Dry-type transformer pressing device

Abstract

The utility model provides a dry-type transformer pressing device which is fixed on a pressing nail support and comprises a pressing block, a pressing nail assembly located above the pressing block, an outer coil pressing block, an inner coil pressing block and an insulating cylinder pressing block, and the outer coil pressing block, the inner coil pressing block and the insulating cylinder pressing block are located below the pressing block. Wherein the nail pressing assemblies are fixed on the nail pressing support and pressed between the nail pressing support and the pressing block, and each set of nail pressing assembly comprises a nail pressing bolt, a locking nut, a gasket and a nail pressing bowl. The dry-type transformer pressing device is high in universality, can effectively fix the inner coil, the outer coil and the insulating cylinder, counteracts axial electrodynamic force and radial electrodynamic force generated when short circuit occurs suddenly, and meanwhile can increase the creepage distance from the coils to the pressing nails, increase the electrical distance of the ends of the coils, reduce the intensity of an electric field and further reduce partial discharge.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of dry -type transformer especially relates to a dry -type transformer compression device. BACKGROUND

[0002] Power transformer is very key equipment in power supply system, when transformer transports energy to load, there is current flowing through high voltage winding, low voltage winding and producing leakage magnetic field around winding, current in winding and leakage magnetic field interact to make electric power in winding, especially when short circuit fault suddenly occurs in secondary side of transformer, great current will be produced in transformer and make winding suffer great electric power, this electric power can be decomposed into axial electric power and amplitude electric power, axial electric power needs compression device to fix winding. SUMMARY

[0003] In view of the deficiency in prior art, the utility model aims at providing a dry -type transformer compression device.

[0004] To achieve the above -mentioned purpose, the utility model adopts the following solution:

[0005] The utility model provides a dry -type transformer compression device, is fixed on the compression nail support, includes the compression block, is located the compression nail assembly above the compression block and is located the outer coil compression block, inner coil compression block and insulating cylinder compression block below the compression block, wherein, the compression nail assembly is fixed on the compression nail support, is compressed between the compression nail support and the compression block, includes at least two sets of compression nail assembly, each set of compression nail assembly includes compression nail bolt, locking nut, gasket and compression nail bowl, the extension end of the compression nail bolt is from below to above and is rotated into the compression nail support, the compression nail bowl is arranged between the compression block and the compression nail support, the locking nut is worn on the compression nail bolt and is fixed between the compression nail support and the compression nail bowl through the gasket, first recess is equipped in the compression nail bowl, and the bolt head of the compression nail bolt is located in the first recess of the compression nail bowl.

[0006] Preferably, the gasket is located between the bolt head of the compression nail bolt and the locking nut and is arranged on the compression nail bowl, and the diameter of the gasket is greater than the diameter of the first recess of the compression nail bowl.

[0007] Preferably, second recess is equipped on the contact surface of the compression block and the compression nail bowl of the compression nail assembly, and the width of the second recess is less than the diameter of the compression nail bowl.

[0008] Preferably, first sliding groove is equipped in the bottom of the compression block, and the outer coil compression block, the inner coil compression block and the insulating cylinder compression block are located in the first sliding groove.

[0009] Preferably, a silicon rubber pad is arranged between the outer coil pressing block, the inner coil pressing block and the insulation cylinder pressing block and the pressing block respectively.

[0010] Preferably, the outer coil pressing block comprises an outer coil pressing block body for pressing the top of the outer coil and an outer coil side pressing block located at the side of the outer coil.

[0011] Preferably, the outer coil side pressing block is located at the inner side of the outer coil.

[0012] Preferably, the inner coil pressing block comprises an inner coil pressing block body for pressing the top of the inner coil and an inner coil side pressing block located at the side of the inner coil.

[0013] Preferably, the inner coil side pressing block is located at the inner side of the inner coil.

[0014] Preferably, the insulation cylinder pressing block is a barrel-shaped structure same as the insulation cylinder, and a second sliding groove is arranged at the bottom of the barrel-shaped structure, and the top of the insulation cylinder is located in the second sliding groove.

[0015] Advantages

[0016] The dry-type transformer pressing device has high universality, can effectively fix the inner coil, the outer coil and the insulation cylinder, offsets the axial electric force and the amplitude electric force generated when a sudden short circuit occurs, can increase the creepage distance from the coil to the pressing nail, increase the electrical distance of the coil end, reduce the electric field strength, and further reduce the partial discharge. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 FIG. 1 is a structural schematic view of the dry-type transformer pressing device according to the present application.

[0018] Figure 2 FIG. 4 is a structural schematic view of the bottom surface of the pressing block of the dry-type transformer pressing device according to the present application. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0021] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0022] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the product of the present application is used, and are merely for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description and cannot be understood as indicating or implying relative importance.

[0023] In addition, the terms "horizontal", "vertical" and the like do not mean that the components must be absolutely horizontal or vertical, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0024] In the description of the present application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "provided", "mounted", "connected", "connected" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0025] To this end, the following scheme is proposed:

[0026] Referring to Figure 1 The present application provides a dry-type transformer pressing device 100 fixed on a pressing nail bracket 200, wherein the pressing nail bracket 200 comprises a transverse pressing nail bracket 210 and a longitudinal pressing nail bracket 220, the dry-type transformer pressing device 100 of the present application is fixed on the transverse pressing nail bracket 210, and the longitudinal pressing nail bracket 220 is fixed on the core of the dry-type transformer.

[0027] In the utility model, the dry-type transformer compression device 100 includes a pressing block 110, a pressing nail assembly 120 above the pressing block 110 and an outer coil pressing block 130, an inner coil pressing block 140 and an insulation cylinder pressing block 150 below the pressing block 110, the outer coil pressing block 130 is used for pressing the outer coil A, the inner coil pressing block 140 is used for pressing the inner coil B and the insulation cylinder pressing block 150 is used for pressing the insulation cylinder C.

[0028] Specifically, in the dry-type transformer compression device 100 provided by the utility model, the pressing nail assembly 120 is fixed on the transverse pressing nail support 210 of the pressing nail support 200 and is compressed between the transverse pressing nail support 210 and the pressing block 110. Figure 1 In the utility model, at least two sets of pressing nail assemblies 120 are included (two sets of pressing nail assemblies 120 are shown in the figure) The extension end of the pressing nail bolt 121 is screwed into the transverse pressing nail support 210 of the pressing nail support 200 from bottom to top, the pressing nail bowl 124 is arranged between the pressing block 110 and the transverse pressing nail support 210 of the pressing nail support 200, the locking nut 122 is sleeved on the pressing nail bolt 121 and is fixed between the transverse pressing nail support 210 of the pressing nail support 200 and the pressing nail bowl 124 through the gasket 123.

[0029] Further, as a preferred embodiment of the utility model, a first groove 124a is arranged in the pressing nail bowl 124, the bolt head 121a of the pressing nail bolt 121 is located in the first groove 124a of the pressing nail bowl 124 and is wrapped in the first groove 124a of the pressing nail bowl 124.

[0030] In the dry-type transformer compression device 100 provided by the utility model, the pressing block 110 and the pressing nail bowl 124 of the pressing nail assembly 120 arranged between the pressing block 110 and the pressing nail support 200 can increase the creepage distance of the coil to the pressing nail, increase the electrical distance of the coil end, reduce the electric field intensity and further reduce the partial discharge.

[0031] Further, as a preferred embodiment of the utility model, the gasket 123 is located between the bolt head 121a of the pressing nail bolt 121 and the locking nut 122 and is arranged on the pressing nail bowl 124, the diameter of the gasket 123 should be greater than the diameter of the first groove 124a of the pressing nail bowl 124. The gasket 123 is used for increasing the stress area of the pressing nail assembly 120 and compresses the pressing block 110 more stably.

[0032] Further, as a preferred embodiment of the utility model, a second groove 111 is arranged on the contact surface of the pressure block 110 and the pressure nail bowl 124 of the pressure nail assembly 120, and the width of the second groove 111 is smaller than the diameter of the pressure nail bowl 124.

[0033] Specifically, in the dry-type transformer compression device 100 provided by the utility model, as shown in the drawings, Figure 2 a first sliding groove 112 is arranged on the bottom of the pressure block 110, and the outer coil pressure block 130, the inner coil pressure block 140 and the insulation cylinder pressure block 150 are located in the first sliding groove 112.

[0034] In the existing dry-type transformer compression device, the outer coil and the inner coil usually adopt independent pressure blocks and independent pressure nails, when the model of the outer coil and the inner coil changes, the pressure blocks or the pressure nails need to be replaced, or when the installation position of the outer coil and the inner coil changes, the locking position of the pressure nail on the pressure nail support needs to be adjusted, which brings inconvenience to installation and maintenance.

[0035] In the utility model, the pressure block 110 and the outer coil pressure block 130, the inner coil pressure block 140 and the insulation cylinder pressure block 150 are adopted, the outer coil pressure block 130 is used for pressing the outer coil A, the inner coil pressure block 140 is used for pressing the inner coil B, and the insulation cylinder pressure block 150 is used for pressing the insulation cylinder C, when the model of the outer coil A, the inner coil B and the insulation cylinder C changes, these pressure blocks do not need to be replaced, and the universality is enhanced; moreover, the outer coil pressure block 130, the inner coil pressure block 140 and the insulation cylinder pressure block 150 are located in the first sliding groove 112 at the bottom of the pressure block 110 and can move in the first sliding groove 112, when the installation position of the outer coil A, the inner coil B and the insulation cylinder C needs to change, the outer coil pressure block 130, the inner coil pressure block 140 and the insulation cylinder pressure block 150 only need to be moved in the first sliding groove 112, the position of the outer coil pressure block 130, the inner coil pressure block 140 and the insulation cylinder pressure block 150 in the first sliding groove 112 can be freely adjusted, and the position of the pressure nail assembly 120 above the pressure block 110 does not need to be adjusted, which brings convenience to installation and maintenance, can offset the slight position change due to ground vibration or strong wind in the use process, and can offset the electric force generated when a sudden short circuit occurs in the use process.

[0036] Further, as a preferred embodiment of the utility model, a silicon rubber pad (not shown in the drawings) is arranged between the outer coil pressure block 130, the inner coil pressure block 140 and the insulation cylinder pressure block 150 and the pressure block 110 respectively, so as to ensure the compression of the outer coil A, the inner coil B and the insulation cylinder C, increase the friction between the outer coil pressure block 130, the inner coil pressure block 140 and the insulation cylinder pressure block 150 and the pressure block 110, and make the coil not prone to displacement.

[0037] Further, as a preferred embodiment of the utility model, the outer coil pressing block 130 includes an outer coil pressing block body 131 for pressing the top of the outer coil A and an outer coil side pressing block 132 located at the side of the outer coil A, and in some embodiments, the outer coil side pressing block 132 is located at the inner side of the outer coil A.

[0038] Further, as a preferred embodiment of the utility model, the inner coil pressing block 140 includes an inner coil pressing block body 141 for pressing the top of the inner coil B and an inner coil side pressing block 142 located at the side of the inner coil B, and in some embodiments, the inner coil side pressing block 142 is located at the inner side of the inner coil B.

[0039] In the utility model, the outer coil side pressing block 132 is arranged at the side of the outer coil A, and the inner coil side pressing block 142 is arranged at the side of the inner coil B, which can effectively prevent the lateral movement of the outer coil A and the inner coil B. Moreover, the outer coil sliding pressing block body 131, the inner coil sliding pressing block body 141 and the insulation cylinder sliding pressing block 150 can effectively offset the axial electric force generated during sudden short circuit, and the outer coil sliding side pressing block 132 and the inner coil sliding side pressing block 142 can effectively offset the amplitude electric force generated during sudden short circuit.

[0040] Further, as a preferred embodiment of the utility model, the insulation cylinder pressing block 150 is a barrel-shaped structure same as the insulation cylinder C, and a second sliding groove 151 is arranged at the bottom of the barrel-shaped structure, and the top of the insulation cylinder C is located in the second sliding groove 151.

[0041] In the dry-type transformer pressing device 100 provided by the utility model, the outer coil pressing block 130, the inner coil pressing block 140 and the insulation cylinder pressing block 150 are arranged in the first sliding groove 112 at the bottom of the pressing block 110, which can freely position according to the position of the outer coil A, the inner coil B and the insulation cylinder C, has strong versatility, and can effectively fix the outer coil A, the inner coil B and the insulation cylinder C, and offset the electric force generated during sudden short circuit.

[0042] The above-mentioned is only the preferred embodiment of the utility model, and it should be pointed out that for the ordinary skilled in the art, without departing from the principle of the utility model, a number of improvements and refinements can be made, and these improvements and refinements should be regarded as the protection range of the utility model.

Claims

1. A clamping device for a dry-type transformer, fixed on a clamping nail bracket, characterized in that, The device includes a pressure block, a pin assembly located above the pressure block, and an outer coil pressure block, an inner coil pressure block, and an insulating cylinder pressure block located below the pressure block. The pin assembly is fixed to the pin support and pressed between the pin support and the pressure block. It includes at least two sets of pin assemblies. Each set of pin assemblies includes a pin bolt, a locking nut, a washer, and a pin cup. The extended end of the pin bolt is screwed into the pin support from bottom to top. The pin cup is located between the pressure block and the pin support. The locking nut is sleeved on the pin bolt and fixed between the pin support and the pin cup by the washer. A first groove is provided inside the pin cup, and the bolt head of the pin bolt is located within the first groove of the pin cup.

2. The dry-type transformer clamping device according to claim 1, characterized in that, The washer is located between the bolt head of the pressure bolt and the locking nut, and is disposed on the pressure bowl. The diameter of the washer is larger than the diameter of the first groove of the pressure bowl.

3. The dry-type transformer clamping device according to claim 1, characterized in that, A second groove is provided on the contact surface between the pressure block and the pressure bowl of the pressure nip assembly, and the width of the second groove is smaller than the diameter of the pressure bowl.

4. The dry-type transformer clamping device according to claim 1, characterized in that, A first sliding groove is provided at the bottom of the pressure block, and the outer coil pressure block, inner coil pressure block and insulating cylinder pressure block are located in the first sliding groove.

5. The dry-type transformer clamping device according to claim 4, characterized in that, A silicone rubber pad is provided between the outer coil pressing block, the inner coil pressing block, and the insulating cylinder pressing block and the pressing block, respectively.

6. The dry-type transformer clamping device according to claim 1, characterized in that, The outer coil pressing block includes an outer coil pressing block body for pressing the top of the outer coil and an outer coil side pressing block located on the side of the outer coil.

7. The dry-type transformer clamping device according to claim 6, characterized in that, The outer coil side pressure block is located inside the outer coil.

8. The dry-type transformer clamping device according to claim 1, characterized in that, The inner coil pressing block includes an inner coil pressing block body for pressing the top of the inner coil and an inner coil side pressing block located on the side of the inner coil.

9. The dry-type transformer clamping device according to claim 8, characterized in that, The inner coil side pressure block is located inside the inner coil.

10. The dry-type transformer clamping device according to claim 1, characterized in that, The insulating cylinder pressing block is a barrel shape with the same structure as the insulating cylinder, and a second sliding groove is provided at the bottom of the barrel shape, with the top of the insulating cylinder located in the second sliding groove.

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