Connecting pipe for refrigerating system, valve device and heat exchanger

Abstract

The utility model discloses a connecting pipe for a refrigerating system and a valve device and a heat exchanger using the connecting pipe, the connecting pipe comprises a stainless steel pipe base body and a copper connecting layer covering a welding section, the copper connecting layer is provided with a thin wall part and a connecting part, the thickness of the thin wall part is 20-80 microns, and the thickness of the connecting part is 20-80 microns. Compared with a copper connector and a copper bush in the prior art, the copper connecting layer can reduce the using amount of copper, the inner surface or the outer surface of the welding section is covered with the copper connecting layer in the whole circle through the arrangement of the connecting part, and the welding reliability of the connecting pipe and an external system pipeline can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to refrigeration accessories technical field especially, relates to a pipe, valve device and heat exchanger for refrigeration system. BACKGROUND

[0002] More and more accessories used in refrigeration system adopt stainless steel material, but, the host factory still adopts red copper pipe joint at present, it is difficult to realize the connection between stainless steel pipe joint and red copper pipe joint through ordinary flame brazing, generally solves the welding problem by brazing a copper pipe at the welding position of stainless steel pipe joint first.But the material cost of copper joint and copper bushing is still higher. SUMMARY

[0003] The application provides a pipe for refrigeration system, including pipe base body, the material quality of pipe base body is stainless steel, the pipe base body includes welding section,

[0004] Still include connecting layer, the material quality of connecting layer is copper, the inner surface or the outer surface of welding section is covered to connecting layer, connecting layer is welded with welding section fixed, connecting layer includes thin wall part and junction, the thickness of thin wall part is 20muM-80muM, the thickness of junction is greater than the thickness of thin wall part.

[0005] The pipe for refrigeration system provided by the application, the valve device and the heat exchanger with the pipe, including stainless steel pipe base body and copper connecting layer covering welding section, copper connecting layer has thin wall part and junction, the thickness of thin wall part is 20muM-80muM, the copper connecting layer compared with copper joint and copper bushing in the background art can reduce the amount of copper, and by setting the junction, the inner surface or the outer surface of the welding section is covered with copper connecting layer, the welding reliability of the pipe and the external system pipeline can be improved.

[0006] The application also provides a valve device for refrigeration system, comprising:

[0007] Valve body, the valve body is equipped with assembly part on it;

[0008] The pipe of the above technical solution, one end of the pipe away from the connecting layer is welded with the assembly part fixed.

[0009] The valve device provided by the application applies the pipe in the above technical solution, and the amount of copper can be reduced.

[0010] The application also provides a heat exchanger, comprising:

[0011] Heat exchanger body and the pipe of the above technical solution, the heat exchanger body is equipped with mounting part, one end of the pipe away from the connecting layer is welded with the mounting part fixed.

[0012] The heat exchanger provided by the present application applies the connecting pipe in the technical scheme, so that the amount of copper can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 The structure schematic diagram of the connecting pipe provided by the present application is shown in the figure;

[0014] Figure 2 The structure schematic diagram of the connecting pipe provided by the present application is shown in the figure; Figure 1 The enlarged schematic diagram of X in the figure;

[0015] Figure 3 The structure schematic diagram of the connecting pipe provided by the present application is shown in the figure; Figure 2 The schematic diagram of the deformation example of the structure shown in the figure;

[0016] Figure 4 The structure schematic diagram of the welding section in the figure; Figure 1 The structure schematic diagram of the welding section in the figure;

[0017] Figure 5 The local schematic diagram of the joint when the copper foil is assembled;

[0018] Figure 6 The structure schematic diagram of the valve device provided by the present application is shown in the figure;

[0019] Figure 7 The structure schematic diagram of the heat exchanger provided by the present application is shown in the figure.

[0020] Among them, the above-mentioned drawings include the following reference signs:

[0021] 1: connecting pipe;

[0022] 10: pipe base body;

[0023] 101: welding section;

[0024] 11: large diameter section;

[0025] 12: small diameter section;

[0026] 13: connecting section;

[0027] 14: expanding section;

[0028] 15: connecting layer;

[0029] 151: thin wall part;

[0030] 152: joint part;

[0031] 2: valve device;

[0032] 21: valve body;

[0033] 210: assembly part;

[0034] 3: heat exchanger;

[0035] 31: heat exchanger body;

[0036] 310: mounting portion. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the utility model is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model and not to limit the utility model.

[0038] Figure 1 Structure schematic view of the connecting pipe provided by the present application; Figure 2 is Figure 1 Enlarged schematic view of X in the middle; Figure 3 is Figure 2 Schematic view of a deformation example of the structure shown in the middle; Figure 4 is Figure 1 Structure schematic view of the welding section in the middle; Figure 5 Partial schematic view of the joint when the copper foil is assembled.

[0039] In order to realize the welding connection between the stainless steel valve and the copper connecting pipe of the main machine such as air conditioner and refrigerator, as described in the background art, the copper joint, copper bush and the like are usually welded at the connecting pipe welding section of the stainless steel valve, but the thickness of the copper joint and copper bush is generally above 300 μm, and the material cost is relatively high.

[0040] Based on this, the present application provides a connecting pipe for refrigeration system, comprising: a pipe base body 10 and a connecting layer 15, the material of the pipe base body 11 is stainless steel, and the pipe base body 11 comprises a welding section 101 welded with the copper connecting pipe of air conditioner, refrigerator and the like. The material of the connecting layer 15 is copper, the connecting layer 15 is annular and extends along the circumferential direction of the pipe base body 11, and the connecting layer 15 is covered on the inner surface or outer surface of the welding section 101 by welding. The connecting layer 15 specifically comprises a thin wall part 121 and a joint part 122, and the thickness of the joint part 122 is greater than the thickness of the thin wall part 121.

[0041] In the embodiment, the base material of the connecting layer 15 specifically adopts copper foil, the thickness of the copper foil is between 20 μm and 80 μm (including the numbers), the copper foil is cut to a certain width and length, and after cutting, it is wound to an annular structure, and finally the welding section 101 of the pipe base body 10 is welded, and the copper layer covered on the inner surface or outer surface of the welding section 101 after welding is the connecting layer 15. In the material selection process, it is found that if the thickness of the copper foil is less than 20 μm, the copper foil base material is too soft, and after winding, the tension of the outer expansion or the inner contraction is lost, that is, the assembly efficiency of the copper foil and the connecting pipe 1 will be reduced; if the thickness of the copper foil exceeds 80 μm, the too thick copper foil is not easy to bend and wind, which increases the processing difficulty, and the material cost also rises.

[0042] The embodiment adopts a copper foil with a thickness of 20-80 μm, which forms the copper connecting layer 15 after being welded with the welding section 101. The thickness of the thin wall part 151 of the connecting layer 15 is between 20-80 μm, which can reduce the amount of copper compared with the copper joint and copper bush in the background art, and the welding reliability of the connecting pipe 1 and the external pipeline can be improved by setting the joint part 152 to cover the inner surface or the outer surface of the welding section 101 with the copper connecting layer 15.

[0043] On the other hand, the connecting layer 15 is formed on the surface of the welding section 101 by welding, which can ensure high bonding strength and avoid peeling in the subsequent manufacturing process, and will not cause copper brittle failure.

[0044] Further, as shown in Figure 4 , the joint part 152 is the joint part of the connecting layer 15, and the thin wall part 151 is the area of the connecting layer 15 except the joint part 152, that is, the area where the thin wall part 151 is distributed. In the axial direction of the pipe base body 10, the above-mentioned joint part 152 extends from one end of the welding section 101 to the other end of the welding section 101 without being disconnected in between. By such arrangement, it is ensured that the joint part 152 maintains a certain width D in the axial direction of the pipe base body 10, that is, the connecting layer 15 can be arranged to cover the inner surface or the outer surface of the welding section 101 by setting the joint part 152, which can further improve the welding reliability of the connecting pipe 1 and the external pipeline.

[0045] In addition, it should be noted that, taking the example of the connecting layer 15 covering the inner surface of the welding section 101, the area of the inner surface covered by the joint part 152 is smaller than the area of the thin wall part 151, so that the thickness of the connecting layer 15 can be ensured to be generally uniform.

[0046] As shown in Figure 4 , Figure 5 , when the copper foil is assembled with the connecting pipe 1, if the copper foil cooperates with the inner surface of the connecting pipe 1, the length of the copper foil is greater than the circumference of the inner circumference of the welding section 101, so that the copper foil can be wound more than one turn with the head and tail partially overlapping, and the overlapping part after welding forms the joint part 152 of the connecting layer 15. If the copper foil cooperates with the outer surface of the connecting pipe 1, the length of the copper foil is also greater than the circumference of the outer circumference of the welding section 101.

[0047] By the above-mentioned overlapping of the head and tail, the thickness of the joint part 152 is generally about twice the thickness of the thin wall part 151, but the thickness of the copper foil will change slightly due to welding, that is, the connecting layer 15 formed after welding will change slightly compared with the original thickness of the base copper foil. Considering the above factors, in the embodiment, the thickness of the joint part 152 is at least 1.8 times the thickness of the thin wall part 151.

[0048] In some specific implementations, the thickness of the thin wall portion 151 is preferably controlled between 20 μm and 60 μm. The thickness within this range can further reduce the material cost while ensuring the assembly efficiency.

[0049] On the other hand, the thickness difference between any two points of the thin wall portion 151 is not more than 5%. The thickness uniformity of the thin wall portion 151 of the connection layer 15 formed by using the copper foil as the base material is easy to be ensured, which is beneficial to the subsequent assembly with the copper connection pipe in the system.

[0050] In some specific implementations, the width D of the transition portion 152 along the circumferential direction of the pipe base body 10 is greater than 0.05 mm. In this way, the connection layer 15 can cover the inner surface or the outer surface of the welding section 101 in the circumferential direction of the pipe base body 10.

[0051] The shape of the transition portion 152 of the connection layer 15 described above can have various forms. For example, it can be a rectangle as shown in Figure 4 When the interface shape of the copper foil forming the transition portion 152 is other shapes, the shape of the transition portion 152 can also be a parallelogram or an irregular figure, etc.

[0052] In some specific implementations, as shown in Figure 1 The pipe base body 10 includes a large-diameter section 11, a small-diameter section 12 and a transition section 13. The inner diameter of the large-diameter section 11 is greater than that of the small-diameter section 12. The transition section 13 connects the large-diameter section 11 and the small-diameter section 12. The connection layer 15 covers the inner surfaces of the large-diameter section 11 and the small-diameter section 12. That is, when the connection layer 15 covers the large-diameter section 11, the large-diameter section 11 serves as the welding section 101 and is welded with other copper connection pipes in the system. When the connection layer 15 covers the small-diameter section 12, the small-diameter section 12 serves as the welding section 101 and is welded with other copper connection pipes in the system. It should be noted that since the connection layer 15 covers the inner surfaces of the large-diameter section 11 and the small-diameter section 12, other copper connection pipes in the system are inserted into the connection pipe 1 for welding, so that the connection layer 15 made of copper material is welded with the copper connection pipes in the system. The welding is convenient, and the material cost is low.

[0053] As shown in Figure 3 The pipe base body 10 further includes an expanded-diameter section 14 connected to one end of the large-diameter section 11 away from the transition section 13. The inner diameter of the expanded-diameter section 14 is greater than that of the large-diameter section 11. The connection layer 15 covers the inner surface of the large-diameter section 11 and the inner surface of the expanded-diameter section 14.

[0054] The application further provides a valve device, comprising:

[0055] A valve body 21 is provided with an assembly portion 210.

[0056] The connection pipe 1 is welded and fixed to the valve body 21 at the end away from the connecting layer 15 through the mounting hole provided on the assembly part 210.

[0057] Referring to Figure 6 , Figure 6 The structure diagram of the valve device provided by the application is shown in the figure, wherein 21 is a valve body, 1 is a connection pipe, and the connection pipe 1 is welded and fixed to the valve body 21 through the mounting hole provided on the assembly part 210. For example, the end of the connection pipe 1 away from the connecting layer 15 is inserted into the mounting hole, and the connection pipe 1 and the assembly part 210 are welded.

[0058] The specific structure of the valve body 21 is not particularly limited in the application, which can be a reversible valve, a four-way valve or the like used in a refrigeration system. The end of the connection pipe 1 away from the connecting layer 15 can be, for example, a small-diameter section 12 as shown in the figure, and the small-diameter section 12 is welded and fixed to the valve body 21 through the assembly part 210. Figure 1

[0059] Since the valve device 2 comprises the connection pipe 1 of the above-mentioned scheme, the welding efficiency of the valve device 2 and the system copper connection pipe can be improved while ensuring the reduction of the connection pipe 1.

[0060] The application further provides a heat exchanger, comprising:

[0061] The heat exchanger body 31 and the connection pipe 1 of the above-mentioned scheme are provided, and the heat exchanger body 31 is provided with a mounting part 310, and the end of the connection pipe 1 away from the welding section 101 is welded and fixed to the heat exchanger body 31 through the mounting part 310.

[0062] Referring to Figure 7 , Figure 7 The structure diagram of the heat exchanger provided by the application is shown in the figure, wherein 31 is a heat exchanger body, 310 is a mounting part, and the connection pipe 1 is welded and fixed to the heat exchanger body 31 through the mounting hole provided on the mounting part 310. For example, the end of the connection pipe 1 away from the connecting layer 15 is inserted into the mounting hole, and the connection pipe 1 and the mounting part 310 are welded.

[0063] The specific structure of the heat exchanger body 31 is not particularly limited in the application, which can be a plate heat exchanger. The end of the connection pipe 1 away from the welding section 101 can be, for example, a small-diameter section 12 as shown in the figure, and the small-diameter section 12 is welded and fixed to the heat exchanger body 31 through the mounting part 310. Figure 1

[0064] Since the heat exchanger 3 comprises the connection pipe 1 of the above-mentioned scheme, the welding efficiency of the heat exchanger 3 and the system copper connection pipe can be improved while ensuring the reduction of the connection pipe 1.

[0065] ​​The principle and implementation mode of the present application are described by using specific examples above, and the description of the above examples is only used to help understand the method of the present application and its core idea. It should be pointed out that, for ordinary skilled persons in the technical field, some improvements and modifications can be made to the present application without departing from the principle of the present application, and these improvements and modifications also fall within the protection scope of the present application.

Claims

1. A pipe for a refrigeration system, comprising a pipe base body, the pipe base body being made of stainless steel, the pipe base body comprising a welding section, characterized in that further comprising a connecting layer, the connecting layer being made of copper, the connecting layer covering an inner surface or an outer surface of the welding section, the connecting layer being welded and fixed with the welding section, the connecting layer comprising a thin wall section and an interface section, the thin wall section having a thickness of 20 μm to 80 μm, the interface section having a thickness greater than that of the thin wall section.

2. The spool of claim 1, wherein, In the axial direction of the pipe base body, the interface section extends from one end of the welding section to the other end of the welding section.

3. A spool as claimed in claim 1 or 2, characterised in that The thickness of the interface section is at least 1.8 times the thickness of the thin wall section.

4. A spool as claimed in claim 1 or 2, characterised in that The base material of the connecting layer is a copper foil, the copper foil being configured as a ring structure.

5. The spool of claim 4, wherein, The connecting layer covers the inner surface of the welding section, the length of the copper foil being greater than the circumference of the inner circumference of the welding section; Or, the connecting layer covers the outer surface of the welding section, the length of the copper foil being greater than the circumference of the outer circumference of the welding section.

6. A spool as claimed in claim 1 or 2, characterized in that The connecting layer covers the inner surface or the outer surface of the welding section, the thickness of the thin wall section being 20 μm to 60 μm, the thickness difference between any two points of the thin wall section being not more than 5%.

7. A spigot according to claim 1 or 2, characterised in that, The width of the interface section in the circumferential direction of the pipe base body is greater than 0.05 mm.

8. A spigot according to claim 1 or 2, characterised in that, The pipe base body comprises a large diameter section, a small diameter section and a transition section, the inner diameter of the large diameter section being greater than that of the small diameter section, the transition section connecting the large diameter section and the small diameter section, the connecting layer covering the inner surface of the large diameter section or the small diameter section, the large diameter section or the small diameter section serving as the welding section.

9. The spool of claim 8, wherein, The pipe base body further comprises an expanded diameter section, the expanded diameter section being connected to one end of the large diameter section away from the transition section, the inner diameter of the expanded diameter section being greater than that of the large diameter section, the connecting layer covering the inner surface of the large diameter section and the inner surface of the expanded diameter section.

10. A valve device for a refrigeration system, characterized by Comprising: a valve body, the valve body being provided with a fitting portion; The pipe according to any one of claims 1 to 9, one end of the pipe away from the connecting layer being welded and fixed with the fitting portion.

11. A heat exchanger, characterized by Comprising: a heat exchanger body and the pipe according to any one of claims 1 to 9, the heat exchanger body being provided with a mounting portion, one end of the pipe away from the connecting layer being welded and fixed with the mounting portion.

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