JPH04110549A - Temperature ripple type air conditioning device - Google Patents

Abstract

PURPOSE:To improve comfortableness by changing air conditioning temperatures in a plurality of air-conditioned rooms by alternately switching a plurality of utilization side heat exchangers at a predetermined periods to a cooling mode on one side and to a heating mode on the other side. CONSTITUTION:In the case where temperatures of rooms A and B are higher than 30 deg.C upon starting cooling operation, a gas refrigerant from a compressor 3 is condensed in a heat source side heat exchanger 4 and evaporated in utilization side heat exchangers 1, 2 to cool the air conditioning object rooms A and to 25 deg.C. After the air-conditioned rooms A and B are cooled to 25 deg.C, those rooms A and B are so controlled that they are alternately cooled to 20 and 30 deg.C for every minute. When the room b is controlled to 20 deg.C, the refrigerant condensed in the heat source side heat exchanger 4 is fed to the utilization side heat exchanger 20 of the room B. At that time, part of discharged gas refrigerant from a gas pipe 34 is introduced into the utilization side heat exchanger 1 via a solenoid valve V1, and condensed to heat the room A to 30 deg.C. The condensed fluid refrigerant merges with the fluid refrigerant from the heat source side heat exchanger 4 via a three-way solenoid valve SV4, a control branch pipe 16, and a control circuit 6 and is fed to the utilization side heat exchanger 2 via an expansion mechanism 21 to control the room B to 20 deg.C.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention aims to improve comfort by changing the air-conditioning temperature of a plurality of air-conditioned rooms, and provides moderate stimulation through the surface of the human body. The present invention relates to a temperature pulsating air conditioner which provides a temperature pulsating air conditioner.

(Prior Art) Conventionally, this type of temperature pulsating type air conditioner is described in Japanese Patent Publication No. 6i3-52297, and as shown in FIG. C) (D)
In a case (A) having a first heat exchanger (E) and a second heat exchanger (E),
A heat exchanger (F) is disposed, 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 room (H). The second heat exchanger (F) is arranged downstream of the partition plate (G), and the partition plate (G) and the second heat exchanger (F) Air conditioned room (
I) (J), and the partition plate (G) has the second
, a damper (K) that opens and closes alternately in the third air conditioning room (I) (J)
) (L), furthermore, the refrigerant outlet of the second heat exchanger (F) and the refrigerant inlet of the first heat exchanger (E) are connected in series through a communication passage CM), An outflow passage (N) is connected to the refrigerant outflow port of the heat exchanger (E), and the communication passage (M) and the outflow passage (N) are communicated by a branch passage (0), and the branch passage (0) In addition, a flow dividing valve (P) controlled by a signal from a thermistor (S1) is installed in the communication path (
M) receives a signal from the thermistor (82) (S3),
It has been proposed that a flow rate control valve (Q) controlled based on the average value of the temperatures in the second and third air conditioned rooms (I) and (J) is provided to change the air conditioning temperature.

Therefore, in the above configuration, the air taken in from the suction port (B) enters the first air conditioned room (H) after passing through the first heat exchanger (E), but the air temperature is After controlling the temperature to reach the desired first set temperature by the function of the flow dividing valve (P), this air is transferred from the first air conditioning room (H) to the second air conditioner by controlling the opening and closing of the dampers (K) and (L). The air is caused to flow alternately into one of the air conditioned room (I) and the third air conditioned room (J). At this time, the second. Since air passes through the second heat exchanger (F) and flows into the other of the third air conditioning rooms (I) and (J), the air enters the other of the third air conditioning rooms (I) and (J). There will be a difference in temperature, and as a result, the opening and closing control of the dampers (K) and (L) will cause the respective outlet ports (C) to
Air with temperature pulsations is periodically flown out from the air conditioner (CD), and the temperature of the person to be air conditioned can be changed to improve comfort during air conditioning.

(Problems to be Solved by the Invention) However, in the conventional air conditioner described above, there is a high temperature mode using the first heat exchanger (E), and a high temperature mode using the first heat exchanger (E).
E) and a low temperature mode using the second heat exchanger (F), in other words, the heat exchange area is changed instead of changing the refrigerant capacity to switch between the high temperature mode and the low temperature mode. As a result, the waste heat from the heat source (heat of condensation during cooling) is not utilized and is radiated into the outdoor atmosphere. Furthermore, it was necessary to increase the heat source capacity in proportion to the desired temperature difference.

The present invention was made in view of the above problems, and allows switching to high temperature mode and low temperature mode without increasing the capacity, allows freely setting the mode switching cycle time, and utilizes waste heat from the heat source side. It is an object of the present invention to provide a temperature pulsating air conditioner that can provide the same level of comfort while maintaining the same level of comfort.

(Means for Solving the Problem) The invention according to claim 1 provides a plurality of user-side heat exchangers (1), (2), one heat source-side heat exchanger (4), and a compressor (3). and the user-side heat exchanger (1).
(2) is characterized by comprising a switching mechanism that alternately switches between a cooling mode serving as an evaporator and a heating mode serving as a condenser at a predetermined cycle, and changes the temperature of the room to be air-conditioned at the cycle. It is something.

Further, the invention according to claim 2 provides a plurality of user-side heat exchangers (
1) (2), one heat source side heat exchanger (4) and a compressor (3), and a discharge gas pipe (31) connected to the discharge side of the compressor (3), the heat source side A heat source circuit (41) equipped with a heat exchanger (4) is connected to the heat source circuit (4).
1), a plurality of first
Branch pipes (12) (22) are arranged in parallel and connected to the inlet sides of each of the user-side heat exchangers (1) and (2), and the heat source-side heat exchanger (2) is connected to the discharge gas pipe (31). 4) is connected to the first control circuit (5) which bypasses the circuit, and to this control circuit (5),
A plurality of first control branch pipes (13) (23) are installed in parallel,
These control branch pipes (13) (23) are connected to the inlet side of each of the user-side heat exchangers (1) (2), while the suction gas pipe (32) is connected to the suction side of the compressor (3). ), a plurality of second branch pipes (14) (24) are arranged in parallel, and a plurality of second control branch pipes (16) are arranged in a second control circuit vJ (8) communicating with the heat source circuit (41). (26) are installed in parallel, and these second branch pipes (14) (24) and the second control branch pipe (16) are arranged in parallel.
) (26) are selectively connected to the outlet sides of the respective user-side heat exchangers (1) and (2) via a selection mechanism, and the first branch pipes (12) and (22) and the first A solenoid valve (SV1) (SV2) (SV3) is installed in the control circuit (5), and an electric two-way valve (V1) is installed in the first control branch pipe (13) (23).
) (V2).

Further, the invention according to claim 3 provides a four-way switching valve (33) between the discharge gas pipe (31) and the suction gas pipe (32), so that the pipe becomes a high-pressure gas pipe during cooling, and a low-pressure gas pipe during heating. The heat source circuit (4 parts) and the first control circuit (5) are connected to the first gas pipe (34), which serves as a gas pipe, and the second gas pipe serves as a low-pressure gas pipe during cooling and as a high-pressure gas pipe during heating. (35), the second branch pipe (
14) (24) and the heat source circuit (41).
) on the inlet side of the heat source side heat exchanger (4) during heating,
Parallel circuit of expansion mechanism (42a) and check valve (42b) (
42) and a solenoid valve (SVE3) that closes during heating,
and a third control circuit (7) having a solenoid valve (SV7) 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. At the same time, the first control circuit (5) and the heat source circuit (41
) between the inlet side of the parallel circuit (42) during heating, there is a connecting pipe (5) having a valve (SV8) open during heating.
1).

The invention according to claim 3, wherein the first control circuit (5)
One of the solenoid valve (SV3) installed in the connecting pipe (51) and the solenoid valve (SV8) installed in the connecting pipe (51) are closed type, and the solenoid valve csve) installed in the heat source circuit (41) and the solenoid valve (SV8) installed in the heat source circuit (41) are It is preferable that one of the solenoid valves (SV7) interposed in the control circuit (7) and the control circuit (7) is of a closed type.

(Function) The plurality of user-side heat exchangers (1) and (2) are alternately switched between a cooling mode as an evaporator and a heating mode as a condenser at a predetermined period to adjust the temperature of the room to be air-conditioned at the period. In order to By alternately switching between a cooling mode serving as an evaporator and a heating mode serving as a condenser at a predetermined cycle, the room temperature of each air-conditioned room can be switched between a low temperature and a high temperature during cooling or heating. Moreover, when switching to a low temperature, the user heat exchanger (1) or (2) is used as an evaporator, and when switching to a high temperature, the user heat exchanger (2) or (1) is used as a condenser. Therefore, it is possible to quickly switch from a low temperature to a high temperature and from a high temperature to a low temperature.In other words, the time required for the room temperature to reach the set temperature in the low temperature mode and the room temperature in the high temperature mode can be shortened. ,
Therefore, it is possible to shorten the mode switching cycle time between the low temperature mode and high temperature mode while achieving a desired temperature difference without increasing the capacity.
The cycle time, such as minutes, can be freely set, and it provides appropriate stimulation through the human body surface to activate the brain, prevent deterioration of adaptive ability, promote health, and improve comfort. This makes temperature pulsating air conditioning possible.

In addition, as described above, one of the user-side heat exchangers (1) and (2) installed in multiple air-conditioned rooms (or part of it if there are three or more) is an evaporator, and the other (three or more For example, during cooling operation, the condensing pressure decreases and the refrigeration efficiency increases accordingly, so that the user-side heat exchanger (1) or (2) functions as an evaporator. As a result, when switching from high-temperature mode to low-temperature mode, the set temperature in low-temperature mode is quickly reached and the comfort for occupants can be further improved. Further, in the temperature driven air conditioner according to claim 2, while the above-mentioned refrigerant circuit provides the same effects as the invention recited in claim IM, in particular, the first control branch pipe (13) Since the electric two-way valve (V1) (V2) is provided in (23), when the user-side heat exchanger (1) or (2) is used as a condenser, the electric two-way valve (V1) or ( v2),
Since the flow rate of the refrigerant flowing to the user-side heat exchanger (1) or (2), which serves as a condenser, can be controlled, the air-conditioned room in which the user-side heat exchanger (1) or (2), which serves as a condenser, is installed can be controlled. The temperature in the high temperature mode can be set freely.

In addition, in the temperature pulsating air conditioner according to claim 3, the refrigerant cycle is switched between cooling operation and heating operation by the four-way switching valve (33), so that not only during cooling operation but also during heating operation, The temperature of each air-conditioned room can be changed in the cycle, and during heating operation, the electric two-way valves (V1) and (V2) are used to operate the user-side heat exchanger (1) or ( 2), it acts as an expansion valve, and can also be used for flow rate control, eliminating the need for a special expansion mechanism.

Further, in the temperature pulsating air conditioner according to claim 4, in the refrigerant circuit according to claim 3, the first control circuit (5
), and one of the solenoid valve (SV8) installed in the connecting pipe (51) is a closed type, and
A solenoid valve (SVe) installed in the heat source circuit (41) and a third
Since one side of the solenoid valve (SV7) installed in the control circuit (7) is energized and closed, a liquid seal that seals off the refrigerant liquid occurs in the refrigerant circuit when the operation is stopped during cooling or heating operation. It is possible to prevent this.

(Example) Next, embodiments of the present invention will be described based on the drawings.

The drawing shows a heat pump type temperature pulsating air conditioner that has two rooms (A) and (B) to be air conditioned and is capable of cooling and heating these rooms (A) and (B).

Figure 1 shows the cooling operation in the summer, and Figure 2 shows the heating operation in the winter. The set temperature is, for example, 20° C., and the set temperature in the high temperature mode is, for example, 30° C., and the set room temperature is changed, for example, every 20 minutes.

Therefore, by using two user-side heat exchangers (1) and (2) corresponding to the air-conditioned rooms (A) and (B), each of these user-side heat exchangers (1) and (2) is Air-conditioned rooms (A) (B
), and these user-side heat exchangers (1)
(2) is connected to the compressor (3) and the heat source side heat exchanger (4) by refrigerant piping described later, and the discharge gas pipe (3 units) and suction gas pipe (32) of the compressor (3) are connected. By switching the four-way switching valve (33) connected to the air conditioner, cooling operation and heating operation can be performed.

First and second gas pipes (34) and (35) are connected to the switching boat of the four-way switching valve (33), which serves as a high-pressure gas pipe during cooling operation and a low-pressure gas pipe during heating operation. The first gas pipe (34) is connected to a heat source circuit (4) in which the heat source side heat exchanger (4) is interposed.
In 1), two first branch pipes (12) (22) each having an expansion mechanism (11) (21) and a solenoid valve (SV1) (SV2) forming a part of a switching mechanism are arranged in parallel. The inlet side of each of the user-side heat exchangers (1) and (2) during cooling is connected to the outlet side during heating. Furthermore, the first gas pipe (34) is provided with a first control circuit (5) that includes a solenoid valve (SV3) that bypasses the heat source side heat exchanger (4).
and two first control branch pipes (13) (23) are installed in parallel to this first control circuit (5), and these first control branch pipes (13) (23) are connected to the user side heat The connection side of the first branch pipes (12) and (22) in exchanges (1) and (2), that is, the population side during cooling, is connected to the outlet side during heating, and the first control branch pipe ( 13) (23) is equipped with electric two-way valves (V1) (V2) that control the flow rate of the refrigerant.

On the other hand, two second branch pipes (14) and (24) are installed in parallel to the second gas pipe (35), which becomes a low-pressure gas pipe during cooling operation and a high-pressure gas pipe during heating operation. Connect the second control circuit (6) to '5 (41) in the heat source diagram,
This second control circuit (6) has two second control branch pipes (IE
i) (26) are arranged in parallel, and the second branch pipes (14) and (2
4) and the second control branch pipes (16) and (26), a selection mechanism is configured on the outlet side during cooling and on the inlet side during heating in each of the user-side heat exchangers (1) and (2). Three-way solenoid valve (S
V4) (SV5).

Further, on the inlet side of the heat source side heat exchanger (4) in the heat source circuit (41) during heating operation, a parallel circuit (42) including an expansion mechanism (42a) and a check valve (42b), and the parallel circuit A solenoid valve (SVe) is installed on the inlet side of (42) during heating operation and closes during heating operation.
SVe) during heating operation and the outlet side of the heat source side heat exchanger (4) during heating operation.
A control circuit (7) is connected, a solenoid valve (SV7) is interposed in the third control circuit (7), and the first control circuit (5)
A communication pipe (51) is interposed between the inlet side of the solenoid valve (SV3) during heating operation and the inlet side of the parallel circuit (42) in the heat source circuit (41) during heating operation, The communication pipe (S1) is provided with a solenoid valve (SVe) that opens during heating operation. One of the solenoid valve (SVe) installed in the heat source circuit (41) and the solenoid valve (SV7) installed in the third control circuit (7) is a closed type, and the first control circuit One of the solenoid valve (SV3) installed in (5) and the solenoid valve (SVe) installed in the connecting pipe (5) is a closed type.

In addition, in FIGS. 1 and 2, (15) and (25) are fans installed in each of the user-side heat exchangers (1) and (2), and (
43) is a fan disposed in the heat source side heat exchanger (4), and (8) is a 17-kinimulator connected to the suction side of the compressor (3).

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

First, the cooling operation will be explained based on FIG. 1.

In Figure 1, the solid arrow indicates the flow direction of the refrigerant when controlling room A to 30°C and room B to 20°C among the rooms to be air conditioned (A) and (B), and the wavy arrow indicates the flow direction of the refrigerant when controlling room A to 20°C. 30 rooms
This is the flow direction of the refrigerant when controlling the temperature at
) (SV3) (SV6) (SV7) (SV8), three-way solenoid valve (SV4) (SV5), and electric two-way valve (V1) (
V2), and these multiple valves are controlled to open and close at predetermined intervals, for example every 20 minutes, by a controller (not shown).

At the start of cooling operation, if the temperatures of both rooms A and B are higher than the set temperature on the high temperature side (30°C), the user side heat exchangers (1) and (2) are used as evaporators for cooling. . In this case, from the compressor (3) to the discharge gas pipe (31
) is sent from the first gas pipe (34) to the heat source side heat exchanger (4), where it is heat exchanged and condensed, and the thus condensed liquid refrigerant is transferred to the parallel circuit (42). It passes through the check valve (42b) of the heat source circuit (41), is sent to the first branch pipe (work 2) (22) via the solenoid valve (SV6) of the heat source circuit (41), and is sent to each of the user-side heat exchangers. It evaporates in (1) and (2) to cool each air-conditioned room (A) and (B) to a predetermined temperature (for example, 25°C), and each user-side heat exchanger (1
) The refrigerant heat-exchanged in (2) passes through the three-way solenoid valve (SV
4) From (SV5), it passes through the second branch pipes (14) and (24), and is returned to the compressor (3) from the second gas pipe (35). In this way, after cooling each of the air-conditioned rooms (A) and (B) to the initial temperature (for example, 25°C), these air-conditioned rooms (A) and (B) are heated to 20°C and 30°C for 20 minutes. The air conditioner is controlled by alternating changes at each time.

First, when controlling chamber B to 20°C, the solenoid valve (
SV2) (SV3) (SVE3), and open the solenoid valve (SV
1) At the same time as setting (SV7) and (SV8), close the electric two-way valve (v2), and close the electric two-way valve (v2).
) The refrigerant that has been heat exchanged and condensed is sent to the user-side heat exchanger (2) installed in room B. At this time, since the solenoid valve (SV3) is open, the first gas pipe (
A part of the discharged gas refrigerant flowing through the solenoid valve (SV3)
B flows to the first control circuit (5) via B.
An electric two-way valve (V2) of the first control branch pipe (23) on the room side
) is fully closed, and the electric two-way valve (V1) of the first control branch pipe (13) on the side of room A is open at a predetermined opening degree, so that the discharge gas flowing through the first control circuit (5) The refrigerant is introduced into the user-side heat exchanger (1) installed in Room A through the electric two-way valve (V1) of the first control branch pipe (13) on the A room side, where it is condensed and the refrigerant flows into Room A. It is heated to 30°C. By adjusting the opening degree of the electric two-way valve (v1), room A can be air conditioned to a desired temperature, not just 30°C. The liquid refrigerant condensed in the user-side heat exchanger (1) passes through the three-way solenoid valve (SV4) to the second
The refrigerant is sent from the control branch pipe (16) through the second control circuit (θ) to the first branch pipe (22) on the B room side, where it joins with the liquid refrigerant from the heat source side heat exchanger (4). , the solenoid valve (SV2) of the first branch pipe (22) and the expansion mechanism (21
) to the user-side heat exchanger (2) in room B,
The room is air-conditioned to 20''C.

In addition, when controlling the temperature of room A to 20°C, as shown by the wavy line arrow, the solenoid valve of the first branch pipe (22) on the room B side (
SV2), open the solenoid valve (SVI) of the first branch pipe (12) on the A room side, and open the electric two-way valve (V1).
is closed, and the electric two-way valve (V2) is opened at a predetermined opening degree, and the refrigerant that has been heat exchanged and condensed in the heat source side heat exchanger (4) is transferred to the user side heat exchanger (1) in room A. At this time, since the solenoid valve (SV3) is open, a part of the discharged gas refrigerant flowing into the first gas pipe (34) is sent to the first gas pipe via the solenoid valve (SV-3). 1 control circuit (5)
The electric two-way valve (■1) of the first control branch pipe (13) on the side of room A is fully closed, and the electric two-way valve (1) of the first control branch pipe (23) on the side of room B is fully closed. V2) is opened at a predetermined opening degree, the discharged gas refrigerant from the first control circuit (5) flows into the B room via the electric two-way valve (V2) of the first control branch pipe (23) on the B room side. It is introduced into the user-side heat exchanger (2), where it condenses and heats room B, which is at 20°C, to 30°C. The liquid refrigerant condensed in the user-side heat exchanger (2) is then passed from the second control branch pipe (26) to the second control circuit (6) via the three-way solenoid valve (SV5).
The liquid refrigerant is sent to the first branch pipe (12) on the room side and joins with the liquid refrigerant sent directly from the heat source side heat exchanger (3),
It is sent to the user-side heat exchanger (1) of room A through the solenoid valve (SVI) of the first branch pipe (12) and the expansion mechanism (11), and air-conditions room A at 20°C. be. As mentioned above, room A and room B are heated to 20°C alternately every 20 minutes, for example.
By controlling the air conditioning to 30°C and 30°C, comfort in each air-conditioned room can be improved.

Moreover, as mentioned above, chambers A and B are alternately heated at 20°C and 30°C.
°C, the user-side heat exchangers (1) and (2) installed in rooms A and B are cooled in a cooling mode to act as an evaporator, or heated in a heating mode to act as a condenser. By heating, the air conditioning can be controlled to 20°C, which is the set temperature at low temperatures, or 30°C, which is the set temperature at high temperatures.As shown in Figure 4, the room temperature can be adjusted to each set temperature. In addition to being able to change the temperature, the time it takes to reach each set temperature can be made faster.

Therefore, the temperature switching cycle for low temperature mode and high temperature mode is
For example, it can be set for a short time, such as every 20 minutes,
This makes it possible to reliably achieve comfort through changes in room temperature.

Next, heating operation in winter will be explained based on FIG. 2.

FIG. 2 shows the four-way switching valve (33) switched from the cooling operation to the heating operation.
The solid arrow indicates the flow direction of the refrigerant when controlling room A to 30°C and room B to 20°C, and the wavy arrow indicates the direction of refrigerant flow when controlling room A to 20°C and room B to 30°C. ing.

At the start of heating operation, as well as at the start of cooling, the rooms A and B
When both rooms are lower than the set temperature on the low-temperature side (20° C.), heating is performed using both the user-side heat exchangers (1) and (2) as condensers. In this case, the entire amount of gas refrigerant discharged from the compressor (3) to the discharge gas pipe (31) is transferred from the second gas pipe (35) to each of the second branch pipes (14) (24).
) to the user-side heat exchangers (1) (2) of room A and room B via the three-way solenoid valves (SV4) (SV5).
The liquid refrigerant condensed in the user-side heat exchangers (1) and (2) is sent to each of the first control branch pipes for heat exchange and heats each air-conditioned room to, for example, 25"C. (13)(
23) is installed in the electric two-way valve (V
1) (V2) to the first control circuit (5), and from the communication pipe (51) connected to the first control circuit (5) to the heat source side heat exchange via the solenoid valve (SV8). The refrigerant evaporated in the heat exchanger (4) is returned to the compressor (3) from the first gas pipe (34). In this way, after each air-conditioned room (A) (B) is heated to a predetermined initial temperature (for example, 25°C), each air-conditioned room (A) (B) is heated to 20°C and 30°C. , 20
The heating is controlled by alternating changes every minute.

First, when controlling the heating of room A to 30°C, the mold 11 (
SV1) (SV2) (SV3) (SV6) are closed, solenoid valves (SV7) (SV8) are opened, and the three-way solenoid valve (SV5) provided on the B chamber side is closed for the second branch pipe (24). state, and fully open the electric three-way valve (V1),
The electric two-way valve (V2) is opened to a predetermined degree, and the discharged gas refrigerant is sent to the user-side heat exchanger (1) of room A for heat exchange, and the heating of room A is controlled to 30°C. be. and,
The refrigerant condensed through heat exchange in the user-side heat exchanger (1) passes from the fully opened electric two-way valve (V1) to the first control branch pipe (L3) and then to the first control circuit (5). from the first
It is sent to the heat source side heat exchanger (4) via the solenoid valve (SV8) of the communication pipe (51) connected to the control circuit (5), and is evaporated in the heat source side heat exchanger (4). After that,
It returns to the compressor (3) from the first gas pipe (34). At this time, a 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 B room side, and is opened at a predetermined time. The flow flows to the user-side heat exchanger (2) in room B via the electric two-way valve (v2) that is open at
) to evaporate and cool chamber B to 20°C. Note that the electric two-way valve (V2) performs a throttling action, and when passing through this electric two-way valve (V2), the refrigerant expands and becomes a low-pressure refrigerant that is introduced into the user-side heat exchanger (2). By adjusting the opening degree of the electric two-way valve (v2), the flow rate to the user-side heat exchanger (2) in room B can be adjusted. The temperature can be controlled by air conditioning. The evaporated liquid refrigerant then flows through the three-way solenoid valve (SV5) to the second control branch pipe (2).
e) through the second control circuit (6) to the heat source circuit (
41). At this time, the heat source circuit (4
1) Since the solenoid valve (SV6) is closed, the heat source circuit (
41), passes through a solenoid valve (SV7), and the compressed gas flows from the first gas pipe (34) on the outlet side of the heat source side heat exchanger (4). Return to machine (3).

In addition, when controlling the heating of room B to 30°C, the electric two-way valve (V2) on the side of room B is fully opened, the electric two-way valve (V1) on the side of room A is opened at a predetermined opening, and Connect the three-way solenoid valve (SV4) of the second branch pipe (14) on the A room side to the second branch pipe (
14) is made into a closed state, and the discharged gas refrigerant is sent to the user-side heat exchanger (2) in room B and exchanges heat at 20°.
Room B, which is currently cooled to temperature C, is heated to 30°C.

Then, the refrigerant condensed through heat exchange in the user-side heat exchanger (2) is transferred from the fully opened electric two-way valve (■2) to the first
The communication pipe (51) connects from the first control circuit (5) to the first control circuit (5) via a control branch pipe (z3).
The heat source side heat exchanger (4) via the solenoid valve (SV8)
After being evaporated in the heat source side heat exchanger (4), it is sent from the first gas pipe (34) to the compressor (3).
I'm going back to that. At this time, the first control branch pipe (23
) flowing from the first control circuit (5) to the first control branch pipe (13) on the A room side, a part of the liquid refrigerant flows through an electric two-way valve (v1 ) to the user-side heat exchanger (1) in room A, where it evaporates and cools room A to 20''C.

Note that the electric two-way valve (V1) performs a throttling action as described above, and when passing through this electric two-way valve (V1), the refrigerant expands and becomes a low-pressure refrigerant, which is then transferred to the user-side heat exchanger ( 1) and is evaporated, the electric two-way valve (v1
) can adjust the flow rate to the user-side heat exchanger (1) of room A by adjusting the opening, and therefore the air conditioning of room A can be controlled to a desired temperature, not just 20°C. The evaporated liquid refrigerant then flows from the second control branch pipe (16) to the second control circuit (6) to the heat source circuit (41) via the three-way solenoid valve (sV4). At this time, since the solenoid valve (SVE3) of the heat source circuit (41) is in the closed state, the third control circuit (
7), passes through a solenoid valve (SV7), and returns to the compressor (3) from the first gas pipe (34) on the outlet side of the heat source side heat exchanger (4).

According to the embodiment described above, a plurality of user-side heat exchangers (
1) (2) for each of the solenoid valves (SV1) (SV2) (SV
3) (SV6) (SV7) (SV8), three-way solenoid valve (S
V4) (SV5), and the two-way valves (V1) and (V2) are switched alternately between the cooling mode, which functions as an evaporator, and the heating mode, which functions as a condenser, at a predetermined period to control the air conditioning in the room being air-conditioned. Since the temperatures of (A) and (B) are changed in the above-mentioned period, each of the user-side heat exchangers (1) and (2) is placed in the air-conditioned rooms (A) and (B), and each of these air-conditioned rooms is Room (A)
(B) The user-side heat exchangers (1) and (2) placed in
By alternately switching between the cooling mode as an evaporator and the heating mode as a condenser at a predetermined period, the room temperature of each of the air-conditioned rooms (A) and (B) can be kept at a low temperature during cooling or heating. In addition, the switching to a low temperature is performed by the user-side heat exchanger (1) or (2).
is used as an evaporator, and the switching to high temperature is performed by the user-side heat exchanger (
2) or (1) acts as a condenser, so it is possible to quickly switch from low temperature to high temperature and from high temperature to low temperature, that is, the room temperature setting in low temperature mode and the room temperature setting in high temperature mode The time required to reach the temperature can be shortened, and the desired temperature difference can be achieved without increasing the capacity, while the mode switching cycle time between the low temperature mode and high temperature mode can be shortened.
The desired cycle time can be freely set, and temperature pulsating air conditioning with improved comfort becomes possible.

In addition, as described above, one of the user-side heat exchangers (1) and (2) installed in each of the air-conditioned rooms (A) and (B) is used as an evaporator, and the other is used as a condenser. For example, during cooling operation, the condensing pressure decreases, the refrigeration efficiency increases accordingly, and the evaporation capacity of the user-side heat exchanger (1) or (2), which acts as an evaporator, can be improved. When switching to the low temperature mode, the set temperature can be reached more quickly than in the low temperature mode, and the comfort for the occupants can be further improved.

Moreover, in the above-mentioned embodiment, in particular, since the electric two-way valves (v1) (V2) are provided in the first control branch pipes (13) (23), the user-side heat exchanger (1) or ( 2) is used as a condenser, the electric two-way valve (V1) or (v2) controls the usage-side heat exchanger (
Since the flow rate of the refrigerant flowing to 1) or (2) can be controlled, the user-side heat exchanger (1) or (2), which serves as a condenser,
This allows you to freely set the temperature in the high-temperature mode in the air-conditioned room where the system is installed.

In addition, in this embodiment, the refrigerant cycle is switched between cooling operation and heating operation by the four-way switching valve (33), and each air-conditioned room (A) is controlled not only during cooling operation but also during heating operation.
The temperature of the electric two-way valve (V1) (V
2), the user side heat exchanger (1) or (
2), it acts as an expansion valve, and can also be used for flow rate control, eliminating the need for a special expansion mechanism.

Further, in this embodiment, one of the solenoid valve (SV3) installed in the first control circuit (5) and the solenoid valve (SV8) installed in the communication pipe (51) is a closed type, and the heat source circuit(
41), the solenoid valve (SV6) installed in the third control circuit (
Since one side of the solenoid valve (SV7) installed in 7) is a closed type, it is possible to prevent a liquid seal from forming in the refrigerant circuit when stopping the operation during cooling or heating operation. It is possible.

In addition, in the above embodiment, the two rooms to be air-conditioned are room A and room B, but the number of rooms to be air-conditioned is not limited to two, but may be two or more, and in the above embodiment, Although one user-side heat exchanger is disposed in each room to be air-conditioned, the number is not limited to one in each room, but two or more may be used.

(Effect of the invention) The temperature of the room to be air-conditioned is maintained at the temperature of the room to be air-conditioned by alternately switching the plurality of user-side heat exchangers (1) and (2) between the cooling mode, which acts as an evaporator, and the heating mode, which acts as a condenser, at a predetermined period. Since the change is made periodically, a plurality of user-side heat exchangers (1) (2) are arranged in a plurality of rooms to be air-conditioned, and the user-side heat exchangers (1) (2) arranged in each of these rooms to be air-conditioned are ) is alternately switched between a cooling mode as an evaporator and a heating mode as a condenser at a predetermined cycle, the room temperature of each air-conditioned room can be changed to a low temperature or a high temperature during cooling or heating. Moreover, when switching to a low temperature, the user side heat exchanger (1) or (2) is used as an evaporator, and when switching to a high temperature, the user side heat exchanger (2) or (1) is used as an evaporator. Since it acts as a condenser, it can quickly switch from low temperature to high temperature and from high temperature to low temperature.
The time required for the room temperature to reach the set temperature in the low-temperature mode and the set temperature in the high-temperature mode can be shortened. Therefore, the mode switching between the low-temperature mode and the high-temperature mode can be achieved while achieving the desired temperature difference without increasing the capacity. The cycle time can be shortened, so the desired cycle time can be freely set, and temperature pulsation chatter with improved comfort becomes possible.

In addition, as described above, one of the user-side heat exchangers (1) and (2) installed in multiple air-conditioned rooms (or part of it if there are three or more) is an evaporator, and the other (three or more For example, during cooling operation, the condensing pressure decreases and the refrigeration efficiency increases accordingly, so that the user-side heat exchanger (1) or (2) functions as an evaporator. As a result, when switching from high-temperature mode to low-temperature mode, the set temperature in low-temperature mode can be reached more quickly, and comfort for occupants can be further improved.

Further, in the temperature pulsating air conditioner according to claim 2, while the same effects as those of the invention according to claim 1 are obtained by the refrigerant circuit, in particular, the first control branch pipe (
13) Since electric two-way valves (V1) and (V2) are provided in (23), when the user-side heat exchanger (1) or (2) is used as a condenser, the electric two-way valve (■1 ) or (V2), the user-side heat exchanger (1
) or (2) can be controlled.
The temperature in the high temperature mode in the air-conditioned room in which the user-side heat exchanger (1) or (2) serving as the condenser is installed can be freely set.

In addition, in the temperature pulsating air conditioner according to claim 3, the refrigerant cycle is switched between cooling operation and heating operation by the four-way switching valve (33), so that not only during cooling operation but also during heating operation, The temperature of each air-conditioned room can be changed in the above-mentioned period, and during heating operation, the electric two-way valve (■1) (V2) causes the user-side heat exchanger (1) to function as an evaporator. Alternatively, in contrast to (2), it acts as an expansion valve, so it can also be used for flow rate control and there is no need to use a special expansion mechanism.

Further, in the temperature pulsating air conditioner according to claim 4, in the refrigerant circuit according to claim 3, the first control circuit (5
), and one of the solenoid valve (SV8) installed in the connecting pipe (51) is a closed type, and
A solenoid valve (SV6) installed in the heat source circuit (41) and a third
Since one side of the solenoid valve (SV7) installed in the control circuit (7) is energized and closed, a liquid seal that seals off the refrigerant liquid occurs in the refrigerant circuit when the operation is stopped during cooling or heating operation. It is possible to prevent this.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of piping showing the temperature pulsating air conditioner of the present invention in cooling operation, Fig. 2 is an explanatory diagram of piping showing the heating operation of the invention, and Fig. 3 is an explanatory diagram of piping showing the temperature pulsating air conditioner of the present invention in cooling operation. FIG. 4 is a diagram showing the set temperature of the user-side heat exchanger and cycle switching time, FIG. 4 is a diagram showing room temperature changes due to cycle switching in FIG. 3, and FIG. S is a conventional example. (1) (2)... Utilization side heat exchanger (11) (21)... Expansion mechanism (12) (22)... First branch pipe (13) (23)...・First control branch pipe (14) (2
4)... 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)...Dwarf circuit (42a)...Expansion mechanism (42b)...Check valve (5)...First control circuit (51) ...Communication pipe (6) ...Second control circuit (7) ...Third control circuit (SV1) (SV2) (SV3) (SV6) (SV7) (SV8) ...Electromagnetic Valve (V1) (V2) ・Electric two-way valve

Claims (1)

[Claims] 1) A plurality of user side heat exchangers (1) (2), one heat source side heat exchanger (4) and a compressor (3), and
The user-side heat exchangers (1) and (2) are alternately switched between a cooling mode as an evaporator and a heating mode as a condenser at a predetermined period, and one is alternately switched to a cooling mode and the other is a heating mode, and the air conditioning target is A temperature pulsating air conditioner characterized by comprising a switching mechanism that changes the temperature of the room in the period. 2) A discharge outlet that includes a plurality of user-side heat exchangers (1) (2), one heat source-side heat exchanger (4), and a compressor (3), and is connected to the discharge side of the compressor (3). A heat source circuit (41) having the heat source side heat exchanger (4) interposed therein is connected to the gas pipe (31), and an expansion mechanism (11) is connected to the heat source circuit (41).
A plurality of first branch pipes (12) (22) with (21) are arranged in parallel and connected to the inlet side of each of the user side heat exchangers (1) (2), and the discharge gas pipe (31 ) is connected to a first control circuit (5) that bypasses the heat source side heat exchanger (4), and a plurality of first control branch pipes (1) are connected to this control circuit (5).
3) (23) are installed in parallel, and these control branch pipes (13) (
23) is connected to the inlet side of each of the user-side heat exchangers (1) and (2), and a plurality of second branches are connected to the suction gas pipe (32) connected to the suction side of the compressor (3). Pipe (14) (2
4) are arranged in parallel, and a plurality of second control branch pipes (16) (
26) are installed in parallel, and these second branch pipes (14) (24)
and a second control branch pipe (16) (26) are selectively connected to the outlet side of each of the user-side heat exchangers (1) and (2) via a selection mechanism, and the first branch pipe ( 12) Solenoid valves (SV1) (SV2) are connected to (22) and the first control circuit (5).
(SV3), and the first control branch pipe (13) (2
3) A temperature pulsating air conditioner characterized in that electric two-way valves (V1) (V2) are interposed therein. 3) A four-way switching valve (33) is interposed between the discharge gas pipe (31) and the suction gas pipe (32), so that the first gas pipe becomes a high-pressure gas pipe during cooling and a low-pressure gas pipe during heating. The heat source circuit (41) and the first control circuit (5) are connected to (34), and a second branch pipe is connected to the second gas pipe (35), which becomes a low-pressure gas pipe during cooling and a high-pressure gas pipe during heating. (14) In addition to connecting (24), a parallel circuit including an expansion mechanism (42a) and a check valve (42b) is connected to the inlet side of the heat source side heat exchanger (4) in the heat source circuit (41) during heating. (42) and a solenoid valve (SV6) that closes during heating, and an inlet side of the solenoid valve (SV6) during heating and an outlet side of the heat source side heat exchanger (4) during heating. A third control circuit (7) having a solenoid valve (SV7) is connected therebetween, and the first control circuit (
5) and the parallel circuit (4) in the heat source circuit (41).
2) between the inlet side during heating and the solenoid valve (S) that opens during heating.
Claim 2 wherein a connecting pipe (51) having a V8) is interposed.
The temperature pulsating air conditioner described above. 4) One of the solenoid valve (SV3) installed in the first control circuit (5) and the solenoid valve (SV8) installed in the communication pipe (51) is a closed type, and one of the solenoid valves (SV8) installed in the first control circuit (5) is a closed type, and 5. The temperature pulsating air conditioner according to claim 4, wherein one of the solenoid valve (SV6) installed in the third control circuit (7) and the solenoid valve (SV7) installed in the third control circuit (7) is a closed type.