JP5107652B2 - Refrigeration cycle equipment - Google Patents

Description

  The present invention relates to a refrigeration cycle apparatus such as an air conditioner and a refrigeration machine using a refrigeration cycle, and in particular, from a CFC or HCFC refrigerant and a mineral oil as a refrigeration oil, to an HFC refrigerant and a refrigeration for HFC. It is suitable for those that are exchanged for those using machine oil.

  CFC-type refrigerant or HCFC-type refrigerant, HFC-type refrigerant that is not compatible with mineral oil from an air conditioner that uses mineral oil as refrigerating machine oil (old machine), and an air-conditioner that uses HFC refrigerating machine oil (new machine) When the connection pipe that connects the indoor unit and the outdoor unit is reused when the replacement is performed, pollutants (impurities) remain in the reused connection pipe. This impurity is insoluble in the HFC refrigerant used in the new machine or is a weakly soluble component such as refrigerating machine oil (mineral oil, alkylbenzene, etc.), oxidative degradation reaction products of refrigeration oil, chlorinated compounds, etc. .

  If no measures are taken against the impurities and the existing connection pipe is used, the refrigerating machine oil in the new machine deteriorates due to the impurities remaining in the connection pipe. Furthermore, components that do not dissolve in the refrigerant may precipitate in the low temperature portion of the refrigeration cycle, clogging the refrigeration cycle, and may significantly impair the reliability of the air conditioner.

  Therefore, it is known to perform a cleaning operation for collecting impurities remaining in the connection pipe when using the existing pipe, which is described in Patent Document 1, for example. Patent Documents 1 and 2 describe that impurities are recovered during operation of the refrigeration cycle.

JP 2000-9368 A JP 2005-315435 A JP-A-2005-214542

  In the above-mentioned Patent Document 1, a foreign matter catching means is disposed between the use side heat exchanger and the compressor at a position that becomes a gas refrigerant, and the HFC refrigerating machine oil mixed with impurities is applied to the foreign matter catching means several times. I had to pass through it repeatedly. Therefore, after replacing the old machine with the new machine, it is necessary to carry out the cleaning operation in the connection pipe for a relatively long time, for example, for about 1 to 2 hours. In other words, the work time for air conditioner replacement work and renewal work was inevitably long.

  Further, in Patent Document 2, a filter built in an impurity recovery container (see FIG. 9) captures impurities in the existing pipe through the filter for the entire amount of liquid refrigerant during operation of the refrigeration cycle. The flow resistance of the liquid refrigerant increases due to the interposition, and the operation point of the refrigeration cycle does not match the operation point of the air conditioner using the new HFC refrigerating machine oil by renewal, which requires a great deal of adjustment. Incidentally, the operating point in the state without a filter is set for the new air conditioner. Furthermore, the flow resistance gradually increases due to clogging of the filter during use of the refrigeration cycle, the operating point of the refrigeration cycle changes, and a great deal of labor is required for the adjustment.

  In Patent Document 3, a bypass pipe is connected in parallel with the filter to suppress an increase in the pressure loss of the liquid refrigerant due to the filter being clogged with impurities. However, if the clogging of the filter is delayed and the trapping ability of the impurities is reduced, the liquid refrigerant almost passes through the bypass pipe and cannot capture the impurities. Further, the impurities once stored in the filter may flow out again into the liquid refrigerant at the pressure of the liquid refrigerant. Furthermore, in the process as described above, the flow resistance of the parallel circuit composed of the filter and the bypass pipe will change, the operating point of the entire refrigeration cycle will change and become unstable, and the refrigeration capacity will deteriorate. It took a lot of effort to make adjustments to prevent it.

  An object of the present invention is to capture residual impurities in the old connection pipe during operation of the new refrigeration cycle apparatus in order to increase the efficiency of the renewal by reusing the old connection pipe of the old refrigeration cycle apparatus in view of the prior art. To provide a refrigeration cycle apparatus capable of maintaining a high refrigeration capacity without adjusting the operating point while maintaining the capacity for a long period of time and suppressing a change in the operating state in the operation of the new refrigeration cycle apparatus. .

In order to solve the above problems, the present invention provides a refrigeration cycle apparatus in which a compressor, a heat source apparatus side heat exchanger, a first expansion apparatus, a second expansion apparatus, and a use side heat exchanger are sequentially connected. Provided between the first expansion device and the second expansion device is a capture container containing a filter that captures at least one of the refrigerant insoluble component or the weakly soluble component with respect to the refrigerant, and fluid is contained in the capture container. The tip of the fluid introduction / exit pipe to be introduced / disposed is disposed below the filter, a bypass pipe connected in parallel below the capture container is disposed , and the fluid introduction / exit pipe is directed upward from the bypass pipe was placed, further, the flow resistance of the bypass pipe, and configured to be larger than flow resistance of the fluid inlet and outlet pipe, the operation of the refrigeration cycle of driving the compressor, always the bypass arrangement And diverted into the fluid inlet and outlet pipe and wherein the flow of the liquid refrigerant.

  The fluid introduction / extraction pipe is disposed between the lower part of the capture container and the bypass pipe so as to communicate the lower part of the filter in the capture container and the bypass pipe.

  Further, during the operation of the refrigeration cycle apparatus, the liquid refrigerant is circulated so that the inside of the capture container is filled with the liquid refrigerant.

  Further, during operation of the refrigeration cycle apparatus, at least one of the refrigerant insoluble component captured by the filter by the liquid refrigerant flow or the weakly soluble component with respect to the refrigerant is stored near the water surface of the liquid refrigerant. Configured.

  In addition, during the operation of the refrigeration cycle apparatus, the filter is arranged so that the filter is submerged in the liquid refrigerant, and at least one of the refrigerant insoluble component or the weakly soluble component captured by the filter The liquid refrigerant above the filter is stored near the water surface.

  In addition, the capture container includes a partition plate that divides the region below the filter into at least two regions, the fluid introduction tube is connected to one region, the fluid outlet tube is connected to the other region, and the fluid introduction tube The liquid refrigerant that has flowed in from the one region enters the filter while rising, and the liquid refrigerant that has passed through the filter is discharged to the fluid outlet pipe through the other region. .

  Further, the capture container raises a refrigerant insoluble component or a weakly soluble component with respect to the refrigerant trapped by the passage of the liquid refrigerant during the refrigeration cycle operation in the filter by its buoyancy and near the water surface of the liquid refrigerant. Store.

  Further, the flow resistance of the bypass pipe is set larger than the flow resistance of the fluid introduction / exit pipe.

  Further, the filter is formed having an element made of at least one of cellulose, polypropylene, and polyester.

  In addition, the pipe diameters of the bypass pipe and the fluid inlet / outlet pipe are set so that the flow rate ratio of the refrigerant flowing into and out of the trapping container is equal to or greater than a predetermined value determined for ensuring the reliability of the equipment. ing.

  According to the present invention, when trapping residual impurities in the old connection pipe during operation of the new refrigeration cycle apparatus, the trapping capability can be maintained for a long period of time and the trapping can be performed reliably, and deterioration of the refrigeration oil for HFC is suppressed. be able to.

  Moreover, the change of the driving | running state of the refrigerating cycle by the driving | operation of a new refrigerating cycle apparatus can be suppressed to the minimum, and a high refrigerating capacity can be maintained without adjustment of an operating point.

  Embodiments of the present invention will be described below with reference to the drawings. The refrigerating machine oil sealed in the old machine will be described as mineral oil.

  FIG. 1 shows a cycle system diagram of the air conditioner of the first embodiment, FIG. 2 shows a cycle system diagram of the second embodiment, and FIG. 3 shows a cycle system diagram of the air conditioner having an inappropriate configuration. Show. 4, 5, and 10 show cross-sectional views of the trapping container, and FIG. 6 shows mineral oil separation characteristics in the presence of HFC refrigerant, HFC refrigerating machine oil, and mineral oil. FIG. 7 shows the relationship between the flow rate ratio of the mineral oil trapping container and the mineral oil trapping amount ratio, and FIG. 8 shows the relationship between the air conditioner operating time and the deterioration index. FIG. 9 shows a cycle system diagram of an air conditioner according to a conventional embodiment.

A method for recovering a refrigerant insoluble component remaining in an existing pipe or a weakly soluble component with respect to the refrigerant will be described with reference to FIGS. Hereinafter, the refrigerant insoluble component remaining in the existing pipe will be described as mineral oil.
When the air conditioner using CFC or HCFC is aged, replace the air conditioner. First, the CFC or HCFC refrigerant is recovered, and the outdoor unit 30 and the indoor units 40a and 40b as new units are replaced with those shown in FIG. The liquid connection pipes 7, 8a, 8b and the gas connection pipes 11a, 11b, 12 are reused from the old machine. Since the outdoor unit 30 is filled with HFC in advance, the indoor unit 30, the liquid connection pipes 7, 8a, 8b and the gas connection pipes 11a, 11b, 12 are evacuated while the blocking valves 6 and 13 are closed. After that, additional charging of HFC and opening of the stop valves 6 and 13 are performed.

  In the case of cooling operation, the high-temperature and high-pressure gas refrigerant compressed by the compressor 1 is discharged from the compressor 1, and the gas refrigerant flows into the heat source side heat exchanger 3 through the four-way valve 2, where heat exchange is performed. To condense. The condensed and liquefied refrigerant passes through the fully expanded first expansion device 4, passes through the blocking valve 6, and is sent to the indoor units 40 a and 40 b. The sent liquid refrigerant flows into the second expansion devices 9a and 9b, where the liquid refrigerant is decompressed to a low pressure to be in a low-pressure two-phase state, and exchanges heat with a use-side medium such as air in the use-side heat exchangers 10a and 10b. Then evaporate and gasify. Thereafter, the gas refrigerant returns to the compressor 1 through the blocking valve 13 and the four-way valve 2. Further, the surplus refrigerant is stored in the receiver 5 in FIG. 1 and in the accumulator 14 in FIG. 2, and the operating pressure and temperature of the refrigeration cycle are maintained in a normal state.

  In the heating operation, the high-temperature and high-pressure gas refrigerant compressed by the compressor 1 is discharged from the compressor 1 together with the refrigeration oil for HFC, and flows into the use side heat exchangers 10a and 10b through the four-way valve 2 and the blocking valve 13. Here, heat is exchanged with the use side medium such as air to condense and liquefy. The condensed and liquefied refrigerant flows into the stop valve 6 and the receiver 5, is decompressed by the first expansion device 4, and is evaporated and gasified by exchanging heat with a heat source medium such as air and water in the heat source unit side heat exchanger 3. . The evaporated and gasified refrigerant returns to the compressor 1 through the four-way valve 2.

FIG. 6 shows the mineral oil when about 10% (= mineral oil amount / (HFC refrigerating machine oil amount + mineral oil amount)) of mineral oil that is insoluble in the HFC refrigerant is mixed with the HFC refrigerant and the HFC refrigerant oil. The separation characteristics are shown. The horizontal axis indicates the solubility of the refrigerant in the refrigeration oil (HFC refrigeration oil + mineral oil), where 0% is only the refrigeration oil (HFC refrigeration oil + mineral oil) and 100% is the refrigerant only. The vertical axis represents temperature.
That is, mineral oil hardly dissolves in the HFC refrigerant, while it dissolves in the HFC refrigerating machine oil. Accordingly, the mineral oil is not separated (dissolved) in the compressor in which a large amount of refrigeration oil for HFC is present, and the liquid pipe section and the liquid from the heat source side heat exchanger 3 to the liquid blocking valve 6 in which a large amount of liquid refrigerant is present. It isolate | separates in the connection piping part 7, 8a, 8b and the receiver 5 (it does not melt | dissolve).

  Therefore, as shown in FIGS. 1 and 2, a mineral oil trapping container 50 is installed in a liquid piping portion where the mineral oil is separated. A filter 51 is provided in the mineral oil trapping container 50, and the filter 51 is a fibrous material having a relatively large number of meshes. The fiber material is made of at least one of cellulose, polyester, and polypropylene.

  The filter 51 includes the upper region 60 filled with the liquid refrigerant above, the first region 61 divided into two by the partition plate 54 below, and the second region 62 below the mineral oil capturing container. 50. The upper ends of the refrigerant introduction pipe 52 and the refrigerant outlet pipe 53 are connected to the regions 61 and 62, respectively, and the lower ends of both the pipes 52 and 53 are connected to the bypass pipe 55. The bypass pipe 55 is connected so as to be interposed in the liquid pipe section from the first expansion device 4 to the liquid blocking valve 6. During operation of the refrigeration cycle apparatus, the refrigerant is filled up to the upper region 60 of the mineral oil capturing container 50 (there may be a space above), and the filter 51 is submerged in the liquid refrigerant.

  In the cooling operation of the operation of the refrigeration cycle apparatus, the liquid refrigerant flows from the first expansion device 4 toward the liquid blocking valve 6 in the liquid pipe portion, and is divided into the bypass pipe 55 and the refrigerant introduction pipe 52. The divided liquid refrigerant flows into the first region 61 from the refrigerant introduction pipe 52, passes upward through the filter 51 as indicated by an arrow, and escapes to the upper region 60 above the filter 51 (partly with a horizontal arrow). Some flow through the filter as well). Further, the liquid refrigerant passes through the filter 51 downward from the upper area 60 as shown by the arrow, reaches the second area 62, and flows from the refrigerant outlet pipe 53 to the liquid piping section in the direction of the liquid blocking valve 6. In the case of heating operation, the refrigerant flow is opposite to the above.

  The liquid refrigerant and the HFC refrigerating machine oil dissolved in the liquid refrigerant are liquids with a remarkably low viscosity, whereas the mineral oil is a liquid having a remarkably higher viscosity than the liquid refrigerant and the HFC refrigerating machine oil dissolved in the liquid refrigerant. Therefore, the liquid refrigerant and the refrigeration oil for HFC dissolved in the liquid refrigerant pass through the filter 51, whereas the mineral oil is caught between the fibers of the filter 51 having a large mesh number, and is then trapped inside the fibers by capillary action.

  Since the mineral oil has a specific gravity smaller than that of the liquid refrigerant, the mineral oil is trapped inside the fiber of the filter 51 and then gradually rises in the filter 51 due to its buoyancy. The mineral oil escapes upward and floats in the liquid refrigerant in the upper region 60. It floats near the water surface and is stored. In this state, since the mineral oil is not taken into the filter 51 again by the action of buoyancy, the filter 51 is not clogged by the mineral oil, and the flow resistance of the refrigerant in the filter 51 does not increase.

  Further, since the refrigerant introduction / extraction pipes 52 and 53 are connected to the capture container 50 from below, the pipe length can be shortened and the flow resistance can be further reduced. Furthermore, since the liquid refrigerant flowing in the liquid pipe part from the first expansion device 4 toward the liquid blocking valve 6 is also divided into the bypass pipe 55, the flow resistance in the liquid pipe part can be further reduced.

  Therefore, by arranging the mineral oil catching container 50 and the bypass pipe 55 in parallel in the liquid piping portion from the first expansion device 4 to the liquid blocking valve 6, compression is performed without increasing the flow resistance of the liquid refrigerant. Of the mineral oil discharged together with the HFC refrigerating machine oil from inside the machine 1, only the mineral oil can be reliably captured by the filter 51, and the supplementary ability can be maintained for a long period of time. This means that even if the new refrigeration cycle apparatus is connected to the old connection pipe, there is little change in the operating state of the refrigeration cycle, and even if it is operated for a long time thereafter, there is little change in the operating state of the refrigeration cycle. Therefore, the adjustment of the apparatus accompanying the change in the operating state as in the prior art is unnecessary, and a high refrigeration capacity can be maintained.

  When the compressor 1 is in the form of a high-pressure chamber system in which the pressure of the refrigerating machine oil reservoir in the compressor 1 is high, or when an oil separator is disposed in the discharge part of the compressor 1, the compressor 1 or the oil separator The temperature of the refrigeration oil stored in the tank becomes high. On the other hand, the temperature of the mineral oil capturing container 50 is lower than that temperature. The deterioration of the refrigerating machine oil is accelerated as the temperature rises, and the deterioration of the HFC refrigerating machine oil is further promoted as the mixing amount of the mineral oil (deteriorating oil) remaining in the existing pipe increases. By capturing the mineral oil in the mineral oil capturing container 50 at a lower temperature than the inside or the oil separator, it is possible to suppress deterioration of the refrigeration oil for HFC.

  Even if the filter 51 is installed in the existing receiver 5 as shown in FIG. 9, it can capture mineral oil. However, in developing a renewal dedicated machine, there may or may not be a receiver 5 in the base refrigeration apparatus. In some refrigeration apparatuses, an increase in the pressure loss of the receiver 5 including the refrigerant introduction / exit pipes 52 and 53 is achieved. Is expected. For this reason, the operating point of the refrigeration cycle differs depending on the presence or absence of the receiver 5, and the control method is different. Therefore, the development man-hours are large in order to cope with both control methods.

  In the present embodiment, the refrigerant introduction / exit pipes 52 and 53 through which the fluid is introduced into and extracted from the mineral oil capturing container 50 are connected by the bypass pipe 55, and the mineral oil capturing container 50 and the bypass pipe 55 are arranged in the liquid piping section. Since the increase in pressure loss can be minimized and the operating point does not change, one control method for the refrigeration cycle apparatus can be used.

  The gas refrigerant in the mineral oil trapping container 50 is condensed by heat exchange between the mineral oil trapping container 50 and its atmosphere, and the mineral oil trapping container 50 is filled with liquid refrigerant. Therefore, it is desirable to set the refrigerant amount so that the operating point (operating point) is the same as that of the base refrigeration apparatus even when the mineral oil capturing container 50 is filled with the liquid refrigerant. For example, if the liquid piping of the base refrigeration apparatus and the liquid connection piping 7, 8 a, 8 b are in a liquid single phase, the renewal dedicated machine with the mineral oil capture container 50 attached has an amount of refrigerant in the mineral oil capture container 50. It is desirable to enclose as much as possible.

  Moreover, since the inside of the mineral oil capturing container 50 is filled with the liquid refrigerant, the mixed liquid of the HFC refrigerant, the HFC refrigerating machine oil, and the mineral oil can be brought into contact with the entire filter 51. In, only mineral oil can be efficiently separated and captured using the entire filter 51.

  Furthermore, the larger the flow rate with respect to the filter 51, the smaller the amount of mineral oil captured by the filter 51. This is because the mineral oil once captured by the filter 51 is pushed out of the filter 51 by the fluid force of the refrigerant. For this reason, the tips of the fluid inlet / outlet pipes 52 and 53 for introducing and discharging the fluid into / from the mineral oil capturing container 50 are arranged below the filter 51, so that the filter 51 does not obstruct the fluid flow direction. The mineral oil thus separated is captured near the upper end of the filter 51 or above the filter 51 and is not in the fluid flowing region, so that the outflow of the mineral oil to the outside of the filter 51 due to the fluid force can be suppressed.

  In addition, since the bypass pipe 55 is arranged in parallel with the mineral oil trapping container 50, the flow rate flowing into the mineral oil trapping container 50 can be suppressed, which is effective in suppressing the derivation of the mineral oil from the filter 51.

  Next, the mineral oil trapping amount of the filter 51 disposed in the mineral oil trapping container 50 having the bypass pipe 55 will be described. FIG. 7 shows the flow rate ratio of the mineral oil catching container (= mineral oil catching part flow rate / total flow rate) and the mineral oil catching container flow rate ratio when the mineral oil is introduced once into the mineral oil catching container at a total flow rate of 207 to 218 kg / h. The ratio of the amount of mineral oil captured when the amount of mineral oil captured by the filter 51 at 100% is 100% is shown. It can be seen from FIG. 7 that the smaller the mineral oil trapping container flow rate ratio is, the smaller the mineral oil trapping ratio is, that is, the slower the mineral oil trapping speed at the filter 51.

  FIG. 8 shows the relationship between the operating time of the air conditioner (lifetime operating time of the equipment) and the deterioration index of the refrigerating machine oil (new oil) enclosed in the new machine. As described above, the smaller the flow rate ratio of the mineral oil trapping section 50, the slower the trapping speed of the mineral oil in the filter 51. Therefore, the amount of time that the deteriorated mineral oil remains in the compressor 1 or the oil separator having a higher temperature remains. Because it becomes longer, it promotes the deterioration of new oil. Therefore, the operation time of the air conditioner needs to be set to a mineral oil trapping portion flow rate ratio: b [%] or more that is equal to or less than the limit value of the deterioration index of the new oil at a predetermined time. Here, the predetermined time indicates, for example, the time corresponding to the maintenance cycle of the device or the design life of the product.

  From the above, the bypass ratio is set so that the flow rate ratio of the refrigerant flowing into and out of the mineral oil catching container 50 is equal to or greater than the predetermined value (mineral oil catching portion flow rate ratio: b [%]) determined for ensuring the reliability of the equipment. It is necessary to set the pipe 55 and the fluid introduction / exit pipes 52 and 53.

  The flow rate flowing into the mineral oil trapping container 50 is determined by the relationship of the pressure loss between the bypass pipe 55, the fluid introduction / exit pipes 52 and 53, and the mineral oil trapping container 50. When the inner diameters of the bypass pipe 55 and the fluid introduction / exit pipes 52 and 53 are equal, for example, if the fluid introduction / exit pipes 52 and 53 are significantly longer than the bypass pipe 55 as shown in FIG. The gas refrigerant in 50 is condensed by heat exchange between the mineral oil trapping container 50 and its atmosphere, and the mineral oil trapping container 50 is filled with the liquid refrigerant, but the bypass pipe 55 and the fluid inlet / outlet pipes 52, 53 Therefore, the refrigerant hardly flows to the mineral oil capturing container 50 side. Therefore, the mineral oil is hardly captured by the filter 51 in the mineral oil capturing container 50.

  Therefore, by disposing the bypass pipe 55 below the mineral oil capturing container 50, the length of the fluid introduction / exit pipes 52 and 53 can be set short, and the pressure loss due to the pipe can be made as small as possible. It is possible to set the partial flow rate ratio to be not less than b [%].

  Similarly, the resistance of the bypass pipe 55 may be set to be larger than the resistance of the fluid introduction / exit pipes 52 and 53 so that the flow rate ratio of the mineral oil capturing part is equal to or greater than b [%]. For example, the inner diameter of the bypass pipe 55 may be set smaller than the inner diameter of the fluid introduction / exit pipes 52 and 53, or a flow rate adjusting valve may be disposed in the bypass pipe 55.

  Further, as a configuration of the mineral oil capturing container 50, as shown in FIG. 4 as a third embodiment of the present invention, the mineral oil capturing container 50 is placed horizontally so that the length of the bypass pipe 55 can be increased. The degree of freedom in designing the fluid inlet / outlet pipes 52 and 53 with a trapping portion flow rate ratio of b [%] or more increases. In this example, since the upper end of the filter 51 protrudes above the surface of the liquid refrigerant in the mineral oil capturing container 50, the captured mineral oil floats on the surface of the liquid refrigerant serving as the upper end of the filter 51 by buoyancy. Stored. Therefore, the stored mineral oil does not hinder the flow of the liquid refrigerant and does not increase the flow resistance.

  Furthermore, as shown in FIG. 5 as a fourth embodiment of the present invention, by installing a bypass pipe 55 in the mineral oil catching container 50, the fluid introduction / extraction is performed so that the flow rate ratio of the mineral oil catching portion becomes b [%] or more. The lengths of the pipes 52 and 53 (portions protruding above the bypass pipe 55) can be set short.

The cycle system diagram of the air conditioner of 1st Example of this invention. The cycle system diagram of the air conditioner of 2nd Example of this invention. Cycle system diagram of an air conditioner with an inappropriate configuration. Sectional drawing of the mineral oil capture | acquisition container of 3rd Example of this invention. Sectional drawing of the mineral oil capture | acquisition container of 4th Example of this invention. Explanatory drawing of the mineral oil separation characteristic in the presence of HFC refrigerant, HFC refrigerating machine oil, and mineral oil. The graph of the relationship between the flow rate ratio of a mineral oil capture container part and a mineral oil capture amount ratio. The graph of the relationship between the operating time of an air conditioner and the deterioration index of the refrigerating machine oil enclosed in the new machine. The cycle system diagram of the air conditioner by a prior art example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Compressor, 2 ... Four-way valve, 3 ... Heat source side heat exchanger, 4 ... 1st expansion device, 5 ... Receiver, 9a, 9b ... 2nd expansion device, 7, 8a, 8b ... Liquid connection piping DESCRIPTION OF SYMBOLS 10a, 10b ... Usage side heat exchanger, 11a, 11b, 12 ... Gas connection piping, 6, 13 ... Stop valve, 14 ... Accumulator, 30 ... Outdoor unit, 40a, 40b ... Indoor unit, 50 ... Mineral oil capture container, DESCRIPTION OF SYMBOLS 51 ... Filter, 52, 53 ... Fluid inlet / outlet pipe, 54 ... Partition plate, 55 ... Bypass piping, 60 ... Upper area | region, 61 ... 1st area | region (one area | region), 62 ... 2nd area | region (other area | region).

Claims (8)

In the refrigeration cycle apparatus formed by sequentially connecting the compressor, the heat source machine side heat exchanger, the first expansion device, the second expansion device, and the use side heat exchanger,
Provided between the first expansion device and the second expansion device is a capture container that houses a filter that captures at least one of a refrigerant insoluble component or a weakly soluble component with respect to the refrigerant,
The distal portion of the fluid inlet and outlet pipe which exits introducing a fluid is arranged below the filter to the capture vessel,
A bypass pipe connected in parallel below the trapping container is disposed, the fluid introduction / exit pipe is disposed upward from the bypass pipe, and the flow resistance of the bypass pipe is further reduced by the fluid introduction / exit pipe. Configured to be greater than the distribution resistance of
In the operation of the refrigeration cycle in which the compressor is driven, the refrigeration cycle apparatus is characterized in that the liquid refrigerant is always divided into the bypass pipe and the fluid introduction / exit pipe.   The fluid introduction / exit pipe is disposed between a lower portion of the capture container and the bypass pipe so as to communicate the lower side of the filter in the capture container and the bypass pipe. Refrigeration cycle equipment.   3. The refrigeration cycle apparatus according to claim 1, wherein during the operation of the refrigeration cycle apparatus, the liquid refrigerant is circulated so that the inside of the capture container is filled with the liquid refrigerant.   During operation of the refrigeration cycle device, at least one of the refrigerant insoluble component or the weakly soluble component with respect to the refrigerant captured by the filter by the flow of the liquid refrigerant is stored near the water surface of the liquid refrigerant. The refrigeration cycle apparatus according to any one of claims 1 to 3, wherein the refrigeration cycle apparatus is provided.   The refrigerant insoluble component captured in the capture container is provided with an upper region above the filter, and the filter is disposed so that the filter is submerged in the liquid refrigerant during operation of the refrigeration cycle apparatus. The refrigeration according to any one of claims 1 to 4, wherein at least one of weakly soluble components with respect to the refrigerant is stored in a liquid refrigerant in an upper region above the filter. Cycle equipment.   The capture container includes a partition plate that divides the region below the filter into at least two regions, the fluid introduction tube is connected to one region, the fluid outlet tube is connected to the other region, and flows from the fluid introduction tube. The liquid refrigerant that has entered the filter enters the filter while rising from the one region, and the liquid refrigerant that has passed through the filter is discharged to the fluid outlet pipe through the other region. The refrigeration cycle apparatus according to any one of claims 1 to 5, characterized in that: The refrigeration cycle apparatus according to any one of claims 1 to 6, wherein the filter has an element made of at least one of cellulose, polypropylene, and polyester . The pipe diameters of the bypass pipe and the fluid inlet / outlet pipe are set so that the flow rate ratio of the refrigerant flowing into and out of the capture container is equal to or greater than a predetermined value determined for ensuring the reliability of the device. The refrigeration cycle apparatus according to any one of claims 1 to 7 , wherein the refrigeration cycle apparatus is characterized in that:

Images