Active contact piece and switching electric appliance

Abstract

The invention discloses an active contact piece and a switching device, and relates to the technical field of electric power, the active contact piece comprises an active contact piece body, the two end parts of the active contact piece body in a first direction are respectively provided with an active contact, the active contact comprises an upper contact and a lower contact, and the circumferential outer side of the upper contact is a spherical upper arc striking surface; the circumferential outer side of the lower contact is a spherical first lower arc striking surface; a first transition arc striking surface is arranged at the connecting position of the arc isolating groove and the upper contact; second lower arc striking surfaces are arranged on the lower portions of the two end faces, in the first direction, of the active contact piece body, and second transition arc striking surfaces are arranged at the connecting positions of the second lower arc striking surfaces and the first lower arc striking surfaces. According to the active contact piece, the technical problems that the arc striking effect of an arc isolation groove formed between a moving contact and a moving contact piece in an existing relay contact assembly is poor, the time that an electric arc is reserved on the active contact piece is too long, electric corrosion to the moving contact is aggravated, and the electric arc cannot be effectively cut off are solved.

Description

Technical Field

[0001] The present invention relates to the field of electric power technology, in particular to an active contact piece and a switch electrical appliance. Background Art

[0002] In switching electrical appliances such as high-voltage contactors or relays, the arc remains on the plane for too long, aggravating the electro-erosion of the moving contact. If the external magnetic field capacity is insufficient or the magnetic field is weakened, the product cannot effectively cut off the arc, and adverse extreme phenomena such as combustion and explosion may occur. The prior art provides a relay contact assembly and a relay, including a pair of static contact leads, a moving spring, a first arc-isolating member and a second arc-isolating member. Under the joint action of the first arc-isolating member and the second arc-isolating member, the risk of arc erosion on the peripheral side walls of the static contact leads and the peripheral side walls of the moving spring are reduced, thereby achieving comprehensive arc isolation, hindering the transfer of arc, and improving the thoroughness of arc extinguishing.

[0003] However, the surface of the moving contact in the above-mentioned relay contact assembly is mostly flat, or a raised moving contact is directly added to the plane of the active contact. Moreover, the arc-strike effect of the arc-isolating groove set between the moving contact and the moving contact is poor. The arc remains on the active contact for too long, which aggravates the electro-erosion of the moving contact and cannot effectively cut off the arc, making it easy for adverse extreme phenomena such as combustion and explosion to occur. On the other hand, the above-mentioned relay contact assembly installs a first arc-isolating member on the static contact and a second arc-isolating member under the moving contact to isolate and extinguish the arc. The overall structure has too many parts and the assembly process is complicated. Therefore, an active contact and a switching electrical appliance are proposed to solve the above-mentioned problems. Summary of the Invention

[0004] The purpose of the present invention is to provide an active contact piece and a switching electrical appliance, which solves the technical problems that the arc striking effect of the arc isolation groove set between the moving contact and the moving contact piece in the existing relay contact assembly is poor, the arc remains on the active contact piece for too long, the electric erosion of the moving contact is aggravated, the arc cannot be effectively cut off, and adverse extreme phenomena such as combustion and explosion are prone to occur.

[0005] To achieve the above object, the present invention provides an active contact sheet, comprising:

[0006] An active contact body, wherein each of the two ends of the active contact body in the first direction is provided with an active contact, and the active contact comprises: an upper contact and a lower contact, wherein the circumferential outer side of the upper contact is an upper arc-striking surface, and the upper arc-striking surface is spherical as a whole; the circumferential outer side of the lower contact is a first lower arc-striking surface, and the first lower arc-striking surface is spherical as a whole;

[0007] An arc isolation groove is provided on a side of the upper contact facing the center of the active contact body, and a first transition arc striking surface is provided at the connection position between the arc isolation groove and the upper contact;

[0008] A second lower arc-striking surface is provided at the lower portion of both end surfaces of the active contact body in the first direction, and a second transition arc-striking surface is provided at the connection position between the second lower arc-striking surface and the first lower arc-striking surface.

[0009] Preferably, the top surface of the upper contact and the bottom surface of the lower contact are both planes, the top surface of the upper contact protrudes from the top surface of the active contact body in the second direction, the bottom surface of the lower contact is coplanar with the bottom surface of the active contact body, and the second direction is perpendicular to the first direction.

[0010] Preferably, the diameter of the upper contact gradually increases from the top surface of the upper contact to the bottom of the upper arc-striking surface; and the diameter of the lower contact gradually increases from the bottom surface of the lower contact to the top of the first lower arc-striking surface.

[0011] Preferably, the two end surfaces of the active contact piece body in the first direction are arc-shaped surfaces, and the arc-shaped surfaces include: a first arc-shaped surface segment and a second arc-shaped surface segment that are smoothly connected, the first arc-shaped surface segment is adapted to the first transition arc-starting surface, and the second arc-shaped surface segment is adapted to the second lower arc-starting surface.

[0012] Preferably, the curvature of the first arc surface segment is greater than that of the second arc surface segment, and a tangent line of the second arc surface segment at one end close to the side surface of the active contact piece body is perpendicular to the first direction.

[0013] Correspondingly, the present invention also provides a switching electrical appliance, comprising the active contact body described in any one of the above items, and also comprising an electromagnetic system and a ceramic cover, a closed cavity being formed on the inner side of the ceramic cover, a movable bracket being arranged in the closed cavity, the movable bracket being connected to the telescopic end of the electromagnetic system, a support spring being arranged on the top surface of the movable bracket, the active contact body being arranged on the upper end portion of the support spring, two main static contacts being passed through the top surface of the ceramic cover, the electromagnetic system being used to drive the movable bracket to reciprocate in the second direction to control the contact and separation of the active contact and the main static contact, so as to control the circuit of the switching electrical appliance to be turned on or off.

[0014] Preferably, magnetic steels are respectively provided on both sides of the ceramic cover in the first direction, and when the active contact is separated from the main static contact, the two active contacts are respectively located at the center of the magnetic field generated by the magnetic steels.

[0015] Preferably, an insulating gasket is provided on the top surface of the active contact body, and an insulating base is provided on the top surface of the insulating gasket, and the insulating base includes: a base, auxiliary dynamic springs are respectively provided at the two ends of the base in the third direction, the two auxiliary dynamic springs are integrally formed, and auxiliary dynamic contacts are provided at the ends of the auxiliary dynamic springs, two lead terminals are passed through the top surface of the ceramic cover, and auxiliary static contacts are respectively provided at the lower ends of the two lead terminals, and the two auxiliary static contacts are respectively located above the corresponding auxiliary dynamic contacts, and the third direction is perpendicular to the first direction and the second direction.

[0016] Preferably, two connecting brackets are symmetrically arranged on the top surface of the movable bracket, a socket is arranged on the upper portion of the connecting bracket, and positioning protrusions are arranged at both ends of the insulating gasket in the third direction, and the positioning protrusions are inserted into the sockets.

[0017] Preferably, a limiting protrusion is provided on the bottom surface of the active contact body, and a first limiting groove is provided on the top surface of the movable bracket. The limiting protrusion is connected to the upper end of the support spring by a clamping connection, and the first limiting groove is connected to the lower end of the support spring by a clamping connection.

[0018] Compared with the above background technology, the active contact sheet provided by the present invention has the following beneficial effects:

[0019] (1) The active contact in the present invention includes an upper contact and a lower contact. The circumferential outer side of the upper contact is a spherical upper arc-striking surface, and the circumferential outer side of the lower contact is a spherical first lower arc-striking surface. From the top surface of the upper contact to the bottom surface of the lower contact, the diameter of the active contact tends to first increase and then decrease. When the active contact is disconnected from the main static contact, the arc can be quickly drawn from the upper contact through the upper arc-striking surface and the first lower arc-striking surface to the lower surface of the active contact piece and the lower space of the active contact piece, thereby increasing the moving speed of the arc on the surface of the active contact, accelerating the arc separation between the active contact and the main static contact, and preventing other parts from being burned by the arc to a certain extent. It can also reduce the voltage erosion of the active contact and accelerate the arc extinction speed, thereby greatly reducing the erosion effect of the arc on the active contact piece.

[0020] (2) In the present invention, a first transition arc-striking surface is provided at the connection position between the arc-isolating groove and the upper contact, and the first transition arc-striking surface forms an arc guiding path, guiding the arc in the arc-isolating groove to move quickly toward the second transition arc-striking surface and the second lower arc-striking surface. Furthermore, a second lower arc-striking surface is provided at the lower part of the two end surfaces in the first direction of the active contact body, and a second transition arc-striking surface is provided at the connection position between the second lower arc-striking surface and the first lower arc-striking surface. The first transition arc-striking surface, the first lower arc-striking surface, the second transition arc-striking surface and the second lower arc-striking surface form a complete arc-striking path, which facilitates the arc to quickly creep from the arc-isolating groove and the lower contact, further accelerating the arc extinguishing speed, thereby greatly reducing the erosion effect of the arc on the active contact.

[0021] (3) The overall active contact structure of the present invention is simple. There is no need to install a first arc-isolating member on the static contact, and there is no need to install a second arc-isolating member under the active contact to isolate and extinguish the arc. The overall structure is simple and the assembly process is simpler. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0023] Figure 1 A three-dimensional structural diagram of an active contact provided by an embodiment of the present invention;

[0024] Figure 2 A side view of an active contact piece provided by an embodiment of the present invention;

[0025] Figure 3 A top view of an active contact sheet provided by an embodiment of the present invention;

[0026] Figure 4 A three-dimensional structural diagram of a switch device provided by an embodiment of the present invention;

[0027] Figure 5 A schematic cross-sectional view of a switching device according to an embodiment of the present invention at a first angle;

[0028] Figure 6 A schematic cross-sectional view of a switching device according to an embodiment of the present invention at a second angle;

[0029] Figure 7 A schematic cross-sectional view of a switching device according to an embodiment of the present invention at a third angle;

[0030] Figure 8 for Figure 5 A magnified schematic diagram of point A in the middle;

[0031] Figure 9 for Figure 6 A magnified schematic diagram of point B in the middle;

[0032] Figure 10 A schematic diagram of the assembly of the movable bracket and the insulating base provided in an embodiment of the present invention;

[0033] Figure 11 A schematic diagram of the assembly of a wiring assembly provided by an embodiment of the present invention;

[0034] Figure 12A schematic cross-sectional view of a wiring assembly provided by an embodiment of the present invention;

[0035] Figure 13 A schematic cross-sectional view of a wiring assembly provided by an embodiment of the present invention from another angle;

[0036] Figure 14 This is a three-dimensional structural diagram of the insulating limiting plate provided in an embodiment of the present invention.

[0037] Specifically, 1-active contact body; 101-second limiting groove; 102-first assembly groove; 103-limiting protrusion; 2-active contact; 201-upper contact; 202-upper arc-striking surface; 203-lower contact; 204-first lower arc-striking surface; 3-arc-isolating groove; 4-first transition arc-striking surface; 5-second lower arc-striking surface; 6-second transition arc-striking surface; 7-arc-shaped surface; 701-first arc-surface segment; 702-second arc-surface segment; 8-ceramic cover; 801-inner protrusion; 802-end space; 803-middle space; 804-outlet hole; 805-assembly hole; 9-movable bracket; 901-first limiting groove; 10-main static contact; 11 -Electromagnetic system; 1101-push-pull rod; 12-insulating gasket; 1201-positioning protrusion; 1202-first through hole; 13-insulating base; 1301-base; 1302-auxiliary moving spring; 1303-auxiliary moving contact; 1304-second assembly slot; 14-lead terminal; 1401-vertical section; 1402-bending section; 1403-auxiliary static contact; 15-magnet; 16-connecting bracket; 17-rivet; 18-mounting plate; 19-insulating limit plate; 1901-second through hole; 20-support spring; 21-tangent; 22-straight edge; 23-PCB board; 2301-soldering hole; 2302-plug-in terminal. DETAILED DESCRIPTION

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0039] In order to enable those skilled in the art to better understand the solutions of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0040] like Figure 1 、 Figure 2 and Figure 3As shown, in order to achieve the above purpose, the present invention provides an active contact piece, comprising: an active contact piece body 1, wherein the active contact piece body 1 is provided with an active contact 2 at each end thereof in the first direction, wherein the first direction is attached Figure 1 In the middle X direction, the active contact 2 includes: an upper contact 201 and a lower contact 203. The circumferential outer side of the upper contact 201 is an upper arc-inducing surface 202, and the upper arc-inducing surface 202 is spherical as a whole; the circumferential outer side of the lower contact 203 is a first lower arc-inducing surface 204, and the first lower arc-inducing surface 204 is spherical as a whole. The upper arc-inducing surface 202 and the first lower arc-inducing surface 204 are smoothly connected. From the top surface of the upper contact 201 to the bottom surface of the lower contact 203, the diameter of the active contact 2 first increases and then decreases. When disconnected from the main static contact 10, the arc can be quickly drawn from the upper contact 201 through the upper arc-striking surface 202 and the first lower arc-striking surface 204 to the lower surface of the active contact and the lower space of the active contact, increasing the movement speed of the arc on the surface of the active contact 2, accelerating the arc separation between the active contact 2 and the main static contact 10, and preventing other parts from being burned by the arc to a certain extent. It can also reduce the voltage erosion of the active contact 2 and speed up the arc extinction speed, thereby greatly reducing the erosion effect of the arc on the active contact.

[0041] An arc isolation groove 3 is provided on the side of the upper contact 201 facing the center of the active contact body 1. The arc isolation groove 3 is used to separate the active contact body 1 and the upper contact 201. The arc isolation groove 3 is in an arc shape as a whole, and the arc isolation groove 3 is designed around the circumferential outer side of the upper contact 201. A first transition arc striking surface 4 is provided at the connection position between the arc isolation groove 3 and the upper contact 201. The first transition arc striking surface 4 forms an arc guiding path, guiding the arc in the arc isolation groove 3 to move quickly toward the second transition arc striking surface 6 and the second lower arc striking surface 5.

[0042] In addition, a second lower arc-striking surface 5 is provided at the lower part of the two end surfaces in the first direction of the active contact body 1, and a second transition arc-striking surface 6 is provided at the connection position between the second lower arc-striking surface 5 and the first lower arc-striking surface 204. The first transition arc-striking surface 4, the first lower arc-striking surface 204, the second transition arc-striking surface 6 and the second lower arc-striking surface 5 form a complete arc-striking path, which facilitates the arc to quickly creep from the arc isolation groove 3 and the lower contact 203, further accelerates the arc extinguishing speed, and thus greatly reduces the erosion effect of the arc on the active contact.

[0043] It should be noted that compared with the traditional active contact structure design, the active contact structure in the present invention is simple, and there is no need to install a first arc-isolating piece on the static contact, and there is no need to install a second arc-isolating piece under the active contact to isolate and extinguish the arc. The overall structure is simple and the assembly process is simpler.

[0044] In some embodiments of the present invention, the top surface of the upper contact 201 and the bottom surface of the lower contact 203 are both planes, and the top surface of the upper contact 201 protrudes from the top surface of the active contact body 1 in the second direction, that is, the top surface of the upper contact 201 protrudes by a height H1 compared to the top surface of the active contact body 1, and the bottom surface of the lower contact 203 is coplanar with the bottom surface of the active contact body 1. At this time, the length and inclination angle of the upper arc-striking surface 202 can be increased, thereby increasing the pulling effect on the arc and accelerating the creepage speed of the arc, thereby accelerating the arc extinction speed and greatly reducing the erosion effect of the arc on the active contact. Among them, the second direction is perpendicular to the first direction, and the second direction is attached. Figure 2 Middle Z direction.

[0045] It should be noted that the diameter of the upper contact 201 gradually increases from the top surface of the upper contact 201 to the bottom of the upper arc-striking surface 202 to ensure that the upper arc-striking surface 202 is spherical as a whole. In addition, the bottom surface of the lower contact 203 is the bottom surface of the lower contact 203, and the diameter of the lower contact 203 gradually increases from the bottom surface of the lower contact 203 to the top of the first lower arc-striking surface 204 to ensure that the first lower arc-striking surface 204 is spherical as a whole, thereby ensuring that the upper contact 201 is spherical as a whole. 01 to the bottom surface of the lower contact 203, the diameter of the active contact 2 tends to first increase and then decrease. When the active contact 2 is disconnected from the main static contact 10, it is further ensured that the arc can be quickly drawn from the upper contact 201 through the upper arc-starting surface 202 and the first lower arc-starting surface 204 to the lower surface of the active contact piece and the lower space of the active contact piece, thereby increasing the moving speed of the arc on the surface of the active contact 2 and accelerating the arc separation between the active contact 2 and the main static contact 10.

[0046] In some embodiments of the present invention, the two end surfaces of the active contact body 1 in the first direction are arc-shaped surfaces 7, and the arc-shaped surface 7 includes: a first arc surface segment 701 and a second arc surface segment 702 that are smoothly connected, the first arc surface segment 701 is adapted to the first transition arc-starting surface 4, and the second arc surface segment 702 is adapted to the second lower arc-starting surface 5. At the same time, the curvature of the first arc surface segment 701 is greater than the curvature of the second arc surface segment 702, and the tangent 21 at one end position of the second arc surface segment 702 close to the side of the active contact body 1 is perpendicular to the first direction, and the arc in the arc isolation groove 3 is directed to the second transition arc-starting surface 6 and the second lower arc-starting surface 5 move rapidly. By designing the edge of the active contact body 1 into an arc-shaped structure, the arc passes through the first arc surface segment 701 and the second arc surface segment 702 in sequence and is pulled toward the inner side of the ceramic cover 8. Compared with the structural design of the straight edge 22 in the traditional active contact, the arc moves to the end position of the second arc surface segment 702 near the side of the active contact body 1, which is closer to the magnetic steel 15. As a result, the arc is subjected to a greater magnetic field force when it approaches the magnetic steel 15, and the bending amplitude formed by the magnetic blowing is larger, making the arc easier to extinguish, thereby significantly improving the arc extinguishing efficiency. At the same time, it can also prevent the arc from rushing to the auxiliary end of the middle part of the ceramic cover 8, effectively preventing the arc from damaging the auxiliary end of the middle space 803 in the form of creepage.

[0047] like Figure 4 、 Figure 5 and Figure 6 As shown, the present invention also provides a switching electrical appliance, which also includes an electromagnetic system 11 and a ceramic cover 8, wherein a closed cavity is formed on the inner side of the ceramic cover 8, and a movable bracket 9 is arranged in the closed cavity, and the movable bracket 9 is connected to the telescopic end of the electromagnetic system 11. The movable bracket 9 is located above the electromagnetic system 11, and a push-pull rod 1101 is arranged inside the electromagnetic system 11. The push-pull rod 1101 is fixedly connected to the telescopic end of the electromagnetic system 11, and a support spring 20 is provided on the top surface of the movable bracket 9. The upper end of the support spring 20 is provided with an active contact body 1, and two assembly holes 805 are provided on the top surface of the ceramic cover 8. A main static contact 10 is respectively inserted in the two assembly holes 805. The push-pull rod 1101 is driven by the electromagnetic system 11 to drive the movable bracket 9 to reciprocate along the second direction to control the contact and separation of the active contact 2 and the main static contact 10, thereby controlling the circuit conduction or disconnection of the switching electrical appliance.

[0048] In addition, the support spring 20 arranged on the top surface of the movable bracket 9 can elastically support the active contact body 1. When the active contact 2 abuts the main static contact 10, the support spring 20 will be compressed and contracted to a certain length to avoid a rigid collision between the active contact 2 and the main static contact 10, thereby protecting the active contact 2 and the main static contact 10, thereby extending the service life of the entire switching electrical appliance.

[0049] It should be noted that magnets 15 are respectively provided on both sides of the ceramic cover 8 in the first direction. When the active contact 2 is separated from the main static contact 10, the two active contacts 2 are respectively located at the center of the magnetic field generated by the magnet 15. At this time, the larger magnetic field force at the separation position of the active contact 2 and the main static contact 10 can generate a larger Lorentz force on the arc, further increasing the bending amplitude of the arc formed by magnetic blowing, making the arc easier to extinguish.

[0050] like Figure 7 As shown, in some embodiments of the present invention, a closed cavity is formed on the inner side of the ceramic cover 8, and two inner protrusions 801 are respectively provided on both sides of the inner side of the ceramic cover 8 in the first direction, and the four inner protrusions 801 are respectively located on both sides of the first plate in the second direction, and the four inner protrusions 801 divide the internal space of the ceramic cover 8 into an end space 802 and a middle space 803, wherein the end space 802 is an active contact arc ignition and arc extinguishing space, and the middle space 803 is an auxiliary moving contact 1303 arc creepage space. By separating the active contact arc ignition space and the auxiliary moving contact 1303 arc creepage space, it is possible to effectively prevent the high voltage and current in the end space 802 from damaging the low voltage in the middle space 803 in the form of creepage.

[0051] like Figure 8 、 Figure 9 and Figure 10 As shown, in some embodiments of the present invention, an insulating gasket 12 is provided on the top surface of the active contact body 1, and an insulating base 13 is provided on the top surface of the insulating gasket 12. The insulating base 13 includes: a base 1301, and auxiliary dynamic springs 1302 are respectively provided at both ends of the base 1301 in the third direction, wherein the third direction is perpendicular to the first direction and the second direction, and the third direction is attached Figure 3 In the middle Y direction, two auxiliary movable springs 1302 are integrally formed, and auxiliary movable contacts 1303 are provided at the ends of the auxiliary movable springs 1302. Furthermore, two lead terminals 14 are provided on the top surface of the ceramic cover 8, and auxiliary static contacts 1403 are provided at the lower ends of the two lead terminals 14. The two auxiliary static contacts 1403 are respectively located above the corresponding auxiliary movable contacts 1303. When the circuit is connected, the electromagnetic system 11 is controlled to drive the movable bracket 9 to move in the second direction toward the main static contact. Before the active contact 2 abuts the main static contact 10, the auxiliary movable contact 1303 first contacts the auxiliary static contact 1403 to connect the capacitive load. The electromagnetic system 11 is then controlled to drive the movable bracket 9 to move in the second direction toward the main static contact until the main contact abuts the static contact, thereby connecting to the main circuit. This allows the auxiliary contact assembly to connect the capacitive load first, eliminating the influence of the capacitive load and preventing it from affecting the contact resistance after the main contact is connected to the main circuit, effectively increasing the stability of the contact resistance.

[0052] In some embodiments of the present invention, two connecting brackets 16 are symmetrically arranged on the top surface of the movable bracket 9, and a socket is provided on the upper part of the connecting bracket 16. Positioning protrusions 1201 are provided at both ends of the insulating gasket 12 in the second direction. The positioning protrusions 1201 are inserted into the socket. The insulating gasket 12 is fixed by the two connecting brackets 16, and the supporting spring 20 acts to support the active contact body 1, so that the insulating gasket 12 is stably fixed on the top surface of the active contact body 1.

[0053] In addition, a first through hole 1202 is provided on the top surface of the insulating gasket 12, and a rivet 17 is inserted into the first through hole 1202. The outer peripheral side surface of the upper end of the rivet 17 is sleeved with a mounting plate 18. The top surface of the active contact body 1 is provided with a first assembly groove 102 for accommodating the lower end of the rivet 17. The top surface of the base 1301 is provided with a second assembly groove 1304 for accommodating the mounting plate 18. The bottom surface of the mounting plate 18 is fitted with the bottom surface of the second assembly groove 1304, and the mounting plate 18 is fixed in the second assembly groove 1304 by screws, thereby fixing the base 1301 to the top surface of the insulating gasket 12.

[0054] It should be noted that a limiting protrusion 103 is provided on the bottom surface of the active contact body 1, and a first limiting groove 901 is provided on the top surface of the movable bracket 9. The limiting protrusion 103 is clamped and connected to the upper end of the support spring 20, and the first limiting groove 901 is clamped and connected to the lower end of the support spring 20. The design of the limiting protrusion 103 and the first limiting groove 901 can stably limit the two ends of the support spring 20 to ensure the stability of the active contact body 1 when it reciprocates along the second direction, thereby ensuring that the switching electrical appliance can stably control the conduction or disconnection of the circuit.

[0055] like Figure 10 and Figure 14 As shown, optionally, an insulating limit plate 19 is provided on the bottom surface of the active contact body 1. The insulating limit plate 19 is generally U-shaped, and the active contact body 1 is snap-fitted and embedded in the top surface of the insulating limit plate 19. At the same time, a second through hole 1901 is provided on the bottom surface of the insulating limit plate 19. The second through hole 1901 is used to pass the support spring 20. The second through hole 1901 and the limiting protrusion 103 are combined to form a second limiting groove 101. The upper end of the support spring 20 is stably snapped into the second limiting groove 101. At the same time, the insulating limit plate 19 and the insulating gasket 12 cooperate to isolate the active contact body 1 from other components, thereby protecting the entire switch electrical appliance.

[0056] like Figure 11 and Figure 12As shown, in some embodiments of the present invention, a wiring assembly is also provided. The wiring assembly includes: a PCB board 23 disposed on the top surface of the ceramic cover 8, the PCB board 23 being provided with a plurality of solder holes 2301, and the PCB board 23 being provided with a plurality of lead terminals 14. The top surface of the ceramic cover 8 is provided with a plurality of through-holes 804. When the top surface of the ceramic cover 8 coincides with a horizontal plane, the through-holes 804 extend along a second direction. The number of lead terminals 14, the through-holes 804, and the solder holes 2301 is consistent. Specifically, two through-holes 804 are provided on the top surface of the ceramic cover 8, and two solder holes 2301 are provided on the top surface of the PCB board 23. Each lead terminal 14 is disposed within a through-hole 804 and a solder hole 2301, respectively. It should be noted that the lead terminal 14 includes a vertical section 1401 and a bent section 1402. The vertical section 1401 and the bent section 1402 are integrally formed. The vertical section 1401 is inserted into the outlet hole 804, and the bent section 1402 is located in the solder hole 2301. It should be noted that the highest point of the outer peripheral side of the bent section is not higher than the upper surface of the PCB board 23, which reduces the protrusion of the lead terminal 14 on the upper side of the PCB board 23, can effectively reduce the longitudinal size of the wiring assembly, and thus reduce the longitudinal size of the switch electrical appliance, that is, the attached Figure 2 The size in the Z direction is conducive to the miniaturization of high-voltage switchgear.

[0057] It should be noted that the welding hole 2301 extends along the second direction. At the same time, a plug-in end 2302 is provided on the PCB board 23. The plug-in end 2302 is used to connect the lead terminal 14 to the circuit. The bending direction of the bending section 1402 is toward the plug-in end 2302. After the bending section 1402 is accommodated in the welding hole 2301, the lead terminal 14 is welded. By designing the welding hole 2301 to extend along the second direction, the cross-sectional area of ​​the welding hole 2301 is increased, so that the welding hole 2301 can accommodate more solder, and the contact area between the solder and the bending section 1402 is larger, which greatly enhances the connection strength between the vertical metal rod and the PCB board 23, resulting in a better welding effect. Furthermore, compared to a vertical metal rod that directly passes through the solder hole 2301 of the PCB board 23, soldering can only be performed around the annular gap between the solder hole 2301 and the lead terminal 14. By extending the solder hole 2301 along the second direction, the cross-sectional area of ​​the solder hole 2301 is increased. During soldering, it is no longer necessary to operate in the gap between the solder hole 2301 and the vertical metal rod, significantly reducing the difficulty of soldering and making the soldering operation more convenient. Furthermore, after the PCB board 23 is secured to the top surface of the ceramic cover 8, the two outlet holes 804 and the two solder holes 2301 are respectively located between the two main static contacts 10. The bent section 1402 extends along the second direction with the solder hole 2301, thereby effectively utilizing the space between the static contacts. The plurality of solder holes 2301 are each located directly above a respective outlet hole 804, facilitating the miniaturization of the high-voltage switchgear.

[0058] In some embodiments of the present invention, the PCB 23 is strip-shaped and positioned between the two stationary contacts. Specifically, the PCB 23 extends along the second direction. By positioning the thin strip of PCB 23 between the two stationary contacts, the solder holes 2301 are positioned between the two stationary contacts along with the wire outlet holes 804, effectively utilizing the space between the stationary contacts. Alternatively, the PCB 23 can be positioned over the top surface of the ceramic cover 8, which further facilitates the installation and fixation of the PCB 23, allowing the specific position of the solder holes 2301 to be adjusted as needed.

[0059] In some embodiments of the present invention, the uppermost portion of the outer peripheral side surface of the bending section 1402 is located in the same plane as the upper surface of the PCB board 23. At this time, the protruding portion of the lead terminal 14 on the upper side of the PCB board 23 can be reduced, the longitudinal dimension of the wiring assembly can be reduced, and the longitudinal dimension of the switching electrical appliance can be reduced, which is conducive to the miniaturization of the high-voltage switching electrical appliance.

[0060] like Figure 13 As shown, in the second embodiment of the present invention, a certain distance is set between the uppermost portion of the outer peripheral side surface of the bent section 1402 and the upper surface of the PCB board 23. The distance between the uppermost portion of the outer peripheral side surface of the bent section 1402 and the upper surface of the PCB board 23 is set to H2. On the one hand, during soldering, the solder can cover the entire bent section 1402 of the lead terminal 14, further increasing the contact area between the solder and the bent section 1402, and enhancing the connection strength between the vertical metal rod and the PCB board 23. On the other hand, during the soldering operation, the entire solder hole 2301 can be used as a soldering entry point, effectively improving the convenience of soldering.

[0061] It should be noted that the welding hole 2301 is one of a rectangular, an elliptical, and a fan-shaped shape. When the welding hole 2301 is rectangular and extends along the second direction, a space is formed to fit the bent section 1402. This allows the bent section 1402 to be accommodated in the welding hole 2301 and then welded to the lead terminal 14. When the welding hole 2301 is elliptical, the gap between the bent section 1402 and the welding hole 2301 is larger than the gap between the bent section 1402 and the welding hole 2301. The larger gap between the bent section 1402 and the welding hole 2301 facilitates the welding operation and improves welding convenience. When the solder hole 2301 is fan-shaped, the fan-shaped solder hole 2301 is convenient for bending after installing the PCB board 23, thereby reducing the bending accuracy requirements of the lead terminal 14 before installing the PCB board 23. By accurately adjusting the bending angle of the bending section 1402 relative to the vertical section 1401 according to needs in the later stage, the practicality is better.

[0062] In summary, when the active contact 2 and the main static contact 10 are disconnected, the arc can be quickly drawn from the upper contact 201 through the upper arc-starting surface 202 and the first lower arc-starting surface 204 to the lower surface of the active contact piece and the lower space of the active contact piece, increasing the movement speed of the arc on the surface of the active contact 2, accelerating the arc separation between the active contact 2 and the main static contact 10, and preventing other parts from being burned by the arc to a certain extent. It can also reduce the voltage erosion of the active contact 2, speed up the arc extinction speed, and thus greatly reduce the erosion effect of the arc on the active contact piece.

[0063] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0064] The principles and implementation methods of the present invention are described herein using specific examples. The description of the above examples is only intended to help understand the method and core concept of the present invention. It should be noted that those skilled in the art may make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the present invention.

Claims

1. An active contact sheet, characterized in that: include: An active contact body, wherein each of the two ends of the active contact body in the first direction is provided with an active contact, and the active contact comprises: an upper contact and a lower contact, wherein the circumferential outer side of the upper contact is an upper arc-striking surface, and the upper arc-striking surface is spherical as a whole; the circumferential outer side of the lower contact is a first lower arc-striking surface, and the first lower arc-striking surface is spherical as a whole; An arc isolation groove is provided on a side of the upper contact facing the center of the active contact body, and a first transition arc striking surface is provided at the connection position between the arc isolation groove and the upper contact; A second lower arc-striking surface is provided at the lower portion of both end surfaces of the active contact body in the first direction, and a second transition arc-striking surface is provided at the connection position between the second lower arc-striking surface and the first lower arc-striking surface.

2. The active contact sheet according to claim 1, characterized in that: The top surface of the upper contact and the bottom surface of the lower contact are both planes. The top surface of the upper contact protrudes from the top surface of the active contact body in the second direction. The bottom surface of the lower contact is coplanar with the bottom surface of the active contact body. The second direction is perpendicular to the first direction.

3. The active contact sheet according to claim 2, characterized in that: The diameter of the upper contact gradually increases from the top surface of the upper contact to the bottom of the upper arc-striking surface; the diameter of the lower contact gradually increases from the bottom surface of the lower contact to the top of the first lower arc-striking surface.

4. The active contact sheet according to claim 1, characterized in that: The two end surfaces of the active contact body in the first direction are arc-shaped surfaces, and the arc-shaped surfaces include: a first arc-shaped surface segment and a second arc-shaped surface segment that are smoothly connected, the first arc-shaped surface segment is adapted to the first transition arc-starting surface, and the second arc-shaped surface segment is adapted to the second lower arc-starting surface.

5. The active contact sheet according to claim 4, characterized in that: The curvature of the first arc surface segment is greater than that of the second arc surface segment, and a tangent line of the second arc surface segment at one end close to the side surface of the active contact piece body is perpendicular to the first direction.

6. A switch electrical appliance, characterized in that: The active contact body comprises the active contact body according to any one of claims 1 to 5 above, and also comprises an electromagnetic system and a ceramic cover, a closed cavity is formed on the inner side of the ceramic cover, a movable bracket is arranged in the closed cavity, the movable bracket is connected to the telescopic end of the electromagnetic system, a support spring is arranged on the top surface of the movable bracket, the upper end portion of the support spring is arranged with the active contact body, two main static contacts are passed through the top surface of the ceramic cover, the electromagnetic system is used to drive the movable bracket to reciprocate along the second direction to control the contact and separation of the active contact and the main static contact, so that the circuit of the control switch electrical appliance is turned on or off.

7. A switching device according to claim 6, characterized in that: Magnetic steels are respectively provided on both sides of the ceramic cover in the first direction. When the active contact is separated from the main static contact, the two active contacts are respectively located at the center of the magnetic field generated by the magnetic steels.

8. The switch electrical device according to claim 7, characterized in that: An insulating gasket is provided on the top surface of the active contact body, and an insulating base is provided on the top surface of the insulating gasket. The insulating base includes: a base, auxiliary dynamic springs are respectively provided at both ends of the base in the third direction, the two auxiliary dynamic springs are integrally formed, and auxiliary dynamic contacts are provided at the ends of the auxiliary dynamic springs. Two lead terminals are passed through the top surface of the ceramic cover, and auxiliary static contacts are respectively provided at the lower ends of the two lead terminals. The two auxiliary static contacts are respectively located above the corresponding auxiliary dynamic contacts, and the third direction is perpendicular to the first direction and the second direction.

9. The switch electrical device according to claim 8, characterized in that: Two connecting brackets are symmetrically arranged on the top surface of the movable bracket, and a socket is arranged on the upper part of the connecting bracket. Positioning protrusions are arranged at both ends of the insulating gasket in the third direction, and the positioning protrusions are inserted into the socket.

10. A switching device according to any one of claims 8 to 9, characterized in that: A limiting protrusion is provided on the bottom surface of the active contact body, and a first limiting groove is provided on the top surface of the movable bracket. The limiting protrusion is clamped and connected to the upper end of the support spring, and the first limiting groove is clamped and connected to the lower end of the support spring.

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