A moving contact mechanism and circuit breaker

Abstract

A moving contact mechanism and circuit breaker are disclosed, comprising: a contact support having a first surface and a second surface; the first surface having a first mounting surface; a positioning shaft being provided on the first mounting surface; and a mating wall being provided on one side of the first mounting surface, the mating wall having a positioning groove; a moving contact having a circular hole adapted to the positioning shaft, being mounted on the first mounting surface, and the moving contact extending towards the stationary contact to form a positioning block, the positioning block being adapted to the positioning groove; a torsion spring sleeved on the positioning shaft, one end of which overlaps with the contact support, and the other end of which overlaps with the moving contact; a latch rotatably disposed on the second surface of the contact support; and a jump catch rotatably disposed on the second surface of the contact support and overlapping with the latch. This application utilizes the engagement of the positioning block of the moving contact with the positioning groove of the contact support to limit the swing of the moving contact on the contact support, ensuring that the position of the moving contact in contact with the stationary contact remains consistent each time.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical technology, specifically to a moving contact mechanism and a circuit breaker. 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 generally consists of a contact system, an arc-extinguishing system, an operating mechanism, a trip unit, and a housing. The contact system is used to connect or disconnect the circuit under the action of the operating mechanism. The trip unit is used to drive the operating mechanism to separate the moving and stationary contacts and disconnect the circuit when an overload or short circuit occurs, thus providing protection.

[0003] The contact system includes a moving contact mechanism and a stationary contact. The moving contact mechanism typically mounts the moving contact on a contact support, which drives the moving contact's movement. The moving contact usually has a hole, and a corresponding positioning shaft is installed on the contact support. Positioning is achieved through the engagement of the hole and the positioning shaft. Furthermore, a torsion spring is used to fix them in place. However, in practice, because the diameter of the moving contact's hole is larger than the diameter of the positioning shaft, a certain swing gap exists between the moving contact and the contact support. Although the torsion spring fixes their positions, during opening and closing operations, this swing gap means that the point of contact between the moving contact and the stationary contact is not fixed each time they close. This contact point misalignment poses the following risks:

[0004] This can lead to increased local wear of the contacts, shortening their lifespan; in severe cases, it may cause deformation of the moving contact or damage to the support structure of the stationary contact; long-term inconsistent positioning may cause the operating mechanism to loosen or deform, ultimately leading to malfunctions such as failure to operate or accidental operation.

[0005] Misalignment of the contact surface leads to a reduction in the effective contact area, an increase in resistance, and can cause localized overheating or even contact welding.

[0006] The location of the electric arc can change randomly, potentially exceeding the effective range of the arc extinguishing device, leading to arc extinguishing failure or reignition, which threatens equipment safety. Utility Model Content

[0007] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a moving contact mechanism and a circuit breaker.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A moving contact mechanism, comprising:

[0010] The contact support is rotatably disposed within the housing of the circuit breaker and has a first surface for mounting the moving contact and torsion spring and a second surface for mounting the latch and trip latch. The first surface has a recessed first mounting surface, a positioning shaft is provided on the first mounting surface, and a mating wall is provided on one side of the first mounting surface, the mating wall having a positioning groove.

[0011] The moving contact has a circular hole adapted to the positioning shaft and is mounted on the first mounting surface. The moving contact extends to the side facing the stationary contact to form a positioning block, and the positioning block is adapted to the positioning groove.

[0012] A torsion spring is sleeved on the positioning shaft, with one end overlapping the contact support and the other end overlapping the moving contact.

[0013] A latch is rotatably located on the second side of the contact support;

[0014] The jumper is rotatably located on the second side of the contact support and engages with the latch.

[0015] The moving contact extends to the side away from the stationary contact to form a terminal.

[0016] The surface of the terminal block is provided with several grooves.

[0017] The front side of the terminal is provided with intersecting wire grooves.

[0018] The positioning block is positioned close to the circular hole.

[0019] The width of the opening of the positioning groove is adapted to the thickness of the positioning block.

[0020] A circuit breaker comprising:

[0021] The housing has terminals on both the front and rear sides;

[0022] An arc-extinguishing chamber is disposed within the housing.

[0023] The stationary contact assembly is disposed at the front end of the arc-extinguishing chamber;

[0024] The aforementioned moving contact mechanism is rotatably disposed within the housing and can contact or disconnect from the stationary contact assembly under the action of external force;

[0025] An electromagnetic tripping mechanism is disposed above the arc-extinguishing chamber and is correspondingly disposed to the moving contact mechanism;

[0026] The handle is rotatably mounted inside the housing and is linked to the moving contact mechanism via a connecting rod.

[0027] The beneficial effects of this utility model are as follows: This application utilizes the positioning block of the moving contact and the positioning groove of the contact support to limit the swing of the moving contact on the contact bracket, ensuring that the position of the moving contact and the stationary contact is always consistent each time. The contact position is the same each time, the oxidation or contamination degree of the contact surface is consistent, the contact resistance fluctuation is small, heat generation and energy loss are reduced, the arc is always generated in a fixed position, the arc extinguishing device (such as arc extinguishing chamber, magnetic blow-out coil) can be precisely designed, the arc is quickly cut off, the breaking capacity is improved, the mechanical stress concentration area is fixed, the contact material wear is uniform, excessive local wear is avoided, and the overall service life is extended. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the second side of the moving contact mechanism of this utility model.

[0029] Figure 2 This is a schematic diagram of the first side of the moving contact mechanism of this utility model.

[0030] Figure 3 for Figure 2 A cross-sectional view at point AA.

[0031] Figure 4 This is a cross-sectional view of the moving contact mechanism from another direction.

[0032] Figure 5 This is a schematic diagram of the structure of the moving contact of this utility model.

[0033] Figure 6 This is a schematic diagram of the contact support structure of this utility model.

[0034] Figure 7 This is a cross-sectional view of the positioning groove of the contact bracket of this utility model.

[0035] Figure 8 This is a schematic diagram of the circuit breaker of this utility model. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0037] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0038] like Figure 1 and Figure 2 As shown, this utility model provides a moving contact mechanism, which is mainly used in circuit breakers and can swing relative to the stationary contact under the action of external force to realize the opening and closing action.

[0039] The moving contact mechanism includes a contact support for bearing, a moving contact, a torsion spring for giving the moving contact a relative swing angle, a latch, and a jumper, wherein the latch and jumper are located on one side of the contact support, and the moving contact is restricted to the other side of the contact support by the torsion spring, and are set independently of each other.

[0040] like Figure 6 As shown, a contact support 100 is rotatably disposed within the circuit breaker housing 10. It has a first surface 120 for mounting the moving contact 200 and torsion spring 500, and a second surface 110 for mounting the latch 400 and trip latch 300. The first surface 110 has a recessed first mounting surface 140, on which a positioning shaft 150 is provided. A mating wall 160 is provided on one side of the first mounting surface 140, and a positioning groove 130 is provided on the mating wall 160. A second mounting surface is recessed at the second surface to accommodate a rotating shaft that engages with the latch. The latch portion is embedded in the second mounting surface, contacting it and allowing rotation relative to the contact. The trip latch... It is installed on the upper end of the contact support, which overlaps with the latch. This structure is conventional and will not be described in detail. For the first surface of the contact support, its lower end is recessed to form a first mounting surface. A mating wall is provided on the side of the first mounting surface near the stationary contact, which serves to restrict the moving contact. To ensure the reliability of the moving contact and the contact support, a positioning groove 130 is provided on the mating wall. A positioning block formed at the front end of the moving contact rotates relative to the positioning groove, and its thickness is restricted by the positioning groove, thus restricting the swing of the moving contact. This swing refers to the swing of the moving contact along its thickness direction, while the relative rotation of the moving contact is not restricted by the positioning groove. Figure 4 As shown, the length direction of the positioning groove can be adapted to the relative rotation of the positioning block.

[0041] like Figure 5As shown, the moving contact 200 has a circular hole 220 that is adapted to the positioning shaft 150. It is installed on the first mounting surface 140. The moving contact 200 extends to the side facing the stationary contact to form a positioning block 210. The positioning block 210 is adapted to the positioning groove 130. The positioning block is arranged in an arc upward and its lower end is arc-shaped, which allows it to rotate better in the positioning groove. At the same time, the positioning groove can also limit the maximum rotation angle of the moving contact.

[0042] A torsion spring 500 is sleeved on the positioning shaft 150, with one end overlapping the contact support 100 and the other end overlapping the moving contact 200. The torsion spring provides a force for the moving contact to reset.

[0043] The latch 400 is rotatably located on the second surface 110 of the contact support 100.

[0044] The jump buckle 300 is rotatably disposed on the second surface 110 of the contact support 100 and overlaps with the latch 400.

[0045] like Figure 5 As shown, the moving contact 200 extends to form a terminal 230 on the side away from the stationary contact. The terminal is used for wiring. At the same time, the surface of the terminal 230 is provided with several grooves 240 to increase friction and make the wiring more reliable. The front side of the terminal 230 is provided with intersecting wire grooves 250. The design of the wire grooves is to realize welding positioning.

[0046] The positioning block 210 is positioned close to the circular hole 220, so that the positioning block can better cooperate with the positioning groove.

[0047] The width of the opening of the positioning groove 130 is adapted to the thickness L of the positioning block 210, such as... Figure 3 and Figure 7 As shown, the upper end face of the positioning groove and the first mounting surface are used to limit the swing of the moving contact. Its thickness L is slightly larger than the thickness of the moving contact, so that the moving contact can be better installed during installation.

[0048] like Figure 8 As shown, a circuit breaker includes:

[0049] The housing 10 has terminals 20 on both its front and rear sides for connecting incoming and outgoing lines.

[0050] An arc-extinguishing chamber 30 is disposed inside the housing 10 and is used to extinguish the electric arc generated when the moving and stationary contacts are opened.

[0051] The stationary contact assembly 40 is disposed at the front end of the arc-extinguishing chamber 30 to facilitate the introduction of the generated electric arc into the arc-extinguishing chamber;

[0052] The aforementioned moving contact mechanism 50 is rotatably disposed within the housing 10 and can contact or disconnect from the stationary contact assembly 40 under the action of external force. That is, it can be opened or closed by the action of the handle, or it can be opened by the action of the electromagnetic tripping mechanism or the double gold sheet tripping mechanism.

[0053] An electromagnetic tripping mechanism 60 is disposed above the arc-extinguishing chamber 30 and is disposed corresponding to the moving contact mechanism 50;

[0054] The handle 70 is rotatably disposed within the housing 10 and is linked to the moving contact mechanism 50 via a connecting rod.

[0055] The embodiments should not be regarded as limitations on the present invention, but any improvements made based on the spirit of the present invention should be within the protection scope of the present invention.

Claims

1. A moving contact mechanism, characterized by: It includes: A contact support (100) is rotatably disposed within the housing (10) of the circuit breaker and has a first surface (120) for mounting a moving contact (200) and a torsion spring (500) and a second surface (110) for mounting a latch (400) and a trip latch (300). The first surface (110) has a recessed first mounting surface (140), a positioning shaft (150) is provided on the first mounting surface (140), and a mating wall (160) is provided on one side of the first mounting surface (140), and a positioning groove (130) is provided on the mating wall (160). The moving contact (200) has a circular hole (220) adapted to the positioning shaft (150), which is mounted on the first mounting surface (140), and the moving contact (200) extends to the side facing the stationary contact to form a positioning block (210), which is adapted to the positioning groove (130); A torsion spring (500) is sleeved on the positioning shaft (150), with one end overlapping the contact support (100) and the other end overlapping the moving contact (200); The latch (400) is rotatably disposed on the second side (110) of the contact support (100). The jumper (300) is rotatably disposed on the second side (110) of the contact support (100) and overlaps with the latch (400).

2. A moving contact mechanism according to claim 1, characterized in that: The moving contact (200) extends to the side away from the stationary contact to form a terminal (230).

3. A moving contact mechanism according to claim 2, characterized in that: The terminal (230) has several grooves (240) on its surface.

4. A moving contact mechanism according to claim 3, characterized in that: The front side of the terminal (230) is provided with intersecting wire grooves (250).

5. A moving contact mechanism according to claim 1, characterized in that: The positioning block (210) is positioned near the circular hole (220).

6. A moving contact mechanism according to claim 1, characterized in that: The width of the opening of the positioning groove (130) is adapted to the thickness of the positioning block (210).

7. A circuit breaker characterized by: It includes: The housing (10) has terminals (20) on both the front and rear sides. An arc-extinguishing chamber (30) is disposed within the housing (10); A stationary contact assembly (40) is disposed at the front end of the arc-extinguishing chamber (30); The moving contact mechanism (50) according to any one of claims 1 to 6 is rotatably disposed within the housing (10) and can contact or disconnect from the stationary contact assembly (40) under the action of external force; An electromagnetic tripping mechanism (60) is disposed above the arc-extinguishing chamber (30) and is disposed corresponding to the moving contact mechanism (50); The handle (70) is rotatably disposed within the housing (10) and is linked to the moving contact mechanism (50) via a connecting rod.

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