An arc chamber for an automatic transfer switch

Abstract

An arc extinguishing chamber of an automatic transfer switch comprises two oppositely arranged side plates and a partition wall connected between the two side plates, the partition wall separates the two side plates into two arc extinguishing cavities, a plurality of arc extinguishing fins are arranged in each of the two arc extinguishing cavities, the side of the plurality of arc extinguishing fins away from the partition wall is an air inlet, the side of the plurality of arc extinguishing fins close to the partition wall is an air outlet, the development length S of the partition wall is greater than the vertical distance H between the two side plates, and the projection length d of the partition wall on any one side plate is less than the length L of the side plate, which not only increases the air outlet, but also ensures that the air pressure of the air outlet is smaller than that of the air inlet.

Description

Technical Field

[0001] This invention relates to the field of low-voltage electrical appliances, and particularly to an arc-extinguishing chamber for an automatic transfer switch. Background Technology

[0002] Automatic transfer switches switch between primary and backup power supplies. The arc generated during the disconnection process must be quickly extinguished by an arc-extinguishing chamber to prevent accidents. For automatic transfer switches with the contacts of the two power supplies arranged opposite each other, an arc-extinguishing chamber is typically placed between the contacts, allowing both power supplies to share a single chamber. Therefore, most existing automatic transfer switches have the arc-extinguishing chamber located in the middle of the chamber. Figure 1-2 The partition wall shown is perpendicular to the side plate. The partition wall divides the arc-extinguishing chamber into two arc-extinguishing cavities corresponding to the two power supplies. When the two power supplies are disconnected, the arc gas flow of the product is discharged to the outside of the switch through their respective arc-extinguishing cavities.

[0003] Because the exhaust ports of the two arc-extinguishing chambers in the existing structure are small, the exhaust effect is limited. If the arc airflow cannot be discharged in time, it will result in a long arcing time and the arc cannot be extinguished quickly, causing damage to the automatic transfer switch. Therefore, the existing arc-extinguishing chamber structure is not suitable for use scenarios that frequently interrupt large currents. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide an arc-extinguishing chamber for an automatic transfer switch that is small in size, has good exhaust effect, and strong arc-extinguishing capability.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An arc-extinguishing chamber for an automatic transfer switch includes two opposing side plates and a partition wall connecting the two side plates. The partition wall divides the two side plates into two arc-extinguishing cavities. Each of the two arc-extinguishing cavities is provided with a plurality of arc-extinguishing grids. The side of the plurality of arc-extinguishing grids away from the partition wall is an air inlet, and the side of the plurality of arc-extinguishing grids close to the partition wall is an exhaust outlet. The unfolded length S of the partition wall is greater than the vertical distance H between the two side plates, and the projected length d of the partition wall on any side plate is less than the length L of the side plate.

[0007] Preferably, the exhaust port is formed by multiple arc-extinguishing grids spaced apart from the partition wall, and the distance from the multiple arc-extinguishing grids to the partition wall increases sequentially in the direction away from the stationary contact.

[0008] Preferably, the shape of the sides of the plurality of arc-extinguishing grid plates near the partition wall matches that of the partition wall.

[0009] Preferably, the projection length d of the partition wall on any side panel is in the range of 0 < d ≤ L / 2.

[0010] Preferably, the projection length d of the partition wall on any side panel is in the range of 0 < d ≤ L / 4.

[0011] Preferably, the partition wall includes an extension section connected to each of the two side plates, and a connecting section connecting the two extension sections.

[0012] Preferably, the two extension sections are respectively arranged on both sides of the centerline perpendicular to the side plate.

[0013] Preferably, the connecting segment includes two transition segments, one end of which is connected to the extension segment, and the other end is connected to each other, and the two transition segments are respectively arc-shaped structures.

[0014] Preferably, the connecting segment has a planar structure and is inclinedly connected between the two extension segments.

[0015] Preferably, the partition wall has a planar structure and is inclinedly connected between the two side plates.

[0016] Preferably, the partition wall has a wave-like structure.

[0017] Preferably, the arc-extinguishing grid has a clearance opening on the side near the air inlet for avoiding the moving contact, a second convex plate is formed on the side of the clearance opening near the convex edge, and a first convex plate is formed on the side of the clearance opening near the concave edge, wherein the width D2 of the second convex plate is greater than the width D1 of the first convex plate.

[0018] The arc-extinguishing chamber of the automatic transfer switch of the present invention increases the exhaust port size by setting the unfolded length S of the partition wall to be greater than the vertical distance H between the two side plates. This ensures that the air pressure at the exhaust port is lower than that at the inlet, allowing the arc airflow to accelerate towards the exhaust port when passing through the inlet. This is particularly suitable for low-voltage power distribution lines that frequently interrupt large currents. Moreover, the partition wall does not obstruct the connection between the exhaust port and the side plates, allowing both ends of the exhaust port to contact the side plates respectively, ensuring that the exhaust port has a large width within a limited volume.

[0019] In addition, the distances from the multiple arc-extinguishing grid plates to the partition wall increase sequentially along the outlet direction closer to the exhaust port, so that the air pressure at the exhaust port outlet is less than that at the inlet, allowing the arc airflow to accelerate towards the outlet, further improving the exhaust effect and arc-extinguishing effect. Attached Figure Description

[0020] Figure 1 It is the arc-extinguishing chamber of an existing automatic transfer switch;

[0021] Figure 2 It is existing technology Figure 1 Top view;

[0022] Figure 3 This is a schematic diagram of the arc-extinguishing chamber in Embodiment 1 of the present invention;

[0023] Figure 4 This is a schematic diagram of the cooperation between the arc-extinguishing grid plate and the partition wall in Embodiment 1 of the present invention;

[0024] Figure 5 This is the present invention. Figure 3 Cross-sectional view;

[0025] Figure 6 This is the present invention. Figure 3 Top view;

[0026] Figure 7 This is a schematic diagram of the partition wall structure in Embodiment 2 of the present invention;

[0027] Figure 8 This is a schematic diagram of the partition wall structure in Embodiment 3 of the present invention;

[0028] Figure 9 This is a schematic diagram of the partition wall structure in Embodiment 4 of the present invention. Detailed Implementation

[0029] like Figure 3 , Figure 4 As shown, the arc-extinguishing chamber of the automatic transfer switch of the present invention includes two oppositely arranged side plates 100 and a partition wall 200 connected between the two side plates 100. The partition wall 200 divides the two side plates 100 into two arc-extinguishing cavities. Each of the two arc-extinguishing cavities is provided with a plurality of arc-extinguishing grids 300. The side of the plurality of arc-extinguishing grids 300 away from the partition wall 200 is an air inlet 120, and the side of the plurality of arc-extinguishing grids 300 close to the partition wall 200 is an exhaust outlet 110. The unfolded length S of the partition wall 200 is greater than the vertical distance H between the two side plates 100, and the projected length d of the partition wall 200 on any side plate 100 is less than the length L of the side plate 100.

[0030] The arc-extinguishing chamber of the automatic transfer switch of the present invention, by setting the unfolded length S of the partition wall 200 to be greater than the vertical distance H between the two side plates 100, increases the exhaust port 110 and makes the exhaust port 110 larger than the air inlet 120, ensuring that the air pressure at the exhaust port 110 is lower than that at the air inlet 120, so that the arc airflow can accelerate towards the exhaust port 110 when passing through the air inlet 120. It is particularly suitable for low-voltage power distribution lines that frequently interrupt large currents.

[0031] The following is in conjunction with the appendix Figures 1 to 9 The given embodiments further illustrate specific implementations of the arc-extinguishing chamber of the automatic transfer switch of the present invention. The arc-extinguishing chamber of the automatic transfer switch of the present invention is not limited to the descriptions in the following embodiments.

[0032] like Figure 3 , Figure 4 As shown, the arc-extinguishing chamber of the automatic transfer switch of the present invention includes two oppositely arranged side plates 100 and a partition wall 200 connected between the two side plates 100. The partition wall 200 divides the two side plates 100 into two arc-extinguishing cavities. Each of the two arc-extinguishing cavities is provided with a plurality of arc-extinguishing grids 300. The side of the plurality of arc-extinguishing grids 300 away from the partition wall 200 is an air inlet 120, and the other side of the plurality of arc-extinguishing grids 300 close to the partition wall 200 is an exhaust port 110. The unfolded length S of the partition wall 200 is greater than the vertical distance H between the two side plates 100, and the projected length d of the partition wall 200 on either side plate 100 is less than the length L of the side plate 100.

[0033] The two arc-extinguishing cavities each form an exhaust port 110 with the partition wall 200 at one end near the partition wall 200, with a width equal to the unfolded length S. The two arc-extinguishing cavities each form an air inlet 120 with a width equal to the vertical distance H between the two side plates 100 at one end away from the partition wall 200.

[0034] like Figure 5 , Figure 6 As shown, the exhaust port 110 is formed by multiple arc-extinguishing grid plates 300 spaced apart from the partition wall 200. The distances from the multiple arc-extinguishing grid plates 300 to the partition wall 200 increase sequentially in the direction away from the stationary contact, making the outlet at the top of the exhaust port 110 larger than the multiple outlets at the bottom of the exhaust port 110, further increasing the exhaust space, allowing the arc airflow to accelerate towards the outlet when passing through the inlet, further improving the exhaust effect and arc-extinguishing effect. Preferably, in this embodiment, the arc-extinguishing grid plate 300 farthest from the exhaust port outlet is closest to the partition wall 200, and their distance is D3.

[0035] Furthermore, in other embodiments of this application, the distances between the plurality of arc-extinguishing grid plates 300 and the partition wall 200 can vary uniformly or non-uniformly. For example, only the distance between the top arc-extinguishing grid plate 300 and the partition wall 200 can be increased, while the distance between the bottom arc-extinguishing grid plate 300 and the partition wall 200 remains unchanged. The distances between the two arc-extinguishing grid plates 300 at both ends of the plurality of arc-extinguishing grid plates 300 and the partition wall 200 can be different. Of course, the distances between the arc-extinguishing grid plates 300 and the partition wall 200 can also remain unchanged.

[0036] The baffle wall 200 of the present invention is centrally symmetrically arranged. The projection length d of the baffle wall 200 on any side plate 100 is in the range of 0 < d ≤ L / 2. When the projection length d is in the range of 0 < d ≤ L / 4, the layout of the arc-extinguishing chamber can be more optimized and reasonable. The center of symmetry of the baffle wall 200 coincides with the geometric center of the two side plates 100, ensuring the balance of arc-extinguishing capacity on both sides of the arc-extinguishing grid plate 300.

[0037] like Figures 3-6 In the illustrated embodiment, the partition wall 200 includes extension sections 212 respectively connected to two side plates 100, and a connecting section 211 connecting the two extension sections 212. Further, the two extension sections are respectively disposed on both sides perpendicular to the centerline of the side plates 100. The connecting section 211 also includes two transition sections 213, one end of which is connected to the extension section 212 and the other end is connected to each other. The two transition sections 213 are respectively arc-shaped and centrally symmetrical, with the connection point between the two transition sections being the center of symmetry. This embodiment can increase the unfolded length S of the partition wall 200, improving the exhaust effect.

[0038] Preferably, the partition wall 200 and the two side plates 100 are processed separately and then assembled together. Figure 3 The partition wall 200 has three slots on each of the two side plates 100, and three inserts 201 corresponding to the slots are provided on the corresponding sides of the partition wall 200 and the two side plates 100. The three inserts 201 can be inserted into the corresponding slots to install the partition wall 200 between the two side plates 100. Of course, the partition wall 200 can also be integrally formed with the two side plates 100, or the partition wall 200 and the two side plates 100 can be processed separately and then assembled together. In addition, although the arc-extinguishing grid plate 300 structure is not shown in the figure, the shape of the side of the arc-extinguishing grid plate 300 near the partition wall 200 matches the partition wall 200, and can be the same or similar.

[0039] like Figure 7 The illustrated embodiment two differs from embodiment one in that the shape of the partition wall is different. The partition wall includes two extension sections 212 and a connecting section 211 disposed between the extension sections 212. The extension sections 212 are respectively disposed on both sides of the centerline perpendicular to the side plate 100. The connecting section 211 connects the two extension sections 212 and has an inclined planar shape. The midpoint of the connecting section 211 is the center of symmetry of the partition wall.

[0040] like Figure 8 In the third embodiment shown, the partition wall 200 has a planar structure and is inclinedly connected between the two side plates 100.

[0041] like Figure 9In the fourth embodiment shown, the partition wall 200 has a wave structure and is composed of two curved sections 214 with arc surfaces. One end of the two curved sections 214 is connected, and the other end of the two curved sections 214 is connected to the center of the side plate 100 or near the center of the side plate 100, respectively.

[0042] It is understood that the number of extension sections on the partition wall 200 can be greater than two. For example, in Embodiment 4, two downward curved sections 214 are provided on the left end and two upward curved sections 214 are provided on the right end, or three curved sections 214 are provided alternately, etc., without specific limitations. In addition, the extension sections can also adopt various structures other than those in the above embodiments, such as a zigzag structure, etc., all of which are within the protection scope of this invention.

[0043] like Figure 3 , Figure 4 As shown, the shape of the sides of the plurality of arc-extinguishing grid plates 300 near the partition wall 200 matches that of the partition wall 200.

[0044] Furthermore, each of the plurality of arc-extinguishing grid plates 300 includes a concave edge 311 corresponding to at least one extension section 212, and a convex edge 312 disposed on the other side of the concave edge 311. The distance from the convex edge 312 to the air inlet 120 is greater than the distance from the concave edge 311 to the air inlet 120. The plurality of arc-extinguishing grid plates 300 are respectively arranged with the baffle wall 200 at intervals through their respective concave edges 311 and convex edges 312 to form the exhaust port 110.

[0045] Because the distance from the protruding edge 312 on the arc-extinguishing grid 300 to the air inlet 120 is greater than the distance from the concave edge 311 to the air inlet 120, the side of the arc-extinguishing grid 300 with the protruding edge 312 can make more full contact with the electric arc, thereby improving the arc-extinguishing effect. Of course, the arc-extinguishing grid 300 may not have the protruding edge 312, as this would result in a larger exhaust port 110 and a better effect in discharging the arc airflow, ensuring the overall arc-extinguishing capability, all of which fall within the protection scope of this invention.

[0046] Furthermore, the arc-extinguishing grid plate 300 has a clearance opening 320 on the side near the air inlet 120 for avoiding the moving contact. A second convex plate 322 is formed on the side of the clearance opening 320 near the convex edge 312, and a first convex plate 321 is formed on the side of the clearance opening 320 near the concave edge 311. The width D2 of the second convex plate 322 is greater than the width D1 of the first convex plate 321. This not only facilitates the arc to fully contact the arc-extinguishing grid plate and improves the arc-extinguishing capability, but also allows the clearance openings 320 on both sides to be asymmetrically arranged, which can adapt to various situations of moving contacts, such as when the moving contacts of two backup power supplies are not on the same plane, but partially overlap or completely misaligned.

[0047] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. An arc-extinguishing chamber for an automatic transfer switch, comprising two opposing side plates (100) and a partition wall (200) connecting the two side plates (100), the partition wall (200) dividing the two side plates (100) into two arc-extinguishing cavities, each of the two arc-extinguishing cavities being provided with a plurality of arc-extinguishing grids (300), the side of the plurality of arc-extinguishing grids (300) away from the partition wall (200) being an air inlet (120), and the side of the plurality of arc-extinguishing grids (300) closer to the partition wall (200) being an exhaust outlet (110), characterized in that: The partition wall (200) includes an extension section (212) connected to two side plates (100) respectively, and a connecting section (211) connected between the two extension sections (212). The two extension sections (212) are respectively arranged on both sides of the center line perpendicular to the side plate (100). The exhaust port (110) is formed by a plurality of arc-extinguishing grid plates (300) spaced apart from the partition wall (200). The unfolded length S of the partition wall (200) is greater than the vertical distance H between the two side plates (100). The two arc-extinguishing cavities are each close to one end of the partition wall (200) and respectively form an exhaust port (110) with the partition wall (200) with an arc-extinguishing cavity whose width is equal to the unfolded length S. The projected length d of the partition wall (200) on any side plate (100) is less than the length L of the side plate (100).

2. The arc-extinguishing chamber of the automatic transfer switch according to claim 1, characterized in that: The distances from the multiple arc-extinguishing grid plates (300) to the partition wall (200) increase sequentially in the direction away from the stationary contact, so that the outlet at the top of the exhaust port (110) is larger than the multiple outlets at the bottom of the exhaust port (110).

3. The arc-extinguishing chamber of the automatic transfer switch according to claim 1, characterized in that: The shape of the sides of the plurality of arc-extinguishing grid plates (300) near the partition wall (200) matches that of the partition wall (200).

4. The arc-extinguishing chamber of the automatic transfer switch according to claim 1, characterized in that: The projection length d of the partition wall (200) on any side plate (100) is in the range of 0 < d ≤ L / 2.

5. The arc-extinguishing chamber of the automatic transfer switch according to claim 1, characterized in that: The projection length d of the partition wall (200) on any side plate (100) is in the range of 0 < d ≤ L / 4.

6. The arc-extinguishing chamber of the automatic transfer switch according to claim 1, wherein the partition wall (200) is centrally symmetrical.

7. The arc-extinguishing chamber of the automatic transfer switch according to claim 1, characterized in that: The plurality of arc-extinguishing grid plates (300) each include a concave edge (311) corresponding to at least one extension section (212) and a convex edge (312) disposed on the other side of the concave edge (311). The distance from the convex edge (312) to the air inlet (120) is greater than the distance from the concave edge (311) to the air inlet (120). The plurality of arc-extinguishing grid plates (300) are respectively arranged with the baffle wall (200) at intervals to form the exhaust port (110) through their respective concave edges (311) and convex edges (312).

8. The arc-extinguishing chamber of the automatic transfer switch according to claim 1, characterized in that: The connecting segment (211) includes two transition segments (213). One end of the transition segment (213) is connected to the extension segment (212), and the other end is connected to each other. The two transition segments (213) are respectively arc-shaped structures.

9. The arc-extinguishing chamber of the automatic transfer switch according to claim 1, characterized in that: The connecting segment (211) has a planar structure and is inclinedly connected between the two extension segments (212).

10. The arc-extinguishing chamber of the automatic transfer switch according to claim 1, characterized in that: The partition wall (200) has a planar structure and is inclinedly connected between the two side plates (100).

11. The arc-extinguishing chamber of the automatic transfer switch according to claim 1, characterized in that: The partition wall (200) has a wave-like structure.

12. The arc-extinguishing chamber of the automatic transfer switch according to claim 7, characterized in that: The arc-extinguishing grid plate (300) has a relief opening (320) on the side near the air inlet (120) for avoiding the moving contact. A second convex plate (322) is formed on the side of the relief opening (320) near the convex edge (312), and a first convex plate (321) is formed on the side of the relief opening (320) near the concave edge (311). The width D2 of the second convex plate (322) is greater than the width D1 of the first convex plate (321).

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