Resistance welding device and method for welding the outlet end of stator winding

Abstract

The invention discloses a resistance welding device and a method for welding the outlet end of a stator winding. The resistance welding device comprises an upper electrode and a lower electrode. The upper electrode can extend into an electrode accommodating space between a first radial crimping piece of a stator and an end of a stator core. The upper electrode and the lower electrode can move axially relative to each other to pressure weld the outlet end of the stator winding, the first radial crimping piece and the second radial crimping piece. That is, the invention can use the resistance welding device to weld the connection terminal of the stator and the outlet end of the stator winding, and can automatically remove the redundant wire ends of the outlet end during welding, thereby having higher production efficiency and lower production cost.

Description

Technical Field

[0001] The invention relates to the technical field of stator processing, and in particular to a resistance welding device and a method for welding an outlet end of a stator winding. Background Art

[0002] In existing air conditioner plastic sealed motors, several connection terminals are usually inserted on the stator core, and the output end of the stator winding and the power line board can be welded to the connection terminals, thereby realizing the electrical connection between the stator winding and the power line board.

[0003] Reference Figure 1 Before welding the stator winding outlet terminal and the wiring terminal, the outlet terminal needs to be wound around the wiring terminal. It can be seen that the wire ends of the outlet terminal wound around the wiring terminal are pulled out of the stator. At this time, the outlet terminal and the wiring terminal can be welded together by soldering, and the wire ends pulled out of the stator can be cut off, thereby completing the processing and connection of the wiring terminal, the power line board and the stator winding outlet terminal.

[0004] However, for the above processing, soldering requires manual operation, which makes it difficult to ensure stable production speed and welding quality. In addition, the wire ends at the outlet need to be cut manually, which slows down the production speed to a certain extent and is prone to the risk of cutting the wrong wire. If automated equipment is to be introduced, a large amount of capital investment is required, which greatly increases the production cost of the motor. Summary of the invention

[0005] In view of the above-mentioned defects or shortcomings of the prior art, the present invention provides a resistance welding device and a method for welding the output ends of the stator winding, which can weld the stator terminal and the output ends of the stator winding by resistance welding, and can automatically remove excess wire ends at the output ends during welding, which is beneficial to improving the production efficiency of the motor and reducing the production cost of the motor.

[0006] To achieve the above-mentioned purpose, the present invention provides a resistance welding device, which is used to weld the output terminal of a stator. The stator also includes a stator core and a stator winding arranged on the stator core. A terminal extends from the end of the stator core. The terminal includes a first radial crimping sheet and a second radial crimping sheet arranged at intervals along the axial direction. The output terminal of the stator winding passes through between the first radial crimping sheet and the second radial crimping sheet and is pre-clamped between the first radial crimping sheet and the second radial crimping sheet. An electrode accommodating space is formed between the first radial crimping sheet and the end of the stator core; the resistance welding device includes an upper electrode and a lower electrode, the upper electrode can extend into the electrode accommodating space, and the upper electrode and the lower electrode can move axially relative to each other to pressure weld the output terminal, the first radial crimping sheet and the second radial crimping sheet.

[0007] Preferably, at least one of the bottom end surface of the upper electrode and the top end surface of the lower electrode is formed with a crimping sheet accommodating groove for accommodating the first radial crimping sheet and the second radial crimping sheet, and the lead end passes through the side wall of the crimping sheet accommodating groove;

[0008] Wherein, when the upper electrode and the lower electrode are able to axially move relative to each other to pressure weld the first radial pressure-welding piece and the second radial pressure-welding piece, the outlet wire end penetrating from the side wall of the pressure groove is pressed off.

[0009] Preferably, the upper electrode is arranged radially, the lower electrode is arranged axially and the crimping sheet accommodating groove is formed on the top surface, and the lead end extends from the top surface of the radially outer side wall of the crimping groove.

[0010] Preferably, the resistance welding device also includes a first lifting frame and a second lifting frame that can move axially relative to each other, an upper electrode base arranged at the top of the first lifting frame, and a lower electrode base arranged at the top of the second lifting frame, the upper electrode is detachably inserted in the upper electrode base along the radial direction, and the lower electrode is detachably inserted in the lower electrode base along the axial direction.

[0011] Preferably, the crimping sheet accommodating groove is formed on the top end surface and the bottom end surface of the lower electrode.

[0012] Preferably, the wiring terminal further comprises an axial support, and the outlet end is wound around the axial support, wherein the outlet end that is crushed off remains connected to the axial support.

[0013] In addition, the present invention also provides a method for welding an outlet end of a stator winding, comprising:

[0014] Providing the above-mentioned stator and the above-mentioned resistance welding device;

[0015] Lifting the resistance welding device along the axial direction;

[0016] The resistance welding device presses and welds the plurality of connection terminals and the plurality of outlet terminals in sequence along the circumferential direction.

[0017] Through the above technical scheme, the stator winding outlet end in the stator of the present invention can pass through between the first radial crimping piece and the second radial crimping piece of the terminal, and an electrode accommodating space is formed between the first radial crimping piece and the end of the stator core. Based on the structure of the terminal, the stator of the present invention can adopt a resistance welding device dedicated to welding the outlet end, the first radial crimping piece and the second radial crimping piece of the stator winding, the upper electrode of the resistance welding device can be accommodated in the electrode accommodating space, and the upper electrode and the lower electrode are used to clamp the outlet end, the first radial crimping piece and the second radial crimping piece and weld. During the welding process, the excess wire ends of the outlet end are melted, thereby achieving the effect of automatically removing the wire ends. It can be seen that the stator of the present invention has higher production efficiency and lower production cost.

[0018] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0020] Figure 1 It is a structural schematic diagram of the stator of a plastic-encapsulated motor in the prior art (the excess wire ends need to be manually cut off after the wire ends are wound around the wiring terminals);

[0021] Figure 2 It is a structural schematic diagram of a stator in a specific embodiment of the present invention;

[0022] Figure 3 It is a structural schematic diagram of a resistance welding device and a stator in a specific embodiment of the present invention when they are in a position to be welded;

[0023] Figure 4 It is a structural schematic diagram of a resistance welding device and a stator when being welded in a specific embodiment of the present invention;

[0024] Figure 5 for Figure 4 A partial enlarged schematic diagram of the resistance welding device and the stator being welded;

[0025] Figure 6It is a schematic structural diagram of another resistance welding device and a stator when being welded in a specific embodiment of the present invention (the crimping sheet receiving groove is arranged in the upper electrode).

[0026] Description of reference numerals:

[0027] 1 Stator 2 Resistance welding device

[0028] 11 stator core 12 stator winding

[0029] 13 Terminal block 21 Upper electrode

[0030] 22 Lower electrode 23 Upper electrode base

[0031] 24 Lower electrode base 25 First lifting frame

[0032] 26 Second lifting frame 27 Sliding block

[0033] 28 Pressing piece receiving groove 29 Pressing groove side wall

[0034] 121 Outlet terminal 131 First radial crimping piece

[0035] 132 second radial crimping piece 133 axial support DETAILED DESCRIPTION

[0036] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0037] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0038] In the present invention, unless otherwise specified, directional words such as "up, down, top, bottom" are usually used with reference to the directions shown in the drawings or are used to describe the relative positional relationships of components in the vertical, perpendicular or gravity direction.

[0039] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0040] The present invention provides a stator 1, such as Figures 2 to 6As shown, the stator 1 includes a stator core 11 and a stator winding 12 arranged on the stator core 11, and a terminal 13 extends from the end of the stator core 11. The terminal 13 includes a first radial pressing piece 131 and a second radial pressing piece 132 arranged at intervals along the axial direction, and the first radial pressing piece 131 and the second radial pressing piece 132 can be formed into a structure that can be clamped to each other. Before welding the outlet terminal 121 and the terminal 13, the outlet terminal 121 can pass between the first radial pressing piece 131 and the second radial pressing piece 132, and an electrode accommodating space is formed between the first radial pressing piece 131 and the end of the stator core 11.

[0041] Based on the structure of the above-mentioned terminal 13, the present invention provides a resistance welding device 2, such as Figures 3 to 6 As shown, the resistance welding device 2 includes an upper electrode 21 and a lower electrode 22, and the upper electrode 21 can extend into the electrode accommodating space formed between the first radial crimping sheet 131 and the end of the stator core 11, and the upper electrode 21 and the lower electrode 22 can move axially relative to each other to pressure weld the wire end 121, the first radial crimping sheet 131 and the second radial crimping sheet 132.

[0042] By setting the above-mentioned terminal 13 in the stator 1 and setting the resistance welding device 2 based on the structure of the terminal 13, the outlet terminal 121 can be clamped between the first radial crimping piece 131 and the second radial crimping piece 132 to achieve rapid welding. Before welding, the upper electrode 21 is first axially lifted to the electrode accommodating space, at which time the first radial crimping piece 131 and the second radial crimping piece 132 are both located below the upper electrode 21, and the outlet terminal 121 is passed through between the first radial crimping piece 131 and the second radial crimping piece 132. Next, the lower electrode 22 is axially lifted so that the first radial crimping piece 131 and the second radial crimping piece 132 press the outlet terminal 121. After the outlet terminal 121, the first radial crimping piece 131 and the second radial crimping piece 132 are all compressed, the upper electrode 21 and the lower electrode 22 are immediately discharged. At this time, the instantaneous high heat generated by the upper electrode 21 and the lower electrode 22 can fuse the outlet terminal 121, the first radial crimping piece 131 and the second radial crimping piece 132 into one, thereby realizing the electrical connection between the terminal 13 and the outlet terminal 121. Finally, after the operation is completed, the upper electrode 21 and the lower electrode 22 are reset, and wait for another terminal 13 of the same stator 1 to rotate circumferentially to the welding position before restarting the work.

[0043] It should be noted that before welding, the outlet terminal 121 can be pre-clamped between the first radial crimping piece 131 and the second radial crimping piece 132. The purpose of the pre-clamping process is to prevent the outlet terminal 121 from slipping out of the crimping piece due to shaking during the process of the stator 1 moving to the welding position, which can reduce the error rate in the welding process, thereby ensuring the production efficiency and product quality of the stator 1. In addition, when the upper and lower electrodes are clamped, direct contact between the two should be avoided, and a certain axial gap should be retained.

[0044] As can be seen from the above, since the first radial crimping piece 131 and the second radial crimping piece 132 for clamping the outlet terminal 121 are provided in the terminal 13, the terminal 13 and the outlet terminal 121 of the stator 1 of the present invention can be quickly welded by the resistance welding device 2, which greatly improves the production efficiency of the stator 1 and saves labor costs.

[0045] Preferably, if Figure 5 and Figure 6 As shown, a pressure-bonding sheet accommodating groove 28 for accommodating the first radial pressure-bonding sheet 131 and the second radial pressure-bonding sheet 132 can be formed on at least one of the bottom end surface of the upper electrode 21 and the top end surface of the lower electrode 22. In other words, the pressure-bonding sheet accommodating groove 28 can be formed on the bottom end surface of the upper electrode 21 or the top end surface of the lower electrode 22, or the pressure-bonding sheet accommodating groove 28 can be formed on the bottom end surface of the upper electrode 21 and the top end surface of the lower electrode 22 at the same time, and the groove depth of the pressure-bonding sheet accommodating groove 28 should be roughly equal to the overall thickness of the first radial pressure-bonding sheet 131 and the second radial pressure-bonding sheet 132 after clamping. At this time, the outlet terminal 121 can pass through the pressure groove side wall 29 of the pressure-bonding sheet accommodating groove 28. Based on this structure, when the upper electrode 21 and the lower electrode 22 are discharge-welded, the outlet terminal 121 passing through the pressure groove side wall 29 can be pressed off in a molten state, thereby automatically removing excess wire ends, saving the process of manually cutting wire ends, further improving production efficiency and saving labor costs.

[0046] Preferably, under the premise of ensuring strength, the groove side wall 29 can be set to a slender structure, which is more conducive to cutting off excess thread ends.

[0047] like Figures 3 to 6As shown, the upper electrode 21 can be placed radially, the lower electrode 22 can be placed axially and the top surface thereof is formed with the above-mentioned crimping sheet accommodating groove 28, at which time the outlet terminal 121 can extend from the top surface of the radially outer side wall 29 of the crimping groove. In addition, the resistance welding device 2 also includes a first lifting frame 25 and a second lifting frame 26 that can move axially relative to each other, the top of the first lifting frame 25 is fixedly mounted with an upper electrode base 23 and the top of the second lifting frame 26 is fixedly mounted with a lower electrode base 24, the first lifting frame 25 is fixedly connected with a slider 27, and a slidable connection is formed between the second lifting frame 26 and the slider 27. At this time, the upper electrode 21 is inserted into the upper electrode base 23 in the radial direction, and the lower electrode 22 is inserted into the lower electrode base 24 in the axial direction. In order to facilitate disassembly and replacement, the upper electrode 21 and the lower electrode 22 can be set as a detachable structure. Before welding, when the stator 1 enters the position to be welded, the first lifting frame 25 first drives the upper electrode 21 to axially lift, and then the second lifting frame 26 drives the lower electrode 22 to axially lift to compress the outlet terminal 121, the first radial crimping piece 131 and the second radial crimping piece. After welding is completed, the second lifting frame 26 drives the lower electrode 22 to descend, and then the first lifting frame 25 drives the upper electrode 21 to descend, thereby completing the reset and waiting for the next start.

[0048] Based on the detachable structure between the upper electrode 21 and the upper electrode base 23 and between the lower electrode 22 and the lower electrode base 24. Preferably, the upper electrode 21 can be set to a rectangular parallelepiped shape, in which case the upper electrode 21 includes an upper electrode insertion section inserted in the upper electrode base 23 and an upper electrode extension section extending out of the upper electrode base 23. Since both the upper electrode insertion section and the upper electrode extension section have 4 welding surfaces that can be used for welding, and since the upper electrode insertion section and the upper electrode extension section can replace each other, it is equivalent to that the upper electrode 21 has 8 available welding surfaces, that is, the service life is extended by 8 times. In addition, the top end surface and the bottom end surface of the lower electrode 22 can be formed with a pressure-bonding sheet accommodating groove 28, so that the top end surface and the bottom end surface of the lower electrode 22 can also replace each other, which is equivalent to the service life of the lower electrode 22 being extended by 1 times.

[0049] Preferably, the upper electrode base 23 and the lower electrode base 24 can be made of chromium-zirconium copper with good electrical and thermal conductivity, and the upper electrode 21 and the lower electrode 22 can be made of wear-resistant and high-temperature resistant tungsten steel YG8, thereby effectively improving the service life and welding effect of the resistance welding device.

[0050] In addition, the terminal 13 may further include an axial support 133, and the first radial crimping piece 131 may radially extend from the axial support 133. More preferably, the stator 1 may further include an insulating frame wrapped on the outer surface of the stator core 11, and the axial support 133 may extend from the insulating frame. The purpose of providing the axial support 133 is that before welding, the outlet terminal 121 passing through between the first radial crimping piece 131 and the second radial crimping piece 132 may be wound around the axial support 133. In this way, during welding, the excess wire ends of the outlet terminal 121 can be melted off and remain connected to the axial support 133 without falling off, thereby effectively avoiding adhesion to the electrode and affecting the normal operation of the electrode.

[0051] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0052] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0053] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A resistance welding device, characterized in that: The resistance welding device (2) is used for welding an outlet terminal (121) of a stator (1); the stator (1) further comprises a stator core (11) and a stator winding (12) arranged on the stator core (11); a terminal (13) extends from an end of the stator core (11); the terminal (13) comprises a first radial crimping piece (131) and a second radial crimping piece (132) arranged at intervals along the axial direction; the outlet terminal (121) of the stator winding (12) passes through between the first radial crimping piece (131) and the second radial crimping piece (132) and is pre-clamped. An electrode accommodating space is formed between the first radial crimping piece (131) and the second radial crimping piece (132), and between the first radial crimping piece (131) and the end of the stator core (11); the resistance welding device (2) comprises an upper electrode (21) and a lower electrode (22), the upper electrode (21) being able to extend into the electrode accommodating space, and the upper electrode (21) and the lower electrode (22) being able to move axially relative to each other to pressure weld the outlet terminal (121), the first radial crimping piece (131) and the second radial crimping piece (132).

2. The resistance welding device according to claim 1, characterized in that: A crimping piece receiving groove (28) for receiving the first radial crimping piece (131) and the second radial crimping piece (132) is formed on at least one of the bottom end surface of the upper electrode (21) and the top end surface of the lower electrode (22), and the outlet terminal (121) passes through a crimping groove side wall (29) of the crimping piece receiving groove (28); When the upper electrode (21) and the lower electrode (22) are able to move axially relative to each other to pressure weld the first radial pressure-welding piece (131) and the second radial pressure-welding piece (132), the outlet end (121) passing through the side wall (29) of the pressure groove is pressed off.

3. The resistance welding device according to claim 2, characterized in that: The upper electrode (21) is arranged radially, the lower electrode (22) is arranged axially and has the crimping sheet accommodating groove (28) formed on its top end surface, and the lead end (121) extends from the top end surface of the crimping groove side wall (29) on the radial outside.

4. The resistance welding device according to claim 3, characterized in that: The resistance welding device (2) further comprises a first lifting frame (25) and a second lifting frame (26) which are capable of axially moving relative to each other, an upper electrode base (23) arranged at the top end of the first lifting frame (25), and a lower electrode base (24) arranged at the top end of the second lifting frame (26), wherein the upper electrode (21) is detachably inserted into the upper electrode base (23) in the radial direction, and the lower electrode (22) is detachably inserted into the lower electrode base (24) in the axial direction.

5. The resistance welding device according to claim 2, characterized in that: The top end surface and the bottom end surface of the lower electrode (22) are both formed with the crimping piece accommodating groove (28).

6. The resistance welding device according to claim 2, characterized in that: The connecting terminal (13) further comprises an axial support (133), and the outlet terminal (121) is wound around the axial support (133), wherein the outlet terminal (121) that is pressed off remains connected to the axial support (133).

7. A method for welding the outlet end of a stator winding, characterized in that: include: A stator (1) and a resistance welding device (2) according to any one of claims 1 to 6 are provided; Lifting the resistance welding device (2) in the axial direction; The resistance welding device (2) presses and welds the plurality of connection terminals (13) and the plurality of outlet terminals (121) in sequence along the circumferential direction.

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