JP2931383B2 - Temperature pulsation type air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention aims to improve the comfort by changing the air-conditioning temperature of a plurality of air-conditioned rooms, and to provide an appropriate stimulus through the surface of a human body. The present invention relates to a temperature pulsation type air conditioner as described above.

(Prior Art) Conventionally, a temperature pulsation type air conditioner of this type is described in Japanese Patent Publication No. Sho 63-52297, and as shown in FIG.
A first heat exchanger (E) and a second heat exchanger (F) are arranged in a case (A) having one inlet (B) and two outlets (C) and (D). The first heat exchanger (E) is opposed to the suction port (B), and a partition plate (G) is provided on the downstream side to form a first air-conditioning chamber (H). The second heat exchanger (F) is disposed downstream, and the partition plate (G) is provided.
And the second heat exchanger (F) and the second and third air conditioning rooms (I)
(J), and a damper (K) that alternately opens and closes the second and third air-conditioning rooms (I) and (J) on the partition plate (G).
(L), and further connects the refrigerant outlet of the second heat exchanger (F) and the refrigerant inlet of the first heat exchanger (E) in series through a communication path (M). An outlet passage (N) is connected to the refrigerant outlet of the heat exchanger (E), and the communication passage (M) and the outlet passage (N) are communicated with each other by a branch passage (O). A flow dividing valve (P) controlled by a signal from a thermistor (S1), and a signal from a thermistor (S2) (S3) to the communication path (M). It has been proposed to provide a flow control valve (Q) that is controlled based on the average value of the temperatures in the chambers (I) and (J) to change the air-conditioning temperature.

Thus, in the above configuration, the air sucked from the suction port (B) enters the first air-conditioning chamber (H) that has passed through the first heat exchanger (E). After controlling the temperature to a desired first set temperature by the operation of the flow dividing valve (P), the air is supplied from the first air-conditioning chamber (H) to the second air-conditioner by controlling the opening and closing of the dampers (K) and (L). Air conditioning room (I),
And alternately flow into one of the third air conditioning rooms (J). At this time, air flows into the other of the second and third air-conditioning chambers (I) and (J) through the second heat exchanger (F), so that the second and third air-conditioning chambers (I) A difference in elevation occurs between the temperatures of (J) and, as a result, the opening and closing control of the dampers (K) and (L) results in the respective outlets (C).
Air with temperature pulsation can be periodically discharged from (D) to change the temperature of the person to be air-conditioned, thereby improving the comfort during air conditioning.

(Problems to be Solved by the Invention) However, in the above-mentioned conventional air conditioner, the high-temperature mode using the first heat exchanger (E), the first heat exchanger (E) and the second heat exchanger (F) are used. ) Is switched between the high-temperature mode and the low-temperature mode by changing the heat exchange area instead of changing the refrigerant capacity, so that the waste heat ( Until the heat of condensation during cooling) was not used, it was radiated to the outdoor atmosphere. Also, the heat source capacity had to be increased in proportion to the desired temperature difference.

The present invention has been made in view of the above problems, and can switch between a high-temperature mode and a low-temperature mode without increasing the capacity, can freely set a mode switching cycle time, and use waste heat on the heat source side. It is an object of the present invention to provide a temperature pulsation type air conditioner capable of improving comfort while improving the comfort.

(Means for Solving the Problems) According to the first aspect of the present invention, a plurality of use side heat exchangers (1) and (2), a single heat source side heat exchanger (4) and a compressor (3) are provided. And the use side heat exchangers (1) and (2) are alternately switched at a predetermined cycle between a cooling mode serving as an evaporator and a heating mode serving as a condenser, and the temperature of the room to be air-conditioned is changed to the above. A switching mechanism for changing the period is provided.

The invention according to claim 2 includes a plurality of use side heat exchangers (1) and (2), one heat source side heat exchanger (4) and a compressor (3), and the compressor (3) ) Is connected to a discharge gas pipe (31) connected to the discharge side, and a heat source circuit (41) having the heat source side heat exchanger (4) interposed therebetween is connected to the heat source circuit (41).
And a plurality of first branch pipes (12) and (22) having expansion mechanisms (11) and (21) arranged side by side to use the respective use-side heat exchangers (1).
Connect to the inlet side of (2) and discharge gas pipe (3
A first control circuit (5) that bypasses the heat source side heat exchanger (4) is connected to 1), and a plurality of first control branch pipes (13) and (23) are connected to the control circuit (5). The control branch pipes (13) and (23) are installed side by side, and are connected to the respective use side heat exchangers (1) and (2).
A plurality of second branch pipes (14) are connected to the suction gas pipe (32) connected to the inlet side of the compressor and to the suction side of the compressor (3).
(24) are juxtaposed, and a plurality of second control branch pipes (16) (2) are connected to a second control circuit (6) communicating with the heat source circuit (41).
6) and the second branch pipes (14) and (24)
The control branch pipes (16) and (26) are alternatively connected to the outlet side of each of the utilization side heat exchangers (1) and (2) via a selection mechanism, and the first branch pipes (12) and (26) are connected. 22) and the first control circuit (5) are provided with solenoid valves (SV1), (SV2) and (SV3), and the first control branch pipes (13) and (23) are connected to the electric two-way valve (V
1) (V2) is interposed.

Further, in the invention according to claim 3, a four-way switching valve (33) is interposed between the discharge gas pipe (31) and the suction gas pipe (32),
High pressure gas pipe for cooling and low pressure gas pipe for heating
Heat source circuit (41) and first control circuit (5) in gas pipe (34)
And a second branch pipe (14) (24) to a second gas pipe (35) that becomes a low-pressure gas pipe for cooling and a high-pressure gas pipe for heating.
And an expansion mechanism (42a) at the inlet side of the heat source side heat exchanger (4) in the heat source circuit (41) during heating.
And a check valve (42b), a parallel circuit (42) and a solenoid valve (SV6) that is closed during heating, and the inlet side and the heat source side heat exchanger of the solenoid valve (SV6) during heating. A third control circuit (7) having an electromagnetic valve (SV7) is connected between the third control circuit (7) and the outlet side at the time of heating in (4), and the first control circuit (5) is connected to the heat source circuit (41). A communication pipe (51) having an electromagnetic valve (SV8) that opens during heating is interposed between the installation circuit (42) and an inlet side during heating.

The invention according to claim 3, wherein one of the solenoid valve (SV3) interposed in the first control circuit (5) and the solenoid valve (SV8) interposed in the communication pipe (51) is an energized closed type, and It is preferable that one of the solenoid valve (SV6) interposed in the heat source circuit (41) and the solenoid valve (SV7) interposed in the third control circuit (7) is of an energized closed type.

(Operation) The plurality of utilization-side heat exchangers (1) and (2) are alternately switched in a predetermined cycle to a cooling mode as an evaporator and a heating mode as a condenser, and the temperature of the room to be air-conditioned is changed in the cycle. Since it is changed, a plurality of use-side heat exchangers (1) and (2) are arranged in a plurality of air-conditioned rooms, and the use-side heat exchangers (1) and (2) arranged in each of the air-conditioned rooms are used. By alternately switching at a predetermined cycle between a cooling mode serving as an evaporator and a heating mode serving as a condenser, the room temperature of each of the air-conditioned rooms is
At the time of cooling or at the time of heating, the temperature is switched between low temperature and high temperature. In addition, switching to low temperature is performed by using the use side heat exchanger (1) or (2) as an evaporator, and switching to high temperature is performed by Since the use side heat exchanger (2) or (1) acts as a condenser, switching from low temperature to high temperature and switching from high temperature to low temperature can be performed quickly. The time required for the room temperature to reach the set temperature in the high-temperature mode can be shortened, and therefore, the mode switching cycle time of the low-temperature mode and the high-temperature mode can be shortened while achieving a desired temperature difference without increasing the capacity. Desired, for example, 20 minutes,
You can freely set the cycle time, such as 30 minutes, to stimulate the brain by giving an appropriate stimulus through the human body surface, prevent degeneration of adaptive ability, promote its health, improve comfort This enables temperature pulsation air conditioning.

In addition, as described above, one of the user-side heat exchangers (1) and (2) to be installed in a plurality of air-conditioned rooms (in the case of three or more units, a part thereof) is used as an evaporator, and the other (three or more units). In the case of cooling operation, for example, during the cooling operation, the condensing pressure decreases, the refrigeration efficiency increases, and the use side heat exchanger (1) or (2) becomes the evaporator. Therefore, when the mode is switched from the high-temperature mode to the low-temperature mode, the temperature can be more quickly reached by the set temperature in the low-temperature mode, and the comfort for the occupants can be further improved. Further, in the temperature pulsation type air conditioner described in claim 2, while the same operational effects as those of the invention described in claim 1 are obtained by the refrigerant circuit, in particular, the first control branch pipe (13) (23) ) Is provided with an electric two-way valve (V1) (V2), so when the use side heat exchanger (1) or (2) is used as a condenser, the electric two-way valve (V1) or (V2) Thus, the flow rate of the refrigerant flowing to the use-side heat exchanger (1) or (2) serving as a condenser can be controlled, and thus the air-conditioning in which the use-side heat exchanger (1) or (2) serving as a condenser is installed. The temperature in the high-temperature mode in the target room can be freely set.

In the temperature pulsating air conditioner according to the third aspect, the refrigerant cycle is switched between the cooling operation and the heating operation by the four-way switching valve (33), so that not only during the cooling operation but also during the heating operation. The temperature of each room to be air-conditioned can be changed in the above-mentioned cycle, and the heating-side two-way valves (V1) and (V2) use the heat exchanger (1) or ( In contrast to (2), it acts as an expansion valve, and can also be used for flow control, so that a special expansion mechanism does not need to be used.

In the temperature pulsating air conditioner according to the fourth aspect, in the refrigerant circuit of the third aspect, the solenoid valve (SV3) interposed in the first control circuit (5) and the communication pipe (51) are interposed. One of the solenoid valve (SV8) and the solenoid valve (SV6) interposed in the heat source circuit (41) and the solenoid valve (SV7) interposed in the third control circuit (7). Since one of them is of the energized closed type, it is possible to prevent the occurrence of a liquid seal that blocks the refrigerant liquid in the refrigerant circuit when the operation is stopped during the cooling or heating operation.

(Example) Next, an example of the present invention will be described with reference to the drawings.

The drawing shows a heat pump type temperature pulsating air conditioner in which two air-conditioned rooms (A) and (B) are provided and these air-conditioned rooms (A) and (B) can be cooled and heated.

FIG. 1 shows a cooling operation in summer and FIG. 2 shows a heating operation in winter. As shown in FIG. 3, the low-temperature mode in each of the air-conditioned rooms (A) and (B) as shown in FIG. The set temperature is, for example, 20 ° C., and the set temperature in the high-temperature mode is, for example,
The temperature is set to 30 ° C., and the set room temperature is changed, for example, every 20 minutes.

Thus, 2 corresponding to the air-conditioned rooms (A) and (B)
The two use-side heat exchangers (1) and (2) are used, and these use-side heat exchangers (1) and (2) are connected to the respective air-conditioned rooms (A).
(B), these use-side heat exchangers (1) and (2) are combined with a compressor (3) and a heat source-side heat exchanger (4).
To the compressor (3)
By switching the four-way switching valve (33) connected to the discharge gas pipe (31) and the suction gas pipe (32), the cooling operation and the heating operation can be performed.

The first and second gas pipes (34) and (35) are connected to the switching ports of the four-way switching valve (33) to form a high-pressure gas pipe during cooling operation and a low-pressure gas pipe during heating operation. First
A heat source circuit (41) interposed with the heat source side heat exchanger (4) is connected to the gas pipe (34), and one of the expansion mechanisms (11) and (21) and the switching mechanism is connected to the heat source circuit (41). Two first branch pipes (12) and (22) having solenoid valves (SV1) and (SV2) constituting the section
And the respective use-side heat exchangers (1) and (2)
In the above, the connection is made on the inlet side during cooling and the outlet side during heating. Further, a first control circuit (5) interposed with an electromagnetic valve (SV3) bypassing the heat source side heat exchanger (4) is connected to the first gas pipe (34). Two first control branch pipes (13) and (23) are juxtaposed in the circuit (5), and these first control branch pipes (13) and (23) are connected to the use side heat exchange (1) and (2). The first branch pipe (12) (22)
The first control branch pipes (13) and (23) are connected to the connection side of, i.e., the inlet side during cooling and the outlet side during heating. V1) and (V2) are interposed.

On the other hand, two second branch pipes (14) and (24) are juxtaposed to the second gas pipe (35) which becomes a low-pressure gas pipe during the cooling operation and becomes a high-pressure gas pipe during the heating operation. A second control circuit (6) is connected to the heat source circuit (41), and two second control branch pipes (16) and (26) are arranged in parallel with the second control circuit (6). The branch pipes (14) and (24) and the second control branch pipes (16) and (26) are connected to the respective use-side heat exchangers (1) and (2).
In the above, the outlet side during cooling and the inlet side during cooling are selectively connected via a three-way solenoid valve (SV4) (SV5) constituting a selection mechanism.

Further, a parallel circuit (42) of an expansion mechanism (42a) and a check valve (42b) is provided at an inlet side of the heat source side heat exchanger (4) in the heating operation in the heat source circuit (41), and (42)
An electromagnetic valve (SV6) on the inlet side during the heating operation and closed during the heating operation, and the inlet side and the heat source side heat exchanger (4) during the heating operation of the electromagnetic valve (SV6). The third control circuit (7) between the heater and the outlet side during the heating operation
And the third control circuit (7) is provided with an electromagnetic valve (SV7), and the first control circuit (5) is provided with the electromagnetic valve (SV7).
A connecting pipe (51) is interposed between the inlet side during the heating operation of 3) and the inlet side during the heating operation of the parallel circuit (42) in the heat source circuit (41). ) Is equipped with a solenoid valve (SV8) that opens during heating operation. One of the solenoid valve (SV6) interposed in the heat source circuit (41) and the solenoid valve (SV7) interposed in the third control circuit (7) is of an energized closed type, and the first control circuit A solenoid valve (SV3) interposed in (5) and a solenoid valve (SV8) interposed in the connecting pipe (51)
One of them is an energized open type.

In FIGS. 1 and 2, (15) and (25) are fans disposed in each of the use-side heat exchangers (1) and (2).
Is a fan arranged in the heat source side heat exchanger (4),
(8) is an accumulator connected to the suction side of the compressor (3).

The operation of the temperature pulsating air conditioner of the present invention having the above-described configuration will now be described.

First, the cooling operation will be described with reference to FIG.

In FIG. 1, solid arrows indicate the air-conditioned rooms (A) and (B).
Among them, the flow direction of the refrigerant when controlling the room A to 30 ° C. and the room B to 20 ° C., and the wavy arrows are the flow directions of the refrigerant when controlling the room A to 20 ° C. and the room B to 30 ° C. The control of the flow direction of the refrigerant is performed by the solenoid valves (SV1) (SV2) (SV3) (SV
6) (SV7) (SV8), three-way solenoid valves (SV4) (SV5), and electric two-way valves (V1) (V2). These valves are controlled by a controller (not shown) at a predetermined cycle. For example, opening / closing is controlled every 20 minutes.

At the start of the cooling operation, if both the temperatures of the chambers A and B are higher than the high temperature side set temperature (30 ° C.), the use side heat exchangers (1) and (2) are both cooled as evaporators. . In this case, the discharge gas pipe (31) from the compressor (3)
The entire amount of the gas refrigerant discharged to the heat source side heat exchanger (4) is sent from the first gas pipe (34) to the heat source side heat exchanger (4) and condensed by exchanging heat. Check valve (42
b) and is sent to the first branch pipes (12) and (22) via the solenoid valve (SV6) of the heat source circuit (41), and the use side heat exchangers (1) and (2) And cools the air-conditioned rooms (A) and (B) to a predetermined temperature (for example, 25 ° C.). The refrigerant that has been heat-exchanged in each of the usage-side heat exchangers (1) and (2) is The three-way solenoid valves (SV4) and (SV5) return to the compressor (3) from the second gas pipe (35) via the second branch pipes (14) and (24). After cooling each of the air-conditioned rooms (A) and (B) to the initial temperature (for example, 25 ° C.), the air-conditioned rooms (A) and (B) are cooled to 20 ° C. and 30 ° C. every 20 minutes. The air conditioner is alternately changed to control the cooling.

First, when controlling the chamber B to 20 ° C., the solenoid valve (SV
2) Open (SV3) (SV6) and open solenoid valves (SV1) (SV7) (SV
8) is closed, and the electric two-way valve (V2) is closed, and the refrigerant condensed by the heat exchange in the heat source side heat exchanger (4) is used in the use side heat exchanger (2) installed in the chamber B. At this time, since the solenoid valve (SV3) is open, a part of the discharge gas refrigerant flowing through the first gas pipe (34) passes through the first valve via the solenoid valve (SV3). While flowing to the control circuit (5), the electric two-way valve (V2) of the first control branch pipe (23) on the B room side is fully closed, and the first control branch pipe (13) on the A room side is closed. Since the electric two-way valve (V1) is open at a predetermined opening, the discharge gas refrigerant flowing through the first control circuit (5) is supplied to the electric two-way valve (13) of the first control branch pipe (13) on the side of the A chamber. It is introduced into the use side heat exchanger (1) installed in the room A via V1), where it is condensed and the room A is heated to 30 ° C. By adjusting the opening of the electric two-way valve (V1), the air conditioning of the room A can be controlled not only to 30 ° C. but also to a desired temperature. And the use side heat exchanger (1)
The liquid refrigerant condensed in step (1) is sent from the second control branch pipe (16) via the three-way solenoid valve (SV4) to the first branch pipe (22) on the chamber B side via the second control circuit (6). And is combined with the liquid refrigerant from the heat limit side heat exchanger (4), and is used via the solenoid valve (SV2) and the expansion mechanism (21) of the first branch pipe (22). Sent to heat exchanger (2)
The air conditioning is controlled to 20 ° C.

When the temperature of the chamber A is controlled to 20 ° C., the solenoid valve (SV) of the first branch pipe (22) on the side of the chamber B as shown by the dashed arrow.
2) is closed and the solenoid valve (S) of the first branch pipe (12) on the side of the chamber A is closed.
V1) is opened, and the electric two-way valve (V1) is closed, and the electric two-way valve (V2) is opened at a predetermined opening. The heat is exchanged in the heat source side heat exchanger (4) to condense. The cooled refrigerant is sent to the use side heat exchanger (1) in the room A. At this time,
Since the solenoid valve (SV3) is open, a part of the discharge gas refrigerant flowing to the first gas pipe (34) flows to the first control circuit (5) via the solenoid valve (SV3), and A The electric two-way valve (V1) of the first control branch pipe (13) on the chamber side is fully closed, and the electric two-way valve (V2) of the first control branch pipe (23) on the chamber B side has a predetermined opening. The refrigerant gas discharged from the first control circuit (5) is opened by the first control branch pipe (23) on the chamber B side.
Is introduced into the use side heat exchanger (2) of the chamber B through the electric two-way valve (V2), and is condensed there and reaches 20 ° C.
The room is heated to 30 ° C. The liquid refrigerant condensed in the use side heat exchanger (2) is supplied to the three-way solenoid valve (SV5).
From the second control branch pipe (26) via the second control circuit (6) to the first branch pipe (12) on the A room side, and directly from the heat source side heat exchanger (3). Merges with the sent liquid refrigerant and is sent to the use side heat exchanger (1) in the A room via the solenoid valve (SV1) of the first branch pipe (12) and the expansion mechanism (11). , A room is controlled at 20 ° C. by air conditioning. As described above, by controlling the air conditioning of the room A and the room B alternately at 20 ° C. and 20 ° C. every 20 minutes, for example, the comfort in each room to be air-conditioned can be improved.

Moreover, as mentioned above, the room A and the room B are alternately set at 20 ° C and 30 ° C.
In the case of air conditioning control, the use side heat exchangers (1) and (2) installed in the chambers A and B are cooled in a cooling mode as an evaporator or heated in a heating mode as a condenser. By doing so, it is possible to control the air conditioning to 20 ° C., which is the set temperature at low temperature, or to control the air conditioning to 30 ° C., which is the set temperature at high temperature, so that the room temperature can be changed to each set temperature as shown in FIG. Therefore, the time required to reach each set temperature can be shortened.

Therefore, the temperature switching cycle between the low-temperature mode and the high-temperature mode can be set to a short time, for example, every 20 minutes, and the comfort due to the change in room temperature can be reliably realized.

Next, the heating operation in winter will be described with reference to FIG.

FIG. 2 is a view in which the four-way switching valve (33) is switched to switch from the cooling operation to the heating operation.
The solid arrows indicate the flow direction of the refrigerant when controlling the room A to 30 ° C. and the room B to 20 ° C. The wavy arrows indicate the flow direction of the refrigerant when controlling the room A to 20 ° C. and the room B to 30 ° C. I have.

At the start of the heating operation as well as at the start of the cooling, when both the A and B rooms are lower than the low temperature set temperature (20 ° C.), both the use side heat exchangers (1) and (2) are condensed. It is heated as a bowl. In this case, the total amount of gas refrigerant discharged from the compressor (3) to the discharge gas pipe (31) is
The gas is sent from the gas pipe (35) to each of the second branch pipes (14) (24), and the use-side heat exchangers (1) in the chambers A and B are passed through the three-way solenoid valves (SV4) (SV5). ) The heat is sent to (2) to exchange heat, and each air-conditioned room is heated to, for example, 25 ° C.
The liquid refrigerant condensed in the use side heat exchangers (1) and (2) is interposed in each of the first control branch pipes (13) and (23) and is in a fully open state in the electric two-way valve (V1). (V2) to the first control circuit (5), and from the communication pipe (51) connected to the first control circuit (5) via the solenoid valve (SV8) to the heat source side heat exchanger ( 4), and the refrigerant evaporated in the heat exchanger (4) is returned from the first gas pipe (34) to the compressor (3). After the air-conditioned rooms (A) and (B) are heated to a predetermined initial temperature (for example, 25 ° C.), the air-conditioned rooms (A) and (B) are heated to 20 ° C. and 30 ° C.
At the same time, the heating is controlled by making a change alternately every 20 minutes.

First, when heating the room A to 30 ° C., the solenoid valves (SV1), (SV2), (SV3), and (SV6) are closed, and the solenoid valve (SV7) is closed.
(SV8) is opened and a three-way solenoid valve (SV
5) is closed with respect to the second branch pipe (24), the electric two-way valve (V1) is fully opened, and the electric two-way valve (V2) is opened at a predetermined opening. Is sent to the use side heat exchanger (1) of the room A to perform heat exchange, and heats the room A to 30 ° C. Then, the refrigerant condensed by the heat exchange in the use side heat exchanger (1) passes through the first control branch pipe (13) from the fully opened electric two-way valve (V1) to the first control circuit ( 5) is sent to the heat source side heat exchanger (4) via the solenoid valve (SV8) of the communication pipe (51) connected to the first control circuit (5), and the heat source side heat exchange is performed. After evaporating in the vessel (4), the first gas pipe (34) returns to the compressor (3). At this time, part of the liquid refrigerant flowing from the first control branch pipe (13) to the first control circuit (5) is interposed in the first control branch pipe (23) on the side of the chamber B, and is opened at a predetermined opening. Flows through the electric two-way valve (V2), which is open at a temperature, to the use side heat exchanger (2) in the room B, and evaporates in the use side heat exchanger (2) to heat the room B to 20 ° C. It cools down. The electric two-way valve (V2) performs a throttling action. When the electric two-way valve (V2) passes through the electric two-way valve (V2), the refrigerant expands and becomes a low-pressure refrigerant and is introduced into the use-side heat exchanger (2). The electric two-way valve (V2) can also adjust the flow rate to the use side heat exchanger (2) in the B chamber by adjusting the opening degree.
Therefore, the air conditioning of the room B can be controlled not only to 20 ° C. but also to a desired temperature. Then, the evaporated liquid refrigerant flows from the second control branch pipe (26) via the three-way solenoid valve (SV5) to the heat source circuit (41) via the second control circuit (6). At this time, since the solenoid valve (SV6) of the heat source circuit (41) is in the closed state, it flows to the third control circuit (7) connected to the heat source circuit (41), passes through the solenoid valve (SV7), The first gas pipe (34) on the outlet side of the heat source side heat exchanger (4) returns to the compressor (3).

To control the heating of the room B to 30 ° C., the electric two-way valve (V2) in the room B is fully opened and the electric two-way valve (V
1) is opened at a predetermined opening, and the three-way solenoid valve (SV4) of the second branch pipe (14) on the A side is closed with respect to the second branch pipe (14). The refrigerant is sent to the use side heat exchanger (2) of the room B and exchanges heat to cool the room B to 20 ° C. and heats the room B to 30 ° C. The refrigerant condensed by the heat exchange in the use-side heat exchanger (2) flows from the fully opened electric two-way valve (V2) to the first control branch pipe (23).
From the first control circuit (5) to the heat source side heat exchanger (4) via the solenoid valve (SV8) of the communication pipe (51) connected to the first control circuit (5). After evaporating in the heat source side heat exchanger (4), the heat is returned from the first gas pipe (34) to the compressor (3). At this time, a part of the liquid refrigerant flowing from the first control branch pipe (23) to the first control circuit (5) is interposed in the first control branch pipe (13) on the side of the chamber A, and is opened at a predetermined opening. Flows to the use side heat exchanger (1) of the room A via the electric two-way valve (V1) which is opened at a temperature, and evaporates in the use side heat exchanger (1) to heat the room A to 20 ° C.
It cools down. The electric two-way valve (V1) performs a throttling function as described above, and when passing through the electric two-way valve (V1), the refrigerant expands to become a low-pressure refrigerant and becomes a low-pressure refrigerant. The electric two-way valve (V1) is introduced into 1) and evaporates. The electric two-way valve (V1) can adjust the flow rate to the use side heat exchanger (1) in the A room by adjusting the opening degree, and therefore, keeps the A room at 20 ° C. The air conditioning can be controlled to a desired temperature without limitation. Then, the evaporated liquid refrigerant flows from the second control branch pipe (16) via the three-way solenoid valve (SV4) to the heat source circuit (41) via the second control circuit (6).
At this time, since the solenoid valve (SV6) of the heat source circuit (41) is in the closed state, it flows to the third control circuit (7) connected to the heat source circuit (41), passes through the solenoid valve (SV7), The first gas pipe (34) on the outlet side of the heat source side heat exchanger (4) returns to the compressor (3).

According to the embodiment described above, the plurality of use side heat exchangers (1) and (2) are connected to the respective solenoid valves (SV1) (SV2) (SV3) (SV3).
V6) (SV7) (SV8), three-way solenoid valves (SV4) (SV5), and electric two-way valves (V1) (V2) by opening and closing control, a cooling mode that becomes an evaporator and a heating mode that becomes a condenser Since the temperatures of the air-conditioned rooms (A) and (B) are alternately switched at a predetermined cycle to change the temperature of the air-conditioned rooms (A) and (B) in the above-described period, the use-side heat exchangers (1) and (2) are changed to the air-conditioned rooms (A). (B),
The use side heat exchangers (1) and (2) arranged in the air-conditioned rooms (A) and (B) are alternately switched at a predetermined cycle between a cooling mode as an evaporator and a heating mode as a condenser. Thus, the room temperature of each of the air-conditioned rooms (A) and (B) can be switched between a low temperature and a high temperature during cooling or heating, and switching to low temperature is performed by using the use-side heat exchanger ( Since 1) or (2) is used as an evaporator and switching to a high temperature is performed by using the use side heat exchanger (2) or (1) as a condenser, switching from a low temperature to a high temperature and from a high temperature to a low temperature are performed. Can be changed quickly, that is, the time required to reach the set temperature of the room temperature in the low-temperature mode and the set temperature of the room temperature in the high-temperature mode can be shortened.
Therefore, the mode switching cycle time of the low-temperature mode and the high-temperature mode can be shortened while the desired temperature difference can be achieved without increasing the capacity, and therefore, the desired cycle time can be freely set and the temperature at which the comfort is improved. Pulsating air conditioning becomes possible.

In addition, as described above, one of the use-side heat exchangers (1) and (2) installed for each of the air-conditioned rooms (A) and (B) is an evaporator and the other is a condenser. For example, during cooling operation, the condensing pressure decreases, the refrigeration efficiency increases accordingly, and the use-side heat exchanger (1) or (2) becomes an evaporator.
Therefore, when the mode is switched from the high-temperature mode to the low-temperature mode, the temperature can be more quickly reached by the set temperature in the low-temperature mode, and the comfort for the occupants can be further improved.

Further, in the above-described embodiment, particularly, since the first control branch pipes (13) and (23) are provided with the electric two-way valves (V1) and (V2), the use-side heat exchanger (1) or ( When 2) is used as a condenser, the electric two-way valve (V1) or (V2)
Thus, the flow rate of the refrigerant flowing to the use-side heat exchanger (1) or (2) serving as a condenser can be controlled, and thus the air-conditioning in which the use-side heat exchanger (1) or (2) serving as a condenser is installed. The temperature in the high-temperature mode in the target room can be freely set.

Further, in the present embodiment, the cooling cycle and the heating operation are switched by the four-way switching valve (33) in the refrigerant cycle, so that not only the cooling operation but also the heating operation can be performed for each of the air-conditioned rooms (A).
The temperature of (B) can be changed in the above cycle, and the electric two-way valve (V1) (V2)
-Side heat exchanger (1) or (2) that becomes an evaporator
Therefore, it works as an expansion valve, and can also be used for flow rate control, so that a special expansion mechanism does not need to be used.

In the present embodiment, the solenoid valve (SV3) interposed in the first control circuit (5) and the solenoid valve (SV) interposed in the communication pipe (51)
V8) and the solenoid valve (SV6) interposed in the heat source circuit (41) and the solenoid valve (SV7) interposed in the third control circuit (7) are energized closed. Therefore, when the operation is stopped during the cooling or heating operation, it is possible to prevent the occurrence of a liquid seal that blocks the refrigerant liquid in the refrigerant circuit.

In the above-described embodiment, the air-conditioning target room is the two rooms A and B. However, the air-conditioning target room is not limited to the two rooms, and may be two.
One or more use-side heat exchangers may be disposed in each of the air-conditioned rooms in the above-described embodiment. However, the number is not limited to one in each room, and may be two or more.

(Effect of the Invention) The temperature of the room to be air-conditioned is switched by switching the plurality of use-side heat exchangers (1) and (2) alternately at a predetermined cycle between a cooling mode as an evaporator and a heating mode as a condenser. Since it is changed in a cycle, a plurality of use-side heat exchangers (1) and (2) are arranged in a plurality of air-conditioned rooms, and the use-side heat exchangers (1) and (2) arranged in each of the air-conditioned rooms. ) Is alternately switched at a predetermined cycle between a cooling mode serving as an evaporator and a heating mode serving as a condenser, so that the room temperature of each of the air-conditioned rooms is
At the time of cooling or at the time of heating, the temperature is switched between low temperature and high temperature. In addition, switching to low temperature is performed by using the use side heat exchanger (1) or (2) as an evaporator, and switching to high temperature is performed according to the above. Since the use side heat exchanger (2) or (1) acts as a condenser, it is possible to quickly switch from low temperature to high temperature and from high temperature to low temperature, that is,
The time required to reach the set temperature of the room temperature in the low-temperature mode and the set temperature of the room temperature in the high-temperature mode can be shortened, so that a desired temperature difference can be obtained without increasing the capacity. The cycle time can be shortened, the desired cycle time can be freely set, and the temperature pulsation air conditioning with improved comfort can be performed.

In addition, as described above, one of the user-side heat exchangers (1) and (2) to be installed in a plurality of air-conditioned rooms (in the case of three or more units, a part thereof) is used as an evaporator, and the other (three or more units). In the case of cooling operation, for example, during the cooling operation, the condensing pressure decreases, the refrigeration efficiency increases, and the use side heat exchanger (1) or (2) becomes the evaporator. Therefore, when the mode is switched from the high-temperature mode to the low-temperature mode, the temperature can be more quickly reached by the set temperature in the low-temperature mode, and the comfort for the occupants can be further improved.

Further, in the temperature pulsation type air conditioner described in claim 2, while the same operational effects as those of the invention described in claim 1 are obtained by the refrigerant circuit, in particular, the first control branch pipe (13) (23) ) Is provided with an electric two-way valve (V1) (V2), so when the use side heat exchanger (1) or (2) is used as a condenser, the electric two-way valve (V1) or (V2) Thus, the flow rate of the refrigerant flowing to the use-side heat exchanger (1) or (2) serving as a condenser can be controlled, and thus the air-conditioning in which the use-side heat exchanger (1) or (2) serving as a condenser is installed. The temperature in the high-temperature mode in the target room can be freely set.

In the temperature pulsating air conditioner according to the third aspect, the refrigerant cycle is switched between the cooling operation and the heating operation by the four-way switching valve (33), so that not only during the cooling operation but also during the heating operation. The temperature of each room to be air-conditioned can be changed in the above-mentioned cycle, and the heating-side two-way valves (V1) and (V2) use the heat exchanger (1) or ( In contrast to (2), it acts as an expansion valve, and can also be used for flow control, so that a special expansion mechanism does not need to be used.

In the temperature pulsating air conditioner according to the fourth aspect, in the refrigerant circuit of the third aspect, the solenoid valve (SV3) interposed in the first control circuit (5) and the communication pipe (51) are interposed. One of the solenoid valve (SV8) and the solenoid valve (SV6) interposed in the heat source circuit (41) and the solenoid valve (SV7) interposed in the third control circuit (7). Since one of them is of the energized closed type, it is possible to prevent the occurrence of a liquid seal that blocks the refrigerant liquid in the refrigerant circuit when the operation is stopped during the cooling or heating operation.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a pipe when the temperature pulsating air conditioner of the present invention is operated for cooling, FIG. 2 is an explanatory diagram of a pipe when the present invention is operated for heating, and FIG. 3 is a diagram of the present invention. FIG. 4 is a diagram showing a set temperature of the use side heat exchanger and a period switching time, FIG. 4 is a diagram showing a change in room temperature due to the period switching of FIG. 3, and FIG. 5 is a conventional example. (1) (2)… Usage side heat exchanger (11) (21)… Expansion mechanism (12) (22)… First branch pipe (13) (23)… First control branch pipe (14) (24) Second branch pipe (16) (26) Second control branch pipe (3) Compressor (31) Discharge gas pipe (32) Suction gas pipe (33) … Four-way switching valve (34)… First gas pipe (35)… Second gas pipe (4)… Heat source side heat exchanger (41)… Heat source circuit (42)… Parallel circuit (42a) ... Expansion mechanism (42b) ... Check valve (5) ... First control circuit (51) ... Connecting pipe (6) ... Second control circuit (7) ... Third control circuit (SV1) ( SV2) (SV3) (SV6) (SV7) (SV8): Solenoid valve (V1) (V2): Electric two-way valve

Claims (4)

(57) [Claims] 1. A heat exchanger comprising a plurality of use side heat exchangers (1) and (2), a heat source side heat exchanger (4) and a compressor (3), and said use side heat exchanger (1). In (2), one of a cooling mode and a heating mode of a condenser is alternately switched to a cooling mode and the other to a heating mode in a predetermined cycle, and the temperature of the room to be air-conditioned is changed in the cycle. A temperature pulsation type air conditioner comprising a switching mechanism. And a plurality of utilization side heat exchangers (1) and (2), one heat source side heat exchanger (4) and a compressor (3),
Discharge gas pipe (31) connected to the discharge side of the compressor (3)
A heat source circuit (4) in which the heat source side heat exchanger (4) is interposed.
1) and connect the expansion mechanism (1) to this heat source circuit (41).
1) A plurality of first branch pipes (12) and (22) having (21) are connected side by side to the inlet side of each of the use side heat exchangers (1) and (2), and the discharge gas pipe is connected. (31) a first control circuit (5) for bypassing the heat source side heat exchanger (4),
The control circuit (5) includes a plurality of first control branch pipes (13).
(23) and these control branch pipes (13) and (23)
A plurality of second branch pipes (14) are connected to an inlet gas pipe (32) connected to the inlet side of each of the use side heat exchangers (1) and (2) while being connected to a suction side of the compressor (3). (24) a second control circuit (6) communicating with the heat source circuit (41);
A plurality of second control branch pipes (16) and (26) are provided side by side, and these second branch pipes (14) and (24) and the second control branch pipes (16) and (2)
6) is selectively connected to the outlet side of each of the use side heat exchangers (1) and (2) via a selection mechanism, and the first branch pipes (12) and (22) are connected to a first control circuit. (5), the solenoid valves (SV1), (SV2), and (SV3) are interposed, and the first control branch pipes (13) and (23) are interposed with electric two-way valves (V1) and (V2). Temperature pulsation type air conditioner, characterized in that: 3. A four-way switching valve (33) is interposed between the discharge gas pipe (31) and the suction gas pipe (32) to provide a high-pressure gas pipe for cooling and a low-pressure gas pipe for heating. A heat source circuit (41) and a first control circuit (5) are connected to one gas pipe (34), and a second gas pipe (35) that becomes a low-pressure gas pipe during cooling and a high-pressure gas pipe during heating is connected to a second gas pipe (35). Connect the two branch pipes (14) and (24)
A parallel circuit (42) of an expansion mechanism (42a) and a check valve (42b) and a solenoid valve (SV6) to be closed during heating are provided at the inlet side of the heat source side heat exchanger (4) during heating in the heat source circuit (41). ), And a solenoid valve (SV7) is provided in a pipe between the inlet side of the solenoid valve (SV6) during heating and the outlet side of the heat source side heat exchanger (4) during heating. 3 control circuit (7), and the first control circuit (5) and the heat source circuit (41).
3. The temperature pulsating air according to claim 2, wherein a communication pipe (51) having an electromagnetic valve (SV8) that opens at the time of heating is interposed between the juxtaposed circuit (42) and the inlet side at the time of heating. Harmony equipment. 4. An electromagnetic valve (SV) interposed in a first control circuit (5).
One of the solenoid valve (SV8) interposed in the communication pipe (51) and the solenoid valve (SV6) interposed in the heat source circuit (41) and the third control circuit (7) Solenoid valve (SV
The temperature pulsation type air conditioner according to claim 4, wherein one of the above (7) and (6) is a closed type.