Contact arc extinguishing system and circuit breaker

Abstract

The utility model discloses a contact arc extinguishing system and a circuit breaker. The contact arc extinguishing system comprises a first arc extinguishing chamber, a second arc extinguishing chamber, an insulating mounting piece and a static contact assembly, the first arc extinguish chamber and the second arc extinguish chamber are located on the two sides of the insulation installation part respectively, a first arc extinguish cavity is formed in the first arc extinguish chamber, a second arc extinguish cavity is formed in the second arc extinguish chamber, and a part of the first arc extinguish chamber penetrates through the insulation installation part so that the first arc extinguish cavity can be communicated with the second arc extinguish cavity; the static contact assembly is located on the side, away from the second arc extinguish chamber, of the insulation installation piece and located between the first arc extinguish chamber and the insulation installation piece, a static contact of the static contact assembly is located at the bottom of the first arc extinguish cavity, and the bottom of the first arc extinguish cavity is the part, away from the second arc extinguish cavity, of the first arc extinguish cavity. The contact arc extinguishing system and the circuit breaker disclosed by the utility model have better arc extinguishing capability and better arc extinguishing effect.

Description

Technical Field

[0001] The present application relates to the technical field of low-voltage electrical appliances, and in particular to a contact arc extinguishing system and a circuit breaker. Background Art

[0002] When circuit breakers and other switching devices are disconnected under high voltage or high current conditions, arcs may be generated between the moving and static contacts. The arc temperature is extremely high and can cause serious damage to the equipment. Therefore, circuit breakers are usually equipped with an arc extinguishing chamber, in which multiple arc extinguishing grids are arranged in parallel. The arc extinguishing grids can cut the generated arc to cool and extinguish the arc.

[0003] However, due to the limitation of the space of the circuit breaker itself, the number of arc extinguishing grids arranged in the arc extinguishing chamber is small, and since the static contacts need to be arranged in the arc extinguishing chamber, the arc extinguishing grids at the bottom of the arc extinguishing chamber cannot be effectively utilized, so the arc extinguishing effect is poor. Utility Model Content

[0004] In view of this, the present application provides a contact arc extinguishing system and a circuit breaker, which can enhance the arc extinguishing capability and improve the arc extinguishing effect.

[0005] This application specifically adopts the following technical solutions:

[0006] A first aspect of an embodiment of the present application provides a contact arc extinguishing system, the contact arc extinguishing system comprising a first arc extinguishing chamber, a second arc extinguishing chamber, an insulating mounting member and a static contact assembly;

[0007] The first arc extinguishing chamber and the second arc extinguishing chamber are respectively located on both sides of the insulating mounting member, a first arc extinguishing chamber is formed inside the first arc extinguishing chamber, a second arc extinguishing chamber is formed inside the second arc extinguishing chamber, and a portion of the first arc extinguishing chamber passes through the insulating mounting member so that the first arc extinguishing chamber is connected with the second arc extinguishing chamber;

[0008] The static contact assembly is located on a side of the insulating mounting member away from the second arc extinguishing chamber, and is located between the first arc extinguishing chamber and the insulating mounting member. The static contact point of the static contact assembly is located at the bottom of the first arc extinguishing chamber, and the bottom of the first arc extinguishing chamber is the part of the first arc extinguishing chamber away from the second arc extinguishing chamber.

[0009] Optionally, the first arc-extinguishing chamber comprises a first mounting seat, and a plurality of first arc-extinguishing grids mounted on the first mounting seat, the first mounting seat has the first arc-extinguishing cavity, and the first mounting seat forms a first opening at the top of the first arc-extinguishing cavity, the first opening is communicated with the first arc-extinguishing cavity, and the top of the first arc-extinguishing cavity is opposite to the bottom;

[0010] The insulating mounting piece is provided with an avoidance opening, and the first mounting seat passes through the avoidance opening so that the first opening is communicated with the second arc extinguishing chamber.

[0011] Optionally, the first mounting seat includes an inner frame portion, a bearing portion and a first mounting portion.

[0012] The inner frame portion encloses the first arc extinguishing chamber and the first opening;

[0013] The bearing portion is connected to the outer wall of the inner frame portion, and is used to sequentially bear the static contact assembly and the insulating mounting member, and there is a distance between the bearing portion and the first opening along a first set direction, and the first set direction is a direction in which the top and the bottom of the first arc extinguishing chamber are opposite to each other;

[0014] The first mounting portion is connected to the outer wall of the inner frame portion and is located at a side of the bearing portion away from the first opening. The first mounting portion is used to form a plurality of grid installation grooves to respectively accommodate the plurality of first arc-extinguishing grids.

[0015] Optionally, the inner frame portion includes a U-shaped plate and two extension plates, the plate surface of the U-shaped plate is parallel to the first set direction, the two extension plates are located on the same side of the U-shaped plate and are respectively connected to the side surfaces of the U-shaped plate, the plate surfaces of the two extension plates are spaced and opposite to each other, and the plate surface of each extension plate is coplanar with the plate surface of the U-shaped plate;

[0016] The bearing portion is connected to the outer wall of the U-shaped plate close to the two extension plates;

[0017] The first mounting portion is connected to the outer wall of the extension plate.

[0018] Optionally, the first arc extinguishing chamber further includes a magnetizing component, which is mounted on the first mounting seat and arranged close to the static contact, and is used to provide a magnetic field that causes the arc to move toward the first arc extinguishing grid.

[0019] Optionally, the first mounting seat also includes a second mounting portion, which is connected to the outer wall of the inner frame portion and is located on a side of the first mounting portion away from the first arc-extinguishing grid, and the second mounting portion is used to form a magnetizing mounting groove to accommodate the magnetizing component.

[0020] Optionally, the first mounting seat forms a second opening on one side of the first arc extinguishing chamber, the second opening is communicated with the first arc extinguishing chamber and the first opening, and the second opening is opposite to the plurality of first arc extinguishing grids;

[0021] The second arc-extinguishing chamber comprises a second mounting seat and a plurality of second arc-extinguishing grids mounted on the second mounting seat, the second mounting seat having the second arc-extinguishing cavity, the second mounting seat forming a third opening on one side of the second arc-extinguishing cavity, the third opening being communicated with the second arc-extinguishing cavity and opposite to the plurality of second arc-extinguishing grids, the third opening being communicated with the second opening;

[0022] The contact arc extinguishing system also includes a moving contact assembly, a portion of which can extend into the first arc extinguishing chamber and the second arc extinguishing chamber through the second opening and the third opening, and can move in the first arc extinguishing chamber and the second arc extinguishing chamber to approach or move away from the static contact.

[0023] Optionally, the insulating mounting member includes a first insulating portion and a second insulating portion, and the avoidance opening is located on the first insulating portion;

[0024] The first insulating portion is sandwiched between the first arc extinguishing chamber and the stationary contact assembly, and at least partially wraps a portion of the stationary contact assembly located outside the first arc extinguishing chamber;

[0025] The second insulating portion is vertically arranged on the first insulating portion, and at least a portion of the second insulating portion is located on a side of the plurality of second arc-extinguishing grids away from the moving contact assembly.

[0026] Optionally, the plurality of second arc-extinguishing grids are arranged in parallel and at intervals, and an extension direction of each of the second arc-extinguishing grids is such that the further away from the third opening, the further away from the first arc-extinguishing chamber.

[0027] Optionally, an angle between an extension direction of each of the second arc-extinguishing grids and a second set direction is less than or equal to 5°, and the second set direction is a direction in which the third opening is opposite to the second arc-extinguishing grid.

[0028] Optionally, the second arc-extinguishing chamber further comprises at least one of a first arc-striking member and a second arc-striking member;

[0029] The first arc-starting member is located at a side of the plurality of second arc-extinguishing grids away from the first arc-extinguishing chamber, and at least a portion of the first arc-starting member is located in the second arc-extinguishing chamber, wherein when the moving contact assembly is located at a first position, the first arc-starting member is adjacent to the moving contact and there is a gap therebetween, and the first position is the position where the moving contact assembly is farthest from the static contact;

[0030] The second arc-striking member is located on one side of the plurality of second arc-extinguishing grids close to the first arc-extinguishing chamber, and at least a portion of the second arc-striking member extends into the first arc-extinguishing chamber through the first opening, wherein when the moving contact assembly is located at a second position, the second arc-striking member is adjacent to the moving contact and has a gap therebetween, and the second position is the position of the moving contact assembly when it passes through the first opening.

[0031] A second aspect of an embodiment of the present application provides a circuit breaker, wherein the circuit breaker includes the contact arc extinguishing system described in the first aspect.

[0032] The contact arc extinguishing system and circuit breaker provided in the embodiments of the present application include a first arc extinguishing chamber and a second arc extinguishing chamber that are independent of each other, the first arc extinguishing chamber and the second arc extinguishing chamber are separated by an insulating mounting member, and the first arc extinguishing chamber of the first arc extinguishing chamber is communicated with the second arc extinguishing chamber of the second arc extinguishing chamber; the static contact assembly is located between the insulating mounting member and the first arc extinguishing chamber, and the static contact point of the static contact assembly is located at the bottom of the first arc extinguishing chamber, so that in the early stage of arc generation, the arc can be extinguished by the first arc extinguishing chamber, thereby fully utilizing the arc extinguishing grid; after the arc is elongated, the arc can be divided into two small arcs by the first arc extinguishing chamber and the second arc extinguishing chamber and then extinguished separately, thereby reducing the difficulty of arc extinguishing, thereby improving the arc extinguishing ability of the system and improving the arc extinguishing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 It is a structural schematic diagram of a contact arc extinguishing system provided in an embodiment of the present application;

[0035] Figure 2 yes Figure 1 An exploded view of the contact arc extinguishing system shown;

[0036] Figure 3 is an exploded view of a first arc extinguishing chamber provided in an embodiment of the present application;

[0037] Figure 4 It is a structural schematic diagram of an insulating mounting member provided in an embodiment of the present application;

[0038] Figure 5 is a first structural schematic diagram of a first mounting base provided in an embodiment of the present application;

[0039] Figure 6is a second structural schematic diagram of a first mounting base provided in an embodiment of the present application;

[0040] Figure 7 It is a schematic diagram of the assembly of the first arc extinguishing chamber and the static contact assembly provided in an embodiment of the present application;

[0041] Figure 8 It is a structural schematic diagram of a contact arc extinguishing system (with the moving contact assembly hidden) provided in an embodiment of the present application;

[0042] Fig. 9 is along Figure 8 Sectional view along line AA;

[0043] Fig.10 It is a schematic diagram of the arc position when the moving contact assembly and the stationary contact assembly are just disconnected;

[0044] Fig.11 is a schematic diagram of the arc position when the moving contact assembly is located at the second position;

[0045] Fig.12 It is a schematic diagram of the arc position when the moving contact assembly is located in the first position.

[0046] Reference numerals:

[0047] 1. first arc extinguishing chamber; 11. first arc extinguishing cavity; 111. bottom; 112. top; 12. first mounting seat; 121. inner frame; 1211. U-shaped plate; 1212. extension plate; 122. bearing portion; 123. first mounting portion; 1231. grid plate mounting groove; 124. second mounting portion; 125. first opening; 126. second opening; 1241. magnetizing mounting groove; 13. first arc extinguishing grid; 14. magnetizing member;

[0048] 2. Second arc extinguishing chamber; 21. Second arc extinguishing cavity; 22. Second mounting seat; 23. Second arc extinguishing grid; 24. Third opening; 25. First arc striking member; 26. Second arc striking member;

[0049] 3. Insulation mounting member; 31. Avoidance opening; 32. First insulating portion; 33. Second insulating portion;

[0050] 4. Stationary contact assembly; 41. Stationary contact;

[0051] 5. Moving contact assembly; 51. Moving contact. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0053] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0054] The arc generated by the circuit breaker and other switching electrical appliances when disconnected is generally extinguished by multiple arc extinguishing grids in the arc extinguishing chamber. In the related art, multiple arc extinguishing grids are arranged in parallel along the height direction of the arc extinguishing chamber, but due to the equipment volume limitation of the circuit breaker, the space in the arc extinguishing chamber is limited, and the number of arc extinguishing grids that can be arranged is relatively small; and because the moving and static contacts need to be disconnected in the arc extinguishing chamber, the static contact is arranged in the arc extinguishing chamber, so there will be some arc extinguishing grids located below the static contact. After the arc is generated, these arc extinguishing grids cannot play the role of cutting the arc and cannot be effectively used. Therefore, the arc extinguishing capacity of the arc extinguishing chamber in the related art is insufficient and the arc extinguishing effect is poor.

[0055] The embodiment of the present application provides a contact arc extinguishing system, such as Figure 1 and Figure 2 As shown, the contact arc extinguishing system includes a first arc extinguishing chamber 1, a second arc extinguishing chamber 2, an insulating mounting member 3 and a static contact assembly 4; the first arc extinguishing chamber 1 and the second arc extinguishing chamber 2 are respectively located on both sides of the insulating mounting member 3, a first arc extinguishing chamber 1 is formed inside the first arc extinguishing chamber 1, and a second arc extinguishing chamber 2 is formed inside the second arc extinguishing chamber 2, a part of the first arc extinguishing chamber 1 passes through the insulating mounting member 3 to connect the first arc extinguishing chamber 11 with the second arc extinguishing chamber 21; the static contact assembly 4 is located on the side of the insulating mounting member 3 away from the second arc extinguishing chamber 2, and is located between the first arc extinguishing chamber 1 and the insulating mounting member 3, the static contact point 41 of the static contact assembly 4 is located at the bottom 111 of the first arc extinguishing chamber 11, and the bottom 111 of the first arc extinguishing chamber 11 is the part of the first arc extinguishing chamber 11 away from the second arc extinguishing chamber 21.

[0056] Compared with the arc extinguishing chamber in the related art, the contact arc extinguishing system provided in the embodiment of the present application mainly includes two improvements: first, a large arc extinguishing chamber in the related art is improved into two independent small arc extinguishing chambers, namely a first arc extinguishing chamber 1 and a second arc extinguishing chamber 2 stacked in the height direction, and the first arc extinguishing chamber 11 of the first arc extinguishing chamber 1 and the second arc extinguishing chamber 2 are connected to each other; second, the static contact point 41 of the static contact assembly 4 is located at the bottom 111 of the first arc extinguishing chamber 1, thereby improving the utilization rate of the arc extinguishing grid in the first arc extinguishing chamber 1. Since the static contact 41 of the static contact assembly 4 is located at the bottom 111 of the first arc extinguishing chamber 11, the generated arc can be extinguished by the first arc extinguishing chamber 1 at the initial stage of arc generation (i.e., when the moving contact assembly 5 and the static contact assembly 4 are just beginning to be disconnected and the moving contact 51 is located in the first arc extinguishing chamber 1), thereby ensuring the full utilization of the arc extinguishing grids in the first arc extinguishing chamber 1, thereby improving the space utilization rate of the first arc extinguishing chamber 1; after the moving contact assembly 5 leaves the first arc extinguishing chamber 1 and enters the second arc extinguishing chamber 2, a part of the arc remains in the first arc extinguishing chamber 1, and the other part of the arc continues to be elongated and enters the second arc extinguishing chamber 2, which is equivalent to the arc being divided into two short arcs at this time, and then the two short arcs are extinguished respectively by the first arc extinguishing chamber 1 and the second arc extinguishing chamber 2. Compared with the scheme of extinguishing a strong arc, the scheme of the embodiment of the present application reduces the difficulty of arc extinguishing, thereby improving the arc extinguishing ability of the system and improving the arc extinguishing effect.

[0057] In some embodiments of the present application, Figure 3 As shown, the first arc extinguishing chamber 1 includes a first mounting seat 12, and a plurality of first arc extinguishing grids 13 mounted on the first mounting seat 12, the first mounting seat 12 has a first arc extinguishing cavity 11, and the first mounting seat 12 forms a first opening 125 at the top 112 of the first arc extinguishing cavity 11, the first opening 125 is connected to the first arc extinguishing cavity 11, and the top 112 of the first arc extinguishing cavity 11 is opposite to the bottom 111.

[0058] The first mounting seat 12 is an insulating seat made of an insulating material, and is used to form a first arc extinguishing chamber 11 and to install a plurality of first arc extinguishing grids 13. Optionally, the first mounting seat 12 can also be used to install the insulating mounting member 3 and the static contact assembly 4. The top 112 of the first mounting seat 12 is open to facilitate communication with the second arc extinguishing chamber 21, thereby allowing the moving contact assembly 5 to pass through.

[0059] Optionally, the first mounting seat 12 is an insulating gas-producing part made of insulating gas-producing material. In a high temperature environment after an arc is generated, the first mounting seat 12 will generate airflow, thereby pushing the arc toward the first arc-extinguishing grid 13 to improve the efficiency of extinguishing the arc, thereby improving the arc extinguishing ability of the first arc-extinguishing chamber 1.

[0060] A plurality of first arc-extinguishing grids 13 are stacked and spaced in the first arc-extinguishing chamber 11 along the height direction of the first arc-extinguishing chamber 1, wherein the height direction of the first arc-extinguishing chamber 1 is parallel to the stacking direction of the first arc-extinguishing chamber 1 and the second arc-extinguishing chamber 2. The plurality of first arc-extinguishing grids 13 are used to cut the arc and divide it into a plurality of small arcs, so that the voltage of the small arcs is lower than the arc burning voltage and extinguished.

[0061] like Figure 4 As shown, the insulating mounting member 3 is provided with an avoidance opening 31 , and the first mounting seat 12 passes through the avoidance opening 31 , so that the first opening 125 is in communication with the second arc extinguishing chamber 21 .

[0062] By allowing the first mounting seat 12 to pass through the avoidance opening 31 and extend into the second arc extinguishing chamber 21 to connect the first arc extinguishing chamber 11 and the second arc extinguishing chamber 21, it can be ensured that the environment where the arc is located is an insulating structure except for the moving contact assembly, the static contact assembly and the arc extinguishing grid, thereby preventing the arc from leaking outward, ensuring the arc extinguishing effect and improving the safety performance.

[0063] It is easy to understand that when the moving contact assembly 5 moves in the first arc extinguishing chamber 11 and the second arc extinguishing chamber 21, it will also pass through the first opening 125 and the avoidance opening 31. Figure 5 As shown, the first mounting seat 12 includes an inner frame portion 121, a bearing portion 122 and a first mounting portion 123, the inner frame portion 121 encloses a first arc extinguishing cavity 11 and a first opening 125; the bearing portion 122 is connected to the outer wall of the inner frame portion 121, and is used to sequentially carry the static contact assembly 4 and the insulating mounting member 3, and there is a spacing between the bearing portion 122 and the first opening 125 along a first set direction X, and the first set direction X is a direction relative to the top 112 and the bottom 111 of the first arc extinguishing cavity 11; the first mounting portion 123 is connected to the outer wall of the inner frame portion 121, and is located on a side of the bearing portion 122 away from the first opening 125, and the first mounting portion 123 is used to form a plurality of grid plate mounting grooves 1231 to respectively accommodate a plurality of first arc extinguishing grid plates 13.

[0064] Since there is a certain distance between the bearing portion 122 and the top 112 of the inner frame portion 121, when the bearing portion 122 carries the static contact assembly 4 and the insulating mounting member 3, the inner frame portion 121 can also play a role in assembling and positioning the static contact assembly 4 and the insulating mounting member 3, and after the inner frame portion 121 extends into the second arc extinguishing chamber 21 through the avoidance opening 31 on the insulating positioning member, the inner frame portion 121 can also play a role in assembling and positioning the second arc extinguishing chamber 2, thereby improving the assembly accuracy and reducing the assembly difficulty.

[0065] Optionally, the first mounting seat 12 is an integrally formed structure, that is, the inner frame portion 121, the bearing portion 122 and the first mounting portion 123 are integrally connected, thereby ensuring that the first mounting seat 12 has good mechanical properties and sufficient supporting strength.

[0066] In some embodiments of the present application, Figure 6 As shown, the inner frame portion 121 includes a U-shaped plate 1211 and two extension plates 1212. The plate surface of the U-shaped plate 1211 is parallel to the first set direction X. The two extension plates 1212 are located on the same side of the U-shaped plate 1211 and are respectively connected to the side surfaces of the U-shaped plate 1211. The plate surfaces of the two extension plates 1212 are spaced apart from each other, and the plate surface of each extension plate 1212 is coplanar with the plate surface of the U-shaped plate 1211. The bearing portion 122 is connected to the outer wall of the U-shaped plate 1211 close to the two extension plates 1212, and the first mounting portion 123 is connected to the outer wall of the extension plate 1212.

[0067] The inner frame 121 is assembled and positioned with the static contact assembly 4, the insulating mounting member 3 and the second arc extinguishing chamber 2 through the U-shaped plate 1211, and the plurality of first arc extinguishing grids 13 are installed through the two extension plates 1212. The interval between the two extension plates 1212 is a part of the first arc extinguishing chamber 11, and the arc will be generated in the interval. After the plurality of first arc extinguishing grids 13 are installed, the plurality of first arc extinguishing grids 13 will be exposed on the sides of the two extension plates 1212, so as to facilitate the segmentation of the generated arc.

[0068] Alternatively, if Figure 6 As shown, the bearing portion 122 is also a U-shaped plate, and the plate surface of the bearing portion 122 is perpendicular to the first set direction X, so as to achieve a more stable and reliable bearing effect through its plate surface. The first mounting portion 123 includes a plurality of mounting plates arranged at intervals along the height direction of the first arc extinguishing chamber 1, and the gaps between the plurality of mounting plates are grid plate mounting grooves 1231, and the first arc extinguishing grid 13 is suitable for being inserted into the corresponding grid plate mounting grooves 1231.

[0069] In some embodiments of the present application, Figure 2 and Figure 3 As shown, the first arc extinguishing chamber 1 further includes a magnetizing member 14, which is mounted on the first mounting seat 12; Figure 7 As shown, the magnetizing member 14 is disposed close to the stationary contact 41 , and is used to provide a magnetic field for moving the arc toward the first arc extinguishing grid 13 .

[0070] By providing the magnetizing member 14 , the arc can be urged to move toward the first arc extinguishing grid 13 , thereby lengthening the arc, thereby improving the arc extinguishing capability and arc extinguishing efficiency.

[0071] Optionally, the magnetizing member 14 may be a magnet made of magnetic material, or may be a magnetic block made of magnetic material, such as an iron block. It is easy to understand that the closer the magnetizing member 14 is to the static contact 41, the better the magnetizing effect.

[0072] In some embodiments of the present application, Figure 5 As shown, the first mounting seat 12 also includes a second mounting portion 124, which is connected to the outer wall of the inner frame portion 121 and is located on a side of the first mounting portion 123 away from the first arc-extinguishing grid 13. The second mounting portion 124 is used to form a magnetizing mounting groove 1241 to accommodate the magnetizing component 14.

[0073] In some examples, there are two magnetizing installation grooves 1241 , which are respectively arranged on opposite sides of the first arc extinguishing chamber 11 , and the static contact 41 of the static contact assembly 4 is located between the two magnetizing installation grooves 1241 , and a magnetizing component 14 is arranged in each magnetizing installation groove 1241 .

[0074] In some embodiments of the present application, Figure 3 As shown, the first mounting seat 12 forms a second opening 126 on one side of the first arc extinguishing chamber 11 , the second opening 126 is communicated with the first arc extinguishing chamber 11 and the first opening 125 , and the second opening 126 is opposite to the plurality of first arc extinguishing grids 13 .

[0075] like Figure 2 As shown, the second arc extinguishing chamber 2 includes a second mounting seat 22, and a plurality of second arc extinguishing grids 23 mounted on the second mounting seat 22, the second mounting seat 22 has a second arc extinguishing cavity 21, the second mounting seat 22 forms a third opening 24 on one side of the second arc extinguishing cavity 21, the third opening 24 is connected to the second arc extinguishing cavity 21, and is opposite to the plurality of second arc extinguishing grids 23, and the third opening 24 is connected to the second opening 126.

[0076] The second mounting seat 22 is an insulating seat made of an insulating material, and is used to form a second arc extinguishing chamber 21 and to install a plurality of second arc extinguishing grids 23. Optionally, the bottom 111 of the second mounting seat 22 is positioned and matched with the top 112 of the first mounting seat 12. The bottom of the second mounting seat 22 is open to facilitate communication with the first arc extinguishing chamber 11, thereby allowing the moving contact assembly 5 to pass through.

[0077] Optionally, similar to the first mounting seat 12, the second mounting seat 22 may also be an insulating gas-generating member made of insulating gas-generating material. In a high temperature environment after the arc is generated, the second mounting seat 22 will generate airflow, thereby pushing the arc in the second arc-extinguishing chamber 21 toward the second arc-extinguishing grid 23 to improve the efficiency of extinguishing the arc, thereby improving the arc-extinguishing ability of the second arc-extinguishing chamber 2. A plurality of second arc-extinguishing grids 23 are stacked and arranged in intervals along the height direction of the second arc-extinguishing chamber 2 in the second arc-extinguishing chamber 21, wherein the height direction of the second arc-extinguishing chamber 2 is parallel to the stacking direction of the first arc-extinguishing chamber 1 and the second arc-extinguishing chamber 2. A plurality of second arc-extinguishing grids 23 are used to cut the arc, so that it is broken into a plurality of small arcs, so that the voltage of the small arcs is lower than the arc burning voltage and extinguished.

[0078] Continue to see Figure 2 The contact arc extinguishing system also includes a moving contact assembly 5, a portion of which can extend into the first arc extinguishing chamber 11 and the second arc extinguishing chamber 21 through the second opening 126 and the third opening 24, and can move in the first arc extinguishing chamber 11 and the second arc extinguishing chamber 21 to approach or move away from the static contact 41.

[0079] In some embodiments of the present application, Figure 4 As shown, the insulating mounting member 3 includes a first insulating portion 32 and a second insulating portion 33, and the avoidance opening 31 is located on the first insulating portion 32; Figure 2 As shown, the first insulating portion 32 is sandwiched between the first arc extinguishing chamber 1 and the static contact assembly 4, and at least partially wraps the portion of the static contact assembly 4 located outside the first arc extinguishing chamber 1; the second insulating portion 33 is vertically arranged on the first insulating portion 32, and at least a portion of the second insulating portion 33 is located on the side of the plurality of second arc extinguishing grids 23 away from the moving contact assembly 5.

[0080] The insulating mounting member 3 completely separates the first arc extinguishing chamber 1 from the second arc extinguishing chamber 2 and completely separates the moving contact assembly 5 from the stationary contact assembly 4 , thereby preventing the generated arc from leaking out of the first arc extinguishing chamber 11 or the second arc extinguishing chamber 21 .

[0081] In some embodiments of the present application, Fig. 9 As shown, a plurality of second arc-extinguishing grids 23 are arranged in parallel and at intervals, and the extending direction of each second arc-extinguishing grid 23 is such that the further away from the third opening 24 , the further away from the first arc-extinguishing chamber 1 .

[0082] After entering the second arc extinguishing chamber 2, the arc is stretched while moving, and the middle part of the stretched arc gradually tilts toward the top 112 of the second arc extinguishing chamber 2. By tilting the plurality of second arc extinguishing grids 23 so that their extension direction is consistent with the stretching direction of the arc, a better arc cutting effect can be achieved, thereby improving the ability to extinguish the arc.

[0083] Alternatively, if Fig. 9 As shown, the included angle between the extension direction of each second arc-extinguishing grid 23 and the second set direction is less than or equal to 5°, and the second set direction Y is the direction in which the third opening 24 is opposite to the second arc-extinguishing grid 23 .

[0084] In some embodiments of the present application, the second arc-extinguishing chamber 2 further includes at least one of a first arc-striking member 25 and a second arc-striking member 26 .

[0085] The first arc-striking member 25 is located on a side of the plurality of second arc-extinguishing grids 23 away from the first arc-extinguishing chamber 1, and at least a portion of the first arc-striking member 25 is located in the second arc-extinguishing chamber 21, wherein when the moving contact assembly 5 is located at the first position, the first arc-striking member 25 is adjacent to the moving contact 51 and has a gap therebetween, and the first position is the position where the moving contact assembly 5 is farthest from the static contact 41.

[0086] The first arc-starting member 25 is used to make the arc move from the moving contact 51 of the moving contact assembly 5 to the second arc-extinguishing grid 23 more quickly, thereby improving the arc-extinguishing efficiency and achieving better and more thorough segmentation of the arc.

[0087] The second arc-striking member 26 is located on one side of the plurality of second arc-extinguishing grids 23 close to the first arc-extinguishing chamber 1, and at least a portion of the second arc-striking member 26 extends into the first arc-extinguishing chamber 11 through the first opening 125, wherein when the moving contact assembly 5 is located at the second position, the second arc-striking member 26 is adjacent to the moving contact 51 and has a gap therebetween, and the second position is the position of the moving contact assembly 5 when it passes through the first opening 125.

[0088] The second arc-starting member 26 is used to enable the arc on the moving contact 51 of the moving contact assembly 5 to quickly move toward the first arc-extinguishing grid 13 and the second arc-extinguishing grid 23 when passing through the first opening 125, thereby being divided into two short arcs. The two short arcs are respectively located in the first arc-extinguishing cavity 11 and the second arc-extinguishing cavity 21, and are respectively divided by multiple first arc-extinguishing grids 13 and multiple second arc-extinguishing grids 23, thereby improving the arc extinguishing efficiency and the arc extinguishing capacity.

[0089] The following is combined with Figure 10-12 , the movement of the arc during the movement of the moving contact assembly 5 is introduced:

[0090] like Fig.10 As shown, at the initial stage of arc generation, the distance between the moving contact 51 of the moving contact assembly 5 and the static contact 41 of the static contact assembly 4 is relatively close, and the arc is relatively short at this time. It can move quickly toward the first arc extinguishing grid 13 under the blowing of the airflow generated by the first mounting seat 12 and the action of the magnetic field provided by the magnetizing component 14.

[0091] As the moving contact assembly 5 continues to move, Fig.11As shown, the moving contact 51 is located at the second position, at which time the arc is elongated, and at the same time, under the blowing of the airflow, the effect of the magnetic field and the attraction of the second arc-starting member 26, the end of the arc located on the moving contact 51 will approach the second arc-starting member 26 until at least a part of the arc jumps onto the second arc-starting member 26; the end of the arc located on the stationary contact 41 will approach the side where the first arc-extinguishing grid 13 is located along the conductive structure on the stationary contact assembly 4, thereby presenting as shown in FIG. Fig.12 In this state, the first arc extinguishing chamber 1 in the first arc extinguishing chamber 1 is convenient for cutting and extinguishing the arc. Fig.12 , the moving contact assembly 5 continues to move away from the static contact 41 and enters the second arc extinguishing chamber 21. If the arc has not been completely extinguished at this time, a part of the arc will be formed between the second arc-striking member 26 and the moving contact 51, and will quickly move toward the second arc-extinguishing grid 23 under the blowing of the airflow generated by the second mounting seat 22 in the second arc-extinguishing chamber 2, and / or under the action of the magnetic field provided by the magnetizing member 14. When the moving contact assembly 5 moves to the first position, it is farthest from the static contact 41. At this time, the moving contact is close to the first arc-striking member 25. The arc will jump from the moving contact to the first arc-striking member 25 under the blowing of the airflow, the action of the magnetic field and the attraction of the first arc-striking member 25, so that the multiple second arc-extinguishing grids 23 in the second arc-extinguishing chamber 2 can cut and extinguish the arc.

[0092] An embodiment of the present application further provides a circuit breaker, which includes the above-mentioned contact arc extinguishing system.

[0093] The circuit breaker provided in the embodiment of the present application adopts the above-mentioned contact arc extinguishing system. When the static contact assembly 4 and the moving contact assembly 5 are disconnected and an arc is generated, the generated arc will move toward the multiple first arc extinguishing grids 13 in the first arc extinguishing chamber 1 at the initial stage of disconnection to be cooled and extinguished; if the arc cannot be extinguished at the initial stage of disconnection, as the moving contact assembly 5 moves away from the static contact assembly 4, the arc will be elongated and divided into two small arcs, and the two small arcs will respectively move toward the multiple first arc extinguishing grids 13 in the first arc extinguishing chamber 1 and the multiple second arc extinguishing grids 23 in the second arc extinguishing chamber 2 to be cooled and extinguished respectively. Therefore, compared with the arc extinguishing chamber in the related art, the scheme of the embodiment of the present application, on the one hand, realizes the effective use of the arc extinguishing grid (i.e., the first arc extinguishing grid 13) at the bottom of the arc extinguishing chamber, improves the space utilization rate of the limited arc extinguishing space in the circuit breaker, and improves the arc extinguishing capacity of the first arc extinguishing chamber 1; on the other hand, since the arc will be divided into two small arcs in the later stage of breaking, it can improve the arc extinguishing efficiency and arc extinguishing success rate, and improve the arc extinguishing effect. Therefore, the breaking capacity and safety performance of the circuit breaker provided by the embodiment of the present application are improved.

[0094] In the description of the present application, 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 application 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 application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0095] The above description is only for the purpose of facilitating those skilled in the art to understand the technical solution of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A contact arc extinguishing system, characterized in that: The contact arc extinguishing system comprises a first arc extinguishing chamber (1), a second arc extinguishing chamber (2), an insulating mounting member (3) and a stationary contact assembly (4); The first arc-extinguishing chamber (1) and the second arc-extinguishing chamber (2) are respectively located on both sides of the insulating mounting member (3); a first arc-extinguishing chamber (1) is formed inside the first arc-extinguishing chamber (1), and a second arc-extinguishing chamber (21) is formed inside the second arc-extinguishing chamber (2); a portion of the first arc-extinguishing chamber (1) passes through the insulating mounting member (3) so that the first arc-extinguishing chamber (11) is connected to the second arc-extinguishing chamber (21); The stationary contact assembly (4) is located on a side of the insulating mounting member (3) away from the second arc extinguishing chamber (2), and is located between the first arc extinguishing chamber (1) and the insulating mounting member (3); the stationary contact point (41) of the stationary contact assembly (4) is located at the bottom (111) of the first arc extinguishing chamber (11); and the bottom (111) of the first arc extinguishing chamber (11) is the portion of the first arc extinguishing chamber (11) away from the second arc extinguishing chamber (21).

2. The contact arc extinguishing system according to claim 1, characterized in that: The first arc extinguishing chamber (1) comprises a first mounting seat (12) and a plurality of first arc extinguishing grids (13) mounted on the first mounting seat (12), the first mounting seat (12) having the first arc extinguishing cavity (11), and the first mounting seat (12) forms a first opening (125) at the top (112) of the first arc extinguishing cavity (11), the first opening (125) is connected to the first arc extinguishing cavity (11), and the top (112) of the first arc extinguishing cavity (11) is opposite to the bottom (111); The insulating mounting member (3) is provided with an escape opening (31), and the first mounting seat (12) passes through the escape opening (31) so that the first opening (125) is connected to the second arc extinguishing chamber (21).

3. The contact arc extinguishing system according to claim 2, characterized in that: The first mounting seat (12) comprises an inner frame portion (121), a bearing portion (122) and a first mounting portion (123). The inner frame portion (121) encloses the first arc-extinguishing chamber (11) and the first opening (125); The bearing portion (122) is connected to the outer wall of the inner frame portion (121) and is used to sequentially bear the static contact assembly (4) and the insulating mounting member (3); a distance is provided between the bearing portion (122) and the first opening (125) along a first set direction, and the first set direction is a direction in which the top (112) and the bottom (111) of the first arc extinguishing chamber (11) are opposite to each other; The first mounting portion (123) is connected to the outer wall of the inner frame portion (121) and is located on a side of the bearing portion (122) away from the first opening (125); the first mounting portion (123) is used to form a plurality of grid plate mounting grooves (1231) to respectively accommodate the plurality of first arc-extinguishing grid plates (13).

4. The contact arc extinguishing system according to claim 3, characterized in that: The inner frame portion (121) comprises a U-shaped plate (1211) and two extension plates (1212); the plate surface of the U-shaped plate (1211) is parallel to the first set direction; the two extension plates (1212) are located on the same side of the U-shaped plate (1211) and are respectively connected to the side surfaces of the U-shaped plate (1211); the plate surfaces of the two extension plates (1212) are spaced apart and face each other, and the plate surface of each extension plate (1212) is coplanar with the plate surface of the U-shaped plate (1211); The bearing portion (122) is connected to the outer wall of the U-shaped plate (1211) close to the two extension plates (1212); The first mounting portion (123) is connected to the outer wall of the extension plate (1212).

5. The contact arc extinguishing system according to claim 3, characterized in that: The first arc extinguishing chamber (1) further comprises a magnetizing component (14), which is mounted on the first mounting seat (12) and arranged close to the static contact (41), and is used to provide a magnetic field that causes the arc to move toward the first arc extinguishing grid (13).

6. The contact arc extinguishing system according to claim 5, characterized in that: The first mounting seat (12) further comprises a second mounting portion (124), the second mounting portion (124) being connected to the outer wall of the inner frame portion (121) and being located on a side of the first mounting portion (123) away from the first arc-extinguishing grid (13), the second mounting portion (124) being used to form a magnetizing mounting groove (1241) to accommodate the magnetizing component (14).

7. The contact arc extinguishing system according to claim 2, characterized in that: The first mounting seat (12) forms a second opening (126) on one side of the first arc extinguishing chamber (11), the second opening (126) is in communication with the first arc extinguishing chamber (11) and with the first opening (125), and the second opening (126) is opposite to the plurality of first arc extinguishing grids (13); The second arc-extinguishing chamber (2) comprises a second mounting seat (22) and a plurality of second arc-extinguishing grids (23) mounted on the second mounting seat (22), the second mounting seat (22) having the second arc-extinguishing cavity (21), the second mounting seat (22) forming a third opening (24) on one side of the second arc-extinguishing cavity (21), the third opening (24) being in communication with the second arc-extinguishing cavity (21) and being opposite to the plurality of second arc-extinguishing grids (23), the third opening (24) being in communication with the second opening (126); The contact arc extinguishing system also includes a moving contact assembly (5), wherein the moving contact (51) of the moving contact assembly (5) can extend into the first arc extinguishing chamber (11) and the second arc extinguishing chamber (21) through the second opening (126) and the third opening (24), and can move within the first arc extinguishing chamber (11) and the second arc extinguishing chamber (21) to approach or move away from the static contact (41).

8. The contact arc extinguishing system according to claim 7, characterized in that: The insulating mounting member (3) comprises a first insulating portion (32) and a second insulating portion (33), and the avoidance opening (31) is located on the first insulating portion (32); The first insulating portion (32) is sandwiched between the first arc extinguishing chamber (1) and the stationary contact assembly (4), and at least partially wraps a portion of the stationary contact assembly (4) located outside the first arc extinguishing chamber (1); The second insulating portion (33) is vertically arranged on the first insulating portion (32), and at least a portion of the second insulating portion (33) is located on a side of the plurality of second arc-extinguishing grids (23) away from the moving contact assembly (5).

9. The contact arc extinguishing system according to claim 7, characterized in that: The plurality of second arc-extinguishing grid pieces (23) are arranged in parallel and at intervals, and the extension direction of each second arc-extinguishing grid piece (23) is such that the further away from the third opening (24), the further away from the first arc-extinguishing chamber (1).

10. The contact arc extinguishing system according to claim 9, characterized in that: The included angle between the extension direction of each second arc-extinguishing grid piece (23) and a second set direction is less than or equal to 5°, and the second set direction is the direction in which the third opening (24) and the second arc-extinguishing grid piece (23) are opposite.

11. The contact arc extinguishing system according to claim 7, characterized in that: The second arc-extinguishing chamber (2) further comprises at least one of a first arc-striking member (25) and a second arc-striking member (26); The first arc-starting member (25) is located on a side of the plurality of second arc-extinguishing grids (23) away from the first arc-extinguishing chamber (1), and at least a portion of the first arc-starting member (25) is located in the second arc-extinguishing chamber (21), wherein when the moving contact assembly (5) is located at a first position, the first arc-starting member (25) is adjacent to the moving contact (51) and has a gap therebetween, and the first position is the position where the moving contact assembly (5) is farthest from the static contact (41); The second arc-striking member (26) is located on a side of the plurality of second arc-extinguishing grids (23) close to the first arc-extinguishing chamber (1), and at least a portion of the second arc-striking member (26) extends into the first arc-extinguishing chamber (11) through the first opening (125), wherein when the moving contact assembly (5) is located at a second position, the second arc-striking member (26) is adjacent to and spaced from the moving contact point (51), and the second position is the position of the moving contact assembly (5) when it passes through the first opening (125).

12. A circuit breaker, characterized in that: The circuit breaker comprises the contact arc extinguishing system according to any one of claims 1-11.

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