Molded case circuit breaker with pressure relief function

Abstract

The utility model discloses a molded case circuit breaker with a pressure relief function, which comprises a shell and a cover plate covered on the shell, the shell is provided with a plurality of arc extinguish chambers, the inlets of the arc extinguish chambers are sequentially provided with baffle sheets and arc baffle sheets and are embedded into the cover plate, and the baffle sheets and the arc baffle sheets are embedded into the arc extinguish chambers. A wiring terminal is arranged right in front of the arc blocking piece, channels inclining downwards are arranged on the two sides of the arc blocking piece, the channels are attached to the two sides of the wiring terminal, a plurality of first blocking plates at equal intervals are inserted in the channels, and second blocking plates are arranged between the first blocking plates. According to the utility model, high-temperature and high-pressure gas in the shell is quickly exhausted through the channel, and through the first retarding plate, the second retarding plate and the staggered pressure relief holes, not only is the advancing distance of the high-temperature and high-pressure gas prolonged, but also the flow rate of the high-pressure gas is reduced, so that the purpose of quickly eliminating residual flashover is achieved; and the product has the advantages of pressure relief effect and zero flashover.

Description

Technical Field

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

[0002] Circuit breakers are divided into high-voltage circuit breakers and low-voltage circuit breakers according to their application scopes. A low-voltage circuit breaker, also known as an automatic switch and commonly called an "air switch", is an electrical appliance that has both the functions of a manual switch and can automatically perform undervoltage, overvoltage, overload, and short-circuit protection. It can be used to distribute electric energy, start asynchronous motors infrequently, protect power supply lines and motors, etc. When they encounter serious overload, short-circuit, undervoltage and other faults, it can automatically cut off the circuit, and generally does not need to change components after breaking the fault current, and has been widely used.

[0003] When the existing molded case circuit breaker is disconnected, an arc will be generated instantaneously when the moving and static contacts are separated. The high-temperature and high-pressure gas generated by the arc accumulates in the shell and cannot be effectively guided and discharged, resulting in damage to the components in the shell by the high-temperature and high-pressure gas, and further reducing the service life of the arc extinguishing grid. Therefore, the applicant has made a beneficial design and found a solution to the above problems. The technical solution to be introduced below was generated under this background. Summary of the Invention

[0004] The purpose of the utility model is to overcome the deficiencies of the existing molded case circuit breaker design, and provide a product with a pressure relief effect and zero arc flash.

[0005] To solve the above problems, the utility model adopts the following technical solutions.

[0006] A molded case circuit breaker with a pressure relief function includes a shell and a cover plate covering the shell. The shell is provided with a plurality of arc extinguishing chambers. A baffle and an arc baffle are successively arranged at the entrance of the arc extinguishing chamber and are embedded in the cover plate. A terminal is arranged directly in front of the arc baffle. Inclined downward channels are arranged on both sides of the arc baffle, and the channels are attached to both sides of the terminal. A plurality of equally spaced first retardation plates are inserted into the channels. A second retardation plate is arranged between the first retardation plates. The first retardation plates and the second retardation plate are provided with a plurality of pressure relief holes. The pressure relief holes of the first retardation plates and the pressure relief holes of the second retardation plate are arranged in a staggered manner. The baffle is provided with a plurality of through holes and is arranged at the entrance of the channel.

[0007] Preferably, relief grooves are arranged on both sides at the entrance of the arc extinguishing chamber.

[0008] Preferably, the cover plate is provided with a slot.

[0009] Preferably, the baffle plate and the arc baffle plate are provided with extension parts on both sides and are inserted in the clearance groove, and the baffle plate and the arc baffle plate are provided with fixing parts on the top and are inserted in the slot.

[0010] Preferably, the passage and the terminal are spaced apart to allow the fastening screws of the terminal to be raised and lowered, and the passage is provided with a plurality of avoidance grooves for accommodating the first buffer plate and the second buffer plate.

[0011] Preferably, the first baffle plate and the second baffle plate are provided with limiting parts on both sides of the top and abut against the outer wall of the channel, and the first baffle plate and the second baffle plate are provided with protrusions on both sides and abut against the side walls of the avoidance groove.

[0012] Beneficial effects:

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] According to the utility model, the high-temperature and high-pressure gas generated by the electric arc is quickly depressurized and discharged through the inclined channel, so as to prevent the high-temperature and high-pressure gas from accumulating in the shell and damaging the components; most of the arcs that cannot be eliminated by the arc extinguishing chamber are blocked by the blocking plate, and through the multiple first buffer plates, the second buffer plates, and the staggered pressure relief holes, not only the travel distance of the high-temperature and high-pressure gas is extended, but also the flow rate of the high-pressure gas is reduced, so as to achieve the purpose of quickly eliminating the remaining arcs, avoid the arcs from causing harm to the lines connected to the wiring terminals and the nearby electrical equipment, so that the product has the advantages of pressure relief effect and zero arcs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural schematic diagram of a molded case circuit breaker with a pressure relief function according to the utility model;

[0016] Figure 2 A schematic diagram of the side cross-sectional structure of a molded case circuit breaker with a pressure relief function according to the utility model Figure 1 ;

[0017] Figure 3 The utility model Figure 2 A partial structure enlarged view of detail A of a molded case circuit breaker with a pressure relief function;

[0018] Figure 4 This is a disassembly of a molded case circuit breaker with pressure relief function of the utility model Figure 1 ;

[0019] Figure 5 This is a disassembly of a molded case circuit breaker with pressure relief function of the utility model Figure 2 ;

[0020] Figure 6 The side cross-sectional structure of a molded case circuit breaker with pressure relief function of the utility model is shown in FIG.Figure 2 ;

[0021] The corresponding relationships between the reference signs and the component names in the figure are as follows:

[0022] Reference signs: 1, housing; 2, cover plate; 3, retaining piece; 4, arc-blocking piece; 5, extension part; 6, fixing part; 11, arc extinguishing chamber; 12, terminal; 13, relief groove; 21, slot; 31, through hole; 41, channel; 42, first retarder plate; 43, second retarder plate; 44, pressure relief hole; 45, limiting part; 46, bump; 411, avoidance groove. Detailed implementation manners

[0023] The technical solutions of the present utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0024] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "left", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model 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 should not be construed as a limitation to the present utility model.

[0025] In the embodiments of the present utility model, "and / or" only describes the associated relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0026] Reference example Figures 1 to 6, A molded case circuit breaker with a pressure relief function, comprising a housing 1 and a cover plate 2 covering the housing 1. The housing 1 is provided with a plurality of arc extinguishing chambers 11. At the entrance of the arc extinguishing chamber 11, a baffle 3 and an arc blocking plate 4 are successively provided and embedded in the cover plate 2. A terminal 12 is provided directly in front of the arc blocking plate 4. On both sides of the arc blocking plate 4, there are inclined downward channels 41, and the channels 41 are attached to both sides of the terminal 12. A plurality of equally spaced first retardation plates 42 are inserted in the channels 41. A second retardation plate 43 is provided between the first retardation plates 42. The first retardation plates 42 and the second retardation plates 43 are provided with a plurality of pressure relief holes 44. The pressure relief holes 44 of the first retardation plates 42 and the pressure relief holes 44 of the second retardation plates 43 are arranged in a staggered manner. The baffle 3 is provided with a plurality of through holes 31 and is arranged at the entrance of the channel 41. The inclined channels 41 increase the passing amount of high-temperature and high-pressure gas in the same time, and can also increase the installation of a plurality of first retardation plates 42 and second retardation plates 43 to strengthen the effect of zero arc flash. The high-temperature and high-pressure gas generated by the arc is quickly discharged through the inclined channels 41 to prevent the high-temperature and high-pressure gas from accumulating in the housing 1 and damaging the components; most of the arc flashes that cannot be eliminated by the arc extinguishing chamber 11 are blocked by the baffle 3. Through a plurality of first retardation plates 42, second retardation plates 43, and the staggered pressure relief holes 44, not only the traveling distance of the high-temperature and high-pressure gas is extended, but also the flow rate of the high-pressure gas is reduced, so as to achieve the purpose of quickly eliminating the remaining arc flashes and avoiding the harm caused by the arc flashes to the circuit connected to the terminal 12 and the electrical equipment nearby;

[0027] It is worth mentioning that on both sides of the entrance of the arc extinguishing chamber 11, there are relief grooves 13, and the relief grooves 13 provide installation space for the baffle 3 and the arc blocking plate 4;

[0028] It is worth mentioning that the cover plate 2 is provided with a slot 21, and the slot 21 forms a relatively sealed space between the baffle 3, the arc blocking plate 4 and the cover plate 2 to prevent the arc flash from flying out from the gap between the baffle 3, the arc blocking plate 4 and the cover plate 2;

[0029] It is worth mentioning that on both sides of the baffle 3 and the arc blocking plate 4, there are extensions 5, which are inserted into the relief grooves 13. On the tops of the baffle 3 and the arc blocking plate 4, there are fixing parts 6, which are inserted into the slots 21. The extensions 5 cooperate with the relief grooves 13 to provide strong support for the baffle 3 and the arc blocking plate 4, and the fixing parts 6 are used in cooperation with the slots 21;

[0030] It is worth mentioning that a distance allowing the tightening screw of the terminal 12 to move up and down is maintained between the channel 41 and the terminal 12. The channel 41 is provided with a plurality of avoidance grooves 411 for accommodating the first retardation plates 42 and the second retardation plates 43, and the avoidance grooves 411 provide accommodation space and support points for the first retardation plates 42 and the second retardation plates 43;

[0031] It is worth mentioning that the top sides of the first retarder plate 42 and the second retarder plate 43 are provided with limiting parts 45, which abut against the outer wall of the channel 41. The two sides of the first retarder plate 42 and the second retarder plate 43 are provided with bumps 46, which abut against the side walls of the avoidance groove 411. The limiting parts 45 limit the depth of insertion of the first retarder plate 42 and the second retarder plate 43 into the avoidance groove 411. Through the bumps 46, the first retarder plate 42 and the second retarder plate 43 are connected and fixed to the avoidance groove 411 in an interference fit manner.

[0032] Through the above design scheme, the product can achieve the advantages of pressure relief effect and zero arcing.

[0033] The above content further elaborates on the present utility model in combination with specific embodiments. It cannot be determined that the specific implementation of the present utility model is only limited to these descriptions. For those of ordinary skill in the technical field to which the present utility model belongs, without departing from the concept of the present utility model, several simple deductions or substitutions can still be made, which should all be regarded as belonging to the protection scope determined by the claims submitted for the present utility model.

Claims

1. A molded case circuit breaker with a pressure relief function, comprising a housing (1) and a cover plate (2) covering the housing (1), wherein the housing (1) is provided with a plurality of arc extinguishing chambers (11), and is characterized in that: At the entrance of the arc extinguishing chamber (11), a baffle (3) and an arc blocking plate (4) are successively arranged and embedded in the cover plate (2). A terminal (12) is arranged directly in front of the arc blocking plate (4). Inclined downward channels (41) are arranged on both sides of the arc blocking plate (4), and the channels (41) are attached to both sides of the terminal (12). A number of equally spaced first retardation plates (42) are inserted in the channels (41). A second retardation plate (43) is arranged between the first retardation plates (42). A number of pressure relief holes (44) are provided on the first retardation plates (42) and the second retardation plates (43). The pressure relief holes (44) of the first retardation plates (42) and the pressure relief holes (44) of the second retardation plates (43) are arranged in a staggered manner. A number of through holes (31) are provided on the baffle (3) and arranged at the entrance of the channels (41).

2. The molded case circuit breaker with a pressure relief function according to claim 1, characterized in that: Relief grooves (13) are arranged on both sides at the entrance of the arc extinguishing chamber (11).

3. The molded case circuit breaker with a pressure relief function according to claim 2, characterized in that: The cover plate (2) is provided with a slot (21).

4. The molded case circuit breaker with a pressure relief function according to claim 3, characterized in that: Extension parts (5) are arranged on both sides of the baffle (3) and the arc blocking plate (4) and inserted in the relief grooves (13). Fixing parts (6) are arranged on the tops of the baffle (3) and the arc blocking plate (4) and inserted in the slot (21).

5. The molded case circuit breaker with a pressure relief function according to claim 4, characterized in that: A distance allowing the tightening screw of the terminal (12) to move up and down is maintained between the channel (41) and the terminal (12). A number of avoidance grooves (411) for accommodating the first retardation plates (42) and the second retardation plates (43) are provided in the channel (41).

6. The molded case circuit breaker with a pressure relief function according to claim 5, characterized in that: Limiting parts (45) are arranged on both sides at the tops of the first retardation plates (42) and the second retardation plates (43) and abut against the outer wall of the channel (41). Protrusions (46) are arranged on both sides of the first retardation plates (42) and the second retardation plates (43) and abut against the side walls of the avoidance grooves (411).

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