JPH0420761A - Refrigerant recoverying machine - Google Patents

Abstract

PURPOSE:To perform an efficient recoverying action and improve an efficiency of recovering action by a method wherein a refrigerant recoverying machine is provided with a circulation pipe passage for guiding the refrigerant gas in a bomb into a pipe line between a recovered machine and a compressor and an automatic opening or closing means for automatically opening or closing the circulation pipeline. CONSTITUTION:As refrigerant gas in a bomb 11 is increased by more than a predeter mined pressure, a relief valve 13 releases a circulation pipeline 12, thereby the refriger ant gas in the bomb 11 can be fed into a pipe passage between a recovered machine A and a compressor 6, thereby a high pressure state of the bomb 11 can be prevented automatically and positively. Accordingly, a state in which the inner side of the bomb 11 becomes a high pressure and the refrigerant can not be recovered can be positively avoided, thereby an efficient recovery of the refrigerant gas can be carried out. In addition, since the circulation pipeline 12 feeds the refrigerant gas in the bomb 11 into a pipeline P1 between the evaporating pipeline 3 and the compressor 6, namely, the gas is fed directly into the pipeline P1 without passing through the evaporation pipeline 3, so that it is possible to prevent any over-heat of the compressor 6.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention provides
The present invention relates to a refrigerant recovery machine that recovers refrigerant and stores it in a cylinder.

<Prior Art> Conventionally, most of the fluorocarbon gases used as refrigerants in air conditioners and refrigerators were released into the atmosphere.

However, recent theories suggest that this fluorocarbon gas destroys the ozone layer, increasing the amount of ultraviolet rays that reach the earth from the sun, and promoting global warming (so-called fluorocarbon pollution). There is.

Therefore, in order to prevent the above-mentioned fluorocarbon pollution, there is an increasing demand for regulating the release of fluorocarbons into the atmosphere.
There is a demand for a refrigerant recovery machine that can recover refrigerant.

By the way, in this type of refrigerant recovery machine, the inside of the recovery cylinder is
Although it is saturated with refrigerant gas evaporated from the liquid refrigerant, if the internal pressure of the cylinder becomes higher than the condensation pressure, it will no longer be possible to fill the cylinder.

Therefore, it is necessary to remove high-pressure refrigerant gas from the cylinder as appropriate.

<Problems to be Solved by the Invention> Conventionally, the above-mentioned degassing has been carried out by manually opening a valve attached to a vibrator that communicates the cylinder with the atmosphere at predetermined intervals, and releasing the refrigerant gas in the cylinder into the atmosphere. This was done by releasing it.

However, this degassing operation, which is performed by manually opening the valve each time, is very time-consuming and troublesome. In addition, if you forget to vent the gas, high pressure builds up inside the cylinder, resulting in a situation where collection stops, making it impossible to perform efficient collection. Moreover, a portion of the refrigerant gas is not recovered and is released into the atmosphere, resulting in a problem of poor recovery efficiency. On the other hand, releasing refrigerant gas into the atmosphere by degassing as described above also affects the value of the refrigerant recovery machine from the viewpoint of pollution prevention.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a refrigerant recovery machine that can perform efficient recovery and has high recovery efficiency.

<Means for Solving the Problems> In order to solve the above problems, the refrigerant recovery machine of the present invention includes a compressor for compressing refrigerant gas, and a compressor for compressing refrigerant gas, in a pipe line leading from the machine to be recovered to a cylinder for liquid refrigerant recovery. In a refrigerant recovery machine equipped with a condensing pipe line that condenses and liquefies refrigerant gas from a compressor, a circulation pipe line that guides the refrigerant gas in the cylinder to a pipe line between the recovered machine and the compressor; The present invention is characterized by comprising an automatic opening/closing means for automatically opening and closing the conduit.

In addition, an evaporation pipe line is provided between the machine to be recovered and the compressor to evaporate the liquid refrigerant introduced from the machine to be recovered, and a circulation pipe line connects the inside of the cylinder between the evaporation pipe line and the compressor. It may also be connected to a conduit between the two.

Additionally, there is a bypass line that guides the refrigerant gas introduced from the machine to be recovered to a line between the evaporator line and the compressor, and a gas line that detects that the refrigerant gas introduced from the machine to be recovered is in a gas state. It is preferable that the device includes a detection means and an electromagnetic valve that opens the bypass line in response to gas detection by the gas detection means.

A stop valve is provided in which an opening/closing mechanism for opening/closing an introduction pipe for introducing liquid refrigerant from the condensing pipe into the cylinder and an opening/closing mechanism for opening/closing a circulation pipe are incorporated into a single casing. It is desirable if it is.

Function> According to the refrigerant recovery machine having the above configuration, the automatic opening/closing means opens the circulation pipe to transfer the refrigerant gas in the cylinder between the machine to be recovered and the compressor via the circulation pipe. It can be introduced into the pipe line between the cylinders, thereby automatically preventing high pressure inside the cylinder. Therefore, the situation where the pressure inside the cylinder becomes high and it becomes impossible to recover is avoided.
This can be reliably avoided, thereby allowing for efficient recovery. Furthermore, since the refrigerant gas is circulated within the pipe and not released into the atmosphere, recovery efficiency is also high.

In addition, when the circulation pipe connects the inside of the cylinder to the pipe between the evaporation pipe and the compressor, the circulation pipe
Since the evaporation pipe is bypassed, overheating of the compressor can be prevented. In other words, if relatively high-temperature refrigerant gas in a cylinder is passed through the evaporation pipe, there is a risk that the refrigerant gas will become overheated in the evaporation pipe and cause the compressor to overheat. It can be prevented. Note that the evaporation pipe can reduce the burden on the compressor by gasifying the liquid refrigerant introduced from the machine to be recovered and guiding it to the compressor.

Furthermore, if a bypass pipe, a gas detection means, and a solenoid valve are provided, when the gas detection means detects that the refrigerant introduced from the machine to be recovered is in a gas state, the gas detection means detects the gas. In response, a solenoid valve opens the bypass line, so that the refrigerant in gaseous state is introduced via the bypass line into the line between the evaporator line and the compressor. In other words, the gaseous relatively high temperature refrigerant is
Since it is introduced into the compressor while bypassing the evaporation pipe,
It is possible to prevent the high temperature refrigerant gas from becoming overheated in the evaporator line and causing the compressor to overheat.

If a stop/knob valve is provided that incorporates the opening/closing mechanism for the introduction pipe and the circulation pipe into a single casing, by sharing the casing,
The number of parts can be reduced and the structure can be simplified.

<Example> Embodiments will be described below based on the accompanying drawings showing examples.

FIG. 1 shows a schematic configuration of a refrigerant recovery machine as an embodiment of the present invention. A pressure reducing valve 1, an evaporation pipe line 3, an accumulator 4, a suction pressure regulating valve 5, a compressor 6, an oil separator 7, a condensing pipe line 9, and a dryer 1O are provided along the pipe line P leading thereto. The evaporation pipe line 3 and the condensation pipe line 9 are incorporated into the heat exchanger 2, and the upper part of the pump 11 is connected to the circulation pipe line PI between the evaporation pipe line 3 and the accumulator 4. communicated by. A relief valve 13 serving as an automatic opening/closing means for automatically opening and closing the circulation pipe 12 is disposed in the middle of the circulation pipe 12 .

The pressure reducing valve 1 is a constant pressure expansion valve that adjusts the flow rate of the refrigerant to the evaporation pipe 3 by reducing the pressure of the gas-liquid mixed refrigerant such as fluorocarbons sucked from the recovery machine A.

The evaporation pipe line 3 is made of a coiled pipe that gasifies liquid refrigerant among gas-liquid mixed refrigerant whose flow rate is adjusted by the pressure reducing valve l.

The accumulator 4 is a container that stores the refrigerant from the evaporation pipe line 3, and separates the refrigerant gas and liquid such as liquid refrigerant or refrigerating machine oil (lubricating oil) depending on the weight, and supplies the liquid to the compressor 6. This restricts the introduction of

The suction pressure regulating valve 5 connects the accumulator 4 to the compressor 6.
This valve prevents the electric motor for the compressor 6 from being overloaded due to a sudden increase in heat load by limiting the amount of refrigerant gas flowing into the compressor 6.

The compressor 6 includes a reciprocating, centrifugal, or rotary pump device that compresses refrigerant gas and sends it to the condensing pipe 9 side.

The oil separator 7 separates oil such as refrigerating machine oil from the refrigerant gas compressed and discharged from the compressor 6 and returns it to the compressor 6 side via a capillary 8 disposed in a return path 71 . Capillary 8 is
It is a capillary tube that functions similar to an expansion valve.

The condensing pipe line 9 is made of a coiled pipe that condenses and liquefies the refrigerant gas compressed and discharged from the compressor 6.

The dryer IO is a drying device that removes moisture from the saliva refrigerant introduced from the condensing pipe line 9.

The cylinder 11 is a pressure vessel that stores liquid refrigerant from which water has been removed by the dryer 10. The introduction pipe 17 opens into the inner bottom 11a of the cylinder 11 in order to introduce liquid refrigerant into the inner bottom 11a.

Referring to FIGS. 2 and 3, the heat exchanger 2 includes a plurality of fins 21 arranged in parallel and separated by a predetermined interval, through which the evaporating pipe line 3 and the condensing pipe line 9 made of the coiled pipes are inserted. and a blowing means 22 consisting of a fan that blows air onto the fins 21.
It is equipped with This heat exchanger 2 has both the role of an evaporator and a condenser. Note that the blowing means 22 blows air from the evaporation pipe line 3 toward the condensation pipe line 9. That is, the evaporation pipe line 3 is arranged on the upwind side of the condensation pipe line 9.

The circulation pipe 12 opens to the inner upper part 11b of the cylinder 11, and transfers the refrigerant gas accumulated in the inner upper part 11b of the cylinder 11 to the pipe P between the evaporation pipe 3 and the accumulator 4.
1, and a manual stop valve 19, a liquid detection device 35, and a relief valve 13 are disposed in the middle.

The manual stop valve 19 is a stop valve that is closed when the cylinder 11 is removed. The liquid detection device 35 is connected to the cylinder 11.
This is a sensor that detects the outflow of liquid refrigerant from the liquid refrigerant, and based on the detection signal from this liquid detection device 35, for example, the compressor 6 is stopped, refrigerant recovery from the recovery machine A is stopped, and the cylinder is stopped. This is to prevent overfilling of the tank 11.

The relief valve 13 is a pressure control valve that opens the circulation line 12 when the pressure on the cylinder 1 side exceeds a predetermined value, and closes the circulation line 12 when the pressure on the cylinder I side exceeds a predetermined value.

According to this embodiment, when the pressure inside the cylinder 1 is less than a predetermined value, the refrigerant from the recovered machine A is passed through the pressure reducing valve 1 and the evaporation pipe 3 to the accumulator 4, as shown by the solid line in FIG. has been introduced.

The temperature of the refrigerant immediately before being introduced into the evaporation pipe line 3 is approximately 0 to 5.
°C, but the refrigerant flowing through the evaporation pipe 3 is
The temperature of the refrigerant passing through the evaporation pipe 3 is set to a temperature of 5 to 10 °C. It is possible to increase it up to. Therefore, the liquid refrigerant can be reliably gasified, and the liquid refrigerant can be prevented from being introduced into the compressor 6 without being gasified, thereby preventing the compressor 6 from being destroyed by a so-called liquid hammer or the like. can be prevented.

When the pressure of the refrigerant gas in the cylinder 11 reaches a predetermined level or higher, the relief valve 13 opens the circulation line 12, thereby transferring the refrigerant gas in the cylinder 11 to the machine to be recovered via the circulation line 12. and the compressor 6 (indicated by a broken line in FIG. 1), thereby automatically and reliably preventing high pressure inside the cylinder 11. can. It is possible to reliably avoid a situation where the pressure inside the cylinder becomes high and recovery becomes impossible, thereby allowing efficient recovery. Furthermore, since the refrigerant gas is circulated within the pipe and not released into the atmosphere, recovery efficiency is also high.

Moreover, the circulation pipe 12 allows the refrigerant gas in the cylinder 11 to
Since it is led to the pipe P1 between the evaporation pipe 3 and the compressor 6, that is, it is led directly to the pipe P1 without passing through the evaporation pipe 3, overheating of the compressor 6 can be prevented. That is, if relatively high-temperature refrigerant gas in the cylinder 11 passes through the evaporator line 3, the refrigerant gas that has been superheated in the evaporator line 3 will be introduced into the compressor 6, causing the compressor 6 to overheat. However, this can be prevented.

4 to 7 show other embodiments. The differences between this embodiment and the embodiment shown in FIG. 1 will be described below.

Referring to FIG. 4, from the recovered machine A to the accumulator 4
At the branch part 40, the pipes leading to the main pipe P3 are connected to the main pipe P3 which passes through the pressure reducing valve 1 and the evaporation pipe 3, and the bypass pipe 16a which leads directly to the accumulator 4 without going through the pressure reducing valve 1 and the evaporation pipe 3. It is branched into.

A gas detection means 15 for detecting that the refrigerant introduced from the machine A to be recovered is in a gaseous state is arranged downstream of the pressure reducing valve 1. This gas detection means 15 is a pressure sensor that detects that the refrigerant is in a gas state when the pressure becomes below a predetermined value. This is because the pressure after pressure reduction by the pressure reducing valve 1 is lower for refrigerant gas than for liquid refrigerant. Further, in response to gas detection by the gas detection means 15, the bypass pipe 16a is connected to a bypass pipe! A solenoid valve 16b for opening 6a is provided.

The circulation pipe 12 is open to the inner upper part 11b of the cylinder 11, and its middle part communicates with the branch part 40, and the part of the circulation pipe 12 from the branch part 40 to the accumulator 4 is , are also served by the bypass conduit 16a.

The automatic opening/closing means 13 is a solenoid valve 1 arranged in the circulation pipe 12.
3a, and a timer means 13b for intermittently opening this solenoid valve 13a.

A solenoid valve 32 is disposed between the recovered machine A and the branch section 40, and this solenoid valve 32 is closed when the solenoid valve 13a is opened by the timer means 13b.

Referring to FIGS. 7 and 8, an opening/closing mechanism 18b1 opens and closes the introduction pipe 17 for discharging liquid refrigerant from the condensing pipe 9 into the cylinder 1, and an opening/closing mechanism 1 opens and closes the circulation pipe 12.
The cylinder 11 is provided with a stop valve 18 in which the stop valve 8c is assembled into a single casing 18a.

Since the other parts are the same as those in the embodiment shown in FIG. 1, the same reference numerals are given to the drawings and explanations thereof will be omitted.

According to this embodiment, referring to FIG. 4, if a predetermined period of time has elapsed since the start of recovery and gas is not detected by the gas detection means 15, the recovered machine A The refrigerant is introduced into the accumulator 4 via the pressure reducing valve 1 and the evaporator line 3, and as in the embodiment shown in FIG. It is possible to prevent the compressor 6 from being damaged by a liquid hammer or the like due to the introduction of refrigerant into the compressor 6.

Referring to FIG. 5, when a predetermined period of time has elapsed after the start of collection, the timer means 13b opens the solenoid valve 13a and closes the solenoid valve 32. Solenoid valve 3
2, the refrigerant from the recovered machine A is cut off, while the refrigerant gas in the cylinder 11 reaches the branch part 40 via the circulation pipe 12 by opening the solenoid valve 3a.

After this refrigerant gas is depressurized by the pressure reducing valve 1 of the main pipe P3, it reaches the gas detection means 15.
5, it is detected that the refrigerant is in a gas state.

Depending on this gas detection, the solenoid valve 16b or the bypass pipe 1
6a is opened, the refrigerant gas in the cylinder 1 bypasses the pressure reducing valve 1 and the evaporation pipe 3 and is guided to the accumulator 4.

In this way, the refrigerant gas in the cylinder 11 is periodically removed, so that the pressure inside the cylinder 11 does not become high, and therefore, high pressure inside the cylinder 11 is automatically and reliably prevented. As a result, as in the embodiment shown in FIG. 11, efficient collection can be performed and the collection efficiency is high. However, since the circulation pipe 12 leads the refrigerant gas in the cylinder 1 directly to the accumulator 4 without passing through the evaporation pipe 3, overheating of the compressor 6 can be prevented.

Further, with reference to FIG. 6, when gaseous refrigerant gas is introduced from the machine A to be recovered, this is detected by the gas detection means 15, and the solenoid valve 16b causes the bypass pipe 16 to
a is released. Thereby, the gaseous refrigerant is introduced into the accumulator 4 through the branch portion 4o and the bypass pipe line 16a. Therefore, by allowing the gaseous and relatively high temperature refrigerant to bypass the evaporation pipe line 3, overheating of the compressor 6 can be prevented. Note that although the circulation pipe 12 and the bypass pipe 16a also bypass the pressure reducing valve 1, the refrigerant gas guided by the circulation pipe 12 and the bypass pipe 16a can be depressurized by the suction pressure regulating valve 5. I can do it.

Furthermore, the stop valve 18 is configured to open and close the introduction pipe 17 through the opening/closing mechanism 1 .
8b and the opening/closing mechanism 18C for the circulation pipe 12 are incorporated into a single casing 18a, so that the casing 18a
By sharing the parts, the number of parts can be reduced and manufacturing costs can be reduced.

Note that this invention is not limited to the above embodiments, and various design changes may be made without changing the gist of the invention, such as providing the circulation pipe 12 and the bypass pipe 16a in separate routes. be able to.

<Effects of the Invention> According to the present invention, the automatic opening/closing means opens the circulation line to transfer the refrigerant gas in the cylinder to the pipe between the machine to be recovered and the compressor via the circulation line. This can automatically and reliably prevent high pressure from building up inside the cylinder. Therefore, it is possible to reliably avoid a situation where the pressure inside the cylinder becomes high and recovery becomes impossible, and thereby efficient recovery can be performed. Furthermore, since the refrigerant gas is circulated within the pipe and not released into the atmosphere, recovery efficiency is also high.

In addition, when the circulation pipe communicates the inside of the cylinder with the pipe between the evaporation pipe and the compressor stop, the circulation pipe
Since the evaporation pipe is bypassed, overheating of the compressor due to overheating of the refrigerant gas can be prevented. Moreover, the evaporation pipe gasifies the liquid refrigerant introduced from the recovered machine and guides it to the compressor, which reduces the load on the compressor and prevents damage to the compressor caused by liquid hammer, etc. be able to.

Furthermore, if a bypass line, gas detection means, and electromagnetic valve are provided, the gaseous relatively high-temperature refrigerant is introduced into the compressor while bypassing the evaporation line, so the high-temperature refrigerant It is possible to prevent the gas from becoming overheated in the evaporator line and causing overheating of the compressor.

If a stop valve is provided in which the inlet pipe opening/closing mechanism and the circulation pipe opening/closing mechanism are incorporated into a single casing, the number of parts can be reduced by sharing the casing. The structure can be simplified and manufacturing costs can be reduced.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram of a refrigerant recovery machine as an embodiment of the present invention, Figs. 2 and 3 are a side view and a perspective view of a heat exchanger, respectively, and Figs. 4 to 6 show other embodiments. A schematic configuration diagram of an example refrigerant recovery machine, and FIGS. 7 and 8 are cross-sectional views showing a stop valve. A...Recovery machine, 2...Heat exchanger, 6...Compressor, 9...Condensing pipe line, 11...Cylinder, 12...Circulation pipe line, 13...Automatic Opening/closing means, 15... Gas detection means, 16a... Bypass pipe line, 16b... Solenoid valve, 18... Stop valve, 18a... Casing, 18b, 18c... Opening/closing mechanism. 3... Evaporation pipe line,

Claims (4)

[Claims] 1. Cylinder (11) for recovering liquid refrigerant from the machine to be recovered (A)
In the refrigerant recovery machine, the refrigerant recovery machine is equipped with a compressor (6) for compressing refrigerant gas, and a condensation pipe (9) for condensing and liquefying the refrigerant gas from the compressor (6), in a pipe leading to the cylinder (1).
A circulation pipe (12) that guides the refrigerant gas in 1) to a pipe between the recovered machine (A) and the compressor (6);
12) and automatic opening/closing means (13) for automatically opening and closing the refrigerant recovery machine. 2. Between the machine to be recovered (A) and the compressor (6), there is an evaporation pipe line (3) for evaporating the liquid refrigerant introduced from the machine to be recovered (A).
), and the circulation pipe (12) connects to the cylinder (11).
The refrigerant recovery machine according to claim 1, wherein the inside of the refrigerant recovery machine is connected to a pipe line between the evaporation pipe line (12) and the compressor (6). 3. The refrigerant gas introduced from the machine to be recovered (A) is introduced from the machine to be recovered (A) and the bypass pipe (16a) that leads the refrigerant gas introduced from the machine to be recovered (A) to the pipeline between the evaporation pipe (3) and the compressor (6). a gas detection means (15) for detecting that the refrigerant is in a gas state; and in response to gas detection by the gas detection means (15),
The refrigerant recovery machine according to claim 1 or 2, further comprising a solenoid valve (16b) for opening the bypass pipe (16a). 4. An opening/closing mechanism (18b) that opens and closes the introduction pipe (17) that introduces the liquid refrigerant from the condensation pipe (9) into the cylinder (11).
), and an opening/closing mechanism (18c) that opens and closes the circulation pipe (12).
4. Refrigerant recovery machine according to claim 1, 2 or 3, characterized in that a stop valve (18) is provided, in which a stop valve (18) is incorporated in a single casing (18a).