WO2021184340A1 - 一种触点装置及电磁开关 - Google Patents

一种触点装置及电磁开关 Download PDF

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Publication number
WO2021184340A1
WO2021184340A1 PCT/CN2020/080371 CN2020080371W WO2021184340A1 WO 2021184340 A1 WO2021184340 A1 WO 2021184340A1 CN 2020080371 W CN2020080371 W CN 2020080371W WO 2021184340 A1 WO2021184340 A1 WO 2021184340A1
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WO
WIPO (PCT)
Prior art keywords
contact
movable contact
base
push rod
spacer
Prior art date
Application number
PCT/CN2020/080371
Other languages
English (en)
French (fr)
Inventor
田晓康
陈太贤
赵福高
黄广明
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2020/080371 priority Critical patent/WO2021184340A1/zh
Priority to CN202080028498.6A priority patent/CN113748480B/zh
Priority to EP20925592.6A priority patent/EP4117008B1/en
Publication of WO2021184340A1 publication Critical patent/WO2021184340A1/zh
Priority to US17/947,531 priority patent/US20230012132A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/54—Contact arrangements
    • H01H50/546—Contact arrangements for contactors having bridging contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/54—Contact arrangements
    • H01H50/62—Co-operating movable contacts operated by separate electrical actuating means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/20—Bridging contacts
    • H01H1/2008—Facilitate mounting or replacing contact bridge and pressure spring on carrier
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/02—Bases; Casings; Covers
    • H01H50/026—Details concerning isolation between driving and switching circuit
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/02—Bases; Casings; Covers
    • H01H50/023—Details concerning sealing, e.g. sealing casing with resin
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/16—Magnetic circuit arrangements
    • H01H50/18—Movable parts of magnetic circuits, e.g. armature
    • H01H50/20—Movable parts of magnetic circuits, e.g. armature movable inside coil and substantially lengthwise with respect to axis thereof; movable coaxially with respect to coil
    • H01H50/22—Movable parts of magnetic circuits, e.g. armature movable inside coil and substantially lengthwise with respect to axis thereof; movable coaxially with respect to coil wherein the magnetic circuit is substantially closed
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/54—Contact arrangements
    • H01H50/56—Contact spring sets

Definitions

  • This application relates to the technical field of electrical control devices, and in particular to a contact device and an electromagnetic switch.
  • Electromagnetic switch refers to an electrical appliance that can frequently close, carry and break normal current and specified overload current. Its working principle is to use the coil to flow current to generate a magnetic field to make the contacts close or open to achieve the purpose of controlling the load. Electromagnetic switches usually include contactors and relays.
  • the coils in the electromagnetic switch generally pass low voltage (such as 12V), and the contacts usually pass high voltage (such as 380V), so as to achieve the purpose of controlling high voltage through low voltage.
  • an insulator is arranged between the contact and the coil to achieve isolation between the high voltage and the low voltage while the low voltage controls the high voltage.
  • the electromagnetic switch installed and used in the vehicle, since the coil is also electrically connected to the low-voltage equipment (such as audio-visual control equipment, USB, etc.) in the vehicle that is directly operated by people, if the insulation between the contact and the coil fails, The high voltage of the contact will be transmitted to the low-voltage equipment of the vehicle through the coil, causing electric shocks. Therefore, in order to ensure the safety of personnel, how to improve the insulation capacity between the contact and the coil is the goal that the industry has been pursuing.
  • the embodiments of the present application provide a contact device and an electromagnetic switch that can improve the insulation capacity between the contact and the coil.
  • an embodiment of the present application discloses a contact device, including a hollow base with an opening on one side, two static contacts arranged on the top of the base at intervals, and a contact device arranged in the base
  • the moving contact assembly ; the top of the base is away from the opening, and the two static contacts extend into the interior of the base.
  • the moving contact assembly includes a plastic spacer, a push rod, a moving contact and an elastic piece. One end of the push rod is installed on the driving device, and the other end is installed on the spacer; the movable contact is installed on the side of the spacer facing away from the push rod.
  • the elastic member is sandwiched between the spacer and the movable contact, so that the contact or separation with a pair of static contacts is achieved under the action of the push rod.
  • the outer wall of the spacer located between the movable contact and the push rod is provided with a plurality of protrusions at intervals.
  • the plastic spacer is used to realize the insulation isolation between the moving contact and the push rod, so as to prevent the impulse voltage flowing after the moving contact is in contact with a pair of static contacts from being transmitted to the coil.
  • a plurality of raised structures similar to high-voltage insulators are spaced apart on the outer wall, which increases the creepage distance on the surface of the material, thereby improving the insulation capability of the isolator.
  • the outer wall of the spacer is provided with a plurality of protrusions protruding at intervals along the axial direction of the push rod.
  • the plurality of protrusions are arranged in a ring or spiral shape along the axial direction of the push rod.
  • the spacer includes a base, and the movable contact and the push rod are respectively installed on opposite sides of the base;
  • the direction of the movable contact protrudes to form a cylinder wall surrounding the elastic member;
  • the plurality of protrusions are arranged at intervals around the outer surface of the cylinder wall.
  • the height refers to the size of the spacer along the axial direction of the push rod.
  • the spacer includes a base, and the movable contact and the push rod are respectively installed on opposite sides of the base;
  • the direction of the movable contact protrudes to form a cylinder wall surrounding the push rod;
  • the plurality of protrusions are arranged at intervals around the outer surface of the cylinder wall. Therefore, it is possible to reduce the intrusion of foreign matter into the insertion hole due to the contact separation between the stationary contact and the movable contact.
  • the spacer includes a base, and the movable contact and the push rod are respectively installed on opposite sides of the base; the plurality of protrusions surround The outer walls of the base are arranged at intervals. In this way, the insulation capability of the spacer can be improved by increasing the creepage distance without increasing the height of the spacer.
  • the moving contact assembly further includes a mounting rod And a limiting member; the base is provided with a positioning protrusion on one side close to the movable contact; the elastic member is sleeved on the positioning protrusion and clamped on the movable contact and the base Between; one end of the mounting rod is installed on the positioning protrusion, and the other end passes through the movable contact and the movable contact is engaged and restricted by the restricting member.
  • the moving contact assembly further includes a contact guide sleeve;
  • the contact guide sleeve includes a shaft sleeve and one end of the shaft sleeve protruding in the radial direction to form a circular flange; the shaft sleeve is sleeved between the mounting rod and the movable contact;
  • the flange is located between the movable contact and the limiting member, and the area of the flange is larger than the area of the limiting member.
  • the moving contact assembly further includes a U-shaped Bracket; the base is provided with a positioning protrusion on a side close to the moving contact, and the elastic member is sleeved on the positioning protrusion and clamped between the moving contact and the base;
  • the U-shaped bracket straddles the movable contact and is connected to the cylinder wall or the base.
  • the end of the sleeve away from the flange abuts against the positioning protrusion.
  • a circular through hole is opened in the middle of the top of the U-shaped bracket, and the diameter of the through hole is larger than the outer diameter of the elastic member, thereby facilitating the installation of the elastic member .
  • an embodiment of the present application discloses an electromagnetic switch including a driving device; the electromagnetic switch further includes the contact device described in the first aspect and any possible implementation of the first aspect; the contact The device is arranged on the driving device; the driving device uses the electromagnetic field generated by the coil to control the opening and closing of the contact device.
  • Fig. 1 is a perspective view of an electromagnetic switch in an embodiment of the application.
  • Fig. 2 is a cross-sectional view of the electromagnetic switch in Fig. 1 along the A-A direction.
  • Fig. 3 is a perspective view of the moving contact assembly in Fig. 2.
  • Fig. 4 is a cross-sectional view of the moving contact assembly in Fig. 3.
  • FIG. 5 is a cross-sectional view of the moving contact assembly in the second embodiment of the application.
  • FIG. 6 is a perspective view of the moving contact assembly in the third embodiment of the application.
  • Fig. 7 is an exploded perspective view of the moving contact assembly in Fig. 6.
  • Fig. 8 is a cross-sectional view of the moving contact assembly in Fig. 6.
  • FIG. 9 is a perspective view of the moving contact assembly in the fourth embodiment of the application.
  • Fig. 10 is a cross-sectional view of the moving contact assembly in Fig. 9.
  • This application provides an electromagnetic switch and a contact device used in the electromagnetic switch, which are used in new energy vehicles, battery packs, or other power distribution circuits to control current on and off, isolate power supply high voltage, etc., so as to ensure the normal operation of the load Or to prevent the risk of electric shock.
  • the embodiments of the present application will be described below in conjunction with the drawings.
  • FIG. 1 is a perspective view of an electromagnetic switch provided by an embodiment of the application.
  • the electromagnetic switch 900 in the embodiment of the present application refers to an electrical appliance capable of frequently closing, carrying and disconnecting normal current and prescribed overload current. Its working principle is to use the coil to flow current to generate a magnetic field to close the contacts to achieve the purpose of controlling the load.
  • Electromagnetic switches usually include electromagnetic relays and contactors. In the embodiments of the present application, a DC contactor is taken as an example for description.
  • the electromagnetic switch 900 includes a driving device 200 and a contact device 100 provided on the driving device 200.
  • the driving device 200 uses the electromagnetic field generated by the coil to drive the moving iron core to control the opening and closing of the contact device 100.
  • the electromagnetic switch 900 in this embodiment is a so-called normally open contactor whose contacts are opened in the initial state. In other embodiments, the electromagnetic switch 900 may be a so-called normally closed contactor whose contact is turned on in the initial state.
  • the electromagnetic switch 900 shown in FIG. 1 usually further includes a housing, for example, the contact device 100 and the driving device 200 are housed in a hollow square housing.
  • the electromagnetic switch 900 in the embodiment of the present application is a schematic diagram omitting the housing.
  • the driving device 200 includes a coil frame 21, a coil 22, a yoke 23, a static iron core 24, a moving iron core 25, a sealing sleeve 26 and a return spring 27.
  • the coil bobbin 21 includes a main body portion 211 having a hollow cylindrical shape, and the main body portion 211 protrudes in the radial direction along both ends in the axial direction to form a circular flange portion 212.
  • the axial direction refers to the direction of the central axis of rotation of the cylinder, that is, the direction parallel to the central axis.
  • the radial direction is perpendicular to the axial direction, that is, the radius or diameter direction of the cylinder end circle.
  • the coil 22 is wound on the main body portion 211 of the bobbin 21 and is located between the two flange portions 212 at both ends of the main body portion 211. It can be understood that both ends of the coil 22 are also connected to coil terminals (not shown in the figure).
  • the coil terminals can be made of conductive materials such as copper, so that the coil 22 can be energized through the coil terminals to drive the driving device 200.
  • the yoke 23 is made of a magnetic material and surrounds the bobbin 21.
  • the yoke 23 is roughly in the shape of a “mouth”, which includes an upper cover plate 231, a pair of side plates 232, and a bottom plate 233 connected in sequence.
  • the upper cover 231, the pair of side plates 231, and the bottom plate 233 all have a rectangular plate structure, and the upper cover 231 and the bottom plate 233 respectively correspond to the two flange portions 212 of the coil bobbin 21.
  • the bottom plate 233 and the pair of side plates 232 can be integrally formed, that is, the bottom plate 233 and the pair of side plates 232 can be continuously formed by bending a single plate.
  • the bottom plate 233 of the yoke 23 is formed with a circular insertion hole 233a, and the sealing sleeve 26 is fitted in the circular insertion hole 233a.
  • the circular insertion hole 233a may be formed by punching, so that the punched part of the bottom plate 233 extends into the main body 211 of the coil bobbin 21 to form the peripheral wall of the insertion hole 233a.
  • the static iron core 24 and the movable iron core 25 are arranged in the main body 211 along the axial direction of the main body 211 of the bobbin 21.
  • the static iron core 24 is fixedly disposed at one end of the main body portion 211 and is close to the upper cover 231.
  • the static iron core 24 is magnetized to generate a suction force, under the action of the suction force, the movable iron core 25 can move in a direction close to the static iron core 24.
  • both the static iron core 24 and the movable iron core 25 have a substantially cylindrical shape.
  • the sealing sleeve 26 is disposed in the coil bobbin 21 and surrounds the static iron core 24 and the moving iron core 25.
  • the sealing sleeve 26 is made of a non-magnetic material and has an open end 261.
  • An annular support surface 212a is formed on the flange portion 212 of the coil bobbin 21 close to the upper cover 231, and the opening end 261 of the sealing sleeve 26 protrudes in the radial direction to form a contact portion 261a.
  • the supporting surface 212a is used to support and fix the abutting portion 261a, thereby preventing the sealing sleeve 26 from falling off.
  • the outer diameters of the static iron core 24 and the movable iron core 25 are approximately the same as the inner diameter of the sealing sleeve 26.
  • the static iron core 24 is arranged on the opening side of the sealing sleeve 26, and the movable iron core 25 moves in the sealing sleeve 26. It can be understood that the moving range of the movable iron core 25 is the space from the end surface of the static iron core 24 away from the open end 261 to the bottom of the sealing sleeve 26.
  • the central portion of the upper cover 231 is provided with an insertion hole 231 a through which the static iron core 24 passes, and the inner diameter of the insertion hole 231 a is smaller than the inner diameter of the sealing sleeve 26.
  • the middle part of one end of the static iron core 24 away from the movable iron core 25 protrudes along the axial direction of the static iron core 24 to form a cylindrical insertion portion 243.
  • the insertion portion 243 is installed in the insertion hole 231a, so as to realize the fixation and installation of the static iron core 24. It can be understood that the insertion hole 241 of the static iron core 24 penetrates the insertion portion 243 for inserting the contact device 100.
  • the return spring 27 is sandwiched between the static iron core 24 and the movable iron core 25.
  • the return spring 27 is used to apply a driving force opposite to the suction force generated by the static iron core 24 to the moving iron core 25, so that when the coil 22 is de-energized, the moving iron core 25 is driven to return to the initial state.
  • the position is to drive the movable iron core 25 to move to the bottom end of the sealing sleeve 26.
  • the entire circumference of the central portion of the insertion hole 241 of the static iron core 24 is provided with a first abutting portion that protrudes toward the center side to reduce the diameter of the insertion hole 241 242.
  • a second abutting portion 252 that protrudes toward the center to reduce the diameter of the insertion hole 251 is provided.
  • the two ends of the return spring 27 are respectively held between the first resisting portion 242 and the second resisting portion 252.
  • the contact device 100 includes a hollow base 10, two static contacts 30 and a movable contact assembly 50.
  • the base 10 is in the shape of a box with an open end, and one side of the opening is disposed on the upper cover 231 of the driving device 200.
  • the top of the base 10 away from the opening is provided with two through holes 11 at intervals, and the two static contacts 30 are respectively fixed to the base 10 through the corresponding through holes 11 and extend into the inside of the base 10.
  • the housing 10 is made of a heat-resistant material (such as ceramic).
  • the static contact 30 has a substantially cylindrical shape and is made of a conductive material such as a copper-based material.
  • the movable contact assembly 50 is located in the base 10, and one end is installed on the driving device 200, so that the movable contact assembly 50 can be driven by the driving device 200 to be in contact with the two static contacts 30 Contact or separation.
  • FIG. 3 is a perspective view of the moving contact assembly in FIG. 2.
  • Fig. 4 is a cross-sectional view of the moving contact assembly in Fig. 3.
  • the movable contact assembly 50 includes a spacer 51, a movable contact 52, a push rod 53 and an elastic member 54.
  • the movable contact 52 and the push rod 53 are respectively installed on opposite sides of the spacer 51.
  • the movable contact 52 is generally a long elliptical plate-shaped structure, and is in contact with or separated from a pair of static contacts 30 under the action of the push rod 53.
  • the push rod 53 has a long substantially round rod shape. One end (the lower end in FIG. 2) of the push rod 53 is connected with the moving iron core 25 of the driving device 200, and the other end (the upper end in FIG. 2) is connected with the partition member 51.
  • the push rod 53 is fixed to the moving iron core 25 while passing through the insertion hole 241 of the static iron core 24, the return spring 27, and the insertion hole 251 of the moving iron core 25, and is driven by the moving iron core 25.
  • the spacer 51 is pushed to move in the base 10 so as to realize the contact or separation between the movable contact 52 and the pair of static contacts 30.
  • the spacer 21 is made of an electrically insulating material, such as plastic, and is used to isolate the movable contact 52 and the push rod 53 from flowing through when the movable contact 52 is in contact with a pair of static contacts 30.
  • the impulse voltage is transmitted to the coil 22.
  • the outer wall of the spacer 51 between the movable contact 52 and the push rod 53 is provided with a plurality of protrusions 51a at intervals.
  • the creepage distance is increased, which is equivalent to providing an insulator structure on the outer wall of the spacer 51, thereby increasing the insulating ability of the spacer 51, thereby It is ensured that the electromagnetic switch 900 will not have insulation failure when the high-voltage load is connected for a long time, and the low-voltage coil 22 will not be affected by the high voltage of the contact and cause personal injury.
  • the outer wall of the spacer 51 is provided with a plurality of protrusions 51 a protruding at intervals along the axial direction of the push rod 53.
  • the plurality of protrusions 51a may be arranged in a ring shape along the axial direction of the push rod 53, or may be arranged in a spiral shape.
  • the shape of the protrusions 51 is not limited.
  • the cross section of each protrusion 51a may be trapezoidal, square, triangular, or semicircular.
  • the movable contact 52 in order to ensure the contact pressure between the movable contact 52 and the two static contacts 10, the movable contact 52 is mounted on the spacer 51 through the elastic member 54. That is, the elastic member 54 is clamped between the spacer 51 and the movable contact 52.
  • the moving contact 52 and the static contact 30 are separated from each other, and when the moving iron core 25 is in a position where the moving iron core 24 is in contact with the static iron core 24, the moving contact 52 is separated from each other.
  • the positional relationship between the movable iron core 25 and the movable contact 52 is set by the way of contact with the static contact 30.
  • the contact device 100 is turned off, and at this time, the two static contacts 30 are disconnected; while the coil 22 is energized, the contact device 100 is turned on, and at this time, the two static contacts 30 are turned on.
  • the contact 30 is connected by the movable contact 52 to be conductive.
  • the elastic member 53 is a coil spring.
  • the contact overtravel can also be achieved by the elastic member 54.
  • the contact overtravel refers to the maximum distance that the movable contact 52 can move upward after the static contact 30 is worn.
  • the spacer 51 in order to realize the fixed installation of the push rod 52 and the elastic member 54, includes a base 511 and a mounting portion arranged at the approximate center of the opposite surface of the base 511 and in a generally cylindrical shape. 512 and positioning convex portion 513.
  • the mounting portion 512 is provided with a mounting hole 512a, and one end of the push rod 53 is inserted (such as riveted) into the mounting hole 512a so that the push rod 53 and the spacer 51 are fixedly installed.
  • the push rod 53 may also form an assembly with the spacer 51 by injection molding.
  • the spacer 51 is positioned relative to the elastic member 54.
  • the peripheral edge of the base 511 protrudes toward the moving contact 52 to form a cylindrical wall 514 surrounding the positioning protrusion 513.
  • the plurality of protrusions 51a are arranged at intervals around the outer surface of the barrel wall 514.
  • the elastic member 54 is sleeved on the positioning protrusion 513 and located in the cylinder wall 514. That is, a groove 515 for receiving part of the elastic member 54 is formed between the inner wall of the cylinder wall 512 and the outer surface of the positioning protrusion 513.
  • the moving contact assembly 50 along the push rod 53 is reduced.
  • the height in the axial direction can further reduce the volume of the base 10, thereby reducing the volume (height) of the electromagnetic switch 900.
  • the peripheral edge of the base portion 511 may also protrude in a direction away from the movable contact 52 to form a cylindrical wall 514a (see FIG. 10) surrounding the mounting portion 512, and the protrusion 51a may also be It is provided on the outer surface of the cylinder wall 514a, and is not limited here.
  • the barrel wall 514a can also reduce the intrusion of foreign matter into the insertion hole 231a due to the contact separation between the pair of static contacts 30 and the movable contact 52.
  • the shape of the barrel enclosed by the barrel wall 514 is not limited, and it may be a circular barrel or a square barrel.
  • the moving contact assembly 50 further includes a mounting rod 55 and a limiting member 56.
  • the positioning convex portion 513 is recessed with a positioning hole 513a.
  • the mounting rod 55 is roughly in the shape of a round rod, one end is embedded in the positioning hole 513a, and the other end passes through the movable contact 52 and extends out of the movable contact 52.
  • the limiting member 56 is engaged with an end of the mounting rod 55 protruding from the movable contact 52 to prevent the movable contact 52 from falling off the mounting rod 55.
  • the limiting member 56 is a circlip.
  • FIG. 5 is a cross-sectional view of the moving contact assembly in the second implementation of the present application.
  • the periphery of the base 551 of the spacer 51 does not protrude toward or away from the movable contact 52 to form a cylindrical wall.
  • the protrusions 51a are arranged at intervals around the outer wall of the base 511. In this way, the thickness of the base 511 needs to be increased to provide as many protrusions 51a as possible to improve the insulation capability of the electromagnetic switch 900.
  • the distance between adjacent protrusions 51a is greater than a preset threshold, and the preset threshold is related to the pollution level of the environment in which the spacer 51 is located.
  • the separation distance between adjacent protrusions 51a needs to be greater than 1mm, otherwise the voltage of the moving contact 52 will break down between the adjacent protrusions 51a
  • the creepage distance of the spacer 51 provided with the protrusion 51a is the same as the creepage distance relative to the spacer without the protrusion 51a. That is, if the distance between the adjacent protrusions 51a is too small, the creepage distance will not increase even though the protrusions 51a are provided, and the insulation capacity of the spacer 51 will not increase as a result.
  • the micro-environmental pollution level used to determine the electrical clearance or creepage distance can be divided into 4 levels.
  • Pollution degree 1 means no pollution or only dry non-conductive pollution
  • pollution degree 2 means that there is only non-conductive pollution in general, but temporary conductivity caused by accidental condensation must be considered
  • pollution degree 3 is Refers to conductive pollution, or the expected condensation to make dry non-conductive pollution conductive
  • pollution level 4 refers to the persistent conductive pollution, such as pollution caused by conductive dust or rain and snow.
  • the position of the movable contact 52 is restricted by the restricting member 56 on the top of the rod 55, and the movable contact 52 is in close contact with the restricting member 56 under the elastic force of the elastic member 54.
  • the stopper 56 due to the small area of the stopper 56, it may cause unevenness on both sides of the moving contact 52, which may cause the moving contact 52 and the two static contacts 30 to be connected and disconnected asynchronously, thereby affecting the electrical of the contact. life.
  • Figure 6 is a perspective view of the moving contact assembly in the third embodiment of the application
  • Figure 7 is a perspective exploded view of the moving contact assembly in Figure 6
  • Figure 8 is a perspective view of the moving contact assembly in Figure 6 Sectional view of the moving contact assembly.
  • the moving contact assembly 50 in the embodiment of the present application further includes a contact guide sleeve 57.
  • the contact guide sleeve 57 includes a shaft sleeve 571 and one end of the shaft sleeve 571 along the axial direction of the shaft sleeve 571 protruding in the radial direction to form a circular flange 572.
  • the shaft sleeve 571 is sleeved outside the mounting rod 55 and is located in the through hole 521 of the movable contact 52.
  • the flange 572 is located between the movable contact 52 and the limiting member 56, and the area of the flange 572 is larger than the limiting member 56. In this way, due to the large area of the flange 572, the upper surface of the movable contact 52 and the lower surface of the flange 572 are in close contact with each other under the elastic force of the elastic member 54, thereby ensuring the same height on both sides of the movable contact 52 , Thereby ensuring the synchronization of the connecting and disconnecting of the movable contact 52 and the two static contacts 30, and improves the electrical life of the contacts.
  • FIG. 9 is a perspective view of the moving contact assembly in the fourth embodiment of the application
  • FIG. 10 is a cross-sectional view of the moving contact assembly in 9.
  • the moving contact 52 in the embodiment of the present application is fixedly installed with the spacer 51 through the U-shaped bracket 58 instead of the mounting rod 55.
  • both ends of the U-shaped bracket 58 are fixedly mounted on the spacer 51, and surround the spacer 51 to form a frame.
  • the movable contact 52 and the elastic member 54 are mounted on the U In the frame enclosed by the type bracket 58 and the spacer 51. In this way, the U-shaped bracket 58 can be used to limit and fix the movable contact 52.
  • a circular through hole 581 a is opened in the middle of the top 581 of the bracket 512, and the diameter of the through hole 581 a is larger than the outer diameter of the elastic member 54.
  • the side portions 582 on opposite sides of the U-shaped bracket 58 are provided with openings 582 a to reduce the weight of the U-shaped bracket 58.
  • the base body A gas is enclosed in 10, and thus, a sealed space K in which the gas is enclosed is formed in the base 10.
  • the gas may be a mixed gas mainly composed of hydrogen, which has the most excellent heat conduction in the temperature region where the arc is generated.
  • the sealing sleeve 26, the upper cover plate 231 and the base 10 form a common sealed chamber.
  • a magnetizing device outside the base 10 can also be used to assist arc blowing. That is, the permanent magnet 60 and the magnetic member 70 are respectively provided on the two opposite sides of the base body 10.
  • the magnetic member 70 is formed in a substantially U-shape by a magnetic material such as iron.
  • the pair of permanent magnets 60 can form a magnetic field that is substantially orthogonal to the direction of contact and separation of the movable contact 52 with respect to the static contact 30, thereby causing the generated arc to be directed in a direction orthogonal to the moving direction of the movable contact 52. It is elongated and cooled by the gas enclosed in the base 10, so that the arc voltage rises sharply.
  • the arc When the arc voltage exceeds the power supply voltage, the arc is cut off. That is, in the electromagnetic switch 900 of the present embodiment, the arc is finally extinguished by the long arc generated by the magnetic field by the magnet and the cooling effect of the gas enclosed in the base 10. In this way, the arc can be cut off in a short time, and the consumption of the static contact 30 and the movable contact 51 can be reduced.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Push-Button Switches (AREA)
  • Electromagnets (AREA)
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Abstract

本申请涉及一种电磁开关，包括驱动装置和触点装置。触点装置包括动触头组件、基体以及间隔设置于基体顶部上的两个静触头。动触头组件包括隔离件、推杆、动触头和弹性件。推杆的一端安装于驱动装置上，且另一端安装于隔离件上。动触头安装于隔离件背向推杆的一侧。弹性件夹设于隔离件和动触头之间，使得动触头在推杆的作用下实现与一对静触头接触或分离。隔离件为塑料件且位于动触头和推杆之间的外壁间隔凸设有多个凸起。如此，通过在隔离件的外壁设置类似于绝缘子结构的凸起结构，增加了材料表面爬电距离，提高了电磁开关的绝缘能力。

Description

一种触点装置及电磁开关 技术领域
本申请涉及电控制器件技术领域，尤其涉及一种触点装置及电磁开关。
背景技术
电磁开关是指能够频繁关合、承载和开断正常电流及规定的过载电流的电器。它的工作原理是利用线圈流过电流产生磁场，使触头闭合或者断开，以达到控制负载的目的。电磁开关通常包括接触器和继电器。
电磁开关中的线圈一般通低电压(如12V)，而触头通常通高电压(如380V)，进而实现通过低压来控制高压的目的。通常，触头和线圈之会设置绝缘件以在低压控制高压的的同时实现高压和低压之间的隔离。然而，对于在车辆中安装使用的电磁开关，由于线圈还与整车内的供人直接操作的低压设备(如影音操控设备、USB等)电连接，若触头与线圈之间的绝缘失效，触头的高电压会通过线圈传递至整车的低压设备，导致人员触电。因此，为了保证人员的安全，如何提高触头与线圈之间的绝缘能力，是业界一直追求的目标。
发明内容
本申请实施例提供一种能够提高触头和线圈之间的绝缘能力的触点装置和电磁开关。
第一方面，本申请实施例公开一种触点装置，包括呈中空状且一侧设置有开口的基体、间隔设置于所述基体的顶部上的两个静触头以及设置于所述基体内的动触头组件；所述基体的顶部远离所述开口，所述两个静触头伸入所述基体内部。所述动触头组件包括塑料隔离件、推杆、动触头和弹性件。推杆的一端安装于驱动装置上，且另一端安装于所述隔离件上；动触头安装于所述隔离件背向所述推杆的一侧。弹性件夹设于所述隔离件和所述动触头之间，使得在所述推杆的作用下实现与一对静触头接触或分离。所述隔离件位于所述动触头和所述推杆之间的外壁间隔凸设有多个凸起。
第一方面的技术方案，塑料隔离件用于实现动触头与推杆的绝缘隔离，以防止当动触头与一对静触头相接触后流过的冲击电压传递至线圈，由于隔离件的外壁上间隔设有多个类似于高压绝缘子的凸起结构，增加了材料表面爬电距离，进而提高了隔离件的绝缘能力。
根据第一方面，在一种可能的实现方式中，为了保证爬电距离的最大化，所述隔离件的外壁沿所述推杆的轴向方向间隔凸设有多个凸起。所述多个凸起沿所述推杆的轴向方向呈环状或者螺旋状排列。
根据第一方面，在一种可能的实现方式中，所述隔离件包括基部，所述动触头和所述推杆分别安装于所述基部的相背两侧；所述基部的周缘朝靠近所述动触头的方向凸伸而形成包围所述弹性件的筒壁；所述多个凸起环绕所述筒壁的外表面间隔设置。如此，可以在通过增加爬电距离来提高隔离件的绝缘能力的同时，降低隔离件的高度，进而减小电磁开关的体积。其中，高度是指隔离件沿推杆轴向方向的尺寸。
根据第一方面，在一种可能的实现方式中，所述隔离件包括基部，所述动触头和所述推杆分别安装于所述基部的相背两侧；所述基部的周缘朝远离所述动触头的方向凸伸而形 成包围所述推杆的筒壁；所述多个凸起环绕所述筒壁的外表面间隔设置。从而能够减少由于以对静触头与动触头的接触分离而产生的异物侵入到插入孔的情况。
根据第一方面，在一种可能的实现方式中，所述隔离件包括基部，所述动触头和所述推杆分别安装于所述基部的相背两侧；所述多个凸起环绕所述基部的外壁间隔设置。如此，可以在通过增加爬电距离来提高隔离件的绝缘能力的同时，不增加隔离件的高度。
根据第一方面，在一种可能的实现方式中，为了实现对动触头的安装固定，并保证动触头和以对静触头接触时的压力，所述动触头组件还包括安装杆和限位件；所述基部靠近所述动触头的一侧设置有定位凸部；所述弹性件套设于所述定位凸部上，并夹持于所述动触头和所述基部之间；所述安装杆的一端安装于所述定位凸部上，且另一端穿过所述所述动触头并通过所述限位件对所述动触头进行卡合限位。
根据第一方面，在一种可能的实现方式中，为了保证动触头和一对静触头接触和分离的同步性，提高触头寿命，所述动触头组件还包括触头导套；所述触头导套包括轴套及轴套沿其轴向方向的一端向径向方向凸伸形成圆形的突缘；所述轴套套于所述安装杆和所述动触头之间；所述突缘位于动触头和所述限位件之间，且所述突缘的面积大于所述限位件的面积。
根据第一方面，在一种可能的实现方式中，为了实现对动触头的安装固定，并保证动触头和以对静触头接触时的压力，所述动触头组件还包括U型支架；所述基部靠近所述动触头的一侧设置有定位凸部，所述弹性件套设于所述定位凸部上，并夹持于所述动触头和所述基部之间；所述U型支架跨过所述动触头并所述筒壁或者所述基部连接。
根据第一方面，在一种可能的实现方式中，为了保证安装杆的稳固性，轴套远离所述突缘的端部与所述定位凸部抵接。
根据第一方面，在一种可能的实现方式中，所述U型支架的顶部的中部开设有圆形的通孔，且通孔的直径大于弹性件的外径，进而可以方便弹性件的安装。
第二方面，本申请实施例公开一种电磁开关，包括驱动装置；所述电磁开关还包括第一方面及第一方面中任意可能的实现方式中所述的的触点装置；所述触点装置设置于所述驱动装置上；所述驱动装置利用线圈产生的电磁场控制所述触点装置的开启和闭合。
附图说明
图1为本申请一实施例中的电磁开关的立体图。
图2为图1中电磁开关沿A-A方向的剖视图。
图3为图2中的动触头组件的立体图。
图4为图3中的动触头组件的剖视图。
图5为本申请第二实施例中的动触头组件的剖视图。
图6为本申请第三实施例中的动触头组件的立体图。
图7为图6中的动触头组件的立体分解图。
图8为图6中的动触头组件的剖视图。
图9为本申请第四实施例中的动触头组件的立体图。
图10为图9中的动触头组件的剖视图。
具体实施方式
本申请提供一种电磁开关以及应用于电磁开关中的触点装置，用于新能源汽车、电池包、或者其它配电回路中用以控制电流通断、隔离电源高压等，从而确保负载正常工作或防止触电风险。下面结合附图，对本申请的实施例进行描述。
请参阅图1，其为本申请一实施例提供的电磁开关的立体图。本申请实施例中的电磁开关900是指能够频繁关合、承载和断开正常电流及规定过载电流的电器。它的工作原理是利用线圈流过电流产生磁场，使触头闭合，以达到控制负载的目的。电磁开关通常包括电磁继电器和接触器。本申请实施例中以直流接触器为例进行说明。
电磁开关900包括驱动装置200和设置于所述驱动装置200上的触点装置100。所述驱动装置200利用线圈产生的电磁场驱动动铁心以控制所述触点装置100的开启和闭合。本实施方式中的电磁开关900是在初始状态下为触点断开的所谓常开型的接触器。其他实施方式中，电磁开关900也可以是在初始状态下为触点接通的所谓常闭型的接触器。
可以理解，图1中所示的电磁开关900通常还包括外壳，例如触点装置100和驱动装置200收容于一中空的方形外壳内。而本申请实施例中的电磁开关900则为省去了外壳的示意图。
请一并结合图2，图2为图1中电磁开关沿A-A方向的剖视图。所述驱动装置200包括线圈骨架21、线圈22、轭铁23、静铁芯24、动铁芯25、密封套筒26及复位弹簧27。具体地，所述线圈骨架21包括呈中空圆筒状的主体部211，主体部211沿其轴向方向的两端向径向方向凸伸形成圆形的凸缘部212。其中，轴向是指圆柱体旋转中心轴的方向，即与中心轴平行的方向。径向垂直于轴向，即圆柱体端面圆的半径或直径方向。
线圈22缠绕在所述线圈骨架21上的主体部211上并位于主体部211两端的两个凸缘部212之间。可以理解，线圈22的两端还连接有线圈端子(图未示)。例如，线圈端子可以使用铜等导电材料制成，如此可以通过线圈端子对线圈22通电以对驱动装置200进行驱动。
轭铁23由磁性材料构成且包围线圈骨架21。本申请实施方式中，轭铁23大致呈“口”字型，其包括依次连接的上盖板231、一对侧板232及底板233。其中，上盖板231、一对侧板231及底板233均呈矩形板状结构，且上盖板231和底板233分别对应线圈骨架21的两个凸缘部212。在一实施方式中，底板233和一对侧板232可以一体成型，即底板233和一对侧板232可以通过一张板弯折而连续的形成。
此外，轭铁23的底板233形成有圆形的插通孔233a，该圆形的插通孔233a中装配有所述密封套筒26。具体地，所述圆形的插通孔233a可以通过冲压的方式形成，如此该底板233被冲压的部分伸入所述线圈骨架21的主体部211内以形成该插通孔233a的周壁。
所述静铁芯24和所述动铁芯25沿所述线圈骨架21的主体部211的轴向方向设置于所述主体部211内。其中，静铁芯24固定设置于所述主体部211的一端且靠近所述上盖板231。当线圈22通电后静铁芯24因被磁化而产生吸力，在所述吸力的作用下动铁芯25可向靠近静铁芯24的方向移动。本实施方式中，静铁芯24和动铁芯25均大致呈圆柱状。
密封套筒26设置于线圈骨架21内且包围所述静铁芯24和所述动铁芯25。本实施方式中，密封套筒26由非导磁性材料构成，且具有开口端261。所述线圈骨架21的靠近上盖板231的凸缘部212上形成有圆环状的支撑面212a，所述密封套筒26的开口端261沿径向方向凸伸形成有抵接部261a。所述支撑面212a用于承载固定所述抵接部261a，进而可防止密封套筒26脱落。
本申请实施例中，所述静铁芯24和动铁芯25的外径与所述密封套筒26的内径大致相同。所述静铁芯24设置于所述密封套筒26的开口侧，所述动铁芯25在所述密封套筒26内移动。可以理解，所述动铁芯25的移动范围为静铁芯24远离开口端261的端面至所述密封套筒26的底部的空间。
另外，上盖板231的中央部贯通开设有供静铁芯24穿过的插接孔231a，且所述插接孔231a的内径小于所述密封套筒26的内径。静铁芯24远离所述动铁芯25的一端的中部沿静铁芯24的轴向方向凸伸形成圆柱形的插接部243。所述插接部243安装于所述插接孔231a中，进而实现对静铁芯24的固定和安装。可以理解，所述静铁芯24的插通孔241贯穿所述插接部243，用于插接所述触点装置100。
复位弹簧27夹设于所述静铁芯24和所述动铁芯25之间。所述复位弹簧27用于对动铁芯25施加与所述静铁芯24所产生的吸力的方向相反的驱动力，进而可以使得当线圈22断电时驱动所述动铁芯25回复到初始位置，即驱动动铁芯25移动至密封套筒26的底端。
需要说明的是，本申请实施例中，所述静铁芯24的插通孔241的中部的整周上设置有朝向中心侧突出而使插通孔241的孔径减小的第一抵持部242。所述动铁芯25的插通孔251的底部的整周上设置有朝向中心侧突出而使插通孔251的孔径减小的第二抵持部252。所述复位弹簧27的两端分别抵持于所述第一抵持部242和第二抵持部252之间。
所述触点装置100包括中空状的基体10、两个静触头30和动触头组件50。基体10呈一端开口的箱状，且开口的一侧设置于所述驱动装置200的上盖板231上。基体10远离开口的顶部间隔设置有两个通孔11，两个静触头30分别穿过对应的通孔11固定于所述基体10上，并伸入所述基体10内部。本申请实施例中，壳体10由耐热性材料(如陶瓷)制成。静触头30大致呈圆筒型且由铜系材料等导电性材料制成。
动触头组件50位于所述基体10内，且一端安装于驱动装置200上，进而使得所述动触头组件50在所述驱动装置200的驱动下可以和所述两个静触头30相接触或分离。
请再结合参阅图3和图4，其中图3为图2中的动触头组件的立体图。图4为图3中的动触头组件的剖视图。具体地，所述动触头组件50包括隔离件51、动触头52、推杆53和弹性件54。所述动触头52和所述推杆53分别安装于所述隔离件51的相背的两侧。其中，所述动触头52大致呈长条的椭圆形板状结构，并在所述推杆53的作用下实现与一对静触头30的接触或分离。
推杆53呈较长的大致圆棒形状。推杆53的一端(图2中的下端)连接有驱动装置200的动铁芯25，且另一端(图2中的上端)与隔壁件51连接。所述推杆53在穿过静铁芯24的插通孔241、复位弹簧27以及动铁芯25的插通孔251的状态下固定于动铁芯25，进而在动铁芯25的带动下推动隔离件51在基体10内移动，从而实现动触头52与一对静触头30的接触或分离。
隔离件21由例如塑料等具有电绝缘性的材料构成，用于实现动触头52与推杆53的绝缘隔离，以防止当动触头52与一对静触头30相接触后流过的冲击电压传递至线圈22。本申请实施例中，所述隔离件51位于动触头52和推杆53之间的外壁间隔凸设有多个凸起51a。如此，通过在隔离件51的外壁上间隔凸设有多个凸起51a，增加了爬电距离，相当于在隔离件51的外壁设置了绝缘子结构，进而提高了隔离件51的绝缘能力，从而保证电磁开关900在长期接通高压负载时不会出现绝缘失效，低压线圈22不会受到触头高压的影响而造成人身伤害。
为了保证爬电距离的最大化，所述隔离件51的外壁沿所述推杆53的轴向方向间隔凸设有多个凸起51a。例如，多个凸起51a可以沿着推杆53的轴向呈环状排列，也可呈螺旋状排列。此外，凸起51的形状不做限定，例如，每个凸起51a的横截面可以呈梯形、方形、三角形或半圆形等。
一种实施方式中，为了保证动触头52和两个静触头10之间的接触压力，动触头52通过所述弹性件54安装于所述隔离件51上。也即，弹性件54夹持于所述隔离件51和动触头52之间。本实施方式中，以在动铁芯25处于初始位置时动触头52与静触头30相互分离、且在动铁芯25处于与所述静铁芯24相抵接的位置时动触头52与静触头30接触的方式来设定动铁芯25与动触头52的位置关系。即，在未对线圈22通电的期间，触点装置100断开，此时两个静触头30之间断开；在对线圈22通电的期间，触点装置100接通，此时两个静触头30通过动触头52连接而导通。本实施方式中，弹性件53为螺旋弹簧。
此外，通过弹性件54还可以实现触头超程。其中，触头超程是指静触头30磨损后，动触头52可向上移动的最大距离。
一种实施方式中，为了实现对推杆52和弹性件54的固定安装，所述隔离件51包括基部511以及在基部511的相背的表面的大致中央处设置且呈大致圆柱形状的安装部512和定位凸部513。安装部512开设有安装孔512a，推杆53的一端嵌入(如铆接)安装孔512a而使得推杆53和隔离件51固定安装。其他实施方式中，推杆53还可以通过注塑的方式与隔离件51形成组件。另外，通过向弹性件54的内径部嵌入隔离件51的定位凸部513，从而使隔离件51相对于弹性件54定位。
在一个具体的实施方式中，所述基部511的周缘朝靠近所述动触头52的方向凸伸形成包围所述定位凸部513的筒壁514。所述多个凸起51a环绕所述筒壁514的外表面间隔设置。所述弹性件54套设于定位凸部513上且位于筒壁514内。也即，所述筒壁512的内壁与所述定位凸部513的外表面之间形成用于收容部分弹性件54的凹槽515。本申请实施方式中，由于所述基部511的周缘朝靠近所述动触头52的方向凸伸形成围绕所述定位凸部513的筒壁514，减小了动触头组件50沿推杆53轴向方向的高度，进而可以减小基体10的体积，从而减小电磁开关900的体积(高度)。
可以理解，其他实施方式中，所述基部511的周缘也可以朝远离所述动触头52的方向凸伸形成包围所述安装部512的筒壁514a(参图10)，凸起51a也可以设置于筒壁514a的外表面上，在此不做限定。本申请实施例中，通过筒壁514a还可以减少由于一对静触头30与动触头52的接触分离而产生的异物侵入到插入孔231a的情况。
此外，由筒壁514所围成的桶的形状也不限定，其可以是圆形桶，也可以是方形桶。
为了便于实现对动触头52的安装固定，所述动触头组件50还包括安装杆55及限位件56。所述定位凸部513上凹设有定位孔513a。安装杆55大致呈圆棒状，一端嵌入定位孔513a中，且另一端穿过动触头52并伸出动触头52。限位件56卡合于安装杆55伸出动触头52的一端，以防止动触头52从安装杆55上脱落。本实施方式中，限位件56为卡簧。
组装时，先将弹性件54放入凹槽515内，然后将动触头52安装于安装杆55的一端上，再将安装杆55的另一端插入定位孔513中，接着使用工装将动触头52压下，漏出安装杆55顶部的卡槽，最后装入限位件56进行限位即可。
请参阅图5，图5是本申请第二实施中的动触头组件的剖视图。相较于图4中的动触头组件50不同的是，隔离件51的基部551的周缘并未向靠近或者远离动触头52的方向凸伸而形成筒壁。本申请实施例中，凸起51a环绕所述基部511的外壁间隔设置。如此，则需要增加基部511的厚度来设置尽可能多的凸起51a来提高电磁开关900的绝缘能力。
然而，并不是凸起51a设置的数量越多，隔离件51的绝缘能力越强，上述各实施例中，还需要根据实际使用情况来设计相邻凸起51a之间的距离。一种实施方式中，相邻的凸起51a沿所述推杆53轴向方向之间的间隔距离大于预设阈值，所述预设阈值与所述隔离件51所处环境的污染等级相关。例如，若隔离件51所处环境的污染等级为2级，则需要相邻的凸起51a之间的间隔距离大于1mm，否则动触头52的电压将会击穿相邻凸起51a之间的空气传递，进而使得设置有凸起51a的隔离件51的爬电距离与相对于没有设置凸起51a的隔离件的爬电距离相同。也即，若相邻凸起51a之间的距离过小，会导致虽然设置了凸起51a，但是爬电距离却没有增加，隔离件51的绝缘能力并没有提高的结果。
其中，用来确定电气间隙或爬电距离的微观环境污染等级可以分为4级。污染等级1是指无污染或仅有干燥的非导电性的污染；污染等级2是指一般情况仅有非导电性污染，但必须考虑到偶然由凝露造成短暂的导电性；污染等级3是指有导电性污染，或由预期的凝露使干燥的非导电性污染变为导电性的；污染等级4是指造成持久性的导电性污染，例如由于导电尘埃或雨雪所造成的污染。
上述各实施例中，通过安装杆55顶部的限位件56来限制动触头52的位置，动触头52在弹性件54的弹性力的推动下与限位件56紧密接触。然而，由于限位件56的面积较小，可能导致动触头52两侧高低不平，进而导致动触头52与两个静触头30接通、断开不同步，从而影响触头的电气寿命。
请参阅图6-图8，其中图6为本申请第三实施例中的动触头组件的立体图；图7为图6中的动触头组件的立体分解图；图8为图6中的动触头组件的剖视图。如图6-图8所示，与图4中的动触头组件50不同的是，本申请实施例中的动触头组件50还包括触头导套57。触头导套57包括轴套571及轴套571沿其轴向方向的一端向径向方向凸伸形成圆形的突缘572。轴套571套于安装杆55外，且位于动触头52的通孔521内。所述突缘572位于动触头52和限位件56之间，且突缘572的面积大于限位件56。如此，由于突缘572的面积较大，使得动触头52的上表面与突缘572的下表面在弹性件54的弹性力的推动下紧密接触，进而可保证动触头52两侧高度一致，从而保证了动触头52和两个静触头30接通和断开的同步性，提高了触头的电气寿命。
此外，为了保证安装杆55的稳固性，轴套571远离所述突缘572的端部与所述定位凸 部513抵接。
请参阅图9和图10，其中图9为本申请第四实施例中的动触头组件的立体图；图10为9中的动触头组件的剖视图。和图4中的动触头组件不同的是，本申请实施例中的动触头52通过U型支架58与隔离件51固定安装，而不是通过安装杆55。具体地，如图9和图10所示，U型支架58的两端固定安装于隔离件51上，并与隔离件51围成一个框架，所述动触头52和弹性件54安装于U型支架58与隔离件51所围成的框架内。如此通过U型支架58可以实现对动触头52进行限位固定。
在一些实施方式中，所述支架512的顶部581的中部开设有圆形的通孔581a，且通孔581a的直径大于弹性件54的外径。组装时，首先将U型支架58与隔离件51通过注塑成型的方式形成组件，然后将弹性件54通过通孔581a放入隔离件51内，接着使用工装将弹性件54下压然后将动触头52插入U型支架58内即可。
在一些实施方式中，所述U型支架58的相对两侧的侧部582上开设有开口582a，以降低U型支架58的配重。
请再次参阅图1-图2，在一些实施方式中，在动触头52被从静触头30拉离时，为了抑制在动触头52与静触头30之间产生电弧，可以向基体10内封入气体，如此，在基体10内形成封入有气体的密封空间K。其中，该气体可以为在产生电弧的温度区域中导热最优异的氢气为主体的混合气体。
需要说明的是，本申请实施方式中，密封套筒26、上盖板231和基体10形成共通的密封室。
在另一些实施方式中，还可以在基体10外部增磁性装置辅助吹弧。即在基体10相对的两侧分别设置永磁体60和磁性构件70。磁性构件70由铁等磁性材料形成为大致U字状。如此，通过该一对永磁体60可以形成与动触头52相对于静触头30的接触分离方向大致正交的磁场，进而使得产生的电弧被向与动触头52的移动方向正交的方向拉长，同时被封入到基体10内的气体冷却，从而使电弧电压急剧上升，当电弧电压超过电源电压时电弧被切断。即，在本实施方式的电磁开关900中，通过由磁铁产生的磁场长电弧和由封入到基体10内的气体冷却作用最终熄灭电弧。如此，能够将电弧在短时间内切断，能够减小静触头30以及动触头51的消耗。
以上是本申请实施例的实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本申请实施例原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也视为本申请的保护范围。

Claims (10)

  1. 一种触点装置，包括呈中空状且一侧设置有开口的基体、间隔设置于所述基体的顶部上的两个静触头以及设置于所述基体内的动触头组件；所述基体的顶部远离所述开口，所述两个静触头伸入所述基体内部；其特征在于，所述动触头组件包括：
    隔离件，由塑料制成；
    推杆，一端安装于驱动装置上，且另一端安装于所述隔离件上；
    动触头，安装于所述隔离件背向所述推杆的一侧；以及
    弹性件，夹设于所述隔离件和所述动触头之间，使得所述动触头在所述推杆的作用下实现与所述两个静触头的接触或分离；
    所述隔离件位于所述动触头和所述推杆之间的外壁间隔凸设有多个凸起。
  2. 如权利要求1所述的触点装置，其特征在于，所述隔离件的外壁沿所述推杆的轴向方向间隔凸设有多个凸起。
  3. 如权利要求2所述的触点装置，其特征在于，所述多个凸起沿所述推杆的轴向方向呈环状或者螺旋状排列。
  4. 如权利要求1-3任一项所述的触点装置，其特征在于，所述隔离件包括基部，所述动触头和所述推杆分别安装于所述基部的相背两侧；所述基部的周缘朝靠近所述动触头的方向凸伸而形成包围所述弹性件的筒壁；所述多个凸起环绕所述筒壁的外表面间隔设置。
  5. 如权利要求1-3任一项所述的触点装置，其特征在于，所述隔离件包括基部，所述动触头和所述推杆分别安装于所述基部的相背两侧；所述基部的周缘朝远离所述动触头的方向凸伸而形成包围所述推杆的筒壁；所述多个凸起环绕所述筒壁的外表面间隔设置。
  6. 如权利要求1-3任一项所述的触点装置，其特征在于，所述隔离件包括基部，所述动触头和所述推杆分别安装于所述基部的相背两侧；所述多个凸起环绕所述基部的外壁间隔设置。
  7. 如权利要求4-6任一项所述的触点装置，其特征在于，所述动触头组件还包括安装杆和限位件；所述基部靠近所述动触头的一侧设置有定位凸部；所述弹性件套设于所述定位凸部上，并夹持于所述动触头和所述基部之间；所述安装杆的一端安装于所述定位凸部上，且另一端穿过所述动触头并通过卡合所述限位件以对所述动触头进行限位。
  8. 如权利要求7所述的触点装置，其特征在于，所述动触头组件还包括触头导套；所述触头导套包括轴套及轴套沿其轴向方向的一端向径向方向凸伸形成圆形的突缘；所述轴套套于所述安装杆和所述动触头之间；所述突缘位于动触头和所述限位件之间，且所述突 缘的面积大于所述限位件的面积。
  9. 如权利要求4-6任一项所述的触点装置，其特征在于，所述动触头组件还包括U型支架；所述基部靠近所述动触头的一侧设置有定位凸部，所述弹性件套设于所述定位凸部上，并夹持于所述动触头和所述基部之间；所述U型支架跨过所述动触头且端部与所述基部或者所述筒壁连接。
  10. 一种电磁开关，包括驱动装置；其特征在于，所述电磁开关还包括如权利要求1-9任一项所述的触点装置；所述触点装置设置于所述驱动装置上；所述驱动装置利用线圈产生的电磁场控制所述触点装置的开启和闭合。
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