JPS6136133Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to improving the refrigeration cycle of an air conditioner that adjusts its capacity, and one of its objectives is to save energy by improving the coefficient of performance, especially during stable operation. be.

Conventionally, the refrigerant circuit in this type of air conditioner is configured as shown in FIG. It flows through evaporator e and compressor a. At this time, the first two-way valve f is open, the second two-way valve g is closed, and the capacity adjustment valve h
is closed with high pressure liquid refrigerant. In addition, during the capacity adjustment cooling circuit, the refrigerant is in the compressor a, condenser b,
It flows into a basic circuit consisting of a capillary tube d, an evaporator e, and a compressor a, and a bypass circuit consisting of a compressor a, a capacity control valve h, a second two-way valve g, and a compressor a. At this time, the first two-way valve f is closed and the second two-way valve g is opened.

Therefore, in the case of the capacity adjustment cooling circuit, a part of the refrigerant whose pressure has been reduced in the second capillary tube d is transferred from the first capillary tube c to the second two-way valve g.
Since the evaporator e flows into the compressor a through the evaporator e, the capacity of the evaporator e cannot be maximized, resulting in a large loss. This led to a decline in the coefficient of performance. Furthermore, since a slightly moist refrigerant that does not completely evaporate is always sucked into the compressor a, there is also a problem in terms of the lifespan of the compressor itself.

This invention solves the problems found in the refrigeration cycle of air conditioners equipped with the conventional capacity adjustment described above. Out of the effective and inactive parts of the depressurized refrigerant, only the effective part is used to increase the cooling capacity. The idea is to further reduce the pressure and return the ineffective components to the compressor, which will help improve the coefficient of performance.

Hereinafter, the present invention will be explained with reference to FIG. 1 of the accompanying drawings showing one embodiment thereof.

In the same figure, 1 is a compressor, 2 is a condenser, and 3a
is the first capillary tube, 4 is the gas-liquid separator, and 5 is the first capillary tube.
is an evaporator, and the basic refrigerant circuit is constructed by connecting these in a ring. 6 is a first two-way valve that connects the condenser 2 and the first capillary tube 3;
It is provided between a. Here, the compressor 1
is a cylinder 1a and a piston 1 having an eccentric shaft.
b, a vane 1c that partitions the inside of the cylinder into high pressure and low pressure, a suction hole 1d that guides the refrigerant into the cylinder, a discharge hole 1e that discharges the refrigerant from inside the cylinder, and a bypass located between the discharge hole 1e and the suction hole 1d of the compression mechanism. The hole 1f and the bypass hole 1f are closed when the pressure is high (when the refrigerant flows from x to y), and when the pressure is low (from y to z).
The compressor consists of a capacity control valve 1g that opens when refrigerant flows) and a capacity control valve 1h that extends outward from the capacity control valve 1g. In addition,
A capacity control pipe 1h extending outward from the compressor is also connected to the downstream end of the first two-way valve 6 via a high-pressure pipe 8. 3b is a second capillary tube, which is connected in parallel with the series circuit consisting of the first two-way valve 6 and the first capillary tube 3a, and the outlet sides of both the first and second capillary tubes 3a and 3b are It is connected to the gas side of the gas-liquid separator 4. Note that the inlet side of the evaporator 5 is connected to the liquid side of the gas-liquid separator 4. Reference numeral 7 designates a second two-way valve that bypasses the capacity control pipe 1h and the suction side of the compressor 1.

In the above configuration, the refrigerant circuit during the standard cooling circuit includes the compressor 1, the condenser 2, the first capillary tube 3a and the second capillary tube 3b, the gas-liquid separator 4, the evaporator 5, and the compressor 1. . At this time,
The first two-way valve 6 is open, the second two-way valve 7 is closed, and the capacity control valve 1g is closed by high-pressure liquid refrigerant. In addition,
Since the first capillary tube 3a and the second capillary tube 3b form a parallel circuit, the total depressurization amount of both capillary tubes 3a, 3b is set to a value that provides the maximum capacity.

In addition, the refrigerant circuit during the capacity adjustment cooling circuit includes a compressor 1, a condenser 2, a second capillary tube 3b,
It consists of a basic circuit including a gas-liquid separator 4, an evaporator 5, and a compressor 1, and a bypass circuit including a compressor 1, a capacity control valve 1g, a second two-way valve 7, and a compressor. At this time, the first two-way valve 6 is closed and the second two-way valve is opened. The amount of pressure reduction in the second capillary tube 3b is selected so that the coefficient of performance during the capacity adjustment cooling circuit is maximized. As a result, a part of the gas sucked by the compressor 1 escapes from the capacity control valve 1g via the second two-way valve 7, so the amount of gas to be compressed decreases and the work of the compressor 1 is reduced. rate is suppressed,
Capacity, input decreases.

Therefore, according to the configuration of the refrigerant circuit, the second capillary tube 3b is
The refrigerant is once separated into gas and liquid by the gas-liquid separator 4, the liquid goes to the evaporator 5, and the gas is depressurized by the first capillary tube 3a and then sent to the second capillary tube 3a.
It is sucked into the compressor 1 via the two-way valve 7. As a result, the effective portion (liquid) of the reduced pressure refrigerant is guided to the evaporator 5 by the gas-liquid separator 4, so that it is completely evaporated.
It becomes possible to use the evaporator 5 effectively. The reactive component (gas) is further reduced in pressure by the first capillary tube 3a, and the compressor 1
Since dry gas is returned to the compressor 1, the coefficient of performance is improved without adversely affecting the life of the compressor 1, and extremely effective energy-saving operation becomes possible. In addition, since the refrigerant guided to the first capillary tube 3a is only a gas component, the depressurization effect is greater than that of a liquid component, and the amount of refrigerant returned to the compressor 1 through the first capillary tube 3a is smaller than that of the conventional example. It will be less compared to.

In this embodiment, the capillary tubes 3a and 3b are used as pressure reducing devices, but similar effects can be expected even if an expansion valve is used.

Further, in this embodiment, the two-way valves 6 and 7 which are opened when energized are used as the refrigerant circuit switching device, but similar effects can be expected with a refrigerant switching circuit which is closed when energized.

As is clear from the above embodiment, in the refrigeration cycle of the air conditioner according to the present invention, in a refrigerant circuit having a capacity control valve, high-pressure refrigerant flows to a plurality of pressure reducing devices and a capacity control valve during the standard cooling circuit; During the regulating cooling circuit, high-pressure liquid refrigerant is passed through one of the pressure reducing devices. In particular, during the capacity regulating cooling circuit, the refrigerant reduced in pressure by the pressure reducing device is separated into an effective portion (liquid) by a gas-liquid separator. ) and the reactive component (gas), the liquid is sent to the evaporator, the gas is sent to the other pressure reducing device, and then returned to the compressor, thereby making effective use of the evaporator and refrigerant. This improves the coefficient, which makes it possible to operate in an energy-saving manner, and because some of the refrigerant does not return to the compressor as wet or liquid as in the past, it is beneficial to the life of the compressor. It will be done.

[Brief explanation of the drawing]

FIG. 1 is a refrigerant circuit diagram of an air conditioner according to an embodiment of the present invention, and FIG. 2 is a refrigerant circuit diagram of a conventional air conditioner. 1...Compressor, 1d...Suction hole, 1e...Discharge hole, 1f...Bypass hole, 1g...Capacity control valve,
1h...Capacity control pipe, 2...Compressor, 3...First
Capillary tube (pressure reducer), 3b... Second capillary tube (pressure reducer), 4... Gas-liquid separator, 5... Evaporator, 6... First two-way valve, 7... Second second Directional valve, 8...High pressure pipe.

Claims (1)

[Scope of utility model registration request] In a refrigeration cycle in which a compressor 1, a condenser 2, a first two-way valve 6, a first pressure reducer 3a, a gas-liquid separator 4, and an evaporator 5 are connected in a ring, the compressor 1 is connected to a discharge hole 1e. It has a bypass hole 1f provided between the suction holes 1d and a capacity control valve 1g that opens and closes the bypass hole 1f.
A compressor with a capacity adjustment function has a capacity control pipe 1h extending outward from the compressor f and connected between the evaporator 5 and the suction hole 1d of the compressor 1, and the capacity control pipe 1h has a capacity control pipe 1h. A high-pressure pipe 8 is provided between the second two-way valve 7 and the capacity control valve 1g, and one end of which is connected between the first two-way valve 6 and the first pressure reducer 3a. The other end of the second pressure reducer 3b, which has one end connected between the condenser 2 and the first two-way valve 6, is opened to the gas side of the gas-liquid separator 4. When the first two-way valve 6 is opened and the second two-way valve 7 is closed, the capacity is high, and when the first two-way valve 6 is closed and the second two-way valve 7 is opened, the capacity is low. The refrigeration cycle of an air conditioner.