Refrigerant flow unit and refrigeration device

Abstract

The refrigerant flow path unit (10) comprises: a unit body (11) having a plurality of plates (21, 22, 23) stacked on each other and having a refrigerant flow path (15) formed therein; refrigerant tubes (12, 13, 103); and first solder (B3, B4) for joining the unit body (11) and the refrigerant tubes (12, 13, 103), wherein the unit body (11) comprises a first plate (21) and a second plate (22), wherein the first plate has a refrigerant flow path (15) formed therein; An opening (21a), a second plate is formed with a second opening (22a) connected to the first opening (21a), and is stacked on the first plate (21), a refrigerant tube (12, 13, 103) is inserted into the first opening (21a) and the second opening (22a), and a first solder (B3, B4) connects the inner circumference of the first opening (21a) and the inner circumference of the second opening (22a) to the outer circumference of the refrigerant tube (12, 13, 103).

Description

Technical Field

[0001] The present disclosure relates to a refrigerant flow path unit and a refrigeration device. Background Art

[0002] It is known that in a refrigeration device including a refrigerant circuit that performs a vapor compression refrigeration cycle operation, a plurality of refrigerant pipes for the refrigerant to flow are concentrated into one to achieve miniaturization of the refrigerant circuit. For example, Patent Document 1 discloses a substrate (refrigerant flow path unit) having an upper substrate and a lower substrate stacked on each other and having a refrigerant flow path formed therein. A hole portion is formed in the upper substrate of the substrate, and an auxiliary pipe connected to a compressor, a heat exchanger, etc. is connected to the hole portion.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent document 1: Japanese Patent Application Laid-Open No. 9-79616. Summary of the invention

[0006] Technical problem to be solved by the invention

[0007] In the technology described in Patent Document 1, the hole formed in the upper substrate is joined to the auxiliary pipe by brazing. However, since vibration is transmitted to the joint between the auxiliary pipe connected to the compressor and the hole, the auxiliary pipe is required to be firmly joined to the hole.

[0008] An object of the present disclosure is to firmly join a plate constituting a refrigerant flow path unit and a refrigerant pipe.

[0009] Technical solutions adopted to solve technical problems

[0010] (1) The refrigerant flow path unit of the present disclosure includes:

[0011] a unit body having a plurality of plates stacked one on another and having a refrigerant flow path formed therein;

[0012] Refrigerant pipes; and

[0013] a first solder that joins the unit body to the refrigeration tube,

[0014] The unit body includes a first plate and a second plate, wherein the first plate is formed with a first opening, and the second plate is formed with a second opening communicating with the first opening and is stacked on the first plate.

[0015] The refrigerant pipe is inserted into the first opening and the second opening,

[0016] The first brazing material joins the inner peripheral surface of the first opening and the inner peripheral surface of the second opening to the outer peripheral surface of the refrigerant pipe.

[0017] In the refrigerant flow unit having the above structure, the refrigerant tube is joined across the first plate and the second plate. Therefore, the joining length between the unit body and the refrigerant tube can be increased, and the joining strength can be improved.

[0018] (2) Preferably, the refrigerant pipe is connected to another refrigerant pipe connected to a compressor of an air conditioner.

[0019] Since the compressor constitutes a vibration source that generates vibration, it is more desirable to increase the joining strength between the refrigerant pipe to which the vibration from the compressor is transmitted and the unit body.

[0020] (3) Preferably, the refrigerant flow path unit further includes a second solder that joins the first plate and the second plate together.

[0021] (4) Preferably, the melting point of the first solder is the same as the melting point of the second solder.

[0022] According to this configuration, when the first plate and the second plate are bonded together and the first plate and the second plate and the refrigerant pipe are bonded together by furnace brazing at the same time, the temperature in the furnace can be easily controlled.

[0023] (5) Preferably, the first plate is formed thinner than the second plate.

[0024] According to such a structure, the weight of the refrigerant flow path unit can be reduced.

[0025] (6) Preferably, the first plate has a cylindrical protrusion, and the protrusion protrudes in the stacking direction of the first plate and the second plate to form the first opening.

[0026] According to this configuration, the refrigerant tube is inserted into the first opening formed in the cylinder of the protruding portion, and the inner peripheral surface of the protruding portion and the outer peripheral surface of the refrigerant tube are joined by the first brazing material, thereby increasing the joining length of the two.

[0027] (7) Preferably, the refrigerant tube includes a first refrigerant tube and a second refrigerant tube having a smaller diameter than the first refrigerant tube.

[0028] The first refrigerant tube has a greater length joined to the first plate and the second plate in the tube axis direction than the second refrigerant tube.

[0029] According to this configuration, the bonding strength between the first refrigerant tube having a larger diameter and the unit main body can be increased compared to the second refrigerant tube having a smaller diameter.

[0030] (8) A refrigeration device according to the present disclosure includes the refrigerant flow path unit according to any one of (1) to (7). BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a perspective view of the refrigerant flow path unit according to the first embodiment of the present disclosure as viewed from one side.

[0032] Figure 2 This is a perspective view of the refrigerant flow path unit according to the first embodiment of the present disclosure as viewed from the other side.

[0033] Figure 3 This is a cross-sectional view of a portion of the refrigerant flow path unit.

[0034] Figure 4 This is a cross-sectional view showing an enlarged view of the joint portion between the unit body and the refrigerant pipe.

[0035] Figure 5 This is a cross-sectional view showing an enlarged view of a joint portion between a unit body and a refrigerant pipe of a refrigerant flow channel unit according to the second embodiment.

[0036] Figure 6 This is a cross-sectional view showing an enlarged view of a joint portion between a unit body and a refrigerant pipe of a refrigerant flow channel unit according to the third embodiment.

[0037] Figure 7 It is a cross-sectional view of a part of the refrigerant flow channel unit according to the fourth embodiment. DETAILED DESCRIPTION

[0038] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0039] [First embodiment]

[0040] Figure 1 This is a perspective view of the refrigerant flow path unit according to the first embodiment of the present disclosure as viewed from one side. Figure 2 This is a perspective view of the refrigerant flow path unit according to the first embodiment of the present disclosure as viewed from the other side. Figure 3 This is a cross-sectional view of a portion of the refrigerant flow path unit.

[0041] The refrigerant flow unit 10 of the present embodiment is suitable for use in, for example, a refrigeration device including a refrigerant circuit that operates in a vapor compression refrigeration cycle. Examples of the refrigeration device include air conditioners, refrigerators, freezers, and water heaters.

[0042] The refrigerant flow path unit 10 is connected to a four-way reversing valve, an electric valve, a compressor, a storage tank, an oil separator and other devices constituting a refrigerant circuit. Figure 1As shown, functional components such as a four-way switching valve 61 and an electric valve 62 are connected. The refrigerant flow unit 10 of this embodiment is fixed to a bottom plate of an air conditioner in an upright position (with the plate surface in the vertical direction) via a support stand 63, for example.

[0043] like Figure 3 As shown, the refrigerant flow path unit 10 includes a unit body 11, a refrigerant pipe, i.e., a first joint pipe 12, and a refrigerant pipe, i.e., a second joint pipe 13. The unit body 11 has a plurality of plates 21, 22, 23. The plurality of plates 21, 22, 23 are stacked and joined to each other. The plates 21, 22, 23 of the present embodiment are made of stainless steel. A refrigerant flow path 15 is formed inside the unit body 11. Hereinafter, the direction in which the plurality of plates 21, 22, 23 are stacked (the normal direction of each plate) is also referred to as a first direction. The direction parallel to the plate surfaces of the plates 21, 22, 23 (the direction orthogonal to the first direction) is also referred to as a second direction.

[0044] The plurality of plates 21, 22, 23 include a first plate 21, a second plate 22 stacked on the first plate 21, and a third plate 23 stacked on the second plate 22. The plates 21, 22, 23 adjacent to each other are joined to each other by brazing.

[0045] The first plate 21 is arranged at both ends of the unit body 11 in the first direction. The first plate 21 is formed thinner than the other second plates 22 and third plates 23. The first plate 21 is provided with a protrusion protruding to the outside of the unit body 11 in the first direction, namely a connecting tube 21b. The connecting tube 21b is formed in a cylindrical shape. The axis of the connecting tube 21b is parallel to the first direction. The connecting tube 21b has a first opening 21a formed inside the tube. The first opening 21a is a circular hole that passes through the first plate 21. Figure 3 A total of three first openings 21 a are shown at the two first plates 21. The connecting tubes 21 b and the first openings 21 a are formed by flanging the inner edges of the first plates 21.

[0046] The second plate 22 is located at the second position from both ends of the unit body 11 in the first direction. The second plate 22 is formed thicker than the first plate 21. For example, when the plate thickness of the first plate 21 is 1 mm, the plate thickness of the second plate 22 can be set to four times that, that is, 4 mm. A second opening 22a is formed in the second plate 22. The second opening 22a is a circular hole that penetrates the second plate 22.

[0047] exist Figure 3 A total of three second openings 22a are shown at the two second plates 22. The second openings 22a are communicated with the first openings 21a of the first plate 21. The first openings 21a and the second openings 22a have the same inner diameter.

[0048] In addition, Figure 3At the first plate 21 on one side (upper side) shown in FIG. 1 , two first openings 21a (connecting tubes 21b) are shown along the left and right sides, and their diameters are different from each other. Figure 3 At the second plate 22 on one side (upper side) shown, two second openings 22a are shown along the left and right sides, and the diameters of the second openings 22a are different from each other.

[0049] The third plate 23 is arranged between two second plates 22 arranged at a distance in the first direction. In the present embodiment, three third plates 23 are stacked between the two second plates 22. The third plate 23 is formed to have the same thickness as the second plate 22. Therefore, the second plate 22 and the third plate 23 can be formed by processing the same raw material.

[0050] The third plate 23 has a third opening 23a that constitutes the refrigerant flow path 15. The third opening 23a is a hole that penetrates each third plate 23 or a slit that extends in the second direction. Figure 3 In the example shown, the third opening 23a is formed in a range spanning the two second openings 22a of the second plate 22 on one side. The third opening 23a communicates with the second opening 22a of the second plate 22.

[0051] The first plate 21 , the second plate 22 , and the third plate 23 may be made of materials other than stainless steel, for example, aluminum, aluminum alloy, iron, etc.

[0052] Figure 4 This is a cross-sectional view showing an enlarged view of the joint portion between the unit body and the refrigerant pipe.

[0053] The first joint pipe 12 is installed on one side ( Figure 3 The first joint pipe 12 has a large diameter portion 12a at one end in the pipe axial direction, a small diameter portion 12b at the other end, and a step portion 12c in the middle. The large diameter portion 12a and the small diameter portion 12b are cylindrical. The diameter of the large diameter portion 12a is larger than the diameter of the small diameter portion 12b. The step portion 12c is formed in a conical shape in a manner that the diameter gradually decreases from the large diameter portion 12a toward the small diameter portion 12b.

[0054] The small diameter portion 12b of the first joint pipe 12 is inserted into the first opening 21a and the second opening 22a. The length of the small diameter portion 12b in the pipe axial direction is substantially the same as the sum of the length of the connecting tube 21b in the first direction and the length of the second opening 22a (the thickness of the second plate 22). The outer peripheral surface of the small diameter portion 12b of the first joint pipe 12 is joined to the inner peripheral surface of the first opening 21a and the inner peripheral surface of the second opening 22a by brazing using a brazing material (first brazing material) B3.

[0055] In addition, the inner peripheral surface of the first opening 21a refers to the surface forming the first opening 21a of the first plate 21. Similarly, the inner peripheral surface of the second opening 22a refers to the surface forming the second opening 22a of the second plate 22.

[0056] The first joint pipe 12 of the present embodiment is formed of a material mainly composed of copper, such as copper or copper alloy. However, the first joint pipe 12 may be made of other materials, such as stainless steel, aluminum, aluminum alloy, iron, or the like.

[0057] Another refrigerant pipe 101 is connected to the large diameter portion 12a of the first joint pipe 12. The refrigerant pipe 101 is, for example, Figure 1 As shown in FIG. 1 , a refrigerant pipe extends from the four-way reversing valve 61 and the electric valve 62. Generally, this type of refrigerant pipe 101 is formed of a material having copper as a main component, such as copper or a copper alloy. One end of the refrigerant pipe 101 is inserted into the large diameter portion 12a of the first joint pipe 12, and the outer peripheral surface of the refrigerant pipe 101 and the inner peripheral surface of the large diameter portion 12a are joined by brazing based on a brazing material B2.

[0058] exist Figure 3 At the first plate 21 and the second plate 22 on one side (upper side) shown, two first joint pipes 12 are connected along the left and right sides, and their diameters and lengths in the axial direction of the pipes are different from each other. The first joint pipe 12 with a larger diameter ( Figure 3 The first joint pipe 12 (denoted by reference numeral 51 in the figure) is joined to the inner circumference of the first opening 21a1 and the second opening 22a1 with a large diameter. Figure 3 The inner circumferential surfaces of the first opening 21a2 and the second opening 22a2 having small diameters are joined.

[0059] The length of the connecting tube 21b1 forming the first opening 21a1 with a large diameter in the first direction is greater than the length of the connecting tube 21b2 forming the first opening 21a2 with a small diameter in the first direction. Therefore, the joining length of the first joint pipe 51 with a large diameter and the first plate 21 and the second plate 22 in the first direction is greater than the joining length of the first joint pipe 52 with a small diameter and the first plate 21 and the second plate 22 in the first direction.

[0060] In addition, the first joint pipe 12 may be a pipe having a constant diameter and not including the large diameter portion 12 a , the small diameter portion 12 b , and the step portion 12 c .

[0061] like Figure 3 As shown, the second joint pipe (refrigerant pipe) 13 is installed on the other side ( Figure 3The first plate 21 and the second plate 22 are formed by welding the first and second joint pipes 13 and 13. Another refrigerant pipe 102 connected to a container such as a compressor or a storage tank is connected to the second joint pipe 13. One end 13a of the second joint pipe 13 is inserted into the first opening 21a and the second opening 22a. The outer peripheral surface of the second joint pipe 13 and the inner peripheral surface of the first opening 21a and the inner peripheral surface of the second opening 22a are joined by brazing using a solder (first solder) B3.

[0062] The second joint pipe 13 has an end portion 13a connected to the first plate 21 and the second plate 22, a bent portion 13b bent 90 degrees from the end portion 13a, and a straight portion 13c extending from the bent portion 13b in the second direction. Figure 2 As shown in the figure, the refrigerant flow path unit 10 is arranged upward or horizontally in an upright posture. Therefore, the other refrigerant pipe 102 extending from a container such as a compressor can be easily connected to the other end 13d of the second joint pipe 13 by burner brazing or the like. One end of the refrigerant pipe 102 is inserted into the other end 13d of the second joint pipe 13, and the outer peripheral surface of the refrigerant pipe 102 and the inner peripheral surface of the other end 13d are joined by brazing based on the solder B2.

[0063] like Figure 3 as well as Figure 4 As shown, bronze solder is used for the solder (second solder) B1 for joining the plurality of plates 21, 22, and 23 to each other. Bronze solder is also used for the solder (first solder) B3 for joining the first plate 21 and the second plate 22 to the first joint tube 12. Bronze solder is also used for the solder (first solder) B3 for joining the first plate 21, the second plate 22 to the second joint tube 13. In contrast, phosphorus copper solder is used for the solder B2 for joining the first joint tube 12 to another refrigerant tube 101. Phosphorus copper solder is also used for the solder B2 for joining the second joint tube 13 to another refrigeration tube 102. As the above-mentioned bronze solder, for example, BCu-3 is used. As the phosphorus copper solder, for example, BCuP-2 is used.

[0064] The melting points of the solders B1 and B3 are higher than the melting point of the solder B2.

[0065] Solder B1 and solder B3 are the same solder and therefore have the same melting point. However, solder B1 and solder B3 may be made of different materials but have the same melting point. Solder B1 and solder B3 may also be made of different materials and have different melting points.

[0066] The joining of the plurality of plates 21, 22, 23 to each other and the joining of the first plate 21, the second plate 22 to the first joint pipe 12, the second joint pipe 13 are performed by furnace brazing. Specifically, first, a sheet of solder B1 is set between the plates 21, 22, 23. In addition, a ring-shaped solder B3 is set between the connecting tube 21b of the first plate 21 on one side and the first joint pipe 12. In addition, a ring-shaped solder B3 is set between the connecting tube 21b of the first plate 21 on the other side and the second joint pipe 13. They are put into a furnace heated to a temperature at which the solders B1 and B3 can be melted, for example, about 1040°C, and brazing is performed. In the above manner, the refrigerant flow path unit 10 is manufactured.

[0067] The first joint pipe 12 and the second joint pipe 13 of the refrigerant flow path unit 10 manufactured in the above manner are joined to the other refrigerant pipes 101 and 102 by burner brazing using the solder B2. When the refrigerant pipes 101 and 102 are joined to the first joint pipe 12 and the second joint pipe 13 by burner brazing, the heat of the burner is transferred not only to the first joint pipe 12 and the second joint pipe 13 but also to the unit body 11 by radiation and heat conduction. In particular, the unit body 11 is formed into a block shape by stacking a plurality of plates 21, 22, and 23, and the heat capacity becomes large, so it is easy to absorb the heat of the burner. Therefore, heat is also easily transferred to the solder B1 that joins the plurality of plates 21, 22, and 23. In this embodiment, as the solder B1, a solder having a higher melting point than the melting point of the solder B2 is used. Therefore, by heating the solder B2 (and the surrounding first joint tube 12, second joint tube 13 and refrigerant tubes 101, 102) at a temperature lower than the melting point of the solder B1 but higher than the melting point of the solder B2, it is possible to suppress the solder B1 from melting due to the heat when joining the first joint tube 12, the second joint tube 13 to the refrigerant tubes 101, 102.

[0068] The melting point of the solder B3 for joining the first plate 21 and the second plate 22 to the first joint pipe 12 and the second joint pipe 13 is also higher than that of the solder B2. Therefore, the solder B3 can be prevented from melting due to the heat when joining the first joint pipe 12 and the second joint pipe 13 to the refrigerant pipes 101 and 102.

[0069] In this embodiment, if Figure 4 As shown, the distance L between the connection tube 21b of the first plate 21 and the refrigerant tube 101 mounted on the large diameter portion 12a of the first joint tube 12 is set to, for example, 100 mm or less. When the distance L between the connection tube 21b and the refrigerant tube 101 is set as described above, the heat of the burner is easily transferred to the unit body 11, and therefore, it is more effective to set the melting points of the solders B1, B2, and B3 as described above.

[0070] like Figure 3 As shown, the second joint pipe 13 is formed longer than the first joint pipe 12 in the tube axial direction. The distance between the connection tube 21b of the first plate 21 and the refrigerant pipe 102 connected to the second joint pipe 13 exceeds 100 mm. Therefore, compared with the first joint pipe 12, the heat of the burner used for brazing the second joint pipe 13 and the refrigerant pipe 102 is not easily transferred to the unit body 11 by heat conduction. However, the second joint pipe 13 is bent 90° in the middle, and the other end 13d connected to the refrigerant pipe 102 is close to the unit body 11. Therefore, the heat of the burner is easily transferred to the unit body 11 by radiation. Therefore, it is ideal to use solder B2 having a lower melting point than the solder B1 to connect the refrigerant pipe 102 to the second joint pipe 13, as with the first joint pipe 12.

[0071] [Second Embodiment]

[0072] Figure 5 This is a cross-sectional view showing an enlarged view of a joint portion between a unit body and a refrigerant pipe of a refrigerant flow channel unit according to the second embodiment.

[0073] In the refrigerant flow path unit 10 of the present embodiment, the first plate 21 disposed at both ends in the first direction among the plurality of plates constituting the unit body 11 does not include the connection tube 21b as in the first embodiment. The first joint pipe 12 is inserted into the first opening 21a formed in the first plate 21 and the second opening 22a formed in the second plate 22, and the inner circumferential surface of the first opening 21a and the inner circumferential surface of the second opening 22a are joined by solder B3.

[0074] In this embodiment, the first plate 21 has a guaranteed joining length with the first joint pipe 12, and therefore has the same thickness as the second plate 22 and the third plate 23. The unit body 11 is composed of a total of five or more plates 21, 22, and 23, including two first plates 21 on both sides of the first direction, two second plates 22 stacked on each first plate 21, and one or more third plates 23 arranged between the two second plates 22.

[0075] Although not shown, the second joint pipe 13 (see Figure 3 ) are inserted into the first opening 21a formed in the first plate 21 having the same thickness as the second plate 22 and the second opening 22a formed in the second plate 22 and joined by solder B3.

[0076] The other structures are the same as those of the first embodiment. In this embodiment, the melting point relationship of the solders B1, B2, and B3 is the same as that of the first embodiment.

[0077] [Third Embodiment]

[0078] Figure 6This is a cross-sectional view showing an enlarged view of a joint portion between a unit body and a refrigerant pipe of a refrigerant flow channel unit according to the third embodiment.

[0079] In the refrigerant flow path unit 10 of the present embodiment, the structures of the plates 21, 22, and 23 of the unit body 11 are similar to those of the Figure 3 as well as Figure 4 The unit main body 11 shown is the same, but does not include the first joint pipe 12. Although not shown, the refrigerant flow path unit 10 of this embodiment also does not include the second joint pipe 13.

[0080] The refrigerant tube 103 is directly inserted into the first opening 21a of the first plate 21 and the second opening 22a of the second plate 22, and the inner peripheral surface of the first opening 21a and the inner peripheral surface of the second opening 22a are brazed with the outer peripheral surface of the refrigerant tube 103 by a solder (first solder) B4. The solder B4 has a lower melting point than the solder B1. The refrigerant tube 103 is joined to the unit body 11 by burner brazing or the like.

[0081] exist Figure 6 In the example shown, the first plate 21 has a connecting tube 21b, but the connecting tube 21b can also be omitted. In this case, in order to ensure the joining length of the first plate and the refrigerant pipe 103, it is preferred that the thickness of the first plate 21 is set to the same degree as the thickness of the second plate 22.

[0082] [Fourth Embodiment]

[0083] Figure 7 It is a cross-sectional view of a part of the refrigerant flow channel unit according to the fourth embodiment.

[0084] In the refrigerant flow path unit 10 of this embodiment, first joint pipes 12 are provided on both sides of the unit body 11 in the first direction, and another refrigerant pipe 101 is connected to the first joint pipe 12. The other structures are basically the same as those of the first embodiment.

[0085] [Effects of the Embodiments]

[0086] (1) The refrigerant flow path unit 10 of each of the above-mentioned embodiments includes: a unit body 11 having a plurality of plates 21, 22, 23 stacked on each other and having a refrigerant flow path 15 formed therein; a refrigerant pipe, i.e., a joint pipe 12, 13 or a refrigerant pipe 103; and first solders B3, B4 for joining the unit body 11 to the refrigerant pipe 12, 13, 103. The unit body 11 includes a first plate 21 having a first opening 21a formed therein and a second plate 22 having a second opening 22a communicating with the first opening 21a formed therein and stacked on the first plate 21. The refrigerant pipe 12, 13, 103 is inserted into the first opening 21a and the second opening 22a. The first solders B3, B4 join the inner circumferential surface of the first opening 21a and the inner circumferential surface of the second opening 22a to the outer circumferential surface of the refrigerant pipe 12, 13, 103.

[0087] In the refrigerant flow path unit 10 of the above structure, since the refrigerant pipes 12, 13, 103 are joined across the two plates 21, 22, the joining length between the unit main body 11 and the refrigerant pipes 12, 13, 103 can be increased, and the joining strength can be improved. Therefore, for example, in the case where a component that vibrates, such as a compressor, is connected to the refrigerant pipes 12, 13, 103, the influence of the vibration on the joining portion of the refrigerant pipes 12, 13, 103 and the unit main body 11 can be suppressed. Specifically, in the above embodiment, the refrigerant pipe, i.e., the second joint pipe 13, is connected to another refrigerant pipe 102 connected to the compressor of the air conditioner.

[0088] (2) In the above embodiment, the refrigerant flow path unit 10 further includes the second solder B1 for joining the first plate 21 and the second plate 22. The melting point of the first solder B3 is the same as the melting point of the second solder B1. Therefore, when the joining of the first plate 21 and the second plate 22 and the joining of the first plate 21 and the second plate 22 with the refrigerant pipes 12 and 13 are simultaneously performed by furnace brazing, the temperature in the furnace can be easily managed.

[0089] (3) In the above-described first and third embodiments, the first plate 21 is formed thinner than the second plate 22. Therefore, the refrigerant flow path unit 10 can be reduced in weight.

[0090] (4) In the first and third embodiments, the first plate 21 has a connecting tube 21b, which is a cylindrical protrusion that protrudes in the stacking direction of the first plate 21 and the second plate 22 and forms the first opening 21a. Therefore, by inserting the refrigerant tube 12, 13, 103 into the first opening 21a and the second opening 22a formed in the tube of the connecting tube 21b and joining the inner circumferential surface of the first opening 21a and the inner circumferential surface of the second opening 22a to the outer circumferential surface of the refrigerant tube 12, 13, 103 through the first solder B3, B4, the joining length of the two can be increased.

[0091] When the first plate 21 is formed thinner than the second plate 22 , the process of forming the connection tube 21 b on the first plate 21 can be easily performed.

[0092] (5) In the above-mentioned embodiments, the refrigerant tubes exemplified by the first joint tube 12 include the first refrigerant tube 51 and the second refrigerant tube 52 having a smaller diameter than the first refrigerant tube 51, and the first refrigerant tube 51 has a larger joining length with the first plate 21 and the second plate 22 in the tube axis direction than the second refrigerant tube 52. Therefore, the joining strength between the first refrigerant tube 51 having a larger diameter and the unit main body 11 can be improved compared with the second refrigerant tube 52 having a smaller diameter.

[0093] In addition, the present disclosure is not limited to the above-mentioned examples, but is shown by the scope of the claims, and is intended to include the meaning equivalent to the scope of the claims and all modifications within the scope.

[0094] For example, the number of plates constituting the unit body 11 is not limited to the above embodiment, and the refrigerant flow path unit of the present disclosure only needs to include the first plate and the second plate. In addition, the unit body 11 of the refrigerant flow path unit 10 is not limited to the plate shape, and can be in various forms such as a block shape.

[0095] Explanation of symbols

[0096] 10: Refrigerant flow unit

[0097] 11: Unit body

[0098] 12: First joint pipe (refrigerant pipe)

[0099] 13: Second joint pipe (refrigerant pipe)

[0100] 21: First board

[0101] 21a: First opening

[0102] 21b: Connecting tube (protrusion)

[0103] 22: Second board

[0104] 22a: Second opening

[0105] 103: Refrigerant pipe

[0106] B1: Solder (second solder)

[0107] B3: Solder (first solder)

[0108] B4: Solder (first solder)

Claims

1. A refrigerant flow path unit, characterized in that: include: A unit body (11) having a plurality of plates (21, 22, 23) stacked on top of each other and having a refrigerant flow path (15) formed therein; Refrigerant pipes (12, 13, 103); and a first solder (B3, B4) for joining the unit body (11) and the refrigerant pipe (12, 13, 103), The unit body (11) comprises a first plate (21) and a second plate (22), wherein the first plate (21) is formed with a first opening (21a) and is arranged at an end of the unit body (11) in a first direction in which a plurality of plates are stacked, and the second plate (22) is formed with a second opening (22a) communicating with the first opening (21a) and is located at the second block of the unit body (11) from the end in the first direction. The refrigerant pipe (12, 13, 103) is inserted into the first opening (21a) and the second opening (22a), The first solder (B3, B4) joins the inner peripheral surface of the first opening (21a) and the inner peripheral surface of the second opening (22a) to the outer peripheral surface of the refrigerant tube (12, 13, 103). The first plate (21) is formed thinner than the second plate (22).

2. The refrigerant flow path unit according to claim 1, wherein: The refrigerant tube (12) comprises a first refrigerant tube (51) and a second refrigerant tube (52) having a smaller diameter than the first refrigerant tube (51). Compared with the second refrigerant tube (52), the first refrigerant tube (51) has a greater length of connection with the first plate (21) and the second plate (22) in the tube axis direction.

3. The refrigerant flow path unit according to claim 1 or 2, characterized in that: The refrigerant pipe (13) is connected to another refrigerant pipe (102) connected to a compressor of the air conditioner.

4. The refrigerant flow path unit according to claim 1 or 2, characterized in that: The refrigerant flow path unit further includes a second solder (B1) that joins the first plate (21) and the second plate (22).

5. The refrigerant flow path unit according to claim 4, characterized in that: The melting point of the first solder (B3) is the same as the melting point of the second solder (B1).

6. The refrigerant flow path unit according to claim 1 or 2, characterized in that: The first plate (21) has a cylindrical protrusion (21b), and the protrusion (21b) protrudes in the stacking direction of the first plate (21) and the second plate (22) to form the first opening (21a).

7. A refrigeration device, characterized in that: A refrigerant flow path unit comprising the refrigerant flow path unit according to any one of claims 1 to 6.

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