Plane commutator copper shell

Abstract

The utility model relates to the technical field of commutators, in particular to a plane commutator copper shell. The copper shell comprises a copper shell body, the copper shell body comprises an outer side part and a bottom part, the bottom part comprises an edge outer ring and a plurality of welding parts, gaps exist among the welding parts, and radial grooves are formed in the inner wall of the copper shell body and correspond to the gaps among the welding parts; the outer side part comprises a lower ring part and an upper ring part, a plurality of upper raw material parts are arranged on the upper ring part, the upper raw material parts are separated by gaps, axial first heat dissipation holes are formed in the positions, located at the two ends of the upper raw material parts, of the outer side part, and a plurality of second heat dissipation holes communicated with the first heat dissipation holes are formed in the peripheral surface of the lower ring part; third heat dissipation holes communicated with the first heat dissipation holes are formed in the end, close to the edge outer ring, of the welding part, and the two ends of the third heat dissipation holes are communicated with the side walls of the radial grooves in the two ends of the welding part correspondingly; according to the utility model, after the prior art is improved, the radiating effect of the commutator segment after the copper shell is processed and manufactured is good, and the overall performance and the stability of the commutator can be greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of commutators, in particular to a copper shell of a planar commutator. Background Art

[0002] Commutators are generally divided into three types: hook type, slot type and plane type. The plane commutator is named because its working surface is a plane. The commutator basically includes commutator segments, insulating body and carbon segments. The commutator segments include copper layer, carbon layer and hook part. In the production process, a cold extruded copper shell is first used, and the copper shell is repeatedly turned and slotted to form a complete copper shell. The copper shell is then welded to the carbon sheet, and the welded carbon sheet and copper shell are placed in the mold. The insulating body is formed by injecting phenolic resin, and finally the hook part is formed by milling and bending the hook.

[0003] For example, a Chinese patent document with authorization number CN212485751U discloses a commutator copper shell, including a copper shell member, the copper shell member includes an outer side and a bottom, the bottom includes an edge outer ring and multiple welding parts, there are gaps between the multiple welding parts, the copper shell member is fixedly provided with an inner convex edge on the inner side, the inner convex edge is arranged one-to-one with the welding part, the two sides of the inner convex edge in the vertical direction are flush with the two sides of the welding part in the vertical direction, the outer side includes a lower ring part and an upper ring part, the diameter of the lower ring part is larger than the diameter of the upper ring part; the upper ring part is provided with multiple upper raw material parts for forming the hook part, and the upper raw material parts are separated by gaps; however, in a DC motor, since the commutator needs to frequently switch the current direction, a large amount of heat will be generated inside it, and the commutator segments made of the above-mentioned commutator copper shell have poor heat dissipation effect, which may cause the commutator segment temperature to be too high, thereby affecting the overall performance and stability of the commutator.

[0004] Therefore, it is necessary to improve the deficiencies in the above prior art. Summary of the invention

[0005] The technical problem to be solved by the utility model is to provide a planar commutator copper shell in view of the deficiencies of the above-mentioned prior art, so as to solve the problem that the commutator segments made of the commutator copper shell in the prior art have poor heat dissipation effect, which may cause the commutator segment temperature to be too high, thereby affecting the overall performance and stability of the commutator.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a planar commutator copper shell, comprising a copper shell member, the copper shell member comprising an outer side and a bottom, the bottom comprising an edge outer ring and a plurality of welding parts, there are gaps between the plurality of welding parts, and radial grooves are arranged on the inner wall of the copper shell member corresponding to the gaps between the welding parts; the outer side comprises a lower ring part and an upper ring part, the upper ring part is provided with a plurality of upper raw material parts for forming a hook part, the upper raw material parts are separated by gaps, the outer side is provided with axial first heat dissipation holes at both ends of the upper raw material part, a plurality of second heat dissipation holes connected with the first heat dissipation holes are arranged on the outer peripheral surface of the lower ring part, a third heat dissipation hole connected with the first heat dissipation hole is arranged at one end of the welding part close to the edge outer ring, and the two ends of the third heat dissipation hole are respectively connected with the side walls of the radial grooves at both ends of the welding part.

[0007] By adopting the above technical solution, during the rotation process of the processed commutator segment, heat is ventilated and dissipated from the upper end of the upper raw material part (i.e., both sides of the bent hook) through the first heat dissipation hole, heat is ventilated and dissipated from the outer peripheral surface of the lower ring part (i.e., the outer peripheral side surface of the commutator segment) through the second heat dissipation hole, and heat is ventilated and dissipated from the gaps at both ends of the welding part (i.e., both sides of the commutator segment) through the third heat dissipation hole. Since the first heat dissipation hole, the second heat dissipation hole and the third heat dissipation hole are interconnected, the air flowability inside the commutator segment is further enhanced, so that the commutator segment manufactured by the above copper shell processing has a good heat dissipation effect, which can greatly improve the overall performance and stability of the commutator.

[0008] The above technical solution is further configured as follows: an axial triangular convex strip is further provided on the outer peripheral surface of the lower ring portion.

[0009] By adopting the above technical solution, the heat dissipation area of ​​the outer peripheral surface of the lower ring portion can be increased by providing the triangular convex strips, thereby further improving the heat dissipation effect of the commutator segment.

[0010] The above technical solution is further configured as follows: an inner hook is connected to the inner bottom wall of the welding portion, and the middle portion of the inner hook is bent toward the inner wall of the copper shell.

[0011] By adopting the above technical solution, bakelite powder is injected into the mold and die-cast to form an insulating body. When the insulating body is pulled in a direction away from the commutator copper shell, the bent portion of the inner hook abuts against the insulating body and applies a reaction force in the direction of the commutator copper shell, thereby limiting the separation of the insulating body from the commutator copper shell. The inner hook improves the connection strength between the insulating body and the commutator copper shell.

[0012] The above technical solution is further configured as follows: the copper shell is fixedly provided with an inclined inner convex edge on the inner side, the inner convex edge is arranged in a one-to-one correspondence with the welding part, and both sides of the inner convex edge in the vertical direction are flush with both sides of the welding part in the vertical direction.

[0013] By adopting the above technical solution, when bakelite powder is die-cast to form an insulating body and the insulating body is pulled away from the commutator copper shell, the inclined inner convex edge limits the separation of the insulating body and the commutator copper shell, further improving the connection strength between the insulating body and the commutator copper shell.

[0014] The above technical solution is further configured as follows: the diameter of the lower ring portion is greater than the diameter of the upper ring portion.

[0015] Using the above technical solution, after the copper shell is welded and fixed to the carbon sheet, it needs to be placed in the mold for injection molding. In the process of placing the copper shell into the mold, the equipment needs to press and clamp the outer wall of the outer part of the copper shell to achieve the movement of the product. There is a drop between the upper ring part and the lower ring part, which is convenient for the later equipment to position, clamp and limit the copper shell.

[0016] The above technical solution is further configured as follows: a raised tin brushing portion is provided at the bottom of the welding portion.

[0017] By adopting the above technical solution, after solder paste is brushed on the raised solder brushing part at the bottom of the soldering part, it is convenient to fix the soldering part and the carbon sheet by soldering with solder paste.

[0018] The beneficial effect achieved by the utility model is that the commutator segments manufactured by copper shell processing have good heat dissipation effect, which can greatly improve the overall performance and stability of the commutator. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of the embodiment of the utility model Figure 1 ;

[0020] Figure 2 This is a schematic diagram of the structure of the embodiment of the utility model Figure 2 ;

[0021] Figure 3 It is a cross-sectional view of an embodiment of the utility model Figure 1 ;

[0022] Figure 4 It is a cross-sectional view of an embodiment of the utility model Figure 2 . DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] like Figure 1-4As shown in, a planar commutator copper shell comprises a copper shell member 1, the copper shell member 1 comprises an outer side 2 and a bottom 3, the bottom 3 comprises an edge outer ring 4 and a plurality of welding portions 5, there are gaps between the plurality of welding portions 5, and radial grooves 6 are arranged on the inner wall of the copper shell member 1 corresponding to the gaps between the welding portions 5; the outer side 2 comprises a lower ring portion 21 and an upper ring portion 22, the upper ring portion 22 is provided with a plurality of upper raw material portions 221 for forming hook portions, the upper raw material portions 221 are separated by gaps, the outer side 2 is provided with axial first heat dissipation holes 7 at both ends of the upper raw material portions 221, a plurality of second heat dissipation holes 8 connected with the first heat dissipation holes 7 are arranged on the outer circumferential surface of the lower ring portion 21, a third heat dissipation hole 9 connected with the first heat dissipation hole 7 is arranged at one end of the welding portion 5 close to the edge outer ring 4, the two ends of the third heat dissipation hole 9 are respectively connected with the side walls of the radial grooves 6 at both ends of the welding portion 5, and an axial triangular convex strip 211 is also arranged on the outer circumferential surface of the lower ring portion 21. An inner hook 51 is connected to the inner bottom wall of the welding part 5, and the middle part of the inner hook 51 is bent toward the inner wall of the copper shell 1. The inner convex edge 11 is fixedly arranged on the inner side of the copper shell 1, and the inner convex edge 11 is arranged one-to-one with the welding part 5. The two sides of the inner convex edge 11 in the vertical direction are flush with the two sides of the welding part 5 in the vertical direction. The diameter of the lower ring part 21 is greater than the diameter of the upper ring part 22, and a raised tin brushing part 52 is provided at the bottom of the welding part 5.

[0025] In the above embodiment, during the rotation of the processed commutator segment, the first heat dissipation hole 7 is used to dissipate heat from the upper end of the upper raw material portion 221 (i.e., both sides of the hook), the second heat dissipation hole 8 is used to dissipate heat from the outer peripheral surface of the lower ring portion 21 (i.e., the outer peripheral side surface of the commutator segment), and the third heat dissipation hole 9 is used to dissipate heat from the gaps at both ends of the welding portion 5 (i.e., both sides of the commutator segment). Since the first heat dissipation hole 7, the second heat dissipation hole 8 and the third heat dissipation hole 9 are interconnected, the air flowability inside the commutator segment is further enhanced; by arranging the triangular convex strip 211 on the outer peripheral surface of the lower ring portion 21, the heat dissipation area of ​​the outer peripheral surface of the lower ring portion 21 can be increased, and the heat dissipation effect of the commutator segment can be further improved, so that the commutator segment manufactured by the above copper shell has a good heat dissipation effect, which can greatly improve the overall performance and stability of the commutator.

Claims

1. A copper shell of a planar commutator, comprising a copper shell member, the copper shell member comprising an outer portion and a bottom portion, the bottom portion comprising an outer edge ring and a plurality of welding portions, gaps between the plurality of welding portions, radial grooves are provided on the inner wall of the copper shell member corresponding to the gaps between the welding portions; the outer portion comprises a lower ring portion and an upper ring portion, the upper ring portion is provided with a plurality of upper raw material portions for forming a hook portion, the upper raw material portions are separated by gaps, and characterized in that: The outer portion is provided with axial first heat dissipation holes at both ends of the upper raw material portion, a plurality of second heat dissipation holes connected to the first heat dissipation holes are provided on the outer circumferential surface of the lower ring portion, and a third heat dissipation hole connected to the first heat dissipation hole is provided at one end of the outer ring near the edge of the welding portion, and both ends of the third heat dissipation hole are respectively connected to the side walls of the radial grooves at both ends of the welding portion.

2. The planar commutator copper shell according to claim 1, characterized in that: The outer peripheral surface of the lower ring portion is also provided with an axial triangular convex strip.

3. A planar commutator copper shell according to any one of claims 1-2, characterized in that: An inner hook is connected to the inner bottom wall of the welding portion, and the middle portion of the inner hook is bent toward the inner wall of the copper shell.

4. The planar commutator copper shell according to claim 3, characterized in that: The copper shell is fixedly provided with an inclined inner convex edge on the inner side, the inner convex edge is arranged in one-to-one correspondence with the welding part, and the two sides of the inner convex edge in the vertical direction are flush with the two sides of the welding part in the vertical direction.

5. The planar commutator copper shell according to claim 4, characterized in that: The diameter of the lower ring portion is greater than the diameter of the upper ring portion.

6. The planar commutator copper shell according to claim 5, characterized in that: A raised tin brushing portion is provided at the bottom of the welding portion.

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