JPH07103618A - Refrigerant recovery machine corresponding to refrigerator and method for recovering refrigerant - Google Patents

Abstract

PURPOSE:To prevent different refrigerant from being mixed into recovered refrigerant only by exchanging recovery tanks, wherein the recovered gaseous refrigerant is prevented from leaking into the atmosphere. CONSTITUTION:A compressor 1 is operated to draw refrigerant from a connecting part 8a through a suction pipe 9a thereby delivering it into a delivery pipe 5a. The delivered refrigerant is passed through the pipe 5a to be cooled and liquefied at a condenser 2 and passed through a pipe 5b into a liquid recovery vessel 4a, where it is recovered. Thereafter, the compressor 1 is stopped and an on/off valve 16 provided in the pipe 9a is closed and a channel switching valve 17 provided in the pipe 5b is changed over so as to communicate with a branch pipe 18 connected to a gas recovery vessel 19 so that high pressure gaseous refrigerant remaining in the pipe 5a, condenser 2, and pipe 5b is led into the vessel 19 so as to be adsorbed on adsorbents 20 loaded in the vessel 19, thereby recovering it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator-compatible refrigerant recovery machine for recovering a refrigerant corresponding to a refrigerator and a refrigerant recovery method thereof.

[0002]

2. Description of the Related Art In recent years, when a household refrigerator is disposed of or repaired, a refrigerant recovery device is attached to recover the refrigerant in the refrigeration cycle. An example of a conventional household refrigerator is disclosed in Japanese Patent Laid-Open No. 2-208465.

Hereinafter, the conventional refrigerant recovery machine will be described with reference to the drawings.

FIG. 10 is a piping system diagram of a conventional refrigerant recovery machine, wherein 1 is a compressor for sucking the refrigerant, 2 is a condenser provided on the high pressure discharge side of the compressor 1, 3 is a bidirectional diversion or one-way diversion. A three-way valve for flowing only in one direction, 4 is a recovery tank connected to the three-way valve 3 via the condenser 2, 5 is a recovery path connecting the three-way valve 3 and the recovery tank 4 via the condenser 2, and 6 is a charge The port is connected to the three-way valve 3 via the heating passage 7.

Reference numeral 8 denotes a recovery port, which is connected to the three-way valve 3 via a lead-in passage 9. Reference numeral 10 is a valve opening degree control means for controlling the valve opening degree of the three-way valve 3.
The heating degree of the suction gas of the compressor 1 is controlled to be constant. 13
Is a fan provided in the condenser 2, 14 is a pressure reducing pipe that connects the upper portion of the recovery tank 4 and the intake passage 9, and 15 is a recovered side refrigerant circuit, to which the charge port 6 and the recovery port 8 are connected.

The operation of the conventional refrigerant recovery machine configured as described above will be described below.

First, a part of the high-temperature high-pressure discharge gas discharged from the compressor 1 is supplied to the recovered side refrigerant circuit 15 from the charge port 6 through the heating passage 7 through the three-way valve 3,
The evaporation and vaporization of the liquid refrigerant in the recovered side refrigerant circuit 15 is promoted. This evaporated vaporized refrigerant is drawn from the recovery port 8 into the intake passage 9
The refrigerant, which is sucked into the compressor 1 through the three-way valve 3 and is introduced into the heating path 7 through the three-way valve 3, is liquefied by the condenser 2 provided with the fan 13 through the recovery path 5, and the recovery tank. Recovered within 4.

Next, the pressure inside the recovery tank 4 is reduced by the decompression pipe 14, and the flow of the liquid refrigerant flowing out from the condenser 2 is promoted. The temperature detector 11 and the pressure detector 12 detect the heating degree of the intake gas of the compressor 1, and the valve opening control means 10 adjusts the valve opening degree of the three-way valve 3 so that the heating degree becomes constant. The amount of the refrigerant passing through the heating passage 7 is properly maintained, and excessive heating or insufficient heating in the recovered side refrigerant circuit 15 is eliminated.

[0009]

However, since the high-pressure gaseous refrigerant remains in the condenser 2 and the recovery passage 5 in the above-described conventional refrigerant recovery machine, it is necessary to connect the recovery-side refrigerant circuit 15 and the like. The residual high-pressure gaseous refrigerant leaks into the atmosphere,
Even if the recovery tank 4 is replaced when the recovery refrigerant is different, there is a problem that the residual high-pressure gas refrigerant is mixed and recovered.

The present invention solves the conventional problems and is capable of eliminating the leakage of the recovered refrigerant into the atmosphere and preventing the mixing of different refrigerants by simply replacing the recovery tank. And a refrigerant recovery method thereof.

[0011]

In order to achieve the above-mentioned object, a refrigerator-compatible refrigerant recovery machine of the present invention comprises a compressor for sucking the refrigerant to be recovered, a suction pipe provided on the low pressure side of the compressor, A connecting part connected to the suction pipe, an opening / closing valve provided in the middle of the suction pipe, a discharge pipe provided on the discharge side of the compressor, a condenser provided through the discharge pipe, and a condenser of the condenser. A pipe provided on the outlet side, a liquid recovery container provided via this pipe, a flow path switching valve provided in the middle of the pipe, a branch pipe connected to this flow path switching valve, and this branch pipe It is characterized by comprising a gas recovery container provided as above and an adsorbent filled in the gas recovery container.

Further, it is characterized by further comprising: pressure detecting means provided in the suction pipe, and flow passage switching valve control means for switching the flow passage switching valve to the branch pipe based on a signal from the pressure detecting means. To do.

Further, it is characterized by further comprising compressor control means for stopping the compressor based on a signal from the pressure detection means.

A refrigerating machine for a refrigerator according to claim 1, further comprising an opening / closing valve control means for closing the opening / closing valve based on a signal from the pressure detecting means.

Further, a timer circuit that operates in synchronization with the start of the compressor, and a function of controlling the flow path switching valve, the compressor, and the on-off valve based on a signal from the timer circuit after a predetermined time has elapsed. 2. The refrigerator-compatible refrigerant recovery machine according to claim 1, further comprising a component control means.

Further, a connector connected to the power supply terminal of the compressor of the refrigerator, an electric cord connected to the connector, a compressor drive circuit connected to the electric cord, and a compressor provided in the compressor drive circuit. An on / off switch for stopping the operation, a connecting part for connecting to the high-pressure side pipe of the compressor of the refrigerator, a lead-in pipe connected to this connecting part, and a condenser provided through this lead-in pipe, An on-off valve provided in the middle of the intake pipe, a pipe provided at the outlet side of the condenser, a liquid recovery container provided through this pipe, and a flow path switching valve provided in the middle of the pipe, It is characterized by comprising a branch pipe connected to the flow path switching valve, a gas recovery container provided via the branch pipe, and an adsorbent filled in the gas recovery container.

Furthermore, a timer circuit that operates in synchronization with the on / off switch operation, and controls the flow path switching valve, the on / off switch, and the on-off valve based on a signal from the timer circuit after a predetermined time has elapsed. 7. The refrigerator-compatible refrigerant recovery machine according to claim 6, further comprising a functional component control means.

In order to achieve the above-mentioned object, the refrigerant recovery method for a refrigerator-compatible refrigerant recovery machine of the present invention is to connect a connecting part provided on the suction side of a compressor via an on-off valve to a refrigeration cycle pipe of a refrigerator, The compressor is operated, the refrigerant is cooled and liquefied by a condenser provided on the discharge side of the compressor and is collected in a liquid recovery container, the compressor is stopped and the on-off valve is closed, and a flow path switching valve And the residual gas refrigerant is adsorbed by the adsorbent filled in the gas recovery container and recovered.

Further, a connector connected to the power source terminal of the compressor of the refrigerator via a compressor drive circuit and an electric cord is connected, and a connecting part is connected to a high pressure side pipe of the compressor of the refrigerator,
The compressor is operated by turning on / off the switch provided in the compressor drive circuit, and the refrigerant is cooled and liquefied by a condenser provided through the lead-in pipe in the connecting part to be recovered in a liquid recovery container. The compressor is stopped and the on-off valve provided in the middle of the intake pipe is closed, and the flow path switching valve is switched to collect the residual gas refrigerant by adsorbing it to the adsorbent filled in the gas recovery container. Characterize.

[0020]

In the refrigerator-type refrigerant recovery machine of the present invention having the above-described structure, the compressor is operated to suck the refrigerant from the connecting component through the suction pipe and discharge it into the discharge pipe. The discharged refrigerant passes through the discharge pipe, is cooled and liquefied by the condenser, and is collected in the liquid recovery container through the pipe. After that, the compressor is stopped, the on-off valve provided in the suction pipe is closed, and the flow path switching valve provided in the pipe is switched so as to communicate with the branch pipe connected to the gas recovery container. Since the high-pressure gas refrigerant remaining in the inside and the pipe is introduced into the gas recovery container and is adsorbed and recovered by the adsorbent filled in the gas recovery container,
Leakage of the recovered gas refrigerant into the atmosphere is eliminated, and only the gas recovery container and the liquid recovery container are replaced, so there is no mixing of different refrigerants.

Further, the pressure detecting means provided in the suction pipe detects the end of the refrigerant recovery, and the flow passage switching valve control means switches the flow passage switching valve based on the signal from the pressure detecting means, thereby changing the switching time. Waste of working time due to excess and deficiency and inflow of liquid refrigerant into the gas recovery container are eliminated.

Further, by stopping the compressor by the compressor control means on the basis of the signal of the pressure detection means, there is no waste of work time due to excess or deficiency of the compressor operating time, and there is no residual unrecovered refrigerant.

Further, based on the signal from the pressure detecting means, the opening / closing valve control means closes the opening / closing valve almost at the same time as the stoppage of the compressor. And the reverse flow of the recovered refrigerant due to the pressure difference is eliminated.

Further, based on a timer circuit which operates in synchronization with the start of yet another compressor, the functional component control means switches the flow path switching valve after a certain fixed time, and stops the compressor to open / close the valve. By closing, there is no need for pressure detection means or the like.

Also, the connector connected to the compressor drive circuit via the electric cord is connected to the power supply terminal of the compressor of the household refrigerator, and the connecting part connected to the condenser via the lead-in pipe is connected to the compressor. Connect to the high-pressure side pipe, turn on / off the switch provided in the compressor drive circuit to operate the compressor, guide the refrigerant from the connecting parts to the condenser through the lead-in pipe, liquefy the coolant in the condenser, and connect the pipe. It collects in a liquid collection container via. After that, the compressor is stopped, the on-off valve provided in the intake pipe is closed, and the flow path switching valve provided in the pipe is switched so as to communicate with the branch pipe connected to the gas recovery container. And the high pressure gas refrigerant remaining in the pipe is introduced into the gas recovery container, and is adsorbed and collected by the adsorbent filled in the gas recovery container, so leakage of the recovered gas refrigerant into the atmosphere is eliminated, Since only the gas recovery container and the liquid recovery container are replaced, mixing of different refrigerants is eliminated. Moreover, since the compressor on the refrigerator side is used, it is not necessary to provide a compressor.

Further, based on a timer circuit which operates in synchronism with the on / off switch on / off operation, the functional component control means switches the flow path switching valve after a predetermined time, stops the compressor and closes the on-off valve. Since it is set, operation mistakes can be eliminated.

Further, in the refrigerant recovery method of the refrigerator-compatible refrigerant recovery machine of the present invention, the connecting part provided on the suction side of the compressor via the on-off valve is connected to the refrigeration cycle pipe of the domestic refrigerator to operate the compressor. Then, the refrigerant provided in the condenser on the discharge side of the compressor is cooled and liquefied to be recovered in the liquid recovery container, the compressor is stopped and the on-off valve is closed, and the flow path switching valve is switched to remain the residual gas refrigerant. Since it is adsorbed by the adsorbent filled in the gas recovery container and recovered, leakage of the recovered gas refrigerant into the atmosphere is eliminated, and only the gas recovery container and the liquid recovery container are replaced. There is no.

Further, a connector connected to the power source terminal of the compressor of the domestic refrigerator via a compressor drive circuit and an electric cord is connected, and a connecting part is connected to the high-pressure side pipe of the compressor of the domestic refrigerator to compress. The compressor is operated by turning on / off the switch provided in the machine drive circuit, and the refrigerant is liquefied by the condenser provided in the connecting part through the lead-in pipe to be cooled and liquefied and collected in the liquid recovery container, and the compressor is stopped. The on-off valve provided in the middle of the intake pipe is closed, the flow path switching valve is switched, and the residual gas refrigerant is adsorbed by the adsorbent filled in the gas recovery container and recovered, so it is necessary to provide a compressor. Absent.

[0029]

Embodiments of the present invention will be described below with reference to the drawings. The same components as those of the conventional example are designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 1 is a piping system diagram of a refrigerator-compatible refrigerant recovery machine according to a first embodiment of the present invention. 1 is a compressor for sucking the refrigerant to be recovered, and 9a is a suction pipe provided on the low pressure side of the compressor 1. , 8a are connecting parts connected to the suction pipe 9a, and 16 is a suction pipe 9
An on-off valve provided in the middle of a, 5a is a discharge pipe provided on the discharge side of the compressor 1, 2 is a condenser provided via the discharge pipe 5a, 5b is piping provided on the outlet side of the condenser 2, 4a Is a liquid recovery container provided via the pipe 5b, 17 is a flow path switching valve provided in the middle of the pipe 5b, 18 is a branch pipe connected to the flow path switching valve 17, and 19 is provided via the branch pipe 18. Gas recovery container, 20 is a gas recovery container
It is an adsorbent filled in 19.

The operation of the first embodiment having the above construction will be described below.

First, the connecting part 8a is connected to the refrigeration cycle pipe of the refrigerator. Next, the compressor 1 is operated to suck the refrigerant through the suction pipe 9a and discharge it into the discharge pipe 5a. The discharged refrigerant is cooled and liquefied in the condenser 2 through the discharge pipe 5a, and is recovered in the liquid recovery container 4a through the pipe 5b.
Then, the compressor 1 is stopped, the on-off valve 16 provided in the suction pipe 9a is closed, and the flow path switching valve 17 provided in the pipe 5b is switched to communicate with the branch pipe 18 connected to the gas recovery container 19. As a result, the high-pressure gas refrigerant remaining in the discharge pipe 5a, the condenser 2 and the pipe 5b is introduced into the gas recovery container 19 through the branch pipe 18, and the adsorbent 20 filled in the gas recovery container 19 is introduced. Adsorb and collect. Further, the liquid recovery container 4a and the gas recovery container 19 are replaced according to the type of refrigerant to be recovered.

As described above, in the refrigerator-compatible refrigerant recovery machine of the first embodiment, leakage of the recovered gaseous refrigerant into the atmosphere can be eliminated, and different refrigerants can be replaced by simply replacing the gas recovery container 19 and the liquid recovery container 4a. Mixing can be prevented.

Next, a second embodiment of the refrigerant recovery machine for a refrigerator according to the present invention will be described with reference to the drawings.

FIG. 2 is a piping system diagram of a refrigerator-compatible refrigerant recovery machine according to a second embodiment of the present invention. The same components as those in the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted.

In FIG. 2, 1 is a compressor for sucking the refrigerant to be recovered, 9a is a suction pipe provided on the low pressure side of the compressor 1, and 8a is shown.
Is a connecting part connected to the suction pipe 9a, 16 is an opening / closing valve provided in the middle of the suction pipe 9a, 5a is a discharge pipe provided on the discharge side of the compressor 1, 2 is a condenser provided via the discharge pipe 5a, 5b is a pipe provided on the outlet side of the condenser 2, 4a is a liquid recovery container provided via the pipe 5b, 17 is a flow passage switching valve provided in the middle of the pipe 5b, and 18 is connected to the flow passage switching valve 17. Branch pipe, 19 is branch pipe
A gas recovery container provided via 18, 20 is an adsorbent filled in the gas recovery container 19, 21 is a pressure detection means provided in the suction pipe 9a, and 22 is a flow sensor based on a signal from the pressure detection means 21. The flow path switching valve control means switches the path switching valve 17 to the branch pipe 18.

The operation of the second embodiment having the above construction will be described below.

First, the connecting part 8a is connected to the refrigeration cycle pipe of the refrigerator. Next, the compressor 1 is operated to suck the refrigerant through the suction pipe 9a and discharge it into the discharge pipe 5a. The discharged refrigerant is cooled and liquefied in the condenser 2 through the discharge pipe 5a, and is recovered in the liquid recovery container 4a through the pipe 5b.
At this time, the pressure detection means 21 detects the pressure in the suction pipe 9a, and when the pressure reaches a pressure at which the refrigerant recovery is completed, it sends a signal to the flow path switching valve control means 22 to cause the flow path switching valve control means 22 to flow. The path switching valve 17 is switched to the branch pipe 18. Next, the compressor 1 is stopped and the on-off valve 16 provided in the suction pipe 9a is closed. As a result, the high-pressure gas refrigerant remaining in the discharge pipe 5a, the condenser 2 and the pipe 5b is introduced into the gas recovery container 19 through the branch pipe 18, and the adsorbent 20 filled in the gas recovery container 19 is introduced. Are adsorbed on and collected. In addition, the liquid recovery container 4a and the gas recovery container 19 corresponding to the type of refrigerant to be recovered.
To replace.

As described above, in the refrigerator-compatible refrigerant recovery machine of the second embodiment, leakage of the recovered gaseous refrigerant into the atmosphere can be eliminated, and different refrigerants can be replaced by simply replacing the gas recovery container 19 and the liquid recovery container 4a. Mixing can be prevented. Further, it is possible to prevent waste of work time and inflow of the liquid refrigerant into the gas recovery container 19 due to excess or deficiency of switching time of the flow path switching valve 17.

FIG. 3 is a piping system diagram of a refrigerator-compatible refrigerant recovery machine according to a third embodiment of the present invention. The same components as those in the first and second embodiments are designated by the same reference numerals and detailed description thereof will be omitted.

In FIG. 3, 1 is a compressor for sucking the refrigerant to be collected, 9a is a suction pipe provided on the low pressure side of the compressor 1, and 8a is shown.
Is a connecting part connected to the suction pipe 9a, 16 is an opening / closing valve provided in the middle of the suction pipe 9a, 5a is a discharge pipe provided on the discharge side of the compressor 1, 2 is a condenser provided via the discharge pipe 5a, 5b is a pipe provided on the outlet side of the condenser 2, 4a is a liquid recovery container provided via the pipe 5b, 17 is a flow passage switching valve provided in the middle of the pipe 5b, and 18 is connected to the flow passage switching valve 17. Branch pipe, 19 is branch pipe
A gas recovery container provided via 18, 20 is an adsorbent filled in the gas recovery container 19, 21 is a pressure detection means provided in the suction pipe 9a, and 22 is a flow sensor based on a signal from the pressure detection means 21. Flow path switching valve control means for switching the path switching valve 17 to the branch pipe 18, 23
Is a compressor control means for stopping the compressor 1 based on a signal from the pressure detection means 21.

The operation of the third embodiment having the above construction will be described below.

First, the connecting part 8a is connected to the refrigeration cycle pipe of the refrigerator. Next, the compressor 1 is operated to suck the refrigerant through the suction pipe 9a and discharge it into the discharge pipe 5a. The discharged refrigerant is cooled and liquefied in the condenser 2 through the discharge pipe 5a, and is recovered in the liquid recovery container 4a through the pipe 5b.
At this time, the pressure detecting means 21 detects the pressure in the suction pipe 9a, and when the pressure falls to the pressure at which the refrigerant recovery ends, a signal is sent to the flow path switching valve control means 22 and the compressor control means 23,
The flow path switching valve control means 22 switches the flow path switching valve 17 to the branch pipe 18, and the compressor control means 23 stops the compressor 1. Next, the on-off valve 16 provided in the suction pipe 9a is closed. As a result, the high-pressure gas refrigerant remaining in the discharge pipe 5a, the condenser 2 and the pipe 5b passes through the branch pipe 18 and the gas recovery container 19
The gas is introduced into the gas recovery container 19, and is adsorbed and recovered by the adsorbent 20 filled in the gas recovery container 19. Further, the liquid recovery container 4a and the gas recovery container 19 are replaced according to the type of refrigerant to be recovered.

As described above, in the refrigerator-compatible refrigerant recovery machine of the third embodiment, leakage of the recovered gaseous refrigerant into the atmosphere can be eliminated, and different refrigerants can be replaced by simply replacing the gas recovery container 19 and the liquid recovery container 4a. Mixing can be prevented. Further, it is possible to prevent waste of work time and inflow of the liquid refrigerant into the gas recovery container 19 due to excess or deficiency of switching time of the flow path switching valve 17. Further, it is possible to eliminate waste of work time and residual unrecovered refrigerant due to excess or deficiency of compressor operating time.

FIG. 4 is a piping system diagram of a refrigerator-compatible refrigerant recovery machine according to a fourth embodiment of the present invention. In addition, the first, second,
The same components as those in the third embodiment are designated by the same reference numerals and detailed description thereof will be omitted.

In FIG. 4, 1 is a compressor for sucking the refrigerant to be collected, 9a is a suction pipe provided on the low pressure side of the compressor 1, and 8a is shown.
Is a connecting part connected to the suction pipe 9a, 16 is an opening / closing valve provided in the middle of the suction pipe 9a, 5a is a discharge pipe provided on the discharge side of the compressor 1, 2 is a condenser provided via the discharge pipe 5a, 5b is a pipe provided on the outlet side of the condenser 2, 4a is a liquid recovery container provided via the pipe 5b, 17 is a flow passage switching valve provided in the middle of the pipe 5b, and 18 is connected to the flow passage switching valve 17. Branch pipe, 19 is branch pipe
A gas recovery container provided via 18, 20 is an adsorbent filled in the gas recovery container 19, 21 is a pressure detection means provided in the suction pipe 9a, and 22 is a flow sensor based on a signal from the pressure detection means 21. Flow path switching valve control means for switching the path switching valve 17 to the branch pipe 18, 23
Is a compressor control means for stopping the compressor 1 based on the signal of the pressure detection means 21, and 24 is an opening / closing valve control means for closing the opening / closing valve 16 based on the signal of the pressure detection means 21.

The operation of the fourth embodiment having the above construction will be described below.

First, the connecting part 8a is connected to the refrigerating cycle pipe of the refrigerator. Next, the compressor 1 is operated to suck the refrigerant through the suction pipe 9a and discharge it into the discharge pipe 5a. The discharged refrigerant is cooled and liquefied in the condenser 2 through the discharge pipe 5a, and is recovered in the liquid recovery container 4a through the pipe 5b.
At this time, the pressure detection means 21 detects the pressure in the suction pipe 9a, and when the pressure falls to the pressure at which the refrigerant recovery is completed, a signal is sent to the flow path switching valve control means 22, the compressor control means 23, and the opening / closing valve control means 24. The flow path switching valve control means 22 switches the flow path switching valve 17 to the branch pipe 18, the compressor control means 23 stops the compressor 1, and the opening / closing valve control means 24 almost simultaneously with the stop of the compressor 1. The on-off valve 16 is closed. As a result, the discharge pipe 5a
The high-pressure gas refrigerant remaining in the inside, the condenser 2 and the pipe 5b is introduced into the gas recovery container 19 through the branch pipe 18 and is adsorbed by the adsorbent 20 filled in the gas recovery container 19. Be recovered. Further, the liquid recovery container 4a and the gas recovery container 19 are replaced according to the type of refrigerant to be recovered.

As described above, in the refrigerator-compatible refrigerant recovery machine of the fourth embodiment, leakage of the recovered gaseous refrigerant into the atmosphere can be eliminated, and different refrigerants can be replaced by simply replacing the gas recovery container 19 and the liquid recovery container 4a. Mixing can be prevented. Further, it is possible to prevent waste of work time and inflow of the liquid refrigerant into the gas recovery container 19 due to excess or deficiency of switching time of the flow path switching valve 17. Further, it is possible to eliminate waste of work time and residual unrecovered refrigerant due to excess or deficiency of compressor operating time.
Further, it is possible to prevent the overload operation of the compressor due to the time difference between the stop of the compressor and the closing operation of the on-off valve and the reverse flow of the recovered refrigerant due to the pressure difference.

FIG. 5 is a piping system diagram of a refrigerator-compatible refrigerant recovery machine according to a fifth embodiment of the present invention. The same components as those in the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted.

In FIG. 5, 1 is a compressor for sucking the refrigerant to be collected, 9a is a suction pipe provided on the low pressure side of the compressor 1, and 8a is shown.
Is a connecting part connected to the suction pipe 9a, 16 is an opening / closing valve provided in the middle of the suction pipe 9a, 5a is a discharge pipe provided on the discharge side of the compressor 1, 2 is a condenser provided via the discharge pipe 5a, 5b is a pipe provided on the outlet side of the condenser 2, 4a is a liquid recovery container provided via the pipe 5b, 17 is a flow passage switching valve provided in the middle of the pipe 5b, and 18 is connected to the flow passage switching valve 17. Branch pipe, 19 is branch pipe
A gas recovery container provided via 18, 20 is an adsorbent filled in the gas recovery container 19, 25 is a timer circuit that operates in synchronization with the start of the compressor 1, and 26 is the timer after a predetermined fixed time. It is a functional component control means for controlling the flow path switching valve 17, the compressor 1, and the on-off valve 16 based on the signal of the circuit 25.

The operation of the fifth embodiment having the above construction will be described below.

First, the connecting part 8a is connected to the refrigerating cycle pipe of the refrigerator. Next, the compressor 1 is operated to suck the refrigerant through the suction pipe 9a and discharge it into the discharge pipe 5a. The discharged refrigerant is cooled and liquefied in the condenser 2 through the discharge pipe 5a, and is recovered in the liquid recovery container 4a through the pipe 5b.
At this time, the timer circuit 25 is operating in synchronization with the start of the compressor 1, and after a certain period of time when the refrigerant recovery is completed, a signal is sent to the functional component control means 26, and the functional component control means 26 switches the flow path. The valve 17 is switched to the branch pipe 18, the compressor 1 is stopped, and the opening / closing valve 16 is closed almost simultaneously with the stop of the compressor 1.
As a result, the inside of the discharge pipe 5a, the inside of the condenser 2 and the pipe 5b
The high-pressure gas refrigerant remaining therein is introduced into the gas recovery container 19 via the branch pipe 18, adsorbed by the adsorbent 20 filled in the gas recovery container 19 and recovered. In addition, the liquid recovery container 4a and the gas recovery container 1 corresponding to the type of refrigerant to be recovered.
Replace 9

As described above, in the refrigerator-compatible refrigerant recovery machine of the fifth embodiment, leakage of the recovered gaseous refrigerant into the atmosphere can be eliminated, and different refrigerants can be replaced by simply replacing the gas recovery container 19 and the liquid recovery container 4a. Mixing can be prevented. Further, it is possible to prevent waste of work time and inflow of the liquid refrigerant into the gas recovery container 19 due to excess or deficiency of switching time of the flow path switching valve 17. Further, it is possible to eliminate waste of work time and residual unrecovered refrigerant due to excess or deficiency of compressor operating time.
Further, it is possible to prevent the overload operation of the compressor due to the time difference between the stop of the compressor and the closing operation of the on-off valve and the reverse flow of the recovered refrigerant due to the pressure difference. Further, the manufacturing cost can be suppressed without requiring a pressure detecting means or the like.

FIG. 6 is a piping system diagram of a refrigerator-compatible refrigerant recovery machine according to a sixth embodiment of the present invention. The same components as those in the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted.

In FIG. 6, 27 is a connector connected to the power supply terminal of the compressor 41 of the household refrigerator 40, 28 is an electric cord connected to the connector 27, 29 is a compressor drive circuit to which the electric cord 28 is connected, 30 Is an on / off switch for stopping the operation of the compressor 41 of the household refrigerator 40 provided in the compressor drive circuit 29, 8b is a connecting part for connecting to the high pressure side pipe of the compressor 41 of the household refrigerator 40, 9b Is a lead-in pipe connected to the connecting part 8b, 2 is a condenser provided via the lead-in pipe 9b, 16a is an opening / closing valve provided in the middle of the lead-in pipe 9b, 5b is pipe 4a provided at the outlet side of the condenser 2 Is a liquid recovery container provided via the pipe 5b, 17 is a flow path switching valve provided in the middle of the pipe 5b, 18 is a branch pipe connected to the flow path switching valve 17, and 19 is provided via the branch pipe 18. A gas recovery container, 20 is an adsorbent filled in the gas recovery container 19.

The operation of the sixth embodiment having the above construction will be described below.

First, the connecting part 8b is connected to the refrigeration cycle pipe of the household refrigerator 40, and the connector 27 connected to the electric cord 28 is connected to the power supply terminal of the compressor 41 of the household refrigerator 40. Next, the on / off switch 30 provided in the compressor drive circuit 29 is turned on to operate the compressor 41, and the refrigerant is guided to the condenser 2 through the lead-in pipe 9b, liquefied and cooled in the condenser 2, and the pipe 5b is connected. It collects in the liquid collection container 4a via. After that, the compressor 41 of the household refrigerator 40 is stopped, the opening / closing valve 16a provided in the intake pipe 9b is closed, and the flow path switching valve 17 provided in the pipe 5b is connected to the branch pipe 18 connected to the gas recovery container 19. Switch to open communication. As a result, the high-pressure gas refrigerant remaining in the intake pipe 9b, the condenser 2 and the pipe 5b is introduced into the gas recovery container 19 through the branch pipe 18, and the adsorbent 20 filled in the gas recovery container 19 is introduced. And then collect it. Further, the liquid recovery container 4a and the gas recovery container 19 are replaced according to the type of refrigerant to be recovered.

As described above, in the refrigerator-use refrigerant recovery machine of the sixth embodiment, leakage of the recovered gas refrigerant into the atmosphere can be eliminated, and different refrigerants can be replaced by simply replacing the gas recovery container 19 and the liquid recovery container 4a. Mixing can be prevented. Further, since the compressor 41 of the household refrigerator 40 is used, it is not necessary to provide a compressor on the recovery machine side, and the size and weight can be reduced.

FIG. 7 is a piping system diagram of a refrigerator-compatible refrigerant recovery machine according to a seventh embodiment of the present invention. The same components as those in the sixth embodiment are designated by the same reference numerals and detailed description thereof will be omitted.

In FIG. 7, 27 is a connector connected to the power supply terminal of the compressor 41 of the household refrigerator 40, 28 is an electric cord connected to the connector 27, 29 is a compressor drive circuit to which the electric cord 28 is connected, 30 Is an on / off switch for stopping the operation of the compressor 41 of the household refrigerator 40 provided in the compressor drive circuit 29, 8b is a connecting part for connecting to the high pressure side pipe of the compressor 41 of the household refrigerator 40, 9b Is a lead-in pipe connected to the connecting part 8b, 2 is a condenser provided via the lead-in pipe 9b, 16a is an opening / closing valve provided in the middle of the lead-in pipe 9b, 5b is pipe 4a provided at the outlet side of the condenser 2 Is a liquid recovery container provided via the pipe 5b, 17 is a flow path switching valve provided in the middle of the pipe 5b, 18 is a branch pipe connected to the flow path switching valve 17, and 19 is provided via the branch pipe 18. Gas recovery container, 20 is the adsorbent filled in the gas recovery container 19, 31 is synchronized with the on / off switch 30 ON / OFF operation Timer circuits operating Te, 32 based on the signal of the timer circuit 31 after a predetermined time predetermined, there, the channel switching valve 17 and Nyusetsu switch 30
And a functional component control means for controlling the on-off valve 16a.

The operation of the seventh embodiment having the above construction will be described below.

First, the connecting part 8b is connected to the refrigeration cycle pipe of the household refrigerator 40, and the connector 27 connected to the electric cord 28 is connected to the power supply terminal of the compressor 41 of the household refrigerator 40. Next, the on / off switch 30 provided in the compressor drive circuit 29 is turned on to operate the compressor 41, and the refrigerant is guided to the condenser 2 through the lead-in pipe 9b, liquefied and cooled in the condenser 2, and the pipe 5b is connected. It collects in the liquid collection container 4a via. At this time, the timer circuit 31 is operating in synchronization with the start of the compressor 41 of the household refrigerator 40, and sends a signal to the functional component control means 32 after a certain period of time when the refrigerant recovery is completed, and the functional component control means 32 is The flow path switching valve 17 is switched to the branch pipe 18, the compressor 41 of the domestic refrigerator 40 is stopped, and the opening / closing valve 16a is closed almost at the same time when the compressor 41 of the domestic refrigerator 40 is stopped. As a result, the lead-in pipe 9b
The high-pressure gas refrigerant remaining inside, inside the condenser 2 and inside the pipe 5b is introduced into the gas recovery container 19 through the branch pipe 18,
The gas is collected by being adsorbed by the adsorbent 20 filled in the gas recovery container 19. Further, the liquid recovery container 4a and the gas recovery container 19 are replaced according to the type of refrigerant to be recovered.

As described above, in the refrigerator-compatible refrigerant recovery machine of the seventh embodiment, leakage of the recovered gaseous refrigerant into the atmosphere can be eliminated, and different refrigerants can be replaced by simply replacing the gas recovery container 19 and the liquid recovery container 4a. Mixing can be prevented. Further, since the compressor 41 of the household refrigerator 40 is used, it is not necessary to provide a compressor on the recovery machine side, and the size and weight can be reduced. Furthermore, operation mistakes can be prevented and work time can be made efficient.

Next, a first embodiment of a refrigerant recovery method for a refrigerator-compatible refrigerant recovery machine according to the present invention will be described with reference to the configuration of FIG. 1 and the flowchart of FIG.

First, the connecting part 8a provided on the suction side of the compressor 1 via the on-off valve 16 is connected to the refrigeration cycle pipe (not shown) of the domestic refrigerator (S8-1). Next, the compressor 1 is operated (S8-2). Next, the refrigerant is cooled and liquefied by the condenser 2 provided in the discharge pipe 5a of the compressor 1 and recovered in the liquid recovery container 4a.
(S8-3). Next, the compressor 1 is stopped and the on-off valve 16 is closed (S8-4). Finally, the flow path switching valve 17 is switched to collect the residual gas refrigerant by adsorbing it to the adsorbent 20 filled in the gas recovery container 19 (S8-5).

As described above, in the first embodiment of the refrigerant recovery method for the refrigerator-compatible refrigerant recovery machine, leakage of the recovered gas refrigerant into the atmosphere can be eliminated, and the gas recovery container and the liquid recovery container can be simply replaced. Mixing of different refrigerants can be prevented.

Next, a second embodiment of the refrigerant recovery method for the refrigerator-compatible refrigerant recovery machine according to the present invention will be described with reference to the configuration of FIG. 6 and the flowchart of FIG.

First, the connector 27 connected to the power source terminal of the compressor 41 of the household refrigerator 40 is connected to the compressor drive circuit via the electric cord (S9-1). Next, the connecting member 8b is connected to the high pressure side pipe of the compressor 41 of the household refrigerator 40 (S9-2).
Next, the on / off switch 30 provided in the compressor drive circuit is turned on to operate the compressor 41 (S9-3). Next, the refrigerant is cooled and liquefied by the condenser 2 provided in the connecting component 8b via the lead-in pipe 9b and is recovered in the liquid recovery container 4a (S9-4). Next, the compressor 41 is stopped and the on-off valve 16a provided in the middle of the intake pipe 9b is closed.
(S9-5). Finally, the flow path switching valve 17 is switched to collect the remaining gas refrigerant by adsorbing the residual gas refrigerant on the adsorbent 20 filled in the gas recovery container 19 (S9-6).

As described above, in the second embodiment of the refrigerant recovery method for the refrigerator-based refrigerant recovery machine, the leakage of the recovered gas refrigerant into the atmosphere can be eliminated, and the gas recovery container and the liquid recovery container can be simply replaced. Mixing of different refrigerants can be prevented.
Furthermore, it is not necessary to provide a compressor, and the size and weight can be reduced.

[0071]

As described above, according to the refrigerator-use refrigerant recovery machine of the present invention, the following effects can be obtained.

According to the structure of claim 1, the compressor for sucking the refrigerant to be recovered, the suction pipe provided on the low pressure side of the compressor, the connecting component connected to the suction pipe, and the suction pipe An on-off valve provided on the way, a discharge pipe provided on the discharge side of the compressor, a condenser provided via this discharge pipe, a pipe provided on the outlet side of this condenser, and this pipe A liquid recovery container provided, a flow path switching valve provided in the middle of the pipe, a branch pipe connected to the flow path switching valve, a gas recovery container provided through the branch pipe, and the inside of the gas recovery container Since the refrigerant recovery device for the refrigerator is composed of the adhesive filled in, the leakage of the recovered gaseous refrigerant into the atmosphere can be eliminated,
Since only the gas recovery container and the liquid recovery container are replaced, mixing of different refrigerants can be prevented.

According to the second aspect of the present invention, the pressure detecting means provided in the suction pipe and the flow passage switching valve for switching the flow passage switching valve to the branch pipe based on a signal from the pressure detecting means. By including the control means, it is possible to prevent waste of work time due to excess or deficiency of switching time of the flow path switching valve and inflow of liquid refrigerant into the gas recovery container.

According to the third aspect of the present invention, the compressor control means for stopping the compressor based on the signal from the pressure detection means is provided, so that the working time is wasted due to the excess or deficiency of the compressor operating time. Further, it is possible to eliminate the residual uncollected refrigerant.

According to the structure described in claim 4, by providing the opening / closing valve control means for closing the opening / closing valve based on the signal of the pressure detecting means, the time difference between the stop of the compressor and the closing operation of the opening / closing valve is caused. Backflow of the recovered refrigerant due to overload operation of the compressor and pressure difference can be eliminated.

According to the fifth aspect of the present invention, the timer circuit that operates in synchronization with the start of the compressor, and the flow path switching valve and the compressor based on the signal from the timer circuit after the elapse of a predetermined time. By including a functional component control means for controlling the opening and closing valve, without the need for pressure detection means,
It is possible to suppress an increase in manufacturing cost.

According to the structure of claim 6, a connector connected to the power supply terminal of the compressor of the refrigerator, an electric cord connected to the connector, a compressor drive circuit connecting the electric cord, and the compressor. An on / off switch for stopping the operation of the compressor provided in the machine drive circuit, a connecting part for connecting to the high-pressure side pipe of the compressor of the refrigerator, a lead-in pipe connected to this connecting part, and this lead-in pipe. A condenser provided through the pipe, an opening / closing valve provided in the middle of the intake pipe, a pipe provided at the outlet side of the condenser, a liquid recovery container provided through the pipe, and a pipe provided in the middle of the pipe. Refrigerant compatible refrigerant recovery from the flow path switching valve, the branch pipe connected to the flow path switching valve, the gas recovery container provided via the branch tube, and the adsorbent filled in the gas recovery container As the machine is configured, Of can eliminate leakage into the atmosphere, only to replace the gas recovery container and a liquid collection container, it is possible to eliminate the contamination of different refrigerants. Moreover, since the compressor on the refrigerator side is used, there is no need to install a compressor on the collector side, and the size and weight can be reduced.

According to the structure of claim 7, a timer circuit which operates in synchronization with the on / off operation of the on / off switch, and the flow path switching valve and the on / off switch based on a signal of the timer circuit after a predetermined time. By providing the switch and the functional component control means for controlling the opening / closing valve, an operation error can be prevented,
Work time can be improved.

According to the refrigerant recovery method of the refrigerator-compatible refrigerant recovery machine of the present invention, the following effects can be obtained.

According to the method of claim 8, the connecting part provided on the suction side of the compressor via the on-off valve is connected to the refrigeration cycle pipe of the refrigerator, the compressor is operated, and the discharge side of the compressor is connected. Refrigerant is liquefied by the provided condenser and collected in the liquid recovery container, the compressor is stopped and the on-off valve is closed, the flow path switching valve is switched, and the residual gas refrigerant is filled in the gas recovery container. Since the adsorbent adsorbs and collects the collected gas refrigerant, leakage of the collected gas refrigerant into the atmosphere can be eliminated, and mixing of different refrigerants can be prevented only by replacing the gas recovery container and the liquid recovery container.

According to the method of claim 9, a connector connected to a power source terminal of a compressor of a refrigerator via a compressor drive circuit and an electric cord is connected to a high pressure side pipe of the compressor of the refrigerator. To turn on and off the on / off switch provided in the compressor drive circuit to operate the compressor, and to cool and liquefy the refrigerant with the condenser provided through the lead-in pipe in the connecting part to collect it in the liquid recovery container. Then, the compressor is stopped and the on-off valve provided in the middle of the intake pipe is closed, the flow path switching valve is switched, and the residual gas refrigerant is adsorbed by the adsorbent filled in the gas recovery container and recovered. Therefore, it is not necessary to provide a compressor on the recovery machine side, and the size and weight can be reduced.

[Brief description of drawings]

FIG. 1 is a piping system diagram of a first embodiment of a refrigerant recovery machine for a refrigerator according to the present invention.

FIG. 2 is a piping system diagram of a second embodiment of the refrigerator-compatible refrigerant recovery machine according to the present invention.

FIG. 3 is a piping system diagram of a third embodiment of a refrigerant recovery machine for a refrigerator according to the present invention.

FIG. 4 is a piping system diagram of a fourth embodiment of a refrigerant recovery machine for a refrigerator according to the present invention.

FIG. 5 is a piping system diagram of a fifth embodiment of the refrigerator-compatible refrigerant recovery machine according to the present invention.

FIG. 6 is a piping system diagram of a sixth embodiment of the refrigerator-compatible refrigerant recovery machine according to the present invention.

FIG. 7 is a piping system diagram of a seventh embodiment of a refrigerant recovery machine for a refrigerator according to the present invention.

FIG. 8 is a flowchart relating to the refrigerant recovery of the first embodiment of the refrigerant recovery method of the refrigerator-compatible refrigerant recovery device according to the present invention.

FIG. 9 is a flowchart relating to the refrigerant recovery of the second embodiment of the refrigerant recovery method of the refrigerator-compatible refrigerant recovery device according to the present invention.

FIG. 10 is a piping system diagram of a conventional refrigerant recovery machine.

[Explanation of symbols]

1 ... Compressor, 2 ... Condenser, 4a ... Liquid recovery container,
5a ... Discharge pipe, 5b ... Piping, 8a, 8b ... Connection parts,
9a, 9b ... Intake pipe, 16, 16a ... Open / close valve, 17 ... Flow path switching valve, 18 ... Branch pipe, 19 ... Gas recovery container, 20 ... Adhesive agent, 21 ... Pressure detecting means, 22 ... Flow path switching valve control means,
23 ... Compressor control means, 24 ... Open / close valve control means, 25,
31 ... Timer circuit, 26, 32 ... Functional component control means, 27 ...
Connector, 28 ... electric cord, 29 ... compressor drive circuit,
30… ON / OFF switch, 40… Household refrigerator, 41… Household refrigerator compressor.

Claims (9)

[Claims] 1. A compressor for sucking refrigerant to be recovered, a suction pipe provided on a low pressure side of the compressor, a connecting part connected to the suction pipe, and an on-off valve provided in the middle of the suction pipe. A discharge pipe provided on the discharge side of the compressor, a condenser provided through the discharge pipe, a pipe provided at the outlet side of the condenser, a liquid recovery container provided through the pipe, and From the flow path switching valve provided in the middle of the pipe, the branch pipe connected to this flow path switching valve, the gas recovery container provided via this branch pipe, and the adsorbent filled in the gas recovery container Refrigerant recovery machine compatible with refrigerators. 2. A pressure detecting means provided in the suction pipe, and a flow path switching valve control means for switching the flow path switching valve to the branch pipe based on a signal from the pressure detecting means. The refrigerating machine for a refrigerator according to claim 1. 3. The refrigerator-compatible refrigerant recovery machine according to claim 1, further comprising compressor control means for stopping the compressor based on a signal from the pressure detection means. 4. The refrigerator-compatible refrigerant recovery machine according to claim 1, further comprising an opening / closing valve control means for closing the opening / closing valve based on a signal from the pressure detecting means. 5. A timer circuit that operates in synchronization with the start of the compressor, and a functional component that controls the flow path switching valve, the compressor, and the on-off valve based on a signal from the timer circuit after a predetermined time has elapsed. The refrigerating machine for a refrigerator according to claim 1, further comprising a control means. 6. A connector connected to a power supply terminal of a compressor of a refrigerator, an electric cord connected to the connector, a compressor drive circuit connected to the electric cord, and a compressor provided in the compressor drive circuit. An on / off switch for stopping the operation, a connecting part for connecting to the high-pressure side pipe of the compressor of the refrigerator, a lead-in pipe connected to this connecting part, and a condenser provided through this lead-in pipe, An on-off valve provided in the middle of the intake pipe, a pipe provided at the outlet side of the condenser, a liquid recovery container provided through this pipe, and a flow path switching valve provided in the middle of the pipe, A refrigerator-compatible refrigerant recovery machine comprising a branch pipe connected to a flow path switching valve, a gas recovery container provided via the branch pipe, and an adsorbent filled in the gas recovery container. 7. A timer circuit that operates in synchronism with the on / off switch operation, and controls the flow path switching valve, the on / off switch, and the on-off valve based on a signal from the timer circuit after a lapse of a predetermined time. 7. The refrigerator-compatible refrigerant recovery machine according to claim 6, further comprising: 8. A refrigerant is provided in a condenser provided on the discharge side of the compressor by connecting a connecting part provided on the suction side of the compressor via an on-off valve to a refrigeration cycle pipe of a refrigerator to operate the compressor. Is liquefied and recovered in a liquid recovery container, the compressor is stopped and the on-off valve is closed, and the flow path switching valve is switched to adsorb the residual gas refrigerant to the adsorbent filled in the gas recovery container. A refrigerant recovery method for a refrigerator-compatible refrigerant recovery device, characterized in that the recovery operation is performed by allowing the refrigerant to recover. 9. A power supply terminal of a compressor of a refrigerator is connected to a connector connected to a compressor drive circuit via an electric cord, and a connecting part is connected to a high pressure side pipe of the compressor of the refrigerator,
The compressor is operated by turning on / off the switch provided in the compressor drive circuit, and the refrigerant is cooled and liquefied by a condenser provided through the lead-in pipe in the connecting part to be recovered in a liquid recovery container. The compressor is stopped and the on-off valve provided in the middle of the intake pipe is closed, and the flow path switching valve is switched to collect the residual gas refrigerant by adsorbing it to the adsorbent filled in the gas recovery container. A refrigerant recovery method for a refrigerator-compatible refrigerant recovery device.