Circuit breaker static contact assembly and circuit breaker

Abstract

The utility model discloses a static contact assembly of a circuit breaker, which belongs to the field of circuit breakers and comprises a connecting plate, a notch is arranged on one side of the connecting plate, a protrusion is integrally formed on the top surface of one end of the connecting plate, a static contact is arranged above the protrusion, and an arc striking sheet is fixedly mounted in the middle of the notch. The arc striking sheet comprises a connecting part, a bending part and an arc guide part, the connecting part is fixedly arranged below the bulge, and the bending part protrudes upwards to be flush with the static contact and then bends downwards to the position below the connecting plate to the upper surface of the bottom of the shell; according to the utility model, a small arc extinguish chamber area between the lower part of the connecting plate and the arc striking sheet is subjected to the action of a magnetic field jointly generated by the current of the downward bending section of the connecting plate and the arc striking sheet, and the acting force of the magnetic field on the electric arc in the small arc extinguish chamber area enables the electric arc to face the grid sheet direction of the small arc extinguish chamber, so that the electric arc can quickly enter the arc extinguish chamber; and the grid sheets below the arc extinguish chamber are fully utilized, so that the breaking capacity of the circuit breaker is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of circuit breaker, more specifically, a circuit breaker static contact assembly and circuit breaker. BACKGROUND

[0002] The main task of low-voltage circuit breaker is to protect the circuit system when the circuit has a short-circuit fault, which is mainly composed of a shell, a static contact, a moving contact, an arc extinguishing chamber and an operating mechanism. When the circuit has a short-circuit fault, the circuit breaker releases the lock to separate the static contact and the moving contact, and then generates an arc between the static contact and the moving contact. The arc enters the arc extinguishing chamber under the action of the magnetic field and is cut into multiple short arcs by the arc extinguishing chamber grid. Each short arc has a near-pole voltage drop, and the arc voltage rises rapidly. The more the number of grid pieces, the more the number of short arcs formed, and the higher the arc voltage. The increase of arc voltage can rapidly reduce the arc current, and ultimately extinguish the arc to cut off the fault circuit. Therefore, it is particularly important to set as many arc extinguishing grids as possible in the limited space of the circuit breaker and set an arc guide plate to make each grid fully utilized.

[0003] Figure 4 It is the internal structure diagram of the circuit breaker in patent CN217822644U, mainly including a connecting plate, a reverse bending part and an arc guide piece, a static contact point is arranged on the reverse bending part, the arc guide piece includes a connecting part, a bending part and an arc guiding part, the connecting part is fixedly arranged below the reverse bending part, the bending part protrudes upward to be substantially flush with the static contact point, and then bends downward to the upper side of the connecting plate, and the arc guiding part is substantially parallel to the connecting plate. The utility model can effectively improve the arc voltage during the breaking of the circuit breaker, make the arc extinguish quickly, improve the breaking capacity of the circuit breaker, and the space between the static contact point and the static contact connecting plate can be fully utilized.

[0004] In the prior art, when the circuit has a short-circuit fault, the circuit breaker releases the lock to separate the static contact and the moving contact, and then generates an arc between the static contact and the moving contact. The arc enters the arc extinguishing chamber under the action of the magnetic field through the arc guide piece. However, the arc extinguishing chamber of this scheme has a problem. During the process of the lower arc entering the lower grid piece of the arc extinguishing chamber, the magnetic field generated by the current passing through the static contact connecting plate below the arc guide piece is not conducive to the arc entering the arc extinguishing chamber, the arc voltage cannot be further improved, and the breaking performance of the circuit breaker is affected. SUMMARY

[0005] 1. Technical problem to be solved

[0006] In view of the problems in the prior art, the circuit breaker static contact assembly and the circuit breaker can realize that the area of the small arc extinguishing chamber between the lower side of the connecting plate and the arc leading piece is subjected to the magnetic field generated by the downward bending current of the connecting plate and the arc leading piece, the magnetic field has a force on the arc in the small arc extinguishing chamber area, the force is to make the arc go to the direction of the small arc extinguishing chamber grid piece, the arc can quickly enter the arc extinguishing chamber, the grid piece under the arc extinguishing chamber is fully utilized, and therefore the breaking capacity of the circuit breaker is improved.

[0007] 2. Technical scheme

[0008] To solve the above problems, the utility model adopts the following technical scheme.

[0009] A circuit breaker static contact assembly, comprising a connecting plate, a cutout is formed in one side of the connecting plate, a protrusion is integrally formed on the top surface of one end of the connecting plate, a static contact point is arranged above the protrusion, and an arc leading piece is fixedly installed in the middle of the cutout.

[0010] Further, the arc leading piece comprises a connecting portion, a bending portion and an arc guiding portion.

[0011] Further, the connecting portion is fixedly arranged below the protrusion.

[0012] Further, the bending portion is upwardly protruded to be flush with the static contact point, and then downwardly bent to the upper surface of the bottom of the shell below the connecting plate.

[0013] Further, a small arc extinguishing chamber is arranged between the connecting plate and the bending portion.

[0014] On the other hand, the utility model further discloses a circuit breaker, comprising a circuit breaker shell, a dial lever is rotatably installed on the top of the circuit breaker shell, an operating mechanism is arranged below the dial lever in the circuit breaker shell, a large arc extinguishing chamber is arranged on one side of the operating mechanism in the circuit breaker shell, a movable contact is movably arranged in the large arc extinguishing chamber, the large arc extinguishing chamber is above the small arc extinguishing chamber, and a release is arranged on the other side of the operating mechanism in the circuit breaker shell.

[0015] 3. Advantage

[0016] Compared with the prior art, the utility model has the advantages that:

[0017] (1) the scheme utilizes the magnetic field generated by the downward bending current of the connecting plate and the arc leading piece on the area of the small arc extinguishing chamber between the lower side of the connecting plate and the arc leading piece, the magnetic field has a force on the arc in the small arc extinguishing chamber area, the force is to make the arc go to the direction of the small arc extinguishing chamber grid piece, the arc can quickly enter the arc extinguishing chamber, the grid piece under the arc extinguishing chamber is fully utilized, and therefore the breaking capacity of the circuit breaker is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the whole structure schematic view in the utility model;

[0019] Figure 2 It is the circuit breaker internal structure schematic view in the utility model;

[0020] Figure 3 It is the connecting plate structure schematic view in the utility model;

[0021] Figure 4 It is the circuit breaker internal structure schematic view in the background technology in the utility model;

[0022] Figure 5 It is the arc striking piece component structure schematic view in the utility model.

[0023] Mark explanation in the drawing:

[0024] 1, circuit breaker shell;2, lever;3, big arc chamber;4, connecting plate;5, small arc chamber;6, movable contact;7, operating mechanism;8, release;402, cutout;403, static contact;404, protrusion;405, arc striking piece. Specific implementation

[0025] The technical scheme in the utility model embodiment will be clearly and completely described below with reference to the drawings in the utility model embodiment; Obviously, the described embodiment is only a part of the embodiment of the utility model, not all the embodiment, based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor are within the protection scope of the utility model.

[0026] In the description of the utility model, it needs to be explained that the orientation or position relation indicated by the terms "upper", "lower", "inner", "outer", "top / bottom end" is based on the orientation or position relation shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as the limitation of the utility model. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0027] In the description of the utility model, it is necessary to explain, unless another explicit provision and limitation, the term "installation", "set with", "sleeve set / interface", "connection" and so on, should do broad sense understanding, for example "connection", can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through intermediate medium, can be the communication inside two elements.For the ordinary skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.

[0028] Embodiment 1:

[0029] Please refer to Figures 1-3 And Figure 5 A circuit breaker, comprising a circuit breaker housing 1 and a circuit breaker static contact assembly as described above, the top of the circuit breaker housing 1 is rotatably installed with a lever 2, the inside of the circuit breaker housing 1 is provided with an operating mechanism 7 below the lever 2, one side of the operating mechanism 7 is provided with a large arc chamber 3 inside the circuit breaker housing 1, the inside of the large arc chamber 3 is movably provided with a moving contact 6, the large arc chamber 3 is above the small arc chamber 5, the inside of the circuit breaker housing 1 is provided with a trip unit 8 on the other side of the operating mechanism 7.

[0030] Specifically, the circuit breaker static contact assembly comprises a connecting plate 4, one side of the connecting plate 4 is provided with a cutout 402, the top surface of one end of the connecting plate 4 is integrally formed with a protrusion 404, the upper side of the protrusion 404 is provided with a static contact point 403, and the middle of the cutout 402 is fixedly installed with an arc guiding piece 405.

[0031] Specifically, the arc guiding piece 405 comprises a connecting portion, a bending portion and an arc guiding portion, the connecting portion is fixedly arranged below the protrusion 404, the bending portion protrudes upward to be flush with the static contact point 403, and then bends downward to the upper surface of the bottom of the housing below the connecting plate 4, the current direction is changed through the bending portion, then the current direction of the connecting plate 4 is matched, a magnetic field is formed between the two, the electric arc enters the inside of the small arc chamber 5 through the formed magnetic field, the arc is extinguished by the grid fins of the small arc chamber 5, the utilization efficiency of the small arc chamber 5 is effectively improved, and the breaking effect of the whole circuit breaker is also improved.

[0032] It should be noted that the connecting plate 4 is fixedly connected by being provided with threaded holes on the surface and fastening members such as bolts, and the position is between the large arc chamber 3 and the small arc chamber 5.

[0033] The working principle of the utility model is that the region of the small arc extinguishing chamber 5 between the lower part of the connecting plate 4 and the arc leading piece 405 is affected by the magnetic field generated by the downward bending section current of the connecting plate 4 and the arc leading piece 405, the force of the magnetic field on the arc in the region of the small arc extinguishing chamber 5 is to make the arc go to the direction of the grid piece of the small arc extinguishing chamber 5, the arc can quickly enter the arc extinguishing chamber, the grid piece under the arc extinguishing chamber is fully utilized, and thus the breaking capacity of the circuit breaker is improved.

[0034] The above is only the preferred specific implementation manner of the utility model; but the protection scope of the utility model is not limited to this. Any skilled person in the art, according to the technical scheme and the improvement concept of the utility model, within the technical range disclosed by the utility model, should be covered in the protection scope of the utility model.

Claims

1. A circuit breaker stationary contact assembly comprising a link plate (4), characterized in that: The joint plate (4) is provided with a cutout (402) on one side, and the top surface of one end of the joint plate (4) is integrally formed with a protrusion (404), and a static contact (403) is arranged above the protrusion (404), and an arc striking piece (405) is fixedly installed in the middle of the cutout (402).

2. The stationary contact assembly of claim 1, wherein: The arc striking piece (405) comprises a connecting portion, a bending portion and an arc guiding portion.

3. The circuit breaker stationary contact assembly of claim 2, wherein: The connecting portion is fixedly arranged below the protrusion (404).

4. The circuit breaker stationary contact assembly of claim 2, wherein: The bending portion protrudes upward to be flush with the static contact (403), and then bends downward to the upper surface of the bottom of the shell below the joint plate (4).

5. The stationary contact assembly of claim 1, wherein: A small arc extinguishing chamber (5) is arranged between the joint plate (4) and the bending portion.

6. A circuit breaker comprising a circuit breaker housing (1) and a circuit breaker stationary contact assembly as claimed in any of the preceding claims, characterized in that A lever (2) is rotatably arranged on the top of the circuit breaker shell (1), an operating mechanism (7) is arranged below the lever (2) in the circuit breaker shell (1), a large arc extinguishing chamber (3) is arranged on one side of the operating mechanism (7) in the circuit breaker shell (1), a movable contact (6) is movably arranged in the large arc extinguishing chamber (3), the large arc extinguishing chamber (3) is arranged above the small arc extinguishing chamber (5), and a release (8) is arranged on the other side of the operating mechanism (7) in the circuit breaker shell (1).

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