JPH0366582B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cooling/heating dehumidifier, and particularly to improving the performance thereof.

[Conventional technology]

FIG. 3 shows a refrigerant circuit of a conventional heating/cooling dehumidifier. In the figure, 1 is a compressor, 2 is a cooling/heating switching valve, 3 is an outdoor heat exchanger, 4 is an outdoor blower that blows air to the outdoor heat exchanger 3, 5 is a first throttle device,
Cooling throttle circuit 5 formed by the first throttle 52a
2. The first aperture 52a and the second aperture 51a
The first bypass circuit 5a is connected in parallel to each of the above-mentioned aperture circuits. 54 and 55 are second bypass circuits provided in the first bypass circuit 5a, respectively.
a check valve and a first solenoid valve. Further, 53 is a first check valve provided in parallel with the second throttle 51a. 6 is an indoor second heat exchanger, 7 is an indoor first heat exchanger, and 8 is an indoor blower that blows air to the indoor first heat exchanger 7 and the indoor second heat exchanger 6. 9
is the second aperture device, the third aperture 91, the third aperture device
It is comprised of a check valve 92, a fourth check valve 93, and a second electromagnetic valve 94. Reference numeral 10 denotes an accumulator, which are connected to each other by refrigerant piping as shown in FIG.

Next, the operation will be explained based on the refrigerant circuit shown in FIG. 3 and the equipment operation table shown in FIG. 4. First, the cooling operation will be explained. In FIG. 3, the direction of refrigerant flow during cooling is indicated by thick solid line arrows. The high temperature and high pressure gas refrigerant discharged from the compressor 1 is passed through the cooling/heating switching valve 2.
It exchanges heat with the air supplied by the outdoor blower 4 in the outdoor heat exchanger 3, condenses and liquefies itself, and is supplied to the throttling device 5. The air then passes through the first check valve 53 and is depressurized in the cooling throttle circuit 52. Then, the indoor air blower 8 is connected to the indoor second heat exchanger 6.
The second solenoid valve 94 is evaporated by exchanging heat with the conditioned air supplied by the air conditioner, and is open at this time.
It passes through the fourth check valve 93 and reaches the indoor first heat exchanger 7. Here, it further evaporates and returns to the compressor 1 through the cooling/heating switching valve 2 and the accumulator 10. By cooling the conditioned air, the room is cooled.

Next, the heating operation will be explained. In FIG. 3, the direction of refrigerant flow during heating is indicated by thick broken line arrows. The high-temperature, high-pressure gas refrigerant discharged from the compressor 1 passes through the air conditioning/heating switching valve 2, and then enters the indoor first heat exchanger 7.
It exchanges heat with relatively low-temperature conditioned air supplied by the indoor blower 8 and warms the conditioned air, and at the same time condenses itself and passes through the third check valve 92.
It reaches the indoor second heat exchanger 6. Here, it exchanges heat with relatively high-temperature indoor air warmed by the first indoor heat exchanger 7, further warming the conditioned air, and at the same time further condenses itself, reaching the first expansion device 5. And the second aperture 51a and the first aperture 5
The air pressure is reduced in a heating aperture circuit 51 composed of 2a, and heat is exchanged with air supplied by an outdoor blower 4 in an outdoor heat exchanger 3. It evaporates and returns to the compressor 1 through the cooling/heating switching valve 2 and the accumulator 10.

Next, the dehumidifying operation will be explained. In FIG. 3, the flow direction of the refrigerant during dehumidification is indicated by a white arrow. The high-temperature, high-pressure gas refrigerant discharged from the compressor 1 passes through the air conditioning/heating switching valve 2 and is supplied to the outdoor heat exchanger 3, but since the outdoor blower 4 is stopped, there is some natural heat dissipation, but almost no condensation occurs. The air passes through the first solenoid valve 55 and the second check valve 54 and is supplied to the indoor second heat exchanger 6, where it is cooled and dehumidified in the indoor first heat exchanger 7. Exchanges heat with conditioned air,
At the same time as it heats the conditioned air, it condenses and liquefies itself. Then, the pressure is reduced by the third throttle 91 of the second throttle device 9 and reaches the indoor first heat exchanger 7 . There, the air to be conditioned is cooled and dehumidified, and at the same time it evaporates and returns to the compressor 1 through the air conditioning/heating switching valve 2 and the accumulator 10. Normally, when comparing the amount of heat radiated by the second indoor heat exchanger 6 and the amount of heat collected by the first indoor heat exchanger 7, considering the thermodynamic heat balance, the amount of heat radiated by one compressor input is radiated. Since the amount of heat is large, the indoor air will be heated. (This method is generally referred to as heating dehumidification.) Finally, the defrosting operation will be explained. The refrigerant flow direction is the same as the thick solid line arrow (flow direction during cooling) in FIG. The high-temperature, high-pressure gas refrigerant discharged from the compressor 1 enters the frosted outdoor heat exchanger 3, melts the frost, and condenses and liquefies itself. Normally, the outdoor blower 4 is stopped in order to prevent heat radiation to the atmosphere and to perform efficient defrosting. Thereafter, the pressure is reduced at the first throttle 52a, evaporated at the second indoor heat exchanger and the first indoor heat exchanger 6, and returned to the compressor 1. but,
Since cold air circulates indoors when the indoor blower 8 is operated, the cold air is stopped (the operation of the indoor blower 8 is stopped). Therefore, the evaporation performance is poor and the low pressure is lowered, so the compressor 1 cannot fully demonstrate its capacity and the defrosting time is long.

Also, as shown in the equipment operation table shown in Figure 4, when the thermostat is stopped, compressor 1, indoor and outdoor blowers 8 and 4
has stopped.

[Problem that the invention seeks to solve]

Since the conventional air-conditioning/heating dehumidifier is configured as described above, during cooling operation, the refrigerant whose pressure is reduced in the first throttling device 5 evaporates through the indoor second heat exchanger 6, and then the refrigerant is evaporated through the second indoor heat exchanger 6. 9, indoor first
Since the refrigerant is further evaporated in the heat exchanger 7, the pressure loss on the refrigerant side is large, and the low-pressure pressure is reduced, resulting in insufficient capacity of the compressor 1 and a decrease in efficiency.

In addition, during heating operation, the high-temperature, high-pressure gas refrigerant discharged from the compressor 1 condenses in the indoor first heat exchanger 7, warms the air to be conditioned, and condenses and liquefies itself, and then enters the indoor first heat exchanger 7. Since the relatively warm air to be conditioned is further heat exchanged with the relatively cool condensed refrigerant in the heat exchanger 6, it is impossible to heat the air to be conditioned to a high temperature, and the refrigerant is Since the flow direction was a parallel flow heat exchange relationship, the heat exchange efficiency was poor.

During defrosting operation, the condensation effect in the outdoor heat exchanger 3 increases due to frost formation, and the high pressure decreases, making it difficult for the refrigerant to flow, reducing the refrigerant supply to the low pressure side, and reducing the cold air stop mechanism. As a result, it becomes even more difficult for the refrigerant to evaporate, resulting in an extreme drop in low pressure, making it impossible for the compressor 1 to fully utilize its capacity, resulting in problems such as a long defrosting time.

This invention was made to solve the above-mentioned problems, and aims to provide an air-conditioning/heating dehumidifier that can improve air-conditioning performance and perform efficient defrosting operation.

[Effect]

In the air-conditioning/heating dehumidifier of this invention, during heating operation, the high-temperature refrigerant discharged from the compressor is supplied to the indoor second and first heat exchangers in this order, while the conditioned air is supplied to the indoor first and second heat exchangers. Since the countercurrent heat exchange relationship is established in which the air is supplied to the exchanger in order and heat is exchanged, the temperature of the conditioned air can be raised relatively high, and the heat exchange efficiency can be increased.

During cooling operation, the refrigerant is divided and supplied to the first and second indoor heat exchangers, so the refrigerant pressure loss can be kept small and the low pressure can be maintained relatively high, increasing the capacity of the compressor. Efficiency can be increased.

Also, during defrosting operation, a part of the refrigerant discharged from the compressor is transferred to the fifth
The refrigerant passes through the solenoid valve, mixes with the refrigerant returning from the indoor first and second heat exchangers, and returns to the compressor, increasing the low-pressure pressure, allowing the compressor to reach its full potential and shortening the defrosting time. be able to.

[Means for solving problems]

The air conditioning and heating dehumidifier according to this invention includes a compressor, a cooling and
A flow of conditioned air supplied by a heating switching valve, an outdoor heat exchanger, a first throttling device having a cooling and heating throttling circuit and a first bypass circuit connected in parallel to this throttling circuit, and an indoor blower. In the case where the first indoor heat exchanger located on the windward side, the second indoor heat exchanger and the second expansion device located on the leeward side thereof are connected by refrigerant piping to form a closed loop, the above-mentioned A second bypass circuit is provided that connects the discharge side refrigerant pipe and the suction side refrigerant circuit of the compressor, and during heating operation, the refrigerant discharged from the compressor passes through the cooling/heating switching valve to the indoor pipe. 2. It is supplied to the first heat exchanger in order and is condensed and liquefied, further depressurized in the heating throttle circuit, evaporated and vaporized in the outdoor heat exchanger, and then passed through the cooling/heating switching valve to the compressor. During cooling operation, the refrigerant discharged from the compressor is supplied to the outdoor heat exchanger via the cooling/heating switching valve to condense and liquefy, and is further depressurized in the cooling throttle circuit. A refrigerant circuit in which the liquid refrigerant is dividedly supplied to the first and second indoor heat exchangers, evaporated, and then returned to the compressor via the cooling/heating switching valve; The refrigerant discharged from the refrigerant is supplied to the indoor second heat exchanger via the cooling/heating switching valve, the outdoor heat exchanger, and the first bypass circuit, where it is condensed and liquefied.
The refrigerant circuit is reduced in pressure by the throttling device, evaporated in the first indoor heat exchanger, and returned to the compressor via the cooling/heating switching valve, and the refrigerant discharged from the compressor during defrosting operation. A part of the refrigerant returns to the compressor via the second bypass circuit, and most of the discharged refrigerant is supplied to the outdoor heat exchanger via the cooling/heating switching valve and is condensed and liquefied, Furthermore, a refrigerant circuit in which the liquid refrigerant whose pressure is reduced in the cooling throttle circuit is divided and supplied to the indoor first and second heat exchangers, and after being evaporated and vaporized, returns to the compressor via the cooling/heating switching valve. The above object is achieved by constructing an air-conditioning/heating dehumidifier by providing a switching valve that selectively switches between the two.

〔Example〕

An embodiment of the present invention will be described below.
FIG. 1 is a refrigerant circuit diagram of the air-conditioning/heating dehumidifier of the present invention, in which 1 is a compressor, 2 is an air-conditioning/heating switching valve, and 3
4 is an outdoor heat exchanger, 4 is an outdoor blower that blows air to the outdoor heat exchanger 3, 5 is a first throttle device, and a cooling throttle circuit 52 formed by the first throttle 52a, the first throttle 52a. and a heating aperture circuit 51 formed by a second aperture 51a, and a first bypass circuit 5a connected in parallel to each of the above aperture circuits. 54 and 55 are a second check valve and a first electromagnetic valve, respectively, provided in the first bypass circuit 5a. Also, 53 is the second
This is a first check valve provided in parallel with the throttle 51a. 6 is an indoor second heat exchanger, 7 is an indoor first heat exchanger, and 8 is an indoor blower that supplies conditioned air to the indoor first heat exchanger 7 and the indoor second heat exchanger 6. 9 is a second aperture device, and a third aperture device 9
1 and a second electromagnetic valve 94. 1
0 is the accumulator. Reference numeral 60 indicates a third solenoid valve provided in a pipe connecting the first expansion device 5 and one end of the indoor first heat exchanger 7, and reference numeral 61 indicates a third electromagnetic valve provided between the other end of the indoor second heat exchanger 6 and the indoor first heat exchanger 7. a fourth solenoid valve provided in the pipe connecting the other end of the heat exchanger 7;
62 is a fifth electromagnetic valve provided in a second bypass circuit 83 that bypasses the discharge refrigerant pipe 81 of the compressor 1 and the inlet refrigerant pipe 82 of the accumulator 10; 71 is a fifth solenoid valve that connects the first throttle device 5 and the indoor A fifth check valve 72 installed in the pipe connecting one end of the second heat exchanger 6 is branched from the pipe between the fourth solenoid valve 61 and the other end of the indoor first heat exchanger 7. , a sixth check valve provided in the return pipe to the heating and cooling switching valve 2, 7
3 is a seventh check valve provided on the second heat exchanger 6 side in the refrigerant pipe connecting the air conditioning/heating switching valve 2 and one end of the indoor second heat exchanger 6; The switching valves for switching the refrigerant circuit formed during each defrosting operation are the first to fifth solenoid valves 55 and 9.
4, 60, 61, 62, and heating/cooling switching valves 2, each of which is connected to form a closed loop by refrigerant piping as shown in FIG.

Next, regarding the operation, the refrigerant circuit diagram in Figure 1 and the Figure 2
The explanation will be based on the equipment operation table shown in the figure. First, cooling operation will be explained. In FIG. 1, the direction of refrigerant flow during cooling is indicated by thick solid arrows. The high-temperature, high-pressure gas refrigerant discharged from the compressor 1 passes through the air conditioning switching valve 2 and exchanges heat with the air supplied by the outdoor blower 4 in the outdoor heat exchanger 3. Sent out. The air then passes through the first check valve 53 and is depressurized in the cooling throttle circuit 52 formed by the first throttle 52a. The refrigerant is guided to the outdoor second heat exchanger 6 through the fifth check valve 71, and the refrigerant is guided to the indoor first heat exchanger 7 through the third solenoid valve 60, which is open at this time. The air is divided into the first indoor heat exchanger 7 and the second indoor heat exchanger 6, respectively, to exchange heat with the conditioned air supplied by the indoor blower 8, and evaporate. It passes through the accumulator 10 and returns to the compressor 1. The room is then cooled by cooling the conditioned air. In addition, during cooling, the indoor first and indoor second heat exchangers 7 and 6 are placed in a parallel position, so the pressure loss on the refrigerant evaporation side can be reduced, making it possible to relatively increase the low pressure. As a result, it is possible to increase capacity and efficiency.

Next, the heating operation will be explained. In Figure 1,
The direction of refrigerant flow during heating is indicated by thick dashed arrows. The high-temperature, high-pressure gas refrigerant discharged from the compressor 1 passes through the air conditioning/heating switching valve 2 and the seventh check valve 73, and then passes through the indoor second check valve 73.
In the heat exchanger 6, the air exchanges heat with the relatively warm indoor air that has passed through the first indoor heat exchanger 7, and is partially condensed, thereby further warming the conditioned air.
Then, it passes through the fourth solenoid valve 61, which is open at this time, and enters the indoor first heat exchanger 7. Here, it exchanges heat with the relatively low-temperature conditioned air, warms the conditioned air, and at the same time completely condenses itself, passes through the eighth solenoid valve 60, which is open at this time, and enters the first throttle device. 5. Here, the indoor blower 8 supplies conditioned air to the indoor first and indoor second heat exchangers 7 and 6. The refrigerant is supplied to a heating throttle circuit 51 formed by a second throttle 51a and a first throttle 52a.
The pressure is reduced at the outdoor heat exchanger 3 and the outdoor blower 4
exchange heat with outdoor air supplied by Then, it evaporates and returns to the compressor 1 through the heating/cooling switching valve 2 and the accumulator 10. Therefore, since the flow direction of the air to be conditioned and the flow direction of the refrigerant perform countercurrent heat exchange, indoor air can be heated to a high temperature and at the same time, heat exchange efficiency is high.

Next, the dehumidifying operation will be explained. In FIG. 1, the flow direction of the refrigerant during dehumidification is indicated by a white arrow. The high-temperature, high-pressure gas refrigerant discharged from the compressor 1 passes through the air conditioning/heating switching valve 2, and in the outdoor heat exchanger 3, since the outdoor blower 4 is stopped, there is natural heat dissipation.
The first electromagnetic valve 55 passes through with almost no condensation;
The second indoor heat exchanger 6 passes through the second check valve 54 and the fifth check valve 71 and exchanges heat with the conditioned air that has been cooled and dehumidified in the first indoor heat exchanger 7, and the conditioned air is When heated, it condenses and liquefies itself. and a second solenoid valve 94 constituting the second throttle device 9
The air is depressurized at the eighth throttle 91 and reaches the indoor first heat exchanger 7. Here, at the same time as the conditioned air is cooled and dehumidified, it evaporates itself, and the sixth check valve 72,
It passes through the heating/cooling switching valve 2 and the accumulator 10 and returns to the compressor 1.

Finally, the defrosting operation will be explained. Most of the refrigerant flow direction is the same as the thick solid arrow in FIG. 1 (flow direction during cooling). That is, the high-temperature, high-pressure gas refrigerant discharged from the compressor 1 enters the frosted outdoor heat exchanger 3, melts the frost, and condenses and liquefies itself. Normally, the outdoor blower 4 is stopped in order to prevent heat radiation to the atmosphere and to perform efficient defrosting.
The liquid refrigerant whose pressure has been reduced by the first throttle 52 a is supplied to the second indoor heat exchanger and the first indoor heat exchanger 6 , 7 in a divided manner, evaporates and vaporizes, and enters the accumulator 10 . Further, a part of the refrigerant discharged from the compressor 1 passes through the fifth electromagnetic valve 62 provided in the second bypass circuit 83 and enters the accumulator 10 . The refrigerant is then mixed with the refrigerant returning from the indoor first and second indoor heat exchangers 7 and 6 and returned to the compressor 1. Normally, when the indoor blower 8 is operated, cold air circulates indoors, so the cold air is stopped (stopping the operation of the indoor blower 8), so the evaporation performance is poor and the low pressure decreases, but it is bypassed from the high pressure side. Since it is a refrigerant, the low pressure increases, the capacity of the compressor 1 can be fully demonstrated, and the amount of refrigerant circulation can be increased, so the defrosting time can be shortened.

〔Effect of the invention〕

As described above, according to the present invention, during cooling operation, the liquid refrigerant whose pressure is reduced in the cooling throttle circuit is divided and supplied to the indoor first heat exchanger and the indoor second heat exchanger, so that the refrigerant on the evaporation side Since the pressure loss can be kept small and the low pressure can be maintained relatively high, the capacity of the compressor can be increased and the efficiency can be increased. In addition, during heating operation, in the flow of conditioned air, the first indoor heat exchanger is placed on the windward side and the second indoor heat exchanger is placed on the leeward side, and the high-temperature refrigerant discharged from the compressor is transferred to the indoor second heat exchanger. 2. Since the countercurrent heat exchange relationship is established in which heat is exchanged by being supplied to the first heat exchanger in this order, the temperature of the conditioned air can be raised relatively high, and the heat exchange efficiency can be improved.

At the same time, even if the indoor blower is stopped during defrosting operation, the high-pressure gas refrigerant is bypassed to the low-pressure side, so the low-pressure pressure can be maintained high, increasing the compressor capacity and shortening the defrost time. It can be measured.

[Brief explanation of drawings]

FIG. 1 is a refrigerant circuit diagram of a heating and cooling dehumidifier showing an embodiment of the present invention, FIG. 2 is a diagram showing the operation of the device, and FIG. 3 is a refrigerant circuit diagram of a heating and cooling dehumidifier showing a conventional example. FIG. 4 is a diagram showing the operation of the device. 1 is a compressor, 2 is an air conditioning switching valve, 3 is an outdoor heat exchanger, 52 is a cooling throttle circuit, 51 is a heating throttle circuit, 5a is a first bypass circuit, 5 is a first throttle device, 8 is a Indoor blower, 7 is the indoor first heat exchanger, 6 is the indoor second heat exchanger, 9 is the second expansion device, 81 is the discharge side refrigerant pipe, 10 is the accumulator, 82 is the accumulator inlet refrigerant pipe , 8
3 is a second bypass circuit, 51 is a heating throttle circuit, and 52 is a cooling throttle circuit. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1 Compressor, an accumulator that stores refrigerant sucked into the compressor, an air conditioning/heating switching valve that switches to each refrigerant circuit during cooling, heating, dehumidification, and fogging, an outdoor heat exchanger, air conditioning, and heating a first diaphragm device having a diaphragm circuit and a first bypass circuit connected in parallel to the diaphragm circuit and having a first solenoid valve and a second check valve in series; A first indoor heat exchanger located on the windward side with respect to the flow of conditioned air, and a second indoor heat exchanger and a second throttle device located on the leeward side thereof, each of the above elements forming a closed loop. A fifth solenoid valve is provided to connect the discharge side piping of the compressor and the refrigerant piping at the inlet of the accumulator or the inlet of the accumulator. a second bypass circuit, a fourth solenoid valve provided in a pipe that communicates the other end of the indoor first exchanger with the other end of the indoor second heat exchanger, and the first throttle device and the indoor second heat exchanger. a third solenoid valve installed in a pipe connecting one end of the first heat exchanger; A fifth check valve provided in the piping and allowing the refrigerant to pass in the same direction, branched from the piping between the other end of the indoor first heat exchanger and the fourth electromagnetic valve and connected to the return piping to the heating/cooling switching valve. a sixth check valve that is provided in the piping from the heating/cooling switching valve to one end of the indoor second heat exchanger and that allows the refrigerant to pass in the same direction; The second throttle device is provided in the middle of the piping between the third solenoid valve and one end of the indoor first heat exchanger and the other end of the indoor second heat exchanger.
It consists of a third throttle and a second electromagnetic valve in series, and during heating operation, the refrigerant discharged from the compressor passes from the air conditioning/heating switching valve to the seventh check valve, and is supplied to the indoor second heat source. It passes through the exchanger and the fourth solenoid valve, which is opened, to the first indoor heat exchanger, where it is condensed and liquefied, and then through the third solenoid valve, which is opened, and is depressurized in the heating throttle circuit. A refrigerant circuit is formed in which the refrigerant is passed through the first outdoor heat exchanger, is evaporated, and returns from the heating/cooling switching valve to the compressor via the accumulator, and during cooling operation, the refrigerant discharged from the compressor is evaporated. The liquid refrigerant passes through the outdoor heat exchanger from the air conditioning switching valve to condense and liquefy, and is further passed through the cooling throttle circuit to reduce the pressure.The liquid refrigerant passes through the fifth check valve and the fourth solenoid valve. The flow is divided into the indoor second heat exchanger which is opened, and the indoor first heat exchanger via the open third solenoid valve, and is evaporated, and the other end of the indoor first heat exchanger is evaporated. A refrigerant circuit is formed that passes through the return pipe from between the and the fourth solenoid valve via the sixth check valve, and returns from the heating/cooling switching valve to the compressor via the accumulator, and dehumidifying operation is performed. At times, refrigerant discharged from the compressor passes through the outdoor heat exchanger from the air conditioning switching valve, and passes through the first solenoid valve, which is opened, to the first solenoid valve.
It is condensed and liquefied through the bypass circuit of the fifth check valve and the second indoor heat exchanger, and is depressurized through the opened second solenoid valve and the second throttling device. A refrigerant circuit is formed in which the refrigerant passes through the first heat exchanger, evaporates and vaporizes, passes through the return pipe via the sixth check valve, and returns from the air conditioning switching valve to the compressor via the accumulator. During frost operation, a portion of the refrigerant discharged from the compressor passes through the opened fifth solenoid valve to the second solenoid valve.
The refrigerant returns from the bypass circuit to the compressor via the accumulator, and most of the discharged refrigerant is passed through the outdoor heat exchanger by the air conditioning switching valve to be condensed and liquefied, and then passed through the cooling throttle circuit. The liquid refrigerant becomes a reduced pressure liquid refrigerant, passes through the fifth check valve, and the fourth solenoid valve is opened.
The water is divided into a heat exchanger and the indoor first heat exchanger via the opened third electromagnetic valve to be evaporated, and is passed through the return pipe via the sixth check valve; A refrigerant circuit is formed that returns from the air conditioning switching valve to the compressor via the accumulator, and each of the refrigerant circuits is selectively switched and formed by the air conditioning switching valve and each of the electromagnetic valves. Features: Air conditioning/heating dehumidifier.