Grounding sleeve

Abstract

The grounding sleeve comprises a sleeve body and sleeve gaskets arranged on the inner walls and / or the outer walls of the two ends of the sleeve body, the side wall of the sleeve body is provided with an opening, the opening is through along the axial direction of the sleeve body, the opening is used for clamping a stator winding cable into the sleeve body, and the sleeve body is used for being arranged in a stator groove. The sleeve gaskets are arranged at the two ends of the sleeve body, so that the contact effect between the sleeve body and a stator slot and a stator winding cable can be effectively improved, and the connection stability of the grounding sleeve and the timely discharge of induction current are further ensured.

Description

Technical Field

[0001] This utility model relates to the field of rail vehicle technology, and in particular to a grounding bushing. Background Technology

[0002] The stator winding of high-speed maglev uses unarmored cable, and its grounding is generally connected to the cable shield and sheath by a ring metal to ensure reliable discharge of current on the cable surface.

[0003] Currently, high-speed maglev stator windings typically use semi-closed metal bushings for grounding. However, mechanical vibrations generated during vehicle operation and the electrodynamic force generated by the stator current can make the metal bushing grounding unreliable, leading to problems such as stator winding falling.

[0004] Therefore, how to improve the contact stability between the stator winding and the grounding bushing is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] The purpose of this invention is to provide a grounding bushing that can effectively improve the contact stability between the stator winding and the grounding bushing.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A grounding bushing includes: a bushing body and bushing gaskets disposed on the inner and / or outer walls at both ends of the bushing body. The side wall of the bushing body is provided with an opening that extends through the axial direction of the bushing body. The opening is used to allow a stator winding cable to be inserted into the bushing body. The bushing body is used to be placed in a stator slot.

[0008] In some embodiments, the inner wall of the bushing body is provided with an inwardly protruding inner protrusion for contacting the stator winding cable.

[0009] In some embodiments, the outer wall of the sleeve body is provided with an outwardly protruding protrusion, which is used to contact the inner wall of the stator slot.

[0010] In some embodiments, the inner wall of the sleeve body is provided with multiple rows of inner protrusions distributed in a circumferential direction, and the outer wall of the sleeve body is provided with multiple rows of outer protrusions distributed in a circumferential direction.

[0011] In some embodiments, the inner protrusion is formed by stamping inward from the outside of the sleeve body, and the outer protrusion is formed by stamping outward from the inside of the sleeve body.

[0012] In some embodiments, the height of the inner protrusion and the outer protrusion is not greater than half the thickness of the sleeve body.

[0013] In some embodiments, the thickness of the sleeve gasket is not less than the difference between the inner walls at both ends of the stator slot and the inner wall in the middle of the stator slot, and is not greater than 1.5 times the difference.

[0014] In some embodiments, the opening is provided with outwardly folded flanges on both sides.

[0015] In some embodiments, the flange is used to engage with the inner wall of the stator slot.

[0016] In some embodiments, the sleeve body is made of non-magnetic stainless steel with an elastic modulus of 160~200 MPa.

[0017] Compared with existing technologies, the above technical solution has the following advantages:

[0018] This utility model provides a grounding bushing, comprising: a bushing body and bushing gaskets disposed on the inner and / or outer walls of the bushing body at both ends. The bushing body has openings on its side walls, extending axially along the bushing body, for inserting stator winding cables into the bushing body. The bushing body is positioned within a stator slot. By providing bushing gaskets at both ends of the bushing body, the contact effect between the bushing body and the stator slots and stator winding cables can be effectively improved, thereby ensuring the connection stability of the grounding bushing and the timely discharge of induced current. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0020] Figure 1 A three-dimensional structural diagram of a grounding bushing provided for a specific embodiment of this utility model;

[0021] Figure 2 This is a schematic diagram of the end face structure of a grounding bushing provided for a specific embodiment of the present utility model.

[0022] The attached figures are labeled as follows:

[0023] 1-Casing body, 2-Casing gasket, 3-Concave-convex array, 4-Flanged edge. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please refer to Figure 1 and Figure 2 , Figure 1 A three-dimensional structural diagram of a grounding bushing provided for a specific embodiment of this utility model; Figure 2 This is a schematic diagram of the end face structure of a grounding bushing provided for a specific embodiment of the present utility model.

[0026] This utility model provides a grounding bushing, comprising: a bushing body 1 and bushing gaskets 2 disposed on the inner walls and / or outer walls at both ends of the bushing body 1. Specifically, bushing gaskets 2 can be disposed on the inner walls at both ends of the bushing body 1, or on the outer walls at both ends of the bushing body 1, or simultaneously on both the inner and outer walls at both ends of the bushing body 1. Figure 1 As shown, the side wall of the bushing body 1 has an opening that extends axially along the bushing body 1. The width of the opening is smaller than the diameter of the bushing body 1. The opening is used to allow the stator winding cable to be inserted into the bushing body 1, which is then placed within the stator slot. During the manufacturing process of the stator slot, to facilitate demolding, there is a draft angle at both ends, resulting in a larger radial dimension at both ends than at the center. This leads to a larger gap between the existing grounding bushing ends and the stator slot ends, causing ineffective contact between the grounding bushing ends and the stator slot and stator winding cable during use. This application addresses this by providing bushing gaskets 2 at both ends of the bushing body 1, effectively improving the contact between the bushing body 1 and the stator slot and stator winding cable, thereby ensuring the connection stability of the grounding bushing and the timely discharge of induced current.

[0027] In some embodiments, the sidewall of the bushing body 1 is provided with a concave-convex array 3 to facilitate contact with the stator winding cable and the stator slot. Specifically, the inner wall of the bushing body 1 is provided with an inwardly protruding inner protrusion for contact with the stator winding cable, which improves the contact effect between the bushing body 1 and the stator winding. The outer wall of the bushing body 1 is provided with an outwardly protruding outer protrusion for contact with the inner wall of the stator slot, which also improves the contact effect between the bushing body 1 and the stator slot.

[0028] In some embodiments, the inner wall of the sleeve body 1 is provided with multiple rows of inner protrusions distributed along the circumferential direction, and the outer wall of the sleeve body 1 is provided with multiple rows of outer protrusions distributed along the circumferential direction. For example, four rows of inner protrusions can be provided on the inner wall of the sleeve body 1, the four rows of inner protrusions being symmetrically distributed about the central axis of the sleeve body 1, and each row of inner protrusions including several protrusion structures; four rows of outer protrusions can be provided on the outer wall of the sleeve body 1, the inner protrusions and outer protrusions being located on the same row, and preferably interleaved, that is, there is one outer protrusion between two inner protrusions, and one inner protrusion between two outer protrusions. It should be noted that the inner and outer protrusions can also be arranged in other ways, and the specific arrangement can be selected according to actual needs.

[0029] In some embodiments, the inner protrusion is formed by stamping from the outside of the sleeve body 1 inward, and the outer protrusion is formed by stamping from the inside of the sleeve body 1 outward. That is, the inner and outer protrusions are integrally formed on the sleeve body 1, which can effectively reduce manufacturing costs.

[0030] In some embodiments, the height of the inner and outer protrusions is no greater than half the thickness of the bushing body 1, so as to increase the friction between the outer and inner surfaces of the bushing body 1, thereby ensuring the connection stability between the bushing body 1 and the stator slot and stator winding cable.

[0031] In some embodiments, the thickness of the bushing gasket 2 is not less than the difference between the inner walls at both ends of the stator slot and the inner wall in the middle of the stator slot, and not greater than 1.5 times the difference. This difference is the axial projection length of the draft angle at the end of the stator slot. Through the above-described thickness design of the bushing gasket 2, reliable contact between the bushing body 1 and the stator slot and stator winding cable can be ensured.

[0032] In some embodiments, such as Figure 1 and Figure 2 As shown, outwardly folded flanges 4 are provided on both sides of the opening. These flanges 4 prevent the opening of the bushing body 1 from scratching the stator winding cable and also serve as a circumferential limit to prevent the bushing body 1 from rotating within the stator slot. The flanges 4 are preferably straight strip-shaped structures. The included angle between the two flanges 4 can be preset according to the structure of the inner wall of the stator slot opening. The included angle between the tangent of the flange 4 in contact with the arc section of the bushing body 1 and the plane where the flange is located is preferably between 48° and 50° to ensure the supporting rigidity of the grounding bushing.

[0033] In some embodiments, the flange 4 is used to snap onto the inner wall of the stator slot opening, wherein the outer surface of the flange 4 contacts the inner wall of the stator slot opening, and the arc-shaped surface of the bushing body 1 is used to contact and fit against the inner surface of the stator slot. During specific installation, since the slot opening of the high-magnetic levitation stator slot faces downward, the stator winding cable is subjected to downward gravity. Since the opening of the bushing body 1 is a constricted structure, it can prevent the stator winding cable from falling out of the stator slot. When the vehicle is running, the stator winding cable is subjected to magnetic force, forming a downward force. At this time, the mechanical force acts on the arc of the bushing body 1, causing the arc to deform, making the opening smaller, so as to prevent the stator winding cable from falling.

[0034] In some embodiments, the bushing body 1 is made of non-magnetic stainless steel with an elastic modulus of 160~200Mpa, which can reduce the vibration of the grounding bushing during vehicle operation. Therefore, it can prevent the stator winding cable from sliding inside the bushing body 1 when the vehicle vibrates, thereby ensuring reliable contact between the grounding bushing and the stator winding cable and ensuring timely discharge of induced current.

[0035] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0036] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0037] The above provides a detailed description of a grounding bushing provided by this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the core idea of ​​this utility model. It should be noted that those skilled in the art can make several improvements and modifications to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A grounding bushing, characterized in that, include: The bushing body and bushing gaskets provided on the inner and / or outer walls at both ends of the bushing body, the side wall of the bushing body is provided with an opening, the opening is axially extending through the bushing body, the opening is used for the stator winding cable to be inserted into the bushing body, and the bushing body is used to be placed in the stator slot.

2. The grounding bushing according to claim 1, characterized in that, The inner wall of the bushing body is provided with an inwardly protruding inner protrusion, which is used to contact the stator winding cable.

3. The grounding bushing according to claim 2, characterized in that, The outer wall of the sleeve body is provided with an outwardly protruding protrusion, which is used to contact the inner wall of the stator slot.

4. The grounding bushing according to claim 3, characterized in that, The inner wall of the sleeve body is provided with multiple rows of inner protrusions distributed along the circumferential direction, and the outer wall of the sleeve body is provided with multiple rows of outer protrusions distributed along the circumferential direction.

5. The grounding bushing according to claim 4, characterized in that, The inner protrusion is formed by stamping from the outside of the sleeve body inward, and the outer protrusion is formed by stamping from the inside of the sleeve body outward.

6. The grounding bushing according to claim 3, characterized in that, The height of the inner protrusion and the outer protrusion shall not exceed half the thickness of the sleeve body.

7. The grounding bushing according to any one of claims 1 to 6, characterized in that, The thickness of the sleeve gasket is not less than the difference between the inner walls at both ends of the stator slot and the inner wall in the middle of the stator slot, and is not greater than 1.5 times the difference.

8. The grounding bushing according to any one of claims 1 to 6, characterized in that, The opening has outward-folding flanges on both sides.

9. The grounding bushing according to claim 8, characterized in that, The flange is used to engage with the inner wall of the stator slot.

10. The grounding bushing according to any one of claims 1 to 6, characterized in that, The sleeve body is made of non-magnetic stainless steel with an elastic modulus of 160~200Mpa.

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