JPH0359366A - Cfc recovery device - Google Patents

Abstract

PURPOSE:To provide a CFC recovery device having a superior recovering efficiency, a simple structure and less-expensive by a method wherein an inner wall of a condensing pipe is formed with axial grooves and a pressure within a recovery tank is released out of the recovery tank when the liquified CFC is recovered into the CFC recovery tank. CONSTITUTION:A heat exchanger of two-system is composed of a condensing pipe 21 to which recovered CFC is supplied and an evaporating pipe 22 to which refrigerant is supplied. Both ends of the evaporating pipe 22 are closed by a lid member 24, an extension part 25 of the condensing pipe 21 is extended, one of the extending parts 25 is connected to the final recovery tank 19. CFC liquified at the condensing pipe 21 of the two-system heat exchanger flows to the final recovery tank 19 through the extension part 25 of the condensing pipe 21 due to its own weight. As the CFC liquid is filled in the final recovery tank 19, a pressure within the tank is increased. However, the inner wall of the condensing pipe 21 is formed with axial grooves 28, the pressure within the recovery tank 19 is released out of the recovery tank through these grooves.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for recovering fluorocarbon gas used as a refrigerant in, for example, an air conditioner for automobiles (hereinafter referred to as an air conditioner).

[Prior Art] Freon is used as a refrigerant in the refrigeration circuit in coolers or air conditioners for motor vehicles. When this CFC is released into the atmosphere, it has a negative impact on the ozone layer surrounding the earth. For this reason, for example, when scrapping a car or repairing a car cooler or air conditioner, it is necessary to prevent fluorocarbon gas from being released into the atmosphere, and to reuse fluorocarbons, which are produced in limited quantities, by removing fluorocarbons from the refrigeration circuit. need to be collected.

Conventional fluorocarbon recovery equipment uses a compressor to suck in the recovered fluorocarbons, condenses them into a liquid in a condenser, and collects them in a recovery tank. This condenser is a two-system heat exchanger consisting of a condensing tube to which recovered fluorocarbon is supplied, and an evaporation tube provided adjacent to the condensing tube to which refrigerant is supplied. The two-system heat exchanger and the recovery tank are connected by piping for supplying the liquefied fluorocarbons collected in the heat exchanger by their own weight, and the pressure corresponding to the volume of the liquefied fluorocarbons supplied to the final recovery tank is connected. They were connected by pressure equalizing pipes to allow the water to escape.

[Problems to be Solved by the Invention] In conventional devices, as the recovered liquefied fluorocarbons flow into the recovery tank, the pressure in the recovery tank increases, and this pressure prevents the recovered fluorocarbons from flowing into the tank. It was reducing efficiency.

Although these drawbacks can be improved to some extent by providing a pressure equalizing pipe, the structure is complicated and the cost is high.

Therefore, an object of the present invention is to provide a fluorocarbon recovery device that is excellent in recovery efficiency, has a simple structure, and is inexpensive.

[Means for Solving the Problems] According to the present invention, a two-system heat exchanger includes a condensing pipe to which recovered fluorocarbons are supplied, and an evaporating pipe arranged adjacent to the condensing pipe and to which refrigerant is supplied; In the fluorocarbon recovery device including a liquefied fluorocarbon recovery tank connected to the outlet of the condensation pipe 6'R, and a refrigeration circuit connected to the evaporation pipe and having the evaporation pipe as an evaporator, A fluorocarbon recovery system characterized in that a groove is formed in the axial direction of the pipe so that when liquefied fluorocarbons are recovered into the fluorocarbon recovery tank, the pressure inside the recovery tank is released to the outside of the recovery tank through the groove. A device is obtained.

[Function] When recovering liquefied fluorocarbons to the fluorocarbon recovery tank, the pressure inside the fluorocarbon recovery tank is released to the outside through the groove in the inner wall of the condensation pipe.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic diagram of a fluorocarbon recovery device according to an embodiment of the present invention. Although the part to be recovered is not shown, it is, for example, an air conditioner circuit of an automobile. The liquid or gaseous fluorocarbon contained inside the recovery section is supplied from the inlet 11 of the recovery device to the suction side of the compressor 13 via piping 12. The compressor 13 compresses the sucked gaseous Freon and supplies it to the discharge side. A condenser 14 is connected to the discharge side of the compressor 13. In the condenser 14, the fluorocarbon gas is cooled and liquefied. The liquefied Freon is supplied from the outlet of the condenser 14 to a filter/dryer 15, where impurities, moisture, acid, etc. are removed, and then supplied to a primary recovery tank 16.

The primary recovery tank 16 includes first and second outlets 16a and 16b. Liquid fluorocarbon is taken out from the first outlet 16a, and gaseous fluorocarbon is taken out from the second outlet 16b. Liquid freon is sent to the expansion valve 17 via piping 12.
The water is supplied to the evaporation side of the two-system heat exchanger 18 via. The expansion valve 17 is an automatic expansion valve whose opening degree is adjusted by the pressure on the outlet side of the two-system heat exchanger 18.

The two-system heat exchanger 18 includes an evaporation system 18a where liquid fluorocarbon is supplied and vaporized, and a condensation system 18b where gaseous fluorocarbon is supplied and is cooled and liquefied, and heat exchange is performed between these two circuits. This is what we do. The fluorocarbons supplied to the evaporation system 18a are vaporized here and returned to the suction side of the compressor 13 via the piping 12.

On the other hand, the gaseous fluorocarbon taken out from the second outlet 16b of the primary recovery tank 16 is supplied to the condensing side 18b of the two-system heat exchanger 18 via the pipe 12.

Here, the gaseous Freon is cooled and liquefied by the endothermic action in the evaporation system 18a. The liquefied Freon is collected in one final collection tank.

FIG. 2 is a half-sectional side view showing the configuration of a two-system heat exchanger used in the fluorocarbon recovery device of FIG. 1.

FIG. 3 is a sectional view taken along the line ■-■ in FIG. 2.

The two-system heat exchanger has a condensing pipe 21 to which recovered fluorocarbons are supplied.
and an evaporation tube 2 which is arranged concentrically with and adjacent to the condensation tube 21 so as to surround it, and to which refrigerant is supplied.
It is composed of 2. A large number of partition plates 23 are provided radially in the evaporation tube 22, and the condensation tube 21 and the evaporation tube 22 are structurally connected by these partition plates 23.

Both ends of the evaporation tube 22 are sealed with a lid 24, and the condensation tube 2
1 extension 25 is led out. One of the extensions 25 of the condensing pipe 21 is connected to the final recovery tank 19.

Furthermore, an inlet 26 and an outlet 27 of the evaporation tube 22 are provided from the side of the lid 24 . As shown in FIG. 3, a large number of grooves 28 are formed on the inner wall of the condensing tube 21, extending in a direction parallel to the tube axis. These grooves 28 are for providing a gas vent path in the tube axis direction within the condensing tube 21 when the inside of the condensing tube 21 is filled with liquefied fluorocarbon.

According to the fluorocarbon recovery device configured in this manner, the fluorocarbons liquefied in the condensing pipe 21 of the two-system heat exchanger flow through the extension 25 of the condensing pipe 21 to one final recovery tank due to its own weight. As one final recovery tank is filled with fluorocarbon liquid, the pressure inside the tank increases. However, by forming grooves 28 in the tube axis direction on the inner wall of the condensing tube 21, the pressure within one recovery tank is released to the outside of the recovery tank via these grooves 28.

Although the fluorocarbon recovery device shown in FIG. 1 is a circulating self-cooling type device, the present invention is not limited thereto, and can be similarly applied to other cooling type devices as shown in FIG.

In FIG. 4, gaseous fluorocarbons taken out from the recovery section are supplied from the inlet 11 of the recovery device to the condensing side 18b of the two-system heat exchanger 18 via piping 12. On the other hand, 2
The evaporation system 18a of the system heat exchanger 18 includes a compressor 4.
1, a cooling circuit consisting of a condenser 42 and a capillary tube 43 is connected. In the evaporation system 18a of the two-system heat exchanger 18 of this cooling circuit, the refrigerant circulating within the cooling circuit evaporates within the evaporation tube, absorbs heat from the fluorocarbon gas flowing inside the adjacent condensation tube, and liquefies it. The thus liquefied Freon is supplied to one recovery tank via the condensing pipe extension 25.

[Effects of the Invention] According to the present invention described above, liquefied fluorocarbon can be efficiently recovered into the final recovery tank without providing a pressure equalization pipe in the final recovery tank, and the configuration of the device can be simplified.
Cost reduction can be achieved.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a fluorocarbon recovery device according to an embodiment of the present invention, FIG. 2 is a half-sectional side view showing the configuration of a two-system heat exchanger used in the fluorocarbon recovery device of the present invention, and FIG. FIG. 2 is a sectional view taken along the line ■-■ in FIG. 2, and FIG. 4 is a schematic diagram showing the configuration of a fluorocarbon recovery device according to another embodiment of the present invention. 11... Inlet, 12... Piping, 13... Compressor, 14... Condenser, 15... Filter/dryer, 16... Primary recovery tank, 17...
Expansion valve, 18... Two-system heat exchanger, 19... Final recovery tank, 21... Condensing pipe, 22... Evaporating pipe, 23
... Partition plate, 24 ... Lid body, 26 ... Evaporation tube inlet, 27 ... Evaporation tube outlet, 28 ... Groove. Figure 1 Figure 2

Claims (1)

[Claims] 1. A two-system heat exchanger having a condensing pipe to which recovered fluorocarbons are supplied, and an evaporation pipe arranged adjacent to the condensing pipe to which refrigerant is supplied, and a liquefied fluorocarbon recovery tank connected to the outlet of the condensing pipe. and a refrigeration circuit connected to the evaporation tube and having the evaporation tube as an evaporator, a fluorocarbon recovery device comprising: a refrigeration circuit connected to the evaporation tube and having the evaporation tube as an evaporator; A fluorocarbon recovery device, characterized in that, when recovering fluorocarbons, pressure within the recovery tank is released to the outside of the recovery tank via the groove.