Epoxy resin impregnated paper dry-type large-current bushing capable of being horizontally installed

Abstract

The utility model discloses an epoxy resin impregnated paper dry-type large-current bushing capable of being installed horizontally, which comprises a capacitor core body provided with a clamping table, a bushing flange is sleeved outside the capacitor core body, the bottom end face of the bushing flange is supported on the clamping table of the capacitor core body, and the bushing flange is in sealing fit with the capacitor core body through a sealing ring. An end face inner hole is formed in the side, close to the capacitor core body, of the sleeve flange, the outer wall, located on the top of the sleeve flange, of the capacitor core body is sleeved with a porcelain bushing in a sealed mode, the bottom of the porcelain bushing is embedded in the end face inner hole of the sleeve flange, a large-current conductor is installed in the capacitor core body, and a gland is elastically installed at the bottom of the large-current conductor. An inner hole step is arranged on the outer side of the top of the large-current conductor, the top end face of the capacitor core and the top end face of the porcelain sleeve are both embedded in the inner hole step in a limiting mode, the gland is in pressing fit with the bottom of the capacitor core, stability and reliability are improved, and sealing failure caused by displacement generated by horizontal installation is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of current bushings, in particular to an epoxy resin-impregnated paper dry-type high-current bushing which can be installed horizontally. Background Art

[0002] Currently, existing high-current bushings are primarily oil-paper capacitor and pure porcelain types, and most are installed vertically. Pure porcelain high-current bushings simply use a porcelain sleeve wrapped around the conductor. Since they lack internal insulation and rely on transformer oil for insulation, the electric field strength is uneven and prone to breakdown in areas with concentrated electric fields. Oil-paper capacitor high-current bushings use cable paper and aluminum foil wound around the surface of the conductor to create a capacitive voltage divider. An upper porcelain sleeve, flange, lower porcelain sleeve, and metal plate on the oil end are then used to create a sealed space. Transformer oil is then injected into this cavity. Due to thermal expansion and contraction of transformer oil, users must provide their own hose at the upper end of the bushing to compensate for the transformer oil. Furthermore, when the bushing is installed horizontally, gravity can cause seal failure and other issues, posing a safety hazard to high-current bushings. Utility Model Content

[0003] The utility model provides a horizontally installable epoxy resin impregnated paper dry type high current bushing, which aims to solve the problem of seal failure caused by displacement between the porcelain sleeve and the conductor during horizontal installation of the existing high current bushing.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] A horizontally installable epoxy resin impregnated paper dry-type high-current bushing comprises a capacitor core provided with a clamping platform, a bushing flange is concentrically and coaxially sleeved on the outside of the capacitor core, the bottom end face of the bushing flange is supported on the clamping platform of the capacitor core, and the bushing flange forms a sealed fit with the capacitor core through a sealing ring, the bushing flange is provided with an end face inner hole on the side close to the capacitor core, the outer wall of the capacitor core located at the top of the bushing flange is sealed with a porcelain sleeve, the bottom of the porcelain sleeve is embedded in the end face inner hole of the bushing flange, the top end face of the porcelain sleeve is flush with the top end face of the capacitor core, a high-current conductor is installed in the capacitor core, a pressure cover is elastically installed on the bottom of the high-current conductor, an inner hole step is provided on the top outer side of the high-current conductor, the top end face of the capacitor core and the top end face of the porcelain sleeve are both limitedly embedded in the inner hole step, and the pressure cover forms a tight fit with the bottom of the capacitor core.

[0006] Preferably, a third planar sealing ring is concentrically and coaxially provided on the clamping platform of the capacitor core, and the bottom end face of the sleeve flange forms a sealing fit with the clamping platform of the capacitor core through the third planar sealing ring, and a plurality of second O-rings are provided between the inner wall of the sleeve flange and the outer wall of the capacitor core, and the inner wall of the sleeve flange forms a sealing fit with the outer wall of the capacitor core through the second O-rings.

[0007] More preferably, there are at least two second O-rings, all of which are arranged concentrically and coaxially with the capacitor core, and are arranged at equal intervals along the axial direction.

[0008] Furthermore, insulating paste is filled between the capacitor core and the porcelain sleeve.

[0009] Furthermore, a measuring terminal is provided on one side of the sleeve flange, and a measuring end of the measuring terminal is connected to a porcelain sleeve in an inner hole of the end face.

[0010] Specifically, a lead wire is led out from the tail end of the capacitor core, and the lead wire is fixed to the high-current conductor through a cross pan head screw.

[0011] More specifically, a second planar sealing ring is coaxially and concentrically provided inside the inner hole step of the large current conductor, and the second planar sealing ring corresponds to the top end face of the porcelain sleeve. The top end face of the porcelain sleeve forms a sealing fit with the inner hole step of the large current conductor through the second planar sealing ring. A sealant is provided between the outer side of the inner hole step and the outer wall of the porcelain sleeve, and the outer side of the inner hole step forms a sealing fit with the outer wall of the porcelain sleeve through the sealant. A first O-ring is coaxially and concentrically provided on the outer wall of the large current conductor close to the inner hole step, and the top of the inner wall of the capacitor core forms a sealing fit with the outer wall of the large current conductor through the first O-ring.

[0012] In detail, the bottom of the large current conductor is fixedly installed with a pressure cover by a second hexagonal head bolt, and a disc spring is provided between the nut of the second hexagonal head bolt and the pressure cover. The pressure cover forms an elastic limiting fit with the nut of the second hexagonal head bolt through the disc spring, and the pressure cover forms a tight fit with the bottom end of the capacitor core.

[0013] In more detail, a fourth planar sealing ring is provided between the gland and the bottom end of the capacitor core, and the gland forms a sealed fit with the bottom end of the capacitor core through the fourth planar sealing ring.

[0014] Preferably, a metal washer is coaxially and concentrically provided at the middle position of the top end of the large current conductor, a first planar sealing ring is coaxially and concentrically provided on the top of the metal washer, and both the first planar sealing ring and the metal washer are penetrated by a first hexagonal head bolt to form a fixed fit with the large current conductor.

[0015] Beneficial effects of the utility model:

[0016] The utility model achieves more stable and reliable sealing and mechanical performance between the flange, conductor and porcelain sleeve through the installation method of the two. The flange and the porcelain sleeve, as well as the conductor and the end face of the porcelain sleeve are designed as an inner hole step insertion installation structure. The flat sealing ring is compressed by the disc spring force to achieve sealing, avoiding the problem of seal failure caused by displacement of the horizontally installed porcelain sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front view of a half-section of the utility model;

[0018] Figure 2 For the utility model Figure 1 An enlarged schematic diagram of the inner hole step in FIG;

[0019] In the figure: 1. High-current conductor; 2. First hexagonal bolt; 3. First flat sealing ring; 4. Second flat sealing ring; 5. First O-ring; 6. Insulating paste; 7. Capacitor core; 8. Porcelain sleeve; 9. Measuring terminal; 10. Bushing flange; 11. Second O-ring; 12. Third flat sealing ring; 13. Fourth flat sealing ring; 14. Gland; 15. Disc spring; 16. Second hexagonal bolt; 17. Lead wire; 18. Cross pan head screw; 19. Sealant; 20. Metal washer. DETAILED DESCRIPTION

[0020] As follows, embodiments are further described with reference to the accompanying drawings.

[0021] like Figure 1~Figure 2 As shown in FIG. 1 , as a preferred embodiment 1, a horizontally mountable epoxy resin impregnated paper dry-type high current bushing comprises a capacitor core 7 provided with a clamping platform, a bushing flange 10 is coaxially sleeved on the outside of the capacitor core 7, the bottom end face of the bushing flange 10 is supported on the clamping platform of the capacitor core 7, and the bushing flange 10 forms a sealing fit with the capacitor core 7 through a sealing ring, the bushing flange 10 is provided with an end face inner hole on the side close to the capacitor core 7, and the outer end face of the capacitor core 7 located at the top of the bushing flange 10 is provided with a A porcelain sleeve 8 is sealed against the wall, the bottom of the porcelain sleeve 8 is embedded in the inner hole of the end face of the sleeve flange 10, the top end face of the porcelain sleeve 8 is flush with the top end face of the capacitor core 7, a large current conductor 1 is installed in the capacitor core 7, a pressure cover 14 is elastically installed on the bottom of the large current conductor 1, an inner hole step is provided on the top outer side of the large current conductor 1, the top end face of the capacitor core 7 and the top end face of the porcelain sleeve 8 are both limitedly embedded in the inner hole step, and the pressure cover 14 forms a tight fit with the bottom of the capacitor core 7.

[0022] The elastically mounted pressure cap 14 provides axial pressure to press the capacitor core 7 into the inner hole step of the large current conductor 1. The clamping platform of the electric core 7 provides pressure to the sleeve flange 10 under the action of the pressure cap 14. The sleeve flange 10 provides pressure to the porcelain sleeve 8, thereby pressing the porcelain sleeve 8 into the inner hole step of the large current conductor 1, improving the stability and reliability of the porcelain sleeve 8 when installed horizontally, avoiding displacement and causing sealing failure. The sleeve flange 10 improves the stability of the porcelain sleeve 8 when installed horizontally through the inner hole of the end face.

[0023] A third planar sealing ring 12 is concentrically and coaxially provided on the clamping platform of the capacitor core 7, and the bottom end face of the sleeve flange 10 forms a sealing fit with the clamping platform of the capacitor core 7 through the third planar sealing ring 12. A plurality of second O-rings 11 are provided between the inner wall of the sleeve flange 10 and the outer wall of the capacitor core 7, and the inner wall of the sleeve flange 10 forms a sealing fit with the outer wall of the capacitor core 7 through the second O-rings 11, thereby ensuring the sealed installation of the sleeve flange 10 and the capacitor core 7.

[0024] There are at least two second O-shaped sealing rings 11 , and the second O-shaped sealing rings 11 are all arranged concentrically and coaxially with the capacitor core 7 . The second O-shaped sealing rings 11 are arranged at equal intervals along the axial direction to ensure sealing stability.

[0025] The space between the capacitor core 7 and the porcelain sleeve 8 is filled with insulating paste 6, which is punched into the space between the capacitor core 7 and the porcelain sleeve 8 through the sleeve flange 10 for auxiliary insulation.

[0026] A measuring terminal 9 is provided on one side of the sleeve flange 10 , and a measuring end of the measuring terminal 9 is connected to the porcelain sleeve 8 in the inner hole of the end face for easy detection.

[0027] A lead 17 is led out from the tail end of the capacitor core 7, and the lead 17 is fixed to the high-current conductor 1 by a cross pan head screw 18 to ensure normal use, which is a conventional arrangement method.

[0028] A second planar sealing ring 4 is coaxially and concentrically provided in the inner hole step of the large current conductor 1, and the second planar sealing ring 4 corresponds to the top end face of the porcelain sleeve 8. The top end face of the porcelain sleeve 8 forms a sealing fit with the inner hole step of the large current conductor 1 through the second planar sealing ring 4, ensuring the sealing fit of the porcelain sleeve 8 and the inner hole step of the large current conductor 1. A sealant 19 is provided between the outer side of the inner hole step and the outer wall of the porcelain sleeve 8, and the outer side of the inner hole step forms a sealing fit with the outer wall of the porcelain sleeve 8 through the sealant 19, further ensuring the sealing fit of the porcelain sleeve 8 and the inner hole step of the large current conductor 1. The sealing fit of the step is achieved by applying sealant 19 to the connection between the porcelain sleeve 8 and the sleeve flange 10 as well as the porcelain sleeve 8 and the large current conductor 1, thereby further improving the sealing reliability of the two ends of the porcelain sleeve 8 and playing a buffering role after a slight displacement of the porcelain sleeve 8 during horizontal installation, thereby ensuring the sealing. A first O-ring 5 is concentrically and coaxially sleeved on the outer wall of the large current conductor 1 near the inner hole step, and the top of the inner wall of the capacitor core 7 forms a sealing fit with the outer wall of the large current conductor 1 through the first O-ring 5, thereby ensuring the sealing fit between the large current conductor 1 and the capacitor core 7.

[0029] The bottom of the high-current conductor 1 is fixedly installed with a pressure cover 14 by a second hexagonal head bolt 16, and a disc spring 15 is provided between the nut of the second hexagonal head bolt 16 and the pressure cover 14. The pressure cover 14 forms an elastic limiting fit with the nut of the second hexagonal head bolt 16 through the disc spring 15, and the pressure cover 14 forms a tight fit with the bottom end of the capacitor core 7. The second hexagonal head bolt 16 ensures the limited installation of the pressure cover 14, and the disc spring 15 provides pressure to make the pressure cover 14 press the capacitor core 7.

[0030] A fourth planar sealing ring 13 is provided between the gland 14 and the bottom end of the capacitor core 7, and the gland 14 forms a sealed fit with the bottom end of the capacitor core 7 through the fourth planar sealing ring 13. A second hexagonal head bolt 16 is inserted into the disc spring 15 and tightened to the large current conductor 1 through the mounting hole on the gland 14. The compression height of the disc spring 15 is adjusted to ensure the force on the sleeve. The length change between the large current conductor 1 and the capacitor core 7 after the temperature limit changes is calculated, and the sealing performance of the sleeve is ensured by the stroke of the disc spring 15.

[0031] A metal washer 20 is coaxially and concentrically provided at the middle position of the top of the high-current conductor 1, and a first planar sealing ring 3 is coaxially and concentrically provided on the top of the metal washer 20. The first planar sealing ring 3 and the metal washer 20 are both penetrated by the first hexagonal bolt 2 and fixedly matched with the high-current conductor 1 to ensure use.

[0032] The working principle of this utility model:

[0033] The utility model provides axial pressure through the elastically installed pressure cover 14, pressing the capacitor core 7 tightly into the inner hole step of the large current conductor 1. The clamping platform of the electric core 7 provides pressure to the sleeve flange 10 under the action of the pressure cover 14. The sleeve flange 10 provides pressure to the porcelain sleeve 8, thereby pressing the porcelain sleeve 8 into the inner hole step of the large current conductor 1, improving the stability and reliability of the porcelain sleeve 8 under horizontal installation, and avoiding displacement and resulting in sealing failure.

Claims

1. A horizontally mountable epoxy resin impregnated paper dry-type high current bushing, comprising a capacitor core (7) provided with a clamping platform, characterized in that: The outer side of the capacitor core (7) is coaxially and concentrically sleeved with a sleeve flange (10), the bottom end face of the sleeve flange (10) is supported on the clamping table of the capacitor core (7), and the sleeve flange (10) forms a sealed fit with the capacitor core (7) through a sealing ring, the sleeve flange (10) is provided with an end face inner hole on the side close to the capacitor core (7), the outer wall of the capacitor core (7) located at the top of the sleeve flange (10) is sealed with a porcelain sleeve (8), and the bottom of the porcelain sleeve (8) is embedded in the sleeve flange. In the inner hole of the end face of the flange (10), the top end face of the porcelain sleeve (8) is flush with the top end face of the capacitor core (7), a large current conductor (1) is installed in the capacitor core (7), a pressure cover (14) is elastically installed at the bottom of the large current conductor (1), an inner hole step is provided on the top outer side of the large current conductor (1), the top end face of the capacitor core (7) and the top end face of the porcelain sleeve (8) are both limitedly embedded in the inner hole step, and the pressure cover (14) forms a tight fit with the bottom of the capacitor core (7).

2. The horizontally installable epoxy resin impregnated paper dry type high current bushing according to claim 1, characterized in that: A third planar sealing ring (12) is coaxially and concentrically provided on the clamping platform of the capacitor core (7), and the bottom end surface of the sleeve flange (10) forms a sealing fit with the clamping platform of the capacitor core (7) through the third planar sealing ring (12), and a plurality of second O-shaped sealing rings (11) are provided between the inner wall of the sleeve flange (10) and the outer wall of the capacitor core (7), and the inner wall of the sleeve flange (10) forms a sealing fit with the outer wall of the capacitor core (7) through the second O-shaped sealing rings (11).

3. The horizontally installable epoxy resin impregnated paper dry type high current bushing according to claim 2, characterized in that: There are at least two second O-shaped sealing rings (11), and the second O-shaped sealing rings (11) are all arranged concentrically and coaxially with the capacitor core (7), and the second O-shaped sealing rings (11) are arranged at equal intervals along the axial direction.

4. The horizontally installable epoxy resin impregnated paper dry type high current bushing according to claim 3, characterized in that: Insulating paste (6) is filled between the capacitor core (7) and the porcelain sleeve (8).

5. The horizontally installable epoxy resin impregnated paper dry type high current bushing according to claim 4, characterized in that: A measuring terminal (9) is provided on one side of the sleeve flange (10), and a measuring end of the measuring terminal (9) is connected to a porcelain sleeve (8) in an inner hole of the end face.

6. The horizontally installable epoxy resin impregnated paper dry type high current bushing according to claim 5, characterized in that: A lead wire (17) is led out from the tail end of the capacitor core (7), and the lead wire (17) is fixed to the high-current conductor (1) via a cross pan head screw (18).

7. The horizontally installable epoxy resin impregnated paper dry type high current bushing according to claim 6, characterized in that: A second planar sealing ring (4) is coaxially and concentrically provided inside the inner hole step of the large current conductor (1), and the second planar sealing ring (4) corresponds to the top end face of the porcelain sleeve (8). The top end face of the porcelain sleeve (8) forms a sealing fit with the inner hole step of the large current conductor (1) through the second planar sealing ring (4). A sealing glue (19) is provided between the outer side of the inner hole step and the outer wall of the porcelain sleeve (8), and the outer side of the inner hole step forms a sealing fit with the outer wall of the porcelain sleeve (8) through the sealing glue (19). A first O-shaped sealing ring (5) is coaxially and concentrically provided on the outer wall of the large current conductor (1) near the inner hole step, and the top of the inner wall of the capacitor core (7) forms a sealing fit with the outer wall of the large current conductor (1) through the first O-shaped sealing ring (5).

8. The horizontally installable epoxy resin impregnated paper dry type high current bushing according to claim 7, characterized in that: The bottom of the high-current conductor (1) is fixedly mounted with a pressure cover (14) via a second hexagonal bolt (16), and a disc spring (15) is provided between the nut of the second hexagonal bolt (16) and the pressure cover (14). The pressure cover (14) forms an elastic limiting fit with the nut of the second hexagonal bolt (16) via the disc spring (15), and the pressure cover (14) forms a press fit with the bottom end of the capacitor core (7).

9. The horizontally installable epoxy resin impregnated paper dry type high current bushing according to claim 8, characterized in that: A fourth planar sealing ring (13) is provided between the pressure cover (14) and the bottom end of the capacitor core (7), and the pressure cover (14) forms a sealed fit with the bottom end of the capacitor core (7) through the fourth planar sealing ring (13).

10. The horizontally installable epoxy resin impregnated paper dry type high current bushing according to claim 9, characterized in that: A metal washer (20) is coaxially and concentrically provided at the middle position of the top end of the high-current conductor (1), a first planar sealing ring (3) is coaxially and concentrically provided at the top end of the metal washer (20), and both the first planar sealing ring (3) and the metal washer (20) are penetrated by a first hexagonal bolt (2) to form a fixed fit with the high-current conductor (1).

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