JP6430002B2 - Refrigeration cycle equipment - Google Patents

Description

  The present invention relates to a refrigeration cycle apparatus having a refrigerant pipe for capturing sludge.

  Sludge contained in the refrigerant circulating through the refrigeration apparatus may cause wear of the piping, clogging of the expansion device, failure of the compressor, and the like. For example, in a conventional refrigeration apparatus, a strainer having a fibrous filter is installed in a refrigerant circulation path through which refrigerant circulates to capture a solid polymer (see Patent Document 1).

JP 2011-226729 A

  However, since the refrigeration cycle apparatus of Patent Literature 1 is configured to add a strainer to the refrigerant circulation path, the cost increases. Furthermore, in the configuration of Patent Document 1, the fibrous filter that has captured the sludge may be clogged, and the circulation of the refrigerant may be hindered.

  The present invention has been made against the background of the above problems, and has a refrigerant pipe that can capture sludge contained in the refrigerant with a simple configuration and can suppress the possibility of clogging of the refrigerant circuit. The purpose is to obtain a refrigeration cycle apparatus.

The refrigeration cycle apparatus according to the present invention includes a refrigerant circuit through which a refrigerant circulates, and the refrigerant circuit includes a condenser, an expansion device, and a refrigerant pipe connecting the condenser and the expansion device. the refrigerant pipe may include a first bottom and the second bottom portion and the third bottom, the second bottom portion is positioned between said expansion device and said first bottom portion, the third The bottom is located between the first bottom and the condenser, and the first bottom , the second bottom , and the third bottom constitute a bottom of the refrigerant pipe, and the refrigerant The pipe is downwardly inclined at a first angle from the second bottom to the first bottom at a first angle, and at a second angle that is smaller than the first angle from the third bottom to the first bottom. And a second inclined portion that is inclined toward the surface .

  According to the refrigeration cycle apparatus of the present invention, sludge contained in the refrigerant can be captured with a simple configuration, and the possibility of clogging the refrigerant circuit can be suppressed.

It is the figure which described typically an example of the refrigerant circuit of the refrigerating-cycle apparatus which concerns on Embodiment 1 of this invention. It is the figure which described typically an example of the longitudinal cross-section of the refrigerant | coolant piping described in FIG. It is the figure which described AA cross section of FIG. 2 typically. It is the figure which described typically the modification 1 of Embodiment 1 which is a modification of FIG. It is the figure which described typically the modification 2 of Embodiment 1 which is a modification of FIG. It is the figure which described typically the modification 3 of Embodiment 1 which is a modification of FIG. It is the figure which described typically the modification 4 of Embodiment 1 which is a modification of FIG. It is the figure which described typically the modification 5 of Embodiment 1 which is a modification of FIG. It is the figure which described typically the modification 6 of Embodiment 1 which is a modification of FIG. It is the figure which described typically the modification 7 of Embodiment 1 which is a modification of FIG. It is the figure which described typically the BB cross section of FIG. It is the figure which described typically the modification 8 of Embodiment 1 which is a modification of FIG. It is the figure which described typically the modification 9 of Embodiment 1 which is a modification of FIG. It is the figure which described typically the modification 10 of Embodiment 1 which is a modification of FIG. It is the figure which described typically the modification 11 of Embodiment 1 which is a modification of FIG. It is the figure which described typically the modification 12 of Embodiment 1 which is a modification of FIG. It is the figure which described typically the modification 13 of Embodiment 1 which is a modification of FIG. It is the figure which described typically an example of the refrigerant circuit of the refrigerating-cycle apparatus which concerns on Embodiment 2 of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and the description thereof is omitted or simplified as appropriate. In addition, the shape, size, arrangement, and the like of the configuration described in each drawing can be changed as appropriate within the scope of the present invention.

[Refrigeration cycle equipment]
Embodiment 1 FIG.
1 is a diagram schematically illustrating an example of a refrigerant circuit of a refrigeration cycle apparatus according to Embodiment 1 of the present invention. In FIG. 1, thick arrows indicate the direction of refrigerant flow. As shown in FIG. 1, the refrigeration cycle apparatus 10 according to this embodiment includes a compressor 1, a first heat exchanger 2 that functions as a condenser, an expansion device 3, and a second heat that functions as an evaporator. The exchanger 4 is annularly connected by piping, and has a refrigerant circuit in which the refrigerant circulates. The refrigerant used in this embodiment includes, for example, a substance having a double bond in a molecule such as HFO-1123, HFO-1234yf, or HFO-1234ze as at least one component. May not be included. At least a part of the pipe 50 that connects the refrigerant outlet side of the first heat exchanger 2 that functions as a condenser and the expansion device 3 is constituted by a refrigerant pipe 100 having a sludge trapping part 110. The first heat exchanger 2 corresponds to the “condenser” of the present invention.

  The compressor 1 is an inverter compressor that is controlled by an inverter, for example, and can change the capacity (the amount of refrigerant sent out per unit time) by arbitrarily changing the operating frequency. The 1st heat exchanger 2 which functions as a condenser makes the refrigerant which flows through the 1st heat exchanger 2 heat-exchange with air, for example, and condenses a refrigerant. For example, a blower (not shown) that guides air to the first heat exchanger 2 is installed in the vicinity of the first heat exchanger 2. The expansion device 3 expands the refrigerant that passes through the expansion device 3, and includes, for example, an expansion valve or a capillary tube whose opening degree can be adjusted. The 2nd heat exchanger 4 which functions as an evaporator makes a refrigerant | coolant which flows through the 2nd heat exchanger 4 heat-exchange with air, for example, and evaporates a refrigerant | coolant. For example, a blower (not shown) that guides air to the second heat exchanger 4 is installed in the vicinity of the second heat exchanger 4.

[Operation of refrigeration cycle equipment]
Next, an example of the operation of the refrigeration cycle apparatus 10 will be described. The refrigerant compressed by the compressor 1 is heat-exchanged by the first heat exchanger 2 and condensed. The refrigerant condensed in the first heat exchanger 2 is expanded by the expansion device 3. The refrigerant expanded by the expansion device 3 undergoes heat exchange by the second heat exchanger 4 and evaporates. The refrigerant evaporated in the second heat exchanger 4 is sucked into the compressor 1 and compressed again.

[Refrigerant piping]
Next, the refrigerant | coolant piping 100 applied to the refrigerating-cycle apparatus 10 of this embodiment is demonstrated. The refrigerant pipe 100 according to this embodiment constitutes at least a part of the pipe 50 that connects the refrigerant outflow side of the first heat exchanger 2 and the expansion device 3. The liquid phase refrigerant condensed in the first heat exchanger 2 flows to the expansion device 3 through the refrigerant pipe 100. The refrigerant pipe 100 has a sludge capturing unit 110, and the sludge capturing unit 110 separates and captures sludge from the liquid refrigerant condensed in the first heat exchanger 2. Sludge is a solid polymer or the like generated from impurities contained in the refrigerant or a substance having a double bond.

  FIG. 2 is a diagram schematically illustrating an example of a longitudinal section of the refrigerant pipe illustrated in FIG. 1, and FIG. 3 is a diagram schematically illustrating the AA section of FIG. 2. In FIG. 2, thick arrows indicate the direction in which the refrigerant flows. Moreover, in FIG. 3, the cross-sectional part is described with the continuous line, and the part other than a cross section is described with the dotted line. As shown in FIG. 2, the refrigerant pipe 100 includes a first cylinder part 106, a second cylinder part 102, and a third cylinder part 104. The 1st cylinder part 106, the 2nd cylinder part 102, and the 3rd cylinder part 104 are connected linearly, and the refrigerant | coolant piping 100 has a substantially linear shape.

  The first tube portion 106 is connected between the second tube portion 102 and the third tube portion 104. The inner peripheral surface of the first tube portion 106 includes a first inner bottom portion 107. The first inner bottom portion 107 is a portion of the inner peripheral surface of the first tube portion 106 that is located below the gravity direction when the refrigerant pipe 100 is installed. The second cylinder portion 102 is connected between the first cylinder portion 106 and the expansion device 3. The inner peripheral surface of the second cylindrical portion 102 includes a second inner bottom portion 103. The second inner bottom portion 103 is a portion of the inner peripheral surface of the second cylindrical portion 102 that is located below the gravity direction when the refrigerant pipe 100 is installed. The third cylinder part 104 is connected between the first cylinder part 106 and the first heat exchanger 2. The inner peripheral surface of the third cylindrical portion 104 includes a third inner bottom portion 105. The third inner bottom portion 105 is a portion located below the gravitational direction on the inner peripheral surface of the third cylindrical portion 104 when the refrigerant pipe 100 is installed.

  When the refrigerant pipe 100 is installed, the first inner bottom portion 107 is positioned lower in the gravity direction than the second inner bottom portion 103 and the third inner bottom portion 105. That is, the first inner bottom portion 107 is recessed from the second inner bottom portion 103 and the third inner bottom portion 105, and the recessed space from the second inner bottom portion 103 and the third inner bottom portion 105 to the first inner bottom portion 107 is sludge. The capturing unit 110 is configured.

  As shown in FIGS. 2 and 3, the first tube portion 106 has a larger equivalent diameter than the second tube portion 102 and the third tube portion 104. The second cylinder part 102 and the third cylinder part 104 have substantially the same cross-sectional shape. The cross-sectional shapes of the second tube portion 102 and the third tube portion 104 are not particularly limited, and may be rectangular or elliptical, but the cross-sectional shapes of the second tube portion 102 and the third tube portion 104 are not limited. When is circular, the pressure resistance of the second cylinder portion 102 and the third cylinder portion 104 can be improved.

  In the example shown in FIG. 3, the upper portion of the first cylindrical portion 106 has a semicircular shape, and has substantially the same cross-sectional shape as the upper portions of the second cylindrical portion 102 and the third cylindrical portion 104. Yes. The lower portion of the first cylindrical portion 106 has a substantially box shape having a linear portion extending downward from both ends of the semicircular portion at the upper portion of the first cylindrical portion 106 and a bottom portion connecting the lower ends of the linear portions. It has a cross-sectional shape. The sludge capturing part 110 of the example of this embodiment has substantially the same width as the inner diameters of the second cylinder part 102 and the third cylinder part 104. In addition, the cross-sectional shape of the lower part of the 1st cylinder part 106 is not limited to the box shape which has 2 times bending shape of FIG. 3, For example, it has cross-sectional shapes, such as U shape, Also good. For example, the refrigerant pipe 100 can be obtained by drilling a hole in the lower part of one cylindrical pipe and brazing or welding a box-shaped member covering the processed hole.

  The outer peripheral surface of the first cylindrical portion 106 is positioned such that the portion where the sludge capturing portion 110 of the first cylindrical portion 106 is formed is located radially outside the outer peripheral surfaces of the second cylindrical portion 102 and the third cylindrical portion 104. doing. That is, in the refrigerant pipe 100 of this embodiment, the portion where the sludge trapping portion 110 of the first cylindrical portion 106 is formed is more radially outward than the second cylindrical portion 102 and the third cylindrical portion 104. It has a swollen appearance. Therefore, in the refrigerant pipe 100 of the example of this embodiment, the sludge trapping portion 110 is directed downward by directing the swelled portion of the first cylindrical portion 106 downward in the direction of gravity.

  As described above, in this embodiment, at least a part of the pipe 50 that connects the refrigerant outlet side of the first heat exchanger 2 that functions as a condenser and the expansion device 3 has the sludge trapping part 110. It consists of The sludge trapping part 110 is lower than the inner peripheral surfaces of the second cylindrical part 102 and the third cylindrical part 104 of the first cylindrical part 106 connected between the second cylindrical part 102 and the third cylindrical part 104. It is a space that spreads out. That is, the first inner bottom portion 107 of the first tube portion 106 is recessed from the second inner bottom portion 103 of the second tube portion 102 and the third inner bottom portion 105 of the third tube portion 104. When the refrigerant including the sludge flows through the refrigerant pipe 100, the sludge contained in the refrigerant flows while sinking downward in the refrigerant pipe 100 and is captured by the sludge capturing unit 110. This is because the sludge contained in the refrigerant has a higher density than the refrigerant. According to this embodiment, the sludge contained in the refrigerant circulating in the refrigerant circuit can be reduced only by connecting the refrigerant pipe 100 between the first heat exchanger 2 and the expansion device 3. As a result, in this embodiment, with a simple configuration, the expansion device 3 may be clogged, the sliding portion of the compressor 1 may be worn, the piping may be worn, and the like.

  Furthermore, in this embodiment, the liquid refrigerant condensed in the first heat exchanger 2 is configured to flow into the refrigerant pipe 100. In the refrigerant circuit of the refrigeration cycle apparatus 10, since the flow of the refrigerant is slow in the portion where the liquid refrigerant flows, it is easy to separate the sludge from the refrigerant. Therefore, in this embodiment, the sludge capturing part 110 of the refrigerant pipe 100 can capture sludge efficiently.

  Furthermore, in this embodiment, the sludge trapping part 110 is provided in the first cylinder part 106 having an equivalent diameter larger than that of the second cylinder part 102 and the third cylinder part 104. Therefore, in the 1st cylinder part 106, since the flow of a refrigerant | coolant becomes slow, it is easy to isolate | separate sludge from a refrigerant | coolant. As a result, in this embodiment, the sludge trapping portion 110 formed in the first cylinder portion 106 of the refrigerant pipe 100 can trap sludge efficiently.

  Furthermore, in this embodiment, since the sludge trapping part 110 is provided below the first cylindrical part 106, even if sludge is accumulated in the sludge trapping part 110, the sludge of the first cylindrical part 106 is provided. Since the refrigerant flows above the capturing unit 110, the possibility that the refrigerant pipe 100 is clogged is suppressed.

  In addition, when the refrigerant | coolant which circulates through the refrigerating-cycle apparatus 10 contains the substance which has a double bond in molecular structure, said effect becomes still more remarkable. That is, the substance having a double bond may generate a solid polymer, and if the refrigerant containing the solid polymer circulates through the refrigeration cycle apparatus 10, the piping may be accelerated and the expansion device 3 may be clogged. There is a fear, and there is a risk of promoting wear of the sliding portion of the compressor 1. According to this embodiment, even when a solid polymer is generated, the sludge capturing unit 110 captures the solid polymer, so that the reliability of the refrigeration cycle apparatus 10 can be improved.

  This embodiment is not limited to the above example, and has a plurality of modified examples as will be described below. Note that, in the following description of the modified examples, the description overlapping with the above description is omitted.

[Modification 1]
FIG. 4 is a diagram schematically showing Modification 1 of Embodiment 1 which is a modification of FIG. Compared to the example of the first embodiment shown in FIG. 3, the refrigerant pipe 100A of the first modification shown in FIG. 4 is the width of the portion where the sludge trapping part 110A of the first cylindrical part 106A is formed, that is, the first The width of the inner bottom portion 107 </ b> A is narrower than that of the second cylindrical portion 102 and the third cylindrical portion 104. Therefore, in the modification 1, the freedom degree of the arrangement space which arrange | positions refrigerant | coolant piping 100A is improved.

[Modification 2]
FIG. 5 is a diagram schematically showing Modification 2 of Embodiment 1 which is a modification of FIG. Compared to the example of the first embodiment shown in FIG. 3, the refrigerant pipe 100B of the second modification shown in FIG. 5 is the width of the sludge trapping part 110B of the first cylinder part 106B, that is, the first inner bottom part 107B. The width is larger than the inner diameters of the second cylinder part 102 and the third cylinder part 104. Therefore, in the modified example 2, the accommodation amount in which the sludge capturing part 110B accommodates the sludge is increased. Furthermore, in Modification 2, since the equivalent diameter of the first cylinder portion 106B is large, the flow of the refrigerant flowing through the first cylinder portion 106B becomes slow, and it is easy to separate sludge from the refrigerant. Therefore, in the modification 3, the sludge trapping part 110B formed in the 1st cylinder part 106B of the refrigerant | coolant piping 100B can capture | acquire sludge efficiently.

[Modification 3]
FIG. 6 is a diagram schematically showing Modification 3 of Embodiment 1 which is a modification of FIG. Compared to the example of the first embodiment described in FIG. 2, the refrigerant pipe 100 </ b> C of the modified example 3 illustrated in FIG. 6 includes a first covering portion 112 </ b> A that covers the upper side of the sludge capturing portion 110 on the second cylinder portion 102 side. It has. The first cover portion 112 </ b> A protrudes from the second inner bottom portion 103 of the second cylinder portion 102 to above the first inner bottom portion 107 of the first cylinder portion 106 and covers the upper portion of the first inner bottom portion 107. In the modified example 3, since the first cover portion 112A covers the upper side of the sludge trapping portion 110 on the second cylinder portion 102 side, the sludge accumulated in the sludge trapping portion 110 is wound up by the flow of the refrigerant, and the sludge The possibility of flowing out from the capturing unit 110 is suppressed. Further, in the vicinity of the first cover portion 112A, the flow direction of the refrigerant changes, so that the stagnation of the refrigerant flow is likely to occur. Therefore, in the third modification, the sludge capturing unit 110 can capture sludge efficiently. Further, in the vicinity of the first cover portion 112A, stagnation occurs in the flow of the refrigerant, and the sludge having a large density and a large inertial force enters the sludge trapping portion 110 along the direction in which the refrigerant flows. Therefore, in the modification 3, the possibility that the sludge collected in the sludge trapping part 110 is wound up by the flow of the refrigerant and flows out of the sludge trapping part 110 is suppressed.

  The first cover portion 112 </ b> A is preferably a portion of the second cylinder portion 102 that protrudes above the sludge capturing portion 110. That is, the first cover portion 112 </ b> A is formed by projecting the second inner bottom portion 103 of the second cylinder portion 102 above the first inner bottom portion 107. By forming the first cover portion 112 </ b> A by causing the second tube portion 102 to protrude above the sludge capturing portion 110, a box-shaped member constituting the lower portion of the first tube portion 106 can be easily attached. The first cover portion 112 </ b> A may be a part of the first tube portion 106, or may be configured by the second tube portion 102 or another member attached to the first tube portion 106.

[Modification 4]
FIG. 7 is a diagram schematically showing Modification 4 of Embodiment 1, which is a modification of FIG. Compared to the third modification shown in FIG. 6, the refrigerant pipe 100 </ b> D of the fourth modification shown in FIG. 7 further includes a second cover part 112 </ b> B that covers the upper side of the sludge trapping part 110 on the third cylinder part 104 side. ing. That is, the refrigerant pipe 100D of Modification 4 includes a first cover portion 112A that covers the upper side of the sludge trapping portion 110 on the second tube portion 102 side and a second cover portion that covers the upper side of the sludge trapping portion 110 on the third tube portion 104 side. And a cover portion 112B. The second cover part 112 </ b> B protrudes from the third inner bottom part 105 of the third cylinder part 104 above the first inner bottom part 107 of the first cylinder part 106 and covers the upper part of the first inner bottom part 107. Therefore, in the modified example 4, even if the refrigerant pipe 100D is attached in the reverse direction, the sludge accumulated in the sludge trapping part 110 is wound up by the refrigerant flow and flows out of the sludge trapping part 110. The fear is suppressed.

  The second cover portion 112 </ b> B is preferably a portion of the third cylinder portion 104 that protrudes above the sludge capturing portion 110. That is, the second cover portion 112 </ b> B is formed by projecting the portion of the third inner bottom portion 105 of the third cylindrical portion 104 above the first inner bottom portion 107. By making the third cylindrical portion 104 protrude above the sludge capturing portion 110 to form the second cover portion 112B, a box-shaped member that forms the lower portion of the first cylindrical portion 106 can be easily attached. In addition, the 2nd cover part 112B may be a part of the 1st cylinder part 106, or may be comprised by the separate member attached to the 3rd cylinder part 104 or the 1st cylinder part 106. FIG.

[Modification 5]
FIG. 8 is a diagram schematically showing Modification 5 of Embodiment 1, which is a modification of FIG. Compared to the example of the first embodiment shown in FIG. 2, in the refrigerant pipe 100E of the modified example 5 shown in FIG. 8, the first cylindrical portion 106A is the first inner portion that is the inner bottom portion of the first cylindrical portion 106A. A plurality of partition walls 114 projecting upward from the bottom 107A are provided. In the modified example 5, the sludge trapping part 110 is divided into a plurality along the axial direction of the first cylinder part 106A, which is the direction in which the refrigerant flows, by the partition wall 114, and the sludge is trapped between the partition walls 114. . As a result, in the modified example 5, the possibility that the sludge accumulated in the sludge trapping part 110 is wound up by the flow of the refrigerant and flows out of the sludge trapping part 110 is reduced. The height of the partition wall 114 is appropriately determined. For example, as shown in FIG. 8, the height of the partition wall 114 is lower than the inner peripheral surfaces of the second cylinder portion 102 and the third cylinder portion 104. If formed, the flow rate of the refrigerant flowing through the first cylindrical portion 106A can be slowed down, so that sludge can be captured efficiently. Further, when the height of the partition wall 114 is formed higher than the inner peripheral surfaces of the second cylinder part 102 and the third cylinder part 104, the sludge accumulated in the sludge trapping part 110 is wound up by the flow of the refrigerant. Thus, the risk of flowing out of the sludge trapping part 110 can be reduced.

[Modification 6]
FIG. 9 is a diagram schematically showing Modification 6 of Embodiment 1, which is a modification of FIG. Compared to the example of the first embodiment shown in FIG. 2, in the modified example 6 of FIG. 9, the refrigerant pipe 100F has a linear shape in which the second cylindrical portion 102 and the first cylindrical portion 106B are linearly connected. And a bent shape portion in which the first cylindrical portion 106B and the third cylindrical portion 104A are connected in a bent shape. In the modified example 6, the first inner bottom portion 107B is located below the gravitational direction as compared with the second inner bottom portion 103, and a depressed space from the second inner bottom portion 103 to the first inner bottom portion 107 is The sludge trapping part 110 is configured. In Modification 3, when the refrigerant flows from the third cylinder portion 104A to the first cylinder portion 106B, the flow direction of the refrigerant changes, so the flow rate of the refrigerant becomes slow. Therefore, in the modified example 6, the sludge capturing part 110 of the first cylinder part 106B can capture sludge efficiently. Preferably, as shown in FIG. 9, the third cylindrical portion 104A is connected to the upper side of the first cylindrical portion 106B, and the refrigerant that has flowed down the third cylindrical portion 104A is directed to the first cylindrical portion 106B. And change to flow in a substantially horizontal direction. With this configuration, the sludge can be captured by the sludge capturing unit 110 by efficiently using gravity. This is because sludge has a higher density and inertial force than refrigerant, so when the flow of refrigerant containing sludge changes from downward to horizontal, the sludge is in the direction of gravity compared to refrigerant. Easy to go down.

[Modification 7]
FIG. 10 is a diagram schematically illustrating Modification Example 7 of Embodiment 1, which is a modification example of FIG. 2, and FIG. 11 is a diagram schematically illustrating a BB cross section of FIG. 10. In FIG. 11, in order to facilitate understanding of the modified example 7, the cross-sectional portion is indicated by a solid line, and the portion other than the cross-section is indicated by a dotted line. Compared to the example of the first embodiment described in FIGS. 2 and 3, in the modified example 7 illustrated in FIGS. 10 and 11, the first cylindrical portion 106 </ b> C is disposed on the entire circumference in the circumferential direction of the refrigerant pipe 100 </ b> G. The inner peripheral surface is located on the outer side in the radial direction from the inner peripheral surfaces of the second cylindrical portion 102 and the third cylindrical portion 104. In addition, on the entire circumference in the circumferential direction of the refrigerant pipe 100G, the outer peripheral surface of the first cylindrical portion 106C is located on the outer side in the radial direction with respect to the outer peripheral surfaces of the second cylindrical portion 102 and the third cylindrical portion 104. That is, the refrigerant pipe 100G of the modified example 7 has the first cylinder part 106C on the outer side in the radial direction compared to the second cylinder part 102 and the third cylinder part 104 on the entire circumference in the circumferential direction of the refrigerant pipe 100G. It has a swollen appearance. The cross-sectional shapes of the second cylindrical portion 102, the third cylindrical portion 104, and the first cylindrical portion 106C are not particularly limited, and may be rectangular or elliptical. As shown, when the cross-sectional shapes of the second cylindrical portion 102, the third cylindrical portion 104, and the first cylindrical portion 106C are circular, the second cylindrical portion 102, the third cylindrical portion 104, and the first cylindrical portion 106C Pressure resistance is improved. Moreover, when the 2nd cylinder part 102 and the 3rd cylinder part 104 have the same cross-sectional shape, the member which forms the 2nd cylinder part 102 and the 3rd cylinder part 104 can be shared.

  For example, the refrigerant pipe 100 </ b> G according to the modified example 7 has a first cylinder having a larger equivalent diameter between the second cylinder part 102 and the third cylinder part 104 than the second cylinder part 102 and the third cylinder part 104. The part 106C is obtained by brazing or welding. In the refrigerant pipe 100G of the modified example 7, the first inner bottom part 107C of the first cylinder part 106C is connected to the second inner bottom part 103 of the second cylinder part 102 no matter which part along the circumferential direction of the refrigerant pipe 100G faces downward. And since it will be located below the gravitational direction as compared with the third inner bottom portion 105 of the third cylinder portion 104, the workability when the refrigerant pipe 100G is attached is improved. Furthermore, in the refrigerant pipe 100G of the modified example 7, since the volume of the sludge capturing part 110C can be increased, sludge can be captured efficiently. In addition, the cross-sectional shape of the 2nd cylinder part 102, the 3rd cylinder part 104, and the 1st cylinder part 106C shall be circular, the central axis of the 2nd cylinder part 102, the central axis of the 3rd cylinder part 104, and the 1st cylinder part 106C. By substantially matching the central axis of the refrigerant pipe 100G, the refrigerant pipe 100G can exhibit an equivalent function regardless of which portion along the circumferential direction of the refrigerant pipe 100G faces downward.

[Modification 8]
FIG. 12 is a diagram schematically showing Modification 8 of Embodiment 1, which is a modification of FIG. Compared to the modified example 7 shown in FIG. 10, the refrigerant pipe 100H of the modified example 8 shown in FIG. 12 includes a first cover part 112C that covers the second cylinder part 102 side of the sludge trapping part 110C. The first cover portion 112C includes at least a portion that protrudes from the second inner bottom portion 103 of the second tube portion 102 above the first inner bottom portion 107C of the first tube portion 106C and covers the upper portion of the first inner bottom portion 107C. It is out. In Modification 8, since the first cover portion 112C covers the second cylinder portion 102 side of the sludge trapping portion 110C, the sludge accumulated in the sludge trapping portion 110C is wound up by the flow of the refrigerant, and the sludge trapping portion The possibility of flowing out from 110C is suppressed. Further, in the vicinity of the first cover portion 112C, the flow direction of the refrigerant changes, so that the stagnation of the refrigerant flow is likely to occur. Therefore, in the modification 8, 110 C of sludge capture | acquisition parts can capture | acquire sludge efficiently. Further, in the vicinity of the first cover portion 112C, stagnation occurs in the flow of the refrigerant, and the sludge having a large density and a large inertial force enters the back side of the sludge trapping portion 110C along the direction in which the refrigerant flows. Therefore, in the modification 8, the possibility that the sludge collected in the sludge trapping part 110C is wound up by the flow of the refrigerant and flows out of the sludge trapping part 110C is suppressed.

  The first covering portion 112C is preferably a portion of the second cylindrical portion 102 that protrudes toward the sludge capturing portion 110C. The first tube portion 106C can be easily attached to the second tube portion 102 by configuring the first cover portion 112 by projecting the second tube portion 102 into the first tube portion 106C. The first cover portion 112C may be a portion of the first tube portion 106C, or may be configured by another member attached to the second tube portion 102 or the first tube portion 106C.

[Modification 9]
FIG. 13 is a diagram schematically showing Modification 9 of Embodiment 1, which is a modification of FIG. Compared with the modification 8 shown in FIG. 12, the refrigerant | coolant piping 100I of the modification 9 shown in FIG. 13 is further provided with 2nd cover part 112D which covers the 3rd cylinder part 104 side of the sludge trapping part 110C. . That is, the refrigerant pipe 100I of Modification 9 includes a first cover portion 112C that covers the second cylinder portion 102 side of the sludge trapping portion 110C, and a second cover portion 112D that covers the third cylinder portion 104 side of the sludge trapping portion 110C. It is equipped with. The second cover portion 112D includes at least a portion that protrudes from the third inner bottom portion 105 of the third tube portion 104 to the upper side of the first inner bottom portion 107C of the first tube portion 106C and covers the upper portion of the first inner bottom portion 107C. It is out. Therefore, in the modified example 9, even if the refrigerant pipe 100I is attached in the reverse direction, the sludge accumulated in the sludge trapping part 110C is wound up by the flow of the refrigerant and flows out of the sludge trapping part 110C. The fear can be suppressed.

  The second cover portion 112D is, for example, a portion of the third cylinder portion 104 that protrudes toward the sludge capturing portion 110C. By projecting the third cylindrical portion 104 into the first cylindrical portion 106C to form the second cover portion 112D, the third cylindrical portion 104 can be easily attached to the first cylindrical portion 106C. Note that the second cover portion 112D may be a portion of the first cylinder portion 106C, or may be configured by the third cylinder portion 104 or another member attached to the first cylinder portion 106C.

[Modification 10]
FIG. 14 is a diagram schematically showing Modification 10 of Embodiment 1, which is a modification of FIG. Compared to the example of the first embodiment shown in FIG. 2, in the refrigerant pipe 100J of the modified example 10 shown in FIG. 14, the sludge trapping part 110D is lowered downward at the first angle θ1 from the second cylindrical part 102 side. A first inclined portion 116A that is inclined and a second inclined portion 116B that is inclined downward at a second angle θ2 that is smaller than the first angle θ1 from the third cylindrical portion 104 side are included. 116 A of 1st inclination parts incline below at the 1st angle (theta) 1 from the 2nd inner bottom part 103 of the 2nd cylinder part 102 to the 1st inner bottom part 107D of the 1st cylinder part 106D. The second inclined portion 116B is inclined downward from the third inner bottom portion 105 of the third cylindrical portion 104 to the first inner bottom portion 107D of the first cylindrical portion 106D at a second angle θ2 that is smaller than the first angle θ1. Yes. In the modified example 10, the inclination of the second inclined portion 116B on the side where the refrigerant flows into the first cylinder portion 106D is gentle, and the sludge flows smoothly into the sludge capturing portion 110D. The slope of the first inclined portion 116A on the side from which the refrigerant flows out of the first cylinder portion 106D is steep, and the flow of the refrigerant is easily stagnated. Therefore, in the modified example 10, the sludge capturing unit 110D can capture sludge efficiently.

[Modification 11]
FIG. 15 is a diagram schematically showing Modification 11 of Embodiment 1, which is a modification of FIG. Compared to the modified example 10 illustrated in FIG. 14, the refrigerant pipe 100K of the modified example 11 illustrated in FIG. 15 includes a first cover portion 112F that covers the upper side of the sludge capturing unit 110D on the second tube portion 102 side. Yes. The first cover portion 112F protrudes toward the third tube portion 104 from the bottom portion of the first inclined portion 116A. That is, the first cover portion 112F projects from the second inner bottom portion 103 of the second cylinder portion 102 to the upper side of the first inner bottom portion 107D of the first cylinder portion 106D and covers the upper portion of the first inner bottom portion 107D. . In Modification 11, since the first cover portion 112F covers the upper side of the sludge trapping portion 110D on the second tube portion 102 side, the sludge accumulated in the sludge trapping portion 110D is wound up by the flow of the refrigerant, and the sludge The possibility of flowing out from the capturing unit 110D is suppressed. Furthermore, since the direction of the refrigerant flow changes in the vicinity of the first cover portion 112F, it is easy for stagnation to occur in the refrigerant flow. Therefore, in the modified example 11, the sludge capturing part 110D can capture sludge efficiently. Further, in the vicinity of the first cover portion 112F, stagnation occurs in the flow of the refrigerant, and the sludge having a large density and a large inertial force enters the back side of the sludge trapping portion 110D along the flow direction of the refrigerant. Therefore, in the modification 3, the possibility that the sludge collected in the sludge trapping part 110D is wound up by the flow of the refrigerant and flows out of the sludge trapping part 110D is suppressed.

  The first covering portion 112F is preferably a portion of the second cylindrical portion 102 that protrudes above the sludge capturing portion 110D. That is, the first cover portion 112F is formed by projecting the second inner bottom portion 103 of the second cylinder portion 102 above the first inner bottom portion 107D. By making the second cylinder portion 102 protrude above the sludge capturing portion 110D to form the first cover portion 112F, a box-shaped member constituting the lower portion of the first cylinder portion 106D can be easily attached. In addition, the 1st cover part 112F may be a part of 1st cylinder part 106D, or may be comprised by the separate member attached to the 2nd cylinder part 102 or 1st cylinder part 106D.

[Modification 12]
FIG. 16 is a diagram schematically showing Modification 12 of Embodiment 1, which is a modification of FIG. Compared with the modification example 7 shown in FIG. 10, in the modification example 12 shown in FIG. 16, the sludge trapping part 110E is inclined first in the inner diameter direction at the first angle θ1 from the second cylindrical part 102 side. 116C and 2nd inclination part 116D which inclines in the internal diameter direction at 2nd angle (theta) 2 of an angle smaller than 1st angle (theta) 1 from the 3rd cylinder part 104 side. In the modified example 12, the inclination of the second inclined portion 116D on the side where the refrigerant flows into the first cylindrical portion 106E is gentle, and the sludge flows smoothly into the sludge capturing portion 110E. Then, the inclination of the first inclined portion 116C on the side from which the refrigerant flows out from the first cylinder portion 106E is steep, and the flow of the refrigerant is easily stagnated. Therefore, in the modified example 12, the sludge capturing part 110E can capture sludge efficiently.

  For example, the refrigerant pipe 100 </ b> L of the modified example 12 has a larger equivalent diameter between the second cylinder portion 102 and the third cylinder portion 104 than the second cylinder portion 102 and the third cylinder portion 104. It can be obtained by brazing or welding fixing the first cylindrical portion 106E formed with an inclination. The first cylindrical portion 106E is obtained by, for example, performing a drawing process in which both sides of a cylindrical member are processed to be thin, so that the productivity of the modified example 12 is improved.

[Modification 13]
FIG. 17 is a diagram schematically showing Modification 13 of Embodiment 1, which is a modification of FIG. Compared with the modification 12 shown in FIG. 16, the refrigerant | coolant piping 100M of the modification 13 shown in FIG. 17 is provided with the 1st cover part 112G which covers the 2nd cylinder part 102 side of the sludge trapping part 110E. The first cover portion 112G includes at least a portion that protrudes above the first inner bottom portion 107E of the first tube portion 106E from the second inner bottom portion 103 of the second tube portion 102 and covers the upper portion of the first inner bottom portion 107E. It is out. In Modification 13, since the first cover portion 112G covers the second cylinder portion 102 side of the sludge trapping portion 110E, the sludge accumulated in the sludge trapping portion 110E is wound up by the flow of the refrigerant, and the sludge trapping portion The possibility of flowing out from 110E is suppressed. Further, in the vicinity of the first cover portion 112G, the flow direction of the refrigerant changes, so that the stagnation of the refrigerant flow is likely to occur. Therefore, in the modified example 13, the sludge capturing part 110E can capture sludge efficiently. Further, in the vicinity of the first cover portion 112G, stagnation occurs in the flow of the refrigerant, and the sludge having a large density and a large inertial force enters the back side of the sludge trapping portion 110E along the direction in which the refrigerant flows. Therefore, in the modified example 13, the possibility that the sludge accumulated in the sludge trapping part 110E is wound up by the flow of the refrigerant and flows out of the sludge trapping part 110E is suppressed. The first cover portion 112G is preferably a portion of the second cylinder portion 102 that protrudes above the sludge capturing portion 110E. The first cylinder part 106E can be easily attached to the second cylinder part 102 by projecting the second cylinder part 102 above the sludge capturing part 110E to form the first cover part 112G. Note that the first cover portion 112G may be a portion of the first tube portion 106E, or may be configured by another member attached to the second tube portion 102 or the first tube portion 106E.

Embodiment 2. FIG.
FIG. 18 is a diagram schematically illustrating an example of the refrigerant circuit of the refrigeration cycle apparatus according to Embodiment 2 of the present invention. Compared with the refrigeration cycle apparatus 10 according to the first embodiment illustrated in FIG. 1, the refrigeration cycle apparatus 10A according to the second embodiment illustrated in FIG. The flow path switching device 5 switches the direction of the refrigerant flowing through the refrigeration cycle apparatus 10A, and is configured by, for example, a four-way valve. The flow path switching device 5 causes the first heat exchanger 2 to function as an evaporator and the second heat exchanger 4 to function as a condenser, and causes the first heat exchanger 2 to function as a condenser. And it switches the 2nd operation mode which makes the 2nd heat exchanger 4 function as an evaporator. In the example shown in FIG. 18, the flow path switching device 5 connects the refrigerant suction side of the compressor 1 and the first heat exchanger 2 and connects the refrigerant discharge side of the compressor 1 and the second heat exchanger 4. The refrigeration cycle apparatus 10A is in the first operation mode in which the first heat exchanger 2 functions as an evaporator and the second heat exchanger 4 functions as a condenser. The flow path switching device 5 is switched to a setting for connecting the refrigerant discharge side of the compressor 1 and the first heat exchanger 2 and connecting the refrigerant suction side of the compressor 1 and the second heat exchanger 4. Then, the refrigeration cycle apparatus 10A is in the second operation mode in which the first heat exchanger 2 functions as a condenser and the second heat exchanger 4 functions as an evaporator.

  The refrigeration cycle apparatus 10A of this embodiment includes a first operation mode in which the second heat exchanger 4 functions as a condenser, and a second operation mode in which the first heat exchanger 2 functions as a condenser. . Therefore, in this embodiment, the refrigerant pipe 100 is connected between the first heat exchanger 2 and the expansion device 3 and between the second heat exchanger 4 and the expansion device 3. In the refrigeration cycle apparatus 10A of this embodiment, the refrigerant pipe 100 disposed on the first heat exchanger 2 side and the second heat exchanger 4 side of the expansion device 3 captures the sludge and serves as the refrigerant. Since the contained sludge can be reduced, the reliability of the refrigeration cycle apparatus 10A can be improved.

  As the refrigerant pipe applied to the refrigeration cycle apparatus 10A of the second embodiment, any one of the refrigerant pipes 100 of the first embodiment and the modified example of the first embodiment may be selected. The refrigerant pipe 100 of the example of the first embodiment shown in FIG. 2 and FIG. 3, the refrigerant pipe 100A of the modified example 1 shown in FIG. 4, which exhibits the same function regardless of the direction of the refrigerant flow, FIG. Refrigerant piping 100B of Modification 2 described, refrigerant piping 100D of Modification 4 described in FIG. 7, refrigerant piping 100E of Modification 5 described in FIG. 8, refrigerant piping of Modification 7 described in FIGS. 10 and 11 One of 100G and the refrigerant pipe 100I of the modified example 9 illustrated in FIG. 13 may be selected. In particular, when the refrigerant pipe 100D of the modified example 4 illustrated in FIG. 7 or the refrigerant pipe 100I of the modified example 9 illustrated in FIG. 13 including the first cover part and the second cover part is selected, the refrigerant Even when the flow direction changes, the first cover portion and the second cover portion suppress the outflow of sludge, so that the reliability of the refrigeration cycle apparatus 10A can be improved.

  The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the present invention. That is, the configuration of the above embodiment may be improved as appropriate, or at least a part of the configuration may be replaced with another configuration. Furthermore, the constituent elements that are not particularly limited with respect to the arrangement are not limited to the arrangement disclosed in the embodiment, and can be arranged at positions where the functions can be achieved.

  For example, a plurality of refrigerant pipes including a sludge trapping part may be connected between the refrigerant outlet side of the heat exchanger functioning as a condenser and the expansion device. By capturing the sludge with a plurality of refrigerant pipes, the sludge contained in the refrigerant can be reduced, so that the reliability of the refrigeration cycle apparatus can be improved.

  DESCRIPTION OF SYMBOLS 1 Compressor, 2 1st heat exchanger, 3 Expansion apparatus, 4 2nd heat exchanger, 5 Flow path switching apparatus, 10 Refrigeration cycle apparatus, 10A Refrigeration cycle apparatus, 50 piping, 100 Refrigerant piping, 100A Refrigerant piping, 100B Refrigerant piping, 100C refrigerant piping, 100D refrigerant piping, 100E refrigerant piping, 100F refrigerant piping, 100G refrigerant piping, 100H refrigerant piping, 100I refrigerant piping, 100J refrigerant piping, 100K refrigerant piping, 100L refrigerant piping, 100M refrigerant piping, 102 2nd Tube portion, 103 Second inner bottom portion, 104 Third tube portion, 104A Third tube portion, 105 Third inner bottom portion, 106 First tube portion, 106A First tube portion, 106B First tube portion, 106C First tube portion 106D 1st cylinder part, 106E 1st cylinder part, 107 1st inner bottom part, 107A 1st inner bottom part, 107B 1st Bottom portion, 107C first inner bottom portion, 107D first inner bottom portion, 107E first inner bottom portion, 110 sludge trapping portion, 110A sludge trapping portion, 110B sludge trapping portion, 110C sludge trapping portion, 110D sludge trapping portion, 110E sludge trapping portion, 112 1st cover part, 112A 1st cover part, 112B 2nd cover part, 112C 1st cover part, 112D 2nd cover part, 112F 1st cover part, 112G 1st cover part, 114 partition, 116A 1st inclination part , 116B second inclined portion, 116C first inclined portion, 116D second inclined portion, θ1 first angle, θ2 second angle.

Claims (11)

A refrigerant circuit in which the refrigerant circulates,
The refrigerant circuit includes a condenser, an expansion device, and a refrigerant pipe connecting the condenser and the expansion device.
The refrigerant pipe includes a first bottom portion, a second bottom portion, and a third bottom portion, and the second bottom portion is located between the first bottom portion and the expansion device, and the third bottom portion is Located between the first bottom and the condenser, the first bottom, the second bottom and the third bottom constitute a bottom of the refrigerant pipe,
The refrigerant pipe may include a first inclined portion inclined downward at a first angle from the second bottom portion to the first bottom, the second the third the first angle smaller angle than the bottom portion to the first bottom part A refrigeration cycle apparatus including a second inclined portion inclined downward at an angle. The refrigerant pipe includes a first tube portion including the first bottom portion, a second tube portion including the second bottom portion and connected between the first tube portion and the expansion device, and the first tube portion. And a third cylinder connected between the condenser and the condenser,
The equivalent diameter of the first cylinder part is larger than the equivalent diameters of the second cylinder part and the third cylinder part,
The refrigeration cycle apparatus according to claim 1. The inner peripheral surface of the first cylindrical portion protrudes outward in the radial direction over the entire periphery, compared to the inner peripheral surfaces of the second cylindrical portion and the third cylindrical portion.
The refrigeration cycle apparatus according to claim 2. The refrigerant pipe has a linear shape in which the first cylinder part, the second cylinder part, and the third cylinder part are linearly connected.
The refrigeration cycle apparatus according to claim 2 or claim 3. The central axis of the first cylindrical portion, the central axis of the second cylindrical portion, and the central axis of the third cylindrical portion substantially match.
The refrigeration cycle apparatus according to claim 4. The cross-sectional shape of the second cylindrical portion and the cross-sectional shape of the third cylindrical portion are the same.
The refrigeration cycle apparatus according to any one of claims 2 to 5. The first cylinder part, the second cylinder part, and the third cylinder part have a circular cross-sectional shape,
The refrigeration cycle apparatus according to any one of claims 2 to 6. The refrigerant pipe protrudes from the second bottom portion above the first bottom portion and has a first cover portion that covers a part of the upper portion of the first bottom portion.
The refrigeration cycle apparatus according to any one of claims 1 to 7. The refrigerant pipe has a second cover portion that protrudes from the third bottom portion above the first bottom portion and covers a part of the upper portion of the first bottom portion.
The refrigeration cycle apparatus according to claim 1. Having a partition wall protruding upward from the first bottom,
The refrigeration cycle apparatus according to any one of claims 1 to 9 . A refrigerant containing a substance having a double bond circulates;
The refrigeration cycle apparatus according to any one of claims 1 to 10 .

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