Static contact and molded case circuit breaker

Abstract

The static contact comprises a static contact body, the static contact body sequentially comprises a power connection portion, a bending portion and a bearing portion, the power connection portion is parallel to the bearing portion, the power connection portion is arranged at the bottom of the static contact body, the bearing portion is arranged at the top of the static contact body, and a static contact is arranged on one side, far away from the power connection portion, of the bearing portion. Positioning protrusions are arranged on the two sides of the end, close to the bent portion, of the power connection portion respectively, positioning cavities are formed in the bottoms of the positioning protrusions, a connecting hole is formed in the end, away from the bent portion, of the power connection portion, and a fixing hole is formed between the connecting hole and the positioning protrusions. According to the utility model, the fixed contact and the molded case circuit breaker base can be fixed by only adopting one fastener, so that the local heat productivity of the fixed contact is reduced, the service life of the fixed contact is effectively prolonged, the processing procedures and the assembling procedures of the fixed contact are reduced, and the production cost is reduced; and the overall structure of the static contact body enables the installation height of the static contact to be effectively reduced, so that the molded case circuit breaker is more miniaturized.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical equipment, in particular to a 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] In order to ensure the stability of the linkage between the static contact and the moving contact when the existing static contact is assembled into the housing, it is fixed by fasteners such as small bolts to ensure that the static contact does not deviate or shake during the use of the molded case circuit breaker. However, this fixing method requires at least two fixing holes to be opened on the static contact, such as a static contact of a molded case circuit breaker disclosed in a Chinese patent with publication number CN206163443U. This not only increases the processing and assembly procedures of the static contact, but also increases the overall installation height of the static contact, resulting in the inability to miniaturize the size of the molded case circuit breaker. In addition, the connection is prone to temperature rise, resulting in excessive local temperature of the static contact, which affects the practical life of the static contact. Utility Model Content

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

[0005] A static contact comprises a static contact body, wherein the static contact body comprises an electrical connection portion, a bending portion and a bearing portion in sequence, wherein the electrical connection portion is parallel to the bearing portion, the electrical connection portion is located at the bottom of the static contact body, and the bearing portion is located at the top of the static contact body, a static contact point is provided on the side of the bearing portion away from the electrical connection portion, positioning protrusions are respectively provided on both sides of the electrical connection portion close to one end of the bending portion, a positioning cavity is formed at the bottom of the positioning protrusion, a connecting hole is provided at one end of the electrical connection portion away from the bending portion, and a fixing hole is provided between the connecting hole and the positioning protrusion.

[0006] The utility model is further configured that a shunt hole is also provided on the power connection portion, and the shunt hole is located between the fixing hole and the positioning protrusion.

[0007] The utility model is further configured that the outer surface of the curved portion is an arc surface.

[0008] The utility model is further configured such that the positioning protrusion is located directly below the bearing portion.

[0009] The utility model is further configured such that the positioning protrusions on both sides are symmetrically arranged on both sides of the power connection part.

[0010] The utility model is further configured such that the spacing between the positioning protrusion and the bearing portion is 10 mm to 15 mm.

[0011] The utility model is further configured such that the fixing hole is located on the central axis of the power connection part.

[0012] The utility model is further configured such that the width of the power connection portion, the width of the bending portion and the width of the bearing portion are all consistent.

[0013] A molded case circuit breaker comprises the above-mentioned static contact.

[0014] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects:

[0015] The static contact of the technical solution is provided with positioning protrusions on both sides of the power connection part, and the positioning cavity of the positioning protrusion is used to clamp and position with the base of the molded case circuit breaker, and then a fastener is passed through the fixing hole to realize the stable assembly of the static contact and the base of the molded case circuit breaker.

[0016] The utility model adopts only one fastener to fix the static contact to the base of the molded case circuit breaker, reduces the local heat generation of the static contact, effectively improves the service life of the static contact, and reduces the processing and assembly processes of the static contact, thereby reducing the production cost; secondly, the overall structure of the static contact body effectively reduces the installation height of the static contact, making the molded case circuit breaker more miniaturized. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a stereoscopic diagram of the static contact of Example 1 of the utility model.

[0018] Figure 2 This is a cross-sectional view of the static contact of Example 1 of the utility model.

[0019] Figure 3 This is a stereoscopic diagram of a molded case circuit breaker according to Embodiment 2 of the present 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 2 The technical solution of the utility model is a static contact, including a static contact body 100, the static contact body 100 is integrally formed, the static contact body 100 sequentially includes a power connection part 110, a bending part 120 and a bearing part 130, the power connection part 110 is parallel to the bearing part 130, when the static contact body 100 is installed in a molded case circuit breaker, the power connection part 110 is located at the bottom of the static contact body 100, the bearing part 130 is located at the bottom of the static contact body 100, and the bearing part 130 is located at the bottom of the static contact body 100. At the top of the contact body 100, a static contact 140 is provided on the side of the bearing portion 130 away from the power connection portion 110, and positioning protrusions 150 are respectively provided on both sides of the power connection portion 110 close to the end of the bending portion 120, and a positioning cavity 151 is formed at the bottom of the positioning protrusion 150. A connecting hole 160 is provided at the end of the power connection portion 110 away from the bending portion 120, and a fixing hole 170 is provided between the connecting hole 160 and the positioning protrusion 150.

[0025] In this embodiment, the static contact body 100 is provided with positioning protrusions 150 on both sides of the power connection part 110, and the positioning cavity 151 of the positioning protrusion 150 is used to clamp and position with the base of the molded case circuit breaker, and then a fastener is passed through the fixing hole 170 to realize the rapid and stable assembly of the static contact body 100 and the base of the molded case circuit breaker. The utility model static contact only uses one fastener to realize the fixation of the static contact body 100 and the base of the molded case circuit breaker, reduces the local heat generation of the static contact, effectively improves the service life of the static contact, and reduces the processing and assembly processes of the static contact, thereby reducing the production cost; secondly, the overall structure of the static contact body effectively reduces the installation height of the static contact, making the molded case circuit breaker more miniaturized.

[0026] In this embodiment, a shunt hole 180 is further formed on the power connection portion 110 , and the shunt hole 180 is located between the fixing hole 170 and the positioning protrusion 150 .

[0027] In this embodiment, the outer surface of the bent portion 120 is an arc surface, and the bent portion 120 serves as the connecting portion between the power connection portion 110 and the bearing portion 130, so that the static contact body 100 is U-shaped as a whole. When the static contact is separated from the moving contact, a Lorentz force is generated on the breaking arc, causing the arc to quickly enter the arc extinguishing chamber for arc extinguishing.

[0028] In this embodiment, the positioning protrusion 150 is located directly below the carrying portion 130 .

[0029] In this embodiment, the positioning protrusions 150 on both sides are symmetrically arranged on both sides of the power connection part 110. The arrangement of the positioning protrusions 150 actually increases the cross-sectional area of ​​the plane where they are located (relative to other cross-sections of the power connection part 110), thereby ensuring that the arrangement of the positioning protrusions 150 does not affect the current-carrying capacity of the static contact body 100.

[0030] In this embodiment, a distance D1 between the positioning protrusion 150 and the bearing portion 130 is 10 mm to 15 mm.

[0031] In this embodiment, the fixing hole 170 is located on the central axis of the power connection portion 110 .

[0032] In this embodiment, the width of the power connection portion 110 , the width of the bending portion 120 and the width of the bearing portion 130 are all consistent, which facilitates the assembly of the static contact body 100 on the molded case circuit breaker base.

[0033] Example 2

[0034] Combined with Figure 3 The technical solution of the utility model is a molded case circuit breaker 200, including the static contact body 100 described in Example 1, the static contact body 100 is fixed to the base of the molded case circuit breaker 200 by fasteners passing through the fixing hole 170, and the static contact body 100 is electrically connected to the external conductor by bolts passing through the connecting hole 160.

[0035] The molded case circuit breaker 200 of the technical solution of the utility model adopts the static contact body 100, so that the molded case circuit breaker is more miniaturized.

[0036] 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 stationary contact, characterized in that: The static contact body comprises a static contact body, which comprises an electrical connection part, a bending part and a bearing part in sequence, wherein the electrical connection part is parallel to the bearing part, the electrical connection part is located at the bottom of the static contact body, and the bearing part is located at the top of the static contact body, a static contact point is arranged on the side of the bearing part away from the electrical connection part, positioning protrusions are arranged on both sides of the electrical connection part close to one end of the bending part, a positioning cavity is formed at the bottom of the positioning protrusion, a connecting hole is arranged at one end of the electrical connection part away from the bending part, and a fixing hole is arranged between the connecting hole and the positioning protrusion.

2. A stationary contact according to claim 1, characterized in that: The power connection portion is also provided with a shunt hole, and the shunt hole is located between the fixing hole and the positioning protrusion.

3. A stationary contact according to claim 1, characterized in that: The outer surface of the curved portion is an arc surface.

4. A stationary contact according to claim 1, characterized in that: The positioning protrusion is located directly below the bearing portion.

5. A stationary contact according to claim 4, characterized in that: The positioning protrusions on both sides are symmetrically arranged on both sides of the power connection part.

6. A stationary contact according to claim 4, characterized in that: The distance between the positioning protrusion and the bearing portion is 10 mm to 15 mm.

7. A stationary contact according to any one of claims 1 to 6, characterized in that: The fixing hole is located on the central axis of the power connection part.

8. A stationary contact according to any one of claims 1 to 6, characterized in that: The width of the power connection portion, the width of the bending portion and the width of the bearing portion are all consistent.

9. A molded case circuit breaker, characterized in that: A stationary contact comprising the stationary contact as claimed in any one of claims 1 to 8.

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