CN215988641U - Static contact cover, static contact assembly and plastic shell type circuit breaker - Google Patents
Static contact cover, static contact assembly and plastic shell type circuit breaker Download PDFInfo
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- CN215988641U CN215988641U CN202122634982.8U CN202122634982U CN215988641U CN 215988641 U CN215988641 U CN 215988641U CN 202122634982 U CN202122634982 U CN 202122634982U CN 215988641 U CN215988641 U CN 215988641U
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Abstract
The utility model discloses a static contact cover, a static contact assembly and a plastic shell type circuit breaker, wherein the static contact cover is fixed on a static contact assembly (11), the static contact cover (12) is of an annular structure and at least can cover the periphery of a static contact boss (11a) in the static contact assembly (11), a top wall notch of the static contact cover is matched with the static contact boss (11a) so as to facilitate the connection of a static contact and a static contact, and the static contact cover (12) is made of an insulating material. The utility model also provides a static contact assembly and a plastic shell type circuit breaker. The utility model can increase the creepage distance between the moving contact and the static contact, protect the static contact from the erosion of electric arc in a large area, improve the breaking capacity and prolong the service life.
Description
Technical Field
The utility model relates to the technical field of low-voltage circuit breakers, in particular to a static contact cover, a static contact assembly and a plastic shell type circuit breaker.
Background
When the existing plastic shell type circuit breaker is used for breaking experiments, the existing plastic shell type circuit breaker is easy to be eroded by electric arcs, so that the arcs between moving and static contacts are not easy to break, breaking failure, burning of moving and static silver points and the like are caused.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a static contact cover which can protect a static contact from being corroded by electric arcs in a large area, improve breaking capacity and prolong the service life of the contact. Another object of the present invention is to provide a static contact assembly, which can protect the static contact from the erosion of the arc in a large area, improve the breaking capacity, and prolong the service life of the contact. Another object of the present invention is to provide a plastic shell type circuit breaker, which can protect the static contact from the erosion of the arc in a large area, improve the breaking capacity, and prolong the service life.
In order to solve the above technical problems, the present invention provides a stationary contact cover fixed to a stationary contact component, wherein the stationary contact cover is of an annular structure and at least covers the periphery of a stationary contact boss in the stationary contact component, a top wall notch of the stationary contact cover is matched with the stationary contact boss so as to facilitate the engagement of a stationary contact and a stationary contact, and the stationary contact cover is made of an insulating material.
The static contact cover can cover the whole area of the boss of the static contact except the joint part, effectively increases the creepage distance between the static contact and the static contact, protects the static contact from the erosion of electric arc in a large area, increases the insulation distance when the static contact is disconnected, thereby improving the breaking capacity and prolonging the service life of the static contact and the static contact.
Optionally, the lower opening end of the stationary contact cover is provided with a folded edge folded inwards for being clamped and fixed with the bottom wall of the stationary contact boss.
Optionally, an L-shaped bent portion is disposed at the other side of the lower opening end of the static contact cover opposite to the folded edge to cover the free end of the static contact boss mounting seat.
Optionally, two sides of the stationary contact cover are respectively provided with a protrusion for being inserted and matched with a notch of the arc extinguish chamber.
Optionally, the lower opening end of the stationary contact cover is further provided with an extending portion extending outwards for being attached to the top wall of the stationary contact boss mounting seat.
Optionally, the static contact cover is made of PA66 or POM.
The utility model also provides a static contact component, which comprises a static contact part and the static contact cover, wherein in the installation state, the turning edge is positioned at one side close to the first connecting plate of the static contact part, and the bending part is positioned at one side far away from the first connecting plate.
The static contact assembly of the utility model comprises the static contact cover, so the static contact assembly has the same technical effects as the static contact cover, and the description is omitted.
The utility model also provides a plastic shell type circuit breaker which comprises a static contact, a moving contact, an arc extinguish chamber and a base, wherein the static contact is the static contact component, the static contact component and the moving contact are both arranged in the arc extinguish chamber, and a static contact boss of the static contact component is exposed in the arc extinguish chamber only through a gap on the top wall of the static contact boss.
The molded case circuit breaker of the utility model comprises the static contact assembly, so the same technical effect as the static contact assembly is achieved, and the details are not repeated.
Optionally, the base includes a second connection plate extending in a vertical direction, a groove is formed between the end wall of the free end of the static contact boss mounting seat and the second connection plate, and the vertical section of the bent portion is inserted into the groove.
Optionally, the vertical section extends to abut against a bottom wall of the groove.
Drawings
Fig. 1 is a schematic structural diagram of a static contact assembly according to an embodiment of the present invention;
FIG. 2 is a schematic view of the fixed contact assembly of FIG. 1 taken along its length;
FIG. 3 is a schematic diagram of a stationary contact component of the stationary contact component of FIG. 1;
FIG. 4 is a schematic view of the stationary contact shell of the stationary contact assembly of FIG. 1;
fig. 5 is a schematic structural diagram of a molded case circuit breaker according to an embodiment of the present invention in a closed state of moving and stationary contacts;
fig. 6 is a schematic structural diagram of a molded case circuit breaker according to an embodiment of the present invention in a state where moving and stationary contacts are separated;
fig. 7 is a partial structural schematic diagram of a molded case circuit breaker;
wherein the reference numerals in fig. 1-7 are explained as follows:
1-a stationary contact assembly; 11-a stationary contact part; 11 a-a static contact boss; 11 b-a first coupling plate; 11 c-a static contact boss mounting seat; 11 d-static contact silver points; 12-stationary contact covers; 12 a-flanging; 12 b-a bending part; 12 c-bumps; 12 d-an extension;
2-an arc extinguishing chamber; 2 a-notches;
3-moving contact;
4-a base; 41-second connection plate.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 to 5, fig. 1 is a schematic structural diagram of a static contact component according to an embodiment of the present invention; FIG. 2 is a schematic view of the fixed contact assembly of FIG. 1 taken along its length; FIG. 3 is a schematic diagram of a stationary contact component of the stationary contact component of FIG. 1; FIG. 4 is a schematic view of the stationary contact shell of the stationary contact assembly of FIG. 1; fig. 5 is a schematic structural diagram of a plastic shell type circuit breaker according to a specific embodiment of the present invention, in a state where a moving contact and a stationary contact are closed.
The utility model provides a static contact cover 12, the static contact cover 12 is fixed on a static contact component 11, the specific structure of the static contact component 11 is shown in fig. 3, and comprises a static contact boss 11a, an L-shaped first coupling plate 11b, and an annular static contact boss mounting seat 11c, in practical application, the three are an integral structure, and the separate description is only for better describing the functions of the three, wherein, the first coupling plate 11b is fixedly connected with one end of the static contact boss mounting seat 11c in the length direction, the static contact boss 11a is arranged in the annular region of the static contact boss mounting seat 11c, one end of the static contact cover 12 far away from the first coupling plate 11b is fixedly connected with the static contact boss mounting seat 11c and extends along the length direction of the static contact boss mounting seat 11c, the other end forms a free end, a static contact silver point 11d is arranged on the static contact boss 11a, for engaging or disengaging with the movable contacts 3.
As shown in fig. 1 and 4, the stationary contact cover 12 of the present invention is of an annular structure and covers the periphery of the stationary contact boss 11a, and a gap matched with the stationary contact boss 11a is formed in the top wall of the stationary contact cover at the corresponding position of the stationary contact boss 11a, so that the stationary contacts and the stationary contacts can be connected or disconnected with each other, and the stationary contact cover 12 is made of an insulating material.
Therefore, the static contact cover 12 of the utility model covers the whole area of the boss 11a of the static contact except the joint part, effectively increases the creepage distance between the static contact and the static contact, protects the static contact from the erosion of electric arc in a large area, increases the insulation distance when the static contact and the dynamic contact are disconnected, thereby improving the breaking capacity and prolonging the service life of the static contact and the dynamic contact.
The stationary contact cover 12 may be made of PA66 or POM, wherein PA66(Polyamide 66), i.e. nylon 66, and POM (polyoxymethylene), i.e. polyoxymethylene, which have excellent insulating property and thermal aging resistance, and can generate gas at high temperature to blow the arc into the arc-extinguishing chamber 2, so as to improve the breaking performance of the circuit breaker.
In this embodiment, the static contact cover 12 is fixed to the static contact boss 11a in a clamping manner, as shown in fig. 2, an inward folded edge 12a is provided at a side of the lower opening end of the static contact cover 12 close to the first coupling plate 11b, and abuts against the bottom wall of the static contact boss 11a, so that the clamping fixation is achieved.
It can be understood that, besides the above embodiments, a snap structure may also be disposed at the lower opening ends of the two side walls of the static contact cover 12 in the width direction to abut against the bottom wall of the static contact boss 11a, so as to implement clamping fixation. Of course, the embodiment of the present embodiment has a simpler structure and is more convenient to assemble, which is a more preferable embodiment.
In practical application, the static contact cover 12 and the static contact boss 11a may be fixed by means of bonding, besides being fixed by clamping, and the like, which is not limited herein.
Meanwhile, an extension portion 12d extending outwards is further arranged at one side, close to the first connecting plate 11b, of the lower opening end of the static contact cover 12 and is used for being attached to the top wall of the static contact boss mounting seat 11c, so that the contact area between the static contact cover 12 and the static contact boss mounting seat 11c is enlarged, and the protection effect of the static contact boss 11a is improved.
Referring to fig. 1-2 and 5-6, fig. 6 is a schematic structural diagram of a molded case circuit breaker according to an embodiment of the present invention in a state where moving and stationary contacts are separated.
In this embodiment, an L-shaped bending portion 12b is further disposed on a side of the static contact cover 12 away from the first coupling plate 11b, and is used for covering the free end of the static contact boss mounting seat 11c, so that the protection area can be further enlarged, the creepage distance between the moving contact and the static contact can be increased, and even when a vertical section of the bending portion 12b extends to abut against a horizontal extending portion of the base 4, the generation of electric arcs can be reduced, thereby improving the breaking capacity and prolonging the service life of the moving contact and the static contact.
With continued reference to fig. 1 and fig. 4, two sides of the stationary contact housing 12 are respectively provided with a protrusion 12c for being inserted into and engaged with the notch 2a of the arc extinguish chamber 2.
The utility model also provides a static contact assembly 1, which comprises a static contact component 11 and the static contact cover 12, wherein in the installation state, the turning edge 12a is positioned at one side close to the first connecting plate 11b of the static contact component 11, and the bending part 12b is positioned at one side far away from the first connecting plate 11 b.
The static contact component 1 comprises the static contact cover 12, the static contact cover 12 covers the whole area of the boss 11a of the static contact except the joint part, the creepage distance between the static contact and the static contact is effectively increased, the static contact is protected from being corroded by electric arc in a large area, the insulation distance is increased when the static contact and the static contact are disconnected, the breaking capacity is improved, and the service life of the static contact and the static contact is prolonged.
Referring to fig. 7, fig. 7 is a schematic partial structure diagram of the molded case circuit breaker.
The utility model also provides a plastic shell type circuit breaker, which comprises a static contact, a movable contact 3, an arc extinguish chamber 2 and a base 4, wherein the static contact is the static contact component 1, the static contact component 1 and the movable contact 3 are both arranged in the arc extinguish chamber 2, and a static contact boss 11a of the static contact component 1 is exposed in the arc extinguish chamber 2 only through a gap on the top wall of the static contact boss.
The plastic shell type circuit breaker comprises the static contact assembly 1, the static contact assembly 1 covers the whole area of the boss 11a of the static contact except the joint part by arranging the insulated static contact cover 12, the creepage distance between the static contact and the static contact is effectively increased, the static contact is protected from being eroded by electric arc in a large area, the insulation distance is increased when the static contact and the static contact are separated and disconnected, the breaking capacity is improved, and the service life of the static contact and the static contact is prolonged.
As shown in fig. 5 and 6, the base 4 further includes two vertical extending portions, which enclose to form an accommodating cavity, the arc extinguish chamber 2 is located in the accommodating cavity, wherein the vertical extending portion near the free end of the static contact boss mounting seat 11c is defined as a second connecting plate 41, a groove is formed between the end wall of the free end of the static contact boss mounting seat 11c and the second connecting plate 41, and the vertical section of the bending portion 12b is inserted into the groove.
As mentioned above, the vertical section can extend to the middle part of the groove and can also extend to abut against the bottom wall of the groove, when the vertical section extends to the middle part of the groove, electric arcs still exist between the moving contact and the static contact, but the creepage distance between the moving contact and the static contact is effectively increased, and the breaking capacity is improved; when the vertical section of the bending part 12b is arranged to abut against the bottom wall of the groove, the generation of electric arc can be reduced, and the breaking capacity can be improved to the maximum.
The above detailed descriptions of the stationary contact cover, the stationary contact assembly and the molded case circuit breaker provided by the present invention are provided, and the principle and the implementation of the present invention are explained in the present document by using specific examples, and the above descriptions of the embodiments are only used to help understanding the method of the present invention and the core idea thereof. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. A static contact cover is fixed on a static contact component (11), and is characterized in that the static contact cover (12) is of an annular structure and at least can cover the periphery of a static contact boss (11a) in the static contact component (11), a top wall notch of the static contact cover is matched with the static contact boss (11a) so as to be convenient for the connection of a static contact and a static contact, and the static contact cover (12) is made of an insulating material.
2. The stationary contact cover according to claim 1, wherein the lower opening end of the stationary contact cover (12) is provided with an inward folded edge (12a) for being clamped and fixed with the bottom wall of the stationary contact boss (11 a).
3. The stationary contact cover according to claim 2, wherein the lower opening end of the stationary contact cover (12) is provided with an L-shaped bent portion (12b) at the other side opposite to the folded edge (12a) to cover the free end of the stationary contact boss mounting seat (11 c).
4. The stationary contact cover according to claim 3, characterized in that the stationary contact cover (12) is provided with a protrusion (12c) on each side for a plug-in engagement with the notch (2a) of the arc extinguishing chamber (2).
5. The stationary contact cover according to claim 3, wherein the lower opening end of the stationary contact cover (12) is further provided with an extension portion (12d) extending outwards for abutting against the top wall of the stationary contact boss mounting seat (11 c).
6. The stationary contact shell according to claim 3, characterized in that the material of the stationary contact shell (12) is PA66 or POM.
7. Stationary contact assembly, comprising a stationary contact part (11) and a stationary contact cover (12) according to any of claims 3-6, wherein in a mounted state the folded edge (12a) is located on a side of the first connecting plate (11b) which is close to the stationary contact part (11), and wherein the folded edge (12b) is located on a side which is remote from the first connecting plate (11 b).
8. A mould shell type circuit breaker, includes static contact, moving contact (3), explosion chamber (2) and base (4), characterized by, the static contact is claim 7 static contact subassembly (1), static contact subassembly (1) with moving contact (3) all set up in explosion chamber (2), just static contact boss (11a) of static contact subassembly (1) only exposes through its roof breach in explosion chamber (2).
9. The molded case circuit breaker of claim 8, wherein the base (4) comprises a second connecting plate (41) extending in a vertical direction, a groove is formed between the free end wall of the static contact boss mounting seat (11c) and the second connecting plate (41), and the vertical section of the bent portion (12b) is inserted into the groove.
10. A molded case circuit breaker as defined in claim 9, wherein said vertical segment extends to abut against a bottom wall of said recess.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122634982.8U CN215988641U (en) | 2021-10-29 | 2021-10-29 | Static contact cover, static contact assembly and plastic shell type circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122634982.8U CN215988641U (en) | 2021-10-29 | 2021-10-29 | Static contact cover, static contact assembly and plastic shell type circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215988641U true CN215988641U (en) | 2022-03-08 |
Family
ID=80511416
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122634982.8U Active CN215988641U (en) | 2021-10-29 | 2021-10-29 | Static contact cover, static contact assembly and plastic shell type circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215988641U (en) |
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2021
- 2021-10-29 CN CN202122634982.8U patent/CN215988641U/en active Active
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