Cover structure with pressure relief function and circuit breaker

Abstract

The utility model discloses a cover structure with a pressure relief function and a circuit breaker, the cover structure with the pressure relief function comprises a cover mounted on a circuit breaker base, the four sides of the cover surface of the cover comprise side edges folded inwards, the side edges are provided with cover plate holes, the inner side of the cross section of a cover plate hole frame is provided with a door stop feature, and the cover plate hole frame is provided with a pressure relief hole. A resettable cover plate which is provided with a rotating shaft at the edge part and rotates outwards is arranged in the cover plate hole, and the cover plate is blocked and limited by the door stop characteristic and is attached to the cover plate hole frame when resetting, so that the problem of unsafety of a circuit breaker cover in high-voltage breaking in the prior art is solved; the beneficial effects that good protection can be achieved during normal use, and pressure relief can be achieved during breaking, so that the pressure of the internal cavity is reduced are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of low-voltage electrical components, and in particular to a cover structure with a pressure relief function of a circuit breaker and a circuit breaker. Background Art

[0002] With the development of the times, the rated working voltage of molded case circuit breakers has been increased from the original 690V to 1140V or even higher, and in some DC conditions it has reached 1500V. The cover is a safety component in the China Compulsory Product Certification of circuit breakers. It plays a very important role in the entire service life of the circuit breaker. During normal use, it can play a protective role to prevent foreign objects from falling into the circuit breaker, and it can also prevent personnel from touching the internal live parts during operation. During the disconnection process, it can also force charged particles, smoke, etc. to be ejected in a predetermined direction without harming the front equipment and operators. However, now that the disconnection voltage is getting higher and higher, the capacity generated during disconnection is getting larger and larger, and the pressure generated in the internal cavity of the switch is also correspondingly increased, resulting in the cover sometimes being unable to withstand the internal gas pressure, cracking, or even bursting.

[0003] In order to solve the problem of gas cracking and breaking the cover when high voltage is disconnected, the cover of the molded case circuit breaker on the market is made thicker or the nylon material is changed to DMC type unsaturated polyester glass fiber reinforced molding material, so that the cover itself can withstand greater pressure, but this forces other parts that need to withstand the same pressure to increase their strength; or corresponding exhaust holes are opened on the cover, but this solution will lead to a decrease in the protection level. Summary of the invention

[0004] In view of the deficiencies of the prior art, the present application provides a cover structure and a circuit breaker with a pressure relief function to solve the problem that the circuit breaker cover of the prior art is unsafe when disconnecting at high voltage.

[0005] To achieve the above objectives, this application is implemented through the following technical solutions:

[0006] A cover with a pressure relief function comprises a cover installed on a circuit breaker base, wherein the four sides of the cover surface comprise side edges folded inwardly, a cover plate hole is opened on the side edges, a door stop feature is arranged on the inner side of the cross section of the cover plate hole frame, a resettable cover plate with a rotating shaft at the edge and rotating outwardly is installed in the cover plate hole, and when the cover plate is reset, it is blocked by the door stop feature and fits with the cover plate hole frame.

[0007] Preferably, a door stop notch is provided on the inner side of the cover plate at a position corresponding to the door stop feature.

[0008] Preferably, the rotation axis is parallel to the cover surface of the cover.

[0009] Preferably, the cover plate hole is open on a side far from the cover surface.

[0010] Preferably, the rotation axis of the cover plate is arranged on a side close to the cover surface.

[0011] Preferably, it also includes an axis and a reset device, the cover plate is perpendicular to the cover surface and has a second axis hole in the form of a blind hole parallel to the cover surface at the position close to the cover surface on both sides, the cover plate hole frame of the cover is provided with a first axis hole in the form of a blind hole parallel to the cover surface at the position corresponding to the second axis hole, one end of the axis is installed in the first axis hole, and the other end is installed in the second axis hole, the reset device is connected to the cover and the cover plate at the same time and pulls the cover plate back to be flush with the side of the cover after the cover plate is rotated.

[0012] Preferably, the reset device uses a torsion spring, which is a single-arm bent torsion spring, with a spring coil mounted on a shaft, and a second torsion spring fixing hole in the form of a blind hole parallel to the cover surface is opened at the position of the two side surfaces of the cover plate perpendicular to the cover surface and far from the cover surface, and a first torsion spring fixing hole in the form of a blind hole parallel to the cover surface is opened at the position of the cover plate hole frame of the cover corresponding to the second torsion spring fixing hole, a bent end of one torsion arm of the torsion spring is inserted into the first torsion spring fixing hole for fixation, and a bent end of the other torsion arm is inserted into the second torsion spring fixing hole for fixation, and a torsion spring accommodating space is reserved between the contact surface of the cover plate and the cover plate hole frame perpendicular to the cover surface.

[0013] Preferably, the torsion spring accommodating space is configured as a concave feature of the cover plate.

[0014] Preferably, it also includes a compression spring, the length of the shaft is shorter than the distance between the bottom surface of the first shaft hole and the second shaft hole, and one end of the compression spring is installed in the first shaft hole or the second shaft hole close to the end surface of the shaft so that the compression spring can be installed into the second shaft hole or the first shaft hole on the opposite side after compression.

[0015] Based on the same inventive concept, the present application also discloses a circuit breaker, comprising the aforementioned cover structure with pressure relief function, wherein the cover of the cover structure is installed on the base of the circuit breaker.

[0016] Compared with the prior art, the present solution has the following beneficial effects: the cover structure with pressure relief function of the present application is used for high-performance molded case circuit breakers, and corresponding exhaust windows, i.e., cover plate holes, are opened on both sides of the cover, and a cover plate that can be rotated outward and reset is placed on the cover, so that good protection can be achieved during normal use, and pressure relief can be opened during disconnection to reduce the pressure of the internal cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the three-dimensional structure of an embodiment of a cover with a pressure relief function of the present application from an outside perspective;

[0018] Figure 2 This is a schematic diagram of the three-dimensional structure of an embodiment of a cover with a pressure relief function of the present application, showing a hidden inner side view of one side of the cover plate;

[0019] Figure 3 This is a schematic diagram of a three-dimensional structure of an embodiment of a cover with a pressure relief function of the present application, showing another inner side perspective of hiding one side of the cover plate;

[0020] Figure 4 This is a schematic diagram of a three-dimensional structure of one side of a cover plate of an embodiment of the present application being installed with a torsion spring and a shaft;

[0021] Among them, 1-cover, 11-door stop feature, 12-first shaft hole, 13-first torsion spring fixing hole, 2-cover plate, 21-door stop notch, 22-concave feature, 23-second shaft hole, 24-second torsion spring fixing hole, 3-torsion spring, 4-shaft, 5-compression spring. DETAILED DESCRIPTION

[0022] 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 the embodiments.

[0023] This embodiment provides a technical solution: a cover structure with a pressure relief function disclosed in this solution includes a cover 1, two cover plates 2, two torsion springs 3, two shafts 4 and two compression springs 5. The cover 1 is a cover 1 of a molded case circuit breaker with exhaust ports, i.e., cover plate holes, arranged on both sides. As one of the external components of the molded case circuit breaker, the cover plate 2 cooperates with the cover 1 to form a complete assembly, i.e., a cover structure, when the circuit breaker is disconnected, a large pressure is generated inside, and the pressure drives the cover plate 2 to rotate, and the exhaust port is opened by rotating to release the internal pressure. The exhaust port is closed under the action of the torsion spring 3, and the torsion spring 3 provides power for closing the cover plate 2. One side foot is installed in the first torsion spring fixing hole 13 of the cover plate 1, and the other side foot is installed in the second torsion spring fixing hole 13 of the cover plate 2. The shaft 4 is the installation and fixing shaft of the cover plate 2, and also serves as the rotation axis of the cover plate 2 and the installation axis of the torsion spring 3. When installing the cover plate 2, the compression spring 5 can compress the distance between the shafts 4 on both sides and can be installed in the cover 1. After being installed in place, it can provide pressure for the shaft 4, so that the cover plate 2 and the cover 1 are more stably connected together.

[0024] One side of the cover plate 2 is fixed on the cover 1 under the connection of the shaft 4, and the cover plate 2 can only rotate. When working normally, that is, when in normal use, the cover plate 2 is tightly attached to the side of the cover 1 under the action of the torsion of the torsion spring 3, that is, the torsion spring 3 presses the two cover plates 2 tightly on the cover 1 to form a whole without obvious gaps, which can meet the corresponding protection level requirements; but when the circuit breaker is disconnected, when a large pressure is generated inside the circuit breaker, under the action of the huge internal pressure, the cover plate 2 is forced and pushed to rotate around the rotation fixing axis of the cover plate 2, that is, the shaft 4, and the exhaust port on the cover 1 is rotated to open. After the cover plate 2 is rotated open, the pressure inside the circuit breaker is quickly reduced and released. After the internal pressure is released and the pressure is balanced with the outside, the cover plate 2 is restored to a closed state under the action of the torsion spring 3, thereby restoring the original state. The present application can set more cover plate holes or cover plate holes of other shapes according to actual conditions, and can also adjust the size and number of the exhaust window, that is, the cover plate hole.

[0025] For the rotation and reset structure of the cover plate 2, different structures that can achieve the purpose can be used, such as a self-reset hinge, one page of the hinge is installed on the inner side of the cover plate 2, and the other page is installed on the inner side of the cover plate hole of the cover 1 parallel to the cover surface. This solution does not require the use of an axis hole. Alternatively, a door closer structure can be used, and the cover 1 and the cover plate 2 are fixed by a door closer structure extending into the cover, and the door closer structure acts as a reset device.

[0026] In this embodiment, the door stop notch 21 provided on the inner side of the cover plate 2 corresponding to the door stop feature 11 can make the outer surface of the cover plate 2 flush with the outer surface of the side of the cover 1. When the cover plate 2 is thin, the notch may not be provided.

[0027] The cover plate hole in the present application is set according to the shape of the cover plate 2, and can also be a fully enclosed structure. When the far cover surface is closed, a door stop feature 11 can also be set on one side of the far cover surface.

[0028] Regarding the setting of the torsion spring accommodating space, it is not limited to setting the concave feature 22 on the side of the cover plate 2, and it can also be set on the side of the cover 1.

[0029] The installation method of the shaft 4 in the present application is not limited to the use of a compression spring 5 at the end. For example, the plain edges of the first shaft hole 12 and the second shaft hole 23 can be opened a small section, such as 90°, to form a semi-open hole groove with a bayonet, and then the shaft 4 can be snapped in.

[0030] Based on the same inventive concept, the present application also discloses a circuit breaker embodiment, including the aforementioned cover structure with pressure relief function, wherein a cover 1 of the cover structure is installed on a base of the circuit breaker.

[0031] In the description of the present application, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, if the terms "first", "second", etc. appear, they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0032] The above is only a preferred specific implementation method of the present scheme, but the protection scope required by the present scheme is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes according to the technical scheme and inventive concept of the present application within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present application.

Claims

1. A cover structure with a pressure relief function, comprising a cover (1) mounted on a circuit breaker base, wherein four sides of the cover surface of the cover (1) include side edges folded inward, wherein: A cover plate hole is provided on the side edge, a door stop feature (11) is provided on the inner side of the cross section of the cover plate hole frame, a repositionable cover plate (2) with a rotation axis at the edge and rotatable outwards is installed in the cover plate hole, and when the cover plate (2) is reset, it is stopped by the door stop feature (11) and fits with the cover plate hole frame.

2. The cover structure with pressure relief function according to claim 1, characterized in that: A door stop notch (21) is provided on the inner side of the side edge of the cover plate (2) at a position corresponding to the door stop feature (11).

3. The cover structure with pressure relief function according to claim 1, characterized in that: The rotation axis is parallel to the cover surface of the cover (1).

4. The cover structure with pressure relief function according to claim 3, characterized in that: The cover plate hole is open on one side of the far cover surface.

5. The cover structure with pressure relief function according to claim 4, characterized in that: The rotation axis of the cover plate (2) is arranged on a side close to the cover surface.

6. The cover structure with pressure relief function according to claim 1, characterized in that: It also comprises a shaft (4) and a reset device; the cover plate (2) is provided with a second shaft hole (23) in the form of a blind hole parallel to the cover surface at positions close to the cover surface on both sides perpendicular to the cover surface; the cover plate hole frame of the cover (1) is provided with a first shaft hole (12) in the form of a blind hole parallel to the cover surface at a position corresponding to the second shaft hole (23); one end of the shaft (4) is mounted in the first shaft hole (12) and the other end is mounted in the second shaft hole (23); the reset device is connected to the cover (1) and the cover plate (2) at the same time and pulls the cover plate (2) back to be flush with the side edge of the cover (1) after the cover plate (2) rotates.

7. The cover structure with pressure relief function according to claim 6, characterized in that: The reset device uses a torsion spring (3), which is a single-arm bent torsion spring, the spring coil being sleeved on a shaft (4); the cover plate (2) is provided with a second torsion spring fixing hole (24) in the form of a blind hole parallel to the cover surface at a position far from the cover surface on two side surfaces perpendicular to the cover surface; the cover plate hole frame of the cover (1) is provided with a first torsion spring fixing hole (13) in the form of a blind hole parallel to the cover surface at a position corresponding to the second torsion spring fixing hole (24); the bent end of one torsion arm of the torsion spring (3) is inserted into the first torsion spring fixing hole (13) for fixing, and the bent end of the other torsion arm is inserted into the second torsion spring fixing hole (24) for fixing; and a torsion spring accommodating space is reserved between the contact surface of the cover plate (2) and the cover plate hole frame perpendicular to the cover surface.

8. The cover structure with pressure relief function according to claim 7, characterized in that: The torsion spring accommodating space is configured as a concave feature (22) of the cover plate (2).

9. The cover structure with pressure relief function according to claim 6, characterized in that: It also includes a compression spring (5), the length of the shaft (4) is shorter than the distance between the bottom surface of the first shaft hole (12) and the second shaft hole (23), and one end of the compression spring (5) is installed in the first shaft hole (12) or the second shaft hole (23) in close contact with the end surface of the shaft (4) so ​​that the compression spring (5) can be installed in the second shaft hole (23) or the first shaft hole (12) on the opposite side after being compressed.

10. A circuit breaker, characterized in that: It comprises a cover structure with a pressure relief function as claimed in any one of claims 1 to 9, wherein a cover (1) of the cover structure is mounted on a base of a circuit breaker.

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