JP3108270B2 - Refrigerant recovery device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerant recovery device for recovering unnecessary refrigerant from a device to be recovered such as a refrigerator, an air conditioner, or a semiconductor manufacturing device.

[0002]

2. Description of the Related Art Freon gas used as a refrigerant in refrigerators and air conditioners has a problem of destroying the earth ozone layer.
For this reason, in recent years, a refrigerant recovery device as disclosed in, for example, Japanese Patent Application Laid-Open No. 3-15267 (F25B45 / 00) is designed to recover a refrigerant that is no longer necessary in such a refrigerator without dissipating it into the atmosphere. It is becoming.

[0003] As is clear from the publication, conventionally, all the liquid refrigerant and gaseous refrigerant remaining in the device to be recovered are once gasified, and the gaseous refrigerant is sucked by a compressor. In addition, while being pressurized, it is liquefied in a heat exchanger such as a condenser and collected in a collection container (such as a cylinder). This is because when the compressor sucks the liquid refrigerant,
This is because the compressor is damaged.

[0004]

As described above, conventionally, all the liquid refrigerant in the device to be recovered is once gasified, then sucked by the compressor, pressurized and condensed, and then recovered in the recovery container. However, there is a problem that extremely long time is required for collection. In addition, when the liquid refrigerant is once gasified, the temperature of the refrigerant on the side of the device to be recovered is extremely lowered, so that there is a problem that the recovery rate is deteriorated.

The present invention has been made to solve the above-mentioned conventional technical problem, and provides a refrigerant recovery apparatus capable of reducing the time spent for recovering the refrigerant and improving the recovery efficiency. The purpose is to:

[0006]

According to a first aspect of the present invention, there is provided a refrigerant recovery apparatus for pressurizing a refrigerant between a recovery side connection port connected to a recovery apparatus and a recovery side connection port connected to a recovery container. It is equipped with a main recovery circuit in which a compressor and a heat exchanger for condensing refrigerant are sequentially connected to each other.A liquid refrigerant bypass circuit is provided from the connection port on the recovery side to the connection port on the recovery side, and the connection port side on the recovery side. The first and second on-off valves are respectively provided in the liquid refrigerant bypass circuit and the main recovery circuit at a stage subsequent to the branch point of
The liquid refrigerant bypass circuit and the main recovery circuit at the stage before the junction on the recovery side connection port side are provided with valves for preventing backflow, respectively.

Further, in the refrigerant recovery apparatus according to the present invention, the first on-off valve is opened, the second on-off valve is closed, and the liquid refrigerant in the apparatus to be recovered is recovered by the liquid refrigerant bypass circuit. The mode can be switched between an operation mode in which the first on-off valve is closed, a second on-off valve is opened, and the compressor is operated to recover the gas refrigerant in the device to be recovered by the main recovery circuit. It is characterized by.

Further, in the refrigerant recovery apparatus according to the third aspect of the present invention, the pressure-reducing pipe having the second recovery-side connection port connected at one end to the pressure-reduction connection port of the recovery container is provided in the second aspect. A third on-off valve is provided downstream of the on-off valve and connected to the main recovery circuit, and a third on-off valve is provided downstream of the second recovery-side connection port.

Further, in the refrigerant recovery apparatus according to a fourth aspect of the present invention, in the third aspect, the first and third on-off valves are opened, the second on-off valve is closed, and the compressor is operated to recover the recovery container. Operating mode in which the liquid refrigerant in the device to be recovered is recovered by the liquid refrigerant bypass circuit while reducing the pressure inside, the first and third on-off valves are closed, the second on-off valve is opened, and the compressor is operated. The main recovery circuit can switch between an operation mode for recovering the gas refrigerant in the recovery target device.

A fifth aspect of the present invention is a refrigerant recovery apparatus.
In the above, the decompression device is provided in the main recovery circuit in the stage after the branch point between the liquid refrigerant bypass circuit and the main recovery circuit, and in the stage before the junction, and a compressor is connected to the main recovery circuit between these decompression devices. I do.

[0011] The refrigerant recovery apparatus of the invention of claim 6 is claim 1.
, A start-up load reducing bypass circuit that connects the suction side and the discharge side of the compressor is provided, and the starting load-reducing bypass circuit is provided with a fourth on-off valve.

[0012]

According to the refrigerant recovery apparatus of the present invention, a liquid refrigerant bypass circuit is provided from the recovery-side connection port to the recovery-side connection port,
First and second on-off valves are respectively provided in the liquid refrigerant bypass circuit and the main recovery circuit at a stage after the branch point on the recovery side connection port side, and the liquid refrigerant bypass circuit and the main recovery at a stage before the junction on the recovery side connection port side are provided. In the operation mode in which the first on-off valve is opened and the second on-off valve is closed, the liquid refrigerant in the device to be recovered is passed through the compressor without passing through the compressor because valves for preventing backflow are provided in the circuit. The liquid refrigerant bypass circuit allows the liquid to be directly collected in the collection container.

Therefore, the conventional operation of once gasifying the liquid refrigerant and then condensing it by pressurizing and condensing it is eliminated.
The collection time can be shortened, and the collection efficiency can be improved.

In particular, as in the refrigerant recovery apparatus according to the third aspect of the present invention, a pressure reducing pipe having at one end a second recovery side connection port connected to the pressure reduction connection port of the recovery vessel is provided at a stage subsequent to the second on-off valve. If a third opening / closing valve is provided downstream of the second collection-side connection port, a collection connection port that has two collection containers and connects one of them to the collection-side connection port. In the case where the other can be a decompression connection port connected to the second recovery-side connection port, the first and third on-off valves are opened, the second on-off valve is closed, and the compressor is closed. In the operating mode of operation, the liquid refrigerant in the device to be recovered can be directly recovered by the liquid refrigerant bypass circuit while the pressure in the recovery container is reduced.

Therefore, the liquid refrigerant can be recovered more quickly. Since the pressure reducing pipe is provided with the third opening / closing valve, even if the collection container has only one port, the pressure reducing pipe can be ignored by closing and placing the third valve. The refrigerant can be recovered without any trouble by the liquid refrigerant bypass circuit and the main recovery circuit.

Further, a pressure reducing device is provided in the main recovery circuit at a stage after the branch point between the liquid refrigerant bypass circuit and the main recovery circuit and before the junction, and the main recovery circuit between these pressure reduction devices is provided. If the compressor is connected, the liquid component in the refrigerant sucked into the main recovery circuit is smoothly gasified, and is pressurized by the compressor without obstructing liquid recovery from the liquid refrigerant bypass circuit. The refrigerant can be liquefied smoothly.

Further, according to the present invention, a starting load reducing bypass circuit for connecting the suction side and the discharge side of the compressor is provided, and a fourth opening / closing valve is provided in the starting load reducing bypass circuit. By opening the fourth on-off valve before starting the compressor, each on-off valve is closed when not in use to equalize the pressure on the suction side and the discharge side of the compressor in which the pressure difference is maintained, The starting load on the compressor can be reduced.

[0018]

Next, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of the refrigerant recovery device 1 of the present invention (excluding the recovery cylinder B), FIG. 2 is a longitudinal sectional side view of the refrigerant recovery device 1 of the present invention, and FIG. 3 is another refrigerant recovery device 1 of the present invention. FIG. 4 is a vertical sectional side view of the compressor 16, FIG. 5 is a configuration diagram of the refrigerant recovery machine 3 installed in the main body 2 of the refrigerant recovery device 1 of the present invention, and FIG. Figure, Figure 7
FIGS. 8 to 11 are diagrams illustrating the operation modes of the refrigerant recovery device 1, and FIGS. 8 to 11 are diagrams illustrating the flow of the refrigerant in the refrigerant recovery device 1 in each operation mode.

The refrigerant recovery apparatus 1 of the present invention has a horizontal frame 6 and a vertical frame 7 each formed by bending a steel pipe into a substantially U-shape, a main body 2, wheels 8, a weighing table 9, and a recovery container. And a collecting side cylinder B. The collecting cylinder B is usually handled separately, and is used by being connected to the refrigerant collecting machine 3 of the main body 2 during a collecting operation described later.

One end of the horizontal frame 6 and one end of the vertical frame 7 are connected at a right angle to each other by a connecting pipe 11, and the length from the connecting pipe 11 to the other end of the horizontal frame 6 is Is configured to be longer than the length up to the other end. A rotating shaft 8A of a relatively large-diameter wheel 8 is rotatably attached to the connecting pipe 11, and the wheels 8 are arranged on both sides of the connecting pipe 11. The other ends of the frames 6 and 7 are bent obliquely outward and protrude, and are formed as handle portions 12 and 13, respectively.

The distance from the connecting pipe 11 (that is, the long side of the frames 6, 7) to the outer ends of the handles 12, 13 in the vertical or horizontal direction is determined by the distance from the connecting pipe 11 to the wheels 8 Distance to the outer surface of
As long as the grounding surface is horizontal, the horizontal frame 6 or the vertical frame 7 which faces in the horizontal direction is horizontal even when any of the handles 12, 13 is grounded.

On the other hand, the main body 2 comprises a cubic case 14 in which the refrigerant recovery machine 3 is housed, and this case 14 is located inside a corner formed by the two frames 6, 7 so that the respective frames 6, 7 It is fixed to. The compressor 16, the suction fan 17, and the heat exchanger 18 constituting the refrigerant recovery machine 3 are juxtaposed on a wall (hereinafter, referred to as a bottom wall 14 </ b> A) of the case 14 on the horizontal frame 6 side. The other parts (collectively 19) of the collecting machine 3 are fixed to the vertical frame 7 side of the wall of the case 14 above (hereinafter, referred to as the top wall 14B).

Further, an electrical component 21 is disposed at an inner corner of the case 14 which is diagonally opposed to the corner on the side of the rotating shaft 8A.
The case 14 is fixed to a top wall 14B. The electrical component 21 includes a control circuit 22 and a switch 23
Are disposed on the ceiling wall 14B. Further, connection ports C1 to C3 described later are also arranged on the top wall 14B of the case 14.

A weighing table 9 is disposed on the handle 12 side of the case 14 and is fixed along the horizontal frame 6 to the weighing table 9. The heat exchanger 18 is installed on the side wall 14C side of the case 14 on the weighing table 9 side, and the fan 17 has a rotating shaft 8A.
Facing the side. Further, the compressors 16 are arranged on their side (the back side in FIG. 2). An intake hole 24 is formed in the side wall 14C corresponding to the heat exchanger 18, and an XY tilt sensor,
Alternatively, an inclination detector 26 as an inclination detecting means comprising a mercury switch or the like is attached.
6 is connected to the control circuit 22.

On the other hand, the compressor 16 is a horizontal rotary type (rotary type) compressor. As shown in FIG. 4, an electric motor 101 and a compression section 102 driven by a driving shaft 103 of the electric motor 102 are provided in a sealed container 100. It is configured to house. The electric motor 102 includes a stator 106 and the drive shaft 103.
And a fixed rotor 107, and a stator winding 108 is attached to the stator 106. Also, an electrical terminal 1 is provided on the outer surface of one end of the sealed container 100.
09 is attached.

The compression unit 103 is connected to the electrical terminal 1
It is arranged in the closed container 100 on the opposite side of the cylinder 09 and comprises a cylinder 111 and a roller 113 which rotates in the cylinder 111 by an eccentric portion 112 of the drive shaft 103. Further, an oil partition 114 is provided between the compression section 103 and the electric motor 101. The compressor 16 is installed on the bottom wall 14A with the compression section 103 facing the rotation shaft 8A.

The broken line in FIG. 4 shows the oil level in the compressor 16 during operation. Here, in order to ensure the sealing property between the cylinder 111 and the roller 113 of the compression section 103, the compression section 103 must be immersed to some extent on the oil surface. In the case of a horizontal rotary compressor, oil is collected in the compression section 103 due to a pressure difference during operation as shown in FIG.

Next, the refrigerant recovery machine 3 is configured as shown in FIG. That is, the refrigerant recovery machine 3 is provided with the compressor 1
6, fan 17, heat exchanger 18, connection ports C1 to C3, solenoid valves SV1 to SV4 as first to fourth on-off valves, oil separators 34 and 35, accumulator 36,
A capillary tube 37 for vaporization and a capillary tube 38 for liquefaction as decompression devices, check valves 39 and 40,
41, a strainer 42 and a safety valve 43.

The connection port C1 serving as the recovery-side connection port is connected to the pipe 47 via the strainer 42, and the pipe 46 branched from the pipe 47 connects the solenoid valve SV1 as the first on-off valve (at the branch point). Is located at the later stage)
The outlet of the solenoid valve SV1 is connected to a connection port C3 serving as a recovery-side connection port via a check valve 39 (located at a stage before the junction). The connection port C3 of the check valve 39 is in the forward direction. The piping 46, the solenoid valve SV1, and the check valve 39 constitute a liquid refrigerant bypass circuit 45.

The pipe 47 is connected to the inlet side of the capillary tube 37 via an electromagnetic valve SV2 (located at a stage subsequent to the branch point) as a second on-off valve, and is connected to the outlet side of the capillary tube 37. Reference numeral 48 is connected to the oil separator 34 through the heat exchanger 18. A pipe 49 on the refrigerant outlet side of the oil separator 34 is connected to the suction side of the compressor 16 via the accumulator 36 and the check valve 40, and a fourth section is provided between the inlet side of the check valve 40 and the discharge side of the compressor 16. The solenoid valve SV4 as an opening / closing valve is connected to a pipe 51 as a starting load reducing bypass circuit connected to the solenoid valve SV4. The check valve 40 has a forward direction on the suction port side of the compressor 16.

The discharge side of the compressor 16 is connected to an oil separator 35, and a pipe 52 on the refrigerant outlet side of the oil separator 35 is connected to the capillary tube 38 via the heat exchanger 18, and the outlet of the capillary tube 38 is reversed. It merges with the liquid refrigerant bypass circuit 45 via a stop valve 41 (located at a stage preceding the junction), and both are connected to the connection port C3. This check valve 41 also has a forward direction on the connection port C3 side. The pipe 54 on the oil outlet side of the oil separator 35 is connected to the inlet side of the check valve 40. The main recovery circuit 55 includes the above-described strainer 42 and the pipe 47 to the check valve 41, and the compressor 16 is connected to both the capillary tubes 3.
7 and 38.

A connection port C serving as a second recovery-side connection port
2 is a solenoid valve SV3 (a connection port C2
Is connected to the inlet side of the capillary tube 37, that is, to the subsequent stage of the solenoid valve SV <b> 2, and the safety valve 43 is connected to the discharge side of the compressor 16. I have. Further, reference numeral 57 denotes an oil recovery valve of the oil separator 35. The connection port C1 is connected to the device to be collected. When the number of the collecting cylinders B is two, the connecting port C2 is connected to one collecting connecting port B2 of the collecting cylinder B, and the connecting port C3 is connected to the other depressurizing connecting port B1 of the collecting cylinder B. Will be connected. Furthermore,
When the collecting-side cylinder B is only one connecting port B2 for collection, the connecting port C3 is not used.

Next, the refrigerant recovery operation of the refrigerant recovery apparatus 1 according to the present invention will be described with reference to FIGS. First, when the recovery-side cylinder B has two ports, first, the horizontal frame 6 of the refrigerant recovery device 1 is set in the horizontal direction, and the handle 12 is brought into contact with the ground surface as shown in FIG. In this state, a condensing unit H such as a refrigerator as a device to be recovered is connected to the connection port C1 via a rubber hose 61. The collecting cylinder B is placed on the weighing table 9, and the connection port B 1 is connected to the connection port C 2 by a rubber hose 62, and the connection port B 2 is connected to the connection port C 3 by a rubber hose 63. In addition, a chain 66 is attached to the collecting side cylinder B.
Is wound around the hooks 67 of the case 14 to prevent the case 14 from overturning.

Thereafter, the power supply of the refrigerant recovery device 1 is turned on. At this time, the control circuit 22 of the control unit 21 inspects the horizontal state of the main body 2 with the inclination detector 26, and permits the operation of the compressor 16 if it is within a predetermined range from the horizontal,
If the inclination is out of the predetermined range, the operation of the compressor 16 is prohibited. Accordingly, the operation of the compressor 16 is prohibited when the ground contact surface is inclined, or when the horizontal frame 6 is set up at the time of movement, and damage to the compressor 16 caused by operation in the inclined state is prevented. To prevent.

Next, the control circuit 22 first opens the solenoid valve SV4, equalizes the pressure difference between the discharge side and the suction side of the compressor 16, and reduces the starting load of the compressor 16. Then 3 ~
After 5 seconds have elapsed, the control circuit 22 closes the SV 4 and then starts the compressor 16 and the fan 17.

Here, when the operation mode for recovering the liquid refrigerant is selected, for example, by operating the switch 23, the control circuit 22 first closes the solenoid valve SV2 and opens the solenoid valves SV1 and SV3 as shown in FIG. As a result, the condensing unit H and the collecting cylinder B are communicated with each other via the strainer 42, the pipe 46, the solenoid valve SV1, and the check valve 39 (that is, the liquid refrigerant bypass circuit 45). The refrigerant in the liquid state in the condensing unit H due to the pressure difference between the refrigerant B and the connection port B of the collection-side cylinder B as shown by the dashed arrow and the thick line in FIG.
2 flows into the cylinder B as it is. The backflow to the main recovery circuit 55 is prevented by the check valve 41.

On the other hand, the operation of the compressor 16 causes the solenoid valve SV3 and the pressure reducing pipe 5 as shown by the solid arrow and the thick line in FIG.
6. The gas refrigerant in the recovery side cylinder B is sucked from the connection port B1 via the capillary tube 37, the pipe 48, the oil separator 34, the pipe 49, the accumulator 36, and the check valve 40. Therefore, the pressure in the recovery side cylinder B is low, thereby promoting the recovery of the liquid refrigerant. The gas refrigerant that has passed through the pressure reducing pipe 56 enters the pipe 48 via the capillary tube 37 (here, the liquid component contained in the refrigerant is decompressed and vaporized), and the heat exchanger 18, the oil separator 34, and the accumulator 3
6. After being sucked into the compressor 16 via the check valve 40 and compressed under pressure, it enters the pipe 52 via the oil separator 35.

The refrigerant that has entered the pipe 52 is air-cooled by the fan 17 in the heat exchanger 18, changed into a liquid refrigerant in the capillary tube 38 having a larger resistance value than the capillary tube 37, and then checked. Connection port B2 via valve 41
It is further collected in the collection side cylinder B.

Here, the fan 17 is operated and the
Although the outside air is sucked from 4 and circulated through the heat exchanger 18, the airflow by suction passes around the collection side cylinder B since the suction hole 24 faces the measuring table 9. Accordingly, a rise in the temperature of the collection side cylinder B is prevented, and a rise in the internal pressure is suppressed, so that the collection can be performed more quickly.

The recovery of the liquid refrigerant alone ends when the pressure in the recovery cylinder B and the pressure in the condensing unit H are balanced. Also, this point can be grasped by the change in weight of the collecting cylinder B by the weighing table 9. As described above, without passing through the compressor 16 at the beginning of the refrigerant recovery,
Since the liquid refrigerant in the condensing unit H is directly collected in the collecting cylinder B, the refrigerant can be quickly collected. Further, since the liquid refrigerant is recovered without being evaporated, it is possible to prevent a reduction in the recovery rate due to a decrease in the refrigerant temperature.

When the recovery of the liquid refrigerant is completed, the operation mode is switched to the gas refrigerant recovery operation mode by operating the switch 23, for example. Thereby, the control circuit 22 closes the solenoid valves SV1 and SV3 and opens the solenoid valve SV2. As a result, the gaseous refrigerant in the condensing unit H is supplied to the compressor 1 as shown by solid arrows and thick lines in FIG.
By the operation of 6, the compressor 16 is sucked into the compressor 16 via the pipe 47, the solenoid valve SV2, the capillary tube 37, the pipe 48, the oil separator 34, the pipe 49, the accumulator 36, and the check valve 40.

The gas refrigerant thus sucked enters the pipe 48 via the capillary tube 37 (here, the liquid component contained in the refrigerant is decompressed and vaporized), and then through the heat exchanger 18 as described above. It enters the oil separator 34. Since the gas refrigerant entering the pipe 48 is heated by the refrigerant passing through the pipe 52 in the heat exchanger 18, gasification of the refrigerant is promoted.

In the oil separator 34, oil contained in the refrigerant is separated, and only the gas refrigerant is sucked into the compressor 16 via the accumulator 36 and the check valve 40, pressurized, and then enters the oil separator 35. And
Here, the oil of the compressor 16 is separated, and thereafter, only the gas refrigerant enters the pipe 52.

The refrigerant that has entered the pipe 52 is likewise discharged from the heat exchanger 1
8, the air is condensed by air cooling by the fan 17 and the state is changed to liquid refrigerant by the capillary tube 38 having a large resistance value.
Will be collected. The backflow to the liquid refrigerant bypass circuit 45 is prevented by the check valve 39.

While the above description has been made of the case where two recovery-side cylinders B are used, the operation when one recovery-side cylinder B having only the recovery connection port B2 is used will be described below. In this case, the control circuit 22 keeps the solenoid valve SV3 closed in each operation mode as shown in FIG. Thus, the pressure reducing pipe 56 is ignored.

The other connections are the same as in the case of the two ports described above. In the operation mode for recovering the liquid refrigerant, the control circuit 22 opens the solenoid valve SV1 and closes the SV2 to open the solenoid valve in FIG.
The condensing unit H as shown by the dashed arrow and the bold line
The liquid refrigerant inside is recovered as it is. However, in this case, the pressure in the collection side cylinder B is not reduced.

When the operation mode is switched to the operation mode in which the gas refrigerant is recovered after the recovery of the liquid refrigerant, the control circuit 22 closes the solenoid valve SV1 and opens the SV2 to open the solenoid valve SV1 as shown by solid arrows and thick lines in FIG. The gas refrigerant in the condensing unit H is recovered by following the same procedure of refrigerant gasification, compression and liquefaction.

In each of the above-described embodiments, each operation mode is switched by operating the switch 23. However, the present invention is not limited to this. For example, the control circuit 22 detects a change in the weight of the collection-side cylinder B using the weighing table 9. Alternatively, a configuration may be adopted in which the end of the recovery of the liquid refrigerant is grasped, and the mode for automatically recovering the liquid refrigerant is switched to the mode for recovering the gas refrigerant.

In the embodiment, the operation mode for recovering the liquid refrigerant and the operation mode for recovering the gas refrigerant are switched. However, the present invention is not limited to this.
Can be used only for recovering the liquid refrigerant in the same manner as the flow shown in FIG. 8 or FIG. 10, and the liquid refrigerant in the refrigerant sucked from the connection port C1 can be used as in the flow shown in FIG. 9 or FIG. By gasifying with the capillary tube 37, it is possible to recover the gas refrigerant and the liquid refrigerant in a mixed state as in the related art.

Further, although the check valves 39 and 41 are used in the embodiment, the present invention is not limited to this, and a backflow may be prevented by using an electromagnetic valve.

[0051]

As described above in detail, according to the present invention, a liquid refrigerant bypass circuit is provided from the recovery-side connection port to the recovery-side connection port, and the liquid refrigerant bypass circuit is provided downstream of the branch point on the recovery-side connection port side. Since the first and second opening / closing valves are respectively provided in the main recovery circuit and the liquid refrigerant bypass circuit and the main recovery circuit in the former stage of the junction on the recovery side connection port side are provided with valves for preventing backflow, respectively. In the operation mode in which the first on-off valve is opened and the second on-off valve is closed, the liquid refrigerant in the device to be recovered can be directly recovered to the recovery container by the liquid refrigerant bypass circuit without passing through the compressor. Become.

Therefore, the conventional operation of once gasifying the liquid refrigerant and then condensing it by pressurizing and condensing it is eliminated.
The collection time can be shortened and the collection efficiency can be improved.

In particular, a pressure recovery pipe having a second recovery side connection port connected at one end to the pressure reduction connection port of the recovery container as in the third aspect of the present invention is provided at a stage subsequent to the second opening / closing valve in the main recovery circuit. If a third on-off valve is provided downstream of the second collection side connection port, two collection containers are provided, one of which is a collection connection port connecting to the collection side connection port, and the other is a collection connection port. An operation mode in which the first and third on-off valves are opened, the second on-off valve is closed, and the compressor is operated when the pressure-reducing port can be connected to the second recovery-side port. In the above, the liquid refrigerant in the device to be recovered can be recovered as it is by the liquid refrigerant bypass circuit while the pressure in the recovery container is reduced.

Therefore, the liquid refrigerant can be recovered more quickly. Since the pressure reducing pipe is provided with the third opening / closing valve, even if the collection container has only one port, the pressure reducing pipe can be ignored by closing and placing the third valve. The refrigerant can be recovered without any trouble by the liquid refrigerant bypass circuit and the main recovery circuit.

Further, a pressure reducing device is provided in the main recovery circuit at a stage after the branch point between the liquid refrigerant bypass circuit and the main recovery circuit and before the junction, and the main recovery circuit between these pressure reduction devices is provided. If the compressor is connected, the liquid component in the refrigerant sucked into the main recovery circuit is smoothly gasified, and is pressurized by the compressor without obstructing liquid recovery from the liquid refrigerant bypass circuit. The refrigerant can be liquefied smoothly.

Further, a starting load reducing bypass circuit for connecting the suction side and the discharging side of the compressor is provided, and a fourth opening / closing valve is provided in the starting load reducing bypass circuit. By opening the fourth on-off valve before starting the compressor, each on-off valve is closed when not in use to equalize the pressure on the suction side and the discharge side of the compressor in which the pressure difference is maintained, This can reduce the starting load of the compressor.

[Brief description of the drawings]

FIG. 1 is a perspective view of a refrigerant recovery device of the present invention.

FIG. 2 is a vertical sectional side view of the refrigerant recovery device of the present invention.

FIG. 3 is another vertical sectional side view of the refrigerant recovery device of the present invention.

FIG. 4 is a vertical sectional side view of the compressor.

FIG. 5 is a configuration diagram of a refrigerant recovery machine installed in the main body of the refrigerant recovery device of the present invention.

FIG. 6 is a diagram illustrating an installation state of the refrigerant recovery device of the present invention during a refrigerant recovery operation.

FIG. 7 is a diagram illustrating an open / close state of a solenoid valve in each operation mode of the refrigerant recovery device of the present invention.

FIG. 8 is a diagram illustrating the flow of the refrigerant in the refrigerant recovery device in an operation mode for recovering the liquid refrigerant when the recovery-side cylinder has two ports.

FIG. 9 is a diagram illustrating the flow of the refrigerant in the refrigerant recovery device in an operation mode for recovering the gas refrigerant when the number of recovery-side cylinders is two;

FIG. 10 is a diagram illustrating the flow of the refrigerant in the refrigerant recovery device in an operation mode for recovering the liquid refrigerant when the recovery-side cylinder has one port.

FIG. 11 is a diagram illustrating the flow of the refrigerant in the refrigerant recovery device in an operation mode for recovering the gas refrigerant when the recovery-side cylinder has one port.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Refrigerant recovery apparatus 3 Refrigerant recovery machine 16 Compressor 22 Control circuit 37, 38 Capillary tube (decompression device) 39, 41 Check valve 45 Liquid refrigerant bypass circuit 51 Piping (starting load reduction bypass circuit) 55 Main recovery circuit B Recovery Side cylinder (collection container) B1, B2 Connection port C1 to C3 Connection port H Condensing unit (collected device) SV1 to SV4 Solenoid valve (open / close valve)

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Tsuyoshi Kawaguchi 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (56) References JP-A-6-11216 (JP, A) JP JP-A-4-20761 (JP, A) JP-A-3-1522367 (JP, A) JP-A-4-165273 (JP, A) JP-A-50-38844 (JP, A) JP-A-3-73880 (JP) , U) (58) Field surveyed (Int. Cl. ⁷ , DB name) F25B 45/00

Claims (6)

(57) [Claims] 1. A compressor for pressurizing a refrigerant, a heat exchanger for condensing a refrigerant, and the like are sequentially connected between a connection port on a collection side connected to a recovery apparatus and a connection port on a collection side connected to a collection container. And a liquid refrigerant bypass circuit extending from the recovery-side connection port to the recovery-side connection port, and the liquid refrigerant bypass in a stage subsequent to the branch point on the recovery-side connection port side. The circuit and the main recovery circuit are provided with first and second on-off valves, respectively, and the liquid refrigerant bypass circuit and the main recovery circuit at a stage before the junction on the recovery side connection port side are for preventing backflow. A refrigerant recovery device provided with valves. 2. An operation mode in which a first on-off valve is opened, a second on-off valve is closed, and a liquid refrigerant in a device to be recovered is recovered by a liquid refrigerant bypass circuit, and the first on-off valve is closed, 2. The refrigerant recovery system according to claim 1, wherein the second on-off valve is opened, and the compressor is operated to switch an operation mode for recovering the gas refrigerant in the device to be recovered by the main recovery circuit. apparatus. 3. A pressure-reducing pipe provided at one end with a second recovery-side connection port connected to the pressure-reduction connection port of the recovery container, and connected to the main recovery circuit at a stage subsequent to the second on-off valve.
The refrigerant recovery device according to claim 1, wherein a third on-off valve is provided at a stage subsequent to the second recovery-side connection port. 4. The first and third on-off valves are opened, the second on-off valve is closed, and the compressor is operated to reduce the pressure in the collection container. An operation mode for recovering the liquid refrigerant, wherein the first and third on-off valves are closed, the second on-off valve is opened, and the gas refrigerant in the device to be recovered is operated by the main recovery circuit by operating the compressor. 4. The refrigerant recovery device according to claim 3, wherein an operation mode for recovering the refrigerant is switchable. 5. A decompression device is provided in each of the main recovery circuits at a stage after the branch point between the liquid refrigerant bypass circuit and the main recovery circuit and before the junction, and a compressor is connected to the main recovery circuit between these pressure reduction devices. The refrigerant recovery device according to claim 1, wherein: 6. A starting load reducing bypass circuit for connecting a suction side and a discharge side of a compressor, and a fourth opening / closing valve is provided in the starting load reducing bypass circuit. 1. A refrigerant recovery device.