Arc extinguishing system and circuit breaker

Abstract

The invention relates to the technical field of electrical switches, in particular to an arc extinguishing system and a circuit breaker. The arc extinguishing system comprises an arc extinguishing chamber assembly and a contact assembly. Wherein the arc extinguish chamber assembly comprises two arc isolating parts which are arranged at an interval and a grid plate group which is arranged between the two arc isolating parts, the two arc isolating parts and the grid plate group are encircled to form a cavity, and arc isolating areas are arranged on the outer side surfaces, far away from the cavity, of the arc isolating parts; the contact assembly comprises a main contact, an arc contact and a static contact assembly. The end, provided with the first movable contact, of the main contact moves in the arc isolation area, and the end, provided with the second movable contact, of the arc contact extends into the cavity and moves between the two arc isolation parts. In the arc extinguishing system provided by the invention, the main contact and the arc contact are respectively isolated in the independent areas, the charged particles and the main contact can be isolated, the charged particles are prevented from overflowing to the main contact from the source, and the current breaking capacity of the arc extinguishing system is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical switches, and in particular to an arc extinguishing system and a circuit breaker. Background Art

[0002] The arc extinguishing system is one of the key structures of an electrical switch. Usually, the arc extinguishing system includes the main contact, the static contact and the arc extinguishing chamber. When the main contact and the static contact are disconnected, an arc will be generated. The arc extinguishing grid installed in the arc extinguishing chamber needs to be used to cut the generated arc to extinguish the arc. When the moving and static contacts of existing products are separated, the arc will generate high temperature, causing the internal gas to carry some charged particles and scatter in the arc extinguishing chamber, and even transfer to the main contact, which may cause the main contact to be broken down in severe cases. Summary of the invention

[0003] One object of the present invention is to provide an arc extinguishing system to solve the technical problem in the prior art that charged particles may be transferred to the main contacts, which may cause the main contacts to be broken down in serious cases.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] An arc extinguishing system, comprising:

[0006] The arc extinguishing chamber assembly comprises two arc-isolating parts arranged at intervals and a grid plate group arranged between the two arc-isolating parts, the two arc-isolating parts and the grid plate group are arranged to form a cavity, and an arc isolation area is arranged on the outer side of the arc-isolating part away from the cavity;

[0007] A contact assembly comprises a main contact, an arc contact and a stationary contact assembly; the main contact has one end with a first moving contact which moves in the arc isolation zone, the arc contact has one end with a second moving contact which extends into the cavity and moves between the two arc isolation parts, the first moving contact and the second moving contact can respectively contact or separate from the stationary contact assembly.

[0008] Further, any one of the arc isolation parts comprises a detachably connected grid plate side plate and an arc isolation side plate, and the grid plate group is arranged between the two grid plate side plates;

[0009] A base is connected between the two arc-isolating side plates.

[0010] Further, any one of the arc isolation parts further comprises a gas producing member, and the gas producing member is arranged on the inner side wall of the corresponding grid side plate; the grid side plate, the arc isolation side plate and the gas producing member are connected to form the arc isolation zone;

[0011] The gas producing member is provided with a fixing groove, and one end of the arc-isolating side plate close to the grid plate side plate is inserted into the corresponding fixing groove.

[0012] Furthermore, the length of the arc contact is greater than that of the main contact, and one end of the arc contact having the second moving contact extends between the two gas producing parts.

[0013] Furthermore, the stationary contact assembly further comprises a stationary contact support and a stationary contact connecting plate, the stationary contact connecting plate is provided with a first stationary contact and a second stationary contact, the first moving contact and the second moving contact can respectively contact or separate with the first stationary contact and the second stationary contact;

[0014] The stationary contact connecting plate and the base are both mounted on the stationary contact support.

[0015] Further, a first static contact plate is provided on the static contact connecting plate, and the first static contact point is provided on the first static contact plate; a touch plate slot is provided at one end of at least one arc-isolating side plate close to the base, and the first static touch plate is clamped in the touch plate slot;

[0016] And / or, a slider is provided on the outer end surface of the base, a slide groove is provided on the static contact support, and the slider is arranged in the slide groove;

[0017] And / or, a limiting plate is provided at one end of the base away from the arc isolation side plate, a limiting groove is provided on the static contact support, and the limiting plate is arranged in the limiting groove.

[0018] Furthermore, the contact assembly also includes an insulating spacer and a belly insulating member;

[0019] The two opposite end surfaces of the insulating spacer are respectively in contact with the main contact and the arc contact; the end of the arc isolation side plate away from the grid side plate is provided with a first arc surface; the distance between the insulating spacer and the first arc surface is greater than or equal to 0.1 mm and less than or equal to 2 mm;

[0020] The belly insulating member is arranged at the middle position of the arc contact, and the belly insulating member is arranged in the cavity.

[0021] Further, the contact assembly further comprises a rotating shell, the rotating shell comprising a connecting shell and a rotating shaft, one end of the main contact away from the first moving contact and one end of the arc contact away from the second moving contact are installed in the connecting shell, and the other end of the main contact and the other end of the arc contact extend out of the connecting shell; the connecting shell can drive the main contact and the arc contact to rotate around the rotation center of the rotating shaft;

[0022] A second arc-shaped surface is arranged on the outer wall surface of the connecting shell close to the arc-extinguishing chamber assembly, and a first arc-shaped surface is arranged on the end of the arc-isolating portion away from the grid group, and the centers of the second arc-shaped surface and the first arc-shaped surface coincide with the axis of the rotating shaft; a distance between the second arc-shaped surface and the first arc-shaped surface is greater than or equal to 0.1 mm and less than or equal to 2 mm.

[0023] Furthermore, the connecting shell includes two rotating side plates and a rotating bottom plate and a limiting wall connected between the two rotating side plates; a rotating shaft is respectively arranged on the outer side surface of the two rotating side plates; one side of the limiting wall is connected to the rotating bottom plate, and the other side of the limiting wall can abut against the main contact and the arc contact; the second arc-shaped surface is the outer wall surface of the limiting wall.

[0024] Another object of the present invention is to provide a circuit breaker comprising the arc extinguishing system described in any one of the above embodiments.

[0025] Beneficial effects of the present invention:

[0026] The present invention provides an arc extinguishing system and a circuit breaker, wherein the arc extinguishing system comprises an arc extinguishing chamber assembly and a contact assembly; wherein the arc extinguishing chamber assembly comprises two arc isolation parts arranged at intervals and a grid plate group arranged between the two arc isolation parts, the two arc isolation parts and the grid plate group are arranged to form a cavity, and the arc isolation part is located on the outside of the cavity and is provided with an arc isolation zone; the contact assembly comprises a main contact, an arc contact and a stationary contact assembly; one end of the main contact having a first moving contact moves in the arc isolation zone, and one end of the arc contact having a second moving contact extends into the cavity and moves between the two arc isolation parts, and the main contact and the arc contact can contact or separate from the stationary contact assembly.

[0027] In the arc extinguishing system provided in the present application, the main contact is mainly responsible for conducting current, and the arc contact is mainly responsible for striking the arc; the main contact and the arc contact are respectively isolated in independent areas, which can isolate the charged particles from the main contact from the source, and prevent the charged particles from spilling onto the main contact, thereby improving the ability of the arc extinguishing system to interrupt current. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific implementation methods of the present invention 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 present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 A schematic diagram of the three-dimensional structure of an arc extinguishing system (excluding a rotating shell) provided in an embodiment of the present invention;

[0030] Figure 2 A schematic diagram of the three-dimensional structure of an arc extinguishing chamber assembly provided in an embodiment of the present invention;

[0031] Figure 3 A schematic diagram of the connection structure between the arc isolation portion and the stationary contact support provided in an embodiment of the present invention;

[0032] Figure 4 A schematic diagram of the connection structure between the arc-isolating side plate and the base provided in an embodiment of the present invention;

[0033] Figure 5 A schematic diagram of the structure of a contact assembly provided by an embodiment of the present invention;

[0034] Figure 6 A simplified structural diagram of the positional relationship between the insulating spacer and the arc-isolating side plate in the arc-extinguishing system provided by an embodiment of the present invention when the main contact and the stationary contact assembly are in the disconnected state;

[0035] Figure 7 A simplified structural diagram of the positional relationship between the insulating spacer and the arc-isolating side plate in the arc-extinguishing system provided by an embodiment of the present invention when the main contact and the stationary contact assembly are in a closed state;

[0036] Figure 8 A schematic diagram of the positional relationship between the arc contact and the moving arc-starting plate provided in an embodiment of the present invention;

[0037] Fig. 9 A schematic diagram of the connection structure between the arc contact and the belly insulating member provided in an embodiment of the present invention;

[0038] Fig.10 A schematic diagram of the three-dimensional structure of an arc extinguishing system (including a rotating shell) provided in an embodiment of the present invention;

[0039] Fig.11 A schematic diagram of the internal structure of a rotating shell in an arc extinguishing system provided in an embodiment of the present invention;

[0040] Fig.12 A schematic diagram of the internal structure of a rotating shell in an arc extinguishing system provided in another embodiment of the present invention;

[0041] Fig.13 A schematic diagram of the internal structure of a rotating shell in an arc extinguishing system provided in another embodiment of the present invention;

[0042] Fig.14 A schematic diagram of the structure of the arc extinguishing system provided by an embodiment of the present invention when the connecting housing is rotated until the arc contact just contacts the static contact;

[0043] Fig.15 A schematic diagram of the structure of the arc extinguishing system provided by an embodiment of the present invention when the connecting housing is rotated until the main contact contacts the static contact;

[0044] Fig.16A schematic diagram of the three-dimensional structure of a circuit breaker provided in an embodiment of the present invention.

[0045] icon:

[0046] 1-arc extinguishing chamber assembly; 11-arc isolating part; 111-grid side plate; 112-arc isolating side plate; 1121-touch plate slot; 1122-first arc surface; 113-gas producing part; 1131-fixing slot; 12-grid group; 13-cavity; 14-arc isolation area; 15-base; 151-slider; 152-limiting plate; 16-moving arc-starting plate; 161-extension plate; 17-static arc-starting plate;

[0047] 2-contact assembly; 21-main contact; 211-first moving contact; 22-arc contact; 221-second moving contact; 222-connecting boss; 23-stationary contact assembly; 231-stationary contact support; 2311-slide groove; 2312-limiting groove; 232-stationary contact connecting plate; 2321-first stationary contact; 2322-second stationary contact; 2323-first stationary contact plate; 24-rotating shell; 241-connecting shell; 2411-limiting wall; 24111-second arc surface; 2412-rotating side plate; 2413-rotating bottom plate; 242-rotating shaft; 25-first elastic member; 26-second elastic member; 27-contact rotating shaft; 28-insulating spacer; 29-abdominal insulating member. DETAILED DESCRIPTION

[0048] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] It should be noted that in the description of the present invention, 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 limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0050] It should be noted that in the description of the present invention, the terms "connection" and "installation" 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 directly connected or connected through an intermediate medium; it can be a mechanical connection or an electrical connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] In one aspect, an embodiment of the present invention provides an arc extinguishing system, referring to Figure 1 , the arc extinguishing system includes:

[0052] The arc extinguishing chamber assembly 1 comprises two arc-isolating portions 11 arranged at intervals and a grid plate group 12 arranged between the two arc-isolating portions 11. The two arc-isolating portions 11 and the grid plate group 12 surround a cavity 13. An arc isolation area 14 is arranged on the outer side of the arc-isolating portion 11 away from the cavity 13.

[0053] The contact assembly 2 includes a main contact 21, an arc contact 22 and a stationary contact assembly 23; the main contact 21 has one end of a first moving contact 211 that moves in the arc isolation zone 14, and the arc contact 22 has one end of a second moving contact 221 that extends into the cavity 13 and moves between the two arc isolation parts 11, and the first moving contact 211 and the second moving contact 221 can respectively contact or separate from the stationary contact assembly 23.

[0054] In the arc extinguishing system provided in the present application, the main contact 21 is mainly responsible for conducting current, and the arc contact 22 is mainly responsible for striking the arc; when the main contact 21 and the stationary contact assembly 23 are disconnected, the generated arc is guided into the cavity 13 by the arc contact 22, and the generated arc is cut by the grid group 12; the main contact 21 and the arc contact 22 are respectively isolated in independent areas, which can isolate the charged particles and the main contact 21, and avoid the charged particles from spilling onto the main contact 21 from the source, thereby improving the ability of the arc extinguishing system to break the current.

[0055] Optionally, the number of the main contacts 21 may be one or more. When the number of the main contacts 21 is one, one end of the main contact 21 having the first moving contact 211 is arranged in the arc isolation zone 14 on one of the arc isolation parts 11. When the number of the main contacts 21 is multiple, the multiple main contacts 21 may all be arranged on the same side of the arc contact 22. At this time, the multiple main contacts 21 have one end of the first moving contact 211 arranged in the same arc isolation zone 14; in addition, the multiple main contacts 21 may be divided into two groups of main contact groups respectively arranged on both sides of the arc contact 22, and the two groups of main contact groups correspond to the two arc isolation parts 11 respectively. Exemplarily, in this embodiment, the number of the main contacts 21 is four, and two main contacts 21 are respectively arranged on both sides of the arc contact 22.

[0056] Reference Figure 2Any arc-isolating portion 11 includes a detachably connected grid plate side plate 111 and an arc-isolating side plate 112, the grid plate group 12 is arranged between the two grid plate side plates 111; a base 15 is connected between the two arc-isolating side plates 112. Optionally, the base 15 can be fixed between the two arc-isolating side plates 112 by fasteners; or, the base 15 and the two arc-isolating side plates 112 are integrally formed.

[0057] Reference Figure 2 and Figure 3 and Figure 4 Any arc-isolating portion 11 also includes a gas-producing component 113, which is arranged on the inner wall of the corresponding grid side plate 111; the grid side plate 111, the arc-isolating side plate 112 and the gas-producing component 113 are connected to form an arc isolation zone 14; a fixing groove 1131 is arranged on the gas-producing component 113, and one end of the arc-isolating side plate 112 close to the grid side plate 111 is inserted into the corresponding fixing groove 1131.

[0058] In other embodiments, the arc-isolating side plate 112 and the gas-generating member 113 may be provided as an integrally formed structure; in this embodiment, the base 15 may not be provided.

[0059] In this embodiment, the length of the arc contact 22 is greater than that of the main contact 21, and one end of the arc contact 22 having a second moving contact 221 extends between the two gas producing parts 113; the above arrangement enables the generated arc to be cut quickly, thereby improving the arc extinguishing performance of the system.

[0060] Furthermore, the stationary contact assembly 23 also includes a stationary contact support 231 and a stationary contact connecting plate 232, and the stationary contact connecting plate 232 is provided with a first stationary contact 2321 and a second stationary contact 2322, and the first moving contact 211 and the second moving contact 221 can contact or separate with the first stationary contact 2321 and the second stationary contact 2322 respectively; the stationary contact connecting plate 232 and the base 15 are both installed on the stationary contact support 231.

[0061] Specifically, a first static contact plate 2323 is provided on the static contact connecting plate 232, and a first static contact point 2321 is provided on the first static contact plate 2323; a touch plate clamping groove 1121 is provided at one end of at least one arc-isolating side plate 112 close to the base 15, and the first static contact plate 2323 is clamped in the touch plate clamping groove 1121;

[0062] And / or, a slider 151 is provided on the outer end surface of the base 15, a slide groove 2311 is provided on the static contact support 231, and the slider 151 is arranged in the slide groove 2311; illustratively, a dovetail-shaped protrusion is provided on the outer end surface of the base 15 away from the arc isolation side plate 112, and the two ends of the dovetail-shaped protrusion protrude from the two opposite outer side walls of the base 15, so that a triangular slider 151 is formed on the outer end surface of the base 15, and the shape of the slide groove 2311 is adapted to the shape of the slider 151;

[0063] And / or, a limiting plate 152 is disposed at one end of the base 15 away from the arc isolation side plate 112 , a limiting groove 2312 is disposed on the static contact support 231 , and the limiting plate 152 is disposed in the limiting groove 2312 .

[0064] by Figure 3 Taking the shown orientation as an example, in the above structure, the slider 151 and the slide groove 2311 cooperate with each other to limit the base 15 from moving in the up and down and left and right directions relative to the static contact support 231; the first static contact plate 2323 and the touch plate slot 1121 cooperate with each other to limit the base 15 from moving in the front and back directions relative to the static contact support 231; the setting of the limit plate 152 can, on the one hand, improve the structural strength of the base 15, and on the other hand, serve as a reminder. During installation, align the slider 151 with the slide groove 2311 and push it in until the limit plate 152 abuts against the bottom of the limit groove 2312, which means that the base 15 is installed in place.

[0065] Reference Figure 3 and Figure 4 In this embodiment, the base 15 and the two arc-isolating side plates 112 are integrally formed; the static contact support 231 includes a static contact mounting portion and an arc-isolating side plate mounting portion, wherein the static contact connecting plate 232 is connected to the static contact mounting portion, and the base 15 is connected to the arc-isolating side plate mounting portion; the static contact connecting plate 232 is provided with one end of the first static contact plate 2323 arranged between the static contact mounting portion and the arc-isolating side plate 112.

[0066] Reference Figure 5 The second static contact 2322 is disposed between the two gas generating parts 113. The contact assembly 2 further comprises a static arc-starting plate 17, which is disposed between the static contact connecting plate 232 and the grid group 12 and is used to introduce the arc into the arc extinguishing chamber.

[0067] Reference Figure 6 and Figure 7 The contact assembly 2 further includes an insulating spacer 28, which is disposed between the main contact 21 and the arc contact 22, and its two opposite end surfaces respectively abut against the main contact 21 and the arc contact 22. In this embodiment, the main contacts 21 are disposed on both opposite sides of the arc contact 22, and correspondingly, an insulating spacer 28 is disposed on both opposite sides of the arc contact 22.

[0068] Furthermore, a first arc-shaped surface 1122 is provided at one end of the arc-isolating side plate 112 away from the grid side plate 111, and the spacing distance between the first arc-shaped surface 1122 and the insulating spacer 28 is greater than or equal to 0.1 and less than or equal to 2 mm; when the insulating spacer 28 is not parallel to the first arc-shaped surface 1122, the spacing distance between the two is the minimum distance between the two. The setting of the first arc-shaped surface 1122 can ensure that the arc-isolating side plate 112 will not hinder the rotation of the insulating spacer 28 during the rotation of the main contact 21 and the arc contact 22; the minimum spacing between the insulating spacer 28 and the arc-isolating side plate 112 is set to 0.1 mm, which can accommodate the processing and assembly errors of each workpiece without hindering the relative movement of the two; the maximum spacing between the insulating spacer 28 and the arc-isolating side plate 112 is set to 2 mm, which can prevent a very small amount of charged particles from overflowing from between the arc-isolating side plate 112 and the arc contact 22, and then falling to the side of the main contact 21, further improving the safety of the arc extinguishing system when in use. In other embodiments, the insulating spacer 28 and the first arc-shaped surface 1122 may also be configured to be in a mutually abutting structure, but this structure requires high precision in processing and assembly and is likely to affect the rotation of the moving contact, and is therefore not preferred.

[0069] Optionally, the end surface of the insulating spacer 28 close to the first arc-shaped surface 1122 is arc-shaped.

[0070] Optionally, the insulating spacer 28 is connected to the main contact 21 or the arc contact 22; in this embodiment, the insulating spacer 28 is connected to the arc contact 22, and the two can be connected through an axial hole or a slot block structure or fasteners such as screws, which is not limited here.

[0071] Reference Figure 8 The arc extinguishing chamber assembly 1 also includes a moving arc-striking plate 16, and the moving arc-striking plate 16 and the static contact assembly 23 are respectively arranged at opposite ends of the cavity 13; the moving arc-striking plate 16 includes a connecting piece and an extending piece 161, wherein the connecting piece is fixed between the two grid side plates 111, and the extending piece 161 extends into the cavity 13; the extending piece 161 has a bending portion at one end away from the connecting piece, and the second moving contact 221 moves between the bending portion and the static contact assembly 23 (specifically, the second static contact 2322). The arrangement of the moving arc-striking plate 16 can prevent a small amount of charged particles from overflowing from the opening of the cavity 13 away from the static contact assembly 23.

[0072] The contact assembly 2 has a closed state in which the main contact 21 and the stationary contact assembly 23 are in contact, an open state in which the main contact 21 and the stationary contact assembly 23 are separated, and an action state for switching between the closed state and the open state. Figure 8 Schematic diagram of the positional relationship between the arc contact 22 and the moving arc-starting plate 16 when the contact assembly 2 is in the disconnected state; Figure 8When the contact assembly 2 is in the disconnected state, an arc-striking inclined surface is provided at one end of the arc contact 22 away from the second moving contact 221, and the arc-striking inclined surface is parallel to the bent portion.

[0073] In the above structure, the arc isolation part 11, the grid group 12, the moving arc-starting plate 16, the main contact 21, the static contact assembly 23 and the insulating spacer 28 are arranged to form a relatively closed space. The charged particles generated when the current is disconnected are isolated in the above space and are difficult to spread to the outside, thereby greatly improving the arc extinguishing ability of the arc extinguishing system.

[0074] Reference Fig. 9 The contact assembly 2 further includes a belly insulating member 29, which is disposed at the middle position of the arc contact 22 and is disposed in the cavity 13. In this embodiment, the belly insulating member 29 is U-shaped, half of which is wrapped around the middle position of the arc contact 22 and is fixed by the shaft hole.

[0075] Optionally, the distance between the side surface of the abdominal insulating member 29 and the inner wall of the cavity 13 is greater than or equal to 0.1 mm and less than or equal to 2 mm.

[0076] Reference Fig. 9 and Fig.11 The contact assembly 2 further includes a rotating shell 24, which includes a connecting shell 241 and a rotating shaft 242. One end of the main contact 21 away from the first moving contact 211 and one end of the arc contact 22 away from the second moving contact 221 are installed in the connecting shell 241, and the other end of the main contact 21 and the other end of the arc contact 22 extend out from the connecting shell 241; the connecting shell 241 can drive the main contact 21 and the arc contact 22 to rotate around the rotation center of the rotating shaft 242;

[0077] A second arc surface 24111 is provided on the outer wall surface of the connecting shell 241 close to the arc extinguishing chamber assembly 1, and the second arc surface 24111 is provided between the arc contact 22 and the static contact assembly 23; a first arc surface 1122 is provided at one end of the arc isolating portion 11 away from the grid group 12, and the centers of the second arc surface 24111 and the first arc surface 1122 coincide with the axis of the rotating shaft 242; the spacing between the second arc surface 24111 and the first arc surface 1122 is greater than or equal to 0.1 mm and less than or equal to 2 mm. The minimum spacing between the second arc surface 24111 and the first arc surface 1122 is set to 0.1 mm, which can accommodate the processing and assembly errors of each workpiece without hindering the relative movement between the two; the maximum spacing between the second arc surface 24111 and the first arc surface 1122 is set to 2 mm, which can prevent a very small amount of charged particles from overflowing from between the second arc surface 24111 and the first arc surface 1122. The first curved surface 1122 and the second curved surface 24111 cooperate to make the cavity 13 a relatively closed space, further isolating the charged particles in the cavity 13, preventing the arc from overflowing and entering the arc isolation area 14 and other positions, while maintaining the air pressure in the cavity 13, so that the arc moves into the arc extinguishing chamber. In other embodiments, the second curved surface 24111 and the first curved surface 1122 can also be set as an abutting structure, but this abutting structure is not preferred.

[0078] In this embodiment, the connecting shell 241 includes two rotating side plates 2412 and a rotating bottom plate 2413 and a limiting wall 2411 connected between the two rotating side plates 2412; a rotating shaft 242 is respectively arranged on the outer sides of the two rotating side plates 2412; one side of the limiting wall 2411 is connected to the rotating bottom plate 2413, and the other side of the limiting wall 2411 can abut against the main contact 21 and the arc contact 22; the second arc-shaped surface 24111 is the outer wall surface of the limiting wall 2411.

[0079] The structure of the contact assembly 2 in this embodiment is described in detail below:

[0080] Continue to refer to Figures 9 to 11 The contact assembly 2 also includes a first elastic member 25; the main contact 21 and the arc contact 22 are installed in the connecting shell 241, and the two ends of the first elastic member 25 are respectively connected to the arc contact 22 and the connecting shell 241, and the arc contact 22 can abut against the limiting wall 2411 on the connecting shell 241 under the action of the first elastic member 25; the connecting shell 241 can drive the main contact 21 and the arc contact 22 to rotate around the rotation center of the rotating shaft 242, and the arc contact 22 and the main contact 21 can contact with the static contact assembly 23 successively, and the main contact 21 and the arc contact 22 can be separated from the static contact assembly 23 successively.

[0081] Specifically, the first elastic member 25 is a tension spring; the arc contact 22 is rotatably connected to the connection housing 241 through the contact shaft 27, a connection boss 222 is provided on the arc contact 22, and the two ends of the first elastic member 25 are respectively hooked on the connection boss 222 and the connection housing 241; the first elastic member 25 is used to apply elastic force to the arc contact 22 to rotate in the direction close to the stationary contact assembly 23, and the limiting wall 2411 can limit the rotation position of the arc contact 22 relative to the connection housing 241. In other embodiments, the connection boss 222 can also be replaced by a connection hole, as long as the structure can meet the requirements of the tension spring hooking.

[0082] In this embodiment, the connecting boss 222 is disposed between the contact shaft 27 and the second moving contact 221, and the first elastic member 25 is disposed on a side of the arc contact 22 close to the stationary contact assembly 23. Fig.12 In another embodiment, the first elastic member 25 may also be disposed on a side of the arc contact 22 away from the stationary contact assembly 23, and the contact shaft 27 is disposed between the connecting boss 222 and the second moving contact 221. Fig.13 In another embodiment, the first elastic member 25 can also be configured as a compression spring, and the compression spring and the second moving contact 221 are respectively located on opposite sides of the contact shaft 27, and the arc contact 22 and the connecting housing 241 can be respectively provided with a first spring block and a second spring block, and the two ends of the compression spring are respectively sleeved on the first spring block and the second spring block, and the two end faces of the compression spring are respectively abutted against the arc contact 22 and the connecting housing 241. In addition, the first elastic member 25 can also be configured in the form of a torsion spring. The above configurations can realize that the first elastic member 25 applies an elastic force to the arc contact 22 having one end of the second moving contact 221 to rotate in a direction close to the stationary contact assembly 23, and will not affect the arc contact 22 from extending into the cavity 13.

[0083] In this embodiment, the contact assembly 2 further includes a second elastic member 26, the two ends of which are respectively connected to the main contact 21 and the connection housing 241, and the main contact 21 can abut against the limiting wall 2411 under the action of the second elastic member 26. Specifically, the main contact 21 is rotatably connected to the connection housing 241 through the contact shaft 27; the connection structure of the second elastic member 26 is the same as the connection structure of the first elastic member 25, which will not be repeated here. The second elastic member 26 is provided so that the moving and static contacts are in flexible contact, which can make the contact between the main contact 21 and the static contact assembly 23 more reliable on the one hand, and can avoid damage to the contact point on the other hand.

[0084] In this embodiment, the contact shaft 27 passes through the main contact 21, the arc contact 22 and the insulating spacer 28, and the two ends of the contact shaft 27 are respectively connected to the two rotating side plates 2412. The main contact 21 and the arc contact 22 have a tendency to rotate around the rotation center of the contact shaft 27 under the action of the second elastic member 26 and the first elastic member 25, respectively. The limiting wall 2411 is used to limit the extreme position of the rotation of the main contact 21 and the arc contact 22 around the contact shaft 27.

[0085] Continue to refer to Fig.11 A first curved surface 1122 is provided at one end of the arc isolation portion 11 away from the grid plate group 12. In the present embodiment, the first curved surface 1122 is specifically provided at one end of the arc isolation side plate 112 away from the grid plate side plate 111; a second curved surface 24111 is provided on the outer side of the limiting wall 2411 relative to the connecting shell 241, and the centers of the second curved surface 24111 and the first curved surface 1122 coincide with the axis of the rotating shaft 242; the distance between the second curved surface 24111 and the first curved surface 1122 is greater than or equal to 0.1 mm and less than or equal to 2 mm.

[0086] In this embodiment, the rotating shell 24 adopts an integrally formed structure to improve processing and assembly efficiency.

[0087] Analyzing the above structure, two adjacent side surfaces of the main contact 21, the insulating spacer 28 and the arc contact 22 abut against each other, and the side surfaces of the main contact 21 and the arc contact 22 close to the static contact assembly 23 can abut against the limiting wall 2411, the insulating spacer 28 and the first arc surface 1122 are separated by a set distance (greater than or equal to 0.1 mm and less than or equal to 2 mm), the second arc surface 24111 and the first arc surface 1122 are separated by a set distance (greater than or equal to 0.1 mm and less than or equal to 2 mm), and the openings at both ends of the cavity 13 are respectively provided with a moving arc-striking plate 16 and a static arc-striking plate 17; in the above structure, the cavity 13 can be regarded as a closed space, and the scattered electrons in the cavity 13 can be completely isolated in the cavity 13. At the same time, the air pressure in the cavity 13 is not easy to leak, so that the arc can move into the arc extinguishing chamber.

[0088] The movement principle of the contact assembly 2 is as follows:

[0089] Reference Fig.11 At this time, the contact assembly 2 is in the disconnected state, and the main contact 21 and the arc contact 22 abut against the limiting wall 2411 under the pulling force of the second elastic member 26 and the first elastic member 25 respectively;

[0090] Reference Fig.14 During the closing process of the moving and static contacts, the connecting housing 241 drives the main contact 21 and the arc contact 22 to rotate clockwise around the rotation center of the rotating shaft 242, and the arc contact 22 first contacts the static contact assembly 23;

[0091] Reference Fig.15 After the arc contact 22 contacts the stationary contact assembly 23, the connecting housing 241 continues to drive the main contact 21 to rotate clockwise around the rotation center of the rotating shaft 242, the arc contact 22 separates from the limiting wall 2411, and the first elastic member 25 is stretched until the main contact 21 contacts the stationary contact assembly 23; at this time, the contact assembly 2 is in a closed state;

[0092] During the process of switching the contact assembly 2 from the closed state to the open state, the connecting shell 241 drives the main contact 21 to rotate counterclockwise around the rotation center of the rotating shaft 242, and the main contact 21 is separated from the static contact assembly 23 until the arc contact 22 abuts against the limiting wall 2411 again; then, the connecting shell 241 drives the main contact 21 and the arc contact 22 to continue rotating to the open state.

[0093] When the moving and static contacts are closed, the arc contact 22 contacts the static contact assembly 23 first, and when the moving and static contacts are separated, the main contact 21 separates from the static contact assembly 23 first, thereby ensuring that the arc contact 22 can guide the arc into the cavity 13; the charged particles generated when the power is off can be completely isolated in the cavity 13, solving the problem of charged particles spilling to other electrical components from the root; the belly of the arc contact 22 is provided with a belly insulating member 29, which can prevent charged particles from breaking through the arc contact 22 and causing arc voltage to drop. Compared with the existing arc extinguishing system, the arc extinguishing system provided by the present application has the advantages of compact structure, good arc extinguishing performance, safety and reliability, and long service life.

[0094] Another aspect of the present invention provides a circuit breaker, referring to Fig.16 The circuit breaker includes the arc extinguishing system and the circuit breaker housing as described in any of the above embodiments, and the arc extinguishing system is arranged inside the circuit breaker housing. The circuit breaker provided in this embodiment includes three arc extinguishing systems; in other embodiments, the circuit breaker can be equipped with one or more arc extinguishing systems according to actual use conditions and product specifications.

[0095] The circuit breaker provided in the present application has the beneficial effects of the above-mentioned embodiments, which will not be described in detail here.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An arc extinguishing system, characterized in that: include: An arc extinguishing chamber assembly (1) comprises two arc isolation parts (11) arranged at intervals and a grid plate group (12) arranged between the two arc isolation parts (11), the two arc isolation parts (11) and the grid plate group (12) enclose a cavity (13), and an arc isolation area (14) is arranged on an outer surface of the arc isolation part (11) away from the cavity (13); A contact assembly (2) comprises a main contact (21), an arc contact (22) and a stationary contact assembly (23); the main contact (21) has one end with a first moving contact (211) which moves in the arc isolation zone (14); the arc contact (22) has one end with a second moving contact (221) which extends into the cavity (13) and moves between the two arc isolation portions (11); the first moving contact (211) and the second moving contact (221) can respectively contact or separate from the stationary contact assembly (23).

2. The arc extinguishing system according to claim 1, characterized in that: Any one of the arc isolation parts (11) comprises a detachably connected grid plate side plate (111) and an arc isolation side plate (112), and the grid plate group (12) is arranged between the two grid plate side plates (111); A base (15) is connected between the two arc-isolating side plates (112).

3. The arc extinguishing system according to claim 2, characterized in that: Any one of the arc isolation parts (11) further comprises a gas producing part (113), and the gas producing part (113) is arranged on the inner side wall of the corresponding grid side plate (111); the grid side plate (111), the arc isolation side plate (112) and the gas producing part (113) are connected to form the arc isolation zone (14); The gas generating member (113) is provided with a fixing groove (1131), and one end of the arc-isolating side plate (112) close to the grid plate side plate (111) is inserted into the corresponding fixing groove (1131).

4. The arc extinguishing system according to claim 3, characterized in that: The length of the arc contact (22) is greater than that of the main contact (21), and one end of the arc contact (22) having a second movable contact (221) extends between the two gas generating parts (113).

5. The arc extinguishing system according to claim 2, characterized in that: The stationary contact assembly (23) further comprises a stationary contact support (231) and a stationary contact connecting plate (232); a first stationary contact (2321) and a second stationary contact (2322) are arranged on the stationary contact connecting plate (232); the first moving contact (211) and the second moving contact (221) can respectively contact or separate with the first stationary contact (2321) and the second stationary contact (2322); The stationary contact connecting plate (232) and the base (15) are both mounted on the stationary contact support (231).

6. The arc extinguishing system according to claim 5, characterized in that: A first static contact plate (2323) is arranged on the static contact connecting plate (232), and the first static contact point (2321) is arranged on the first static contact plate (2323); a touch plate clamping groove (1121) is arranged at one end of at least one arc-isolating side plate (112) close to the base (15), and the first static contact plate (2323) is clamped in the touch plate clamping groove (1121); And / or, a slider (151) is provided on the outer end surface of the base (15), a slide groove (2311) is provided on the static contact support (231), and the slider (151) is arranged in the slide groove (2311); And / or, a limiting plate (152) is provided at one end of the base (15) away from the arc isolation side plate (112), a limiting groove (2312) is provided on the static contact support (231), and the limiting plate (152) is arranged in the limiting groove (2312).

7. The arc extinguishing system according to claim 2, characterized in that: The contact assembly (2) further comprises an insulating spacer (28) and a belly insulating member (29); The two opposite end surfaces of the insulating spacer (28) are respectively in contact with the main contact (21) and the arc contact (22); a first arc-shaped surface (1122) is provided at one end of the arc-isolating side plate (112) away from the grid side plate (111); and a distance between the insulating spacer (28) and the first arc-shaped surface (1122) is greater than or equal to 0.1 mm and less than or equal to 2 mm; The belly insulating member (29) is arranged at a middle position of the arc contact (22), and the belly insulating member (29) is arranged in the cavity (13).

8. The arc extinguishing system according to claim 1, characterized in that: The contact assembly (2) further comprises a rotating shell (24), the rotating shell (24) comprising a connecting shell (241) and a rotating shaft (242); one end of the main contact (21) away from the first moving contact (211) and one end of the arc contact (22) away from the second moving contact (221) are installed in the connecting shell (241); the other end of the main contact (21) and the other end of the arc contact (22) extend out from the connecting shell (241); the connecting shell (241) can drive the main contact (21) and the arc contact (22) to rotate around the rotation center of the rotating shaft (242); A second arcuate surface (24111) is provided on the outer wall surface of the connecting shell (241) close to the arc extinguishing chamber assembly (1), and the second arcuate surface (24111) is provided between the arc contact (22) and the stationary contact assembly (23); a first arcuate surface (1122) is provided at one end of the arc isolation portion (11) away from the grid plate group (12), and the centers of the second arcuate surface (24111) and the first arcuate surface (1122) coincide with the axis of the rotating shaft (242); and a spacing between the second arcuate surface (24111) and the first arcuate surface (1122) is greater than or equal to 0.1 mm and less than or equal to 2 mm.

9. The arc extinguishing system according to claim 8, characterized in that: The connecting shell (241) comprises two rotating side plates (2412) and a rotating bottom plate (2413) and a limiting wall (2411) connected between the two rotating side plates (2412); a rotating shaft (242) is respectively arranged on the outer side surface of the two rotating side plates (2412); one side of the limiting wall (2411) is connected to the rotating bottom plate (2413), and the other side of the limiting wall (2411) can abut against the main contact (21) and the arc contact (22); the second arc-shaped surface (24111) is the outer wall surface of the limiting wall (2411).

10. A circuit breaker, characterized in that: The invention comprises an arc extinguishing system as claimed in any one of claims 1 to 9.

Images