CN119008324A

CN119008324A - Contactor and circuit system

Info

Publication number: CN119008324A
Application number: CN202410950308.6A
Authority: CN
Inventors: 李凡; 薛亚男; 尚博建
Original assignee: Zhiheji Shanghai Electrical Technology Co ltd
Current assignee: Zhiheji Shanghai Electrical Technology Co ltd
Priority date: 2024-07-16
Filing date: 2024-07-16
Publication date: 2024-11-22

Abstract

A contactor and a circuit system, the contactor comprises a shell provided with an arc extinguishing cavity; the fixed contact piece, the movable contact piece and the arc extinguishing grid are arranged in the arc extinguishing cavity; an arc striking mechanism. The two static contact pieces are oppositely arranged and comprise a static contact piece contact section positioned in the arc extinguishing cavity, a leading-out section extending out of the shell from one end of the static contact piece contact section and a static contact piece arc striking section turning over upwards outwards from the other end of the static contact piece contact section; the movable contact piece is arranged below the two static contact pieces and comprises a movable piece arc-guiding section and movable piece contact sections extending from two ends of the movable piece arc-guiding section, and the movable piece contact sections can be detachably contacted with the static piece contact sections of the two static contact pieces; the arc extinguishing grid is arranged above the static piece arc guiding section and is used for extinguishing two sections of electric arcs generated when the moving piece contact section is separated from the static piece contact section; the arc striking mechanism is formed with a guiding magnetic field which is used for driving the electric arc to transfer to the arc extinguishing grid along the movable sheet arc striking section and the static sheet arc striking section. The invention can realize the arc extinction of two sections of arcs by only arranging one set of arc extinction system, thereby simplifying the arc extinction system.

Description

Contactor and circuit system

Technical Field

The invention belongs to the field of circuit system control, and particularly relates to a contactor and a circuit system. The contactor is generally applied to a high voltage Power Distribution Unit (PDU) and a battery pack break unit (BDU) of an energy subsystem.

Background

The battery pack breaking unit BDU (Battery Disconnect Unit) is specially designed for the inside of the battery pack, and is one type of high-voltage power distribution unit PDU (Power Distribution Unit). From the electrical composition point of view, the main components of the BDU product comprise a contactor, a fuse, a battery management unit BMU (Battery Management Unit), a pre-charging resistor, a current collecting element, a copper bar, a connector, a wire harness assembly and the like.

With the continuous development of new energy automobile technology, the technology of BDU is also continuously advancing, and the future BDU will be developed towards several directions: higher voltage: with the advancement of battery technology, the voltage of the battery system will be continuously increased, and the BDU will also need to support higher voltages; higher power: in order to improve the performance of the new energy automobile, the BDU needs to support higher power; more intelligent: the BDU is more intelligent, and can work together with other components such as a Battery Management System (BMS) better, so that the overall efficiency and the safety of the battery system are improved.

The contactor serving as the main component of the BDU product comprises a movable contact piece and a static contact piece. When the contactor works, the brake contact piece is controlled by the driving mechanism to move up and down to be contacted with the static contact piece to be closed or separated from the static contact piece, so that a working circuit is connected or disconnected. In the separation process of the movable contact, because the battery has huge energy, the phenomenon of arc discharge can occur, in order to extinguish the arc, an arc extinguishing cavity is usually arranged on the side surface of the movable contact and the side surface of the static contact, and the arc is pulled into an arc extinguishing grid sheet in the arc extinguishing cavity through an induction magnetic field, so that the arc is rapidly cooled and extinguished. For example, chinese patent No. CN201610938374.7 discloses a dc contactor, chinese patent No. CN201520017940.1 discloses a contactor arc extinguishing structure, both disclose arc extinguishing mechanisms with arc extinguishing bars disposed on both sides of the moving and static contact pieces of the contactor, and disclose that the arc is guided to the arc extinguishing bars by a magnetic field.

However, the arc extinguishing structure in the prior art is arranged on two side surfaces of the connecting part of the movable contact and the static contact, and two sets of arc extinguishing mechanisms are required to be arranged inside the contactor, so that the structure of the contactor is complicated.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a contactor and a circuit system, so as to solve the problems of complicated structure, unreasonable structural design, unreasonable striking direction, and easy damage to contactor elements caused by arc in the prior art.

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

a contactor, comprising:

The shell is internally provided with an arc extinguishing cavity;

The two opposite static contact pieces are arranged in the arc extinguishing cavity and comprise a static contact piece contact section positioned in the arc extinguishing cavity, a leading-out section extending out of the shell from one end of the static contact piece and a static contact piece arc striking section turned over from the other end of the static contact piece to the upper direction;

The movable contact piece is arranged in the arc extinguishing cavity and below the two static contact pieces, and comprises two movable contact piece contact sections at two ends and a movable contact piece arc-guiding section in the middle, wherein the movable contact piece can be detachably contacted with the static contact piece contact sections of the two static contact pieces;

the arc extinguishing grid is arranged above the static piece arc guiding section and is used for extinguishing two sections of electric arcs generated when the moving piece contact section and the static piece contact section are separated;

The arc striking mechanism is used for forming a guide magnetic field, and the guide magnetic field is used for applying Lorentz force to the two sections of electric arcs, so that the two sections of electric arcs are gradually transferred to the arc extinguishing grid along the moving sheet arc striking section and the static sheet arc striking section.

As one embodiment of the invention, the arc striking mechanism comprises two magnetic steels which are oppositely arranged, opposite magnetic poles of the two magnetic steels are opposite, the movable contact piece and the static contact piece are positioned between the two magnetic steels, and the guiding magnetic field is formed between the two magnetic steels and is used for applying inward initial lorentz force to the two sections of electric arcs.

As one embodiment of the present invention, two ends of the two magnetic steels are respectively connected through a magnetic conduction frame.

As one implementation mode of the invention, a side groove surrounding the arc extinguishing cavity is arranged in the side wall of the shell, and the magnetic steel and the magnetic conduction frame are embedded in the side groove.

As one embodiment of the present invention, the static sheet arc striking section includes a first section, a second section and a third section which are sequentially connected from the other end of the static sheet contact section, the first section, the second section and the third section are gradually folded along the outer upper direction, the folding angle of the first section and the second section is larger than the folding angle of the static sheet contact section and the first section and the folding angle of the second section and the third section, wherein the interval between the two static contact sheets is set so that the two sections of electric arcs can be connected at the second section.

As one embodiment of the present invention, the arc extinguishing grid comprises two mounting plates arranged opposite to each other and a plurality of grid plates connected between the two mounting plates, wherein the grid plates are arranged at intervals.

As one embodiment of the present invention, the plurality of gate sheets form two inclined steps corresponding to the static sheet arc striking section at the bottom of the arc extinguishing gate.

As one embodiment of the present invention, the inclination angle of the inclined step corresponds to the turnover angle of the stationary blade arc segment.

As one embodiment of the present invention, the housing includes an upper housing and a lower housing, a first chamber is disposed in the upper housing, a second chamber is disposed in the lower housing, and the upper housing is connected to the lower housing, so that the first chamber and the second chamber enclose the arc extinguishing chamber.

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

A circuit system comprising the contactor.

Compared with the prior art, the invention has the beneficial effects that:

1. The arc striking mechanism, the movable sheet arc striking section and the static sheet arc striking section can simultaneously connect the electric arcs with different directions into a whole and guide the electric arcs to the arc extinguishing grid above the static sheet arc striking section for arc extinguishing. Therefore, arc extinction can be realized only by arranging one set of arc extinction system, and the arc extinction system of the contactor is simplified;

2. according to the invention, the bottom of the arc extinguishing gate is provided with the inclined ladder opposite to the static piece arc striking section, so that the moving path of an arc is indirectly shortened, and the arc extinguishing efficiency of an arc extinguishing system is improved;

3. According to the invention, the arc is guided to the upper part through the arc striking mechanism, the movable sheet arc striking section and the static sheet arc striking section, so that the arc is far away from the driving mechanism below, and the possibility of damaging the driving mechanism at high temperature generated by the arc is further reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic perspective view of a contactor according to an embodiment of the present invention;

FIG. 2 is an exploded view of a contactor according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view of the contactor with the solenoid de-energized;

FIG. 4 is a cross-sectional view of the contactor with the solenoid energized and the protection switch not activated;

FIG. 5 is a cross-sectional view of the contactor at the start of the protection switch;

FIG. 6 is a cross-sectional perspective view of a contactor according to an embodiment of the invention;

FIG. 7 is a cross-sectional perspective view of another orientation of a contactor according to an embodiment of the invention;

fig. 8 is a bottom view of the lower housing of the contactor of an embodiment of the invention;

FIG. 9 is an enlarged view of the lower portion of FIG. 4;

Fig. 10 is an enlarged view of a portion a in fig. 9;

FIG. 11 shows a magnetic field conduction pattern of a drive mechanism of a contactor;

FIG. 12 is a diagram showing the connection structure of the movable contact and the clamping mechanism, and the clamping mechanism and the driving mechanism of the contactor according to an embodiment of the present invention;

fig. 13 is a cross-sectional view of a clamping mechanism of a contactor according to an embodiment of the present invention clamping a movable contact;

FIG. 14 is a top cross-sectional view of a contactor (with the protection switch not activated and the piston portion in the initial position) according to an embodiment of the invention;

FIG. 15 is a top cross-sectional view of a contactor (with the protection switch not activated and the piston portion in the initial position) according to another embodiment of the invention;

FIG. 16 is a top cross-sectional view of a contactor (with a protection switch activated and a piston portion in a set position) according to another embodiment of the invention;

FIG. 17 is a top cross-sectional view of a contactor (with the protection switch not activated and the piston portion in the initial position) according to yet another embodiment of the invention;

FIG. 18 is an enlarged view of the middle portion of FIG. 5;

FIG. 19 is a middle cross-sectional view in another direction of a contactor according to an embodiment of the invention;

Fig. 20 is a cross-sectional view of an arc extinguishing system of a contactor according to an embodiment of the invention

FIG. 21 is a perspective view of the structure of the contactor according to an embodiment of the invention with the housing removed;

Fig. 22 is a schematic diagram of the operation of an arc extinguishing system according to an embodiment of the present invention;

FIG. 23 shows a magnetic field diagram of an arc striking mechanism from a side view;

FIG. 24 shows a magnetic field diagram of the arc striking mechanism from a top view;

FIG. 25 is a schematic view of a static contact and a moving contact according to another embodiment of the present invention;

fig. 26 is a schematic structural diagram of a stationary contact and a movable contact according to another embodiment of the present invention.

Reference numerals illustrate:

1. the device comprises a shell, 11, an upper shell, 111, mounting grooves, 112, a first chamber, 113, positioning columns, 114, a heat dissipation structure, 12, a lower shell, 121, a second chamber, 122, a third chamber, 123, side grooves, 13, a bottom cover, 14 and a connecting piece;

2. The protection switch, 21, the guide sleeve, 211, the locking part, 212, the directional chute, 213, the stop step, 22, the driving part, 221, the triggering part, 222, the explosion part, 23, the spacer, 24, the separation part, 241, the piston part, 242, the assembly groove, 243, the through hole, 244, the directional slide block, 245, the sliding block, 2451, the accommodating groove, 246, the extension rod, 2461, the connecting part, 2462, the rod part, 249, the telescopic piston, 2491, the top plate, 2492, the bottom plate, 2493, the side plate, 2494, the accommodating cavity, 2495, the sliding rod, 2496, the chute, 25 and the elastic piece;

3. The magnetic pole piece comprises a driving mechanism 31, a magnetic pole piece 32, a yoke iron 33, an electromagnetic coil 331, a lead-out electrode piece 34, a magnetic conduction sleeve 35, a sliding sleeve 36, a movable iron core 361, a movable iron core inner groove 362, a threaded hole 37, a static iron core 371, a static iron core inner groove 38, a driving rod 381, a screw rod part 39 and a reset spring;

4. stationary contact, 41, first contact; 42. the device comprises a lead-out section 43, a static sheet contact section 44, a static sheet arc-guiding section 441, a first section 442, a second section 443, a third section 45 and a positioning hole;

5. the movable contact piece, 51, the second contact, 52, the movable contact piece, 53 and the movable contact piece arc-guiding section;

6. clamping mechanism 61, support block 62, clamping frame 621, clamping piece 622, extension leg 63, connecting piece 64, support spring;

7. Arc extinguishing grids, 71, mounting plates, 72, grid plates, 73 and inclined steps;

8. the device comprises an arc striking mechanism 81, magnetic steel 82, a magnetic conduction frame 821, an attaching end part 822 and a bending part.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention. Furthermore, it should be understood that the detailed description is presented herein for purposes of illustration and description only, and is not intended to limit the invention.

In the present invention, unless otherwise indicated, terms of orientation such as "upper", "lower", "left", "right", "front", "rear" are generally used to refer to the directions of the upper, lower, left and right sides of the device in actual use or operation, and are specifically shown in the drawings.

It should be noted that the following description order of the embodiments is not intended to limit the preferred order of the embodiments of the present application. In the following embodiments, the descriptions of the embodiments are focused on, and for the part that is not described in detail in a certain embodiment, reference may be made to the related descriptions of other embodiments.

The traditional contactor (taking an electromagnetic contactor as an example) consists of a coil, a static iron core, a movable iron core, a push rod, a reset spring, a movable contact piece, a static contact piece and the like. The working principle is as follows: when the coil is electrified, the coil current generates a magnetic field, and the generated magnetic field enables the static iron core to generate electromagnetic attraction to attract the movable iron core to approach the static iron core, so that a push rod connected with the movable iron core pushes the movable contact to be in contact connection with the static contact, and a circuit is closed; when the coil is powered off, the magnetic field disappears (electromagnetic attraction disappears), and the movable iron core is far away from the static iron core under the action of the elastic force of the reset spring, so that the push rod connected with the movable iron core drives the movable contact piece to be separated from the static contact piece, and the circuit is disconnected. In the process of separating the movable contact from the static contact, because of huge energy existing in a battery or a power supply, an electric arc can be generated between the contacts of the movable contact and the static contact, and if the electric arc cannot be extinguished in time, parts of the contactor such as the movable contact and the static contact can be burnt.

Therefore, in order to extinguish the arc, the conventional contactor is generally provided with an arc extinguishing system, for example, an arc extinguishing chamber is arranged at the side surface of a connecting point of the moving contact and the static contact, and the arc is pulled into an arc extinguishing grid plate in the arc extinguishing chamber through an induction magnetic field, so that the arc is rapidly cooled and extinguished. However, the structural design of the arc extinguishing system of the conventional contactor has a plurality of unreasonable points.

Based on this, the invention discloses a contactor with more improved structural design of an arc extinguishing system, and the contactor of the invention is described in detail below.

As shown in fig. 1 to 26, an embodiment of the present invention provides a contactor of an integrated self-locking type protection switch, the contactor including a housing 1; and the driving mechanism 3, the clamping mechanism 6, the movable contact 5, the static contact 4, the arc extinguishing grid 7 and the self-locking protection switch 2 are sequentially arranged in the shell 1 from bottom to top. The two static contact pieces 4 are arranged in the shell 1at intervals, and the static contact pieces 4 are used for being connected with an external circuit system; the driving mechanism 3 is used for driving the movable contact 5 to contact with or separate from the static contact 4 so as to connect or disconnect the two static contacts 4; the clamping mechanism 6 is used for connecting the movable contact 5 with the driving mechanism 3; the protection switch 2 is connected with external signal transmission equipment and is used for striking the movable contact piece 5 to separate the movable contact piece 5 from the static contact piece 4 after receiving a signal transmitted by the signal transmission equipment, and the protection switch 2 is self-locked after striking the movable contact piece 5 to abut against the stop contact piece 5 so as to limit the stop contact piece 5 to be connected with the static contact piece 4 again; the arc extinguishing grid 7 is used for extinguishing an electric arc generated when the movable contact piece 5 is separated from the static contact piece 4; the contactor furthermore comprises an arc striking mechanism 8 for guiding said arc to the arc chute 7.

As shown in fig. 1 to 9, in a specific embodiment, the housing 1 includes an upper housing 11, a lower housing 12, and a bottom cover 13, the upper housing 11 is connected to the lower housing 12 through a connecting member 14, and the bottom cover 13 is clamped to a bottom opening of the lower housing 12. The connecting member 14 may be, for example, a bolt or a rivet. The upper case 11 is provided with a mounting groove 111 at an upper portion and a first chamber 112 at a lower portion, and the lower case 12 is provided with a second chamber 121 at an upper portion and a third chamber 122 at a lower portion, wherein the first chamber 112 communicates with the second chamber 121. Thus, the housing is provided as a split structure including the upper housing, the lower housing, and the bottom cover, and the assembly of the contactor can be facilitated. Here, the case may not adopt the above-mentioned split structure, but may be an integral structure or other types of split structures, and the present invention is not limited thereto. In addition, as shown in fig. 1 and 2, the outer wall of the upper housing 1 is further provided with a heat dissipation structure 114, and the heat dissipation structure 114 may be, for example, a plurality of heat dissipation strips that are disposed at intervals, and the heat dissipation structure 114 is used for reducing the high temperature generated when the contactor is in arc extinction.

With continued reference to fig. 1-9, in one embodiment, the protection switch 2 is mounted to the mounting recess 111, the arc chute 7 and the two stationary contacts 4 are mounted to the first chamber 112, the movable contact 5 and the clamping mechanism 6 are mounted to the second chamber 121, and the driving mechanism 3 is mounted to the third chamber 122. The second chamber 121 has a certain depth to ensure that the movable contact 5 can move up and down in the second chamber 121.

Hereinafter, the driving mechanism 3 of the present invention will be described, and in this embodiment, the driving mechanism 3 is an electromagnetic driving mechanism. The driving mechanism 3 may be any other type of driving mechanism such as a pneumatic driving mechanism or a hydraulic driving mechanism in the prior art, as long as the driving function of the movable contact can be achieved, and only the electromagnetic driving mechanism used in the embodiment of the present invention is described below, which is not limited to this.

As shown in fig. 2 to 12, in a specific embodiment, the driving mechanism 3 includes a pole piece 31, a U-shaped yoke 32, an electromagnetic coil 33, a magnetically permeable sleeve 34, a slide sleeve 35, a movable iron core 36, a stationary iron core 37, a driving lever 38, and a return spring 39. Wherein the yoke 32 includes a bottom plate and two side plates extending vertically upward from both ends of the bottom plate, and the pole pieces 31 are coupled to upper ends of the two side plates of the yoke 32 such that the yoke 32 and the pole pieces 31 enclose a rectangular mounting frame. In addition, a central hole is formed in the bottom plate of the yoke 32, the bottom of the magnetic sleeve 34 is nested in the central hole of the bottom plate, and the top of the magnetic sleeve 34 is spaced from the pole piece 31 by a certain distance. The electromagnetic coil 33 includes a coil bobbin, a coil (not shown) wound around the coil bobbin, and an extraction electrode plate 331 disposed on the coil bobbin and connected to the coil, the extraction electrode plate 331 extending out of the housing 1, the coil being connected to an external power supply device through the extraction electrode plate 331, the coil bobbin being connected between the yoke 32 and the pole piece 31 and being sleeved on the magnetic conductive sleeve 34. Specifically, the coil bobbin includes small-diameter sections and large-diameter sections vertically connected between the yoke 32 and the pole pieces 31, and flanges at both ends; the large-diameter section is sleeved on the magnetic conduction sleeve 34, the inner diameter of the small-diameter section is the same as that of the magnetic conduction sleeve 34, and the small-diameter section and the magnetic conduction sleeve 34 are communicated together to form an inner cavity for installing the sliding sleeve 35. The top flange of the sliding sleeve 35 is connected to the lower surface of the pole piece 31, and the cylindrical portion of the sliding sleeve 35 is mounted in the coil bobbin (small diameter section) and the magnetic conductive sleeve 34. The movable iron core 36 and the stationary iron core 37 are arranged in the sliding sleeve 35; a flange is arranged above the static iron core 37, the static iron core 37 is fixedly connected to the central hole of the magnetic pole piece 31 through the flange, and the movable iron core 36 is slidably arranged below the static iron core 37; the lower end of the driving rod 38 is connected with the movable iron core 36, and the upper end of the driving rod passes through a through hole in the center of the static iron core 37 and is connected with the movable contact 5; a return spring 39 is arranged between the movable iron core 36 and the static iron core 37, and the return spring 39 is sleeved on the driving rod 38. The pole piece 31, yoke 32, magnetic sleeve 34, moving core 36, and stationary core 37 are collectively referred to as magnetic conductors, and a magnetic field is formed in these magnetic conductors when the electromagnetic coil 33 is energized. As shown in fig. 11, the conducting direction of the magnetic field is indicated by the dotted arrow, the electromagnetic coil 33 generates magnetic flux after being energized, and a magnetic field is established in the surrounding magnetic conductive member, and the magnetic field is conducted along the path of the dotted arrow, wherein at the position of the dotted rectangular frame, because a gap exists between the stationary core 37 and the movable core 36, the two ends of the gap (the lower end of the stationary core 37 and the upper end of the movable core 36) generate different polarities of N pole and S pole, and the different magnetic poles generate magnetic attraction force, so that the movable core moves upwards until being connected with the stationary core (i.e., the gap is closed).

Wherein, actuating mechanism's theory of operation does: when the electromagnetic coil 33 is energized, the coil current generates a magnetic field (i.e., a magnetic field conducted along a dotted arrow is formed in the magnetic conductive member), and the generated magnetic field attracts the movable iron core 36 to slide upwards by the stationary iron core 37, so that the driving rod 38 connected with the movable iron core 36 drives the movable contact 5 to move in a direction approaching the stationary contact 4, and the movable contact 5 is in contact connection with the stationary contact 4, thereby closing the circuit (i.e., the contactor is switched from the state of fig. 3 to the state of fig. 4); when the coil is deenergized, the magnetic field disappears, and the return spring 39 drives the movable iron core 36 to slide downwards, so that the driving rod 38 connected with the movable iron core 36 drives the movable contact 5 to move away from the stationary contact 4, and the movable contact 5 is disconnected from the stationary contact 4, thereby disconnecting the circuit (i.e., the contactor is switched from the state of fig. 4 to the state of fig. 3).

As shown in fig. 9 and 10, in a specific embodiment, the movable core 36 is provided with a movable core inner groove 361, the stationary core 37 is provided with a stationary core inner groove 371, and one end of the return spring 39 is connected to the movable core inner groove 361 and the other end of the return spring is connected to the stationary core inner groove 371. The movable core 36 is further provided with a screw hole 362 located below the movable core inner groove 361, and a screw portion 381 is provided at the lower end of the drive lever 38, and the screw portion 381 is screwed with the screw hole 362. Accordingly, the driving lever 38 is adjustably connected to the movable iron core 36 via the screw portion 381, so that the initial distance between the movable contact 5 and the stationary contact 4 can be adaptively adjusted to meet the assembly accuracy of the contactor.

As shown in fig. 9 to 13, in a specific embodiment, the upper end of the driving lever 38 is connected to the movable contact 5 through the clamping mechanism 6. Specifically, the clamping mechanism 6 includes: a support block 61, the upper end of the driving rod 38 being embedded in the support block 61; the clamping frame 62 is erected above the supporting block 61, the clamping frame 62 comprises a clamping piece 621, and extension supporting legs 622 extending downwards from the edges (four corners) of the clamping piece 621, and the tail ends of the extension supporting legs 622 are embedded in the supporting block 61; a connection piece 63 provided under the grip piece 621; a support spring 64 provided between the engagement piece 63 and the support frame 62. The middle section of the movable contact 5 (the movable contact guiding section 53 described later) is clamped between the clamping piece 621 and the connecting piece 63, and the supporting spring 64 provides a supporting force for the connecting piece 63 so that the connecting piece 63 and the clamping piece 621 stably clamp the movable contact 5, and meanwhile, the supporting spring 64 can play a buffering role when the protective switch 2 separates the movable contact 5 from the static contact 4.

The clamping mechanism 6 may be replaced by any other clamping mechanism of the prior art, as long as the function of connecting the movable contact 5 and the driving lever 38 can be achieved, and the above is just one embodiment of the present invention. Of course, the movable contact 5 and the driving rod 38 may be directly connected without the clamping mechanism 6, so long as the driving rod 38 can drive the movable contact 5 to connect or disconnect the stationary contact 4, and the present invention is not limited thereto.

As shown in fig. 2 to 9 and fig. 18 to 26, in a specific embodiment, the stationary contact 4 includes an extraction section 42, a stationary contact section 43, and a stationary arc striking section 44, which are sequentially connected. The stationary blade contact section 43 and the stationary blade arc striking section 44 are disposed within the first chamber 112; the lead-out section 42 extends out of the housing from one end of the stationary blade contact section 43 (i.e., the end remote from the interior of the housing) for connection to circuitry; the stationary blade arc striking section 44 is folded over from the other end of the stationary blade contact section 43 (i.e., the end near the inside of the housing) in an outward upward direction, i.e., is disposed obliquely toward the housing sidewall. The two static contact pieces 4 are opposite along the central axis of the contactor and are arranged at intervals, so that the two static contact piece arc striking sections 44 are formed into a V-shaped structure with an opening at the lower end.

Further, positioning grooves are formed in two sides of the upper opening of the lower shell 12, and the static contact 4 is arranged in the positioning grooves; positioning columns 113 are arranged on two sides of the lower opening of the upper shell 11, positioning holes 45 corresponding to the positioning columns 113 are arranged between the leading-out sections 42 and the static sheet contact sections 43 of the static contact sheets 4, and when the upper shell 11 is mounted on the lower shell 12, the positioning columns 113 are embedded into the positioning holes 45. Thereby, the stationary contact 4 is fixed to the housing 1 by the positioning groove and the positioning column. Of course, the stationary contact 4 may be fixed to the housing 1 by other mounting methods, such as bonding, bolting, riveting, etc., which is not limited to the present invention. The connecting mode of the positioning groove and the positioning column can reduce the installation steps, and the positions of the static contact can be limited simultaneously only by fixing the upper shell and the lower shell. In addition, the leading-out terminal 42 of the static contact 4 is provided with a connecting hole which is convenient for connecting with other structures in the circuit system.

As shown in fig. 2 to 9 and fig. 18 to 26, in a specific embodiment, the movable contact 5 is disposed below the two stationary contacts 4, and includes two movable contact sections 52 at both ends and a movable contact section 53 connected between the two movable contact sections 52. The bottom of the static contact section 43 of the static contact 4 is provided with a first contact 41, and the top of the moving contact section 52 of the moving contact 5 is provided with a second contact 51 corresponding to the first contact 41. The movable contact 5 is detachably contacted with the stationary contact 4 by the second contact 51 on the movable contact section 52 and the first contact 41 on the stationary contact section 43. Specifically, when the movable contact 5 moves upward, the second contact 51 on the movable contact section 52 contacts the first contact 41 on the stationary contact section 43, so that the movable contact 5 connects the two stationary contacts 4 to complete the circuit; when the movable contact 5 moves downward, the second contact 51 is separated from the first contact 41, thereby opening the two stationary contacts 4 to open the circuit. The static piece arc-guiding section 44 and the moving piece arc-guiding section 53 are used for being matched with the arc-guiding mechanism 8 so as to guide an arc generated when the moving piece contact section 52 is separated from the static piece contact section 43 to the arc-extinguishing grid 7, and the arc is cooled and extinguished after entering the arc-extinguishing grid 7.

Hereinafter, how the contactor of the present invention is configured to perform arc extinction will be described in detail.

As described above, the stationary contact sections 43 of the two stationary contacts 4 are in separable contact with the moving contact sections 52 at the two ends of the moving contact 5, respectively, so that when the moving contact 5 is separated from the stationary contact 4, two arcs are generated (i.e., one arc is generated between the stationary contact section 43 of one stationary contact and the moving contact section 52 at one end, and one arc is also generated between the stationary contact section 43 of the other stationary contact and the moving contact section 52 at the other end), and the current directions of the two arcs are opposite. Specifically, taking fig. 22 (red arrow in the drawing represents the current direction) as an example, since the movable contact 5 is disposed under the two stationary contacts 4, and the current direction is constant, that is, the current flows from the stationary contact on the left side to the stationary contact on the right side in fig. 22 along the movable contact, the current direction will be turned downward when the current flows from the stationary contact on the left side to the movable contact, and the current in the movable contact will be turned upward when the current flows from the movable contact to the stationary contact on the right side again. Therefore, when the movable contact 5 is separated from the stationary contact 4, the current direction of the arc generated on the left side is downward, and the current direction of the arc generated on the right side is upward.

For this purpose, the present invention realizes the arc extinction of the two-stage arc with different directions by the following arc extinction system.

In one embodiment, as shown in fig. 2 to 9 and fig. 18 to 26, the arc extinguishing system mainly comprises a first chamber 112 and a second chamber 121 of the housing 1; the arc extinguishing grid 7 and the two static contact pieces 4 are arranged in the first cavity 112, and the arc extinguishing grid 7 is arranged above the static contact piece arc striking section 44 of the static contact piece 4; a movable contact 5 disposed in the second chamber 121; and the arc striking mechanism 8. Wherein, the two static contact pieces 4 and the movable contact piece 5 generate electric arcs when separated; the first chamber 112 and the second chamber 121 serve as arc extinguishing chambers of an arc extinguishing system; the static sheet arc striking section 44 of the static contact sheet 4, the movable sheet arc striking section 53 of the movable contact sheet 5 and the arc striking mechanism 8 are used for guiding the arc to deflect so as to move to the arc extinguishing grid 7; the arc chute 7 serves to cool down and extinguish the arc.

Further, the striking mechanism 8 is configured to form a guiding magnetic field for applying lorentz force to the two-segment arc, so that the two-segment arc is gradually transferred to the arc extinguishing grid 7 along the moving-sheet arc-guiding segment 53 and the stationary-sheet arc-guiding segment 44. Specifically, the direction of the induction line of the guiding magnetic field is orthogonal to the current direction of the arc, and an inward initial lorentz force can be applied to the two-stage arc. Taking fig. 22 to 24 as an example, in the drawings, red arrows represent current directions, blue arrows represent magnetic induction line directions, and yellow arcs represent deflection trajectories of arcs. The direction of the current is from left to right, and the guiding mechanism 8 is set so that the direction of the magnetic induction line of the guiding magnetic field formed by the guiding mechanism is from front to back, at this time, according to the left hand rule, the left side arc receives the right initial lorentz force, and the right side arc receives the left initial lorentz force, namely, the two arcs receive the inward initial lorentz force. And then both the two electric arcs begin to deflect inwards along the moving sheet arc-striking section 53 under the action of lorentz force (namely, the left electric arc deflects along the anticlockwise direction and the right electric arc deflects along the clockwise direction), so that the current direction of the electric arcs inclines inwards accordingly, and the lorentz force direction of the electric arcs is always perpendicular to the current direction due to the unchanged magnetic induction line direction, so that the electric arcs are sequentially transferred to the arc-extinguishing grid 7 along the moving sheet arc-striking section 53 and the static sheet arc-striking section 44 under the action of lorentz force, namely, the electric arcs can deflect to the arc-extinguishing grid 7 continuously under the action of a guiding magnetic field until the electric arcs are extinguished in the arc-extinguishing grid 7.

The movement path of the arc can be divided into three phases, namely, the first phase: the movable contact piece 5 is separated from the fixed contact piece 4, an electric arc is formed between the movable contact piece contact section 52 and the fixed contact piece 43, the electric arc deflects inwards and upwards along the movable contact piece arc section 53 under the action of a guiding magnetic field formed by the guiding mechanism 8 (namely, left electric arc deflects anticlockwise and right electric arc deflects clockwise), and at the stage, the other ends of the two electric arcs (the end connected with the movable contact piece) gradually approach along the movable contact piece arc section 53; and a second stage: one end of the two-section arc (i.e. the end connected with the static contact piece) deflects to the connection position (i.e. the turnover angle position) of the static contact piece 43 and the static contact piece arc striking piece 44, and after the other end of the two-section arc approaches and contacts, the two-section arc is instantaneously stretched upwards to form an arc whole connected between the two static contact pieces (i.e. the connection position of the static contact piece 43 and the static contact piece arc striking piece 44); and a third stage: the whole arc is elongated to both sides along the static piece striking section 44 by the guiding magnetic field and moves upward into the arc extinguishing grid 7, and is cooled and extinguished in the arc extinguishing grid 7.

The arc striking mechanism, the movable piece arc striking section and the static piece arc striking section can simultaneously connect the electric arcs with different directions into a whole and guide the electric arcs to the arc extinguishing grid above the static piece arc striking section for arc extinguishing. Therefore, arc extinction can be realized only by arranging one set of arc extinction system, and the arc extinction system of the contactor is simplified.

In a specific embodiment, the arc striking mechanism 8 includes two magnetic steels 81 disposed opposite to each other, and the movable contact 5 and the stationary contact 4 are located between the two magnetic steels 81. The opposite magnetic poles of the two magnetic steels 81 are oppositely arranged, and when the current direction is from left to right as shown in fig. 22 to 24, the N pole of the magnetic steel 81 near the front side is opposite to the S pole of the magnetic steel 81 near the rear side; conversely, when the current direction is from right to left, the S pole of the magnetic steel 81 near the front side is opposite to the N pole of the magnetic steel 81 near the rear side. The guiding magnetic field formed between the two magnetic steels can apply inward initial lorentz force to the two electric arcs (since the magnetic induction lines between the two magnetic steels are uniformly distributed straight lines, according to the left hand rule, the two electric arcs can be subjected to the inward initial lorentz force).

In a specific embodiment, two ends of the two magnetic steels 81 are respectively connected through a U-shaped magnetic conduction frame 82, so that the movable contact piece 5 and the static contact piece 4 are enclosed in a square frame enclosed by the magnetic steels 81 and the magnetic conduction frame 82. The guiding magnetic field of the magnetic steel 81 is distributed along the magnetic conduction frame 82 through the arrangement of the magnetic conduction frame, so that the magnetic field strength of the guiding magnetic field can be enhanced, the arc deflection capacity of the magnetic field is further improved, and the arc extinguishing efficiency is improved.

Further, as shown in fig. 6 to 8 and fig. 18 to 19, the side wall of the second chamber 121 of the lower case 12 is also provided with a side groove 123, and the side groove 123 extends in the axial direction of the case 1 and is provided around the first chamber 112 and the second chamber 121. Wherein, magnet steel 81 and magnetic conduction frame 82 of striking mechanism 8 are held in side groove 123. Preferably, the side groove 123 is rectangular and has a chamfer. And chamfers corresponding to the chamfers of the side grooves 123 are respectively arranged at two corners of the U-shaped frame. The structural strength of the contactor is improved by arranging the chamfer. Of course, the magnetic steel 81 and the magnetic conduction frame 82 may be disposed in the arc extinguishing chamber, or disposed outside the housing, or not disposed on the contactor. The invention does not limit the position of the striking mechanism as long as it can provide a guiding magnetic field for the arc. Is arranged in the side groove only for facilitating assembly.

Preferably, as shown in fig. 6 to 8 and fig. 18 to 24, the height dimension of the magnetic steel 81 extends from the top of the leading end 44 to below the movable contact, and the magnetic guiding frame 82 includes a fitting end 821 fitting with the magnetic steel 81 and a bending part 822 connecting between the fitting ends 821. The height of the attaching end 821 is the same as that of the magnetic steel 81, and the width of the attaching end 821 is half of that of the magnetic steel 81, so that the four attaching end 821 are integrally attached to the surface of the magnetic steel 81, and the height dimension of the bending part 822 extends from the lower part of the static contact to the position lower than the bottom of the magnetic steel. Correspondingly, the side groove 123 is provided such that the depth of the portion accommodating the magnetic steel is greater than the depth of the portion accommodating the bent portion 822. The above only shows one embodiment as a combination of the magnetic steel and the magnetically permeable frame of the present invention. However, the present invention is not limited thereto, and the structures of the magnetic steel and the magnetic conductive frame may be other types.

In another embodiment, the arc striking mechanism 8 comprises a U-shaped magnet (not shown), and the movable contact 5 and the stationary contact 4 are located in the cavities of the U-shaped magnet. When the current direction is from left to right, the N pole end of the U-shaped magnet is positioned at the front side, and the S pole end is positioned at the rear side; conversely, when the current direction is from right to left, the S-pole end of the U-shaped magnet is positioned at the front side, and the N-pole end is positioned at the rear side. The guiding magnetic field formed in the concave cavity of the U-shaped magnet can apply inward initial Lorentz force to the two-stage arc (since the magnetic induction lines in the concave cavity of the U-shaped magnet are uniformly distributed straight lines, according to the left hand rule, the two-stage arc can be subjected to the inward initial Lorentz force).

In a specific embodiment, as shown in fig. 18 to 26, the arc extinguishing grid 7 is disposed above the static contact striking section 44 of the static contact 4, and the arc extinguishing grid 7 includes two mounting plates 71 disposed opposite to each other and a plurality of grid plates 72 disposed at intervals and perpendicularly connected between the two mounting plates 71. In addition, in order to cooperate with the static piece striking section 44 so that the elongated arc can smoothly enter the arc extinguishing grid 7, the plurality of grid pieces 72 are arranged in a stepwise manner from the middle to both sides (i.e., the lengths of the plurality of grid pieces 72 become gradually shorter from the middle to both sides), so that the plurality of grid pieces 72 are formed into two inclined steps 73 corresponding to the static piece striking section 44 at the bottom of the arc extinguishing grid 7. Wherein the size of the gap between the middle two gate plates 72 is larger than the diameter of the extension rod 246 described later. Thereby enabling the extension rod 246 to extend through the gap to the movable contact 5.

Preferably, the turnover angle of the static contact tab arc striking section 44 of the static contact tab 4 corresponds to (is the same as or substantially the same as) the inclination angle of the inclined step 73, and herein, the turnover angle of the static contact tab arc striking section 44 may be understood as the angle of the static contact tab arc striking section 44 and the static contact section 43, and the inclination angle of the inclined step 73 may be understood as the angle of the inclined step 73 and the static contact section 43. So that the spacing of the stationary blade striking section 44 from the inclined step 73 is substantially the same throughout to ensure that the arc is smoothly elongated and into the arc chute.

In a specific embodiment, the inclined step 73 is formed by a plurality of grid plates 72 with lengths gradually shortened from the middle to two sides, or the inclined step 73 is formed by a plurality of grid plates 72 with lengths from the middle to two sides being longer than each other or shorter than each other, so long as the bottom of the arc extinguishing grid is ensured to form an inclined step opposite to the arc striking section of the static plate, so that the arc can be elongated along the arc striking section of the static plate and enter the arc extinguishing grid, and the length setting of the grid plates 72 can be specifically set according to the arc extinguishing requirements of different products. The invention is not limited thereto.

In a specific embodiment, as shown in fig. 18 to 21, the static plate arc striking section 44 includes a first section 441, a second section 442, and a third section 443 that are sequentially connected from the other end of the static plate contact section 43. The first section 441 is turned upwards from the other end of the static sheet contact section 43, the second section 442 is turned outwards from the first section 441, and the third section 443 is turned outwards from the second section 442. The turnover angle between the first section 441 and the second section 442 is greater than the turnover angle between the third section 443 and the first section 441 and the turnover angle between the first section 441 and the stationary blade arc striking section 44. Furthermore, the distance between the two stationary contacts 4 is set such that the two arcs are connected when they are deflected to the second section 442, and the connection between the second section 442 and the third section 443 is in the same line as the lowest surface of the arc extinguishing bar 7. Therefore, the static piece arc striking section 44 is set to be the three-section gradually folded, and the folding angle between the first section 441 and the second section 442 is larger than the folding angle between the third section 443 and the first section 441 and the folding angle between the first section 441 and the static piece arc striking section 44, and the deflection path of the electric arc is improved by setting the static piece arc striking section to be three-section, so that the deflection process of the electric arc can be smoother and more stable.

In addition, in another specific embodiment, as shown in fig. 25, the static sheet arc striking section 44 may not be configured as the three-section, that is, only one section may be configured, that is, the static sheet arc striking section 44 may be directly folded along the static sheet contact section 43 in the upward and outward direction; or the static tab striking section 44 may be provided in two or four or more sections. The multi-section arc striking section is arranged for facilitating the deflection of the arc, the invention does not limit the number of the sections, and only the static sheet arc striking section is arranged to be inclined (turned outwards and upwards), so that the function of connecting two sections of the arc and elongating along the static sheet arc striking section can be realized.

In yet another embodiment, as shown in fig. 26, the stationary contact section 43 may be disposed to be inclined upwardly by a certain angle, and correspondingly, the movable contact section 52 may be disposed to be inclined downwardly by a corresponding angle, so as to ensure the contact area between the second contact 51 and the first contact 41. By arranging the stationary contact section 43 and the moving contact section 52 obliquely, the initial current direction of the arc is changed. The deflection path of the arc is reduced, thereby improving the arc extinguishing efficiency.

The protection switch 2 of the present invention will be described in detail with reference to various embodiments.

As shown in fig. 1 to 7 and 14 to 19, in a specific embodiment, the protection switch 2 is provided on the top of the housing 1 (i.e., in the mounting groove 111), and includes: the guide sleeve 21, the driving part 22 and the separating part 24 slidably sleeved in the guide sleeve 21, wherein the driving part 22 is used for selectively driving the separating part 24 to move to a set position so that the separating part 24 separates the movable contact piece 5 from the static contact piece 4. For example, the driving portion 22 is not started when the circuit is normal, and when the circuit is required to be disconnected as soon as possible, such as an abnormality of the circuit system or a collision of the vehicle, the driving portion 22 drives the separating portion 24 to separate the movable contact 5 from the stationary contact 4. Here, moving to the set position means that the separation portion moves to a position capable of striking the movable contact and breaking the connection of the movable contact and the stationary contact (i.e., the separation portion moves from the position in fig. 4 to the position in fig. 5).

With continued reference to fig. 1-7 and 14-19, in one embodiment, the drive portion 22 is secured to the top of the guide sleeve 21 and the separation portion 24 is slidably disposed below the drive portion 22. Here, the guide sleeve 21 may be a separate member provided in the mounting groove 111. The guide sleeve 21 may also be integrally formed with the housing 1, i.e. the drive part 22 and the separation part 24 are mounted directly in the housing 1.

With continued reference to fig. 1-7 and 14-19, in one particular embodiment, the drive portion 22 includes a trigger portion 221 and an explosive portion 222 disposed between the separation portion 24 and the trigger portion 221. Preferably, the explosion portion 222 is fixed to the triggering portion 221. The triggering part 221 is used for connecting with an external signal transmission device and receiving a signal transmitted by the signal transmission device, and the triggering part 221 triggers the explosion part 222 to explode according to the signal so as to drive the separation part 24 to move downwards and strike the movable contact piece 5, thereby separating the movable contact piece 5 from the static contact piece 4, wherein the signal transmission device can be used for transmitting a vehicle collision signal or a current overload signal and other abnormal devices of a vehicle body or a circuit; the explosion part 222 may be a substance that can generate an explosion impact force, such as an explosive gas or powder, and the triggering part 221 may be a device that can initiate the explosion of the explosion part, such as an ignition device, a detonation device, or a discharge device.

Here, after the movable contact 5 is struck by the separating portion 24 and disconnected from the stationary contact 4, if the electromagnetic coil 33 is still in the energized state, the movable contact 5 is pushed upward by the driving mechanism 3, and is connected again to the stationary contact 4, so that the circuit is again connected.

Therefore, in order to prevent the circuit from being connected again, the movable contact 5 and the stationary contact 4 are prevented from being connected again by the following locking means. Specifically, with continued reference to fig. 1 to 7 and 14 to 19, the inner wall of the guide sleeve 21 is provided with a locking portion 211, a stop step 213 is provided between the locking portion 211 and the inner wall of the guide sleeve 21, the locking portion 211 is provided at the lower portion of the guide sleeve 21 and corresponds to the set position, the locking portion 211 may be a concave region (including but not limited to a groove or an annular inner wall having a larger diameter than the inner wall of the guide sleeve 21, etc.) on the inner wall of the guide sleeve 21, and the stop step 213 is an upper side wall of the concave region; the separating portion 24 includes a telescopic member (a sliding block 245 and a side plate 2493 described below), the protection switch 2 is further provided with an elastic member 25, the elastic member 25 is connected with the telescopic member and is relatively fixed to the position of the separating portion 24 (that is, the elastic member 25 can move along with the separating portion 24), after the separating portion 24 moves to a set position and separates the movable contact 5 from the static contact 4, the elastic member 25 pops up to drive the telescopic member of the separating portion 24 to be clamped to the locking portion 211, and the telescopic member is clamped to the locking portion 211 and then is stopped by the stop step 213, so that the separating portion 24 cannot move upwards. Therefore, the elastic member 25, the locking portion 211 and the stop step 213 limit the telescopic member of the separating portion 24 at the set position, that is, when the driving mechanism 3 pushes the movable contact 5 upwards again, the separating portion 24 cannot slide upwards due to the limitation of the stop step 213, so that the movable contact 5 is blocked by the separating portion 24 when moving upwards, and the movable contact 5 and the stationary contact 4 can be prevented from being connected again.

Referring to fig. 1 to 7 and 14 to 17, this locking method is specifically as follows.

As shown in fig. 14, in a specific embodiment, the separating portion 24 includes a piston portion 241, the telescopic member is a sliding block 245, the piston portion 241 is slidably sleeved in the guide sleeve 21, and the driving portion 22 drives the piston portion 241 to the set position to strike the movable contact 5 so as to separate the movable contact 5 from the static contact 4. The piston portion 241 is provided with a through hole 243 extending in a radial direction, the sliding blocks 245 are slidably provided in the through hole 243, the sliding blocks 245 are provided at two ends of the through hole 243 at intervals, the elastic member 25 is connected between the two sliding blocks 245, and the locking portion 211 is preferably a circular groove having a diameter equal to that of the through hole 243. When the piston portion 241 is at the initial position (the position where the piston portion 241 is located in fig. 4, 14 and 15), the elastic member 25 is compressed (specifically, compressed by the sliding block 245 through the inner wall of the guide sleeve 21) in the through hole 243, and the two sliding blocks 245 are supported (specifically, one end of the sliding block 245 abuts against the inner wall of the guide sleeve 21 and the other end is supported by the elastic member 25) at both ends of the through hole 243; after the piston portion 241 is driven to the set position (the position where the piston portion 241 is located in fig. 5 and 16), the through hole 243 communicates with the lock portion 211, the elastic member 25 releases the elastic force and rebounds toward both ends of the through hole 243, thereby driving the slider 245 to be partially engaged with the lock portion 211, and the slider 245 is abutted by the stopper step 213 (the upper side wall of the lock portion 211) after being engaged with the lock portion 211, so that the piston portion cannot move upward. Thus, by engaging the slider 245 of the separating portion 24 with the lock portion 211 at the set position by the elastic member 25, the slider 245 is abutted against the stopper step 213, and the piston portion 241 can be restricted at the set position, that is, when the driving mechanism 3 pushes the movable contact 5 upward again, the movable contact 5 is prevented from being blocked by the piston portion 241, and the movable contact 5 and the stationary contact 4 are prevented from being connected again. Preferably, the elastic member 25 is a member which is deformable by an external force such as a compression spring or elastic rubber, and which returns to its original shape after the external force is removed.

The sliding blocks 245 are provided in two in the above embodiment. The sliding block 245 may be provided only in one, in which case the other sliding block 245 may be fixed to one end of the through hole 243, or the through hole 243 may be a bottomed hole extending in the radial direction, the sliding block 245 is provided at an orifice end of the bottomed hole, and the elastic member 25 is connected between the bottom of the bottomed hole and the sliding block 245. That is, the piston portion 241 may be restricted to the set position by only one slide block. The provision of two sliding blocks makes the restriction of the piston portion 241 more stable than one sliding block, and the provision of only one sliding block can reduce the number of parts and save the cost. More preferably, a second through hole (not shown) is provided below the through hole 243, and a slider and an elastic member are also provided in the second through hole, thereby increasing the number of the locking portions 211 accordingly. This can further improve the restriction stability of the piston portion 241. Further preferably, the second through hole may be disposed perpendicular to the through hole 243 in the radial direction, and the locking portions 211 of different angles may be added accordingly. This further improves the restriction stability by restricting the piston portion 241 in different directions.

As shown in fig. 14 to 17, in a preferred embodiment, the inner wall of the guide sleeve 21 is further provided with an axially extending orientation chute 212, and the outer wall of the piston portion 241 is provided with an orientation slide 244 slidably connected to the orientation chute 212, and the orientation slide 244 slides along the orientation chute 212 when the piston portion 241 moves downward. This prevents the piston portion 241 from rotating during movement, and the through hole 243 and the locking portion 211 cannot communicate accurately, so that the elastic member 25 cannot drive the slider 245 to be engaged with the locking portion 211.

It should be noted that, by providing the directional slider 244 and the directional chute 212 to make the piston portion 241 slide in a directional manner, the elastic member 25 may drive the sliding block 245 to be engaged with the locking portion 211, even if the directional sliding mechanism is not provided. The above-described directional sliding mechanism is provided for the purpose of improving the accuracy of locking. In addition, the accuracy of the locking can be improved in other ways, so that the sliding block 245 is accurately clamped to the locking portion 211. For example, in the above embodiment, the locking portion is provided as a circular groove having a diameter equal to the through hole 243, and the groove is also provided to have a diameter larger than the through hole 243, or the locking portion is provided as an annular groove around the inner wall of the guide sleeve 21 for one round, or the locking portion is provided as an annular inner wall having a diameter larger than the inner wall of the guide sleeve 21 (it can be understood that the locking portion is a lower portion of the guide sleeve 21, and the lower portion of the guide sleeve 21 has a diameter larger than the upper portion). By the mode, the opening of the locking part is larger than the through hole, so that the sliding block can be more smoothly stretched into the locking part.

As shown in fig. 14 to 17, more preferably, the lock portion 211 (in this case, a circular groove) is in communication with the orientation slide groove 212 and is positioned on the same straight line parallel to the axial direction of the guide sleeve 21, and in this case, the orientation slide block 244 corresponds to the through hole 243 in the circumferential direction. Therefore, the locking part 211 and the directional chute 212 can be simultaneously opened on the guide sleeve by only one grooving process in manufacturing, so that the manufacturing process is reduced. At the same time, the locking part 211 is communicated with the directional chute 212, so that the axial dimension of the locking part is indirectly prolonged, and therefore, a redundant space in the axial direction is provided for the clamping of the sliding block. When the separating portion moves, even if the through hole 243 passes over the locking portion 211, the elastic member 25 can drive the sliding block to be locked into the guiding chute 212, or to be partially locked into the guiding chute 212, and then the sliding block is fully locked to the locking portion 211 and is abutted against the stop step 213 under the pushing of the movable contact piece.

As shown in fig. 14 to 17, in a preferred embodiment, the sliding block 245 is provided with a receiving groove 2451 extending in an axial direction of the sliding block 245, and the elastic member 25 is installed in the receiving groove 2451. The elastic member 25 is disposed in the receiving groove 2451 to define compression and ejection directions of the elastic member, thereby ensuring stable release of elastic force.

As shown in fig. 15 to 17, in another embodiment, the piston portion 241 is provided with an axially extending fitting groove 242, and the fitting groove 242 extends from the bottom of the piston portion 241 to the radial tip of the through hole 243. At this time, the through hole 243 is partitioned by the fitting groove 242 into two side holes located at the side wall of the piston portion 241. By providing the fitting groove 242, the fitting of the slider 245 and the elastic member 25 can be facilitated. The specific assembling step may be, for example, first mounting the piston portion 241 from the bottom of the guide sleeve 21 to the initial position; next, the elastic member 25 is connected between the two sliding blocks 245; the elastic member 25 is compressed again and the sliding block 245 is pressed into the bottom of the fitting groove 242 together with the elastic member 25 from the bottom opening of the fitting groove 242; finally, the slider 245 is aligned with the through hole 243, so that the elastic member 25 ejects the slider 245 into the through hole 243 (two side holes).

As shown in fig. 14 to 17, in a preferred embodiment, the separation portion 24 further includes an extension rod 246 connected to a lower portion of the piston portion 241, and the piston portion 241 extends to above the movable contact 5 through the extension rod 246. Specifically, the bottom of the mounting groove 111 is provided with a through hole communicating with the first chamber 112, and the extension rod 246 extends into the first chamber 112 along the through hole of the bottom of the mounting groove 111. When the piston portion 241 moves downward, the movable contact 5 is impacted by the extension rod 246 to separate the movable contact 5 from the stationary contact 4. Thus, by providing the extension rod 246, the distance between the protection switch 2 and the movable contact 5 and the static contact 4 is prolonged, so that the movable contact and the static contact are prevented from being damaged by the explosion of the explosion part. In addition, the piston portion 241 extends to the upper portion of the movable contact 5 through the extension rod 246, and the piston portion 241 cannot invade into the second chamber due to the blocking of the mounting groove 111, so that the protection switch is separated from the movable contact and the static contact, and the piston portion 241 is prevented from invading into the second chamber due to excessive movement, thereby affecting the normal use of the contactor. As described above, as shown in fig. 14, the extension rod 246 and the piston portion 241 may be integrally formed. However, for ease of assembly, the extension rod 246 may be a separate member as shown in fig. 15-17, for example, the extension rod 246 may be threadably coupled to the assembly slot 242 by an upper coupling portion 2461, with the rod section 2462 below the extension rod 246 extending to the second chamber 112.

In still another embodiment, as shown in fig. 17, an extension rod 246 is connected to the fitting groove 242 and extends to the slider 251 to support the slider 251.

As shown in fig. 14 to 17, in a preferred embodiment, a spacer 23 is provided between the explosion portion 22 and the piston portion 241, and the spacer 23 is used to protect the piston portion 241 from high temperature generated by explosion of the explosion portion 22 to damage the piston portion 241. The diaphragm 23 is slidably provided between the explosion portion 22 and the piston portion 241, and moves downward with the piston portion 241 under the impact of the explosion.

In another embodiment of the present invention, a circuit system is provided, including the contactor in any of the above embodiments.

Compared with the locking structure on the existing integrated contactor, the protection switch is provided with the locking structure, so that the locking structure does not need to be independently designed in the contactor, the internal structure of the contactor is simpler, and the design difficulty of the contactor is reduced; in addition, when the locking structure in the prior art is started, the explosion part is required to provide enough impact force to overcome the expansion force of the locking structure, so that the moving plate can be locked, and particularly, the locking hook of the locking structure is required to be extruded to two sides (can be also called to expand to two sides) in the downward moving process of the moving plate, at the moment, enough force is required to be applied to the locking hook to complete extrusion, so that the locking hook is blocked below the locking hook, and therefore, if the impact force is insufficient, the locking cannot be successfully performed. The elastic piece of the self-locking mechanism is in a compressed state at the initial position, so that when the self-locking mechanism is started, locking can be completed only by releasing elastic force to two sides (namely ejecting and clamping the elastic piece to the locking part), and compared with the prior art, the self-locking mechanism has the advantages that the locking can be accurately completed without overcoming the expanding force of the locking structure, and the reliability is higher; in addition, the self-locking mechanism is arranged in the protection switch, so that the driving mechanism of the contactor is not influenced, and the on-off of the contactor under normal conditions is not influenced.

While the foregoing has described in detail the aspects of the present application, specific examples have been presented herein to illustrate the principles and embodiments of the present application, the above examples are provided solely to assist in the understanding of the methods of the present application and their core concepts; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above.

Reference throughout this specification to "one embodiment," "an embodiment," or "a particular embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment, and not necessarily all embodiments, of the present application. Thus, the appearances of the phrases "in one embodiment," "in an embodiment," or "in a specific embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics of any specific embodiment of the present application may be combined in any suitable manner with one or more other embodiments. It is to be understood that other variations and modifications of the embodiments of the application described and illustrated herein are possible in light of the teachings herein and are to be considered as part of the spirit and scope of the present application.

It will also be appreciated that one or more of the elements shown in the figures may also be implemented in a more separated or integrated manner, or even removed because of inoperability in certain circumstances or provided because it may be useful depending on the particular application.

In addition, any labeled arrows in the drawings/figures should be considered only as exemplary, and not limiting, unless otherwise specifically indicated. Furthermore, the term "or" as used herein is generally intended to mean "and/or" unless specified otherwise. Combinations of parts or steps will also be considered as being noted where terminology is foreseen as rendering the ability to separate or combine is unclear.

Claims

1. A contactor, comprising:

A housing, wherein an arc extinguishing chamber is provided in the housing;

Two stationary contact pieces arranged opposite to each other, the stationary contact pieces are arranged in the arc extinguishing cavity, and include a stationary contact section located in the arc extinguishing cavity, a lead-out section extending from one end of the stationary contact section to the outside of the housing, and a stationary arc-initiating section folded outward and upward from the other end of the stationary contact section;

A movable contact piece disposed in the arc extinguishing chamber, the movable contact piece being disposed below the two stationary contacts, comprising a movable arc striking section and movable contact sections extending from both ends of the movable arc striking section, the movable contact section being detachably contacting the stationary contact sections of the two stationary contacts;

An arc extinguishing grid arranged in the arc extinguishing cavity, the arc extinguishing grid being arranged above the arc striking section of the static piece and being used for extinguishing two arcs generated when the moving piece contact section is separated from the static piece contact section;

An arc-striking mechanism is used to form a guiding magnetic field, and the guiding magnetic field is used to apply a Lorentz force to the two arc segments, so that the two arc segments are gradually transferred to the arc extinguishing grid along the moving arc-striking segment and the static arc-striking segment.

2. The contactor according to claim 1, characterized in that:

The arc striking mechanism comprises two magnets arranged opposite to each other, the opposite magnetic poles of the two magnets are opposite to each other, the moving contact piece and the stationary contact piece are located between the two magnets, and the guiding magnetic field is formed between the two magnets for applying an initial Lorentz force inward to the two arcs.

3. The contactor according to claim 2, characterized in that:

The two ends of the two magnetic steels are connected via magnetic conductive frames respectively.

4. The contactor according to claim 3, characterized in that:

A side groove surrounding the arc extinguishing chamber is arranged in the side wall of the shell, and the magnetic steel and the magnetic conductive frame are embedded in the side groove.

5. The contactor according to claim 1, characterized in that:

The static sheet arc-starting section includes a first section, a second section and a third section connected in sequence from the other end of the static sheet contact section, the first section, the second section and the third section are gradually folded along the outer upper direction, and the folding angle between the first section and the second section is greater than the folding angle between the static sheet contact section and the first section and the folding angle between the second section and the third section, wherein

The distance between the two stationary contact pieces is set so that the two arc sections can be connected at the second section.

6. The contactor according to claim 1, characterized in that:

The arc extinguishing grid comprises two mounting plates arranged opposite to each other and a plurality of grid plates connected between the two mounting plates, wherein the plurality of grid plates are arranged at intervals.

7. The contactor according to claim 6, characterized in that:

The plurality of grid plates form two inclined steps at the bottom of the arc extinguishing grid corresponding to the arc-starting sections of the static plates.

8. The contactor according to claim 7, characterized in that:

The inclination angle of the inclined step corresponds to the folding angle of the static sheet arc-starting section.

9. The contactor according to any one of claims 1 to 8, characterized in that:

The housing comprises an upper housing and a lower housing, wherein a first chamber is disposed in the upper housing, and a second chamber is disposed in the lower housing.

The upper shell is connected to the lower shell, so that the first chamber and the second chamber enclose the arc extinguishing chamber.

10. A circuit system, characterized by comprising the contactor according to any one of claims 1 to 9.