A fixing structure of a transformer body and a transformer

Abstract

The utility model relates to transformer technical field, especially a kind of fixing structure of transformer body and transformer.A kind of fixing structure of transformer body, including iron core, the upper clamping piece assembly and lower clamping piece assembly for clamping the iron core, the upper end of the iron core is equipped with upper yoke section, the lower end of the iron core is equipped with lower yoke section;The upper clamping piece assembly includes upper clamping piece, first fixed block and second fixed block, the width direction of the upper yoke section two sides is respectively provided with the upper clamping piece.The fixing structure of transformer body, can make full use of the internal space of oil tank, while guaranteeing that the electrical insulation distance of high voltage bushing and upper clamping piece assembly can satisfy the requirement, without increasing the width in oil tank, solve the existing high voltage bushing height lower, the electrical insulation distance between the upper clamping piece structure in transformer and high voltage bushing cannot satisfy the requirement when, when reducing the technical problem of iron core window high to the width in oil tank have greater requirement.

Description

Technical Field

[0001] This utility model relates to the field of transformer technology, and in particular to a fixing structure for a transformer body and a transformer. Background Technology

[0002] In transformer structures, high-voltage bushings are typically located on the side wall of the tank, while the transformer body is housed inside the tank. The transformer body usually includes the core, coils, and clamps. The coils are wound around the core, and the clamps are used to hold and compact the core. Clamps are generally divided into upper and lower clamp structures, clamping the upper and lower ends of the core, respectively. In existing transformer body structures, the upper end of the upper clamp structure usually has a mounting plate for fixing the upper clamp structure to the inner wall of the tank, resulting in a relatively thick upper clamp structure. Since the mounting plate is usually located near the high-voltage bushing, when the high-voltage bushing height is low, the core window height is usually reduced to maintain a good electrical insulation distance between the upper clamp structure and the high-voltage bushing. However, in the electromagnetic design of transformers, to meet performance requirements, reducing the core window height (i.e., reducing the coil height) inevitably increases the coil's width, requiring a corresponding increase in the tank width. Therefore, this method places significant demands on the tank's inner width, making the high-voltage bushing height have a significant impact on the core window height. Utility Model Content

[0003] In response to the problems raised in the background art, the purpose of this utility model is to propose a fixing structure for the transformer body that can make full use of the internal space of the oil tank. While ensuring that the electrical insulation distance between the high-voltage bushing and the upper clamp assembly meets the requirements, it does not require increasing the inner width of the oil tank, effectively reducing the cost of the transformer. This solves the technical problem that when the height of the existing high-voltage bushing is low, the electrical insulation distance between the upper clamp structure and the high-voltage bushing inside the transformer cannot meet the requirements, and when the core window height is reduced, there are greater requirements for the inner width of the oil tank.

[0004] Another objective of this invention is to propose a transformer using the aforementioned fixed structure of the transformer body.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: A fixing structure for a transformer core includes an iron core, an upper clamping assembly and a lower clamping assembly for clamping the iron core, wherein the upper end of the iron core is provided with an upper yoke section and the lower end of the iron core is provided with a lower yoke section. The upper clamping component assembly includes an upper clamping component, a first fixing block, and a second fixing block. The upper clamping component is provided on both sides of the upper yoke segment in the width direction. The upper clamping component is used to clamp and fix the upper yoke segment. The first fixing block is fixedly disposed on the top surface of the upper clamping component. The second fixing block is fixedly disposed on the side wall of the upper clamping component away from the upper yoke segment. The second fixing block is fixedly connected to the lower part of the upper clamping component. The horizontal plane where the top surface of the second fixing block is located is lower than the horizontal plane where the top surface of the first fixing block is located. The lower clamping component assembly includes a lower clamping component, and the lower clamping component is respectively provided on both sides of the lower yoke segment in the width direction. The lower clamping component is used to clamp and fix the lower yoke segment.

[0006] Optionally, the upper clamping members are symmetrically arranged on both sides of the upper yoke section, and the first fixing block and the second fixing block are distributed at both ends of the upper clamping members along their length.

[0007] Optionally, in the upper clamp located on one side of the upper yoke section, the first fixing block is respectively provided at both ends of the upper clamp in the length direction; In the upper clamp located on the other side of the upper yoke section, one end of the upper clamp in the length direction is provided with the first fixing block, and the other end of the upper clamp in the length direction is provided with the second fixing block.

[0008] Optionally, the upper clamping member includes a first horizontal plate, a first vertical plate, and a second horizontal plate. The first vertical plate is arranged along the height direction of the iron core. The upper end of the first vertical plate is fixedly connected to the first horizontal plate, and the lower end of the first vertical plate is fixedly connected to the second horizontal plate. The first horizontal plate and the second horizontal plate extend in a direction away from the upper yoke section, respectively. The second fixing block is fixedly connected to the upper end face of the second horizontal plate.

[0009] Optionally, the upper clamp further includes a connecting plate, which is connected between the first horizontal plate and the second horizontal plate, and the connecting plate is located at both ends of the length direction of the first vertical plate.

[0010] Optionally, the first fixing block and the second fixing block have the same structure, and the second fixing block is L-shaped.

[0011] Optionally, the second fixing block includes a mounting horizontal plate, a mounting vertical plate, and a reinforcing plate. The mounting horizontal plate is arranged horizontally and perpendicular to the first vertical plate. The mounting vertical plate is arranged vertically and connected to the end of the mounting horizontal plate away from the first vertical plate. The reinforcing plate is L-shaped and fixedly connected to one side of the mounting vertical plate and the mounting horizontal plate. The mounting plate is fixedly connected to the upper end face of the second plate.

[0012] Optionally, the mounting vertical plate has a plurality of first mounting through holes arranged along the height direction of the mounting vertical plate, and the mounting horizontal plate has a plurality of second mounting through holes arranged along the length direction of the mounting horizontal plate.

[0013] Optionally, the upper clamping assembly further includes a pad, which is disposed between the mounting cross plate and the second cross plate.

[0014] A transformer includes an oil tank body, a high-voltage bushing, and a fixing structure for the transformer body. The high-voltage bushing is fixedly disposed on one side wall of the oil tank body and is located on one side of the upper clamp along its length. The high-pressure bushing is disposed near one of the upper clamps. In the upper clamp near the high-pressure bushing, a first fixing block is disposed at one end of the upper clamp in the length direction, and a second fixing block is disposed at the other end of the upper clamp in the length direction, and the second fixing block is located at the end of the upper clamp near the high-pressure bushing. In another of the upper clamping components, the first fixing blocks are respectively provided at both ends of the upper clamping component along its length.

[0015] Compared with the prior art, the embodiments of this utility model have the following beneficial effects: By setting a first fixing block and a second fixing block, and fixing the second fixing block to the lower part of the upper clamp, the horizontal plane of the top surface of the second fixing block is lower than the horizontal plane of the top surface of the first fixing block. The second fixing block is fixedly installed on the side of the upper clamp near the high-voltage bushing of the transformer tank sidewall. Since the horizontal plane of the top surface of the second fixing block is lower, the distance between the high-voltage bushing and the second fixing block can be increased, thereby meeting the insulation distance requirements between the high-voltage bushing and the upper clamp assembly. At the same time, since the second fixing block is fixedly set on the sidewall of the upper clamp away from the upper yoke section, the internal space of the tank can be fully utilized. While ensuring that the electrical insulation distance between the high-voltage bushing and the upper clamp assembly meets the requirements, it is not necessary to increase the inner width of the tank, effectively reducing the cost of the transformer. This solves the technical problem that when the height of the existing high-voltage bushing is low, the electrical insulation distance between the upper clamp structure and the high-voltage bushing in the transformer cannot meet the requirements, and when the core window height is reduced, there are large requirements for the inner width of the tank. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the fixing structure of the transformer body according to an embodiment of the present invention.

[0017] Figure 2 This is a three-dimensional structural diagram of the fixing structure of the transformer body according to one embodiment of the present utility model.

[0018] Figure 3 for Figure 2 Enlarged view of point A.

[0019] Figure 4 This is a cross-sectional view of a transformer according to an embodiment of the present invention.

[0020] In the attached diagram: 1. Iron core, 11. Upper yoke section, 12. Lower yoke section, 2. Upper clamping assembly, 21. Upper clamping member, 21. First horizontal plate, 211. First vertical plate, 212. Second horizontal plate, 213. Connecting plate, 214. First fixing block, 22. Second fixing block, 23. Mounting horizontal plate, 231. Second mounting through hole, 2311. Mounting vertical plate, 232. First mounting through hole, 2321. Reinforcing plate, 233. Pad plate, 24. Lower clamping assembly, 31. Lower clamping member, 4. Oil tank body, 5. High-pressure bushing. Detailed Implementation

[0021] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0022] In the description of this utility model, it should be understood that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" and "second" may explicitly or implicitly include one or more of these features, used to distinguish descriptive features, without any order or emphasis.

[0023] like Figures 1 to 3 As shown, a fixing structure for a transformer body includes an iron core 1, an upper clamping assembly 2 and a lower clamping assembly 3 for clamping the iron core 1, an upper yoke section 11 is provided at the upper end of the iron core 1, and a lower yoke section 12 is provided at the lower end of the iron core 1. The upper clamping component 2 includes an upper clamping component 21, a first fixing block 22, and a second fixing block 23. The upper clamping component 21 is respectively provided on both sides of the upper yoke segment 11 in the width direction. The upper clamping component 21 is used to clamp and fix the upper yoke segment 11. The first fixing block 22 is fixedly disposed on the top surface of the upper clamping component 21. The second fixing block 23 is fixedly disposed on the side wall of the upper clamping component 21 away from the upper yoke segment 11. The second fixing block 23 is fixedly connected to the lower part of the upper clamping component 21. The horizontal plane where the top surface of the second fixing block 23 is located is lower than the horizontal plane where the top surface of the first fixing block 22 is located. The lower clamping component assembly 3 includes a lower clamping component 31. The lower clamping components 31 are respectively provided on both sides of the lower yoke segment 12 in the width direction. The lower clamping components 31 are used to clamp and fix the lower yoke segment 12.

[0024] In this embodiment of the present invention, both the first fixing block 22 and the second fixing block 23 are used to fix the upper clamp 21 to the inner wall of the transformer tank body. By setting the first fixing block 22 and the second fixing block 23, and fixing the second fixing block 23 to the lower part of the upper clamp 21, the horizontal plane of the top surface of the second fixing block 23 is lower than the horizontal plane of the top surface of the first fixing block 22. The second fixing block 23 is fixedly installed on the side of the high-voltage bushing of the upper clamp 21 near the side wall of the transformer tank body. At this time, because the horizontal plane of the top surface of the second fixing block 23 is lower, it can... This increases the distance between the high-voltage bushing and the second fixing block 23, thereby meeting the insulation distance requirement between the high-voltage bushing and the upper clamping assembly 2. Simultaneously, by fixing the second fixing block 23 to the side wall of the upper clamping assembly 21 away from the upper yoke section 11, the internal space of the tank can be fully utilized. While ensuring that the electrical insulation distance between the high-voltage bushing and the upper clamping assembly 2 meets the requirements, it is not necessary to increase the inner width of the tank, effectively reducing the cost of the transformer. This solves the technical problem that when the existing high-voltage bushing height is low, the electrical insulation distance between the upper clamping structure and the high-voltage bushing inside the transformer cannot meet the requirements, and when the core window height is reduced, there are significant requirements for the inner width of the tank.

[0025] Preferably, the upper clamp 21 is symmetrically arranged on both sides of the upper yoke section 11, and the first fixing block 22 and the second fixing block 23 are distributed at both ends of the upper clamp 21 along its length.

[0026] By symmetrically arranging the upper clamping member 21 on both sides of the upper yoke section 11, the stability of clamping the iron core 1 can be improved. By distributing the first fixing block 22 and the second fixing block 23 at both ends of the length direction of the upper clamping member 21, the fixing effect can be avoided from being concentrated in the middle of the upper clamping member 21 when the upper clamping member 21 is fixedly connected to the inner wall of the transformer tank body, thereby improving the fixing stability of the upper clamping member 21 to the inner wall of the transformer tank body.

[0027] In one embodiment of the present invention, the upper clamp 21 located on one side of the upper yoke section 11 is provided with the first fixing block 22 at both ends of the upper clamp 21 in the length direction; In the upper clamp 21 located on the other side of the upper yoke section 11, one end of the upper clamp 21 in the length direction is provided with the first fixing block 22, and the other end of the upper clamp 21 in the length direction is provided with the second fixing block 23.

[0028] Specifically, in the transformer structure, the high-voltage bushing is located on one side wall of the tank body, and the high-voltage bushing is located on one side of the upper clamp 21 along its length. The high-voltage bushing is positioned close to one of the upper clamps 21. In this embodiment, by setting the first fixing block 22 at one end of the upper clamp 21 close to the high-voltage bushing and the second fixing block 23 at the other end, the second fixing block 23 is positioned at the end of the upper clamp 21 close to the high-voltage bushing. This ensures the electrical insulation distance between the second fixing block 23 and the high-voltage bushing, without requiring all fixing blocks to be fixedly connected to the lower part of the upper clamp 21.

[0029] To further illustrate, in the embodiments of this utility model, the first fixing block 22 and the second fixing block 23 are independently disposed on the upper clamp 21. For example, the two first fixing blocks 22 disposed opposite to each other on the two upper clamps 21 are independent of each other and no connection structure is provided. Since the position of the low-voltage bushing inside the transformer is low, the connecting bus needs to pass through from above the iron core 1. This arrangement can avoid assembly interference between the low-voltage connecting bus and the connection structure between the two first fixing blocks 22.

[0030] To further explain, the upper clamp 21 includes a first horizontal plate 211, a first vertical plate 212, and a second horizontal plate 213. The first vertical plate 212 is arranged along the height direction of the iron core 1. The upper end of the first vertical plate 212 is fixedly connected to the first horizontal plate 211, and the lower end of the first vertical plate 212 is fixedly connected to the second horizontal plate 213. The first horizontal plate 211 and the second horizontal plate 213 extend in a direction away from the upper yoke section 11, respectively. The second fixing block 23 is fixedly connected to the upper end face of the second horizontal plate 213.

[0031] Specifically, the lower clamp 31 has the same structure as the upper clamp 21.

[0032] By setting the first horizontal plate 211, the first vertical plate 212, and the second horizontal plate 213, the upper clamp 21 adopts a channel steel structure, which has the characteristics of good bending and compressive resistance and high structural strength. The second fixing block 23 is fixedly connected to the upper end face of the second horizontal plate 213, thereby realizing the fixed connection between the second fixing block 23 and the lower part of the upper clamp 21.

[0033] Preferably, the upper clamp 21 further includes a connecting plate 214, which is connected between the first horizontal plate 211 and the second horizontal plate 213, and the connecting plate 214 is located at both ends of the length direction of the first vertical plate 212.

[0034] By setting the connecting plate 214 and placing the connecting plate 214 at both ends of the length direction of the first vertical plate 212, the structural strength of the upper clamp 21 can be further improved, thereby improving the clamping stability of the iron core 1.

[0035] Specifically, the first fixing block 22 and the second fixing block 23 have the same structure, and the second fixing block 23 is L-shaped.

[0036] By setting the shapes of the first fixing block 22 and the second fixing block 23 to L-shape, and by adopting the structure of angle steel, the first fixing block 22 and the second fixing block 23 have the advantages of good structural stability and good bending resistance.

[0037] To further explain, the second fixing block 23 includes a horizontal mounting plate 231, a vertical mounting plate 232, and a reinforcing plate 233. The horizontal mounting plate 231 is arranged horizontally and perpendicular to the first vertical plate 212. The vertical mounting plate 232 is arranged vertically and is connected to the end of the horizontal mounting plate 231 away from the first vertical plate 212. The reinforcing plate 233 is L-shaped and is fixedly connected to one side of the vertical mounting plate 232 and the horizontal mounting plate 231. The mounting plate 231 is fixedly connected to the upper end face of the second plate 213.

[0038] By setting the mounting horizontal plate 231, the mounting vertical plate 232, and the reinforcing plate 233, the mounting horizontal plate 231 and the mounting vertical plate 232 form an L-shaped structure of the second fixing block 23, and the reinforcing plate 233 can enhance the connection stability between the mounting horizontal plate 231 and the mounting vertical plate 232. The mounting horizontal plate 231 is fixedly connected to the upper end face of the second horizontal plate 213, realizing the fixed connection between the second fixing block 23 and the lower part of the upper clamp 21.

[0039] Specifically, in the first fixing block 22, the mounting horizontal plate 231 of the first fixing block 22 is fixedly connected to the upper end face of the first horizontal plate 211.

[0040] To further explain, the mounting vertical plate 232 has a plurality of first mounting through holes 2321, which are arranged along the height direction of the mounting vertical plate 232. The mounting horizontal plate 231 has a plurality of second mounting through holes 2311, which are arranged along the length direction of the mounting horizontal plate 231.

[0041] By providing the first mounting through hole 2321 in the mounting vertical plate 232, the upper clamp 21 can be fixedly connected to the inner wall of the transformer tank body using fasteners such as bolts. By providing the second mounting hole 2311 in the mounting horizontal plate 231, the first fixing block 22 or the second fixing block 23 can be detachably mounted and fixed to the upper clamp 21 using fasteners such as bolts, facilitating maintenance and component replacement. Specifically, the first horizontal plate 211 has corresponding mounting holes for detachable connection with the first fixing block 22, and the second horizontal plate 213 has corresponding mounting holes for detachable connection with the second fixing block 23.

[0042] Preferably, the upper clamping component 2 further includes a pad 24, which is disposed between the mounting horizontal plate 231 and the second horizontal plate 213.

[0043] By setting the pad 24, the rigidity and stability of the connection area between the mounting plate 231 and the second plate 213 can be improved, preventing the mounting plate 231 from warping under connection stress.

[0044] Specifically, in the connection of the second fixing block 23, the mounting horizontal plate 231 protrudes from the second horizontal plate 213, and a second mounting hole 2311 is formed at the position where the mounting horizontal plate 231 protrudes from the second horizontal plate 213. The pad 24 has a corresponding mounting hole, so that a detachable connection between the pad 24 and the mounting horizontal plate 231 can be achieved using bolts. The mounting horizontal plate 231 has a second mounting hole 2311 at the position corresponding to the second horizontal plate 213, and the pad 24 also has a corresponding mounting hole, so that a detachable connection between the second fixing block 23 and the second horizontal plate 213 can be achieved using bolts.

[0045] Similarly, in the connection of the first fixing block 22, the mounting horizontal plate 231 protrudes from the first horizontal plate 211, and the position of the mounting horizontal plate 231 protruding from the first horizontal plate 211 is detachably connected to the pad 24. The position of the mounting horizontal plate 231 corresponding to the first horizontal plate 211 clamps the pad 24 (at this position, the mounting horizontal plate 231, the pad 24 and the first horizontal plate 211 are detachably connected).

[0046] like Figure 4 As shown, a transformer includes an oil tank body 4, a high-voltage bushing 5, and a fixing structure for the transformer body. The high-voltage bushing 5 is fixedly installed on one side wall of the oil tank body 4, and the high-voltage bushing 5 is located on one side of the upper clamp 21 along its length. The high-pressure bushing 5 is disposed near one of the upper clamps 21. In the upper clamp 21 near the high-pressure bushing 5, one end of the upper clamp 21 in the length direction is provided with the first fixing block 22, and the other end of the upper clamp 21 in the length direction is provided with the second fixing block 23. The second fixing block 23 is located at the end of the upper clamp 21 near the high-pressure bushing 5. In another upper clamp 21, the first fixing block 22 is respectively provided at both ends of the upper clamp 21 in the length direction.

[0047] Since the second fixing block 23 is located at one end of the upper clamp 21 near the high-voltage bushing 5, and the horizontal plane of the top surface of the second fixing block 23 is lower than the horizontal plane of the top surface of the first fixing block 22, the electrical insulation distance between the high-voltage bushing 5 and the second fixing block 23 can meet the requirements.

[0048] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without any inventive effort, and these embodiments will all fall within the scope of protection of this utility model.

Claims

1. A fixing structure for a transformer body, characterized in that, It includes an iron core, an upper clamping assembly and a lower clamping assembly for clamping the iron core, wherein the upper end of the iron core is provided with an upper yoke section and the lower end of the iron core is provided with a lower yoke section; The upper clamping component assembly includes an upper clamping component, a first fixing block, and a second fixing block. The upper clamping component is provided on both sides of the upper yoke segment in the width direction. The upper clamping component is used to clamp and fix the upper yoke segment. The first fixing block is fixedly disposed on the top surface of the upper clamping component. The second fixing block is fixedly disposed on the side wall of the upper clamping component away from the upper yoke segment. The second fixing block is fixedly connected to the lower part of the upper clamping component. The horizontal plane where the top surface of the second fixing block is located is lower than the horizontal plane where the top surface of the first fixing block is located. The lower clamping component assembly includes a lower clamping component, and the lower clamping component is respectively provided on both sides of the lower yoke segment in the width direction. The lower clamping component is used to clamp and fix the lower yoke segment.

2. The fixing structure for the transformer body according to claim 1, characterized in that, The upper clamps are symmetrically arranged on both sides of the upper yoke section, and the first fixing block and the second fixing block are distributed at both ends of the upper clamps along their length.

3. The fixing structure for the transformer body according to claim 2, characterized in that, In the upper clamp located on one side of the upper yoke section, the first fixing block is respectively provided at both ends of the upper clamp in the length direction; In the upper clamp located on the other side of the upper yoke section, one end of the upper clamp in the length direction is provided with the first fixing block, and the other end of the upper clamp in the length direction is provided with the second fixing block.

4. The fixing structure for the transformer body according to claim 1, characterized in that, The upper clamping member includes a first horizontal plate, a first vertical plate, and a second horizontal plate. The first vertical plate is arranged along the height direction of the iron core. The upper end of the first vertical plate is fixedly connected to the first horizontal plate, and the lower end of the first vertical plate is fixedly connected to the second horizontal plate. The first horizontal plate and the second horizontal plate extend in a direction away from the upper yoke section, respectively. The second fixing block is fixedly connected to the upper end face of the second horizontal plate.

5. The fixing structure for the transformer body according to claim 4, characterized in that, The upper clamp also includes a connecting plate, which is connected between the first horizontal plate and the second horizontal plate, and the connecting plate is located at both ends of the length direction of the first vertical plate.

6. The fixing structure for the transformer body according to claim 4, characterized in that, The first fixing block and the second fixing block have the same structure, and the second fixing block is L-shaped.

7. The fixing structure for the transformer body according to claim 6, characterized in that, The second fixing block includes a horizontal mounting plate, a vertical mounting plate, and a reinforcing plate. The horizontal mounting plate is arranged horizontally and perpendicular to the first vertical plate. The vertical mounting plate is arranged vertically and connected to the end of the horizontal mounting plate away from the first vertical plate. The reinforcing plate is L-shaped and is fixedly connected to one side of the vertical mounting plate and the horizontal mounting plate. The mounting plate is fixedly connected to the upper end face of the second plate.

8. The fixing structure for the transformer body according to claim 7, characterized in that, The mounting vertical plate has multiple first mounting through holes, which are arranged along the height direction of the mounting vertical plate. The mounting horizontal plate has multiple second mounting through holes, which are arranged along the length direction of the mounting horizontal plate.

9. The fixing structure for the transformer body according to claim 7, characterized in that, The upper clamping assembly also includes a pad, which is disposed between the mounting plate and the second plate.

10. A transformer, characterized in that, The transformer includes an oil tank body, a high-voltage bushing, and a fixing structure for the transformer body as described in any one of claims 1 to 9. The high-voltage bushing is fixedly disposed on one side wall of the oil tank body and is located on one side of the upper clamp along its length. The high-pressure bushing is disposed near one of the upper clamps. In the upper clamp near the high-pressure bushing, a first fixing block is disposed at one end of the upper clamp in the length direction, and a second fixing block is disposed at the other end of the upper clamp in the length direction, and the second fixing block is located at the end of the upper clamp near the high-pressure bushing. In another of the upper clamping components, the first fixing blocks are respectively provided at both ends of the upper clamping component along its length.

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