JPH08114364A - Refrigerant recovering device - Google Patents

Abstract

PURPOSE: To protect a compressor in a refrigerant recovering device for recovering refrigerant from a collected device by a method wherein judgement of stopping in recovering operation is carried out under a combination of a pressure switch and a time counting means. CONSTITUTION: In a refrigerant recovering device in which refrigerant fed from a recovering device A is passed through an evaporator 7, gasified there and then compressed by a compressor 11, condensed, liquified by a condensor 14 and recovered into a container 21, there is provided a means 23 for counting time starting from the recovering operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerant recovery device for recovering a refrigerant from a recovery target device such as an air conditioner or a refrigerator and storing it in a container.

[0002]

2. Description of the Related Art Most of the CFCs conventionally used as refrigerants in air conditioners and refrigerators have been released into the atmosphere.

However, according to recent theories, it is considered that the amount of ultraviolet rays that reach the earth from the sun increases due to the destruction of the ozone layer by the chlorofluorocarbon, which promotes global warming.

Along with this, there is an increasing demand for restricting the release of CFCs into the atmosphere, and there is a demand for a refrigerant recovery device that can efficiently recover the refrigerant from the air conditioner, the refrigerator or the like. Has been done.

A conventional refrigerant recovery device will be described below with reference to FIG. In FIG. 2, reference numeral 1 denotes a connecting portion connected to the refrigerant-to-be-recovered object A such as an air conditioner, which is a hose for taking in the refrigerant of the refrigerant-to-be-recovered object A. Reference numeral 2 is a filter for preventing the inflow of impurities from the material to be recovered A. Reference numeral 3 is a pressure switch for stopping the operation of the refrigerant recovery device when the recovery is completed. Reference numeral 4 is a pressure gauge for displaying the pressure inside the object to be recovered. Reference numeral 5 is a dryer for removing the water content of the recovered refrigerant. Reference numeral 6 is a capillary tube for decompressing the gas-liquid mixed refrigerant discharged from the object to be recovered A. Reference numeral 7 is an evaporator for vaporizing the refrigerant decompressed by the capillary tube 6. Reference numeral 8 denotes an oil separator, which separates the oil component in the refrigerant. A check valve 9 serves to prevent the high-pressure side refrigerant of the compressor 11 from flowing into the object A to be recovered when the recovery is completed. An accumulator 10 is a tank for preventing the liquid refrigerant from entering the compressor 11. Reference numeral 11 denotes a compressor for collecting and compressing a gaseous refrigerant flowing from the suction port and discharging it as a high-temperature high-pressure gas from the discharge port. Reference numeral 12 is an oil separator for separating refrigerating machine oil discharged from the compressor 11. Reference numeral 13 is a return line for returning the oil component separated by the oil separator 12 to the inlet of the compressor 11. Reference numeral 14 denotes a heat exchanger, which is a condenser that liquefies the gas refrigerant compressed by the compressor 11. Reference numeral 15 denotes a fan, which is for blowing air to the surface of the condenser 14 in order to radiate the heat of the refrigerant passing through the condenser 14. 1
A fan motor 6 is for rotating the fan 15. A check valve 17 is provided to prevent the liquid refrigerant filled in the refrigerant recovery cylinder 21 from being vaporized and flowing back to the condenser 14 side. Reference numeral 18 is a pressure gauge for displaying the pressure inside the recovery cylinder. Reference numeral 19 is a safety valve for automatically discharging the pressure in the recovery cylinder when the pressure in the recovery cylinder rises abnormally. Reference numeral 20 is a hose that connects the recovery device body and the refrigerant recovery cylinder. Reference numeral 21 is a refrigerant recovery cylinder for storing a liquid refrigerant. Reference numeral 22 is a weight scale for managing the weight of the refrigerant recovered from the object A to be recovered by mounting the refrigerant recovery cylinder 21.

[0006]

However, in the above-mentioned conventional configuration, since the completion of recovery is determined by the pressure switch 3, even the same object to be recovered may be recovered depending on the ambient temperature at the time of recovery. Efficient recovery cannot be performed due to variations in time and recovery amount. That is, when the outside air temperature is low, the collection time is short but the collection amount is small. When the outside temperature is high, the collection amount is large, but the collection time is long. Then, when the outside temperature is high, the compressor is damaged by operating the compressor for a long time.

The present invention solves the above-mentioned conventional problems, and provides a refrigerant recovery device having the function of forcibly completing the recovery operation when the pressure switch does not work within a certain time after the start of recovery. To do.

[0008]

In order to solve the above-mentioned problems, the present invention has a time counting means from the start of collection, and judges whether or not the collection is completed by the pressure inside the object to be collected and the time counting means.

[0009]

According to the refrigerant recovery device having the above structure, the recovery operation is completed and the compressor can be protected even when the pressure switch does not work.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A refrigerant recovery device according to an embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, 1 is a charge hose,
2 is a filter, 3 is a pressure switch, 4 is a pressure gauge, 5 is a dryer, 6 is a capillary tube, 7 is an evaporator, 8 is an oil separator, 9 is a check valve, 10 is an accumulator, 11 is a compressor, 12 is Oil separator, 13 return line, 14 condenser, 15 fan, 16 fan motor, 17 check valve, 18 pressure gauge, 19 safety valve, 2
Reference numeral 0 is a hose, 21 is a refrigerant recovery cylinder, and 22 is a weight scale, which has the same configuration and function as those shown in FIG. Further, it is provided with a clocking means 23 for measuring the elapsed time from the start of collection.

In the thus constructed refrigerant recovery device, the refrigerant recovery completion determination is determined when either the pressure switch 3 signal or the timing means 23 signal is activated.

[0013]

As is apparent from the above description, the present invention prevents the compressor from being damaged by installing the clocking means without operating the compressor for a certain period of time or longer.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a refrigerant recovery device as an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a conventional refrigerant recovery device.

[Explanation of symbols]

 A Recovery device 1 Hose 2 Filter 3 Pressure switch 4 Pressure gauge 5 Dryer 6 Capillary tube 7 Evaporator 8 Oil separator 9 Check valve 10 Accumulator 11 Compressor 12 Oil separator 13 Return line 14 Condenser 15 Fan 16 Fan motor 17 Check valve 18 Pressure gauge 19 Safety valve 20 Hose 21 Recovery cylinder 22 Weight scale 23 Timing means

Claims (1)

[Claims] 1. A connection part for connecting to a recovery object storing a refrigerant, a vaporization part for evaporating the recovered refrigerant, a compressor for compressing the refrigerant, and a refrigerant discharged from the compressor. A refrigerant recovery device comprising a condensing part and a container part for storing condensed liquid refrigerant, the refrigerant recovery device having a clocking means from the start of recovery of the recovery target.