Contactor with protection switch and circuit system

Abstract

A contactor with a protection switch and a circuit system, the contactor comprises a protection switch, a static contact piece, a moving contact piece and a driving mechanism used for driving the moving contact piece and the static contact piece to be connected or disconnected, the protection switch comprises a guide sleeve, a driving part and a separation part slidably sleeved in the guide sleeve, the driving part is used for selectively driving the separation part to move from an initial position to a set position so as to separate the separation part from the movable contact piece and the static contact piece, an elastic locking part is arranged on the side wall of the guide sleeve, at least part of the elastic locking part protrudes out of the inner wall of the guide sleeve, and the elastic locking part can be pushed by the separation part to expand outwards; the separating part is provided with a clamping part corresponding to the elastic locking part, and the elastic locking part is used for expanding outwards in the process that the separating part moves from the initial position to the set position and rebounding inwards to the clamping part after the separating part moves to the set position so that the separating part can be limited to the set position. Compared with the prior art, the contactor is more reasonable in design and higher in reliability.

Description

Technical Field

[0001] This utility model belongs to the field of circuit system control, specifically relating to a contactor with a protective switch and a circuit system. The contactor's self-locking protective switch can separate the contactor's moving and stationary contacts when an abnormality occurs in the circuit system, thereby providing overload and short-circuit protection. This contactor is typically used in high-voltage power distribution units (PDUs) and battery disconnect units (BDUs) in energy subsystems. Background Art

[0002] The Battery Disconnect Unit (BDU), designed specifically for use within a battery pack, is a type of high-voltage power distribution unit (PDU). Electrically, the BDU's main components include contactors, fuses, a Battery Management Unit (BMU), pre-charge resistors, current collection elements, copper busbars, connectors, and wiring harness assemblies.

[0003] With the continuous development of new energy vehicle technology, BDU technology is also constantly improving. In the future, BDU will develop in several directions: Higher voltage: With the advancement of battery technology, the voltage of the battery system will continue to increase, and BDU will also need to support higher voltage; Higher power: In order to improve the performance of new energy vehicles, BDU needs to support higher power; More intelligent: BDU will be more intelligent and can better cooperate with other components such as the battery management system (BMS) to improve the overall efficiency and safety of the battery system.

[0004] With the development of BDUs, the integration of components, especially the physical or functional integration of components with similar functions, has become a beneficial exploration. For example, Chinese utility model patent CN202210250275.5 discloses a fuse-integrated contactor. In the event of an emergency disconnection of the battery circuit, the explosive fuse assembly is activated to separate the moving and static plates of the contactor. At the same time, a locking hook provided on the yoke iron plate hooks the moving plate to prevent the moving and static contacts from contacting again.

[0005] However, since the locking structure in the above-mentioned prior art is arranged on the yoke iron plate, that is, below the movable plate, it is necessary to design a separate locking structure inside the contactor, which increases the design difficulty of the contactor; in addition, when the contactor is disconnected under normal circumstances, the movable plate will be separated under the action of the release spring between the movable iron core and the static iron core. At this time, due to the elastic force of the release spring, the movable plate may be pressed into the lock hook, so that when it needs to be closed next time, the movable plate is locked by the locking structure and cannot be closed normally, affecting the normal on and off of the contactor. Utility Model Content

[0006] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a contactor and circuit system with a protective switch, so as to solve the problems in the prior art that the integrated contactor is difficult to design and the locking structure is unreasonable, which affects the use of the contactor under normal circumstances.

[0007] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0008] The protection switch includes a guide sleeve, a driving part and a separation part slidably mounted in the guide sleeve, wherein the driving part is used to selectively drive the separation part to move from an initial position to a set position so that the separation part separates the movable contact piece and the static contact piece, wherein:

[0009] An elastic locking portion is provided on the side wall of the guide sleeve, and the elastic locking portion at least partially protrudes from the inner wall of the guide sleeve and can expand outward under the push of the separation portion.

[0010] The separation portion is provided with a locking portion corresponding to the elastic locking portion,

[0011] The elastic locking portion is used to expand outwards when the separating portion moves from the initial position to the set position and rebound inwards to the locking portion after the separating portion moves to the set position, so as to limit the separating portion to the set position.

[0012] As an embodiment of the present invention, the guide sleeve side wall is provided with an opening, and the elastic locking portion includes: an elastic wall expandably arranged in the opening, one end of the elastic wall is connected to the guide sleeve side wall, and the other end is provided with a sliding end face and a limiting end face extending into the guide sleeve, the sliding end face is inclined inward and downward, and the limiting end face is arranged below the sliding end face, and the separation portion can slide along the sliding surface to push the elastic wall to expand outward from the opening; after the separation portion moves to the set position, the elastic wall rebounds inward to the opening, and causes the sliding end face and the limiting end face to be clamped into the locking portion, so that the separation portion is stopped against the limiting end face.

[0013] As an embodiment of the present invention, the contactor further comprises a housing, a mounting groove is provided on the top of the housing, the guide sleeve is installed in the mounting groove, and the inner wall of the mounting groove is provided with a matching groove for matching the expansion of the elastic wall.

[0014] As an embodiment of the present invention, the circumferential length of the matching groove is greater than that of the opening, and support ribs are provided on both circumferential sides of the opening and are embedded in the matching groove.

[0015] As an embodiment of the present utility model, the elastic locking portion includes a locking hook piece inclined inward and downward from the inner wall of the guide sleeve. When the separation portion moves from the initial position to the set position, the separation portion expands the locking hook piece outward; when the separation portion moves to the set position, the locking hook piece rebounds inward to the locking portion, so that the separation portion stops at the locking hook piece.

[0016] As an embodiment of the present invention, a gap structure is provided between the separation portion and the guide sleeve, and the gap structure is used to accommodate the locking hook piece when the separation portion pushes the locking hook piece to expand outward.

[0017] As an implementation manner of the present invention, the number of the elastic locking parts is two or more.

[0018] As an embodiment of the present invention, the driving part includes a triggering part and an explosion part arranged between the separation part and the triggering part. The triggering part is used to receive an external signal and trigger the explosion part to explode according to the signal, thereby driving the separation part to move.

[0019] As an embodiment of the present invention, a guide sleeve is provided between the explosion part and the separation part.

[0020] As an embodiment of the present invention, an extension rod is provided at the bottom of the separation portion, and the separation portion can separate the movable contact piece and the static contact piece through the extension rod.

[0021] In order to achieve the above purpose, the present invention also adopts the following technical solutions:

[0022] A circuit system includes the contactor mentioned above.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] 1. Compared to the locking structure on existing integrated contactors, the present invention has a built-in locking structure for the protection switch (the elastic locking portion locks the separation portion), eliminating the need for a separate locking structure inside the contactor. This avoids complicating the internal structure of the contactor and reduces the difficulty of contactor design.

[0025] 2. Since the locking structure of the present invention is arranged in the protection switch, it will not affect the driving mechanism of the contactor and will not affect the on-off function of the contactor under normal circumstances. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 This is a schematic diagram of the three-dimensional structure of a contactor according to a specific embodiment of the present utility model;

[0028] Figure 2 This is an exploded view of a contactor according to a specific embodiment of the present invention;

[0029] Figure 3 It is a cross-sectional view of the contactor when the electromagnetic coil is de-energized;

[0030] Figure 4 This is a cross-sectional view of the contactor when the electromagnetic coil is energized and the protection switch is not activated;

[0031] Figure 5 This is a cross-sectional view of the contactor when the protection switch is activated;

[0032] Figure 6 This is a cross-sectional perspective view of a contactor according to a specific embodiment of the present invention;

[0033] Figure 7 It is a cross-sectional perspective view of a contactor according to a specific embodiment of the present invention from another direction;

[0034] Figure 8 This is a bottom view of the lower housing of a contactor according to a specific embodiment of the present invention;

[0035] Figure 9 yes Figure 4 The lower enlarged view of

[0036] Figure 10 yes Figure 9 A magnified view of part A in FIG;

[0037] Figure 11 The figure shows the magnetic field conduction direction diagram of the driving mechanism of a specific embodiment of the present utility model;

[0038] Figure 12 This is a structural diagram of the connection between the movable contact piece and the clamping mechanism of the contactor, as well as the clamping mechanism and the driving mechanism in a specific embodiment of the present utility model;

[0039] Figure 13 This is a cross-sectional view of a clamping mechanism of a contactor according to a specific embodiment of the present utility model clamping a movable contact piece;

[0040] Figure 14This is a top cross-sectional view of the contactor in Example 1 of the present utility model (when the protection switch is not activated and the piston portion is in the initial position);

[0041] Figure 15 This is a top cross-sectional view of the contactor in Example 1 of the present utility model (when the protection switch is activated and the piston portion is in the set position);

[0042] Figure 16 This is a perspective view of the protection switch in Example 1 of the present utility model;

[0043] Figure 17 is a perspective view of the upper housing of the contactor;

[0044] Figure 18 1 is a top cross-sectional view of the contactor of Example 2 of the present utility model (when the protection switch is not activated and the piston portion is in the initial position);

[0045] Figure 19 This is a top cross-sectional view of the contactor of Example 2 of the present utility model (when the protection switch is activated and the piston portion is in the set position);

[0046] Figure 20 yes Figure 5 Enlarged view of the middle part;

[0047] Figure 21 It is a cross-sectional view of the middle portion of a contactor in another direction according to a specific embodiment of the utility model;

[0048] Figure 22 This is a cross-sectional view of an arc extinguishing system of a contactor according to a specific embodiment of the present invention;

[0049] Figure 23 This is a structural perspective diagram of a contactor of a specific embodiment of the present invention with the housing removed;

[0050] Figure 24 This is a working principle diagram of an arc extinguishing system according to a specific embodiment of the present utility model;

[0051] Figure 25 shows a magnetic field diagram of the arc striking mechanism from a side view;

[0052] Figure 26 The magnetic field diagram of the arc striking mechanism is shown from a top view.

[0053] Description of reference numerals:

[0054] 1. Housing, 11. Upper housing, 111. Mounting groove, 112. First chamber, 113. Positioning column, 114. Heat dissipation structure, 115. Matching groove, 116. Flange groove, 12. Lower housing, 121. Second chamber, 122. Third chamber, 123. Side groove, 13. Bottom cover, 14. Connector;

[0055] 2. Protective switch, 21. Guide sleeve, 211. Elastic locking portion, 2111. Elastic wall, 2112. Sliding end surface, 2113. Limiting end surface, 212. Opening, 213. Support rib, 214. L-shaped flange, 22. Driving portion, 221. Triggering portion, 222. Explosion portion, 23. Guide sleeve, 24. Separation portion, 241. Locking portion, 25. Outer sleeve, 251. Outer flange, 26. Fixing plate, 27. Bolt, 28. Extension rod;

[0056] 3. Driving mechanism, 31. Magnetic pole piece, 32. Yoke, 33. Electromagnetic coil, 331. Lead-out electrode piece, 34. Magnetic sleeve, 35. Sliding sleeve, 36. Moving iron core, 361. Moving core inner groove, 362. Threaded hole, 37. Stationary iron core, 371. Stationary core inner groove, 38. Driving rod, 381. Screw portion, 39. Return spring;

[0057] 4. Static contact piece, 41. First contact point; 42. Lead-out section, 43. Static piece contact section, 44. Static piece arc-starting section, 441. First section, 442. Second section, 443. Third section, 45. Positioning hole;

[0058] 5. Moving contact piece, 51. Second contact point, 52. Moving piece contact section, 53. Moving piece arc striking section;

[0059] 6. Clamping mechanism, 61. Support block, 62. Clamping frame, 621. Clamping piece, 622. Extended support leg, 63. Connecting piece, 64. Support spring;

[0060] 7. Arc chute, 71. Mounting plate, 72. Grid, 73. Inclined ladder;

[0061] 8. Arc striking mechanism, 81. Magnetic steel, 82. Magnetic guide frame, 821. Fitting end, 822. Bending portion. DETAILED DESCRIPTION

[0062] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not used to limit the present invention.

[0063] In the present invention, unless otherwise specified, directional words such as "up", "down", "left", "right", "front" and "back" generally refer to the up, down, left and right of the device in actual use or working state, specifically the drawing direction in the accompanying drawings.

[0064] It should be noted that the order of description of the following embodiments does not limit the preferred order of the embodiments of the present application. In addition, in the following embodiments, the description of each embodiment has its own focus. For parts not described in detail in one embodiment, please refer to the relevant description of other embodiments.

[0065] A traditional contactor (taking an electromagnetic contactor as an example) consists of a coil, a stationary iron core, a moving iron core, a push rod, a return spring, a moving contact piece, and a stationary contact piece. Its operating principle is as follows: When the coil is energized, the coil current generates a magnetic field. This magnetic field causes the stationary iron core to generate an electromagnetic attraction, drawing the moving iron core toward the stationary iron core. This causes the push rod connected to the moving iron core to push the moving contact piece into contact with the stationary contact piece, thereby closing the circuit. When the coil is de-energized, the magnetic field disappears (the electromagnetic attraction disappears), and the moving iron core, under the action of the return spring, moves away from the stationary iron core. This causes the push rod connected to the moving iron core to drive the moving contact piece away from the stationary contact piece, thereby opening the circuit.

[0066] Traditional contactors require integration with a protective switch (such as an explosion switch) to protect the circuit. However, these traditional contactors and protective switches are typically separate devices, making them difficult to align during installation and requiring separate installation, which can be time-consuming. To address these issues, the prior art discloses an integrated contactor that integrates a protective switch with a traditional contactor. By installing an explosion switch on top of the contactor, when an abnormality occurs in the circuit, the explosion switch is activated, causing the separator on the explosion switch to strike the moving contact downward, thereby physically separating the moving contact from the stationary contact. However, the structural design of the prior art integrated contactor has numerous irrationalities.

[0067] Based on this, the present invention discloses a contactor with a protection switch on the basis of the existing integrated contactor. The contactor of the present invention is described in detail below.

[0068] like Figures 1 to 26As shown, a specific embodiment of the present invention provides a contactor with a protective switch, which includes a housing 1; and a driving mechanism 3, a clamping mechanism 6, a moving contact piece 5, a static contact piece 4, an arc extinguishing grid 7 and a self-locking protective switch 2 arranged in the housing 1 from bottom to top. Among them, there are two static contacts 4 and they are arranged in the housing 1 at intervals from each other. The static contacts 4 are used to connect to an external circuit system; the driving mechanism 3 is used to drive the moving contact 5 to contact or separate from the static contact 4 to connect or disconnect the two static contacts 4; the clamping mechanism 6 is used to connect the moving contact 5 and the driving mechanism 3; the protection switch 2 is connected to an external signal transmission device, and is used to strike the moving contact 5 to separate the moving contact 5 and the static contact 4 after receiving the signal transmitted by the signal transmission device. After striking the moving contact 5, the protection switch 2 self-locks to stop the moving contact 5 and thus restrict the moving contact 5 from connecting to the static contact 4 again; the arc extinguishing grid 7 is used to extinguish the arc generated when the moving contact 5 is separated from the static contact 4; in addition, the contactor also includes an arc striking mechanism 8 for guiding the arc to the arc extinguishing grid 7.

[0069] like Figures 1 to 9 As shown, in a specific embodiment, the shell 1 includes an upper shell 11, a lower shell 12 and a bottom cover 13, the upper shell 11 is connected to the lower shell 12 through a connecting member 14, and the bottom cover 13 is snapped into the bottom opening of the lower shell 12. The connecting member 14 can be, for example, a bolt or a rivet. The upper shell 11 is provided with a mounting groove 111 located at the upper part and a first chamber 112 located at the lower part, and the lower shell 12 is provided with a second chamber 121 located at the upper part and a third chamber 122 located at the lower part, wherein the first chamber 112 is communicated with the second chamber 121. Thus, the shell is set to a split structure including an upper shell, a lower shell and a bottom cover, which can facilitate the assembly of the contactor. Here, the shell may also not adopt the above-mentioned split structure, and the shell may also be an integrated structure or other types of split structures, and the present invention is not limited to this. In addition, as Figure 1 and Figure 2 As shown, the outer wall of the upper shell 1 is further provided with a heat dissipation structure 114. The heat dissipation structure 114 can be, for example, a plurality of heat dissipation bars spaced apart from each other. The heat dissipation structure 114 is used to reduce the high temperature generated when the contactor extinguishes the arc.

[0070] Continue to refer to 1 to Figure 9 In one embodiment, the protection switch 2 is mounted in the mounting groove 111, the arc chute 7 and two stationary contacts 4 are mounted in the first chamber 112, the movable contact 5 and the clamping mechanism 6 are mounted in the second chamber 121, and the drive mechanism 3 is mounted in the third chamber 122. The second chamber 121 has a certain depth to ensure that the movable contact 5 can move up and down within the second chamber 121.

[0071] The following describes the drive mechanism 3 of the present invention. In this embodiment, the drive mechanism 3 is an electromagnetic drive mechanism. It should be noted that the drive mechanism 3 can also be another type of drive mechanism, such as a pneumatic drive mechanism or a hydraulic drive mechanism, as long as it can achieve the function of driving the movable contact piece. The following only describes the electromagnetic drive mechanism used in one embodiment of the present invention, and the present invention is not limited to this type of drive mechanism.

[0072] like Figures 2 to 12 As shown, in one specific embodiment, the drive mechanism 3 includes a magnetic pole piece 31, a U-shaped yoke 32, an electromagnetic coil 33, a magnetic conductive sleeve 34, a sliding sleeve 35, a movable iron core 36, a stationary iron core 37, a drive rod 38, and a return spring 39. The yoke 32 includes a base plate and two side plates extending vertically upward from both ends of the base plate. The magnetic pole piece 31 is connected to the upper ends of the two side plates of the yoke 32, so that the yoke 32 and the magnetic pole piece 31 enclose a rectangular mounting frame. Furthermore, the base plate of the yoke 32 is provided with a center hole, and the bottom of the magnetic conductive sleeve 34 is nested in the center hole of the base plate, with the top of the magnetic conductive sleeve 34 spaced a certain distance from the magnetic pole piece 31. The electromagnetic coil 33 comprises a coil bobbin, a coil wound around it (not shown), and an extension electrode 331 mounted on the coil bobbin and connected to the coil. The extension electrode 331 extends outside the housing 1, connecting the coil to an external power supply via the extension electrode 331. The coil bobbin is connected between the yoke 32 and the pole piece 31 and is sleeved onto the magnetic sleeve 34. Specifically, the coil bobbin comprises a small-diameter section and a large-diameter section, perpendicularly connected between the yoke 32 and the pole piece 31, as well as flanges at each end. The large-diameter section sleeves onto the magnetic sleeve 34, while the small-diameter section has the same inner diameter as the magnetic sleeve 34. The small-diameter section and the magnetic sleeve 34 communicate with each other, forming an inner cavity for mounting a sliding sleeve 35. The top flange of the sliding sleeve 35 is connected to the bottom surface of the pole piece 31, and the cylindrical portion of the sliding sleeve 35 is mounted within the coil bobbin (small-diameter section) and the magnetic sleeve 34. The moving iron core 36 and the static iron core 37 are arranged in the sliding sleeve 35; a flange is provided above the static iron core 37, and the static iron core 37 is fixedly connected to the center hole of the magnetic pole piece 31 through the flange, and the moving iron core 36 is slidably arranged below the static iron core 37; the lower end of the driving rod 38 is connected to the moving iron core 36, and the upper end passes through the through hole in the center of the static iron core 37 and is connected to the moving contact piece 5; a reset spring 39 is provided between the moving iron core 36 and the static iron core 37, and the reset spring 39 is sleeved on the driving rod 38. Among them, the magnetic pole piece 31, the yoke 32, the magnetic sleeve 34, the moving iron core 36 and the static iron core 37 are collectively referred to as magnetic conductive parts. When the electromagnetic coil 33 is energized, a magnetic field is formed in these magnetic conductive parts. Figure 11As shown, the conduction direction of the magnetic field is the direction indicated by the dotted arrow. When the electromagnetic coil 33 is energized, a magnetic flux is generated, and a magnetic field is established in the surrounding magnetic conductive parts, which is conducted along the path of the dotted arrow. In the position of the dotted rectangular frame, because there is a gap between the static iron core 37 and the movable iron core 36, the two ends of the gap (the lower end of the static iron core 37 and the upper end of the movable iron core 36) generate different polarities of the N pole and the S pole. The different magnetic poles generate magnetic attraction, causing the movable iron core to move upward until it is connected with the static iron core (that is, the gap is closed).

[0073] The working principle of the driving mechanism is as follows: when the electromagnetic coil 33 is energized, the coil current generates a magnetic field (i.e., a magnetic field is formed in the magnetic conductive member along the dotted arrow), and the generated magnetic field causes the static iron core 37 to attract the movable iron core 36 to slide upward, causing the driving rod 38 connected to the movable iron core 36 to drive the movable contact piece 5 to move toward the static contact piece 4, and the movable contact piece 5 contacts and connects with the static contact piece 4, thereby closing the circuit (i.e., the contactor is switched off). Figure 3 The status switches to Figure 4 When the coil is de-energized, the magnetic field disappears, and the reset spring 39 drives the movable iron core 36 to slide downward, causing the drive rod 38 connected to the movable iron core 36 to drive the movable contact piece 5 to move away from the static contact piece 4, and the movable contact piece 5 is disconnected from the static contact piece 4, thereby disconnecting the circuit (i.e., the contactor is disconnected from the movable iron core 36). Figure 4 The status switches to Figure 3 status).

[0074] like Figure 9 and Figure 10 As shown, in one specific embodiment, the movable core 36 is provided with a movable core inner groove 361, and the stationary core 37 is provided with a stationary core inner groove 371. One end of the return spring 39 is connected to the movable core inner groove 361, and the other end is connected to the stationary core inner groove 371. Furthermore, the movable core 36 is provided with a threaded hole 362 located below the movable core inner groove 361. The lower end of the drive rod 38 is provided with a screw portion 381, which is threadedly connected to the threaded hole 362. Thus, the drive rod 38 is adjustably connected to the movable core 36 via the screw portion 381, allowing the initial spacing between the movable contact piece 5 and the stationary contact piece 4 to be adaptively adjusted during contactor assembly to meet the assembly accuracy of the contactor.

[0075] like Figures 9 to 13As shown, in one embodiment, the upper end of the driving rod 38 is connected to the movable contact piece 5 via a clamping mechanism 6. Specifically, the clamping mechanism 6 includes a support block 61, in which the upper end of the driving rod 38 is embedded; a clamping frame 62 mounted above the support block 61, the clamping frame 62 including a clamping piece 621, extension legs 622 extending downward from the edges (four corners) of the clamping piece 621, the distal ends of the extension legs 622 being embedded in the support block 61; a connecting piece 63 disposed below the clamping piece 621; and a support spring 64 disposed between the connecting piece 63 and the support frame 62. The middle section of the moving contact piece 5 (the moving arc-starting section 53 described later) is clamped between the clamping piece 621 and the connecting piece 63. The support spring 64 provides supporting force for the connecting piece 63 so that the connecting piece 63 and the clamping piece 621 can stably clamp the moving contact piece 5. At the same time, the support spring 64 can play a buffering role when the protective switch 2 separates the moving contact piece 5 and the static contact piece 4.

[0076] Furthermore, the clamping mechanism 6 can be replaced with any other type of clamping mechanism in the prior art, as long as it can achieve the function of connecting the movable contact piece 5 and the drive rod 38. The above is only one embodiment of the present invention. Of course, the clamping mechanism 6 can also be omitted, and the movable contact piece 5 and the drive rod 38 can be directly connected, as long as the drive rod 38 can drive the movable contact piece 5 to connect or disconnect the stationary contact piece 4. The present invention is not limited to this.

[0077] like Figures 2 to 9 as well as Figures 20 to 26 As shown, in one specific embodiment, the static contact piece 4 includes a lead-out section 42, a static contact section 43, and a static arc-starting section 44, which are connected in sequence. The static contact section 43 and the static arc-starting section 44 are disposed within the first chamber 112. The lead-out section 42 extends from one end of the static contact section 43 (i.e., the end away from the interior of the housing) and is configured to connect to the circuit system. The static arc-starting section 44 folds outward and upward from the other end of the static contact section 43 (i.e., the end closer to the interior of the housing), tilting toward the side wall of the housing. The two static contacts 4 are positioned opposite each other and spaced apart along the central axis of the contactor, forming a V-shaped structure with an open lower end.

[0078] Furthermore, positioning grooves are provided on both sides of the upper opening of the lower shell 12, and the static contact piece 4 is positioned within these positioning grooves. Positioning posts 113 are provided on both sides of the lower opening of the upper shell 11. Positioning holes 45 corresponding to the positioning posts 113 are provided between the lead-out section 42 and the static contact section 43 of the static contact piece 4. When the upper shell 11 is installed on the lower shell 12, the positioning posts 113 engage with the positioning holes 45. Thus, the static contact piece 4 is secured to the shell 1 via the positioning grooves and positioning posts. Of course, the static contact piece 4 can also be secured to the shell 1 using other mounting methods, such as bonding, bolting, and riveting, but the present invention is not limited thereto. Using the aforementioned positioning groove and positioning post connection method reduces the number of installation steps; simply fastening the upper and lower shells together simultaneously defines the position of the static contact piece.

[0079] like Figures 2 to 9 as well as Figures 20 to 26 As shown, in one specific embodiment, the movable contact piece 5 is disposed below the two stationary contacts 4 and includes movable contact segments 52 at both ends and a movable arc-starting segment 53 connected between the two movable contact segments 52. A first contact point 41 is provided at the bottom of the stationary contact segment 43 of the stationary contact piece 4, and a second contact point 51 corresponding to the first contact point 41 is provided at the top of the movable contact segment 52 of the movable contact piece 5. The second contact point 51 on the movable contact segment 52 and the first contact point 41 on the stationary contact segment 43 enable the movable contact piece 5 to detachably contact the stationary contacts 4. Specifically, when the movable contact piece 5 moves upward, the second contact point 51 on the movable contact segment 52 contacts the first contact point 41 on the stationary contact segment 43, thereby connecting the movable contact piece 5 to the two stationary contacts 4 and completing the circuit. When the movable contact piece 5 moves downward, the second contact point 51 separates from the first contact 41, thereby disconnecting the two stationary contacts 4 and breaking the circuit. Among them, the static piece arc-starting section 44 and the moving piece arc-starting section 53 are used to cooperate with the arc-starting mechanism 8 to guide the arc generated when the moving piece contact section 52 is separated from the static piece contact section 43 to the arc extinguishing grid 7. After the arc enters the arc extinguishing grid 7, it is cooled and extinguished.

[0080] Hereinafter, how the contactor of the present invention realizes arc extinguishing will be described in detail.

[0081] As mentioned above, the static contact segments 43 of the two static contacts 4 are in detachable contact with the movable contact segments 52 at both ends of the movable contact 5. Therefore, when the movable contact 5 is separated from the static contact 4, two arcs will be generated (i.e., an arc will be generated between the static contact segment 43 of the static contact on one side and the movable contact segment 52 at one end, and an arc will be generated between the static contact segment 43 of the static contact on the other side and the movable contact segment 52 at the other end), and the current directions of the two arcs are opposite. Specifically, Figure 24 (the red arrow in the figure represents the direction of current) as an example, since the moving contact piece 5 is located below the two static contact pieces 4, the direction of the current is certain, that is, from Figure 24The current in the left static contact flows along the moving contact to the right static contact. Therefore, when the current flows from the left static contact to the moving contact, the current direction will turn downward. When the current flows from the moving contact to the right static contact, the current in the moving contact will turn upward. Therefore, when the moving contact 5 separates from the static contact 4, the current direction of the arc generated on the left is downward, and the current direction of the arc generated on the right is upward.

[0082] To this end, the present invention realizes arc extinguishing of the above-mentioned two arcs with different directions through the following arc extinguishing system.

[0083] In a specific embodiment, if Figures 2 to 9 as well as Figures 20 to 26 As shown, the arc extinguishing system primarily comprises the first chamber 112 and the second chamber 121 of the housing 1; an arc chute 7 and two stationary contacts 4 disposed within the first chamber 112, the arc chute 7 being positioned above the stationary arc-strike segments 44 of the stationary contacts 4; a movable contact 5 disposed within the second chamber 121; and an arc-strike mechanism 8. The two stationary contacts 4 and the movable contact 5 generate an arc when separated; the first chamber 112 and the second chamber 121 serve as arc-strike chambers of the arc extinguishing system; the stationary arc-strike segments 44 of the stationary contacts 4, the movable arc-strike segments 53 of the movable contact 5, and the arc-strike mechanism 8 are used to guide the arc deflection so that it moves to the arc chute 7; and the arc chute 7 is used to cool and extinguish the arc.

[0084] Furthermore, the arc striking mechanism 8 is used to form a guiding magnetic field, which 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 7 along the moving arc striking section 53 and the static arc striking section 44. Specifically, the direction of the magnetic flux lines of the guiding magnetic field is orthogonal to the current direction of the arc, and can apply an initial inward Lorentz force to the two arc segments. Figures 24 to 26 For example, in the figure, the red arrow represents the direction of current, the blue arrow represents the direction of magnetic flux lines, and the yellow arc represents the deflection trajectory of the arc. The current direction is from left to right, and the guide mechanism 8 is configured so that the magnetic flux lines of the guide magnetic field it forms are oriented from front to back. At this point, according to the left-hand rule, the left arc is subject to an initial Lorentz force directed to the right, while the right arc is subject to an initial Lorentz force directed to the left. In other words, both arcs are subject to an initial Lorentz force directed inward. Then, under the action of the Lorentz force, both arcs begin to deflect inward along the moving arc-starting section 53 (i.e., the left arc deflects in the counterclockwise direction and the right arc deflects in the clockwise direction), causing the current direction to tilt inward. Since the direction of the magnetic flux lines remains unchanged, the direction of the Lorentz force acting on the arc is always perpendicular to the current direction. Therefore, under the action of the Lorentz force, the arc is transferred to the arc-extinguishing grid 7 along the moving arc-starting section 53 and the static arc-starting section 44 in turn. That is, the arc can be continuously deflected to the arc-extinguishing grid 7 under the action of the guiding magnetic field until it is extinguished in the arc-extinguishing grid 7.

[0085] The movement path of the arc can be roughly divided into three stages. In the first stage, the movable contact piece 5 is separated from the static contact piece 4, and an arc is formed between the movable contact segment 52 and the static contact segment 43. The arc is deflected inward and upward along the movable arc striking segment 53 under the action of the guiding magnetic field formed by the guiding mechanism 8 (that is, the left arc is deflected in the counterclockwise direction, and the right arc is deflected in the clockwise direction). In this stage, the other end of the two arcs (the end connected to the movable arc striking segment 53 of the movable contact piece) will gradually approach each other along the movable arc striking segment 53; in the second stage, one end of the two arcs (that is, , the end connected to the static contact piece) is deflected to the connection between the static piece contact section 43 and the static piece arc-starting section 44 (that is, the folded corner), and after the other ends of the two arcs (that is, the end connected to the moving piece arc-starting section 53 of the moving contact piece) approach and contact, they will instantly stretch upward to form an arc as a whole connected between the two static contact pieces (that is, between the connection between the static piece contact section 43 and the static piece arc-starting section 44); the third stage: under the action of the guiding magnetic field, the arc as a whole is stretched to both sides along the static piece arc-starting section 44 and moves upward into the arc extinguishing grid 7, and at the same time is cooled and extinguished in the arc extinguishing grid 7.

[0086] The utility model utilizes an arc striking mechanism, a moving plate arc striking section, and a stationary plate arc striking section to simultaneously connect the two arcs in different directions into a single whole and guide them to the arc extinguishing grid located above the stationary plate arc striking section for arc extinguishing. Thus, arc extinguishing can be achieved with only one arc extinguishing system, simplifying the arc extinguishing system of the contactor.

[0087] In a specific embodiment, the arc striking mechanism 8 includes two magnets 81 arranged opposite to each other, and the moving contact piece 5 and the static contact piece 4 are located between the two magnets 81. The opposite magnetic poles of the two magnets 81 are arranged opposite to each other. Figures 24 to 26 For example, when the current flows from left to right, the north pole of the magnet 81 near the front faces the south pole of the magnet 81 near the rear. Conversely, when the current flows from right to left, the south pole of the magnet 81 near the front faces the north pole of the magnet 81 near the rear. This allows the guiding magnetic field formed between the two magnets to exert an initial inward Lorentz force on the two arcs (because the magnetic flux lines between the two magnets are uniformly distributed straight lines, the left-hand rule indicates that the two arcs can be subjected to an initial inward Lorentz force).

[0088] In one embodiment, the two ends of the two magnets 81 are connected by a U-shaped magnetic guide frame 82, thereby enclosing the movable contact piece 5 and the stationary contact piece 4 within a square frame formed by the magnets 81 and the magnetic guide frame 82. By providing the magnetic guide frame, the guide magnetic field of the magnets 81 is distributed along the magnetic guide frame 82, which can enhance the magnetic field strength of the guide magnetic field, thereby increasing the arc deflection capability of the magnetic field and improving arc extinguishing efficiency.

[0089] Further, if Figures 6 to 8 as well as Figure 20 and Figure 21As shown, the side wall of the second chamber 121 of the lower shell 12 is also provided with a side groove 123, which extends along the axial direction of the shell 1 and is arranged around the first chamber 112 and the second chamber 121. The magnetic steel 81 and the magnetic frame 82 of the arc striking mechanism 8 are accommodated in the side groove 123. Preferably, the side groove 123 is rectangular and has chamfers. The two corners of the U-shaped frame are respectively provided with chamfers corresponding to the chamfers of the side groove 123. The structural strength of the contactor is improved by setting the chamfers. Of course, the magnetic steel 81 and the magnetic frame 82 can also be arranged in the arc extinguishing chamber, or outside the shell, or even not on the contactor. As long as a guiding magnetic field can be provided for the arc, the utility model does not limit the position of the arc striking mechanism. It is arranged in the side groove only for the convenience of assembly.

[0090] Preferably, if Figures 6 to 8 as well as Figures 20 to 26 As shown, the height dimension of the magnet 81 extends from the top of the guide end 44 to the bottom of the moving contact piece, and the magnetic frame 82 includes a fitting end portion 821 that is fitted and connected to the magnet 81 and a bending portion 822 that connects the fitting end portion 821. The fitting end portion 821 has the same height as the magnet 81 and a width that is half of the magnet 81, so that the four fitting ends 821 are completely fitted and connected to the surface of the magnet 81. The height dimension of the bending portion 822 extends from the bottom of the static contact piece to a position lower than the bottom of the magnet. Correspondingly, the side groove 123 is configured so that the depth of the portion that accommodates the magnet is greater than the depth of the portion that accommodates the bending portion 822. The above only shows one embodiment of the combination of the magnet and the magnetic frame of the present invention. However, the present invention is not limited to this, and the structure of the magnet and the magnetic frame can also be of other types.

[0091] In another specific embodiment, the arc striking mechanism 8 includes a U-shaped magnet (not shown), with the movable contact 5 and the stationary contact 4 positioned within the concave cavity of the U-shaped magnet. When the current flows from left to right, the U-shaped magnet's north pole is positioned at the front, and its south pole is positioned at the rear. Conversely, when the current flows from right to left, the U-shaped magnet's south pole is positioned at the front, and its north pole is positioned at the rear. This allows the guiding magnetic field formed within the concave cavity of the U-shaped magnet to exert an initial inward Lorentz force on the two arc segments (since the magnetic flux lines within the concave cavity of the U-shaped magnet are uniformly distributed straight lines, the left-hand rule indicates that the two arc segments are subject to an initial inward Lorentz force).

[0092] In a specific embodiment, if Figures 20 to 23As shown, the arc chute 7 is positioned above the static arc-strike section 44 of the stationary contact 4. The arc chute 7 comprises two opposing mounting plates 71 and a plurality of spaced-apart grid plates 72 perpendicularly connected between the two mounting plates 71. Furthermore, to facilitate the static arc-strike section 44 and ensure smooth entry of the elongated arc into the arc chute 7, the grid plates 72 are arranged in a stepped pattern from the center toward the sides (i.e., the lengths of the grid plates 72 gradually decrease from the center toward the sides). This arrangement forms two inclined steps 73 at the bottom of the arc chute 7, corresponding to the static arc-strike section 44. The gap between the two middle grid plates 72 is larger than the diameter of the extension rod 28, described later. This allows the extension rod 28 to pass through the gap and extend to the moving contact 5.

[0093] Preferably, the folding angle of the static arc-starting segment 44 of the static contact piece 4 corresponds to (is the same as or substantially the same as) the inclination angle of the inclined step 73. Here, the folding angle of the static arc-starting segment 44 can be understood as the angle between the static arc-starting segment 44 and the static contact segment 43, and the inclination angle of the inclined step 73 can be understood as the angle between the inclined step 73 and the static contact segment 43. The spacing between each part of the static arc-starting segment 44 and the inclined step 73 is substantially the same to ensure that the arc can be smoothly extended and enter the arc chute.

[0094] In one specific embodiment, the inclined step 73 is composed of a plurality of grid pieces 72 whose length gradually decreases from the center to the sides. Alternatively, the inclined step 73 is composed of a plurality of grid pieces 72 arranged in other arrangements, such as one long and one short, two long and one short, from the center to the sides. As long as the bottom of the arc chute forms an inclined step opposite the arc-starting section of the static piece so that the arc can extend along the arc-starting section of the static piece and enter the arc chute, the length of the plurality of grid pieces 72 can be specifically set according to the arc extinguishing requirements of different products. The present invention is not limited to this.

[0095] In a specific embodiment, if Figures 20 to 24As shown, the static plate arc-starting section 44 includes a first section 441, a second section 442, and a third section 443, which are sequentially connected from the other end of the static plate contact section 43. The first section 441 folds upward from the other end of the static plate contact section 43, the second section 442 folds outward from the first section 441, and the third section 443 folds further outward from the second section 442. The folding angle between the first section 441 and the second section 442 is greater 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 plate arc-starting section 44. Furthermore, the spacing between the two static contact pieces 4 is set so that the two arc sections can connect when deflected to the second section 442, and the connection between the second section 442 and the third section 443 is aligned with the lowest surface of the arc extinguishing grid 7. Therefore, by setting the static plate arc-starting section 44 to the above-mentioned gradually folded three-section type and the folding angle between the first section 441 and the second section 442 is greater 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 plate arc-starting section 44, the deflection process of the arc can be smoother and more stable.

[0096] Hereinafter, the protection switch 2 of the present invention will be described in detail with reference to different embodiments.

[0097] like Figures 1 to 7 and Figures 14 to 19 As shown, in a specific embodiment, the protection switch 2 is arranged at the top of the housing 1 (i.e., in the mounting groove 111), and includes: a guide sleeve 21, a driving portion 22 and a separating portion 24 slidably mounted in the guide sleeve 21, the driving portion 22 is used to selectively drive the separating portion 24 to move from the initial position to the set position so that the separating portion 24 separates the moving contact piece 5 and the static contact piece 4. For example, the driving portion 22 is not started when the circuit is normal, and when there is an abnormality in the circuit system or a collision of the vehicle and the circuit needs to be disconnected as soon as possible, the driving portion 22 drives the separating portion 24 to separate the moving contact piece 5 and the static contact piece 4. Here, moving to the set position means that the separating portion moves to a position where it can hit the moving contact piece and disconnect the connection between the moving contact piece and the static contact piece (i.e., the separating portion automatically starts to move from the initial position to the set position). Figure 4 Move to the position in Figure 5 The separating portion 24 may be a piston disposed in the guide sleeve 21.

[0098] Continue to refer to Figures 1 to 7 and Figures 14 to 19 In one embodiment, the driving portion 22 is fixed to the top of the guide sleeve 21, and the separating portion 24 is located below the driving portion 22 and is slidably mounted within the guide sleeve 21. Here, the guide sleeve 21 can be an independent component that is mounted within the mounting groove 111. The guide sleeve 21 can also be integrally formed with the housing 1 as part of the housing 1, that is, the driving portion 22 and the separating portion 24 are directly mounted within the housing 1.

[0099] In addition, the driving part 22 is arranged at the top opening of the guide sleeve 21 in the figure, and the driving part 22 can also be arranged inside the guide sleeve 21. The utility model does not limit the installation position of the driving part, as long as it can drive the separation part to move downward to the set position.

[0100] Continue to refer to Figures 1 to 7 and Figures 14 to 19 In a specific embodiment, the driving portion 22 includes a trigger portion 221 and an explosion portion 222 disposed between the separation portion 24 and the trigger portion 221. The trigger portion 221 is used to connect to an external signal transmission device and receive a signal transmitted by the signal transmission device. The trigger portion 221 triggers the explosion portion 222 to explode according to the signal, thereby driving the separation portion 24 to move downward and impact the movable contact piece 5, thereby separating the movable contact piece 5 from the static contact piece 4. The signal transmission device may, for example, be a device for transmitting a vehicle collision signal or a current overload signal, indicating an abnormality in the vehicle body or circuit; the explosion portion 222 may, for example, be a substance that can generate explosive impact force, such as explosive gas or powder; and the trigger portion 221 may, for example, be a device that can initiate the explosion of the explosion portion, such as an ignition device, a detonation device, or a discharge device.

[0101] In addition, after the movable contact piece 5 is hit by the separation part 24 and disconnected from the static contact piece 4, if the electromagnetic coil 33 is still in the energized state, the movable contact piece 5 will be pushed upward by the driving mechanism 3, thereby being connected to the static contact piece 4 again, causing the abnormal circuit to be connected again.

[0102] Therefore, in order to prevent the circuit from being connected again, the protection switch of the present invention prevents the moving contact piece 5 from being connected to the static contact piece 4 again through the following self-locking locking method. Figures 1 to 7 and Figures 14 to 19 , the side wall of the guide sleeve 21 is provided with an elastic locking portion 211, and the elastic locking portion 211 is arranged at the lower part of the guide sleeve 21 and corresponds to the set position. The elastic locking portion 211 protrudes inwardly relative to the inner wall of the guide sleeve 211 and can expand outwardly under the push (or impact) of the separation portion 24. The separation portion 24 is provided with a locking portion 241 corresponding to the elastic locking portion 211. In the process of the separation portion 24 moving from the initial position to the set position, the separation portion 24 slides downward and pushes the elastic locking portion 211 to expand outward; after the separation portion 24 moves to the set position, the locking portion 241 reaches a position opposite to the elastic locking portion 211, and the elastic locking portion 211 rebounds inwardly and is locked to the locking portion 241, so that the separation portion 24 is stopped by the elastic locking portion 211 through the locking portion 241, so that the separation portion 24 is limited to the set position and cannot move upward. Thus, Figure 5 and Figure 15As shown, the separation portion 24 is limited to the set position by the locking portion 241 and the elastic locking portion 211, which can ensure that when the driving mechanism 3 pushes the movable contact piece 5 upward again, the movable contact piece 5 is stopped by the separation portion 24. At this time, due to the restriction of the elastic locking portion 211, the separation portion 24 cannot move upward. Therefore, when the movable contact piece 5 moves upward, it will be blocked by the separation portion 24, which can prevent the movable contact piece 5 from being connected to the static contact piece 4 again.

[0103] Here, if Figures 14 to 19 As shown, the locking portion 241 is a groove provided on the side wall of the separating portion 24. After the separating portion 24 moves to the set position, the elastic locking portion 211 rebounds inward and locks into the groove, causing the bottom surface of the groove to abut against the elastic locking portion 211. The shape and size of the groove can be set to correspond to or slightly larger than the elastic locking portion 211 to facilitate the elastic locking portion rebounding into the groove. The groove can also be an annular groove surrounding the separating portion 24 to prevent the groove and the elastic locking portion 211 from being misaligned due to rotation of the separating portion, thereby improving the locking accuracy. Alternatively, the top wall of the separating portion 24 can serve as the locking portion 241 (not shown). After the separating portion 24 moves to the set position, the separating portion 24 is entirely located below the elastic member 211, and the elastic locking portion 211 rebounds inward and abuts against the top wall of the separating portion 24, which then abuts against the elastic locking portion 211.

[0104] Example 1:

[0105] Reference Figures 1 to 7 and Figures 14 to 17 In this embodiment 1, the locking method is specifically as follows.

[0106] like Figures 14 to 16 As shown, in this embodiment 1, the side wall of the guide sleeve 21 is provided with an opening 212 that passes through the inside and outside of the guide sleeve 21, and the elastic locking portion 211 includes: an elastic wall 2111 that is expandably provided in the opening 212, one end of the elastic wall 2111 is connected to the side wall of the opening 212, and the other end is provided with a sliding end surface 2112 and a limiting end surface 2113 that extends into the guide sleeve 21 and protrudes from the inner wall of the guide sleeve, the sliding end surface 2112 is inclined inwardly, and the limiting end surface 2113 is provided below the sliding end surface 2112, and the separation portion 24 can slide along the sliding end surface 2112, thereby pushing the elastic wall 2111 to expand outward with one end connected to the opening 212 as a fulcrum; after the separation portion 24 moves to the set position, the locking portion 241 reaches a position opposite to the other end of the elastic wall 211, and the elastic wall 2111 rebounds inward to the opening 212, and makes the sliding end surface 2112 and the limiting end surface 2113 snap into the locking portion 241 (taking the locking portion 241 as an annular groove provided on the side wall of the separation portion 24 as an example), so that the bottom surface of the annular groove stops at the limiting end surface 2113.

[0107] like Figures 14 to 16 As shown, preferably, the sliding end surface 2112 is inclined inward and downward at an acute angle. The sliding end surface 2112 is a concave arc surface corresponding to the bottom edge of the separation portion, so that the separation portion can fully contact the sliding end surface 2112, ensuring that the separation portion can exert sufficient driving force on the elastic wall 2111. Of course, the sliding end surface 2112 can also be configured as a flat surface or a convex arc surface, and the present invention is not limited to this. The limiting end surface 2113 and the bottom surface of the locking portion 241 are preferably parallel to the radial direction of the guide sleeve or inclined downward at a certain angle to prevent the separation portion from pushing the elastic wall 2111 upward to expand, thereby reconnecting the moving contact piece and the static contact piece.

[0108] like Figure 16 As shown, preferably, four elastic locking portions 211 are provided and are spaced and evenly spaced circumferentially around the guide sleeve 21, and correspondingly, four openings 212 are also provided. Alternatively, the number of elastic locking portions 211 may be greater or less than four. In other words, any number of elastic locking portions can achieve the function of locking the separation portion. Providing more elastic locking portions is simply to improve the stability of the restriction on the separation portion.

[0109] like Figure 16 As shown, preferably, opening 212 is an open U-shaped opening extending upward from the bottom of the guide sleeve. The top of the elastic wall 2111 is connected to the upper side wall of the U-shaped opening, and the sliding end surface 2112 and the limiting end surface 2113 are provided at the bottom end of the elastic wall 2111. At this time, the separation portion pushes the bottom end of the elastic wall to expand outward. Of course, opening 212 can also be a closed opening. Setting it as an open opening can facilitate production process and eliminate a cutting step compared to a closed opening.

[0110] In addition, as described above, the top end of the elastic wall 2111 is connected to the upper side wall of the opening. Alternatively, the bottom end of the elastic wall 2111 is connected to the lower side wall of the opening (in this case, the opening can be a closed opening, or an open opening extending downward from the top of the guide sleeve), the sliding end surface 2112 and the limiting end surface 2113 are provided at the top end of the elastic wall, and the separation portion pushes the top end of the elastic wall to expand outward. Alternatively, one circumferential end of the elastic wall is connected to the circumferential side wall of the opening, and the sliding end surface 2112 and the limiting end surface 2113 are provided at the other circumferential end of the elastic wall. That is, the present invention is not limited to the setting direction of the elastic wall. Different setting directions only result in different expansion directions of the elastic wall, as long as the elastic wall can be guaranteed to expand and rebound.

[0111] like Figures 14 to 17As shown, the guide sleeve 21 is disposed within the mounting groove 111. The sidewalls of the mounting groove 111 are provided with a mating groove 115 for cooperating with the expansion of the elastic wall. When the elastic wall expands, it enters the mating groove 115. Preferably, the mating groove 115 extends from the top to the bottom of the mounting groove 111. The circumferential length of the mating groove 115 is greater than the circumferential length of the opening 212. Support ribs 213 are embedded in the circumferential sides of the opening 212. The support ribs 213 position the opening 212 in the mating groove 115. Furthermore, the support ribs 213 enhance the installation strength of the guide sleeve. Furthermore, extending the mating groove 115 from the top to the bottom of the mounting groove 111 facilitates assembly of the guide sleeve. The guide sleeve can be assembled by simply inserting the guide sleeve from the top into the mounting groove 111.

[0112] Furthermore, an outwardly extending L-shaped flange 214 is provided on the upper portion of the guide sleeve 21. A flange groove 116 is provided on the upper shell 11, located above the mounting groove 111. The L-shaped flange 214 is embedded in the flange groove 116. The outer edge of the L-shaped flange 241 is provided with a limiting edge to prevent the guide sleeve from rotating, and the flange groove 116 is provided with a corresponding limiting edge. An outer sleeve 25 is also provided above the guide sleeve 21 for mounting the drive unit 22. The drive unit 22 is mounted on the upper portion of the outer sleeve 25, and the guide sleeve 21 is mounted on the lower portion of the outer sleeve 25. The bottom of the outer sleeve 25 is provided with an outer flange, which is mounted within the annular groove formed by the outer wall of the guide sleeve 21 and the L-shaped flange 214. The upper shell 11 is also provided with a fixing plate 26 for fixing the guide sleeve 21 and the outer sleeve 25 to the upper shell. Specifically, a through hole with a diameter equal to that of the outer sleeve 25 is provided in the middle of the fixing plate 26. The fixing plate 26 is nested within the outer sleeve 25 through a through-hole, thereby enclosing the outer flange 251 and the L-shaped flange 214 between the mounting plate and the upper housing 11. Threaded holes are provided on either side of the fixing plate 26, through which bolts 27 are passed and fastened to the upper housing 11. This structure secures the protective switch to the upper housing 11. Of course, other connection and fixing methods are possible for the protective switch; the above method is employed solely for ease of assembly. Assembly is accomplished by simply nesting the above components layer by layer. Furthermore, the separate structure of each component facilitates individual production.

[0113] like Figures 14 to 17As shown, preferably, an extension rod 28 is provided at the bottom of the separation part 24, and the extension rod 28 extends to above the moving contact piece 5. Specifically, a through hole connected to the first chamber 112 is provided at the bottom of the mounting groove 111, and the extension rod 28 extends into the first chamber 112 along the through hole at the bottom of the mounting groove 111. When the separation part 24 moves downward, the extension rod 28 hits the moving contact piece 5 to separate the moving contact piece 5 from the static contact piece 4. Thus, by providing the extension rod 28, the distance between the protection switch 2 and the moving contact piece 5 and the static contact piece 4 is extended to avoid damage to the moving contact piece and the static contact piece by the explosion of the explosion part. In addition, the separation part 24 extends to above the moving contact piece 5 through the extension rod 28, and the separation part 24 itself will not invade into the second chamber due to the obstruction of the mounting groove 111, so that the protection switch is separated from the moving contact piece and the static contact piece, and the piston part 241 is prevented from invading the second chamber due to excessive movement, thereby affecting the normal use of the contactor. As described above, Figure 14 As shown, the extension rod 28 is embedded in the separation portion 24. The extension rod 28 and the separation portion 24 can also be integrally formed.

[0114] like Figures 14 to 17 As shown, preferably, a guide sleeve 23 is provided between the explosion part 22 and the separation part 24, the upper end of the guide sleeve 23 surrounds the explosion part 22, and the lower end abuts against the top wall of the explosion part 22, for more accurately transmitting the explosion pressure generated by the explosion part 22 to the separation part 24.

[0115] Example 2:

[0116] The difference between the second embodiment and the first embodiment lies in the specific structure of the elastic locking portion 211 .

[0117] like Figure 18 and Figure 19 As shown, the elastic locking portion 211 is a locking hook piece provided on the side wall of the guide sleeve, and the locking hook piece extends inwardly from the inner wall of the guide sleeve 21. When the separation portion 24 moves from the initial position to the set position, the separation portion 24 pushes the locking hook piece to expand outward; when the separation portion 24 moves to the set position, the part of the separation portion 24 located below the locking portion 241 passes over the locking hook piece, and the locking portion 241 reaches a position opposite to the locking hook piece, and the locking hook piece rebounds inward and is locked into the locking portion 241, so that the separation portion is abutted against the locking piece through the locking portion.

[0118] Furthermore, a gap structure is provided between the separating portion 24 and the guide sleeve 21. The gap structure may, for example, be a receiving groove provided on the inner wall of the guide sleeve 21. The receiving groove is configured to accommodate the expansion of the locking hook piece. When the separating portion 24 pushes the locking hook piece to expand outward to its maximum position, the locking hook piece enters the receiving groove, thereby ensuring that the portion of the separating portion 24 below the locking portion 241 can pass over the locking hook piece without being blocked by the locking hook piece. Alternatively, the gap structure may be an inner guide groove provided on the side wall of the separating portion, extending axially and configured to accommodate the expansion of the locking hook piece. When the separating portion 24 pushes the locking hook piece to expand outward to its maximum position, the locking hook piece enters the inner guide groove and abuts against the bottom of the inner guide groove, similarly ensuring that the portion of the separating portion 24 below the locking portion 241 can pass over the locking hook piece without being blocked by the locking hook piece. At the same time, the inner guide groove also prevents the separating portion from rotating during movement. Of course, both the receiving groove and the guiding inner groove can be provided. Alternatively, the diameter of the portion of the separating portion 24 below the locking portion 241 can be set smaller than the inner diameter of the guiding sleeve 21 as the gap structure. This can also ensure that the portion of the separating portion 24 below the locking portion 241 can pass over the locking hook piece without being blocked by the locking hook piece, and ensure that the outer wall of the separating portion 24 is always in contact with the locking hook piece during the process of the separating portion 24 pushing the locking hook piece to expand outward.

[0119] In a preferred embodiment, the locking hook piece is inclined inward and downward at an acute angle, and the contact surface between the locking hook piece and the separating portion is an arcuate surface corresponding to the bottom edge of the separating portion, so that the separating portion can fully contact the locking hook piece, ensuring that the separating portion can exert sufficient pushing force on the locking hook piece. The bottom surface of the locking hook piece and the bottom surface of the locking portion are preferably parallel to the radial direction of the guide sleeve or inclined downward to reduce the possibility of the separating portion pushing the locking hook piece upward to expand.

[0120] Another embodiment of the present invention further provides a circuit system, comprising the contactor in any of the above embodiments.

[0121] Compared with the locking structure on the existing integrated contactor, the present invention does not need to design a separate locking structure inside the contactor because the protection switch has its own locking structure. The internal structure of the contactor is simpler, which reduces the design difficulty of the contactor. In addition, since the self-locking mechanism of the present invention is arranged in the protection switch, it will not affect the driving mechanism of the contactor and will not affect the switching of the contactor under normal circumstances.

[0122] The above is a detailed introduction to the scheme of the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for general technical personnel in this field, based on the ideas of the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

[0123] References throughout this specification to "one embodiment," "an embodiment," or "a specific embodiment" mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application, and not necessarily in all embodiments. Thus, various appearances of the phrases "in one embodiment," "in an embodiment," or "in a specific embodiment" in different places throughout this specification are not necessarily referring to the same embodiment. Furthermore, the particular features, structures, or characteristics of any specific embodiment of the present application may be combined with one or more other embodiments in any suitable manner. It should be understood that other variations and modifications of the embodiments of the present application described and illustrated herein are possible in light of the teachings herein and are considered part of the spirit and scope of the present application.

[0124] It should also be understood that one or more of the elements shown in the figures may also be implemented in a more separate or more integrated manner, or even removed because they are inoperable in certain circumstances or provided because they may be useful depending on the application.

[0125] In addition, unless otherwise expressly indicated, any marking arrows in the drawings should be regarded as illustrative only and not limiting. Furthermore, unless otherwise indicated, the term "or" as used herein is generally intended to mean "and / or." Where a term is unclear in providing separation or combination capabilities, the combination of components or steps will also be considered as indicated.

Claims

1. A contactor with a protective switch, characterized in that: include: A protection switch, a static contact piece, a moving contact piece, and a driving mechanism for driving the moving contact piece to separate from or contact the static contact piece. The protection switch includes a guide sleeve, a driving part and a separation part slidably mounted in the guide sleeve, wherein the driving part is used to selectively drive the separation part to move from an initial position to a set position so that the separation part separates the movable contact piece and the static contact piece, wherein: An elastic locking portion is provided on the side wall of the guide sleeve, and the elastic locking portion at least partially protrudes from the inner wall of the guide sleeve and can expand outward under the push of the separation portion. The separation portion is provided with a locking portion corresponding to the elastic locking portion, The elastic locking portion is used to expand outwards when the separating portion moves from the initial position to the set position and rebound inwards to the locking portion after the separating portion moves to the set position, so as to limit the separating portion to the set position.

2. The contactor according to claim 1, characterized in that The side wall of the guide sleeve is provided with an opening, The elastic locking portion includes: an elastic wall expandably arranged in the opening, one end of the elastic wall is connected to the side wall of the guide sleeve, and the other end is provided with a sliding end surface and a limiting end surface extending into the guide sleeve, the sliding end surface is inclined inward and downward, and the limiting end surface is arranged below the sliding end surface. The separation portion can slide along the sliding end surface to push the elastic wall to expand outward to form the opening; after the separation portion moves to the set position, the elastic wall rebounds inward to the opening, and causes the sliding end surface and the limiting end surface to be locked into the locking portion, so that the separation portion is stopped at the limiting end surface.

3. The contactor according to claim 2, characterized in that It also includes a housing, a mounting groove is provided on the top of the housing, and the guide sleeve is installed in the mounting groove. The inner wall of the installation groove is provided with a matching groove for matching the expansion of the elastic wall.

4. The contactor according to claim 3, characterized in that The circumferential length of the matching groove is greater than that of the opening, and support ribs embedded in the circumferential sides of the matching groove are provided on both circumferential sides of the opening.

5. The contactor according to claim 1, characterized in that The elastic locking portion includes a locking hook piece inclined inward and downward from the inner wall of the guide sleeve. When the separation portion moves from the initial position to the set position, the locking hook piece expands outward; when the separation portion moves to the set position, the locking hook piece rebounds inward to the locking portion, so that the separation portion stops at the locking hook piece.

6. The contactor according to claim 5, characterized in that A gap structure is provided between the separation portion and the guide sleeve, and the gap structure is used to accommodate the locking hook piece when the separation portion pushes the locking hook piece to expand outward.

7. The contactor according to any one of claims 1 to 6, characterized in that: The number of the elastic locking parts is more than two.

8. The contactor according to any one of claims 1 to 6, characterized in that: The driving part includes a trigger part and an explosion part provided between the separation part and the trigger part, wherein the trigger part is used to receive an external signal and trigger the explosion part to explode according to the signal, thereby driving the separation part to move; and / or An extension rod is provided at the bottom of the separation portion, and the separation portion can separate the movable contact piece and the static contact piece through the extension rod.

9. The contactor according to claim 8, characterized in that A guide sleeve is provided between the explosion part and the separation part.

10. A circuit system, characterized in that: The contactor comprises the contactor according to any one of claims 1 to 9.

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