Static contact assembly and molded case circuit breaker

Abstract

The utility model relates to the field of low-voltage electrical technology of an electric power system, in particular to a static contact assembly and a molded case circuit breaker, a static contact body is composed of an inverted Z-shaped connecting part and an inverted U-shaped contact part, a static contact is arranged on the top end face of the contact part, an arc striking sheet is connected to the lower surface of the static contact body, and the arc striking sheet is connected to the lower surface of the static contact body. The arc striking piece is located at the front end of the static contact and used for pointing to arc striking of an arc extinguish chamber, and the magnetic increasing pieces are connected to the contact part and located on the two sides of the upper portion of the static contact, so that magnetic field distribution is facilitated, the electric repulsive force of a moving contact conducting rod can be greatly increased, the molded case circuit breaker can act faster and more reliably when overload or short circuit or other abnormal conditions happen, and the service life of the molded case circuit breaker is prolonged. Therefore, a better protection effect is provided, the breaking capacity of the molded case circuit breaker is improved, the magnetic increasing sheet is sleeved with the insulating part, current between different potentials is effectively isolated, eddy current is inhibited, electric leakage or short circuit is prevented, the safety of the molded case circuit breaker is improved, and the service life of the contact is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the low -voltage electrical technology field of power system especially relates to a static contact component and moulded case circuit breaker. BACKGROUND

[0002] The static contact is one of the key parts of the moulded case circuit breaker, and its main function is to interrupt or connect the current in the circuit. During the breaking process of the moulded case circuit breaker, an arc will be generated between the static contact and the moving contact, and the existence of the arc will cause serious erosion and damage to the static contact, and even may cause a fire or other safety accidents. In order to improve the breaking capacity of the moulded case circuit breaker and quickly extinguish the arc, the static contact with a U-shaped structure and the arc guide piece arranged at the front end of the static contact point are usually used to guide the arc into the arc extinguishing chamber to extinguish the arc, but under the action of a large current, the arc will usually cause certain damage to the static contact point, so there is still room for optimization and improvement in how to further protect the static contact point and improve the breaking capacity of the moulded case circuit breaker. SUMMARY

[0003] Therefore, the utility model aims at providing a static contact component and moulded case circuit breaker to solve the problem that the breaking capacity and static contact point protection capacity of the existing moulded case circuit breaker need to be further optimized and improved.

[0004] In order to achieve the above purpose, the utility model provides a static contact component arranged in a circuit breaker, which comprises a static contact group:

[0005] The static contact group comprises a static contact body, an arc guide piece and a magnetic enhancement piece, the static contact body is composed of a connecting part with an inverted Z shape and a contact part with an inverted U shape, and a static contact point is arranged on the top end face of the contact part;

[0006] The arc guide piece is connected to the lower surface of the static contact body, the arc guide piece is located at the front end of the static contact point, and the top end of the arc guide piece is higher than the static contact point, so as to guide the arc to the arc extinguishing chamber;

[0007] The magnetic enhancement piece is connected to the contact part and located above the static contact point, and an insulating piece is sleeved on the magnetic enhancement piece.

[0008] Preferably, a boss is vertically arranged in the circuit breaker, and the top end of the boss abuts against the bottom end face of the magnetic enhancement piece.

[0009] Preferably, a through hole is arranged at the bottom end of the contact part, and the through hole is located below the bottom end face of the magnetic enhancement piece, so as to vertically pass through the boss to fix the magnetic enhancement piece.

[0010] Preferably, the magnetic enhancement piece is designed in a U shape, the U-shaped bottom edge of the magnetic enhancement piece abuts against the back face of the contact part above the static contact point, and a perforation is arranged on the U-shaped bottom edge of the magnetic enhancement piece, so as to be connected to the groove.

[0011] Preferably, the U-shaped side edge opening of the magnetic sheet faces upward and is separated from the upper two sides of the static contact.

[0012] Preferably, the insulating member is made of nylon.

[0013] Preferably, the insulating member is provided with a hole position for avoiding the static contact, the front side of the insulating member is provided with a stop block, and the front end bottom of the insulating member is symmetrically provided with outwardly protruding protruding blocks for abutting against the side plates of the arc extinguishing chamber.

[0014] Preferably, the top end of the connecting portion is provided with a mounting hole and a screw hole for mounting and fixing.

[0015] The utility model also provides a moulded case circuit breaker, including circuit breaker, and the static contact component in the circuit breaker.

[0016] The utility model discloses the beneficial effects that the static contact body is composed of the connecting portion of inverted Z shape and the contact portion of inverted U shape, is equipped with the static contact point on the top end surface of contact portion, the arc leading piece is connected on the lower surface of static contact body, the arc leading piece is located the front end of static contact point, and the top end of arc leading piece is higher than static contact point, is used for pointing to arc extinguishing chamber and leads arc, the magnetic sheet is connected on the contact portion and is located the upper two sides position of static contact point, is favorable to magnetic field distribution, can greatly increase the electric repulsion of movable contact conducting rod, makes the moulded case circuit breaker when overloading or short circuit etc. Abnormal condition, can be faster, more reliable action, thereby provides better protection effect, improves the breaking capacity of moulded case circuit breaker, and the insulating member is sleeved on the magnetic sheet, on one hand helps fixed magnetic sheet, on one hand can effectively isolate the current between different potentials, suppresses the generation of eddy current, prevents the electric leakage or short circuit, improves the safety of moulded case circuit breaker, prolongs the service life of contact point. ACCURATE DRAWINGS

[0017] In order to more clearly illustrate the technical scheme in the utility model or the prior art, the following will briefly introduce the drawings needed to be used in embodiment or prior art description, and obviously, the drawings in the following description are only the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creating labor.

[0018] Figure 1 It is the whole structure schematic diagram of the circuit breaker of the utility model;

[0019] Figure 2 It is the structure schematic diagram of static contact body and magnetic sheet of the utility model;

[0020] Figure 3 It is the three-dimensional structure schematic diagram of magnetic sheet of the utility model;

[0021] Figure 4The side view structural schematic diagram of the magnetic shims of the utility model is shown in the figure.

[0022] Figure 5 The three-dimensional structural schematic diagram of the static contact body of the utility model is shown in the figure.

[0023] Figure 6 The three-dimensional structural schematic diagram of the insulating piece of the utility model is shown in the figure.

[0024] Marked as in the figure:

[0025] 1, circuit breaker; 2, static contact group; 3, boss; 4, arc extinguishing chamber; 5, static contact body; 6, connecting part; 7, through hole; 8, contact part; 9, magnetic shims; 10, static contact point; 11, arc starting piece; 12, bottom end face; 13, through hole; 14, round hole; 15, wide end face; 16, mounting hole; 17, screw hole; 18, riveting groove; 19, recess; 20, insulating piece; 21, protruding block; 22, stop block; 23, hole position. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the utility model more clear and obvious, the following will be further detailed in combination with specific embodiments.

[0027] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the utility model should be understood as the usual meaning by the person skilled in the art to which the utility model belongs. The "first", "second" and similar words used in the utility model do not represent any order, quantity or importance, but are only used to distinguish different components. "Include" or "contain" and similar words mean that the elements or objects before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connection" or "connected" and similar words are not limited to physical or mechanical connection, but can include electrical connection, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to represent relative positional relationship, when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0028] As Figures 1 to 6As shown in the figure, a static contact assembly is arranged in the circuit breaker 1, and the static contact assembly comprises a static contact group 2, the static contact group 2 comprises a static contact body 5, an arc striking piece 11 and a magnetic enhancement piece 9, the static contact body 5 is composed of a connecting part 6 in the shape of inverted Z and a contact part 8 in the shape of inverted U, a static contact point 10 is arranged on the top end surface of the contact part 8, the arc striking piece 11 is connected to the lower surface of the static contact body 5, the arc striking piece 11 is located at the front end of the static contact point 10, and the top end of the arc striking piece 11 is higher than the static contact point 10 and used for striking arc to the arc extinguishing chamber 4, the magnetic enhancement piece 9 is connected to the contact part 8 and located at the upper two sides of the static contact point 10, and an insulating piece 20 is sleeved on the magnetic enhancement piece 9.

[0029] The utility model discloses based on the basic structure principle of prior static contact assembly and moulded case circuit breaker, including static contact group 2, static contact group 2 includes static contact body 5, arc striking piece 11 and magnetic enhancement piece 9, static contact body 5 is integrally formed, specifically by the connecting part 6 in the shape of inverted Z and the contact part 8 in the shape of inverted U, the static contact point 10 is welded and arranged on the top end surface of contact part 8, arc striking piece 11 rivets in the lower surface of static contact body 5, arc striking piece 11 is located at the front end of static contact point 10, and the top end of arc striking piece 11 is higher than static contact point 10, when the moulded case circuit breaker breaks, help through arc striking piece 11 fast arc to arc extinguishing chamber 4 extinguish, magnetic enhancement piece 9 is connected to contact part 8 and located at the upper two sides of static contact point 10, the special shape of magnetic enhancement piece 9 is favorable to magnetic field distribution, can greatly increase the electric repulsion of moving contact conducting rod, when the moulded case circuit breaker occurs overload or short circuit etc. Abnormal condition, can be faster, more reliable action, thereby provide better protection effect, improve the breaking capacity of moulded case circuit breaker, magnetic enhancement piece 9 is sleeved with insulating piece 20, on the one hand help fixed magnetic enhancement piece 9, on the one hand can effectively isolate the current between different potentials, suppress the generation of eddy current, prevent electric leakage or short circuit, improve the safety of moulded case circuit breaker, prolong the service life of contact point.

[0030] In the embodiment of the utility model, as shown in the figure, Figures 1 to 6 The boss 3 is vertically arranged in the circuit breaker 1, the back surface of the contact part 8 is provided with a groove 19, and the groove 19 is a square groove, which is helpful to divide the large current into several small currents, reduce the current density and improve the heat dissipation performance, and is helpful to prolong the service life of the static contact and the static contact point 10.

[0031] In the embodiment of the utility model, as shown in the figure, Figures 1 to 6 The bottom end of the contact part 8 is provided with a through hole 7, and the through hole 7 is a square hole, which is arranged below the bottom end of the magnetic enhancement piece 9, and is used for vertically penetrating the boss 3 to fix the magnetic enhancement piece 9, and is also helpful to the current shunt to protect the static contact and the static contact point 10.

[0032] The riveting groove 18 is further arranged beside the through hole 7 for installation.

[0033] In the embodiment of the utility model, as shown in Figures 1 to 6 The magnetic sheet 9 is designed as a U-shaped shape, the U-shaped bottom edge of the magnetic sheet 9 is abutted to the upper back surface of the contact part 8 at the static contact point 10, a perforation 13 is formed in the U-shaped bottom edge of the magnetic sheet 9, the perforation 13 is a square hole, a plurality of round holes 14 are further arranged on the side of the perforation 13, and the round holes 14 are used for being connected with the grooves 19, which all help to divide the large current into several small currents, reduce the current density and improve the heat dissipation performance, and help to prolong the service life of the static contact head and the static contact point 10.

[0034] In the embodiment of the utility model, as shown in Figures 1 to 6 The U-shaped side edge of the magnetic sheet 9 is upwardly opened and is separately arranged on the two sides above the static contact point 10, the lower end opening of the U-shaped side edge of the magnetic sheet 9 is wider, the upper end opening is narrower, and the wide-to-narrow transition is arc-shaped connection, which is just conducive to the sleeve connection of the bottom end surface 12 of the magnetic sheet 9 below the static contact point 10, and the side end surface of the magnetic sheet 9 is designed as a shape that the upper half is wide and the lower half is narrow.

[0035] In the embodiment of the utility model, as shown in Figures 1 to 6 The insulating part 20 is made of nylon material, which has good insulation performance and does not affect the effect of the magnetic sheet 9.

[0036] In the embodiment of the utility model, as shown in Figures 1 to 6 The insulating part 20 is provided with a hole position 23 for avoiding the static contact point 10, the front side of the insulating part 20 is provided with a stop block 22, the height of the stop block 22 is below the magnetic sheet 9, the strength of the insulating part 20 can be enhanced, the arc striking of the arc striking sheet 11 is not affected, the front end bottom of the insulating part 20 is symmetrically provided with outwardly protruding protrusions 21 on both sides, which are used for being connected with the side plates of the arc extinguishing chamber, when the insulating part 20 is installed, the wide end surface 15 of the upper half of the magnetic sheet 9 can be mainly covered, the side plates of the arc extinguishing chamber 4 can be just pressed on the protrusions 21, so that the insulating part 20 is better fixed.

[0037] In the embodiment of the utility model, as shown in Figures 1 to 6 The top end of the connecting part 6 is provided with a mounting hole 16 and a screw hole 17 for mounting and fixing, the static contact head body 5 and the magnetic sheet 9 are mainly fixed through the screw hole 17 of the connecting part 6, the boss 3 and the insulating part 20, and the mounting hole 16 is used for external wiring through a hexagonal nut.

[0038] The utility model also provides a moulded case circuit breaker, which comprises a circuit breaker 1 and a static contact assembly arranged in the circuit breaker 1.

[0039] It should be understood by those of ordinary skill in the art that the discussion of any of the above embodiments is merely exemplary and is not intended to suggest that the scope of the present application is limited to these examples; under the idea of the present application, the above embodiments or technical features among different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes of different aspects of the present application as described above. In order to be brief, they are not provided in detail.

Claims

1. A static contact assembly arranged in a circuit breaker (1), comprising a static contact group (2), characterized in that: the static contact group (2) comprises a static contact body (5), an arc striking piece (11) and a magnetic enhancement piece (9), the static contact body (5) is composed of a connecting part (6) in the shape of inverted Z and a contact part (8) in the shape of inverted U, and a static contact point (10) is arranged on the top end face of the contact part (8); the arc striking piece (11) is connected to the lower surface of the static contact body (5), and the arc striking piece (11) is located at the front end of the static contact point (10), and the top end of the arc striking piece (11) is higher than the static contact point (10) and used for striking arc towards an arc extinguishing chamber (4); the magnetic enhancement piece (9) is connected to the contact part (8) and located above the static contact point (10) on both sides, and an insulating piece (20) is sleeved on the magnetic enhancement piece (9).

2. A stationary contact assembly according to claim 1, characterized in that a boss (3) is vertically arranged in the circuit breaker (1), and the top end of the boss (3) abuts against the bottom end face (12) of the magnetic enhancement piece (9).

3. A stationary contact assembly according to claim 2, characterized in that a through hole (7) is formed in the bottom end of the contact part (8), and the through hole (7) is located below the bottom end face (12) of the magnetic enhancement piece (9) and used for vertically penetrating the boss (3).

4. A stationary contact assembly according to claim 2, characterized in that the magnetic enhancement piece (9) is designed in the shape of U, the U-shaped bottom edge of the magnetic enhancement piece (9) abuts against the back face of the contact part (8) above the static contact point (10), and a through hole (13) is formed in the U-shaped bottom edge of the magnetic enhancement piece (9) and used for abutting against the groove (19).

5. A stationary contact assembly according to claim 1, characterized in that the U-shaped side edges of the magnetic enhancement piece (9) are upwardly open and separately located above both sides of the static contact point (10).

6. A stationary contact assembly according to claim 1, characterized in that the insulating piece (20) is made of nylon material.

7. A stationary contact assembly according to claim 1, characterized in that the insulating piece (20) is provided with a hole position (23) for avoiding the static contact point (10), the front side of the insulating piece (20) is provided with a stop block (22), and the front end bottom of the insulating piece (20) is symmetrically provided with outwardly protruding lugs (21) used for abutting against the side plates of the arc extinguishing chamber (4).

8. A stationary contact assembly according to claim 1, characterized in that the top end of the connecting part (6) is provided with a mounting hole (16) and a screw hole (17) used for mounting and fixing.

9. A molded case circuit breaker (1), comprising a circuit breaker (1) and the static contact assembly according to any one of claims 1-8 arranged in the circuit breaker (1).

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