Split type contact structure and circuit breaker with same

Abstract

The utility model discloses a split-type contact structure and a circuit breaker with the same, the split-type contact structure comprises a static contact assembly and a bottom plate, the static contact assembly comprises an upper support, a lower support, a copper bar, a static contact, an arc baffle and a static arc contact module, the static arc contact module comprises a static arc contact and a static arc contact, and the static arc contact module comprises a static arc contact and a static arc contact. The upper support and the lower support are installed on the upper side and the lower side of the front portion of the copper bar, the static contact and the static arc contact are installed on the front end face of the copper bar and the front end face of the static arc contact respectively, the static arc contact is conducted with the static contact, the circuit breaker comprises the structure, a moving contact corresponding to the structure and an arc extinguish chamber, and the arc extinguish chamber is installed above the static arc contact and the moving arc contact. Through the scheme, the problems of long arc extinguishing time, low direct current short circuit breaking index and unreliable service life in the prior art are solved, and the technical effects of shortening the arc extinguishing time, improving the direct current short circuit breaking index and prolonging the service life of the circuit breaker are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical equipment components, in particular to a split contact structure of a DC frame type circuit breaker and a circuit breaker with the structure. Background Art

[0002] Circuit breakers are commonly used in low-voltage power distribution systems to connect and disconnect loads and protect the safety of lines and equipment. They belong to the category of low-voltage electrical appliances. The DC frame circuit breakers currently on the market usually replace the AC electronic release and arc extinguishing chamber with a DC release and a DC dedicated arc extinguishing chamber on the existing AC platform to obtain the DC short-circuit or rated current breaking performance.

[0003] Each static contact assembly module is designed with only one static contact, and there is no arc contact design. In the closed state, the static contact contacts the moving contact to achieve conduction. When the moving contact opens, the arc needs to move upward for a long distance after being generated from the static contact before it can enter the arc extinguishing chamber and extinguish. The long distance in this process is not conducive to the rapid extinguishing of the arc.

[0004] That is, since the original contact system is not adjusted, this solution has the disadvantages of difficulty in improving the DC short-circuit breaking index and unreliable life. In addition, the rated voltage in the current new energy storage system is usually about DC 1500V, and the increase in voltage further amplifies the above disadvantages. Utility Model Content

[0005] In view of the deficiencies of the prior art, the utility model provides a split static contact assembly and a circuit breaker with the assembly to solve the problems of the prior art such as long arc extinguishing time, low DC short-circuit breaking index and unreliable life.

[0006] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] A split contact structure comprises a static contact assembly and a base plate, wherein the static contact assembly comprises a lower bracket, a copper bar, and a static contact, wherein the static contact is mounted on the front end surface of the copper bar, wherein the lower bracket is an inverted L-shaped plate-like material and is mounted on the lower front side of the copper bar through a horizontal side surface, wherein a screw hole is provided on the vertical side surface of the lower bracket and is mounted on the inner side of the base plate through the screw hole, wherein the static contact assembly further comprises an arc baffle, a static arc contact module and an upper bracket, wherein the upper bracket is an L-shaped plate-like conductive material and is mounted on the upper front side of the copper bar through a horizontal side surface, wherein a screw hole is provided on the vertical side surface of the upper bracket, wherein the arc baffle is an insulating material and the lower part is a box-shaped type with an open bottom and back surface and can wrap around the upper bracket, wherein the upper part is a vertical straight cylinder with an open top and bottom surface, and the upper part is connected with the lower part through the bottom, The upper part of the vertical straight cylindrical back side of the arc baffle plate is closed and has a screw hole. The static arc contact module includes a static arc contact and a static arc contact. The static arc contact is an inverted L-shaped strip of conductive material and a corresponding threaded hole is arranged on the back side corresponding to the vertical side of the upper bracket and the screw hole position on the arc baffle plate. The vertical strip-shaped part of the static arc contact penetrates into the vertical straight cylindrical part of the arc baffle plate from above and makes the static arc contact contact with the upper bracket. The horizontal strip-shaped part of the static arc contact extends forward from the upper part of the vertical straight cylindrical part of the arc baffle plate. The static arc contact is installed on the front end surface of the horizontal strip-shaped part of the static arc contact. The bottom plate is provided with screw holes corresponding to the vertical side of the upper bracket and the screw hole position on the arc baffle plate. The screws pass through the bottom plate, the upper bracket or the arc baffle plate from the outside of the bottom plate and are fastened in the threaded hole of the static arc contact.

[0008] Preferably, the static contact is installed on the front end surface of the copper busbar by welding.

[0009] Preferably, the static arc contact is mounted on the front end surface of the horizontal strip portion of the static arc contact by welding.

[0010] Preferably, the static arc contact is made of copper or aluminum.

[0011] Preferably, the static contact is a silver-nickel alloy.

[0012] Preferably, the static arc contact is copper-tungsten alloy.

[0013] Preferably, the upper bracket and the lower bracket are provided with screw holes greater than 1 on the horizontal sides, and the same number of screw holes are also provided at corresponding positions on the front of the copper busbar. The upper bracket and the lower bracket are respectively installed on the upper and lower sides of the copper busbar using screws and nuts through the screw holes on the horizontal sides.

[0014] Preferably, a sunken step is provided on the front upper surface of the copper busbar, and the upper bracket is installed on the sunken step.

[0015] Preferably, two top corners of the vertical side of the upper bracket are provided with linear chamfers, and a triangular cover portion that can wrap the linear chamfers of the upper bracket is provided between the top sides of the box-shaped lower portion of the arc baffle and the side surfaces of the vertical straight cylindrical upper portion.

[0016] Based on the same inventive concept, the present application also uses the following scheme:

[0017] A circuit breaker with a split contact structure comprises a moving contact, an arc extinguishing chamber, and the above-mentioned split contact structure, wherein the moving contact comprises a moving contact point and a moving arc contact, the moving contact point and the moving arc contact are arranged up and down corresponding to a static contact point and a static arc contact, the axis of the moving contact is arranged at the lower side of the static contact assembly, the arc extinguishing chamber is installed above the static arc contact and the moving arc contact, and when disconnecting, the static arc contact and the moving arc contact are separated after the static contact and the moving contact are separated.

[0018] The present application proposes a split contact structure of a DC frame type circuit breaker and a circuit breaker with the structure. In each static contact assembly module, a static contact is designed. Above the static contact, a static arc contact module is newly designed. The static arc contact module includes a static arc contact and a static arc contact. After installation and fixation, the static arc contact contacts the upper bracket. Since the upper bracket is made of conductive materials, after the static contact module is installed on the base plate, the static contact and the static arc contact form a conductive state. By using the static contact module of this solution, in conjunction with the corresponding moving contact, it can be achieved that when the moving contact is opened, the static contact is first separated from the moving contact, and then the static arc contact is separated from the moving arc contact. The arc is generated at the position that is separated later. At this time, the position where the arc is generated is closer to the arc extinguishing chamber, and the time taken for the arc to enter the arc extinguishing chamber is also shorter. The DC circuit breaker adopting this solution has an arcing time that is significantly better than the AC platform solution in the prior art when breaking the rated current during short-circuit breaking, achieving the technical effects of shortening the arc extinguishing time, improving the DC short-circuit breaking index and increasing the life of the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of a three-dimensional structure of an embodiment of a static contact assembly of the present application installed on a bottom plate;

[0020] Figure 2 This is a schematic diagram of a three-dimensional structure of an assembled static contact assembly according to an embodiment of the present application;

[0021] Figure 3 This is a schematic diagram of an exploded three-dimensional structure of an embodiment of a static contact assembly of the present application from a first perspective;

[0022] Figure 4 It is a schematic diagram of an exploded three-dimensional structure of another perspective of an embodiment of a static contact assembly of the present application;

[0023] Figure 5 This is a schematic diagram of the inner three-dimensional structure of an embodiment of the base plate of the present application;

[0024] Figure 6 A cross-sectional schematic diagram of an embodiment of a circuit breaker of the present application;

[0025] Figure 7 A schematic diagram of a three-dimensional structure in which a static contact is installed on a base plate in the prior art;

[0026] Figure 8 It is a schematic diagram of the three-dimensional structure of the assembled static contact assembly in the prior art;

[0027] Fig. 9 It is a schematic diagram of the exploded three-dimensional structure of a static contact assembly in the prior art;

[0028] Fig.10 It is a cross-sectional schematic diagram of a circuit breaker in the prior art;

[0029] Among them, 1-static contact assembly, 11-arc baffle plate, 12-static arc contact module, 121-static arc contact, 122-static arc contact, 13-upper bracket, 14-lower bracket, 15-copper busbar, 16-static contact, 17-arc striking plate, 2-bottom plate, 21-screw hole, 3-moving contact, 31-moving contact, 32-moving arc contact, 4-arc extinguishing chamber, 5-arc. DETAILED DESCRIPTION

[0030] 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 of the embodiments.

[0031] The present embodiment provides a technical solution: the split contact structure of the utility model includes three groups of static contact assemblies 1 and a base plate 2, each group of the static contact assembly 1 includes an arc baffle 11, a static arc contact module 12, an upper bracket 13, a lower bracket 14, a copper bar 15, and a static contact 16, wherein the static contact 16 is installed on the front end surface of the copper bar 15 by welding, the lower bracket 14 is an inverted L-shaped plate material and is installed on the lower side of the front part of the copper bar 15 through the horizontal side, and a screw hole is opened on the vertical side of the lower bracket 14 and is installed on the inner side of the base plate 2 through the screw hole The upper bracket 13 is an L-shaped plate-shaped conductive material and is installed on the upper front side of the copper bus 15 through the horizontal side. Screw holes are opened on the vertical side of the upper bracket 13. The arc baffle 11 is an insulating material and the lower part is a box-shaped with an open bottom and back surface that can wrap the upper bracket 13. The upper part is a vertical straight cylinder with open top and bottom surfaces. The upper part is connected with the lower part through the bottom. In this embodiment, the two top corners of the vertical side of the upper bracket 13 are also chamfered with straight lines. A space is provided between the two sides of the top surface of the lower box of the arc baffle 11 and the side of the upper part of the vertical straight cylinder. The upper bracket 13 is wrapped with a triangular cover with two straight lines and large chamfers; the upper part of the vertical straight cylindrical back of the arc baffle plate 11 is closed and has screw holes; the static arc contact module 12 includes a static arc contact 122 and a static arc contact 121; the static arc contact 122 is an inverted L-shaped strip of conductive material and has corresponding threaded holes on the back corresponding to the vertical side of the upper bracket 13 and the screw holes on the arc baffle plate 11; in this embodiment, the static arc contact 122 is made of copper, and of course aluminum can also be used; the vertical strip part of the static arc contact 122 penetrates into the arc baffle plate from above The vertical straight cylinder portion of 11 makes the bottom and back surfaces of the static arc contact 122 contact with the upper bracket 13, and the horizontal strip portion of the static arc contact 122 extends forward from the upper portion of the vertical straight cylinder portion of the arc baffle plate 11. The static arc contact 121 is also installed on the front end surface of the horizontal strip portion of the static arc contact 122 by welding. The bottom plate 2 is provided with screw holes 21 corresponding to the vertical side surfaces of the upper bracket 13 and the screw holes on the arc baffle plate 11. The screws pass through the bottom plate 2, the upper bracket 13 or the arc baffle plate 11 from the outside of the bottom plate 2 and are fastened in the threaded holes of the static arc contact 122.

[0032] This solution does not limit the fixed connection method between the upper and lower brackets and the copper bar. For the convenience of installation, this embodiment uses a conventional fastener connection method. Two screw holes are opened on the horizontal side of the upper bracket 13 and the lower bracket 14, and the same number of screw holes are opened at the corresponding position of the front of the copper bar 15. The upper bracket 13 and the lower bracket 14 are respectively installed on the upper and lower sides of the copper bar 15 through the screw holes on the horizontal side using screws and nuts. The upper surface of the front of the copper bar 15 is also provided with a sunken step, and the upper bracket 13 is installed on the sunken step. As for the material of the contact, the static contact 16 in this embodiment uses silver-nickel alloy, and the static arc contact 121 uses copper-tungsten alloy.

[0033] Based on the same inventive concept, the present application also discloses a circuit breaker with a split contact structure, including the above-mentioned split contact structure, three groups of moving contacts 3, and an arc extinguishing chamber 4, each group of the moving contacts 3 is also a component, including a moving contact 31 and a moving arc contact 32, the moving contact 31 and the moving arc contact 32 are arranged up and down corresponding to the static contact 16 and the static arc contact 121, the axis of the moving contact 3 is arranged at the lower side of the static contact assembly 1, and the arc extinguishing chamber 4 is installed at a position close to the static arc contact 121 and the moving arc contact 32. In this embodiment, the static arc contact 121 and the moving arc contact 32 are both arranged On the moving contact finger, the lower part of the moving contact finger is connected to the moving contact support through the moving contact finger shaft. A spring is also arranged on the inner side of the moving contact finger and connected to the moving contact support. The moving contact support and the moving contact finger rotate as a whole around the axis of the moving contact, thereby ensuring that the static arc contact 121 and the moving arc contact 32 are disengaged after the static contact 16 and the moving contact 31 are disengaged during disconnection. Of course, other structures can also be used to achieve the same function. During disconnection, since the static arc contact 121 and the moving arc contact 32 are disengaged after the static contact 16 and the moving contact 31 are disengaged, an arc 5 is generated between the static arc contact 121 and the moving arc contact 32.

[0034] In the description of the present invention, 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 invention 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 operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0035] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A split contact structure, comprising a static contact assembly (1) and a base plate (2), wherein the static contact assembly (1) comprises a lower bracket (14), a copper bar (15), and a static contact (16), wherein the static contact (16) is mounted on the front end surface of the copper bar, the lower bracket (14) is an inverted L-shaped plate material and is mounted on the lower front side of the copper bar (15) through a horizontal side surface, and a screw hole is opened on the vertical side surface of the lower bracket (14) and is mounted on the inner side of the base plate (2) through the screw hole, characterized in that: The static contact assembly (1) also includes an arc baffle (11), a static arc contact module (12) and an upper bracket (13); the upper bracket (13) is made of an L-shaped plate-shaped conductive material and is installed on the upper front side of the copper busbar (15) through a horizontal side surface; a screw hole is provided on the vertical side surface of the upper bracket (13); the arc baffle (11) is made of an insulating material and the lower part is a box-shaped box with an open bottom and back surface that can wrap around the upper bracket (13); the upper part is a vertical straight cylinder with an open top and bottom surface; the upper part is connected to the lower part through the bottom; the upper part of the vertical straight cylinder of the arc baffle (11) is closed and has a screw hole; the static arc contact module (12) includes a static arc contact (122) and a static arc contact point (121); the static arc contact (122) is made of an inverted L-shaped strip-shaped conductive material and the back surface corresponds to the upper bracket (13) Corresponding threaded holes are provided at the positions of the screw holes on the vertical side surface and the arc baffle plate (11); the vertical strip portion of the static arc contact (122) penetrates into the vertical straight tube portion of the arc baffle plate (11) from above and makes the static arc contact (122) contact the upper bracket (13); the horizontal strip portion of the static arc contact (122) extends forward from the upper part of the vertical straight tube portion of the arc baffle plate (11); the static arc contact (121) is installed on the front end surface of the horizontal strip portion of the static arc contact (122); the bottom plate (2) is provided with screw holes (21) corresponding to the positions of the screw holes on the vertical side surface of the upper bracket (13) and the arc baffle plate (11); the screws pass through the bottom plate (2), the upper bracket (13) or the arc baffle plate (11) from the outside of the bottom plate (2) and are fastened in the threaded holes of the static arc contact (122).

2. The split contact structure according to claim 1, characterized in that: The static contact (16) is mounted on the front end surface of the copper busbar (15) by welding.

3. The split contact structure according to claim 1, characterized in that: The static arc contact (121) is mounted on the front end surface of the horizontal strip portion of the static arc contact (122) by welding.

4. The split contact structure according to claim 1, characterized in that: The static arc contact (122) is made of copper or aluminum.

5. The split contact structure according to claim 4, characterized in that: The static contact (16) is a silver-nickel alloy.

6. The split contact structure according to claim 1, characterized in that: The static arc contact (121) is made of copper-tungsten alloy.

7. The split contact structure according to claim 1, characterized in that: The upper bracket (13) and the lower bracket (14) are provided with screw holes greater than one on the horizontal side surfaces, and the corresponding positions on the front of the copper busbar (15) are also provided with screw holes of the same number. The upper bracket (13) and the lower bracket (14) are respectively installed on the upper side and the lower side of the copper busbar (15) by using screws and nuts through the screw holes on the horizontal side surfaces.

8. The split contact structure according to claim 1, characterized in that: The front upper surface of the copper busbar (15) is provided with a sunken step, and the upper bracket (13) is installed on the sunken step.

9. The split contact structure according to claim 1, characterized in that: The two top corners of the vertical side of the upper bracket (13) are provided with linear chamfers, and a triangular cover portion capable of wrapping the linear chamfers of the upper bracket (13) is provided between the top sides of the box-shaped lower portion of the arc baffle (11) and the side surfaces of the vertical straight cylindrical upper portion.

10. A circuit breaker with a split contact structure, comprising a moving contact (3) and an arc extinguishing chamber (4), characterized in that: It also includes the split contact structure as described in any one of claims 1 to 9, the moving contact (3) includes a moving contact (31) and a moving arc contact (32), the moving contact (31) and the moving arc contact (32) are arranged up and down corresponding to the static contact (16) and the static arc contact (121), the axis of the moving contact (3) is arranged at the lower side of the static contact assembly (1), the arc extinguishing chamber (4) is installed above the static arc contact (121) and the moving arc contact (32), and when disconnected, the static arc contact (121) and the moving arc contact (32) are disengaged after the static contact (16) and the moving contact (31) are disengaged.

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