JPS60133274A - Multi-chamber type 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] (Technical Field) The present invention provides a multi-room air conditioning system, specifically, a single outdoor unit equipped with a compressor, a four-way switching valve, and a heat source side heat exchanger.
A multi-room air conditioning system that connects several indoor units equipped with heat exchangers on the user side was inspired.

(Prior art) The above-mentioned (constituting air-conditioning equipment)
The device described in Japanese Patent No. 49856 and shown in FIG. 2 is known.

What is shown in FIG. 2 will be briefly explained.

(A) is an outdoor unit, and (B), (C), and (D) are indoor units connected in parallel to the outdoor unit (A), respectively.

In the outdoor unit (A), (50) is a compressor;
(51) is a four-way switching valve, C52) is a heat source side heat exchanger, (
55) is a corrugated main pipe connected to the indoor unit (B), (C), and (D) side entrances and exits of the heat source side heat exchanger (52), and (53a) is connected to the corrugated main pipe (56). 6
The main liquid side branch pipe (54) is the gas side main pipe (54a) connected to the -10,000 switching port in the four-way switching valve (51).
) are six gas side branch pipes connected to the gas side main pipe (54). Note that (55) is a liquid receiver, (56) is an accumulator, and (57) and (58) are a suction pipe and a discharge pipe, respectively.

Also, (58) is each indoor unit (B), CC), (D)
These user-side heat exchangers (5
8) is connected via a communication pipe between the six pairs of corrugator branch pipes (53a) and gas side branch pipes (54a) provided in the outdoor unit (A).

Therefore, the above-mentioned air-conditioning device has each of the above-mentioned wave branch pipes (55a).
By interposing a forward and reverse flow type electric expansion valve (59) in the air conditioner and adjusting the opening degree of the expansion valve (59), the suction at the outlet side of the user side heat exchanger (5B) during cooling operation is reduced. The degree of superheating of the gas, and during heating operation, the heat source side heat exchanger (5
2) To control the degree of superheating of the suction gas on the outlet side, an on-off valve (6O) is interposed in each gas side branch pipe (54a), and the on-off valve (60) is opened/closed. This allows each indoor unit (B), (C), and (D) to be operated and stopped individually.

By the way, in the conventional device configured as described above, firstly, even during heating operation, each indoor unit (B), (1, (
D) In order to perform the operation and stop operation for each gas side branch pipe (54a), an expensive on-off valve (6O) must be provided for each gas side branch pipe (54a), which not only makes the piping work complicated, but also There is a problem that manufacturing costs are high, and secondly, during heating operation, any indoor unit (B), (
When the on-off valve (60) corresponding to the unit (for example, B) is closed in order to stop the operation of C) and (D), a large amount of refrigerant leaks from the on-off valve (60). To,
The user-side heat exchanger (5) of this stopped indoor unit (B)
8) also had the problem of liquid pooling.

(Object of the Invention) The present invention was invented in view of these problems.The purpose of the present invention is to control the degree of superheating of intake gas in cooling operation, especially in the conventional manner, by using the expansion valve (hereinafter referred to as an electric valve). By controlling the degree of supercooling of the condensate refrigerant in the heat exchanger on the user side during heating operation, we can eliminate the on-off valves that were installed in the gas side branch pipe. ,
It is possible to start and stop each indoor unit not only during cooling operation but also during heating operation, and also solves the problem of liquid accumulation in the user side heat exchanger in the stopped indoor unit during heating operation. The point is to do it like this.

(Structure of the Invention) On the other hand, the structure of the present invention is to combine one outdoor unit equipped with a compressor, a four-way switching valve, and a heat exchanger on the heat source side with a plurality of units equipped with heat exchangers on the user side. In a multi-room air conditioning system that connects indoor units, a plurality of corrugator branch pipes connected to the corrugator main pipe of the outdoor unit are equipped with motor-operated valves whose opening degree can be electrically adjusted. A degree detector and a supercooling degree detector are provided, and each of the detectors is electrically connected so that the electric valve becomes an overheated skin adjustable expansion valve during cooling operation and a supercooled skin adjustable expansion valve during heating operation. When an arbitrary indoor unit is stopped during heating operation, and the amount of heat released in the user-side heat exchanger of the stopped indoor unit is significantly reduced, in order to maintain the degree of subcooling of the condensate refrigerant at a desired value, The motor-operated valve corresponding to the indoor unit on the stop side is operated to the closing side, and the amount of refrigerant flowing into the unit can be suppressed to an extremely small amount, and at the same time, the motor-operated valve is opened slightly in response to the degree of supercooling. This makes it possible to maintain the temperature and prevent liquid from accumulating in the user-side heat exchanger that is installed in the stopped indoor unit.

(Example) Embodiments of the present invention will be described below with reference to FIG.

The one shown in Figure 1 has 6 units in one outdoor unit (A).
This is a multi-room air conditioning system in which indoor units (B), (C), and (D) are connected in parallel to perform cooling and heating operations.

The outdoor unit (A) includes a compressor (1), a heat source side heat exchanger (2) equipped with an external fan (not shown), and each of the indoor units (B), CG), and (D). Correspondingly, six electric valves (6) acting as expansion valves are provided,
These devices are connected by piping as described below using a four-way switching valve (4) to form a reversible cycle.

That is, the compressor (1) has a suction pipe (5) and a discharge pipe (6).
and the other ends of these pipes (5) and (6) are respectively connected to a pair of fixed ports of the four-way switching valve (4). A first gas pipe (7) communicating with the heat source side heat exchanger (2) is connected to the pair of switching ports.
) and the gas-side main pipes (9) that are connected to the user-side heat exchangers (8) of the indoor units (B), (C), and (D). Further, each of the user-side heat exchangers (
8) is connected to the wave device main pipe (10) which is the other connection side. Furthermore, the gas side main pipe (9), the corrugated main pipe (10)
), six gas side branch pipes C9&) and wave branch pipes (10
a) is connected. Then, each wave branch pipe (10a
), each of the electric valves (6) is interposed therein, as will be described in detail later.

In addition, each of the indoor units (B) is equipped with an indoor fan (
The user-side heat exchanger (8) attached with the heat exchanger (8) (70) is installed inside, and these heat exchangers (8)-(outdoor unit) (A)
The six sets of gas side branch pipes (9a) and wave branch pipes (1
oa) via connecting pipes (11) to form a refrigerant circuit.

In addition, in the outdoor unit (A), (12) is a liquid receiver,
(16) is a dryer, (14) is an on-off valve, (6o) is an accumulator, and (61) is an auxiliary accumulator.

Then, by switching the four-way switching valve (4), the first
This makes it possible to form a heating operation cycle shown by the solid line arrow (a) and a cooling operation cycle shown by the dotted line arrow (b).

Therefore, in the multi-room air conditioning system configured as above, firstly, the electric valve (6) is of a forward and reverse flow type, and is equipped with a stepper motor or a solenoid so that the opening and opening of the valve can be electrically adjusted. 10,000, using the motor-operated valve (6).
) may be of thermoelectric type. ) During cooling operation in the second and outer unit (A),
The system is constructed as follows so that the degree of superheating of the suction gas and the degree of subcooling of the condensate refrigerant during heating operation can be detected electrically. That is, in (■ ¥ unit) (A), first, during cooling operation, the saturation temperature equivalent to the pressure of the intake gas (
A detection circuit (15) is provided for detecting the refrigerant evaporation temperature (refrigerant evaporation temperature) and also detecting the refrigerant condensation temperature during heating operation. An auxiliary heat exchanger (16) is installed in parallel on the windward side of (2),
The artificial side of this heat exchanger (16) is connected to the discharge pipe (6),
Also, there is a capillary tube (17) on the outlet side for adjusting the flow rate.
It is connected to the suction pipe (5) through. This (
In the auxiliary heat exchanger (16) in the detection circuit (15), the refrigerant can be condensed at approximately the same pressure as in the user-side heat exchanger (8) during heating operation;
On the exit side of the capillary tube (17),
The liquid refrigerant can be evaporated by the pressure of the suction gas, and therefore the saturation temperature and condensation temperature corresponding to the pressure of the suction gas can be detected. D. During cooling operation, a degree of superheat detector is provided to detect the degree of superheat of the suction gas on the outlet side (gas side branch pipe (9a)) of each user side heat exchanger (8), and this detection The device includes a first temperature detector (18) provided on the outlet side of the capillary tube (17) in the detection circuit (15) to detect the pressure-equivalent saturation temperature of the suction gas, and each user-side heat exchanger ( 8), a second temperature detector (1
9), so that the degree of superheating of the suction gas can be detected for each user-side heat exchanger (8) from the detected temperatures of the first temperature detector (18) and each second temperature detector (19). It has become.

Further, during heating operation, a degree of supercooling detector is provided to detect the degree of supercooling of the condensed liquid refrigerant for each of the user-side heat exchangers (8), and specifically, this detector is configured to: In order to detect the condensation temperature of the refrigerant, a sixth temperature detector (2O) provided on the outlet side of the auxiliary heat exchanger (16) in the detection circuit (15), and each user-side heat exchanger (8). In order to detect the temperature of the condensate refrigerant on the outlet side of the
10a), and a fourth temperature detector (21) provided on the user side heat exchanger (8) side of the electric valve (6) in 10a), and these sixth and fourth temperature detectors (20), (21) )
The degree of supercooling of the condensed liquid refrigerant for each user-side heat exchanger (8) can be detected from each detected temperature.

Furthermore, sixthly, the superheat degree detector and the supercooling degree detector are electrically connected to each electric valve (6), and the electric valve (6)
is configured to function as a superheat variable adjustment type expansion valve for each intake gas during cooling operation, and as a subcooling variable type expansion valve during heating operation. A temperature adjustment controller (not shown) is connected, and the 11A degree detector (18) and each of the indoor units (E), (C), and (D) are connected to these controllers, respectively. The corresponding second temperature detectors (19) are connected by wiring (not shown), and the fifth temperature detectors (2C1) are connected to the corresponding fourth temperature detectors (21) in the same manner as above. During cooling operation, each of the controllers inputs the outputs of the first and second temperature detectors (18) and (19), and inputs the overheated intake gas to each electric valve (6). The controllers output a control signal for adjusting the valve opening degree to keep the temperature constant, and during heating operation, the controllers are sixth and fourth temperature detectors (20).

The output of (21) is inputted, and a control signal is similarly outputted to the electric valve (3) to adjust the valve opening so as to control the degree of subcooling of each condensate refrigerant to a constant level. There is.

The reason why the outdoor unit 1-(A) is provided with the detection circuit (15) is that the first, 6 temperature detectors (18), (20) on the user side heat exchanger (8) side, that is, indoor units (B), (C), (D
) It is not necessary to set the temperature on the outdoor unit
(A) side, and from this I, each of the electric valves (6) and the first and sixth temperature detectors (
19), (21) connection for signal transmission
The main point is that all the components are installed inside the outdoor unit (A).

The operation of the multi-room air conditioning system configured as described above will be explained.

First, indoor units) (B), (C), (D) during heating operation
) are all operated.

When the compression m(1) is driven, the first
The refrigerant circulates as shown by the solid arrow (a) in the figure, and the compressor (
The high-pressure gas refrigerant discharged from the first tank is condensed in each of the user-side heat exchangers (8), becomes high-pressure condensed liquid refrigerant, and reaches each of the electric valves (6). As described above, the opening degree of each type of valve (6) is individually adjusted so as to control the degree of subcooling of each condensed liquid refrigerant to a desired value, Then, this low-pressure liquid refrigerant is evaporated in the heat source side heat exchanger (2) and sucked into the compressor (1) again.

From this state, any one indoor unit (B),'(
C) and (D), for example, the case where the operation of the indoor unit (B) is stopped will be explained.

In this case, by stopping the indoor fan (70) of the indoor unit 1-(B) and preventing heat exchange in the user-side heat exchanger (8), the user-side heat exchanger (8) of the indoor unit 1-(B) is stopped. The amount of heat dissipated by the exchanger (8) is only natural heat dissipation, which is extremely small, and as a result, the electric valve (6) is almost fully opened to maintain the degree of subcooling at the desired value, and the indoor unit l- The amount of refrigerant circulating in (B) is also extremely small.

However, as described above, since the electric valve (6) is configured to maintain the degree of subcooling at a desired value, it is not completely closed, but maintains a slight opening, and the user side heats up. A small amount of refrigerant is circulated through the exchanger (8), and as a result, liquid accumulation in the user-side heat exchanger (8) can be reliably prevented.

Next, during cooling operation, all indoor units 1-(B).

By switching the four-way switching valve (4), which will be explained in connection with the operation of (C) and (D), a refrigerant circuit is formed as shown by the dotted line arrow (B) in Figure 1, and the compressor (1) is operated. ) and at the same time actuate each electric valve (6) as a superheat variable expansion valve, normal cooling operation can be performed.

Also, from this state, any indoor unit 1-(B)・(0
)・(D) For example, when stopping the indoor unit (B), stop the indoor fan of the cough unit (B), and at the same time cut off the electricity to the electric valve (6) and remove the valve (6).
) is fully closed. By doing so, the circulation of the refrigerant to the indoor unit (B) is also stopped.

(Effects of the Invention) As described above, the present invention provides the following advantages:
A motor-operated valve (6) whose opening degree can be electrically adjusted is provided, and superheat degree detectors (18), (19) and superheat degree detectors (2O), (21) are provided. Electric valve (6)
becomes a superheat adjustment type expansion valve during cooling operation, and becomes a supercooling adjustment type expansion valve during heating operation (each of the above-mentioned detectors (18)
), (19), (20), (21) Since these are electrically connected, there is no need to install an on-off valve on each gas side branch pipe (9a) as in the past, and each gas can be used during cooling and heating operations. You can start and stop each indoor unit (B), (C), and (D).
Moreover, the indoor unit (B), which is stopped during heating operation, (
The problem of liquid accumulation occurring in the user-side heat exchanger (8) in C) and CD) can also be solved at the same time.

[Brief explanation of the drawing]

FIG. 1 is a refrigerant circuit diagram of an embodiment of the present invention, and the second factor is a refrigerant circuit diagram of a conventional example. (1)...Compressor (2)...Heat source side heat exchanger (6)...Electric valve (4)...Four-way switching valve (8)...Using side heat exchanger (1O )...Wave main (10,) ---Wave branch <21),! 1M11j□, ) 1lf47'#
nK S lJi A(A)--Outdoor unit

Claims (1)

[Claims] (1) One outdoor unit (A) equipped with a compressor (1), a four-way switching valve (4), and a heat source side heat exchanger (2), and multiple units equipped with a user side heat exchanger (8) indoor unit (B),
In a multi-room air conditioning system that connects (C) and (D),
A plurality of corrugator branch pipes (10a) connected to the corrugator main pipe (10) of the outdoor unit (A) are interposed with electrically operated valves (6) whose valve openings can be electrically adjusted. Detectors (18), (19) and supercooling degree detectors (20), (2
1), and each of the detectors (18), (19), (20
), (21).