Pole-mounted circuit breaker shell sealing device

Abstract

The utility model discloses a pole-mounted circuit breaker shell sealing device, and relates to the technical field of electric power equipment sealing. The circuit breaker comprises a turnover mechanism, the output end of the turnover mechanism is provided with a circuit breaker body, and the top of the circuit breaker body is provided with a sealing groove. An elastic sealing assembly is arranged in an inner cavity of the circuit breaker body shell and comprises a first rotating shaft movably connected to the inner cavity of the circuit breaker body shell through a bearing seat, a first bevel gear fixedly connected with the surface of the first rotating shaft and a second bevel gear meshed with the surface of the first bevel gear. A plurality of groups of cams are driven by a symmetrically-arranged double-bevel-gear transmission system, the circumferential uniform pressure application of the sealing ring is realized, the involute profile of the cam ensures the linear propulsion of the ejector block, the sealing ring obtains accurate and controllable radial compression amount, the pressure gradient caused by traditional single-point compression is eliminated, and the pressure uniformity of a sealing interface is improved.

Description

Technical Field

[0001] This utility model belongs to the field of power equipment sealing technology, and in particular relates to a sealing device for the housing of a pole-mounted circuit breaker. Background Technology

[0002] A circuit breaker is a switching device that can close, carry, and interrupt current under normal circuit conditions, and can carry and interrupt current under abnormal circuit conditions (including short circuit conditions) within a specified time. A pole-mounted circuit breaker is a circuit breaker installed and operated on a power pole during the construction of transmission lines. It is mainly used for the segmented switching, control, and protection of transmission and distribution line sections. As an important protective device in the power system, the sealing performance of the pole-mounted circuit breaker's casing directly affects the reliability of its operation in complex outdoor environments.

[0003] Traditional sealing structures often employ fixed compression sealing rings, relying on the static pressure during housing assembly to achieve a seal. However, long-term exposure to temperature changes, mechanical vibrations, and material aging can cause permanent compression deformation of the sealing rings, leading to a drop in pressure at the sealing interface and subsequently causing problems such as water leakage and condensation. Particularly in coastal areas with high salt spray or industrial pollution, seal failure can accelerate the corrosion of internal components, increasing equipment failure rates. Furthermore, this structure has two significant drawbacks: firstly, the sealing strip is prone to stress relaxation after prolonged pressure, making it unable to maintain a constant contact pressure; secondly, the uneven local pressure caused by machining errors or assembly deviations at the housing parting surface cannot be adaptively compensated for, easily creating microscopic leakage channels.

[0004] To address these issues, we provide a pole-mounted circuit breaker housing sealing device. Utility Model Content

[0005] The purpose of this utility model is to provide a sealing device for the housing of a pole-mounted circuit breaker, which solves the problem of poor sealing performance of existing pole-mounted circuit breaker housing sealing devices by using a sealing ring and an elastic sealing component.

[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution.

[0007] This utility model is a sealing device for a pole-mounted circuit breaker housing, including a flipping mechanism, the output end of which is provided with a circuit breaker body, and the top of the circuit breaker body is provided with a sealing groove.

[0008] The inner cavity of the circuit breaker body housing is provided with an elastic sealing assembly. The elastic sealing assembly includes a first rotating shaft movably connected to the inner cavity of the circuit breaker body housing via a bearing seat, a first bevel gear fixedly connected to the surface of the first rotating shaft, a second bevel gear meshing with the surface of the first bevel gear, a second rotating shaft fixedly connected to the axis of the second bevel gear, a groove formed in the inner cavity of the sealing groove, and a top block disposed in the inner cavity of the groove.

[0009] The present invention is further provided that the inner cavity of the sealing groove is provided with a sealing ring, and the sealing ring is frame-shaped.

[0010] The present invention is further configured such that one end of the first rotating shaft extends through to the outside of the circuit breaker body housing and is fixedly connected to a driving bolt. There are two of the first rotating shaft and two of the second rotating shaft. The driving bolt is an internal hex bolt, which is fixedly connected to one end of the first rotating shaft. By rotating the driving bolt, the phase of the two cams can be controlled synchronously, so that the pressure at multiple positions can be adjusted by a single point operation.

[0011] The present invention is further configured such that a support block is fixedly connected to one side of the top block, and a push plate is fixedly connected to one side of the support block through the inner cavity of the circuit breaker body housing. One end of the support block is welded and fixed to the top block, and the other end is slidably connected to the push plate. This design enables the top block to maintain linear movement in the groove and avoids deflection and jamming.

[0012] The present invention is further configured such that cams are fixedly connected to the surfaces of the first rotating shaft and the second rotating shaft. The cams contact one side of the push plate. The cam profile is an involute shape. When the cam contacts the push plate at the maximum lift, it generates the maximum top pressure. The arrangement of the two rotating shafts makes the cams act symmetrically on both sides of the housing, ensuring that the sealing ring is pressurized evenly.

[0013] The present invention is further configured such that a spring is fixedly connected to one side of the push plate, and the other end of the spring is fixedly connected to the inner wall of the circuit breaker body housing. When the cam is reset, the spring pushes the push plate to reset, so that the top block is disengaged from the sealing ring, which facilitates the replacement operation.

[0014] The present invention is further configured such that the number of cams is the same as the number of top blocks, and they correspond one-to-one. The multi-point pressurization method effectively compensates for local deformation of the sealing ring and prevents leakage paths caused by uneven pressure distribution.

[0015] The present invention has the following beneficial effects.

[0016] 1. This utility model uses a symmetrically arranged double bevel gear transmission system to drive multiple sets of cams, thereby achieving uniform circumferential pressure on the sealing ring. The involute profile of the cams ensures linear advancement of the top block, enabling the sealing ring to obtain a precise and controllable radial compression, eliminating the pressure gradient caused by traditional single-point pressing, and improving the pressure uniformity of the sealing interface.

[0017] 2. This utility model utilizes the coordinated action of a pre-tightening spring and a cam in the elastic sealing assembly. When the sealing ring shrinks in volume due to aging, the spring releases its stored energy to push the push plate, causing the top block to continuously follow and compensate, maintaining a constant sealing pressure. This structure can maintain an effective seal even when the sealing ring thickness decreases, thus extending its service life.

[0018] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0020] Figure 1 This is a perspective view of a sealing device for a pole-mounted circuit breaker housing.

[0021] Figure 2 This is an exploded view of the sealing groove and sealing ring in a sealing device for a pole-mounted circuit breaker housing.

[0022] Figure 3 This is a cross-sectional view of the circuit breaker body housing of a pole-mounted circuit breaker housing sealing device.

[0023] Figure 4 This is a diagram showing the fit between the first and second bevel gears in a sealing device for a pole-mounted circuit breaker housing.

[0024] Figure 5 This is a diagram showing the fit between a cam and a push plate in a sealing device for a pole-mounted circuit breaker housing.

[0025] In the attached diagram: 1. Tilting mechanism; 2. Circuit breaker body; 3. Sealing groove; 4. First rotating shaft; 5. First bevel gear; 6. Second bevel gear; 7. Second rotating shaft; 8. Groove; 9. Top block; 10. Sealing ring; 11. Drive bolt; 12. Support block; 13. Cam; 14. Spring; 15. Push plate. Detailed Implementation

[0026] The technical solutions of the present utility model will be described below with reference to the accompanying drawings. The described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0027] Example 1

[0028] Please see Figures 1-5This utility model is a sealing device for a pole-mounted circuit breaker housing, including a flipping mechanism 1, a circuit breaker body 2 at the output end of the flipping mechanism 1, a sealing groove 3 at the top of the circuit breaker body 2, and an elastic sealing assembly in the inner cavity of the circuit breaker body 2 housing. The elastic sealing assembly includes a first rotating shaft 4 movably connected to the inner cavity of the circuit breaker body 2 housing via a bearing seat, a first bevel gear 5 fixedly connected to the surface of the first rotating shaft 4, a second bevel gear 6 meshing with the surface of the first bevel gear 5, a second rotating shaft 7 fixedly connected to the axis of the second bevel gear 6, a groove 8 opened in the inner cavity of the sealing groove 3, and a top block 9 disposed in the inner cavity of the groove 8.

[0029] Further details: The flipping mechanism 1 (existing technology) mainly drives the circuit breaker body 2 to rotate 180 degrees via a flipping motor, facilitating the installation of the corresponding sealing ring 10. Therefore, the sealing ring 10 has positioning holes on its surface to facilitate precise positioning. The second rotating shaft 7 is movably connected to the inner cavity of the housing through a bearing seat to ensure the stability of the second rotating shaft 7 during rotation. It adopts a split top block 9 and adjustable drive bolt 11 structure. During maintenance, only the drive bolt 11 needs to be rotated to simultaneously retract all the top blocks 9, realizing the replacement of the sealing ring 10 and improving maintenance efficiency.

[0030] Example 2

[0031] Please see Figures 1-5 Based on embodiment 1, a sealing ring 10 is provided in the inner cavity of the sealing groove 3. The sealing ring 10 is frame-shaped. One end of the first rotating shaft 4 extends through to the outside of the circuit breaker body 2 housing and is fixedly connected to a drive bolt 11. There are two of each of the first rotating shaft 4 and the second rotating shaft 7. A support block 12 is fixedly connected to one side of the top block 9. One side of the support block 12 extends through to the inner cavity of the circuit breaker body 2 housing and is fixedly connected to a push plate 15. Cams 13 are fixedly connected to the surfaces of both the first rotating shaft 4 and the second rotating shaft 7. The cams 13 are in contact with one side of the push plate 15. A spring 14 is fixedly connected to one side of the push plate 15. The other end of the spring 14 is fixedly connected to the inner wall of the circuit breaker body 2 housing. The number of cams 13 is the same as the number of top blocks 9 and they correspond one-to-one.

[0032] Further details: The drive bolt 11 is an internal hexagon bolt, fixedly connected to one end of the first rotating shaft 4. By rotating the drive bolt 11, the phase of the two cams 13 can be controlled synchronously, enabling single-point operation to adjust the pressure at multiple positions. One end of the support block 12 is welded and fixed to the top block 9, and the other end is slidably connected to the push plate 15. This design ensures that the top block 9 maintains linear movement within the groove 8, avoiding deflection and jamming. The cam 13 has an involute profile, generating maximum pressure when it contacts the push plate 15 at its maximum lift. The dual-shaft arrangement ensures that the cam 13 acts symmetrically on both sides of the housing, ensuring uniform pressure on the sealing ring 10. When the cam 13 resets, the spring 14 pushes the push plate 15 to reset, causing the top block 9 to disengage from the sealing ring 10, facilitating replacement. There are several top blocks 9, evenly distributed along the circumference of the sealing groove 3. The multi-point pressurization method effectively compensates for local deformation of the sealing ring 10 and prevents leakage paths caused by uneven pressure distribution.

[0033] The working principle of this utility model is as follows: When assembling the housing, the operator uses a hex wrench to rotate the drive bolt 11, which drives the first rotating shaft 4 to rotate. The first rotating shaft 4 drives the first bevel gear 5 to rotate, and the first bevel gear 5 drives the second bevel gear 6 to rotate. The symmetrical bevel gear transmission ensures the synchronous pressing of multiple positions and avoids sealing failure caused by unilateral force. The second bevel gear 6 drives the second rotating shaft 7 to rotate synchronously. The cams 13 on the first rotating shaft 4 and the second rotating shaft 7 gradually push the push plate 15 as they rotate. The top block 9 is pushed out of the groove 8 through the support block 12, which generates radial compression on the sealing ring 10. After being squeezed, the sealing ring 10 expands outward and tightly fits the mating surface between the top cover and the housing.

[0034] The multi-point pressurization method effectively compensates for the local deformation of the sealing ring 10 and prevents leakage paths caused by uneven pressure distribution. When the cam 13 is in the maximum lift position, the spring 14 is compressed and stores energy, and the top block 9 continuously applies pre-tightening force to compensate for the deformation loss of the sealing ring 10 due to aging, thereby realizing stepless adjustment of sealing pressure and keeping the sealing ring 10 at the optimal compression.

[0035] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A pole-mounted circuit breaker housing seal apparatus comprising a flipper mechanism (1), characterized by: The output end of the flipping mechanism (1) is provided with a circuit breaker body (2), and the top of the circuit breaker body (2) is provided with a sealing groove (3); The inner cavity of the circuit breaker body (2) is provided with an elastic sealing assembly. The elastic sealing assembly includes a first rotating shaft (4) movably connected to the inner cavity of the circuit breaker body (2) via a bearing seat, a first bevel gear (5) fixedly connected to the surface of the first rotating shaft (4), a second bevel gear (6) meshing with the surface of the first bevel gear (5), a second rotating shaft (7) fixedly connected to the axis of the second bevel gear (6), a groove (8) opened in the inner cavity of the sealing groove (3), and a top block (9) provided in the inner cavity of the groove (8).

2. A seal for a circuit breaker housing, as defined in claim 1, wherein: The sealing groove (3) is provided with a sealing ring (10), which is frame-shaped.

3. A seal for a circuit breaker housing, as defined in claim 1, wherein: One end of the first rotating shaft (4) extends through to the outside of the circuit breaker body (2) housing and is fixedly connected with a drive bolt (11). There are two of the first rotating shaft (4) and two of the second rotating shaft (7).

4. The pole-mounted circuit breaker housing sealing device according to claim 1, characterized in that: A support block (12) is fixedly connected to one side of the top block (9), and a push plate (15) is fixedly connected to one side of the support block (12) through the inner cavity of the circuit breaker body (2).

5. A molded housing seal for a pole-mounted circuit breaker according to claim 4, wherein: The first rotating shaft (4) and the second rotating shaft (7) are both fixedly connected with cams (13), and the cams (13) are in contact with one side of the push plate (15).

6. A molded housing seal for a pole-mounted circuit breaker according to claim 4, wherein: A spring (14) is fixedly connected to one side of the push plate (15), and the other end of the spring (14) is fixedly connected to the inner wall of the circuit breaker body (2) housing.

7. A molded case circuit breaker housing seal apparatus as defined in claim 5, wherein: The number of cams (13) is the same as the number of top blocks (9), and they correspond one-to-one.

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