Refrigerant distributor, heat exchanger and refrigeration cycle unit

Abstract

One embodiment of a refrigerant distributor that distributes a refrigerant according to the present disclosure includes: a first conduit; and a second conduit connected to the first conduit. The second conduit has a pair of parallel conduits extending in the first direction and arranged in a second direction intersecting with the first direction with intervals therebetween, and has a coupling conduit connecting ends in the first direction of the pair of parallel conduits. The first conduit has a first extension conduit extending in the second direction, a second extension conduit bending and extending from the first extension conduit, and a third extension conduit bending and extending from the second extension conduit in the second direction, and connected to one of the pair of parallel conduits.The second extension line bends to one side relative to the first extension line in a direction that is orthogonal to both the first direction and the second direction.

Description

Technical area

[0001] The present disclosure relates to a refrigerant distributor, a heat exchanger and a refrigeration cycle device. Technological background

[0002] A structure in which a refrigerant is distributed and supplied to multiple heat transfer lines of a heat exchanger is known. For example, Patent Document 1 discloses an air conditioner having such a structure. Citation listPatent documents

[0003] [Patent Document 1] PCT International Publication No. WO 2014 / 199 501 Brief description of the inventionProblem to be solved by the invention

[0004] In a structure such as the one above, in which a refrigerant is distributed, a pipe is provided with a curved portion on the upstream side of a portion that distributes the refrigerant to allow the refrigerant to avoid elements such as other pipes or the like. In such a case, it is easy for the refrigerant to incline toward the interior of the pipe due to inertia after passing through the curved portion. As a result, an imbalance occurs in the amount of refrigerant distributed among several heat transfer pipes, and there are cases where heat exchange efficiency decreases.

[0005] The present disclosure has been made in view of the above problem, and it is an object thereof to provide a refrigerant distributor having a structure capable of preventing an imbalance in an amount of a distributed refrigerant from occurring, a heat exchanger including such a refrigerant distributor, and a refrigeration cycle device including such a heat exchanger. Means to solve the problem

[0006] One embodiment of a refrigerant distributor that distributes a refrigerant according to the present disclosure includes: a first conduit; and a second conduit connected to the first conduit. The second conduit has a pair of parallel conduits extending in the first direction and arranged with intervals therebetween in a second direction that intersects the first direction, and has a coupling conduit that connects ends in the first direction of the pair of parallel conduits to each other.The first line has a first extension line extending in the second direction, a second extension line bending and extending from the first extension line, a third extension line bending and extending from the second extension line to the second direction and connecting to one of the pair of parallel lines, and the second extension line bends to one side with respect to the first extension line in a direction orthogonal to both the first direction and the second direction.

[0007] One embodiment of a refrigerant distributor that distributes a refrigerant according to the present disclosure includes: a first conduit and a second conduit connected to the first conduit. The second conduit has a pair of parallel conduits extending in the first direction and arranged with intervals therebetween in a second direction that intersects the first direction, and has a coupling conduit that connects ends in the first direction of the pair of parallel conduits to each other.The first line has a first extension line, a second extension line extending and curving from the first extension line, and a third extension line curving and extending from the second extension line to the second direction and connecting to one of the pair of parallel lines, wherein a length of the third extension line is greater than or equal to ten times an inner diameter of the third extension line.

[0008] One embodiment of a heat exchanger according to the present disclosure includes: the aforementioned refrigerant distributor, a plurality of heat transfer lines, and a plurality of fins connected to the heat transfer lines. Each of the pair of parallel lines is connected to a different heat transfer line among the plurality of heat transfer lines.

[0009] An embodiment of a refrigeration cycle device according to the present disclosure includes the above-mentioned heat exchanger. Effects of the invention

[0010] According to the present disclosure, it is possible to prevent an imbalance of an amount of refrigerant distributed by a refrigerant distributor from occurring. Short description of drawings Fig. 1 is a schematic diagram showing a concept of a refrigeration cycle device according to a first embodiment. Fig. 2 is a schematic diagram showing a heat exchanger of an outdoor unit in the first embodiment. Fig. 3 is a view showing a portion of the heat exchanger of the outdoor unit in the first embodiment, viewed from a front-to-rear direction. Fig. 4 is a perspective view showing a portion of the heat exchanger of the outdoor unit according to the first embodiment. Fig. 5 is a view showing a portion of a refrigerant distributor in the first embodiment, viewed from the left-right direction. Fig. 6 is a view showing a portion of the refrigerant distributor in a second embodiment, viewed from the left-right direction. Fig. 7 is a view showing a portion of the refrigerant distributor in a third embodiment, viewed from the left-right direction. Fig. 8 is a view showing a portion of the refrigerant distributor in a fourth embodiment, viewed from a front-to-rear direction. Fig. 9 is a view showing a portion of the refrigerant distributor in the fourth embodiment, viewed from the left-right direction. Fig. 10 is a cross-sectional view showing a comparative example of a portion of a refrigerant distributor. Description of embodiments

[0011] Embodiments of the present disclosure will be described below with reference to the drawings. The scope of the present disclosure is not limited to the following embodiments, and embodiments may be modified as long as the embodiments do not deviate from the technical content of the present disclosure. In the following drawings, scales and dimensions of different configurations may differ from actual scales and dimensions to facilitate a better understanding of the various embodiments.

[0012] The drawings show an X-axis, a Y-axis, and a Z-axis where appropriate. The X-axis indicates one side of the sides in a horizontal direction. The Y-axis indicates another side of the sides in the horizontal direction. The Z-axis indicates a vertical direction. In the following explanation, a horizontal direction along the X-axis is referred to as a "front-back direction X," and a horizontal direction along the Y-axis is referred to as a "left-right direction Y." A vertical direction along the Z-axis is referred to as a "vertical direction Z." The front-back direction X, the left-right direction Y, and the vertical direction Z are mutually orthogonal directions. In the following explanation, a side of the sides in the vertical direction Z in which the arrow faces the Z-axis is a "top" (+Z side) in the vertical direction Z.The other side of the sides in the vertical direction Z, which faces a side opposite to the side facing the Z-axis arrow, is a "bottom side" (-Z side) in the vertical direction Z. A side of the sides in the front-rear direction X, in which the arrow faces the X-axis, is a "front side" (+X side). The other side of the sides in the front-rear direction X, which faces a side opposite to the side in which the arrow faces the X-axis, is a "rear side" (-X side). The left-right direction Y refers to the left-right direction when the outdoor unit is viewed from the front (+X direction) in the following embodiments. In other words, a side of the left-right direction Y, to which the Y-axis arrow faces, is a "right side" (+Y side).The other side of the sides of the left-right direction Y, which faces a side opposite to a side to which the arrow of the Y-axis faces, is a "left side" (-Y side).

[0013] In the following embodiments, the left-right direction Y corresponds to a "first direction." The vertical direction Z corresponds to a "second direction" that intersects the first direction. The front-back direction X is a direction orthogonal to both the first direction and the second direction. First embodiment

[0014] Fig. Fig. 1 is a schematic diagram showing a concept of a refrigeration cycle device 100 in a first embodiment. The refrigeration cycle device 100 is a device that uses a refrigeration cycle in which a refrigerant 19 circulates. The refrigeration cycle device 100 in the first embodiment is an air conditioner. As shown in Fig. As shown in Figure 1, the refrigeration cycle device 100 includes an outdoor unit 10, an indoor unit 20, and a circulation path 18. The outdoor unit 10 is located outdoors. The indoor unit 20 is located indoors. The outdoor unit 10 and the indoor unit 20 are connected to each other using the circulation path 18, which circulates the refrigerant 19. The outdoor unit 10 and the indoor unit 20 are heat exchange units that perform heat exchange with air.

[0015] By having the refrigerant 19 flowing in the circulation path 18 and the indoor unit 20 performing heat exchange with the air in the interior, the refrigeration cycle device 100 can adjust the temperature of the air in the interior. A refrigerant such as a fluorine-based refrigerant with a low global warming potential (GWP) or a hydrocarbon-based refrigerant, or the like, can be cited as examples of the refrigerant 19.

[0016] The outdoor unit 10 includes a housing 11, a compressor 12, a heat exchanger 13, a flow adjustment valve 14, a blower 15, a four-way valve 16, and a controller 17. The compressor 12, the heat exchanger 13, the flow adjustment valve 14, the blower 15, the four-way valve 16, and the controller 17 are housed inside the housing 11.

[0017] The compressor 12, the heat exchanger 13, the flow adjustment valve 14, and the four-way valve 16 are provided at a portion of the circulation path 18 located inside the housing 11. The compressor 12, the heat exchanger 13, the flow adjustment valve 14, and the four-way valve 16 are connected to the portion of the circulation path 18 located inside the housing 11.

[0018] The four-way valve 16 is provided in a portion of the circulation path 18 connected to a discharge side of the compressor 12. By switching a portion of the circulation path 18, it is possible for the four-way valve 16 to reverse a flow direction of the refrigerant 19 inside the circulation path 18. If the path of the four-way valve 16 connected by the four-way valve 16 is the one shown in Fig. 1 by a solid line, the refrigerant 19 flows inside the circulation path 18 in the direction shown in Fig. 1 is shown by a solid arrow. Otherwise, if the path connected by the four-way valve 16 is the path of the four-way valve 16 that is in Fig. 1 by dashed line, the refrigerant 19 flows inside the circulation path 18 in the direction shown in Fig. 1 is shown by a dashed arrow.

[0019] The indoor unit 20 includes a casing 21, a heat exchanger 22, and a fan 23. The casing 21 houses the heat exchanger 22 and the fan 23 inside. The indoor unit 20 is capable of performing a cooling operation, which cools the air inside the room in which the indoor unit 20 is installed, and a heating operation, which heats the air inside the room in which the indoor unit 20 is installed.

[0020] When the indoor unit 20 is operated in the cooling mode, refrigerant 19 flowing into the circulation path 18 flows into the Fig. 1. In other words, the refrigerant 19 flowing in the circulation path 18 when the indoor unit 20 is operating in the cooling mode circulates so as to return to the compressor 12 after passing through the compressor 12, the heat exchanger 13 of the outdoor unit 10, the flow adjustment valve 14, and the heat exchanger 22 of the indoor unit 20 in this order. During the cooling operation, the heat exchanger 13 inside the outdoor unit 10 functions as a condenser, and the heat exchanger 22 inside the indoor unit 20 functions as an evaporator.

[0021] Otherwise, when the indoor unit 20 is operated in the heating mode, the refrigerant 19 flowing inside the circulation path 18 flows into the Fig. 1. In other words, the refrigerant 19 flowing inside the circulation path 18 when the indoor unit 20 is operating in the heating mode circulates so as to return to the compressor 12 after passing through the compressor 12, the heat exchanger 22 of the indoor unit 20, the flow adjustment valve 14, and the heat exchanger 13 of the outdoor unit 10 in this order. During the heating operation, the heat exchanger 13 inside the outdoor unit 10 functions as an evaporator, and the heat exchanger 22 inside the indoor unit 20 functions as a condenser.

[0022] The outdoor unit 10 of the present embodiment will be explained in further detail. Fig. 2 is a schematic view showing the heat exchanger 13 of the outdoor unit 10. Fig. 3 is a view showing a portion of the heat exchanger 13 of the outdoor unit 10, viewed from the front-rear direction X. Fig. 4 is a perspective view showing a portion of the heat exchanger 13 of the outdoor unit 10.

[0023] As in Fig. 2 and Fig. 4, the heat exchanger 13 of the outdoor unit 10 includes a heat exchanger main body 13c. The heat exchanger main body 13c has a plurality of heat transfer lines 13a and a plurality of fins 13b. The plurality of heat transfer lines 13a extend in the left-right direction Y in the first embodiment. The plurality of heat transfer lines 13a are, for example, cylindrical lines. In the first embodiment, an array of the plurality of heat transfer lines 13a, which are arranged with intervals therebetween in the vertical direction Z, is arranged in two rows in the front-back direction X. A part of the heat transfer lines 13a are arranged in Fig. 3 and Fig. 4 omitted from the drawings.

[0024] The plurality of fins 13b are connected to the plurality of heat transfer lines 13a. In the first embodiment, plate surfaces of the plurality of fins 13b are elongated rectangular shapes facing the left-right direction Y and are longer in the vertical direction Z. The plurality of fins 13b are arranged to be aligned in the left-right direction Y. Although omitted from the drawings, a narrow gap is provided between each of the plurality of fins 13b adjacent to each other. Each fin 13b of the plurality of fins 13b has a through-hole through which each heat transfer line 13a of the plurality of heat transfer lines 13a passes in the left-right direction Y. Outer peripheral surfaces of the heat transfer lines 13a passing through these through-holes are fixed to inner peripheries of these through-holes.

[0025] As in Fig. 2, the heat exchanger 13 includes two bends 51 and 52 that connect two heat transfer lines 13a. The bend 51 is a portion that connects the heat transfer lines 13a adjacent to each other in the two rows in the front-to-back direction X. The bend 52 is a portion that connects the heat transfer lines 13a adjacent to each other in the vertical direction Z. A plurality of bends 51 and 52 are provided, respectively. Each bend of the bends 51 and 52 is, for example, a U-shaped pipe. The bends 51 and 52 may be separate bodies from the heat transfer lines 13a, such as fittings, or may be integrally formed with the heat transfer lines 13a.

[0026] The heat exchanger 13 comprises a first distributor 41 and a second distributor 42. The first distributor 41 has several lines 41a. In the example of Fig. 2, six of the lines 41a are provided. Each line 41a of the plurality of lines 41a is connected to a respective heat transfer line 13a of the plurality of heat transfer lines 13a arranged at the top in the vertical direction Z. A line 18a connecting the heat exchanger 13 and the four-way valve 16 is connected to the first manifold 41.

[0027] When the indoor unit 20 is operated in the cooling mode, refrigerant 19 flowing from the conduit 18a to the first manifold 41 branches and flows to the plurality of conduits 41a, and flows to an interior of each of the heat transfer conduits 13a connected to each of the conduits 41a. The refrigerant 19 flowing from each of the conduits 41a to an interior of each of the heat transfer conduits 13a in the first embodiment flows to another of the heat transfer conduits 13a via one of the conduit elbows 52, and then flows to another of the heat transfer conduits 13a via one of the conduit elbows 51, and then flows to another of the heat transfer conduits 13a via one of the conduit elbows 52. The latter continues to flow to another of the heat transfer lines 13a until the refrigerant 19 flows to a refrigerant distributor 30 to be mentioned below.

[0028] The second distributor 42 has several lines 42a. In the example of Fig. 2, three of the lines 42a are provided. A respective line 42a of the plurality of lines 42a is connected to a respective one of the heat transfer lines 13a located at the bottom of the plurality of heat transfer lines 13a in the vertical direction Z. A line 18b connecting the heat exchanger 13 and the flow adjustment valve 14 is connected to the second manifold 42.

[0029] When the indoor unit 20 is operated in the heating mode, the refrigerant 19 flowing through the conduit 18b to the second manifold 42 branches and flows to the plurality of conduits 42a, and flows to an interior of each of the heat transfer conduits 13a connected to each of the conduits 42a. In the first embodiment, the refrigerant 19 flowing from each of the conduits 42a into the interior of each of the heat transfer conduits 13a flows via one of the conduit bends 52 to another of the heat transfer conduits 13a, then flows via another of the conduit bends 51 to another of the heat transfer conduits 13a, and then flows via another of the conduit bends 52 to another of the heat transfer conduits 13a. The latter continues to flow to another of the heat transfer lines 13a until the refrigerant 19 flows to the later-mentioned refrigerant distributor 30.

[0030] The heat exchanger 13 includes the refrigerant distributor 30, which distributes the refrigerant 19. The refrigerant distributor 30 is connected in the first embodiment via a respective one of the plurality of heat transfer lines 13a to the first distributor 41 and the second distributor 42. The refrigerant 19, which flows from the first distributor 41 to the plurality of heat transfer lines 13a, flows via the refrigerant distributor 30 to the second distributor 42. The refrigerant 19, which flows from the second distributor 42 to the plurality of heat transfer lines 13a, then flows via the refrigerant distributor 30 to the first distributor 41. In the first embodiment, a plurality of refrigerant distributors 30 are provided. In the example of Fig. 2, three of the refrigerant distributors 30 are provided.

[0031] As in Fig. 3 and Fig. 4, the refrigerant distributor 30 in the first embodiment is arranged on the right side (+Y side) of the heat exchanger main body 13c. Fig. 5 is a view showing a part of the refrigerant distributor 30, seen from the left-right direction Y. As in Fig. 3 and Fig. 5, the refrigerant distributor 30 comprises a first line 31 and a second line 32 connected to the first line 31.

[0032] In the first embodiment, the first conduit 31 is a conduit connecting one of the heat transfer conduits 13a and the second conduit 32. The first conduit 31 is, for example, a cylindrical conduit. As shown in Fig. 3, the first line 31 has a connecting line 31a, a first extension line 31b, a second extension line 31c and a third extension line 31d.

[0033] The connecting pipe 31a extends in the left-right direction Y. The connecting pipe 31a is connected to a portion of the heat transfer pipe 13a in the left-right direction Y, which is located relatively lower among the plurality of heat transfer pipes 13a. In other words, in the first embodiment, the "other member" connected to the connecting pipe 31 is the heat transfer pipe 13a. One end of a side at which the heat transfer pipe 13a is connected to the connecting pipe 31a is the end on a side opposite to an end of a side at which the second pipe 32 is connected to the first pipe 31. The connecting pipe 31a extends in a straight line to the right side from an end on the right side (+Y side) of the heat transfer pipe 13a. The connecting pipe 31a extends in a direction parallel to the left-right direction Y in the first embodiment.

[0034] The first extension line 31b extends in the vertical direction Z. The first extension line 31b, in the first embodiment, extends from an end on the right side of the connecting line 31a in a straight line to the top side. Another line may be provided between the connecting line 31a and the first extension line 31b, and this other line does not need to have a particular shape. For example, this other line may extend from the end on the right side of the connecting line 31a diagonally to the top side in a direction that increases with respect to the vertical direction Z to the horizontal direction. When this other line is provided, the first extension line 31b extends from an end on the side opposite to the side to which the connecting line 31a is connected, from this other line to the top side.

[0035] The first extension line 31b bends and extends from the connecting line 31a to the top. In other words, a line bend 33a is formed between the connecting line 31a and the first extension line 31b. In the first embodiment, the line bend 33a is a connecting portion between the connecting line 31a and the first extension line 31b. In the first embodiment, a bend angle θ3 of the line bend 33a is 90 degrees. The bend angle θ3 is a bend angle of the first extension line 31b relative to the connecting line 31a. The bend angle θ3 is not particularly limited and can be any angle other than 90 degrees.

[0036] In the present disclosure, the term "a bend angle of a particular wire with respect to another wire" refers to the degree to which the other wire is bent when connected to a particular wire. In other words, the larger the bend angle, the more the other wire is bent with respect to a particular wire. A state in which the other wire is not bent with respect to a particular wire and in which the other wire extends in the direction in which the particular wire extends is a state in which the bend angle is 0 degrees.

[0037] The second extension line 31c is connected to one end at the top of the first extension line 31b. As shown in Fig. 4 and Fig. As shown in FIG. 5, the second extension line 31c bends and extends from the first extension line 31b. The second extension line 31c bends to a side in the front-back direction -X, which is orthogonal to both the left-right direction Y and the vertical direction Z, with respect to the first extension line 31b; in other words, it bends toward the back (-X side). In the first embodiment, the second extension line 31c is diagonally inclined and extends in a straight line with respect to the vertical direction Z and the front-back direction X. The second extension line 31c is arranged from the end at the top of the first extension line 31b, the further to a back as it approaches the top.

[0038] A pipe bend 33b is a connecting portion of the first extension pipe 31b and the second extension pipe 31c. In the first embodiment, a curvature angle θ1a of the pipe bend 33b is an acute angle. The curvature angle θ1a is the curvature angle of the second extension pipe 31c relative to the first extension pipe 31b.

[0039] The third extension line 31d is connected to one end at the top and the back (-X side) of the second extension line 31c. The third extension line 31d extends in a straight line to the top, from one end at the top and the back of the second extension line 31c. In other words, the third extension line 31d curves and extends from the second extension line 31c in the vertical direction Z. The third extension line 31d curves toward the top with respect to the second extension line 31c. One end at the top of the third extension line 31d is one end at the top of the first line 31b, and is connected to the second line 32. The third extension line 31d is arranged so as to be offset from the first extension line 31b, as viewed from the vertical direction Z.In the first embodiment, the third extension line 31d is arranged at a location offset in the front-to-rear direction X with respect to the first extension line 31b. The third extension line 31d is arranged further back (-X direction) than the first extension line 31b.

[0040] A connecting part of the second extension line 31c and the third extension line 31d is a pipe bend 33c. In the first embodiment, a bend angle θ2a of the pipe bend 33c is an acute angle. The bend angle θ2a is a bend angle of the third extension line 31d relative to the second extension line 31c. In the first embodiment, the bend angle θ1a and the bend angle θ2a are the same angle. However, the bend angle θ1a and the bend angle θ2a may be different from each other.

[0041] In the first embodiment, a length L1b of the first extension line 31b is greater than a length of the second extension line 31c and a length L1d of the third extension line 31d. The length L1b of the first extension line 31b is greater than or equal to ten times an inner diameter Db of the first extension line 31b. The length L1d of the third extension line 31d is greater than the length of the second extension line 31c. The length L1d of the third extension line 31d is greater than or equal to ten times an inner diameter Dd of the third extension line 31d. Lengths of each of the extension lines are dimensions of each of the extension lines in directions in which the respective extension lines extend. In other words, the length L1b of the first extension line 31b is a dimension in the vertical direction Z of the first extension line 31b.The length L1d of the third extension line 31d is a dimension in the vertical direction Z of the third extension line 31d. The length L1b of the first extension line 31b may be the same as the length L1d of the third extension line 31d, or may be smaller than the length L1d of the third extension line 31d.

[0042] As in Fig. 3, portions including the first extension line 31b, the second extension line 31c, and the third extension line 31d of the first line 31 extend in the vertical direction Z in a straight line as viewed from both the left-right direction Y and the vertical direction Z. In the first embodiment, the portions including the first extension line 31b, the second extension line 31c, and the third extension line 31d of the first line 31 are parts of the first line 31 between an end at the bottom of the first extension line 31b to an end at the top of the third extension line 31d. In other words, in the first embodiment, the first line 31 extends in a straight line in the vertical direction Z, from a lower end of the first extension line 31b to an upper end of the third extension line 31d as viewed from the front-rear direction X.

[0043] The second line 32 is connected to the top end of the first line 31. The second line 32 has a pair of parallel lines 32a and 32b, and a coupling line 32c. The pair of parallel lines 32a and 32b extend in the left-right direction Y. The pair of parallel lines 32a and 32b are arranged in the vertical direction Z, which intersects the left-right direction Y, with spaces therebetween. The pair of parallel lines 32a and 32b are straight lines extending parallel to each other in the first embodiment.

[0044] Ends of each of the pair of parallel lines 32a and 32b in the left-right direction Y are connected to each other by the coupling line 32c. In the first embodiment, ends on the right side of each of the pair of parallel lines 32a and 32b are connected to each other by the coupling line 32c. Each of the pair of parallel lines 32a and 32b is connected to a different one of the heat transfer lines 13a. In the first embodiment, a respective end on a left side of the pair of parallel lines 32a and 32b is connected to a respective end on the right side of the heat transfer lines 13a. The heat transfer lines 13a connected to the pair of parallel lines 32a and 32b are the heat transfer lines 13a arranged relatively at the top among the plurality of heat transfer lines 13a.

[0045] The parallel line 32b is arranged below the parallel line 32a with a gap therebetween. On a wall at the bottom, at a right side portion of the parallel line 32b, a cylinder 32d is formed, projecting downward. The cylinder 32d is a round cylindrical shape opening toward the bottom. An upper end of the first line 31, in other words, the upper end of the third extension line 31d, is fitted into an interior of the cylinder 32d. The third extension line 31d and the cylinder 32d are fixed to each other, for example, by welding. Thus, the third extension line 31d is connected to one side of the pair of parallel lines 32a and 32b, in other words, to the parallel line 32b.In the first embodiment, the third extension line 31d is connected to one end on the right side of the parallel line 32b, which is arranged at a lower side in the vertical direction Z of the pair of parallel lines 32a and 32b.

[0046] The coupling line 32c is arranged on a right side of the pair of parallel lines 32a and 32b. The coupling line 32c connects ends in the left-right direction Y of the pair of parallel lines 32a and 32b to each other. In the first embodiment, the coupling line 32c extends in a curved shape. More specifically, the coupling line 32c extends as a semicircle protruding on the right side as viewed from the front-back direction X. An end at the top of the coupling line 32c is connected to an end at the right side of the parallel line 32a. An end at the bottom of the coupling line 32c is connected to an end at the right side of the parallel line 32b.By connecting the pair of parallel lines 32a and 32b using the coupling line 32c, which is a semicircle as viewed from the front-rear direction X, the second line 32 forms a U-shape opening to one side in the left-right direction Y, in other words, to the left side (-Y side) in the first embodiment as viewed from the front-rear direction X.

[0047] In the first embodiment, the refrigerant distributor 30 functions as a distributor that distributes the refrigerant 19 when the indoor unit 20 is operated in the heating mode. When the indoor unit 20 is operated in the heating mode, the refrigerant 19 flows from the heat transfer line 13a, which is connected to the connecting line 31a, into an interior of the connecting line 31a, as shown in Fig. 3 is shown by a dashed arrow. Here, the refrigerant 19 flowing into the connecting pipe 31a is the refrigerant 19 in a gas-liquid two-phase state. The refrigerant 19 flowing into the connecting pipe 31a flows to the right side of the connecting pipe 31a and flows into the first extension pipe 31b. The refrigerant 19 flowing into the first extension pipe 31b flows upward, passes through the first extension pipe 31b, the second extension pipe 31c, and the third extension pipe 31d in this order, and flows from the upper end of the third extension pipe 31d into an interior of the parallel pipe 32b.The refrigerant 19 flowing into the parallel line 32b collides with a part of an inner wall of the parallel line 32b, which is opposite to the upper surface of the third extension line 31d, and disperses to become two flows flowing in opposite directions in the left-right direction Y. Part of the refrigerant 19 flowing into the parallel line 32b flows to the left side of the parallel line 32b and flows to the inside of the heat transfer line 13a connected to the parallel line 32b. The remaining refrigerant 19 flowing into the parallel line 32b flows to the right side, to an inside of the coupling line 32c.The refrigerant 19 flowing into the coupling line 32c flows into the parallel line 32a, then into the left side of the parallel line 32a, and into the heat transfer line 13a connected to the parallel line 32a. Thus, the refrigerant distributor 30 distributes the refrigerant 19 flowing into the first line 31 to the two heat transfer lines 13a by causing the flow to branch to become two flows in the second line 32.

[0048] Next, a refrigerant distributor 530 of a comparative example will be explained. Fig. 10 is a cross-sectional view showing a comparative example of a portion of the refrigerant distributor 530. As shown in Fig. As shown in Figure 10, the refrigerant distributor 530 has a first conduit 531, which is relatively different from the first embodiment. In the following explanations of the refrigerant distributor 530, configurations similar to the configurations of the refrigerant distributor 30 of the first embodiment are denoted by the same reference numerals, and their explanations are omitted.

[0049] The first line 531 has the first extension line 31b, a second extension line 531c, and a third extension line 531d. The second extension line 531c bends to a side (-Y side) in the left-right direction Y in which the pair of parallel lines 32a and 32b extend, relative to the first extension line 31b. A line bend 533b is a connecting portion of the first extension line 31b and the second extension line 531c. Except for an aspect of bending in a different direction relative to the first extension line 31b, the line bend 533b is the same as the line bend 33b of the first embodiment. The second extension line 531c is arranged on an upper side as it approaches a left side from an end at the upper side of the first extension line 31b.

[0050] The third extension line 531d bends and extends in the vertical direction Z from the second extension line 531c, and is connected to the parallel line 32b. The third extension line 531d is arranged at a location offset from the first extension line 31b in the left-right direction Y. The third extension line 531d is arranged further to the left side (-Y side) than the first extension line 31b. A length L2d of the third extension line 531d is less than ten times the inner diameter Dd of the third extension line 531d. In the example of Fig. 10, the length L2d of the third extension line 531d is less than five times the inner diameter Dd of the third extension line 531d. A bend 533c is a connecting portion of the second extension line 531c and the third extension line 531d. Except for an aspect of the relative positioning of the second extension line 531c, which is different from that of the third extension line 531d, the bend 533c is the same as the bend 33c of the first embodiment.

[0051] In the refrigerant distributor 530 of the comparative example, when the refrigerant 19 flows from the interior of the first extension line 31b into an interior of the second extension line 531c, a liquid refrigerant LR of the liquid-gas two-phase state of the refrigerant 19 is pushed upward against an upper surface of an inner wall 531e of an inner wall of the second extension line 531c due to the momentum of the flow of the liquid refrigerant LR in the first extension line 31b. The liquid refrigerant LR, which is pushed against the inner wall 531e due to the momentum, flows along the inner wall 531e into the interior of the second extension line 531c and flows to an interior of the third extension line 531d.The liquid refrigerant LR flowing inside the third extension line 531d flows, due to the momentum generated when the liquid refrigerant LR flows inside the first extension line 531b and inside the second extension line 531c, along an inner wall 531f of the third extension line 531d, which is connected to the inner wall 531e, to the inside of the third extension line 531d. The inner wall 531f is a portion located on the right side (+Y side) of an inner wall of the third extension line 531d. The liquid refrigerant LR flowing along the inner wall 531f toward the top flows inside the second line 32 of the parallel line 32b.

[0052] Since the liquid refrigerant LR flows along the inner wall 531f due to the momentum, the refrigerant 19 inside the third extension line 531d is in a state where the liquid refrigerant LR shifts to the right side, and a refrigerant in a gas state GR shifts to the left side. When the refrigerant 19 in the above state collides with a portion facing the inner walls of the parallel line 32b of the third extension line 531d, it becomes easier for the liquid refrigerant LR shifted to the right to flow to the right side via the coupling line 32c to the parallel line 32a, and for the refrigerant in the gas state GR shifted to the left to flow to the inside of the parallel line 32b.Accordingly, the amount of refrigerant 19 flowing from the parallel line 32b to the heat transfer line 13a becomes smaller than the amount of refrigerant 19 flowing from the parallel line 32a to the heat transfer line 13a. Accordingly, by providing the line bends 533b and 533c in the refrigerant distributor 530 of the comparative example, an imbalance is generated in the liquid refrigerant LR due to the inertia, and therefore, an imbalance exists in the amount of refrigerant 19 distributed. Due to the imbalance in the amount of refrigerant 19 flowing to each of the heat transfer lines 13a, there is a case where the heat exchange rate of the heat exchanger 13 is deteriorated.

[0053] In contrast, the second extension pipe 31c according to the first embodiment is curved with respect to the first extension pipe 31b to one side in the front-to-rear direction X, which is both orthogonal to the left-to-right direction Y in which the pair of parallel pipes 32a and 32b extend, and orthogonal to the vertical direction Z intersecting the left-to-right direction Y. Therefore, even if an imbalance occurs in the liquid refrigerant LR flowing inside the third extension pipe 31d due to the momentum generated within the refrigerant 19, the direction in which the liquid refrigerant LR is displaced is not the left-to-right direction Y in which the pair of parallel pipes 32a and 32b extend, but the front-to-rear direction X.Accordingly, when the refrigerant 19 flowing from the third extension line 31d into the interior of the parallel lines 32b collides with the inner wall of the interior of the parallel lines 32b, it is difficult for an imbalance to form in the amount of the refrigerant 19 that is divided in the left-right direction Y and then distributed. Therefore, it is possible to suppress the generation of an imbalance in the amount of the refrigerant 19 distributed to each of the pairs of parallel lines 32a and 32b. As such, it is difficult for imbalances to form in the amounts of the refrigerant 19 flowing into the interior of the plurality of heat transfer lines 13a, and it is possible to prevent the heat exchange rate of the heat exchanger 13 from deteriorating. Therefore, it is possible to improve the efficiency of the refrigeration cycle device 100 including the heat exchanger 13.

[0054] By providing a portion of the first pipe 31 that is curved, it is possible to prevent the first pipe 31 from contacting other elements or the like of other pipes, and it is possible to arrange the first pipe 31 so as to avoid other elements. As mentioned above, in the refrigerant distributor 530 of the comparative example, the first pipe 531 is curved to avoid other pipes and other elements or the like, thus creating an imbalance in the amount of the refrigerant 19 distributed. Conversely, according to the first embodiment, as explained above, it is possible to avoid an imbalance in the amount of the refrigerant 19 distributed by the refrigerant distributor 30 while having a portion of the first pipe 31 that is curved.As such, it is possible to properly dispose the refrigerant distributor 30 inside the outdoor unit 10 while avoiding other elements or the like from other piping, and it is possible to prevent an imbalance in the amount of the refrigerant 19 distributed by the refrigerant distributor 30 from occurring.

[0055] According to the first embodiment, portions including the first extension line 31b, the second extension line 31c, and the third extension line 31d of the first line 31 extend in a straight line shape extending in the vertical direction Z as viewed from the front-rear direction X, which is orthogonal to both the left-right direction Y and the vertical direction Z. Thus, it is possible to prevent an imbalance in the left-right direction Y in the liquid refrigerant LR from occurring in the refrigerant 19 flowing from the inside of the first extension line 31b via the second extension line 31c inside the third extension line 31d. Therefore, it is possible to further suppress the generation of an imbalance in the amount of the refrigerant 19, and it is possible to further suppress deterioration of the heat exchange rate of the heat exchanger 13.

[0056] According to the first embodiment, a length L1d of the third extension pipe 31d is ten times longer than the inner diameter Dd of the third extension pipe 31d. As such, it is possible to appropriately make the length L1d of the third extension pipe 31d longer. Accordingly, even if the liquid refrigerant LR flowing inside the third extension pipe 31d is unbalanced in the left-right direction Y due to the refrigerant 19 flowing inside the pipe bend 33a or the like, it is easy to resolve the unbalanced liquid refrigerant LR flowing inside the third extension pipe 31d in the left-right direction Y by causing the liquid refrigerant LR to flow inside the relatively long third extension pipe 31d.Specifically, since the friction to which the liquid refrigerant LR is subjected when flowing along the inner walls is relatively large, the liquid refrigerant LR tends to flow toward the gas-state refrigerant GR, which experiences less resistance due to friction, and the liquid refrigerant LR gradually mixes with the gas-state refrigerant GR, thereby resolving this imbalance in the liquid refrigerant LR. Accordingly, it is possible to prevent the refrigerant 19 from flowing to the interior of the second pipe 32 in a state where the liquid refrigerant LR and the gas-state refrigerant GR are divided in the left-right direction Y, and it is possible to appropriately suppress the generation of imbalance in the amount of the refrigerant 19 distributed in the second pipe 32.Therefore, it is possible to appropriately suppress deterioration of the heat exchange rate of the heat exchanger 13.

[0057] In the refrigerant distributor 530 of the comparative example, since the length L2d of the third extension line 531d is less than ten times the inner diameter Dd of the third extension line 531d, the third extension line 531d is small. As a result, it is difficult to resolve an imbalance of the liquid refrigerant LR in the left-right direction Y while the liquid refrigerant LR flows through the interior of the third extension line 531d.

[0058] According to the first embodiment, the first extension line 31b extends in the vertical direction Z. Therefore, the first extension line 31b and the third extension line 31d extend in the same direction. With such a structure, the refrigerant 19 flowing from the inside of the first extension line 31b through the inside of the second extension line 31c into the inside of the third extension line 31d is more likely to be subjected to the effects of a momentum force generated inside the first extension line 31b. Therefore, if the liquid refrigerant LR is uneven in the left-right direction Y due to the momentum force, further imbalance of the liquid refrigerant LR is likely to occur.With respect to the above structure, according to the aforementioned first embodiment, since it is possible to prevent the liquid refrigerant LR from flowing into the interior of the second pipe 32 in a state of imbalance in the left-right direction Y, even if the first extension pipe 31b and the third extension pipe 31d have a structure in which both extend in the same direction, it is possible to suppress an occurrence of imbalance in the amount of the refrigerant 19 being distributed. By providing the first extension pipe 31b and the third extension pipe 31d, which have a structure in which both extend in the same direction, it is possible to simplify the structure of the refrigerant distributor 30 and to reduce the manufacturing cost of the refrigerant distributor 30.

[0059] According to the first embodiment, the curvature angle θ1a of the second extension line 31c with respect to the first extension line 31b and the curvature angle θ2a of the third extension line 31d with respect to the second extension line 31c are greater than 0 degrees and less than 90 degrees. Therefore, when the refrigerant 19 flows from the inside of the first extension line 31b to the inside of the second extension line 31c, and when the refrigerant 19 flows from the inside of the second extension line 31c to the inside of the third extension line 31d, it is possible to avoid a large change in a direction of the flow of the refrigerant 19. Accordingly, it is possible to reduce losses generated when the refrigerant 19 flows through the first pipe 31, and it is possible to promote the refrigerant 19 to flow easily inside the refrigerant distributor 30.

[0060] According to the first embodiment, the second direction in which the pair of parallel lines 32a and 32b extend and which intersects the first direction is the vertical direction Z. The third extension line 31d is connected from below to the parallel line 32b which is located lower among the parallel lines 32a and 32b in the vertical direction Z. This makes it possible to suppress an imbalance due to gravity in the amount of the refrigerant 19 that is distributed and flows to each of the parallel lines 32a and 32b. Therefore, it is possible to further appropriately suppress an imbalance in the amount of the refrigerant 19 that is distributed from its generation, and it is possible to appropriately suppress the heat exchange rate of the heat exchanger 13 from being deteriorated.

[0061] According to the first embodiment, viewed from the front-rear direction X, which is orthogonal to both the left-right direction Y and the vertical direction Z, the second pipe 32 has a U-shape opening to one side in the left-right direction Y. As such, it is possible to form the coupling pipe 32c in the shape of a circular arc, and it is possible to easily flow the refrigerant 19 into the interior of the coupling pipe 32c. Accordingly, it is possible to make the refrigerant 19 flowing toward the interior of the coupling pipe 32c, which is dispersed by the refrigerant 19 after colliding with the inner walls of the parallel pipe 32b, easily flow into the interior of the parallel pipe 32a.

[0062] According to the first embodiment, the first line 31 has the connecting line 31a connected to the other elements. One end of the connecting line 31a, which is connected to the other elements, is an opposite side to an end on a side where the second line 32 is contacted by the first line 31. At least one bend 33a is formed between the connecting line 31a and the first extension line 31b. As such, it is possible to properly connect the connecting line 31a to the other elements, and it is possible to arrange and extend the first line 31 in a desired direction.

[0063] According to the first embodiment, the length L1b of the first extension pipe 31b is greater than or equal to ten times the inner diameter Db of the first extension pipe 31b. Therefore, even if the liquid refrigerant LR flowing inside the first extension pipe 31b is unbalanced in the left-right direction Y because the refrigerant 19 flows to the inside of the pipe bend 33a or the like, it is easy to resolve the unbalanced liquid refrigerant LR flowing inside the first extension pipe 31b in the left-right direction Y by allowing the liquid refrigerant LR to flow inside the relatively long first extension pipe 31b.

[0064] In the first embodiment, when the length L1b of the first extension pipe 31b is greater than or equal to ten times the inner diameter Db of the first extension pipe 31b, the length L1d of the third extension pipe 31d may be less than ten times the inner diameter Dd of the third extension pipe 31d. Even in such a case where the refrigerant 19 flows to the inside of the pipe bends 33b and 33d after resolving an imbalance of the liquid refrigerant LR in the left-right direction Y, which is generated due to the pipe bend 33a inside the first extension pipe 31b, it is possible to suppress an imbalance of the liquid refrigerant LR in the left-right direction inside the third extension pipe 31d because it is difficult for the liquid refrigerant LR to become irregular in the left-right direction Y.Thus, in the first embodiment, even in a case where it is not possible to ensure a sufficient length L1d of the third extension line 31d due to its positioning with respect to other elements, by setting the length L1b of the first extension line 31b greater than or equal to ten times the inner diameter Db of the first extension line 31b, it is possible to achieve the same effect as that achieved when the length L1d of the third extension line 31d is made greater than or equal to ten times the inner diameter Dd of the third extension line 31d. Second embodiment

[0065] Fig. 6 is a view showing a portion of a refrigerant distributor 230 in a second embodiment, viewed from the left-right direction Y. In the following explanations, configurations similar to those of the above-mentioned embodiments are assigned the same reference numerals, and their explanations are omitted.

[0066] As in Fig. As shown in Fig. 6, a first extension line 231c in a first line 231 of the refrigerant distributor 230 extends rearward (-X direction) from the end at the top of the first extension line 31b. The second extension line 231c in the second embodiment extends in a straight line in a direction parallel to the front-rear direction X. A curvature angle θ1b of the second extension line 231c with respect to the first extension line 31b and a curvature angle θ2b of the third extension line 31d with respect to the second extension line 231c are each 90 degrees. Other configurations of the refrigerant distributor 230 are the same as the other configurations of the refrigerant distributor 30 of the first embodiment.

[0067] Even if the curvature angle θ1b of the second extension pipe 231c with respect to the first extension pipe 31b and the curvature angle θ2b of the third extension pipe 31d with respect to the second extension pipe 231c are each 90 degrees as in the above second embodiment, it is possible to reduce losses generated when the refrigerant 19 flows in an interior of the first pipe 231. Third embodiment

[0068] Fig. 7 is a view showing a portion of a refrigerant distributor 330 in a third embodiment, viewed from the left-right direction Y. In the following explanations, configurations similar to those of the above-mentioned embodiments have been assigned the same reference numerals, and their explanations will be omitted.

[0069] As in Fig. As shown in Fig. 7, a second extension line 331c extends in a first line 331 of the refrigerant distributor 330 from the top end of the first extension line 31b to the rear side (-X side) and to the bottom side. The second extension line 331c is located at the bottom side as its rear side is approached from the top end of the first extension line 31b. A curvature angle θ1c of the second extension line 331c with respect to the first extension line 31b and a curvature angle θ2c of the second extension line 331c with respect to the third extension line 31d are each obtuse angles greater than 90 degrees. Other configurations of the refrigerant distributor 330 are the same as the other configurations of the refrigerant distributor 30 of the first embodiment. Fourth embodiment

[0070] Fig. 8 is a view showing a portion of a refrigerant distributor 430 according to a fourth embodiment, viewed from the front-rear direction X. Fig. 9 is a view showing a portion of the refrigerant distributor 430 in the fourth embodiment, viewed from the left-right direction Y. In the following explanations, configurations similar to those of the above-mentioned embodiments have been assigned the same reference numerals, and their explanations will be omitted.

[0071] As in Fig. As shown in Fig. 8, a first pipe 431 of the refrigerant distributor 430 has the first extension pipe 31b, a second extension pipe 431c, and the third extension pipe 31d. The second extension pipe 431c bends with respect to the first extension pipe 31b on a side in the left-right direction Y (-Y side) in which the pair of parallel pipes 32a and 32b extend. The second extension pipe 431c is arranged more upwards from the end at the top of the first extension pipe 31b as it approaches the left side. Except for the difference in the direction of curvature, the second extension pipe 431c is the same with respect to the first extension pipe 31b as the second extension pipe 31c in the first embodiment.

[0072] As in Fig. As shown in Fig. 9, a part of the first piping 431 including the first extension piping 31b, the second extension piping 431c, and the third extension piping 31d is a shape extending in a straight line in the vertical direction Z as viewed from the left-right direction Y in which the pair of parallel piping 32a and 32b extend. In the fourth embodiment, a part of the first piping 431 including the first extension piping 31b, the second extension piping 431c, and the third extension piping 31d is a portion of the first piping 431 extending from an end at the top of the first extension piping 31b to the end at the top of the third extension piping 31d. Other configurations of the refrigerant distributor 430 are the same as the other configurations of the refrigerant distributor 30 in the first embodiment.

[0073] Even if the second extension line 431c does not bend in the front-rear direction X with respect to the first extension line 31b and extends as in the case of the embodiment shown in the comparative example in Fig.10, it is possible to suppress an imbalance in the amount of refrigerant 19 distributed by the refrigerant distributor 430 by making the length L1d of the third extension pipe 31d greater than or equal to ten times the inner diameter Dd of the third extension pipe 31d, as shown in the above fourth embodiment. Specifically, when the liquid refrigerant LR, which is unbalanced in the left-right direction Y, passes through the second extension pipe 531c to flow into the interior of the third extension pipe 31d, the liquid refrigerant LR mixes with the refrigerant in a gas state GR because the liquid refrigerant LR flows inside the relatively long third extension pipe 31d, and it is easy to resolve the imbalance in the liquid refrigerant LR.Thus, it is possible to suppress the occurrence of an imbalance in the amount of refrigerant 19 distributed into the second line 32.

[0074] Although embodiments of the present disclosure have been explained above, configurations of the present disclosure are not particularly limited to these, and it is possible to modify the configurations and methods as mentioned below.

[0075] As long as a second extension line curves relative to a first extension line to one side in a direction orthogonal to both a first direction and a second direction, a length of the third extension line can be any length. As long as the length of the third extension line is greater than or equal to ten times an inner diameter of the third extension line, the first extension line and the second extension line can curve in any direction and can each extend in any direction. A length of the first extension line can be any length less than ten times an inner diameter of the first extension line.

[0076] In the present disclosure, the phrase "A second extension line curves to one side with respect to a first extension line in a direction orthogonal to both a first direction and a second direction" means that when the second extension line curves and extends away from the first extension line, the second extension line may be arranged to one side in a direction orthogonal to both the first direction and the second direction, and the second extension line may extend in a direction slightly inclined toward the first direction with respect to the direction orthogonal to both the first direction and the second direction.More specifically, for example, in the above-mentioned first embodiment, the second extension line 31c may be arranged further up as the right side is approached from the first end on the top side of the first extension line 31b, and may extend in any direction located on both sides of the left-right direction Y.

[0077] As mentioned above, as long as the angle of curvature of the second extension line with respect to the first extension line and the angle of curvature of the third extension line with respect to the second extension line are each greater than 0 degrees, the angles of curvature thereof are not particularly limited. As long as the angle of curvature of the second extension line with respect to the first extension line and the angle of curvature of the third extension line with respect to the second extension line are each greater than 0 degrees and less than or equal to 90 degrees, it is possible to reduce losses generated when a refrigerant flows through the first line.

[0078] As long as the third extension line is connected to one of a pair of parallel lines of the second line, the third extension line can be connected to one of the pair of parallel lines in any way. The third extension line can be connected to a parallel line that is upward in the vertical direction Z. In the first extension line, two or more bends can be formed between a connecting line and the first extension line. As long as the second line has a coupling line that connects the pairs of parallel lines and connects ends of the pair of parallel lines to each other in the first direction, the second line can have any shape.

[0079] A function of the refrigerant distributor according to the present disclosure is not particularly limited. A heat exchanger including the refrigerant distributor according to the present disclosure may be a heat exchanger of an indoor unit of a refrigeration cycle device. Both the heat exchanger of the indoor unit and a heat exchanger of an outdoor unit of a refrigeration cycle device may be heat exchangers including the refrigerant distributor according to the present disclosure. As long as the refrigeration cycle device including the heat exchangers of the present disclosure uses a refrigeration cycle in which a refrigerant is circulated, the device is not limited to an air conditioner. The refrigeration cycle device may be a water heater or the like of a heat pump.

[0080] The relative positions and dimensions of the various embodiments above are merely examples and are not particularly limited, as long as the different relative positions and dimensions and the like in the present disclosure do not deviate from the technical spirit of the present disclosure. The different configurations and different methods explained above can be combined as needed as long as there are no conflicts in their technical content. List of reference symbols 13 heat exchangers 13a Heat transfer line (other element) 13b Rib 19 Refrigerants 30, 230, 330, 430, 530 refrigerant distributor 31, 231, 331, 431, 531 first line 31a connecting cable 31b first extension line 31c, 231c, 331c, 431c, 531c second extension line 31d, 531d third extension line 32 second line 32a, 32b parallel line 32c coupling line 33a Pipe elbow 100 refrigeration cycle unit D inner diameter L1b, L1d length Y Left-right direction (first direction) Z vertical direction (second direction) QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] WO 2014 / 199 501

[0003]

Claims

[1] Refrigerant distributor which distributes a refrigerant, comprising: a first line; and a second line connected to the first line; wherein the second line includes: a pair of parallel lines extending in the first direction and arranged in a second direction intersecting the first direction with spaces therebetween, and a coupling line connecting ends in the first direction of the pair of parallel lines, the first line includes: a first extension line extending in the second direction, a second extension line which curves and extends from the first extension line, a third extension line which curves and extends from the second extension line in the second direction and is connected to one of the pair of parallel lines, and the second extension line curves with respect to the first extension line to one side in a direction that is orthogonal to both the first direction and the second direction. [2] The refrigerant distributor according to claim 1, wherein portions of the first pipe including the first extension pipe, the second extension pipe, and the third extension pipe extend in a straight line shape extending in the second direction as viewed from the direction orthogonal to both the first direction and the second direction. [3] The refrigerant distributor according to claim 1 or 2, wherein a length of the third extension line is greater than or equal to ten times an inner diameter of the third extension line. [4] Refrigerant distributor distributing a refrigerant, comprising: a first line; and a second line connected to the first line; wherein the second line includes: a pair of parallel lines extending in the first direction and arranged in a second direction intersecting the first direction with spaces therebetween, and a coupling line connecting ends in the first direction of the pair of parallel lines, the first line includes: a first extension line, a second extension line which curves and extends from the first extension line, a third extension line which curves and extends from the second extension line in the second direction and is connected to one of the pair of parallel lines, and a length of the third extension line is greater than or equal to ten times an inner diameter of the third extension line. [5] The refrigerant distributor according to claim 4, wherein the first extension line extends in the second direction. [6] The refrigerant distributor according to any one of claims 1 to 5, wherein a curvature angle of the second extension line with respect to the first extension line and a curvature angle of the third extension line with respect to the second extension line is greater than 0 degrees and less than or equal to 90 degrees. [7] Refrigerant distributor according to one of claims 1 to 6, wherein the second direction is a vertical direction, and the third extension line from the bottom is connected to the parallel line of the pair of parallel lines which is arranged at the bottom in the vertical direction. [8] The refrigerant distributor according to any one of claims 1 to 7, wherein, viewed from the direction orthogonal to both the first direction and the second direction, the second pipe has a U-shape opening to one side in the first direction. [9] Refrigerant distributor according to one of claims 1 to 8, wherein the first line has a connecting line that is connected to the other elements, one end of the connecting line connected to the other elements is located on a side opposite to an end on a side to which the second line is connected from the first line, and a line bend is formed between the connecting line and the first extension line. [10] The refrigerant distributor according to any one of claims 1 to 9, wherein the length of the first extension line is greater than or equal to ten times the inner diameter of the first extension line. [11] Heat exchanger, further comprising: the refrigerant distributor according to one of claims 1 to 10, several heat transfer lines, and several fins connected to the heat transfer lines, whereby each of the pairs of parallel lines is connected to a different heat transfer line of the plurality of heat transfer lines. [12] Refrigeration cycle device, comprising: the heat exchanger according to claim 11.

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