Breaker breaking unit and breaker

Abstract

The utility model relates to a circuit breaker breaking unit and a circuit breaker with the circuit breaker breaking unit. The circuit breaker breaking unit comprises an arc extinguish chamber and an air flow channel (40) located downstream of the arc extinguish chamber, the air flow channel (40) comprises a channel body (41) and one or more backflow prevention portions, the backflow prevention portions are located on the sides of the channel body (41) and communicate with the channel body (41), and the backflow prevention portions are located on the sides of the channel body (41) and communicate with the channel body (41). A backflow prevention protrusion (44) is provided between the backflow prevention portion and the channel body (41) to partially separate the backflow prevention portion from the channel body (41).

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a circuit breaker interrupter unit and a circuit breaker having the same. BACKGROUND

[0002] Circuit breakers play a vital role in power systems, as they can cut off the current when an abnormality occurs in the circuit, protecting the circuit and equipment from damage. However, when the circuit is interrupted, the circuit breaker can produce a flying arc phenomenon, which not only damages the busbar and other electrical products in the distribution box, but also can cause serious safety accidents. In order to reduce the safety hazards caused by flying arc, a terminal cover is usually installed at the exhaust port of the circuit breaker, but this approach increases the overall size of the circuit breaker.

[0003] In addition, in order to integrate more circuit breakers in the distribution box, the requirements for the size of the circuit breaker are constantly increasing in the energy storage and other industries, and smaller product size means higher market competitiveness. While pursuing the utilization rate of the internal space of the circuit breaker, ensuring the installation and fixation of the interrupter unit and improving the dielectric performance of the circuit breaker become key challenges in design. These factors not only relate to the performance and safety of the circuit breaker, but also are important considerations for the miniaturization and integration of the circuit breaker. Therefore, how to realize the miniaturization of the circuit breaker while ensuring safety is also an important technical problem faced by the current circuit breaker design and manufacturing field. SUMMARY

[0004] In view of the above-mentioned problems and needs, the present disclosure provides a circuit breaker interrupter unit and a circuit breaker having the same, which solves the above-mentioned problems and brings other technical effects due to the adoption of the following technical features.

[0005] In one aspect, the present disclosure provides a circuit breaker interrupter unit, which comprises an arc-extinguishing chamber and a gas flow channel downstream of the arc-extinguishing chamber, the gas flow channel comprising a channel body and one or more backflow prevention portions, the backflow prevention portions being located on the side of the channel body, communicating with the channel body, and wherein a backflow prevention portion is provided between the backflow prevention portion and the channel body to partially separate the backflow prevention portion from the channel body.

[0006] According to a preferred scheme, the backflow prevention protrusion has a guide surface extending at an acute angle with respect to the direction of gas flow.

[0007] According to a preferred scheme, the gas flow channel is formed in a unit housing of the circuit breaker interrupter unit.

[0008] According to a preferred scheme, the circuit breaker comprises a first backflow prevention portion and a second backflow prevention portion spaced apart in the direction of gas flow.

[0009] According to a preferred arrangement, the first anti-backflow portion and the second anti-backflow portion are located on either side of the gas flow passage.

[0010] According to a preferred arrangement, the gas flow passage is provided with a foam nickel.

[0011] According to a preferred arrangement, the foam nickel is provided within a widened portion of the gas flow passage.

[0012] According to a preferred arrangement, the foam nickel is provided downstream of the anti-backflow portion.

[0013] According to a preferred arrangement, the circuit breaker interrupter unit has a unit housing comprising a first housing portion and a second housing portion which are mated together to define an internal cavity.

[0014] According to a preferred arrangement, the first housing portion and the second housing portion are mated together by mating protrusions and mating recesses which are complementary to each other.

[0015] The most preferred embodiments implementing the present disclosure will be described in greater detail below with reference to the accompanying drawings, so that the features and advantages of the present disclosure can be easily understood. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments of the present disclosure will be briefly introduced below. The drawings merely serve to show some embodiments of the present disclosure, and not to limit the entire embodiments of the present disclosure to this.

[0017] Figure 1 A cross-sectional view of a circuit breaker interrupter unit according to the present disclosure is shown;

[0018] Figure 2 A cross-sectional view of a circuit breaker interrupter unit according to the present disclosure is shown from another perspective;

[0019] Figure 3 A first housing portion of a unit housing of a circuit breaker interrupter unit according to the present disclosure is shown;

[0020] Figure 4 A base of a circuit breaker according to the present disclosure is shown;

[0021] Figure 5 A mating relationship of a first housing portion and a second housing portion of a unit housing of a circuit breaker interrupter unit according to the present disclosure is shown;

[0022] Figure 6 A state in which one of the circuit breaker interrupter units is installed in the base is shown;

[0023] Figure 7 An enlarged view of a gas flow passage according to the present disclosure is shown.

[0024] List of reference signs

[0025] 10 stationary contact

[0026] 20 movable contact

[0027] 30 arc chamber

[0028] 31 arc plate

[0029] 32 exhaust port

[0030] 40 gas flow channel

[0031] 41 channel body

[0032] 42 first backflow prevention portion

[0033] 43 second backflow prevention portion

[0034] 44 backflow prevention protrusion

[0035] 45 guide surface

[0036] 46 foamed nickel

[0037] 47 widened portion

[0038] 50 unit housing

[0039] 51 first housing portion

[0040] 511 mating groove

[0041] 512 first bottom protrusion

[0042] 52 second housing portion

[0043] 521 mating protrusion

[0044] 522 second bottom protrusion

[0045] 53 bottom protrusion

[0046] 60 base

[0047] 61 accommodation portion

[0048] 62 bottom recess DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solutions and advantages of the technical solutions of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be described clearly and completely below in combination with the drawings of the embodiments of the present disclosure. The same reference signs in the drawings represent the same components. It should be noted that the described embodiments are part of the embodiments of the present disclosure, rather than all the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present disclosure.

[0050] Compared with the embodiments shown in the drawings, the feasible implementation solutions within the protection scope of the present disclosure can have fewer components, other components not shown in the drawings, different components, differently arranged components or differently connected components, etc. In addition, two or more components in the drawings can be implemented in a single component, or a single component shown in the drawings can be implemented as a plurality of separate components.

[0051] Unless otherwise defined, the technical terms or scientific terms used herein should be understood as the usual meanings understood by those of ordinary skill in the art to which the present disclosure belongs. The terms "first", "second" and similar words used in the specification and claims of the present patent application do not represent any order, quantity or importance, but are only used to distinguish different components. Similarly, "one" or "a" and similar words do not necessarily represent a quantity limitation. The terms "including", "containing" and similar words mean that the elements or objects before the words cover the elements or objects listed after the words and their equivalents, without excluding other elements or objects. The terms "connected" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to represent relative positional relationships, which may

[0052] The present disclosure relates to a circuit breaker breaking unit and a circuit breaker having the same.

[0053] The circuit breaker breaking unit proposed by the present disclosure comprises a static contact 10 as a core component and a moving contact 20 cooperating with the static contact 10, and the static and moving contacts 10 work together to control the on-off of an electric circuit. When the on-off occurs, the static contact 10 is fixed, while the moving contact 20 moves relative to the static contact 10, for example, the moving contact 20 can rotate around its own rotation axis to engage or leave the static contact 10, thereby realizing the connection or disconnection of the electric circuit. Among them Figure 1 The moving contact 20 and the static contact 10 are shown in the disconnected state. During the separation of the moving contact 20 and the static contact 10, an arc is easily generated between them, which brings safety hazards.

[0054] The breaker breaking unit of the present disclosure further comprises an arc extinguishing chamber 30. The arc extinguishing chamber 30 has a plurality of arc extinguishing pieces 31, each of which can have the same or substantially the same size and shape. Among them, each arc extinguishing piece 31 is spaced apart from each other along the height direction of the arc extinguishing structure, preferably at a uniform distance. The arc extinguishing chamber 30 can include a first insulating side plate and a second insulating side plate arranged side by side between the front end and the rear end thereof, so as to hold the plurality of arc extinguishing pieces 31 by the first and second insulating side plates. The arc extinguishing chamber 30 has a front end close to the arc occurrence area and a rear end away from the arc occurrence area, and the arc and high-temperature gas can enter the inside of the arc extinguishing chamber 30 from the front end of the arc extinguishing chamber 30 in the direction from right to left in the figure. The rear of the rear end of the arc extinguishing chamber 30 is the wall of the unit housing, and the gas flow out of the rear end of the arc extinguishing chamber 30 can flow out of the exhaust port 32 provided on the wall of the unit housing. As Figure 1 shown, the exhaust port 32 is located near the bottom of the arc extinguishing chamber 30. In the conventional practice, a terminal cover will be installed behind the exhaust port 32, but this will increase the overall size of the circuit breaker. In view of this, the present disclosure designs a gas flow channel downstream of the arc extinguishing chamber 30, which has a certain length, which can be greater than the height of the arc extinguishing chamber 30. As the charged gas advances in the gas flow channel, its charged particles are gradually consumed.

[0055] The structure and features of the gas flow channel 40 of the present disclosure will be described below in conjunction with the preferred embodiments shown in Figures 1-2 and Figure 7

[0056] The gas flow channel 40 communicates with the exhaust port described above and is formed downstream thereof. The gas flow channel 40 has a channel inlet and a channel outlet. The channel inlet is connected to the exhaust port, and the channel outlet communicates to the outside environment of the unit housing 50. The gas flow channel 40 generally forms two distinct bends, which is more conducive to dissipating charged particles.

[0057] For various reasons, such as the obstruction of the channel wall at the bend, the gas flow can backflow during the process of advancing along the gas flow channel 40. In order to prevent backflow, the present disclosure proposes to provide an anti-backflow portion on one side or both sides of the channel main body 41 of the gas flow channel 40. The gas flow channel 40 can have one or more anti-backflow portions, which communicate with the channel main body 41, and an anti-backflow protrusion (44) is provided between the anti-backflow portion and the channel main body 41 to partially separate the anti-backflow portion from the channel main body 41. The anti-backflow portion forms an additional gas flow containing area extending from the channel main body 41, and this area forms a relatively independent local space due to the partial separation from the channel main body 41 by the anti-backflow protrusion 44, and the backflowing gas will form a swirling flow in this local space, as Figure 7 ​As indicated by the middle arrow, the anti-backflow design prevents significant backflow in the main channel 41, allowing for smoother gas discharge.

[0058] The backflow prevention protrusion 44 between the airflow channel 40 and the backflow prevention section can be a "barb"-like structure formed on the channel wall. Preferably, the backflow prevention protrusion 44 has a guide surface 45, which extends at an acute angle relative to the airflow direction. The gas swirling in the backflow prevention section can eventually return to the channel body 41 via the guide surface 45.

[0059] Preferably, the airflow channel 40 is directly formed in the unit housing 50 of the circuit breaker breaking unit. Specifically, the airflow channel 40 can be formed by providing grooves in the unit housing 50. Directly forming the airflow channel 40 in the unit housing 50 of the circuit breaker breaking unit can reduce the overall size of the circuit breaker breaking unit. In the preferred embodiment shown in the drawings, the unit housing 50 is formed by the mating of a first housing portion 51 and a second housing portion 52. A groove may be provided on each of the first housing portion 51 and the second housing portion 52. When the first housing portion 51 and the second housing portion 52 are mated together, the two grooves also mate together, forming a complete airflow channel 40.

[0060] like Figures 1-2 As shown, the circuit breaker preferably includes a first backflow prevention section 42 and a second backflow prevention section 43 spaced apart in the airflow direction. Furthermore, the first backflow prevention section 42 and the second backflow prevention section 43 are preferably located on opposite sides of the airflow channel 40. This arrangement can further improve the backflow prevention effect.

[0061] Of course, the first anti-backflow section 42 and the second anti-backflow section 43 can also be arranged at the same position in the airflow direction, located on both sides of the airflow channel 40.

[0062] Furthermore, although the embodiment shown in the accompanying drawings includes two backflow prevention sections, in other embodiments not shown, the circuit breaker may include only one backflow prevention section, or three or more backflow prevention sections. If there are three or more backflow prevention sections, it is preferable that each side of the gas flow path is provided with a backflow prevention section.

[0063] According to the preferred embodiment, nickel foam 46 is provided in the airflow channel 40. Nickel foam 46 can adsorb electric arcs and filter metal particles in the gas, preventing metal particles from being ejected from the gas flow channel and posing a potential hazard. The airflow channel 40 itself has an arc-extinguishing effect, and the combination of the airflow channel 40 and nickel foam 46 further enhances the arc-extinguishing effect, significantly increasing the safety of the circuit breaker product.

[0064] Preferably, the foamed nickel 46 is arranged downstream of the anti-backflow portion, in particular at or near the outlet of the gas flow channel 40, to improve the overall arc extinguishing effect. In addition, preferably, the foamed nickel 46 is arranged within a widened portion 47 of the gas flow channel 40. The widened portion 47 has a width larger than the width of the channel body 41. By the widened portion 47, more foamed nickel 46 can be provided to improve the arc extinguishing effect. As Figure 2 shown, the widened portion 47 can have a cuboid structure. It is to be understood, however, that in embodiments not shown, the widened portion 47 can be omitted and the foamed nickel 46 can be arranged directly in the gas flow channel 40, even in the narrowed portion of the gas flow channel 40.

[0065] With the embodiments of the arc flying gas channel shown in the drawings of the present disclosure, the terminal cover can be omitted, and when the breaking capacity of the circuit breaker is not higher than 5 kA, the effect of zero arc flying can be achieved.

[0066] The present disclosure also improves the unit housing 50 of the circuit breaker segment unit and the base 60 accommodating the circuit breaker segment unit, while achieving the effects of effectively reducing the internal pollution of the circuit breaker after short-circuit breaking test, improving the internal dielectric performance of the circuit breaker after test, facilitating the positioning and installation of the circuit breaker breaking unit, and improving the structural strength of the breaking unit. The following will mainly refer to Figures 3-6 for a detailed description. Among them, Figure 4 the base 60 accommodating the circuit breaker breaking unit is shown, Figure 5 the cooperation relationship between the first housing portion 51 and the second housing portion 52 of the unit housing 50 is shown, Figure 6 the state in which one of the circuit breaker breaking units is installed in the base 60 is shown.

[0067] As Figure 5 , 6 shown, the unit housing 50 of the circuit breaker segment unit includes a first housing portion 51 and a second housing portion 52, which are butted against each other to define an internal cavity, in which the arc extinguishing chamber, the moving contact and the stationary contact are accommodated. Among them, Figure 3 a schematic view of the second housing portion 52 is shown, and the first housing portion 51 can have substantially the same profile as the second housing portion 52.

[0068] Preferably, the first housing portion 51 and the second housing portion 52 are butted together by complementary mating protrusions 521 and mating recesses 511. As Figure 5 shown, when the first housing portion 51 and the second housing portion 52 are butted together, the mating protrusions 521 are accommodated in the mating recesses 511. The mating protrusions 521 and the mating recesses 511 are preferably arranged near the edges of the respective housing portions.

[0069] The arrangement of the matching protrusions 521 and the matching recesses 511 makes it difficult for contaminants (e.g. conductive black carbide) generated during the circuit breaker test to pass through the gap between the first and second housing parts, thereby effectively reducing the contamination inside the circuit breaker after the short-circuit breaking test and improving the dielectric performance of the circuit breaker. In addition, the matching protrusions 521 and the matching recesses 511 also make the abutting surface between the two housing parts change from a flat surface to a serpentine shape. When the circuit breaker is a two-pole or more circuit breaker, the inter-pole creepage distance can be increased without increasing the distance between the two poles or the thickness of the housing, further improving the dielectric performance and safety of the circuit breaker.

[0070] In addition, the two housing parts are joined together by the matching protrusions 521 and the matching recesses 511, which facilitates the assembly of the two housing parts. Moreover, when the short-circuit breaking test is performed and the pressure inside the breaking unit is high, the unit housing 50 can be slightly deformed. The matching protrusions 521 and the matching recesses 511 not only stabilize the breaking unit, but also share a portion of the bolt stress on the unit housing 50.

[0071] Preferably, as shown in Figure 4 , 6 The bottom wall of the accommodation portion 61 is provided with a bottom recess 62 for accommodating the bottom protrusion 53 of the unit housing 50 of each circuit breaker breaking unit. The bottom recess 62 can be in the form of an elongated groove. Alternatively, the bottom recess 62 can include a plurality of shorter grooves. The bottom protrusion 53 of the unit housing 50 has a shape matching that of the bottom recess 62. The design of the bottom protrusion 53 and the bottom recess 62 facilitates the positioning and installation of the circuit breaker breaking unit in the base 60 in a simple manner.

[0072] Preferably, as shown in Figure 5 The first housing part 51 includes a first bottom protrusion 512, and the second housing part 52 includes a second bottom protrusion 522, which together form the bottom protrusion 53.

[0073] In the preferred embodiment shown in the drawings, the base 60 has two accommodation portions 61 for accommodating two segmented units, thereby forming a two-pole circuit breaker. In an embodiment not shown, there can be other numbers of accommodation portions 61, such as one, three, or four accommodation portions 61, to form a single-pole, three-pole, or four-pole circuit breaker.

[0074] The exemplary implementation of the scheme proposed by the present disclosure is described in detail above with reference to the preferred embodiments, however, it can be understood by those skilled in the art that various modifications and changes can be made to the above specific embodiments, and various technical features and structures proposed by the present disclosure can be combined without departing from the concept of the present disclosure, and the protection scope of the present disclosure is determined by the appended claims.

Claims

1. A circuit breaker interrupter unit, comprising: comprising: an arc chute (30); a gas flow channel (40) downstream of the arc chute, the gas flow channel (40) comprising a channel body (41) and one or more backflow prevention portions, the backflow prevention portions being located at the sides of the channel body (41), communicating with the channel body (41), and wherein a backflow prevention protrusion (44) is provided between the backflow prevention portions and the channel body (41) to partially separate the backflow prevention portions from the channel body (41).

2. The circuit breaker interrupter unit of claim 1, wherein the backflow prevention protrusion (44) has a guide surface (45) extending at an acute angle with respect to the direction of gas flow.

3. The circuit breaker interrupter unit of claim 1, wherein the gas flow channel (40) is formed in a unit housing (50) of the circuit breaker interrupter unit.

4. The circuit breaker interrupter unit of claim 1, wherein the circuit breaker comprises a first backflow prevention portion (42) and a second backflow prevention portion (43) spaced apart in the direction of gas flow.

5. The circuit breaker interrupter unit of claim 4, wherein the first backflow prevention portion (42) and the second backflow prevention portion (43) are located on either side of the gas flow channel (40).

6. The circuit breaker interrupter unit of claim 1, wherein a foamed nickel (46) is provided in the gas flow channel (40).

7. The circuit breaker interrupter unit of claim 6, wherein the foamed nickel (46) is provided within a widened portion (47) in the gas flow channel (40).

8. The circuit breaker interrupter unit of claim 6, wherein the foamed nickel (46) is provided downstream of the backflow prevention portions.

9. The circuit breaker interrupter unit of claim 1, wherein the circuit breaker interrupter unit has a unit housing (50) comprising a first housing portion (51) and a second housing portion (52) which are brought together to define an internal cavity.

10. The circuit breaker interrupter unit of claim 9, wherein the first housing portion (51) and the second housing portion (52) are brought together by mating protrusions (521) and mating recesses (511) which are complementary to each other.

11. A circuit breaker characterized by, a base (60) having one or more receptacles (61), each receptacle (61) accommodating a circuit breaker interrupter unit as claimed in any one of claims 1 to 10.

12. The circuit breaker of claim 11, wherein a bottom recess (62) is provided in the bottom wall of the receptacle (61) and the bottom of the unit housing (50) of each circuit breaker interrupter unit is provided with a bottom protrusion (53) which is accommodated in the bottom recess (62).

13. The circuit breaker of claim 12, wherein The unit housing (50) comprises a first housing part (51) and a second housing part (52) which are butted against each other to define an internal cavity, the first housing part (51) comprising a first bottom protrusion (512), the second housing part (52) comprising a second bottom protrusion (522), the first bottom protrusion (512) and the second bottom protrusion (522) jointly forming the bottom protrusion (53).

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