JP3407866B2 - Air conditioner - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigeration cycle apparatus connected by piping via a four-way valve, and more particularly to an air conditioner.

[0002]

2. Description of the Related Art A conventional general air conditioner capable of cooling and heating is provided with a four-way valve in a refrigeration cycle, and the cooling operation and the heating operation are performed by switching the four-way valve. On the other hand, a refrigeration cycle capable of performing a cooling operation and a heating operation without using a four-way valve has been proposed in the past. For example, in JP-A-54-89353, 1
A refrigeration cycle has been proposed which can switch between a cooling operation and a heating operation by using three three-way valves and two opening / closing valves. The publication also proposes that a three-way valve can be used instead of the two on-off valves. Further, Japanese Patent Application Laid-Open No. 58-193058 proposes a refrigeration cycle capable of switching between cooling operation and heating operation by using four opening / closing valves. Regarding the refrigeration cycle in which the cooling operation and the heating operation can be switched using two three-way valves, see Japanese Patent Laid-Open No. 57-15076.
It is also proposed in Japanese Patent No. 3 publication.

[0003]

In the conventional four-way valve generally used, since a high-temperature high-pressure refrigerant gas and a low-temperature low-pressure refrigerant gas flow in one valve body, Heat exchange is performed through the valve body, resulting in a large heat loss. On the other hand, as proposed in the past, according to the method of combining a plurality of on-off valves and three-way valves without using a four-way valve, the above-mentioned heat loss does not occur, but existing two-way valves and three-way valves The valve has a problem that the pressure loss is larger than that of the four-way valve due to its structure. Therefore, it is important to reduce heat loss generated inside the four-way valve while using the four-way valve.

It should be noted that, while using a four-way valve, the heat loss generated inside the four-way valve is reduced as disclosed in JP-A-56-6.
There is No. 6660. This is to provide the refrigerant discharged from the compressor to the outdoor heat exchanger without passing through the four-way valve during the cooling operation by providing a three-way valve between the discharge side of the compressor and the four-way valve. . However, in general, the three-way valve has a larger pressure loss than the on-off valve (two-way valve) due to its structure. The difference in the basic structure between the three-way valve and the two-way valve will be briefly described below with reference to FIGS. 18 to 20. As shown in FIGS. 18 and 19, the three-way valve 500 is
It has one inflow pipe 501 and two outflow pipes 502 and 503. A slide valve 504 provided inside selectively switches one outflow pipe 502 and the other outflow pipe 503. In FIG. 18, the slide valve 504 is moved rightward so that the inflow pipe 501 and the outflow pipe 503 communicate with each other, and the flow from arrow A to arrow B is formed. Further, in FIG. 19, the slide valve 504 is moved leftward so that the inflow pipe 501 and the outflow pipe 502 are communicated with each other, and the flow from the arrow A to the arrow C is formed. On the other hand, as shown in FIG. 20, the two-way valve 600 includes one inflow pipe 601 and one outflow pipe 602. A slide valve 603 provided inside opens and closes the outflow pipe 602. Figure 20
Slides the slide valve 504 to the left to move the inflow pipe 6
01 and the outflow pipe 602 are communicated with each other to form a flow from arrow A to arrow C. As mentioned above, the three-way valve 500
A large pressure loss will occur when flowing from the arrow A to the arrow B. Further, as disclosed in Japanese Patent Laid-Open No. 56-66660, when the high pressure side passage of the four-way valve is shut off and used, the refrigerant remaining in the high pressure side passage is changed by the refrigerant flowing in the low pressure side passage. As a result, the liquid refrigerant may be cooled, and as a result, the liquid refrigerant may accumulate in the high pressure side passage in the four-way valve. As described above, when the liquid refrigerant stays in the four-way valve, when switching the four-way valve, a disadvantage such as a delay in the opening / closing operation of the valve or a damage to the valve body occurs.

Therefore, the present invention provides a refrigeration cycle apparatus, particularly an air conditioner, which uses a four-way valve and reduces pressure loss in the refrigeration cycle to reduce the problem of heat loss of the four-way valve. To aim. Further, the present invention eliminates the state in which the liquid refrigerant stays in the four-way valve, and can eliminate the inconvenience such as delay in the opening / closing operation of the four-way valve and the inconvenience that the valve body is damaged, particularly an air conditioner. The purpose is to provide.

[0006]

Means for Solving the Problems An air conditioning apparatus of the present invention according to claim 1, the compressor, the indoor heat exchanger, expansion device, and a refrigeration cycle connected by piping to the outdoor heat exchanger through the four-way valve An air conditioner having: a bypass pipe provided in parallel with a refrigerant passage communicating between the indoor heat exchanger, which is one of the refrigerant passages of the four-way valve, and the suction port of the compressor, and a cooling operation. sometimes, to flow the refrigerant in the bypass pipe, before
When flowing the refrigerant through the bypass pipe,
Refrigerant is introduced into the refrigerant passage of the four-way valve in parallel with the Y-pass pipe.
It is characterized by not flowing . The claim 2 air conditioning apparatus of the present invention described, the compressor, the indoor heat exchanger, expansion device, and an outdoor heat exchanger an air conditioner having a refrigerating cycle connected by piping via a four-way valve, Among the refrigerant passages of the four-way valve, a refrigerant passage that connects the discharge port of the compressor and the outdoor heat exchanger, and a refrigerant passage that connects the indoor heat exchanger and the suction port of the compressor in parallel. each a bypass tube, during the cooling operation, two to flow the refrigerant in the bypass pipe, when the refrigerant flows into the two said bypass pipe
Is in parallel with the bypass pipe for flowing the refrigerant,
It is characterized in that the refrigerant does not flow in the refrigerant passage of the four-way valve .
The claim 3 air conditioner of the present invention described, the compressor, the indoor heat exchanger, expansion device, and an outdoor heat exchanger an air conditioner having a refrigerating cycle connected by piping via a four-way valve, A bypass pipe is provided in parallel with a refrigerant passage communicating between the outdoor heat exchanger, which is one of the refrigerant passages of the four-way valve, and the suction port of the compressor, and an opening / closing valve is provided in the bypass pipe to perform a heating operation. sometimes, the open close valve to flow the refrigerant in the bypass pipe, when the refrigerant flows into the bypass pipe
Is the four pipes that are in parallel with the bypass pipe through which the refrigerant flows.
It is characterized in that the refrigerant does not flow into the refrigerant passage of the one-way valve . The claim 4 air conditioning apparatus of the present invention described, the compressor, the indoor heat exchanger, expansion device, and an outdoor heat exchanger an air conditioner having a refrigerating cycle connected by piping via a four-way valve, Among the refrigerant passages of the four-way valve, a refrigerant passage that connects the discharge port of the compressor and the indoor heat exchanger, and a refrigerant passage that connects the outdoor heat exchanger and the suction port of the compressor in parallel. Each has a bypass pipe, and during heating operation,
To flow the refrigerant into two of the bypass pipe, two of the bypass
When the refrigerant flows through the bypass pipe, the bypass pipe through which the refrigerant flows
Do not flow the refrigerant into the refrigerant passage of the four-way valve that is in parallel with
And wherein the decoction. The air conditioning of the present invention according to claim 5.
The apparatus is an air conditioner having a refrigeration cycle in which a compressor, an indoor heat exchanger, a throttle device, and an outdoor heat exchanger are connected by piping via a four-way valve, and among the refrigerant passages of the four-way valve, A first bypass pipe is provided in parallel with a refrigerant passage communicating between the outdoor heat exchanger and the suction port of the compressor, and a first bypass pipe is provided in parallel with the refrigerant passage communicating between the indoor heat exchanger and the suction port of the compressor. Two bypass pipes are provided, and the refrigerant is caused to flow through the second bypass pipe during the cooling operation, and the refrigerant is caused to flow through the first bypass pipe during the heating operation. Claim
The air conditioner of the present invention according to 6 is an air conditioner having a refrigeration cycle in which a compressor, an indoor heat exchanger, a throttle device, and an outdoor heat exchanger are connected by piping via a four-way valve, First of the refrigerant passages of the valve are arranged in parallel with the refrigerant passages that connect the discharge port of the compressor and the outdoor heat exchanger.
A bypass pipe is provided, a second bypass pipe is provided in parallel with a refrigerant passage that communicates the outdoor heat exchanger with the suction port of the compressor, and a first opening / closing valve is provided in the first bypass pipe. A second opening / closing valve is provided in the second bypass pipe, and during the cooling operation, the first opening / closing valve is opened and the second opening / closing valve is closed to allow the refrigerant to flow into the first bypass pipe, and during the heating operation. ,
It is characterized in that the first on-off valve is closed and the second on-off valve is opened to allow the refrigerant to flow through the second bypass pipe. The air conditioner of the present invention according to claim 7 is an air conditioner having a refrigeration cycle in which a compressor, an indoor heat exchanger, a throttle device, and an outdoor heat exchanger are connected by piping via a four-way valve, In the refrigerant passage of the four-way valve, a first bypass pipe is provided in parallel with a refrigerant passage that connects the discharge port of the compressor and the indoor heat exchanger, and the intake port of the indoor heat exchanger and the compressor. A second bypass pipe is provided in parallel with a refrigerant passage that communicates with the first bypass pipe, the second bypass pipe is made to flow the refrigerant during the cooling operation, and the first bypass pipe is made to flow the refrigerant during the heating operation. To do. An air conditioner of the present invention according to claim 8 is an air conditioner having a refrigeration cycle in which a compressor, an indoor heat exchanger, a throttle device, and an outdoor heat exchanger are connected by piping via a four-way valve, A bypass pipe is provided in each of the refrigerant passages of the four-way valve, and a bypass pipe provided in parallel with a refrigerant passage that communicates the discharge port of the compressor with the outdoor heat exchanger during cooling operation, and the indoor heat exchanger. A refrigerant flow in a bypass pipe provided in parallel with a refrigerant passage that communicates with the suction port of the compressor, and during heating operation, in parallel with a refrigerant passage that communicates the discharge port of the compressor with the indoor heat exchanger. Refrigerant is caused to flow through the provided bypass pipe and the bypass pipe provided in parallel with the refrigerant passage that connects the outdoor heat exchanger and the suction port of the compressor. The present invention according to claim 9 relates to claim 1, claim 2, claim 4, claim 5, and contract.
In the air conditioner according to claim 7 or claim 8 ,
An opening / closing valve is provided in each of the bypass pipes. The present invention according to claim 10 relates to claim 3,
In the air conditioner according to claim 6 or 9 , an expansion valve is used as the opening / closing valve. The present invention of claim 11 wherein from claim 5
The air conditioner according to claim 7 , wherein when the refrigerant flows through the bypass pipe, the refrigerant does not flow through the refrigerant passage of the four-way valve that is in parallel with the bypass pipe through which the refrigerant flows. . The refrigeration cycle apparatus of the present invention according to claim 12, wherein the refrigeration cycle apparatus is connected by piping via a four-way valve, and a bypass pipe is provided in parallel with at least one refrigerant passage of the refrigerant passages of the four-way valve. An opening / closing valve is provided in the bypass pipe, and a refrigerant flow in the bypass pipe is controlled by opening / closing the opening / closing valve.
The gas pipe is parallel to the refrigerant passage of the four-way valve in which the low temperature side refrigerant flows.
When the refrigerant is provided in a row and the refrigerant flows through the bypass pipe,
Cooling the four-way valve in parallel with the bypass pipe.
It is characterized in that the refrigerant does not flow in the medium passage . Claim 13
In the refrigeration cycle apparatus according to claim 12 , the present invention described is characterized in that an expansion valve is used as the opening / closing valve. According to a fourteenth aspect of the present invention, in the refrigeration cycle apparatus according to the twelfth aspect , the bypass pipe is provided in parallel with the refrigerant passage of the four-way valve through which the high temperature side refrigerant flows. The present invention according to claim 15 is a contract
In the refrigeration cycle apparatus according to Motomeko 12, characterized by blocking the flow of the refrigerant by using the check valve.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The first embodiment of the present invention bypasses a refrigerant passage communicating between an indoor heat exchanger, which is one of the refrigerant passages of a four-way valve, and a suction port of a compressor in parallel. A pipe is provided to allow refrigerant to flow through this bypass pipe during cooling operation.
However, when the refrigerant flows through the bypass pipe, the refrigerant flows.
Refrigerant passage of the four-way valve in parallel with the bypass pipe
The refrigerant does not flow through . According to this embodiment,
It is possible to reduce the temperature rise of the refrigerant sucked into the compressor due to the refrigerant discharged from the compressor during the cooling operation, and on the suction side, the refrigerant flows through the bypass pipe in addition to the refrigerant passage, which particularly improves the cooling performance. It is possible to greatly reduce the pressure loss, which is a factor that reduces the pressure loss. Also, let the refrigerant flow
Refrigerant in the four-way valve refrigerant passage in parallel with the bypass pipe.
More surely prevents heat loss by not flowing
be able to.

In the second embodiment of the present invention, among the refrigerant passages of the four-way valve, a refrigerant passage communicating the discharge port of the compressor with the outdoor heat exchanger, and an inlet port of the indoor heat exchanger and the compressor. DOO each bypass pipe provided in parallel with the refrigerant passage communicating, at the time of cooling operation, when the refrigerant flows to these two refrigerant in the bypass pipe to <br/> stream, two said bypass pipe, cold
Of the four-way valve in parallel with the bypass pipe through which the medium flows
The refrigerant does not flow into the refrigerant passage . According to this embodiment, it is possible to further reduce the temperature rise of the refrigerant sucked into the compressor by the refrigerant discharged from the compressor during the cooling operation, and the refrigerant can flow through the respective bypass pipes in addition to the refrigerant passage. Thus, the pressure loss can be reduced. Well
In addition, the cooling of the four-way valve in parallel with the bypass pipe for flowing the refrigerant
By not flowing the refrigerant in the medium passage, heat loss can be further confirmed.
It can be prevented.

In the third embodiment of the present invention, a bypass pipe is provided in parallel with a refrigerant passage communicating between the outdoor heat exchanger, which is one of the refrigerant passages of the four-way valve, and the suction port of the compressor, the opening and closing valve provided in the bypass pipe, the heating operation, the refrigerant Nagareryu the bypass pipe by opening the closing valve, the by
When the refrigerant is passed through the pass pipe, the bypass for flowing the refrigerant
Flow the refrigerant through the refrigerant passage of the four-way valve in parallel with the pipe.
There is no such thing. According to the present embodiment, the high-temperature refrigerant discharged from the compressor during the heating operation is less likely to be deprived of heat by the low-temperature refrigerant via the four-way valve, so that the condensing capacity in the indoor heat exchanger is reduced. The low-temperature refrigerant that is sucked into the compressor during the heating operation is rarely given heat from the high-temperature refrigerant through the four-way valve, and therefore the compression efficiency is less likely to decrease. Further, according to the present embodiment, since the refrigerant passage on the high pressure side of the four-way valve is not blocked, the liquid refrigerant does not stay in the four-way valve. Also cold
Refrigerant passage of four-way valve in parallel with bypass pipe for flowing medium
By preventing the flow of refrigerant into the
You can stop.

In the fourth embodiment of the present invention, among the refrigerant passages of the four-way valve, a refrigerant passage communicating the discharge port of the compressor with the outdoor heat exchanger, and an intake port of the indoor heat exchanger and the compressor. DOO each bypass pipe provided in parallel with the refrigerant passage communicating, at the time of heating operation, when the refrigerant flows to these two refrigerant in the bypass pipe to <br/> stream, two said bypass pipe, cold
Of the four-way valve in parallel with the bypass pipe through which the medium flows
By not letting the refrigerant flow in the refrigerant passage, the high temperature refrigerant discharged from the compressor during heating operation is less likely to be deprived of heat by the low temperature refrigerant through the four-way valve. The capacity is further reduced, and the low-temperature refrigerant sucked into the compressor during the heating operation is less likely to be given heat from the high-temperature refrigerant through the four-way valve, which may lower the compression efficiency. Even less. Well
In addition, the cooling of the four-way valve in parallel with the bypass pipe for flowing the refrigerant
By not flowing the refrigerant in the medium passage, heat loss can be further confirmed.
It can be prevented.

In the fifth embodiment of the present invention, among the refrigerant passages of the four-way valve, a refrigerant passage communicating between the outdoor heat exchanger and the suction port of the compressor, and the indoor heat exchanger and the suction port of the compressor. Bypass pipes are provided in parallel with the refrigerant passages that communicate with each other. Then, during the cooling operation, by flowing the refrigerant through the bypass pipe provided in parallel with the refrigerant passage that communicates the indoor heat exchanger and the suction port of the compressor, during the cooling operation to the compressor by the refrigerant discharged from the compressor. The temperature rise of the suctioned refrigerant can be reduced, and the pressure loss, which is a factor that significantly reduces the cooling performance, can be reduced because the refrigerant flows through the bypass pipe in addition to the refrigerant passage. Also, during the heating operation, by flowing the refrigerant through the bypass pipe provided in parallel with the refrigerant passage that connects the outdoor heat exchanger and the suction port of the compressor, the high temperature refrigerant discharged from the compressor during the heating operation is Since the low-temperature refrigerant is less likely to absorb heat through the valve, the condensing capacity in the indoor heat exchanger is less likely to decrease, and the low-temperature refrigerant sucked into the compressor during heating operation uses a four-way valve. Since the heat from the high-temperature refrigerant is less likely to be passed through, the compression efficiency is less likely to decrease.

In a sixth embodiment of the present invention, a first bypass pipe is provided in parallel with a refrigerant passage communicating the discharge port of the compressor and the outdoor heat exchanger in the refrigerant passage of the four-way valve,
A second bypass pipe is provided in parallel with the refrigerant passage communicating between the outdoor heat exchanger and the suction port of the compressor, and the first bypass pipe has a first opening / closing valve and the second bypass pipe has a second opening / closing valve. It is equipped with a valve. Then, during the cooling operation, the first opening / closing valve is opened and the second opening / closing valve is closed to allow the refrigerant to flow through the first bypass pipe. During the heating operation, the first opening / closing valve is closed and the second opening / closing valve is opened. When opened, the refrigerant flows through the second bypass pipe. According to the present embodiment, it is possible to reduce the temperature rise of the refrigerant sucked into the compressor due to the refrigerant discharged from the compressor during the cooling operation, and the refrigerant flows through the bypass pipe in addition to the refrigerant passage, and the open / close valve is also provided. The pressure loss can be reduced by controlling by. Further, according to the present embodiment, the high-temperature refrigerant discharged from the compressor during the heating operation is
Since heat is less likely to be taken by the low-temperature refrigerant through the four-way valve, the condensation capacity in the indoor heat exchanger is less likely to decrease, and the low-temperature refrigerant drawn into the compressor during heating operation is Since the heat from the high-temperature refrigerant is less likely to be given via the, the compression efficiency is less likely to decrease. Further, according to the present embodiment, since the refrigerant passage on the high pressure side of the four-way valve is not blocked, the liquid refrigerant does not stay in the four-way valve.

In a seventh embodiment of the present invention, a first bypass pipe is provided in parallel with a refrigerant passage communicating the discharge port of the compressor and the indoor heat exchanger in the refrigerant passage of the four-way valve,
A second bypass pipe is provided in parallel with the refrigerant passage that connects the indoor heat exchanger and the suction port of the compressor, and the refrigerant is caused to flow through the second bypass pipe during the cooling operation and the first bypass pipe during the heating operation. The refrigerant is passed through. According to this embodiment,
It is possible to reduce the temperature rise of the refrigerant sucked into the compressor due to the refrigerant discharged from the compressor during the cooling operation, and on the suction side, the refrigerant flows through the bypass pipe in addition to the refrigerant passage, which particularly improves the cooling performance. It is possible to greatly reduce the pressure loss, which is a factor that reduces the pressure loss. Further, according to the present embodiment, the high-temperature refrigerant discharged from the compressor during the heating operation is less likely to be deprived of heat by the low-temperature refrigerant via the four-way valve, so that the condensing capacity in the indoor heat exchanger is improved. The low-temperature refrigerant is less likely to be reduced, and the low-temperature refrigerant sucked into the compressor during the heating operation is less likely to be given heat from the high-temperature refrigerant via the four-way valve, so that the compression efficiency is less likely to decrease.

In the eighth embodiment of the present invention, a bypass pipe is provided in each of the refrigerant passages of the four-way valve. Then, during the cooling operation, a bypass pipe provided in parallel with the refrigerant passage communicating the discharge port of the compressor and the outdoor heat exchanger, and a refrigerant passage communicating with the suction port of the compressor in parallel with the indoor heat exchanger. By flowing the refrigerant through the provided bypass pipe, it is possible to further reduce the temperature rise of the refrigerant sucked into the compressor due to the refrigerant discharged from the compressor during the cooling operation, and the refrigerant flows through the bypass pipe in addition to the refrigerant passage. Therefore, the pressure loss can be further reduced. Further, during the heating operation, a bypass pipe provided in parallel with the refrigerant passage communicating between the discharge port of the compressor and the indoor heat exchanger, and a refrigerant passage communicating between the outdoor heat exchanger and the suction port of the compressor are provided in parallel. Since the high-temperature refrigerant discharged from the compressor during the heating operation is less deprived of heat by the low-temperature refrigerant through the four-way valve, the refrigerant in the indoor heat exchanger is less likely to flow. The condensing capacity is not further reduced, and the low temperature refrigerant sucked into the compressor during the heating operation is less likely to be given heat from the high temperature refrigerant via the four-way valve.
It is less likely to reduce the compression efficiency.

The ninth embodiment of the present invention is the same as the first, second, fourth, fifth , seventh or eighth embodiment, in which each bypass pipe is provided with an opening / closing valve.
Refrigerant can flow through the bypass pipe depending on the operating state,
The optimum and efficient operation can always be performed. In addition, pressure loss can be reduced by controlling with an on-off valve.

The tenth embodiment of the present invention is the tenth embodiment.
In the third , sixth , and ninth embodiments, as the on-off valve,
By using the expansion valve, it is sufficient to input only when the opening / closing operation is performed, and power consumption can be reduced.

The eleventh embodiment of the present invention is the eleventh embodiment.
In any one of the fifth to seventh embodiments, when the refrigerant flows through the bypass pipe, the refrigerant does not flow through the refrigerant passage of the four-way valve in parallel with the bypass pipe through which the refrigerant flows, so that the pressure in the four-way valve is reduced. The loss is greatly reduced, and the heat loss can be almost eliminated through the four-way valve.

The twelfth embodiment of the present invention is a refrigeration cycle apparatus in which a four-way valve is connected by a pipe, and a bypass pipe is provided in parallel with at least one refrigerant passage of the four-way valve. The bypass pipe is provided with an opening / closing valve, and the opening / closing of the opening / closing valve controls the flow of the refrigerant in the bypass pipe.
It is installed in parallel with the refrigerant passage of the valve, and the refrigerant flows through the bypass pipe.
At this time, the refrigerant is not allowed to flow in the refrigerant passage of the four-way valve which is in parallel with the bypass pipe through which the refrigerant is allowed to flow, so that heat loss can be reduced in any operating state and control is performed by using an on-off valve. By doing so, the pressure loss can be reduced. Further, according to the present embodiment,
Since the refrigerant passage on the high pressure side of the four-way valve is not blocked, the liquid refrigerant does not stay in the four-way valve. Also a bypass pipe
Is installed in parallel with the refrigerant passage of the four-way valve through which the low temperature side refrigerant flows.
Prevents the temperature of the refrigerant on the high temperature side from decreasing,
It is possible to prevent the temperature of the warm-side refrigerant from rising. Also,
The four-way valve's refrigerant passage in parallel with the bypass pipe for flowing the refrigerant.
More reliable heat loss by not flowing refrigerant into the path
Can be prevented.

The thirteenth embodiment of the present invention is the thirteenth embodiment.
In the twelfth embodiment, by using the expansion valve as the opening / closing valve, it is necessary to input only when the opening / closing operation is performed, and the power consumption can be reduced.

The fourteenth embodiment of the present invention is the
In the twelfth embodiment, the bypass pipe is provided in parallel with the refrigerant passage of the four-way valve through which the high temperature side refrigerant flows so as to prevent the temperature of the high temperature side refrigerant from decreasing and prevent the low temperature side refrigerant from increasing in temperature. You can

The fifteenth embodiment of the present invention is a fifteenth embodiment.
In the twelfth embodiment, a check valve is used to block the flow of the refrigerant. According to the present embodiment, by shutting off the refrigerant passage in the four-way valve by using the check valve, the electrical protection control function is activated at the abnormal time when the high pressure side pipe of the compressor is blocked. Even if it does not, damage to the compressor can be prevented by breaking the check valve.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An air conditioner according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a refrigeration cycle diagram of the air conditioner for explaining the first embodiment. As shown in the figure, the compressor 10, the four-way valve 20, the outdoor heat exchanger 30, the expansion device 40, and the indoor heat exchanger 50 are annularly connected via pipes. Here, the compressor 10,
The four-way valve 20, the outdoor heat exchanger 30, and the expansion device 40 are provided in the outdoor unit A, and the indoor heat exchanger 50 is provided in the indoor unit B.

The outdoor unit A and the indoor unit B are connected to the liquid side connecting pipe 6
1C and the gas side connection pipe 62C are connected. The liquid side connection pipe 61C is connected by a liquid side outdoor valve 81 and a liquid side indoor valve 82, and the gas side connection pipe 62C is connected by a gas side outdoor valve 83 and a gas side indoor valve 84. The liquid side pipe 61A connects the outdoor heat exchanger 30 and the expansion device 40, and the liquid side pipe 61B connects the expansion device 40 and the liquid side outdoor valve 81. The gas side pipe 62A connects the four-way valve 20 and the outdoor heat exchanger 30, the gas side pipe 62B connects the four-way valve 20 and the gas side outdoor valve 83, and the gas side pipe 62D is the compressor 1
Connect the discharge port of 0 and the four-way valve 20, and connect the gas side pipe 62E.
Connects the four-way valve 20 and the suction port of the compressor 10. In addition, the accumulator 70 is provided in the gas side pipe 62E.
Are connected. The four-way valve 20 has a refrigerant passage 21, which connects the discharge port of the compressor 10 and the outdoor heat exchanger 30,
A refrigerant passage 22 that communicates the discharge port of the compressor 10 with the indoor heat exchanger 50, a refrigerant passage 23 that communicates the outdoor heat exchanger 30 with the suction port of the compressor 10, the indoor heat exchanger 50 and the compressor 1
And a refrigerant passage 24 communicating with the suction port of 0.

As shown in the figure, the bypass pipe 91A is
One end is connected to the gas side pipe 62D and the other end is connected to the gas side pipe 62A. This bypass pipe 91A has an opening / closing valve 91
B is provided. Further, a check valve 91C that blocks the flow of the refrigerant from the four-way valve 20 is provided between the connection portion of the bypass pipe 91A with the gas side pipe 62A and the four-way valve 20.

The switching between the cooling operation and the heating operation is performed by switching the four-way valve 20 to change the flow of the refrigerant. The four-way valve 20 has a refrigerant passage 21 during cooling operation.
And the refrigerant passage 24 are in communication with each other, and the refrigerant passage 22 and the refrigerant passage 23 are in communication during the heating operation. In the figure,
The arrow shown by the solid line indicates the flow direction of the refrigerant during the cooling operation,
The arrow indicated by the broken line indicates the flow direction of the refrigerant during the heating operation.
During the cooling operation, the outdoor heat exchanger 30 functions as a condenser and the indoor heat exchanger 50 functions as an evaporator. Further, during the heating operation, the indoor heat exchanger 50 functions as a condenser and the outdoor heat exchanger 30 functions as an evaporator.

The flow of the refrigerant will be described below. First, the refrigerant flow in the cooling operation will be described. The open / close valve 91B is opened during the cooling operation. Therefore, the high-temperature and high-pressure refrigerant compressed by the compressor 10 is bypass pipe 91A.
And is guided to the outdoor heat exchanger 30. At this time, the check valve 91C blocks the refrigerant flow from the four-way valve 20 to the outdoor heat exchanger 30, so that the refrigerant does not flow into the refrigerant passage 21. The refrigerant condensed in the outdoor heat exchanger 30 is
The pressure is reduced by the expansion device 40 through the liquid side pipe 61A, and is guided to the indoor heat exchanger 50 through the liquid side pipe 61B and the liquid side connection pipe 61C. The refrigerant evaporated in the indoor heat exchanger 50 is sucked into the suction port of the compressor 10 through the gas side connecting pipe 62C, the gas side pipe 62B, the refrigerant passage 24 of the four-way valve 20, and the gas side pipe 62E.

Next, the refrigerant flow in the heating operation will be described. During the heating operation, the on-off valve 91B is closed. Therefore, the high-temperature and high-pressure refrigerant compressed by the compressor 10 is guided to the indoor heat exchanger 50 through the refrigerant passage 22 of the four-way valve 20, the gas side pipe 62B, and the gas side connecting pipe 62C. The refrigerant condensed in the indoor heat exchanger 50 is guided to the expansion device 40 through the liquid side connection pipe 61C and the liquid side pipe 61B. Then, the refrigerant decompressed by the expansion device 40 is guided to the outdoor heat exchanger 30 through the liquid side pipe 61A.
The refrigerant evaporated in the outdoor heat exchanger 30 is connected to the gas side pipe 6
2A, the check valve 91C, and the refrigerant passage 23 of the four-way valve 20 to be sucked into the suction port of the compressor 10.

In this embodiment, as is clear from the above description, the high-temperature refrigerant discharged from the compressor 10 during the cooling operation flows through the bypass pipe 91A and the refrigerant passage 21 in the four-way valve 20. There is no. Therefore, the high-temperature refrigerant discharged from the compressor 10 during the cooling operation does not give heat to the low-temperature refrigerant flowing through the four-way valve 20 on the refrigerant passage 24 side, so that the compression efficiency is not reduced.

In this embodiment, the check valve 91C is used to prevent the refrigerant from flowing through the refrigerant passage 21 of the four-way valve 20. However, the check valve 91C is not provided and the refrigerant passage 21 is opened. You may comprise so that a refrigerant may flow. In this case, the high-temperature refrigerant discharged from the compressor 10 during the cooling operation gives heat to the low-temperature refrigerant flowing through the four-way valve 20 on the refrigerant passage 24 side, but the bypass pipe 9
Compared with the case where 1A is not used, the temperature rise of the suctioned refrigerant is small, and since the refrigerant flows through the bypass pipe 91A in addition to the refrigerant passage 21, the pressure loss can be reduced and the refrigerant passage can be blocked. It is possible to prevent the generated liquid refrigerant from accumulating. As the opening / closing valve 91B, an expansion valve can be used instead of an electromagnetic valve. In the case of using the expansion valve, unlike the solenoid valve, it is not necessary to always input at the time of any opening / closing operation, and it is sufficient to input only at the time of opening / closing operation, so that power consumption can be reduced. Further, as the opening / closing valve 91B in the present embodiment, a three-way valve or the like may be used at the connecting portion of the bypass pipe 91A with the gas side pipe 62A or the gas side pipe 62D. Further, the four-way valve 2 can be used without using the check valve 91C.
The 0 refrigerant passage 21 may be closed so that the refrigerant does not flow.

Next, an air conditioner according to another embodiment of the present invention will be described with reference to FIG. The members having the same functions as those of the embodiment shown in FIG. In the embodiment shown in FIG. 2, instead of the bypass pipe 91A, the opening / closing valve 91B and the check valve 91C shown in FIG.
A bypass pipe 92A, an opening / closing valve 92B, and a check valve 92C are provided.

As shown in the figure, the bypass pipe 92A is
One end is connected to the gas side pipe 62B and the other end is connected to the gas side pipe 62E. The bypass valve 92A has an opening / closing valve 92
B is provided. Further, a check valve 92C that blocks a refrigerant flow to the four-way valve 20 is provided between the connection portion of the bypass pipe 92A with the gas side pipe 62B and the four-way valve 20.

The flow of the refrigerant will be described below. First, the refrigerant flow in the cooling operation will be described. The opening / closing valve 92B is opened during the cooling operation. The high-temperature and high-pressure refrigerant compressed by the compressor 10 is transferred to the refrigerant passage 2 of the four-way valve 20.
1. Flowing through the gas side pipe 62A, it is guided to the outdoor heat exchanger 30. Then, the refrigerant condensed in the outdoor heat exchanger 30 is decompressed by the expansion device 40 through the liquid side pipe 61A, passes through the liquid side pipe 61B and the liquid side connection pipe 61C, and the indoor heat exchanger 50.
Be led to. The refrigerant evaporated in the indoor heat exchanger 50 is
It is sucked into the suction port of the compressor 10 through the gas side connection pipe 62C, the gas side pipe 62B, the bypass pipe 92A, and the gas side pipe 62E. At this time, the check valve 92C blocks the refrigerant flow from the gas side pipe 62B to the four-way valve 20, so that the refrigerant does not flow in the refrigerant passage 24.

Next, the refrigerant flow in the heating operation will be described. During the heating operation, the open / close valve 92B is closed. Therefore, the high-temperature and high-pressure refrigerant compressed by the compressor 10 is guided to the indoor heat exchanger 50 through the refrigerant passage 22 of the four-way valve 20, the check valve 92C, the gas side pipe 62B, and the gas side connecting pipe 62C. The refrigerant condensed in the indoor heat exchanger 50 is guided to the expansion device 40 through the liquid side connection pipe 61C and the liquid side pipe 61B. Then, the refrigerant decompressed by the expansion device 40 passes through the liquid-side pipe 61A, and the outdoor heat exchanger 3
Lead to zero. The refrigerant evaporated in the outdoor heat exchanger 30 is sucked into the suction port of the compressor 10 through the gas side pipe 62A, the refrigerant passage 23 of the four-way valve 20, and the gas side pipe 62E.

In this embodiment, as is clear from the above description, the low-temperature refrigerant sucked into the compressor 10 during the cooling operation flows through the bypass pipe 92A and the refrigerant passage 24 in the four-way valve 20. There is no. Therefore, the low-temperature refrigerant sucked into the compressor 10 during the cooling operation is not given heat from the high-temperature refrigerant flowing in the refrigerant passage 21 side through the four-way valve 20, and therefore the compression efficiency is not reduced. .

In this embodiment, the check valve 92C is used to prevent the refrigerant from flowing through the refrigerant passage 24 of the four-way valve 20. However, the check valve 92C is not provided and the refrigerant passage 24 is opened. You may comprise so that a refrigerant may flow. In this case, the high-temperature refrigerant discharged from the compressor 10 during the cooling operation gives heat to the low-temperature refrigerant flowing through the four-way valve 20 on the refrigerant passage 24 side, but the bypass pipe 9
Compared with the case where 2A is not used, the temperature rise of the suction refrigerant is small, and on the suction side, the refrigerant flows through the bypass pipe 92A in addition to the refrigerant passage 24, so that the pressure loss, which is a factor that greatly reduces the cooling performance, is reduced. It can be greatly reduced. As the opening / closing valve 92B, an expansion valve can be used instead of the electromagnetic valve, as in the above embodiment.
Further, as the opening / closing valve 92B in the present embodiment, a three-way valve or the like may be used at the connecting portion of the bypass pipe 92A with the gas side pipe 62B or the gas side pipe 62E. Further, the refrigerant passage 24 of the four-way valve 20 may be closed so that the refrigerant does not flow without using the check valve 92C.

Next, an air conditioner according to another embodiment of the present invention will be described with reference to FIG. It should be noted that the members having the same functions as those in the above-mentioned respective embodiments are designated by the same reference numerals and the description thereof will be omitted. The embodiment shown in FIG. 3 is provided with a bypass pipe 92A, an opening / closing valve 92B and a check valve 92C shown in FIG. 2 in addition to the bypass pipe 91A, the opening / closing valve 91B and the check valve 91C shown in FIG. .

The flow of the refrigerant will be described below. First, the refrigerant flow in the cooling operation will be described. During the cooling operation, the open / close valve 91B and the open / close valve 92B are opened. Therefore, the high-temperature and high-pressure refrigerant compressed by the compressor 10 flows through the bypass pipe 91A and the gas side pipe 62A and is guided to the outdoor heat exchanger 30. At this time, the check valve 91C blocks the refrigerant flow from the four-way valve 20 to the outdoor heat exchanger 30, so that the refrigerant does not flow into the refrigerant passage 21. The refrigerant condensed in the outdoor heat exchanger 30 is connected to the liquid side pipe 61.
The pressure is reduced by the expansion device 40 through A, and the liquid side pipe 61B,
It is guided to the indoor heat exchanger 50 through the liquid side connection pipe 61C. The refrigerant evaporated in the indoor heat exchanger 50 has a gas side connecting pipe 62C, a gas side pipe 62B, a bypass pipe 92A,
It is sucked into the suction port of the compressor 10 through the gas side pipe 62E. At this time, by the check valve 92C, the gas side pipe 6
Since the refrigerant flow from 2B to the four-way valve 20 is blocked, the refrigerant does not flow in the refrigerant passage 24. Since the on-off valve 91B and the on-off valve 92B are closed during the heating operation, the refrigerant flow is the same as that of the embodiment shown in FIGS. 1 and 2.

In this embodiment, as is clear from the above description, the high temperature refrigerant discharged from the compressor 10 during the cooling operation flows through the bypass pipe 91A and the refrigerant passage 21 in the four-way valve 20. In addition, the low temperature refrigerant which is sucked into the compressor 10 flows through the bypass pipe 92A, and the four-way valve 20
It does not pass through the internal refrigerant passage 24. Therefore, the low-temperature refrigerant sucked into the compressor 10 during the cooling operation is not given heat from the high-temperature refrigerant flowing in the refrigerant passage 21 side through the four-way valve 20, and therefore the compression efficiency is not reduced. .

In this embodiment, the check valve 91C and the check valve 92C are used to prevent the refrigerant from flowing through the refrigerant passage 21 and the refrigerant passage 24 of the four-way valve 20.
The refrigerant may flow through either or both of the refrigerant passage 21 and the refrigerant passage 24 without providing either or both of the check valve 91C and the check valve 92C. In this case, the high-temperature refrigerant discharged from the compressor 10 during the cooling operation passes through the four-way valve 20 and the refrigerant passage 2
Although it will give heat to the low temperature refrigerant flowing through the 4 side,
Compared with the case where the bypass pipe 91A and the bypass pipe 92A are not used, the temperature rise of the suction refrigerant is small, and the refrigerant flows through the bypass pipe 91A and the bypass pipe 92A in addition to the refrigerant passage 21 and the refrigerant passage 24, thereby reducing the pressure loss. It is possible to reduce the amount of the liquid refrigerant and prevent the liquid refrigerant from accumulating due to the blocking of the refrigerant passage. As the opening / closing valve 91B, an expansion valve can be used instead of the electromagnetic valve, as in the above embodiment. Further, as the opening / closing valve 91B or the opening / closing valve 92B in this embodiment, a three-way valve or the like may be used as described in the above embodiments. Further, the refrigerant passage 21 and the refrigerant passage 24 of the four-way valve 20 are used without using the check valve 91C and the check valve 92C.
May be closed so that the refrigerant does not flow.

Next, an air conditioner according to another embodiment of the present invention will be described with reference to FIG. The members having the same functions as those in the above embodiment are designated by the same reference numerals and the description thereof will be omitted. The embodiment shown in FIG. 4 is provided with a bypass pipe 93A, an opening / closing valve 93B, and a check valve 93C.

As shown in the figure, the bypass pipe 93A is
One end is connected to the gas side pipe 62B and the other end is connected to the gas side pipe 62D. The bypass valve 93A has an opening / closing valve 93
B is provided. Further, a check valve 93C that blocks the flow of the refrigerant from the four-way valve 20 is provided between the connection portion of the bypass pipe 93A with the gas side pipe 62B and the four-way valve 20.

The flow of the refrigerant will be described below. First, the refrigerant flow in the cooling operation will be described. During the cooling operation, the open / close valve 93B is closed. The high-temperature and high-pressure refrigerant compressed by the compressor 10 is transferred to the refrigerant passage 2 of the four-way valve 20.
1. Flowing through the gas side pipe 62A, it is guided to the outdoor heat exchanger 30. Then, the refrigerant condensed in the outdoor heat exchanger 30 is decompressed by the expansion device 40 through the liquid side pipe 61A, passes through the liquid side pipe 61B and the liquid side connection pipe 61C, and the indoor heat exchanger 50.
Be led to. The refrigerant evaporated in the indoor heat exchanger 50 is
Gas side connection pipe 62C, gas side pipe 62B, check valve 93
C, the refrigerant is passed through the refrigerant passage 24 of the four-way valve 20 and the gas side pipe 62E, and is sucked into the suction port of the compressor 10.

Next, the refrigerant flow in the heating operation will be described. During the heating operation, the open / close valve 93B is opened. Therefore, the high-temperature high-pressure refrigerant compressed by the compressor 10 flows through the bypass pipe 93A, the gas side pipe 62B, and the gas side connecting pipe 62C and is guided to the indoor heat exchanger 50. At this time, the check valve 93C blocks the flow of the refrigerant from the four-way valve 20 to the indoor heat exchanger 50.
Refrigerant does not flow through. The refrigerant condensed in the indoor heat exchanger 50 is guided to the expansion device 40 through the liquid side connection pipe 61C and the liquid side pipe 61B. Then, the refrigerant decompressed by the expansion device 40 is guided to the outdoor heat exchanger 30 through the liquid side pipe 61A. The refrigerant evaporated in the outdoor heat exchanger 30 is sucked into the suction port of the compressor 10 through the gas side pipe 62A, the refrigerant passage 23 of the four-way valve 20, and the gas side pipe 62E.

In this embodiment, as is clear from the above description, the high temperature refrigerant discharged from the compressor 10 during the heating operation flows through the bypass pipe 93A and the refrigerant passage 22 in the four-way valve 20. There is no. Therefore, the high-temperature refrigerant discharged from the compressor 10 during the heating operation is not deprived of heat by the low-temperature refrigerant flowing in the refrigerant passage 21 side through the four-way valve 20, so that the condensation in the indoor heat exchanger 50 is performed. Does not reduce ability. Further, since the low-temperature refrigerant sucked into the compressor 10 during the heating operation is not given heat from the high-temperature refrigerant via the four-way valve 20, the compression efficiency is not lowered.

In this embodiment, the check valve 93C is used to prevent the refrigerant from flowing through the refrigerant passage 22 of the four-way valve 20. However, the check valve 93C is not provided and the refrigerant passage 22 is opened. You may comprise so that a refrigerant may flow. In this case, the high temperature refrigerant discharged from the compressor 10 during the heating operation gives heat to the low temperature refrigerant flowing through the four-way valve 20 on the refrigerant passage 21 side, but the bypass pipe 9
Compared with the case where 3A is not used, the temperature rise of the suction refrigerant and the temperature reduction of the discharge refrigerant are small, and the pressure loss can be reduced while the refrigerant flows through the bypass pipe 93A in addition to the refrigerant passage 22. It is possible to prevent the liquid refrigerant from accumulating by blocking the passage. As the opening / closing valve 93B, an expansion valve can be used as well as the electromagnetic valve, as in the above embodiment. Also,
As the opening / closing valve 93B in this embodiment, the bypass pipe 9 is used.
A three-way valve or the like may be used at the connecting portion with the gas side pipe 62B or the gas side pipe 62D of 3A. Further, the refrigerant passage 22 of the four-way valve 20 can be provided without using the check valve 93C.
May be closed so that the refrigerant does not flow.

Next, an air conditioner according to another embodiment of the present invention will be described with reference to FIG. The members having the same functions as those in the above embodiment are designated by the same reference numerals and the description thereof will be omitted. In the embodiment shown in FIG. 5, a bypass pipe 94A, an opening / closing valve 94B, and a check valve 94C are provided in place of the bypass pipe 93A, the opening / closing valve 93B, and the check valve 93C in FIG.

As shown in the figure, the bypass pipe 94A is
One end is connected to the gas side pipe 62A and the other end is connected to the gas side pipe 62E. The bypass valve 94A has an opening / closing valve 94
B is provided. Further, a check valve 94C for blocking the refrigerant flow to the four-way valve 20 is provided between the connection portion of the bypass pipe 94A with the gas side pipe 62A and the four-way valve 20.

The flow of the refrigerant will be described below. First, the refrigerant flow in the cooling operation will be described. During the cooling operation, the open / close valve 94B is closed. The high-temperature and high-pressure refrigerant compressed by the compressor 10 is transferred to the refrigerant passage 2 of the four-way valve 20.
1. Flowing through the gas side pipe 62A, it is guided to the outdoor heat exchanger 30. Then, the refrigerant condensed in the outdoor heat exchanger 30 is decompressed by the expansion device 40 through the liquid side pipe 61A, passes through the liquid side pipe 61B and the liquid side connection pipe 61C, and the indoor heat exchanger 50.
Be led to. The refrigerant evaporated in the indoor heat exchanger 50 is
Gas side connection pipe 62C, gas side pipe 62B, four-way valve 20
Of the compressor 10 through the refrigerant passage 24 and the gas side pipe 62E of the compressor 10.
Is inhaled into the intake port of.

Next, the refrigerant flow in the heating operation will be described. During the heating operation, the open / close valve 94B is opened. Therefore, the high-temperature high-pressure refrigerant compressed by the compressor 10 flows through the gas side pipe 62D, the refrigerant passage 22 of the four-way valve 20, the gas side pipe 62B, and the gas side connecting pipe 62C and is guided to the indoor heat exchanger 50. The refrigerant condensed in the indoor heat exchanger 50 is guided to the expansion device 40 through the liquid side connection pipe 61C and the liquid side pipe 61B. Then, the refrigerant decompressed by the expansion device 40 is guided to the outdoor heat exchanger 30 through the liquid side pipe 61A. The refrigerant evaporated in the outdoor heat exchanger 30 is sucked into the suction port of the compressor 10 through the gas side pipe 62A, the bypass pipe 94A, and the gas side pipe 62E. At this time, the check valve 94C blocks the refrigerant flow from the gas side pipe 62A to the four-way valve 20, so that the refrigerant passage 2
No refrigerant flows into 3.

In this embodiment, as is clear from the above description, the low-temperature refrigerant sucked into the compressor 10 during the heating operation flows through the bypass pipe 94A and passes through the refrigerant passage 23 in the four-way valve 20. There is no. Therefore, the high-temperature refrigerant discharged from the compressor 10 during the heating operation is not deprived of heat by the low-temperature refrigerant via the four-way valve 20, so that the condensing capacity of the indoor heat exchanger 50 can be reduced. Absent. Further, the low-temperature refrigerant sucked into the compressor 10 during the heating operation is not given heat from the high-temperature refrigerant flowing through the four-way valve 20 on the refrigerant passage 22 side, so that the compression efficiency is not lowered.

In this embodiment, the check valve 94C is used to prevent the refrigerant from flowing through the refrigerant passage 23 of the four-way valve 20. However, the check valve 94C is not provided and the refrigerant passage 23 is opened. You may comprise so that a refrigerant may flow. In this case, the high-temperature refrigerant discharged from the compressor 10 during the heating operation gives heat to the low-temperature refrigerant flowing in the refrigerant passage 23 side through the four-way valve 20, but the bypass pipe 9
Compared with the case where 3A is not used, the temperature rise of the suction refrigerant and the temperature decrease of the discharge refrigerant are small, and the pressure loss can be reduced by the refrigerant flowing through the bypass pipe 94A in addition to the refrigerant passage 23. In addition, as the open / close valve 94B,
Similar to the above-mentioned embodiment, an expansion valve can be used instead of the solenoid valve. Further, as the on-off valve 94B in the present embodiment, a three-way valve or the like may be used at the connecting portion of the bypass pipe 94A with the gas side pipe 62A or the gas side pipe 62E. In addition, the four-way valve 2 can be used without using the check valve 94C.
The refrigerant passage 23 of 0 may be closed so that the refrigerant does not flow.

Next, an air conditioner according to another embodiment of the present invention will be described with reference to FIG. The members having the same functions as those in the above embodiment are designated by the same reference numerals and the description thereof will be omitted. In addition to the bypass pipe 93A, the on-off valve 93B and the check valve 93C shown in FIG. 4, the embodiment shown in FIG.
Bypass pipe 94A, open / close valve 94B, check valve 94C shown in
Is provided.

The flow of the refrigerant will be described below. First, during the cooling operation, the open / close valve 93B and the open / close valve 94B are closed. Therefore, the refrigerant flow in the cooling operation is the same as that in the embodiment shown in FIG. 4 or 5. Next, the refrigerant flow in the heating operation will be described. During the heating operation, the open / close valve 93B and the open / close valve 94B are opened. Therefore, the high-temperature and high-pressure refrigerant compressed by the compressor 10 is bypass pipe 93A, gas side pipe 62B, gas side connecting pipe 62
It flows through C and is guided to the indoor heat exchanger 50. At this time, the check valve 93C causes the four-way valve 20 to move to the indoor heat exchanger 50.
Since the flow of the refrigerant into the refrigerant passage 22 is blocked, the refrigerant does not flow into the refrigerant passage 22. The refrigerant condensed in the indoor heat exchanger 50 is
It is guided to the expansion device 40 through the liquid side connection pipe 61C and the liquid side pipe 61B. Then, the refrigerant decompressed by the expansion device 40 is guided to the outdoor heat exchanger 30 through the liquid side pipe 61A. The refrigerant evaporated in the outdoor heat exchanger 30 is sucked into the suction port of the compressor 10 through the gas side pipe 62A, the bypass pipe 94A, and the gas side pipe 62E. At this time, the check valve 94C is used to connect the four-way valve 20 from the gas side pipe 62A.
Since the flow of the refrigerant into the refrigerant passage 23 is blocked, the refrigerant does not flow into the refrigerant passage 23.

In this embodiment, as is clear from the above description, the high temperature refrigerant discharged from the compressor 10 and the low temperature refrigerant sucked into the compressor 10 during the heating operation are the bypass pipe 93A and the bypass pipe 93A, respectively. Flow through pipe 94A, four-way valve 20
It does not pass through the refrigerant passage 22 and the refrigerant passage 23 therein. Therefore, the high-temperature refrigerant discharged from the compressor 10 during the heating operation is not deprived of heat by the low-temperature refrigerant via the four-way valve 20, so that the condensing capacity of the indoor heat exchanger 50 can be reduced. Absent. Further, since the low-temperature refrigerant sucked into the compressor 10 during the heating operation is not given heat from the high-temperature refrigerant via the four-way valve 20, the compression efficiency is not lowered.

In this embodiment, the check valve 93C and the check valve 94C are used to prevent the refrigerant from flowing through the refrigerant passage 22 and the refrigerant passage 23 of the four-way valve 20.
The refrigerant may flow through either or both of the refrigerant passage 22 and the refrigerant passage 23 without providing either or both of the check valve 93C and the check valve 94C. In this case, the high-temperature refrigerant discharged from the compressor 10 during the heating operation passes through the four-way valve 20 and the refrigerant passage 2
Although it will give heat to the low temperature refrigerant flowing through the 3 side,
Compared with the case where the bypass pipe 93A and the bypass pipe 94A are not used, the temperature rise of the suction refrigerant and the temperature decrease of the discharge refrigerant are less, and the refrigerant flows through the bypass pipe 93A and the bypass pipe 94A in addition to the refrigerant passage 22 and the refrigerant passage 23. Thus, it is possible to reduce the pressure loss and prevent the liquid refrigerant from accumulating due to the blocking of the refrigerant passage. As the opening / closing valve 93B and the opening / closing valve 94B, an expansion valve can be used in addition to the electromagnetic valve, as in the above embodiment. Further, the open / close valve 93 in the present embodiment
As the B and on-off valve 94B, a three-way valve or the like may be used as described above. Further, the refrigerant passage 22 and the refrigerant passage 23 of the four-way valve 20 may be closed so that the refrigerant does not flow without using the check valve 93C and the check valve 94C.

Next, an air conditioner according to another embodiment of the present invention will be described with reference to FIG. The members having the same functions as those in the above embodiment are designated by the same reference numerals and the description thereof will be omitted. In the embodiment shown in FIG. 7, in addition to the bypass pipe 91A, the opening / closing valve 91B and the check valve 91C shown in FIG. 1, a bypass pipe 93A, an opening / closing valve 93B and a check valve 93C shown in FIG. 4 are provided. .

The flow of the refrigerant will be described below. During the cooling operation, the open / close valve 91B is opened and the open / close valve 93B is opened.
Is closed. Therefore, the refrigerant flow in the cooling operation is the same as the refrigerant flow in the embodiment shown in FIG. Also,
During the heating operation, the on-off valve 91B is closed and the on-off valve 9B is closed.
3B is opened. Therefore, the refrigerant flow in the heating operation is the same as that of the embodiment shown in FIG.

In this embodiment, as is clear from the above description, the high temperature refrigerant discharged from the compressor 10 during the cooling operation flows through the bypass pipe 91A and the refrigerant passage 21 in the four-way valve 20. There is no. Therefore, the low-temperature refrigerant sucked into the compressor 10 during the cooling operation is not given heat from the high-temperature refrigerant flowing in the refrigerant passage 21 side through the four-way valve 20, and therefore the compression efficiency is not reduced. . Further, in the present embodiment, the high temperature refrigerant discharged from the compressor 10 during the heating operation flows through the bypass pipe 93A and does not pass through the refrigerant passage 22 inside the four-way valve 20. Therefore, the high-temperature refrigerant discharged from the compressor 10 during the heating operation is not deprived of heat by the low-temperature refrigerant flowing in the refrigerant passage 23 side through the four-way valve 20, so that the condensation in the indoor heat exchanger 50 is performed. Does not reduce ability. Also, during heating operation, the compressor 1
The low-temperature refrigerant sucked into 0 is not given heat from the high-temperature refrigerant via the four-way valve 20, and therefore the compression efficiency is not lowered.

In this embodiment, the check valve 91C and the check valve 93C are used to prevent the refrigerant from flowing through the refrigerant passage 21 and the refrigerant passage 22 of the four-way valve 20.
The refrigerant may flow through either or both of the refrigerant passage 21 and the refrigerant passage 22 without providing either or both of the check valve 91C and the check valve 93C. In this case, the high-temperature refrigerant discharged from the compressor 10 during the cooling operation passes through the four-way valve 20 and the refrigerant passage 2
Although it will give heat to the low temperature refrigerant flowing through the 4 side,
Compared with the case where the bypass pipe 91A is not used, the temperature rise of the suctioned refrigerant is small, and the refrigerant flows through the bypass pipe 91A in addition to the refrigerant passage 21, so that the pressure loss can be reduced. Further, the high-temperature refrigerant discharged from the compressor 10 during the heating operation gives heat to the low-temperature refrigerant flowing through the four-way valve 20 on the refrigerant passage 23 side, but when the bypass pipe 93A is not used. Compared with this, the temperature rise of the intake refrigerant and the temperature decrease of the discharge refrigerant are small, and the refrigerant passage
In addition to 2, the refrigerant flows through the bypass pipe 93A, whereby the pressure loss can be reduced and the retention of the liquid refrigerant caused by blocking the refrigerant passage can be prevented. As the opening / closing valve 91B and the opening / closing valve 93B, an expansion valve can be used as well as the electromagnetic valve, as in the above embodiment. Further, as the opening / closing valve 91B or the opening / closing valve 93B in this embodiment, a three-way valve or the like may be used as described in the above embodiments. Also, the check valve 9
The refrigerant passage 21 and the refrigerant passage 22 of the four-way valve 20 may be closed so that the refrigerant does not flow without using the 1C and the check valve 93C.

Next, an air conditioner according to another embodiment of the present invention will be described with reference to FIG. The members having the same functions as those in the above embodiment are designated by the same reference numerals and the description thereof will be omitted. In the embodiment shown in FIG. 8, the check valve 91 shown in FIG.
Instead of C and the check valve 93C, between the connection portion of the bypass pipe 91A and the gas side pipe 62D, and the connection portion of the bypass pipe 93A and the gas side pipe 62D, and the four-way valve 20, to the four-way valve 20. A check valve 95 for blocking the flow of the refrigerant is provided.

In this embodiment, the flow of the refrigerant and the effects produced by the flow of the refrigerant are the same as in FIG.
According to the present embodiment, the number of check valves can be reduced by one compared with the embodiment of FIG. 7, so that it is suitable for saving space and can be constructed at low cost.

Next, an air conditioner according to another embodiment of the present invention will be described with reference to FIG. The members having the same functions as those in the above embodiment are designated by the same reference numerals and the description thereof will be omitted. The embodiment shown in FIG. 9 is provided with a bypass pipe 94A, an on-off valve 94B and a check valve 94C shown in FIG. 5 in addition to the bypass pipe 92A, the on-off valve 92B and the check valve 92C shown in FIG. .

The flow of the refrigerant will be described below. During the cooling operation, the on-off valve 92B is opened and the on-off valve 94B is opened.
Is closed. Therefore, the refrigerant flow in the cooling operation is the same as the refrigerant flow in the embodiment shown in FIG. Also,
During the heating operation, the on-off valve 92B is closed and the on-off valve 9B is closed.
4B is opened. Therefore, the refrigerant flow in the heating operation is the same as the refrigerant flow in the embodiment shown in FIG.

In this embodiment, as is clear from the above description, the low-temperature refrigerant sucked into the compressor 10 during the cooling operation flows through the bypass pipe 92A and the refrigerant passage 24 in the four-way valve 20. There is no. Therefore, the low-temperature refrigerant sucked into the compressor 10 during the cooling operation is not given heat from the high-temperature refrigerant flowing in the refrigerant passage 21 side through the four-way valve 20, and therefore the compression efficiency is not reduced. . Further, in the present embodiment, the low-temperature refrigerant sucked into the compressor 10 during the heating operation flows through the bypass pipe 94A and does not pass through the refrigerant passage 23 in the four-way valve 20. Therefore, the high-temperature refrigerant discharged from the compressor 10 during the heating operation is the four-way valve 2
Since heat is not taken away by the low-temperature refrigerant through 0,
The condensing capacity of the indoor heat exchanger 50 is not reduced. Further, the low-temperature refrigerant sucked into the compressor 10 during the heating operation is not given heat from the high-temperature refrigerant flowing through the four-way valve 20 on the refrigerant passage 22 side, so that the compression efficiency is not lowered.

In this embodiment, the check valve 92C and the check valve 94C are used to prevent the refrigerant from flowing through the refrigerant passage 24 and the refrigerant passage 23 of the four-way valve 20.
The refrigerant may flow through either or both of the refrigerant passage 24 and the refrigerant passage 23 without providing either or both of the check valve 92C and the check valve 94C. In this case, the low-temperature refrigerant sucked into the compressor 10 during the cooling operation passes through the four-way valve 20 and the refrigerant passage 21.
Although the heat is given from the high temperature refrigerant flowing through the side, the temperature rise of the suction refrigerant is smaller than that when the bypass pipe 92A is not used, and the refrigerant flows through the bypass pipe 92A in addition to the refrigerant passage 24. Thus, the pressure loss can be reduced. Further, the low-temperature refrigerant sucked into the compressor 10 during the heating operation passes through the four-way valve 20 and the refrigerant passage 22.
Although the heat is applied from the high-temperature refrigerant flowing through the side, the temperature rise of the suction refrigerant and the temperature decrease of the discharge refrigerant are less than those in the case where the bypass pipe 94A is not used, and the bypass pipe in addition to the refrigerant passage 23 is used. The pressure loss can be reduced by flowing the refrigerant through 94A. As the opening / closing valve 92B and the opening / closing valve 94B, an expansion valve can be used as well as the electromagnetic valve, as in the above embodiment. Also,
As the opening / closing valve 92B or the opening / closing valve 94B in this embodiment, a three-way valve or the like may be used as described in the above embodiments. Also, the check valve 92C and the check valve 94C
The refrigerant passage 24 and the refrigerant passage 23 of the four-way valve 20 may be closed so that the refrigerant does not flow without using.

Next, an air conditioner according to another embodiment of the present invention will be described with reference to FIG. The members having the same functions as those in the above embodiment are designated by the same reference numerals and the description thereof will be omitted. In the embodiment shown in FIG. 10, the check valve 92C and the check valve 94C shown in FIG. A check valve 96 for blocking the flow of the refrigerant from the four-way valve 20 is provided between the section and the four-way valve 20.

In this embodiment, the flow of the refrigerant and the effects produced by the flow of the refrigerant are the same as those in FIG.
According to the present embodiment, the number of check valves can be reduced by one as compared with the embodiment of FIG. 9, so that it is suitable for saving space and can be constructed at low cost. The check valve 96 may not be used, and the refrigerant passage 23 and the refrigerant passage 24 of the four-way valve 20 may be closed so that the refrigerant does not flow.

Next, an air conditioner according to another embodiment of the present invention will be described with reference to FIG. It should be noted that the members having the same functions as those in the above-mentioned respective embodiments are designated by the same reference numerals and the description thereof will be omitted. In the embodiment shown in FIG. 11, in addition to the bypass pipe 91A and the opening / closing valve 91B shown in FIG. 1, a bypass pipe 94A and an opening / closing valve 94B shown in FIG.
1C is removed.

The flow of the refrigerant will be described below. First, the refrigerant flow in the cooling operation will be described. During the cooling operation, the open / close valve 91B is opened and the open / close valve 94B is closed. Therefore, the high-temperature and high-pressure refrigerant compressed by the compressor 10 together with the refrigerant passage 21 of the four-way valve 20 is bypass pipe 9
1A, and is led to the outdoor heat exchanger 30 through the gas side pipe 62A. The refrigerant condensed in the outdoor heat exchanger 30 passes through the liquid side pipe 61A, is decompressed by the expansion device 40, and is guided to the indoor heat exchanger 50 through the liquid side pipe 61B and the liquid side connection pipe 61C. The refrigerant evaporated in the indoor heat exchanger 50 is connected to the gas side connecting pipe 62C and the gas side pipe 62.
B, and is sucked into the suction port of the compressor 10 through the gas side pipe 62E.

Next, the refrigerant flow in the cooling operation will be described. During heating operation, the on-off valve 91B is closed and the on-off valve 9
4B is opened. Therefore, the high-temperature and high-pressure refrigerant compressed by the compressor 10 includes the gas side pipe 62D, the refrigerant passage 22 of the four-way valve 20, the gas side pipe 62B, and the gas side connecting pipe 62C.
And is guided to the indoor heat exchanger 50. The refrigerant condensed in the indoor heat exchanger 50 is guided to the expansion device 40 through the liquid side connection pipe 61C and the liquid side pipe 61B. Then, the refrigerant decompressed by the expansion device 40 is guided to the outdoor heat exchanger 30 through the liquid side pipe 61A. This outdoor heat exchanger 3
The refrigerant evaporated in 0 flows through the gas side pipe 62A to the bypass pipe 94A together with the refrigerant passage 23 of the four-way valve 20, and is sucked into the suction port of the compressor 10 through the gas side pipe 62E.

In this embodiment, as is clear from the above description, the high-temperature refrigerant discharged from the compressor 10 during the cooling operation, together with the refrigerant passage 21 in the four-way valve 20, is bypass pipe 9.
Flow through 1A. Therefore, the low-temperature refrigerant sucked into the compressor 10 during the cooling operation passes through the four-way valve 20 and the refrigerant passage 21.
Since heat is less given from the high-temperature refrigerant flowing on the side, the compression efficiency is not reduced. Further, in this embodiment, as is clear from the above description, the low-temperature refrigerant sucked into the compressor 10 during the heating operation flows through the bypass pipe 94A together with the refrigerant passage 23 in the four-way valve 20. Therefore, the high-temperature refrigerant discharged from the compressor 10 during the heating operation is less likely to be deprived of heat by the low-temperature refrigerant via the four-way valve 20, so that the condensing capacity of the indoor heat exchanger 50 is reduced. There is no. The low-temperature refrigerant sucked into the compressor 10 during the heating operation passes through the four-way valve 20 and the refrigerant passage 2
Since heat is rarely given from the high-temperature refrigerant flowing on the second side, it is possible to prevent a decrease in compression efficiency. In addition to the refrigerant passage 21 and the refrigerant passage 24, the bypass pipe 91
By flowing the refrigerant through A and the bypass pipe 92A, it is possible to reduce the pressure loss and prevent the liquid refrigerant from accumulating due to the blocking of the refrigerant passage. As the opening / closing valve 91B and the opening / closing valve 94B, an expansion valve can be used in addition to the electromagnetic valve, as in the above embodiment.

Next, an air conditioner according to another embodiment of the present invention will be described with reference to FIG. The members having the same functions as those in the above embodiment are designated by the same reference numerals and the description thereof will be omitted. In the embodiment shown in FIG. 12, a bypass pipe 92A and an opening / closing valve 92B shown in FIG. 2 are provided, a bypass pipe 93A and an opening / closing valve 93B shown in FIG. 4 are provided, and the check valve 92C is removed.

The flow of the refrigerant will be described below. First, the refrigerant flow in the cooling operation will be described. During the cooling operation, the open / close valve 93B is closed and the open / close valve 92B is opened. The high-temperature and high-pressure refrigerant compressed by the compressor 10 flows through the refrigerant passage 21 of the four-way valve 20 and the gas side pipe 62A and is guided to the outdoor heat exchanger 30. The refrigerant condensed in the outdoor heat exchanger 30 passes through the liquid side pipe 61A, is decompressed by the expansion device 40, and is guided to the indoor heat exchanger 50 through the liquid side pipe 61B and the liquid side connection pipe 61C. The refrigerant evaporated in the indoor heat exchanger 50 is connected to the gas side connecting pipe 62C and the gas side pipe 6
2B, flows into the bypass pipe 92A together with the refrigerant passage 24 of the four-way valve 20, and is sucked into the suction port of the compressor 10 through the gas side pipe 62E.

Next, the refrigerant flow in the heating operation will be described. During heating operation, the open / close valve 93B is opened and the open / close valve 9 is opened.
2B is closed. Therefore, the high-temperature high-pressure refrigerant compressed by the compressor 10 flows into the bypass pipe 93A together with the refrigerant passage 22 of the four-way valve 20, flows through the gas side pipe 62B and the gas side connecting pipe 62C, and is guided to the indoor heat exchanger 50. . The refrigerant condensed in the indoor heat exchanger 50 is connected to the liquid side connecting pipe 6
1C, is led to the expansion device 40 through the liquid side pipe 61B. Then, the refrigerant decompressed by the expansion device 40 is guided to the outdoor heat exchanger 30 through the liquid side pipe 61A. The refrigerant evaporated in this outdoor heat exchanger 30 is connected to the gas side pipe 62.
A, the refrigerant passage 23 of the four-way valve 20, and the gas side pipe 62E are drawn into the suction port of the compressor 10.

In this embodiment, as is clear from the above description, the low-temperature refrigerant sucked into the compressor 10 during the cooling operation, together with the refrigerant passage 24 in the four-way valve 20, is bypass pipe 9.
Flow through 2A. Therefore, as compared with the case where the bypass pipe 92A is not used, the temperature rise of the intake refrigerant is small, and the refrigerant flows through the bypass pipe 92A in addition to the refrigerant passage 24 on the intake side, which is a factor that significantly reduces the cooling performance. A certain pressure loss can be greatly reduced. Further, in this embodiment, as is clear from the above description, the high-temperature refrigerant discharged from the compressor 10 during the heating operation is the four-way valve 2
It flows through the bypass pipe 93 </ b> A together with the refrigerant passage 22 in 0. Therefore, the high-temperature refrigerant discharged from the compressor 10 during the heating operation is less likely to be deprived of heat by the low-temperature refrigerant flowing through the four-way valve 20 on the refrigerant passage 21 side. Does not reduce the condensation capacity.
Further, the low-temperature refrigerant sucked into the compressor 10 during the heating operation is less likely to be given heat from the high-temperature refrigerant via the four-way valve 20, so that the reduction in compression efficiency can be reduced. In addition to the refrigerant passage 22, the bypass pipe 93
By flowing the refrigerant through A, it is possible to reduce the pressure loss and prevent the liquid refrigerant from accumulating due to the blocking of the refrigerant passage. The on-off valve 9
As the open / close valve 2B and the open / close valve 93B, an expansion valve can be used as well as the electromagnetic valve, as in the above embodiment.

Next, an air conditioner according to another embodiment of the present invention will be described with reference to FIG. The members having the same functions as those in the above embodiment are designated by the same reference numerals and the description thereof will be omitted. In addition to the bypass pipe 91A, the opening / closing valve 91B, the bypass pipe 93A, the opening / closing valve 93B, and the check valve 95 shown in FIG. 8, the embodiment shown in FIG. 94A, open / close valve 94
B, a check valve 96 is provided.

The flow of the refrigerant will be described below. First, the refrigerant flow in the cooling operation will be described. During the cooling operation, the on-off valve 91B and the on-off valve 92B are opened,
The on-off valve 93B and the on-off valve 94B are closed. Therefore, the high-temperature and high-pressure refrigerant compressed by the compressor 10 flows through the bypass pipe 91A and is guided to the outdoor heat exchanger 30. At this time, the check valve 95 blocks the flow of the refrigerant to the four-way valve 20, so that the refrigerant does not flow to the refrigerant passage 21. The refrigerant condensed in the outdoor heat exchanger 30 is connected to the liquid side pipe 61.
The pressure is reduced by the expansion device 40 through A, and the liquid side pipe 61B,
It is guided to the indoor heat exchanger 50 through the liquid side connection pipe 61C. The refrigerant evaporated in the indoor heat exchanger 50 has a gas side connecting pipe 62C, a gas side pipe 62B, a bypass pipe 92A,
It is sucked into the suction port of the compressor 10 through the gas side pipe 62E. At this time, the check valve 96 causes the gas side pipe 62 to
Since the flow of the refrigerant from B to the four-way valve 20 is blocked, the refrigerant does not flow in the refrigerant passage 24.

Next, the refrigerant flow in the heating operation will be described. On-off valve 91B and on-off valve 92 during heating operation
B is closed, and the open / close valve 93B and the open / close valve 94B are opened. Therefore, the high-temperature high-pressure refrigerant compressed by the compressor 10 flows through the bypass pipe 93A, the gas side pipe 62B, and the gas side connecting pipe 62C and is guided to the indoor heat exchanger 50.
At this time, the check valve 95 blocks the flow of the refrigerant to the four-way valve 20, so that the refrigerant does not flow to the refrigerant passage 22. The refrigerant condensed in the indoor heat exchanger 50 is guided to the expansion device 40 through the liquid side connection pipe 61C and the liquid side pipe 61B. Then, the refrigerant decompressed by the expansion device 40 is guided to the outdoor heat exchanger 30 through the liquid side pipe 61A.
The refrigerant evaporated in the outdoor heat exchanger 30 is connected to the gas side pipe 6
It is sucked into the suction port of the compressor 10 through 2A, the bypass pipe 94A, and the gas side pipe 62E. At this time, the check valve 96
As a result, the refrigerant flow from the gas side pipe 62A to the four-way valve 20 is blocked, so that no refrigerant flows in the refrigerant passage 23.

In this embodiment, as is clear from the above description, the high temperature refrigerant discharged from the compressor 10 during the cooling operation flows through the bypass pipe 91A and the refrigerant passage 21 in the four-way valve 20. In addition, the low temperature refrigerant which is sucked into the compressor 10 flows through the bypass pipe 92A, and the four-way valve 20
It does not pass through the internal refrigerant passage 24. Therefore, the low-temperature refrigerant sucked into the compressor 10 during the cooling operation is not given heat from the high-temperature refrigerant via the four-way valve 20, so that the compression efficiency is not lowered. Further, in this embodiment, the high-temperature refrigerant discharged from the compressor 10 and the low-temperature refrigerant sucked into the compressor 10 during the heating operation flow through the bypass pipe 93A and the bypass pipe 94A, respectively, and the four-way valve 20.
It does not pass through the refrigerant passage 22 and the refrigerant passage 23 therein. Therefore, the high-temperature refrigerant discharged from the compressor 10 during the heating operation is not deprived of heat by the low-temperature refrigerant via the four-way valve 20, so that the condensing capacity of the indoor heat exchanger 50 can be reduced. Absent. Further, since the low-temperature refrigerant sucked into the compressor 10 during the heating operation is not given heat from the high-temperature refrigerant via the four-way valve 20, the compression efficiency is not lowered.

In this embodiment, the check valves 95 and 96 are used to prevent the refrigerant from flowing through the refrigerant passage 21, the refrigerant passage 22, the refrigerant passage 23, and the refrigerant passage 24 of the four-way valve 20. However, the refrigerant may flow through the refrigerant passage 21 and the refrigerant passage 22 without providing the check valve 95. Alternatively, the check valve 96 may not be provided, and the refrigerant may flow through the refrigerant passage 23 and the refrigerant passage 24. Alternatively, the check valve 95 and the check valve 96 may not be provided, and the refrigerant may flow through the refrigerant passage 21, the refrigerant passage 22, the refrigerant passage 23, and the refrigerant passage 24. In this case, the high-temperature refrigerant discharged from the compressor 10 during the cooling operation gives heat to the low-temperature refrigerant flowing in the refrigerant passage 24 side through the four-way valve 20, but the bypass pipe 91A and the bypass pipe 91A are bypassed. Compared with the case where the pipe 92A is not used, the temperature rise of the suctioned refrigerant is small, and the pressure loss is reduced by the refrigerant flowing through the bypass pipe 91A in addition to the refrigerant passage 21 and the refrigerant flowing through the bypass pipe 92A in addition to the refrigerant passage 24. can do. Further, the high-temperature refrigerant discharged from the compressor 10 during the heating operation gives heat to the low-temperature refrigerant flowing through the four-way valve 20 on the refrigerant passage 23 side. Compared with the case where it is not used, the temperature rise of the suction refrigerant and the temperature decrease of the discharge refrigerant are small, and in addition to the refrigerant passage 22, the bypass pipe 93 is provided.
By adding A to the refrigerant passage 23 and flowing the refrigerant through the bypass pipe 94A, the pressure loss can be reduced. The on-off valve 91B, the on-off valve 92B, the on-off valve 93
B or the on-off valve 94B, as in the above embodiment,
An expansion valve can be used in addition to the solenoid valve. Further, the on-off valve 91B on-off valve 92B and the on-off valve 93 in the present embodiment.
As B or the opening / closing valve 94B, a three-way valve or the like may be used as described in the above embodiment. In addition, without using the check valve 95, the refrigerant passage 21 of the four-way valve 20.
Alternatively, at least one or both of the refrigerant passages 22 may be closed so that the refrigerant does not flow, and the refrigerant does not flow through at least one or both of the refrigerant passages 23 and the refrigerant passages 24 of the four-way valve 20 without using the check valve 96. You can close it.

Next, an air conditioner according to another embodiment of the present invention will be described with reference to FIG. The members having the same functions as those in the above embodiment are designated by the same reference numerals and the description thereof will be omitted. In the embodiment shown in FIG. 14, a bypass pipe 91A, a bypass pipe 93A and a gas side pipe 62D are used instead of the open / close valve 91B, the open / close valve 93B and the check valve 95 shown in FIG.
A three-way valve 97 is provided at the connecting portion with. In this embodiment, the three-way valve 97 switches the refrigerant so that the refrigerant flows through the bypass pipe 91A during the cooling operation and the refrigerant flows through the bypass pipe 93A during the heating operation.

In this embodiment, the flow of the refrigerant and the effects produced by the flow of the refrigerant are the same as those in FIG.
According to the present embodiment, the number of valves used can be reduced as compared with the embodiment of FIG. 8, so that it is suitable for space saving and can be constructed at low cost.

Next, an air conditioner according to another embodiment of the present invention will be described with reference to FIG. The members having the same functions as those in the above embodiment are designated by the same reference numerals and the description thereof will be omitted. In the embodiment shown in FIG. 15, an on-off valve 91B and an on-off valve 93B are provided instead of the three-way valve 97 shown in FIG. In this embodiment, the opening / closing valve 91B is used during the cooling operation.
Is opened and the on-off valve 93B is closed so that the refrigerant flows through the bypass pipe 91A, the on-off valve 91B is closed during the heating operation,
The on-off valve 93B is opened and the bypass pipe 93A is switched so that the refrigerant flows. In this embodiment, the flow of the refrigerant and the effects produced by the flow of the refrigerant are the same as in FIG.

Next, an air conditioner according to another embodiment of the present invention will be described with reference to FIG. The members having the same functions as those in the above embodiment are designated by the same reference numerals and the description thereof will be omitted. In the embodiment shown in FIG. 16, instead of the opening / closing valve 92B, the opening / closing valve 94B, and the check valve 96 shown in FIG. 10, a bypass pipe 91A, a bypass pipe 93A, and a gas side pipe 62 are provided.
A three-way valve 98 is provided at the connecting portion with D. In the present embodiment, the three-way valve 98 is switched so that the refrigerant flows through the bypass pipe 92A during the cooling operation and the refrigerant flows through the bypass pipe 94A during the heating operation.

In this embodiment, the flow of the refrigerant and the effects produced by the flow of the refrigerant are the same as in FIG. According to the present embodiment, the number of valves to be used can be reduced as compared with the embodiment of FIG.

Next, an air conditioner according to another embodiment of the present invention will be described with reference to FIG. The members having the same functions as those in the above embodiment are designated by the same reference numerals and the description thereof will be omitted. In the embodiment shown in FIG. 17, an on-off valve 92B and an on-off valve 94B are provided instead of the three-way valve 98 shown in FIG. In this embodiment, the open / close valve 92B is used during the cooling operation.
Is opened, the on-off valve 94B is closed, and the on-off valve 92B is closed during the heating operation so that the refrigerant flows through the bypass pipe 92A.
The on-off valve 94B is opened and the bypass pipe 94A is switched so that the refrigerant flows. In this embodiment, the flow of the refrigerant and the effects produced by the flow of the refrigerant are the same as those in FIG.

Although the above embodiment has been described with reference to the air conditioner, it can be applied to a refrigeration cycle device having a four-way valve such as a vending machine. Further, even if a refrigerant heating device is provided instead of the compressor, a high-temperature refrigerant and a low-temperature refrigerant flow in one valve body, and a refrigeration cycle equipped with a four-way valve whose flow path can be changed. The present invention can be applied to any device. In addition, the four-way valve and the two-way valve used in the above-mentioned examples are structurally a four-way valve mechanism and a two-way valve, a solenoid valve,
Alternatively, the expansion valve mechanism may be a special valve such as a six-way valve integrally formed with a drive mechanism interposed therebetween. That is, even if it is a special valve such as a six-way valve, using a two-way valve, a solenoid valve, or a constituent part of an expansion valve mechanism,
By bypassing the refrigerant passage that substantially constitutes the four-way valve, the same operational effects as those of the above-described embodiment can be obtained.

[0088]

INDUSTRIAL APPLICABILITY As described above, the present invention can provide a refrigeration cycle apparatus, particularly an air conditioner, which uses a four-way valve and reduces the problem of heat loss of the four-way valve. Has the following effects. Claim
According to the present invention described in 1, it is possible to reduce the temperature rise of the refrigerant sucked into the compressor due to the refrigerant discharged from the compressor during the cooling operation. By flowing, the pressure loss, which is a factor that greatly reduces the cooling performance, can be greatly reduced. Also, when flowing the refrigerant through the bypass pipe,
Refrigerant passage of four-way valve in parallel with bypass pipe for flowing medium
By preventing the flow of refrigerant into the
You can stop. According to the invention of claim 2 ,
It is possible to further reduce the temperature rise of the refrigerant sucked into the compressor due to the refrigerant discharged from the compressor during the cooling operation, and to reduce the pressure loss by flowing the refrigerant through each bypass pipe in addition to the refrigerant passage. You can Also, the viper
When the refrigerant flows through the refrigerant pipe , the heat loss can be more surely prevented by preventing the refrigerant from flowing through the refrigerant passage of the four-way valve in parallel with the bypass pipe through which the refrigerant flows . Contract
According to the present invention described in claim 3, the high-temperature refrigerant discharged from the compressor during the heating operation is less likely to be deprived of heat by the low-temperature refrigerant through the four-way valve, so that the condensation in the indoor heat exchanger is performed. The capacity is less likely to decrease, and the low-temperature refrigerant sucked into the compressor during the heating operation is less likely to be given heat from the high-temperature refrigerant via the four-way valve, so the compression efficiency is less likely to decrease. Moreover, since the refrigerant passage on the high pressure side of the four-way valve is not blocked, the liquid refrigerant does not stay in the four-way valve. Also, when flowing the refrigerant through the bypass pipe,
Refrigerant passage of four-way valve in parallel with bypass pipe for flowing medium
By preventing the flow of refrigerant into the
You can stop. According to the invention of claim 4 ,
A refrigerant passage that connects the discharge port of the compressor and the outdoor heat exchanger,
And, by flowing the refrigerant during the heating operation to the bypass pipes respectively provided in parallel with the refrigerant passages that communicate the indoor heat exchanger and the suction port of the compressor, the high-temperature refrigerant discharged from the compressor during the heating operation is: Since heat is less lost to the low-temperature refrigerant via the four-way valve, the condensation capacity in the indoor heat exchanger is less reduced, and the low-temperature refrigerant sucked into the compressor during the heating operation is The heat from the hot refrigerant is less likely to be given through the four-way valve, so that the compression efficiency is less reduced. Also a bypass pipe
When flowing the refrigerant into the
By not letting the refrigerant flow through the refrigerant passage of the four-way valve
Thus, heat loss can be prevented more reliably. Claim
According to the present invention as described in 5 , the refrigerant is caused to flow through the bypass pipe provided in parallel with the refrigerant passage that communicates the indoor heat exchanger and the suction port of the compressor during the cooling operation. It is possible to reduce the temperature rise of the refrigerant sucked into the compressor due to the discharged refrigerant, and also to reduce the pressure loss, which is a factor that greatly reduces the cooling performance, because the refrigerant flows through the bypass pipe in addition to the refrigerant passage. You can Also, during the heating operation, by flowing the refrigerant through the bypass pipe provided in parallel with the refrigerant passage that connects the outdoor heat exchanger and the suction port of the compressor, the high temperature refrigerant discharged from the compressor during the heating operation is Since the low-temperature refrigerant is less likely to absorb heat through the valve, the condensing capacity in the indoor heat exchanger is less likely to decrease, and the low-temperature refrigerant sucked into the compressor during heating operation uses a four-way valve. Since the heat from the high-temperature refrigerant is less likely to be passed through, the compression efficiency is less likely to decrease. According to the invention of claim 6, it is possible to reduce the temperature rise of the refrigerant sucked into the compressor by the refrigerant discharged from the compressor during the cooling operation, and the refrigerant flows through the bypass pipe in addition to the refrigerant passage, In addition, pressure loss can be reduced by controlling with an on-off valve. Also,
The high-temperature refrigerant discharged from the compressor during the heating operation is less likely to lose heat to the low-temperature refrigerant through the four-way valve, so the condensation capacity in the indoor heat exchanger is less likely to decrease, and the heating operation The low-temperature refrigerant that is sometimes drawn into the compressor is less likely to receive heat from the high-temperature refrigerant via the four-way valve, and therefore the compression efficiency is less likely to decrease. Moreover, since the refrigerant passage on the high pressure side of the four-way valve is not blocked, the liquid refrigerant does not stay in the four-way valve. According to the invention of claim 7, it is possible to reduce the temperature rise of the refrigerant sucked into the compressor due to the refrigerant discharged from the compressor during the cooling operation, and, in addition to the refrigerant passage, the bypass pipe is provided on the suction side. The flow of the refrigerant makes it possible to greatly reduce the pressure loss, which is a factor that significantly reduces the cooling performance. In addition, the high-temperature refrigerant discharged from the compressor during the heating operation is less likely to lose heat to the low-temperature refrigerant via the four-way valve, so the condensation capacity in the indoor heat exchanger is less likely to decrease, and The low-temperature refrigerant sucked into the compressor during the heating operation is less likely to receive heat from the high-temperature refrigerant via the four-way valve, and therefore the compression efficiency is less likely to decrease. According to the present invention as set forth in claim 8 , during cooling operation, a bypass pipe provided in parallel with a refrigerant passage communicating the discharge port of the compressor with the outdoor heat exchanger, and an intake port of the indoor heat exchanger and the compressor. By causing the refrigerant to flow through the bypass pipe provided in parallel with the refrigerant passage that communicates with the refrigerant passage, it is possible to further reduce the temperature rise of the refrigerant sucked into the compressor due to the refrigerant discharged from the compressor during the cooling operation. In addition to that, the refrigerant flows through the bypass pipe, so that the pressure loss can be further reduced. Further, during the heating operation, a bypass pipe provided in parallel with the refrigerant passage communicating the discharge port of the compressor and the indoor heat exchanger,
Also, the high-temperature refrigerant discharged from the compressor during the heating operation is passed through the four-way valve by causing the refrigerant to flow through the bypass pipes provided in parallel with the refrigerant passages that communicate the outdoor heat exchanger and the suction port of the compressor. Since the low temperature refrigerant takes less heat, the condensing capacity in the indoor heat exchanger is less likely to decrease further, and the low temperature refrigerant sucked into the compressor during the heating operation passes through the four-way valve. Since heat is rarely given from the high temperature refrigerant, the compression efficiency is further reduced. According to the present invention described in claim 9, by providing the on-off valves on the bypass pipes respectively, it is possible to cause the refrigerant to flow through the bypass pipes according to the operating state, and it is possible to always perform optimal and efficient operation. In addition, pressure loss can be reduced by controlling with an on-off valve. Claim
According to the invention of Item 10, by using the expansion valve as the opening / closing valve, it is sufficient to input only when the opening / closing operation is performed,
It is possible to reduce power consumption. According to the eleventh aspect of the present invention, when the refrigerant flows through the bypass pipe, the refrigerant does not flow through the refrigerant passage of the four-way valve which is in parallel with the bypass pipe through which the refrigerant flows. A large reduction is achieved and heat loss can be almost eliminated through the four-way valve. According to the invention of claim 12 ,
Heat loss can be reduced in any operating state, and pressure loss can be reduced by controlling using an on-off valve. Moreover, since the refrigerant passage on the high pressure side of the four-way valve is not blocked, the liquid refrigerant does not stay in the four-way valve. Also, when flowing the refrigerant through the bypass pipe
Is the cooling of the four-way valve in parallel with the bypass pipe through which the refrigerant flows.
By not flowing the refrigerant in the medium passage, heat loss can be further confirmed.
It can be prevented. Also, set the bypass pipe to the low temperature side.
By installing in parallel with the refrigerant passage of the four-way valve through which the refrigerant flows
Prevents the temperature of the high temperature side refrigerant from decreasing,
It is possible to prevent the temperature rise. According to the thirteenth aspect of the present invention, by using the expansion valve as the opening / closing valve, it is necessary to input only when the opening / closing operation is performed, and the power consumption can be reduced. According to the fourteenth aspect of the present invention, by providing the bypass pipe in parallel with the refrigerant passage of the four-way valve through which the high temperature side refrigerant flows, the temperature decrease of the high temperature side refrigerant is prevented and the low temperature side refrigerant temperature rise is prevented. Can be prevented. According to the present invention as set forth in claim 15 , by electrically blocking the refrigerant passage in the four-way valve by using the check valve, electrical protection control is performed at the abnormal time when the high pressure side pipe of the compressor is blocked. Even if the function does not work, damage to the compressor can be prevented by breaking the check valve.

[Brief description of drawings]

FIG. 1 is a refrigeration cycle diagram of an air conditioner that is an embodiment of the present invention.

FIG. 2 is a refrigeration cycle diagram of an air conditioner that is another embodiment of the present invention.

FIG. 3 is a refrigeration cycle diagram of an air conditioner that is another embodiment of the present invention.

FIG. 4 is a refrigeration cycle diagram of an air conditioner that is another embodiment of the present invention.

FIG. 5 is a refrigeration cycle diagram of an air conditioner that is another embodiment of the present invention.

FIG. 6 is a refrigeration cycle diagram of an air conditioner that is another embodiment of the present invention.

FIG. 7 is a refrigeration cycle diagram of an air conditioner that is another embodiment of the present invention.

FIG. 8 is a refrigeration cycle diagram of an air conditioner that is another embodiment of the present invention.

FIG. 9 is a refrigeration cycle diagram of an air conditioner that is another embodiment of the present invention.

FIG. 10 is a refrigeration cycle diagram of an air conditioner that is another embodiment of the present invention.

FIG. 11 is a refrigeration cycle diagram of an air conditioner that is another embodiment of the present invention.

FIG. 12 is a refrigeration cycle diagram of an air conditioner that is another embodiment of the present invention.

FIG. 13 is a refrigeration cycle diagram of an air conditioner that is another embodiment of the present invention.

FIG. 14 is a refrigeration cycle diagram of an air conditioner that is another embodiment of the present invention.

FIG. 15 is a refrigeration cycle diagram of an air conditioner that is another embodiment of the present invention.

FIG. 16 is a refrigeration cycle diagram of an air conditioner that is another embodiment of the present invention.

FIG. 17 is a refrigeration cycle diagram of an air conditioner that is another embodiment of the present invention.

FIG. 18 is a sectional view showing a schematic configuration of a three-way valve.

FIG. 19 is a sectional view showing a schematic configuration of a three-way valve.

FIG. 20 is a sectional view showing a schematic configuration of a two-way valve.

[Explanation of symbols]

10 compressor 20 four-way valve 21 Refrigerant passage 22 Refrigerant passage 23 Refrigerant passage 24 Refrigerant passage 30 outdoor heat exchanger 40 diaphragm device 50 Indoor heat exchanger 91A Bypass pipe 91B open / close valve 91C check valve 92A bypass pipe 92B open / close valve 92C check valve 93A bypass pipe 93B open / close valve 93C check valve 94A bypass pipe 94B open / close valve 94C check valve

Continuation of the front page (56) Reference JP 2000-111188 (JP, A) JP 11-132587 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) F25B 13/00 F25B 41/04

Claims (15)

(57) [Claims] 1. An air conditioner having a refrigeration cycle in which a compressor, an indoor heat exchanger, a throttle device, and an outdoor heat exchanger are connected by piping via a four-way valve, wherein a refrigerant passage of the four-way valve is included. It is one of the bypass pipe provided with the indoor heat exchanger and the suction port of the compressor in parallel in the refrigerant passage communicating the, during the cooling operation, and the flow of the refrigerant in the bypass pipe, wherein
When flowing the refrigerant through the bypass pipe, the bypass
Refrigerant in the refrigerant passage of the four-way valve in parallel with the pass pipe
An air conditioner characterized by not flowing . 2. An air conditioner having a refrigeration cycle in which a compressor, an indoor heat exchanger, a throttle device, and an outdoor heat exchanger are connected by piping via a four-way valve, wherein a refrigerant passage of the four-way valve is included. A cooling medium passage that connects the discharge port of the compressor and the outdoor heat exchanger, and a cooling medium passage that communicates the indoor heat exchanger and the suction port of the compressor with bypass pipes, respectively, for cooling operation sometimes, two to flow the refrigerant in the bypass pipe, when the refrigerant flows into the two said bypass pipe
Is the four pipes that are in parallel with the bypass pipe through which the refrigerant flows.
An air conditioner characterized in that no refrigerant flows into the refrigerant passage of the one-way valve . 3. An air conditioner having a refrigeration cycle in which a compressor, an indoor heat exchanger, a throttle device, and an outdoor heat exchanger are connected by piping through a four-way valve, wherein a refrigerant passage of the four-way valve is included. A bypass pipe is provided in parallel with the refrigerant passage that communicates the outdoor heat exchanger and the suction port of the compressor, and an opening / closing valve is provided in the bypass pipe, and the opening / closing valve is opened during heating operation. to flow the refrigerant in the bypass pipe, wherein the bar
When flowing the refrigerant through the bypass pipe,
Flow the refrigerant through the refrigerant passage of the four-way valve in parallel with the pipe.
An air conditioner characterized by not doing. 4. An air conditioner having a refrigeration cycle in which a compressor, an indoor heat exchanger, a throttle device, and an outdoor heat exchanger are connected by piping via a four-way valve, wherein a refrigerant passage of the four-way valve is included. A refrigerant passage that connects the discharge port of the compressor and the indoor heat exchanger, and a refrigerant passage that communicates the outdoor heat exchanger and the suction port of the compressor with bypass pipes provided in parallel, respectively, for heating operation sometimes, two to flow the refrigerant in the bypass pipe, when the refrigerant flows into the two said bypass pipe
An air conditioner, characterized in that does not flow the refrigerant in the refrigerant passage of the four-way valve which is in juxtaposition with the previous SL bypass pipe to flow refrigerant. 5. An air conditioner having a refrigeration cycle in which a compressor, an indoor heat exchanger, a throttle device, and an outdoor heat exchanger are connected by piping via a four-way valve, wherein a refrigerant passage of the four-way valve is included. A first bypass pipe is provided in parallel with the refrigerant passage that connects the outdoor heat exchanger and the suction port of the compressor,
A second bypass pipe is provided in parallel with a refrigerant passage communicating between the indoor heat exchanger and the suction port of the compressor, the refrigerant is caused to flow through the second bypass pipe during a cooling operation, and the second bypass pipe is provided during a heating operation. An air conditioner characterized in that a refrigerant is caused to flow through the first bypass pipe. 6. An air conditioner having a refrigeration cycle in which a compressor, an indoor heat exchanger, a throttle device, and an outdoor heat exchanger are connected by piping via a four-way valve, wherein a refrigerant passage of the four-way valve is included. A first bypass pipe is provided in parallel with a refrigerant passage communicating the discharge port of the compressor with the outdoor heat exchanger,
A second bypass pipe is provided in parallel with a refrigerant passage communicating between the outdoor heat exchanger and the suction port of the compressor, and a first opening / closing valve is provided in the first bypass pipe and a second bypass pipe is provided in the second bypass pipe. A second opening / closing valve is provided to open the first opening / closing valve and close the second opening / closing valve to flow the refrigerant into the first bypass pipe during the cooling operation, and to perform the first opening / closing during the heating operation. Close the valve,
An air conditioner, wherein the second on-off valve is opened and a refrigerant is allowed to flow through the second bypass pipe. 7. An air conditioner having a refrigeration cycle in which a compressor, an indoor heat exchanger, a throttle device, and an outdoor heat exchanger are connected by piping via a four-way valve, the refrigerant passage of the four-way valve A first bypass pipe is provided in parallel with a refrigerant passage communicating the discharge port of the compressor with the indoor heat exchanger,
A second bypass pipe is provided in parallel with a refrigerant passage communicating between the indoor heat exchanger and the suction port of the compressor, the refrigerant is caused to flow through the second bypass pipe during a cooling operation, and the second bypass pipe is provided during a heating operation. An air conditioner characterized in that a refrigerant is caused to flow through the first bypass pipe. 8. An air conditioner having a refrigeration cycle in which a compressor, an indoor heat exchanger, a throttle device, and an outdoor heat exchanger are connected by piping through a four-way valve, each refrigerant passage of the four-way valve. A bypass pipe provided in parallel with the refrigerant passage communicating the discharge port of the compressor and the outdoor heat exchanger in parallel during cooling operation, and the indoor heat exchanger and the suction port of the compressor. Refrigerant is caused to flow in a bypass pipe provided in parallel with a refrigerant passage communicating with the bypass pipe provided in parallel with a refrigerant passage communicating with the discharge port of the compressor and the indoor heat exchanger during the heating operation, and the outdoor. An air conditioner characterized in that a refrigerant flows through a bypass pipe provided in parallel with a refrigerant passage that connects a heat exchanger and an inlet of the compressor. The method according to claim 9, wherein the bypass pipe, according to claim 1, characterized in that it each off valves provided, according to claim 2, wherein
The air conditioner according to claim 4, claim 5, claim 7, or claim 8 . 10. The air conditioner according to claim 3, 6, or 9 , wherein an expansion valve is used as the on-off valve. When 11. the refrigerant flows in the bypass pipe, wherein, characterized in that does not flow the refrigerant in the refrigerant passage of the four-way valve which is in parallel with said bypass pipe to flow refrigerant
The air conditioner according to any one of claims 5 to 7 . 12. A refrigeration cycle apparatus connected by a pipe via a four-way valve, wherein a bypass pipe is provided in parallel with at least one refrigerant passage of the refrigerant passages of the four-way valve, and an opening / closing valve is provided in the bypass pipe. The refrigerant flow in the bypass pipe is controlled by opening and closing the on-off valve.
Is in parallel with the refrigerant passage of the four-way valve in which the low temperature side refrigerant flows.
When the refrigerant is supplied to the bypass pipe,
The refrigerant passage of the four-way valve in parallel with the bypass pipe.
A refrigeration cycle device characterized in that no refrigerant flows in the passage . 13. The refrigeration cycle apparatus according to claim 12 , wherein an expansion valve is used as the opening / closing valve. 14. The refrigeration cycle apparatus according to claim 12 , wherein the bypass pipe is provided in parallel with a refrigerant passage of the four-way valve through which a high temperature side refrigerant flows. 15. The refrigeration cycle apparatus according to claim 12 , wherein a flow of the refrigerant is blocked by using a check valve.