Double-sealing structure for root of capacitor bushing

Abstract

The utility model discloses a capacitor bushing root double-sealing structure, and belongs to the technical field of capacitor bushing root sealing. The sealing structure comprises a capacitor bushing body, a sealing gasket group and a root flange, the sealing gasket group is arranged between the outer wall of the capacitor bushing body and the inner wall of the root flange, and the root flange sleeves the capacitor bushing body; the root flange comprises a first end body, a middle body and a second end body, and the first end body, the middle body and the second end body are of an integrated structure. According to the root flange, the first end body, the middle body and the second end body are of the integrated structure, installation is easy and convenient, compared with a two-section type flange, the integrated structure is more uniform in stress and not prone to damage, the structure is simple, the structure is compact, and the service life of the root flange is prolonged. And the second sealing gasket and the first sealing gasket are matched with the root flange to form a double-sealing structure, so that the problem of unreliability caused by failure of single-time sealing of the root is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of capacitor bushing root sealing, and more specifically to a capacitor bushing root double sealing structure. Background Art

[0002] The existing casing root is composed of three major parts: the root flange, the sealing gasket, and the porcelain sleeve. When the porcelain part and the flange are rolled, an auxiliary epoxy glue is needed to stick the buffer, and the sealing ring is rolled and pressed to achieve the sealing effect.

[0003] Since the production process of the porcelain sleeve is to burn ceramics, its size has a large dispersion, and the root flange on the outside of the porcelain sleeve is stamped by a mold, so the size accuracy is relatively high. When the porcelain sleeve with poor accuracy is combined with the root flange with high accuracy, the gap between the two (where the sealing gasket is placed) is not controlled, the deformation of the sealing gasket is not controlled, and the sealing effect of the porcelain sleeve cannot be guaranteed. In addition, since the sealing structure of the root flange of the capacitor bushing is in a process blind spot, the deformation consistency of the sealing gasket section is different. Due to the high swelling characteristics of the sealing gasket in the part where the deformation does not meet the design requirements, swelling micro-seepage occurs during the operation of the capacitor bushing, causing micro-seepage of the insulating oil in the capacitor box. Therefore, our company's R&D personnel proposed a double sealing structure at the root of the capacitor bushing in the early stage, with the announcement number CN219105929U. A sealing boss and a conical slope are set at the root of the capacitor bushing to be sealed, and then a layer of sealing gasket is wrapped on the outside of the sealing boss and the conical slope respectively. The two layers of sealing gaskets are stacked to form a double sealing structure at the root of the capacitor bushing, thereby solving the unreliable problem of the existing single-layer seal that is prone to failure. At the same time, the double-layer sealing structure is adopted to improve the sealing effect and solve the problem of micro-seepage of insulating oil in the capacitor box caused by micro-seepage of swelling during the operation of the capacitor bushing. The sealing structure is composed of two flanges, but the R&D personnel found that the sealing structure is not convenient enough. For example, when the two flanges are connected, a process is added. The two flanges are connected by welding, and the connection will also be damaged due to force, affecting the sealing effect. In view of this, we proposed a double sealing structure at the root of the capacitor bushing. Utility Model Content

[0004] The utility model aims to provide a double sealing structure at the root of a capacitor bushing to solve the problems raised in the above-mentioned background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A capacitor bushing root double sealing structure, comprising a capacitor bushing body, a sealing gasket group and a root flange, wherein the sealing gasket group is arranged between the outer wall of the capacitor bushing body and the inner wall of the root flange, and the root flange is sleeved on the capacitor bushing body;

[0007] The root flange comprises a first end body, an intermediate body and a second end body, and the first end body, the intermediate body and the second end body are an integrated structure;

[0008] The intermediate body comprises a first convex portion, an inclined portion and a wave portion, wherein the inclined portion is located between the first convex portion and the wave portion.

[0009] Preferably, one end of the first protrusion is connected to the first end body, and the other end of the first protrusion is connected to the inclined portion;

[0010] The sealing gasket group comprises a first sealing gasket and a second sealing gasket, wherein the first sealing gasket is located on the first protruding portion and the inclined portion; and the second sealing gasket is located on the second end body.

[0011] Preferably, the cross section of the first protrusion is an arc structure protruding toward the inner side of the capacitor bushing body, and the connection between the first protrusion and the inclined portion is an arc structure concave toward the outer side.

[0012] Preferably, the wave portion includes a second convex portion, a concave portion and a third convex portion, the inclined portion is connected to the second convex portion, and the concave portion is located between the second convex portion and the third convex portion.

[0013] Preferably, the cross section of the second end body is an L-shaped structure, and the second sealing gasket is located on the top surface of the horizontal portion of the second end body and extends to the bending portion of the second end body.

[0014] Preferably, the first end body and the inclined surface section have opposite inclination directions, and the inclined surface section is an inclined surface inclined outward and upward.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] The root flange of the utility model is arranged with a first end body, an intermediate body and a second end body as an integrated structure, and is easy to install. Compared with a two-stage flange, the root flange of the integrated structure is more evenly stressed, not easily damaged, and has a better sealing effect. The pressure reflected by the torque on the capacitor bushing body is small, and the probability of damage to the stress point of the capacitor bushing is small. In addition, a second sealing gasket and a first sealing gasket are used in cooperation with the root flange to form a double sealing structure, which solves the unreliability of single sealing failure at the root and realizes double sealing. It solves the problem of yellowing of insulating oil micro-seepage in the capacitor box caused by swelling micro-seepage during the operation of the capacitor bushing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the cross-sectional structure of the root flange of the utility model;

[0019] Explanation of the numbers in the figure: 1. capacitor bushing body; 2. root flange; 201. first end body; 202. first raised portion; 203. inclined portion; 204. second raised portion; 205. concave portion; 206. third raised portion; 207. second end body; 3. second sealing gasket; 4. first sealing gasket. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0021] Example:

[0022] See also Figure 1-2 A double sealing structure at the root of a capacitor bushing, comprising a capacitor bushing body 1, a sealing gasket group and a root flange 2, wherein the sealing gasket group is arranged between the outer wall of the capacitor bushing body 1 and the inner wall of the root flange 2, and the root flange 2 is sleeved on the capacitor bushing body 1; the root flange 2 is a circular cylindrical structure, and the bottom of the root flange 2 is in contact with the flange of the capacitor bushing body 1 near the bottom. When in use, after the sealing gasket group is installed on the root flange 2, the root flange 2 is sleeved into the boss edge at the root of the capacitor bushing body 1, and the root flange 2 is connected to the metal part. Among them, the root flange 2 is made of stainless steel.

[0023] The root flange 2 includes a first end body 201, an intermediate body and a second end body 207, and the first end body 201, the intermediate body and the second end body 207 are an integrated structure; the installation is convenient, the root flange 2 is evenly stressed, the torque reflects a small pressure on the capacitor bushing body 1, and the probability of damage to the stress point of the capacitor bushing is small.

[0024] The intermediate body includes a first raised portion 202, a chamfered portion 203 and a wave portion, wherein the chamfered portion 203 is located between the first raised portion 202 and the wave portion. The first raised portion 202 and the wave portion are provided to facilitate the root flange 2 to fit more closely to the capacitor bushing body 1 during installation.

[0025] In the present application, one end of the first protruding portion 202 is connected to the first end body 201 , and the other end of the first protruding portion 202 is connected to the inclined portion 203 .

[0026] The sealing gasket group includes a second sealing gasket 3 and a first sealing gasket 4. The second sealing gasket 3 is located on the first protrusion 202 and the inclined portion 203. The inclined portion 203 of the root flange 2 compresses the second sealing gasket 3 and the outer wall of the capacitor bushing body 1 to form a sealing effect. The first sealing gasket 4 is located on the second end body 207. The root flange 2 compresses the first sealing gasket 4 and the end of the capacitor bushing body 1 to form a sealing effect. The second sealing gasket 3 and the first sealing gasket 4 cooperate with the root flange 2 to form a double sealing structure, so that the sealing between the ceramic body at the root of the capacitor bushing body 1 and the metal part is strengthened, the sealing performance is better, no epoxy resin glue is needed, and there is no outflow of epoxy resin glue in the later stage; there is no rolling on the weak part of the conical table at the root of the capacitor bushing body 1, which increases the mechanical strength, makes the structure simpler, and makes the sealing more reliable.

[0027] In the present application, the cross section of the first protrusion 202 is an arc structure protruding toward the inside of the capacitor bushing body 1, and the connection between the first protrusion 202 and the inclined portion 203 is an arc structure concave toward the outside.

[0028] In the present application, the wave portion includes a second raised portion 204 , a concave portion 205 and a third raised portion 206 , the inclined portion 203 is connected to the second raised portion 204 , and the concave portion 205 is located between the second raised portion 204 and the third raised portion 206 .

[0029] In the present application, the cross-section of the second end body 207 is an L-shaped structure, including a vertical portion and a horizontal portion, and a bending portion where the vertical portion and the horizontal portion are connected, the bending portion is a rounded corner, and the first sealing gasket 4 is located on the top surface of the horizontal portion of the second end body 207 and extends to the bending portion of the second end body 207.

[0030] In the present application, the first end body 201 and the inclined surface 203 have opposite inclination directions, and the inclined surface 203 has an inclined surface that is inclined outward and upward. The outer end of the first end body 201 is inclined downward, and when the first end body 201 is subjected to an upward force, the second sealing gasket 3 is squeezed inward, and at the same time, the first protrusion 202 can prevent the second sealing gasket 3 from sliding outward.

[0031] When the root flange 2 is connected to the metal part, the root flange 2 is pushed upward, and the root flange 2 compresses the first sealing gasket 4 and the end of the capacitor bushing body 1 to form a first sealing effect. The inclined portion 203 of the root flange 2 compresses the second sealing gasket 3 and the bottom surface of the outer wall protrusion of the capacitor bushing body 1 to form a second sealing effect. Since the first end body 201, the intermediate body and the second end body 207 are designed as an integrated structure, it is easy to install, and compared with the two-stage flange, the root flange 2 of the integrated structure is more evenly stressed and not easy to be damaged. The pressure reflected by the torque on the capacitor bushing body 1 is small, and the probability of damage to the stress point of the capacitor bushing is small.

[0032] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A capacitor bushing root double sealing structure, comprising a capacitor bushing body (1), a sealing gasket assembly and a root flange (2), characterized in that: The sealing gasket assembly is arranged between the outer wall of the capacitor bushing body (1) and the inner wall of the root flange (2), and the root flange (2) is sleeved on the capacitor bushing body (1); The root flange (2) comprises a first end body (201), an intermediate body and a second end body (207), wherein the first end body (201), the intermediate body and the second end body (207) are an integrated structure; The intermediate body comprises a first convex portion (202), a sloped portion (203) and a waved portion, wherein the sloped portion (203) is located between the first convex portion (202) and the waved portion.

2. The double sealing structure at the root of a capacitor bushing according to claim 1, characterized in that: One end of the first protruding portion (202) is connected to the first end body (201), and the other end of the first protruding portion (202) is connected to the inclined portion (203); The sealing gasket group comprises a second sealing gasket (3) and a first sealing gasket (4); the second sealing gasket (3) is located on the first raised portion (202) and the inclined portion (203); and the first sealing gasket (4) is located on the second end body (207).

3. The double sealing structure at the root of a capacitor bushing according to claim 1, characterized in that: The cross section of the first protruding portion (202) is an arc structure protruding toward the inside of the capacitor bushing body (1), and the connection between the first protruding portion (202) and the inclined portion (203) is an arc structure concave toward the outside.

4. The double sealing structure at the root of a capacitor bushing according to claim 1, characterized in that: The wave portion comprises a second convex portion (204), a concave portion (205) and a third convex portion (206); the inclined portion (203) is connected to the second convex portion (204); and the concave portion (205) is located between the second convex portion (204) and the third convex portion (206).

5. The double sealing structure at the root of a capacitor bushing according to claim 2, characterized in that: The cross section of the second end body (207) is an L-shaped structure, and the first sealing pad (4) is located on the top surface of the horizontal part of the second end body (207) and extends to the bending part of the second end body (207).

6. The double sealing structure at the root of a capacitor bushing according to claim 1, characterized in that: The inclination directions of the cross sections of the first end body (201) and the inclined portion (203) are opposite, and the cross section of the inclined portion (203) is an inclined surface that inclines outward and upward.

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