CN210509510U

CN210509510U - Resistance welding structure of exhaust pipe of refrigeration compressor

Info

Publication number: CN210509510U
Application number: CN201920568061.6U
Authority: CN
Inventors: 唐卫岗; 范仲华; 黄世盛; 陈融; 李江; 李志恒
Original assignee: HANGZHOU HUAGUANG ADVANCED WELDING MATERIALS CO Ltd
Current assignee: HANGZHOU HUAGUANG ADVANCED WELDING MATERIALS CO Ltd
Priority date: 2019-04-24
Filing date: 2019-04-24
Publication date: 2020-05-12
Anticipated expiration: 2029-04-24

Abstract

The utility model relates to a resistance welding structure of refrigeration compressor blast pipe, it is complicated for solving among the prior art refrigeration compressor blast pipe welding, problem with high costs, it is complicated to have proposed a technical scheme: a resistance welding structure of a refrigeration compressor exhaust pipe comprises an exhaust pipe and an end cover; the exhaust pipe is provided with a welding part; the end cover is provided with a connecting hole for connecting an exhaust pipe; the edge of the connecting hole is turned upwards to form a flange; the exhaust pipe penetrates through the connecting hole; the welding part is in contact connection with the lower end of the flanging through resistance welding. The utility model has unique structure, low cost, simplified process and reliable performance; the utility model discloses a mode that resistance welded is with blast pipe and end cover welding, and this kind of welding mode need not use the brazing filler metal, has practiced thrift the cost to welded reliability is high, is difficult for leaking.

Description

Resistance welding structure of exhaust pipe of refrigeration compressor

Technical Field

The utility model relates to a resistance welding structure, concretely relates to resistance welding structure of refrigeration compressor blast pipe.

Background

At present, an end cover and an exhaust pipe of a refrigeration compressor generally adopt a silver solder brazing structure (as shown in fig. 4), but silver solder is expensive and has higher requirements on welding temperature and welding technology during brazing, so that part of refrigeration compressor manufacturers hope to realize connection of the end cover and the exhaust pipe by adopting a mode other than brazing.

Some manufacturers start to adopt a direct resistance welding mode of a copper pipe and an end cover, but because the resistance welding is carried out in a mode of adopting a copper pipe welding surface to be on the upper part and adopting a mode of adopting a copper pipe welding surface to be on the lower part (as shown in figure 5), when the compressor works, an exhaust pipe has axial tension relative to the end cover due to internal working pressure, and the welding part is easy to have the defects of desoldering, leakage and the like under the tension.

The compressor adopts the technical scheme that a short steel sleeve and an end cover are connected in advance by resistance welding, and then an exhaust pipe copper pipe is inserted into the steel sleeve to be connected in a brazing mode (as shown in figure 6). The structure has the defects that the leakage risk is increased through secondary welding, the production and manufacturing process is complex, and the labor productivity cost and the material cost are increased.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the above-mentioned not enough that exists among the prior art, and provide a structural design is reasonable, reduce cost's the resistance welding structure of compressor vent-pipe. The utility model discloses can effectively simplify compressor blast pipe connection technology, reduction in production cost and labour drop into, effectively promote the yield.

The utility model provides a technical scheme that above-mentioned problem adopted is: the electric resistance welding structure of the exhaust pipe of the refrigeration compressor comprises the exhaust pipe and an end cover; the exhaust pipe is provided with a welding part; the end cover is provided with a connecting hole for connecting an exhaust pipe; the exhaust pipe penetrates through the connecting hole; and the welding part is connected to the connecting hole in an electric resistance welding manner. The utility model discloses when the operation, the resistance welding structure of refrigeration compressor blast pipe is in the use, and when the refrigerant that has pressure passed through the blast pipe, fluidic refrigerant can produce axial tension to the blast pipe, through the contact surface of welding position and end cover, can ensure that welding position is reliably connected, and the solder joint can bear very big tensile and the ability of shearing.

Preferably, in the present invention, the exhaust pipe is an integrally formed structure. The exhaust pipe is high in reliability and not easy to damage.

Preferably, in the utility model discloses in the welding part is the protruding bloated type structure that forms of outer wall of blast pipe. The expansion structure and the copper pipe are axially at a certain angle, and the expansion structure is matched with the edge of the flanging or the connecting hole, so that the exhaust pipe can bear large axial tension.

Preferably, in the present invention, the welding portion is located at a lower end of the end cap.

Preferably, in the present invention, the diameter of the welding portion is larger than the diameter of the connecting hole, and the contact area of the resistance welding is ensured.

Preferably, the end cap of the present invention is made of carbon steel.

Preferably, in the present invention, the exhaust pipe is made of copper or copper alloy, or copper-plated steel pipe.

Preferably, in the utility model, the edge of the connecting hole is turned upwards to form a flange; the welding part is positioned at the lower end of the flanging; and the welding part is in contact welding with the lower end of the flanging by resistance welding.

Preferably, in the present invention, the edge of the connecting hole may also be a chamfer or a circular arc.

Preferably, the lower plane of the flange and the lower plane of the end cover form an included angle α, and the degree of the included angle α is 0-60 degrees.

Preferably, the shape of the welding part is matched with the shape of the flanging in the utility model; the welding part is located at the bottom of the flanging. The design makes the blast pipe more firm with the welded part of end cover like this, and when the blast pipe received axial power, the turn-ups of end cover can increase the tensile ability of shearing of anti to the blast pipe.

Compared with the prior art, the utility model, have following advantage and effect: the utility model has unique structure, low cost, simplified process and reliable performance; the pressure applied to the middle exhaust pipe of the utility model can ensure the reliable performance of the welding part through the contact surface of the welding part and the flanging, and prevent the welding part from being broken due to overlarge external force; the bulging structure is at a certain angle with the axial direction of the copper pipe, and the angle of the bulging structure is matched with the angle of a flanging or a chamfer or an arc at the edge of a connecting hole, so that the exhaust pipe is increased in tensile shearing resistance when bearing axial tension, and the shearing resistance effect of a welding surface is improved. The utility model discloses a resistance welds blast pipe and end cover welding, and this kind of welding mode need not use the brazing filler metal, has practiced thrift the cost to welded reliability is high, is difficult for leaking.

Drawings

Fig. 1 is a schematic structural view of an electric resistance welding structure of a refrigeration compressor exhaust pipe in embodiment 1 of the present invention.

Fig. 2 is a schematic structural view of an electric resistance welding structure of a refrigeration compressor exhaust pipe in embodiment 2 of the present invention.

Fig. 3 is a schematic structural view of an end cap in embodiment 2 of the present invention.

Fig. 4 is a schematic view of a welding structure of silver solder brazing in the prior art.

Fig. 5 is a schematic view of a welding structure of direct resistance welding of a copper pipe and an end cover in the prior art.

Fig. 6 is a schematic view of a welding structure in which a copper pipe and an end cover are connected by a steel sleeve in the prior art.

In the figure: the structure comprises an exhaust pipe 1, a welding part 2, an end cover 3, a connecting hole 4, a flange 41, a connecting hole edge 42 and a refrigerant 5.

Detailed Description

The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.

Example 1.

Referring to fig. 1, the electric resistance welding structure of the exhaust pipe of the refrigeration compressor in the embodiment includes an exhaust pipe 1 and an end cover 3; the exhaust pipe 1 is of an integrally formed structure; the exhaust pipe 1 is provided with a welding part 2; the welding part 2 is an expansion structure formed by the bulge of the outer wall of the exhaust pipe 1; the welding part 2 is positioned at the lower end of the exhaust pipe 1; the diameter of the welding part 2 is larger than that of the connecting hole 4; the exhaust pipe 1 is made of copper or copper alloy or copper-plated steel pipe.

In the embodiment, the end cover 3 is made of carbon steel, the end cover 3 is provided with a connecting hole 4 for connecting the exhaust pipe 1, the edge of the connecting hole 4 is turned upwards to form a flange 41, the exhaust pipe 1 penetrates through the connecting hole 2, the welding part 2 is connected to the flange 41 in an electric resistance welding mode, the welding part 2 is located on the lower portion of the flange 41, an included angle α is formed between the lower plane of the flange 41 and the lower plane of the end cover 3, and the included angle α is 0-60 degrees.

The resistance welding structure of the exhaust pipe of the refrigeration compressor in the embodiment is only required to be installed in the following steps: 1) applying pressure to the welding part 2 of the exhaust pipe 1 to enable the welding part 2 to be tightly attached to the flanging 41; 2) passing a large current between the welding part 2 and the contact surface of the flanging 41, and utilizing the resistance of metal electrification to thermally melt the metal of the contact surface; 3) and the high-efficiency and reliable welding interface can be realized after the molten metal on the contact surface is solidified by keeping the pressure power off. The welding mode does not need brazing filler metal, saves cost, and has high welding reliability and difficult leakage.

In the use process of the resistance welding structure of the exhaust pipe of the refrigeration compressor in the embodiment, when the refrigerant 5 passes through the exhaust pipe 1, the refrigerant 5 of the fluid can generate axial tension on the exhaust pipe 1, the tension is transmitted to the end cover 3 through the contact surface of the welding part 2 and the flanging 41, the reliable performance of the welding part can be ensured, the welding part is prevented from being detached due to overlarge external force, due to the existence of the included angle α, when the exhaust pipe 1 bears the axial tension, the shearing force applied by the end cover 3 is reduced, and the shearing resistance effect of the welding surface is improved.

Example 2.

Referring to fig. 2-3, the electric resistance welding structure of the exhaust pipe of the refrigeration compressor in the embodiment includes an exhaust pipe 1 and an end cover 3; the exhaust pipe 1 is of an integrally formed structure; the exhaust pipe 1 is provided with a welding part 2; the welding part 2 is an expansion structure formed by the bulge of the outer wall of the exhaust pipe 1; the welding part 2 is positioned at the lower end of the exhaust pipe 1; the diameter of the welding part 2 is larger than that of the connecting hole 4; the exhaust pipe 1 is made of copper or copper alloy or copper-plated steel pipe.

In the embodiment, the end cover 3 is made of carbon steel; the end cover 3 is provided with a connecting hole 4 for connecting the exhaust pipe 1; the connecting hole edge 42 is a circular arc or a chamfer; the exhaust pipe 1 penetrates through the connecting hole 4; the welding part 2 is connected on the connecting hole edge 42 by resistance welding; the connecting hole edge 42 abuts the welding site 2.

The resistance welding structure of the exhaust pipe of the refrigeration compressor in the embodiment is only required to be installed in the following steps: 1) applying pressure to the welding part 2 of the exhaust pipe 1 to enable the welding part 2 to be tightly attached to the edge 42 of the connecting hole; 2) passing a large current between the welding part 2 and the contact surface of the edge 42 of the connecting hole, and utilizing the resistance of metal electrification to thermally melt the metal of the contact surface; 3) and the high-efficiency and reliable welding interface can be realized after the molten metal on the contact surface is solidified by keeping the pressure power off. The welding mode does not need brazing filler metal, saves cost, and has high welding reliability and difficult leakage.

In the use process of the resistance welding structure of the exhaust pipe of the refrigeration compressor in the embodiment, when the refrigerant 5 passes through the exhaust pipe 1, the fluid refrigerant 5 can generate axial tension on the exhaust pipe 1, and the tension is transmitted to the end cover 3 through the contact surface between the welding part 2 and the edge 42 of the connecting hole, so that the reliable performance of the welding part can be ensured, and the welding part is prevented from being detached due to overlarge external force.

In addition, it should be noted that the specific embodiments described in the present specification may be different in the components, the shapes of the components, the names of the components, and the like, and the above description is only an example of the structure of the present invention. All the equivalent changes or simple changes made according to the structure, characteristics and principle of the utility model are included in the protection scope of the utility model. Various modifications, additions and substitutions may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.

Claims

1. A resistance welding structure of a refrigeration compressor exhaust pipe comprises an exhaust pipe (1) and an end cover (3); the exhaust pipe is characterized in that a welding part (2) is arranged on the exhaust pipe (1); the end cover (3) is provided with a connecting hole (4) for connecting the exhaust pipe (1); the exhaust pipe (1) penetrates through the connecting hole (4); the welding part (2) is connected to the connecting hole (4) through resistance welding; the exhaust pipe (1) is of an integrally formed structure; the welding part (2) is an expansion structure formed by the protrusion of the outer wall of the exhaust pipe (1); the welding part (2) is positioned at the lower part of the exhaust pipe (1).

2. An electric resistance welding structure of a discharge pipe of a refrigerating compressor according to claim 1, wherein a diameter of the welding portion (2) of the discharge pipe is larger than a diameter of the connection hole (4).

3. An electric resistance welding structure of a discharge pipe of a refrigerating compressor according to claim 1, characterized in that the material of the end cover (3) is carbon steel; the exhaust pipe (1) is made of copper or copper alloy or copper-plated steel pipe.

4. An electric resistance welding structure of a refrigerant compressor discharge pipe according to claim 1, wherein the edge of the connection hole (4) is turned up to form a burring (41); the welding part (2) is positioned at the lower end of the flanging (41); the welding part (2) is in contact with the lower end of the flanging (41) through resistance welding to realize resistance welding connection.

5. An electric resistance welding structure of a refrigerant compressor discharge pipe according to claim 4, wherein the lower plane of the flange (41) forms an included angle α with the lower plane of the end cover (3), and the degree of the included angle α is 0-60 degrees.

6. The structure of electric resistance welding of discharge pipes of refrigeration compressors according to claim 4, characterized in that the shape of the welding portion (2) matches the shape of the flanging (41); the welding part (2) is positioned at the bottom of the flanging (41).

7. The electric resistance welding structure of a refrigerant compressor discharge pipe according to claim 1, wherein a connection hole edge (42) of the connection hole (4) is formed in a circular arc or a chamfer; the welding part (2) is connected with the edge (42) of the connecting hole through resistance welding.