Arc isolation device for circuit breaker operating mechanism

Abstract

The present invention relates to the technical field of circuit breakers, and in particular discloses an arc-isolating device for a circuit breaker operating mechanism, including an arc-extinguishing chamber, the arc-extinguishing chamber including several layers of U-shaped arc-extinguishing plates, each arc-extinguishing plate is arranged in a row, each arc-extinguishing plate is fixed on two supporting plates arranged oppositely, and the two side arms of the arc-extinguishing plate are respectively covered with left and right arc-extinguishing covers, and the arc-extinguishing plate on the top layer is covered with an arc-isolating plate punched from insulating paperboard, and a flippable baffle is cut on the arc-isolating plate, and the baffle is aligned with the inner concave part of the arc-extinguishing plate. With the above structure, an arc-isolating device is provided, which prevents metal particles from splashing to other mechanisms and causing circuit breaker failure by arranging an arc-isolating plate on the arc-extinguishing chamber.

Description

Technical Field

[0001] The invention relates to the technical field of circuit breakers, in particular to an arc isolation device of a circuit breaker operating mechanism. Background Art

[0002] The circuit breaker is a very important electrical appliance in the low-voltage power distribution system. In addition to being able to normally connect and disconnect the current in the circuit, it can also provide overload and short-circuit protection for the circuit and the electrical appliances in the circuit. When the circuit breaker disconnects the short-circuit current, a strong arc will be generated between the moving contact and the static contact. The arc has a very high temperature. If it cannot be extinguished in time, it will cause great harm to the electrical appliance itself and the entire circuit. At present, the circuit breaker mainly relies on the arc extinguishing mechanism to extinguish the arc generated when the short-circuit current is disconnected. The existing arc extinguishing mechanism has poor sealing performance. The arc generated by the circuit breaker when disconnecting the short-circuit current, as well as the hot gas and molten metal particles generated by the arc, are easy to fly out of the arc extinguishing mechanism and enter other mechanisms of the circuit breaker, causing parts to burn or get stuck, making the entire circuit breaker fail. For example, moving parts such as springs, connecting rods, and trip buckles are stuck, and the mechanism cannot open and close normally.

[0003] However, due to the space limitation between the mechanisms, the arc extinguishing chamber between the middle phase of the circuit breaker and the operating mechanism cannot be completely sealed, which may easily cause particles to splash from the gap of the arc extinguishing chamber to the operating mechanism, affecting the operation of the operating mechanism. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, the present invention provides an arc isolation device which prevents metal particles from splashing onto other mechanisms and causing circuit breaker failure by arranging an arc isolation plate on an arc extinguishing chamber.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: an arc isolation device of a circuit breaker operating mechanism, including an arc extinguishing chamber, the arc extinguishing chamber including several layers of U-shaped arc extinguishing plates, each arc extinguishing plate is distributed in a row, each arc extinguishing plate is fixed on two supporting plates arranged oppositely, left and right arc extinguishing covers are respectively covered on the two side arms of the arc extinguishing plate, the uppermost arc extinguishing plate is covered with an arc isolation plate punched from insulating cardboard, a flippable baffle is cut on the arc isolation plate, and the baffle is aligned with the inner concave part of the arc extinguishing plate.

[0006] In the above technical solution, the baffle is formed by shearing and bending the middle part of the arc isolation plate. The baffle is bent at a certain angle and can swing in the up and down directions, that is, rotate along the crease at the connection. When the moving contact is pushed apart and disconnected, it can not only block the particles from splashing, but also prevent the moving contact from breaking the arc isolation plate. This structure will not hinder the rotation of the moving contact during disconnection. When the circuit breaker is disconnected and an arc is generated, the arc will splash outward under pressure. The arc isolation plate fixed by the arc extinguishing chamber and the left and right arc extinguishing covers can prevent particles from splashing into other mechanisms of the circuit breaker, thereby preventing partial failure of the movable mechanism during the circuit breaker disconnection process.

[0007] As a further configuration of the present invention, the arc isolation plate covers are arranged on the left and right arc extinguishing covers, and a clamping piece is arranged between the arc isolation plate and the left and right arc extinguishing covers.

[0008] As a further configuration of the present invention, the clamping member includes a clamping hole and a protrusion arranged on the arc isolation plate and the left and right arc extinguishing covers.

[0009] In the above technical solution, preferably, the protrusions are arranged on the left and right arc-extinguishing covers, and the clamping holes are arranged on the arc-isolating plate, so that only a hole needs to be dug when processing the arc-isolating plate, which is convenient for processing. The protrusions are arranged on the left and right arc-extinguishing covers without affecting the thickness of the arc-isolating plate, which is convenient for installation.

[0010] As a further configuration of the present invention, the arc isolation plate includes a U-shaped connecting portion and the baffle, the baffle is connected to the recessed portion of the connecting portion, and the two side arms of the connecting portion are bent and extended outward to form a 7-shape that is compatible with the left and right arc extinguishing covers, and the card hole or protrusion is arranged on the bent and extended portion of the side wall of the connecting portion.

[0011] In the above technical solution, the arc isolation plate is fitted with the left and right arc extinguishing covers, and its shape is adapted to the outer surface contour of the left and right arc extinguishing covers. The clamping hole is located in the bent and extended part, which achieves the function of upper and lower limit, avoiding the arc isolation plate from being detached from the left and right arc extinguishing covers during installation.

[0012] As a further configuration of the present invention, the protrusion and the clamping hole are square shapes that fit each other.

[0013] In the above technical solution, the square protrusions and the clamping holes are axially arranged along the upper and lower layer directions of the arc-extinguishing plate. The square clamping holes of the arc-isolating plate match the sizes of the square protrusions of the left and right arc-extinguishing covers. Both the left and right arc-extinguishing covers are provided with protrusions, so that the arc-isolating plate can be effectively fixed on the left and right arc-extinguishing covers. After the arc-isolating plate and the left and right arc-extinguishing covers are clamped, they are installed together in the base of the circuit breaker, which is conducive to positioning and fixing and is easy to process.

[0014] As a further configuration of the present invention, the arc isolation plate has a thickness of 0.3-0.5 mm.

[0015] In the above technical scheme, the preferred thickness of the arc isolation plate is 0.4 mm. If it is too thin, the structure will be unstable, easy to deform, have a short service life, and have a poor arc isolation effect. If it is too thick, it cannot be well inserted between the arc extinguishing chamber and the base because the space in the gap is limited. If it is too thick, it is not convenient to insert. The gap between the arc extinguishing chamber cover and the base is used for fixing. Particle splash protection can be performed in a limited space. The arc isolation plate is simple to form, and only a simple knife mold needs to be added.

[0016] As a further configuration of the present invention, a connecting plate is connected between the two support plates, the connecting plate is located above the uppermost arc-extinguishing plate, a notch is formed between the connecting plate and the support plate, and limiting protrusions inserted into the notch are provided on the left and right arc-extinguishing covers.

[0017] In the above technical solution, the provision of the connecting plate not only improves the structural stability of the arc extinguishing chamber, but also plays a role in isolating the arc.

[0018] The present invention will be further described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Attached Figure 1 It is a schematic diagram of the structure of a specific embodiment of the present invention;

[0020] Attached Figure 2 It is an exploded view of the structure of a specific embodiment of the present invention;

[0021] Attached Figure 3 It is a structural exploded view of an arc extinguishing chamber according to a specific embodiment of the present invention;

[0022] Attached Figure 4 It is a schematic diagram of the structure of a specific embodiment of the present invention installed on a base. DETAILED DESCRIPTION

[0023] The specific implementation example of the present invention is Figure 1-4 As shown, an arc-isolating device of a circuit breaker operating mechanism comprises an arc-extinguishing chamber 1, wherein the arc-extinguishing chamber 1 comprises a plurality of layers of U-shaped arc-extinguishing plates 11, wherein the arc-extinguishing plates 11 are arranged in a row, and wherein the arc-extinguishing plates 11 are fixed on two supporting plates 12 arranged opposite to each other, and left and right arc-extinguishing covers 13 and 14 are respectively provided on the two side arms of the arc-extinguishing plates 11, and an arc-isolating plate 2 punched from insulating paperboard is provided on the uppermost arc-extinguishing plate 11, and a flippable baffle 21 is cut on the arc-isolating plate 2, and the baffle 21 is aligned with the inner concave part of the arc-extinguishing plate 11. The baffle 21 is formed by shearing and bending the middle part of the arc isolation plate 2. The baffle 21 is bent at a certain angle and can swing in the up and down directions, that is, rotate along the fold mark at the connection. When the moving contact is pushed apart and disconnected, it can not only block the particles from splashing, but also prevent the moving contact from breaking the arc isolation plate 2. This structure will not hinder the rotation of the moving contact during disconnection. When the circuit breaker is disconnected and an arc is generated, the arc will splash outward under pressure. The arc isolation plate 2 fixed by the arc extinguishing chamber 1 and the left and right arc extinguishing covers 13 and 14 can block the particles from splashing into other mechanisms of the circuit breaker, thereby preventing partial failure of the movable mechanism during the circuit breaker disconnection process.

[0024] The arc isolation plate 2 is disposed on the left and right arc extinguishing covers 13 , 14 , and a clamping member 3 is disposed between the arc isolation plate 2 and the left and right arc extinguishing covers 13 , 14 .

[0025] The above-mentioned clamping member 3 includes a clamping hole 31 and a protrusion 32 arranged on the arc isolation plate 2 and the left and right arc extinguishing covers 13 and 14. Preferably, the protrusion 32 is arranged on the left and right arc extinguishing covers 13 and 14, and the clamping hole 31 is arranged on the arc isolation plate 2, so that the arc isolation plate 2 only needs to dig a hole during processing, which is convenient for processing. The protrusion 32 is arranged on the left and right arc extinguishing covers 13 and 14 without affecting the thickness of the arc isolation plate 2, which is convenient for installation.

[0026] The arc-isolating plate 2 comprises a U-shaped connecting portion 22 and the baffle 21, the baffle 21 is connected to the inner concave part of the connecting portion 22, the two side arms of the connecting portion 22 are bent and extended outward to form a 7-shaped shape adapted to the left and right arc-extinguishing covers 13 and 14, and the clamping hole 31 or the protrusion 32 is arranged at the bent and extended part of the side wall 221 of the connecting portion 22. The arc-isolating plate 2 is arranged to fit the left and right arc-extinguishing covers 13 and 14, and its shape is adapted to the outer surface contour of the left and right arc-extinguishing covers 13 and 14. The clamping hole 31 is located at the bent and extended part to achieve the upper and lower limit function, so as to prevent the arc-isolating plate 2 from being separated from the left and right arc-extinguishing covers 13 and 14 during installation.

[0027] The above-mentioned protrusion 32 and the clamping hole 31 are mutually adapted squares. The axial direction of the square protrusion 32 and the clamping hole 31 is arranged along the upper and lower layer direction of the arc extinguishing plate 11. The square clamping hole 31 of the arc isolation plate 2 matches the size of the square protrusion 32 of the left and right arc extinguishing covers 13 and 14. The left and right arc extinguishing covers 13 and 14 are both provided with protrusions 32, so that the arc isolation plate 2 is effectively fixed on the left and right arc extinguishing covers 13 and 14. After the arc isolation plate 2 and the left and right arc extinguishing covers 13 and 14 are clamped, they are installed together in the base of the circuit breaker, which is conducive to positioning and fixing, and is easy to process.

[0028] The thickness of the arc-isolating plate 2 is 0.3-0.5 mm. The preferred thickness of the arc-isolating plate 2 is 0.4 mm. If it is too thin, the structure will be unstable, easy to deform, short in service life, and poor in arc-isolating effect. If it is too thick, it cannot be inserted well between the arc-extinguishing chamber 1 and the base because the space in the gap is limited. If it is too thick, it is not convenient to insert. The gap between the arc-extinguishing chamber 1 cover and the base is used for fixing. The protection against particle splashing can be performed in a limited space. The arc-isolating plate 2 is simple to form, and only a simple die cutter needs to be added.

[0029] A connecting plate 15 is connected between the two support plates 12, and the connecting plate 15 is located above the uppermost arc-extinguishing plate 11. A notch 151 is formed between the connecting plate 15 and the support plate 12, and the left and right arc-extinguishing covers 13 and 14 are provided with limiting protrusions 131 and 141 inserted into the notch 151. The provision of the connecting plate 15 not only improves the structural stability of the arc-extinguishing chamber 1, but also plays the role of arc isolation.

[0030] After the arc isolation plate 2 and the arc extinguishing chamber 1 are clamped together, they are installed in the base 4 of the circuit breaker. The base is provided with two clamping grooves 41, which can effectively fix the arc extinguishing chamber 1.

[0031] The present invention is not limited to the above-mentioned specific implementation modes. A person skilled in the art may adopt other various specific implementation modes to implement the present invention based on the contents disclosed in the present invention, or any simple changes or modifications made to the design structure and concept of the present invention shall fall within the protection scope of the present invention.

Claims

1. An arc-isolating device for a circuit breaker operating mechanism, comprising an arc-extinguishing chamber, wherein the arc-extinguishing chamber comprises a plurality of layers of U-shaped arc-extinguishing plates, each arc-extinguishing plate being arranged in a row, each arc-extinguishing plate being fixed on two supporting plates arranged oppositely, and left and right arc-extinguishing covers are respectively provided on two side arms of the arc-extinguishing plate, wherein: The top arc-extinguishing plate is covered with an arc-isolating plate punched from insulating cardboard, and a flip-over baffle is cut on the arc-isolating plate. There is a gap between the corresponding end faces of the left and right arc-extinguishing covers, and the baffle is aligned with the gap between the corresponding end faces of the left and right arc-extinguishing covers.

2. The arc isolation device of the circuit breaker operating mechanism according to claim 1, characterized in that: The arc isolation plate cover is arranged on the left and right arc extinguishing covers, and a clamping piece is arranged between the arc isolation plate and the left and right arc extinguishing covers.

3. The arc isolation device of the circuit breaker operating mechanism according to claim 2, characterized in that: The clamping member comprises a clamping hole and a protrusion arranged on the arc isolation plate and the left and right arc extinguishing covers.

4. The arc isolation device of the circuit breaker operating mechanism according to claim 3, characterized in that: The arc isolation plate includes a U-shaped connecting portion and the baffle, which is connected to the concave part of the connecting portion. The two side arms of the connecting portion are bent and extended outward to form a 7-shape that is compatible with the left and right arc extinguishing covers. The card hole or protrusion is arranged on the bent and extended part of the side wall of the connecting portion.

5. The arc isolation device of the circuit breaker operating mechanism according to claim 3 or 4, characterized in that: The protrusion and the clamping hole are in the shape of long strips that fit each other.

6. The arc isolation device of the circuit breaker operating mechanism according to any one of claims 1 to 4, characterized in that: The thickness of the arc isolation plate is 0.3-0.5 mm.

7. The arc isolation device of the circuit breaker operating mechanism according to any one of claims 1 to 4, characterized in that: A connecting plate is connected between the two support plates, and the connecting plate is located above the uppermost arc-extinguishing plate. A gap is formed between the connecting plate and the support plate, and the left and right arc-extinguishing covers are provided with limiting protrusions inserted into the gap.

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