Double-contact static contact and molded case circuit breaker

Abstract

The double-contact static contact comprises a static contact body and an arc striking assembly, the static contact body comprises a power connection part and a connection part, an included angle is formed between the power connection part and the connection part, one end of the power connection part is provided with a connection hole, and the middle part of one end of the connection part is provided with a separation gap. The two sides of the separation gap form shunting ends respectively, the shunting ends extend outwards to form bent parts, the ends, away from the shunting ends, of the bent parts extend outwards to form bearing parts, the bearing parts are provided with static contacts respectively, the bent parts and the bearing parts on the two sides are symmetrically arranged on the side faces of the separation gap, and the arc striking assembly is arranged on the power connection part. An arc striking part is arranged at the end, away from the power connection part, of the arc striking assembly and is close to the bearing part. According to the double-contact static contact, on the basis of ensuring that the size of the static contact is not enlarged, current shunting on the static contact body can be realized, and an arc striking function during breaking can also be realized.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, in particular to a double-contact static contact and a molded case circuit breaker. Background Art

[0002] Molded case circuit breakers mainly include contact systems and arc extinguishing systems. The static contact is the main component in the contact system. It realizes the overall opening and closing of the circuit breaker by disconnecting with the moving contact. Therefore, the working quality of the static contact directly affects the overall working performance of the circuit breaker.

[0003] The middle part of the static contact on the existing molded case circuit breaker is usually provided with a shunt hole to divide the large current into a small current, so that the overall temperature rise effect of the static contact is significantly reduced. In order to improve the arc extinguishing performance of the arc generated by the moving and static contacts, an arc-starting plate is provided on the static contact to lead the arc to the arc-extinguishing chamber for arc extinguishing. However, there is a conflict between the positions of the shunt hole and the arc-starting plate. In order to coexist with the two, the industry often achieves this by lengthening the size of the static contact, which undoubtedly increases the cost of the static contact and the length of the molded case circuit breaker. Utility Model Content

[0004] In order to solve the above problems, the technical solution provided by the utility model is:

[0005] A double-contact static contact comprises a static contact body and an arc-striking assembly, wherein the static contact body comprises an electrical connection portion and a connecting portion, an angle being formed between the electrical connection portion and the connecting portion, a connecting hole being provided on one end of the electrical connection portion, a separation gap being provided in the middle of one end of the connecting portion, shunt ends being formed on both sides of the separation gap, both shunt ends extending outward to form a bending portion, an end of the bending portion away from the shunt end extending outward to form a bearing portion, static contacts being provided on the bearing portion, the bending portions and the bearing portions on both sides being symmetrically arranged on the sides of the separation gap, the arc-striking assembly being arranged on the electrical connection portion, an arc-striking portion being provided on the end of the arc-striking assembly away from the electrical connection portion, and the arc-striking portion being arranged close to the bearing portion.

[0006] The utility model is further configured such that the arc striking assembly includes a supporting portion, a positioning end is provided at one end of the supporting portion close to the power connection portion, a positioning groove is provided on the power connection portion, the positioning end is connected in the positioning groove, and the arc striking portion is connected to one end of the supporting portion away from the power connection portion.

[0007] The utility model is further configured such that a side of the arc-striking portion close to the static contact is a curved arc surface, the lowest point of the arc-striking portion is lower than the static contact, and the highest point of the arc-striking portion is higher than the static contact.

[0008] The utility model is further arranged that the minimum distance from the static contact to the arc surface of the arc striking portion is 1.5 mm to 3.5 mm.

[0009] The utility model is further configured such that the bearing portion and the power connection portion are parallel to each other.

[0010] The utility model is further configured such that the width of the arc striking portion is not less than the distance between the two static contacts, and the width of the arc striking portion is not greater than the width of the power connection portion.

[0011] The utility model is further configured such that the static contact body and the arc striking assembly are integrally formed.

[0012] The utility model is further configured that the static contact body and the arc striking assembly are welded into one body by gas welding.

[0013] The utility model is further configured such that the spacing of the separation gap is 3.0 mm to 5.0 mm.

[0014] A molded case circuit breaker adopts the above-mentioned double-contact static contact.

[0015] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects:

[0016] The double-contact static contact of the technical solution is provided with two bearing parts at the end, and the bearing parts are provided with static contacts. The separation gaps between the bearing parts and the curved parts on both sides serve as shunt holes to convert the large current passing through the static contact into a small current. The arc-starting assembly is arranged on the power connection part, and the arc-starting part is arranged close to the bearing part. When the moving and static contacts are separated, the arc-starting part can lead the arc to the arc-extinguishing chamber for arc extinguishing. The double-contact static contact of the utility model can realize the current shunting on the static contact body and the arc-starting function during disconnection without enlarging the size of the static contact. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a stereoscopic diagram of a double-contact static contact according to an embodiment of the utility model.

[0018] Figure 2 This is an exploded view of the double-contact static contact of an embodiment of the utility model.

[0019] Figure 3 This is a cross-sectional view of a double-contact static contact according to an embodiment of the utility model. DETAILED DESCRIPTION

[0020] In order to further understand the content of the utility model, the utility model is described in detail in conjunction with the accompanying drawings and embodiments.

[0021] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0022] In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, an integral connection, or a detachable connection; it can be a mechanical connection or an electrical connection, or it can be the internal connection of two components; it can be a direct connection, or it can be indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0023] Example 1

[0024] Combined with Figure 1 To Attachment Figure 3 The technical scheme of the utility model is a double-contact static contact, including a static contact body 100 and an arc-striking assembly 200, wherein the static contact body 100 includes a power connection part 110 and a connecting part 120, wherein an angle is formed between the power connection part 110 and the connecting part 120, wherein a connecting hole 111 is provided at one end of the power connection part 110, and a separation gap 130 is provided at the middle of one end of the connecting part 120, wherein shunt ends 121 are respectively formed on both sides of the separation gap 130, and the shunt ends 121 are both extended outward to form a A bending portion 140 is formed, and one end of the bending portion 140 away from the shunt end 121 extends outward to form a bearing portion 150, and static contacts 160 are respectively provided on the bearing portions 150. The bending portions 140 and the bearing portions 150 on both sides are symmetrically arranged on the sides of the separation gap 130, and the arc-striking assembly 200 is arranged on the power connection portion 110. An arc-striking portion 210 is provided at one end of the arc-striking assembly 200 away from the power connection portion, and the arc-striking portion 210 is arranged close to the bearing portion 150.

[0025] In this embodiment, the double-contact static contact is provided with two bearing parts 150 at the end, and static contacts 160 are provided on the bearing parts 150. The separation gaps 130 between the bearing parts 150 and the bending parts 140 on both sides serve as shunt holes to convert the large current passing through the static contact into a small current. The arc striking assembly 200 is arranged on the power connection part 110, and the arc striking part 210 is arranged close to the bearing part 150. When the moving and static contacts are separated, the arc striking part 210 can lead the arc to the arc extinguishing chamber for arc extinguishing.

[0026] In this embodiment, the arc striking assembly 200 also includes a supporting portion 220, and a positioning end 221 is provided at one end of the supporting portion 220 close to the power connection portion 110. A positioning groove 112 is provided on the power connection portion 110, and the positioning end 221 is connected to the positioning groove 112. The arc striking portion 210 is connected to one end of the supporting portion 220 away from the power connection portion 110.

[0027] In this embodiment, the arc-striking portion 210 has a curved arc surface on one side close to the static contact 160, the lowest point of the arc-striking portion 210 is lower than the static contact 160, and the highest point of the arc-striking portion 210 is higher than the static contact 160; this can ensure that the arc-striking portion 210 provides an effective arc-striking effect on the arc generated when the moving and static contacts are separated.

[0028] In this embodiment, the minimum distance D1 from the static contact 160 to the arc surface of the arc striking portion 210 is 1.5 mm to 3.5 mm.

[0029] In this embodiment, the carrying portion 150 and the power connection portion 110 are parallel to each other. Due to the angle between the power connection portion 110 and the connecting portion 120 and the bent portion 140 , the carrying portion 150 and the power connection portion 110 are parallel to each other.

[0030] In this embodiment, the width of the arc-striking portion 210 is not less than the distance between the two static contacts 160, and the width of the arc-striking portion 210 is not greater than the width of the power connection portion 110; the above dimensions can ensure the arc-striking effect, and at the same time do not affect the assembly of the static contact inside the molded case circuit breaker.

[0031] In this embodiment, the static contact body 100 and the arc striking assembly 200 are both integrally formed.

[0032] In this embodiment, the static contact body 100 and the arc striking assembly 200 are welded together by gas welding. The welding of copper and copper alloys may produce some defects, such as incomplete welding, poor fusion, deformation, cracks and pores in the weld and fusion zone, etc. In order to avoid these problems, gas welding is used for welding.

[0033] In this embodiment, the spacing of the separation gaps 130 is 3.0 mm to 5.0 mm.

[0034] The double-contact static contact of the utility model can realize current shunting on the static contact body and arc striking function during breaking without increasing the size of the static contact, so as to develop the molded case circuit breaker in the direction of miniaturization.

[0035] Example 2

[0036] The technical solution of the utility model is a molded case circuit breaker, which adopts the double-contact static contact described in Example 1.

[0037] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A double-contact static contact, characterized in that: The utility model comprises a stationary contact body and an arc-striking assembly, wherein the stationary contact body comprises an electrical connection part and a connecting part, an angle is formed between the electrical connection part and the connecting part, a connecting hole is provided on one end of the electrical connection part, a separation gap is provided in the middle of one end of the connecting part, shunt ends are respectively formed on both sides of the separation gap, the shunt ends are both extended outward to form a bending part, an end of the bending part away from the shunt end is extended outward to form a bearing part, stationary contacts are respectively provided on the bearing part, the bending parts and the bearing parts on both sides are symmetrically arranged on the sides of the separation gap, the arc-striking assembly is arranged on the electrical connection part, an arc-striking part is provided on the end of the arc-striking assembly away from the electrical connection part, and the arc-striking part is arranged close to the bearing part.

2. A double-contact static contact according to claim 1, characterized in that: The arc striking assembly comprises a supporting part, a positioning end is provided at one end of the supporting part close to the power connection part, a positioning groove is provided on the power connection part, the positioning end is connected in the positioning groove, and the arc striking part is connected to one end of the supporting part away from the power connection part.

3. A double-contact static contact according to claim 2, characterized in that: A side of the arc-striking portion close to the static contact is in a curved arc surface, the lowest point of the arc-striking portion is lower than the static contact, and the highest point of the arc-striking portion is higher than the static contact.

4. A double-contact static contact according to claim 3, characterized in that: The minimum distance from the static contact to the arc surface of the arc striking portion is 1.5 mm to 3.5 mm.

5. A double-contact static contact according to any one of claims 1 to 4, characterized in that: The carrying portion and the power connection portion are parallel to each other.

6. A double-contact stationary contact according to any one of claims 1 to 4, characterized in that: The width of the arc-striking portion is not less than the distance between the two static contacts, and the width of the arc-striking portion is not greater than the width of the power connection portion.

7. A double-contact stationary contact according to any one of claims 1 to 4, characterized in that: The stationary contact body and the arc striking assembly are both integrally formed.

8. A double-contact stationary contact according to claim 7, characterized in that: The stationary contact body and the arc striking assembly are welded into one body by gas welding.

9. A double-contact stationary contact according to any one of claims 1 to 4, characterized in that: The spacing of the separation gap is 3.0 mm to 5.0 mm.

10. A molded case circuit breaker, characterized in that: A double-contact stationary contact as described in any one of claims 1 to 9 is adopted.

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