Static contact assembly and circuit breaker

Abstract

The utility model discloses a static contact assembly and a circuit breaker, and relates to the field of electrical equipment. The static contact assembly comprises a conductive part, and a magnetic conductive structure and a static contact cover which are connected to the conductive part, the magnetic conductive structure comprises a first magnetic conductive plate and a second magnetic conductive plate which are spaced in a first direction, and the static contact cover sleeves the outer sides of the first magnetic conductive plate and the second magnetic conductive plate. The conductive part comprises a static contact, the static contact is located between the first magnetic conductive plate and the second magnetic conductive plate, and the first magnetic conductive plate and the second magnetic conductive plate are used for generating a magnetic field when the conductive part is powered on. Therefore, the electrified moving contact assembly is subjected to repulsive force for separating the moving contact assembly from the static contact, and the arc moves into the arc extinguishing chamber by utilizing the guiding effects of magnetic blow, air blow and the static contact cover, so that the arc extinguishing capability is improved. According to the static contact assembly provided by the embodiment of the invention, the circuit can be cut off and the arc can be extinguished in an extremely short time when the static contact assembly encounters a large current, and the static contact assembly has better safety.

Description

Technical Field

[0001] The present application relates to the field of electrical equipment, and in particular to a static contact assembly and a circuit breaker. Background Art

[0002] A circuit breaker refers to a switching device that can close, carry and disconnect current under normal circuit conditions, and can close, carry and disconnect current under abnormal circuit conditions within a specified time. When a short circuit occurs in a line or equipment, the circuit breaker must cut off the power supply in time. The principle of the circuit breaker in the related art is that when the current is large (reaching an abnormal level), the armature moves and then pushes the trigger mechanism to trip, and the trigger mechanism pulls the moving contact assembly and the static contact assembly apart, thereby cutting off the power supply. However, the time interval between the occurrence of large current and the separation of the static contact assembly and the moving contact assembly in the circuit breaker of the related art is still relatively long, and the energy during this period is very large, which can easily cause product damage. In addition, the movement direction of the arc generated between the moving contact and the static contact is relatively random, resulting in poor arc extinguishing effect and poor safety. Utility Model Content

[0003] The purpose of the present application is to provide a static contact assembly and a circuit breaker, which can quickly trigger power failure when a large current occurs and have a good arc extinguishing effect.

[0004] The embodiment of the present application is implemented as follows:

[0005] In a first aspect, the present application provides a static contact assembly, which is applied to a circuit breaker, and includes a conductive member, a magnetic conductive structure connected to the conductive member, and an insulating static contact cover, wherein the magnetic conductive structure includes a first magnetic conductive plate and a second magnetic conductive plate spaced apart in a first direction, the conductive member includes a static contact, the static contact is used to connect or separate with a moving contact assembly of the circuit breaker, the static contact is located between the first magnetic conductive plate and the second magnetic conductive plate, the first magnetic conductive plate and the second magnetic conductive plate are used to generate a magnetic field when the conductive member is energized, so that the energized moving contact assembly is subjected to a repulsive force tending to separate from the static contact; the static contact cover includes a first mating sleeve and a second mating sleeve, and the first mating sleeve and the second mating sleeve are respectively sleeved on the outside of the first magnetic conductive plate and the second magnetic conductive plate.

[0006] In an optional embodiment, the magnetic conductive structure further includes a connecting portion, and the first magnetic conductive plate and the second magnetic conductive plate are respectively connected to opposite ends of the connecting portion, so that the magnetic conductive structure is U-shaped.

[0007] In an optional embodiment, the conductive member has a first side and a second side opposite to each other in a second direction, the second direction being perpendicular to the first direction, the static contact is arranged on the first side of the conductive member, the conductive member is provided with a first slot and a second slot passing through the conductive member along the second direction, the connecting portion is arranged on the second side of the conductive member, and the first magnetic conductive plate and the second magnetic conductive plate respectively pass through the first slot and the second slot so as to protrude from the first side of the conductive member.

[0008] In an optional embodiment, the static touch cover also includes a seat body, the first mating sleeve and the second mating sleeve are both connected to the seat body and spaced apart from each other, the first mating sleeve forms a first slot, the second mating sleeve forms a second slot, the openings of the first slot and the second slot are both along the second direction toward the conductive part, the first slot and the second slot are respectively plugged and matched with the first magnetic conductive plate and the second magnetic conductive plate, and limit the movement of the first magnetic conductive plate and the second magnetic conductive plate toward the second side of the conductive part, and the seat body abuts against the first side of the conductive part.

[0009] In an optional embodiment, one of the first magnetic conductive plate and the first matching sleeve is provided with a first male buckle, and the other is provided with a first female buckle, and the first male buckle is engaged with the first female buckle;

[0010] One of the second magnetic conductive plate and the second matching sleeve is provided with a second male buckle, and the other is provided with a second female buckle, and the second male buckle is snap-fitted with the second female buckle.

[0011] In an optional embodiment, first limiting portions are respectively provided at opposite ends of the seat body in the first direction, the two first limiting portions protrude toward the second side of the conductive member along the first direction, and a portion of the conductive member is clamped between the two first limiting portions.

[0012] In an optional embodiment, the conductive part includes a wiring part, a transition part and a static contact part connected in sequence in a third direction, the third direction is perpendicular to the first direction and the second direction, the static contact and the magnetic conductive structure are both arranged on the static contact part, the static contact part and the wiring part are staggered in positions in the second direction, the two ends of the transition part in the second direction are respectively connected to the wiring part and the static contact part, and a second limiting part is arranged at one end of the seat body close to the wiring part, and the second limiting part abuts against the transition part.

[0013] In an optional embodiment, the static contact portion includes a U-shaped frame and a bearing portion, two ends of the U-shaped frame are connected to the transition portion, the bearing portion is connected to the inner side of the bottom of the U-shaped frame and extends toward the wiring portion, the static contact is arranged on the bearing portion, and a first card slot and a second card slot are formed between two opposite sides of the U-shaped frame and the bearing portion, and the first magnetic conductive plate and the second magnetic conductive plate are respectively plugged into and matched with the first card slot and the second card slot.

[0014] In an optional embodiment, the wiring portion is provided with a wiring hole and / or a mounting hole.

[0015] In an optional embodiment, the static touch cover is made of plastic.

[0016] In a second aspect, the present application provides a circuit breaker, comprising a base, a moving contact assembly and a stationary contact assembly of any one of the aforementioned embodiments, wherein the conductive member is connected to the base, the stationary contact cover, the first magnetic conductive plate and the second magnetic conductive plate are arranged on a side of the conductive member away from the base, and the moving contact assembly can move relative to the stationary contact assembly to connect or separate with the stationary contact.

[0017] In an optional embodiment, the circuit breaker further includes a guide plate and an arc extinguishing chamber. The arc extinguishing chamber is located on the side of the static contact assembly away from the base and is spaced apart from the static contact assembly. A guide hole is provided on the guide plate, and the arc extinguishing chamber is located between the moving contact assembly and the guide plate.

[0018] The beneficial effects of the embodiments of the present application are:

[0019] The static contact assembly of the present application includes a conductive member, a magnetic conductive structure connected to the conductive member, and an insulated static contact cover, the magnetic conductive structure includes a first magnetic conductive plate and a second magnetic conductive plate spaced in a first direction, the conductive member includes a static contact, the static contact is used to connect or separate with the moving contact assembly of the circuit breaker, the static contact is located between the first magnetic conductive plate and the second magnetic conductive plate, the first magnetic conductive plate and the second magnetic conductive plate are used to generate a magnetic field when the conductive member is energized, so that the energized moving contact assembly is subjected to a repulsive force that tends to separate it from the static contact; the static contact cover includes a first matching sleeve and a second matching sleeve, the first matching sleeve and the second matching sleeve are respectively sleeved on the outside of the first magnetic conductive plate and the second magnetic conductive plate. When using the static contact assembly provided by the present application, since the first magnetic conductive plate and the second magnetic conductive plate are provided, once a large current appears, a magnetic field can be immediately generated between the first magnetic conductive plate and the second magnetic conductive plate, and the moving contact assembly with a large current will be subjected to a large repulsive force (Ampere force) under the action of the magnetic field, forcing it to separate from the static contact. It can be seen that the static contact assembly provided by the embodiment of the present application can achieve circuit cutting in a very short time when encountering a large current. Compared with the prior art that relies on a series of momentum transmission such as the armature and the trigger mechanism to finally pull the moving contact assembly to achieve power off, it has better timeliness, so it can better avoid electrical equipment from being damaged by large currents. In addition, by setting an insulating static contact cover to wrap the first magnetic conductive plate and the second magnetic conductive plate, the arc generated between the separated static contact and the moving contact is not easily attracted to the first magnetic conductive plate and the second magnetic conductive plate. The arc can be restricted by the first matching sleeve and the second matching sleeve, and has a more certain movement direction, that is, it moves in a direction parallel to the first magnetic conductive plate and the second magnetic conductive plate, which is conducive to its movement to the arc extinguishing chamber and then being eliminated, thereby improving the arc extinguishing effect and safety. The circuit breaker provided by the embodiment of the present application includes the above-mentioned static contact assembly, and therefore also has the above-mentioned corresponding beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 This is a schematic diagram of the assembly of a static contact assembly in one embodiment of the present application;

[0022] Figure 2 This is a schematic diagram of a conductive member in an embodiment of the present application;

[0023] Figure 3 This is a schematic diagram of a magnetic conductive structure in an embodiment of the present application;

[0024] Figure 4 This is a schematic diagram of the coordination between the conductive member and the magnetic conductive structure in one embodiment of the present application;

[0025] Figure 5 This is a schematic diagram of a static touch cover in one embodiment of the present application;

[0026] Figure 6 This is a cross-sectional view of the cooperation between the static touch cover and the magnetic conductive structure in one embodiment of the present application;

[0027] Figure 7 This is a cross-sectional view of a circuit breaker in one embodiment of the present application.

[0028] Icons: 010-circuit breaker; 100-static contact assembly; 110-conductive member; 111-wiring portion; 1111-wiring hole; 1112-mounting hole; 112-transition portion; 113-static contact portion; 114-U-shaped frame; 115-bearing portion; 1151-static contact; 116-first card slot; 117-second card slot; 120-magnetic conductive structure; 121-first magnetic conductive plate; 1211-first female buckle; 122-second magnetic conductive plate; 1221-second female buckle; 123-connecting portion; 130-static contact cover; 131 - seat body; 1311- first limiting part; 1312- second limiting part; 132- first matching sleeve; 1321- first slot; 1322- first male buckle; 133- second matching sleeve; 1331- second slot; 1332- second male buckle; 200- base; 210- cover body; 220- arc extinguishing chamber; 230- guide plate; 240- support platform; 300- moving contact assembly; 310- electrical connector; 400- iron core; 500- connecting plate; 600- armature; 700- traction member; 800- trigger mechanism. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0032] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0033] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0034] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] The circuit breaker in the related art includes components such as a static contact assembly, a moving contact assembly, an iron core, an armature, and a trigger mechanism. Under normal circumstances, the static contact assembly and the moving contact assembly are connected and pass normal current. When the current is too large due to an abnormality (such as a short circuit), the iron core generates a magnetic field to cause the armature to move, and the armature triggers the trigger mechanism, which pulls the moving contact assembly to move and separate it from the static contact assembly, thereby achieving circuit breaking. However, this method has the problem of a long transmission path. The armature and some parts of the trigger mechanism will trigger the next link through movement. These movements will consume time, so there will be a problem of untimely power-off response. In the related art, it takes 6 to 12 ms from the appearance of a large current to the disconnection of the circuit. The reaction time is relatively long, and part of the arc is outside the arc extinguishing chamber, which may cause damage to electrical equipment.

[0036] To this end, the embodiments of the present application provide a static contact assembly and a circuit breaker. By setting a magnetic conductive structure, the static contact assembly can generate a repulsive force on the moving contact assembly to separate it when encountering a large current, without relying on a complex transmission link, so the power-off response is faster. The static contact cover is set to reduce the uncertainty of arc movement, which is conducive to guiding the arc to the arc extinguishing chamber and improving the arc extinguishing ability. Figure 1 This is a schematic diagram of the assembly of a static contact assembly 100 in one embodiment of the present application; Figure 2 This is a schematic diagram of a conductive member 110 in an embodiment of the present application; Figure 3 This is a schematic diagram of a magnetic conductive structure 120 in one embodiment of the present application; Figure 4 FIG. 1 is a schematic diagram of the coordination between the conductive member 110 and the magnetic conductive structure 120 in one embodiment of the present application. Figures 1 to 4 As shown, the static contact assembly 100 provided in the embodiment of the present application is applied to the circuit breaker 010, which includes a conductive member 110 and a magnetic conductive structure 120 connected to the conductive member 110. The magnetic conductive structure 120 includes a first magnetic conductive plate 121 and a second magnetic conductive plate 122 spaced apart in a first direction (the direction of arrows ab in the figure), the conductive member 110 includes a static contact 1151, the static contact 1151 is used to connect or separate with the moving contact assembly 300 of the circuit breaker 010, the static contact 1151 is located between the first magnetic conductive plate 121 and the second magnetic conductive plate 122, the first magnetic conductive plate 121 and the second magnetic conductive plate 122 are used to generate a magnetic field when the conductive member 110 is powered on, so that the powered moving contact assembly 300 (see Figure 7 ) is subjected to a repulsive force tending to separate it from the static contact 1151.

[0037] In this embodiment, the static contact assembly 100 further includes an insulating static contact cover 130, which is used to fix the magnetic conductive structure 120 on the conductive member 110, so that the position of the magnetic conductive plate relative to the conductive member 110 is stable. The static contact cover 130 can be made of plastic material, which can be burned by the electric arc to generate gas; in other embodiments, the static contact cover 130 can also be made of ceramic material.

[0038] like Figure 2 As shown, the conductive member 110 includes a wiring portion 111, a transition portion 112 and a static contact portion 113 which are sequentially connected in a third direction (the direction indicated by the arrow cd in the figure), and the conductive member 110 has a first side and a second side which are opposite in a second direction (the direction indicated by the arrow ef in the figure), and the first direction, the second direction and the third direction are perpendicular to each other. Figure 2 The upper side of the conductive member 110 is the first side, and the lower side that is not shown is the second side. The static contact 1151 is arranged on the first side of the conductive member 110, and the static contact 1151 and the magnetic conductive structure 120 are both arranged on the static contact portion 113. In this embodiment, the entire conductive member 110 is in the shape of a plate, the static contact portion 113 and the wiring portion 111 are staggered in the second direction, and the two ends of the transition portion 112 in the second direction are respectively connected to the wiring portion 111 and the static contact portion 113. The transition portion 112 has an extension in the second direction, so that the conductive member 110 is z-shaped as a whole, and the wiring portion 111 and the static contact portion 113 are in two planes of different heights. This arrangement enables the conductive member 110 to adapt to the installation position in the circuit breaker 010. In other optional embodiments, the conductive member 110 can also be in the shape of a straight strip.

[0039] In this embodiment, the wiring portion 111 is provided with a wiring hole 1111 and a mounting hole 1112. The wiring hole 1111 is used for external connection of a circuit, and the mounting hole 1112 is used for fixing the conductive member 110 to the base 200 of the circuit breaker 010 by screws.

[0040] In this embodiment, the static contact part 113 includes a U-shaped frame 114 and a bearing part 115. The two ends of the U-shaped frame 114 are connected to the transition part 112. The bearing part 115 is connected to the inner side of the bottom of the U-shaped frame 114 and extends toward the wiring part 111. The static contact 1151 is arranged on the bearing part 115. In this embodiment, the bottom of the U-shaped frame 114 is located at the end away from its opening, that is, at the end away from the transition part 112; the inner side of the bottom refers to the side facing the space enclosed by the U-shaped frame 114. A first slot 116 and a second slot 117 are formed between the two opposite sides of the U-shaped frame 114 and the bearing part 115. The first magnetic conductive plate 121 and the second magnetic conductive plate 122 of the magnetic conductive structure 120 are respectively plugged into the first slot 116 and the second slot 117.

[0041] In this embodiment, the stationary contact 1151 is a boss protruding from the surface of the bearing portion 115 , so as to facilitate abutment with the moving contact in the moving contact assembly 300 .

[0042] like Figure 3As shown, the magnetic conductive structure 120 in this embodiment further includes a connecting portion 123, and the first magnetic conductive plate 121 and the second magnetic conductive plate 122 are respectively connected to the opposite ends of the connecting portion 123 in the first direction, so that the magnetic conductive structure 120 is U-shaped. Further, the conductive member 110 is provided with a first card slot 116 and a second card slot 117 penetrating the conductive member 110 along the second direction, and the connecting portion 123 of the magnetic conductive structure 120 is arranged on the second side of the conductive member 110, and the first magnetic conductive plate 121 and the second magnetic conductive plate 122 respectively pass through the first card slot 116 and the second card slot 117 so as to be protruded from the first side of the conductive member 110.

[0043] Optionally, the entire magnetic conductive structure 120 may be integrally formed, such as by bending or casting a plate; or, the magnetic conductive structure 120 may be assembled. The material of the magnetic conductive structure 120 may be pure iron.

[0044] Figure 5 This is a schematic diagram of a static touch cover 130 in one embodiment of the present application; Figure 6 FIG. 1 is a cross-sectional view of the cooperation between the static touch cover 130 and the magnetic conductive structure 120 in one embodiment of the present application. Figure 1 , Figure 5 and Figure 6As shown, in the embodiment of the present application, the static contact cover 130 is disposed on the first side of the conductive member 110, and is used to fix the magnetic conductive structure 120. Specifically, the static contact cover 130 includes a seat body 131, a first matching sleeve 132, and a second matching sleeve 133. The first matching sleeve 132 and the second matching sleeve 133 are both connected to the seat body 131 and are spaced apart from each other. The first matching sleeve 132 forms a first slot 1321, and the second matching sleeve 133 forms a second slot 1331. The openings of the first slot 1321 and the second slot 1331 are both facing the conductive member 110 along the second direction. The openings of the first slot 1321 and the second slot 1331 are respectively opposite to the first card slot 116 and the second card slot 117, so as to be connected to the first card slot 116 and the second card slot 117 respectively. The first slot 1321 and the second slot 1331 are respectively plugged with the first magnetic conductive plate 121 and the second magnetic conductive plate 122, and restrict the first magnetic conductive plate 121 and the second magnetic conductive plate 122 from moving toward the second side of the conductive member 110, and the seat body 131 abuts against the first side of the conductive member 110. In this embodiment, the connection portion 123 of the magnetic conductive structure 120 is located on the second side of the conductive member 110, and abuts against the second side, specifically abuts against the bearing portion 115, so that the magnetic conductive structure 120 cannot further move toward the first side of the conductive member 110; and the first slot 1321 and the second slot 1331 of the static contact cover 130 are respectively plugged with the first magnetic conductive plate 121 and the second magnetic conductive plate 122, and the static contact cover 130 abuts against the first side of the conductive member 110, so that the magnetic conductive structure 120 can be restricted from moving toward the first side of the conductive member 110. In this way, the magnetic conductive structure 120 is positioned in the second direction. In addition, the first slot 1321 and the second slot 1331 of the static touch cover 130 can also limit the movement of the magnetic conductive structure 120 in the third direction, so that the magnetic conductive structure 120 is positioned in the third direction.

[0045] In this embodiment, the first mating sleeve 132 and the second mating sleeve 133 are spaced apart in the first direction, and an avoidance space is formed therebetween, which can avoid the moving contact assembly 300, so that the moving contact of the moving contact assembly 300 can approach or move away from the static contact 1151 located between the first mating sleeve 132 and the second mating sleeve 133 along the second direction.

[0046] In this embodiment, the static contact cover 130 mainly limits the movement of the magnetic conductive structure 120 toward the second side of the conductive member 110 through a snap-fit ​​structure. Optionally, one of the first magnetic conductive plate 121 and the first matching sleeve 132 is provided with a first male buckle 1322, and the other is provided with a first female buckle 1211, and the first male buckle 1322 is snap-fitted with the first female buckle 1211; one of the second magnetic conductive plate 122 and the second matching sleeve 133 is provided with a second male buckle 1332, and the other is provided with a second female buckle 1221, and the second male buckle 1332 is snap-fitted with the second female buckle 1221. In this embodiment, the first male buckle 1322 is provided on the first matching sleeve 132, the first female buckle 1211 is provided on the first magnetic conductive plate 121, the second male buckle 1332 is provided on the second matching sleeve 133, and the second female buckle 1221 is provided on the second magnetic conductive plate 122. The first male buckle 1322 and the second male buckle 1332 have a certain elasticity in the first direction, so that they can spontaneously push into or withdraw from the first female buckle 1211 and the second female buckle 1221 under external force. In this embodiment, the first female buckle 1211 and the second female buckle 1221 are holes opened on the first magnetic conductive plate 121 and the second magnetic conductive plate 122, and the holes can be through holes or blind holes. When the first male buckle 1322 is matched with the first female buckle 1211 and the second male buckle 1332 is matched with the second female buckle 1221, the magnetic conductive structure 120 cannot be pulled out from the first slot 1321 and the second slot 1331 under the action of gravity, and a certain external force needs to be applied to separate it from the static touch cover 130. In other optional embodiments, the static touch cover 130 and the magnetic conductive structure 120 may not be provided with a snap-fit ​​structure, but with an interference fit to prevent the first magnetic conductive plate 121 and the second magnetic conductive plate 122 from being pulled out from the first slot 1321 and the second slot 1331.

[0047] Further, the first limiting portions 1311 are respectively provided at opposite ends of the seat body 131 of the static contact cover 130 in the first direction, and the two first limiting portions 1311 protrude toward the second side of the conductive member 110 along the first direction, and a part of the conductive member 110 is clamped between the two first limiting portions 1311. Specifically, the static contact portion 113 of the conductive member 110 is clamped between the two first limiting portions 1311, thereby improving the matching stability between the conductive member 110 and the static contact cover 130, and further improving the stability of the relative position of the magnetic conductive structure 120 with respect to the conductive member 110.

[0048] Furthermore, a second limiting portion 1312 is disposed at one end of the seat body 131 close to the wiring portion 111 , and the second limiting portion 1312 abuts against the transition portion 112 , so that the static contact cover 130 and the magnetic conductive structure 120 cannot get closer to the transition portion 112 , thereby being limited in the third direction.

[0049] In this embodiment, the static contact cover 130 can be an integrally formed injection molded part, which has insulation properties. The static contact cover 130 can wrap the first magnetic conductive plate 121 and the second magnetic conductive plate 122 of the magnetic conductive structure 120 to prevent the magnetic conductive structure 120 from contacting and electrically connecting with the moving contact assembly 300, and also to prevent the arc from being attracted and unable to enter the arc extinguishing chamber 220 (see Figure 7 )sports.

[0050] Figure 7 FIG. 1 is a cross-sectional view of a circuit breaker 010 in one embodiment of the present application. Figure 7 As shown, the circuit breaker 010 provided in the embodiment of the present application includes a moving contact assembly 300 and the stationary contact assembly 100 of the above embodiment. The moving contact assembly 300 can move relative to the stationary contact assembly 100 to connect with or separate from the stationary contact 1151 .

[0051] In this embodiment, the circuit breaker 010 includes a base 200 and a cover 210, and the base 200 and the cover 210 form an accommodating cavity, and the static contact assembly 100 and the moving contact assembly 300 are arranged in the accommodating cavity. Specifically, the conductive member 110 of the static contact assembly 100 is fixed to the base 200 through the mounting hole 1112, and the static contact cover 130, the first magnetic conductive plate 121 and the second magnetic conductive plate 122 are arranged on the side of the conductive member 110 away from the base 200. Further, the circuit breaker 010 also includes a guide plate 230 and an arc extinguishing chamber 220. The arc extinguishing chamber 220 is located on the side of the static contact assembly 100 away from the base 200, and is spaced from the static contact assembly 100. A guide hole (not shown in the figure) is opened on the guide plate 230, and the arc extinguishing chamber 220 is located between the moving contact assembly 300 and the guide plate 230. In this embodiment, an arc extinguishing space is formed on the inner side (right side in the figure) of the guide plate 230, and the arc extinguishing chamber 220, the static contact 1151 and the moving contact of the moving contact assembly 300 are all arranged in the arc extinguishing space, and the guide hole can exhaust gas outward when the air pressure in the arc extinguishing space increases. The arc extinguishing chamber 220 includes a plurality of arc extinguishing grids arranged at intervals from each other, which are used to cut off and eliminate the arc when the arc passes through the arc extinguishing chamber 220, so as to achieve an arc extinguishing effect.

[0052] In this embodiment, the base 200 is not flat, but has a height difference in some parts. Figure 7 As shown in FIG. 1 , the connection portion 111 and the static contact portion 113 of the conductive member 110 are both supported by the base 200 and are at different heights. Specifically, a support platform 240 is provided on the base 200, and the support platform 240 is supported on the side of the bearing portion 115 away from the static contact 1151 (i.e. Figure 7 The support platform 240 is also supported on the connection portion 123 of the magnetic conductive structure 120.

[0053] The accommodating chamber of the circuit breaker 010 is also provided with an electrical connector 310, an iron core 400, an armature 600, a connecting plate 500, a traction member 700, and a trigger mechanism 800. In the normal power-on state, Figure 7 As shown in , the current is transmitted along the direction of the static contact assembly 100, the moving contact assembly 300, the electrical connector 310, and the connecting plate 500. In the normal power-on state, the current intensity does not reach the threshold value that is judged as abnormal, so the magnetic field generated by the iron core 400 cannot trigger the movement of the armature 600, and the magnetic field generated by the magnetic structure 120 in the static contact assembly 100 is not enough to separate the moving contact assembly 300 from the static contact assembly 100. However, when the current increases abnormally (such as a short circuit), the first magnetic plate 121 and the second magnetic plate 122 of the magnetic structure 120 will generate a very strong magnetic field, and the moving contact assembly 300 with current will be subjected to a large Ampere force (i.e., repulsive force), so that it rotates clockwise and separates from the static contact assembly 100, thereby achieving rapid power failure. At the same time as the power is cut off, an arc will be generated between the static contact 1151 and the moving contact of the moving contact assembly 300, and the strong magnetic field will cause the arc to move toward the arc extinguishing chamber 220. Furthermore, when the stationary contact cover 130 is made of plastic, the electric arc burns the stationary contact cover 130, and gas is rapidly generated, resulting in a pressure difference between the inside and outside of the arc extinguishing space. The gas can carry the arc to move from between the stationary contact 1151 and the moving contact to the guide hole of the guide plate 230. During this period, the airflow and the arc will pass through the arc extinguishing chamber, and the arc extinguishing grid can cut the arc into multiple sections and cool the arc to achieve arc extinguishing, and the gas is discharged from the circuit breaker 010. It can be seen that the circuit breaker 010 of this embodiment has a better arc extinguishing ability.

[0054] In this embodiment, the first matching sleeve 132 and the second matching sleeve 133 are made of insulating materials. By providing the first matching sleeve 132 and the second matching sleeve 133, when the moving contact and the static contact 1151 of the moving contact assembly 300 are separated and an arc is generated between the two, the arc is not easily attracted to the first magnetic conductive plate 121 and the second magnetic conductive plate 122, but tends to move toward the arc extinguishing chamber 220 along a direction parallel to the first magnetic conductive plate 121 and the second magnetic conductive plate 122. Moreover, the first matching sleeve 132 and the second matching sleeve 133 make the space between the first magnetic conductive plate 121 and the second magnetic conductive plate 122 narrower, which has a better guiding effect on the arc, so that the arc can accurately move toward the arc extinguishing chamber 220, thereby improving the arc extinguishing effect.

[0055] When the current increases instantly, the iron core 400 will also generate a large magnetic field to make the armature 600 rotate counterclockwise, and the armature 600 hits the traction member 700, and the traction member 700 rotates to unlock the trigger mechanism 800, and the trigger mechanism 800 pulls the moving contact assembly 300 under the action of the spring and other components, so that it is further away from the static contact assembly 100. The structures and transmission principles of the iron core 400, the armature 600, the traction member 700, the trigger mechanism 800, etc. can refer to the existing technology and will not be repeated here.

[0056] It can be understood that the moment when the magnetic conductive structure 120 of the static contact assembly 100 and the iron core 400 generate a magnetic field can be regarded as being carried out simultaneously, and thereafter the movable contact assembly 300 first moves under the repulsive force of the static contact assembly 100 and separates from the static contact assembly 100, and the armature 600, the traction member 700, the trigger mechanism 800 and other components sequentially transmit will consume a certain time, so the event that the movable contact assembly 300 is finally pulled by the trigger mechanism 800 occurs after the movable contact assembly 300 is separated from the static contact assembly 100. It can be seen that the static contact assembly 100 provided in the embodiment of the present application can quickly and timely repel the movable contact assembly 300 when encountering a large current to achieve power off, thereby avoiding the large current from lasting too long and improving safety.

[0057] In summary, the static contact assembly 100 of the present application includes a conductive member 110, a magnetic conductive structure 120 connected to the conductive member 110, and a static contact cover 130, the magnetic conductive structure 120 includes a first magnetic conductive plate 121 and a second magnetic conductive plate 122 spaced apart in a first direction, the conductive member 110 includes a static contact 1151, the static contact 1151 is used to connect or separate with the moving contact assembly 300 of the circuit breaker 010, the static contact 1151 is located between the first magnetic conductive plate 121 and the second magnetic conductive plate 122, the first magnetic conductive plate 121 and the second magnetic conductive plate 122 are used to generate a magnetic field when the conductive member 110 is energized, so that the energized moving contact assembly 300 is subjected to a repulsive force tending to separate it from the static contact 1151; the static contact cover 130 includes a first mating sleeve 132 and a second mating sleeve 133, the first mating sleeve 132 and the second mating sleeve 133 are respectively sleeved on the outer sides of the first magnetic conductive plate 121 and the second magnetic conductive plate 122. When using the static contact assembly 100 provided by the present application, since the first magnetic conductive plate 121 and the second magnetic conductive plate 122 are provided, once a large current appears, a magnetic field can be immediately generated between the first magnetic conductive plate 121 and the second magnetic conductive plate 122, and the moving contact assembly 300 with a large current will be subjected to a large repulsive force (Ampere force) under the action of the magnetic field, forcing it to separate from the static contact 1151. It can be seen that the static contact assembly 100 provided by the embodiment of the present application can achieve circuit cutting in a very short time when encountering a large current. Compared with the prior art that relies on a series of momentum transmission such as the armature 600 and the trigger mechanism 800 to finally pull the moving contact assembly 300 to achieve power off, it has better timeliness, so it can better prevent electrical equipment from being damaged by large currents. Furthermore, by providing an insulating static contact cover 130 to wrap the first magnetic conductive plate 121 and the second magnetic conductive plate 122, the arc generated between the separated static contact 1151 and the moving contact is not easily attracted to the first magnetic conductive plate 121 and the second magnetic conductive plate 122, and the arc can be restricted by the first matching sleeve 132 and the second matching sleeve 133, and has a more certain movement direction, that is, it moves in a direction parallel to the first magnetic conductive plate 121 and the second magnetic conductive plate 122, which is conducive to its movement to the arc extinguishing chamber 220 and then being eliminated, thereby improving the arc extinguishing effect and safety. The circuit breaker 010 provided in the embodiment of the present application includes the above-mentioned static contact assembly 100, and therefore also has the above-mentioned corresponding beneficial effects.

[0058] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. 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 static contact assembly, applied to a circuit breaker, characterized in that: The invention comprises a conductive member (110), a magnetic conductive structure (120) connected to the conductive member (110), and an insulating static contact cover (130); the magnetic conductive structure (120) comprises a first magnetic conductive plate (121) and a second magnetic conductive plate (122) spaced apart in a first direction; the conductive member (110) comprises a static contact (1151); the static contact (1151) is used to connect to or separate from a moving contact assembly (300) of the circuit breaker (010); the static contact (1151) is located between the first magnetic conductive plate (121) and the second magnetic conductive plate ( 122), the first magnetic conductive plate (121) and the second magnetic conductive plate (122) are used to generate a magnetic field when the conductive member (110) is energized, so that the energized moving contact assembly (300) is subjected to a repulsive force tending to separate it from the static contact (1151); the static contact cover (130) comprises a first matching sleeve (132) and a second matching sleeve (133), the first matching sleeve (132) and the second matching sleeve (133) are respectively sleeved on the outer sides of the first magnetic conductive plate (121) and the second magnetic conductive plate (122).

2. The stationary contact assembly according to claim 1, characterized in that: The magnetic conductive structure (120) further comprises a connecting portion (123), and the first magnetic conductive plate (121) and the second magnetic conductive plate (122) are respectively connected to opposite ends of the connecting portion (123), so that the magnetic conductive structure (120) is U-shaped.

3. The stationary contact assembly according to claim 2, characterized in that: The conductive member (110) has a first side and a second side opposite to each other in a second direction, the second direction being perpendicular to the first direction, the static contact (1151) being arranged on the first side of the conductive member (110), the conductive member (110) being provided with a first slot (116) and a second slot (117) penetrating the conductive member (110) along the second direction, the connecting portion (123) being arranged on the second side of the conductive member (110), the first magnetic conductive plate (121) and the second magnetic conductive plate (122) respectively passing through the first slot (116) and the second slot (117) so as to be protruding from the first side of the conductive member (110).

4. The stationary contact assembly according to claim 3, characterized in that: The static contact cover (130) also includes a seat body (131); the first matching sleeve (132) and the second matching sleeve (133) are both connected to the seat body (131) and are spaced apart from each other; the first matching sleeve (132) forms a first slot (1321); the second matching sleeve (133) forms a second slot (1331); the openings of the first slot (1321) and the second slot (1331) are both oriented toward the conductive member (110) along the second direction; the first slot (1321) and the second slot (1331) are respectively plugged and matched with the first magnetic conductive plate (121) and the second magnetic conductive plate (122), and restrict the first magnetic conductive plate (121) and the second magnetic conductive plate (122) from moving toward the second side of the conductive member (110); and the seat body (131) abuts against the first side of the conductive member (110).

5. The stationary contact assembly according to claim 4, characterized in that: The seat body (131) is provided with first limiting portions (1311) at two opposite ends in the first direction, respectively; the two first limiting portions (1311) protrude toward the second side of the conductive member (110) along the first direction; and a part of the conductive member (110) is clamped between the two first limiting portions (1311).

6. The stationary contact assembly according to claim 5, characterized in that: The conductive member (110) comprises a wiring portion (111), a transition portion (112) and a static contact portion (113) which are sequentially connected in a third direction, and the third direction is perpendicular to the first direction and the second direction; the static contact (1151) and the magnetic conductive structure (120) are both arranged on the static contact portion (113), the positions of the static contact portion (113) and the wiring portion (111) in the second direction are staggered, the two ends of the transition portion (112) in the second direction are respectively connected to the wiring portion (111) and the static contact portion (113), and the seat body (131) is provided with a second limiting portion (1312) at one end close to the wiring portion (111), and the second limiting portion (1312) abuts against the transition portion (112).

7. The stationary contact assembly according to claim 6, characterized in that: The stationary contact portion (113) comprises a U-shaped frame (114) and a bearing portion (115); two ends of the U-shaped frame (114) are connected to the transition portion (112); the bearing portion (115) is connected to the inner side of the bottom of the U-shaped frame (114) and extends toward the wiring portion (111); the stationary contact (1151) is arranged on the bearing portion (115); a first card slot (116) and a second card slot (117) are formed between two opposite side edges of the U-shaped frame (114) and the bearing portion (115); the first magnetic conductive plate (121) and the second magnetic conductive plate (122) are respectively plugged into and matched with the first card slot (116) and the second card slot (117).

8. The stationary contact assembly according to claim 6, characterized in that: The wiring portion (111) is provided with a wiring hole (1111) and / or a mounting hole (1112).

9. The stationary contact assembly according to claim 1, characterized in that: One of the first magnetic conductive plate (121) and the first matching sleeve (132) is provided with a first male buckle (1322), and the other is provided with a first female buckle (1211), and the first male buckle (1322) is snap-fitted with the first female buckle (1211); One of the second magnetic conductive plate (122) and the second matching sleeve (133) is provided with a second male buckle (1332), and the other is provided with a second female buckle (1221), and the second male buckle (1332) is snap-fitted with the second female buckle (1221).

10. The stationary contact assembly according to claim 1, characterized in that: The material of the static touch cover (130) is plastic.

11. A circuit breaker, characterized in that: It comprises a base (200), a moving contact assembly (300) and a stationary contact assembly (100) according to any one of claims 1 to 10, wherein the conductive member (110) is connected to the base (200), the stationary contact cover (130), the first magnetic conductive plate (121) and the second magnetic conductive plate (122) are arranged on a side of the conductive member (110) facing away from the base (200), and the moving contact assembly (300) can move relative to the stationary contact assembly (100) to connect with or separate from the stationary contact (1151).

12. The circuit breaker according to claim 11, characterized in that The circuit breaker further comprises a guide plate (230) and an arc extinguishing chamber (220); the arc extinguishing chamber (220) is located on a side of the stationary contact assembly (100) away from the base (200) and is spaced apart from the stationary contact assembly (100); a guide hole is provided on the guide plate (230); and the arc extinguishing chamber (220) is located between the moving contact assembly (300) and the guide plate (230).

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