CN206250032U - Dry-type transformer and its cushion block compressing structure - Google Patents

Abstract

The utility model provides a dry-type transformer and its cushion block compression structure. The cushion block compression structure includes compression bolts and cushion blocks arranged along the up and down directions. Groove, the disc spring group is set on the compression bolt, the disc spring at the bottom of the disc spring group is press-fitted with the pad, and the compression nut is screwed on the compression bolt above the disc spring group. The uppermost disc spring in the spring group is press-fitted with the compression nut, and the compression bolt is sleeved with a guide sleeve in the inner hole of the disc spring group. The beneficial effect of the utility model is that: the existence of the guide sleeve can reduce the gap between the compression bolt and the inner hole of the disc spring group, so that when the transformer generates a large vibration during transportation and operation, the disc spring group The lateral movement of the disc spring can be significantly reduced, thereby avoiding the lateral dislocation of the disc spring, ensuring the use effect of the disc spring, and finally ensuring the compression effect of the pad compression structure and the normal and safe use of the transformer.

Description

Dry-type transformer and its pad compression structure

technical field

The utility model relates to a dry-type transformer and a pad pressing structure thereof.

Background technique

The block compression structure for dry-type transformers is a key structure used to support and compress the high and low voltage windings of the transformer. Usually, it adopts the combination of nails, disc springs and spacers. The authorized announcement number is CN201788796U, and the authorized announcement date is The Chinese utility model patent of 2011.04.06 discloses a three-phase five-column dry-type transformer, including upper and lower clamps, elastic pressure nails are installed on the outer edges of the upper and lower clamps, and the upper and lower ends of the high-voltage winding and low-voltage winding , and the lower ends are equipped with resin pads, the elastic nails press and fix the resin pads and the high and low voltage windings, and the joints of the elastic nails and the resin pads are provided with disc springs, which can absorb the vibration of the transformer when it is working. Vibration, so as to prevent the loosening of the elastic nail and the resin spacer.

The above-mentioned elastic clamping nail is essentially a clamping bolt. The resin spacer is provided with a groove for the bolt head of the clamping bolt to be embedded. The upper surface of the resin pad is press-fitted, and the disc spring on the top is press-fitted with the compression nut screwed on the compression bolt, and the disc spring is compressed on the surface of the resin pad by the action of the compression nut.

Although this block compression structure can compress the high and low voltage windings and increase the anti-seismic performance of the iron core, the vibration of the transformer during transportation and operation is relatively large, and due to the specifications of the transformer, the specifications of the pads and the pressure Due to the limitation of tightening bolt specifications, the diameter of the stem of the pressing bolt is much smaller than the diameter of the inner hole of the disc spring. Therefore, with the occurrence of vibration and the floating of the disc spring, there may be a gap between different disc springs due to excessive lateral displacement. Misalignment occurs. As we all know, the most commonly used method of disc springs in application is two pairs. Once the dislocation occurs between the disc springs, its use effect will be greatly damaged, and the compression effect of the pad will be greatly reduced. The pads cannot press the high-voltage winding and the low-voltage winding tightly, and the high-voltage winding and the low-voltage winding will move horizontally and vertically. If it is serious, it may cause a fault and affect normal use.

In addition, in the block compression structure in the prior art, the compression force of the disc spring is controlled by the compression nut, and the compression nut is more compressed than the pressure, which depends entirely on the experience of the operator. The demand for pressing force is different, and there is no clear standard for pressing. Less pressing will lead to insufficient pressing force, which will cause the high-voltage winding and low-voltage winding to move. Too much pressing may damage the parts of the transformer, or even This causes the disc spring to deform excessively and fail, which brings great inconvenience to the assembly and use of the transformer.

Utility model content

The purpose of this utility model is to provide a pad pressing structure to solve the problem that disc springs in the prior art are prone to excessive lateral displacement and cause misalignment; the purpose of this utility model is also to provide a Dry-type transformer in compact structure.

In order to solve the problems of the technologies described above, the technical scheme of the pad compression structure in the utility model is:

A cushion block compression structure, including compression bolts and cushion blocks arranged in the up and down direction, the cushion block is provided with grooves for the bolt heads of the compression bolts to be embedded, the compression bolts are sleeved with disc spring groups, and the disc springs The lowermost disc spring in the spring group is press-fitted with the pad, the compression bolt is screwed with a compression nut above the disc spring group, and the uppermost disc spring in the disc spring group is pressed against the compression nut. press-fitting, a guide sleeve is sheathed in the inner hole of the disc spring set on the pressing bolt.

The wall thickness of the guide sleeve is equal to the gap between the compression bolt and the inner hole of the disc spring.

The height of the guide sleeve satisfies the pressure fit between the bottom end of the guide sleeve and the top of the bolt head, and the press fit between the top end of the guide sleeve and the compression nut when the disc spring group reaches the set deformation degree.

The pad pressing structure also includes an elastic insulating pad arranged under the pad for contacting the high-voltage winding and the low-voltage winding. The upper surface of the elastic insulating pad is provided with a strip-shaped bump, and the bottom of the pad is provided with a A bar-shaped groove with a concave-convex fit with a convex block.

The strip-shaped groove runs through the bottom of the spacer, the length of the strip-shaped protrusion is shorter than the length of the strip-shaped groove, and the elastic insulating pad is provided with a gap between the high-voltage winding and the low-voltage winding directly below the strip-shaped groove. The relief opening of the insulating support block.

Both the strip-shaped protrusion and the strip-shaped groove are arranged on the center line of the surface where they are located, and the extension direction of the strip-shaped protrusion and the relief opening is consistent with the length direction of the elastic insulating pad.

The technical scheme of the dry-type transformer in the utility model is:

A dry-type transformer, including an iron core and a low-voltage winding and a high-voltage winding arranged on the periphery of the iron core in sequence, an upper clamp is fixed on the part of the iron core that is higher than the low-voltage winding and the high-voltage winding, and a fixed clamp is fixed on the upper clamp. Nuts, above the low-voltage winding and high-voltage winding, there is a spacer compression structure, the spacer compression structure includes compression bolts and spacers arranged in the up and down direction, and the spacers are provided with bolt heads for the compression bolts to embed The threaded section at the other end of the compression bolt is threadedly connected with the fixed nut, and the disc spring group is set on the compression bolt, and the disc spring at the bottom of the disc spring group is press-fitted with the pad. A compression nut is screwed on the tightening bolt above the disc spring group, and the uppermost disc spring in the disc spring group is press-fitted with the compression nut, and the compression bolt is set in the inner hole of the disc spring group. With guide sleeve.

The wall thickness of the guide sleeve is equal to the gap between the compression bolt and the inner hole of the disc spring.

The height of the guide sleeve satisfies the pressure fit between the bottom end of the guide sleeve and the top of the bolt head, and the press fit between the top end of the guide sleeve and the compression nut when the disc spring group reaches the set deformation degree.

The pad pressing structure also includes an elastic insulating pad which is arranged under the pad and is in contact with the high-voltage winding and the low-voltage winding. The upper surface of the elastic insulating pad is provided with a bar-shaped bump, and the bottom of the pad is provided with a The strip-shaped grooves are matched with concave-convex of the shaped bumps, and the strip-shaped grooves run through the bottom of the pad. The length of the strip-shaped bumps is shorter than the length of the strip-shaped grooves. It is used to make way for the opening of the insulating support between the high-voltage winding and the low-voltage winding.

Both the strip-shaped protrusion and the strip-shaped groove are arranged on the center line of the surface where they are located, and the extension direction of the strip-shaped protrusion and the relief opening is consistent with the length direction of the elastic insulating pad.

The beneficial effect of the utility model is that a guide sleeve is sleeved in the inner hole of the disc spring group on the compression bolt, and the existence of the guide sleeve can reduce the gap between the compression bolt and the inner hole of the disc spring group, so that when the transformer When there is a large vibration during transportation and operation, the lateral movement of the disc springs in the disc spring group can be significantly reduced, thereby avoiding the lateral misalignment of the disc springs, ensuring the use of the disc springs, and finally ensuring the pad The compression effect of the compression structure and the normal and safe use of the transformer.

Description of drawings

Fig. 1 is a partial structural schematic diagram of an embodiment of a dry-type transformer in the utility model;

Fig. 2 is a schematic structural view of the elastic pressing nail in Fig. 1;

Fig. 3 is a schematic diagram of the explosive structure of the elastic pressing nail;

Fig. 4 is the structural representation of pad among Fig. 1;

FIG. 5 is a schematic structural diagram of the insulating silicone pad in FIG. 1 .

In the figure: 1. Elastic nail; 2. Pad; 3. Insulating silicone pad; 4. High voltage winding; 5. Low voltage winding; 6. Fixing nut; 7. Upper clamp; 8. Iron core; 11. Compress Bolt; 12. Compression nut; 13. Disc spring; 14. Guide sleeve; 21. Groove; 22. Strip groove; 31. Strip bump; 32. Give way.

detailed description

An embodiment of a dry-type transformer is shown in Figures 1 to 5, including an iron core 8 and a low-voltage winding 5 and a high-voltage winding 4 arranged in sequence on the periphery of the iron core 8, and the iron core 8 is higher than the low-voltage winding 5 and the high-voltage winding 4. The part is fixedly provided with upper clamping part 7, and the side of upper clamping part 7 is fixedly provided with fixing nut 6, and specifically described fixing nut 6 is a hexagonal nut, and one of the sides in the hexagonal surface of the hexagonal nut is connected with the upper clamping part 7 welding fixed.

Above the low-voltage winding 5 and the high-voltage winding 4, a pad pressing structure is provided, and the pad pressing structure includes elastic nails 1, pads 2 and insulating silicone pads 3 arranged in sequence along the up and down direction, wherein the elastic pressing The nail 1 includes a compression bolt 11 , a guide sleeve 14 sleeved on the compression bolt 11 , a disc spring set 13 sleeved outside the guide sleeve 14 and a compression nut 12 screwed on the compression bolt 11 . The wall thickness of guide sleeve 14 is just equal to the gap between the inner hole of hold-down bolt 11 and disc spring group 13, that is to say, after disc spring group 13 is set on the hold-down bolt, the disc spring in disc spring group 13 The sheet will not move horizontally, which ensures the use effect of the disc spring.

The threaded section at one end of the hold-down bolt 11 is threadedly connected with the fixing nut 6, and a circular groove 21 is provided on the top surface of the spacer 2, and the bolt head at the other end of the hold-down bolt 11 is inserted into the groove. slot 21. The lowermost disc spring in the disc spring group 13 is press-fitted with the top surface of the block 2, and the compression nut 12 moves downward to compress the disc spring group 13, and the uppermost disc spring in the disc spring group 13 and the compression nut 12 Press fit on the bottom surface.

The disc spring group 13 has a total of 13 disc springs. When the 13 disc springs are compressed to the set degree of deformation by the compression nut 12, the bottom end of the guide sleeve 14 is just press-fitted with the top of the bolt head, and the guide sleeve 14 The top end just presses fit with compression nut 12. That is to say, the function of the guide sleeve 14 is not only to satisfy the guidance to the disc spring group 13 and to prevent the disc springs from moving laterally, but also to act as a compression standard. When the end faces of the sleeve 14 are in contact, the disc spring group 13 can no longer be compressed, thereby giving a definite assembly criterion. Through the design calculation in advance, the deformation of the disc spring group can be calculated according to the disc spring pressing force that needs to be obtained, and then according to the number of disc springs in the disc spring group, a guide sleeve with a certain height can be configured, so that When the disc spring group reaches the set degree of deformation, the compression nut just touches the guide sleeve.

Different transformers and different pad pressing structures have different specifications of disc spring sets and guide sleeves, but in the end they are all to obtain the most suitable pressing force, and the control of pressing force no longer depends on the operator's control. According to experience, each block compression structure has a clear compression standard, and the compression force is not too much, which solves the problem that the high-voltage winding and low-voltage winding are easy to move when the compression force is too small, and the transformer when the compression force is too large The parts are easily crushed and the disc spring fails.

The bottom surface of the insulating silicone pad 3 is in contact with the low-voltage winding 5 and the high-voltage winding 4, the upper surface of the insulating silicone pad 3 is provided with a strip-shaped bump 31, and the bottom surface of the pad 2 is provided with a strip-shaped bump that matches the strip-shaped bump 31 The groove 22 and the strip-shaped groove 22 run through the bottom surface of the spacer 2 , and the length of the strip-shaped protrusion 31 is shorter than the length of the strip-shaped groove 22 . The extension direction of the strip-shaped protrusion 31 and the strip-shaped groove 22 is consistent with the length extension direction of the insulating silicone pad 3 and the pad 2 respectively, and both point to the winding center of the high-voltage winding 4 or the low-voltage winding 5 .

The strip-shaped protrusion 31 and the strip-shaped groove 22 are respectively located on the midline of the width direction of the insulating silica gel pad 3 and the spacer 2, wherein the strip-shaped protrusion 31 is located at one end of the insulating silica gel pad 3, on the insulating silica gel pad 3 The other end of the bar-shaped protrusion 31 is provided with the same width as the bar-shaped protrusion 31 and is centered with the remaining groove part of the bar-shaped groove 22 after the bar-shaped protrusion 31 is concave-convexly matched with the bar-shaped groove 22. The relief opening 32 , that is to say, the relief opening 32 is located directly below the bar-shaped groove 22 .

An insulating support block (not shown in the figure) is provided between the high-voltage winding 4 and the low-voltage winding 5 , and the insulating support block passes through the relief opening 32 and the remaining groove part of the bar-shaped groove 22 .

The spacer 2 is pressed and formed by DMC material, and the width and depth of the strip groove 22 are both 10mm. When the specifications of the transformer are different, only the length a, width b, height c and circular groove of the spacer 2 need to be changed The size of 21 diameter d is sufficient. The insulating silicone pad 3 has elasticity. When the heights of the high-voltage winding 4 and the low-voltage winding 5 are inconsistent, the elastic deformation of the insulating silicone pad 3 can be adjusted to make the height consistent, so that the pressing plane of the disc spring group 13 is the pad 2. The upper surface is in a horizontal state to ensure a good compaction effect. In addition, through the elastic deformation of the insulating silicone pad 3, it can also play a certain buffering effect on the up and down vibration of the transformer.

When in use, first place the insulating silicone pad 3 on the top of the high-voltage winding 4 and the low-voltage winding 5, and then place the pad 2 on the top of the insulating silicone pad 3, so that the insulating silicone pad 3 and the pad 2 are concave-convex. The support block just passes through the relief opening 32 and the remaining groove portion of the strip groove 22 . Then the threaded section at one end of the elastic pressure nail is threaded with the fixing nut 6, and the compression bolt 11 is slowly screwed down until the bolt head of the compression bolt 11 is embedded in the circular groove 21, and then the compression nut 12 is turned downward , so that the compression nut 12 compresses the disc spring group 13, and the disc springs in the disc spring group 13 guide and move downward under the action of the guide sleeve 14. When the compression nut 12 touches the guide sleeve 14, the disc spring group 13 When the set degree of deformation is reached, the bottom disc spring in the disc spring group 13 is pressed against the upper surface of the cushion block 2, giving the cushion block 2 a constant pressure.

Elastic pressing nails are used, which have good elasticity and high strength, and give a constant pressure to the high-voltage winding 4 and low-voltage winding 5, so that the high-voltage winding 4 and low-voltage winding 5 do not move up and down and forward and backward during the transportation and operation of the transformer, ensuring the transformer The iron core 8 is fastened into a whole with the high voltage winding 4 and the low voltage winding 5.

When the size and capacity of the high-voltage and low-voltage windings of the transformer change, it is necessary to use different elastic nails, pads and insulating silicone pads to ensure the compression effect. The size of the high and low voltage windings is designed, and the specifications and sizes of the elastic pressure nails are selected according to the size of the spacer. Therefore, it is difficult to ensure that the selected pressure bolts just match the inner holes of the disc springs. There must be a certain gap between them, and the existence of the guide sleeve just fills up this gap, so that during the use of the pad compression structure, the disc spring group will not move laterally, ensuring the compression effect.

In other embodiments of the dry-type transformer: the material of the spacer can also be resin; the elastic insulating pad can also be made of rubber; The length of the strip-shaped groove is the same, at this time, the insulating support block can be arranged in other parts between the high-voltage and low-voltage windings; center, but there is a certain deflection; when the disc spring group reaches the set deformation degree, the height of the guide sleeve can also be slightly lower than the height of the disc spring group; the wall thickness of the guide sleeve can also be different from the compression bolt and the disc spring The gap between the inner holes of the , but slightly smaller than the gap.

The embodiment of the block pressing structure is shown in Fig. 1 to Fig. 5. The specific structure of the block pressing structure is the same as the block pressing structure described in the above dry-type transformer embodiment, and will not be described in detail here.

Claims (10)

1. A pad compression structure, including a compression bolt and a pad arranged in the up and down direction, the pad is provided with a groove for the bolt head of the compression bolt to embed, and the compression bolt is sleeved with a disc spring assembly , the lowermost disc spring in the disc spring group is press-fitted with the pad, the compression bolt is screwed with a compression nut above the disc spring group, and the uppermost disc spring in the disc spring group is in contact with the compression The nut is press-fitted, and it is characterized in that a guide sleeve is sheathed on the pressing bolt in the inner hole of the disc spring group. 2. The pad pressing structure according to claim 1, characterized in that: the wall thickness of the guide sleeve is equal to the gap between the pressing bolt and the inner hole of the disc spring. 3. The pad pressing structure according to claim 1 or 2, characterized in that: the height of the guide sleeve meets the pressure fit between the bottom end of the guide sleeve and the bolt head when the disc spring group reaches the set deformation degree 1. The top end of the guide sleeve is press-fitted with the compression nut. 4. The pad pressing structure according to claim 3, characterized in that: the pad pressing structure also includes an elastic insulating pad arranged under the pad for contacting the high-voltage winding and the low-voltage winding, the elastic insulating pad The upper surface is provided with a strip-shaped protrusion, and the bottom of the spacer is provided with a strip-shaped groove matching with the strip-shaped protrusion. 5. The pad pressing structure according to claim 4, characterized in that: the strip-shaped groove runs through the bottom of the pad, the length of the strip-shaped protrusion is shorter than the length of the strip-shaped groove, and the elastic insulating pad is placed on the strip There is a relief opening for the insulation support block between the high-voltage winding and the low-voltage winding just below the groove. 6. The pad pressing structure according to claim 5, characterized in that: the strip-shaped protrusion and the strip-shaped groove are all arranged on the center line of the surface where they are located, and the strip-shaped protrusion and the relief opening The extending direction is consistent with the length direction of the elastic insulating pad. 7. A dry-type transformer, including an iron core and a low-voltage winding and a high-voltage winding arranged on the periphery of the iron core in sequence, and an upper clamp is fixed on the part of the iron core that is higher than the low-voltage winding and the high-voltage winding, and the upper clamp is fixed on the upper clamp. There are fixed nuts, and a pad compression structure is arranged above the low-voltage winding and high-voltage winding. The pad compression structure includes compression bolts and pads arranged along the up and down directions, and bolts for the compression bolts are provided on the pads. The groove embedded in the head, the threaded section at the other end of the compression bolt is threadedly connected with the fixed nut, and the disc spring group is set on the compression bolt, and the disc spring at the bottom of the disc spring group is press-fitted with the pad , the compression bolt is screwed with a compression nut above the disc spring group, and the uppermost disc spring in the disc spring group is press-fitted with the compression nut. It is characterized in that: the compression bolt is mounted on the disc spring A guide sleeve is sleeved in the inner hole of the group. 8. The dry-type transformer according to claim 7, characterized in that: the wall thickness of the guide sleeve is equal to the gap between the pressing bolt and the inner hole of the disc spring. 9. The dry-type transformer according to claim 7 or 8, characterized in that: the height of the guide sleeve satisfies the pressure fit between the bottom end of the guide sleeve and the top of the bolt head when the disc spring group reaches the set deformation degree, and guides The top of the sleeve is pressure-fitted with the compression nut. 10. The dry-type transformer according to claim 9, characterized in that: the block pressing structure also includes an elastic insulating pad arranged under the pad and in contact with the high-voltage winding and the low-voltage winding, and the upper surface of the elastic insulating pad is A bar-shaped bump is provided, and the bottom of the pad is provided with a bar-shaped groove that matches with the concave-convex of the bar-shaped bump. The length of the groove, the elastic insulating pad is provided with a relief opening directly below the bar-shaped groove for letting go of the insulating support block between the high-voltage winding and the low-voltage winding.