Arc extinguish chamber of circuit breaker

Abstract

The utility model discloses an arc extinguish chamber of a circuit breaker, which is characterized in that a body is provided with an accommodating cavity, the accommodating cavity accommodates three arc extinguish grid sheet groups, and the three arc extinguish grid sheet groups comprise a first arc extinguish grid sheet group, a second arc extinguish grid sheet group and a third arc extinguish grid sheet group; two ends of the first grid plate are respectively matched with the tail end of the first arc extinguishing grid plate group and the tail end of the second arc extinguishing grid plate group; two ends of the second grid plate are respectively matched with the head end of the second arc extinguishing grid plate group and the tail end of the third arc extinguishing grid plate group; the arc generated by the contact assembly moves into the containing cavity, due to the connection arrangement of the first grid piece and the second grid piece, the arc movement length can be increased under the three conditions whether the arc enters the containing cavity from the first arc extinguishing grid piece set or the second arc extinguishing grid piece set or the third arc extinguishing grid piece set, and therefore the arc extinguishing effect is improved.

Description

Technical Field

[0001] The utility model relates to the field of electrical technology, in particular to an arc extinguishing chamber of a circuit breaker. Background Art

[0002] In order to extinguish the arc, an arc extinguishing chamber is usually set in the circuit breaker. The arc extinguishing chamber uses arc extinguishing grids and gas-generating materials to extinguish the arc. However, with the development of new energy sources such as photovoltaics, the demand for direct current or high current in circuit breakers is increasing day by day. Conventional arc extinguishing chambers obviously cannot meet this demand. How to increase the arc extinguishing capacity of the arc extinguishing chamber on the existing basis has become a technical problem that technicians in this field need to solve urgently. Utility Model Content

[0003] Therefore, the technical problem to be solved by the present invention is how to increase the arc extinguishing capacity of the arc extinguishing chamber. To this end, an arc extinguishing chamber of a circuit breaker comprises:

[0004] A body, wherein the body is provided with an accommodating cavity, wherein the accommodating cavity accommodates three arc-extinguishing grid groups, wherein the arc-extinguishing grid groups are arranged in a first direction, wherein the arc-extinguishing grid groups include a plurality of arc-extinguishing grids arranged in a second direction, and wherein the three arc-extinguishing grid groups include a first arc-extinguishing grid group, a second arc-extinguishing grid group, and a third arc-extinguishing grid group;

[0005] A first grid piece, the first grid piece is accommodated in the accommodation cavity; two ends of the first grid piece are respectively matched with the end of the first arc-extinguishing grid piece group and the end of the second arc-extinguishing grid piece group;

[0006] The second grid piece is accommodated in the accommodating cavity; two ends of the second grid piece are respectively matched with the head end of the second arc-extinguishing grid piece group and the end of the third arc-extinguishing grid piece group.

[0007] The first grid piece is accommodated between the first arc-extinguishing grid piece group and the second arc-extinguishing grid piece group. The first grid piece is provided with an extension portion, and the extension portion extends toward a head end side of the first arc-extinguishing grid piece group.

[0008] The extension portion is U-shaped or V-shaped.

[0009] The first grid is provided with two first drainage parts, and the two first drainage parts are respectively matched with the end of the first arc-extinguishing grid group and the end of the second arc-extinguishing grid group.

[0010] It also includes a first insulating member, which is accommodated in the accommodating cavity and is in contact with the first grid sheet.

[0011] The invention also includes a second insulating member, wherein the second insulating member is located between the second arc-extinguishing grid group and the third arc-extinguishing grid group.

[0012] The second insulating member is provided with a shielding portion.

[0013] A shielding member is also included. The second insulating member is provided with a fixing cavity. The shielding member is located in the fixing cavity and forms the shielding portion.

[0014] The second insulating member is connected and fixed to the second grid; or the second insulating member is connected and fixed to the side wall of the accommodating cavity.

[0015] It also includes a fixing frame, which is accommodated in the accommodating cavity and connected to the arc-extinguishing grid plate group.

[0016] The technical solution of the utility model has the following advantages:

[0017] 1. The utility model provides an arc extinguishing chamber of a circuit breaker. With this structural arrangement, the arc generated by the contact assembly moves into the accommodating chamber. Due to the connection arrangement of the first grid and the second grid, the arc enters the accommodating chamber from the first arc extinguishing grid group, the second arc extinguishing grid group, or the third arc extinguishing grid group. In all three cases, the length of the arc movement will be increased, thereby improving the arc extinguishing effect.

[0018] 2. The arc extinguishing chamber of a circuit breaker provided by the utility model further increases the movement length of the arc by setting an extension portion. The arc passes through the end of the first arc extinguishing grid group, then passes through the extension portion of the first grid, and finally enters the end of the second arc extinguishing grid group, thereby improving the overall arc extinguishing effect.

[0019] 3. The arc extinguishing chamber of a circuit breaker provided by the utility model has an extended portion whose shape is set to better increase the length of arc movement.

[0020] 4. In the arc extinguishing chamber of a circuit breaker provided by the utility model, the provision of the first drainage portion better realizes the coordination between the first grid and the first arc extinguishing grid group and the second arc extinguishing grid group.

[0021] 5. The arc extinguishing chamber of a circuit breaker provided by the utility model has a first insulating member, which forms an insulating protection effect to prevent arcing. In addition, the insulating protection can also be directly performed through the internal structure of the accommodating chamber.

[0022] 6. The arc extinguishing chamber of a circuit breaker provided by the utility model has a second insulating member, which forms an insulating protection effect to prevent arcing. In addition, the insulating protection can also be directly performed through the internal structure of the accommodating chamber.

[0023] 7. The arc extinguishing chamber of a circuit breaker provided by the utility model has a shielding part, which forms a shielding effect to prevent interference from occurring and affecting the magnetic blowing effect.

[0024] 8. The utility model provides an arc extinguishing chamber of a circuit breaker, wherein the shielding member forms a shielding effect by being located in the second insulating member, and the shielding member does not form an electrical connection with the first grid or the second grid or the arc extinguishing grid group, and the shielding member here can be a metal member, such as an iron sheet.

[0025] 9. The utility model provides an arc extinguishing chamber of a circuit breaker, wherein the second insulating member cooperates with the second grid to form a fixing effect, which may be adhesive fixing or bolt fixing; the second insulating member is connected and fixed to the side wall of the accommodating cavity, thereby achieving the fixing effect of the second insulating member, and the fixing method may be riveting fixing or plug-in fixing.

[0026] 10. The utility model provides an arc extinguishing chamber of a circuit breaker, the setting of a fixing frame, and the fixing frame cooperates with the arc extinguishing grid group to form a modular structure, which is convenient for overall assembly and makes installation more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 A schematic diagram of the structure of an arc extinguishing chamber of a circuit breaker provided by the utility model;

[0029] Figure 2 A cross-sectional view of an arc extinguishing chamber of a circuit breaker provided by the utility model;

[0030] Figure 3 A partial exploded view of an arc extinguishing chamber of a circuit breaker provided by the utility model;

[0031] Figure 4 A cross-sectional view of the movable contact provided by the utility model in a just-opened position;

[0032] Figure 5 A cross-sectional view of the movable contact provided by the utility model in the middle position;

[0033] Figure 6 A cross-sectional view of the movable contact provided by the utility model in a fully open position;

[0034] Figure 7 A cross-sectional view of the movable contact provided by the utility model in a just-opened position;

[0035] Figure 8A cross-sectional view of the movable contact provided by the utility model in the middle position;

[0036] Fig. 9 This is a cross-sectional view of the movable contact provided by the utility model in the fully open position.

[0037] Description of reference numerals:

[0038] 11. Main body; 12. First arc-extinguishing grid group; 13. Second arc-extinguishing grid group; 14. Third arc-extinguishing grid group; 15. First grid; 16. Second grid; 17. First insulating member; 18. Second insulating member; 19. Shielding member; 21. Arc-starting plate; 22. Fixed frame; 111. Accommodating cavity; 151. Extending portion; 152. First drainage portion; 153. First vertical portion; 154. Second vertical portion; 181. Shielding portion; 182. Fixed cavity; 201. First air duct; 202. Second air duct; 203. Third air duct. DETAILED DESCRIPTION

[0039] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0040] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0043] Example 1

[0044] This embodiment provides an arc extinguishing chamber of a circuit breaker, as shown in the attached Figure 1-9 As shown, including:

[0045] The body 11 is provided with a receiving cavity 111, and the receiving cavity 111 accommodates three arc-extinguishing grid groups. The arc-extinguishing grid groups are arranged in a first direction, and the first direction can be any direction. In this embodiment, the horizontal transverse direction is the first direction, and the horizontal transverse direction can be the X-axis direction in the three-dimensional direction, that is, the three arc-extinguishing grid groups are arranged in the horizontal direction, and can be arranged at equal intervals or at unequal intervals. The arc-extinguishing grid group includes a plurality of arc-extinguishing grids arranged in a second direction. It should be noted that the second direction is different from the first direction. In this embodiment, the second direction is a vertical direction, and the vertical direction can be the Z-axis direction in the three-dimensional direction. The arc-extinguishing grids are arranged at equal intervals. In this embodiment, the number of arc-extinguishing grids in each arc-extinguishing grid group can be consistent or inconsistent, and those skilled in the art can adjust according to actual needs. The arc-extinguishing grids here are arranged tilted, and the tilted arrangement enhances the airflow permeability. The tilt angle and tilt direction of the arc-extinguishing grids here can be adjusted according to actual needs. The three arc-extinguishing grid groups include a first arc-extinguishing grid group 12, a second arc-extinguishing grid group 13 and a third arc-extinguishing grid group 14. The first arc-extinguishing grid group 12, the second arc-extinguishing grid group 13 and the third arc-extinguishing grid group 14 are arranged from left to right. The first arc-extinguishing grid group 12 is located at the leftmost side, and the arc-extinguishing grids in the first arc-extinguishing grid group 12 are tilted toward the upper left. The second arc-extinguishing grid group 13 is located in the middle position, and the arc-extinguishing grids in the second arc-extinguishing grid group 13 are tilted toward the upper right. The third arc-extinguishing grid group 14 is located at the rightmost side, and the arc-extinguishing grids in the third arc-extinguishing grid group 14 are tilted toward the upper right. Here, the position distribution of the arc-extinguishing grid groups and the tilt direction of the arc-extinguishing grids can be adjusted according to actual needs. In this embodiment, the upper end of the first arc-extinguishing grid group 12 is the end of the first arc-extinguishing grid group 12, and the lower end of the first arc-extinguishing grid group 12 is the head end of the first arc-extinguishing grid group 12; the upper end of the second arc-extinguishing grid group 13 is the end of the second arc-extinguishing grid group 13, and the lower end of the second arc-extinguishing grid group 13 is the head end of the second arc-extinguishing grid group 13; the upper end of the third arc-extinguishing grid group 14 is the end of the third arc-extinguishing grid group 14, and the lower end of the third arc-extinguishing grid group 14 is the head end of the third arc-extinguishing grid group 14.

[0046] With the above-mentioned structural distribution, the accommodating chamber 111 is opened at the top and bottom. The bottom opening of the accommodating chamber 111 is used to cooperate with the contact assembly, that is, the cooperation position of the moving contact and the static contact is located below the accommodating chamber 111, that is, the moving contact extends into the accommodating chamber 111 through the bottom opening, so that the arc generated by the opening of the moving contact and the static contact enters the accommodating chamber 111, which has an arc extinguishing effect; the top opening of the accommodating chamber 111 is connected to the circuit breaker, forming a heat dissipation effect, and the gas generated by the arc extinguishing can enter the circuit breaker cavity through the top opening, forming a heat dissipation effect. In addition, the direction of the accommodating chamber 111 can also be adjusted according to actual needs, and it can also be distributed left and right, which still needs to be based on the cooperation position of the moving contact and the static contact.

[0047] The first grid piece 15 is accommodated in the accommodating cavity 111. The first grid piece 15 is specifically located between the first arc-extinguishing grid piece group 12 and the second arc-extinguishing grid piece group 13. The two ends of the first grid piece 15 are respectively matched with the end of the first arc-extinguishing grid piece group 12 and the end of the second arc-extinguishing grid piece group 13, that is, the two ends of the first grid piece 15 are respectively matched with the upper end of the first arc-extinguishing grid piece group 12 and the upper end of the second arc-extinguishing grid piece group 13.

[0048] The second grid 16 is accommodated in the accommodating cavity 111. The second grid 16 is specifically located between the second arc-extinguishing grid group 13 and the third arc-extinguishing grid group 14. The two ends of the second grid 16 are respectively matched with the head end of the second arc-extinguishing grid group 13 and the end of the third arc-extinguishing grid group 14, that is, one end of the second grid 16 is matched with the lower end of the second arc-extinguishing grid group 13, and the other end of the second grid 16 is matched with the upper end of the third arc-extinguishing grid group 14. In this structural arrangement, since the contact assembly is located at the bottom, the arc generated by the contact assembly will move from the bottom to the accommodating cavity 111. Due to the connection arrangement of the first grid 15 and the second grid 16, the arc will increase the length of the arc movement in all three situations, whether from the bottom of the first arc-extinguishing grid group 12, the second arc-extinguishing grid group 13, or the third arc-extinguishing grid group 14, thereby improving the arc extinguishing effect. When the arc enters the accommodating cavity 111 from the lower end of the first arc-extinguishing grid group 12, the arc moves from the lower end of the first arc-extinguishing grid group 12 to the upper end of the first arc-extinguishing grid group 12, and then enters the upper end of the second arc-extinguishing grid group 13 through the first grid 15, continues to move to the lower end of the second arc-extinguishing grid group 13, continues to move to the upper end of the third arc-extinguishing grid group 14 through the second grid 16, and moves downward along the third arc-extinguishing grid group 14, forming a series circuit, which greatly increases the movement length of the arc in the arc-extinguishing chamber, thereby improving the arc extinguishing effect.

[0049] It should also be noted that, in this embodiment, the contact assembly extends to the accommodating cavity 111, and here the contact assembly specifically extends to the bottom of the accommodating cavity 111, and the contact assembly is located below the second direction, that is, the contact assembly is located below the vertical direction. The end of the first arc-extinguishing grid group 12, the end of the second arc-extinguishing grid group 13, and the end of the third arc-extinguishing grid group 14 are all far away from the contact assembly; the head end of the first arc-extinguishing grid group 12, the head end of the second arc-extinguishing grid group 13, and the head end of the third arc-extinguishing grid group 14 are all close to the contact assembly. The contact assembly specifically refers to the moving contact, the static contact, the position where the moving contact and the static contact cooperate, and the arc generated when the moving contact and the static contact are separated, which are all located below the accommodating cavity 111, and then the arc enters the accommodating cavity 111, thereby achieving an arc extinguishing effect. The specific structure of the contact assembly is a prior art, so it is not reflected in the drawings. In addition, those skilled in the art can also adjust the position of the contact assembly according to actual needs.

[0050] Specifically, as attached Figure 1-3 As shown, the first grid 15 is accommodated between the first arc-extinguishing grid group 12 and the second arc-extinguishing grid group 13, and the first grid 15 is provided with an extension portion 151, which extends toward the contact assembly, that is, the extension portion 151 extends downward. By setting the extension portion 151, the movement length of the arc is further increased, and the arc passes through the upper end of the first arc-extinguishing grid group 12, then passes through the extension portion 151 of the first grid 15, and finally enters the upper end of the second arc-extinguishing grid group 13, thereby improving the overall arc extinguishing effect. In addition, the first grid 15 can also directly cooperate with the upper end of the second arc-extinguishing grid group 13.

[0051] Specifically, the extension portion 151 is U-shaped or V-shaped. The shape of the extension portion 151 is set to better increase the length of the arc movement. In addition, the extension portion 151 can also be other shapes, such as W-shaped and the like.

[0052] Specifically, as attached Figure 1-3As shown, the first grid 15 is provided with two first drainage portions 152, and the two first drainage portions 152 are respectively matched with the upper end of the first arc-extinguishing grid group 12 and the upper end of the second arc-extinguishing grid group 13. The provision of the first drainage portions 152 better realizes the coordination between the first grid 15 and the first arc-extinguishing grid group 12 and the second arc-extinguishing grid group 13. The first drainage portion 152 matched with the first arc-extinguishing grid group 12 is inclined toward the upper left, and the first drainage portion 152 matched with the second arc-extinguishing grid group 13 is inclined toward the upper right. The extension portion 151 includes a first vertical portion 153 and a second vertical portion 154, the first vertical portion 153 and the second vertical portion 154 are arranged in parallel, and the lower ends of the two are connected by an arc surface, and the two first drainage portions 152 are respectively connected with the first vertical portion 153 and the second vertical portion 154, and the two first drainage portions 152 extend obliquely outward to form an outer eight-shaped structure, so the entire first grid 15 forms an inverted Ω shape. In this embodiment, the first vertical portion 153 is located close to the first arc-extinguishing grid set 12 , and the second vertical portion 154 is located close to the second arc-extinguishing grid set 13 .

[0053] Specifically, as attached Figure 1-3 As shown, the first insulating member 17 is also included. The first insulating member 17 is accommodated in the accommodating cavity 111. The first insulating member 17 is attached to the first grid 15, and the first insulating member 17 is specifically attached to the extension portion 151. The first insulating member 17 is U-shaped, and the first insulating member 17 is attached to the extension portion 151 to form an insulating protection effect. The setting of the first insulating member 17 forms an insulating protection effect to prevent arcing. In addition, the insulation protection can also be directly performed through the internal structure of the accommodating cavity 111.

[0054] Specifically, as attached Figure 1-3 As shown, the second insulating member 18 is also included, and the second insulating member 18 is located between the second arc-extinguishing grid group 13 and the third arc-extinguishing grid group 14. The second insulating member 18 is provided to form an insulating protection effect to prevent arcing. In addition, the internal structure of the accommodating cavity 111 can also be used for insulation protection.

[0055] Specifically, as attached Figure 1-3As shown, the second insulating member 18 is provided with a shielding portion 181. In this embodiment, the shielding portion 181 is located between the second arc-extinguishing grid group 13 and the second grid 16. The setting of the shielding portion 181 forms a shielding effect, so that the second arc-extinguishing grid group 13 cooperates with the second vertical portion 154 to prevent interference and affect the magnetic blowing effect. Taking the accompanying figure as an example, the right side of the second arc-extinguishing grid group 13 is the second grid 16, and the left side of the second arc-extinguishing grid group 13 is the second vertical portion 154. When the arc passes, the current direction of the second vertical portion 154 and the right second grid 16 is the same, both flowing upward, while the current direction of the second arc-extinguishing grid group 13 flows downward. At this time, the second grid 16 will interfere with the magnetic blowing effect, so shielding is formed by the shielding portion 181 of the second insulating member 18. When the arc-extinguishing grid group will not interfere, it is not necessary to shield through the shielding portion 181. In this embodiment, the size of the shielding portion 181 can be adjusted according to actual needs.

[0056] Specifically, as attached Figure 1-3 As shown, it also includes a shielding member 19, and the second insulating member 18 is provided with a fixed cavity 182, and the shielding member 19 is located in the fixed cavity 182 and forms a shielding portion 181. Here, the fixed cavity 182 can be an opening, and the shielding member 19 enters the fixed cavity 182 through the opening; here, the fixed cavity 182 can also be two openings, and the shielding member 19 can enter the fixed cavity 182 through any one of the openings. It should be noted that the shielding member 19 does not form an electrical connection with the second grid 16 or the arc extinguishing grid group. The shielding member 19 forms a shielding effect by being located in the second insulating member 18 to prevent interference between two adjacent magnetic fields. Here, the shielding member 19 can be a metal member, such as an iron sheet.

[0057] Specifically, as attached Figure 1-3 As shown, the second insulating member 18 is connected and fixed to the second grid 16. The second insulating member 18 cooperates with the second grid 16 to form a fixing effect, which can be adhesive fixation, bolt fixation, or elastic clamping connection. Here, the second insulating member 18 is made of insulating material, and the second grid 16 is made of metal material. The two can be matched in a suitable manner according to actual needs.

[0058] Specifically, as attached Figure 1-3 As shown, the second insulating member 18 is connected and fixed to the side wall of the accommodating cavity 111. By connecting and fixing the second insulating member 18 to the side wall of the accommodating cavity 111, the fixing effect of the second insulating member 18 is achieved, and the fixing method here can be riveting fixing or plug-in fixing.

[0059] Specifically, as attached Figure 1-3As shown, the lower end of the first arc extinguishing grid group 12 and the lower end of the third arc extinguishing grid group 14 cooperate with the moving and static contacts. The lower end of the first arc extinguishing grid group 12 can be the position where the moving and static contacts have just been opened, or the lower end of the third arc extinguishing grid group 14 can be the position where the moving and static contacts have just been opened. Technical personnel in this field can choose to adjust according to actual needs.

[0060] Specifically, when the entire arc extinguishing chamber is working, three air channels are generated. The first arc extinguishing grid group 12 forms a first air channel 201 on the side away from the first vertical portion 153, the second arc extinguishing grid group 13 forms a second air channel 202 on the side away from the second vertical portion 154 (i.e., the side close to the second grid 16), and the third arc extinguishing grid group 14 forms a third air channel 203 on the side away from the second grid 16. The three air channels all move upward. The magnetic field generated by the flowing current and the electromotive repulsion formed when the directions are different drive the gas generated by the arc extinguishing to move upward. For example, when the lower end of the first arc extinguishing grid group 12 can be the position where the moving and static contacts are just opened, the current direction of the first arc extinguishing grid group 12 is vertically upward, and the current direction of the first vertical portion 153 is vertically downward. The directions of the currents between the two are different, and electromotive repulsion will be generated. At this time, the gas generated by the arc extinguishing through the arc extinguishing grid will move obliquely upward under the action of the electromotive repulsion, forming an exhaust effect. Electrodynamic repulsion can also be generated between the second grid 16 and the third arc-extinguishing grid group 14, as long as the current directions of the two are not parallel and the same. In addition to this embodiment, those skilled in the art can also select different numbers of arc-extinguishing grid groups and appropriate shapes of the first grid 15 or the second grid 16 on the basis of this embodiment to form different arc flow directions.

[0061] Specifically, as attached Figure 1-3 As shown, two arc-striking pieces 21 are also included, one of which is located below the first arc-extinguishing grid piece group 12 to form an arc-striking effect, and the other arc-striking piece 21 is located below the third arc-extinguishing grid piece group 14 to also play an arc-striking effect. By setting the arc-striking pieces 21, the arcs of the moving and static contacts from the just-opened position, the middle position and the fully-opened position can be attracted into the arc-extinguishing chamber to form a complete arc-extinguishing effect.

[0062] Specifically, as attached Figure 1-3As shown, it also includes a fixing frame 22, which is two insulating plates arranged in parallel. The arc-extinguishing grids of the arc-extinguishing grid group are riveted and fixed to the insulating plates on both sides, so that a modular structure is formed between the fixing frame 22 and the arc-extinguishing grid group. The arc-extinguishing grids and the insulating plates can also be fixed in other ways, such as plug-in or riveting. The setting of the fixing frame 22, the fixing frame 22 and the arc-extinguishing grid group form a modular structure, which is convenient for overall assembly and makes installation more convenient. Furthermore, the first insulating member 17, the second insulating member 18, the first grid 15, the second grid 16, and the arc-starting plate 21 can all cooperate with the fixing frame 22 to form a modular structure, and then the fixing frame 22 is inserted into the accommodating cavity 111 to achieve the installation and fixing effect.

[0063] Specifically, as attached Figure 1-3 As shown, the body 11 includes two shells, and the two shells cooperate to form a receiving cavity 111. The two shells cooperate to form the receiving cavity 111, making the overall installation and fixation more convenient. Here, the two shells can be bolted, snap-fitted, or ultrasonically welded.

[0064] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. An arc extinguishing chamber of a circuit breaker, characterized in that: include: A body (11), the body (11) being provided with a receiving cavity (111), the receiving cavity (111) receiving three arc-extinguishing grid groups, the arc-extinguishing grid groups being arranged in a first direction, the arc-extinguishing grid groups comprising a plurality of arc-extinguishing grids arranged in a second direction, the three arc-extinguishing grid groups comprising a first arc-extinguishing grid group (12), a second arc-extinguishing grid group (13) and a third arc-extinguishing grid group (14); A first grid piece (15), the first grid piece (15) being accommodated in the accommodation cavity (111); two ends of the first grid piece (15) respectively cooperate with the end of the first arc-extinguishing grid piece group (12) and the end of the second arc-extinguishing grid piece group (13); A second grid piece (16), the second grid piece (16) is accommodated in the accommodating cavity (111); two ends of the second grid piece (16) respectively cooperate with the head end of the second arc-extinguishing grid piece group (13) and the end of the third arc-extinguishing grid piece group (14).

2. The arc extinguishing chamber of the circuit breaker according to claim 1, characterized in that: The first grid piece (15) is accommodated between the first arc-extinguishing grid piece group (12) and the second arc-extinguishing grid piece group (13), and the first grid piece (15) is provided with an extension portion (151), and the extension portion (151) extends toward a head end side of the first arc-extinguishing grid piece group (12).

3. The arc extinguishing chamber of the circuit breaker according to claim 2, characterized in that: The extension portion (151) is U-shaped or V-shaped.

4. The arc extinguishing chamber of the circuit breaker according to claim 1 or 2, characterized in that: The first grid piece (15) is provided with two first drainage portions (152), and the two first drainage portions (152) are respectively matched with the end of the first arc-extinguishing grid piece group (12) and the end of the second arc-extinguishing grid piece group (13).

5. The arc extinguishing chamber of the circuit breaker according to claim 1, 2 or 3, characterized in that: It also comprises a first insulating member (17), wherein the first insulating member (17) is accommodated in the accommodating cavity (111), and the first insulating member (17) is in contact with the first grid plate (15).

6. The arc extinguishing chamber of the circuit breaker according to claim 1, characterized in that: It also includes a second insulating member (18), wherein the second insulating member (18) is located between the second arc-extinguishing grid plate group (13) and the third arc-extinguishing grid plate group (14).

7. The arc extinguishing chamber of the circuit breaker according to claim 6, characterized in that: The second insulating member (18) is provided with a shielding portion (181).

8. The arc extinguishing chamber of the circuit breaker according to claim 7, characterized in that: It also includes a shielding member (19), the second insulating member (18) is provided with a fixing cavity (182), the shielding member (19) is located in the fixing cavity (182) and forms the shielding portion (181).

9. The arc extinguishing chamber of the circuit breaker according to claim 6, 7 or 8, characterized in that: The second insulating member (18) is connected and fixed to the second grid plate (16); or the second insulating member (18) is connected and fixed to a side wall of the accommodating cavity (111).

10. The arc extinguishing chamber of the circuit breaker according to claim 1, characterized in that: It also comprises a fixing frame (22), the fixing frame (22) being accommodated in the accommodating cavity (111), and the fixing frame (22) being connected to the arc-extinguishing grid plate group.

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