A high-efficiency heat dissipation structure of a motor stator coil

Abstract

This invention provides a high-efficiency heat dissipation structure for motor stator coils, relating to the technical field of motor winding insulation and heat dissipation structures. It includes: a stator core with stator slots; winding coils disposed within the stator slots; multiple thermally conductive insulating elastomers connected together to form a flexible insulating sleeve, which wraps around the winding coils and is inserted into the stator slots; and multiple shape memory alloy plates correspondingly disposed within each thermally conductive insulating elastomer. Below a threshold temperature, the thermally conductive insulating elastomers expand outwards to fill gaps for efficient heat dissipation; above the threshold temperature, the shape memory alloy plates cause the thermally conductive insulating elastomers to curl and contract, separating from the slot walls to block heat. This invention achieves increased heat transfer as the thermally conductive insulating elastomers expand and fill gaps, and when the temperature exceeds the threshold, the shape memory alloy plates curl to form air gaps, preventing heat transfer to the stator core and protecting the core; each section is independent, and when an abnormal section is blocked from heat, the remaining normal sections still maintain efficient heat dissipation, balancing local protection and overall heat dissipation.

Description

Technical Field

[0001] This invention relates to the field of motor winding insulation and heat dissipation structure technology, and in particular to a high-efficiency heat dissipation structure for motor stator coils. Background Technology

[0002] During motor operation, the winding coils generate a large amount of heat due to the current flowing through them. If this heat cannot be dissipated in time, the winding temperature will continue to rise, accelerating the aging of the insulation material. In severe cases, this can lead to inter-turn short circuits or grounding breakdowns, ultimately causing the motor to burn out. Therefore, winding heat dissipation is a key technical issue in motor design.

[0003] Currently, the main methods for heat dissipation of motor stator windings are as follows: First, insulating paper is placed in the stator slots as slot insulation. Heat is conducted to the stator core through the insulating paper and then dissipated outwards. However, traditional insulating paper has a low thermal conductivity and limited heat transfer efficiency. Second, cooling channels are set on the stator core or housing to remove heat through a cooling medium. However, this method requires an additional cooling system, which is complex and costly. Third, thermally conductive potting materials are used to fill the gap between the windings and the core to improve thermal conductivity. However, once the potting material cures, it is irreversible. If a local fault occurs in the winding, it is impossible to isolate the faulty area, and the entire winding must be replaced or scrapped.

[0004] Furthermore, during winding installation, an unavoidable gap exists between the winding and the stator slot wall. The air remaining in these gaps forms a high thermal resistance layer, severely hindering heat conduction from the winding to the core. Current technology lacks a heat dissipation structure that can both adaptively eliminate installation gaps and achieve efficient heat dissipation during normal operation, and actively cut off the thermal path and protect the stator core in case of abnormal overheating. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a high-efficiency heat dissipation structure for motor stator coils.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A high-efficiency heat dissipation structure for motor stator coils includes: a stator core with stator slots; a winding coil housed within the stator slots; a thermally conductive insulating elastomer, wherein multiple thermally conductive insulating elastomers are arranged axially and connected to form a flexible insulating sleeve, the flexible insulating sleeve wrapping around the outside of the winding coil and inserted into the stator slots; and shape memory alloy plates, wherein multiple shape memory alloy plates are embedded one-to-one within each of the thermally conductive insulating elastomers; wherein, below a threshold temperature, the thermally conductive insulating elastomers expand outward upon heating, filling the gap between the flexible insulating sleeve and the stator slot wall, forming a close-fitting, high-efficiency heat dissipation mode; above the threshold temperature, the shape memory alloy plates at the corresponding positions curl, causing the thermally conductive insulating elastomers to contract inward, separating their outer surface from the stator slot wall and forming an air gap, switching to a thermal blocking protection mode.

[0007] Preferably, the thermally conductive and insulating elastomer includes an elastomer connecting portion, an elastomer clamping portion, and an elastomer bending portion. Two elastomer clamping portions are symmetrically arranged at both ends of the elastomer connecting portion, and the elastomer bending portion is fastened between the corresponding elastomer connecting portion and the end of the elastomer clamping portion.

[0008] Preferably, the shape memory alloy plate includes an alloy plate connecting part, an alloy plate clamping part, and an alloy plate bending part. Two alloy plate clamping parts are symmetrically arranged at both ends of the alloy plate connecting part, and the elastic body bending part is fastened between the corresponding alloy plate connecting part and the end of the alloy plate clamping part.

[0009] Preferably, the thermally conductive insulating elastomer has an internal receiving groove for fitting and accommodating a shape memory alloy plate.

[0010] Preferably, the outer surface of the thermally conductive insulating elastomer is coated with a surface reinforcement layer, which is in contact with the groove wall of the stator slot.

[0011] Preferably, the inner surface of the thermally conductive insulating elastomer is provided with an adhesive layer, which is bonded to the outer surface of the winding coil.

[0012] Preferably, the stator core includes a core body, and a plurality of stator slots are spaced apart along the inner circumferential surface of the core body. Each stator slot accommodates a set of winding coils and a flexible insulating sleeve that wraps the winding coils.

[0013] Preferably, the thermally conductive insulating elastomer is made of thermally conductive silicone rubber or thermally conductive polyurethane.

[0014] Preferably, two adjacent elastomer connecting portions are fastened together, and two adjacent elastomer clamping portions are slidably connected together.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. Utilizing the characteristic that the thermal expansion coefficient of the thermally conductive insulating elastomer is greater than that of the stator core, the flexible insulating sleeve actively expands outward when the winding coil temperature rises, automatically filling the installation gap and microscopic unevenness. The higher the temperature, the greater the expansion, the smaller the gap, and the lower the contact thermal resistance, achieving heat-driven adaptive fitting. This effectively solves the problem of not being able to guarantee the gap during winding coil installation, forming a highly efficient heat dissipation mode that can transfer heat more effectively as the temperature rises. 2. When the temperature exceeds the threshold, the shape memory alloy plate curls up instantly. Its curling force is much greater than the expansion force of the thermally conductive insulating elastomer, forcibly causing the flexible insulating sleeve to contract inward. An air gap is actively formed between the flexible insulating sleeve and the stator slot wall, switching the high-efficiency heat dissipation mode to the thermal blocking protection mode, preventing a large amount of heat from being transferred to the stator core, so as to protect the stator core, a core component with high repair costs. 3. Multiple thermally conductive and insulating elastomers are arranged in segments along the axial direction, with each segment's shape memory alloy plate independent of the others. When a segment switches to thermal blocking protection mode due to abnormal overheating, the remaining segments with normal temperatures are unaffected and continue to maintain contact for efficient heat dissipation. This mechanism protects the abnormal segment while maintaining the heat dissipation capacity of the rest of the motor, facilitating indirect heat dissipation through adjacent segments during thermal blocking. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the high-efficiency heat dissipation structure of the motor stator coil in an embodiment of the present invention; Figure 2 This is a schematic diagram of the core body structure in the high-efficiency heat dissipation structure of the motor stator coil according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the thermally conductive insulating elastomer structure in the high-efficiency heat dissipation structure of the motor stator coil according to an embodiment of the present invention; Figure 4 This is a schematic diagram showing the positions of the surface reinforcement layer and adhesive layer in the high-efficiency heat dissipation structure of the motor stator coil according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the internal structure of the thermally conductive insulating elastomer in the high-efficiency heat dissipation structure of the motor stator coil according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the thermally conductive insulating elastomer in the high-efficiency heat dissipation structure of the motor stator coil in an embodiment of the present invention under thermal expansion. Figure 7 This is a schematic diagram of the shape memory alloy plate in the deformed state in the high-efficiency heat dissipation structure of the motor stator coil according to an embodiment of the present invention; Figure 8 for Figure 2 Enlarged view of the structure at point A in the image.

[0017] In the diagram: 10, stator core; 101, core body; 102, stator slot; 20, winding coil; 30, thermally conductive and insulating elastomer; 301, elastomer connection part; 302, elastomer clamping part; 303, elastomer bending part; 40, shape memory alloy plate; 401, alloy plate connection part; 402, alloy plate clamping part; 403, alloy plate bending part; 50, surface reinforcement layer; 60, adhesive layer; 70, receiving groove. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0019] The terms used in this invention, such as "upper," "lower," "left," "right," "middle," and "one," are merely for clarity of description and are not intended to limit the scope of the invention. Any changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0020] like Figures 1-8 As shown, this embodiment of the invention provides a high-efficiency heat dissipation structure for a motor stator coil, comprising: a stator core 10, wherein the stator core 10 has stator slots 102; a winding coil 20, wherein the winding coil 20 is accommodated within the stator slots 102; a thermally conductive insulating elastomer 30, wherein multiple thermally conductive insulating elastomers 30 are arranged axially and connected to form a flexible insulating sleeve, the flexible insulating sleeve wraps around the outside of the winding coil 20 and is inserted into the stator slots 102; and a shape memory alloy plate 40, wherein multiple shape memory alloy plates 40 are embedded one-to-one within each thermally conductive insulating elastomer 30; wherein, when the temperature is below a threshold temperature, the thermally conductive insulating elastomer 30 expands outward due to heat, filling the gap between the flexible insulating sleeve and the slot wall of the stator slot 102, forming a close-fitting and highly efficient heat dissipation mode; when the temperature exceeds the threshold temperature, the shape memory alloy plate 40 at the corresponding position curls, causing the thermally conductive insulating elastomer 30 to contract inward, causing its outer surface to separate from the slot wall of the stator slot 102 and form an air gap, switching to a thermal blocking protection mode.

[0021] In this embodiment, under normal motor operation, the temperature of the winding coil 20 is below the threshold temperature. As the winding coil 20 heats up due to energization, the thermally conductive insulating elastomer 30 surrounding it expands outwards. Since the thermal expansion coefficient of the thermally conductive insulating elastomer 30 is greater than that of the stator core 10, the thermally conductive insulating elastomer 30 actively expands outwards after being heated, fully filling the installation gap and microscopic unevenness gaps between the flexible insulating sleeve and the stator slot 102 wall. The higher the temperature, the greater the expansion of the thermally conductive insulating elastomer 30, the smaller the gap, and the contact thermal resistance continues to decrease. Heat is efficiently transferred from the winding coil 20 to the stator core 10 via the thermally conductive insulating elastomer 30 and dissipated outwards, forming a highly efficient heat dissipation mode where the hotter it gets, the more heat it can transfer. This process eliminates gaps that cannot be guaranteed during the installation of the winding coil 20 through heat-driven adaptive bonding. When an abnormal operating condition occurs in the motor, causing a sharp rise in local temperature that exceeds the threshold temperature, the shape memory alloy plate 40 embedded in the thermally conductive insulating elastomer 30 corresponding to the abnormal section reaches its austenitic phase transformation end temperature, and the shape memory alloy plate 40 instantly curls up. The curling force of the shape memory alloy plate 40 is much greater than the thermal expansion force of the thermally conductive insulating elastomer 30 itself, forcibly causing the embedded thermally conductive insulating elastomer 30 to contract inward, causing the outer surface of the thermally conductive insulating elastomer 30 to separate from the slot wall of the stator slot 102, actively creating a clear air gap between them, completing the switch from high-efficiency heat dissipation mode to thermal blocking protection mode. At this time, the heat generated by the winding coil 20 in this abnormal section is difficult to be transferred to the stator core 10 in large quantities due to the existence of the air gap, thus protecting the stator core 10. Because multiple thermally conductive and insulating elastomers 30 are arranged in segments along the axial direction and the shape memory alloy plates 40 within each segment are independent of each other, when a segment switches to thermal blocking protection mode due to excessive temperature, the other segments with normal temperatures are unaffected. Their thermally conductive and insulating elastomers 30 continue to maintain contact with the stator slot 102 wall, continuously performing efficient heat dissipation. This segmented independent operation mechanism allows the abnormal segment to be protected while the other normal segments can still dissipate heat in a timely manner, helping the abnormal segment to indirectly dissipate heat to a certain extent through adjacent segments even in thermal blocking mode.

[0022] like Figure 4 As shown, optionally, the thermally conductive and insulating elastomer 30 includes an elastomer connecting portion 301, an elastomer clamping portion 302, and an elastomer bending portion 303. The two elastomer clamping portions 302 are symmetrically arranged at both ends of the elastomer connecting portion 301, and the elastomer bending portion 303 is fastened between the corresponding ends of the elastomer connecting portion 301 and the elastomer clamping portion 302.

[0023] In this embodiment, the elastomer connecting portion 301 is located at the bottom of the thermally conductive and insulating elastomer 30, abutting against the bottom side of the winding coil 20. Two elastomer clamping portions 302 are symmetrically arranged at the left and right ends of the elastomer connecting portion 301, respectively abutting against the left and right sides of the winding coil 20. The elastomer bending portion 303 connects the ends of the elastomer connecting portion 301 and the elastomer clamping portion 302, so that the three form an integral structure with a U-shaped cross-section. This U-shaped thermally conductive and insulating elastomer 30 wraps around the winding coil 20 from three sides (bottom and sides), increasing the contact area between it and the winding coil 20, widening the channel for heat transfer from the winding coil 20 to the thermally conductive and insulating elastomer 30, thereby improving the heat conduction efficiency.

[0024] like Figure 5 As shown, optionally, the shape memory alloy plate 40 includes an alloy plate connecting part 401, an alloy plate clamping part 402, and an alloy plate bending part 403. The two alloy plate clamping parts 402 are symmetrically arranged at both ends of the alloy plate connecting part 401, and the elastic body bending part 303 is fastened between the corresponding alloy plate connecting part 401 and the end of the alloy plate clamping part 402.

[0025] In this embodiment, the alloy plate connecting portion 401 is embedded inside the elastomer connecting portion 301, and the two alloy plate clamping portions 402 are respectively embedded inside the two elastomer clamping portions 302. The alloy plate bending portion 403 is embedded inside the elastomer bending portion 303, so that the overall cross-section of the shape memory alloy plate 40 is U-shaped, matching the thermally conductive and insulating elastomer 30. When the temperature exceeds the threshold temperature, the alloy plate connecting portion 401, the alloy plate clamping portion 402, and the alloy plate bending portion 403 curl synchronously, contracting from the bottom and both sides towards the U-shaped opening of the shape memory alloy plate 40, causing the elastomer connecting portion 301, the elastomer clamping portion 302, and the elastomer bending portion 303 to contract uniformly inward, so that the outer surface of the thermally conductive and insulating elastomer 30 simultaneously detaches from the stator slot 102 wall in the circumferential direction, forming a continuous and complete air gap.

[0026] like Figure 7 As shown, optionally, the thermally conductive insulating elastomer 30 has a receiving groove 70 inside, which is used to fit and receive the shape memory alloy plate 40.

[0027] In this embodiment, the thermally conductive insulating elastomer 30 has an internal receiving groove 70, the shape and size of which match the shape memory alloy plate 40. The receiving groove 70 is pre-formed during the molding of the thermally conductive insulating elastomer 30. The shape memory alloy plate 40 is fitted and installed within the receiving groove 70, and the groove wall of the receiving groove 70 completely covers and positions the shape memory alloy plate 40. During operation, the receiving groove 70 ensures that the position of the shape memory alloy plate 40 within the thermally conductive insulating elastomer 30 does not shift. When the shape memory alloy plate 40 is rolled up, its rolling force acts directly on the body material of the thermally conductive insulating elastomer 30 through the groove wall of the receiving groove 70, causing the entire thermally conductive insulating elastomer 30 to contract inward.

[0028] like Figure 4 As shown, optionally, the outer surface of the thermally conductive insulating elastomer 30 is coated with a surface reinforcement layer 50, which contacts the groove wall of the stator groove 102.

[0029] In this embodiment, the surface reinforcement layer 50 covers the entire outer surface of the flexible insulating sleeve facing the stator slot 102 wall. The surface reinforcement layer 50 can be made of polytetrafluoroethylene film or other low-friction coefficient insulating film, and is laminated to the outer surface of the thermally conductive insulating elastomer 30 by hot pressing or bonding. When the flexible insulating sleeve is inserted into the stator slot 102 along with the winding coil 20, the surface reinforcement layer 50 is in direct contact with the stator slot 102 wall, and its low friction characteristics facilitate installation and embedding. When the shape memory alloy plate 40 curls and causes the thermally conductive insulating elastomer 30 to contract inward, the low frictional resistance between the surface reinforcement layer 50 and the stator slot 102 wall ensures a smooth and unobstructed disengagement action.

[0030] like Figure 4 As shown, optionally, an adhesive layer 60 is provided on the inner surface of the thermally conductive insulating elastomer 30, and the adhesive layer 60 is bonded to the outer surface of the winding coil 20.

[0031] In this embodiment, the adhesive layer 60 is coated or laminated onto the inner surface of the thermally conductive insulating elastomer 30 facing the winding coil 20. The adhesive layer 60 uses a micro-adhesive formulation of thermally conductive silicone rubber or other highly thermally conductive adhesive materials, providing both adhesive bonding force and not hindering heat transfer from the winding coil 20 to the thermally conductive insulating elastomer 30. During assembly, the thermally conductive insulating elastomer 30 is bonded to the outer surface of the winding coil 20 via the adhesive layer 60, forming an integral structure with the flexible insulating sleeve and the winding coil 20, which are then inserted together into the stator slot 102. When the shape memory alloy plate 40 is wound, the contraction force is transferred to the winding coil 20 through the adhesive layer 60, causing the flexible insulating sleeve and the winding coil 20 to contract inward synchronously, preventing inner layer slippage.

[0032] like Figure 1 and Figure 2As shown, optionally, the stator core 10 includes a core body 101, and a plurality of stator slots 102 are spaced apart along the inner circumferential surface of the core body 101. Each stator slot 102 accommodates a set of winding coils 20 and a flexible insulating sleeve that wraps the winding coils 20.

[0033] In this embodiment, the stator core 10 includes a core body 101, which is cylindrical in shape, with multiple stator slots 102 evenly spaced along its inner circumferential surface. Each stator slot 102 penetrates the core body 101 axially. Each stator slot 102 houses a set of winding coils 20, and each set of winding coils 20 is wrapped with a flexible insulating sleeve formed by multiple thermally conductive and insulating elastomers 30 arranged and connected axially. Each thermally conductive and insulating elastomer 30 has a corresponding shape memory alloy plate 40 embedded within it. When a section of thermally conductive and insulating elastomer 30 in a specific stator slot 102 switches to thermal blocking protection mode due to local abnormal overheating of the corresponding winding coil 20, the sections of thermally conductive and insulating elastomers 30 in other stator slots 102 are completely unaffected by the abnormal operation within the slot and continue to maintain a close and efficient heat dissipation state.

[0034] like Figure 3 As shown, optionally, the thermally conductive insulating elastomer 30 is made of thermally conductive silicone rubber or thermally conductive polyurethane.

[0035] In this embodiment, the thermally conductive insulating elastomer 30 is made of thermally conductive silicone rubber or thermally conductive polyurethane. The thermally conductive silicone rubber or thermally conductive polyurethane matrix is ​​filled with thermally conductive filler. This material itself is elastic. Under normal operating conditions below the threshold temperature, the thermally conductive insulating elastomer 30 expands outwards when heated, filling the gap between the flexible insulating sleeve and the stator slot 102 wall, forming an efficient heat conduction path. Heat is transferred from the winding coil 20 to the stator core 10 via the thermally conductive insulating elastomer 30 itself.

[0036] like Figure 3 and Figure 4 As shown, optionally, two adjacent elastic body connecting portions 301 are fastened together, and two adjacent elastic body clamping portions 302 are slidably connected.

[0037] In this embodiment, multiple thermally conductive and insulating elastomers 30 are arranged sequentially along the axial direction. Adjacent thermally conductive and insulating elastomers 30 are connected in the following manner: the end faces of adjacent elastomer connecting portions 301 are fastened together by vulcanization bonding or integral molding, allowing each segment to be connected in series axially to form a single flexible insulating sleeve; the end faces of adjacent elastomer clamping portions 302 only make contact, allowing relative sliding at the interface. When the shape memory alloy plate 40 within a thermally conductive and insulating elastomer 30 curls due to temperature exceeding a threshold, the clamping portion 302 of that segment contracts inward, sliding smoothly relative to the clamping portions 302 of adjacent segments at the contact interface, unconstrained by adjacent segments; while the fastened connection of the elastomer connecting portions 301 maintains the axial continuity between segments, preventing the flexible insulating sleeve from breaking or separating as a whole.

[0038] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A high-efficiency heat dissipation structure for motor stator coils, characterized in that, include: Stator core (10), wherein the stator core (10) is provided with stator slots (102); Winding coil (20), the winding coil (20) is housed in the stator slot (102); Thermally conductive insulating elastomer (30), a plurality of the thermally conductive insulating elastomers (30) are arranged along the axial direction and connected to form a flexible insulating sleeve, the flexible insulating sleeve is wrapped around the outside of the winding coil (20) and inserted into the stator slot (102); Memory alloy plates (40), a plurality of memory alloy plates (40) are embedded in each of the thermally conductive and insulating elastomers (30) in a one-to-one correspondence; When the temperature is below the threshold temperature, the thermally conductive insulating elastomer (30) expands outward when heated, filling the gap between the flexible insulating sleeve and the stator slot (102) wall, forming a highly efficient heat dissipation mode that is close to the heat and conducts heat. When the temperature exceeds the threshold, the memory alloy plate (40) at the corresponding position curls up, causing the thermally conductive insulating elastomer (30) to contract inward, so that its outer surface separates from the groove wall of the stator groove (102) and forms an air gap, switching to the thermal blocking protection mode.

2. The high-efficiency heat dissipation structure for the motor stator coil according to claim 1, characterized in that, The thermally conductive and insulating elastomer (30) includes an elastomer connecting part (301), an elastomer clamping part (302), and an elastomer bending part (303). The two elastomer clamping parts (302) are symmetrically arranged at both ends of the elastomer connecting part (301), and the elastomer bending part (303) is fastened between the corresponding ends of the elastomer connecting part (301) and the elastomer clamping part (302).

3. The high-efficiency heat dissipation structure for the motor stator coil according to claim 2, characterized in that, The memory alloy plate (40) includes an alloy plate connecting part (401), an alloy plate clamping part (402), and an alloy plate bending part (403). Two alloy plate clamping parts (402) are symmetrically arranged at both ends of the alloy plate connecting part (401). The elastic bending part (303) is fastened between the ends of the corresponding alloy plate connecting part (401) and alloy plate clamping part (402).

4. The high-efficiency heat dissipation structure for the motor stator coil according to claim 1, characterized in that, The thermally conductive insulating elastomer (30) has a receiving groove (70) inside, which is used to fit and accommodate the shape memory alloy plate (40).

5. The high-efficiency heat dissipation structure for the motor stator coil according to claim 1, characterized in that, The outer surface of the thermally conductive insulating elastomer (30) is coated with a surface reinforcement layer (50), which is in contact with the groove wall of the stator groove (102).

6. The high-efficiency heat dissipation structure for the motor stator coil according to claim 1, characterized in that, The inner surface of the thermally conductive insulating elastomer (30) is provided with an adhesive layer (60), which is bonded to the outer surface of the winding coil (20).

7. The high-efficiency heat dissipation structure for the motor stator coil according to claim 1, characterized in that, The stator core (10) includes a core body (101), and a plurality of stator slots (102) are spaced apart along the inner circumferential surface of the core body (101). Each stator slot (102) contains a set of winding coils (20) and a flexible insulating sleeve that wraps the winding coils (20).

8. The high-efficiency heat dissipation structure for the motor stator coil according to claim 1, characterized in that, The thermally conductive insulating elastomer (30) is made of thermally conductive silicone rubber or thermally conductive polyurethane.

9. The high-efficiency heat dissipation structure for the motor stator coil according to claim 2, characterized in that, The two adjacent elastomer connecting parts (301) are fastened together, and the two adjacent elastomer clamping parts (302) are slidably connected.

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