Pressing nail and disc spring sleeve combined structure

Abstract

The utility model provides a pressing nail and disc spring sleeve combined structure which is used for connecting a clamping piece and a cushion block of a transformer, and belongs to the field of pressing nail structures of transformers. The pressing nail and disc spring sleeve combined structure comprises a bolt, a first nut, a sleeve, a gasket, a second nut and at least one disc spring, a mounting through hole is formed in the clamping piece, the sleeve penetrates through the mounting through hole in a sliding mode, and the bolt sequentially penetrates through the first nut, the sleeve, the gasket and the second nut and is connected with the cushion block in a pressing mode. The first nut and the second nut are in threaded fit with the bolt and fix the sleeve and the gasket to the bolt, the two ends of the sleeve are provided with axially-protruding limiting blocks respectively, the first nut and the gasket are provided with limiting grooves matched with the limiting blocks in an aligned mode respectively, the limiting blocks are inserted into the limiting grooves, the sleeve is sleeved with the belleville spring, and the belleville spring is sleeved with the belleville spring. The two ends of the belleville spring abut against the clamping piece and the gasket respectively. According to the structure, the anti-vibration capacity of the pressing nail is remarkably improved, it is ensured that pressing force is durable and stable, and the pressing nail deviation and loosening risks caused by vibration are reduced.

Description

Technical Field

[0001] This utility model relates to the pressure pin structure of a transformer, and particularly to a pressure pin disc spring sleeve combination structure. Background Technology

[0002] A transformer is a static electrical device that uses the principle of electromagnetic induction to transfer electrical energy. A transformer consists of a core, windings (coils), insulation and cooling systems, and accessories. During operation, a transformer constantly vibrates, and this vibration can lead to long-term fatigue of the core and windings, causing damage to its mechanical properties and loosening of structural components.

[0003] Transformer vibration is mainly caused by the following reasons: 1. The winding is subjected to electromagnetic force when energized, resulting in winding vibration; 2. The core vibration is caused by magnetostrictive deformation of the silicon steel sheets and insufficient clamping force; 3. Vibration caused by the operation of the fan.

[0004] Currently, winding vibration is suppressed by pressing the upper pad against the winding. The clamping force of the upper pad is generally achieved by locking the upper pad with a square-headed flat-end set screw, washer, and nut on the upper clamp.

[0005] The aforementioned clamping structure is highly sensitive to external forces, especially during transformer operation when vibrations or impacts occur. The bolts are prone to loosening, leading to a decrease in clamping force. Simultaneously, the flat washer may undergo plastic deformation under significant stress, particularly when the nut tightening torque is excessive. This can cause the flat washer to lose its elasticity, resulting in unstable clamping force. Furthermore, the existing bolt, flat washer, and nut structure lacks elastic buffering capacity, failing to effectively absorb or mitigate vibrations generated during transformer operation. This may increase the impact force between the pad and the base, affecting equipment stability.

[0006] In view of this, based on years of experience in production and design in this and related fields, the inventor has designed a combination structure of pressure nail disc spring sleeve through repeated experiments in order to solve the problems existing in the prior art. Utility Model Content

[0007] The purpose of this invention is to provide a combined structure of a pressure nail disc spring sleeve, which can effectively increase the vibration resistance of the pressure nail structure.

[0008] To achieve the above objectives, this utility model proposes a combined structure of a pressure-pin disc spring sleeve, wherein the combined structure includes a bolt, a first nut, a sleeve, a washer, a second nut, and at least one disc spring. A mounting through hole is provided on the clamping member, and the sleeve slides through the mounting through hole. The bolt sequentially passes through the first nut, sleeve, washer, and second nut and presses against a pad. The first nut and second nut are threadedly engaged with the bolt and fix the sleeve and washer to the bolt. Axially protruding limiting blocks are provided at both ends of the sleeve. Limiting grooves that align with the limiting blocks are provided on the first nut and the washer, respectively. The limiting blocks are inserted into the limiting grooves. The disc spring is sleeved outside the sleeve, and both ends of the disc spring abut against the clamping member and the washer, respectively.

[0009] In the aforementioned press-fit disc spring sleeve assembly structure, two limiting blocks are symmetrically arranged at each end of the sleeve.

[0010] In the aforementioned combination structure of the pressure pin disc spring sleeve, two limiting grooves are provided on the end face of the first nut facing the sleeve, and the two limiting grooves are arranged symmetrically.

[0011] In the aforementioned press-fit disc spring sleeve assembly structure, two limiting grooves are provided on the end face of the washer facing the sleeve, and the two limiting grooves are arranged symmetrically.

[0012] In the aforementioned press-fit disc spring sleeve assembly structure, the outer wall of the sleeve is covered with a damping fiber layer.

[0013] In the aforementioned pressure-pin disc spring sleeve assembly structure, a spiral groove is provided on the outer wall of the sleeve, and the damping fiber layer has a spiral protrusion embedded in the spiral groove.

[0014] In the aforementioned combination structure of the pressure-pin disc spring sleeve, the thickness of the second nut is greater than the thickness of the first nut.

[0015] In the aforementioned combination structure of the pressure-pin disc spring sleeve, mounting grooves are symmetrically provided on both sides of the end of the sleeve facing the first nut.

[0016] As described above, in the combined structure of the pressure pin disc spring sleeve, the sleeve outer sleeve is provided with multiple disc springs, which are arranged sequentially along the axial direction of the sleeve.

[0017] In the above-described press-fit disc spring sleeve assembly structure, a receiving groove is provided on the pad, a pad plate is provided in the receiving groove, and the bolt is pressed onto the pad plate.

[0018] Compared with the prior art, the present invention has the following features and advantages:

[0019] This utility model proposes a combined structure of a pressure nail disc spring sleeve, which absorbs vibration energy and dynamically compensates for pressure force fluctuations through a disc spring. The longitudinal support and lateral limiting design of the sleeve eliminates pressure nail offset, and the mechanical interlocking mechanism of the washer and the first nut and the second nut prevents bolt loosening, forming a multi-stage vibration reduction system. This effectively improves the vibration resistance of the pressure nail structure, ensures that the pressure force remains stable in a vibration environment, reduces winding displacement and equipment fatigue damage, and reduces maintenance requirements. It is especially suitable for vibration-sensitive transformer scenarios such as engine room transformers. Attached Figure Description

[0020] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, under the guidance of this invention, can select various possible shapes and proportions to implement this invention according to specific circumstances.

[0021] Figure 1 This is a schematic diagram of the installation of the pressure nail disc spring sleeve combination structure proposed in this utility model;

[0022] Figure 2 This is a schematic diagram of the combined structure of the pressure nail disc spring sleeve in this utility model;

[0023] Figure 3 This is a front view of the combined structure of the pressure nail disc spring sleeve in this utility model;

[0024] Figure 4 This is a side view of the combined structure of the pressure nail disc spring sleeve in this utility model;

[0025] Figure 5 This is a schematic diagram of the washer of this utility model;

[0026] Figure 6 This is a schematic diagram of the sleeve of this utility model;

[0027] Figure 7 This is a top view of the sleeve of this utility model;

[0028] Figure 8 This is a schematic diagram of the first nut of this utility model.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Clamping parts; 2. Bolts;

[0031] 3. First nut; 4. Sleeve;

[0032] 5. Washer; 6. Second nut;

[0033] 7. Disc spring; 8. Spacer block;

[0034] 9. Limiting block; 10. Limiting groove;

[0035] 11. Backing plate; 12. Mounting groove;

[0036] 13. Receiving slot; 14. Coil. Detailed Implementation

[0037] The details of this utility model can be more clearly understood by referring to the accompanying drawings and the description of specific embodiments. However, the specific embodiments of this utility model described herein are for illustrative purposes only and should not be construed as limiting the utility model in any way. Under the teachings of this utility model, those skilled in the art can conceive of any possible modifications based on this utility model, and these should all be considered to fall within the scope of this utility model.

[0038] like Figures 1 to 8 As shown, this utility model proposes a combined structure of a press-fit disc spring sleeve, which includes a bolt 2, a first nut 3, a sleeve 4, a washer 5, a second nut 6, and at least one disc spring 7. The clamp 1 has an installation through hole, through which the sleeve 4 slides. The bolt 2 passes through the first nut 3, sleeve 4, washer 5, and second nut 6 in sequence and is pressed against a pad 8. The first nut 3 and second nut 6 are threaded with the bolt 2 and fix the sleeve 4 and washer 5 to the bolt 2. The sleeve 4 has axially protruding limiting blocks 9 at both ends. The first nut 3 and washer 5 have limiting grooves 10 that align with the limiting blocks 9. The limiting blocks 9 are inserted into the limiting grooves 10. The disc spring 7 is sleeved on the sleeve 4, and its two ends abut against the clamp 1 and washer 5, respectively.

[0039] The proposed combination structure of the pressure nail disc spring sleeve effectively limits the lateral and longitudinal displacement of the sleeve 4 and enhances the overall stability of the pressure nail structure through the sliding fit between the sleeve 4 and the clamp 1, and the insertion design of the limiting blocks 9 at both ends of the sleeve 4 with the limiting grooves 10 on the first nut 3 and the limiting grooves 10 on the washer 5. At the same time, the elastic deformation of the disc spring 7 absorbs vibration energy and dynamically compensates for the fluctuation of the clamping force, reducing the transmission of vibration to the bolt 2. The first nut 3 and the second nut 6 fix the sleeve 4 and the washer 5 through the threaded fit, and the mechanical interlocking mechanism of the limiting blocks 9 and the limiting grooves 10 prevents the bolt 2 from loosening under vibration.

[0040] The combined structure of the pressure nail disc spring sleeve proposed in this utility model can significantly improve the vibration resistance of the bolt 2, ensure the long-term stability of the clamping force, and reduce the risk of bolt 2 displacement, loosening and fatigue damage caused by vibration.

[0041] In one optional embodiment of this utility model, two limiting blocks 9 are provided axially symmetrically at each end of the sleeve 4. The limiting block 9 at the lower end of the sleeve 4 is inserted into the limiting groove 10 on the washer 5, and the limiting block 9 at the upper end of the sleeve 4 is inserted into the opening of the first nut 3, forming a bidirectional mechanical locking.

[0042] In an optional embodiment of this utility model, the sleeve 4 passes through the mounting through hole of the clamp 1, and its outer diameter is clearance-fitted with the opening of the clamp 1 to restrict lateral displacement.

[0043] In one optional example, the outer diameter of sleeve 4 is 1 mm smaller than the inner diameter of the mounting through hole.

[0044] In one alternative embodiment, two limiting grooves 10 are provided on the end face of the first nut 3 facing the sleeve 4. The two limiting grooves 10 are symmetrically arranged. The relative rotation and longitudinal displacement between the sleeve 4 and the first nut 3 are restricted by the rigid interlocking of the symmetrically distributed limiting grooves 10 and the limiting block 9.

[0045] Furthermore, the first nut 3 is threaded and engages with the bolt 2. When tightened downwards, it compresses the disc spring 7 and simultaneously forms a mechanical constraint with the limiting block 9 of the sleeve 4 through the limiting groove 10, ensuring the axial alignment of the sleeve 4 and the first nut 3.

[0046] In one optional embodiment of this implementation, two limiting grooves 10 are formed on the end face of the washer 5 facing the sleeve 4, and the two limiting grooves 10 are arranged symmetrically. The washer 5 is rigidly connected to the limiting block 9 of the sleeve 4 through the limiting grooves 10, which restricts the lateral and longitudinal displacement between the sleeve 4 and the washer 5. Through the mechanical interlocking of the symmetrically distributed limiting grooves 10 and the limiting block 9, the axial alignment of the sleeve 4 and the washer 5 is ensured, and the bolt 2 is prevented from shifting during vibration.

[0047] In one alternative embodiment, the lines connecting the two limiting blocks 9 at the end of the sleeve 4 facing the first nut 3 and the lines connecting the two limiting blocks 9 at the end of the sleeve 4 facing the washer 5 are projected onto the cross-section of the sleeve 4, thereby ensuring that the forces at both ends of the sleeve 4 are symmetrical.

[0048] In one alternative embodiment, the projections of the lines connecting the two limiting blocks 9 at the end of the sleeve 4 facing the first nut 3 and the two limiting blocks 9 at the end of the sleeve 4 facing the washer 5 onto the cross-section of the sleeve 4 have an angle, so that the limiting blocks 9 at both ends of the sleeve 4 need to be aligned at a specific angle during installation, ensuring rotational constraint between the sleeve 4 and the first nut 3 and the washer 5, and enhancing the stability of the mechanical interlock.

[0049] In one optional embodiment of this invention, the outer wall of the sleeve 4 is covered with a damping fiber layer. The damping fiber layer can effectively suppress the transmission of high-frequency vibrations between the clamp 1 and the sleeve 4.

[0050] In an optional example of this embodiment, the damping fiber layer is an aramid fiber layer, which has high damping properties and a better suppression effect on high-frequency vibration transmission.

[0051] In an optional embodiment, a spiral groove is provided on the outer wall of the sleeve 4, and the damping fiber layer has a spiral protrusion embedded in the spiral groove to increase the contact area between the damping fiber layer and the outer wall of the sleeve 4 and improve the connection strength between the damping fiber layer and the sleeve 4.

[0052] In an optional example, the damping fiber layer is formed by a damping fiber tape. The damping fiber tape is pre-impregnated with epoxy resin and wound along a spiral groove. It is then heated and cured so that the resin fills the groove gaps. The damping fiber tape forms a damping fiber layer on the outer wall of the sleeve 4. Finally, the surface of the damping fiber layer is polished.

[0053] In one optional example, the damping fiber tape is an aramid fiber tape.

[0054] In one optional embodiment of this utility model, the thickness of the second nut 6 is greater than the thickness of the first nut 3. The thickness design of the second nut 6 enhances its thread engagement length, increases the axial locking force, and ensures the stability of the compression of the disc spring 7; the thin design of the first nut 3 facilitates its insertion and engagement with the upper limit block 9 of the sleeve 4, while reducing the overall structural height.

[0055] In an optional embodiment of this utility model, mounting grooves 12 are symmetrically provided on both sides of the end of the sleeve 4 facing the first nut 3. By inserting the claw of the wrench into the mounting groove 12, a rotational torque can be applied to the sleeve 4 to assist in tightening or loosening the sleeve 4.

[0056] In an optional example of this implementation, a torque wrench is used to ensure the tightening force between the sleeve 4 and the first nut 3 and the second nut 6, and to ensure the tightening force of the pressure nail disc spring sleeve combination structure.

[0057] Furthermore, the symmetrically arranged mounting grooves 12 ensure that the sleeve 4 is subjected to uniform force, avoid stress concentration on one side, and constrain the relative position of the sleeve 4 and the wrench to prevent the tool from slipping during operation.

[0058] In one optional embodiment of this utility model, a plurality of butterfly springs 7 are fitted around the sleeve 4, and the butterfly springs 7 are arranged sequentially along the axial direction of the sleeve 4. After the sleeve 4 passes through the mounting through hole of the clamp 1, the upper end of the butterfly spring 7 abuts against the lower surface of the clamp 1, and the lower end abuts against the washer 5; when the bolt 2 passes through the sleeve 4 and is tightened by the first nut 3, the butterfly spring 7 is compressed to provide elastic preload. The superimposed design of the plurality of butterfly springs 7 absorbs vibration energy of different intensities through graded deformation, while the axial sequential arrangement ensures uniform force transmission.

[0059] In an optional embodiment of this utility model, a receiving groove 13 is provided on the pad 8, and a pad plate is provided in the receiving groove 13. The bolt 2 is pressed onto the pad plate 11. The surface of the pad plate 11 contacts the end of the bolt 2 to disperse the clamping force and avoid the bolt 2 directly pressing onto the pad 8, which would cause local stress concentration. The depth of the receiving groove 13 matches the thickness of the pad plate 11 to ensure that the surface of the pad plate 11 is flush with the surface of the pad 8, maintaining the flatness of the structure. The clamping force of the bolt 2 is evenly transmitted to the pad 8 through the pad plate 11, reducing the risk of deformation of the pad 8 due to uneven force, thereby reducing the vibration of the coil 14.

[0060] The detailed explanations of the above embodiments are intended only to explain the present invention so as to facilitate a better understanding of the present invention. However, these descriptions should not be construed as limiting the present invention for any reason. In particular, the various features described in different embodiments can be arbitrarily combined with each other to form other embodiments. Unless there is an explicit description to the contrary, these features should be understood to be applicable to any embodiment, and not limited to the described embodiments.

Claims

1. A combination structure of a pressure-pin disc spring sleeve for connecting the clamp and the pad of a transformer, characterized in that, The press-fit disc spring sleeve assembly structure includes a bolt, a first nut, a sleeve, a washer, a second nut, and at least one disc spring. The clamp has a mounting through hole, through which the sleeve slides. The bolt passes through the first nut, the sleeve, the washer, and the second nut in sequence and is pressed against the pad. The first nut and the second nut are threaded into the bolt and fix the sleeve and the washer to the bolt. The sleeve has axially protruding limiting blocks at both ends. The first nut and the washer have limiting grooves that align with the limiting blocks. The limiting blocks are inserted into the limiting grooves. The disc spring is sleeved outside the sleeve, and its two ends abut against the clamp and the washer, respectively.

2. The pressure-pin disc spring sleeve combined structure as described in claim 1, characterized in that, Two limiting blocks are provided axially symmetrically at each end of the sleeve.

3. The pressure-pin disc spring sleeve combination structure as described in claim 2, characterized in that, The first nut has two limiting grooves on its end face facing the sleeve, and the two limiting grooves are arranged symmetrically.

4. The combined structure of the pressure nail disc spring sleeve as described in claim 2, characterized in that, The washer has two limiting grooves on its end face facing the sleeve, and the two limiting grooves are arranged symmetrically.

5. The pressure-pin disc spring sleeve combination structure as described in claim 1, characterized in that, The outer wall of the sleeve is covered with a damping fiber layer.

6. The combined structure of the pressure-pin disc spring sleeve as described in claim 5, characterized in that, The outer wall of the sleeve is provided with a spiral groove, and the damping fiber layer has a spiral protrusion that is embedded in the spiral groove.

7. The combined structure of the pressure nail disc spring sleeve as described in claim 1, characterized in that, The thickness of the second nut is greater than the thickness of the first nut.

8. The combined structure of the pressure-pin disc spring sleeve as described in claim 1, characterized in that, The sleeve has symmetrical mounting grooves on both sides of the end facing the first nut.

9. The pressure-pin disc spring sleeve combination structure as described in claim 1, characterized in that, The sleeve is fitted with a plurality of butterfly springs, which are arranged sequentially along the axial direction of the sleeve.

10. The combined structure of the pressure nail disc spring sleeve as described in claim 1, characterized in that, The pad has a receiving groove, and a pad plate is provided in the receiving groove. The bolt is pressed onto the pad plate.

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