JPH06323698A - Refrigerant gas collector - Google Patents

Abstract

PURPOSE:To provide a refrigerant gas collector which can collect refrigerant gas efficiently from inside of instruments without letting the refrigerant gas to go out. CONSTITUTION:A refrigerant gas collector is constituted by connecting through pipes in series from a refrigerant gas inlet 1, a refrigerant gas introduction part including a gas inlet pipe 3, a valve 4 and an air purge button 2, a filter 5, a compressor 6 for suction and compression, a solenoid valve 7, a condesner 9 and a collecting container 13 which collects condensed liquid refrigerant gas through a collecting pipe 11 and a container valve 12. In the refrigerant gas collector, between the condenser 9 and the collecting container 13, a reproduction return pipe 14 connected to an inlet side of the filter 5 is branched and piped through a solenoid valve 15. A liquid refrigerant inlet pipe 18 is branched between the condenser 9 and the solenoid valve 15, and connected to the collecting container 13. A three-way valve 19 is interposed at this piping part and a part of the collecting pipe connected to the reproduction return pipe 14 is used as a return pipe 20. The pipes 20 and 14 are used exclusively as gasified refrigerant gas passages and another pipe 18 is used exclusively as a liquid refrigerant passage. Thus, piping is made to form a complex circuit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerant gas recovery device for recovering a refrigerant gas from the inside of a device such as a used cooler or an air conditioner using the refrigerant gas without releasing it into the atmosphere. It is about.

[0002]

2. Description of the Related Art A conventional refrigerant gas recovery apparatus introduces a refrigerant gas flowing from an inlet into an inlet valve from an inflow pipe equipped with an air purge button, and a separation unit for removing impurities from the introduced refrigerant gas. Unit, a compression unit for sucking and compressing the refrigerant gas, a condensing unit for condensing the refrigerant gas introduced through the opening / closing valve, and the condensed liquid refrigerant gas is recovered into a recovery container via a recovery pipe and a container valve. And a recovery container unit to be connected in series, and between the condensation unit and the recovery container unit, a regeneration return pipe connected to the inflow side of the separation unit is branched through a switching valve. It was a composition.

[0003]

In the recovery operation using the refrigerant gas recovery device configured as described above, when the recovery of the refrigerant gas into the recovery container progresses and a certain amount of the refrigerant gas flows in, the recovery container Since the internal pressure and temperature are both high and dangerous, it is necessary to suspend the recovery work and return the vaporized refrigerant gas in the recovery container to the low pressure side of the compression unit through the recovery pipe and the return pipe for regeneration.

In this case, since the liquefied refrigerant gas is filled in the recovery pipe, the liquefied refrigerant gas is sucked into the compression unit through the regeneration return pipe without being recovered, and the pressure and temperature in the recovery container are adjusted. Must be lowered.

For this reason, the recovery work is interrupted for a long time due to the pressure drop and the temperature drop in the recovery container, the recovery efficiency of the refrigerant gas is extremely low, and the recovery work requires a long time. There was a task to be done.

An object of the present invention is to provide a refrigerant gas recovery device which can efficiently recover a refrigerant gas from the inside of a device or the like using the refrigerant gas without releasing it into the atmosphere.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and introduces a refrigerant gas flowing from an inlet into an inlet valve from an inlet pipe equipped with an air purge button. An introduction unit, a separation unit for removing impurities from the introduced refrigerant gas, a compression unit for sucking and compressing the refrigerant gas, a condensing unit for condensing the refrigerant gas introduced through the opening / closing valve, and a condensed liquid refrigerant gas Is connected in series to a recovery container unit for recovering the recovery container and a recovery container via a container valve, and is connected between the condensation unit and the recovery container unit to the inflow side of the separation unit. In a refrigerant gas recovery device in which a regeneration return pipe is branched through a switching valve, an opening / closing valve is provided between the compression unit and the condensation unit. The exhaust port released via the branch pipe, and the liquid refrigerant gas inflow pipe is branched between the condensing unit and the switching valve, and the liquid refrigerant gas inflow pipe is piped to the recovery pipe. With a three-way switching valve interposed between the recovery pipe and the recovery pipe, a part of the recovery pipe is used as a return pipe, and the return pipe and the regeneration return pipe are used as vaporized refrigerant gas return dedicated passages, and liquid refrigerant gas is used. A gist of a refrigerant gas recovery device is characterized in that an inflow pipe is arranged in a multiple circuit configuration in which a passage for exclusive use of a liquid refrigerant gas is provided.

[0008]

In the refrigerant gas recovery device configured as described above, the liquid refrigerant gas inflow pipe is branched between the condensing unit and the switching valve, and the liquid refrigerant gas inflow pipe is piped to the recovery pipe, and the pipe portion is three-wayed. With a switching valve interposed, a part of the recovery pipe continuous with the regeneration return pipe is used as a return pipe, and the return pipe and the regeneration return pipe are used as vaporized refrigerant gas return exclusive passages, and liquid refrigerant gas inflow pipe By piping in a multi-circuit configuration with a liquid refrigerant gas dedicated passage, the recovery of the refrigerant gas into the recovery container progresses, and when a certain amount of the refrigerant gas flows in, the three-way switching valve is used to connect the recovery pipe to the recovery container. By periodically switching to the vaporized refrigerant gas dedicated passage formed by the return pipe and the return pipe for regeneration, it is possible to prevent the pressure and temperature inside the recovery container from becoming high and dangerous, and the liquefied refrigerant. Since the volume of the recovery pipe filled with gas decreases, recovery work can be performed smoothly due to the decrease in pressure and temperature in the recovery container, and the recovery efficiency of the refrigerant gas becomes extremely good, and the recovery work can be completed in a short time. Can be implemented in.

[0009]

EXAMPLE An example of the refrigerant gas recovery apparatus according to the present invention will be described below with reference to the piping system diagram shown in FIG.

The apparatus of the present invention comprises an introduction unit for introducing the refrigerant gas flowing from the inflow port 1 into the intake port valve 4 from the inflow pipe 3 having the air purge button 2, and an exchange type for removing impurities from the introduced refrigerant gas. The separation unit including the filter 5 and the compression unit including the compressor 6 for sucking and compressing the refrigerant gas, and the refrigerant gas introduced through the electromagnetic opening / closing valve 7 are condensed by the condenser 9 which is cooled by the cooling fan 8. And a condensing unit for delivering the liquid refrigerant gas in the delivery pipe 10 and the delivery liquid 1
A recovery pipe 11 connected to 0 and a recovery container unit for recovering to a recovery container 13 via a container valve 12 are connected in series by piping, and a delivery pipe 10 is provided between the condensation unit and the recovery container unit. In a refrigerant gas recovery device in which a return pipe 14 for regeneration connected to the inflow side of the separation unit is branched via an electromagnetic switching valve 15, an electromagnetic opening / closing valve 16 is provided between the compression unit and the condensing unit. The exhaust port 17 which is released through the branch pipe is provided, and the condensing unit and the electromagnetic switching valve 1 are connected.
5, the delivery pipe 10 is branched to form a liquid refrigerant gas inflow pipe 18, the end of which is piped to the recovery pipe 11, and a manual three-way switching valve 19 is interposed in the pipe portion. A part of the recovery pipe 11 that is continuous with the regeneration return pipe 14 is shared by the return pipe 20, and the return pipe 20 and the regeneration return pipe 14 are used as dedicated passages for returning vaporized refrigerant gas, and
The liquid refrigerant gas inflow pipe 18 is laid in a multi-circuit configuration having a passage for exclusive use of the liquid refrigerant gas, and an air purge button 21 is provided in a recovery pipe portion commonly used for the inflow of the liquid refrigerant gas and the return of the vaporized refrigerant gas. The low pressure gauge 22 is provided on the inflow side of the separation unit, which is the low pressure side, the high pressure gauge 23 is provided on the delivery pipe 10 of the condensing unit, and the tank gauge 24 and the sight glass 25 are provided on the collection pipe 11 of the collection container unit. It is a feature of the refrigerant gas recovery device. Incidentally, 26 is a safety valve, and C is a case exterior.

In the refrigerant gas recovery device constructed as described above, the target refrigerant gas is taken in through the suction port 1,
The pressure is displayed by the low pressure gauge 22, and the intake valve 4
The air in the pipe until then is expelled in a short time through the air purge button 2 due to the pressure of the gas.

Next, while rotating the compressor 6, the electromagnetic on-off valves 7, 16, the three-way valve 19, and the container valve 12 are opened to make the inside of the pipe and the recovery container 13 into a vacuum state, and the gauges 22, 23, 24 are provided. Check with.

The compressor 6 continues to operate in a vacuum state,
Next, after closing the electromagnetic opening / closing valve 7 and opening the suction port valve 4, the refrigerant gas fills the pipes and the recovery container 13 all at once, and the pressures thereof are displayed on the gauges 22, 23, 24.

The refrigerant gas flowing in passes through the filter 5 and the compressor 6 by the operation of the compressor 6, and the electromagnetic opening / closing valve 16
Then, the refrigerant gas compressed in the condenser 9 is cooled by the cooling fan 8 and liquefied.

The liquefied liquefied refrigerant gas passes through the liquid refrigerant gas inflow pipe 18 and is manually operated.
It is introduced into the collection container 13 via the 9 and 12 container valves.

Pressurization due to continuous operation of the compressor 6 continues, and the pressure gradually increases, and the temperature in the pipe and in the recovery container 13 also rises. Therefore, the following operation is repeated and the liquefied refrigerant is stored in the recovery container 13. Collect gas.

First, from the relationship between the temperature rise and the pressure calculated from the refrigerant saturation curve of the refrigerant gas, the inflow of the refrigerant gas is blocked by the suction port valve 4 within the allowable pressure range of the compressor 6, and the three-way switching valve is used. 19 is switched to the return pipe 20 side, only the upper gas in the recovery container 13 is returned from the return pipe 20 to the low pressure side of the compressor 6 through the regeneration return pipe 14, and then the three-way switching valve 19 is switched to the original state. The returned vaporized refrigerant gas is pressurized again by the compressor 6 and sent to the condenser 9 to be liquefied, and the recovery container 13 in which the pressure and temperature are lowered
Send it in.

After that, the inlet port valve 4 is opened again, a new refrigerant gas is introduced and liquefied, and this is sent into the recovery container 13.

By repeating such an operation, a specified amount of the liquefied refrigerant gas is recovered in the recovery container 13.

[0020]

As described above, according to the refrigerant gas recovery device of the present invention, the liquid refrigerant gas inflow pipe is branched between the condensing unit and the switching valve, and this is connected to the recovery pipe. Then, a three-way switching valve is interposed in the pipe portion, a part of the recovery pipe continuous with the regeneration return pipe is used as a return pipe, and the return pipe and the regeneration return pipe are used as vaporized refrigerant gas return dedicated passages. At the same time, by piping the liquid refrigerant gas inflow pipe in a multiple circuit configuration with a passage for exclusive use of the liquid refrigerant gas, the recovery of the refrigerant gas into the recovery container progresses, and when a certain amount of the refrigerant gas flows in, the three-way switching valve is recovered. The recovery pipe leading to the container is periodically switched to the vaporized refrigerant gas dedicated passage formed by the return pipe and the return pipe for regeneration,
The pressure and temperature inside the recovery container are both high and prevent a dangerous state.In addition, if the bottom part of the recovery container is filled with the liquefied refrigerant gas and the upper part is filled with the vaporized refrigerant gas, the volume of the recovery container decreases. Therefore, by switching to the passage for exclusive use of the vaporized refrigerant gas return of the regeneration return pipe, the recovery work for decreasing the pressure and the temperature in the recovery container can be smoothly performed.

Further, by interposing the three-way switching valve in the container of a general one-port valve, the liquid refrigerant gas in the passage for exclusive use of the liquid refrigerant gas does not have to be returned to the regeneration return pipe of the vaporized refrigerant gas, so that the refrigerant gas is recovered. It is possible to provide a refrigerant gas recovery device that has extremely good efficiency, can perform recovery work in a short time, and can efficiently recover a refrigerant gas from the inside of a device or the like that uses a refrigerant gas without releasing it into the atmosphere. it can.

[Brief description of drawings]

FIG. 1 is a piping system diagram of a refrigerant gas recovery device according to the present invention.

[Explanation of symbols]

1 Inlet 2, 21 Air Purge Button 3 Inlet Pipe 4 Inlet Valve 5 Filter 6 Compressor 7, 16 Electromagnetic Open / Close Valve 8 Cooling Fan 9 Condenser 10 Outlet Pipe 11 Recovery Pipe 12 Container Valve 13 Recovery Container 14 Regeneration Pipe 15 Electromagnetic switching valve 17 Exhaust port 18 Liquid refrigerant gas inflow pipe 19 Three-way switching valve 20 Return pipe 22 Low pressure gauge 23 High pressure gauge 24 Tank gauge 25 Sight glass

Claims (1)

[Claims] 1. An introduction unit for introducing a refrigerant gas flowing in from an inlet into an inlet valve from an inflow pipe equipped with an air purge button, a separation unit for removing impurities from the introduced refrigerant gas, and a suction and suction of the refrigerant gas. A compression unit for compression, a condensing unit for condensing the refrigerant gas introduced through the opening / closing valve, and a recovery container unit for recovering the condensed liquid refrigerant gas into a recovery container through the recovery pipe and the container valve are connected in series. With a pipe connection to, between the condensation unit and the recovery container unit, in the refrigerant gas recovery apparatus, a return pipe for regeneration connected to the inflow side of the separation unit is branched through a switching valve, An exhaust port opened via an opening / closing valve is branched between the compression unit and the condensing unit, and the condensing unit and the A liquid refrigerant gas inflow pipe is branched between the exchange valve and the recovery pipe, and the recovery pipe is provided with a three-way switching valve interposed between the recovery refrigerant pipe and a part of the recovery pipe. As a return pipe, the return pipe and the regeneration return pipe are used as a vaporized refrigerant gas return dedicated passage, and the liquid refrigerant gas inflow pipe is piped in a multiple circuit configuration having a liquid refrigerant gas dedicated passage. Refrigerant gas recovery device.