Arc extinguishing device and switching device

Abstract

The invention discloses an arc extinguishing device and a switching device, which are used for extinguishing an arc generated when a moving contact and a static contact are disconnected, an arc extinguishing space is arranged in the arc extinguishing device, one side, corresponding to the static contact, of the arc extinguishing space is defined as a front side direction, and one side, far away from the static contact, of the arc extinguishing space is defined as a rear side direction. The moving contact and the static contact are configured to be in a closed state at the front side of the arc extinguishing space, the moving contact swings towards the rear side of the arc extinguishing space so as to form a breaking state with the static contact, a first arc extinguishing grid sheet group is arranged in the arc extinguishing space along the front-back direction, and a second arc extinguishing grid sheet group is arranged at the rear side of the arc extinguishing space. According to the arc extinguishing device, the second arc extinguishing grid piece set located on the rear side of the arc extinguishing space is additionally arranged on the basis of the first arc extinguishing grid piece set, the second arc extinguishing grid piece set plays an effective cutting and arc extinguishing role on the electric arc on one side of the breaking position of the moving contact, and therefore the overall arc extinguishing effect of the arc extinguishing device is improved, and the arc extinguishing device can be better applied to the UL standard.

Description

Technical Field

[0001] This invention relates to the field of switching electrical equipment technology, specifically to an arc extinguishing device and a switching electrical equipment. Background Technology

[0002] In existing switching devices such as circuit breakers, several arc-extinguishing plates are typically installed in the arc-extinguishing chamber. These plates are usually arranged at intervals in the same direction as the opening and closing directions of the moving and stationary contacts. Existing circuit breakers are generally used in accordance with IEC standards, with an open-circuit voltage of 1500V. However, when applied to UL standards, the closed-circuit voltage is also considered to be 1500V, and the rated current is 1600A. The voltage difference between the two can reach nearly 200V. Based on these voltage considerations, the arc-extinguishing performance of existing circuit breakers will be subject to higher requirements when applied to UL standards. Therefore, existing circuit breakers may be unable to meet UL standards due to poor arc-extinguishing performance of the arc-extinguishing chamber. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides an arc-extinguishing device, which mainly solves the technical problem of poor arc-extinguishing performance of existing switchgear arc-extinguishing chambers.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solution: An arc-extinguishing device is provided for extinguishing the electric arc generated when the moving contact and the stationary contact are disconnected. An arc-extinguishing space is provided within the arc-extinguishing device. The side of the arc-extinguishing space corresponding to the stationary contact is defined as the front direction, and the side away from the stationary contact is defined as the rear direction. The moving contact and the stationary contact are configured to form a closed state at the front of the arc-extinguishing space. The moving contact swings towards the rear of the arc-extinguishing space and then forms a disconnected state with the stationary contact. A first arc-extinguishing grid plate group is provided in the arc-extinguishing space along the front-rear direction, and a second arc-extinguishing grid plate group is provided at the rear position of the arc-extinguishing space.

[0005] Furthermore, the first arc-extinguishing grid plate group is composed of several first grid plates arranged at intervals along the front-back direction, and the lower end of each first grid plate is inclined forward.

[0006] Furthermore, the upper ends of each first grid plate are arranged at equal or nearly equal intervals, while the lower ends of each first grid plate are tilted forward so that the spacing between adjacent first grid plates is narrower at the bottom and wider at the top, and the upper ends of each first grid plate are arranged in an alternating pattern of high and low.

[0007] Furthermore, the second arc-extinguishing grid plate group is composed of several second grid plates arranged at intervals in the vertical direction, and the front end of each second grid plate is inclined downward.

[0008] Furthermore, the front ends of each second grid are equidistant or substantially equidistant, while the rear ends of each second grid are inclined upwards so that the spacing between adjacent second grids is narrower at the front and wider at the back.

[0009] Furthermore, the arc-extinguishing device also includes a first arc-inducing plate corresponding to the stationary contact and a second arc-inducing plate corresponding to the moving contact, with the second arc-inducing plate located at the bottom of the second arc-extinguishing grid assembly.

[0010] Furthermore, the thickness of the first grid plate located at the foremost position in the first arc-extinguishing grid plate group is configured to be greater than the thickness of the other first grid plates in the first arc-extinguishing grid plate group.

[0011] Furthermore, the arc extinguishing device also includes an arc extinguishing cover, two gas generating baffles, and two arc blocking plates. The two arc blocking plates are arranged opposite each other and spaced apart. The two gas generating baffles are respectively connected to the lower inner side of the two arc blocking plates. The arc extinguishing cover is connected to the upper end of the two arc blocking plates. Several slots are opened on the gas generating baffles. The lower ends of each first grid plate and the second grid plate are respectively engaged in the corresponding slots. The second arc-inducing plate, each first grid plate and the second grid plate are provided with protrusions on both sides. Several holes are opened on the arc blocking plates to engage with each protrusion.

[0012] Furthermore, the second arc-inducing plate includes a fixed section and an extension section. The fixed section has protrusions on both sides, and the fixed section is arranged parallel or substantially parallel to the second grid plate at the lower end of the second arc-extinguishing grid plate group. The extension section is configured to be bent and connected to the fixed section and extend upward at an angle.

[0013] Based on the same inventive concept, the present invention also provides a frame circuit breaker, including a moving contact, a stationary contact and the aforementioned arc extinguishing device, wherein the stationary contact is fixedly disposed at the bottom front side of the arc extinguishing device, the moving contact is disposed correspondingly to the stationary contact, and the moving contact is configured to swing backward relative to the stationary contact to form a break with the stationary contact.

[0014] The above technical solution has the following advantages or beneficial effects:

[0015] In the arc extinguishing device and switching electrical appliance described in this invention, a second arc extinguishing grid group is added to the first arc extinguishing grid group and located at the rear side of the arc extinguishing space. The second arc extinguishing grid group effectively cuts and extinguishes the arc on the side of the moving contact breaking position, thereby improving the overall arc extinguishing effect of the arc extinguishing device. Attached Figure Description

[0016] Figure 1 This is an exploded three-dimensional structural diagram of the arc extinguishing device according to an embodiment of the present invention.

[0017] Figure 2 This is a structural cross-sectional view of the arc-extinguishing device according to an embodiment of the present invention.

[0018] Figure 3 This is a partial structural cross-sectional view of the circuit breaker in the closed state according to an embodiment of the present invention.

[0019] Figure 4 This is a partial structural cross-sectional view of the circuit breaker in the open state according to an embodiment of the present invention.

[0020] Figure 5 This is a schematic diagram of the structure of an arc-extinguishing device for a circuit breaker in the prior art.

[0021] Label Explanation:

[0022] 1. Moving contact; 2. Stationary contact; 3. First grid plate; 4. Second grid plate; 5. First arc-inducing plate; 6. Second arc-inducing plate; 7. Arc-extinguishing hood; 8. Gas-generating baffle; 9. Arc-isolating plate; 10. Flame-extinguishing plate; 11. Arc-extinguishing chamber baffle; 12. Upper baffle; 13. De-idling net; 601. Fixed section; 602. Extension section; 901. Clip hole; 1001. Vent hole; 1002. Front section; 1003. Rear section; 1101. First baffle rib; 1201. Second baffle rib. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0025] Please refer to the appendix. Figure 1 To be continued Figure 4 One embodiment of the present invention provides an arc-extinguishing device for extinguishing the arc generated when the moving contact 1 and the stationary contact 2 are disconnected. An arc-extinguishing space is provided within the device. The side of the arc-extinguishing space corresponding to the stationary contact 2 is defined as the front direction, and the side away from the stationary contact 2 is defined as the rear direction. The moving contact 1 and the stationary contact 2 are configured to form a closed state at the front of the arc-extinguishing space. The moving contact 1 swings towards the rear of the arc-extinguishing space, thus disconnecting from the stationary contact 2. A first arc-extinguishing grid group is provided in the arc-extinguishing space along the front-rear direction, and a second arc-extinguishing grid group is provided at the rear of the arc-extinguishing space. It can be understood that in this embodiment, by adding a second arc-extinguishing grid group located at the rear of the arc-extinguishing space based on the first arc-extinguishing grid group, the second arc-extinguishing grid group effectively cuts and extinguishes the arc on the side where the moving contact 1 is disconnected, thereby improving the overall arc-extinguishing effect of the arc-extinguishing device.

[0026] Please refer to the appendix. Figure 1 To be continued Figure 4 In one preferred embodiment, the first arc-extinguishing grid group is composed of several first grid plates 3 arranged at intervals along the front-back direction, with the lower end of each first grid plate 3 inclined forward. Preferably, in this embodiment, the upper ends of each first grid plate 3 are equidistant or substantially equidistant, while the lower ends of each first grid plate 3 are inclined forward so that the space between adjacent first grid plates 3 is narrower at the bottom and wider at the top, and the upper ends of each first grid plate 3 are arranged in an alternating pattern of high and low. In this embodiment, by setting the lower ends of each first grid plate 3 to be inclined forward and the upper ends of each first grid plate 3 to be equidistant or substantially equidistant, on the one hand, the space between adjacent first grid plates 3 is narrower at the bottom and wider at the top, which is more conducive to the arc within the space moving upward under the blowing action, making it less likely to fall. On the other hand, the forward-inclined lower ends of each first grid plate 3 also better free up the rear side of the arc-extinguishing space, so as to make fuller use of the rear space for installing the second arc-extinguishing grid group. In addition, by configuring the upper part of each first grid plate 3 in an alternating high and low configuration, the ventilation effect is ensured and the problem of arc short circuit is improved to a certain extent.

[0027] Please refer to the appendix. Figure 1 To be continued Figure 4 In one preferred embodiment, the second arc-extinguishing grid group is composed of a plurality of second grid plates 4 arranged at intervals in the vertical direction, and the front end of each second grid plate 4 is inclined downward. In this embodiment, preferably, the front ends of each second grid plate 4 are arranged at equal or substantially equal intervals, while the rear ends of each second grid plate 4 are inclined upward so that the spacing between adjacent second grid plates 4 is narrower at the front and wider at the back.

[0028] Please refer to the appendix. Figure 1 To be continued Figure 4 In one preferred embodiment, the arc-extinguishing device further includes a first arc-inducing plate 5 corresponding to the stationary contact 2 and a second arc-inducing plate 6 corresponding to the moving contact 1, with the second arc-inducing plate 6 located at the bottom of the second arc-extinguishing grid assembly. Further, the thickness of the first grid plate 3 at the foremost position in the first arc-extinguishing grid assembly is configured to be greater than the thickness of the other first grid plates 3 in the first arc-extinguishing grid assembly. In this embodiment, since the first grid plate 3 at the foremost position in the first arc-extinguishing grid assembly is closest to the first arc-inducing plate 5 corresponding to the stationary contact 2, it experiences the greatest electro-repulsive force during operation, making it prone to deformation. Therefore, increasing the thickness of the first grid plate 3 at the foremost position in the first arc-extinguishing grid assembly is beneficial for improving its resistance to deformation and better resisting the electro-repulsive force.

[0029] Please refer to the appendix. Figure 1 To be continued Figure 4In one preferred embodiment, the arc-extinguishing device further includes an arc-extinguishing cover 7, two gas-generating baffles 8, and two arc-blocking plates 9. The two arc-blocking plates 9 are arranged opposite each other at intervals. The two gas-generating baffles 8 are respectively connected to the inner side of the lower end of the two arc-blocking plates 9. The arc-extinguishing cover 7 is connected to the upper end of the two arc-blocking plates 9. The gas-generating baffles 8 are provided with a plurality of slots. The lower ends of each first grid plate 3 and second grid plate 4 are respectively engaged in the corresponding slots. The second arc-initiating plate 6, each first grid plate 3, and each second grid plate 4 are provided with protrusions on both sides. The arc-blocking plates 9 are provided with a plurality of holes 901 that engage with each protrusion. Further, the second arc-initiating plate 6 includes a fixed section 601 and an extension section 602. The fixed section 601 is provided with protrusions on both sides. The fixed section 601 and the second grid plate 4 at the lower end of the second arc-extinguishing grid plate group are arranged parallel or substantially parallel to each other. The extension section 602 is configured to be bent and connected to the fixed section 601 and extend upward at an angle. In this embodiment, the second arc-inducing plate 6 is configured to consist of a fixed section 601 and an extension section 602, with the fixed section 601 and the second grid plate 4 at the lower end of the second arc-extinguishing grid plate group being parallel or substantially parallel to each other. Compared to the existing moving contact arc-inducing plate where the fixed section extends vertically upwards and occupies the rear position of the arc-extinguishing space, this embodiment configures the fixed section 601 to be parallel or substantially parallel to the second grid plate 4 at the lower end of the second arc-extinguishing grid plate group, which preferably saves space and allows for better installation of the second arc-extinguishing grid plate group.

[0030] Please refer to the appendix. Figure 1 To be continued Figure 4 An embodiment of the present invention also provides a switching device, including a moving contact 1, a stationary contact 2, and the aforementioned arc-extinguishing device. The stationary contact 2 is fixedly disposed at the bottom front side of the arc-extinguishing device. The moving contact 1 is disposed correspondingly to the stationary contact 2, and the moving contact 1 is configured to swing backward relative to the stationary contact 2 to form a break with the stationary contact 2. The switching device is a frame circuit breaker or a disconnecting switch. This application specifically uses the structure of a frame circuit breaker as an example for illustration.

[0031] Furthermore, the frame circuit breaker also includes an arc-extinguishing chamber flame extinguishing structure. This structure includes flame extinguishing plates 10 with several ventilation holes 1001 and an arc-extinguishing chamber partition 11 installed on the top of the arc-extinguishing chamber. The partition 11 has several spaced-apart first partition ribs 1101 corresponding to the top of the arc-extinguishing grid assembly installed inside the arc-extinguishing chamber. The flame extinguishing plates 10 are configured to be close to each first partition rib 1101 (the close arrangement described in this application is not strictly limited to being tightly attached; it can be tightly attached without gaps, or it can have a certain gap within the technical requirements for arc short-circuit prevention). In this embodiment, by placing the flame extinguishing plates 10 close to each of the first partition ribs 1101 in the arc-extinguishing chamber partition 11, the ventilation channels between the two structures can be effectively reduced, thereby increasing the air pressure when airflow passes through, thus compressing the arc diameter and improving the arc extinguishing effect. Furthermore, the flame extinguishing plate 10 is configured to be in close contact with the upper end of each of the first partition ribs 1101 in the arc extinguishing chamber partition 11, or to form a certain assembly gap with the upper end of each of the first partition ribs 1101, and the size of the assembly gap is configured such that the arc in the interval area between adjacent first partition ribs 1101 will not form a short circuit at the assembly gap during the rising process.

[0032] In one preferred embodiment, the flame extinguishing plate 10 preferably includes a front section 1002 and a rear section 1003. The front section 1002 is a closed structure without openings, and each vent hole 1001 is opened on the rear section 1003. The front section 1002 of the flame extinguishing plate 10 is configured to correspond to the front top edge of the first arc-extinguishing grid plate group. In this embodiment, preferably, the extension range of the front section 1002 is configured to cover at least the top edge positions of the first three first arc-extinguishing grid plates 3 in the first arc-extinguishing grid plate group. More preferably, the extension range of the front section 1002 is configured to cover the top edge positions of the first three to eight first arc-extinguishing grid plates 3 in the arc-extinguishing grid plate group. In this embodiment, since no vent structure is opened at the position of the front section 1002 of the flame extinguishing plate 10, and the front section covers the front top edge of the arc-extinguishing grid plate group, it can achieve a venting effect during the arc ignition stage, which can increase the internal pressure of the space, thereby compressing the arc diameter and improving the arc extinguishing effect.

[0033] In one preferred embodiment, an upper partition 12 is provided at the upper end of the flame extinguishing plate 10. The upper partition 12 contains several second partition ribs 1201 arranged at intervals along the front-back direction, with the lower ends of each second partition rib 1201 tilted forward towards the stationary contact 2. Preferably, a de-ionization mesh 13 is also provided at the upper end of the upper partition 12. In this embodiment, by providing the upper partition 12, and with the de-ionization mesh 13 and arc extinguishing cover 7 also provided at the upper end of the upper partition 12, the de-ionization mesh 13 and arc extinguishing cover 7, in conjunction with the upper partition, can to a certain extent achieve a gas-blocking effect. Thus, a relatively large space is formed inside the upper partition 12, allowing the gas blown out of the arc extinguishing chamber to flow into this space instead of being directly discharged through the de-ionization mesh. In addition, because the voltage of the UL standard is higher, the arc distance generated is longer. In order to meet the requirements of the arc distance, an upper partition is added. On the one hand, it absorbs the metal particles and free arc generated by the arc. On the other hand, because the lower end of each second partition rib 1201 is tilted forward towards the side closer to the stationary contact 2, the exhaust direction of the upper partition is away from the front end of the product, preventing the circuit of the control circuit from being burned.

[0034] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features therein. These modifications or substitutions do not cause the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention. Therefore, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

Claims

1. An arc extinguishing device for arc extinguishing action on an arc generated when a moving contact (1) is separated from a stationary contact (2), characterized in that: The arc extinguishing device is provided with an arc extinguishing space, the side corresponding to the static contact (2) of the arc extinguishing space is defined as the front side direction, and the side away from the static contact (2) is defined as the back side direction, and the moving contact (1) and the static contact (2) are configured to form a closed state at the front side of the arc extinguishing space, the moving contact (1) swings towards the back side of the arc extinguishing space and forms a breaking state with the static contact (2), and the arc extinguishing device is provided with a first arc extinguishing fin group arranged in the front-rear direction in the arc extinguishing space, and a second arc extinguishing fin group arranged at the back side of the arc extinguishing space.

2. The device of claim 1, wherein: The first arc extinguishing fin group is composed of a plurality of first fins (3) arranged in the front-rear direction at intervals, and the lower end of each first fin (3) is inclined forward.

3. The device of claim 2, wherein: The upper end of each first fin (3) is arranged at equal intervals or substantially equal intervals, and the lower end of each first fin (3) is inclined forward so that the interval space between adjacent first fins (3) is narrow at the bottom and wide at the top.

4. The device of claim 1, wherein: The second arc extinguishing fin group is composed of a plurality of second fins (4) arranged in the up-down direction at intervals, and the front end of each second fin (4) is inclined downward.

5. An arc quenching device according to claim 4, characterized in that: The front end of each second fin (4) is arranged at equal intervals or substantially equal intervals, and the back end of each second fin (4) is inclined upward so that the interval space between adjacent second fins (4) is narrow at the front and wide at the back.

6. The device according to any of claims 1 to 5, characterized in that: The arc extinguishing device further comprises a first arc plate (5) corresponding to the static contact (2) and a second arc plate (6) corresponding to the moving contact (1), and the second arc plate (6) is arranged at the bottom of the second arc extinguishing fin group.

7. An arc quenching device according to claim 6, characterized in that: The thickness of the first fin (3) at the front end of the first arc extinguishing fin group is greater than the thickness of the remaining first fins (3) in the first arc extinguishing fin group.

8. The device of claim 6, wherein: The arc extinguishing device further comprises an arc extinguishing cover (7), two gas generating partitions (8) and two arc separating plates (9), the two arc separating plates (9) are arranged at intervals on the left and right, the two gas generating partitions (8) are respectively connected to the inner side of the lower end of the two arc separating plates (9), the arc extinguishing cover (7) is connected to the upper end of the two arc separating plates (9), a plurality of clamping grooves are formed on the gas generating partition (8), the lower end of each first fin (3) and second fin (4) is respectively clamped in each corresponding clamping groove, and the two sides of the second arc plate (6), each first fin (3) and second fin (4) are provided with clamping protrusions, and a plurality of clamping holes (901) are formed on the arc separating plate (9) to clamp the clamping protrusions.

9. The device of claim 6, wherein: The second arc plate (6) comprises a fixed section (601) and an extension section (602), the two sides of the fixed section (601) are provided with clamping protrusions, and the fixed section (601) and the second fin (4) at the lower end of the second arc extinguishing fin group are arranged in parallel or substantially parallel, and the extension section (602) is connected to the fixed section (601) by bending and extends upwardly.

10. A switchgear, characterized by: The arc extinguishing device comprises a moving contact (1), a static contact (2) and the arc extinguishing device of any one of claims 1 to 9, wherein the static contact (2) is fixedly arranged at the front side bottom position of the arc extinguishing device, the moving contact (1) is arranged corresponding to the static contact (2), and the moving contact (1) is configured to swing backward relative to the static contact (2) to form a breaking state with the static contact (2); The switchgear is a frame circuit breaker or disconnector. The switchgear is a frame circuit breaker or disconnector.

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