Moving contact assembly, contact mechanism and circuit breaker

Abstract

The utility model discloses a moving contact assembly, a contact mechanism and a circuit breaker, the moving contact assembly comprises a rotating shaft and a moving contact, the middle part of the rotating shaft is provided with a contact cavity, the moving contact is rotatably assembled in the contact cavity, one end of the moving contact is located outside the contact cavity and is provided with a moving contact, and the moving contact assembly also comprises a baffle plate coaxially connected with the moving contact. The baffle comprises at least one connecting arm, the connecting arm is attached and fixed to the side wall of the moving contact, a shielding part is arranged at the position, close to the end, of the connecting arm, and the shielding part is located in the contact cavity and stretches across and covers the middle area, back to the moving contact, of the moving contact. In the utility model, the baffle plate is coaxially connected with the moving contact, so that the baffle plate synchronously acts along with the moving contact, meanwhile, the connecting arm is attached to the side wall of the moving contact, and the shielding part is positioned in the contact cavity, so that the baffle plate is prevented from interfering with the rotating shaft and the shell, and the moving contact can be ensured to be repelled to the maximum angle.

Description

Technical Field

[0001] The utility model relates to the field of low-voltage electrical appliances, in particular to a moving contact assembly, a contact mechanism and a circuit breaker. Background Art

[0002] A low-voltage circuit breaker is a switching device that can not only connect and disconnect normal load current and overload current, but also connect and disconnect short-circuit current. When a short-circuit fault occurs in the circuit, the short-circuit current can repel the contact mechanism, that is, a large electric repulsion force will be generated between the moving contact and the static contact of the contact mechanism, separating the moving contact from the static contact. This electric repulsion force is generated instantly and is strong, so that the movement of the moving contact is significantly earlier than the movement of the rotating shaft driven by the operating mechanism.

[0003] In existing products, the moving contact and the rotating shaft usually have the same rotation center, while the baffle installed on the moving contact is not consistent with the rotation center of the rotating shaft, and the baffle is usually located outside the rotating shaft and fits the surface of the rotating shaft. In this way, when the moving contact moves before the rotating shaft, some structures in the baffle will interfere with the rotating shaft and the base, causing the contacts to be repelled at too small an angle or unable to be repelled, causing a large degree of damage to the moving contact and the static contact. Summary of the invention

[0004] The utility model aims to overcome at least one defect of the prior art and provides a moving contact assembly, a contact mechanism and a circuit breaker.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The utility model provides a moving contact assembly, including a rotating shaft and a moving contact, a contact cavity is arranged in the middle of the rotating shaft, the moving contact is rotatably assembled in the contact cavity, one end of the moving contact is located outside the contact cavity and is provided with a moving contact point, and also includes a baffle coaxially connected to the moving contact, the baffle includes at least one connecting arm, the connecting arm is fitted and fixed to the side wall of the moving contact, the connecting arm is connected to a shielding portion, the shielding portion is located in the contact cavity and spans over the middle area of ​​the moving contact facing away from the moving contact point.

[0007] Preferably, a positioning portion is protrudingly provided in the middle of one side of the moving contact facing away from the moving contact, and a positioning cavity for accommodating the positioning portion is formed in the middle of the shielding portion.

[0008] Preferably, a slot is provided at the junction between the positioning portion and the moving contact, and the slot is engaged with the edge of the shielding portion.

[0009] Preferably, at least one arc-shaped protrusion is protruding from the middle of one side of the moving contact provided with the moving contact point, and the arc-shaped protrusion is located in the contact cavity.

[0010] Preferably, the moving contact includes a plurality of moving contact pieces arranged in parallel, the baffle includes a plurality of connecting arms arranged in parallel, two adjacent moving contact pieces are separated by a connecting arm, and the shielding portion spans across and covers the middle regions of the plurality of moving contacts facing away from the moving contacts, and spans the middle regions of the plurality of connecting arms.

[0011] Preferably, at least one connecting portion is provided in the middle of each moving contact piece, and the connecting portion is connected to the shielding portion and / or the connecting arm.

[0012] Preferably, a moving contact is provided on the end side of one end of the moving contact piece, and the middle side of the moving contact piece facing away from the moving contact protrudes outward to form a positioning protrusion, and a slot is provided at the connection between the positioning protrusion and the moving contact piece, and the middle side of the moving contact piece facing away from the positioning protrusion protrudes outward to form an arc-shaped protrusion.

[0013] Preferably, a guide portion is provided at one end of one or two moving contact pieces located in the middle position, and the guide portion is located on a side wall of the moving contact piece facing away from the moving contact point.

[0014] Preferably, the baffle includes at least three spaced connection arms and a shielding portion, a contact sheet gap is left between two adjacent connection arms, and a first connection hole and a second connection hole are provided in the middle of each connection arm.

[0015] The shielding portion includes a hollow fan-shaped cavity, a narrower end of the fan-shaped cavity is correspondingly connected to a connecting arm provided with a first connecting hole, a wider end of the fan-shaped cavity is provided with an arc-shaped convex surface, one side edge of the arc-shaped convex surface spans all connecting arms, and the opening of the fan-shaped cavity is located on the side facing the moving contact.

[0016] The utility model also provides a contact mechanism, comprising a stationary contact, wherein the stationary contact comprises a stationary contact plate, one end of the stationary contact plate is provided with a stationary contact point, and also comprises the moving contact assembly as described above, wherein the moving contact is spaced opposite to the stationary contact.

[0017] The utility model also provides a circuit breaker, comprising a shell, wherein an operating mechanism and at least one circuit breaker pole are arranged in the shell, wherein the circuit breaker pole comprises a pair of wiring terminals, wherein the contact mechanism as described above is arranged between the pair of wiring terminals, and the moving contact and the static contact are electrically connected to the pair of wiring terminals respectively.

[0018] In the movable contact assembly, contact mechanism and circuit breaker of the utility model, the baffle is coaxially connected with the movable contact, so that the baffle moves synchronously with the movable contact. At the same time, the connecting arm is arranged to fit the side wall of the movable contact, and the shielding part is located in the contact cavity, so as to avoid mutual interference between the baffle and the rotating shaft and the housing, and ensure that the movable contact is repelled to the maximum angle.

[0019] In addition, a positioning portion and a positioning cavity that cooperate with each other are provided between the shielding portion and the moving contact, which further ensures the connection stability between the baffle and the moving contact.

[0020] In addition, the moving contact piece in the moving contact and the connecting arm in the baffle are arranged at intervals, which improves the connection stability between the moving contact and the baffle and ensures the consistency of the movements of multiple moving contact pieces.

[0021] In particular, the connecting portion of each moving contact piece is connected to the connecting arm and / or the shielding portion, which further ensures the connection stability and synchronization between the moving contact and the baffle. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a cross-sectional view of the rotating shaft and the moving contact in the utility model;

[0023] Figure 2 It is a structural schematic diagram of the moving contact and the baffle in the utility model;

[0024] Figure 3 It is an exploded schematic diagram of the moving contact and the baffle in the utility model;

[0025] Figure 4 It is a structural schematic diagram of the baffle in the utility model;

[0026] Figure 5 It is a structural schematic diagram of the first moving contact piece in the utility model;

[0027] Figure 6 It is a structural schematic diagram of the second moving contact piece in the utility model;

[0028] Reference numerals:

[0029] 1-shaft, 11-contact cavity, 2-moving contact, 20-moving contact piece, 201-first moving contact piece, 202-second moving contact piece, 21-moving contact point, 22-positioning protrusion, 23-slot, 24-guide portion, 25-arc-shaped protrusion, 26-first connecting portion, 27-second connecting portion, 3-baffle, 301-first connecting hole, 302-second connecting hole, 31-connecting arm, 32-shielding portion, 321-arc-shaped convex surface. DETAILED DESCRIPTION

[0030] The following embodiments are combined with the accompanying drawings to further illustrate the specific implementation of the movable contact assembly, contact mechanism and circuit breaker of the present utility model. The movable contact assembly, contact mechanism and circuit breaker of the present utility model are not limited to the description of the following embodiments.

[0031] The circuit breaker comprises a shell, an operating mechanism and at least one circuit breaker pole are arranged in the shell, the operating mechanism is connected to an operating member, the operating member extends from an operating hole provided on the shell to the outside of the shell, and is used to manually drive the operating mechanism, each circuit breaker pole comprises a pair of wiring terminals and a contact mechanism connected between the pair of wiring terminals, the contact mechanism comprises a moving contact assembly and a stationary contact, wherein the moving contact assembly comprises a rotating shaft 1 and a moving contact 2, the rotating shaft 1 is rotatably assembled in the shell and is linked to the operating mechanism, a contact cavity 11 is arranged in the middle of the rotating shaft 1, the moving contact 2 is rotatably arranged in the contact cavity 11, one end of the moving contact 2 extends from the contact cavity 11 to the outside of the rotating shaft 1 and is provided with a moving contact 21, the stationary contact is fixed in the shell, the stationary contact is provided with a stationary contact spaced opposite to the moving contact 21, the driving operating mechanism drives the rotating shaft 1 to rotate, and the rotating shaft 1 drives the moving contact 2 to contact or separate with the stationary contact.

[0032] The improvement of the present application is that the moving contact assembly also includes a baffle 3 coaxially connected to the moving contact 2, the baffle 3 includes at least one connecting arm 31, the connecting arm 31 is fitted and fixed to the side wall of the moving contact 2, the connecting arm 31 is connected to a shielding portion 32, the shielding portion 32 is located in the contact cavity 11 and spans across and covers the middle area of ​​the moving contact 2 facing away from the moving contact 21. In this way, the baffle 3 is coaxially connected to the moving contact 2, so that the baffle 3 moves synchronously with the moving contact 2. At the same time, the connecting arm 31 is arranged to fit the side wall of the moving contact 2, and the shielding portion 32 is located in the contact cavity 11, so as to avoid mutual interference between the baffle 3 and the rotating shaft 1 and the housing, and can ensure that the moving contact 2 is repelled to the maximum angle.

[0033] Furthermore, a positioning portion is protruding from the middle of one side of the moving contact 2 facing away from the moving contact 21, and a positioning groove for accommodating the positioning portion is formed in the middle of the shielding portion 32. The mutual cooperation between the positioning portion and the positioning groove can ensure the connection stability between the baffle 3 and the moving contact 2.

[0034] Preferably, the moving contact 2 includes a plurality of moving contact pieces 20 arranged in parallel, and the baffle 3 includes a plurality of connecting arms 31 arranged in parallel. The shape of each connecting arm 31 is similar to the shape of each moving contact piece 20. Two adjacent moving contact pieces 20 are separated by a connecting arm 31. Such spacing between the moving contact piece 20 and the connecting arm 31 improves the connection stability between the moving contact piece 20 and the connecting arm 31, and makes the movements of the plurality of moving contact pieces 20 have better consistency. At the same time, the connection stability between the baffle 3 and the moving contact 2 is further ensured. The shielding portion 32 spans across and covers the middle regions of the plurality of moving contacts 2 facing away from the moving contact point 21, and spans the middle regions of the plurality of connecting arms 31. Of course, the moving contact 2 may also be an integral structure. In this case, the baffle 3 includes a pair of spaced connecting arms 31, and the moving contact 2 is disposed between the pair of connecting arms 31. Of course, it is also possible to only provide one connecting arm 31.

[0035] Combination Figure 1-6A specific embodiment of a moving contact assembly is provided.

[0036] like Figure 1-3 As shown, the moving contact assembly includes a rotating shaft 1 and a moving contact 2. A contact cavity 11 is opened in the middle of the rotating shaft 1. One end of the contact cavity 11 is provided with an opening. The middle of the moving contact 2 is rotatably connected to the contact cavity 11. One end of the moving contact 2 extends out of the rotating shaft 1 from the opening of the contact cavity 11 and is provided with a moving contact point 21. The other end of the moving contact 2 is located in the contact cavity 11 and can move in the rotation space reserved in the contact cavity 11. The moving contact 2 is also connected to a baffle 3, which is coaxially connected to the moving contact 2, that is, The baffle 3 and the moving contact 2 have the same rotation center, and the baffle 3 includes at least one connecting arm 31, which is fixed to the side wall of the moving contact 2. Preferably, the shape of the connecting arm 31 matches the shape of the side wall of the moving contact 2, and a shielding portion 32 is provided in the middle of the connecting arm 31. The shielding portion 32 is located in the contact cavity 11 and spans across and covers the middle area of ​​the moving contact 2 facing away from the moving contact 21, that is, the shielding portion 32 encloses a partial area of ​​the moving contact 2 to form a semi-enclosed structure.

[0037] In this embodiment, the moving contact 2 includes a plurality of moving contact pieces 20 arranged in parallel, and a moving contact point 21 is arranged on one end side of each moving contact piece 20, and the middle side of the moving contact piece 20 facing away from the moving contact point 21 protrudes outward to form a positioning protrusion 22. Figure 1 , 3 , 5 and 6, the positioning protrusion 22 is approximately trapezoidal, and a slot 23 is formed at the junction of the positioning protrusion 22 and the middle side wall of the moving contact piece 20. The slot 23 is closer to the end where the moving contact point 21 is provided, and the edge of the shielding portion 32 can be engaged with the slot 23. When multiple moving contact pieces 20 are arranged in parallel, all the positioning protrusions 22 form a positioning portion; the middle side of the moving contact piece 20 facing away from the positioning protrusion 22 protrudes outward to form an arc-shaped protrusion 25, and the arc-shaped protrusion 25 and the moving contact point 21 are located on the same side of the moving contact piece 20. The arc-shaped protrusion 25 is located in the contact cavity 11 for connecting a contact spring (not shown); at least one connecting portion is provided in the middle of each moving contact piece 20, Figure 5 , 6 In the figure, a first connecting portion 26 and a second connecting portion 27 are provided in the middle of the moving contact piece 20, and the first connecting portion 26 and the second connecting portion 27 are arranged at intervals, wherein the first connecting portion 26 is closer to the end away from the moving contact 21, and the first connecting portion 26 is a circular hole, and the first connecting portion 26 is used to be coaxially assembled with the baffle 3 and the rotating shaft 1, specifically, the first connecting portion 26 is connected to the shielding portion 32 in the baffle 3; the second connecting portion 27 is located between the end with the moving contact 21 and the positioning protrusion 22, the second connecting portion 27 is a circular convex shaft, and the diameter of the second connecting portion 27 is smaller than the diameter of the first connecting portion 26, and the second connecting portion 27 is used to connect with the connecting arm 31 in the baffle 3.

[0038] Further, one end of one or two moving contact pieces 20 located in the middle position is provided with a guide portion 24, and the guide portion 24 is located on the side wall of the moving contact piece 20 facing away from the moving contact point 21. In this embodiment, for the convenience of description, the moving contact piece 20 is divided into a first moving contact piece 20 (see Figure 5 ) and the second moving contact piece 20 (see Figure 6 ), and the first moving contact piece 201 and the second moving contact piece 202 have similar structures, the moving contact 2 includes four first moving contact pieces 201 and one second moving contact piece 202, wherein the second moving contact piece 202 is located in the middle of the four first moving contact pieces 201, and a guide portion 24 is provided on the second moving contact piece 202. Of course, the two second moving contact pieces 202 may also be located in the middle of the four first moving contact pieces 201.

[0039] Combination Figure 2-4 A baffle plate 3 structure applied to the present embodiment is provided, the baffle plate 3 includes at least three spaced connecting arms 31 and a shielding portion 32. In the present embodiment, there are four connecting arms 31, the shape of each connecting arm 31 matches the shape of the moving contact piece 20, a contact piece gap is left between two adjacent connecting arms 31, a moving contact piece 20 is arranged in each contact piece gap, a first connecting hole 301 and a second connecting hole 302 are arranged in the middle of each connecting arm 31, the first connecting hole 301 and the second connecting hole 302 are respectively connected to the first connecting portion 26 and the second connecting portion 27 of the moving contact piece 20; the shielding portion 32 is located between the first connecting hole 301 and the second connecting hole 302. The shielding portion 32 includes a hollow fan-shaped cavity, and the narrower end of the fan-shaped cavity is correspondingly connected to the connecting arm 31 provided with the first connecting hole 301, and the wider end of the fan-shaped cavity is provided with an arcuate convex surface 321. Preferably, the curvature of the arcuate convex surface 321 is consistent with the curvature of the contact cavity 11, and one side edge of the arcuate convex surface 321 spans all the connecting arms 31. The edge of the arcuate convex surface 321 is preferably engaged with the slot 23 on the moving contact piece 20. The opening of the fan-shaped cavity is located on the side facing the moving contact 2, so that a plurality of positioning protrusions 22 form a positioning portion and extend into it from the opening of the fan-shaped cavity.

[0040] The static contact matched with the moving contact assembly can adopt the existing technology, specifically, the static contact includes a static contact plate, one end of the static contact plate is provided with a static contact, the number of static contacts can match the number of moving contacts 21, or only one static contact of a larger size is provided, and multiple moving contacts 21 are matched with the same static contact, and the static contact and the moving contact 2 are spaced relative to each other to form a contact mechanism of the circuit breaker pole, and each circuit breaker pole also includes a pair of wiring terminals, wherein the rotating shaft 1 is rotatably assembled, and the moving contact 2 and the static contact are electrically connected to the pair of wiring terminals respectively; other components are also provided in the circuit breaker pole, such as an arc extinguishing system, a short-circuit protection mechanism, and an overload protection mechanism.

[0041] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate directions or positional relationships based on directions or positional relationships shown in the drawings, or directions or positional relationships that are usually placed when in use, and are only for the convenience of description, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish descriptions, and cannot be understood as indicating relative importance.

[0042] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A moving contact assembly, comprising a rotating shaft (1) and a moving contact (2), wherein a contact cavity (11) is provided in the middle of the rotating shaft (1), the moving contact (2) is rotatably assembled in the contact cavity (11), one end of the moving contact (2) is located outside the contact cavity (11) and is provided with a moving contact point (21), characterized in that: The invention also comprises a baffle (3) coaxially connected to the moving contact (2), the baffle (3) comprising at least one connecting arm (31), the connecting arm (31) being fixedly attached to the side wall of the moving contact (2), the connecting arm (31) being connected to a shielding portion (32), the shielding portion (32) being located in the contact cavity (11) and spanning over and covering a middle region of the moving contact (2) facing away from the moving contact point (21).

2. The moving contact assembly according to claim 1, characterized in that: A positioning portion is protrudingly provided in the middle of one side of the moving contact (2) facing away from the moving contact point (21), and a positioning cavity for accommodating the positioning portion is formed in the middle of the shielding portion (32).

3. The moving contact assembly according to claim 2, characterized in that: A clamping groove (23) is provided at the connection point between the positioning portion and the moving contact (2), and the clamping groove (23) is clamped with the edge of the shielding portion (32).

4. The moving contact assembly according to claim 1, characterized in that: At least one arc-shaped protrusion (25) is protruding from the middle of one side of a moving contact (2) provided with a moving contact point (21), and the arc-shaped protrusion (25) is located in the contact cavity (11).

5. The moving contact assembly according to any one of claims 1 to 4, characterized in that: The moving contact (2) comprises a plurality of moving contact pieces (20) arranged in parallel, the baffle (3) comprises a plurality of connecting arms (31) arranged in parallel, two adjacent moving contact pieces (20) are separated by a connecting arm (31), and the shielding portion (32) spans across and covers the middle regions of the plurality of moving contacts (2) facing away from the moving contact point (21), and spans the middle regions of the plurality of connecting arms (31).

6. The moving contact assembly according to claim 5, characterized in that: At least one connecting portion is provided in the middle of each moving contact piece (20), and the connecting portion is connected to the shielding portion (32) and / or the connecting arm (31).

7. The moving contact assembly according to claim 6, characterized in that: A moving contact point (21) is arranged on the side surface of the end of one end of the moving contact piece (20); the middle side surface of the moving contact piece (20) opposite to the moving contact point (21) protrudes outward to form a positioning protrusion (22); a clamping groove (23) is arranged at the connection between the positioning protrusion (22) and the moving contact piece (20); the middle side surface of the moving contact piece (20) opposite to the positioning protrusion (22) protrudes outward to form an arc-shaped protrusion (25).

8. The moving contact assembly according to claim 7, characterized in that: A guide portion (24) is provided at one end of one or two moving contact pieces (20) located in the middle, and the guide portion (24) is located on the side wall of the moving contact piece (20) facing away from the moving contact point (21).

9. The moving contact assembly according to claim 1, characterized in that: The baffle (3) comprises at least three spaced connection arms (31) and a shielding portion (32), a contact sheet gap is left between two adjacent connection arms (31), and a first connection hole (301) and a second connection hole (302) are provided in the middle of each connection arm (31). The shielding portion (32) comprises a hollow fan-shaped cavity, wherein a narrower end of the fan-shaped cavity is correspondingly connected to a connecting arm (31) provided with a first connecting hole (301), and a wider end of the fan-shaped cavity is provided with an arc-shaped convex surface (321), and a side edge of the arc-shaped convex surface (321) spans across all connecting arms (31), and an opening of the fan-shaped cavity is located on a side facing the moving contact (2).

10. A contact mechanism, comprising a stationary contact, wherein the stationary contact comprises a stationary contact plate, one end of the stationary contact plate is provided with a stationary contact point, characterized in that: It also comprises a moving contact assembly as claimed in any one of claims 1 to 9, wherein the moving contact (2) is spaced apart from the stationary contact.

11. A circuit breaker, comprising a housing, wherein an operating mechanism and at least one circuit breaker pole are arranged in the housing, wherein the circuit breaker pole comprises a pair of connection terminals, wherein: A contact mechanism as claimed in claim 10 is arranged between a pair of wiring terminals, and the moving contact (2) and the stationary contact are electrically connected to the pair of wiring terminals respectively.

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