Contactor and circuit system

Abstract

The utility model discloses a contactor and a circuit system, and the contactor comprises a housing which is internally provided with an arc extinguishing cavity. The two static contact pieces are oppositely arranged, each static contact piece comprises a static piece contact part and a connecting part, the static piece contact parts are arranged in the arc extinguishing cavity, and the connecting parts are arranged outside the shell and used for being connected with external equipment; the movable contact piece is arranged in the arc extinguishing cavity, movable piece contact parts are arranged at the two ends of the movable contact piece, and the movable piece contact parts are in separable contact with the static piece contact parts of the two static contact pieces so as to disconnect or connect the two static contact pieces; the arc chute is formed by stacking a plurality of grid pieces, the arc chute surrounds the static piece contact part and the movable contact piece, and the top grid piece of the arc chute is connected with the static piece contact part in an equipotential manner; and the arc striking mechanism is used for generating a guide magnetic field, and the guide magnetic field is used for deflecting an arc generated when the moving part contact part is separated from the static part contact part to the arc chute for extinguishing. According to the utility model, the problem of low arc extinguishing efficiency of the arc extinguishing structure of the contactor in the prior art is solved.

Description

Technical Field

[0001] This utility model belongs to the field of circuit system control, and specifically relates to a contactor and circuit system. Background Technology

[0002] Contactors, electromagnetic switching devices used to control the flow of current in power circuits, include moving contacts and stationary contacts. During operation, a drive mechanism controls the moving contact to move up and down, closing or separating from the stationary contact, thus connecting or disconnecting the circuit. During the separation of the moving contact, due to the significant energy present in the circuit system, arcing may occur. To extinguish the arc, arc-extinguishing cavities are typically provided on the sides of the moving and stationary contacts. An induced magnetic field draws the arc into the grid plates within the arc-extinguishing cavity, causing the arc to cool and extinguish rapidly. For example, Chinese utility model patent CN201610938374.7 discloses a DC contactor with an arc-extinguishing mechanism that includes arc-extinguishing grids on both sides of the moving and stationary contacts, and how a magnetic field guides the arc to the arc-extinguishing grids.

[0003] However, in the arc extinguishing structure of the prior art, since the arc extinguishing grid and the moving and stationary contacts are separated, i.e. there is a gap between the arc extinguishing grid and the moving and stationary contacts, the arc can only move into the arc extinguishing grid by relying on the deflection effect of the magnetic field, resulting in a relatively constant arc moving speed and low arc extinguishing efficiency. Utility Model Content

[0004] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a contactor and circuit system, thereby solving the problem of low arc extinguishing efficiency of the arc extinguishing structure of the contactor in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A contactor, comprising:

[0007] A housing, wherein an arc-extinguishing cavity is provided inside the housing;

[0008] Two stationary contacts are arranged opposite each other. Each stationary contact includes a stationary contact portion and a connecting portion. The stationary contact portion is located inside the arc-extinguishing cavity, and the connecting portion is located outside the housing for connection with external equipment.

[0009] The moving contact located in the arc-extinguishing cavity has moving contact portions at both ends. The moving contact portions can detachably contact the stationary contact portions of the two stationary contacts to disconnect or connect the two stationary contacts.

[0010] An arc-extinguishing grid surrounds the stationary contact portion and the moving contact portion. The arc-extinguishing grid is composed of a top-layer grid and multiple lower-layer grids stacked together. The top-layer grid is equipotentially connected to the stationary contact portion.

[0011] An arc-initiating mechanism is provided, which generates a guiding magnetic field to deflect the electric arc generated when the moving contact part separates from the stationary contact part to the arc-extinguishing grid for extinguishing.

[0012] In one embodiment of this utility model, the edge of the moving contact is provided with a downwardly folded arc-inducing angle, which is used to lengthen the electric arc and shorten the distance from the electric arc to the arc-extinguishing grid.

[0013] As one embodiment of this utility model, the arc-extinguishing cavity is further provided with: an arc-extinguishing mesh surrounding the arc-extinguishing grid, and / or a solid gas-generating material for generating gas to cool the electric arc.

[0014] In one embodiment of this utility model, one side of the top grid plate has a connecting flange, and the stationary contact part is fixedly connected to the connecting flange.

[0015] In one embodiment of this utility model, the arc-extinguishing grid further includes a fixing plate, and the top grid plate and the plurality of lower grid plates are stacked and fixed to the fixing plate.

[0016] In one embodiment of this utility model, the arc-initiating mechanism includes two magnets arranged opposite to each other, with opposite magnetic poles of the two magnets facing each other. The stationary contact part and the moving contact part are located between the two magnets, and the guiding magnetic field formed between the two magnets applies a Lorentz force toward the arc-extinguishing grid to the electric arc.

[0017] In one embodiment of this utility model, the arc-initiating mechanism further includes two magnetic guide frames, which are used to enhance the magnetic field strength of the guiding magnetic field.

[0018] In one embodiment of this utility model, the side wall of the housing is provided with a side groove surrounding the arc-extinguishing cavity, and the magnet and the magnetic guide frame are embedded in the side groove.

[0019] In one embodiment of this utility model, the housing includes an upper housing and a lower housing. The upper housing is provided with the arc-extinguishing cavity, and the lower housing is provided with a driving mechanism for driving the moving contact to separate and contact with the stationary contact.

[0020] To achieve the above objectives, the present invention also adopts the following technical solution:

[0021] A circuit system comprising the contactor described above.

[0022] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0023] 1. This utility model connects the top layer of the arc-extinguishing grid with the stationary contact portion of the stationary contact at the same potential, thereby eliminating the potential difference between the top layer of the grid and the stationary contact. This allows the arc root to move to the top layer of the grid more quickly, and the entire arc to enter the arc-extinguishing grid and be extinguished more quickly, thus improving the arc-extinguishing efficiency of the contactor.

[0024] 2. This utility model features a downward-folding arc-inducing angle at the edge of the moving contact. This allows the arc root at the moving contact end of the arc to move downward under the guidance of the arc-inducing angle, thereby lengthening the arc and enabling it to contact more grid plates, thus improving the utilization rate of the arc-extinguishing grid. At the same time, the arc-inducing angle shortens the distance from the arc root to the arc-extinguishing grid, allowing the arc to move to the arc-extinguishing grid more quickly, further improving the arc-extinguishing efficiency of the contactor. In addition, the arc-inducing angle can also extend the contact life of the moving contact and prevent the arc from burning at the contact point. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is an exploded view of a contactor according to a specific embodiment of the present invention;

[0027] Figure 2 This is a cross-sectional view of the contactor in the disengaged state in one direction;

[0028] Figure 3 This is a cross-sectional view of the contactor in the disengaged state from another direction;

[0029] Figure 4 This is a cross-sectional view of the contactor in the engaged state from one direction.

[0030] Figure 5 This is a cross-sectional view of the contactor in the engaged state from another direction.

[0031] Figure 6 This is a schematic diagram of the connection structure between the stationary contact and the arc-extinguishing grid;

[0032] Figure 7 This is a structural schematic diagram of the moving contact;

[0033] Figure 8 This is a schematic diagram of the connection structure between the stationary contact part and the arc-extinguishing grid;

[0034] Figure 9 This is a cross-sectional view of the connection structure between the stationary contact and the arc-extinguishing grid in one direction;

[0035] Figure 10 This is a cross-sectional view of the connection structure between the stationary contact and the arc-extinguishing grid in another direction.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. Housing; 11. Upper outer shell; 111. First chamber (arc extinguishing chamber); 112. Contact hole; 113. Mounting bolt; 114. Side groove; 12. Lower outer shell; 121. Second chamber; 122. Mounting base;

[0038] 3. Drive mechanism; 31. Magnetic pole piece; 32. Yoke; 321. Positioning hole; 33. Electromagnetic coil; 331. Coil frame; 3311. Positioning boss; 332. Coil winding; 333. Protective layer; 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. Drive rod; 381. Screw part; 39. Return spring.

[0039] 4. Stationary contact; 41. Stationary contact (stationary contact part); 42. Connecting part; 43. Contact bolt;

[0040] 5. Moving contact; 50. Connecting hole; 51. Moving contact part; 52. Arc-starting angle;

[0041] 6. Overtravel spring;

[0042] 7. Arc extinguishing mechanism; 71. Arc extinguishing grid; 710. Grid plate; 7101. Top layer grid plate; 71011. Connecting flange; 7102. Lower layer grid plate; 711. Enclosing groove; 712. Fixing plate; 72. Arc extinguishing net.

[0043] 8. Arc-starting mechanism; 81. Magnet; 82. Magnetic guide frame; 821. Base plate; 822. Side plate. Detailed Implementation

[0044] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model. Furthermore, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model.

[0045] In this utility model, unless otherwise stated, directional terms such as "up", "down", "left", "right", "front", and "back" generally refer to the up, down, left, and right directions in the actual use or working state of the device, specifically the directions shown in the accompanying drawings.

[0046] It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments of this application. Furthermore, the descriptions of each embodiment in the following embodiments have their own emphasis; for parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0047] 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, and a stationary contact. Its working 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 exert an electromagnetic attraction, drawing the moving iron core closer to it. This causes the push rod, connected to the moving iron core, to move the moving contact into contact with the stationary contact, thus closing the circuit. When the coil is de-energized, the magnetic field disappears (the electromagnetic attraction disappears), and the moving iron core, under the force of the return spring, moves away from the stationary iron core. This causes the push rod, connected to the moving iron core, to move the moving contact away from the stationary contact, thus breaking the circuit. During the separation of the moving and stationary contacts, due to the significant energy present in the circuit system connected to the contactor, an electric arc will be generated between the contact points. If this arc is not extinguished in time, it may burn out the moving and stationary contacts and other components of the contactor, rendering the contactor unusable.

[0048] Therefore, in order to extinguish the electric arc, traditional contactors are usually equipped with an arc-extinguishing system. For example, an arc-extinguishing cavity is set on the side of the contact area of ​​the moving and stationary contacts. The arc is pulled into the grid plate in the arc-extinguishing cavity by an induced magnetic field, so that the arc is quickly cooled and extinguished. However, the structural design of the arc-extinguishing system of traditional contactors has many unreasonable aspects.

[0049] Based on this, the present invention provides a contactor with a more improved structural design for an arc extinguishing system. The contactor of the present invention will be described in detail below.

[0050] like Figures 1 to 10 As shown, a specific embodiment of this utility model provides a contactor, which includes a housing 1; and a driving mechanism 3, a moving contact 5, and a stationary contact 4 arranged sequentially from bottom to top on the housing 1. Two stationary contacts 4 are spaced apart and are used to connect to an external circuit system. The driving mechanism 3 is connected to the moving contact 5 and is used to drive the moving contact 5 to contact or separate from the stationary contacts 4, thereby connecting or disconnecting the two stationary contacts 4. In addition, an arc-extinguishing mechanism 7 is provided inside the housing 1 to extinguish the electric arc generated when the moving contact 5 separates from the stationary contact 4. Furthermore, the contactor also includes an arc-initiating mechanism 8 for guiding the electric arc to the arc-extinguishing mechanism 7.

[0051] like Figures 1 to 5As shown, in one specific embodiment, the housing 1 includes an upper housing 11 and a lower housing 12. The upper housing 11 is formed as a box with a first chamber 111 and an opening at the lower end, and the lower housing is formed as a box with a second chamber 121 and an opening at the upper end. The upper housing 11 and the lower housing 12 are engaged to connect the first chamber 111 and the second chamber 121. Thus, by setting the housing as a split structure including an upper housing and a lower housing, the assembly of the contactor can be facilitated. However, the housing may not adopt the aforementioned split structure; it may be an integral structure or other types of split structures, and this invention is not limited to these. Furthermore, as... Figures 1 to 5 As shown, the bottom of the lower housing 12 is also provided with two mounting bases 122 with through holes. The mounting bases 122 are used to fix the contactor to the electrical equipment to be used.

[0052] Furthermore, continue to refer to 1 to Figure 5 The driving mechanism 3 is located in the second chamber 121, and the moving contact 5 is located in the first chamber 111. The driving mechanism 3 is used to drive the moving contact 5 to move up and down in the first chamber 111. The stationary contact 4 includes a plate-shaped connecting part 42 and a stationary contact 41 as a stationary contact part. The top wall of the upper housing 11 is provided with two contact holes 112 communicating with the first chamber 111. The two contact holes 112 are spaced apart on the top wall of the upper housing 11. The contact holes 112 are countersunk holes, and the stationary contact 41 is formed into a cylindrical shape with a flange at the top that matches the countersunk hole. The two stationary contacts 41 are respectively nested in the contact holes 112, and the lower end of the stationary contact 41 extends into the first chamber 111, so that it can contact the moving contact 5 in the first chamber 111. In addition, two connecting parts 42 are installed on the outer surface of the top wall of the upper housing 11 (i.e., the connecting parts 42 are located outside the housing 1). The stationary contact 41 has a threaded hole at its center, and the two connecting parts 42 have through holes at their opposite ends. The connecting parts 42 are fixed to the stationary contact 41 by means of contact bolts 43 passing through the through holes and being threadedly connected to the threaded holes. The first chamber 111 has a certain depth to ensure that the moving contact 5 can move up and down within the first chamber 111. Furthermore, the first chamber 111 also serves as an arc-extinguishing chamber for installing the arc-extinguishing mechanism 7.

[0053] The driving mechanism 3 of this utility model will be described below. In this embodiment, the driving mechanism 3 is an electromagnetic driving mechanism. It should be noted that the driving mechanism 3 can also be other types of driving mechanisms such as pneumatic or hydraulic driving mechanisms in the prior art, as long as they can achieve the function of driving the moving contact 5. The following only describes the electromagnetic driving mechanism used in one embodiment of this utility model, and this utility model is not limited thereto.

[0054] like Figures 1 to 5As 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 sleeve 34, a sliding sleeve 35, a moving 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 upwards 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 frame installed in the second chamber 121. Furthermore, the base plate of the yoke 32 has a positioning hole 321 at its center, and the bottom of the magnetic sleeve 34 is nested within the positioning hole 321 on the base plate. The top of the magnetic sleeve 34 is spaced a certain distance from the magnetic pole piece 31. The electromagnetic coil 33 includes a coil frame 331, a coil winding 332 wound on the coil frame 331, and a protective layer 333 covering the coil winding 332. In addition, the electromagnetic coil 33 also has lead-out electrode pieces (not shown) connected to the coil winding 332. The lead-out electrode pieces extend out of the housing 1, and the electromagnetic coil 33 is connected to an external power supply device through the lead-out electrode pieces to generate a magnetic field. The coil frame 331 is connected between the yoke 32 and the magnetic pole piece 31 and is sleeved on the magnetic sleeve 34. Specifically, the coil frame 331 is formed into a sleeve shape with flanges at both ends. The inner wall of the central hole of the sleeve is provided with a positioning boss 3311 positioned at the top of the magnetic sleeve 34. The top flange of the coil frame 331 abuts against the lower surface of the magnetic pole piece 31, and the bottom flange of the coil frame 331 abuts against the upper surface of the bottom plate of the yoke 32. The sliding sleeve 35 is formed as a bottomed sleeve with an open top and a flange, and a closed bottom. The top flange of the sliding sleeve 35 is fixed between the top flange of the magnetic pole piece 31 and the coil frame 331. The lower section of the cylindrical part of the sliding sleeve 35 is nested in the magnetic sleeve 34, and the upper section of the cylindrical part is located in the center hole of the coil frame 331. The moving iron core 36 and the stationary iron core 37 are disposed in the sliding sleeve 35. The upper part of the stationary iron core 37 is provided with a boss, and the stationary iron core 37 is nested in the center through hole of the magnetic pole piece 31 through the boss. The moving iron core 36 is slidably disposed below the stationary iron core 37. The lower end of the drive rod 38 is connected to the moving iron core 36, and the upper end extends through the center through hole of the stationary iron core 37 to the first chamber 111 and is connected to the moving contact 5. A return spring 39 is provided between the moving iron core 36 and the stationary iron core 37, and the return spring 39 is sleeved on the drive rod 38. Among them, the magnetic pole piece 31, yoke 32, magnetic sleeve 34, moving iron core 36, and stationary iron core 37 are collectively referred to as magnetic conductive components. When the electromagnetic coil 33 is energized, a magnetic field is formed within these magnetic conductive components. In the non-energized state, the stationary iron core 37 and the moving iron core 36 are separated by the return spring 39, and a gap exists between the stationary iron core 37 and the moving iron core 36. The two ends of the gap (the lower end of the stationary iron core 37 and the upper end of the moving iron core 36) generate N and S poles with different polarities. The opposite magnetic poles generate magnetic attraction, causing the moving iron core to move upward until it connects with the stationary iron core (i.e., the gap closes).

[0055] The working principle of the drive 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 aforementioned magnetic conductor). The generated magnetic field causes the stationary iron core 37 to attract the moving iron core 36 to slide upward (at this time, the return spring 39 is compressed), causing the drive rod 38 connected to the moving iron core 36 to push the moving contact 5 towards the stationary contact 4. The moving contact 5 and the stationary contact 4 then make contact and connect, thereby closing the circuit (i.e., the contactor starts from...). Figure 2 and Figure 3 The separation state is transformed into Figure 4 and Figure 5 (In the engaged state); when the coil is de-energized, the magnetic field disappears, and under the elastic restoring force of the return spring 39, the moving iron core 36 is pushed downward, causing the drive rod 38 connected to the moving iron core 36 to move the moving contact 5 away from the stationary contact 4, thus disconnecting the moving contact 5 from the stationary contact 4, thereby breaking the circuit (i.e., the contactor is de-energized from the stationary contact 4). Figure 4 and Figure 5 The attraction state is converted to Figure 2 and Figure 3 (separation state).

[0056] like Figures 1 to 5 As shown, in one specific embodiment, the moving iron core 36 has a moving core inner groove 361, and the stationary iron core 37 has a stationary core inner groove 371. One end of the return spring 39 is connected to the moving core inner groove 361, and the other end is connected to the stationary core inner groove 371. Furthermore, the moving iron core 36 also has a threaded hole 362 located below the moving core inner groove 361, and the lower end of the drive rod 38 has a screw portion 381, which is threadedly connected to the threaded hole 362. Thus, the drive rod 38 is adjustablely connected to the moving iron core 36 via the screw portion 381, allowing for adaptive adjustment of the initial distance between the moving contact 5 and the stationary contact 4 during contactor assembly to meet the contactor's assembly accuracy.

[0057] like Figures 1 to 5 As shown, in one specific embodiment, the drive rod 38 also has an overtravel spring 6, one end of which is fixed to the moving contact 5, and the other end of which is fixed to the middle section of the drive rod 38. Thus, when the contactor is in the engaged state, the overtravel spring 6 can be compressed, thereby providing further resistance to the contact between the moving and stationary contacts through the rebound force of the overtravel spring 6, making the contact between the moving and stationary contacts more reliable and stable. Simultaneously, the overtravel spring 6 can also act as a buffer when the moving contact 5 separates from the stationary contact 4 through its rebound force.

[0058] like Figures 1 to 7As shown, in one specific embodiment, the moving contact 5 is disposed below the two stationary contacts 41, including moving contact portions 51 at both ends and a connecting hole 50 in the middle. A drive rod 38 is fixed to the connecting hole 50. The drive rod 38 pushes the moving contact, thereby connecting or separating the moving contact portions 51 from the stationary contacts 41, to achieve separable contact between the moving contact 5 and the stationary contacts 4. Specifically, when the moving contact 5 moves upward, the moving contact portions 51 at both ends contact the stationary contacts 41 of the two stationary contacts 4 respectively, thereby connecting the two stationary contacts 4 to complete the circuit; when the moving contact 5 moves downward, the moving contact portions 51 at both ends separate from the stationary contacts 41 of the two stationary contacts 4 respectively, thereby disconnecting the connection between the two stationary contacts 4 to disconnect the circuit. The electric arc generated when the moving contact portions 51 separate from the stationary contacts 41 will be guided by the arc-initiating mechanism 8 (described later) to the arc-extinguishing mechanism 7, where it will be cooled and extinguished.

[0059] The following is a detailed explanation of how the contactor of this utility model achieves arc extinguishing.

[0060] As described above, the stationary contacts 41 of the two stationary contacts 4 are detachably in contact with the moving contact portions 51 at both ends of the moving contact 5 (i.e., detachably in contact by driving the moving contact 5 through the drive mechanism 3). The contactor, as a switching device for a high-voltage circuit, is connected to the high-voltage circuit system via the two stationary contacts 4. Therefore, when the moving contact 5 separates from the stationary contacts 4, the current in the high-voltage circuit will generate two arcs between the two stationary contacts 41 and the two moving contact portions 51 (i.e., an arc is generated between the stationary contact 41 on one side and the moving contact portion 51 at one end, and an arc is also generated between the stationary contact 41 on the other side and the moving contact portion 51 at the other end), and the current directions of the two arcs are opposite. Specifically, since the moving contact 5 is located below the two stationary contacts 4, and the direction of the current is constant, i.e., it flows from one stationary contact 4 along the moving contact 5 to the other stationary contact 4. Figure 1 , Figure 2 and Figure 4 For example, assuming the current flows from left to right, when the current flows from the stationary contact 4 on the left to the moving contact 5, the current will turn downwards from the stationary contact 41 of the left stationary contact 4. When the current flows from the moving contact 5 to the stationary contact 4 on the right, the current in the moving contact 5 will turn upwards from the right moving contact portion 51 of the moving contact 5. Therefore, when the moving contact 5 separates from the stationary contact 4, the current direction of the arc generated on the left is downwards, and the current direction of the arc generated on the right is upwards. Conversely, if the current flows from right to left, the current direction of the arc generated on the left is upwards, and the current direction of the arc generated on the right is downwards. Therefore, this invention can extinguish both arcs simultaneously using the arc-extinguishing mechanism 7 and the arc-initiating mechanism 8.

[0061] Specifically, such as Figures 1 to 10 As shown, the arc-extinguishing mechanism 7 is installed in the first chamber 111, which serves as the arc-extinguishing chamber. Since there are two arcs, there are also two arc-extinguishing mechanisms 7. Each arc-extinguishing mechanism 7 includes an arc-extinguishing mesh 72 and an arc-extinguishing grid 71 composed of multiple layers of grid plates 710 stacked together. Each grid plate 710 is a rectangular grid plate with a groove on one side. The shape of the groove is adapted to the shape of the two ends of the stationary contact 41 and the moving contact 5 and is slightly larger than the dimensions of the two ends of the stationary contact 41 and the moving contact 5. The multiple grid plates 710 are stacked and fixed by a fixing plate 712. The fixing plate 712 has multiple slots spaced apart along its length. Each grid plate 710 has a buckle that engages with the slot. The multiple grid plates 710 are stacked and fixed to the fixing plate 712 by the buckles engaging with the slots. Furthermore, the fixing plate 712 is made of insulating material to insulately separate each grid plate 710, thereby enabling the arc-extinguishing grid 71 to separate the arcs. Preferably, there are two fixing plates 712, each fixed to the front and rear sides of the arc-extinguishing grid 7. This forms a surrounding groove 711 of a certain depth on one side of the arc-extinguishing grid 71. The two arc-extinguishing grids 7 are fixed to the first chamber 111 in a non-contact manner, surrounding the stationary contact 41 and the moving contact 5 through the surrounding groove 711 (since the size of the groove is larger than the sizes of the two ends of the stationary contact 41 and the moving contact 5, a non-contact surrounding can be formed). This allows the sides of the two arc-extinguishing grids 71 ​​with the surrounding groove 711 to be positioned opposite each other, enabling the moving contact 5 to move up and down while surrounded by the two surrounding grooves 711. Preferably, the stationary contact 41 is a typical cylindrical contact, and the moving contact 5 is an elongated strip with semi-circular ends to fit the stationary contact 41. Therefore, the surrounding groove 711 (the groove of the grid plate) is also semi-circular and its diameter is larger than the semi-circular ends of the stationary contact 41 and the moving contact 5. When the moving contact 5 and the stationary contact 4 disconnect, generating two arc segments, these two arc segments can be guided by the arc-initiating mechanism 8 (described later) to their respective arc-extinguishing grids 7, where they are separated into multiple short arc segments for cooling and extinguishing. Thus, by surrounding the moving contact 5 and the stationary contact 41 with these arc-extinguishing grids, the arc can be deflected to the arc-extinguishing grid regardless of the arc-initiating direction of the arc-initiating mechanism (described later), thereby improving the design freedom and installation convenience of the arc-initiating mechanism. Furthermore, the arc-extinguishing grid 7 surrounds the stationary contact 41 and the moving contact 5 in a non-contact manner, thus preventing the arc from remaining connected to the circuit system through the stationary and moving contacts when it moves to the arc-extinguishing grid.

[0062] Further, there are two arc extinguishing nets 72, which are arranged in the first chamber 111 in a form of respectively surrounding the two arc extinguishing grids 71. Specifically, the arc extinguishing net 72 is formed into a "匚"-shaped matching the arc extinguishing grid 71, and surrounds the side surface of the arc extinguishing grid 71 that does not directly contact the electric arc (that is, the side surface facing away from the surrounding groove 711). In addition, the arc extinguishing net 72 is made of a metal material (for example, SUS316L stainless steel can be used, but not limited thereto), and a solid gas-producing material that can be vaporized at high temperature to produce gas is also provided thereon (for example, POM, PA, PTFE, etc. can be used, but not limited thereto). Here, the reason for setting the metal arc extinguishing net 72 with the solid gas-producing material is that when the electric arc energy is large, the electric arc will pass through the arc extinguishing grid 71 and then touch the arc extinguishing net 72 arranged behind the arc extinguishing grid 71. The electric arc will ablate the metal arc extinguishing net, thereby consuming a large amount of electric arc energy and generating high temperature, causing the solid gas-producing material on the arc extinguishing net 72 to decompose into a hydrogen-containing mixed gas at high temperature. The electric arc can be cooled by this mixed gas to prevent the high-temperature electric arc from damaging the contactor. Thus, efficient and reliable arc extinguishing can be achieved under the action of the above arc extinguishing mechanism. Preferably, the solid gas-producing material is formed into a sheet shape that fits the arc extinguishing net 72 to increase the contact area between the high temperature generated by the electric arc and the solid gas-producing material and improve the gas production efficiency. In addition, the solid gas-producing material may not be provided on the arc extinguishing net 72, and the solid gas-producing material may be directly provided in the first chamber 111, such as directly provided on the inner wall of the first chamber 111, or the outer shell 1 may be directly made of the solid gas-producing material. In addition, the arc extinguishing net 72 may be cancelled, and only the solid gas-producing material may be provided.

[0063] Further, the arc ignition mechanism 8 is used to form a guiding magnetic field, and the guiding magnetic field is used to apply a Lorentz force to the two electric arcs, so that the two electric arcs deflect from the static contact and the moving contact into the arc extinguishing grid 71, so that the arc extinguishing grid 7 can separate the electric arc into multiple short electric arcs to be cooled and extinguished. The guiding magnetic field formed by the arc ignition mechanism 8 of the present invention can guide the two electric arcs with different current directions into their respective arc extinguishing grids 71.

[0064] Specifically, the direction of the magnetic induction line of the guiding magnetic field is orthogonal to the current direction of the electric arc, and can apply forward and backward Lorentz forces to the two electric arcs respectively. Again, taking Figure 1 、 Figure 2 和 Figure 4For example, if the direction of the magnetic field lines of the guiding magnetic field is the length direction of the contactor (i.e., the left-right direction in the figure), and the direction of the current in the arc is the height direction of the contactor (i.e., the up-down direction in the figure), then the direction of the Lorentz force on the arc is perpendicular to the plane of the paper and the width direction of the contactor (i.e., the front-back direction in the figure). Assuming the current direction is, for example, from the left stationary contact 4 to the right stationary contact 4, and the guiding mechanism 8 is configured so that the direction of the magnetic field lines of the guiding magnetic field it forms is, for example, from left to right, then according to the left-hand rule, the current direction of the arc on the left is downward, and it experiences a Lorentz force perpendicular to the plane of the paper and forward (closer to the observer); the current direction of the arc on the right is upward, and it experiences a Lorentz force perpendicular to the plane of the paper and backward (away from the observer). Then, under the action of their respective Lorentz forces, the two arc segments deflect from the stationary and moving contacts towards their respective arc-extinguishing grids 71, thus allowing the arc to be deflected to the arc-extinguishing grids 71 ​​under the influence of the guiding magnetic field and extinguished within them. Alternatively, the current can flow from the right stationary contact 4 to the left stationary contact 4. In this case, the current direction of the left arc is upward, and it experiences a Lorentz force perpendicular to the paper and backward (away from the observer); the current direction of the right arc is downward, and it experiences a Lorentz force perpendicular to the paper and forward (closer to the observer). Alternatively, the magnetic field lines guiding the magnetic field can be directed from right to left, in which case the direction of the Lorentz force on the left and right arcs also changes.

[0065] In one specific embodiment, the arc-initiating mechanism 8 includes two magnets 81 arranged opposite each other along its length, two arc-extinguishing grids 71, a moving contact 5, and stationary contacts 41 of two stationary contacts 4, all located between the two magnets 81. The opposite magnetic poles of the two magnets 81 are arranged opposite each other, thereby forming a guiding magnetic field whose magnetic field lines extend along the length direction. Again... Figure 1 , Figure 2 and Figure 4For example, the N pole of the left magnet 81 can be opposite to the S pole of the right magnet 81, thereby forming a guiding magnetic field with the magnetic induction line direction extending from left to right; conversely, the S pole of the left magnet 81 can also be opposite to the N pole of the right magnet 81, thereby forming a guiding magnetic field with the magnetic induction line direction extending from right to left. Thus, a Lorentz force in the front-back direction can be exerted on the two arcs by the guiding magnetic field formed between the two magnets 81 (since the magnetic induction lines between the two magnets are uniformly distributed straight lines, according to the left-hand rule, the two arcs can be subjected to a Lorentz force in the front-back direction). The present invention does not limit the specific direction of the guiding magnetic field above, as long as it extends along the length direction. Regardless of the direction of the current, a Lorentz force in the front-back direction can be exerted on the two arcs, and since the arc extinguishing grid 71 surrounds the moving contact and the static contact, the arc can be deflected to the arc extinguishing grid 71 by the Lorentz force in the front-back direction. That is, the non-polarity of the contactor can be achieved. When connecting the contactor to the circuit system, regardless of how the positive and negative poles of the contactor and the circuit system are connected, the arc extinguishing of the contactor can be achieved. That is, when connecting the contactor, there is no need to confirm the correspondence between the positive and negative poles of the contactor and the positive and negative poles of the circuit system, which can simplify the connection steps of the contactor and the circuit system.

[0066] In a specific embodiment, the arc ignition mechanism 8 further includes two "C"-shaped magnetic conduction frames 82 that match the shapes of the arc extinguishing mechanism (i.e., the arc extinguishing grid and the arc extinguishing net). The magnetic conduction frame 82 is composed of a base plate 821 and side plates 822 extending from both ends of the base plate 821 in the same direction. The two magnetic conduction frames 82 are arranged oppositely, thereby forming a square frame surrounding the two arc extinguishing grids 71, the moving contact 5, and the static contacts 41 of the two static contacts 4. The two magnets 81 are respectively adhered to the base plates 821 of the two magnetic conduction frames 82. The magnetic conduction frame 82, as a magnetic yoke, distributes the guiding magnetic field of the magnet 81 along the magnetic conduction frame 82, which can enhance the magnetic field intensity of the guiding magnetic field, and further increase the arc deflection ability of the magnetic field and improve the arc extinguishing efficiency.

[0067] Further, as Figures 1 to 5 shown, two side grooves 114 are also provided on the side wall of the upper housing 11. The side grooves 114 extend along the axial direction of the housing 1 and are formed into a "C" shape that matches the shape of the magnetic conduction frame 82 and surrounds the first chamber 111. The magnet 81 and the magnetic conduction frame 82 of the arc ignition mechanism 8 are accommodated in the side grooves 114. Of course, the magnet 81 and the magnetic conduction frame 82 can also be provided in the first chamber 111, or provided outside the housing 1, or even not provided on the contactor. As long as a guiding magnetic field can be provided for the arc, the present invention does not limit the position of the arc ignition mechanism. Being provided in the side groove is only for the convenience of assembly and to ensure the structural integration of the contactor.

[0068] Preferably, the height of the magnet 81 and the magnetic conduction frame 82 is greater than or equal to the height of the arc extinguishing grid 71. Thus, the guiding magnetic field generated by the magnet 81 completely covers the arc, so as to reliably deflect the arc.

[0069] In one specific embodiment, the plurality of grid plates 710 include an uppermost top-layer grid plate 7101 and a plurality of lower-layer grid plates 7102 located below the top-layer grid plate 7101. The stationary contact 41 of the stationary contact 4 is fixed in contact with the top-layer grid plate 7101, so that the top-layer grid plate 7101, which serves as the uppermost grid plate of the arc-extinguishing grid 7, and the stationary contact 4 form an equipotential connection. Thus, through the above structure and under the magnetic blowing action of the arc-initiating mechanism 8, the arc root can be rapidly moved to the top-layer grid plate 7101 of the arc-extinguishing grid 7, thereby elongating the arc and contacting the remaining lower-layer grid plates 7102, thus cutting the long arc into multiple short arc segments. The equipotential connection between the stationary contact 4 and the top-layer grid plate 7101 accelerates the movement speed of the arc, thereby improving the arc-extinguishing efficiency of the contactor.

[0070] Furthermore, one side of the top-layer grid plate 7101 has a fitting groove with a diameter equal to that of the stationary contact 41. The stationary contact 41 is embedded in the fitting groove, thereby contacting the top-layer grid plate 7101 to form an equipotential connection. In addition, a downwardly folded connecting flange 71011 is provided on the side of the fitting groove. The stationary contact 41 abuts and is fixed to the connecting flange 71011, thereby increasing the contact area between the stationary contact 41 and the top-layer grid plate 7101 and improving the connection stability.

[0071] In one specific embodiment, the edges at both ends of the moving contact 5 are formed with downward-folded arc-inducing angles 52. When the arc deflects towards the arc-extinguishing grid 7, the arc root of the arc at the moving contact end moves downward, thereby lengthening the arc and allowing it to contact more grid plates, improving the utilization rate of the arc-extinguishing grid. Simultaneously, the arc-inducing angle shortens the distance from the arc root to the arc-extinguishing grid, allowing the arc to move to the grid more quickly, further improving the arc-extinguishing efficiency of the contactor. Furthermore, the arc-inducing angle 52 also extends the contact life of the moving contact and prevents arc erosion at the contact point.

[0072] Furthermore, the figure shows that the drive mechanism 3 controls the connection and disconnection of one moving contact 5 and a pair of stationary contacts 4, but the drive mechanism 3 can also simultaneously control the connection and disconnection of multiple pairs of stationary contacts 4 and multiple moving contacts 5. For example, multiple pairs of stationary contacts 4 and multiple moving contacts 5 can be arranged in the vertical direction, and the push rod 36 of the drive mechanism 3 can connect multiple moving contacts 5, thereby simultaneously controlling the on / off state of multiple circuits. Correspondingly, multiple arc-extinguishing mechanisms and arc-initiating mechanisms are also provided.

[0073] Another embodiment of the present invention provides a circuit system including the contactor in any of the above embodiments.

[0074] The solution of this application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

[0075] Throughout this specification, the terms "an embodiment," "embodiment," or "specific embodiment" refer to a particular feature, structure, or characteristic described in connection with an embodiment that is included in at least one embodiment of this application, but not necessarily in all embodiments. Therefore, the various representations of the phrases "in one embodiment," "in an embodiment," or "in a specific embodiment" in different places throughout this specification do not necessarily refer to the same embodiment. Furthermore, a particular feature, structure, or characteristic of any specific embodiment of this 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 described and illustrated herein may be based on the teachings herein and will be considered part of the spirit and scope of this application.

[0076] It should also be understood that one or more of the elements shown in the figures may be implemented in a more separate or more integrated manner, or may even be removed because they are inoperable in certain circumstances or provided because they may be useful for a particular application.

[0077] Furthermore, unless otherwise expressly stated, any arrows in the accompanying drawings should be considered illustrative only and not limiting. Additionally, unless otherwise stated, the term "or" as used herein is generally intended to mean "and / or". Where a term is anticipated to provide a separation or combination capability that is unclear, a combination of components or steps will also be considered as indicated.

Claims

1. A contactor, characterized in that, include: A housing, wherein an arc-extinguishing cavity is provided inside the housing; Two stationary contacts are arranged opposite each other. Each stationary contact includes a stationary contact portion and a connecting portion. The stationary contact portion is located inside the arc-extinguishing cavity, and the connecting portion is located outside the housing for connection with external equipment. The moving contact located in the arc-extinguishing cavity has moving contact portions at both ends. The moving contact portions can detachably contact the stationary contact portions of the two stationary contacts to disconnect or connect the two stationary contacts. An arc-extinguishing grid surrounds the stationary contact portion and the moving contact portion. The arc-extinguishing grid is composed of a top grid plate and multiple lower grid plates stacked together. The top grid plate is equipotentially connected to the stationary contact portion. as well as An arc-initiating mechanism is provided, which generates a guiding magnetic field to deflect the electric arc generated when the moving contact part separates from the stationary contact part to the arc-extinguishing grid for extinguishing.

2. The contactor according to claim 1, characterized in that, The edge of the moving contact is provided with a downward-folded arc-inducing angle, which is used to lengthen the electric arc and shorten the distance from the electric arc to the arc-extinguishing grid.

3. The contactor according to claim 1, characterized in that, The arc-extinguishing chamber is further provided with: an arc-extinguishing mesh surrounding the arc-extinguishing grid; and / or a solid gas-generating material for generating gas to cool the electric arc.

4. The contactor according to claim 1, characterized in that, One side of the top layer grid plate has a connecting flange, and the stationary contact part is fixedly connected to the connecting flange.

5. The contactor according to claim 1, characterized in that, The arc-extinguishing grid also includes a fixing plate, and the top grid plate and the plurality of lower grid plates are stacked and fixed to the fixing plate.

6. The contactor according to claim 1, characterized in that, The arc-initiating mechanism includes two magnets arranged opposite each other, with opposite magnetic poles facing each other. The stationary contact portion and the moving contact portion are located between the two magnets. The guiding magnetic field formed between the two magnets applies a Lorentz force toward the arc-extinguishing grid to the electric arc.

7. The contactor according to claim 6, characterized in that, The arc-initiating mechanism also includes two magnetic guide frames, which are used to enhance the magnetic field strength of the guiding magnetic field.

8. The contactor according to claim 7, characterized in that, The side wall of the housing is provided with a side groove surrounding the arc-extinguishing cavity, and the magnet and the magnetic guide frame are embedded in the side groove.

9. The contactor according to any one of claims 1-8, characterized in that, The housing includes an upper housing and a lower housing. The upper housing contains the arc-extinguishing cavity, and the lower housing contains a driving mechanism for driving the moving contact to separate and contact with the stationary contact.

10. A circuit system, characterized in that, Includes the contactor as described in any one of claims 1-9.

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