JPS59147966A - 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 a complete overview of a conventionally used air conditioning/dehumidifying air conditioner by Honkawa. During the cooling cycle, the refrigerant discharged from the compressor (1) passes through a four-way switching valve (hereinafter referred to as the four-way valve) that switches the refrigerant circuit (2) e, enters the condenser (8), and coolant water enters the condenser (8). The liquid refrigerant passes through the second check valve (7), is depressurized by the throttling device (6), and enters the cooling coil (4).The low-pressure liquefied refrigerant flows through the indoor air It exchanges heat with A, evaporates, and returns to the compressor (1).Then, the indoor air A is cooled, dehumidified, and blown into the room. It spreads, but no heat is received.It is a reheat carp /L/ (3
This is because the first check valve (5) is provided at one end of ), and the inflow of refrigerant is stopped at one end, so that it does not function as a heat exchanger. At this time, the other end of the unladled carp IV (3) is in communication with the suction port of the compressor (1) via the four-way valve (2).

On the other hand, during the dehumidification cycle, the four-way valve (2) is switched to 1.
The circuit indicated by the broken line in the figure is formed. Therefore, the refrigerant discharged from the compressor (1) is heated by the four-way valve (2).
l/ flows into (a). Here, the cooling coil l′V(4
), the indoor air B exchanges heat with the humidified indoor air B, condenses and liquefies it, and the indoor air B is heated, its relative humidity decreases, and is blown out into space as indoor air C. The liquid refrigerant passes through the first check valve (5), is depressurized by the throttling device (6), exchanges heat with the indoor air KA in the cooling coil (4), evaporates, and returns to the compressor (1).
Return to At this time, the condenser (8) communicates with the suction port of the compressor (1) via the four-way valve (2)k.

In the above circuit, during the cooling cycle, the reheating coil 1lJ (3), which is the sacred treasure of indoor heat exchange, is not utilized in the refrigeration cycle. In addition, when switching from the cooling cycle to the dehumidification cycle, the condensation 4 that had been condensing and liquefying
(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 7, which had been performing condensation and liquefaction, and the suction port of the compressor (1) Because the ports are communicated, the high-pressure liquid refrigerant that was in the horizontal unit (8) or reheating coil (3) moves rapidly due to the pressure difference and flows into the compressor (1). /L', in either case, a sudden liquid back up may occur and damage the compressor (1).

This invention was proposed to improve the above drawbacks.
During the cooling cycle, the reheating coil /l/(3)' is used as a cooler to improve performance, and when switching to the dehumidification cycle, the condenser and the cooling coil inlet are communicated. The liquid refrigerant in the condenser is ground into a cooling coil, where it is evaporated and then sucked into the compressor, which prevents the liquid from building up and is suitable for both cooling and dehumidification with an appropriate amount of refrigerant. It provides a circulator for the air that performs proper operation.

An embodiment of the present invention will be described below with reference to FIG. 2 (during cooling operation) and FIG. 3 (during dehumidifying operation).

In the figure, the same reference numerals as in Figure 1 indicate the same or corresponding parts.I7
, (11) is a first pipe line that communicates the inlet of the condenser (8) and the reheating coil/l/ (3), with a first throttling device installed on the way.
) and a check valve holder 11 are provided. Oz is the condenser (
8) and the first pipe line (11), and is a second pipe line that connects the four-way valve (2) and the reheating coil A/ (3). (
13) is the third conduit that bypasses the second throttle 11z provided between the reheating coil /l/' (3) and the cooling coil (4), and the solenoid valve is opened &' cut in the middle. ing. This ridge valve track opens during the cooling cycle and closes during the dehumidification cycle. (14) is a fourth conduit that communicates the four-way valve (2) with the inlet of the cooling coil 71/(4), and when the four-way valve (2) forms a cooling cycle/l/i, the four-way valve (2), it communicates with the second conduit Q2), and when forming a dehumidification cycle, it communicates with the condenser (8) via the four-way valve (2). still,
A third throttling device (241) is provided in the middle of the fourth pipe line θ4.
This is a container provided between the pipe line and the second throttle device @. Next, the action will be explained.

During cooling operation (Fig. 2), the four-way valve (2) is switched to 1.
Form a cooling cycle as shown. The refrigerant discharged from the compressor (1) passes through the four-way valve (2) and enters the condenser (8), where it exchanges heat with the cooling water and is liquefied. The liquefied refrigerant passes through the first pipe (Ill) and is depressurized by the first throttle device. Since the solenoid valve (23) is open, this low-pressure liquefied refrigerant reaches the same pressure as the cooling coil (4). The reheating carp /L/ (3) flows into the cooling carp /L/ (4
), the SO indoor air B, of which a portion evaporates, is further cooled and dehumidified and blown into the room as indoor air C. -11f heating coil (3
), the refrigerant that has partially evaporated enters the container (passing through the solenoid valve (231) and the cooling coil 4), where it exchanges heat with indoor air A and is evaporated into the compressor (1). return.

Then, the indoor air A is cooled and dehumidified to become the above-mentioned indoor air B. In this cooling cycle, the second conduit θ2) and the fourth conduit are in communication via the four-way valve (2),
Most of the refrigerant depressurized in the fourth conduit (!) is provided with the third expansion device (2 (transition), so inside the first throttling device), as described above, the reheating coil (! ).A small portion of the refrigerant flows into the second pipe (12), the four-way valve (2) and the fourth pipe.
Although it flows into the cooling coil (4) through the pipe line (14), it does not result in a loss because it contributes to heat exchange with the indoor air A at the cooling coil (4).

On the other hand, during dehumidification operation (Fig. 3), (1-way valve (2)
The area is changed to form a dehumidifying chamber (1) as shown in the figure.

The refrigerant discharged from the compressor (1) passes through the four-way valve (2), the condenser (8) and the first. pipe (Ill is bypassed and the second
The reheated carp /L/ flows into (3) from the pipe α2. Here, the refrigerant exchanges heat with the indoor air B which has been cooled and dehumidified by the cooling coil/l/ (4) and is condensed and liquefied. And indoor air B
is heated, its relative humidity decreases, and it is blown into the room as indoor air %C. Further, the high-pressure liquefied refrigerant of the reheating carp/1/ (3) flows into the container ridge, and since the solenoid valve (23) is closed, it passes through the second throttle device t2'l-, where it is depressurized.

This low-pressure liquefied refrigerant enters the cooling coil (4), exchanges heat with the indoor air A, evaporates, returns to the compressor (1), and returns to the indoor air A.
is cooled and dehumidified and becomes indoor air B. In this dehumidification cycle, the first pipe line (11) and the condenser (8) are communicated with the fourth pipe line (14) via the four-way valve (2),
The high pressure refrigerant does not flow to the condenser (8) due to the first pipe line (due to the check valve provided in l11). However, 2 cooling cycle μ
Immediately after switching from to dehumidifying Psycheμ, there is a high-pressure liquid cooler in the condenser (8), which moves from the four-way valve (2) to the low-pressure side through the fourth pipe (I4). , this high-pressure liquid refrigerant is depressurized in the third throttling device, becomes a low-pressure liquid refrigerant, enters the cooling coil A/(4), and evaporates. Therefore,
The high-pressure liquid refrigerant in the condenser (8) can be used to cool the indoor air A without causing a sudden liquid back up immediately after the cycle is changed.

By the way, during the cooling cycle, condensed liquid refrigerant exists in the condenser (8), and low-pressure gas-liquid mixed refrigerant also exists in the reheating coil 7 (3), whereas during the dehumidifying cycle 7, There is condensate refrigerant in the reheat coil/work 3),
There is no low pressure superheated gas in the condenser (8). Therefore, the necessary amount of fs differs depending on the cycle, and cooling cycle requires a larger amount of refrigerant, but this holy war harmonizer is equipped with a container (251), and during the cooling cycle, there is a container (251) inside. (contains a low-pressure gas-liquid mixed refrigerant, and stores a high-pressure liquid refrigerant during the dehumidification cycle.

In other words, it's better during the dehumidification cycle than during the cooling cycle! lll
Much refrigerant is accommodated in the container t%. That is, since the surplus refrigerant during the dehumidification cycle is absorbed by the tea set, the surplus refrigerant does not accumulate in the reheating carp/L/(3) and reduce the heat exchange capacity. This also means that during a cooling cycle that requires a large amount of refrigerant, refrigerant is replenished from the container side θ.

As described above, according to the present invention, the reheating coil 1 acts as a cooler in addition to the cooling coil 4) during the cooling cycle, so that performance is improved.

In addition, when switching between cooling and dehumidification cycles, the liquid refrigerant in the non-operating pipes is evaporated by the cooling coil, so there is no sudden liquid backflow to the compressor immediately after the cycle is switched, and the pressure increases.
There is no risk of damaging the machine a, and high pressure liquid refrigerant 'f
cCan be effectively used to cool indoor air.

Historically, in conventional air conditioners that combine cooling and dehumidification, there is a risk of refrigerant leaking from one of the check valves in any cycle, and the leaked refrigerant is directly transferred to the compressor (1). ), 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 amount of refrigerant circulating in the cycle is regulated by the container, both the cooling and dehumidifying psychrometers μ can be operated in good conditions.

[Brief explanation of the drawing]

FIG. 1 is a cycle explanatory diagram of a conventional cooling/dehumidifying air conditioner, and FIGS. 2 and 3 are explanatory diagrams of a cooling operation and a dehumidifying operation, respectively, showing an embodiment of the present invention. In the figure, (1) is a compressor, (2) is a four-way switching valve, (3) is a reheating coil, (4) is a cooling coil, (8) is a condenser,
(11) is the first conduit, (12+ is the second conduit, (13)
) is the third pipe line, circle is the fourth pipe line, (a)) is the first throttle device, sil) is the check valve, and 2 is the second throttle device, 123
1 is a solenoid valve, (? θ is a container. The same reference numerals indicate the same or corresponding parts. Agent Makoto Kuzuno - Figure 1 Figure 2

Claims (1)

[Claims] The refrigerant discharged from the compressor is transferred through 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, and a first conduit in which a solenoid valve is installed in the middle. a cooling cycle in which the refrigerant is sucked into the compressor via the pipe No. 3 and the cooling coil Iv, and a pipe @2 which bypasses the refrigerant discharged from the compressor through the four-way switching valve, the condenser and the first pipe. duct, the reheat coil, and the third conduit. The dehumidifying syringe/hydrogen is sucked into the compressor through the second throttling device and the cooling coil, and during the cooling cycle V, the air is connected to the third VN and the cooling coil inlet via the four-way switching valve. a fourth conduit connecting the condenser and the cooling coil inlet through the four-way switching valve during the dehumidification cycle, and a fourth conduit connecting the reheating coil outlet and the third conduit. %fi of the container provided between the channel and the second throttle device.