JPS645716Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a device for filling refrigerant into air-conditioning equipment, etc., which eliminates waste of refrigerant during discharge operations and enables economical use. It is designed to prevent harm to the human body and the occurrence of pollution.

In conventional refrigerant filling equipment, during refrigerant filling work, the refrigerant existing in the air conditioner is released into the air and then filled with new refrigerant, which can cause refrigerant to be released into the atmosphere and cause pollution. However, there is waste due to the waste of refrigerant, which is uneconomical.

Accordingly, this invention enables the refrigerant to be recovered and reused without being released into the atmosphere, and examples thereof will be described below with reference to the drawings.

1 is a cooling device shown as an example of a device to be filled, and is equipped with a compressor 2, an evaporator 3, a condenser 4, an air blower 5, etc. A low pressure service valve 6 is provided in the low pressure side pipe L of the compressor 2, and a high pressure A high-pressure service valve 7 is provided in the side pipe H so that the refrigerant can be discharged and filled.

Reference numeral 8 denotes a refrigerant filling device according to the present invention, in which a low pressure service joint 9 is connected to the low pressure service valve 6 and communicated with the low pressure side of the compressor 2 via a pipe line 14, and the refrigerant pressure and vacuum on this low pressure side are connected. A low pressure compound gauge 10 for displaying the temperature is exposed on the front. A high-pressure service joint 15 is connected to the high-pressure service valve 7, which communicates with the high-pressure side of the compressor 2 via a pipe 17, and a high-pressure compound gauge 16 that displays the refrigerant pressure and degree of vacuum on the high-pressure side. is exposed at the front.
The pipe line 14 includes a filter 11 for filtering the refrigerant discharged from the low-pressure service valve 6, and a solenoid valve 12 for evacuation, and is connected to a vacuum pump 13.

Reference numeral 18 denotes a liquid tank, which is formed in a closed structure so as to be able to store refrigerant with an appropriate volume. 19 is a refrigerant container for storing refrigerant liquid;
It is screwed onto a charge valve 20 located above the liquid tank 18 and opened, allowing the refrigerant liquid to flow down into the liquid tank 18. 21 is a refrigerant container 19
This is a solenoid valve that controls the outflow of refrigerant from the liquid tank 18. It is controlled by a level switch 22 provided in the liquid tank 18, and operates to maintain a constant amount of refrigerant in the liquid tank 18. Reference numeral 23 denotes a float for the level switch 22, which moves up and down depending on the level of the refrigerant in the liquid tank 18, and turns on/off a reed switch (not shown) internally disposed on a guide rod 24 of the float 23.

A heat exchanger 25 is connected to the liquid tank 18 via a solenoid valve 32, and functions as an evaporator to evaporate the refrigerant liquid in the liquid tank 18 during refrigerant filling. Fill to 1. Therefore, at the time of refrigerant filling, the solenoid valve 32 and the filling solenoid valve 26 are opened, and a refrigerant filling flow path b via the heat exchanger 25 is formed. A compressor 28 is connected to the pipe line 14 via a recovery electromagnetic valve 27, and compresses and liquefies the refrigerant discharged from the cooling device 1 during refrigerant recovery and sends it to the liquid tank 18. functions as a condenser to condense the refrigerant. Therefore, at the time of refrigerant recovery, the recovery solenoid valve 27 and the solenoid valve 32 are opened, and a refrigerant recovery flow path a is formed via the compressor 28.

29 is the compressor 2 from the upper part of the liquid tank 18
A conduit 30 leading to the low pressure side L of 8 is a refrigerant circulation solenoid valve provided in the conduit 29. When the solenoid valve 30 is opened, a refrigerant circulation path c is formed. This refrigerant circulation flow path c is used when the atmospheric temperature of the liquid tank 18 is high and the pressure of the refrigerant gas phase above the tank 18 increases, making it difficult to smoothly flow down the refrigerant from the refrigerant container 19 or recover the refrigerant. Gas phase refrigerant is transferred to compressor 2
8, the liquid is further compressed, liquefied in a heat exchanger 25, and returned to the liquid tank 18.

Next, an electric circuit for controlling the operation of the refrigerant charging device 8 will be explained using FIG. 2. 33 is a power supply, 34 is a power switch, and 35, 36, and 37 are timer switches. If the cooling device 1 has not yet been filled with refrigerant and you want to refill it, first turn on the timer switch 35, open the solenoid valve 12 for a predetermined period of time, and operate the vacuum pump 13. Vacuum the refrigerant pipes inside. Next, the timer switch 36 is turned on and the solenoid valve 32 and the refrigerant charging solenoid valve 2 are turned on again for a predetermined period of time.
6 and open the refrigerant filling channel b to pre-fill the cooling device 1 with refrigerant, then turn on the timer switch 37 and open the solenoid valve 32 and the refrigerant recovery solenoid valve 27 for a predetermined time. At the same time, the compressor 28
is operated to open the refrigerant recovery channel a, and the pre-filled refrigerant is recovered into the liquid tank 18.
Furthermore, turn on the timer switch 35 again to perform vacuuming, and then turn on the timer switch 36.
Then, perform the main charging of refrigerant.

In addition, if the cooling device 1 is already filled with refrigerant and this refrigerant is to be replaced, the timer switch 37 is turned ON prior to the above operation, and the refrigerant recovery flow path a is opened to remove the refrigerant from the inside of the cooling device 1. The discharged refrigerant may be collected into the liquid tank 18 and the above operations may be continued.

Reference numeral 38 denotes a circulation switch that circulates the refrigerant using the refrigerant circulation path c, and is normally held in the state shown in the figure, and when turned on as necessary, opens the refrigerant circulation solenoid valve 30 and compresses the refrigerant. The refrigerant circulation channel c is brought into a functional state by operating the machine 28.

This invention is constructed as described above, and most of the refrigerant discharged from the air conditioner during refrigerant filling work can be recovered into the liquid tank in the refrigerant recovery channel, and a large amount of refrigerant can be pumped into the atmosphere as in the past. There is no risk of causing pollution as it does not emit into the air. In addition, the refrigerant recovered into the liquid tank can be refilled into the cooling device in the refrigerant filling channel, and a large amount of refrigerant is not wasted, making it possible to perform an economical filling operation.

[Brief explanation of drawings]

FIG. 1 is a configuration explanatory diagram of an embodiment of the present invention, and FIG. 2 is an electric circuit diagram of the same embodiment. 1 is a cooling device which is a device to be filled, 2 is a compressor, 8 is a refrigerant filling device according to the present invention, 18 is a liquid tank, 19 is a refrigerant container, 25 is a heat exchanger that functions as a condenser when recovering refrigerant and as an evaporator when filling refrigerant. vessel, 26,2
Reference numeral 7 designates a refrigerant charging solenoid valve and a refrigerant recovery solenoid valve as flow path switching means, 28 a compressor, a a refrigerant recovery flow path, and b a refrigerant charging flow path.

Claims (1)

[Scope of utility model registration request] A liquid tank for storing refrigerant liquid is provided, and a refrigerant recovery channel is connected to the low pressure side of the compressor of the device to be filled and leads to the liquid tank via the compressor and the condenser, and from the liquid tank to the low pressure side of the compressor via the evaporator. A refrigerant filling device comprising a refrigerant filling channel and a means for switching between the two channels to collect refrigerant discharged from a device to be filled into a liquid tank and refill the liquid tank with the collected refrigerant.