Molded case circuit breaker

Abstract

The utility model discloses a molded case circuit breaker, which comprises a base, a plurality of mounting cavities are arranged in the base, a baffle plate is fixedly connected between the two mounting cavities, an operating mechanism is erected on the baffle plate, and a moving contact is fixedly connected at the bottom of the operating mechanism at a position opposite to the mounting cavities. The bottom of the inner wall of the installation cavity is fixedly connected with a static contact, a protection seat and an arc extinguishing device are arranged in the installation cavity and located over the static contact in a sleeved mode, and the protection seat is connected with the arc extinguishing device in an inserted mode. Through the protection seat, the protection seat is sleeved in the installation cavity, under the condition of large current, the possibility that an electric arc is dispersed to the periphery is effectively prevented, and meanwhile the risk that the electric arc breaks down the baffle is also prevented; and through the structural arrangement, the gap between the operating mechanism and the circuit breaker base is reduced, the centering performance of the moving contact on the operating mechanism and the static contact in the circuit breaker base is improved, and the service life of the molded case circuit breaker is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a molded case circuit breaker. Background Art

[0002] A circuit breaker is a current switching device used to distribute electrical energy and provide real-time protection for power lines and motors. It can carry, close, and disconnect the current in the normal circuit according to the normal, overload, short-circuit, and undervoltage conditions of the circuit, thereby ensuring the safety of the circuit. With the continuous development of circuit breakers, circuit breakers are required to have over-temperature protection in some specific environments. The so-called over-temperature protection means that when an abnormality occurs and the temperature of the copper busbar of the circuit breaker gradually increases, the circuit breaker will quickly open when the threshold is reached to avoid accidents.

[0003] At present, when the fault current of the existing molded case circuit breaker is large, the circuit breaker breaks the large current, and a large number of arcs are generated. The arc will quickly spread around under the strong air blowing pressure. If there is a gap between the three phases of the molded case circuit breaker, the scattered arc will easily cause an internal short circuit and reduce the breaking capacity of the circuit breaker; at the same time, the operating mechanism will vibrate under the action of frequent closing and opening, so that under long-term conditions, a gap will be generated between the operating mechanism and the circuit breaker base, making the moving contact on the operating mechanism and the static contact in the circuit breaker base poorly neutral, thereby reducing the service life of the molded case circuit breaker. Summary of the invention

[0004] The purpose of the utility model is to provide a molded case circuit breaker to solve the problem mentioned in the above background technology that when the fault current of the existing molded case circuit breaker is large, the circuit breaker breaks the large current, and a large number of arcs are generated. The arc will quickly spread around under the strong air blowing pressure. If there is a gap between the three phases of the molded case circuit breaker, the scattered arc will easily cause an internal short circuit and reduce the breaking capacity of the circuit breaker; at the same time, the operating mechanism will vibrate under the action of frequent closing and opening, so that under long-term conditions, a gap will be generated between the operating mechanism and the circuit breaker base, making the moving contact on the operating mechanism and the static contact in the circuit breaker base poorly neutral, thereby reducing the service life of the molded case circuit breaker.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a molded case circuit breaker, comprising a base, a plurality of installation cavities are opened in the base, and a baffle is fixedly connected between two of the installation cavities, an operating mechanism is mounted on the baffle, a moving contact is fixedly connected to the bottom of the operating mechanism at a relative position of the installation cavity, a static contact is fixedly connected to the bottom of the inner wall of the installation cavity, a protective seat and an arc extinguishing device are sleeved in the installation cavity just above the static contact, and the protective seat is plug-connected to the arc extinguishing device.

[0006] Preferably, the protective seat includes a mounting seat, a first side plate, a second side plate and a connecting plate, the first side plate and the second side plate are fixedly connected to both sides of the top of the mounting seat, and the connecting plate is fixedly connected to one end of the mounting seat away from the first side plate and the second side plate.

[0007] Preferably, a connection opening is provided on the bottom surface of the mounting seat between the first side plate and the second side plate.

[0008] Preferably, a plurality of first reinforcing ribs are fixedly connected to the inner wall of the installation cavity.

[0009] Preferably, avoidance positions are provided on the surfaces of the first side plate and the second side plate, and reinforcing ribs are fixedly connected to the middle of the avoidance positions.

[0010] Preferably, the opening size of the connection port is adapted to the size of the static contact.

[0011] Preferably, a mounting position is formed between the first side plate, the second side plate and the connecting plate, and an arc extinguishing device is sleeved on the mounting position.

[0012] Beneficial Effects

[0013] Compared with the existing technology, the beneficial effects of the utility model are:

[0014] By using the protective seat provided in the utility model, the protective seat sleeve is arranged in the installation cavity, which can effectively prevent the arc from spreading to the surroundings in the case of large current, and also prevent the risk of the arc breaking through the baffle; and through this structural setting, the gap between the operating mechanism and the circuit breaker base is reduced, the neutrality of the moving contact on the operating mechanism and the static contact in the circuit breaker base is improved, and the service life of the molded case circuit breaker is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the coordination structure of the protection seat and the arc extinguishing device of the utility model;

[0017] Figure 3 This is a schematic diagram of the protection seat structure of the utility model;

[0018] Figure 4 It is a schematic diagram of the base structure of the utility model.

[0019] 1. Base; 2. Installation cavity; 3. Operating mechanism; 4. Protection seat; 5. Arc extinguishing device; 6. Moving contact;

[0020] 7. static contact; 8. baffle; 9. first reinforcing rib; 41. mounting seat; 42. first side plate;

[0021] 43. Second side plate; 44. Connecting plate; 45. Avoidance position; 46. Second reinforcing rib; 47. Connecting port;

[0022] 48. Installation position. DETAILED DESCRIPTION

[0023] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "front", "back", "inside", "outside", "vertical", "horizontal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore are not to be construed as limiting the present invention. In addition, the terms "first", "second" and "third" are only used for descriptive purposes and are not to be construed as indicating or implying relative importance.

[0025] like Figure 1-4 It is a structural schematic diagram of a molded case circuit breaker of a preferred embodiment of the utility model. In this embodiment, a molded case circuit breaker includes a base 1, a plurality of mounting cavities 2 are provided in the base 1, and a baffle 8 is fixedly connected between two mounting cavities 2, so that each mounting cavity 2 can be separated from each other, ensuring that it can be safer and more stable in use. An operating mechanism 3 is mounted on the baffle 8, and a moving contact 6 is fixedly connected to the bottom of the operating mechanism 3 at a relative position to the mounting cavity 2, and a static contact 7 is fixedly connected to the bottom of the inner wall of the mounting cavity 2, and the moving contact 6 and the static contact 7 are connected to each other. The closure and release of the contact 7 realize the closing and opening of the molded case circuit breaker. A protection seat 4 and an arc extinguishing device 5 are provided in the installation cavity 2 directly above the static contact 7. The protection seat 4 is plugged into the arc extinguishing device 5. This structural setting solves the problem of effectively preventing the arc from spreading to the surroundings in the case of high current, and also prevents the risk of the arc breaking through the baffle. This structural setting reduces the gap between the operating mechanism and the base 1, improves the neutrality of the moving contact 6 on the operating mechanism and the static contact 7 in the circuit breaker base, and increases the service life of the molded case circuit breaker.

[0026] In this embodiment, the protection seat 4 includes a mounting seat 41, a first side plate 42, a second side plate 43 and a connecting plate 44. The first side plate 42 and the second side plate 43 are fixedly connected to both sides of the top of the mounting seat 41. By setting the first side plate 42 and the second side plate 43, the protection strength of the baffle 8 can be enhanced to ensure that the arc generated during the operation of the circuit breaker cannot break through, thereby improving the service life of the molded case circuit breaker. A connecting plate 44 is fixedly connected to one end of the mounting seat 41 away from the first side plate 42 and the second side plate 43. The connecting plate 44 is plugged under the wiring terminal of the molded case circuit breaker to fix the position of the protection seat 4.

[0027] In this embodiment, a connection port 47 is provided on the bottom surface of the mounting seat 41 between the first side plate 42 and the second side plate 43. The connection port 47 provides a contact position for the static contact 7 to avoid blocking the static contact 7 due to the installation of the protective seat 4, which causes the static contact 7 and the moving contact 6 to be unable to work.

[0028] In this embodiment, a plurality of first reinforcing ribs 9 are fixedly connected to the inner wall of the installation cavity 2 to strengthen the connection strength between the baffle 8 and the base 1 .

[0029] In this embodiment, avoidance positions 45 are provided on the surfaces of the first side panel 42 and the second side panel 43 to avoid position conflict between the protection seat 4 installed in the installation cavity 2 and the first reinforcing rib 9, which makes it impossible to be installed in the installation cavity 2, and a second reinforcing rib 46 is fixedly connected to the middle of the avoidance position 45 to increase the connection strength between the installation seat 41 and the first side panel and the second side panel. At the same time, the staggered positions of the first reinforcing rib 9 and the second reinforcing rib 46 are used to support each other and prevent the protection seat 4 from shaking in the installation cavity 2.

[0030] In this embodiment, the opening size of the connection port 47 is adapted to the size of the fixed contact 7 .

[0031] In this embodiment, a mounting position 48 is formed between the first side plate 42, the second side plate 43 and the connecting plate 44, and an arc extinguishing device 5 is sleeved on the mounting position 48, so as to extinguish the arc when the molded case circuit breaker is working.

[0032] The above content is a further detailed description of the utility model in combination with specific implementation methods. It cannot be determined that the specific implementation of the utility model is limited to these descriptions. For ordinary technicians in the technical field to which the utility model belongs, without departing from the concept of the utility model, they can also make several simple deductions or substitutions, which should be regarded as belonging to the scope of protection determined by the claims submitted for the utility model.

Claims

1. A molded case circuit breaker, comprising a base (1), characterized in that: A plurality of installation cavities (2) are provided in the base (1), and a baffle (8) is fixedly connected between two of the installation cavities (2), an operating mechanism (3) is mounted on the baffle (8), a moving contact (6) is fixedly connected to the bottom of the operating mechanism (3) at a relative position to the installation cavity (2), a static contact (7) is fixedly connected to the bottom of the inner wall of the installation cavity (2), a protective seat (4) and an arc extinguishing device (5) are sleeved in the installation cavity (2) and located directly above the static contact (7), and the protective seat (4) is plug-connected to the arc extinguishing device (5).

2. A molded case circuit breaker according to claim 1, characterized in that: The protection seat (4) comprises a mounting seat (41), a first side plate (42), a second side plate (43) and a connecting plate (44); the first side plate (42) and the second side plate (43) are respectively fixedly connected to the top two sides of the mounting seat (41); and the connecting plate (44) is fixedly connected to one end of the mounting seat (41) away from the first side plate (42) and the second side plate (43).

3. A molded case circuit breaker according to claim 2, characterized in that: A connection opening (47) is provided on the bottom surface of the mounting seat (41) between the first side plate (42) and the second side plate (43).

4. A molded case circuit breaker according to claim 1, characterized in that: A plurality of first reinforcing ribs (9) are fixedly connected to the inner wall of the installation cavity (2).

5. A molded case circuit breaker according to claim 2, characterized in that: The surfaces of the first side plate (42) and the second side plate (43) are both provided with an avoidance position (45), and a second reinforcing rib (46) is fixedly connected to the middle of the avoidance position (45).

6. A molded case circuit breaker according to claim 3, characterized in that: The opening size of the connection port (47) is adapted to the size of the stationary contact (7).

7. A molded case circuit breaker according to claim 2, characterized in that: An installation position (48) is formed between the first side plate (42), the second side plate (43) and the connecting plate (44), and an arc extinguishing device (5) is sleeved on the installation position (48).

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