Circuit breaker structure

Abstract

The utility model discloses a circuit breaker structure, and relates to the field of circuit breakers. According to the specific implementation scheme, the circuit breaker comprises a circuit breaker shell; an arc extinguishing chamber and an arc extinguishing chamber are arranged in the circuit breaker shell, the arc extinguishing chamber is provided with a boss used for rebounding an arc, the arc extinguishing chamber is further provided with an arc outlet, an arc extinguishing net is arranged at the arc outlet, an arc extinguishing chamber body and an arc running channel are arranged in the arc extinguishing chamber, the arc extinguishing chamber body is arranged on one side of the arc extinguishing chamber, and the arc running channel is arranged on the other side of the arc extinguishing chamber. The arc running channel is connected with the arc extinguishing chamber body, and the arc running channel is arranged on one side, far away from the arc extinguishing chamber, of the arc extinguishing chamber body. According to the utility model, the plurality of V-shaped or herringbone bosses are arranged, so that rebounded current impacts the side walls of the bosses to be rebounded, the rebounded current cannot run back to the arc extinguish chamber body, and the phenomenon of back breakdown of an electric arc cannot be caused again.

Description

TECHNICAL FIELD

[0001] The utility model relates to circuit breaker technical field especially relates to a circuit breaker structure. BACKGROUND

[0002] The existing circuit breaker in the breaking action process, the voltage between the moving contact and the static contact will cause air medium discharge, forms the electric arc, through the arc -striking piece and the magnetic blow effect will electric arc be introduced into the arc extinguishing chamber in the circuit breaker and play the arc extinguishing effect, utilize the arc extinguishing piece in the arc extinguishing chamber to cut electric arc and absorb energy, extinguish electric arc eventually. However, in the circuit breaker breaking, the arc behind breaks down, the arc reignites, leading to breaking test failure. SUMMARY

[0003] Therefore, the utility model discloses a circuit breaker structure to solve the problem of arc reigniting in the circuit breaker breaking, leading to breaking test failure.

[0004] The utility model provides a circuit breaker structure, it includes: circuit breaker shell,

[0005] The arc extinguishing chamber and the arc extinguishing chamber are arranged in the circuit breaker shell, the arc extinguishing chamber is provided with the boss for rebounding electric arc, the arc extinguishing chamber is also provided with the electric arc export, and the arc extinguishing net is arranged at the electric arc export, the arc extinguishing chamber body and the arc running channel are arranged in the arc extinguishing chamber, the arc extinguishing chamber body is arranged in one side of the arc extinguishing chamber, the arc running channel is connected with the arc extinguishing chamber body, and the arc running channel is arranged in one side of the arc extinguishing chamber body away from the arc extinguishing chamber.

[0006] The boss is provided with multiple, and the boss is in " V " type or herringbone.

[0007] The electric arc export is provided with multiple, and the slot is arranged at each electric arc export.

[0008] The arc extinguishing net is arranged in the slot.

[0009] The arc extinguishing net includes multiple layers of arc extinguishing net sheets, and the mesh of the arc extinguishing net sheet close to the arc extinguishing chamber is greater than the arc extinguishing net sheet away from the arc extinguishing chamber.

[0010] The moving contact mechanism is arranged in the rotating shaft in the circuit breaker shell, and the moving contact mechanism includes the moving contact base and the moving contact, the moving contact base is sleeved on the rotating shaft, and the moving contact is connected with the moving contact base.

[0011] The circuit breaker shell is also provided with the static contact, and the static contact is installed in one side of the arc running channel away from the arc extinguishing chamber.

[0012] The circuit breaker shell adopts the plug-in structure.

[0013] Beneficial effects: the utility model discloses a plurality of " V " type or herringbone boss is set to make the current rebounding impact to the boss side wall and be bounced, make it unable to run back arc chamber body, will not cause the phenomenon of arc back breakdown again.

[0014] By setting the arc extinguishing net, the free arc can be arc extinguishing, the arc extinguishing net is designed as multilayer arc extinguishing net piece, and the residual arc can be gradually arc extinguished while the metal particles carried in the arc are isolated.

[0015] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the utility model, and is not used to limit the scope of the utility model. Other features of the utility model will become easy to understand through the following description. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings are used to better understand the scheme, and do not constitute the limitation of the utility model. Among them:

[0017] Figure 1 It is the internal structure schematic view of the circuit breaker shell provided by the utility model;

[0018] Figure 2 It is the arc flow direction schematic view provided by the utility model;

[0019] Figure 3 It is the schematic view of the plug-in structure provided by the utility model;

[0020] Figure 4 It is the arc extinguishing net and arc outlet schematic view provided by the utility model. DETAILED DESCRIPTION

[0021] The exemplary embodiments of the utility model are described below in conjunction with the drawings, including various details of the embodiments of the utility model to help understanding, and they should be considered only as exemplary. Therefore, those skilled in the art should realize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the utility model. Similarly, in order to be clear and concise, the description is omitted in the following description.

[0022] As Figure 1 Indicated, the utility model provides a kind of circuit breaker structure, comprising:

[0023] The circuit breaker housing 1 is provided with an arc extinguishing chamber 2 and an arc extinguishing chamber 3, the arc extinguishing chamber 3 is provided with a boss 31 for rebounding arc, the arc extinguishing chamber 3 is also provided with an arc outlet 7, the arc outlet 7 is provided with an arc extinguishing grid 6, the arc extinguishing chamber 2 is provided with an arc extinguishing chamber body 21 and an arc running channel 22, the arc extinguishing chamber body 21 is arranged on one side of the arc extinguishing chamber 3, the arc running channel 22 is connected with the arc extinguishing chamber body 21, and the arc running channel 22 is arranged on the side of the arc extinguishing chamber body 21 away from the arc extinguishing chamber 3.

[0024] As shown in the figure, the arc extinguishing chamber 3 is provided with an arc outlet 7 matched with the arc extinguishing grid 6, which can further weaken the energy of the arc when the arc is about to leave the arc extinguishing chamber 3, and prevent the arc from returning to the circuit to cause damage. Figure 4

[0025] When an overload or short circuit occurs in the circuit, the current will increase sharply. When the electromagnetic release detects that the current exceeds the set value, an electromagnetic force is generated to push the release lever to separate the contacts and cut off the circuit. At the same time, the thermal release lever is also deformed due to the heat generated by the current, further ensuring the separation of the moving contact 43 and the static contact 5. After the moving contact 43 and the static contact 5 are separated, an arc is formed between the contacts. The arc enters the arc extinguishing chamber body 21 through the arc running channel 22, and is rapidly cooled and decomposed in the arc extinguishing chamber body 21, and finally extinguished. However, part of the arc has not been extinguished, and when the part of the arc collides with the inner wall of the circuit breaker and rebounds, the arc changes direction and runs back to the arc extinguishing chamber body 21, causing circuit failure and damage.

[0026] The boss 31 is provided with a plurality of "V" shaped or inverted V shaped bosses.

[0027] The arc outlet 7 is provided with a plurality of arc outlets 7, and each arc outlet 7 is provided with a slot 8.

[0028] The boss 31 provided in the arc extinguishing chamber 3 helps to guide the change of the arc movement direction, prolongs the arc path length, and thus increases the arc cooling time, so that the arc is more easily extinguished.

[0029] When the inner wall of the circuit breaker collides and rebounds, the arc changes direction and meets the "V" shaped or inverted V shaped boss 31. Since the two side walls of the boss 31 are "V" shaped or inverted V shaped, the arc collides with the side wall of the boss 31 and changes direction again, guiding the arc to move towards the arc outlet 7.

[0030] The utility model is provided with a plurality of "V" shaped or inverted V shaped bosses 31, which is to prevent the occurrence of back breakdown of the arc.

[0031] ​As shown in FIG. 2, the arrows represent the flow direction of the arc when the circuit breaker is tripped, and the dotted arrows represent the flow direction of the rebounding arc after the arc hits the inner wall of the circuit breaker, and the rebounding current hits the side wall of the boss 31 and is rebounded, so that the arc cannot run back to the arc extinguishing chamber body 21 and cannot cause the phenomenon of arc back breakdown again, thereby greatly improving the breaking performance of the circuit breaker.

[0032] The arc extinguishing grid 6 is arranged in the slot 8.

[0033] The arc extinguishing grid 6 is designed with the slot 8, and both ends of the slot 8 are the housings of the circuit breaker, so that the assembly is more simple, and the installation is completed by directly inserting the arc extinguishing grid 6 into the slot 8.

[0034] The arc extinguishing grid 6 includes multiple layers of arc extinguishing grid sheets, and the mesh of the arc extinguishing grid sheet close to the arc extinguishing chamber 3 is larger than that of the arc extinguishing grid sheet far from the arc extinguishing chamber 3.

[0035] The arc outlet 7 of the arc extinguishing chamber 3 is used in cooperation with the arc extinguishing grid 6, which can further weaken the energy of the arc when the arc is about to leave the arc extinguishing chamber 3, so as to prevent the arc from returning to the circuit and causing harm.

[0036] By arranging the arc extinguishing grid 6, the free arc can be extinguished, and the arc extinguishing grid 6 is designed as multiple layers of arc extinguishing grid sheets, and the mesh of the arc extinguishing grid sheet is getting smaller and smaller, the mesh of the arc extinguishing grid sheet through which the arc passes first is the largest, and the mesh of the arc extinguishing grid sheet through which the arc passes last is the smallest. Since the arc carries hot metal particles during movement, when the arc contacts the arc extinguishing grid sheet with the largest mesh, the large-particle metal particles are isolated, and when the arc passes through the arc extinguishing grid sheet with the small mesh, the small-particle metal particles are isolated. At the same time, the residual arc is gradually extinguished by passing through multiple layers of arc extinguishing grid sheets.

[0037] The circuit breaker housing 1 is provided with a movable contact mechanism 4, the movable contact mechanism 4 is arranged on a rotating shaft 41 in the circuit breaker housing 1, the movable contact mechanism 4 includes a movable contact base 42 and a movable contact 43, the movable contact base 42 is sleeved on the rotating shaft 41, and the movable contact 43 is connected with the movable contact base 42.

[0038] The circuit breaker housing 1 is also provided with a static contact 5, and the static contact 5 is installed on the side of the arc running channel 22 away from the arc extinguishing chamber 2.

[0039] The movable contact 43 and the static contact 5 jointly constitute a contact system for opening and closing the circuit, when the circuit works normally, the current passes through the movable contact 43 and the static contact 5, and the circuit is in a closed state, at this time, the electromagnetic release and the thermal release pull rod are in an untriggered state.

[0040] When the circuit is overloaded or short-circuited, the current increases sharply, and the electromagnetic trip detects that the current exceeds the set value, and generates an electromagnetic force to push the thermal trip lever, so that the movable contact 43 and the static contact 5 are separated, and the circuit is cut off, at the same time, the thermal trip lever is deformed due to the heat generated by the current, further ensuring that the movable contact 43 and the static contact 5 are separated.

[0041] When the circuit needs to be reset, manual reset can be performed, and the movable contact 43 and the static contact 5 are restored to the closed state by operating the handle.

[0042] In addition, the movable contact 43 and the static contact 5 can be closed or opened by operating the operating rod.

[0043] The circuit breaker housing 1 adopts a plug-in structure.

[0044] As shown in Figure 3 The circuit breaker housing 1 adopts a plug-in structure to avoid the arc outlet 7, so that the arc can be guided out of the arc chamber 3.

[0045] The utility model discloses a plurality of " V " type or herringbone boss 31 is set up to make the current rebounding hit to the boss 31 side wall and be bounced back, make it unable to run back to the arc chamber body 21, will not cause the phenomenon of arc back breakdown again.

[0046] The utility model discloses a plurality of " V " type or herringbone boss 31 is set up to make the current rebounding hit to the boss 31 side wall and be bounced back, make it unable to run back to the arc chamber body 21, will not cause the phenomenon of arc back breakdown again.

[0047] The above is only the specific implementation manner of the utility model, but the protection scope of the utility model is not limited to this, any change or replacement in the technical range disclosed by the utility model should be covered in the protection scope of the utility model. Therefore, the protection scope of the utility model should be limited to the protection scope of the claims.

Claims

1. A circuit breaker structure, characterized by, The circuit breaker shell is characterized in that: the circuit breaker shell is internally provided with an arc extinguishing chamber and an arc eliminating chamber, the arc eliminating chamber is provided with a boss for rebounding arc, the arc eliminating chamber is further provided with an arc outlet, the arc outlet is provided with an arc eliminating net, the arc extinguishing chamber is internally provided with an arc extinguishing chamber body and an arc running channel, the arc extinguishing chamber body is arranged on one side of the arc eliminating chamber, the arc running channel is connected with the arc extinguishing chamber body, and the arc running channel is arranged on the side of the arc extinguishing chamber body away from the arc eliminating chamber.

2. The circuit breaker structure of claim 1, wherein: The boss is provided with a plurality of "V" or inverted V shapes.

3. The circuit breaker structure of claim 2, wherein: The arc outlet is provided with a plurality of arc outlets, and each arc outlet is provided with a slot.

4. The circuit breaker structure of claim 3, wherein: The arc eliminating net is arranged in the slot.

5. The circuit breaker structure of claim 4, wherein: The arc eliminating net comprises a plurality of layers of arc eliminating net sheets, and the mesh of the arc eliminating net sheet close to the arc eliminating chamber is larger than that of the arc eliminating net sheet away from the arc eliminating chamber.

6. The circuit breaker structure of claim 1, wherein: The circuit breaker shell is internally provided with a movable contact mechanism, the movable contact mechanism is arranged on a rotating shaft in the circuit breaker shell, the movable contact mechanism comprises a movable contact base and a movable contact, the movable contact base is sleeved on the rotating shaft, and the movable contact is connected with the movable contact base.

7. The circuit breaker structure of claim 6, wherein: The circuit breaker shell is further provided with a stationary contact, and the stationary contact is arranged on the side of the arc running channel away from the arc extinguishing chamber.

8. The circuit breaker structure of claim 1, wherein: The circuit breaker shell adopts a plug-in structure.

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