JP2019011929A - Composite tube, freezer, and manufacturing method of composite tube - Google Patents

Abstract

To provide a composite tube which can inhibit corrosion of a refrigerant pipeline of a freezer to prevent damage, and to provide a freezer and a manufacturing method of the composite tube.SOLUTION: A composite tube includes: a metal refrigerant pipeline 10; a plate-like joint part 28 which is formed by the same kind of metal as the refrigerant pipeline 10 and in which a pipe wall of the refrigerant pipeline 10 is joined to one surface; and a metal cooling body 26 having a surface 26c which contacts with the other surface of the joint part 28 and a rear surface 26d which is provided at the opposite side of the surface 26c and contacts with a heating component 25. The refrigerant pipeline 10 is joined to one surface of the joint part 28 by brazing.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a composite tube, a refrigeration apparatus, and a method for manufacturing the composite tube.

2. Description of the Related Art Conventionally, there has been known an apparatus for cooling a heat generating component of a board unit by attaching a cooling jacket supporting a copper pipe through which a refrigerant flows to the heat generating component. In such an apparatus, a heat transfer sheet is interposed between the cooling jacket and the pipe to reduce the thermal resistance between the cooling jacket and the pipe.
Such a heat transfer sheet is disclosed in Patent Document 1, and in the invention of Patent Document 1, the heat transfer sheet is held in the sheet holding portion to suppress the displacement or breakage of the heat transfer sheet.

Japanese Patent Laid-Open No. 2015-233074

  However, in an apparatus for cooling a heat-generating component as disclosed in Patent Document 1, there is a risk that refrigerant piping such as a copper pipe is damaged by corrosion and the refrigerant leaks when the damage is significant. That is, when the refrigerant pipe and the cooling jacket are formed of different metals, there is a portion where the pipe wall of the refrigerant pipe and the cooling jacket are in direct contact, and if moisture exists at this position, The refrigerant piping is easily damaged by

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a composite pipe, a refrigeration apparatus, and a composite pipe manufacturing method that can suppress corrosion.

  The composite pipe according to the first aspect of the present invention includes a metal refrigerant pipe, and a plate-like joint portion formed of the same kind of metal as the refrigerant pipe and having a wall of the refrigerant pipe joined to one surface. And a metal cooling body having a surface that contacts the other surface of the joint and a back surface that is provided on the opposite side of the surface and contacts the heat-generating component.

According to this configuration, the wall of the metal refrigerant pipe is joined to one surface of the joint formed of the same kind of metal, and the other surface of the joint is in contact with the metal cooling body. . Therefore, the pipe wall of the refrigerant pipe does not directly contact the cooling body.
Further, even if the joint portion made of a different metal and the cooling body are in direct contact, the different metal contact corrosion occurs only between the joint portion and the cooling body, and the corrosion does not reach the refrigerant pipe. Therefore, no matter what kind of metal the cooling body is made of, it is possible to prevent the refrigerant pipe from causing the different metal contact corrosion.

  According to the composite pipe of the second aspect of the present invention, in the first aspect, the refrigerant pipe may be joined to one surface of the joint by brazing.

According to this configuration, since the joint portion and the refrigerant pipe are joined by brazing, the facing portion between one surface of the joint portion and the refrigerant pipe is densely joined via the same kind of metal braze. Become. Therefore, it is possible to avoid the occurrence of corrosion between these while ensuring sufficient thermal conductivity between one surface of the joint and the refrigerant pipe.
Further, the plate-like joint and the cooling body are attached in contact with each other. Therefore, the contact area between the joint and the cooling body can be increased. Therefore, it is possible to ensure sufficient thermal conductivity between the refrigerant pipe and the cooling body. Therefore, it is not always necessary to provide a heat transfer promoting member such as a heat transfer sheet or grease between the joint and the cooling body.

  According to the composite pipe of the third aspect of the present invention, in the first or second aspect, the joint portion may be screwed to the cooling body.

  With such a configuration, the contact state between the cooling body and the joint can be further improved.

  According to a refrigeration apparatus of a fourth aspect of the present invention, in the first to third aspects, the heat generating component mounted on a circuit board provided so that the back surface of the cooling body is in contact with It may be.

  According to this configuration, according to this configuration, it is possible to cool the heat generating component by the cooling body while suppressing corrosion from reaching the refrigerant pipe.

  A method for manufacturing a composite pipe according to a fifth aspect of the present invention is a method for installing the composite pipe according to the first to third aspects, wherein the pipe wall of the refrigerant pipe is formed of the same kind of metal as the refrigerant pipe. A step of bonding to one surface of the bonded portion, and a step of bringing the cooling body into contact with the other surface of the bonding portion.

  According to this configuration, it is possible to cool the heat-generating component by the cooling body while suppressing corrosion from reaching the refrigerant pipe.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the composite pipe | tube, the freezing apparatus, and composite pipe | tube which can suppress damage by suppressing corrosion of refrigerant | coolant piping can be provided.

It is a refrigerant circuit diagram of the air conditioner in the first embodiment of the present invention. (A) is a partial exploded perspective view of the controller of the air conditioner in the second embodiment of the present invention, and (b) is a cross-sectional view taken along line AA of (a). It is sectional drawing of the principal part of the air conditioner in 1st Embodiment of this invention. It is sectional drawing which simplifies and shows the composite pipe and heat-emitting component of the air conditioner in 1st Embodiment of this invention. It is sectional drawing explaining the manufacturing method of the composite pipe of the air conditioner in 1st Embodiment of this invention.

An air conditioner (refrigeration apparatus) 1 according to an embodiment of the present invention will be described.
An air conditioner 1 shown in FIG. 1 includes a compressor 2, a four-way switching valve 3, an outdoor fan 4, an outdoor heat exchanger 5, an electronic expansion valve (EEV) 6, an indoor fan 7, an indoor heat exchanger 8, and an accumulator 9. The closed cycle refrigeration cycle 11 is configured by connecting these devices by the refrigerant pipe 10. Among these components, the compressor 2, the four-way switching valve 3, the outdoor fan 4, the outdoor heat exchanger 5, the electronic expansion valve (EEV) 6, and the accumulator 9 are accommodated in the casing 23 of the outdoor unit. The indoor fan 7 and the indoor heat exchanger 8 are accommodated in a housing (not shown) of the indoor unit.

The compressor 2 is a device that compresses the refrigerant.
The four-way switching valve 3 is a device that switches the circulation direction of the refrigerant.
The outdoor heat exchanger 5 is a device that exchanges heat between the refrigerant and the outdoor air from the outdoor fan 4.
The electronic expansion valve (EEV) 6 is a device that adiabatically expands the refrigerant.
The indoor heat exchanger 8 is a device that exchanges heat between the refrigerant and the indoor air from the indoor fan 7.
The accumulator 9 is a device that separates the liquid phase of the refrigerant that has not been completely evaporated by the evaporator and prevents the liquid phase from flowing into the compressor 2.

Furthermore, the air conditioner 1 further includes a controller 12 that controls the operation of the air conditioner 1 based on an operation command from an operation unit such as a remote controller. The controller 12 is accommodated in the casing 23 of the outdoor unit.
For example, the controller 12 is equipped with an inverter that controls the rotation speed of the compressor 2, and switches the four-way switching valve 3 according to the operation mode. Further, the rotation speed of the outdoor fan 4 and the indoor fan 7, and the electronic expansion valve 6 A function for controlling the opening and the like is provided.

Here, as shown in FIG. 2A and FIG. 2B, the housing 23 has a substrate housing portion 14 therein. A controller 12 is attached to the substrate housing portion 14. The substrate housing portion 14 is disposed in the housing 23 of the outdoor unit with a space between the inner surface on the front side of the housing 23 and the inner surface on the back side. Here, the near side means the front side when the outdoor unit is installed, and the back side means the back side when the outdoor unit is installed.
The controller 12 includes a board 21 (circuit board) attached to the board housing portion 14. In the present embodiment, the front surface 21a of the substrate 21 is disposed toward the front side, and the back surface 21b of the substrate 21 is disposed toward the back side.

  The substrate 21 includes various electronic components such as an active converter, a diode module, and a power transistor that constitute an inverter. Some of these various electronic components are mounted on the surface 21 a of the substrate 21. Further, the heat generating component 25 among the electronic components is mounted on the back surface 21 b of the substrate 21.

  As shown in FIG. 3, in the refrigerant pipe 10, a portion 10 </ b> A provided between the electronic expansion valve 6 and the indoor heat exchanger 8 is on the back surface 21 b side of the substrate 21, and the substrate housing portion in the housing 23. 14 on the back side. In this site | part 10A, as shown to Fig.2 (a), a pair of tubular part 10B is provided because the refrigerant | coolant piping 10 is formed in a U shape. Thereby, the refrigerant | coolant piping 10 has a pair of tubular part 10B and the junction part 28 arrange | positioned between these tubular parts 10B and supporting these tubular parts 10B.

  The pair of tubular portions 10 </ b> B are arranged side by side in an inclined direction with respect to the depth direction of the housing 23 (the direction from the near side to the deep side). More specifically, the other tubular portion 10B is arranged on the back side in the housing and on the side surface 24 that is the end surface in the width direction of the housing 23 with respect to the one tubular portion 10B.

The joining portion 28 is formed in a plate shape with the same material as that of the tubular portion 10B, and is provided so as to be inclined obliquely corresponding to the tubular portion 10B along the direction in which the pair of tubular portions 10B are arranged. The pair of tubular portions 10B of the refrigerant pipe 10 are joined to the joining portion 28 by brazing or the like. Further, the joint portion 28 is convex between the tubular portions 10B and protrudes toward the tubular portion 10B, and is fitted between the tubular portions 10B.
The tubular portion 10B of the refrigerant pipe 10 includes an inclined surface of a bracket 29 having a substantially triangular shape as viewed from above and provided below the joint portion 28 so as to protrude from the substrate housing portion 14 to the back side, and a sandwiching piece facing the inclined surface. 30 in a predetermined position and orientation.

Here, in the housing 23, a cooling block of metal (a metal having good thermal conductivity such as aluminum) is provided on the back surface 21 b side of the substrate 21 so as to contact the pair of tubular portions 10 </ b> B and the heat generating component 25 of the controller 12. Cooling body) 26 is provided.
The cooling block 26 is a block in which the first block 26 a attached to the refrigerant pipe 10, the second block 26 b attached to the heat generating component 25, and the first block 26 a and the second block 26 b are brought into contact with each other so as to be able to transfer heat. And a detachable screw 31.

  The first block 26a is provided obliquely with respect to the back surface 21b of the substrate 21 along the inclination direction of the joint portion 28, and is attached to the refrigerant pipe mounting surface (front surface) 26c attached to the tubular portion 10B of the refrigerant pipe 10; 2 has an opposing contact surface 26e that contacts the block 26b and a refrigerant pipe attaching / detaching screw 32 for detachably attaching the joint portion 28 to the refrigerant pipe attaching surface 26c.

The refrigerant pipe mounting surface 26 c has a shape corresponding to the joint portion 28 of the refrigerant pipe 10. That is, it has a shape that is convex toward the side surface 24 between the tubular portions 10B.
In the present embodiment, the opposing contact surface 26e has a curved surface shape that is convex from the joint portion 28 toward the back surface 21b of the substrate 21, but may be a mere flat surface or a step shape when viewed from above. It may be formed. In addition, a positioning protrusion 26g that protrudes in the width direction of the housing 23 is provided on the opposing contact surface 26e. The positioning protrusion 26g is provided at a position near the end away from the substrate 21 on the opposing contact surface 26e.

  The second block 26b has two heat generating component mounting surfaces (back surface) 26d to which the heat generating component 25 is mounted, and an opposing contact surface 26f that contacts the opposing contact surface 26e of the first block 26a.

  One (surface 26d1) of the two heat generating component mounting surfaces 26d faces the back surface 21b of the substrate 21, and the other (surface 26d2) faces the width direction of the housing 23. That is, the two heat generating component mounting surfaces 26 d are provided in a direction along the board 21 and a direction rising from the board 21. Here, the substrate accommodating portion 14 is provided with an opening 14 a, and the heat generating component 25 on the back surface 21 b of the substrate 21 protrudes to the back side of the substrate accommodating portion 14 through the opening 14 a. Then, each of the heat generating component 25 arranged along the substrate 21 and mounted on the substrate 21 and the heat generating component 25 arranged upright from the substrate 21 and mounted on the substrate 21 are each heat generating component mounting surface 26d. Are attached by mounting screws (not shown).

  The opposing contact surface 26f has a shape along the opposing contact surface 26e. That is, in the present embodiment, a curved surface that is concave toward the back surface 21 b of the substrate 21 is formed. Thereby, the opposing contact surface 26f and the opposing contact surface 26e come into surface contact. When the opposing contact surface 26f and the opposing contact surface 26e come into surface contact, the end of the second block 26b on the side away from the substrate 21 comes into contact with the positioning projection 26g.

  The block attaching / detaching screw 31 is disposed at a position corresponding to the attaching / detaching through hole 27 penetrating the substrate 21. The head portion 31 a of the block attaching / detaching screw 31 is exposed on the surface 21 a of the substrate 21. The block attaching / detaching screw 31 passes through the second block 26b and is screwed into the first block 26a, thereby fixing the second block 26b and the first block 26a in a state where the opposing contact surfaces 26f and 26e are in contact with each other. doing. Accordingly, the block attaching / detaching screw 31 has a head portion 31a smaller than the attaching / detaching through hole 27 so as to be able to pass through the attaching / detaching through hole 27 of the substrate 21 from the surface 21a side of the substrate 21. Thereby, the block attaching / detaching screw 31 can be operated from the surface 21a side of the substrate 21, and the first block 26a and the second block 26b can be attached and detached.

Next, the joint portion 28 will be described in detail with reference to FIG.
The joint portion 28 is a metal member formed in a plate shape as described above. Although the shape of the junction part 28 is not specifically limited, For example, the flat-plate-shaped thing of the board thickness of 0.5 mm-10 mm can be used. Moreover, the joining part 28 consists of the same kind of metal as the refrigerant | coolant piping 10, for example, when the refrigerant | coolant piping 10 consists of copper pipes, it is good to consist of copper or a copper base alloy.
The pipe wall of the refrigerant pipe 10 is joined to one surface of the joint portion 28 by brazing. The braze 34 is preferably made of a metal alloy of the same type as the refrigerant pipe 10. For example, when the refrigerant pipe 10 is made of a copper pipe, it may be brazed with a copper braze.
Brazing is performed on both the right and left sides orthogonal to the axial direction in a state where the refrigerant pipe 10 is disposed along the joint portion 28, and the substantially entire length of the facing portion between the refrigerant pipe 10 (tubular portion 10 </ b> B) and the joint portion 28. It is formed continuously over.
The other surface of the plate-like joint portion 28 is in contact with the refrigerant pipe mounting surface (surface) 26c of the first block 26a.

  A member including the tubular portion 10 </ b> B that is a part of the refrigerant pipe 10, the joint portion 28, and the cooling block 26 formed in this manner is referred to as a composite tube 22.

Next, a method for manufacturing such a composite tube 22 will be described.
First, the pipe wall of the refrigerant pipe 10 is joined to one surface of the plate-like joint portion 28 by brazing. Brazing may be performed continuously over the entire region in the extending direction of the joint portion 28 or may be performed at intervals.
After that, as shown in FIG. 5, the refrigerant pipe mounting surface 26c of the first block 26a formed in advance is brought into contact with the other surface of the joint portion 28 so as to be able to transfer heat. Thereby, the composite tube 22 is manufactured.

  According to the air conditioner 1 of the present embodiment described above, the pipe wall of the metal refrigerant pipe 10 is joined to one surface of the joint portion 28 formed of the same kind of metal, and the other surface of the joint portion 28. Are stacked on the cooling block 26. Therefore, the pipe wall of the refrigerant pipe 10 does not directly contact the cooling block 26.

Therefore, even if the joint portion 28 and the cooling block 26 made of different metals are in direct contact, different metal contact corrosion occurs in the joint portion 28 and the cooling block 26, and no different metal contact corrosion occurs in the refrigerant pipe 10. Therefore, no matter what kind of metal the cooling block 26 is made of, it is possible to prevent the refrigerant pipe 10 from causing contact with different metals.
Accordingly, it is possible to prevent the refrigerant pipe 10 from being damaged due to corrosion and flowing out of the refrigerant during use, and the durability of the refrigerant pipe 10 can be improved.
Further, even when the joint portion 28 is corroded, the corrosion can be prevented from proceeding to the refrigerant pipe 10 by replacing the joint portion 28.

  According to the composite pipe 22 of the present embodiment, since the joint portion 28 and the refrigerant pipe 10 are joined by brazing, the facing portion between one surface of the joint portion 28 and the refrigerant pipe 10 is interposed via the braze 34. Closely joined. Therefore, it is easy to ensure sufficient thermal conductivity between one surface of the joint portion 28 and the refrigerant pipe 10.

  Further, since the plate-like joint portion 28 and the cooling block 26 are attached in contact with each other, the contact area between the joint portion 28 and the cooling block 26 can be increased. Therefore, it is possible to ensure sufficient thermal conductivity between the refrigerant pipe 10 and the cooling block 26. Therefore, it is possible to ensure sufficient thermal conductivity between the refrigerant pipe 10 and the cooling block 26. Therefore, it is not always necessary to provide a heat transfer promoting member such as a heat transfer sheet or grease between the joint portion 28 and the cooling block 26.

  Furthermore, since the joint portion 28 is fixed to the refrigerant pipe mounting surface 26c with the screw for attaching / detaching the refrigerant pipe 32, the contact state between the cooling block 26 and the joint portion 28 can be further improved.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes design changes and the like within a scope not departing from the gist of the present invention. .

  For example, the part of the refrigerant pipe 10 disposed in contact with the cooling block 26 is not necessarily limited to the part 10A between the electronic expansion valve 6 and the indoor heat exchanger 8, and the heat generating component provided on the controller 12 The other part of the refrigerant pipe 10 maintained at a temperature at which 25 can be cooled may be used. For example, the site | part between the electronic expansion valve 6 and the outdoor heat exchanger 5 may be sufficient. That is, the composite pipe 22 can be applied to various parts in the refrigeration cycle 11.

  Moreover, although the above demonstrated the air conditioner 1 as an example of a freezing apparatus, you may apply said structure to the other freezing apparatus which has a refrigerating cycle.

DESCRIPTION OF SYMBOLS 1 ... Air conditioner 2 ... Compressor 3 ... Four-way switching valve 4 ... Outdoor fan 5 ... Outdoor heat exchanger 6 ... Electronic expansion valve 7 ... Indoor fan 8 ... Indoor heat exchanger 9 ... Accumulator 10 ... Refrigerant piping 10A ... Part 10B ... Tubular part 12 ... Controller 13 ... Outdoor unit 14 ... Board housing part 14a ... Opening part 21 ... Board (circuit board)
21a ... front surface 21b ... back surface 22 ... composite tube 23 ... casing 24 ... side surface 25 ... heat generating component 26 ... cooling block (cooling body)
26a ... 1st block 26b ... 2nd block 26c ... Refrigerant piping attachment surface (surface)
26d (26d1, 26d2) ... Heating component mounting surface (back surface)
26e ... opposing contact surface 26f ... opposing contact surface 27 ... detachable through hole 28 ... joint 29 ... bracket 29a ... inclined surface 30 ... clamping piece 31 ... block attaching / detaching screw 31a ... head 32 ... refrigerant pipe attaching / detaching screw 34 ... Wax

Claims (5)

Metal refrigerant piping,
A plate-like joint formed of the same kind of metal as the refrigerant pipe and having a wall of the refrigerant pipe joined to one surface;
A metal cooling body having a surface that contacts the other surface of the joint, and a back surface that is provided on the opposite side of the surface and contacts the heat-generating component;
A composite tube comprising.   The composite pipe according to claim 1, wherein the refrigerant pipe is joined to one surface of the joint by brazing.   The composite pipe according to claim 1, wherein the joint is screwed to the cooling body. The composite pipe according to any one of claims 1 to 3,
A heat generating component mounted on a circuit board provided so that the back surface of the cooling body is in contact;
A refrigeration apparatus comprising: It is a manufacturing method of the composite pipe according to any one of claims 1 to 3,
Joining the pipe wall of the refrigerant pipe to one surface of the joint formed of the same kind of metal as the refrigerant pipe;
Bringing the cooling body into contact with the other surface of the joining portion; and
A method of manufacturing a composite tube comprising:

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