A cutting device

Abstract

The present application relates to the technical field of circuit breaker, in particular to a kind of cut-off device, the cut-off device provided by the present application includes: shell, movable contact and at least one limiting piece. Wherein, shell is opened with let hole;Movable contact is rotatably arranged in shell;Limiting piece is fixedly arranged on movable contact, limiting piece is slidingly connected in let hole, and limiting piece protrudes from let hole setting. The cut-off device of this structure, movable contact will rotate under the action of electric repulsion, to disconnect the circuit;Movable contact will drive limiting piece to rotate during rotation, limiting piece protrudes from let hole setting during rotation, which can reduce the occurrence of limiting piece falling off from let hole, thereby reducing the occurrence of movable contact falling off from shell, improve the safety of cut-off device.

Description

Technical Field

[0001] This invention relates to the field of circuit breaker technology, and more specifically to a cutting-off device. Background Technology

[0002] A circuit breaker is a switching device capable of closing, carrying, and interrupting current under normal circuit conditions, and capable of closing, carrying, and interrupting current under abnormal circuit conditions within a specified time. A circuit breaker consists of a contact system, an arc-extinguishing system, an operating mechanism, a trip unit, and a housing.

[0003] The contact system includes a moving contact and a stationary contact. The moving contact is installed in a rotating housing, and the stationary contact is installed in the housing. During normal operation of the circuit, the moving and stationary contacts are in contact. When a short circuit occurs in the circuit, the electrodynamic repulsion generated by the moving and stationary contacts when the short-circuit current passes through them causes the moving contact to be repelled and disconnected from the stationary contact before the operating mechanism actuates; thus achieving the function of interrupting the fault current.

[0004] Traditional rotating housings have a linkage shaft, and the moving contact has a matching groove. The moving contact is connected to one end of a spring, and the rotating housing is connected to the other end of the spring. Under the action of electric repulsion, the boss on the moving contact will push open the linkage shaft, and the groove will be embedded in the coupling. During this process, the spring is in a stretched state. Moreover, the force required by the spring when the boss pushes open the linkage shaft is relatively large, which leads to insufficient reliability of the spring. This results in insufficient safety of the contact system. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect of insufficient safety of the contact system in the prior art under the action of electric repulsion, thereby providing a cutting device.

[0006] To address the above problems, the present invention provides a cutting device, comprising:

[0007] A housing, wherein a clearance hole is provided on the housing;

[0008] The moving contact is rotatably disposed within the housing;

[0009] At least one limiting member is fixedly disposed on the moving contact, the limiting member is slidably connected in the clearance hole, and the limiting member protrudes from the clearance hole.

[0010] Optional, also includes:

[0011] The housing has a first limiting part and a second limiting part;

[0012] The first limiting part is formed inside the housing;

[0013] The second limiting part is formed inside the housing, and the first limiting part and the second limiting part are disposed opposite to each other;

[0014] The moving contact has a repulsion-locked state in which it rotates along the side away from the stationary contact and abuts against the first limiting part under the action of electric repulsion force, and in the repulsion-locked state, the moving contact and the second limiting part are spaced apart; a free state in which the moving contact rotates along the side away from the first limiting part and abuts against the second limiting part under the drive of a first external force; and a closed state in which the moving contact abuts against the stationary contact under the drive of a second external force, and in the closed state, the moving contact does not contact the first limiting part and the second limiting part; the moving contact is switched between the repulsion-locked state, the free state and the closed state.

[0015] Optionally, the clearance hole is provided to extend inward along the surface of the housing.

[0016] Optional, also includes:

[0017] A torsion spring, adapted to limit the movement of the limiting member; the torsion spring includes:

[0018] The device comprises a first connecting part, a second connecting part, and a sleeve part. The first connecting part is connected to the limiting member, the second connecting part is connected to and disposed on the housing, and the sleeve part is sleeved on the mounting part of the housing.

[0019] When the moving contact is in the repulsive locked state, the first connecting portion applies a first elastic force to the limiting member, moving towards the side closer to the second limiting portion; when the moving contact is in the free state, the first connecting portion applies a second elastic force to the limiting member, moving towards the side closer to the first limiting portion; when the moving contact is in the closed state, the first connecting portion applies a third elastic force to the limiting member, moving towards the side closer to the first limiting portion.

[0020] Optionally, the first connecting portion has a first bearing surface and a second bearing surface, and the first bearing surface and the second bearing surface are connected;

[0021] In the repulsion-locked state, the limiting member abuts against the first bearing surface; in the free state, the limiting member abuts against the second bearing surface; in the closed state, the limiting member abuts against the second bearing surface.

[0022] Optionally, the angle between the first bearing surface and the second bearing surface is greater than 90 degrees and less than 180 degrees.

[0023] Optional, also includes:

[0024] A placement cavity is formed on the housing, and the second connecting part is connected to the placement cavity;

[0025] A support member is formed on the placement cavity and protrudes outward along the surface of the placement cavity;

[0026] The support member is adapted to be fitted onto the sleeve portion.

[0027] Optional, also includes:

[0028] A displacement compensation component is disposed between the housing and the moving contact, and the displacement compensation component is adapted to compensate for the deflection direction of the silver dot portion on the moving contact.

[0029] Optionally, the displacement compensation component includes:

[0030] A connecting rod, which is fixedly connected to the housing;

[0031] A sliding hole is formed on the moving contact, and the sliding hole extends inward along the surface of the moving contact; and the arrangement direction of the sliding hole is parallel to the height direction of the silver dot portion.

[0032] The connecting rod is slidably connected to the sliding hole;

[0033] In the closed state, the connecting rod is adapted to move along the opening direction of the sliding hole under the drive of the third elastic force.

[0034] Optionally, the housing includes: a first housing and a second housing, the first housing and the second housing fitting together to form a mounting cavity suitable for placing the moving contact;

[0035] The first limiting part is formed on one side inner wall of the mounting cavity;

[0036] The second limiting part is formed on the inner wall of the other side of the mounting cavity; the first limiting part and the second limiting part are disposed opposite to each other.

[0037] The present invention has the following advantages:

[0038] 1. The present invention provides a cutting device, comprising: a housing, a movable contact, and at least one limiting member. The housing has a clearance hole; the movable contact is rotatably disposed within the housing; the limiting member is fixedly disposed on the movable contact, slidably connected in the clearance hole, and protruding from the clearance hole.

[0039] In this cutting device, the moving contact rotates along the side away from the stationary contact under the action of electric repulsion to disconnect the circuit. During the rotation of the moving contact, the limiting member will rotate. The limiting member has a protruding relief hole during the rotation, which reduces the occurrence of the limiting member falling out of the relief hole, thereby reducing the occurrence of the moving contact falling out of the housing and improving the safety of the cutting device.

[0040] 2. The present invention provides a cutting device, further comprising: a torsion spring, the torsion spring being adapted to limit the movement of a limiting member, the torsion spring comprising: a first limiting part, a second limiting part, and a sleeve part, the first connecting part being connected to the limiting member, the second connecting part being connected to and disposed on the housing, and the sleeve part being sleeved on the mounting part of the housing; when the moving contact is in a repelled locked state, the first connecting part applies a first elastic force to the limiting member toward the side closer to the second limiting part; when the moving contact is in a free state, the first connecting part applies a second elastic force to the limiting member toward the side closer to the first limiting part; when the moving contact is in a closed state, the first connecting part applies a third elastic force to the limiting member toward the side closer to the first limiting part.

[0041] This cutting device uses a first elastic force to limit the movement of the limiting member, keeping the moving contact in a repellent-locked state. This prevents the moving contact from engaging with the stationary contact due to its own weight, ensuring circuit disconnection and providing safety protection. A second elastic force limits the movement of the limiting member and is transmitted to the moving contact after passing through the limiting member. This provides the initial pressure when the moving contact switches from a free state to a repellent-locked state or a closed state, ensuring normal operation of the moving contact. A third elastic force limits the movement of the limiting member, allowing the moving contact and stationary contact to connect.

[0042] 3. The present invention provides a cutting device, which further includes: a displacement compensation component, which is disposed between the housing and the moving contact, and is adapted to compensate for the deflection direction of the silver dot portion on the moving contact.

[0043] When the circuit is cut off by the cutting device of this structure, the large current in the circuit will heat up and melt the silver point. Since the melting of the silver point at both ends of the moving contact is different, in order to ensure the connection between the moving contact and the stationary contact in the closed state, a displacement compensation component is set to compensate for the deflection direction of the silver point. Attached Figure Description

[0044] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0045] Figure 1 A schematic diagram of the main structure of the cutting device provided in an embodiment of the present invention;

[0046] Figure 2 An exploded view of the main structure of the cutting device provided in an embodiment of the present invention;

[0047] Figure 3 Side view of the main structure of the cutting device provided in an embodiment of the present invention;

[0048] Figure 4 For the present invention Figure 3 A cross-sectional view of section AA in the image;

[0049] Explanation of reference numerals in the attached figures:

[0050] 1-Housing shell; 11-Lean-out hole;

[0051] 2-Moving contact;

[0052] 3-Limiting components;

[0053] 4- Torsion spring;

[0054] 5-Placement cavity; 41-First connecting part; 42-Second connecting part;

[0055] 6-Supporting components;

[0056] 7-Displacement compensation component; 71-Connecting rod; 72-Sliding hole. Detailed Implementation

[0057] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0058] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0059] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0060] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0061] Example

[0062] This embodiment provides a cutting device, such as Figures 1 to 4 As shown, it includes: a housing 1, a moving contact 2, and at least one limiting member 3. The housing 1 has a clearance hole 11; the moving contact 2 is rotatably disposed inside the housing 1; the limiting member 3 is fixedly disposed on the moving contact 2, and the limiting member 3 is slidably connected in the clearance hole 11, and the limiting member 3 protrudes from the clearance hole 11.

[0063] In this cutting device, the moving contact 2 rotates along the side away from the stationary contact under the action of electric repulsion to disconnect the circuit. During the rotation of the moving contact 2, the limiting member 3 will rotate. The limiting member 3 protrudes from the relief hole 11 during the rotation, which reduces the occurrence of the limiting member 3 falling out of the relief hole 11, thereby reducing the occurrence of the moving contact 2 falling out of the housing 1, and thus improving the safety of the cutting device.

[0064] like Figure 1 , Figure 2 and Figure 4As shown, in this embodiment, four clearance holes 11 are provided. Two clearance holes 11 are arranged in a group, with one group being opened on one side of the housing 1; the other group of clearance holes 11 are symmetrically opened on the other side of the housing 1; the two clearance holes 11 in the same group are arranged centrally symmetrically; two sets of limiting members 3 are provided, and the two sets of limiting members 3 are respectively fixedly installed on the moving contact 2, and the limiting members 3 are conformally fitted to the clearance holes 11; in other embodiments, two groups of clearance holes 11 can be provided, with the two clearance holes 11 respectively opened on the two sides of the housing 1, and the two clearance holes 11 are symmetrical. The configuration includes: a set of limiting members 3, which are fixedly installed on the moving contact 2 and slidably disposed in the relief hole 11; in another embodiment, a relief hole 11 is provided on the side wall of the housing 1, and a limiting member 3 is provided, which is fixedly disposed on the moving contact 2 and slidably disposed in the relief hole 11. Specifically, the number of limiting members 3 and relief holes 11 is not limited, as long as the limiting member 3 is slidably connected in the relief hole 11 and protrudes from the relief hole 11.

[0065] like Figures 1 to 4 As shown, in this embodiment, the housing 1 has a first limiting part and a second limiting part; the first limiting part is formed inside the housing 1; the second limiting part is formed inside the housing 1, and the first limiting part and the second limiting part are arranged opposite to each other; the moving contact 2 has a repulsion-locked state in which it rotates along the side away from the stationary contact and abuts against the first limiting part under the action of electric repulsion force, and in the repulsion-locked state, the moving contact 2 is spaced apart from the second limiting part; a free state in which the moving contact 2 is driven by a first external force to rotate along the side away from the first limiting part and abut against the second limiting part; and a closed state in which the moving contact 2 abuts against the stationary contact under the drive of a second external force, and in the closed state, the moving contact 2 does not contact the first limiting part and the second limiting part; the moving contact 2 is switched between the repulsion-locked state, the free state and the closed state.

[0066] like Figure 1 , Figure 2 and Figure 4 As shown, in this embodiment, the clearance hole 11 is an arc-shaped hole, which is provided through the surface of the housing 1. When the limiting member 3 rotates with the moving contact 2, the limiting member 3 is in a circumferential motion state, and the arc-shaped hole is suitable for accommodating the limiting member 3. In other embodiments, the clearance hole 11 can be a square hole, which is provided through the surface of the housing 1. When the limiting member 3 rotates with the moving contact 2, the limiting member 3 is in a circumferential motion state, and the square hole is suitable for accommodating the limiting member 3. Specifically, the shape of the clearance hole 11 is not limited, as long as it is provided through the surface of the housing 1.

[0067] like Figure 1 , Figure 2 and Figure 4 As shown, in this embodiment, it further includes a torsion spring 4, which is adapted to limit the movement of the limiting member 3. The torsion spring 4 includes a first limiting part, a second limiting part, and a sleeve part. The first connecting part 41 is connected to the limiting member 3, the second connecting part 42 is connected to the housing 1, and the sleeve part is sleeved on the mounting part of the housing 1. When the moving contact 2 is in the open and locked state, the first connecting part 41 applies a first elastic force to the limiting member 3, which moves toward the side closer to the second limiting part. When the moving contact 2 is in the free state, the first connecting part 41 applies a second elastic force to the limiting member 3, which moves toward the side closer to the first limiting part. When the moving contact 2 is in the closed state, the first connecting part 41 applies a third elastic force to the limiting member 3, which moves toward the side closer to the first limiting part. The first elastic force is suitable for limiting the movement of the limiting member 3, so that the moving contact 2 is kept in the repulsive locked state, thereby preventing the moving contact 2 from engaging with the stationary contact due to its own weight, thus ensuring the circuit is disconnected and playing a safety protection role; the second elastic force is suitable for limiting the movement of the limiting member 3, and the second elastic force is transmitted to the moving contact 2 after passing through the limiting member 3, thereby providing the initial pressure when the moving contact 2 switches from the free state to the repulsive locked state or the closed state, thus meeting the normal use of the moving contact 2; the third elastic force is suitable for limiting the movement of the limiting member 3, so that the moving contact 2 and the stationary contact are connected; wherein, the torsion spring member 4 is provided with four In one embodiment, two sets of torsion springs 4 are arranged as one group, with one set of torsion springs 4 symmetrically arranged on one side of the housing 1 and the other set of torsion springs 4 symmetrically arranged on the other side of the housing 1. In another embodiment, two sets of torsion springs 4 are provided, with the two sets of torsion springs 4 respectively arranged on the two sides of the housing 1 and symmetrically arranged. In addition, in another embodiment, one set of torsion springs 4 is provided, with one set of torsion springs 4 provided on the side wall of the housing 1. Specifically, the number of torsion springs 4 is not limited, as long as the first connecting part 41 is connected to the limiting part 3, the second connecting part 42 is connected to the housing 1, and the sleeve part is sleeved on the mounting part of the housing 1.

[0068] like Figure 1 , Figure 2 and Figure 4 As shown, in this embodiment, the first connecting part 41 has a first bearing surface and a second bearing surface, and the first bearing surface and the second bearing surface are connected; in the repulsion locking state, the limiting member 3 abuts against the first bearing surface; in the free state, the limiting member 3 abuts against the second bearing surface; in the closed state, the limiting member 3 abuts against the second bearing surface.

[0069] like Figure 1 , Figure 2 and Figure 4 As shown, in this embodiment, the included angle between the first bearing surface and the second bearing surface is greater than 90 degrees and less than 180 degrees.

[0070] like Figure 1 , Figure 2 and Figure 4 As shown, in this embodiment, it further includes: a placement cavity 5 and a support member 6. The placement cavity 5 is formed on the housing 1, and the second connecting part 42 is fixedly connected to the placement cavity 5. The support member 6 is formed on the placement cavity 5 and protrudes outward along the surface of the placement cavity 5. The support member 6 is adapted to fit onto the sleeve part. By providing the placement cavity 5, the cutting device can be divided into different cavities, thereby avoiding the adhesion of particles from the burnt moving contact 2 to the torsion spring 4 when the moving contact 2 and the stationary contact are separated, which would affect the working performance of the torsion spring 4. The placement cavity 5 is suitable for accommodating the torsion spring 4. There are four placement cavities 5, which are arranged in pairs. One set of placement cavities 5 is located on one side wall of the housing 1, and the other set of placement cavities 5 is located on the other side wall of the housing 1. The placement cavities 5 in the same group are arranged centrally symmetrically. In other embodiments, there are two placement cavities 5, which are symmetrically arranged on the two side walls of the housing 1. In addition, in another embodiment, there is one placement cavity 5, which is located on the housing 1. Specifically, the number of placement cavities 5 is not limited, as long as it matches the number of torsion spring 4. The number of support members 6 matches the number of placement cavities 5.

[0071] like Figures 1 to 4 As shown, in this embodiment, a displacement compensation component 7 is also included. The displacement compensation component 7 is disposed between the housing 1 and the moving contact 2. The displacement compensation component 7 is adapted to compensate for the deflection direction of the silver dot portion on the moving contact 2. When the cutting device cuts off the circuit, the large current in the circuit generates heat during the circuit break, which melts the silver dot portion. Since the melting conditions of the silver dot portions at both ends of the moving contact 2 are different, in order to ensure the connection between the moving contact 2 and the stationary contact in the closed state, the displacement compensation component 7 is provided to compensate for the deflection direction of the silver dot portion.

[0072] like Figures 1 to 4 As shown, in this embodiment, the displacement compensation component 7 includes: a connecting rod 71 and a sliding hole 72; the connecting rod 71 is fixedly connected to the housing 1; the sliding hole 72 is formed on the moving contact 2, and the sliding hole 72 extends inward along the surface of the moving contact 2; the arrangement direction of the sliding hole 72 is parallel to the height direction of the silver point; the connecting rod 71 is slidably connected to the sliding hole 72; in the closed state, the connecting rod 71 is adapted to move along the opening direction of the sliding hole 72 under the drive of a third elastic force. The sliding hole 72 is an oblong hole, and the length direction of the oblong hole is parallel to the height direction of the silver point; the connecting rod 71 is slidably disposed in the oblong hole.

[0073] like Figures 1 to 4As shown, in this embodiment, the housing 1 includes a first housing 1 and a second housing 1, which fit together to form a mounting cavity suitable for placing the moving contact 2. A first limiting part is formed on one inner wall of the mounting cavity; a second limiting part is formed on the other inner wall of the mounting cavity; the first limiting part and the second limiting part are disposed opposite to each other. By providing the first housing 1 and the second housing 1, the installation of the moving contact 2 can be facilitated, and in subsequent maintenance and replacement processes, the first housing 1 and the second housing 1 can be disassembled to replace damaged parts, thereby reducing maintenance costs.

[0074] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A cutting device, characterized in that, include: The housing (1) has a clearance hole (11) on it. The moving contact (2) is rotatably disposed within the housing (1); At least one limiting member (3) is fixedly disposed on the moving contact (2), the limiting member (3) is slidably connected in the relief hole (11), and the limiting member (3) protrudes from the relief hole (11); The housing (1) has a first limiting part and a second limiting part; The first limiting part is formed inside the housing (1); The second limiting part is formed inside the housing (1), and the first limiting part and the second limiting part are disposed opposite to each other; The moving contact (2) has a repulsion-locked state in which it rotates along the side away from the stationary contact and abuts against the first limiting part under the action of electric repulsion force, and in the repulsion-locked state, the moving contact (2) is spaced apart from the second limiting part; a free state in which the moving contact (2) rotates along the side away from the first limiting part and abuts against the second limiting part under the drive of a first external force; and a closed state in which the moving contact (2) abuts against the stationary contact under the drive of a second external force, and in the closed state, the moving contact (2) does not contact the first limiting part and the second limiting part; the moving contact (2) is switched between the repulsion-locked state, the free state and the closed state.

2. The cutting device according to claim 1, characterized in that, The clearance hole (11) is provided to extend inward along the surface of the housing (1).

3. The cutting device according to claim 1, characterized in that, Also includes: Torsion spring (4), said torsion spring (4) is adapted to limit the movement of said limiting member (3); The torsion spring (4) includes: The device comprises a first connecting part (41), a second connecting part (42), and a sleeve part. The first connecting part (41) is connected to the limiting member (3), the second connecting part (42) is connected to the housing (1), and the sleeve part is sleeved on the mounting part of the housing (1). When the moving contact (2) is in the repulsion locked state, the first connecting part (41) applies a first elastic force to the limiting member (3) to move toward the side closer to the second limiting part; when the moving contact (2) is in the free state, the first connecting part (41) applies a second elastic force to the limiting member (3) to move toward the side closer to the first limiting part; when the moving contact (2) is in the closed state, the first connecting part (41) applies a third elastic force to the limiting member (3) to move toward the side closer to the first limiting part.

4. The cutting device according to claim 3, characterized in that, The first connecting part (41) has a first bearing surface and a second bearing surface, and the first bearing surface and the second bearing surface are connected; In the repulsion-locked state, the limiting member (3) abuts against the first bearing surface; in the free state, the limiting member (3) abuts against the second bearing surface; in the closed state, the limiting member (3) abuts against the second bearing surface.

5. The cutting device according to claim 4, characterized in that, The angle between the first bearing surface and the second bearing surface is greater than 90 degrees and less than 180 degrees.

6. The cutting device according to claim 4, characterized in that, Also includes: Placement cavity (5), the placement cavity (5) is opened on the housing (1), and the second connecting part (42) is connected to the placement cavity (5); Support member (6), the support member (6) is formed on the placement cavity (5), and the support member (6) is provided to protrude outward along the surface of the placement cavity (5); The support member (6) is adapted to be sleeved on the sleeve portion.

7. The cutting device according to claim 3, characterized in that, Also includes: Displacement compensation component (7) is disposed between the housing (1) and the moving contact (2), and the displacement compensation component (7) is adapted to compensate for the deflection direction of the silver dot portion on the moving contact (2).

8. The cutting device according to claim 7, characterized in that, The displacement compensation component (7) includes: A connecting rod (71) is fixedly connected to the housing (1); A sliding hole (72) is formed on the moving contact (2), and the sliding hole (72) extends inward along the surface of the moving contact (2); and the arrangement direction of the sliding hole (72) is parallel to the height direction of the silver dot portion; The connecting rod (71) is slidably connected to the sliding hole (72); In the closed state, the connecting rod (71) is adapted to move along the opening direction of the sliding hole (72) under the drive of the third elastic force.

9. The cutting device according to claim 1, characterized in that, The housing (1) includes: a first housing (1) and a second housing (1), the first housing (1) and the second housing (1) fitting together, the first housing (1) and the second housing (1) forming a mounting cavity suitable for placing the moving contact (2); The first limiting part is formed on one side inner wall of the mounting cavity; The second limiting part is formed on the inner wall of the other side of the mounting cavity; the first limiting part and the second limiting part are disposed opposite to each other.

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