WO2021109287A1

WO2021109287A1 - Joint structure for refrigerant pipe

Info

Publication number: WO2021109287A1
Application number: PCT/CN2019/127844
Authority: WO
Inventors: 李贤弘
Original assignee: 宁波慧创新材料科技有限公司; 李贤弘
Priority date: 2019-12-05
Filing date: 2019-12-24
Publication date: 2021-06-10
Also published as: CN110805774A

Abstract

A joint structure for a refrigerant pipe, comprising a nut (160), an outer casing (150), a refrigerant pipe (140), an inner casing (130), and a seal (120). A horn-shaped first flare part (151) is provided on the top of the outer casing (150), a second flare part (141) is provided on the top of the refrigerant pipe (140), and a third flare part (131) is provided on the top of the inner casing (130), the first flare part (151) being provided on the outside of the second flare part (141) and the third flare part (131) being provided on the inside of the second flare part (141). A resin layer is coated on the exterior of the refrigerant pipe (140). The seal (120) comprises an expanding part (121) that cooperates with the third flare part (131), an extending part (122) being provided downwards on the top of the expanding part (121), and the third flare part (131) being sandwiched between the extending part (122) and the expanding part (121). The described structure allows an aluminum pipe to not be in contact with a copper joint, preventing the occurrence of electro-chemical corrosion, improving the useful lifespan of the aluminum pipe. At the same time, by means of designing the structure of the seal (120), an extending part (122) is provided, and thus folding will not occur, and at the same time, the extending part (122) cooperating with the expanding part (121) increases bonding between the seal (120) and the inner casing (130), preventing the occurrence of low installation effectiveness because of a missing seal (120).

Description

Joint structure of refrigerant pipe

This application claims the priority of the invention patent application whose application date is December 5, 2019, the application number is 201911233044.8, and the invention title is "a joint structure of a refrigerant pipe", the entire content of which is incorporated into this application by reference .

Technical field

The invention relates to the installation of a refrigeration system of air conditioning equipment, and in particular to a joint structure of a refrigerant pipe.

Background technique

In daily life and industrial production, the air conditioner has become an indispensable electrical appliance. The air conditioner is divided into an internal unit and an external unit. The internal unit and the external unit flow the refrigerant inside through pipes to realize the heat transfer between indoor and outdoor. Copper pipes are widely used in air-conditioning condensers because of their good thermal conductivity. Copper pipes are relatively expensive metal materials. In order to save costs, the use of aluminum pipes instead of copper pipes in the field of air-conditioning technology has attracted more and more attention.

The aluminum replacement copper technology is used in the air conditioner condenser. The outer surface of the aluminum tube needs to be coated with a layer of resin to achieve the same effect as the copper tube. However, the joints between the inner machine and the aluminum tube and the outer machine and the aluminum tube are still used Copper joints are used for connection, and the aluminum pipe part needs to be flared. The copper joint and the aluminum pipe are made of different metals, which makes the contact between the two prone to electrochemical corrosion, and the sealing effect is reduced over time. At present, other materials are usually used Used to prevent contact between the two, while adding a sealing ring to seal, but in the process of use, because the sealing ring is usually an annular gasket or a tapered gasket, the valve is threaded when it comes into contact with the nut Fixed, and the bottom of the valve needs to be in contact with the sealing ring, which will easily cause the sealing ring to wrinkle after rotation, resulting in poor sealing effect. At the same time, the sealing ring is easy to lose during the installation process, which affects the installation progress.

Summary of the invention

The technical problem to be solved by the present invention is to provide a joint structure of the refrigerant pipe, which can prevent the chemical corrosion phenomenon caused by the contact between aluminum and copper, while ensuring that the sealing ring is not easily damaged, improving the sealing effect and reducing the replacement frequency.

The technical solution adopted by the present invention to solve its technical problem is: a refrigerant pipe joint structure, including a nut connected with a valve, an outer sleeve arranged in the nut, a refrigerant pipe arranged inside the outer sleeve, and a refrigerant pipe arranged in the refrigeration The inner sleeve inside the agent tube and the seal provided on the inner sleeve, a flared first expansion part is arranged on the top of the outer sleeve, and a second expansion part is arranged on the top of the refrigerant tube , A third expansion part is arranged on the top of the inner sleeve, the first expansion part is arranged outside the second expansion part, and the third expansion part is arranged inside the second expansion part , The outside of the refrigerant pipe is coated with a layer of resin, the sealing member includes an expansion part that cooperates with the third expansion part, and a protruding part is arranged downward on the top of the expansion part, and the expansion part The third expansion part is clamped by the outlet part and the expansion part.

More specifically, a protrusion is provided on the inner side of the extension part, and the protrusion is clamped under the top of the third tube expansion part.

More specifically, the protrusions are arranged in a ring shape and are arranged along the central axis of the protrusion.

More specifically, at least two of the protrusions are provided and are evenly distributed along the central axis of the protrusion.

More specifically, the extension portion is inclined toward the refrigerant tube side.

More specifically, a fourth expansion part is provided at the bottom of the outer sleeve, and the outer sleeve is fixed inside the nut through the first expansion part and the fourth expansion part.

More specifically, a round chamfer is provided on the edge of the inner hole at the bottom of the nut, and the fourth tube expanding portion is matched with the round chamfer.

More specifically, the refrigerant tube is an aluminum tube, and the outer tube and the inner tube are made of aluminum alloy or stainless steel.

More specifically, the lower part of the inner sleeve is an insertion part into which the refrigerant tube is inserted, and the diameter of the insertion part gradually increases from bottom to top.

The beneficial effects of the present invention are: through the above structure, the aluminum tube and the copper joint are not in contact to prevent the occurrence of electrochemical corrosion, and the service life of the aluminum tube is increased. At the same time, the structure of the sealing member is designed to have an extension part. The occurrence of wrinkles can improve the sealing effect, and at the same time, the extension part cooperates with the third expansion part to improve the combination of the sealing element and the inner sleeve, preventing the sealing element from being lost and the installation efficiency being low, and it is convenient to replace.

Description of the drawings

Figure 1 is an exploded schematic diagram of the joint structure of the present invention;

Figure 2 is a schematic diagram of the assembled structure of the joint structure of the present invention;

Fig. 3 is a schematic diagram of an enlarged structure of part A in Fig. 2;

4 is a schematic sectional view of the structure of the seal of the present invention;

Fig. 5 is a schematic cross-sectional view of the outer sleeve of the present invention.

In the figure: 110, valve; 120, seal; 121, expansion part; 122, extension part; 123, protrusion; 130, inner sleeve; 131, third expansion part; 132, insertion part; 140, refrigeration Agent tube; 141, second expansion part; 150, outer sleeve; 151, first expansion part; 152, fourth expansion part, 160, nut.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings.

As shown in Figure 1, Figure 2, Figure 3, and Figure 4, a refrigerant pipe joint structure includes a nut 160 connected to the valve 110, an outer sleeve 150 arranged in the nut 160, and a refrigeration pipe 150 arranged inside the outer sleeve 150. The agent pipe 140, the inner sleeve 130 arranged inside the refrigerant pipe 140, and the seal 120 arranged on the inner sleeve 130. A horn-shaped first expansion part 151 is arranged on the top of the outer sleeve 150, and The top of the refrigerant pipe 140 is provided with a second expansion part 141, the top of the inner sleeve 130 is provided with a third expansion part 131, and the first expansion part 151 is arranged at the second expansion part 141 On the outside, the third expansion pipe 131 is arranged on the inside of the second expansion pipe 141, the refrigerant pipe 140 is coated with a resin layer, and the sealing member 120 includes the third expansion pipe and the third expansion pipe. 131 mating expansion part 121, the top of the expansion part 121 is provided with a protruding part 122 downwards, the protruding part 122 and the expansion part 121 clamp the third expansion part 131, the sealing member 120 is made of iron Made of Flon material.

The inner hole of the nut 160 is divided into two parts, the upper part is a straight cylindrical thread, the lower part is contracted, and the first expansion part 151 of the outer tube 150 matches the contraction; the refrigerant pipe 140 is inserted through the first expansion part 151, The inside of the first expansion part 151 is matched with the outside of the second expansion part 141 on the refrigerant pipe 140, and then the inner sleeve 130 is inserted into the refrigerant pipe 140, so that the second expansion part 141 and the inner sleeve The third expansion part 131 on the tube 130 is matched; and before the inner sleeve 130 is inserted, the sealing member 120 needs to be assembled to the third expansion part 131, and only the extension 122 needs to be removed from the third expansion part 131. Insert from the outside, so that the top of the third expansion part 131 is inserted between the expansion part 121 and the extension part 122, and the expansion part 121 and the extension part 122 form a clamping state for the third expansion part 131, and finally the valve 110 Insert the nut 160 and tighten it. During the tightening process, the extension 122 is located below the third expansion part 131 and does not contact the valve 110, so that the seal 120 will not be wrinkled when the valve 110 is tightened. At this time, the bottom of the valve 110 presses the sealing element 120 and causes the sealing element 120 to expand outward, thereby sealing the refrigerant pipe 140.

Based on the above structure, the design of the extension 122 can have various forms. For example, the extension 122 is an annular body, or a plurality of separated extensions 122 are evenly distributed; at the same time, in order to improve the seal 120 and The tightness of the connection between the third tube expansion parts 131 can be connected in two ways. In the first way, the extension 122 is designed to be inclined toward the refrigerant tube 140, and the inclination angle should not be too large to make It only needs to be able to catch the third expansion part 131. The inclined structure of the extension part 122 can be used in conjunction with a plurality of separated extension parts 122, and the effect is better; the second type, the extension part 122 A protrusion 123 is provided on the inner side (that is, near the side of the refrigerant pipe) to ensure that the protrusion 123 is just clamped under the third tube expansion part 131 after the assembly is completed, and the protrusion 123 can be arranged as the entire ring body And around the central axis of the extension 122, the number of protrusions 123 can also be at least two and evenly distributed with the central axis of the extension 122 as the axis.

As shown in FIG. 5, a fourth tube expansion part 152 is provided at the bottom of the outer tube 150, and the outer tube 150 is fixed inside the nut 160 through the first tube expansion part 151 and the fourth tube expansion part 152. When processing the fourth expansion part 152, first put the outer sleeve 150 into the constriction of the nut 160, and one end of it extends to the outside of the nut 160. At this time, the pipe extending to the outside of the nut 160 is expanded to form the second The four expanded pipe portions 152 complete the fixed installation of the outer sleeve 150; further, a round chamfer is provided on the edge of the inner hole at the bottom of the nut 160, and the fourth pipe expanded portion 152 is matched with the round chamfer to improve the matching degree.

The lower part of the inner sleeve 130 is the insertion part 132 into which the refrigerant tube 140 is inserted. For ease of operation, the outer diameter of the insertion part 132 is smaller than the inner diameter of the refrigerant tube 140, and the outer diameter of the insertion part 132 can also be gradually increased from bottom to top. The increase can not only achieve the insertion effect but also ensure the tight fit between the inner sleeve 130 and the refrigerant pipe 140.

In order to prevent electrochemical corrosion, when the refrigerant tube 140 is an aluminum tube, the outer tube 150 and the inner sleeve 130 are made of aluminum alloy or stainless steel. In this solution, stainless steel is selected; the role of the inner sleeve 130 Separate the aluminum tube from the copper valve 110; because the aluminum tube is provided with a resin layer, the resin layer will partly fall off after the tube is expanded or used for a long time. Without the protection of the outer tube 150, the aluminum tube will directly contact When the nut 160 made of copper material contacts, electrochemical corrosion occurs. The effect of the outer sleeve 150 is consistent with that of the inner sleeve 130, which separates the aluminum pipe from the nut 160 made of copper material, which improves the service life.

In summary, by improving the shape of the sealing element 120, the sealing element 120 and the inner sleeve 130 can be tightly combined to improve the sealing effect. At the same time, the sealing element 120 is not prone to wrinkles or loss. The buckle form of the outlet 122 is designed to facilitate later installation operations. The step of combining the seal 120 and the inner sleeve 130 can be completed before leaving the factory; at the same time, the first expansion part 151 and the fourth expansion part of the outer sleeve 150 The cooperation of 152 makes the outer tube 150 fixed on the nut 160, and the assembly steps can also be completed before leaving the factory, which reduces the steps for door-to-door installation in the later stage, simplifies the installation process, and improves the installation efficiency.

It should be emphasized that the above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are all It still falls within the scope of the technical solution of the present invention.

Claims

A joint structure of a refrigerant pipe includes a nut (160) connected with a valve (110), an outer sleeve (150) arranged in the nut (160), and a refrigerant pipe (140) arranged inside the outer sleeve (150) ), an inner sleeve (130) arranged inside the refrigerant tube (140), and a seal (120) arranged on the inner sleeve (130), and a horn-shaped second tube is arranged on the top of the outer sleeve (150) An expansion part (151), a second expansion part (141) is arranged on the top of the refrigerant pipe (140), and a third expansion part (131) is arranged on the top of the inner sleeve (130) , The first expansion part (151) is arranged on the outside of the second expansion part (141), and the third expansion part (131) is arranged on the inside of the second expansion part (141), which is characterized by The refrigerant pipe (140) is coated with a layer of resin, and the sealing member (120) includes an expansion part (121) that cooperates with the third expansion part (131). The top of the portion (121) is provided with a protruding portion (122) downward, and the protruding portion (122) and the expanding portion (121) sandwich the third expanding portion (131).
The joint structure of the refrigerant pipe according to claim 1, wherein a protrusion (123) is provided on the inner side of the extension (122), and the protrusion (123) is clamped on the third expansion tube. Section (131) below the top.
The joint structure of the refrigerant pipe according to claim 2, wherein the protrusion (123) is arranged in a ring shape and is arranged along the central axis of the extension (122).
The joint structure of the refrigerant pipe according to claim 2, wherein at least two protrusions (123) are provided and are evenly distributed along the central axis of the extension (122).
The joint structure of the refrigerant pipe according to claim 1, wherein the extension (122) is inclined to the refrigerant pipe (140) side.
The joint structure of the refrigerant pipe according to claim 1, characterized in that a fourth expansion part (152) is provided at the bottom of the outer sleeve (150), and the fourth expansion part (152) passes through the first expansion part (151). ) And the fourth expansion part (152) fix the outer sleeve (150) inside the nut (160).
The joint structure of the refrigerant pipe according to claim 6, characterized in that a round chamfer is provided on the edge of the inner hole at the bottom of the nut (160), and the fourth pipe expansion part (152) is round and chamfered. Cooperate.
The joint structure of the refrigerant pipe according to claim 1, wherein the refrigerant pipe (160) is an aluminum pipe, and the outer sleeve (150) and the inner sleeve (130) are both aluminum alloy Or made of stainless steel.
The refrigerant pipe joint structure according to claim 1, wherein the lower part of the inner sleeve (130) is an insertion portion (132) into which the refrigerant pipe (140) is inserted, and the insertion portion ( 132) The diameter gradually increases from bottom to top.