Quick-plug type copper-aluminum connector

Abstract

The invention relates to a quick-insertion type copper-aluminum connector which comprises a connecting sleeve, a copper pipe and an aluminum pipe are inserted into the connecting sleeve from the two axial ends of the connecting sleeve respectively, and the copper pipe and the aluminum pipe are locked with the connecting sleeve through locking assemblies. The locking assembly comprises a locking plate, a sealing rubber strip and a fixing lantern ring, a locking groove allowing the locking plate to move is formed in the peripheral side wall of the connecting sleeve, the locking groove penetrates through the two sides of the thickness direction of the connecting sleeve, the locking plate moves in the diameter direction of the connecting sleeve, and the sealing rubber strip is fixedly connected to the face, close to the connecting sleeve, of the locking plate; the face, away from the locking plate, of the sealing rubber strip is located in the locking groove, the connecting sleeve is sleeved with the fixing lantern ring, the fixing lantern ring rotates in the circumferential direction of the connecting sleeve, and the fixing lantern ring drives the locking plate to move in the direction close to the central axis of the connecting sleeve through the driving assembly till the fixing lantern ring abuts against the corresponding copper pipe or aluminum pipe. The method has the effect of improving the connection coaxiality, the connection strength and the connection stability of the copper pipe and the aluminum pipe.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of refrigeration pipeline, in particular to a quick plug-in copper-aluminum joint. BACKGROUND

[0002] Copper pipe has good ductility, and is resistant to oxidation and compression, and is not easy to be corroded, so copper pipe is generally used as a connecting pipe in a refrigeration system, but the cost of copper pipe is relatively high, in order to reduce the cost, aluminum pipe can be connected on part of the pipeline, in the refrigeration pipeline system, copper pipe and aluminum pipe are usually connected as a whole by welding, however, the coaxiality of copper-aluminum pipe connected by welding is low, and the connection strength and stability are poor, especially in the case of radial external force, the connection of copper-aluminum pipe is easy to break. SUMMARY

[0003] In order to solve the above technical problems, the present application provides a quick plug-in copper-aluminum joint.

[0004] The quick plug-in copper-aluminum joint provided by the present application adopts the following technical scheme: A quick plug-in copper-aluminum joint, comprising a connecting sleeve, a copper pipe and an aluminum pipe are respectively inserted into the connecting sleeve from the two ends of the connecting sleeve in the axial direction, the copper pipe and the aluminum pipe are locked with the connecting sleeve by a locking assembly, and the locking assembly locks the corresponding copper pipe and aluminum pipe from the radial direction of the connecting sleeve.

[0005] By adopting the above technical scheme, the copper pipe and the aluminum pipe are respectively inserted into the connecting sleeve from the two ends of the connecting sleeve, and then the copper pipe and the connecting sleeve are locked by the locking assembly, and the aluminum pipe and the connecting sleeve are locked, realizing the quick connection of the copper-aluminum pipe, and under the guidance and protection of the connecting sleeve, the coaxiality of the copper-aluminum pipe is high, the connection strength and stability of the copper-aluminum pipe are improved, and the connection of the copper-aluminum pipe is not easy to break, and the copper pipe and the aluminum pipe can be reused after being separated, avoiding waste.

[0006] Preferably, the locking assembly comprises a locking plate, a sealing rubber strip and a fixed sleeve ring, a locking groove for the locking plate to move is formed on the peripheral side wall of the connecting sleeve, the locking groove penetrates through both sides of the thickness direction of the connecting sleeve, the locking plate moves along the diameter direction of the connecting sleeve, the sealing rubber strip is fixedly connected to one side of the locking plate close to the connecting sleeve, the other side of the sealing rubber strip away from the locking plate is located in the locking groove, the fixed sleeve ring is sleeved outside the connecting sleeve, the fixed sleeve ring rotates along the peripheral direction of the connecting sleeve, and the fixed sleeve ring drives the locking plate to move towards the direction close to the central axis of the connecting sleeve through the driving assembly until abutting against the corresponding copper pipe or aluminum pipe.

[0007] Preferably, the two ends of the locking plate are fixedly connected with guide blocks, guide grooves for the guide blocks to slide are formed on the inner walls of the two ends of the locking groove, and elastic pads are arranged in the guide grooves, the elastic pads naturally move the guide blocks in a direction away from the central axis of the connecting sleeve, and at this time, the side of the sealing rubber strip away from the locking plate is located in the locking groove.

[0008] Preferably, the driving assembly comprises a wedge-shaped plate and a trigger plate, the outer arc surface of the locking plate is located in the locking groove, the wedge-shaped plate is fixedly connected to the outer arc surface of the locking plate, the outer arc surface of the wedge-shaped plate is inclined in a clockwise direction towards a direction away from the locking plate, the trigger plate is fixedly connected to the inner circumferential surface of the fixed sleeve ring, the thickness of the trigger plate is uniform, the trigger plate is located on the side of the wedge-shaped plate in a counterclockwise direction, and when the fixed sleeve ring rotates clockwise, the trigger plate abuts against the wedge-shaped plate and pushes the wedge-shaped plate in a direction close to the central axis of the connecting sleeve, so that the sealing rubber strip abuts against the outer circumferential wall of the corresponding copper pipe or aluminum pipe.

[0009] By adopting the above technical scheme, when the copper pipe or aluminum pipe is locked, the fixed sleeve ring is rotated clockwise, the trigger block abuts against the wedge-shaped plate and pushes the wedge-shaped plate in a direction close to the central axis of the connecting sleeve, so that the sealing rubber strip abuts against the outer circumferential wall of the corresponding copper pipe or aluminum pipe, the corresponding copper pipe or aluminum pipe is locked under the friction of the sealing rubber strip, the fixed sleeve ring is difficult to rotate under the radial extrusion of the elastic pad, the copper pipe, the aluminum pipe and the connecting sleeve are tightly and stably connected, the operation is convenient, and the rapid connection of the copper pipe and the aluminum pipe is realized.

[0010] Preferably, three locking plates of each locking assembly are equidistantly arranged along the axial direction of the connecting sleeve, and each locking plate corresponds to a group of driving assemblies.

[0011] By adopting the above technical scheme, the uniformity of the stress between the connecting sleeve and the copper pipe and between the connecting sleeve and the aluminum pipe is improved, and the coaxiality and the connection strength of the copper pipe and the aluminum pipe are further ensured.

[0012] Preferably, an annular partition plate is arranged at the middle of the connecting sleeve in the axial direction, the outer circumferential wall of the annular partition plate is fixedly connected with the inner circumferential wall of the connecting sleeve, sealing ring grooves are formed on the two sides of the thickness direction of the annular partition plate, and sealing rings are arranged in the sealing ring grooves, and the side of the copper pipe and the aluminum pipe close to each other abuts against the side of the two sealing rings away from each other.

[0013] By adopting the above technical scheme, the arrangement of the annular partition plate and the sealing ring not only avoids the direct contact between the copper pipe and the aluminum pipe to reduce the wear of the two pipes, but also improves the sealing property between the copper pipe, the aluminum pipe and the connecting sleeve.

[0014] Preferably, the annular partition thickness direction is correspondingly provided with a pair of locking assemblies on both sides, wherein one set of locking assemblies corresponds to the copper pipe, and the other set of locking assemblies corresponds to the copper pipe, and the two fixing collars are fixedly connected through the connecting collar.

[0015] By adopting the above technical scheme, the two fixing collars can be synchronously rotated through the connecting collar, and the operation convenience is improved.

[0016] Preferably, the inner wall of the connecting collar is fixedly connected with an elastic block, the outer peripheral wall of the connecting sleeve is provided with a gap ring groove for sliding of the elastic block, and the inner arc surface of the gap ring groove is provided with a positioning groove for penetration of the elastic block.

[0017] By adopting the above technical scheme, the connecting collar and the fixing collar are further locked through penetration of the elastic block into the positioning groove, the locking stability is improved, and the connection tightness and the connection stability between the copper pipe, the aluminum pipe and the connecting sleeve are improved.

[0018] Preferably, the connecting sleeve is coaxially connected with an expanded pipe at both ends, the expanded pipe comprises an inclined section and a straight section, the inclined section is inclined from the middle part of the connecting sleeve to both ends in a direction away from the central axis of the connecting sleeve, and the straight section is integrally formed at one end of the inclined section away from the connecting sleeve.

[0019] By adopting the above technical scheme, the expanded pipe improves the smoothness of the copper pipe and the aluminum pipe inserted into the connecting sleeve.

[0020] Preferably, the connecting sleeve is made of stainless steel.

[0021] By adopting the above technical scheme, the corrosion resistance and the durability of the connecting sleeve are improved.

[0022] In summary, the present application has at least one of the following beneficial technical effects: 1. The copper pipe and the aluminum pipe are respectively inserted into the connecting sleeve from both ends of the connecting sleeve, and then the copper pipe and the connecting sleeve are locked by the locking assembly, and the aluminum pipe and the connecting sleeve are locked, so as to realize rapid connection of the copper pipe and the aluminum pipe, and under the guidance and protection of the connecting sleeve, the coaxiality of the copper pipe and the aluminum pipe is high, the connection strength and the connection stability of the copper pipe and the aluminum pipe are improved, the connection of the copper pipe and the aluminum pipe is not easy to break, and the copper pipe and the aluminum pipe can be reused after being separated, thereby avoiding waste. 2. The structure of the locking assembly improves the force uniformity between the connecting sleeve and the copper pipe, and between the connecting sleeve and the aluminum pipe, and further ensures the coaxiality and the connection strength of the copper pipe and the aluminum pipe. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1is a schematic diagram of the overall structure of a quick insertion type copper-aluminum joint in the embodiment of the present application.

[0024] Figure 2 is a schematic diagram of the cross-sectional structure when the quick insertion type copper-aluminum joint is connected with copper pipes and aluminum pipes in the embodiment of the present application.

[0025] Figure 3 is a schematic diagram of the cross-sectional structure of a locking assembly in the embodiment of the present application.

[0026] Figure 4 is a schematic diagram of the cross-sectional structure of an elastic block and a positioning groove in the embodiment of the present application.

[0027] Legend: 1, copper pipe; 2, aluminum pipe; 3, connecting sleeve; 31, annular partition; 311, sealing ring groove; 312, sealing ring; 32, locking groove; 321, guide groove; 322, elastic pad; 33, make-way ring groove; 331, positioning groove; 4, locking assembly; 41, locking plate; 411, guide block; 42, sealing rubber strip; 43, fixing sleeve ring; 5, driving assembly; 51, wedge-shaped plate; 52, trigger plate; 6, connecting sleeve ring; 61, elastic block; 7, outwardly expanding pipe; 71, inclined section; 72, straight section. DETAILED DESCRIPTION

[0028] The following will be described in detail with reference to the accompanying Figures 1-4 The present application will be described in further detail.

[0029] The embodiment of the present application discloses a quick insertion type copper-aluminum joint.

[0030] Reference will be made to Figures 1-4 The quick insertion type copper-aluminum joint comprises a connecting sleeve 3, a copper pipe 1 and an aluminum pipe 2 are respectively inserted into the connecting sleeve 3 from the two ends of the connecting sleeve 3 in the axial direction, the copper pipe 1 and the aluminum pipe 2 are locked with the connecting sleeve 3 through a locking assembly 4, and the locking assembly 4 locks the corresponding copper pipe 1 and aluminum pipe 2 from the radial direction of the connecting sleeve 3. The copper pipe 1 and the aluminum pipe 2 are respectively inserted into the connecting sleeve 3 from the two ends of the connecting sleeve 3, and then the copper pipe 1 and the connecting sleeve 3 are locked and the aluminum pipe 2 and the connecting sleeve 3 are locked through the locking assembly 4, so as to realize the quick connection of the copper-aluminum pipe 2. Under the guidance and protection of the connecting sleeve 3, the coaxiality of the copper-aluminum pipe 2 is high, the connection strength and stability of the copper-aluminum pipe 2 are improved, the connection of the copper-aluminum pipe 2 is not easy to break, the copper pipe 1 and the aluminum pipe 2 can be reused after being separated, and waste is avoided.

[0031] The locking assembly 4 comprises a locking plate 41, a sealing rubber strip 42 and a fixing collar 43. A locking groove 32 is formed on the peripheral wall of the connecting sleeve 3 for the locking plate 41 to move in. The locking groove 32 penetrates through the connecting sleeve 3 in the thickness direction. The locking plate 41 moves along the diameter direction of the connecting sleeve 3. The sealing rubber strip 42 is fixedly connected to one side of the locking plate 41 close to the connecting sleeve 3. The other side of the sealing rubber strip 42 away from the locking plate 41 is located in the locking groove 32. The fixing collar 43 is sleeved on the outside of the connecting sleeve 3. The fixing collar 43 rotates along the peripheral direction of the connecting sleeve 3. The fixing collar 43 drives the locking plate 41 to move towards the direction close to the central axis of the connecting sleeve 3 through the driving assembly 5 until abutting against the corresponding copper pipe 1 or aluminum pipe 2. The sealing rubber strip 42 is made of rubber.

[0032] The three locking plates 41 of each set of locking assembly 4 are equidistantly arranged along the axial direction of the connecting sleeve 3. Each locking plate 41 corresponds to a set of driving assembly 5. Through the arrangement of the three locking plates 41, the uniformity of the stress between the connecting sleeve 3 and the copper pipe 1 and between the connecting sleeve 3 and the aluminum pipe 2 is improved. Meanwhile, the coaxiality and the connecting strength of the copper pipe 1 and the aluminum pipe 2 are further ensured.

[0033] The two ends of the locking plate 41 are fixedly connected with guide blocks 411. The inner walls of the two ends of the locking groove 32 are provided with guide grooves 321 for the guide blocks 411 to slide. The guide grooves 321 are provided with elastic pads 322. The elastic pads 322 are made of rubber. In the natural state, the elastic pads 322 make the guide blocks 411 move towards the direction away from the central axis of the connecting sleeve 3. At this time, the other side of the sealing rubber strip 42 away from the locking plate 41 is located in the locking groove 32.

[0034] The driving assembly 5 comprises a wedge-shaped plate 51 and a trigger plate 52. The outer arc surface of the locking plate 41 is located in the locking groove. The wedge-shaped plate 51 is fixedly connected to the outer arc surface of the locking plate 41. The outer arc surface of the wedge-shaped plate 51 is inclined towards the direction away from the locking plate 41 in the clockwise direction. The trigger plate 52 is fixedly connected to the inner peripheral surface of the fixing collar 43. The thickness of the trigger plate 52 is uniform. The trigger plate 52 is located on the side opposite to the wedge-shaped plate 51 in the counterclockwise direction. When the fixing collar 43 rotates clockwise, the trigger plate 52 abuts against the wedge-shaped plate 51 and pushes the wedge-shaped plate 51 towards the direction close to the central axis of the connecting sleeve 3, so that the sealing rubber strip 42 abuts against the peripheral wall of the corresponding copper pipe 1 or aluminum pipe 2.

[0035] When the copper pipe 1 or the aluminum pipe 2 is locked, the fixed sleeve ring 43 is rotated clockwise, the trigger block abuts against the wedge-shaped plate 51 and pushes the wedge-shaped plate 51 towards the direction close to the axis of the connecting sleeve 3, the sealing rubber strip 42 abuts against the outer peripheral wall of the corresponding copper pipe 1 or aluminum pipe 2, the copper pipe 1 or the aluminum pipe 2 is locked under the friction of the sealing rubber strip 42 and the copper pipe 1 or the aluminum pipe 2, the fixed sleeve ring 43 is difficult to rotate under the radial extrusion of the elastic pad 322, the copper pipe 1, the aluminum pipe 2 and the connecting sleeve 3 are tightly and stably connected, the operation is convenient, the copper pipe 1 and the aluminum pipe 2 are quickly connected.

[0036] The middle part of the connecting sleeve 3 in the axial direction is provided with an annular partition plate 31, the outer peripheral wall of the annular partition plate 31 is fixedly connected with the inner peripheral wall of the connecting sleeve 3, the two sides of the annular partition plate 31 in the thickness direction are provided with sealing ring grooves 311, sealing rings 312 are installed in the sealing ring grooves 311, and the copper pipe 1 and the aluminum pipe 2 abut against the sides away from each other of the two sealing rings 312. The arrangement of the annular partition plate 31 and the sealing ring 312 not only avoids the direct contact between the copper pipe 1 and the aluminum pipe 2 to reduce the wear of the two pipes, but also improves the sealing between the copper pipe 1, the aluminum pipe 2 and the connecting sleeve 3.

[0037] The two sides of the annular partition plate 31 in the thickness direction correspond to a group of locking assemblies 4 respectively, one group of locking assemblies 4 correspond to the copper pipe 1, the other group of locking assemblies 4 correspond to the copper pipe 1, and the two fixed sleeve rings 43 are fixedly connected through the connecting sleeve ring 6. The two fixed sleeve rings 43 can be synchronously rotated through the connecting sleeve ring 6, and the operation convenience is improved.

[0038] The inner wall of the connecting sleeve ring 6 is fixedly connected with an elastic block 61, the elastic block 61 is made of rubber, the outer peripheral wall of the connecting sleeve 3 is provided with a give-way ring groove 33 for sliding of the elastic block 61, the inner arc surface of the give-way ring groove 33 is provided with a positioning groove 331 for penetration of the elastic block 61, and the elastic block 61 penetrates into the positioning groove 331 when the trigger plate 52 and the wedge-shaped plate 51 push the sealing rubber strip 42 to abut against the outer peripheral wall of the corresponding copper pipe 1 or aluminum pipe 2. The elastic block 61 penetrates into the positioning groove 331 to further lock the connecting sleeve ring 6 and the fixed sleeve ring 43, the locking stability is improved, and the connection tightness and stability between the copper pipe 1, the aluminum pipe 2 and the connecting sleeve 3 are improved.

[0039] The two ends of the connecting sleeve 3 are coaxially connected with outwardly expanded pipes 7, the outwardly expanded pipes 7 include inclined sections 71 and straight sections 72, the inclined sections 71 are inclined from the middle part to the two ends of the connecting sleeve 3 towards the direction away from the axis of the connecting sleeve 3, and the straight sections 72 are integrally formed at the ends away from the connecting sleeve 3 of the inclined sections 71, thereby improving the smoothness of the copper pipe 1 and the aluminum pipe 2 inserted into the connecting sleeve 3.

[0040] The connecting sleeve 3 is made of stainless steel, thereby improving the corrosion resistance and durability of the connecting sleeve 3.

[0041] The implementation principle of the embodiment of the quick insertion type copper-aluminum joint is as follows: When the copper pipe 1 or the aluminum pipe 2 is locked, the fixed sleeve ring 43 is rotated clockwise, the trigger block abuts against the wedge-shaped plate 51 and pushes the wedge-shaped plate 51 towards the direction close to the axis of the connecting sleeve pipe 3, the sealing rubber strip 42 abuts against the outer peripheral wall of the corresponding copper pipe 1 or aluminum pipe 2, the corresponding copper pipe 1 or aluminum pipe 2 is locked under the friction of the sealing rubber strip 42 and the copper pipe 1 or aluminum pipe 2, the fixed sleeve ring 43 is difficult to rotate under the radial extrusion of the elastic pad 322, the copper pipe 1, the aluminum pipe 2 and the connecting sleeve pipe 3 are tightly and stably connected, the operation is convenient, and the quick connection of the copper pipe 1 and the aluminum pipe 2 is realized.

[0042] The above are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, so that: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A quick-plug copper-aluminum joint, characterized by: The application relates to a copper-aluminum pipe connecting device, which comprises a connecting sleeve (3), a copper pipe (1) and an aluminum pipe (2), the copper pipe (1) and the aluminum pipe (2) are respectively inserted into the connecting sleeve (3) from two axial ends of the connecting sleeve (3), and the copper pipe (1) and the aluminum pipe (2) are locked with the connecting sleeve (3) through a locking assembly (4).

2. The quick-plug Cu-Al joint of claim 1, wherein: The locking assembly (4) comprises a locking plate (41), a sealing rubber strip (42) and a fixing sleeve ring (43), a locking groove (32) for the locking plate (41) to move is formed on the peripheral wall of the connecting sleeve (3), the locking groove (32) penetrates through the two sides in the thickness direction of the connecting sleeve (3), the locking plate (41) moves along the diameter direction of the connecting sleeve (3), the sealing rubber strip (42) is fixedly connected to one side of the locking plate (41) close to the connecting sleeve (3), the other side of the sealing rubber strip (42) away from the locking plate (41) is located in the locking groove (32), the fixing sleeve ring (43) is sleeved outside the connecting sleeve (3), the fixing sleeve ring (43) rotates along the peripheral direction of the connecting sleeve (3), and the fixing sleeve ring (43) drives the locking plate (41) to move towards the direction close to the central axis of the connecting sleeve (3) through a driving assembly (5) until the locking plate (41) abuts against the corresponding copper pipe (1) or aluminum pipe (2).

3. The quick-plug Cu-Al joint of claim 2, wherein: The two ends of the locking plate (41) are fixedly connected with guide blocks (411), guide grooves (321) for the guide blocks (411) to slide are formed on the inner walls of the two ends of the locking groove (32), and elastic pads (322) are arranged in the guide grooves (321), the elastic pads (322) make the guide blocks (411) move towards the direction away from the central axis of the connecting sleeve (3) in the natural state, and at this time, the other side of the sealing rubber strip (42) away from the locking plate (41) is located in the locking groove (32).

4. The quick-plug Cu-Al joint of claim 3, wherein: The driving assembly (5) comprises a wedge-shaped plate (51) and a trigger plate (52), the outer arc surface of the locking plate (41) is located in the locking groove, the wedge-shaped plate (51) is fixedly connected to the outer arc surface of the locking plate (41), the outer arc surface of the wedge-shaped plate (51) is inclined towards the direction away from the locking plate (41) in the clockwise direction, the trigger plate (52) is fixedly connected to the inner peripheral surface of the fixing sleeve ring (43), the trigger plate (52) has uniform thickness, the trigger plate (52) is located on the side opposite to the wedge-shaped plate (51) in the counterclockwise direction, and when the fixing sleeve ring (43) rotates clockwise, the trigger plate (52) abuts against the wedge-shaped plate (51) and pushes the wedge-shaped plate (51) towards the direction close to the central axis of the connecting sleeve (3), so that the sealing rubber strip (42) abuts against the peripheral wall of the corresponding copper pipe (1) or aluminum pipe (2).

5. The quick-plug Cu-Al joint of claim 2, wherein: The locking plates (41) of each set of the locking assembly (4) are arranged equidistantly in the axial direction of the connecting sleeve (3), and each locking plate (41) corresponds to a set of driving assemblies (5).

6. The quick-plug Cu-Al joint of claim 4, wherein: The middle part of the connecting sleeve (3) is provided with an annular partition plate (31), the outer peripheral wall of the annular partition plate (31) is fixedly connected with the inner peripheral wall of the connecting sleeve (3), the two sides of the annular partition plate (31) in the thickness direction are provided with sealing ring grooves (311), the sealing ring grooves (311) are provided with sealing rings (312), and the copper pipe (1) and the aluminum pipe (2) are abutted against the two sides of the two sealing rings (312) away from each other.

7. The quick-plug copper-aluminum joint of claim 6, wherein: The two sides of the annular partition plate (31) in the thickness direction are respectively provided with a group of locking assemblies (4), one group of locking assemblies (4) correspond to the copper pipe (1), the other group of locking assemblies (4) correspond to the copper pipe (1), and the two fixing sleeves (43) are fixedly connected through the connecting sleeve (6).

8. The quick-plug Cu-Al joint of claim 7, wherein: The inner wall of the connecting sleeve (6) is fixedly connected with an elastic block (61), the outer peripheral wall of the connecting sleeve (3) is provided with a gap ring groove (33) for sliding of the elastic block (61), the inner arc surface of the gap ring groove (33) is provided with a positioning groove (331) for penetration of the elastic block (61), and when the trigger plate (52) and the wedge-shaped plate (51) are pushed to abut against the outer peripheral wall of the corresponding copper pipe (1) or aluminum pipe (2) of the sealing rubber strip (42), the elastic block (61) penetrates into the positioning groove (331).

9. The quick-plug copper-aluminum joint of claim 1, wherein: The two ends of the connecting sleeve (3) are coaxially connected with outwardly expanded pipes (7), the outwardly expanded pipes (7) comprise inclined sections (71) and straight sections (72), the inclined sections (71) are inclined from the middle part of the connecting sleeve (3) to the two ends in the direction away from the central axis of the connecting sleeve (3), and the straight sections (72) are integrally formed at the ends of the inclined sections (71) away from the connecting sleeve (3).

10. The quick-plug copper-aluminum joint of claim 1, wherein: The connecting sleeve (3) is made of stainless steel.

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