JPS59147965A - Air conditioner - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air conditioner having cooling and dehumidifying functions.

Figure 1 shows an overview of a conventionally used air conditioner for both cooling and dehumidification. During the cooling cycle, the refrigerant discharged from the compressor (1) passes through the four-way switching valve (hereinafter referred to as four-way valve) (2) that switches the refrigerant circuit, enters the condenser (8), and enters the condenser (8). It exchanges heat with and condenses into liquid. This liquid refrigerant
It passes through the check valve (7), is depressurized by the throttle device (6), and enters the cooling coil (4). The low-pressure liquefied refrigerant exchanges heat with indoor air A, evaporates, and returns to the compressor (1). Then, the indoor air A is cooled, dehumidified, and blown into the room. At that time, the blown air passes through the reheating coil 71' (3) '(r, but no heat is received. This is because a No. I check valve (5) is installed at one end of the reheating coil (3). This is because the inflow of refrigerant is blocked, so it does not function as a heat exchanger.At this time, the other end of the reheat coil/L/(3) is connected to the compressor (1) via the four-way valve (2). ) communicates with the inlet.

On the other hand, during the dehumidification cycle, the four-way valve (2) is switched,
The circuit indicated by the broken line in the figure is formed. Therefore, the refrigerant discharged from the compressor m (1) passes through the four-way valve (2) and reheats the coil yv
Flows into (3). Here, the indoor air B is condensed and liquefied by exchanging heat with the indoor air B that has been cooled and dehumidified by the cooling coil tv (4).Then, the indoor air B is heated, its relative humidity is reduced, and it is blown into the room as indoor air O. The liquid refrigerant flows through the first check valve (f
i) The air is depressurized by the expansion device (6), exchanges heat with indoor air A by the cooling coil (4), evaporates, and returns to the compressor (1). At this time, the condenser (8) communicates with the suction port of the compressor (1) via the four-way valve (2).

In the above circuit, during the cooling cycle, the reheat coil 7 (3), which is an indoor heat exchanger, is not utilized because it is refrigerated. In addition, when switching from the cooling cycle to the dehumidification cycle, the condenser that had previously performed the condensation and liquefaction function (
8) and the suction port of the compressor (1) are communicated, and when switching from the dehumidification cycle to the cooling cycle, the reheating coil RV (3) and compressor m (1), which had been condensing and liquefying, are connected.
Since the suction ports of the refrigerant refrigerant are communicated with each other, the high-pressure liquid refrigerant in the condenser (8) or the reheat coil μ(3) is rapidly moved by the pressure difference and flows into the compressor (1). That is, in either case, when the operating cycle Ivf is changed, a sudden liquid buildup may occur, which may damage the compressor (1).

This invention was proposed to improve all of the above drawbacks.
During the cooling cycle, the coil is used as a reheating coil TVF cooler to improve performance, and when switching to the dehumidification cycle, the condenser and cooling coil inlet are communicated, so that all of the liquid refrigerant in the condenser is removed. To provide an air conditioner which prevents liquid build-up by guiding the refrigerant to a cooling coil, evaporating it there, and then sucking it into a compressor, and which performs good operation with an appropriate amount of refrigerant in both cooling and dehumidification. It is something.

Embodiments of the present invention will be described below with reference to FIG. 2 (during cooling operation) and FIG. 3 (during dehumidifying operation). In (2), the same reference numerals as in FIG. 1 indicate the same or corresponding parts, and (11) is a first pipe line that communicates the condenser (8) with the inlet of the reheating coil/l/ (3); A first throttle device i f201 and a check valve Ql) are provided in the middle. (121 is a second pipe line that bypasses the condenser (8) and the first pipe line (11), and communicates with the four-way valve (2) and the reheat coil 3). 0 is the third conduit that bypasses the second throttle Hfft e22 provided between the reheating coil (3) and the cooling coil (L/4), and a solenoid valve is installed in the middle. It is being

The solenoid valve (the sieve opens during the cooling cycle μ and closes during the dehumidification cycle. θ4) connects the four-way valve (2) and the cooling coil (
4), when the four-way valve (2) is in the cooling psyche /l/' (H formation), the four-way valve (
2), it is connected to the second pipe line (121), and when the dehumidification cycle/I/full is being formed, it is connected to the condenser (121) via the four-way valve (2).
In addition, a third diaphragm device is provided in the middle of the fourth ii' @ Q41 which communicates with 8).弼 is a container that is installed in the air path between the cooling carp /L/ (4) and the reheating carp /L/ (3) and exchanges heat with indoor air B. The fifth pipe 0υ communicates with the inlet of the reheating coil 3).

Next, the action will be explained.

During cooling operation (FIG. 21), the four-way valve (2) is switched to complete the cooling cycle iv as shown. Therefore, the refrigerant discharged from the compressor (1) enters the condenser (8) through the four-way valve (2), exchanges heat with the cooling water, and is condensed and liquefied.

The liquefied refrigerant passes through the first pipe line (11) and is connected to the first throttle device (
5) The pressure is reduced. Since the solenoid valve is open, this low-pressure liquefied refrigerant flows into the reheating coil 1v (3), which has the same pressure as the cooling coil (4), and the room is cooled and dehumidified by the cooling coil (4). It exchanges heat with air B and some of it evaporates. Indoor air B is further cooled and dehumidified to become indoor air C.
It is blown out into the room. The refrigerant that has partially evaporated in the reheating coil tV (a) passes through the solenoid valve (transmission) and enters the cooling coil (4), where it exchanges heat with indoor air A and evaporates, leading to the compressor (1). Return to Indoor air A is then cooled and dehumidified to become indoor air B described above.

In this cooling system, the second
The pipe line (121 and the fourth pipe Q4) is in communication, but
Since the fourth conduit I is provided with the third throttling device ff1f (24), most of the refrigerant depressurized by the first throttling device -) is reheated by the reheat coil/l/(3 ).

A small portion of the refrigerant flows into the cooling coil V (4) through the second pipe line 02)% four-way valve (2) and the fourth pipe line α41, but in the cooling coil (4) it flows into the indoor air. Since it contributes to heat exchange with A, there is no loss. Further, the container □□□ exchanges heat with the indoor air B, but the temperature of the indoor air B is higher than the evaporation temperature. In other words, the saturation temperature of the internal pressure of the container is higher than the temperature of the indoor air B. Therefore, low-pressure deactivated gas is stored inside the container (a). On the other hand, during dehumidification operation (FIG. 3), the four-way valve (2) is switched to form a dehumidification cycle as shown. The refrigerant discharged from the compressor (1) passes through the four-way valve (2), bypasses the condenser (8) and the first pipe (11), and then flows from the second pipe (121) to the reheating coil v.
Flows into (3). Here, the refrigerant exchanges heat with the blank air B which has been cooled and dehumidified by the cooling coil v (4), and is condensed and liquefied. Then, the indoor air B is heated, its relative humidity is reduced, and is blown into the room as indoor air C. Also reheat carp tv (3
) The high-pressure liquefied refrigerant is depressurized here through the second throttling device because the °d solenoid valve (231) is closed. This low-pressure liquefied refrigerant enters the cooling coil/l/(4) and enters the chamber. It exchanges heat with air A, evaporates, and returns to the compressor (1), and indoor air A is cooled, dehumidified, and becomes indoor air B. In this dehumidifying psych/l/, the first pipe line (11) and The condenser (8) and the fourth conduit θ4) communicate with each other via the four-way valve (2).
The high pressure refrigerant does not flow to the condenser (8) due to the check valve 1 provided in the conduit (11). However, immediately after switching from cooling Psycheμ to dehumidifying Psycheμ, high-pressure liquid refrigerant exists in the condenser (8), and this flows from the four-way valve (2) to the fourth pipe line (14). The high-pressure liquid refrigerant moves to the low-pressure side, but the pressure is reduced by the third throttle device (241), and it becomes a low-pressure liquid refrigerant, enters the cooling coil IV (4), and evaporates.

Therefore, sudden liquid/<tsuku> does not occur immediately after cycle switching. The high-pressure liquid refrigerant in the condenser (8) can then be used to cool the indoor air A.

Note that during the dehumidification cycle, the container 181 is at the pressure side and is cooled by the indoor air B.

Therefore, high-pressure liquid refrigerant accumulates in 48 cm. Since the condenser (6) is connected to the low pressure side during dehumidification psyche μ, only low pressure superheated gas exists inside the condenser (6).

On the other hand, when cooling the air conditioner 7, the inside of the condenser (8) (
(There is a condensate refrigerant, and there is also a gas-liquid mixed refrigerant at I degree pressure in the reheat coil yv (3). Therefore, a larger amount of refrigerant is required during the cooling cycle μ. If refrigerant is sealed accordingly, the amount of refrigerant will be excessive during dehumidification, but this excess refrigerant will be absorbed by the container.In other words, during the cooling cycle, which requires a large amount of refrigerant, During the dehumidification cycle, when low-pressure superheated gas frequently occurs inside and there is an excess of refrigerant, the container's refrigerant amount adjustment function allows the liquid refrigerant at the internal VC and pressure to accumulate, ensuring good performance in both cooling and dehumidification operations. can get.

As described above, according to the present invention, during the cooling cycle, the reheating coil 7 acts as a cooler in addition to the cooling coil 4), so that performance is improved.

In addition, when switching between cooling and dehumidification cycles, the liquid refrigerant in the non-active pipes is evaporated by the cooling coil, so the cycle time is reduced.
8. To the compressor immediately after switching. No characteristic liquid spots are formed,
There is no risk of damage to the compressor, and the high-pressure liquid refrigerant can be effectively used to cool all room air.

Furthermore, in conventional air conditioning and dehumidification air conditioners, there is a risk that refrigerant may leak from either check valve in any cycle, and the leaked refrigerant is directly transferred to the compressor (1). Since the refrigerant is sucked in, the performance is reduced accordingly, but in the present invention, the above-mentioned performance reduction due to refrigerant leakage does not occur during the cooling cycle. Furthermore, since the refrigerant lid circulating within the psychrometer 7 is regulated by the container communicating with the inlet or outlet of the reheating coil, both the cooling cycle and the dehumidifying psychrometer 1 can be operated in good condition. can.

[Brief explanation of drawings]

Figure 1 (shows the psyche of a conventional air conditioner with both cooling and dehumidifying functions)
Figure 1, Figure 2 and Figure 3 each illustrate a cooling operation and a dehumidification operation according to an embodiment of the present invention. In the figure, (1) is the compressor 2 (2) is the four-way switching valve, (3) is the reheating coil, (4) is the cooling coil, (8) is the condenser,
(11) is the first pipe line, 021 is the second pipe line, (13)
is the third pipe line, (14) is the fourth pipe line, (1) is the fifth pipe line, (a) '1 is the first check valve, i
2z is a second throttle device, and 1231 (r!, 'rK, magnetic valve, 26) is a container. Note that the same reference numerals indicate the same or equivalent parts. Figure 1 Figure 2

Claims (1)

[Claims] The refrigerant discharged from the compressor is connected to a four-way switching valve, a condenser, a first conduit in which a first throttling device and a first check valve are installed in series, a reheating coil M, and a solenoid valve installed in the middle. a cooling cycle in which refrigerant is drawn into the compressor via a third pipe line and a cooling coil IVf; and a second pipe in which refrigerant discharged from the compressor is routed through the four-way switching valve, the condenser and the first pipe line A dehumidification cycle in which the air is sucked into the compressor through the conduit, the reheating coil, the second throttling device which is routed entirely through the third conduit, and the cooling coil /L/wo, and the upper two four-way switching valves during the cooling cycle. (a fourth pipe that communicates the condenser and the cooling coil inlet via the four-way switching valve during the dehumidification cycle). a container placed in the air path between the cooling coil and the reheating coil, and a fifth pipe communicating the container with the inlet or outlet of the reheating coil L. An air conditioner characterized by: