JP2008275273A - Refrigerant recovery device and refrigerant recovery unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an excellent refrigerant recovery unit capable of preventing mixing of a dissimilar refrigerant, by remarkably improving durability in a dry compressor, by using only a very small quantity of oil, when recovering refrigerant gas. <P>SOLUTION: This refrigerant recovery device has an oil separator for separating the oil from the refrigerant gas including oil of a refrigerant recovery object apparatus, the dry compressor being a motive power source of the device, a condenser using the separated refrigerant gas as a liquid refrigerant, and a refrigerant recovery vessel for storing the separated liquid refrigerant, and has an oil supply means for spraying the oil in the dry compressor in a passage reaching the dry compressor from the oil separator. The refrigerant recovery device characterized by arranging a pressure regulating valve up to the oil supply means from the oil separator, is used as a solving means. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention, for example, collects refrigerant gas from a home cooler, air conditioner, refrigerator, automobile cooler, etc. (hereinafter referred to as “refrigerant collection device”) without releasing it into the atmosphere, and collects it as necessary. Regarding the refrigerant recovery device and the refrigerant recovery unit for sending the subsequent refrigerant to the refrigerant recovery device, in particular, improving the durability of the dry compressor in the refrigerant recovery device and the dry compressor that is the installation target of the refrigerant recovery unit, The present invention relates to a refrigerant recovery device and a refrigerant recovery unit that improve the recovery rate and recovery speed of refrigerant gas. The refrigerant recovery unit is a part of the refrigerant recovery device and functions as a refrigerant recovery device in combination with other known devices (for example, an oil separator, a compressor, etc.).

  Conventionally, means for recovering the refrigerant gas of the refrigerant recovery device Z1 includes, for example, a compressor Z2, a condenser Z3, a refrigerant recovery container Z4, a pressure detection means Z5, a valve Z6, a filter Z7, etc. as shown in FIG. The refrigerant recovery device Z is known. In general, a refrigerant recovery apparatus needs to be operated continuously for a long time to recover a large amount of refrigerant, and improvement in the recovery processing speed and improvement in recovery processing efficiency are always required.

  However, in general, the compressor Z2 tends to have a difference in operation efficiency depending on the use environment or the like. For example, in a situation where the outside air temperature is high, such as in summer, when ventilation is insufficient or the refrigerant recovery device Z is exposed to direct sunlight, the temperature in the refrigerant recovery device Z is 60 ° C. to 70 ° C. As a result, the pressure in the refrigerant recovery container Z4 increases in proportion to the temperature, and a load is applied to the compressor Z2. The load on the compressor Z2 causes a disadvantage that the refrigerant recovery efficiency decreases and the refrigerant recovery time becomes longer.

  Further, since the temperature of the refrigerant recovery device Z1 is low in winter, when the liquid refrigerant is evaporated and recovered from the refrigerant recovery device Z1, heat is taken away as the heat of vaporization as the refrigerant evaporates. The temperature and pressure in the device Z1 decrease, and the refrigerant in the refrigerant recovery device Z1 is frozen while the refrigerant recovery is continued. Under such circumstances, since the recovery does not proceed when the refrigerant freezes, so-called double pulling is performed in which the recovery is performed again after a time for thawing the refrigerant. However, there is a disadvantage that the refrigerant recovery time becomes long.

  On the other hand, in general, there are an oil compressor and a dry compressor, both of which can be used in the refrigerant recovery apparatus. The oil compressor has an oil pan at the bottom, stores lubricating oil in the oil pan, and has a function of suppressing wear using the lubricating oil when a mechanism such as a compression piston is operated. The dry compressor includes a synthetic resin seal member having wear resistance on the periphery of the piston without using oil.

  In addition, as an industry that performs refrigerant recovery processing, for example, in the automobile-related industry, the refrigerant gas R12 and R134a are used as the refrigerant gas of the air conditioner (refrigerant recovery equipment). R22, R407, and other gases are used. The refrigerant recovery device recovers these refrigerant gases, but it is stipulated by law that these different types of chlorofluorocarbon gases should not be mixed.

  Here, the oil compressor requires lubricating oil when the mechanism is in operation, and the sucked refrigerant gas is mixed with the lubricating oil stored in the oil compressor. Therefore, for example, when different refrigerant gases are used in the same refrigerant recovery device (or refrigerant recovery system), for example, the refrigerant recovery processing of R134a is performed after the refrigerant recovery processing of R12, the dissimilar fluorocarbon gas in the oil compressor is used. Invite mixing easily. In order to avoid the mixing of different types of chlorofluorocarbon gas, the chlorofluorocarbon gas in the oil compressor must be released to the atmosphere, which is extremely problematic from the viewpoint of complying with the above laws and regulations.

On the other hand, since the dry compressor does not have lubricating oil, it does not cause the problem related to the mixing of the different kinds of refrigerant gases. However, since the lubricating oil is not used, there is a disadvantage that durability is low. However, regardless of whether an oil compressor or a dry compressor is used, the refrigerant gas immediately after being taken out from the refrigerant recovery apparatus is a mixture in which oil particles are mixed.
As a result of the trace amount of oil contained in the refrigerant gas, the above-mentioned disadvantage that the dry compressor is consumed quickly is somewhat suppressed by the lubricating action of the trace amount of oil contained in the refrigerant gas, which improves the durability of the dry compressor. Contributed.

  In order to separate the oil and the refrigerant, an oil separator is generally provided in the refrigerant recovery apparatus.

  As a refrigerant recovery device using an oil compressor and an oil separator, there is an apparatus having a configuration in which the removed oil is returned to the compressor and the oil is circulated. For example, the suction side for separating and removing the refrigeration oil in the refrigerant gas An oil separator, a compressor (compressor) that compresses refrigerant gas that has passed through the suction-side oil separator, a discharge-side oil separator that separates and removes refrigeration oil in the refrigerant gas discharged from the compressor, and the discharge side A condenser for condensing and liquefying the refrigerant gas exiting the oil separator; and a recovery cylinder (refrigerant recovery container) for storing the refrigerant liquid liquefied by the condenser, wherein the refrigerant in the refrigeration cycle is recovered. A dryer filled with an adsorbent is placed between the condenser and the recovery cylinder (refrigerant recovery container). The refrigerant recovery apparatus according to symptoms (e.g., see Patent Document 1.) It is known.

  Note that the refrigerant recovery apparatus according to Patent Document 1 includes means for circulating oil obtained by separation at the discharge-side oil separator to the oil compressor in order to supplement the circulating oil of the oil compressor.

Japanese Utility Model Publication No. 3-48676

In recent years, the performance of oil separators has been improved, and the separation of refrigerant and oil has been performed with higher accuracy.With regard to the recovery of refrigerant gas, the amount of oil that could not be separated by the oil separator is introduced into the dry compressor, It is further reduced. Although it is preferable that the amount of oil mixed with the refrigerant gas is reduced, the decrease in the durability of the dry compressor is more conspicuous. Specifically, there are some situations where the compressor must be replaced in about two to three months.
Further, as described above, it is necessary to improve the recovery processing speed of the refrigerant recovery device. Therefore, it is necessary to improve the recovery processing speed depending on how efficiently the operation of the compressor is performed.

  The present invention has been made in view of the above circumstances, and on the premise that a dry compressor is used or can be used together with a dry compressor when recovering the refrigerant gas, a different type of refrigerant that is impossible with a conventional oil compressor. The invention provides a refrigerant recovery device and a refrigerant recovery unit that drastically improve the durability of the dry compressor without impairing the advantages of the dry compressor, and further improve the refrigerant processing speed and processing efficiency. Is a problem to be solved.

  The present invention includes an oil separator that separates the oil from the refrigerant gas containing the oil in the refrigerant recovery apparatus, a dry compressor that is a power source of the apparatus, a condenser that uses the separated refrigerant gas as a liquid refrigerant, and a post-separation In the refrigerant recovery apparatus including the refrigerant recovery container for storing the liquid refrigerant, an oil supply means for spraying oil into the dry compressor is provided in a passage from the oil separator to the dry compressor, and the space between the oil separator and the oil supply means. Furthermore, a refrigerant recovery apparatus provided with a pressure regulating valve is used as means for solving the problem.

  The present invention also provides an oil separator that separates the oil from the refrigerant gas containing the oil of the refrigerant recovery apparatus, a connecting means for the dry compressor, a condenser that uses the separated refrigerant gas as a liquid refrigerant, and a liquid after separation. In the refrigerant recovery unit including a refrigerant recovery container for storing the refrigerant, an oil supply means for spraying oil into the dry compressor is provided in the connecting means for the dry compressor, which is a passage from the oil separator to the dry compressor, and the oil separator A refrigerant recovery unit provided with a pressure regulating valve between the oil supply means and the oil supply means is a means for solving the problem.

  Furthermore, the present invention stores a passage for collecting refrigerant gas containing oil from the refrigerant collection device, a dry compressor connected to the passage, a condenser using the refrigerant gas as a liquid refrigerant, and storing the separated liquid refrigerant. In the refrigerant recovery apparatus and refrigerant recovery unit including the refrigerant recovery container, the pressure recovery valve and the oil supply means are provided in the passage. Means for this.

  Further, the present invention stores a passage for collecting refrigerant gas containing oil from the refrigerant collecting device, a connecting means for the dry compressor, a condenser using the separated refrigerant gas as a liquid refrigerant, and the separated liquid refrigerant. In the refrigerant recovery unit including the refrigerant recovery container, the refrigerant recovery unit including the pressure adjusting valve and the oil supply means in the passage is a means for solving the problem.

  Furthermore, the present invention provides a means for solving the above-described problem in that the refrigerant recovery device or the refrigerant recovery unit includes an oil supply passage for supplying oil separated by an oil separator as lubricating oil to an oil feeder. And

  Further, the present invention comprises a pressure detection means for detecting a set pressure in the oil separator and a control device for controlling the supply of oil for the configuration including the oil supply passage, and the control device includes: Refrigerant recovery apparatus and refrigerant for receiving a set pressure detection signal, outputting a command signal for switching the oil recovery passage from the passage G to the oil supply passage F to the valve, and supplying oil to the lubricator by suction of the dry compressor The recovery unit is a means for solving the problem.

  The present invention includes a refrigerant supply passage extending from a refrigerant recovery container to a refrigerant recovery apparatus, and uses a pressure difference between the refrigerant recovery container and the refrigerant recovery apparatus to generate a high-pressure refrigerant gas in the refrigerant recovery container. The refrigerant recovery device that discharges the liquid refrigerant in the refrigerant recovery apparatus and the refrigerant recovery unit are used as means for solving the problem.

An oil separator that separates the oil from the refrigerant gas containing the oil in the refrigerant recovery device, a dry compressor that serves as a power source for the apparatus, a condenser that uses the separated refrigerant gas as a liquid refrigerant, and a liquid refrigerant that has been separated is stored. In the refrigerant recovery apparatus comprising the refrigerant recovery container, the passage from the oil separator to the dry compressor is provided with an oil supply means for spraying oil into the dry compressor, and between the oil separator and the oil supply means, A pressure regulating valve is provided to keep the dry compressor constant at the optimum pressure that maximizes the recovery capacity, and by controlling the supply amount, the oil supply means uses the refrigerant gas flow to supply oil in the form of a mist. By supplying a small amount of oil, the consumption of the dry compressor can be reduced and the durability can be improved.

  According to the invention of claim 2, the oil separator that separates the oil from the refrigerant gas containing the oil of the refrigerant recovery device, the connecting means for the dry compressor, and the condenser that uses the separated refrigerant gas as the liquid refrigerant And a refrigerant recovery unit comprising a refrigerant recovery container for storing the separated liquid refrigerant, and supplying oil for spraying oil into the dry compressor to a connecting means for the dry compressor, which is a passage from the oil separator to the dry compressor And the invention according to claim 1 with respect to the existing dry compressor by connecting to an existing dry compressor by providing a pressure regulating valve between the oil separator and the oil supply means. Similarly, the supply amount is controlled by the pressure adjustment valve, and the refrigerant gas flow is used. Yl in supply means to supply the oil to the spray shape, and reduce the consumption of dry compressor with little oil supply amount, thereby improving the durability.

  According to the invention according to claim 3 and the invention according to claim 9, the passage for collecting the refrigerant gas containing oil from the refrigerant collection device, the dry compressor connected to the passage, and the separated refrigerant gas into the liquid refrigerant A refrigerant recovery apparatus comprising a condenser and a refrigerant recovery container for storing the separated liquid refrigerant, wherein the passage includes a pressure regulating valve and an oil supply means. By adopting the unit, the refrigerant recovery unit and the refrigerant recovery unit not provided with the oil separator are always supplied in a state where the refrigerant is vaporized (that is, refrigerant gas), and the pressure adjustment valve is used to recover the dry compressor. By maintaining the optimum pressure at which the capacity is most effective and controlling the supply amount, the oil supply means uses the flow of refrigerant gas (oil) in the form of a mist Supply and to reduce the consumption of dry compressor with little oil supply amount, thereby improving the durability.

  According to the invention of claim 4, the passage for collecting the refrigerant gas containing oil from the refrigerant collection device, the connecting means for the dry compressor, the condenser using the separated refrigerant gas as the liquid refrigerant, and the separated liquid A refrigerant recovery unit comprising a refrigerant recovery container for storing refrigerant and having a pressure adjusting valve and an oil supply means in the passage is connected to an existing dry compressor not provided with an oil separator. By using the flow of refrigerant gas (gas), oil is supplied in the form of a mist by the oil supply means, and the supply amount is controlled by the pressure regulating valve, so that the dry compressor can be consumed with a small amount of oil supply. It can reduce and improve durability.

  According to the fifth and sixth aspects of the invention, in addition to the configuration of the refrigerant recovery apparatus according to the first or third aspect and the refrigerant recovery unit according to the second or fourth aspect, the refrigerant is separated by the oil separator. The oil supply pipe for supplying the oil to the refueling device as lubricating oil eliminates the need to manually supply the lubricating oil to the refueling machine and enables effective use of the oil separated from the refrigerant. Moreover, it can be set as the refrigerant | coolant collection | recovery apparatus or refrigerant | coolant collection | recovery unit excellent in economical efficiency and efficiency.

  According to the inventions according to claims 7 and 8, in addition to the configuration according to the inventions according to claims 5 and 6, the pressure detection means for detecting the set pressure in the oil separator, and the control device for controlling the supply of oil The control device receives a detection signal of the set pressure from the pressure detection means, outputs a command signal for switching the oil recovery passage from the passage G to the oil supply passage F to the valve, and sucks the dry compressor. Since the lubricator is provided with a structure for supplying oil, in addition to being able to obtain the effects of the present invention, it is possible to supply lubricating oil without manual operation, improving operational stability and saving labor. Can be combined.

  According to the inventions according to claims 10 and 11, in addition to the configuration of the present invention described above, the refrigerant supply container that has become a high pressure by including the refrigerant supply passage from the refrigerant recovery container to the refrigerant recovery device, Compared to this, the pressure difference with the refrigerant recovery device that is at a low pressure is used to push-pull the refrigerant gas in the refrigerant recovery container to the refrigerant recovery device at a high pressure, and the liquid in the refrigerant recovery device Since the configuration for discharging the refrigerant is added, the durability of the dry compressor is ensured by the present invention, the generation of heat of vaporization in the refrigerant collection apparatus is prevented, and the pressure in the refrigerant collection apparatus is reduced. By maintaining the high pressure, the refrigerant recovery processing efficiency and the refrigerant recovery processing speed can be dramatically increased.

  The present invention includes an oil supply means for spraying oil into the dry compressor in a passage from the oil separator to the dry compressor, and a pressure adjusting valve is provided between the oil separator and the oil supply means, and the oil separator separates the oil supply means. By supplying the oil supply pipe for supplying the oil as lubrication oil to the oil feeder, the oil supply means uses the flow of refrigerant gas vaporized by the oil separator to supply the oil as a mist into the dry compressor By reducing the consumption of the dry compressor with a small amount of oil supply, the durability was improved, and the supply amount was controlled with a pressure regulating valve, thereby realizing an economical and efficient refrigerant recovery device. .

  1 is a piping diagram of a refrigerant recovery apparatus according to Embodiment 1 of the present invention, FIG. 2 is a piping diagram of a refrigerant recovery unit U1 according to Embodiment 1 of the present invention, and FIG. 3 is a refrigerant recovery according to Embodiment 1 of the present invention. FIG. 4 is a piping diagram of the refrigerant recovery unit U3 according to the first embodiment of the present invention. FIG. 5 is a reference diagram illustrating an oil separator used in the refrigerant recovery device according to the first embodiment of the present invention. 6 to FIG. 9 are piping diagrams showing configurations in which the oil supply pipes are provided corresponding to the configurations of the refrigerant recovery units U1, U2, U3, and U4 shown in the first embodiment of the present invention in the configuration of the second embodiment. FIG. 10 is a piping diagram showing a refrigerant recovery apparatus configured to directly introduce refrigerant gas from the refrigerant recovery equipment R to the dry compressor without using an oil separator.

Example 1
As shown in FIG. 1, the refrigerant recovery apparatus M according to the first embodiment of the present invention is used by being connected to a cooler unit of a vehicle serving as the refrigerant recovery equipment R. Liquid refrigerant mixed with oil is stored in the cooler unit of the vehicle. The main components are an oil separator 1 for storing the liquid refrigerant after separation, an oil receiver 8, an oil separator 1 for separating the oil from the refrigerant containing oil in the cooler unit, and vaporizing the refrigerant, and the power of the apparatus A dry compressor 2 as a source, a condenser 6 for liquefying refrigerant gas, and the like. These configurations are common to general refrigerant recovery devices. The refrigerant recovery process using the refrigerant recovery device M in the first embodiment includes a recovery step of recovering the refrigerant mixed with oil from the cooler unit, a separation step of separating the refrigerant and oil in the refrigerant recovery device after recovery, And a transfer step of storing the refrigerant in the refrigerant recovery container 5 and further transferring the refrigerant stored in the refrigerant recovery container 5 to the cooler unit.

  The characteristic configuration of the refrigerant recovery apparatus M according to the present invention is that the pressure regulating valve 3 and the lubricator 4 are combined and connected to the suction side connection portion 20 side of the dry compressor 2. Each configuration will be specifically described below.

  The oil separator 1 used in Example 1 has substantially the same configuration as the oil separator according to Patent Document 1 previously filed by the present applicant. As shown in FIG. The oil is separated from the refrigerant containing the oil of the refrigerant recovery equipment R) and recovered as a liquid refrigerant in the refrigerant recovery container 5 by the condenser 6, and used for a refrigerant recovery and filling device that fills the cooler unit with the liquid refrigerant. This is a refrigerant recovery and filling oil separator 1 that separates oil and liquid refrigerant by heating means.

  The oil separator 1 has a vaporizing chamber 140 for vaporization in which the upper and lower ends of the hollow body portion 14 are closed by a top end plate 150 and a bottom end plate 151 as a main body, and is located at the lower part of the top end plate 150 and has an inner periphery and a top end plate. 150, a space is provided between the central pipe 154 and the central pipe 154 becomes a part of the liquid refrigerant recovery path, and the outer pipe 153 is continuously exchanged with the path A2 for recovering the refrigerant to be recovered when the refrigerant is recovered. The double pipe 152 for use is formed in a vaporization chamber 140 in a spiral shape around the longitudinal center so as not to cause accumulation, and the upper end of the outer pipe 153 in the double pipe 152 for heat exchange is A floating valve 156 that closes the upper end of the outer pipe 153 and through which the central pipe 154 passes is provided. The floating valve 156 includes a valve body that can open and close the upper end of the outer pipe 153, a valve receiving member that receives the valve body, A weight provided on the valve body, It opens the upper end of the outer tube 153 by the rise of the valve body.

  The bottom end plate 151 of the evaporation vaporizing chamber 140 of the oil separator 1 communicates with a passage A2 where one end branches to a passage A1 that is connected to the cooler unit and a passage G to the oil drain, and the other end. Opens into the evaporation vaporization chamber 140 as an inlet for both oil discharge and refrigerant inflow, and flows into either the inlet B or the passage B including the outer pipe 153 of the heat exchange double pipe 152. The first connection part 10 (low-pressure inflow side during refrigerant recovery) having a switching function valve that changes the flow rate and the lower part of the center pipe 154 of the heat exchange double pipe 152 serve as an outlet for liquid refrigerant. Four connecting portions 13 (high-pressure outflow side during refrigerant recovery) are provided, and a bottom heater 155 for heating the evaporation vaporizing chamber 140 and a bottom temperature adjusting means are provided on the bottom surface of the bottom end plate 151.

  Further, the upper part of the evaporation vaporizing chamber 140 of the oil separator 1 or the top end plate 150 can be selectively changed in one direction with one end opened inside the evaporation vaporizing chamber 140 and the other end in two directions. A second connecting portion 11 (a low pressure outflow side when collecting the refrigerant) having one open / close valve, one end being piped on the upper part of the central tube 154 of the heat exchanging double tube 152, and the other end having a two-way flow passage. The third connecting portion 12 (the high pressure inflow side during refrigerant recovery) is provided.

  Further, an upper level sensor 141 and a lower level sensor 142 for detecting the oil level are provided in the evaporation chamber 140 of the oil separator 1.

  The first connection part 10 of the oil separator 1 is connected to the lower part of the heat exchange double pipe 152. The heat exchange double pipe 152 becomes a part of the passage D in which the central pipe 154 collects the liquid refrigerant. The outer tube 153 continues to a passage A2 described later for collecting the refrigerant to be collected at the time of refrigerant collection.

As shown in FIG. 1, the connection part R1 on the high pressure outlet side of the cooler unit of the vehicle that becomes the refrigerant recovery equipment R and the first connection part 10 on the bottom surface of the oil separator 1 are connected by passages A1 and A2. is there.
A passage B connects the second connection portion 11 on the upper surface of the oil separator 1 to the suction side connection portion 20 (low pressure side) of the dry compressor 2. In the passage B, a pressure regulating valve 3 and an oil feeder 4 as oil supply means are provided in order from the side closer to the oil separator 1.

  The discharge-side connection portion 21 (high-pressure side) of the dry compressor 2 and the third connection portion 12 of the oil separator 1 are connected by a passage C. A condenser 6 is provided in the passage C. Further, the fourth connection portion 13 of the oil separator 1 and the refrigerant recovery container 5 are connected by a recovery passage D. The refrigerant recovery container 5 and the cooler unit are connected by a recovery passage E. A fourth valve V4 is provided on the recovery passage D side of the refrigerant recovery container 5, and a fifth valve V5 is provided on the recovery passage E side of the refrigerant recovery container 5.

  The passages A1 and A2 are connected to a passage G that transports oil to the oil receiver. A first valve V1 is provided in the passage A1. The passage G is provided with a second valve V2. By opening the first valve V1 and closing the second valve V2, a path for opening the passages A1, A2 from the cooler unit to the oil separator 1 can be selected, and by closing the first valve V1 and opening the second valve V2, A path for stopping the supply of the refrigerant from the cooler unit and transferring the oil in the oil separator 1 to the oil receiving portion 8 can be selected. Further, a filter 7 is provided in the passage A1, and the filter 7 can remove dust and foreign matters mixed in the liquid refrigerant. Further, a first sensor S1 (pressure detection means) for detecting pressure is provided between the filter in the passage A1 and the first valve V1. Further, a pressure detection means S2 for detecting the pressure in the oil separator 1 is provided between the second connection portion 11 and the third valve V3.

Said 1st sensor S1 is a means to detect that the refrigerant gas in a to-be-refrigerant collection | recovery apparatus runs out and the gas pressure fell from the setting value. The second sensor S2 detects that the gas pressure in the oil separator 1 has decreased below a set value.

  Since the pressure value obtained by the dry compressor 2 fluctuates depending on various conditions such as the outside air temperature, the oil pressure of the lubricator 4 as oil supply means is set by setting a certain upper limit value for the pressure by the pressure regulating valve 3. Keep the spray amount constant. And the balance of supply / exhaust is maintained and the smooth operation of the dry compressor 2 is ensured. As the pressure regulating valve 3 in the first embodiment, a pressure regulating valve 3 manufactured by Kinomiya Seisakusho Co., Ltd. is used.

  The lubricator 4 has a storage part 40 for storing a certain amount of lubricating oil to the dry compressor 2, an oil introduction part 41 for introducing oil from the outside, and a transparent confirmation window for confirming the amount of lubricating oil stored from the outside. A level gauge 42 having refrigerant, a refrigerant gas suction part 43, a refrigerant gas discharge part 44, an oil supply part 45 for supplying a small amount of lubricating oil to be atomized in the lubricator 4, and an oil supply amount adjusting part 46 is provided. Lubricating oil is supplied to the refrigerant gas passage 47 from the refrigerant gas suction part 43 to the refrigerant gas discharge part 44 from the oil supply part. The supply amount of the lubricating oil can be adjusted as appropriate by operating the oil supply amount adjusting unit. The lubricator 4 in the first embodiment uses a lubricator manufactured by Nippon Seiki Co., Ltd.

  In general, the lubricator, including the lubricator 4 according to the first embodiment, is used in a normal atmospheric environment (in an environment where air is used), and is a special type of refrigerant recovery from the refrigerant recovery equipment R. It is not used in a refrigerant gas environment. The lubricator 4 according to the first embodiment is also supposed to be unable to be used because it deteriorates when used in a refrigerant gas environment. For this reason, in Example 1, by using a ready-made lubricator 4 in a refrigerant gas environment and performing a continuous operation test sufficient for its durability, the lubricator 4 is used as a refrigerant in Example 1. It is found to be durable against chlorofluorocarbons. Then, by using in combination with the pressure regulating valve 3, stable oil spraying is performed on the dry compressor 2.

  Next, the operation of the refrigerant recovery apparatus M according to the first embodiment described above will be described with reference to FIG.

  First, the fourth valve V4 of the refrigerant recovery container 5 is opened, and a manifold gauge (manifold having a configuration including a low-pressure side and a high-pressure side pressure gauge) is similarly opened, push-pull is performed, and the refrigerant is recovered. Gas pressure is applied to the cooler unit which is the device R.

  Gas is introduced into the low pressure side connection portion R2 of the cooler unit. Oil and refrigerant (as a mixture of liquid and gas) are introduced from the high pressure side connection portion R1 of the cooler unit into the first connection portion 10 of the oil separator 1 through the passages A1 and A2. When a certain amount of refrigerant from the cooler unit is introduced into the refrigerant recovery processing device, the first connection portion 10 and the oil receiving portion 8 are connected by closing the first valve V1 and opening the second valve V2. Can be switched.

  The refrigerant containing the introduced oil is passed through the central tube 154 in the heat exchanging double tube 152 to exchange heat. The refrigerant containing oil is slightly lifted up a floating valve 156 for preventing backflow provided in the upper part of the heat exchanging double pipe 152, and is separated into refrigerant gas and a mixture of oil and liquid refrigerant.

  Further, the liquid refrigerant containing oil falls to the bottom of the evaporation vaporization chamber 140, and further, due to the difference in specific gravity, the oil is separated into the upper layer and the liquid refrigerant is separated into the lower layer, and is heated by the bottom heater 155. Moisture in the liquid refrigerant is quickly vaporized. In addition, the heating temperature in a present Example is about 40 degreeC.

The inside of the oil separator 1 becomes high pressure due to the heating of the bottom heater, and the refrigerant gas is dried at a pressure optimum for the processing capacity to the dry compressor 2 from the second connecting portion 11 through the pressure regulating valve 3 and the oiling device 4. Send to compressor 2. The optimum pressure value is determined by a pressure regulating valve. In this embodiment, the pressure is about 490 kPa (5 kgf / cm ² ).

  The refrigerant (refrigerant gas) vaporized by the pressure regulating valve 3 from the second connection portion 11 of the oil separator 1 by the suction of the dry compressor 2 is sent to the lubricator 4 at the set constant pressure.

  In the first embodiment, the lubrication device 4 is lubricated by opening the lubrication port cap 48 shown in FIG. 1 and manually supplying the oil from the oil introduction portion 41 of the lubrication device 4 to the storage portion 40.

  The oil feeder 4 in the first embodiment drops the oil stored by the negative pressure from the oil supply unit, atomizes the dropped oil in the refrigerant gas passage 47, and refrigerant together with the refrigerant gas introduced from the refrigerant gas suction unit 43. The gas is discharged from the gas discharge unit 44 to the dry compressor 2.

  The oil is mist-like as lubricating oil and is sucked into the dry compressor 2 to exert a lubricating function in the dry compressor 2.

  Here, when the recovered refrigerant contains a liquid in the lubricator 4, the liquid expands in the introduced lubricator 4, and the synthetic resin transparent in the lubricator 4 is generated by the heat of vaporization during evaporation. Oil gauge tanks that are rapidly cooled can be damaged. For this reason, the oil separator 1 according to the first embodiment prevents the breakage of the transparent oil gauge tank made of the synthetic resin by functioning as a means for quickly vaporizing the refrigerant and allowing the oil filler 4 to pass therethrough.

  The highly compressed refrigerant gas discharged from the dry compressor 2 is introduced into the third connection portion 12 of the oil separator 1. The refrigerant is introduced from the fourth connection portion 13 into the refrigerant recovery container 5 via the fourth valve V4. Furthermore, refrigerant gas can be introduced into the cooler unit from the refrigerant recovery container 5.

  The oil remaining in the oil separator is stored in the oil receiving portion 8 through the passage A2 and the passage G from the first connection portion.

  On the other hand, the lubrication oil is supplied to the lubricator 4 at any time by monitoring the amount of the lubrication oil in the lubricator 4 with a transparent level gauge 42.

  The first sensor S1 constantly monitors the gas pressure in the refrigerant recovery equipment, and if it detects that it is a set pressure (for example, about 0 Pa to −13.3 Pa (about 0 mmHg to about −100 mmHg)), the control is performed. The control device 9 transmits a detection signal to the device 9. Upon receiving the detection signal from the first sensor S1, the control device 9 outputs a stop processing signal for the refrigerant recovery device M to the control device 9.

  The second sensor S2 constantly monitors the gas pressure in the oil separator and transmits a detection signal to the control device 9 when detecting that the pressure is set. The control device 9 outputs an alarm sound command to an alarm buzzer (not shown).

  As described above, the invention according to Example 1 cannot be achieved in the past by combining the known pressure regulating valve 3 and the lubricator 4 in the refrigerant recovery apparatus M using the dry compressor 2, The durability of the dry compressor 2 in a special environment that is constantly exposed to the refrigerant gas is improved, and the long-term quality stability of the refrigerant recovery device M is realized.

  The above is the refrigerant recovery apparatus M according to the first embodiment of the present invention. However, in the present invention, for example, the configurations shown in FIGS. 2 to 4 can be adopted. FIG. 2 shows a range surrounded by a two-dotted line, that is, the pressure regulating valve 3, the lubricator 4, the dry compressor 2, and the condenser 6 as one unit, that is, a refrigerant recovery unit U1. Such unitization makes it easy to combine with existing oil separators and build a refrigerant recovery system. In FIG. 3, the range surrounded by the two-dotted line, that is, the oil separator 1, the oil receiving portion 8, the lubricator 4, the dry compressor 2, and the condenser 6 are configured as one refrigerant recovery unit U <b> 2. According to the refrigerant recovery unit U2, the combination with the existing dry compressor 2 can be facilitated and a refrigerant recovery system can be constructed. FIG. 4 is a combination of the examples of FIGS. 2 and 3 and shows a refrigerant recovery unit U3 that can use existing ones for both the oil separator 1 and the dry compressor 2. FIG. FIG. 5 is a reference diagram illustrating an oil separator used in the refrigerant recovery apparatus according to the first embodiment.

(Example 2)
FIG. 6 shows a refrigerant recovery apparatus M according to a second embodiment, which is an improvement of the refrigerant recovery apparatus M according to the first embodiment of the present invention. The second embodiment is common in the refrigerant recovery device M according to the first embodiment as a basic configuration, but the oil separated by the oil separator 1 is automatically used as the lubricating oil for the dry compressor 2 in the reservoir of the lubricator 4. A configuration to be supplied is added. This automatic supply configuration can be switched to manual supply as in the first embodiment.

  The lubricator 4 itself in the second embodiment is the same as that in the first embodiment, and a storage section 40 that stores a certain amount of lubricating oil to the dry compressor 2, an oil introduction section 41 for introducing oil from the outside, a refrigerant A gas suction part 43, a refrigerant gas discharge part 44, an oil supply part 45 for supplying a small amount of lubricating oil to be atomized inside the lubricator 4, and an oil supply amount adjustment part 46 are provided. Lubricating oil is supplied from the oil supply unit 45 to the refrigerant gas passage 47 from the refrigerant gas suction unit 43 to the refrigerant gas discharge unit 44. The supply amount of the lubricating oil can be adjusted as appropriate by operating the oil supply amount adjusting unit 46. Since the lubricator 4 in the present embodiment 2 is an automatic oil supply system, it is not particularly necessary to monitor the level gauge by visual inspection, and in order to improve the durability of the resin part of the level gauge, an opaque metal is used. The oil gauge tank made from is used.

  The configuration of supplying the separated refrigerant oil to the storage part of the lubricator 4, which is a feature of the refrigerant recovery apparatus M according to the second embodiment, is specifically for recovery from the first connection part 10 of the oil separator 1. Through the passage A2, the connecting portion, and the oil supply passage F, the oil introduction portion 41 of the lubricator 4 is reached. In the oil supply passage F, a sixth valve V6 is provided.

  That is, in the second embodiment, the first valve V1 and the third valve V3 are opened and the second valve V2 and the sixth valve V6 are closed, so that the paths A1 and A2 from the cooler unit to the oil separator 1 are opened. The first valve V1, the third valve V3, and the sixth valve V6 are closed and the second valve V2 is opened, so that the supply of the refrigerant from the cooler unit is stopped and the oil in the oil separator 1 is supplied to the oil receiving portion. 8 can be selected, and the first valve V1 and the second valve V2 are closed and the sixth valve V6 is opened, whereby the oil supply path from the oil supply passage F to the lubricator 4 can be selected. .

  Further, the second embodiment is configured to automatically control the operations of the first valve V1, the second valve V2, the third valve V3, and the sixth valve V6. Specifically, a first sensor S1 (pressure detection means) that detects pressure is provided between the filter in the passage A1 and the first valve V1. Between the 2nd connection part 11 and the 3rd valve | bulb V3, the pressure detection means S2 which detects the setting pressure in the oil separator 1 is provided. The valves, the first sensor S1, and the second sensor S2 are connected to the control device 9 by electric wiring. The control device 9 receives the detection signal of the set pressure from the pressure detection means S2, and outputs a command signal for switching the oil recovery passage from the passage G to the oil supply passage F to the valve. The command signal for switching from the passage G to the oil supply passage F in the second embodiment is output to the first valve V1, the second valve V2, the third valve V3, and the sixth valve V6. In response to the command signal, the first valve V1 is kept closed, the second and third valves are closed, and the sixth valve V6 is opened.

  The operation of the refrigerant recovery device M according to the second embodiment will be described below (although there are portions that overlap with the operation of the refrigerant recovery device according to the first embodiment).

  First, as in the first embodiment, the fourth valve V4 of the refrigerant recovery container 5 is opened, and a manifold gauge (manifold having a configuration including a pressure gauge on the low-pressure side and the high-pressure side) is similarly opened to push-pull. The gas pressure is applied to the low pressure side connection portion R2 of the cooler unit that is the refrigerant recovery device R.

  Gas is introduced into the low pressure side connection portion R2 of the cooler unit, and oil and refrigerant (as a mixture of liquid and gas) are passed from the high pressure side connection portion R1 of the cooler unit through the passages A1 and A2, and the first connection portion of the oil separator 1 10 is introduced. When a certain amount of refrigerant from the cooler unit is introduced into the refrigerant recovery processing device, the first connecting portion 10 and the oil receiving portion 8 are closed by closing the first valve V1, closing the third valve V3, and opening the second valve V2. And so that they are connected.

  The refrigerant containing the introduced oil is passed through the central tube 154 in the heat exchanging double tube 152 to exchange heat. The refrigerant containing oil is slightly lifted up a floating valve 156 for preventing backflow provided in the upper part of the heat exchanging double pipe 152, and is separated into refrigerant gas and a mixture of oil and liquid refrigerant.

  Further, the liquid refrigerant containing oil falls to the bottom of the evaporation vaporization chamber 140, and further, due to the difference in specific gravity, the oil is separated into the upper layer and the liquid refrigerant is separated into the lower layer, and is heated by the bottom heater 155. Moisture in the liquid medium is quickly vaporized.

The inside of the oil separator 1 becomes high pressure due to the heating of the bottom heater, and the refrigerant gas is dried at a pressure optimum for the processing capacity to the dry compressor 2 from the second connecting portion 11 through the pressure regulating valve 3 and the oiling device 4. Send to compressor 2. The optimum pressure value is determined by a pressure regulating valve. In this embodiment, the pressure is about 490 kPa (5 kgf / cm ² ).

  The refrigerant (refrigerant gas) vaporized by the pressure regulating valve 3 from the second connection portion 11 of the oil separator 1 by the suction of the dry compressor 2 is sent to the lubricator 4 at the set constant pressure.

  The oil lubricator 4 introduces and stores oil from the oil introduction unit 41 to the storage unit 40, drops the oil stored by negative pressure from the oil supply unit, atomizes the dropped oil in the refrigerant gas passage 47, The refrigerant gas introduced from the gas suction part 43 is sent to the dry compressor 2 from the refrigerant gas discharge part 44.

Thereafter, the control device 9 detects that the pressure in the oil separator 1 hardly remains and the pressure decreases and reaches a set value (for example, about 68.6 kPa (0.7 kgf / cm ² ) in this embodiment). Upon receiving the detection signal from the means S2 (second sensor), the control device 9 closes the first valve V1 and closes the second valve V2 so that the oil recovery path is from the path A2 to the oil supply path F. Then, a command signal is transmitted and controlled so that the third valve V3 is closed and the sixth valve V6 is opened. The oil is introduced into the oil introduction part 41 of the lubricator 4 by the gas (gas) pressure of about 68.6 kPa (0.7 kgf / cm ² ) in the oil separator 1 and the suction of the dry compressor 2 in the oil separator 1. Replenish as lubricating oil.

  After supplying the separated oil as lubricating oil, the first valve V1 is closed, the third valve is closed, the sixth valve V6 is closed, the second valve V2 is opened, and the first connecting portion 10 and the passage G are connected. The remaining oil is pushed out to the oil receiving portion 8 by the pressure in the oil separator 1.

  In the second embodiment, similarly to the first embodiment, the refrigerant gas discharged from the dry compressor 2 is introduced into the third connection portion 12 of the oil separator 1, and the fourth connection portion 13 through the fourth valve V4, The refrigerant is introduced into the refrigerant recovery container 5 through the introduction side connection portion 50.

  The above is the refrigerant recovery apparatus M according to the second embodiment of the present invention. However, in the present invention, as in the first embodiment, for example, the configuration shown in FIGS. FIG. 7 shows a range surrounded by a two-dotted line, that is, the pressure regulating valve 3, the lubricator 4, the dry compressor 2, and the condenser 6 as one unit, that is, a refrigerant recovery unit U4. Such unitization makes it easy to combine with existing oil separators and build a refrigerant recovery system. In FIG. 8, the range surrounded by the two-dotted line, that is, the oil separator 1, the oil receiving portion 8, the oil filler 4, the dry compressor 2, and the condenser 6 are configured as one refrigerant recovery unit U <b> 5. According to the refrigerant recovery unit U5, the combination with the existing dry compressor 2 can be facilitated and a refrigerant recovery system can be constructed. FIG. 9 is a combination of the examples of FIGS. 7 and 8 and shows a refrigerant recovery unit U6 that can use existing ones for both the oil separator 1 and the dry compressor 2. FIG.

  The oil separator 1 according to the present invention is not particularly limited to those shown in the first and second embodiments, and only has a function of promoting vaporization of the recovered refrigerant. That is, by evaporating the refrigerant and introducing it into the lubricator 4 at a constant pressure, the lubricator 4 can be prevented from being damaged, and the stable operation of the lubricator 4 reduces the consumption of the dry compressor 2 that is the object of the present invention. This is because it can be realized.

In addition, as shown in FIG. 10 as Example 3, in the present invention, the cooler unit and the dry compressor 2 are directly connected without connecting the cooler unit that is the refrigerant recovery device R and the oil separator 1. It can also be set as the structure which interposes the pressure regulating valve 3 and the lubricator 4 between these. That is, when the refrigerant in the cooler unit is a refrigerant gas (gas), it is not necessary to evaporate by the oil separator 1, and therefore the oil separator can be omitted.
On the other hand, when the refrigerant is a liquid refrigerant, the configurations shown in the first and second embodiments are desirable. However, if the processing speed does not need to be considered, the processing capability is very slow, but the oil separator 1 is not used. It can also be.

The dry compressor 2 does not have a configuration corresponding to an oil pan in an oil compressor. For this reason, regardless of whether or not the configuration of the present invention is applied, the refrigerant only has a lubricating action in the dry compressor 2 and does not substantially remain in the dry compressor 2, and as a result, a different kind of refrigerant such as an oil compressor can be obtained. It does not lead to a situation that causes mixing.
Therefore, the present invention can significantly reduce the consumption of the dry compressor 2 with a small amount of lubricating oil while taking advantage of the dry compressor 2 that can prevent mixing of different kinds of refrigerants.

  Further, the present invention provides, for example, a dry recovery apparatus according to Embodiment 2 (for example, FIGS. 6 and 7) of the present invention, such as a refrigerant recovery device shown in FIG. Two or more compressors can be installed. A plurality of these refrigerant recovery devices or refrigerant recovery units are provided by branching the passage B from the second connection portion 11 of the oil separator 1, and the pressure regulating valve 3 and the lubricator 4 disclosed in the first embodiment are provided for each passage B. The dry compressor 2 is sequentially provided, the condenser 6 is provided in the passage C on the discharge side of each dry compressor 2, the respective passages C are connected, and the oil separator is connected to the third connection portion.

  According to this configuration, the improvement in the durability of the dry compressor 2 that is a feature of the present invention can be realized, so that a plurality of the dry compressors are provided, and the efficiency of the refrigerant recovery process is greatly enhanced over a long period of time. Has succeeded.

The piping diagram of the refrigerant | coolant collection | recovery apparatus which concerns on Example 1 of this invention. The piping diagram which shows the relationship between the refrigerant | coolant circulation unit U1 which concerns on Example 1 of this invention, and an oil separator. The piping diagram which shows the relationship between the refrigerant | coolant collection | recovery unit U2 which concerns on Example 1 of this invention, and a dry compressor. The piping diagram which shows the relationship between the refrigerant | coolant collection | recovery unit U3 which concerns on Example 1 of this invention, and the existing installation. The reference drawing which shows the oil separator used for the refrigerant | coolant collection | recovery apparatus which concerns on Example 1 of this invention. The piping diagram of the refrigerant | coolant collection | recovery apparatus which concerns on Example 2 of this invention. The piping diagram which shows the relationship between the refrigerant | coolant collection | recovery unit U4 which concerns on Example 2 of this invention, and an oil separator. The piping diagram which shows the relationship between the refrigerant | coolant collection | recovery unit U5 which concerns on Example 2 of this invention, and a dry compressor. The piping diagram which shows the relationship between the refrigerant | coolant collection | recovery unit U6 which concerns on Example 2 of this invention, and the existing installation. The piping diagram which shows the refrigerant | coolant collection | recovery apparatus which concerns on Example 3 of this invention. The piping diagram which shows the refrigerant | coolant collection | recovery apparatus which concerns on Example 4 of this invention. The piping diagram which shows the refrigerant | coolant collection | recovery unit which concerns on Example 4 of this invention. The piping diagram which shows the conventional refrigerant | coolant collection | recovery apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Oil separator 10 1st connection part 11 2nd connection part 12 3rd connection part 13 4th connection part 14 Hollow trunk | drum 140 Evaporation chamber 141 Upper level sensor 142 Lower level sensor 150 Top end plate 151 Bottom end plate 152 Heat exchange double pipe 153 Outer pipe 154 Center pipe 155 Bottom heater 156 Floating valve 2 Dry compressor 20 Suction side connection part 21 Discharge side connection part 3 Pressure regulating valve 4 Lubricator 40 Storage part 41 Oil introduction part 42 Level gauge 43 Refrigerant Gas suction part 44 Refrigerant gas discharge part 45 Oil supply part 46 Oil supply amount adjustment part 47 Refrigerant gas passage 48 Oil filler cap 5 Refrigerant recovery container 50 Introduction side connection part 51 Discharge side connection part 6 Condenser 7 Filter 8 Oil receiving part 9 Control device A1 passage A2 passage B passage C passage D passage E passage G passage F oil supply Passage M refrigerant recovery apparatus R the refrigerant recovery device (cooler unit)
R1 High-pressure side connection R2 Low-pressure side connection S1 First sensor (pressure detection means)
S2 Second sensor (pressure detection means)
U1 Refrigerant recovery unit U2 Refrigerant recovery unit U3 Refrigerant recovery unit U4 Refrigerant recovery unit U5 Refrigerant recovery unit U6 Refrigerant recovery unit V1 1st valve V2 2nd valve V3 3rd valve V4 4th valve V5 5th valve V6 6th valve Z Refrigerant Collection device (conventional)
Z1 Refrigerant recovery equipment (conventional)
Z2 compressor (conventional)
Z3 condenser (conventional)
Z4 Refrigerant collection container (conventional)
Z5 Pressure detection means (conventional)
Z6 valve (conventional)
Z7 filter (conventional)

Claims (11)

An oil separator that separates the oil from the refrigerant gas containing the oil in the refrigerant recovery device, a dry compressor that serves as a power source for the apparatus, a condenser that uses the separated refrigerant gas as a liquid refrigerant, and a liquid refrigerant that has been separated is stored. In the refrigerant recovery device including the refrigerant recovery container,
Refrigerant recovery characterized in that an oil supply means for spraying oil into the dry compressor is provided in a passage from the oil separator to the dry compressor, and a pressure regulating valve is provided between the oil separator and the oil supply means. apparatus. An oil separator that separates the oil from the refrigerant gas containing the oil of the refrigerant recovery device, a connecting means for the dry compressor, a condenser that uses the separated refrigerant gas as a liquid refrigerant, and a refrigerant recovery that stores the separated liquid refrigerant In the refrigerant recovery unit comprising a container,
The connecting means for the dry compressor, which is a passage from the oil separator to the dry compressor, is provided with an oil supply means for spraying oil into the dry compressor, and a pressure regulating valve is provided between the oil separator and the oil supply means. A refrigerant recovery unit characterized by that. A passage for collecting refrigerant gas containing oil from the refrigerant collection device, a dry compressor connected to the passage, a condenser using the refrigerant gas as a liquid refrigerant, and a refrigerant collection container for storing the separated liquid refrigerant In the refrigerant recovery unit,
A refrigerant recovery unit comprising a pressure regulating valve and oil supply means in the passage.   Refrigerant provided with a passage for collecting refrigerant gas containing oil from the refrigerant collection device, a connecting means for the dry compressor, a condenser using the separated refrigerant gas as a liquid refrigerant, and a refrigerant collection container for storing the separated liquid refrigerant In the recovery unit, a refrigerant recovery unit comprising a pressure regulating valve and an oil supply means in the passage.   2. The refrigerant recovery apparatus according to claim 1, further comprising an oil supply passage for supplying the oil separated by the oil separator to the oil feeder as lubricating oil.   5. The refrigerant recovery unit according to claim 2, further comprising an oil supply passage for supplying the oil separated by the oil separator as lubricating oil to the oil feeder.   A pressure detecting means for detecting a set pressure in the oil separator; and a control device for controlling the supply of oil. The control device receives a detection signal of the set pressure from the pressure detecting means, and passes the oil recovery passage through the passage G. 6. The refrigerant recovery apparatus according to claim 5, wherein a command signal for switching to a path from the oil supply passage to the oil supply passage F is output to the valve, and oil is supplied to the lubricator by suction of a dry compressor.   A pressure detecting means for detecting a set pressure in the oil separator and a control device for controlling oil supply; the control device receives a detection signal of the set pressure from the pressure detecting means; 7. The refrigerant recovery unit according to claim 6, wherein a command signal for switching to a path leading to the oil supply passage F is output to the valve, and oil is supplied to the lubricator by suction of a dry compressor. A passage for collecting refrigerant gas containing oil from the refrigerant collection device, a dry compressor connected to the passage, a condenser using the refrigerant gas as a liquid refrigerant, and a refrigerant collection container for storing the separated liquid refrigerant In the refrigerant recovery device,
A refrigerant recovery apparatus comprising a pressure adjusting valve and an oil supply means in the passage.   A refrigerant supply passage from the refrigerant recovery container to the refrigerant recovery apparatus is provided, and the refrigerant gas in the refrigerant recovery container is sent to the refrigerant recovery apparatus at a high pressure using the pressure difference between the refrigerant recovery container and the refrigerant recovery apparatus. The refrigerant recovery apparatus according to claim 1, 5, 7, or 9, wherein liquid refrigerant in the refrigerant recovery device is discharged.   A refrigerant supply passage is provided from the refrigerant recovery container to the refrigerant recovery device, and the refrigerant gas in the refrigerant recovery container is sent to the refrigerant recovery device at a high pressure using the pressure difference between the refrigerant recovery container and the refrigerant recovery device. The refrigerant recovery unit according to claim 2, 3, 4, 6, or 8, wherein the liquid refrigerant in the refrigerant recovery device is discharged.

Images