JPH03177755A - Refrigerating cycle - Google Patents

Abstract

PURPOSE:To perform dry operation with a small sized inexpensive room air conditioner by dividing an indoor heat exchanger, and providing a dehumidifying diaphragm and a check valve in parallel between the two divided in-door heat-exchangers. CONSTITUTION:An indoor heat-exchanger 21 is divided into an up-stream side machine 21a and a lower stream side machine 21b respectively, and a dehumidifying diaphragm 22 and check valve 23 are provided between the two divided indoor heat-exchangers in parallel. In the dehumidifying operation, the coolant being discharged from a com pressor 14 enters into an outdoor heat-exchanger through a discharge pipe 15, and a four-way valve 17. At this time, when the blast amount to be supplied to the heat- exchanger 18 is lowered, the heat exchanged amount is limited, the coolant in saturated state rich in gas component is sent to the indoor heat-exchanger 21b through the check valve 20, dissipate heat to the surrounding atmosphere, overheating it, while the coolant itself is subjected to condensation, reduced in pressure by the dehumidifica tion diaphragm 22 and flows into the indoor heat-exchanger 21a. Here, the coolant robs heat of the atmosphere and evaporator, atmospheric air is cooled and dehumidi fied. The evaporated coolant is returned to the compressor 14 passing through the four-way valve 17 and an intake pipe 16.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a room air conditioner, and particularly to a refrigeration cycle suitable for lowering humidity without significantly lowering the temperature.

[Conventional technology]

BACKGROUND ART A room air conditioner called a "dry type" is generally known as a room air conditioner that lowers humidity without significantly lowering the temperature.

An example of this type of room air conditioner, Jikko 55-4
The refrigeration cycle of Publication No. 9483 is shown in FIG.

The prior art will be briefly described with reference to FIG.

1 is a compression machine, 2 is a discharge pipe, 3 is a suction pipe, 4 is a four-way valve, 5 is an outdoor heat exchanger, 6 is a heating throttle, 7 is a check valve, 8a and 3b are cooling throttles, 9 is a Dehumidification aperture, 10a
, 10b is an indoor heat exchanger, 11 is a three-way valve, and 12 and 13 are outdoor units made up of these parts.

It is an indoor unit.

Next, the flow of refrigerant in each operation mode will be described. First, during cooling operation, the three-way valve 11 is connected as shown by the broken line in FIG. Then, the refrigerant flows from the compressor 1 to the discharge pipe 2. Four-way valve 4. Outdoor heat exchanger5. After passing through the check valve 7, a portion passes through the throttle 8a, the indoor heat exchanger 10a, and the three-way valve 11, and the remaining part passes through the throttle Bb, the indoor heat exchanger 10b, and then from the four-way valve 4 through the suction pipe 3. Return to compressor 1.

During heating, the refrigerant flows in the opposite direction by switching the four-way valve 4, passing through the throttle 6 instead of the check valve 7 and returning to the compressor l.

During dry operation, the four-way valve 4 is set in the same manner as during cooling, and the three-way valve 11 is set as shown by the solid line. By stopping or slowing down the air blowing to the outdoor heat exchanger 5, the refrigerant that has not been completely condensed is transferred from the three-way valve 11 to the outdoor heat exchanger 10a, through the throttle 9, and then to the outdoor heat exchanger 10b.
, four-way valve 4. Return from suction pipe 3 to compressor l.

[Problem to be solved by the invention]

In the above conventional technology, due to the configuration of the refrigeration cycle, the three-way valve 1
1 and throttles F3a, 3b, etc. are required, which complicates the refrigeration cycle, which is undesirable in terms of miniaturization of the indoor unit 13.

Furthermore, since it is necessary to reduce the flow resistance of the refrigerant through the three-way valve 11 in terms of performance, there is a drawback in terms of cost.

An object of the present invention is to provide a room air conditioner that is compact and capable of dry operation at low cost by having a simpler refrigeration cycle configuration.

[Means to solve the problem]

In order to achieve the above object, the present invention divides an outdoor heat exchanger into at least two parts, and connects a dehumidifying throttle and a check valve in parallel between the parts. Then, one end of such an indoor heat exchanger is connected to a four-way valve, the other end is connected to an outdoor heat exchanger via a heating throttle, and a check valve is connected in parallel with this heating throttle, and the outdoor heat exchanger is connected to the outdoor heat exchanger. Connect the other end of the vessel to a four-way valve, and connect the four-way valve to the compressor.

[Effect]

The operation pattern is divided into dehumidification operation and heating operation. First, we will discuss dehumidification operation and then heating operation.

During dehumidification operation, the refrigerant discharged from the compressor is passed through a four-way valve,
After passing through the outdoor heat exchanger, the air flows into the indoor heat exchanger on the downstream side through a forward check valve while maintaining high pressure. At this time, by reducing the amount of air blown from the outdoor heat exchanger, the amount of heat released from the outdoor heat exchanger is reduced, and the refrigerant enters the indoor heat exchanger as it is in the superheated or saturated range, where it radiates heat. ,
The air is depressurized by the dehumidifying throttle, flows into the indoor heat exchanger on the upstream side, takes heat from the surrounding air, and the refrigerant evaporates.At this time, the surrounding air is cooled and dehumidified, and the downstream heat exchange of the air is completed. As the air passes through the container, it is reheated, and the temperature does not drop that much, and the air is blown out from the indoor unit as air with a lower humidity. The air then returns to the upstream compressor.

During heating operation, the refrigerant discharged from the compressor enters the indoor heat exchanger through the four-way valve, where it radiates heat to the surrounding air, and then passes through the forward check valve and enters the indoor heat exchanger under the air. After radiating heat to the air again, the air is depressurized through a heating throttle, flows into an outdoor heat exchanger, absorbs heat from the outdoor air, evaporates, and returns to the compressor via a four-way valve.

By the above-described operations, it is possible to perform a dehumidifying operation and a heating operation that lower the humidity without changing the temperature much.

Note that during dehumidification operation, by adjusting the air flow rate of the outdoor heat exchanger, the temperature of the air blown out from the indoor heat exchanger can be adjusted to be higher or lower.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

First, the first embodiment will be described with reference to FIG.
is a four-way valve, 18 is an outdoor heat exchanger, 19 is a heating diaphragm, 2
0 is a check valve provided in parallel with the heating throttle 19, 21a1 and 21b are indoor heat exchangers on the upstream and downstream sides of air, and 22 is provided between indoor heat exchangers 21a and 21b. A dehumidifying throttle and a check valve are provided in parallel to the dehumidifying throttle 22, 24 is an outdoor unit, and 25 is an indoor unit.

Next, the operation of the refrigeration cycle will be described. First, during dehumidification operation, the refrigerant discharged from the compressor 14 is transferred to the discharge pipe 15. It enters the outdoor heat exchanger 18 via the four-way valve 17. Then, by reducing the amount of air blown to the heat exchanger 18 (including stopping the blower (not shown)), the amount of heat exchange is limited, and the amount remains in the overheating region or in the saturated state with a large amount of gas components. The refrigerant passes through the check valve 20 and enters the indoor heat exchanger 21.
sent to b. In the same heat exchanger 21b, the refrigerant radiates heat to the surrounding air, heating the air, and the refrigerant itself condenses, is depressurized by the dehumidifying throttle 22, and flows into the indoor heat exchanger 21a. The refrigerant then removes heat from the air and evaporates, cooling and dehumidifying the air. The evaporated refrigerant is removed from the four-way valve 17. It returns to the compressor 14 via the suction pipe 16. By operating in this manner, the indoor air is cooled and dehumidified in the upstream air heat exchanger 21a, and then reheated in the downstream heat exchanger 21b, resulting in little temperature change and only a decrease in humidity. It becomes air,
It is returned to the indoor space again.

In this case, if the amount of air blown to the outdoor heat exchanger 18 is reduced, the amount of heat released from the outdoor heat exchanger 18 is reduced, and the temperature of the air blown out from the indoor unit 25 can be increased. Conversely, if the amount of air blown to the outdoor heat exchanger 18 is increased, the temperature of the air blown out from the indoor unit 25 can be lowered.

Next, the heating operation will be described. The refrigerant discharged from the compressor 14 passes through the four-way valve 17 and is then transferred to the indoor heat exchanger 21.
a, through the check valve, the refrigerant flows to the indoor heat exchanger 21b, and the heat is released into the indoor air by both heat exchangers 213 and 21b, and the refrigerant itself is condensed, and the pressure is reduced by the heating throttle 19, and the outdoor heat is released. It is evaporated in the exchanger 18 and returned to the compressor 14 via the four-way valve 17. If the amount of frost on the outdoor heat exchanger 18 increases during heating operation, defrosting is performed using the heating aperture 19 and the outdoor heat.

By configuring the refrigeration cycle as described above, a compact, low-cost refrigeration cycle without the expensive three-way valve 11 or the throttles 8a, Bb, etc. as in the conventional example shown in FIG. To provide a room air conditioner capable of dehumidifying operation that lowers only humidity without lowering temperature too much and heating operation suitable for people.

Next, FIG. 2 shows a second implementation of the present invention? Let's talk about lJ. This embodiment is similar to the apertures 19 and 2 of the first embodiment.
2, temperature type expansion valves 26 and 27 are used. This allows efficient and reliable operation over a wider range of temperature conditions.

Next, a third embodiment of the present invention will be described with reference to FIG. This embodiment is a refrigeration cycle that can obtain a higher indoor air blowout temperature during dehumidification operation than the first embodiment. Regarding the configuration of the refrigeration cycle of this embodiment, only the parts that are different from FIG. 1 will be described. 28 is a check valve provided between the outdoor heat exchangers 18 a and 18 b;
29 is a two-way valve provided between the outdoor heat exchanger 18b and the heating throttle 19, and 3o is the outdoor heat exchanger 18a and the check valve 2.
A check valve 31 is provided in a circuit connecting between the outdoor heat exchanger 18 b and the two-way valve 29 and a suction pipe on the low pressure side. A resistor such as a capillary tube is shown in the circuit connecting 16.

Next, the operation of dehumidification operation will be described. Close the two-way *29 and two-way defrost valve 25. Then compressor 14
The refrigerant discharged from the refrigerant passes through the outdoor heat exchanger 18a through four directions *17, and then flows to the indoor heat exchanger 21b through the check valves 3Q and PI. The outdoor heat exchanger 18b has a check valve 28. It is closed by the two-way valves 25 and 29 and communicated with the suction pipe 16 via the resistor 3, resulting in low pressure, so there is no flow of refrigerant and no heat exchange with outdoor air. By doing so, the heat radiation from the outdoor heat exchanger 18 during dehumidification operation can be reduced by limiting it to only a part of the outdoor heat exchanger 18a, and the refrigerant in a high enthalpy state can be transferred to the indoor heat exchanger. Vessel 21
Since indoor air can be sufficiently reheated, it becomes possible to blow out air with higher temperature and lower humidity.

Also, during heating operation, by opening the three-way valve 29,
The refrigerant from the indoor heat exchanger 21b is depressurized by the throttle 29, flows through the three-way valve 29 to the outdoor heat exchanger 18b, passes through the check valve side to the outdoor heat exchanger 18a, and then flows to the outdoor heat exchanger 18a.
．． 28b can be used effectively.

The above embodiments were all refrigeration cycles that could perform either dehumidifying operation or heating operation. The following embodiment is shown to accommodate users who do not need heating but only need dehumidifying operation. In FIG. 4, 32 is a compressor;
1 is an outdoor heat exchanger, 34b is an indoor heat exchanger on the upstream and downstream sides of air, and 35 is an aperture.

During dehumidification operation, the high-temperature, high-pressure refrigerant discharged from the compressor radiates part of its heat in the outdoor heat exchanger, then flows into the indoor heat exchanger 34b, reheats the surrounding air, and heats the refrigerant itself. is cooled, condensed, reduced in pressure by the throttle 35, evaporated in the indoor heat exchanger 34a, and returned to the compressor 32. In this way, the indoor heat exchanger 34a cools and dehumidifies the surrounding air,
Air that is reheated by the indoor heat exchanger 34b and whose temperature is not lowered much but whose humidity is lowered can be blown into the room.

According to this embodiment, no three-way valve or two-way valve is used;
A simple refrigeration cycle enables dehumidifying operation suitable for the elderly and the like.

Note that the pressure of the outdoor heat exchanger is set to m as shown in Figure 5.
By providing it around the rod 32 and making it a natural convection type, a blower for the outdoor heat exchanger is no longer necessary, and a low-cost room air conditioner can be provided.

〔Effect of the invention〕

According to the present invention, a refrigeration cycle that does not use a three-way valve, multiple throttles, etc. can be configured for users who only need dehumidifying operation and cooling operation, so that a smaller and lower cost room air conditioner can be provided. I can do it.

[Brief explanation of drawings]

1 to 5 are system diagrams of refrigeration cycles according to embodiments of the present invention. 14... Compressor 18... Outdoor heat exchanger 20... Check valve 213, 21 b, 22, Throttle 26, 27... Expansion valve 29... Two-way valve 31... Resistor a...・・Outdoor heat exchanger 34a, 34b・・Indoor heat exchanger 35・・throttle Figure 6 shows: 17 ・・Four-way valve 19 ・・・throttle indoor heat exchanger ・・・check valve a・...Check valve 30...Check valve 32...Compressor Conventional refrigeration rhinoceros? :8-4 Stop Za--No. 12 square 50-Seidoku Tanjri 3Z---/i, m machine 5.5~-Ichiri F heat 2 size flash i 34 wide, 54b-11 Internal heat 5:j essential equipment 55-Ichima 2
Figure 5 Figure 6

Claims (1)

[Claims] 1. In a refrigeration cycle including a compressor, a four-way valve, an outdoor heat exchanger, an indoor heat exchanger, and a throttle, the indoor heat exchanger is divided into two parts, and the throttle and check valve are connected in parallel between them. A refrigeration cycle characterized by being connected to. 2. The refrigeration cycle according to claim 1, wherein a check valve is provided between the outdoor heat exchanger and the indoor heat exchanger in parallel with the throttle and the throttle. 3. In the refrigeration cycle according to claim 1, the outdoor heat exchanger is divided into two, and the four-way valve, the outdoor heat exchanger,
A check valve, the outdoor heat exchanger two-way valve, the aperture, and the indoor heat exchanger are connected in sequence, and heat exchange is performed between the heat exchanger near the four-way valve and the check valve, and between the aperture and the indoor heat exchanger. A refrigeration cycle connected to the container via a check valve. 4. In claim 1, the indoor heat exchanger is divided into two,
A refrigeration cycle in which the compressor, the outdoor heat exchanger, the indoor heat exchanger, the throttle, and the indoor heat exchanger are sequentially connected. 5. The refrigeration cycle according to claim 4, wherein the outdoor heat exchanger is a natural convection heat exchanger.