Secondary porcelain bushing structure of voltage transformer

Abstract

The utility model relates to the technical field of voltage transformers, in particular to a secondary porcelain bushing structure of a voltage transformer, which comprises a wiring terminal, a first sealing washer, a porcelain bushing, a first locking nut, a mounting base and a sealing sleeve. The wiring terminal is arranged in the installation base in a penetrating mode, the upper end of the wiring terminal penetrates out of the installation base, the sealing sleeve is arranged on the wiring terminal in a sleeving mode, the lower end of the sealing sleeve penetrates into the installation base, the first sealing gasket is arranged on the sealing sleeve in a sleeving mode and is in interference fit with the outer wall of the sealing sleeve, and the porcelain sleeve is arranged on the wiring terminal and located above the sealing sleeve. And the first locking nut is screwed on the wiring terminal and pushes the porcelain bushing downwards along the axial direction of the wiring terminal, so that the porcelain bushing is tightly propped against the sealing sleeve, and the porcelain bushing compresses the first sealing gasket on the mounting base so as to enable the first sealing gasket to be embedded into a protection groove formed at the lower end of the porcelain bushing. According to the secondary porcelain bushing structure of the voltage transformer, the long-term and stable sealing effect can be ensured.

Description

Technical Field

[0001] This utility model relates to the field of voltage transformer technology, and in particular to a secondary porcelain bushing structure for a voltage transformer. Background Technology

[0002] The voltage transformer housing contains a primary winding and a secondary winding. The primary winding and the secondary winding are led out of the housing through primary terminals and secondary terminals respectively located outside the housing. Primary porcelain bushings and secondary porcelain bushings are respectively installed outside the primary terminals and the secondary terminals to provide insulation protection for the primary terminals and the secondary terminals. A sealing gasket is installed between the secondary porcelain bushing and the housing to seal the position where the secondary terminals pass through the housing. In the prior art, after the sealing gasket is pressed by the secondary porcelain bushing, it is located between the end of the secondary porcelain bushing and the housing. Rainwater falling on the housing can easily penetrate between the sealing gasket and the housing, causing corrosion to the sealing gasket, which accelerates the aging of the sealing gasket and leads to sealing failure. Utility Model Content

[0003] In view of this, the purpose of this utility model is to propose a secondary porcelain bushing structure for a voltage transformer to solve the above problems.

[0004] For the purposes described above, this utility model provides:

[0005] A secondary porcelain bushing structure for a voltage transformer includes a terminal block, a first sealing washer, a porcelain bushing, and a first locking nut. It also includes a mounting base and a sealing sleeve. The mounting base is fixedly connected to the outer wall of the voltage transformer housing. The terminal block passes through the mounting base with its upper end protruding from the base. The flexible sealing sleeve is fitted onto the terminal block, with its lower end extending into the mounting base. The first sealing washer is fitted onto the sealing sleeve and presses against its outer wall. The porcelain bushing is fitted onto the terminal block above the sealing sleeve. The first locking nut is screwed onto the terminal block and pushes the porcelain bushing downwards along the terminal block's axial direction, causing the porcelain bushing to press tightly against the sealing sleeve. The porcelain bushing also presses the first sealing washer against the mounting base, embedding the first sealing washer into a protective groove formed at the lower end of the porcelain bushing.

[0006] Preferably, an insulating pad is fitted onto the lower end of the terminal block, and a second locking nut located below the insulating pad is screwed onto the lower end of the terminal block. The second locking nut cooperates with the first locking nut to make the insulating pad press tightly against the inner wall of the mounting base.

[0007] Preferably, the insulating pad and the porcelain sleeve are respectively provided with a first positioning hole and a second positioning hole that match the sealing sleeve, and the lower end and the upper end of the sealing sleeve are respectively inserted into the first positioning hole and the second positioning hole.

[0008] Preferably, the insulating pad is fan-shaped, and the mounting base has a limiting groove that matches the insulating pad, and the insulating pad is held in the limiting groove.

[0009] Preferably, a raised ring is formed at the upper end of the mounting base, and the first sealing gasket abuts against the upper end of the raised ring.

[0010] Preferably, the ceramic sleeve has a relief groove opposite to the convex ring, and the convex ring squeezes the first sealing gasket, causing the first sealing gasket to deform and get stuck in the relief groove.

[0011] Preferably, the terminal block is fitted with a second sealing washer and a cover plate located between the porcelain sleeve and the first locking nut, and the cover plate presses the second sealing washer onto the porcelain sleeve by the action of the first locking nut.

[0012] Preferably, the cover plate is umbrella-shaped with its opening facing downwards, enclosing the second sealing gasket inside.

[0013] The beneficial effects of this utility model are:

[0014] The outer seal formed by the first sealing gasket is located between the mounting base and the porcelain bushing, making the outer seal higher than the voltage transformer housing. This prevents rainwater falling on the voltage transformer housing from easily entering the space between the mounting base and the porcelain bushing and corroding the first sealing gasket. Furthermore, the first sealing gasket is protected by the protective groove, making it less susceptible to wind and sand erosion, thus slowing down the aging rate of the first sealing gasket and ensuring the long-term effectiveness of the outer seal. The inner seal achieved by the sealing sleeve, together with the outer seal, forms a double seal, enhancing the sealing effect. Moreover, the sealing sleeve is located within the sealed space and is not prone to aging, ensuring the sealing effect of the porcelain bushing structure even if the first sealing gasket fails due to aging. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a cross-sectional schematic diagram of the present invention;

[0018] Figure 3 This is an exploded view of the present invention;

[0019] Figure 4This is a schematic diagram of the ceramic sleeve in this utility model;

[0020] Figure 5 This is a schematic diagram of the mounting base in this utility model.

[0021] The diagram is marked as follows:

[0022] 1. Terminal block; 2. First sealing washer; 3. Porcelain sleeve; 31. Protective groove; 32. Second positioning hole; 33. Relief groove; 4. First locking nut; 5. Mounting base; 51. Raised ring; 52. Limiting groove; 6. Sealing sleeve; 7. Insulating pad; 71. First positioning hole; 8. Second locking nut; 9. Second sealing washer; 10. Cover plate. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.

[0024] It should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0025] like Figures 1-5As shown, a secondary porcelain sleeve 3 structure of a voltage transformer includes a terminal block 1, a first sealing washer 2, a porcelain sleeve 3, a first locking nut 4, a mounting base 5, and a sealing sleeve 6. The mounting base 5 is fixedly connected to the outer wall of the voltage transformer housing. The terminal block 1 passes through the mounting base 5 with its upper end protruding from the mounting base 5. The flexible sealing sleeve 6 is sleeved on the terminal block 1 with its lower end inserted into the mounting base 5. The first sealing washer 2 is sleeved on the sealing sleeve 6 and is interference-fitted with the outer wall of the sealing sleeve 6. The porcelain sleeve 3 is sleeved on the terminal block 1 and located above the sealing sleeve 6. The first locking nut 4 is screwed onto the terminal block 1 and pushes the porcelain sleeve 3 downward along the axial direction of the terminal block 1, so that the porcelain sleeve 3 is tightly pressed against the sealing sleeve 6, and the porcelain sleeve 3 presses the first sealing washer 2 against the mounting base 5, so that the first sealing washer 2 is embedded in the protective groove 31 formed at the lower end of the porcelain sleeve 3.

[0026] Specifically, the structure of the terminal block 1 passing through the mounting base 5 is as follows: an insulating pad 7 is sleeved on the lower end of the terminal block 1, and a second locking nut 8 located below the insulating pad 7 is screwed onto the lower end of the terminal block 1. The second locking nut 8 cooperates with the first locking nut 4 to make the insulating pad 7 press tightly against the inner wall of the mounting base 5.

[0027] When installing the aforementioned secondary porcelain bushing 3 structure of the voltage transformer, first tighten the second locking nut 8 onto the lower end of the terminal 1. Then, pass the upper end of the terminal 1 through the insulating pad 7 and the mounting base 5, so that the upper end of the terminal 1 protrudes from the mounting base 5. The insulating pad 7 is held between the second locking nut and the mounting base 5 by the limiting effect of the second locking nut 8. Next, place the sealing sleeve 6 onto the terminal 1, so that the lower end of the sealing sleeve 6 penetrates into the mounting base 5 and abuts against the insulating pad 7. Finally, place the first sealing washer 2 onto the sealing sleeve 6, making it contact the mounting base 5. The first sealing washer 2 is interference-fitted with the outer wall of the sealing sleeve 6. Next, the porcelain sleeve 3 is fitted onto the terminal 1 above the sealing sleeve 6. Finally, the first locking nut 4 is screwed onto the upper end of the terminal 1 and tightened downwards, causing the first locking nut 4 to push the porcelain sleeve 3 downwards along the axial direction of the terminal 1. This ensures that the porcelain sleeve 3 is in close contact with the sealing sleeve 6 and the first sealing washer 2. The first locking nut 4 and the second locking nut 8 apply tension at both ends of the terminal 1, causing the insulating pad 7 and the porcelain sleeve 3 to press against the sealing sleeve 6, thus shaping the sealing sleeve 6 within the mounting base 5. The porcelain sleeve 3 presses the first sealing gasket 2 against the inner wall of the mounting base 5 to achieve an inner seal. Simultaneously, the porcelain sleeve 3 presses the first sealing gasket 2 against the mounting base 5 to achieve an outer seal. The first sealing gasket 2, pressed against the mounting base 5, is embedded in the protective groove 31 (preferably a circular groove slightly larger than the outer diameter of the first sealing gasket 2) formed at the lower end of the porcelain sleeve 3, thus protecting the periphery of the first sealing gasket 2 from the porcelain sleeve 3. Through this structure, the outer seal formed by the first sealing gasket 2 is located between the mounting base 5 and the porcelain sleeve 3, ensuring that the position of the outer seal is higher than the housing of the voltage transformer and falls below... Rainwater on the voltage transformer housing is less likely to enter between the mounting base 5 and the porcelain sleeve 3 and corrode the first sealing gasket 2. Furthermore, the first sealing gasket 2 is protected by the protective groove 31 and is less susceptible to wind and sand erosion, thus slowing down the aging rate of the first sealing gasket 2 and ensuring the long-term effectiveness of the outer seal. The inner and outer seals achieved by the sealing sleeve 6 constitute a double seal, enhancing the sealing effect. Moreover, the sealing sleeve 6 is located within the sealed space and is less prone to aging. Even if the first sealing gasket 2 fails due to aging, the sealing effect of the porcelain sleeve 3 structure can still be guaranteed.

[0028] Furthermore, based on the above structure, the insulating pad 7 and the porcelain sleeve 3 are respectively provided with a first positioning hole 71 and a second positioning hole 32 that match the sealing sleeve 6. The lower end and the upper end of the sealing sleeve 6 are respectively inserted into the first positioning hole 71 and the second positioning hole 32. When the porcelain sleeve 3 and the insulating pad 7 cooperate to press the sealing sleeve 6, the first positioning hole 71 and the second positioning hole 32 play a limiting role on both ends of the sealing sleeve 6, ensuring the accuracy of the position of the sealing sleeve 6, while making both ends of the sealing sleeve 6 expand and tighten in the first positioning hole 71 and the second positioning hole 32 respectively, so as to fit tightly with the insulating pad 7 and the porcelain sleeve 3, thereby enhancing the sealing effect.

[0029] Furthermore, based on the above structure, the insulating pad 7 is fan-shaped, and the mounting base 5 has a limiting groove 52 that matches the insulating pad 7. The insulating pad 7 is held in the limiting groove 52, and the rotation of the insulating pad 7 in the limiting groove 52 is restricted by the limiting groove 52, ensuring that the insulating pad 7 does not rotate when the first locking nut 4 is tightened. This facilitates the installation of the secondary porcelain sleeve 3 structure. Moreover, after the first locking nut 4 and the second locking nut 8 are tightened, loosening of both is prevented, thereby improving the stability of the overall structure.

[0030] Furthermore, based on the above structure, a convex ring 51 is formed at the upper end of the mounting base 5, and the first sealing gasket 2 is tightly pressed against the upper end of the convex ring 51. Through the action of the convex ring 51, the sealing surface between the first sealing gasket 2 and the mounting base 5 is formed between the upper end of the convex ring 51 and the first sealing gasket 2. This makes the position of the sealing surface higher than the upper end surface of the mounting base 5. Even if a small amount of rainwater falls on the mounting base 5, it is not easy to penetrate between the convex ring 51 and the first sealing gasket 2, thereby further improving the long-term stability of the seal.

[0031] In addition, based on the above structure, the ceramic sleeve 3 is provided with a relief groove 33 that is opposite to the convex ring 51. While the ceramic sleeve 3 and the insulating pad 7 cooperate to press the sealing sleeve 6, the convex ring 51 squeezes the first sealing washer 2, causing the first sealing washer 2 to deform and get stuck in the relief groove 33. The deformation of the first sealing washer 2 makes the sealing surface between the ceramic sleeve 3 and the mounting base 5 bend, which enhances the sealing effect on the outside.

[0032] In addition, based on the above structure, the terminal 1 is fitted with a second sealing washer 9 and a cover plate 10 located between the porcelain sleeve 3 and the first locking nut 4. The cover plate 10 is pressed by the first locking nut 4 to the porcelain sleeve 3. The sealing effect between the upper end of the washer of the porcelain sleeve 3 and the terminal 1 is enhanced by the action of the second sealing washer 9, thereby enhancing the overall sealing effect of the secondary porcelain sleeve 3 structure.

[0033] Furthermore, based on the above structure, the cover plate 10 is umbrella-shaped with its opening facing downwards, covering the second sealing gasket 9 inside. The second sealing gasket 9, which is covered by the inner wall of the cover plate 10, is not easily eroded by external rainwater and sandstorms due to the protection of the cover plate 10, thus slowing down the aging rate of the second sealing gasket 9, thereby ensuring the long-term stability of the seal at the upper end of the porcelain sleeve 3, and ensuring the long-term stability of the overall sealing effect of the secondary porcelain sleeve 3 structure.

[0034] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0035] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A secondary porcelain bushing structure for a voltage transformer, comprising a terminal block (1), a first sealing washer (2), a porcelain bushing (3), and a first locking nut (4), characterized in that: It also includes a mounting base (5) and a sealing sleeve (6). The mounting base (5) is fixedly connected to the outer wall of the voltage transformer housing. The terminal (1) is inserted into the mounting base (5) with its upper end protruding out of the mounting base (5). The flexible sealing sleeve (6) is fitted onto the terminal (1) with its lower end inserted into the mounting base (5). The first sealing gasket (2) is fitted onto the sealing sleeve (6) and is attached to the outside of the sealing sleeve (6). With an interference fit, the porcelain sleeve (3) is fitted on the terminal (1) and located above the sealing sleeve (6). The first locking nut (4) is screwed onto the terminal (1) and pushes the porcelain sleeve (3) downward along the axial direction of the terminal (1), so that the porcelain sleeve (3) is tightly pressed against the sealing sleeve (6), and the porcelain sleeve (3) presses the first sealing gasket (2) onto the mounting base (5), so that the first sealing gasket (2) is embedded in the protective groove (31) formed at the lower end of the porcelain sleeve (3).

2. The secondary porcelain bushing structure of the voltage transformer according to claim 1, characterized in that: An insulating pad (7) is fitted on the lower end of the terminal block (1), and a second locking nut (8) located below the insulating pad (7) is screwed onto the lower end of the terminal block (1). The second locking nut (8) cooperates with the first locking nut (4) to make the insulating pad (7) press tightly against the inner wall of the mounting base (5).

3. The secondary porcelain bushing structure of the voltage transformer according to claim 2, characterized in that: The insulating pad (7) and the porcelain sleeve (3) are respectively provided with a first positioning hole (71) and a second positioning hole (32) that match the sealing sleeve (6). The lower end and the upper end of the sealing sleeve (6) are respectively inserted into the first positioning hole (71) and the second positioning hole (32).

4. The secondary porcelain bushing structure of the voltage transformer according to claim 2, characterized in that: The insulating pad (7) is fan-shaped, and a limiting groove (52) matching the insulating pad (7) is formed in the mounting base (5), and the insulating pad (7) is held in the limiting groove (52).

5. The secondary porcelain bushing structure of the voltage transformer according to claim 1, characterized in that: The mounting base (5) has a raised ring (51) formed on its upper end, and the first sealing gasket (2) is tightly pressed against the upper end of the raised ring (51).

6. The secondary porcelain bushing structure of the voltage transformer according to claim 5, characterized in that: The ceramic sleeve (3) has a relief groove (33) opposite to the convex ring (51). The convex ring (51) squeezes the first sealing gasket (2) so that the first sealing gasket (2) deforms and gets stuck in the relief groove (33).

7. The secondary porcelain bushing structure of the voltage transformer according to claim 1, characterized in that: The terminal block (1) is fitted with a second sealing washer (9) and a cover plate (10) located between the porcelain sleeve (3) and the first locking nut (4). The cover plate (10) presses the second sealing washer (9) onto the porcelain sleeve (3) by the action of the first locking nut (4).

8. The secondary porcelain bushing structure of the voltage transformer according to claim 7, characterized in that: The cover plate (10) is umbrella-shaped with its opening facing downwards and encloses the second sealing gasket (9) inside.

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