JPH0715340B2 - Freon gas recovery device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a CFC gas recovery device for recovering CFC gas which is mainly used in a vehicle air conditioner.

(Prior Art) In this type of device, a regeneration unit for regenerating the recovered CFC gas is provided, and the regeneration unit includes, for example, a cylinder storing the liquefied CFC gas and impurities in the CFC liquid. A filter dryer to be removed and a liquid pump for circulating the liquid freon are connected by a pipe line to form a closed circuit, and the liquid freon is circulated in the closed circuit for regeneration.

(Problems to be Solved by the Invention) However, at the time of starting the regeneration unit, that is, at the time of starting the liquid pump, since Freon vaporized by absorbing heat from the outside is accumulated in the pipeline of the regeneration unit, There was a problem that the liquid pump compressed the gas and the CFC did not flow in the pipe, and the regeneration cycle could not be performed normally.

Therefore, it is an object of the present invention to solve the above problems and provide a CFC gas recovery device that normalizes the regeneration cycle at the time of starting the regeneration unit.

(Means for Solving the Problems) In order to achieve the above object, a flon gas recovery apparatus according to the present invention includes an introduction unit for introducing flon gas, a separation unit for removing impurities from the introduced flon gas, and condensing the flon gas. A condensing unit, a compressor for sucking and compressing CFC gas, and a regenerating unit that stores condensed liquid CFC and regenerates it as necessary, the regeneration unit includes a cylinder that stores at least the liquid CFC and impurities. A filter dryer to remove,
In a CFC gas recovery device in which a liquid pump is connected by a pipe line to form a closed circuit, a bypass pipe that connects a pipe line on the outlet side of the liquid pump of the regeneration unit and a pipe line on the inlet side of the condensation unit. In addition to providing a passage, the bypass pipeline is provided with a communication control means for communicating the bypass pipeline at the time of starting the liquid pump and shutting off the bypass pipeline after a predetermined time.

(Operation) Therefore, since the bypass pipe line is provided between the liquid pump and the condensing unit and the bypass pipe line is communicated with the liquid pump for a predetermined time at the time of starting, the inside of the pipe line of the regeneration unit is within the predetermined time. The chlorofluorocarbon gas accumulated in the recycle unit is sent out to the low-pressure condensing unit, and only the liquid chlorofluorocarbon remains in the closed circuit of the regenerating unit from which the gas has been removed, allowing the liquid pump to operate normally. It is what is done.

Embodiments Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1, the CFC gas recovery device 1 is connected to a refrigerant circuit of a vehicle air conditioner and is connected to a CFC gas (eg
2: An introduction unit 2 for introducing the chemical formula Cl ₂ F ₂ ), a separation unit 3 for removing impurities such as water and oil from the introduced CFC gas, a condensing unit 4 for condensing the CFC gas, and a suction and compression for the CFC gas. Compressor 5
And a regeneration unit 6 that stores the condensed liquid fluorocarbon gas and regenerates it as needed.

The introduction unit 2 includes a manifold 10 having a connection joint 8 connected to the high pressure side and a connection joint 9 connected to the low pressure side of a refrigerant circuit (not shown) mounted on the vehicle. The manifold 10 has pressure gauges 11a and 11b on the high pressure side and the low pressure side, respectively, and a pipe line 14 is connected to a connection joint 12 between the connection joints 8 and 9 to reach the separation unit 3. In the pipe line 14, a packless valve 17, a check valve 18, a pressure switch 19, a pressure gauge 20, and a solenoid valve 21 are arranged in this order.
The flow of CFCs is controlled by opening and closing 7,21. The pressure switch 19 is connected to the input side of the compressor 5, and when the pressure becomes lower than a predetermined pressure, a stop signal is issued to automatically stop the compressor.

Further, a sight glass 22 is provided between the backless valve 17 and the check valve 18 so that the operator can visually confirm the collection state of the CFC gas during the collection work. Therefore, it is possible to easily determine whether or not the CFC gas can be reliably recovered at the time of recovery,
Further, even if there is a problem with the device, it can be dealt with reliably.

The solenoid valve 21 is controlled to open and close in response to a control signal from a central processing unit (not shown).

The separation unit 3 mainly includes a dryer 23 that removes water.
A heat exchange oil separator 25 that liquefies the CFC gas and removes oil by heat exchange, and a filter oil separator 24 that is arranged on the upstream side of the heat exchange oil separator.
It consists of and.

The dryer 23 uses a particulate adsorbent such as activated carbon as a filter to capture and remove water, dust and the like from the fluorocarbon gas passing through it. The dryer 23 is provided with a monitor gauge 23a for measuring the filter clogging by the pressure difference between the upstream side and the downstream side.

Filters 26 are provided in the center of the oil separators 24, respectively, so that the oil separated from the CFC gas introduced from above passes through a discharge pipe 27 provided below the filter 26. ing. A backless valve 28 is provided at the lower end of the discharge pipe 27, and the oil separator 24 on one side is pulled out to the measuring cylinder 29 by this valve 28. Then, the CFC gas that has passed through the filter oil separator 24 is piped.
It is introduced from above the heat exchange oil separator 25 via 30.

Thus, by interposing the oil separator 24 in front of introducing it into the heat exchange oil separator 25, impurities such as oil can be reliably removed from the CFC gas, and the purity of CFC gas can be increased to improve heat exchange efficiency. .

In the heat exchange oil separator 25, the heat exchange container is
Freon gas is ejected into the inside of 25a, so that the Freon gas is adiabatically expanded. As a result, the temperature inside the heat exchange container is cooled to 0 ° C to 20 ° C.

The chlorofluorocarbon after adiabatic expansion is sent from the pipe 31 to the compressor 5
Is sucked to the suction side, pressurized from the discharge side, introduced from the conduit 32 to the other oil separator 34, and the oil mixed in by the compressor 5 is removed. The separated oil flows through the filter 44, the capillary tube 45, the pipe line 47 provided with the valve 46, and the compressor 5
Is returned to the suction side. Then, the CFC gas after passing through the oil separator 34 is returned again to the heat exchange oil separator 25 through the pipe 35, is introduced into the heat exchange pipe 36 arranged in the heat exchange container 25a, and is adiabatic expansion described above. As it is cooled, the CFC gas is liquefied by this. Thus, as described above, the heat exchanger can save energy by cooling using the adiabatic expansion heat of the CFC gas.

Further, the oil separated from the chlorofluorocarbon gas is drawn out to the measuring cylinder 38 by the valve 37.

The liquefied chlorofluorocarbon gas is led from the heat exchange oil separator 25 through the pipe line 40, and is collected in the cylinder 43 provided in the regeneration unit 6 via the pressure switch 41 and the check valve 42.

The cylinder 43 is composed of a two-port valve 49 connecting the above-mentioned pipeline 40 and the pipeline 48 for outlet and a container 50. Inside the container 50, an injection pipe 51 extending from the valve 49 and a suction pipe. The upper pipe 52 is extended, and first and second level sensors (not shown) that detect the amount of the stored liquid fluorocarbon gas.
Is provided. The first and second level sensors are arranged at predetermined positions on an extension piece (not shown) extending from the valve 49 to the vicinity of the bottom of the container 50, and have a capacity of, for example, 80.
The first level sensor is attached at the position of%, and the second level sensor is attached at the position of 30% capacity. These first and second sensors detect the level of the CFC liquid by, for example, a known float type, and the detection signal of the first level sensor is sent to a central control unit (not shown). The compressor 5 is stopped by this detection signal, and the fluorocarbon recovery action is automatically stopped. Further, the second level sensor detects the shortage of the refrigerant liquid inside when the refrigeration cycle described later is being supplied and stops the supply.

The outlet pipe line 48 connected to the two-port valve 49 leads to a filter dryer 55 having a monitor gauge 55a, and a pipe line 56.
It is connected to the above-mentioned pipeline 40 via the liquid pump 57 and the check valve 58 provided above, and when the liquid pump 57 is operated, it passes through the closed circuit of the pipelines 48, 56, 40 and inside the cylinder 43. It is designed to circulate liquid CFCs.

In the dryer 55, water, dust, oil, etc. are removed similarly to the dryer 23 described above.

In addition, between the two-port valve 49 and the filter dryer 55,
A so-called bug-like reuse joint 59 is provided, from which the regenerated liquid refrigerant is taken out.

Between the liquid pump 57 and the check valve 58, a moisture indicator 60 that displays the water content in the liquid CFC is arranged so that the regeneration state of the liquid CFC used can be confirmed. The moisture indicator 60 is formed by applying a known paint whose color changes according to the water content on the inner surface of the sight glass. Therefore, the operator can easily confirm whether or not the water content in the liquid flon has been sufficiently removed, and if the water content has not been removed, the regeneration unit 6 is continuously circulated and the filter dryer 55 removes the water content.

Further, a bypass line 62 is connected to the line 56 between the moisture indicator 60 and the check valve 58, and the tip of the bypass line 62 is connected to the line 30 which is an opening in the oil separator 25. . An electromagnetic valve 63 is provided in the bypass line 62, and the electromagnetic valve 63 is provided in the drive circuit of the liquid pump 57 as shown in FIG.
Connected through. The timer relay 64 energizes the electromagnetic valve 63 for a predetermined time (for example, 5 to 5 seconds) when the drive switch 61 is turned on. Therefore, at the start of regeneration of the liquid CFC, that is, the liquid pump 57
When is started, the electromagnetic valve 63 is opened for a predetermined time so that the gas in the pipelines 48 and 56 can be extracted to the heat exchange oil separator 25. That is, first, the gas accumulated in each pipe of the regeneration unit 6 is introduced into the heat exchange oil separator 25 to be removed from the regeneration unit 6, the liquid pump 57 can be operated, and only the liquid freon is circulated. A filter dryer 55 is passed through to perform a regeneration operation.

In the figure, reference numeral 65 is a valve, 66 is a discharge valve, and 67 is a pressure gauge.

According to the above configuration, when recovering CFCs from the refrigerant circuit of the automobile, the manifold 10 is connected to the high pressure pipe and the low pressure pipe of the refrigerant circuit to drive the compressor 5. As a result, chlorofluorocarbon gas is introduced from the refrigerant circuit into the recovery pipe line 14, impurities such as water, oil, and dust are removed by the separation unit 3, and the adiabatic expansion heat of fluorocarbon gas is used by the heat exchange oil separator 25. It is liquefied and collected in the cylinder 43. At this time, when the liquid freon in the cylinder 43 reaches about 80%, the first level sensor detects this and stops driving the compressor 5 and closes the valve 21 to stop the recovery of the refrigerant.

In addition, while collecting CFC gas from the refrigerant circuit of the automobile,
When the inside pressure of 14 is reduced to a predetermined pressure, the pressure switch 19 is turned off, the compressor 5 is stopped, and at the same time, the valve 21 is closed, which also stops the collection of CFCs.

On the other hand, the liquid CFC collected in the cylinder 43 is injected into the refrigerant circuit of another automobile or the like for reuse. In this case, the connection joint 12 is connected to the reuse joint 59.

(Effects of the Invention) As described above, according to the present invention, the bypass line is provided between the liquid pump and the condensing unit, and the bypass line is communicated for a predetermined time when the liquid pump is started. Freon gas that has accumulated in the regeneration unit can be removed via the bypass line, which allows the liquid pump to operate normally, which enables the normal operation of the regeneration cycle and the shortening of the regeneration time. It is what is done.

[Brief description of drawings]

FIG. 1 is a block diagram of a CFC gas recovery device according to the present invention,
FIG. 2 shows a drive circuit for the liquid pump and the electromagnetic valve. 1 ... Freon gas recovery device, 2 ... Introduction unit, 3 ...
... Separation unit, 4 ... Condensing unit, 5 ... Compressor, 6 ... Regeneration unit, 43 ... Cylinder, 55 ... Filter dryer, 57 ... Liquid pump, 62 ... Bypass line, 63 ... Electromagnetic valve .

Claims (1)

[Claims] 1. An introduction unit for introducing CFC gas, a separation unit for removing impurities from the introduced CFC gas, a condensing unit for condensing CFC gas, a compressor for sucking and compressing CFC gas, and a condensed liquid CFC. A regeneration unit for regenerating as necessary, wherein the regeneration unit contains at least a liquid fluorocarbon container, a filter dryer for removing impurities,
In a CFC gas recovery device in which a liquid pump is connected by a pipe line to form a closed circuit, a bypass pipe that connects a pipe line on the outlet side of the liquid pump of the regeneration unit and a pipe line on the inlet side of the condensation unit. A fluorocarbon gas is provided with a passage, and a communication control means is provided in the bypass pipeline for communicating the bypass pipeline at the time of starting the liquid pump and for disconnecting the bypass pipeline after a predetermined time. Recovery device.