CN115547777A - Contact structure and circuit breaker - Google Patents

Abstract

The invention relates to the technical field of low-voltage electric appliances, and particularly discloses a contact structure and a circuit breaker. The contact structure comprises two groups of conducting strip groups which are opposite and spaced, wherein one ends of the two groups of conducting strip groups are used for clamping a body end bus, and the other ends of the two groups of conducting strip groups are used for clamping a drawer seat bus; the plate spring is arranged corresponding to the conducting sheet group and is contacted with the outer side of the conducting sheet group; the magnetic conduction piece is arranged between the conductive sheet group and the plate spring; the fixing piece is used for connecting the two groups of conducting sheet sets and fixing the plate spring and the magnetic conduction piece on the conducting sheet sets. According to the contact structure provided by the invention, the magnetic conduction piece is arranged between the conductive sheet group and the plate spring, so that the magnetic field around the contact when current flows through the contact is increased, the clamping force between the two conductive sheet groups is increased through the suction compensation generated by the magnetic field, the pressure of the plate spring is reduced, and the acting force for shaking in and out the drawer seat of the drawer type circuit breaker body is reduced under the condition of bearing short-time endurable current.

Description

Contact structure and circuit breaker

Technical Field

The invention relates to the technical field of low-voltage electric appliances, in particular to a contact structure and a circuit breaker.

Background

The withdrawable circuit breaker is composed of a drawer seat and a drawer circuit breaker body, the connection of the drawer circuit breaker body and the drawer seat requires a plug-in electrical connection structure, which is called a bridge contact structure, as shown in fig. 1, the bridge contact structure includes a bridge contact 10', a body end bus 100 and a drawer seat bus 200.

As shown in fig. 2, the bridge contact 10' of the prior art includes a conductive sheet 101', a plate spring 102', a fixing frame 103', and a fixing pin 104'. Under the action of the plate spring 102', the conductive sheet 101' is clamped with the body end bus bar 100 and the drawer seat bus bar 200 by means of the matching of the fixing frame 103 'and the fixing pin 104'. In use, when current flows through the bridge contact 10', attractive lorentz forces are generated on two sides of the bridge contact 10', but lateral forces of different magnitudes are applied to the conductive strips 101' of the bridge contacts 10' at different positions, and the lateral forces cause the bridge contacts 10' to repel apart. Therefore, the clamping force of the bridge contact 10' needs to be ensured within a certain range, so that the breaker can bear the destructive effect generated by large short-circuit current within a certain time in the working process. Meanwhile, the acting force for shaking in and out the drawer type circuit breaker body needs to be considered in the process of shaking in and out the drawer seat. In the prior art, in order to ensure that the clamping force between the bridge contact 10 'and the body end bus 100 and the drawer base bus 200 reaches a certain safety range in the use process, the spring force of the plate spring of the bridge contact 10' is increased preferentially, so that the acting force is larger when the body is shaken in and out.

Therefore, it is desirable to provide a contact structure and a circuit breaker to solve the above-mentioned technical problems.

Disclosure of Invention

The invention aims to provide a contact structure and a circuit breaker, which improve the clamping force of a bridge-shaped contact and reduce the acting force of shaking in and out a drawer seat on a drawer type circuit breaker body.

In order to achieve the purpose, the invention adopts the following technical scheme:

there is provided a contact structure comprising:

the two groups of conducting sheet groups are oppositely arranged at intervals, one ends of the two groups of conducting sheet groups are used for clamping the body end bus, and the other ends of the two groups of conducting sheet groups are used for clamping the drawer seat bus;

the plate spring is arranged corresponding to the conductive sheet set and is in contact with the outer side of the conductive sheet set;

the magnetic conduction piece is arranged between the conductive sheet group and the plate spring;

and the fixing piece is used for connecting the two groups of conducting strip groups and fixing the plate spring and the magnetic conduction piece on the conducting strip group.

As an optional technical scheme of foretell contact structure, conducting strip group includes the conducting strip that a plurality of superpositions set up, one side of conducting strip is equipped with and holds the holding tank of magnetic conduction spare, the both sides wall that the holding tank is relative is equipped with the step face, the both ends overlap joint of leaf spring in on the step face, the opposite side of conducting strip be equipped with the first connecting portion that the mounting is connected.

As an optional technical scheme of the above contact structure, the magnetic conduction member is a U-shaped member, the bottom of the magnetic conduction member is embedded into the accommodating groove, two side walls of the magnetic conduction member are lapped on two ends of the conductive sheet set, and two ends of the magnetic conduction member are respectively provided with a second connecting portion connected with the fixing member.

As an optional technical solution of the above contact structure, the first connection portion includes a first bump connected to a sidewall of the conductive sheet, and the first bump is provided with a first mounting groove;

the second connecting part comprises a second lug connected with the end part of the magnetic conduction piece, and the second lug is provided with a second mounting groove corresponding to the first mounting groove;

the fixing piece comprises a bolt, and the bolt is inserted in the second mounting groove and the first mounting groove.

As an optional technical solution of the above contact structure, the plug pin includes a plug pin body and a limiting member disposed on the plug pin body, and the plug pin body is inserted into the second mounting groove and the first mounting groove, and the limiting member prevents the plug pin body from separating from the second mounting groove and the first mounting groove.

As an optional technical solution of the above contact structure, the second protrusion protrudes from the first protrusion, the limiting member includes two elastic pieces, one end of each of the two elastic pieces close to each other is elastically connected to the plug body, the two elastic pieces are arranged in a staggered manner, one side wall of the second mounting groove at any end of the magnetic conductive member is shorter than the other side wall, so that one of the elastic pieces passes through and abuts against the side wall of the second protrusion at the other end of the magnetic conductive member, and the other elastic piece can elastically deform to pass through the second mounting groove at the other magnetic conductive member insertion side and abut against the side wall of the second protrusion at the other magnetic conductive member insertion side.

As an optional technical solution of the above contact structure, the second connecting portion includes a movable groove extending from end portions of two side walls of the magnetic conductive member to a bottom of the magnetic conductive member, the fixing member includes an annular fixing hoop, the fixing hoop is sleeved on two outer sides of the plate spring, and the fixing hoop is clamped in the movable groove.

As an optional technical scheme of foretell contact structure, magnetic conduction spare orientation one side of leaf spring is equipped with the boss, the both ends of leaf spring are equipped with a plurality of hasp teeth respectively, hasp tooth overlap joint in corresponding on the step face of conducting strip, just the leaf spring with the boss contact.

As an optional technical scheme of the above contact structure, the contact structure is provided with one side of the first connecting portion, a first arc surface is concavely arranged at the edge of one end of the conducting strip, the first arc surface is used for being connected with the bus at the end of the body in a matched manner, a second arc surface is convexly arranged at the edge of the other end of the conducting strip, and the second arc surface is connected with the bus of the drawer seat in a matched manner.

A circuit breaker is provided, which comprises a body end bus, a drawer base bus and the contact structure of any one of the above.

The invention has the beneficial effects that:

according to the contact structure provided by the invention, the magnetic conduction piece is arranged between the conductive sheet group and the plate spring, so that the magnetic field around the contact when current flows through the contact is increased, the clamping force between the two conductive sheet groups is increased through the suction compensation generated by the magnetic field, the pressure of the plate spring is reduced, and the acting force for shaking in and out the drawer seat of the drawer type circuit breaker body is reduced under the condition of bearing short-time endurable current.

Drawings

FIG. 1 is a schematic diagram of a prior art bridge contact connected to a body end bus and a drawer base bus;

FIG. 2 is a schematic diagram of a prior art bridge contact;

fig. 3 is a schematic structural view of a contact connected with a body end bus bar and a drawer base bus bar according to an embodiment of the present invention;

FIG. 4 is a schematic view of an assembled structure of a contact according to an embodiment of the present invention;

FIG. 5 is an exploded view of a contact provided by an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a conductive sheet provided in an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a first viewing angle of the magnetic conducting member according to the embodiment of the present invention;

fig. 8 is a structural diagram of a second viewing angle of the magnetic conducting member according to the embodiment of the present invention;

FIG. 9 is a schematic structural diagram of a latch according to an embodiment of the present invention;

fig. 10 is a schematic structural diagram of relative positions of a limiting member and a second mounting groove according to an embodiment of the present invention;

FIG. 11 is a schematic view of a contact to body end bus bar connection configuration provided by an embodiment of the present invention;

fig. 12 is a schematic structural view of a leaf spring according to an embodiment of the present invention.

In the figure:

10', a bridge type contact; 101', a conductive sheet; 102', a leaf spring; 103', a fixing frame; 104', a fixing pin;

100. a body end bus; 200. a drawer base bus;

10. a contact;

1. a conducting strip group; 2. a plate spring; 3. a magnetic conductive member; 4. a fixing member;

11. a conductive sheet; 111. accommodating grooves; 112. a step surface; 12. a first connection portion; 121. a first bump; 122. a first mounting groove; 13. a first arc surface; 14. a second arc surface;

21. a buckle tooth;

31. a second connecting portion; 311. a second bump; 312. a second mounting groove; 313. a movable groove; 32. a boss;

41. a bolt; 411. a plug pin body; 412. a limiting member; 42. and fixing the hoop.

Detailed Description

In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

In the description of the present invention, unless otherwise explicitly specified or limited, the terms "connected," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integral to one another; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless expressly stated or limited otherwise, the recitation of a first feature "on" or "under" a second feature may include the recitation of the first and second features being in direct contact, and may also include the recitation that the first and second features are not in direct contact, but are in contact via another feature between them. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

As shown in fig. 3 to 5, the present embodiment provides a contact structure including a conductive sheet group 1, a plate spring 2, a magnetic conductive member 3, and a fixing member 4. The two conductive sheet groups 1 are arranged oppositely and at intervals, one end of each conductive sheet group 1 is used for clamping the body end bus 100, and the other end of each conductive sheet group 1 is used for clamping the drawer seat bus 200. Each group of conducting strip sets 1 is respectively and correspondingly provided with a plate spring 2, and the plate springs 2 are in contact with the outer sides of the conducting strip sets 1. A magnetic conduction piece 3 is arranged between the conducting piece group 1 and the plate spring 2, and the fixing piece 4 is connected with the two conducting piece groups 1 and enables the plate spring 2 and the magnetic conduction piece 3 to be fixed on the conducting piece groups 1.

The contact structure that this embodiment provided has set up magnetic conduction piece 3 between conducting strip group 1 and leaf spring 2, has increased the magnetic field around when electric current flows through contact 10, and the suction compensation that produces through the magnetic field has increased the clamp force between two sets of conducting strip groups 1, has reduced the pressure of leaf spring 2, under the condition that can bear short-time withstand current, has reduced the effort of shaking out the drawer seat to the withdrawable circuit-breaker body.

As shown in fig. 5 and fig. 6, the conducting strip group 1 includes a plurality of conducting strips 11 arranged in a stacked manner, one side of each conducting strip 11 is provided with an accommodating groove 111, the accommodating groove 111 is used for accommodating the magnetic conductive element 3, and one sides of the conducting strips 111 of the two groups of conducting strip groups 1, which deviate from each other, are respectively provided with the accommodating groove 111. Two opposite side walls of the receiving groove 111 are provided with step surfaces 112, and both ends of the plate spring 2 are lapped on the step surfaces 112. Under the action of the plate spring 2 and the magnetic conduction piece 3, the two groups of conducting strip groups 1 clamp the body end bus 100 and the drawer seat bus 200 by means of the fixing pieces 4. The other side of the conducting strips 11 is provided with first connecting portions 12 connected to the fixing member 4, that is, the first connecting portions 12 are respectively provided on the sides of the conducting strips 11 of the two groups of conducting strip groups 1 close to each other, so that the fixing member 4 connects the two groups of conducting strip groups 1.

In some embodiments, referring to fig. 5, 7 and 8, the magnetic conducting member 3 is a U-shaped member, the magnetic conducting member 3 is half-wrapped around the plurality of conductive sheets 11, the bottom of the magnetic conducting member 3 is embedded into the receiving groove 111 of the conductive sheet 11 to fix the magnetic conducting member 3, and the magnetic conducting member 3 enables the positions of the plurality of conductive sheets 11 to be relatively fixed. Two side walls of the magnetic conduction member 3 are lapped on two ends of the conducting strip group 1, namely, two side walls of the magnetic conduction member 3 are contacted with the conducting strip 11 at the upper end of the conducting strip group 1 and the conducting strip 11 at the lower end of the conducting strip group 1. The two ends of the magnetic conduction member 3 are respectively provided with a second connection portion 31 connected with the fixing member 4, so as to fix the magnetic conduction member 3 on the conductive sheet set 1.

Referring to fig. 6, the first connection portion 12 includes a first bump 121 connected to the sidewall of the conductive plate 11, and the first bump 121 is provided with a first mounting groove 122. With continued reference to fig. 7 and 8, the second connecting portion 31 includes a second protrusion 311 connected to the end of the magnetic conductive member 3, and the second protrusion 311 is provided with a second mounting groove 312 corresponding to the first mounting groove 122. When the magnetic conduction member 3 is mounted on the conducting strip set 1, the second mounting groove 312 is disposed outside the first mounting groove 122. Referring to fig. 5, the fixing element 4 includes a plug 41, and the plug 41 is inserted into the second mounting groove 312 and the first mounting groove 122 to connect the magnetic conductive member 3 and the conducting strip group 1.

As shown in fig. 5 to 9, the plug 41 includes a plug body 411, the plug body 411 is a U-shaped member, and the thickness of the plug body 411 is matched with the widths of the first mounting groove 122 and the second mounting groove 312, so as to prevent the plug body 411 from swinging in the first mounting groove 122 and the second mounting groove 312, which may affect the connection stability of the two sets of conducting strip sets 1 and the magnetic conductive member 3.

The pin body 411 is provided with a limiting member 412, the pin body 411 is inserted into the second mounting groove 312 and the first mounting groove 122, and the limiting member 412 prevents the pin body 411 from separating from the second mounting groove 312 and the first mounting groove 122, so as to improve the connection stability of the pin body 411 with the magnetic conductive member 3 and the conductive plate set 1.

In some embodiments, the position-limiting element 412 includes two elastic pieces, and one ends of the two elastic pieces close to each other are elastically connected to the plug body 411 respectively. Specifically, set up the hole at the tip lateral wall of bolt body 411, the one end of shell fragment and the local pore wall elastic connection in hole, when the shell fragment was compressed, the shell fragment can be held in the hole to avoid. Optionally, the elastic sheet is integrally connected with the hole wall of the hole, and the elastic sheet can be formed by cutting on the plug pin body 411, so that the structure is simple and the implementation is easy.

With reference to fig. 9 and 10, one of the second mounting grooves 312 is defined as the second mounting groove 312 at the insertion side, and the other second mounting groove 312 is defined as the second mounting groove 312 at the limiting side, after the plug pin body 411 is inserted from the second mounting groove 312 at the insertion side and then extends out from the second mounting groove 312 at the limiting side, one of the elastic pieces abuts against the side wall of the second protruding block 311 at the insertion side, and the other elastic piece abuts against the side wall of the second protruding block 311 at the limiting side. Specifically, the one end that two shell fragments are close to relatively respectively with bolt body 411 elastic connection, and two shell fragments are crisscross to be set up, and the free end of two shell fragments deviates from the setting. One side wall of the second mounting groove 312 at any end of the magnetic conduction member 3 is shorter than the other side wall so as to allow one of the elastic pieces to pass through and abut against the side wall of the second bump 311 at the other end of the magnetic conduction member 3, and because the free end of the elastic piece abuts against the side wall of the second bump 311, the elastic piece cannot be abutted and pressed to generate elastic deformation in the inserting process, so that when the plug pin body 411 passes through the plug pin body 411 at the inserting side, the elastic piece is in a popping state and cannot penetrate out of the second mounting groove 312 at the limiting side, and the effect of limiting the plug pin body 411 is achieved. And in the process that the other elastic sheet passes through the second mounting groove 312 on the insertion side of the other magnetic conductive member 3, the elastic sheet is pressed by the groove wall of the second mounting groove 312 to deform, and after the elastic sheet completely passes through the second mounting groove 312 on the insertion side, the elastic sheet resets and the free end of the elastic sheet abuts against the side wall of the second projection 311 on the insertion side of the other magnetic conductive member 3. The two elastic pieces play a role in limiting the position of the plug body 411, the plug 41 is locked in the first mounting groove 122 and the second mounting groove 312 and cannot be taken out, and the structure is simple, so that the plug 41 is convenient to mount, and the reliable assembly of the contact 10 is realized.

In other embodiments, the plug 41 may have other structures, for example, two protrusions with elastic and plastic deformation are disposed on the plug body 411 as the limiting member 412, the two protrusions are disposed in the same manner as the above spring plate, and the protrusions have guiding surfaces so that the protrusions can pass through the second mounting groove 312 on the insertion side.

In some embodiments, referring to fig. 5 and 7, the second connecting portion 31 includes a movable groove 313, and ends of two sidewalls of the magnetic conducting member 3 extend to a bottom of the magnetic conducting member 3 to form the movable groove 313. The fixing member 4 includes an annular fixing hoop 42, the fixing hoop 42 is sleeved outside the two plate springs 2, and the fixing hoop 42 is clamped in the movable groove 313. The fixing hoop 42 can fix the plate spring 2, the magnetic conduction member 3 and the conducting strip group 1 together.

Further, the movable groove 313 is in a bell mouth shape from the end of the side wall of the magnetizer 3 to the bottom of the magnetizer 3, so that the fixing hoop 42 is clamped in the movable groove 313, and the minimum groove width of the movable groove 313 is matched with the width of the fixing hoop 42 to limit the position of the fixing hoop 42 and avoid the fixing hoop 42 from shaking.

Referring to fig. 4, 6 and 7, in the length direction of the conducting strip 11, the first mounting groove 122 is disposed at the middle position of the conducting strip 11, in the length direction of the magnetic conducting member 3, the second mounting groove 312 is disposed at the middle position of the magnetic conducting member 3, and the movable groove 313 is disposed at one side of the second mounting groove 312. After the installation of the latch 41 and the fixing hoop 42 is completed, the latch 41 is a rotation center of the contact 10, the fixing hoop 42 is offset from the rotation center, under the action of the fixing hoop 42, the plate spring 2 is compressed and deformed to generate an elastic force, the elastic force enables the conductive sheet 11 to be held tightly inwards, the movable groove 313 on the magnetic conductive member 3 limits the movement range of the fixing hoop 42, that is, the maximum deformation of the plate spring 2, that is, the opening range of the contact 10, and improves the clamping force of the contact 10.

In some embodiments, as shown in fig. 6 and 11, a first arc surface 13 is concavely provided at an edge of one end of the conductive plate 11 on the side where the first connection portion 12 is provided, the first arc surface 13 is used for being connected with the body-end bus bar 100 in a matching manner, a second arc surface 14 is convexly provided at an edge of the other end of the conductive plate 11, and the second arc surface 14 is connected with the drawer seat bus bar 200 in a matching manner. The connection of the conductive plate 11 to the body terminal bus bar 100 is changed from a straight contact surface in the prior art to an arc contact surface.

Because the fixed hoop 42 of the contact 10 deviates from the position of the rotation center, in an initial state, one end of the conductive sheet 11 provided with the first arc surface 13 is pressed close to each other, the other end of the conductive sheet 11 is pressed, one end of the conductive sheet 11 provided with the first arc surface 13 is opened, the contact 10 is installed on the body end bus 100, the first arc surface 13 is matched with the structure with the arc surface on the body end bus 100, the structure with the arc surface of the body end bus 100 is the same as the circle center and the radius of the first arc surface 13 on the conductive sheet 11, two groups of conductive sheet groups 1 of the contact 10 can symmetrically rotate for a certain angle and can fully contact with the body end bus 100, and the clamping force of the conductive sheet 11 and the body end bus 100 is improved. When the body end bus 100 drives the contact 10 to shake in or out the drawer base bus, the second arc surface 14 on the conducting strip 11 is matched and plugged with the drawer base bus 200, the contact 10 can symmetrically rotate by a certain angle, the action is more prominent, the second arc surface 14 can rotate under the action of the body end bus 100, the position of the contact 10 can be corrected, and the contact is conveniently plugged with the drawer base bus 200.

In some embodiments, as shown in fig. 4, 6, 7 and 12, the two ends of the plate spring 2 are respectively provided with a plurality of snap teeth 21, the snap teeth 21 are arranged in one-to-one correspondence with the conductive sheets 11, and the snap teeth 21 are lapped on the step surface 112 of the corresponding conductive sheet 11, so as to limit the installation position of the plate spring 2. The conducting strip 11 of contact 10 all can receive the electric power of side direction, the lateral force of conducting strip 11 both sides is bigger, the edge of conducting strip 11 can incline slightly or warp under the effect of lateral force, thereby make conducting strip 11 and drawer seat generating line 200 contact failure, increase contact resistance and contact temperature, consequently, set up a plurality of conducting strips 11, every conducting strip 11 is connected with the hasp tooth 21 contact of the leaf spring 2 that corresponds respectively, the adverse effect of the lateral force that has reduced conducting strip 11 production to whole contact 10 and drawer seat generating line 200 skew has been reduced.

The magnetic conduction member 3 is provided with a boss 32 on one side facing the plate spring 2, and after the hasp teeth 21 of the plate spring 2 are lapped on the step surface 112 of the conducting strip 11, the plate spring 2 is contacted with the boss 32. The boss 32 cooperates with the latch 21 to restrict the position of the plate spring 2, thereby preventing the plate spring 2 from shaking. Alternatively, two bosses 32 are provided, the bosses 32 are disposed flush with the step surface 112, and two bosses 32 are provided at both ends of the plate spring 2, so that the plate spring 2 is uniformly stressed.

The conducting strip 11 in the above-mentioned contact structure bears the effect of current circulation, and leaf spring 2 provides original clamp force for contact 10, and magnetic conduction piece 3 increases the magnetic field that produces when current flows through contact 10, is used as suction compensation, improves the clamp force of contact 10 structure, and fixed hoop 42 and bolt 41 fix conducting strip group 1, leaf spring 2 and magnetic conduction piece 3.

The present embodiment further provides a circuit breaker, as shown in fig. 3, the circuit breaker includes a body end bus 100, a drawer base bus 200, and the contact structure described above.

The connection structures of the local end bus bar 100 and the drawer base bus bar 200 with the contact structures refer to the above contents, and are not described in detail herein.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. A contact structure, comprising:

the conductive sheet groups (1) are oppositely arranged at intervals, one ends of the two conductive sheet groups (1) are used for clamping a body end bus (100), and the other ends of the two conductive sheet groups (1) are used for clamping a drawer base bus (200);

the plate spring (2) is arranged corresponding to the conductive sheet set (1), and the plate spring (2) is in contact with the outer side of the conductive sheet set (1);

the magnetic conduction piece (3) is arranged between the conducting strip group (1) and the plate spring (2);

and the fixing piece (4) is used for connecting the two groups of conducting strip groups (1) and fixing the plate spring (2) and the magnetic conduction piece (3) on the conducting strip groups (1).

2. The contact structure according to claim 1, wherein the conductive sheet set (1) comprises a plurality of conductive sheets (11) stacked together, one side of each conductive sheet (11) is provided with a holding groove (111) for holding the magnetic conductive member (3), two opposite side walls of the holding groove (111) are provided with step surfaces (112), two ends of the plate spring (2) are lapped on the step surfaces (112), and the other side of each conductive sheet (11) is provided with a first connecting portion (12) connected with the fixing member (4).

3. The contact structure according to claim 2, wherein the magnetic conductive member (3) is a U-shaped member, the bottom of the magnetic conductive member (3) is embedded in the accommodating groove (111), two side walls of the magnetic conductive member (3) are lapped on two ends of the conductive sheet set (1), and two ends of the magnetic conductive member (3) are respectively provided with a second connecting portion (31) connected with the fixing member (4).

4. A contact structure according to claim 3, characterized in that said first connection portion (12) comprises a first tab (121) connected to a side wall of said conductive plate (11), said first tab (121) being provided with a first mounting slot (122);

the second connecting part (31) comprises a second lug (311) connected with the end part of the magnetic conduction member (3), and the second lug (311) is provided with a second mounting groove (312) corresponding to the first mounting groove (122);

the fixing piece (4) comprises a bolt (41), and the bolt (41) is inserted into the second mounting groove (312) and the first mounting groove (122).

5. The contact structure according to claim 4, characterized in that the plug (41) comprises a plug body (411) and a stopper (412) arranged on the plug body (411), wherein the stopper (412) prevents the plug body (411) from separating from the second mounting groove (312) and the first mounting groove (122) when the plug body (411) is inserted into the second mounting groove (312) and the first mounting groove (122).

6. The contact structure according to claim 5, wherein the second protrusion (311) protrudes from the first protrusion (121), the limiting member (412) comprises two resilient pieces, one end of the two resilient pieces close to each other is elastically connected to the plug pin body (411), the two resilient pieces are arranged in a staggered manner, one side wall of the second mounting groove (312) at any end of the magnetic conductive member (3) is shorter than the other side wall of the second mounting groove, so that one of the resilient pieces passes through and abuts against the side wall of the second protrusion (311) at the other end of the magnetic conductive member (3), and the other resilient piece can elastically deform to pass through the second mounting groove (312) at the insertion side of the other magnetic conductive member (3) and abut against the side wall of the second protrusion (311) at the insertion side of the other magnetic conductive member (3).

7. The contact structure according to claim 3, wherein the second connecting portion (31) includes a movable groove (313) extending from end portions of two sidewalls of the magnetic conductive member (3) to a bottom of the magnetic conductive member (3), the fixing member (4) includes an annular fixing hoop (42), the fixing hoop (42) is sleeved outside the two leaf springs (2), and the fixing hoop (42) is clamped in the movable groove (313).

8. The contact structure according to claim 2, characterized in that a boss (32) is provided on one side of the magnetic conductive member (3) facing the plate spring (2), a plurality of snap teeth (21) are respectively provided on both ends of the plate spring (2), the snap teeth (21) are lapped on the corresponding step surface (112) of the conductive sheet (11), and the plate spring (2) is in contact with the boss (32).

9. The contact structure according to claim 2, wherein a first arc surface (13) is concavely arranged at one end edge of the conductive sheet (11) at one side of the first connecting portion (12), the first arc surface (13) is used for being connected with the body end bus bar (100) in a matching manner, a second arc surface (14) is convexly arranged at the other end edge of the conductive sheet (11), and the second arc surface (14) is connected with the drawer base bus bar (200) in a matching manner.

10. Circuit breaker, characterized in that it comprises a body end busbar (100), a drawer base busbar (200) and a contact structure according to any one of claims 1 to 9.

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