Connection structure of pole and voltage sensor and circuit breaker

Abstract

The utility model discloses a connection structure of a pole and a voltage sensor and a circuit breaker, and belongs to the field of circuit breakers. The accommodating cavity and the threaded hole are formed in the pole and are communicated with each other; one end of the voltage sensor is in threaded connection with the threaded hole, so that the voltage sensor is electrically connected with the pole; the other end of the voltage sensor is sleeved with the sealing ring, and the outer side of the sealing ring abuts against the inner wall of the containing cavity; the voltage sensor and the sealing ring are both located in the containing cavity. The utility model has the technical effects that the electric connection performance of the pole and the voltage sensor is good, and the mechanical connection performance of the pole and the voltage sensor is good.

Description

Technical Field

[0001] The utility model relates to a circuit breaker, in particular to a connection structure between a pole column and a voltage sensor and a circuit breaker. Background Art

[0002] A circuit breaker is a switching device that can close, carry and interrupt the current under normal circuit conditions and can close, carry and interrupt the current under abnormal circuit conditions within a specified time. The pole column is an important part of the circuit breaker. In order to facilitate voltage detection, a voltage sensor is generally connected inside the relevant pole column.

[0003] Chinese invention patent, publication number: CN109904032A, publication date: June 18, 2019, discloses a new type of vacuum circuit breaker pole column, including a vacuum interrupter, an epoxy resin casting body, a flexible connection, an insulating pull rod assembly, a lower outgoing line, a current sensor, a secondary line of the mutual inductor, a voltage sensor, a capacitive energy extraction device, and a cover, which is integrally cast by the epoxy resin automatic pressure gel process APG. Compared with the traditional pole column structure, the setting of the voltage sensor and the current sensor is increased, and the current and voltage protection, measurement and metering equipment, and the capacitive energy extraction power supply equipment are deeply integrated with the vacuum interrupter, and the structural design is integrated; the protection function of the equipment is enhanced, and at the same time, the interactivity and relevance are improved. Its disadvantages are that external water vapor is easy to enter the cavity of the voltage sensor, which easily leads to poor electrical connection performance between the pole column and the voltage sensor. At the same time, the depth of the cavity of the voltage sensor is too large, it is difficult to install a gasket, and it easily leads to poor mechanical connection performance between the pole column and the voltage sensor. Summary of the Utility Model

[0004] Utility Model Purpose: The purpose of the present utility model is to provide a connection structure between a pole column and a voltage sensor, which not only makes the electrical connection performance between the pole column and the voltage sensor good, but also makes the mechanical connection performance between the pole column and the voltage sensor good; another purpose of the present utility model is to provide a circuit breaker.

[0005] Technical Solution: A connection structure between a pole column and a voltage sensor, comprising:

[0006] A pole column;

[0007] A cavity and a threaded hole both arranged inside the pole column, the cavity and the threaded hole being communicated;

[0008] A voltage sensor, one end of the voltage sensor being threadedly connected to the threaded hole so that the voltage sensor is electrically connected to the pole column;

[0009] A sealing ring sleeved outside the other end of the voltage sensor, the outer side of the sealing ring being in contact with the inner wall of the cavity;

[0010] Among them, the voltage sensor and the sealing ring are both located in the cavity.

[0011] Optionally, the voltage sensor includes a connecting portion, a first end portion, a sensor body, and a second end portion that are connected in sequence. Among them, the connecting portion is threadedly connected to the threaded hole so that the connecting portion is electrically connected to the pole column. The sealing ring is sleeved outside one end of the sensor body close to the second end portion. The connecting portion, the first end portion, the sensor body, and the second end portion are all located in the cavity.

[0012] Optionally, the axial length of the cavity is greater than the sum of the axial lengths of the first end portion, the sensor body, and the second end portion.

[0013] Optionally, the diameter of the second end portion is greater than the inner diameter of the sealing ring, the diameter of the second end portion is less than the outer diameter of the sealing ring, and one end of the second end portion close to the sensor body abuts against the sealing ring.

[0014] Optionally, the diameter of the sensor body is greater than the inner diameter of the sealing ring.

[0015] Optionally, the diameter of the second end portion is 52.5 - 53.5 mm.

[0016] Optionally, the material of the sealing ring is rubber.

[0017] A circuit breaker includes a connection structure between a pole column and a voltage sensor.

[0018] Beneficial effects: The sealing ring is used to increase the sealing performance between the voltage sensor and the cavity, prevent external water vapor from entering the cavity, thereby preventing external water vapor from entering the electrical connection part of the pole column and the voltage sensor, ensuring good electrical connection performance between the pole column and the voltage sensor, and further ensuring the reliability of the 10KV high-voltage connection between the pole column and the voltage sensor. The sealing ring is also used to prevent the voltage sensor from loosening from the inner wall of the cavity, thereby preventing the threaded connection part of the pole column and the voltage sensor from loosening, ensuring good mechanical connection performance between the pole column and the voltage sensor, and further ensuring the reliability of the 10KV high-voltage connection between the pole column and the voltage sensor. Among them, the shape of the sealing ring is preferably annular. Description of the Drawings

[0019] Figure 1 It is a schematic diagram of a connection structure between a pole column and a voltage sensor according to Embodiment 1 of the present invention;

[0020] Figure 2 is Figure 1 a partial view of A in

[0021] Figure 3Structural schematic diagram of the voltage sensor and the sealing ring according to Embodiment 1 of the present utility model;

[0022] Figure 4 Structural schematic diagram of the voltage sensor according to Embodiment 1 of the present utility model;

[0023] Figure 5 One of the structural schematic diagrams of the sealing ring according to Embodiment 1 of the present utility model;

[0024] Figure 6 Another structural schematic diagram of the sealing ring according to Embodiment 1 of the present utility model;

[0025] In the figure: 1, pole column; 11, cavity; 12, threaded hole; 2, voltage sensor; 21, connecting part; 22, first end; 23, sensor body; 24, second end; 25, wire harness; 3, sealing ring. Specific implementation manners

[0026] To make the technical solution of the present utility model clearer, the following further describes the present utility model in detail with reference to the accompanying drawings and specific embodiments.

[0027] Embodiment 1

[0028] As Figure 1 , this embodiment provides a connection structure between a pole column and a voltage sensor, including: a pole column 1; a cavity 11 and a threaded hole 12 both arranged in the pole column 1, the cavity 11 and the threaded hole 12 being communicated; a voltage sensor 2, one end of the voltage sensor 2 being threadedly connected to the threaded hole 12 so that the voltage sensor 2 is electrically connected to the pole column 1; a sealing ring 3 sleeved outside the other end of the voltage sensor 2, the outer side of the sealing ring 3 being in contact with the inner wall of the cavity 11; wherein, both the voltage sensor 2 and the sealing ring 3 are located in the cavity 11.

[0029] Specifically, the terminal post 1 is used to encapsulate the vacuum interrupter and the conductive connection terminal with solid insulating material to form an independent component, so as to improve the performance and reliability of related electrical equipment. In this application, the terminal post 1 is also used to form a cavity 11 and a threaded hole 12; the cavity 11 is used to accommodate the voltage sensor 2, which is convenient for the voltage sensor 2 to be built into the terminal post 1, so as to effectively protect the voltage sensor 2; the threaded hole 12 is used for threaded connection with one end of the voltage sensor 2, which is convenient for the voltage sensor 2 to be detachably connected in the terminal post 1, so as to facilitate the timely replacement of the voltage sensor 2. Among them, the size of the threaded hole 12 is preferably M5; the sealing ring 3 is used to increase the sealing performance between the voltage sensor 2 and the cavity 11, prevent external water vapor from entering the cavity 11, so as to prevent external water vapor from entering the electrical connection part of the terminal post 1 and the voltage sensor 2, ensure good electrical connection performance between the terminal post 1 and the voltage sensor 2, and further ensure the reliability of the 10KV high-voltage connection between the terminal post 1 and the voltage sensor 2. The sealing ring 3 is also used to prevent the voltage sensor 2 from loosening from the inner wall of the cavity 11, so as to prevent the threaded connection part of the terminal post 1 and the voltage sensor 2 from loosening, ensure good mechanical connection performance between the terminal post 1 and the voltage sensor 2, and further ensure the reliability of the 10KV high-voltage connection between the terminal post 1 and the voltage sensor 2. Among them, the shape of the sealing ring 3 is preferably annular.

[0030] Further, as Figure 3-4 , the voltage sensor 2 includes a connecting part 21, a first end part 22, a sensor body 23 and a second end part 24 connected in sequence. Among them, the connecting part 21 is threadedly connected with the threaded hole 12 so that the connecting part 21 is electrically connected with the terminal post 1. The sealing ring 3 is sleeved outside one end of the sensor body 23 close to the second end part 24. The connecting part 21, the first end part 22, the sensor body 23 and the second end part 24 are all located in the cavity 11. Specifically, the connecting part 21 is used for threaded connection with the threaded hole 12, so that one end of the voltage sensor 2 is threadedly connected with the threaded hole 12; the first end part 22 is used for connecting the connecting part 21 and the sensor body 23; the sensor body 23 is used as the sensing center of the voltage sensor 2, and the sensor body 23 is also electrically connected with the connecting part 21, so that the voltage sensor 2 is electrically connected with the terminal post 1; the second end part 24 is used for connecting with the relevant wire harness 25.

[0031] Further, as Figure 1 and 3-4. The axial length of the cavity 11 is greater than the sum of the axial lengths of the first end portion 22, the sensor body 23, and the second end portion 24. Specifically, the axial length of the cavity 11 is relatively long, and the sum of the axial lengths of the first end portion 22, the sensor body 23, and the second end portion 24 is relatively short, which facilitates the complete placement of the first end portion 22, the sensor body 23, and the second end portion 24 within the cavity 11. This is equivalent to embedding the voltage sensor 2 within the terminal post 1, thereby facilitating the effective protection of the voltage sensor 2.

[0032] Furthermore, as Figure 2 , the diameter of the second end portion 24 is greater than the inner diameter of the sealing ring 3, and the diameter of the second end portion 24 is less than the outer diameter of the sealing ring 3. One end of the second end portion 24 close to the sensor body 23 abuts against the sealing ring 3. Specifically, since the diameter of the second end portion 24 is greater than the inner diameter of the sealing ring 3, it is convenient for the second end portion 24 to have good axial limiting performance on the sealing ring 3, preventing the sealing ring 3 and the voltage sensor 2 from separating from each other and ensuring the good sealing performance and anti-loosening performance of the sealing ring 3. It should be noted that the axial limiting performance specifically includes two aspects. The first aspect is that during installation, first, the sealing ring 3 is sleeved outside the sensor body 23 of the voltage sensor 2, and then by rotating the voltage sensor 2, the connecting portion 21 of the voltage sensor 2 is threadedly connected to the threaded hole 12. At this time, the inner wall of the cavity 11 exerts a force on the outer side of the sealing ring 3, causing the sealing ring 3 to axially move towards the second end portion 24. Since the diameter of the second end portion 24 is greater than the inner diameter of the sealing ring 3, it is convenient for the second end portion 24 to have good axial limiting performance on the sealing ring 3 during installation. The second aspect is that during operation, when the connection structure between the terminal post 1 and the voltage sensor 2 of the present application vibrates, since the diameter of the second end portion 24 is greater than the inner diameter of the sealing ring 3, it is convenient for the second end portion 24 to have good axial limiting performance on the sealing ring 3 during operation; since the diameter of the second end portion 24 is less than the outer diameter of the sealing ring 3, it is convenient for the outer ring of the sealing ring 3 to abut against the inner wall of the cavity 11, ensuring the good sealing performance and anti-loosening performance of the sealing ring 3.

[0033] Furthermore, as Figure 2 , the diameter of the sensor body 23 is greater than the inner diameter of the sealing ring 3. Specifically, the diameter of the sensor body 23 is relatively large, and the inner diameter of the sealing ring 3 is relatively small. When the sealing ring 3 is sleeved outside the sensor body 23, the sealing ring 3 is in a certain state of radial elongation, so that the sealing ring 3 is in close contact with the sensor body 23, thereby preventing the relative axial movement between the sensor body 23 and the sealing ring 3 to a certain extent.

[0034] Furthermore, as Figure 2, the diameter of the second end portion 24 is 52.5 - 53.5 mm. Specifically, the diameter of the second end portion 24 can be 52.5 mm, 53 mm, 53.5 mm, etc., preferably 53 mm. If the diameter of the second end portion 24 is too small, the second end portion 24 cannot axially limit the sealing ring 3. If the diameter of the second end portion 24 is too large, the second end portion 24 cannot be placed in the cavity 11.

[0035] Further, as Figure 5-6 , the material of the sealing ring 3 is rubber. Specifically, the material of the sealing ring 3 can be silicone rubber, fluororubber, etc. Among them, silicone rubber facilitates the sealing ring 3 to have good heat resistance, cold resistance, etc., and fluororubber facilitates the sealing ring 3 to have good high temperature resistance, corrosion resistance, etc.

[0036] This embodiment also provides a circuit breaker, including a connection structure between a pole column and a voltage sensor of this embodiment.

[0037] The above embodiments only represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but should not be construed as limiting the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

1. A connection structure between a pole and a voltage sensor, characterized in that: include: Pole; A cavity and a threaded hole are both provided in the pole, and the cavity and the threaded hole are communicated; A voltage sensor, one end of which is threadedly connected to the threaded hole so that the voltage sensor is electrically connected to the pole; A sealing ring sleeved on the other end of the voltage sensor, wherein the outer side of the sealing ring contacts the inner wall of the cavity; Wherein, the voltage sensor and the sealing ring are both located in the cavity.

2. A connection structure between a pole and a voltage sensor according to claim 1, characterized in that: The voltage sensor includes a connecting portion, a first end, a sensor body and a second end connected in sequence, wherein the connecting portion and the threaded hole are threadedly connected to electrically connect the connecting portion and the pole, the sealing ring is sleeved on the outside of one end of the sensor body close to the second end, and the connecting portion, the first end, the sensor body and the second end are all located in the cavity.

3. The connection structure of a pole and a voltage sensor according to claim 2, characterized in that: The axial length of the cavity is greater than the sum of the axial lengths of the first end, the sensor body and the second end.

4. The connection structure of a pole and a voltage sensor according to claim 2, characterized in that: The diameter of the second end portion is larger than the inner diameter of the sealing ring, the diameter of the second end portion is smaller than the outer diameter of the sealing ring, and one end of the second end portion close to the sensor body contacts the sealing ring.

5. The connection structure of a pole and a voltage sensor according to claim 4, characterized in that: The diameter of the sensor body is greater than the inner ring diameter of the sealing ring.

6. The connection structure of a pole and a voltage sensor according to claim 4, characterized in that: The diameter of the second end portion is 52.5-53.5 mm.

7. A connection structure between a pole and a voltage sensor according to any one of claims 1 to 6, characterized in that: The sealing ring is made of rubber.

8. A circuit breaker, characterized in that: The invention comprises a connection structure between a pole and a voltage sensor as described in any one of claims 1 to 7.

Images