JP2010249382A - Refrigerating machine oil changing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerating machine oil changing device capable of changing a refrigerating machine oil easily while continuing an operation of a refrigerating cycle system. <P>SOLUTION: This refrigerating machine oil changing device 10 includes an oil separating section 11 connected to a refrigerant circulation passage 33 of an air conditioner 30 and recovering the used refrigerating machine oil included in a refrigerant, a new oil supply section 12 connected to the refrigerant circulation passage 33 at a downstream side with respect to the oil separating section 11 and supplying an unused refrigerating machine oil, a recovered oil amount detecting section 13 for detecting the amount of used oil recovered by the oil separating section 11, a supply oil amount detecting section 16, a bypass passage 17, first and second bypass passage opening/closing valves 18, 19, and a control section 14 (determining means 21, opening/closing means 22) for supplying the unused oil of the amount corresponding to the amount of used oil detected by the recovered oil amount detecting section 13 to the refrigerant circulation passage 33 from the new oil supply section 12. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a refrigerating machine oil changer, and more particularly to a refrigerating machine oil changer for an air conditioner.

  A refrigeration cycle system generally includes a compressor that compresses a low-temperature / low-pressure gas refrigerant into a high-temperature / high-pressure gas refrigerant, a condenser that cools and condenses the gas refrigerant discharged from the compressor, The expansion valve includes an expansion valve that expands a high-pressure liquid refrigerant to form a low-temperature / low-pressure liquid refrigerant, and an evaporator that absorbs heat and evaporates the low-temperature / low-pressure liquid refrigerant. In an air conditioner that is a typical example of a refrigeration cycle system, generally, a compressor and a condenser are installed in an outdoor unit, and an evaporator is installed in an indoor unit. An expansion valve is often installed in an outdoor unit in a normal home air conditioner and in an indoor unit in a multi air conditioner.

  The air conditioner is provided with an oil tank filled with refrigerating machine oil. Refrigerating machine oil has a function of lubricating and simultaneously cooling the friction part of the compressor, and plays an important role for the compressor. Currently, the mainstream air conditioner is equipped with a hermetic compressor and does not have a structure that can replace the refrigeration oil. Therefore, the refrigeration oil is required to have high durability that can withstand long-term use. A part of the refrigerating machine oil circulates in the refrigeration cycle together with the refrigerant.

  As a technique related to the present invention, in a hermetic compressor in which a compression mechanism is housed in a sealed container and each sliding part is lubricated by the refrigerating machine oil enclosed in the container, the oil is put in the compressor discharge pipe. Patent Document 1 discloses a hermetic compressor in which an oil separator portion having a path for returning oil into the same container as the separator is provided inside the compressor. Patent Document 1 describes that by providing an oil separator and an oil separator inside the compressor, the oil separator circuit on the refrigeration cycle side can be eliminated, and the size and cost can be simplified. ing.

JP-A-5-195975

  As mentioned above, refrigerating machine oil such as air conditioners is not supposed to be replaced, but the lubrication performance etc. will deteriorate somewhat due to long-term use. Is preferred. However, the current mainstream air conditioner and the conventional structure including the refrigeration cycle system of Patent Document 1 do not have a structure for replacing the refrigeration oil.

  An object of the present invention is to provide a refrigerating machine oil changer capable of changing refrigerating machine oil by a simple method. In particular, it is an object to enable replacement of refrigeration oil while continuing operation of the refrigeration cycle system.

  A refrigerating machine oil changer according to the present invention is a refrigerating machine oil changer used in a refrigerating cycle system having a refrigerant circulation path, and is an oil separator that is connected to the refrigerant circulation path and collects used refrigerating machine oil contained in the refrigerant. And a new oil supply unit that is connected to the refrigerant circulation path downstream of the oil separation unit and supplies unused refrigeration oil.

  According to the said structure, it becomes possible to replace | exchange refrigerating machine oil by the simple method of connecting the oil separation part and new oil supply part of a refrigerating machine oil exchange apparatus to the refrigerant circuit of a refrigerating cycle system. In other words, since a part of the refrigeration oil circulating with the refrigerant in the refrigeration cycle is gradually recovered and replaced with unused oil, it is attached to an existing refrigeration cycle system equipped with a hermetic compressor. Refrigerator oil can be changed.

  In addition, a recovered oil amount detection unit that detects the amount of used oil recovered by the oil separation unit, and a new oil supply that is equivalent to the amount of used oil detected by the recovered oil amount detection unit And a supply amount adjusting means for supplying the refrigerant to the refrigerant circulation path.

  According to the said structure, it becomes possible to match | combine the collection | recovery amount of used oil, and the supply amount of unused oil, and can prevent the excessive collection | recovery and excessive supply of refrigerating machine oil.

  And a new oil supply having a bypass path installed in the refrigerant circulation path downstream of the oil separator and a path changing means for switching a path through which the refrigerant circulates between the refrigerant circulation path and the bypass path. Is provided in the middle of the bypass path, and the supply amount adjusting means controls the operation of the path changing means based on the amount of used oil detected by the recovered oil amount detecting section, thereby It is preferable to adjust the supply amount.

  According to the above configuration, the refrigerating machine oil can be replaced by a simple and inexpensive method. That is, unused oil corresponding to the recovered amount of used oil can be supplied to the refrigerant circulation path by a simple operation of switching the refrigerant circulation path to the bypass path based on the amount of recovered used oil. it can. Moreover, since unused oil is pushed out by circulation of the refrigerant, a pump or the like for supplying the unused oil is unnecessary.

  According to the refrigerating machine oil changing apparatus according to the present invention, refrigerating machine oil can be exchanged by a simple method. Moreover, refrigerating machine oil can be replaced while continuing the operation of the refrigeration cycle system.

It is a figure which shows schematic structure of the air conditioning machine in which the refrigerator oil replacement apparatus in embodiment which concerns on this invention was attached. It is a figure which shows the structure of the refrigerating machine oil replacement | exchange apparatus shown in FIG. It is a flowchart which shows the replacement | exchange procedure of the refrigerating machine oil using the refrigerating machine oil replacement | exchange apparatus of the structure shown in FIG.

  Hereinafter, embodiments of a refrigerating machine oil changer according to the present invention will be described in detail with reference to the drawings. In the following description, the refrigerating machine oil changer is described as being attached to an air conditioner, but it can also be used in a refrigeration cycle system other than an air conditioner, for example, a refrigeration apparatus, a freezing apparatus, an ice making apparatus, or the like.

  FIG. 1 is a diagram showing a schematic configuration of an air conditioner 30 to which a refrigerating machine oil changer 10 is attached. As shown in the figure, the air conditioner 30 includes an outdoor unit 31, an indoor unit 32, and a refrigerant circulation path 33 for connecting the outdoor unit 31 and the indoor unit 32 to circulate the refrigerant. The main devices constituting the refrigeration cycle of the air conditioner 30 are a compressor 34, a condenser 35, an expansion valve 36, and an evaporator 37. For example, the compressor 34 and the condenser 35 are added to the outdoor unit 31, and the expansion valve 36 is set. The evaporator 37 is installed in the indoor unit 32.

  The compressor 34 has a function of compressing a low-temperature / low-pressure gas refrigerant into a high-temperature / high-pressure gas refrigerant. The compressor 34 mounted on the air conditioner 30 is mainly a hermetic compressor in which a piston and a motor (not shown) are integrally sealed in a steel container. The container of the compressor 34 is filled with refrigeration oil.

  The refrigerating machine oil has a function of lubricating the friction part of the compressor 34 and cooling it at the same time. Most of the refrigerating machine oil is stored in the container of the compressor 34, but a part of the refrigerating machine oil circulates in the refrigerant circulation path 33 together with the refrigerant. As described above, currently mainstream air conditioners (multi-air conditioners) do not have a structure for replacing refrigeration oil. Therefore, the refrigeration oil is required to have high durability that can withstand long-term use. In addition, it does not specifically limit as refrigerating machine oil, For example, the oil to which antioxidant, an antifoamer, etc. were added is used.

  The condenser 35 is a heat exchanger that converts gas into a liquid, and has a function of cooling and condensing the gas refrigerant discharged from the compressor 34 to form a high-temperature and high-pressure liquid refrigerant. As a cooling method of the condenser 35, a water cooling type and an air cooling type are generally used. In the air conditioner 30, an air cooling type using a fan (not shown) is mainly used.

  The expansion valve 36 has a function of expanding a high-temperature / high-pressure liquid refrigerant into a low-temperature / low-pressure liquid refrigerant. As the expansion valve 36, a temperature expansion valve, an electronic expansion valve, or the like is used. In the air conditioner 30, an electronic expansion valve is usually used. Instead of the expansion valve 36, a character tube can be used. The evaporator 37 is a heat exchanger that uses liquid as a gas, and has a function of causing the liquid refrigerant of low temperature and low pressure to absorb heat and evaporate the liquid refrigerant. The evaporator 37 of the air conditioner 30 has fins (not shown), and exchanges heat when indoor air is passed between the fins.

  The refrigerant circulation path 33 is a pipe (refrigerant pipe) for connecting each refrigeration cycle component device and circulating the refrigerant. When the air conditioner 30 is in cooling operation, the refrigerant circulates in the direction indicated by the arrow in FIG. Therefore, high-pressure refrigerant flows in the refrigerant circulation path 33 from the outlet of the compressor 34 to the expansion valve 36, and low-pressure refrigerant flows from the outlet of the expansion valve 36 to the inlet of the compressor 34. The refrigerant is not particularly limited, and a fluorocarbon refrigerant or an ammonia refrigerant is used.

  The air conditioner 30 is usually provided with a four-way valve (not shown) used when switching between the cooling operation and the heating operation. In addition, a liquid separator, an evaporation pressure adjusting valve, a thermostat, a pressure switch and the like (not shown) are installed.

  As shown in FIG. 1, the refrigerating machine oil changer 10 is attached between an outdoor unit 31 and an indoor unit 32. Specifically, the high pressure side between the condenser 35 and the expansion valve 36 (the portion through which the high-pressure refrigerant flows) and the low pressure side between the evaporator 37 and the compressor 34 (the portion through which the low-pressure refrigerant flows) are two. Connected to the location. As described above, the refrigerating machine oil of the air conditioner 30 has high durability because it is not assumed to be replaced. However, the lubrication performance and the like are somewhat deteriorated due to long-term use. If it is possible to replace it, it is preferable to replace it periodically. The refrigerating machine oil changer 10 is a device that enables simple replacement of refrigerating machine oil, and gradually changes a part of refrigerating machine oil circulating through the refrigerant circulation path 33 together with the refrigerant.

  As shown in FIG. 2, the refrigerating machine oil changer 10 includes an oil separation unit 11 that collects used refrigerating machine oil, and a new oil supply unit 12 that supplies new unused refrigerating machine oil. In the refrigerant circulation path 33 that connects the outdoor unit 31 and the indoor unit 32, the oil separation unit 11 is attached to the upstream side of the refrigerant flow, and the new oil supply unit 12 is attached to the downstream side. Then, the refrigeration oil is replaced by supplying from the new oil supply unit 12 an amount of unused oil corresponding to the amount of used oil recovered by the oil separation unit 11.

  Moreover, the refrigerating machine oil change apparatus 10 can perform replacement | exchange of refrigerating machine oil automatically. Further, the replacement can be performed while the operation of the air conditioner 30 is continued. As components for realizing this, the refrigerating machine oil changer 10 is detected by a recovered oil amount detector 13 that detects the amount of used oil recovered by the oil separator 11 and a recovered oil amount detector 13. And a control unit 14 for supplying an amount of unused oil corresponding to the amount of used oil from the new oil supply unit 12 to the refrigerant circulation path 33. Furthermore, it has a recovered oil storage unit 15 connected to the oil separation unit 11, a supply oil amount detection unit 16 that detects a supply amount of unused oil, and a bypass passage 17 of the refrigerant circulation path 33.

  The oil separator 11 has a function of collecting used refrigeration oil contained in the refrigerant flowing through the refrigerant circulation path 33. That is, the oil separation unit 11 separates the refrigerant and the refrigerating machine oil and collects only the refrigerating machine oil. The oil separation unit 11 needs to be installed on the upstream side of the refrigerant flow with respect to the new oil supply unit 12, and is preferably connected to the high-pressure side of the refrigerant circuit 33 as shown in FIG. In addition, as an apparatus applicable to the oil separation part 11, a well-known oil separator can be applied without being specifically limited, For example, a cyclone type oil separator can be applied.

  The used refrigeration oil separated by the oil separation unit 11 is stored in the recovered oil storage unit 15. The recovered oil reservoir 15 is a container that is connected to the lower part of the oil separator 11 and collects used oil separated by the oil separator 11. Although the capacity | capacitance of the collection | recovery oil storage part 15 can also be set as the capacity | capacitance which can collect | recover the whole quantity of refrigerating machine oil, it installs the discharge valve which is not shown in figure, and discharges | emits suitably from the refrigerating machine oil exchange apparatus 10 (recovered oil storage part 15). You can also. Here, the used refrigeration oil means the refrigeration oil circulated through the refrigerant circulation path 33 and is distinguished from the unused oil stored in the new oil supply unit 12.

  The recovered oil amount detection unit 13 has a function of detecting the amount of used oil recovered by the oil separation unit 11 as described above. The recovered oil amount detection unit 13 can be installed in the recovered oil storage unit 15, and for example, a weight scale can be used. Specifically, the recovered oil amount detection unit 13 that is a weigh scale detects the amount of recovered used oil by measuring the weight of the recovered oil storage unit 15. The recovered oil amount detection unit 13 is connected to the control unit 14, and the measurement information is transmitted to the control unit 14.

  The new oil supply unit 12 has a function of supplying unused refrigeration oil. Specifically, it has a function of supplying an amount of unused oil corresponding to the amount of used oil recovered by the oil separator 11. The new oil supply unit 12 needs to be installed on the downstream side of the refrigerant flow with respect to the oil separation unit 11, and as shown in FIG. 2, from the viewpoint of facilitating the supply of unused oil, the refrigerant circulation path It is preferable to be connected to the low pressure side of 33. In addition, although the supply pump etc. of unused oil can also be installed in the new oil supply part 12, as shown in FIG. 2, the structure which provides the bypass path 17 and is installed in the middle is preferable. That is, the new oil supply unit 12 is an unused oil storage container, and the unused oil is supplied by controlling the operation of a bypass passage opening / closing valve described later.

  The new oil supply unit 12 is preferably provided with a supply oil amount detection unit 16 that detects the supply amount of unused oil. As the supply oil amount detection unit 16, a weigh scale can be used similarly to the recovered oil amount detection unit 13, and the amount of unused oil supplied is detected by measuring the weight of the new oil supply unit 12. To do. The supply oil amount detection unit 16 is connected to the control unit 14 and the measurement information is transmitted to the control unit 14.

  Moreover, the new oil supply part 12 is installed in the middle of the bypass path 17 as mentioned above. The bypass path 17 is a path that bypasses the refrigerant circulation path 33 and is used when unused oil is supplied from the new oil supply unit 12. That is, the refrigerant is introduced into the new oil supply unit 12 to push out unused oil. Therefore, the connecting portion between the refrigerant circulation path 33 and the bypass path 17 is provided with, for example, a first bypass path opening / closing valve 18 that is a three-way valve as path changing means. A second bypass passage opening / closing valve 19 that opens and closes between the new oil supply portion 12 and the refrigerant circulation passage 33 is also provided on the downstream side of the new oil supply portion 12. Here, the bypass passage opening / closing valves 18 and 19 are electromagnetic valves, and are opened / closed simultaneously under the control of the control unit 14. In addition, if the bypass path 17 can be opened and closed and unused oil can be supplied from the new oil supply unit 12 when necessary, the number and installation locations of the bypass path opening and closing valves are not limited.

  The refrigerating machine oil changer 10 preferably has an integral shape in which components such as the oil separation unit 11, the new oil supply unit 12, and the control unit 14 are housed in one housing. The refrigerating machine oil changer 10 is provided with four connection ports connected to the refrigerant circulation path 33, and each connection port is provided, for example, in the oil separation unit 11 and the bypass path 17. Further, a display unit (not shown) may be provided outside the refrigerating machine oil changer 10 to display the progress of refrigerating machine oil exchange, for example, the used oil recovery amount and the unused oil supply amount.

  Further, a bypass path (not shown) can be installed in the oil separation unit 11. The oil separation unit 11 is installed in the middle of the bypass path, and operates an on-off valve or the like (not shown) so that the refrigerant flows through the bypass path when replacing the refrigeration oil. For example, when it takes a long time to replace the refrigerating machine oil, when the replacement operation is completed, that is, when a target amount of unused oil is supplied from the new oil supply unit 12, the refrigerant circulation path is removed from the bypass path. The oil separation can be completed by automatically switching to the refrigerant circulation path 33. In addition, a check joint 20 for adding new oil can be provided in the new oil supply unit 12.

  As described above, the refrigerating machine oil changer 10 includes the control unit 14 as supply amount adjustment means that automatically adjusts the supply amount of unused oil. The control unit 14 has a function of supplying unused oil in an amount corresponding to the amount of used oil collected by the oil separation unit 11 from the new oil supply unit 12 to the refrigerant circulation path 33. Specifically, the control unit 14 includes a determination unit 21 and an opening / closing unit 22. The control unit 14 includes a CPU, an input device used for inputting control parameters used when executing the functions of the above-described means, a recording device that stores the input control parameters, a control program, and the like. A device including an input / output port and the like, and can be configured by a computer. Each function of the control unit 14 can be realized by executing software.

  The determination means 21 determines the amount of recovered used oil so that the amount of unused oil corresponding to the amount of used oil detected by the recovered oil amount detection unit 13 is supplied from the new oil supply unit 12. Thus, it has a function of calculating the supply amount of unused oil. Specifically, the amount of used oil which is detection information detected by the recovered oil amount detection unit 13 is acquired, and the supply amount of unused oil is calculated based on the information. The calculated total supply amount is equal to the total recovered amount of used oil. However, as will be described later, it is preferable that the supply of unused oil is performed separately, so the supply amount per time Is an amount obtained by subtracting the total recovery amount at the previous time from the total recovery amount at the current time point.

  In addition, since it is assumed that the collection | recovery of used oil by the oil separation part 11 requires a long time, it is preferable to supply after the collection | recovery progresses to some extent rather than always supplying an unused oil. Therefore, for example, a threshold value for starting the supply of unused oil from the new oil supply unit 12 within a range in which the operation of the compressor 34 is not hindered due to a decrease in the refrigerator oil, such as 1% or 10% of the total amount of the refrigerator oil, It is preferable that a predetermined amount is determined in advance. That is, the determination means 21 determines whether or not the amount of collected used oil has reached a predetermined amount. Further, by repeating the collection of used oil and the supply of unused oil, the ratio of unused oil gradually increases and the refrigeration oil is replaced. However, the unused oil supplied from the new oil supply unit 12 is used for the purpose. When the amount reaches the target amount (target amount: arbitrarily determined), the replacement work is terminated. Whether or not the target amount has been reached is also determined by the determination means 21.

  The opening / closing means 22 has a function of switching the path through which the refrigerant circulates between the refrigerant circulation path 33 and the bypass path 17. Specifically, the opening / closing operation of the first bypass passage opening / closing valve 18 and the second bypass passage opening / closing valve 19 is controlled. The opening / closing means 22 controls the opening time, timing, and the like of the first bypass path opening / closing valve 18 and the second bypass path opening / closing valve 19 based on the determination information of the determination means 21 and the supply amount calculation information.

  The operation of the refrigerating machine oil changer 10 having the above-described configuration, that is, the refrigerating machine oil replacement method of the air conditioner 30 using the refrigerating machine oil changer 10 will be described with reference to FIG. Here, FIG. 3 is a flowchart showing a procedure for replacing the refrigerating machine oil using the refrigerating machine oil changing apparatus 10.

  First, the refrigerating machine oil changer 10 is connected to the refrigerant circulation path 33 of the air conditioner 30 (S10). At this time, as shown in FIG. 2, the oil separation unit 11 is mounted on the high pressure side and the bypass path 17 is on the low pressure side. Then, the cooling operation of the air conditioner 30 is started, and the refrigerant circulation in the refrigerant circulation path 33 is started (S11).

  When the refrigerant circulates in the refrigeration cycle, a part of the refrigerating machine oil circulates together with the refrigerant. Therefore, the refrigerant containing the refrigeration oil is introduced into the oil separation unit 11, and the refrigerant and the refrigeration oil contained in the refrigerant are separated (S12). The separated used refrigeration oil is stored in the recovered oil storage unit 15 connected to the oil separation unit 11, and the refrigerant flows toward the indoor unit 32.

  Next, the recovered oil amount detection unit 13 measures the weight of the recovered used oil, and determines whether or not the predetermined amount has been reached based on the measurement information (S13). This procedure is executed by the function of the determination unit 21 of the control unit 14. When the determination unit 21 determines that the predetermined amount has been reached, the supply amount of the unused oil is calculated, and the calculation information is transmitted to the opening / closing unit 22 together with the determination information.

  When it is determined in S13 that the recovered used oil has reached a predetermined amount, the first bypass passage opening / closing valve 18 and the second bypass passage opening / closing valve 19 are opened, and the unused oil is supplied from the new oil supply unit 12. Is supplied (S14). This procedure is executed by the function of the opening / closing means 22. When the bypass passage opening / closing valves 18 and 19 are opened, the refrigerant flows through the bypass passage 17, so that unused oil is pushed out and supplied to the refrigerant.

  Next, the supply oil amount detecting unit 16 determines whether or not the supply amount of the unused oil has reached the calculated amount (the supply amount of the three kinds of unused oils in S13) (S15). This determination procedure is executed by the function of the opening / closing means 22. When it is determined that the calculated amount has been reached, the opening / closing means 22 closes the first bypass passage opening / closing valve 18 and the second bypass passage opening / closing valve 19 and stops the supply of unused oil from the new oil supply section 12. (S16). That is, the bypass path 17 is closed and the path through which the refrigerant circulates is returned to the refrigerant circulation path 33.

  By repeating the procedures of S12 to S16, the used oil is replaced with the unused oil, and the ratio of the unused oil gradually increases. And based on the information by the supply oil amount detection part 16, it is determined whether the target amount of unused oil was supplied from the new oil supply part 12 (S17). This procedure is executed by the function of the determination means 21, and when it is determined that the target amount of unused oil has been supplied, the replacement operation is terminated. On the other hand, when it is determined that the target amount of unused oil has not yet been supplied, the procedures of S12 to S16 are repeated. Note that, as described above, a bypass path may be provided in the oil separation unit 11 and the oil separation may be automatically ended by closing the bypass path and determining the completion of the replacement work.

  As described above, the refrigerating machine oil changer 10 is connected to the refrigerant circulation path 33 of the air conditioner 30, and the oil separating unit 11 that collects used refrigerating machine oil contained in the refrigerant and the downstream side of the oil separating unit 11. A new oil supply unit 12 connected to the refrigerant circulation path 33 for supplying unused refrigeration oil, a recovered oil amount detection unit 13 for detecting the amount of used oil recovered by the oil separation unit 11, and The amount of unused oil corresponding to the amount of used oil detected by the supply oil amount detection unit 16, the bypass passage 17, the first and second bypass route opening / closing valves 18 and 19, and the recovered oil amount detection unit 13 Is supplied from the new oil supply unit 12 to the refrigerant circulation path 33 (determining means 21, opening / closing means 22), so that the refrigerating machine oil can be easily replaced while continuing the operation of the air conditioner 30. It becomes possible to do.

  In the above description, the refrigerating machine oil is replaced during the cooling operation. However, the refrigerating machine oil can be replaced during the heating operation.

  DESCRIPTION OF SYMBOLS 10 Refrigerator oil changer, 11 Oil separation part, 12 Fresh oil supply part, 13 Collected oil quantity detection part, 14 Control part, 15 Collected oil storage part, 16 Supply oil quantity detection part, 17 Bypass path, 18 1st bypass path On-off valve, 19 Second bypass on-off valve, 20 Check joint, 21 Determination means, 22 Open / close means, 30 Air conditioner, 31 Outdoor unit, 32 Indoor unit, 33 Refrigerant circuit, 34 Compressor, 35 Condenser, 36 Expansion Valve, 37 Evaporator.

Claims (3)

A refrigerating machine oil changer used in a refrigeration cycle system having a refrigerant circuit,
An oil separator connected to the refrigerant circuit and collecting used refrigeration oil contained in the refrigerant;
A new oil supply unit that is connected to the refrigerant circuit downstream of the oil separation unit and supplies unused refrigeration oil;
A refrigerating machine oil changer characterized by comprising: In the refrigerating machine oil changer according to claim 1,
A recovered oil amount detection unit for detecting the amount of used oil recovered by the oil separation unit;
A supply amount adjusting means for supplying an amount of unused oil corresponding to the amount of used oil detected by the recovered oil amount detection unit from the new oil supply unit to the refrigerant circuit;
A refrigerating machine oil changer characterized by comprising: In the refrigerating machine oil changer according to claim 1 or 2,
A bypass path installed in the refrigerant circulation path downstream of the oil separator;
Path changing means for switching a path through which the refrigerant circulates between the refrigerant circulation path and the bypass path;
Have
The new oil supply unit is provided in the middle of the bypass path,
The supply amount adjusting means adjusts the supply amount of the unused oil by controlling the operation of the path changing means based on the amount of used oil detected by the recovered oil amount detecting unit. Machine oil changer.

Images