Arc extinguishing mechanism

Abstract

The utility model relates to an arc extinguishing mechanism, and relates to the technical field of arc extinguishing members, the arc extinguishing mechanism comprises two insulating side plates, a plurality of stacked arc extinguishing grid sheets are arranged between the two insulating side plates, a gap is preset between the adjacent arc extinguishing grid sheets, and the side surfaces, close to each other, of the two insulating side plates are fixed with the two opposite side edges of the arc extinguishing grid sheets in an inserted manner. One side of each arc extinguishing grid sheet is provided with an arc extinguishing gap; an insulating protective plate is arranged on the side surface, far away from the arc extinguishing notch, of the arc extinguishing grid plate, bending parts are fixedly arranged on two opposite edges of the insulating protective plate, and the side surfaces, close to each other, of the two bending parts are in interference butt joint with the side surfaces, far away from each other, of the two insulating side plates; according to the arc extinguishing mechanism, due to the installation arrangement of the insulating protection plate, a worker installs the insulating protection plate on the side surface of the insulating side plate, and further fixes and limits the assembly of the insulating side plate and the plurality of arc extinguishing grid sheets, so that the possibility of looseness and even disassembly when the arc extinguishing mechanism is installed in the circuit breaker is reduced, and the overall assembly stability of the arc extinguishing mechanism is improved.

Description

Technical Field

[0001] This application relates to the technical field of arc extinguishing components, and particularly to an arc extinguishing mechanism. Background Art

[0002] In the power system, as a core safety barrier, miniature circuit breakers are crucial for quickly cutting off the current when the circuit faces emergencies such as overload and short circuit, thereby protecting electrical equipment and personnel from harm. However, when the circuit breaker performs this task, the high-temperature and high-brightness arcs generated during the current breaking process pose a potential threat. If these arcs cannot be effectively controlled and quickly extinguished, they will not only damage the circuit breaker itself but also affect adjacent electrical equipment, causing more extensive damage.

[0003] In related technologies, as an indispensable part of miniature circuit breakers, the effectiveness of the arc extinguishing mechanism directly affects the breaking efficiency and long-term reliability of the circuit breaker. Currently, a common design of the arc extinguishing mechanism includes two insulating side plates and a stacked structure of arc extinguishing grid plates densely arranged therebetween. These grid plates are fixed to the insulating side plates by precise snap-fitting methods, with gaps left between them to guide the arcs, and arc extinguishing notches are cleverly designed on the same side edge to optimize the movement path of the moving contact piece and the arc extinguishing process.

[0004] Although this design can effectively promote arc extinguishing in theory, in actual applications, especially when the arc extinguishing mechanism is assembled and installed inside the circuit breaker, if the operation is improper or the force applied is too large, the assembled parts may become loose or even disassembled due to the physical characteristics of the plug-in fixation. This not only reduces the overall assembly efficiency of the circuit breaker but also increases the risk of failures due to subsequent adjustments, leaving room for improvement. Summary of the Utility Model

[0005] The purpose of this application is to provide an arc extinguishing mechanism to solve the problem that the arc extinguishing mechanism may become loose or even disassembled during the installation process into the circuit breaker in the above-mentioned related technologies.

[0006] An arc extinguishing mechanism provided by this application adopts the following technical solution:

[0007] An arc extinguishing mechanism includes two insulating side plates. A number of stacked arc extinguishing grid plates are provided between the two insulating side plates, and a gap is preset between adjacent arc extinguishing grid plates. The opposite sides of the two insulating side plates close to each other are plugged and fixed to the opposite sides of the arc extinguishing grid plates. An arc extinguishing notch is formed on one side of the arc extinguishing grid plate; an insulating guard plate is provided on the side of the arc extinguishing grid plate away from the arc extinguishing notch. Bent portions are fixedly provided on the opposite two edges of the insulating guard plate, and the opposite sides of the two bent portions close to each other are in interference contact with the opposite sides of the two insulating side plates.

[0008] By adopting the above technical solution, the insulating guard plate is installed on the side of the insulating side plate, further fixing and limiting the assembly of the insulating side plate and several arc extinguishing grid plates, reducing the possibility of loosening or even disintegration when the arc extinguishing mechanism is installed inside the circuit breaker, and improving the overall assembly stability of the arc extinguishing mechanism.

[0009] Optionally, limiting ribs are fixedly provided on the mutually remote sides of the two insulating side plates, and limiting sliding grooves for inserting the limiting ribs are formed in the bending portions.

[0010] By adopting the above technical solution, when installing the insulating guard plate, the worker holds the insulating guard plate, and makes the limiting ribs press-fit into the corresponding limiting sliding grooves, thereby improving the installation stability of the insulating guard plate and reducing the possibility of the insulating guard plate becoming loose during installation.

[0011] Optionally, a guiding inclined surface is provided on the edge of the end of the limiting rib.

[0012] By adopting the above technical solution, it is convenient for the limiting ribs to be inserted into the corresponding limiting sliding grooves along the guiding inclined surface, improving the assembly efficiency of the insulating guard plate.

[0013] Optionally, a guiding inclined surface is provided on the inner edge of the opening of the limiting sliding groove.

[0014] By adopting the above technical solution, it is convenient for the limiting ribs to be inserted into the corresponding limiting sliding grooves along the guiding inclined surface, improving the assembly efficiency of the insulating guard plate.

[0015] Optionally, a positioning protrusion is fixedly provided on the insulating side plate, the outer side surface of the positioning protrusion is an arc surface, and a positioning groove for inserting the positioning protrusion is formed in the bending portion.

[0016] By adopting the above technical solution, due to the cooperative setting of the positioning protrusion and the positioning groove, after the insulating guard plate is installed, the positioning protrusion on the insulating side plate is inserted into the positioning groove on the bending portion, thereby further improving its assembly stability.

[0017] Optionally, a plurality of kidney-shaped heat-conducting holes are formed in the insulating guard plate.

[0018] By adopting the above technical solution, due to the formation of the kidney-shaped heat-conducting holes in the insulating guard plate, when the arc extinguishing mechanism functions, the temperature of the arc extinguishing grid plates will rise, and the heat near the arc extinguishing grid plates will be dissipated to other areas inside the circuit breaker through the kidney-shaped heat-conducting holes, reducing the situation where the temperature in a certain area inside the circuit breaker is too high.

[0019] Optionally, a heat-conducting copper tube is provided on the side surface of the insulating guard plate, the middle of the heat-conducting copper tube is bent and fixedly clamped on the insulating guard plate, and the two ends of the heat-conducting copper tube are respectively located on the opposite side surfaces of the insulating guard plate.

[0020] By adopting the above technical solution, when the arc extinguishing mechanism is applied inside the circuit breaker, due to the installation of the heat-conducting copper tube, the heat diffusion near the arc extinguishing grid is accelerated, and the situation of a relatively high temperature in a certain area inside the circuit breaker is further reduced.

[0021] Optionally, clamping grooves are formed on the mutually remote sides of the two insulating side plates, and anti-slip lines are fixedly arranged on the inner walls of the clamping grooves.

[0022] By adopting the above technical solution, when installing the arc extinguishing mechanism, the staff can place their fingers into the clamping grooves to clamp the mechanism, so as to facilitate the installation of the arc extinguishing mechanism inside the circuit breaker.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. Due to the installation of the insulating guard plate, the staff installs the insulating guard plate on the side of the insulating side plate, further fixing and limiting the assembly of the insulating side plate and several arc extinguishing grids, reducing the possibility of loosening or even disintegration when the arc extinguishing mechanism is installed inside the circuit breaker, and improving the overall assembly stability of the arc extinguishing mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for description in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0026] Figure 1 is the overall structural schematic diagram of the embodiment of the present application;

[0027] Figure 2 is the exploded structural schematic diagram of the embodiment of the present application;

[0028] Figure 3 is the cross-sectional structural schematic diagram of the installation and cooperation of the limiting convex strip and the limiting sliding groove in the embodiment of the present application;

[0029] Figure 4 is Figure 3 the enlarged schematic diagram of part A in

[0030] Figure 5 is Figure 3 the enlarged schematic diagram of part B in

[0031] Figure 6 is the partial cross-sectional structural schematic diagram of the embodiment of the present application showing the installation and cooperation of the positioning protrusion and the limiting groove;

[0032] Figure 7It is a partial cross-sectional structural schematic diagram showing the installation and cooperation of the insulation guard plate in the embodiment of the present application;

[0033] Figure 8 It is a partial cross-sectional structural schematic diagram showing the installation and cooperation of the heat-conducting copper tube in the embodiment of the present application;

[0034] Figure 9 It is a structural schematic diagram showing the distribution of the opening of the relief notch in the embodiment of the present application.

[0035] In the figure, 1 is the insulation side plate; 11 is the fixed through groove; 12 is the limit rib; 121 is the guiding inclined surface; 13 is the positioning protrusion; 14 is the clamping groove; 2 is the arc extinguishing grid piece; 21 is the arc extinguishing notch; 22 is the fixed clamping block; 3 is the insulation guard plate; 31 is the bending part; 311 is the limit sliding groove; 312 is the guiding inclined surface; 313 is the positioning groove; 32 is the waist-shaped heat-conducting hole; 33 is the relief notch; 4 is the heat-conducting copper tube. Detailed implementation manners

[0036] The following further describes the present application in detail with reference to all the drawings.

[0037] Embodiment:

[0038] Refer to Figure 1 and Figure 2 , an arc extinguishing mechanism includes two insulation side plates 1, and a plurality of stacked arc extinguishing grid pieces 2 are arranged between the two insulation side plates 1. There are gaps with the same distance preset between adjacent arc extinguishing grid pieces 2, and an arc extinguishing notch 21 is opened on one side of the arc extinguishing grid piece 2;

[0039] Four fixed clamping blocks 22 are integrally formed on the opposite two edges of the arc extinguishing grid piece 2, with two fixed clamping blocks 22 on the same side. A fixed through groove 11 for the clamping block to penetrate and insert is opened on the insulation side plate 1, and the fixed clamping block 22 is in interference fit with the inner wall of the fixed through groove 11, so as to fix the insertion of the opposite two side edges of the two insulation side plates 1 and the arc extinguishing grid piece 2.

[0040] Refer to Figure 2 and Figure 3 , an insulation guard plate 3 is provided on the side of the arc extinguishing grid piece 2 away from the arc extinguishing notch 21. Bending parts 31 are integrally formed on the opposite two edges of the insulation guard plate 3, and the opposite sides of the two bending parts 31 are in interference contact with the opposite sides of the two insulation side plates 1;

[0041] Limit ribs 12 are integrally formed on the opposite sides of the two insulation side plates 1 in the vertical direction. At the same time, a limit sliding groove 311 for the limit rib 12 to insert is opened on the bending part 31, so as to further limit and fix the assembly of the insulation side plate 1 and the insulation guard plate 3.

[0042] Refer to Figure 3 , Figure 4 andFigure 5 A guiding slope 121 is provided on the end edge of the limiting convex strip 12, and a guiding slope 312 is provided on the inner edge of the opening of the limiting slide groove 311; the limiting convex strip 12 can be inserted into the corresponding limiting slide groove 311 along the guiding slope 312 and the guiding slope 121, which facilitates the assembly of the insulating guard plate 3.

[0043] Reference Figure 6 The two insulating side plates 1 are integrally formed with positioning protrusions 13 on the sides away from each other, wherein the outer side surface of the positioning protrusion 13 is an arc surface, and the arc length corresponding to the arc surface is a minor arc. At the same time, a positioning groove 313 for inserting the positioning protrusion 13 is opened on the bending portion 31; when the insulating protective plate 3 is installed, the positioning protrusion 13 on the insulating side plate 1 is inserted into the positioning groove 313 on the bending portion 31, so as to further improve its assembly stability.

[0044] Reference Figure 7 A clamping groove 14 is provided on the sides of the two insulating side plates 1 that are away from each other, and an anti-slip groove (not shown in the figure) is fixed on the inner wall of the clamping groove 14. When installing the arc extinguishing mechanism, the staff can put their fingers into the clamping groove 14 to clamp the mechanism.

[0045] Reference Figure 7 A plurality of waist-shaped heat-conducting holes 32 are provided on the insulating protective plate 3. When the arc extinguishing mechanism works, the temperature of the arc extinguishing grid 2 will increase, and the heat near the arc extinguishing grid 2 will be dissipated to other areas in the circuit breaker through the waist-shaped heat-conducting holes 32, thereby reducing the high temperature in a certain area in the circuit breaker.

[0046] Reference Figure 7 , Figure 8 and Figure 9 A heat-conducting copper tube 4 is provided on the side of the insulating guard plate 3, wherein the heat-conducting copper tube 4 is a pipe that transfers heat from one place to another place by utilizing the thermal conductivity of copper. This is a conventional heat-conducting structure and will not be described in detail here; and the heat-conducting copper tube 4 is not in direct contact with the arc-extinguishing grid 2;

[0047] The middle part of the heat-conducting copper tube 4 is bent and fixed on the insulating guard plate 3. The insulating guard plate 3 has two opposite sides with recesses 33 for the heat-conducting copper tube 4 to be inserted into. The two ends of the heat-conducting copper tube 4 are respectively fixed on the two opposite sides of the insulating guard plate 3; thereby accelerating the diffusion of heat near the arc-extinguishing grid 2 and further reducing the high temperature in a certain area of ​​the circuit breaker.

[0048] The implementation principle of the embodiment of the present application is:

[0049] When installing the insulating guard plate 3, the staff holds the insulating guard plate 3 and inserts the limiting convex strip 12 into the corresponding limiting sliding groove 311 along the guiding inclined surface 312 and the guiding inclined surface 121. At the same time, the positioning protrusion 13 on the insulating side plate 1 is inserted into the positioning groove 313 on the bending part 31, and then the two ends of the heat-conducting copper tube 4 are respectively fixed on the opposite side surfaces of the insulating guard plate 3.

[0050] Unless otherwise defined, the terms or scientific terms used in this application shall have the ordinary meanings understood by those of ordinary skill in the field to which this application belongs. The terms "first", "second", "third" and similar words used in the text of this application do not denote any order, quantity or importance, but are only used to distinguish different components. Words such as "a" or "an" do not denote a quantity limitation either, but mean that there is at least one. Words such as "comprising" or "including" mean that the elements or objects appearing before "comprising" or "including" cover the elements or objects listed after "comprising" or "including" and their equivalents, and do not exclude other elements or objects. "Upper", "lower", "left", "right", etc. are only used to indicate the relative position relationship. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0051] The embodiments of this specific implementation manner are all preferred embodiments of this application, and do not limit the protection scope of this application accordingly. The same components are denoted by the same reference numerals. Therefore, all equivalent changes made according to the structure, shape and principle of this application shall be covered within the protection scope of this application.

Claims

1. An arc extinguishing mechanism, comprising two insulating side plates (1), a plurality of stacked arc extinguishing grids (2) being arranged between the two insulating side plates (1), a gap being preset between adjacent arc extinguishing grids (2), the side surfaces of the two insulating side plates (1) close to each other being plugged and fixed to the two side edges opposite to the arc extinguishing grids (2), and an arc extinguishing notch (21) being opened on one side of the arc extinguishing grids (2); It is characterized in that An insulating protective plate (3) is provided on the side of the arc extinguishing grid (2) away from the arc extinguishing notch (21), and two opposite edges of the insulating protective plate (3) are fixedly provided with bent portions (31), and the sides of the two bent portions (31) close to each other are in interference contact with the sides of the two insulating side plates (1) away from each other.

2. An arc extinguishing mechanism according to claim 1, characterized in that: A limiting convex strip (12) is fixedly provided on the side surfaces of the two insulating side plates (1) that are away from each other, and a limiting sliding groove (311) for inserting the limiting convex strip (12) is provided on the bending portion (31).

3. An arc extinguishing mechanism according to claim 2, characterized in that: A guiding inclined surface (121) is provided on the end edge of the position-limiting convex strip (12).

4. An arc extinguishing mechanism according to claim 3, characterized in that: A guiding inclined surface (312) is provided on the inner edge of the opening of the limiting sliding groove (311).

5. The arc extinguishing mechanism according to claim 1, characterized in that: A positioning protrusion (13) is fixedly provided on the insulating side plate (1), the outer side surface of the positioning protrusion (13) is an arc surface, and a positioning groove (313) for the positioning protrusion (13) to be inserted is provided on the bending portion (31).

6. The arc extinguishing mechanism according to claim 1, characterized in that: The insulating protective plate (3) is provided with a plurality of waist-shaped heat-conducting holes (32).

7. The arc extinguishing mechanism according to claim 1, characterized in that: A heat-conducting copper tube (4) is provided on the side of the insulating protective plate (3); the middle portion of the heat-conducting copper tube (4) is bent and fixedly clamped on the insulating protective plate (3); and the two ends of the heat-conducting copper tube (4) are respectively located on two opposite side surfaces of the insulating protective plate (3).

8. The arc extinguishing mechanism according to claim 1, characterized in that: A clamping groove (14) is provided on the side surfaces of the two insulating side plates (1) that are away from each other, and an anti-slip pattern is fixed on the inner wall of the clamping groove (14).

Images