JPS61153457A - Gas injection system 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 Field of the Invention The present invention relates to a gas injection type air conditioner.

Conventional configuration and its problems A conventional embodiment will be described with reference to FIG.

Figure 2 shows a refrigeration cycle diagram of a conventional gas injection type air conditioner, in which 1 is a compressor, 2 is a condenser, and 3 is an evaporator, which are connected in a ring with a refrigerant pipe 4 to form a refrigeration cycle. There is. The pressure is reduced to an intermediate pressure between the condenser 2 and the evaporator 3, and the first pressure reducer 5 is used to separate the gaseous refrigerant and the liquid refrigerant. It is connected to a gas-liquid separator 6 for storing the separated refrigerant. A second pressure reducer 7, which acts as an expander for expanding the liquid refrigerant separated by the gas-liquid separator 6 and stored in the lower part and guiding it to the evaporator 3, is connected to the evaporator 3 by a refrigerant pipe 4.
are connected sequentially. Furthermore, from the upper part of the gas-liquid separator 6,
It is connected to the gas injection introduction part of the compressor 1 through an introduction pipe 9 for guiding gaseous injection refrigerant.

A solenoid valve 1° is provided in the middle of the introduction pipe 9 to control the capacity depending on whether or not gas is injected.

Based on the above configuration, the gas refrigerant generated in the gas-liquid separator 6 is guided to the compressor 1, so the amount of refrigerant discharged by the compressor 1 increases, and the amount of refrigerant circulated in the condenser 2 increases. ,
This increases the load on the condenser 2 side, and is particularly effective as a method for improving heating capacity during heating operation. Further, when the required amount of heating capacity is small, the solenoid valve 1o is closed to stop gas injection.

However, when the solenoid valve 10 is opened to inject gas to improve the capacity, and when the solenoid valve 1o is closed to stop the gas injection, the capacity control width is generally about 16 inches, which reduces the capacity control. There was a problem in that detailed control of the amount could not be performed.

OBJECTS OF THE INVENTION An object of the present invention is to provide a system that reduces the amount of capacity control when performing capacity control using gas injection.

Structure of the Invention In order to achieve this object, the present invention provides a pressure reducer in parallel with a solenoid valve provided in a gas injection introduction pipe.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

Note that the parts indicated by the same reference numerals as those in the conventional example indicate the same parts, and detailed explanation thereof will be omitted.

A solenoid valve 1o is provided in the middle of the introduction pipe 9 leading to the gas injection introduction part 8 of the compressor 1 to control the capacity depending on the presence or absence of the gas injector 3. A pressure reducer 11 is provided.

Next, the operation based on the above configuration will be described.

The refrigerant discharged from the compressor 1 is condensed and liquefied in the condenser 2, and then reduced to an intermediate pressure in the first condenser 6.
It is guided to the gas-liquid separator 6. At this time, the gas and liquid of the refrigerant in the gas-liquid separator e are completely separated. The liquid refrigerant is then led from the lower bottom of the gas-liquid separator 6 to the second pressure reducer 7, where it is further reduced in pressure, evaporated in the evaporator 3, and then transferred to the compressor 1.
form a cycle that returns to

On the other hand, the gaseous refrigerant led out from the upper part of the gas-liquid separator e is branched into the direction of the solenoid valve 10 and the direction of the third pressure reducer 11 via the introduction pipe 9. 10 is open, the gas injection refrigerant is completely guided to the injection introduction part 8 of the compressor 1, and the heating capacity increases.

Furthermore, when the solenoid valve 1o is closed, the gas injection refrigerant passes through the third pressure reducer 11, so the gas injection refrigerant flows slightly and is guided to the injection introduction part 8 of the compressor 1.

In this way, even if the solenoid valve 10 for gas injection opening/closing is completely closed, the gas injection refrigerant cannot flow through the third pressure reducer 11, so the solenoid valve 1o is closed as in the conventional case, and the capacity suddenly decreases. This allows for fine-grained capacity control.

Effect of the invention As described above, according to the present invention, a compressor and a condenser are provided.

The evaporators are connected in a ring, a gas-liquid separator is provided between the condenser and the evaporator, an inlet pipe led out from the gas-liquid separator, and a solenoid valve between the inlet pipe and the injection introduction part. Since the pressure reducer is arranged in parallel, even when the solenoid valve is closed, the gas injection refrigerant flows through the pressure reducer and does not cause a sudden drop in capacity.

Moreover, by changing the resistance value of the pressure reducer,

[Brief explanation of drawings]

FIG. 1 shows a gas injection system 7 showing one embodiment of the present invention.
FIG. 2 is a circuit diagram of a conventional cooling system. 1... Compressor, 2... Condenser, 3...
... Evaporator, 6... Gas-liquid separator, 9...
...Introduction pipe, 10...Solenoid valve, 11...
...Third pressure reducer. Name of agent: Patent attorney Toshio Nakao and 1 other person
1 Figure 2

Claims (1)

[Claims] A cooling system is constructed by connecting a compressor, a condenser, an evaporator, etc. in a ring, a gas-liquid separator is provided between the condenser and the evaporator, and an upper part of the gas-liquid separator and the compressor are connected. A gas injection type air conditioner is provided with an inlet pipe via a solenoid valve between the two, and a pressure reducer in parallel with the solenoid valve.