Switching device

Abstract

A switching device includes a housing, and a contact system and two sets of electromagnetic systems which are respectively arranged in the housing, wherein the two sets of electromagnetic systems are oppositely arranged on both sides of the contact system, and each set of electromagnetic systems includes an upper armature and a coil for driving the upper armature to move; the upper armatures of the two sets of electromagnetic systems are connected by means of a linkage shaft; the contact system includes static contacts and moving contacts that are arranged on a contact support; the linkage shaft is connected to the contact support; and the two sets of electromagnetic systems respectively drive the contact support to move by means of the linkage shaft, so that the contact support drives the moving contacts to be in contact with or separated from the static contacts, which can not only achieve a large driving force, a fast action response and good balance, but can reduce the height of the switching device.

Description

[0001] The present application claims priority to Chinese Patent Application CN202311416225.0 filed on October 30, 2023, which is incorporated herein by reference in its entirety.TECHNICAL FIELD

[0002] The present invention relates to the field of low-voltage electrical appliances, and more particularly, to a switching device.BACKGROUND

[0003] Existing contactors are often used to control lines, but an electromagnetic system and a main circuit of the existing contactors are distributed up and down, resulting in increased product height, and if the height is too large, leading to the inability to install contactors in some places. In addition, the contactors do not have a function of overload and short-circuit protection, and with the emergence of some new industries and new formats, have some new needs for low-voltage switching devices. The contactor products are required to have both the advantages of long service life and high operating frequency, as well as some protective functions, which cannot be achieved by the existing traditional contactor products.SUMMARY

[0004] An object of the present invention is to break through some limitations in the prior art and provide a switching device.

[0005] In order to fulfill the above object, the present invention adopts the following technical solutions.

[0006] A switching device includes a housing, and a contact system and two sets of electromagnetic systems which are respectively arranged in the housing, wherein the two sets of electromagnetic systems are oppositely arranged on both sides of the contact system, and each set of electromagnetic systems includes an upper armature and a coil for driving the upper armature to move; the upper armatures of the two sets of electromagnetic systems are connected by means of a linkage shaft; the contact system includes static contacts and moving contacts that are arranged on a contact support; the linkage shaft is connected to the contact support; and the two sets of electromagnetic systems respectively drive the contact support to move by means of the linkage shaft, so that the contact support drives the moving contacts to be in contact with or separated from the static contacts.

[0007] Optionally, the two sets of electromagnetic systems are oppositely arranged on both sides of the contact support in a first direction, and the coil is used to drive the upper armature to move in a second direction, and to drive the contact support to move in the second direction; a wire inlet end and a wire outlet end of the contact system are arranged along a third direction; and the first direction, the second direction and the third direction are arranged orthogonally and perpendicular to each other.

[0008] Optionally, two static contacts which serve as the wire inlet end and the wire outlet end respectively are arranged on both sides of the contact support, respectively; the two static contacts are arranged in the third direction; and the contact support is used to drive the moving contacts to be in contact with and separated from the static contacts at both ends at the same time.

[0009] Optionally, a circuit board which is connected to two sets of electromagnetic systems is arranged in the housing; the circuit board is provided with a control unit and a current acquisition circuit, wherein the control unit is connected to the electromagnetic systems so as to drive the electromagnetic systems to operate; and the control unit is connected to the current acquisition circuit so as to acquire a current of a main circuit, and the electromagnetic systems are driven to operate when an overload or short-circuit fault occurs, so that the electromagnetic systems drive the moving contacts to be separated from the static contacts.

[0010] Optionally, the circuit board is provided with a voltage acquisition circuit; the control unit is connected to the voltage acquisition circuit so as to acquire a voltage of the main circuit, and the electromagnetic systems are driven to operate when an overvoltage or undervoltage fault occurs, so that the electromagnetic systems drive the moving contacts to be separated from the static contacts; and / or, the circuit board comprises a quick release circuit connected to the coil of the electromagnetic system for eliminating a residual current in the coil.

[0011] Optionally, the housing includes a base and an arc-extinguishing cover arranged on the top side of the base; an upper cover is arranged above the arc-extinguishing cover; the contact system is arranged inside the arc-extinguishing cover and the base; an arc-extinguishing mechanism is arranged in the arc-extinguishing cover; two protruding boss structures are arranged on the top side of the base; and a groove structure for accommodating the electromagnetic system is arranged in the middle of each of the two boss structures.

[0012] Optionally, the groove structure is provided with a notch close to a side wall of the housing, and the housing is provided with a side cover corresponding to the notch.

[0013] Optionally, two edge covers which cover the two boss structures respectively are arranged on the top side of the base; the two boss structures are oppositely arranged on both sides of the arc-extinguishing cover; and the height of the boss structure is less than that of the arc-extinguishing cover.

[0014] Optionally, a bottom cover is arranged at the bottom side of the base; and a reaction spring connected to the contact support is arranged between the base and the bottom cover.

[0015] Optionally, two circuit boards are arranged in the housing; the two circuit boards are connected to the coils of two sets of electromagnetic systems.

[0016] Optionally, the bottom cover is arranged at the bottom side of the base; and the two circuit boards are respectively located below the corresponding electromagnetic systems, and are arranged between the base and the bottom cover.

[0017] Optionally, two sets of wiring mechanisms, which correspond to each set of electromagnetic systems, are arranged on the boss structures of the housing; each set of wiring structures comprises two sets of contact terminals which are connected to the circuit boards; and the contact terminals are used to connect the control circuits of the corresponding electromagnetic systems.

[0018] Optionally, two sidewalls of the housing in a first direction are respectively provided with contact terminals which are used to connect control circuits of the corresponding electromagnetic systems.

[0019] Optionally, the contact system is provided with a plurality of supporting structures; the moving contacts are arranged on the plurality of supporting structures, respectively; the plurality of supporting structures are sequentially arranged along a length direction of the linkage shaft; the arc-extinguishing cover is provided with a partition plate which is correspondingly arranged between two adjacent supporting structures; the partition plate is provided with a linkage groove for avoiding the linkage shaft on a side edge close to the base; and the linkage shaft passes through the plurality of supporting structures in sequence.

[0020] Optionally, arc-extinguishing structures are respectively arranged at both ends of the moving contacts in a third direction, and each arc-extinguishing structure includes a plurality of arc-extinguishing grids which are arranged at intervals.

[0021] Optionally, arc striking sheets and arc separating sheets are respectively arranged at both ends of the moving contacts in the third direction; the corresponding arc-extinguishing structures are located between the arc striking sheets and the arc separating sheets; the arc striking sheet is located on a side of the arc-extinguishing structure close to the moving contact; the arc striking sheet is located on a side of the arc-extinguishing structure away from the moving contact; the arc striking sheets are used for guiding electric arcs to the arc-extinguishing structures; and the arc striking sheets are used for separating the electric arcs to play an arc-extinguishing role.

[0022] Optionally, a contact spring and a pressing structure connected to the contact spring are arranged in the contact support; the pressing structure extends to the outside of the contact support for pushing the moving contact; the contact spring drives the moving contact to be pressed against and in limiting fit with the outer side of the contact support through the pressing structure; when the contact support drives the moving contacts to be in contact with the static contacts, the moving contacts are pressed against and in limiting fit with the static contacts; the contact support moves and compresses the contact spring; and the contact spring drives the moving contacts to be pressed against and in limiting fit with the static contacts by means of the pressing structure.

[0023] Optionally, the contact support comprises two first side plates arranged oppositely, and two second side plates connected between the two first side plates; the two first side plates are connected to the two second side plates through a top plate; a supporting space for accommodating the pressing structure and the contact spring is defined among the two first side plates, the two second side plates and the top plate; the contact support further comprises a cover plate opposite to the top plate; the cover plate is used to cover an opening position of the supporting space; the two first side plates and the top plate are respectively provided with first supporting holes and second supporting holes which allow the linkage shaft to pass through; the linkage shaft is used to drive the contact support to move after penetrating through the first side plates and the top plate from the first supporting hole and the second supporting hole respectively; supporting plates are arranged on side surfaces of the two second side plates which are away from each other, respectively; the supporting plates are connected to a reaction spring; the pressing structure is of a U-shaped structure; the pressing structure comprises two spring bracket side edges arranged oppositely, and a spring bracket bottom connected between the two spring bracket side edges; the contact spring is arranged between the spring bracket bottom and the inner surface of the top plate, and is abutted against both the spring bracket bottom and the inner surface of the top plate; the two first side plates are respectively arranged higher than the top plate; sliding grooves are provided on opposite side surfaces of the two first side plates, respectively; the two spring bracket side edges are located in and in sliding fit within the sliding grooves, respectively; one ends of the two spring bracket side edges away from the spring bracket bottom extend to the outside of the top plate from the sliding grooves, respectively; the two spring bracket side edges are located at the outer end of the top plate and are respectively connected to a pressure rod; the moving contact is arranged between the pressure rod and the outer side of the top plate; the pressure rod is used to press the moving contact against and be in limiting fit with the top plate; a limiting boss matching the pressure rod is arranged on the moving contact; the two spring bracket side edges are respectively provided with avoidance holes that allow the linkage shaft to pass through; the avoidance hole is in the shape of a long strip, and a length direction of the avoidance hole is parallel to a movement direction of the contact support.

[0024] Optionally, the electromagnetic system comprises an upper armature and a fixed lower armature; the coil is arranged between the upper armature and the lower armature; and the coil is used to generate an electromagnetic force to drive the upper armature to move toward the lower armature.

[0025] Optionally, the electromagnetic system includes a U-shaped lower armature, and a coil skeleton arranged inside the lower armature; the coil is arranged outside the coil skeleton; the upper armature is T-shaped; the upper armature includes a first linkage portion and a second linkage portion connected to the middle of the first linkage portion; a linkage hole is provided at the connection between the first linkage portion and the second linkage portion; both ends of the linkage shaft are inserted into the linkage holes of the upper armatures of the two electromagnetic systems, such that the two upper armatures can drive the linkage shaft to move; the second linkage portion is inserted into the coil skeleton; the lower armature is used to attract the second linkage portion, such that the second linkage portion drives the upper armature to move; and both ends of the first linkage portion are respectively connected to a reset spring, and the reset spring is used to drive the upper armature to reset.

[0026] According to the switching device of the present invention, since the two sets of electromagnetic systems are oppositely arranged on both sides of the contact system, the two sets of electromagnetic systems synchronously drive the contact support to reciprocate up and down, such that the contact support drives the moving contacts to be in contact with and separated from the static contacts, which not only achieves a large driving force and fast action response, but can drive a set or more sets of moving contacts. In addition, the two sets of electromagnetic systems exert driving forces from both sides to ensure the balance, especially the electromagnetic systems are located on a lateral side of the contact system. The electromagnetic systems and the contact system occupy a space of the same height, avoiding the electromagnetic systems and the contact system from being arranged along a longitudinal direction, which can reduce the height of the switching device, such that the switching device in the present embodiment can be used in a position where a contactor cannot be installed at the original height.

[0027] In addition, the switching device of the present invention has both long electrical life and mechanical life, and convenient remote control of the contactor, and also additionally provides a short-circuit breaking protection function of a circuit breaker and a thermal overload protection function of a thermal overload relay, providing a new choice for a user.BRIEF DESCRIPTION OF THE DRAWINGS

[0028] FIG. 1 is a schematic structural diagram of a switching device of the present invention; FIG. 2 is an exploded view of the switching device of the present invention; FIG. 3 is a schematic diagram of cooperation between an electromagnetic system and a contact support in the present invention; FIG. 4 is a schematic structural diagram of an arc-extinguishing cover in the present invention; FIG. 5 is a sectional view of the switching device of the present invention; FIG. 6 is another sectional view and an enlarged view of the switching device of the present invention; and FIG. 7 is a schematic structure diagram of a linkage shaft, a pressing structure and a moving contact in the present invention.

[0029] Reference symbols represent the following components: 1-contact system; 2-electromagnetic system; 21-upper armature; 22-coil; 20-linkage shaft; 3-static contact; 4-contact support; 5-moving contact; 61-base; 62-arc-extinguishing cover; 63-upper cover; 64-boss structure; 65-edge cover; 66-groove structure; 67-side cover; 68-bottom cover; 7-reaction spring; 23-circuit board; 24-sensor; 27-contact terminal; 621-partition plate; 622-linkage groove; 81-arc striking sheet; 82-arc separating sheet; 83-arc-extinguishing structure; 40-contact spring; 41-first side plate; 42-second side plate; 43-top plate; 44-cover plate; 46-supporting plate; 9-pressing structure; 91-spring bracket side edge; 92-spring bracket bottom; 47-sliding groove; 93-pressure rod; 94-avoidance hole; 95-limiting boss; 25-lower armature; 26-coil skeleton; 211-first linkage portion; 212-second linkage portion; 213-linkage hole; and 214-positioning member.DETAILED DESCRIPTION

[0030] The specific implementation of a switching device of the present invention will be further described below in conjunction with the embodiments given in accompanying drawings. The switching device of the present invention is not limited to the description of the following embodiments.

[0031] As shown in FIGS. 1 to 6, a switching device in the present embodiment includes a housing, and a contact system 1 and two sets of electromagnetic systems 2 which are respectively arranged in the housing, wherein the two sets of electromagnetic systems 2 are oppositely arranged on both sides of the contact system 1, and each set of electromagnetic systems 2 includes an upper armature 21 and a coil 22 for driving the upper armature 21 to move; the upper armatures 21 of the two sets of electromagnetic systems 2 are connected by means of a linkage shaft 20; the contact system 1 includes static contacts 3 and moving contacts 5 that are arranged on a contact support 4; the linkage shaft 20 is connected to the contact support 4; and the two sets of electromagnetic systems 2 drive the contact support 4 to move by means of the linkage shaft 20, so that the contact support 4 drives the moving contacts 5 to be in contact with or separated from the static contacts 3.

[0032] According to the switching device in the present embodiment, since the two sets of electromagnetic systems 2 are oppositely arranged on both sides of the contact system 1, the two sets of electromagnetic systems 2 synchronously drive the contact support 4 to reciprocate up and down, such that the contacts support 4 drives the moving contacts 5 to be in contact with and separated from the static contacts 3, which not only achieves a large driving force to drive one or more sets of moving contacts 5. In addition, the two sets of electromagnetic systems 2 exert driving forces from both sides to ensure the balance, especially the electromagnetic systems 2 are located on a lateral side of the contact system 1. The electromagnetic systems 2 and the contact system 1 occupy a space of the same height, avoiding the electromagnetic systems 2 and the contact system 1 from being arranged along a longitudinal direction, which can reduce the height of the switching device, such that the switching device in the present embodiment can be used in a position where a contactor cannot be installed at the original height.

[0033] As shown in FIGS. 1 to 6, the two sets of electromagnetic systems 2 are oppositely arranged on both sides of the contact support 4 in a first direction, and the coil 22 is used to drive the upper armature 21 to move in a second direction, and to drive the contact support 4 to move in the second direction. A wire inlet end and a wire outlet end of the contact system 1 are arranged along a third direction. The first direction, the second direction and the third direction are arranged orthogonally and perpendicular to each other, such that the mechanism in the housing has a reasonable layout, compact structure and small size. Referring to FIG. 1, the first direction is a width direction of the switching device, the second direction is a height direction of the switching device, and the third direction may be a length direction of the switching device for wiring at both ends of the switching device in the length direction.

[0034] Further, two static contacts 3 which serve as the wire inlet end and the wire outlet end respectively are arranged on both sides of the contact support 4, respectively; the two static contacts 3 are arranged in the third direction; both ends of the moving contact 5 extend out of the contact support 4 in the third direction; and the contact support 4 is used to drive the moving contacts 5 to be in contact with and separated from the static contacts 3 at both ends at the same time, which can further achieve a reasonable layout. In the present embodiment, the two static contacts 3 are arranged as a whole with the wire inlet end and the wire outlet end, respectively. That is, as shown in FIG. 1 and FIG. 5, a static contact point which matches the moving contact is arranged at one end of the static contact 3, and the other end of the static contact 3 extends out of the housing and serves as the wire inlet end or the wire outlet end for connection with a power supply. Of course, as other embodiments, the two static contacts 3 may also be arranged separately from the wire inlet end and the wire outlet end. That is, the static contacts 3 are arranged separately from wiring plates which serve as the wire inlet end and the wire outlet end. The static contacts 3 and the wiring plates are connected by means of welding or riveting or by screws, and may also be connected indirectly through conductors.

[0035] As shown in FIGS. 1 to 2, the housing includes a base 61 and an arc-extinguishing cover 62 arranged on the top side of the base 61; an upper cover 63 is arranged above the arc-extinguishing cover 62; the contact system 1 is arranged inside the arc-extinguishing cover 62 and the base 61; an arc-extinguishing mechanism is arranged in the arc-extinguishing cover 62; two protruding boss structures 64 are arranged on the top side of the base 61; a groove structure 66 for accommodating the electromagnetic systems 2 is arranged in the middle of each of the two boss structures 64; and the electromagnetic systems 2 are installed in the groove structure 66. Preferably, the groove structure 66 is provided with a notch at a side wall close to the housing. The housing is provided with a side cover 67 corresponding to the notch, which is used to protect the electromagnetic systems 2, and is also convenient for the replacement of the electromagnetic systems 2. In the present embodiment, the side cover 67 is in an L shape which corresponds to the notches on the top and the side surface of the groove structure 66, and of course, may also be of other structures. Further, two edge covers 65 which cover the two boss structures 64 respectively are arranged on the top side of the base 61; the two boss structures 64 are oppositely arranged on both sides of the arc-extinguishing cover 62; and the height of the boss structure 64 is less than that of the arc-extinguishing cover 62, such that the internal space can be utilized more reasonably. Of course, the height of the boss structure 64 may also be greater than or equal to that of the arc-extinguishing cover 62. A bottom cover 68 is arranged at the bottom side of the base 61, and a reaction spring 7 which is connected to the contact support 4 is arranged between the base 61 and the bottom cover 68. In the present embodiment, the reaction spring 7 is used to drive the contact support 4 to drive the moving contact 5 to move away from the static contact 3 to form a normally open contact, and the coil 22 is energized by pressing down the contact support 4, such that the moving contact 5 and the static contact 3 are closed; and after the coil 22 is powered off, the reaction spring 7 and the contact spring 40 push the contact support 4, such that the moving contact 5 is separated from the static contact 3. The housing structure in the present embodiment facilitates the installation of the electromagnetic systems 2 and the contact system 1. Obviously, as other embodiments, the housing may only be provided with a base and an upper cover, or a left housing and a right housing, or assembled by more housing structures, all of which belong to the protection scope of the present invention.

[0036] As shown in FIG. 6, circuit boards 23 which are connected to the two sets of electromagnetic systems 2 respectively are arranged in the housing. The circuit boards 23 can make the two sets of electromagnetic system 2 operated. Under short-circuit, overload or other cases, a coil voltage is switched off in time, such that the contact support 4 drives the moving contacts 5 to be in contact with and separated from the static contacts 3, and thus the switching device is powered on and off. Preferably, the circuit board 23 is provided with a control unit, which is capable of implementing overload, and / or short-circuit, and / or undervoltage, and / or overvoltage protection, etc. For example, the circuit board 23 is provided with a control unit and a current acquisition circuit, wherein the control unit is connected to the electromagnetic systems 2 so as to drive the electromagnetic systems 2 to operate; and the control unit is connected to the current acquisition circuit so as to acquire a current of the main circuit to detect an overload or short-circuit fault; and the electromagnetic systems 2 are driven to operate in the presence of an overload or short-circuit fault, so that the electromagnetic systems 2 drive the moving contacts 5 to be separated from the static contacts 3. Further, the circuit board 23 is provided with a voltage acquisition circuit. The control unit is connected to the voltage acquisition circuit so as to acquire a voltage of the main circuit to detect an overvoltage or undervoltage fault; and the electromagnetic systems 2 are driven to operate when an overvoltage or undervoltage fault occurs, so that the electromagnetic systems 2 drive the moving contacts 5 to be separated from the static contacts 3.

[0037] In the present embodiment, the static contact 3 is provided with a sensor 24 connected to the circuit board 23. The circuit board 23 is provided with a control unit, a current acquisition circuit and a voltage acquisition circuit. The current acquisition circuit and the voltage harvesting circuit detect a current and a voltage of the static contact 3 through the sensors 24, respectively. The control unit drives the electromagnetic systems 2 to operate if an overload and short-circuit fault of the current is detected through the current acquisition circuit, so that the electromagnetic systems 2 drive the moving contacts 5 to be separated from the static contacts 3. The control unit drives the electromagnetic systems 2 to operate if an overvoltage fault of the current is detected through the voltage acquisition circuit, so that the electromagnetic systems 2 drive the moving contacts 5 to be separated from the static contacts 3. For example, when the current or voltage on the static contacts 3 exceeds a threshold, the current acquisition circuit and the voltage acquisition circuit respectively output a corresponding fault signal to the circuit board 23, and durations of the fault signals are recorded through the circuit board 23. When the duration of the fault signal meets a threshold, the electromagnetic systems 2 are driven to operate, such that the electromagnetic systems 2 drive the moving contacts 5 to be separated from the static contacts 3. The fault current may be overload, short-circuit, undervoltage and overvoltage currents, or any combination thereof, such that the switching device also has an overload, short-circuit, undervoltage and / or overvoltage protection function on the basis of a control line. Of course, the circuit board 23 may also be arranged in other positions, e.g., a side surface of the electromagnetic system 2. The sensor 24 may also be arranged on a wiring terminal or a moving contact or other conductive element on the main circuit, all of which belong to the protection scope of the present invention. The sensor 24 may be a resistor, a transformer, etc.

[0038] Two sidewalls of the housing in the first direction (i.e., the width direction) are respectively provided with contact terminals 27 which are used to connect the control circuits of the corresponding electromagnetic systems 2. In the present embodiment, two circuit boards 23 are arranged in the housing. The two circuit boards 23 are respectively connected to two sets of electromagnetic systems 2, respectively located below the corresponding electromagnetic systems 2, and arranged between the base 61 and the bottom cover 68. In addition, two sets of wiring mechanisms, which correspond to each set of electromagnetic systems 2, are arranged on the boss structures 64 of the housing. The two sets of wiring mechanisms are oppositely arranged on both sides of the corresponding electromagnetic systems 2, and each wiring structure includes two sets of contact terminals 27 which are connected to the circuit board 23, and the contact terminals 27 are used to connect the control circuits of the corresponding electromagnetic systems 2 to implement the external control over the electromagnetic systems 2.

[0039] Further, the circuit board 23 has an effect of residual current in the coil 22 of the electromagnetic system 2. The circuit board 23 includes a quick release circuit. The coil is an inductive element, which belongs to an energy storage element. There is an induction current inside the coil after power failure. The armature 21 will generate residual magnetism, hindering the release of the armature 21. The quick release circuit is connected to the coil 22 of the electromagnetic system 2 for eliminating the residual current in the coil 22. In the present embodiment, the two circuit boards 23 are respectively provided with the quick release circuits for connection with the coils 22 of the two electromagnetic systems 2. The quick release circuit is used to eliminate the residual current in the coil 22 after the coil 22 is powered off. The quick release circuit includes a resistor and a diode. Quick release circuits in the prior art may also be adopted. Two circuit boards 23 are arranged in the present embodiment. The two circuit boards 23 can control two electromagnetic systems 2 separately, and the two electromagnetic systems 2 can be protected by the corresponding circuit boards 23, respectively. Of course, as other embodiments, one or more circuit boards 23 may also be arranged. One circuit board 23 may be connected to two electromagnetic systems 2 at the same time, or among the plurality of circuit boards 23. The intermediate sensor 24 transmits an electrical signal to all circuit boards 23, and then the circuit boards 23 control their respective electromagnetic systems 2 respectively, which can implement the control over the electromagnetic systems 2 on both sides.

[0040] As shown in FIGS. 3 to 4, a three-phase structure is provided in the present embodiment. The contact support 4 is provided with three supporting structures. Two electromagnetic systems 2 are arranged on both sides of the three supporting structures, respectively. The three supporting structures are arranged in sequence along a length direction of the linkage shaft 20, and the length direction of the linkage shaft 20 is the first direction. The arc-extinguishing cover 62 is provided with a partition plate 621 which is correspondingly arranged between two adjacent supporting structures. The partition plate 621 is provided with a linkage groove 622 for avoiding the linkage shaft 20 on a side edge close to the base 61. The linkage shaft 20 passes through the three supporting structures in sequence, for driving the movement of the three supporting structures at the same time. The three supporting structures are provided with moving contacts 5, respectively. Each supporting structure is provided with two static contacts 3 on the other two sides. The supporting structures drive the moving contacts 5 to be in contact with and separated from the corresponding two static contacts 3 as the supporting structures move. According to the switching device in the present embodiment, the first electromagnetic system 2, the three supporting structures and the second electromagnetic system 2 are sequentially arranged along the length direction of the linkage shaft 20. The moving contact 5 is installed on the supporting structure, and both ends of the moving contact 5 extend out of the supporting structure. The length direction of the moving contact 5 is perpendicular to the length direction of the linkage shaft 20. The static contacts 3 which correspond to both ends of the moving contact 5 are arranged on both sides of each supporting structure, respectively. A connecting line of the two static contacts 3 is perpendicular to the length direction of the linkage shaft 20. It may be understood that the number of supporting structures may also be adjusted, and the number of moving contacts 5 and the number of static contacts 3 may also adjusted according to the number of supporting structures. For example, one or two supporting structures, or more than three supporting structures are provided. The plurality of supporting structures may be formed into the contact support 4 by means of integrated molding; or the plurality of supporting structures are assembled into the contact support 4; or the plurality of supporting structures are connected to the linkage shaft 20, respectively. The plurality of supporting structures are arranged along the length direction of the linkage shaft 20. The two electromagnetic systems 2 may drive the plurality of supporting structures to move at the same time through the linkage shaft 20, and the height of the switching device cannot be increased.

[0041] As shown in FIG. 5, arc-extinguishing mechanisms are respectively arranged at both ends of the moving contact 5, and each arc-extinguishing mechanism includes an arc-extinguishing structure 83. In the present embodiment, the arc-extinguishing cover 62 is provided with arc striking sheets 81 and arc separating sheets 82 which are respectively arranged at both ends of the moving contact 5 in the third direction, and arc-extinguishing structures 83 located between the arc striking sheets 81 and the arc separating sheets 82. The arc-extinguishing structure 83 includes a plurality of arc-extinguishing grids which are arranged at intervals. The arc striking sheets 81 are located on a side of the arc-extinguishing structure 83 close to the moving contact 5. The arc separating sheets 82 are located on a side of the arc-extinguishing structure 83 away from the moving contact 5. The arc striking sheets 81 are used to guide electric arcs to the arc-extinguishing structure 83. The plurality of arc-extinguishing sheets separate the electric arcs to play an arc-extinguishing role. The arc separating sheets 82 are used to separate the electric arcs to play an arc-extinguishing role. The upper cover 63 is used to protect the arc striking sheets 81, the arc separating sheets 82 and the arc-extinguishing structures 83 in the arc-extinguishing cover 62. In the present embodiment, the two arc striking sheets 81 at both ends of each moving contact 5 are connected. Of course, the two arc striking sheets 81 at both ends of each moving contact 5 can also be arranged independently, all of which belong to the protection scope of the present invention.

[0042] As shown in FIGS. 6 to 7, the moving contact 5 is installed on the contact support 4 through the contact spring 40. In one embodiment, the moving contact 5 penetrates through the contact support 4, and the contact spring 40 is arranged on the contact support 4 and acts on the moving contact 5. Preferably, in the present embodiment, the moving contact 5 is arranged on the top of the contact support 4, and fixed by means of the cooperation of a pressing structure 9, the contact spring 40 and the contact support 4. The contact spring 40 and the pressing structure 9 connected to the contact spring 40 are arranged in the contact support 4. The pressing structure 9 extends to the outside of the contact support 4 for pushing the moving contact 5. The contact spring 40 drives the moving contact 5 to be pressed against and in limiting fit with the outer side of the contact support 4 through the pressing structure 9. When the contact support 4 drives the moving contact 5 to be in contact with the static contact 3, the moving contact 5 is pressed against and in limiting fit with the static contact 3. The contact supports 4 moves and compresses the contact spring 40. The contact spring 40 drives the moving contact 5 to be pressed against and in limiting fit with the static contact 3 by means of the pressing structure 9, thereby increasing a contact pressure between the static contact 3 and the moving contact 5. The pressing structure 9 is provided with an avoidance hole for avoiding the linkage shaft 20. Of course, as other embodiments, the pressing structure 9 may also not be provided. For example, a shaft sleeve (not shown) is arranged on the linkage shaft 20, and the linkage shaft 20 drives the shaft sleeve to press against the moving contact 5, such that the moving contact 5 is pressed against the contact support 4, all of which fall within the protection scope of the present invention.

[0043] Specifically, the supporting structure of the contact support 4 is of a hollow tetrahedral structure, including two first side plates 41 arranged oppositely, and two second side plates 42 connected between the two first side plates 41. The first side plates 41 are used to separate each phase. The two first side plates 41 are connected to the two second side plates 42 through a top plate 43. A supporting space for accommodating the pressing structure 9 and the contact spring 40 is defined among the two first side plates 41, the two second side plates 42 and the top plate 43. The supporting structure further includes a cover plate 44 opposite to the top plate 43. The cover plate 44 is used to cover an opening position of the supporting space. The two first side plates 41 and the top plate 43 are respectively provided with first supporting holes and second supporting holes which allow the linkage shaft 20 to pass through. The linkage shaft 20 is used to drive the contact support 4 to move after penetrating through the first side plates 41 and the top plate 43 from the first supporting holes and the second supporting holes respectively. Supporting plates 46 (see FIG. 3) are arranged on side surfaces of the two second side plates 42 which are away from each other, respectively. The supporting plates 46 are connected to the reaction spring 7. The pressing structure 9 is of a U-shaped structure. The pressing structure 9 includes two spring bracket side edges 91 arranged oppositely, and a spring bracket bottom 92 connected between the two spring bracket side edges 91. The contact spring 40 is arranged between the spring bracket bottom 92 and the inner surface of the top plate 43, and is abutted against both the spring bracket bottom 92 and the inner surface of the top plate 43. The two first side plates 41 are respectively arranged higher than the top plate 43. Sliding grooves 47 are provided on opposite side surfaces of the two first side plates 41, respectively. The two spring bracket side edges 91 are located in and in sliding fit within the sliding grooves 47, respectively. One ends of the two spring bracket side edges 91 away from the spring bracket bottom 92 extend to the outside of the top plate 42 from the sliding grooves 47, respectively. The two spring bracket side edges 91 are located at the outer end of the top plate 43 and are respectively connected to a pressure rod 93. The moving contact 5 is arranged between the pressure rod 93 and the outer side of the top plate 43. The pressure rod 93 is used to press the moving contact 5 against and be in limiting fit with the top plate 43. A limiting boss 95 matching the pressure rod 93 is arranged on the moving contact 5. The two spring bracket side edges 91 are respectively provided with avoidance holes 94 that allow the linkage shaft 20 to pass through. The avoidance hole 94 is in the shape of a long strip, and a length direction of the avoidance hole 94 is parallel to a movement direction of the contact support 4. Of course, the pressing structure 9 may also be in other shapes, all of which fall within the protection scope of the present invention. For example, the linkage shaft 20 passes through the first supporting holes on the two first side plates 41 and passes through from above the pressure rod 93, and it is also possible not to provide avoidance holes 94 on the two spring bracket side edges 91.

[0044] As shown in FIG. 3, the electromagnetic system 2 includes an upper armature 21 and a fixed lower armature 25, the coil 22 is arranged between the upper armature 21 and the lower armature 25, and the coil 22 is used to generate an electromagnetic force to drive the upper armature 21 to move toward the lower armature 25. In the present embodiment, the electromagnetic system 2 includes a U-shaped lower armature 25, and a coil skeleton 26 arranged inside the lower armature 25; the coil 22 is arranged outside the coil skeleton 26; the upper armature 21 is T-shaped; the upper armature 21 includes a first linkage portion 211 and a second linkage portion 212 connected to the middle of the first linkage portion 211; a linkage hole 213 is provided at the connection between the first linkage portion 211 and the second linkage portion 212; both ends of the linkage shaft 20 are respectively inserted into the linkage holes 213 of the upper armatures 21 of the two electromagnetic systems 2, such that the two upper armatures 21 can drive the linkage shaft 20 to move; the second linkage portion 212 is inserted into the coil skeleton 26; the lower armature 25 is used to attract the second linkage portion 212, such that the second linkage portion 212 drives the upper armature 21 to move; positioning members 214 are arranged on both ends of the first linkage portion 211; the positioning members 214 are connected to a reset spring (not shown); and the reset spring is used to drive the upper armatures 21 to reset. The upper armature 21 of the T-shaped structure can maintain the balance through the first linkage portion 211 while being connected to the linkage shaft 20, ensuring reliable attraction with the coil 22 through the second linkage portion 212 and achieving the characteristics of compact structure and small size. Of course, the electromagnetic system 2 can also attract the upper armatures 21 to move by using other existing technologies, and the shapes of the upper armatures 21 and the lower armatures 25 can also be adjusted. For example, the upper armature 21 or the lower armature 25 is in an inverted T-shape, a U-shaped, a sideways E-shape, etc., all of which belong to the protection scope of the present invention.

[0045] It should be explained that, in the description of the present invention, the terms such as "up", "down", "left", "right", "inner" and "outer" indicating the directional or positional relations on the basis of the directional or positional relations shown in the drawings are only used for conveniently describing the present invention and simplifying the description, not indicate or imply that the referred devices or elements must have a specific orientation and be configured and operated in a specific direction; therefore, they cannot be construed as a limitation on the present invention.

[0046] We have made further detailed description of the present invention mentioned above in combination with specific preferred embodiments, but it is not deemed that the specific embodiments of the present invention is only limited to these descriptions. A person skilled in the art can also, without departing from the concept of the present invention, make several simple deductions or substitutions, which all be deemed to fall within the protection scope of the present invention.

Claims

1. A switching device, comprising a housing, and a contact system (1) and two sets of electromagnetic systems (2) which are respectively arranged in the housing, wherein the two sets of electromagnetic systems (2) are oppositely arranged on both sides of the contact system (1), and each set of electromagnetic systems (2) comprises an upper armature (21) and a coil (22) for driving the upper armature (21) to move; the upper armatures (21) of the two sets of electromagnetic systems (2) are connected by means of a linkage shaft (20); the contact system (1) comprises static contacts (3) and moving contacts (5) that are arranged on a contact support (4); the linkage shaft (20) is connected to the contact support (4); and the two sets of electromagnetic systems (2) respectively drive the moving contacts (5) and the contact support (4) to move by means of the linkage shaft (20), so that the contact support (4) drives the moving contacts (5) to be in contact with or separated from the static contacts (3).

2. The switching device according to claim 1, wherein the two sets of electromagnetic systems (2) are oppositely arranged on both sides of the contact support (4) in a first direction, and the coil (22) is used to drive the upper armature (21) to move in a second direction, and to drive the contact support (4) to move in the second direction; a wire inlet end and a wire outlet end of the contact system (1) are arranged along a third direction; and the first direction, the second direction and the third direction are arranged orthogonally and perpendicular to each other.

3. The switching device according to claim 2, wherein two static contacts (3) which serve as the wire inlet end and the wire outlet end respectively are arranged on both sides of the contact support (4), respectively; the two static contacts (3) are arranged in the third direction; and the contact support (4) is used to drive the moving contacts (5) to be in contact with and separated from the static contacts (3) at both ends at the same time.

4. The switching device according to claim 1, wherein a circuit board (23) which is connected to two sets of electromagnetic systems (2) is arranged in the housing; the circuit board (23) is provided with a control unit and a current acquisition circuit, wherein the control unit is connected to the electromagnetic systems (2) so as to drive the electromagnetic systems (2) to operate; and the control unit is connected to the current acquisition circuit so as to acquire a current of a main circuit, and the electromagnetic systems (2) are driven to operate when an overload or short-circuit fault occurs, so that the electromagnetic systems (2) drive the moving contacts (5) to be separated from the static contacts (3).

5. The switching device according to claim 4, wherein the circuit board (23) is provided with a voltage acquisition circuit; the control unit is connected to the voltage acquisition circuit so as to acquire a voltage of the main circuit, and the electromagnetic systems (2) are driven to operate when an overvoltage or undervoltage fault occurs, so that the electromagnetic systems (2) drive the moving contacts (5) to be separated from the static contacts (3); and / or, the circuit board (23) comprises a quick release circuit connected to the coil (22) of the electromagnetic system (2) for eliminating a residual current in the coil (22).

6. The switching device according to claim 1, wherein the housing comprises a base (61) and an arc-extinguishing cover (62) arranged on the top side of the base (61); an upper cover (63) is provided above the arc-extinguishing cover (62); the contact system (1) is arranged inside the arc-extinguishing cover (62) and the base (61); an arc-extinguishing mechanism is arranged in the arc-extinguishing cover (62); two protruding boss structures (64) are arranged on the top side of the base (61); and a groove structure (66) for accommodating the electromagnetic systems (2) is arranged in the middle of each of the two boss structures (64).

7. The switching device according to claim 6, wherein the groove structure (66) is provided with a notch at a side wall close to the housing, and the housing is provided with a side cover (67) corresponding to the notch.

8. The switching device according to claim 6, wherein a bottom cover (68) is arranged at the bottom side of the base (61); and a reaction spring (7) connected to the contact support (4) is arranged between the base (61) and the bottom cover (68).

9. The switching device according to claim 6, wherein two circuit boards (23) are arranged in the housing; the two circuit boards (23) are connected to the coils (22) of two sets of electromagnetic systems (2); the bottom cover (68) is arranged at the bottom side of the base (61); and the two circuit boards (23) are respectively located below the corresponding electromagnetic systems (2), and are arranged between the base (61) and the bottom cover (68).

10. The switching device according to claim 9, wherein two sets of wiring mechanisms, which correspond to each set of electromagnetic systems (2), are arranged on the boss structures (64) of the housing; each set of wiring structures comprises two sets of contact terminals (27) which are connected to the circuit boards (23); and the contact terminals (27) are used to connect the control circuits of the corresponding electromagnetic systems (2).

11. The switching device according to claim 6, wherein the contact system (1) is provided with a plurality of supporting structures; the moving contacts (5) are arranged on the plurality of supporting structures, respectively; the plurality of supporting structures are sequentially arranged along a length direction of the linkage shaft (20); the arc-extinguishing cover (62) is provided with a partition plate (621) which is correspondingly arranged between two adjacent supporting structures; the partition plate (621) is provided with a linkage groove (622) for avoiding the linkage shaft (20) on a side edge close to the base (61); and the linkage shaft (20) passes through the plurality of supporting structures in sequence.

12. The switching device according to claim 2, wherein arc-extinguishing structures (83) are respectively arranged at both ends of the moving contacts (5) in a third direction; each arc-extinguishing structure (83) comprises a plurality of arc-extinguishing grids which are arranged at intervals; arc striking sheets (81) and arc separating sheets (82) are respectively arranged at both ends of the moving contacts (5) in the third direction; the corresponding arc-extinguishing structures (83) are located between the arc striking sheets (81) and the arc separating sheets (82); the arc striking sheet (81) is located on a side of the arc-extinguishing structure (83) close to the moving contact (5); the arc separating sheet (82) is located on a side of the arc-extinguishing structure (83) away from the moving contact (5); the arc striking sheets (81) are used for guiding electric arcs to the arc-extinguishing structures (83); and the arc separating sheets (82) are used for separating the electric arcs.

13. The switching device according to claim 1, wherein a contact spring (40) and a pressing structure (9) connected to the contact spring (40) are arranged in the contact support (4); the pressing structure (9) extends to the outside of the contact support (4) for pushing the moving contact (5); the contact spring (40) drives the moving contact (5) to be pressed against and in limiting fit with the outer side of the contact support (4) through the pressing structure (9); when the contact support (4) drives the moving contacts (5) to be in contact with the static contacts (3), the moving contacts (5) are pressed against and in limiting fit with the static contacts (3); the contact support (4) moves and compresses the contact spring (40); and the contact spring (40) drives the moving contacts (5) to be pressed against and in limiting fit with the static contacts (3) by means of the pressing structure (9).

14. The switching device according to claim 13, wherein the contact support (4) comprises two first side plates (41) arranged oppositely, and two second side plates (42) connected between the two first side plates (41); the two first side plates (41) are connected to the two second side plates (42) through a top plate (43); a supporting space for accommodating the pressing structure (9) and the contact spring (40) is defined among the two first side plates (41), the two second side plates (42) and the top plate (43); the contact support further comprises a cover plate (44) opposite to the top plate (43); the cover plate (44) is used to cover an opening position of the supporting space; the two first side plates (41) and the top plate (43) are respectively provided with first supporting holes and second supporting holes which allow the linkage shaft (20) to pass through; the linkage shaft (20) is used to drive the contact support (4) to move after penetrating through the first side plates (41) and the top plate (43) from the first supporting hole and the second supporting hole respectively; supporting plates (46) are arranged on side surfaces of the two second side plates (42) which are away from each other, respectively; the supporting plates (46) are connected to a reaction spring (7); the pressing structure (9) is of a U-shaped structure; the pressing structure (9) comprises two spring bracket side edges (91) arranged oppositely, and a spring bracket bottom (92) connected between the two spring bracket side edges (91); the contact spring (40) is arranged between the spring bracket bottom (92) and the inner surface of the top plate (43), and is abutted against both the spring bracket bottom (92) and the inner surface of the top plate (43); the two first side plates (41) are respectively arranged higher than the top plate (43); sliding grooves (47) are provided on opposite side surfaces of the two first side plates (41), respectively; the two spring bracket side edges (91) are located in and in sliding fit within the sliding grooves (47), respectively; one ends of the two spring bracket side edges (91) away from the spring bracket bottom (92) extend to the outside of the top plate (42) from the sliding grooves (47), respectively; the two spring bracket side edges (91) are located at the outer end of the top plate (43) and are respectively connected to a pressure rod (93); the moving contact (5) is arranged between the pressure rod (93) and the outer side of the top plate (43); the pressure rod (93) is used to press the moving contact (5) against and be in limiting fit with the top plate (43); a limiting boss (95) matching the pressure rod (93) is arranged on the moving contact (5); the two spring bracket side edges (91) are respectively provided with avoidance holes (94) that allow the linkage shaft (20) to pass through; the avoidance hole (94) is in the shape of a long strip, and a length direction of the avoidance hole (94) is parallel to a movement direction of the contact support (4).

15. The switching device according to claim 1, wherein the electromagnetic system (2) comprises an upper armature (21) and a fixed lower armature (25); the coil (22) is arranged between the upper armature (21) and the lower armature (25); and the coil (22) is used to generate an electromagnetic force to drive the upper armature (21) to move toward the lower armature (25).

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