JPS5813820B2 - air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a heat pump type air conditioner that includes at least two outdoor heat exchangers, and switches to a reverse cycle cooling operation when each outdoor heat exchanger is frosted during heating operation. The present invention relates to an air conditioner in which condensed refrigerant from an indoor heat exchanger selectively flows into each outdoor heat exchanger to perform defrosting, thereby preventing a significant decrease in heating capacity.

Generally, in a heat pump type air conditioner, during cooling operation, the outdoor heat exchanger radiates heat, and the indoor heat exchanger absorbs heat to cool the room, and during heating operation, the outdoor heat exchanger uses the heat exchanger to cool the room. It is configured to absorb heat and radiate it through the indoor heat exchanger to heat the room.

In conventional air conditioners, if frost forms on the outdoor heat exchanger during heating operation, the outdoor heat exchanger switches to reverse cycle cooling operation or heats the outdoor heat exchanger using a heating device such as an electric heater. Defrosting the exchanger.

However, the former causes a drop in room temperature due to the blowing of cold air into the room, and the latter causes a significant increase in costs.

Taking the above points into consideration, the present invention includes at least two outdoor heat exchangers, and allows a condensed refrigerant and a low-pressure refrigerant to selectively flow into each outdoor heat exchanger, so that when frosting occurs, each outdoor heat exchanger is provided with at least two outdoor heat exchangers. Defrosting is performed by selectively flowing condensed refrigerant from an indoor heat exchanger into a heat exchanger.Next, this invention will be described in detail with reference to drawings showing embodiments thereof.

First, FIG. 1 and FIG. 2 showing one embodiment will be explained.

1 is a compressor, 2 is a four-way valve that switches between a cooling cycle and a heating cycle, and 3 is an indoor heat exchanger for indoor heating and cooling.
When cooling, it works as an evaporator to cool the room, and when heating,
It works as a condenser and heats the room.

4 is the main pressure reducing device such as a capillary tube, 5 and 6 are the first
, a second outdoor heat exchanger, which functions as a condenser during cooling and as an evaporator during heating.

7 and 8 are three-way valves inserted between one inlet and the other of the outdoor heat exchangers 5 and 6, respectively;
Details will be described later.

9 and 10 are one entrance and exit of the first outdoor heat exchanger 5 and the second
A first auxiliary pressure reducing device such as a capillary tube and a first check valve connected in series between the other entrance and exit port of the outdoor heat exchanger 6; A second auxiliary pressure reducing device such as a capillary tube and a second check valve 13 and 14 connected in series between the inlet and the other inlet and outlet of the first outdoor heat exchanger 5 have one side connected to both outdoor heat exchangers. first and second electromagnetic on-off valves connected to the other entrance and exit of the exchangers 5 and 6 and whose other ends are connected to the indoor heat exchanger 3;
15 is an accumulator located between the compressor 1 and the four-way valve 2.

Next, details of one three-way valve 7 will be explained.

16.17 are the first and second valve seats that divide one three-way valve 7 into three chambers 18.1920, the one chamber 18 in the center is connected to the four-way valve 2, and the two chambers 19 on the left side are the first chamber. Outside heat exchanger 5
The three chambers 20 on the right are connected to one entrance and exit of the second outdoor heat exchanger 6.

Reference numerals 21 and 22 indicate needle-shaped first and second valve bodies, which are provided in the second chamber 19 and the third chamber 20 so as to be slidable in the left-right direction.
3.24' are the first and second valve seats 16, 17 and the first
, a spring provided between the second valve rests 21 and 22, and the indoor heat exchanger 3 that passes through the electromagnetic on-off valves 13 and 14.
When high-pressure condensed refrigerant flows into the second chamber 19 or the third chamber 20, the pressure of the condensed refrigerant causes the spring 23.
24, the first and second valve bodies 21 and 22 fit into the first and second valve seats 16 and 17 to form one chamber 18, two chambers 19, or three chambers 2.
0 becomes disconnected.

Note that, like the one three-way valve 7, the other three-way valve 8 has three chambers 27, 28, 29 by the first and second valve seats 25, 26.
One chamber 27 is connected to the indoor heat exchanger 3 via the main pressure reducing device 4, and the second chamber 28 and the third chamber 29 are connected to the other entrance and exit of the first and second outdoor heat exchangers 5 and 6, respectively. The second chamber 28 and the third chamber 29 are connected to first and second valve bodies 30, 31, springs 32, . 33 is installed internally, and its operation is the same as that of the one three-way valve 7.

Next, the operation of the embodiment will be explained.

During cooling, as shown in FIG.
3.14 is closed, and the four-way valve 2 allows the refrigerant to flow to the compressor 1, the four-way valve 2, and one of the three-way valves 7, as shown by the solid arrow.
, the first and second outdoor heat exchangers 5 and 6, the other three-way valve 8, the main pressure reducing device 4, the indoor heat exchanger 3, the four-way valve 2, the accumulator 15, and the compressor 1. Heat is absorbed in the heat exchanger 3 and released in the first and second outdoor heat exchangers 5 and 6 to cool the room.

During heating, if no frost has formed on the first and second indoor heat exchangers 5.6, the first and second electromagnetic on-off valves 13.14 are closed, and in FIG. As a result, the refrigerant flows through the compressor 1, the four-way valve 2, the indoor heat exchanger 3, the main pressure reducing device 4, the other three-way valve 8, the first and second outdoor heat exchangers 5, as shown by the broken line arrows. 6, one three-way valve 7, four-way valve 2,
It circulates through the accumulator 15 and compressor 1, and the first and second
Heat is absorbed by the outdoor heat exchangers 5 and 6, and then transferred to the indoor heat exchanger 3.
It releases heat and heats the room.

When frost forms on the first outdoor heat exchanger 5, the first electromagnetic on-off valve 13 is opened and the high-pressure condensed refrigerant from the indoor heat exchanger 3, as shown in FIG. It flows into the two chambers 28 of the other three-way valve 8 and the first outdoor heat exchanger 5 through the first electromagnetic on-off valve 13 .

As the condensed refrigerant flows into the second chamber 28 of the other three-way valve 8, the first valve body 30 fits into the first valve seat 25 against the spring 32, and the first chamber 27 and the second chamber 28 are disconnected. At the same time, since the condensed refrigerant flows into the first outdoor heat exchanger 5, the first outdoor heat exchanger 5 functions as a condenser, releases heat, and defrosts itself.

Furthermore, since the condensed refrigerant flowing out from the first outdoor heat exchanger 5 is at a high pressure, the first valve body 21 of one of the three-way valves 7 fits into the first valve seat 16 against the spring 23. 19 and the second chamber 20 are disconnected, and the condensed refrigerant coming out of the first outdoor heat exchanger 5 expands through the first auxiliary pressure reducing device 9 and becomes a low-pressure refrigerant. It flows into the second outdoor heat exchanger 6 through the stop valve 10.

On the other hand, the low-pressure refrigerant that has flowed out from the indoor heat exchanger 3 and expanded through the main pressure reducing device 4 is transferred to the first valve body 30 of the other three-way valve 8.
is fitted into the first valve seat 25, so it passes through the first chamber 27 and third chamber 29 of the other three-way valve 8, joins with the low-pressure refrigerant from the first check valve 10, and flows into the second outdoor heat exchanger 6. flows into.

Since the first valve body 21 of one three-way valve 7 is fitted into the first valve seat 16, the evaporative refrigerant flowing out from the second outdoor heat exchanger 6 is transferred to the three chambers 20 of one three-way valve 7, One room 18,
It flows into the compressor 1 through the four-way valve 2 and the accumulator 15.

With the refrigerant cycle described above, the first outdoor heat exchanger 5
After defrosting is completed, the first electromagnetic on-off valve 13 is closed and normal heating operation is resumed.

Furthermore, when frost occurs on the second outdoor heat exchanger 6, the second electromagnetic on-off valve 1
4 is opened, and the high-pressure condensed refrigerant from the indoor heat exchanger 3 passes through the second electromagnetic on-off valve 14 and enters the three chambers 2 of the other three-way valve 8.
9 and the second outdoor heat exchanger 6, and the second valve body 31 of the other three-way valve 8 fits into the second valve seat 26,
The second outdoor heat exchanger 6 works as a condenser to release heat and defrost itself, and the second valve body 22 of one three-way valve 7 fits into the second valve seat 17, so that the second chamber The condensed refrigerant flowing out of the outer heat exchanger 6 passes through the second auxiliary pressure reducing device 11 and expands to become a low-pressure refrigerant, and passes through the second check valve 12 to become the first refrigerant.
It flows into the outdoor heat exchanger 5.

On the other hand, the low-pressure refrigerant that has flowed out from the indoor heat exchanger 3 and expanded through the main pressure reducing device 4 is transferred to the second valve body 31 of the other three-way valve 8.
is fitted into the second valve seat 26, so it passes through the first chamber 27 and second chamber 28 of the other three-way valve 8 and merges with the low-pressure refrigerant from the second check valve 12, and thereafter the first outdoor side heat exchange It flows into the compressor 1 through the container 5, the two chambers 19 and one chamber 18 of one three-way valve 7, the four-way valve 2, and the accumulator 15.

With the refrigeration cycle described above, the second outdoor heat exchanger 6
After defrosting is performed and the unboxing is completed, the second electromagnetic on-off valve 14 is closed and normal heating operation is resumed.

Therefore, in the embodiment, the outdoor heat exchanger 5,
6, the high-pressure condensed refrigerant can selectively flow from the indoor heat exchanger 3 into the first and second outdoor heat exchangers 56 simply by operating the electromagnetic on-off valve 1314. , it is possible to selectively defrost the first and second outdoor heat exchangers 5 and 6, and there is no need to switch the entire device to cooling operation for defrosting, and there is no significant reduction in heating capacity. It never occurs.

Next, FIG. 3 showing another embodiment will be explained.

In the above embodiment, two outdoor heat exchangers are used, but when three outdoor heat exchangers are used, each outdoor heat exchanger 34 , 34 . 34 is connected to one of the three-way valves 7, 7, and the other of the outdoor heat exchangers 34, 34.34 is connected to the other three-way valve 8, 8, respectively. One inlet/outlet of the outside heat exchanger 34 and the other inlet/outlet of the other outdoor heat exchangers 34 other than the outdoor heat exchanger 34 are connected through a series circuit including a check valve 35 and an auxiliary pressure reducing device 36. one of the three-way valves 7, 7 is connected to the four-way valve 2, each of the other three-way valves 8, 8 is connected to the indoor heat exchanger 3 via the main pressure reducing device 4, and Each outdoor heat exchanger 34, 34.3
The other entrance and exit of 4 are connected to electromagnetic on-off valves 37, 37.
37 to the indoor heat exchanger 3, each three-way valve 7,
The condensed refrigerant from the indoor heat exchanger 3 can freely flow into each of the outdoor heat exchangers 34, 34, 34 by means of the electromagnetic on-off valves 37, 8, and 8.

The structure and operation of each of the three-way valves 7, 7 and 8, 8 are the same as those of the three-way valves 7, 8 described above.

Therefore, in the embodiment, when frost occurs on the outdoor heat exchangers 34, 34.34 during heating operation, the electromagnetic on-off valves 37, 37, 37 are selectively opened, and each three-way valve 7, 7
and 8, 8, each outdoor heat exchanger 34, 3
4.34, the condensed refrigerant from the indoor heat exchanger 3 is selectively flowed into each outdoor heat exchanger 3 to work as a condenser.
4.34.34 defrosting is performed, and stable heating operation can be performed without causing a significant decrease in heating capacity.

Furthermore, when configuring the outdoor heat exchanger with four, the fourth
As shown in the figure, each outdoor heat exchanger 38
．． 38, 38. Both entrances and exits of 38 are connected to three-way valves 7 and 38, respectively.
7, 7 and 8, 8.8, the outdoor heat exchanger 38
One inlet/outlet of the other outdoor heat exchanger 38 is connected through a series circuit of a check valve 35 and an auxiliary pressure reducing device 36, and the three-way valves 7, 7. the other three-way valve 8, 8.8 is connected to the indoor heat exchanger 3 via the main pressure reducing device 4, and each of the outdoor heat exchangers 38, 38, 38. The other entrance and exit of 38 are connected to electromagnetic on-off valves 37.37 and 37.37, respectively.
connected to the indoor heat exchanger 3 through each electromagnetic on-off valve 37.
．． 37. By opening and closing 37, 37, each outdoor heat exchanger 3
8,3838.38, the condensed refrigerant from the indoor heat exchanger 3 is allowed to flow freely.

In addition, as shown in FIG. 5, two outdoor heat exchangers 3
8 into a pair and connect each outdoor heat exchanger 38 . 3
8 and 38. 38 are connected to the three-way valves 7, 7 on one side and the three-way valves 8, 8 on the other side, respectively, and in the pair, one inlet/outlet of the outdoor heat exchanger 38 is connected to the inlet/outlet of the other outdoor heat exchanger 38. Check valve 3 connects the other inlet and outlet.
5 and the auxiliary pressure reducing device 36 through a series circuit, each one of the three-way valves 7, 7 is connected to the four-way valve 2, and each other three-way valve 8, 8 is connected to the indoor side via the main pressure reducing device 4. Connected to the heat exchanger 3, and each outdoor heat exchanger 38, 38, 38.38
The other entrance and exit of the solenoid valves 37, 37, 3
7.37 to the indoor heat exchanger 3, and by opening and closing each electromagnetic on-off valve 37, 37, 37.37, the indoor heat exchanger 3 is connected to each outdoor heat exchanger 3838, 38.38. It is also possible to allow the condensed refrigerant from to flow in freely.

Furthermore, when configuring five outdoor heat exchangers, as shown in FIG. 6, two outdoor heat exchangers 39.3
9 and three outdoor heat exchangers 39, 39.39, each outdoor heat exchanger is divided into two parts, and each outdoor heat exchanger is divided into 39.39 and 39,39. 39, the condensed refrigerant from the indoor heat exchanger 3 may be selectively allowed to flow in.

Therefore, three-way valves 7, 8, auxiliary pressure reducing devices 9, 11, 3
6, check valves 10, 12, 35, electromagnetic on-off valves 13, 14.
By configuring 37 as described above, condensed refrigerant and low-pressure refrigerant can selectively flow into any number of outdoor heat exchangers 5, 6, 34, 38, and 39, and defrosting during heating operation can be performed. This can be done without causing a significant decrease in heating capacity, and stable heating operation can be performed, and the present invention can be applied to everything from small to large devices. As described above, the air conditioner of the present invention includes at least two outdoor heat exchangers of a heat pump type refrigerant cycle, and connects one inlet and outlet of each of the outdoor heat exchangers to one of the three-way valves. , connect the other inlet/outlet of both outdoor heat exchangers to the other three-way valve, and connect one inlet/outlet of one outdoor heat exchanger and the other inlet/outlet of the other outdoor heat exchanger to the other three-way valve. The check valve and one auxiliary pressure reducing device are connected through a series circuit, and one inlet and outlet of the other outdoor heat exchanger and the other inlet and outlet of one of the outdoor heat exchangers are connected to the other check valve. and the other auxiliary pressure reducing device through a series circuit, and one three-way valve is connected to a four-way valve,
The other three-way valve is connected to the indoor heat exchanger via the main pressure reducing device, and the other inlets and outlets of both the outdoor heat exchangers are connected to the indoor heat exchanger via electromagnetic shut-off valves, respectively. By selectively allowing condensed refrigerant and low-pressure refrigerant to flow into both outdoor heat exchangers using both three-way valves and both electromagnetic on-off valves, during heating operation, the outdoor side heat exchanger can be used without performing reverse cycle cooling operation. The heat exchanger can be defrosted selectively, the reduction in heating capacity during defrosting can be arbitrarily selected, and the defrosting does not cause cold air to be blown out and the heating capacity to be significantly reduced.

Therefore, this invention is applicable to everything from small-sized air conditioners to large-sized air conditioners, and is a very meaningful invention.

[Brief explanation of the drawing]

The drawings show an embodiment of the air conditioner of the present invention, and FIGS. 1 and 2 are piping diagrams of one embodiment. 3 to 6 are piping diagrams of other embodiments, respectively. 1... Compressor, 2... Four-way valve, 3...
... Indoor heat exchanger, 4... Main pressure reducing device,
5, 6, 34, 38.39... Outdoor heat exchanger, 7, 8... Three-way valve, 9, 11.36...
...Auxiliary pressure reducing device, 10,12.35...Check valve, 13,14.37...Solenoid on-off valve.

Claims (1)

[Claims] 1 Equipped with at least two outdoor heat exchangers of a heat pump type refrigeration cycle, each of the two outdoor heat exchangers has an inlet/outlet connected to one of the three-way valves, and the other of the two outdoor heat exchangers one check valve and one auxiliary pressure reducing device. are connected via a series circuit, and one inlet/outlet of the other outdoor heat exchanger and the other inlet/outlet of the one outdoor heat exchanger are connected to the other check valve and the other auxiliary pressure reducing device. are connected via a series circuit, the one three-way valve is connected to a four-way valve, the other three-way valve is connected to an indoor heat exchanger via a main pressure reducing device, and both the outdoor heat exchangers are connected through a series circuit. The other inlet and outlet of the container are connected to the indoor heat exchanger via electromagnetic shut-off valves, respectively, and the condensed refrigerant and low-pressure refrigerant are selected for the both outdoor heat exchangers by the two three-way valves and the two electromagnetic shut-off valves. 1. An air conditioner characterized in that air flows through the air.