CN110620022A - High-voltage large-current magnetic force maintaining vacuum relay - Google Patents

Abstract

The invention discloses a high-voltage and high-current magnetic force holding vacuum relay, which includes a housing, a first electromagnetic assembly and a second electromagnetic assembly are arranged in the housing, and a magnetic The movable contact assembly includes a movable contact, the first electromagnetic assembly and the second electromagnetic assembly generate magnetic fields in opposite directions when current passes through, and the first electromagnetic assembly is provided with a fixed contact. The invention can carry high voltage and large current, and by setting the first electromagnetic assembly and the second electromagnetic assembly, it can control the rapid contact or separation between the movable contact and the fixed contact, and avoid the gap between the movable contact and the fixed contact. Hours are kept too long to generate an arc, prolonging the service life of the relay.

Description

High voltage and high current magnetic holding vacuum relay

technical field

The invention relates to the technical field of relays, in particular to a high-voltage and high-current magnetic force holding vacuum relay.

Background technique

Electromagnetic relays are generally composed of electromagnets, armatures, spring sheets, contacts, etc. Electromagnetic relays can realize remote control and automatic control. As long as a certain voltage is applied to both ends of the coil, a certain current will flow through the coil. As a result, the electromagnetic effect is generated, and the armature will overcome the pulling force of the return spring to attract the iron core under the action of electromagnetic force, thereby driving the movable contact of the armature to contact the fixed contact (normally open contact). When the coil is de-energized, the electromagnetic suction will disappear, and the armature will return to its original position under the reaction force of the spring, so that the moving contact will be separated from the original fixed contact (normally closed contact). Such contact and separation achieve the purpose of conducting and cutting off in the circuit.

The existing electromagnetic relay uses the electromagnet to produce magnetism and magnetic disappearance under the condition of power-on and power-off, and to achieve the function of controlling the circuit switch due to the magnetic attraction with the armature with the contact. Usually, the electromagnet circuit is disconnected. The current way on the relay separates the electromagnet and the armature. When the high voltage and high current pass through the relay, when the moving contact and the fixed contact contact or separate, the gap is extremely small, and the circuit voltage is almost all applied to the contact. Between the points, a strong electric field is formed, and the free electrons in the cathode escape to the anode, which becomes a strong electric field emission. Electrons move at high speed, collide with neutral gas molecules, and ionize them. After ionization, the positive ions move to the cathode, hit the surface of the cathode to increase the temperature, and then form thermionic emission, and then participate in impact ionization, so a large number of charged particles will be formed between the electrodes, making the gas conduct electricity to form a hot electron flow, that is, an arc . The arc generated in the relay will burn the contacts, which will reduce the service life of the relay or even make it impossible to use normally.

Contents of the invention

Aiming at the deficiencies and defects of the existing technology, a high-voltage and high-current magnetic holding vacuum relay is provided, which can carry high-voltage and high-current. By setting the first electromagnetic component and the second electromagnetic component, it can control the quick contact between the movable contact and the fixed contact. Or separated, to avoid the electric arc from being kept too long when the gap between the moving contact and the fixed contact is small, and prolong the service life of the relay.

To achieve the above object, the present invention provides the following technical solutions.

The high-voltage and high-current magnetic force holding vacuum relay includes a housing, a first electromagnetic assembly and a second electromagnetic assembly are arranged in the housing, and a movable contact with magnetism is arranged between the first electromagnetic assembly and the second electromagnetic assembly. Assemblies, the movable contact assembly includes a movable contact, the first electromagnetic assembly and the second electromagnetic assembly generate a magnetic field in the opposite direction when a current passes through, the first electromagnetic assembly is provided with a fixed contact, when the first electromagnetic assembly When current passes through the assembly and the second electromagnetic assembly, the movable contact assembly moves to the first electromagnetic assembly and makes the movable contact contact with the fixed contact or the movable contact assembly moves to the second electromagnetic assembly and separate the movable contact from the fixed contact, when the direction of the current passing through the first electromagnetic assembly and the second electromagnetic assembly changes, the movable contact assembly moves to the second electromagnetic assembly and makes the The movable contact is separated from the fixed contact or the movable contact assembly moves to the first electromagnetic assembly and makes the movable contact contact with the fixed contact.

The beneficial effects of the present invention are: the present invention sets the first electromagnetic assembly and the second electromagnetic assembly, and when the first electromagnetic assembly and the second electromagnetic assembly have currents passing through, the first electromagnetic assembly and the second electromagnetic assembly generate magnetic fields in opposite directions , so that the direction of the magnetic field generated by one of the electromagnetic components is the same as the direction of the magnetic field of the moving contact component, thereby generating repulsion to the moving contact component, and the direction of the magnetic field generated by the other electromagnetic component is opposite to the direction of the magnetic field of the moving contact component. The moving contact assembly generates suction. Since the moving contact assembly is located between the first electromagnetic assembly and the second electromagnetic assembly, the repulsion and suction generated by the two magnetic field pairs act on the moving contact assembly in the same direction, so that The movable contact assembly can move quickly, and the movable contact can quickly contact or separate from the fixed contact. When it is necessary to change the contact state between the movable contact and the fixed contact, by changing The direction of the current makes the magnetic fields generated by the first electromagnetic component and the second electromagnetic component both change, so that the direction of the magnetic field generated by one of the electromagnetic components changes from the original direction of the magnetic field of the moving contact component to the same as the magnetic field of the moving contact component The direction is opposite, so that the force on the moving contact assembly changes from repulsion to attraction, and the direction of the magnetic field generated by another electromagnetic assembly changes from being opposite to the direction of the magnetic field of the moving contact assembly to being the same as the direction of the magnetic field of the moving contact assembly , so that the force on the moving contact assembly changes from suction to repulsion, and the two magnetic fields act on the moving contact assembly opposite to the original force, so that the moving direction of the moving contact assembly changes, and the moving contact and The fixed contact changes from contact or separation to separation or contact, and the magnetic field generated by the two electromagnetic components simultaneously exerts force on the moving contact component, so that the moving contact and the fixed contact can be quickly contacted or separated to avoid moving contact When the gap between the point and the fixed contact is kept too long and an arc is generated, the service life of the relay is prolonged.

As an improvement of the present invention, the movable contact assembly further includes a first mounting base, a second mounting base, a first magnet and a second magnet, the first mounting base and the second mounting base are plug-fitted, so The movable contact is located between the first installation seat and the second installation seat, the first magnet is installed in the first installation seat, and the second magnet is installed in the second installation seat. Through the above improvements, the movable contact assembly is magnetic.

As an improvement of the present invention, a first insulating gasket is provided between the movable contact and the first mounting seat, and a second insulating gasket is provided between the movable contact and the second mounting seat. Through the above improvement, the movable contact is insulated from the first mounting base and the second mounting base.

As an improvement of the present invention, the movable contact includes a base body and a contact point arranged on the base body, the base body is ring-shaped, and a plurality of installation arms extend outward from the outer periphery of the base body, and the contact point is arranged on mounting arm.

As an improvement of the present invention, a first connecting seat and a second connecting seat are also provided in the housing, the first electromagnetic assembly is arranged in the first connecting seat, and the second electromagnetic assembly is arranged in the second connecting seat. In the seat, the fixed contact is arranged on the first connecting seat, and the movable contact is movably arranged between the first connecting seat and the second connecting seat. Through the above improvements, the assembly of the whole relay is facilitated.

As an improvement of the present invention, the fixed contact is provided with a positioning post, and the first connecting seat is provided with a positioning hole matching with the positioning post, and the positioning post passes through the positioning hole and is connected to a wiring board. Through the above improvement, the positioning and installation of the fixed contact and the connection between the fixed contact and the wiring board are facilitated.

As an improvement of the present invention, the second connecting seat has a plurality of protrusions extending along the circumference in the direction where the first connecting seat is located, and a guide groove that cooperates with the mounting arm is formed between two adjacent protrusions. Through the above improvements, the movement of the movable contact is made more stable.

As an improvement of the present invention, the first electromagnetic assembly includes a first wire package, the first wire package includes a first coil former and a first coil wound on the first coil former, and the second electromagnetic The assembly includes a second wire package, and the second wire package includes a second coil frame and a second coil wound on the second coil frame. Through the above improvements, when a current flows through the first coil, the first coil generates a magnetic field, and when the direction of the current changes, the direction of the magnetic field generated by the first coil changes, and when a current passes through the second coil, the second coil generates a magnetic field , when the direction of the current changes, the direction of the magnetic field generated by the second coil changes.

As an improvement of the present invention, the first electromagnetic assembly further includes a first magnetic steel, the first magnetic steel is arranged in the first coil frame, the second electromagnetic assembly further includes a second magnetic steel, the The second magnetic steel is arranged in the second coil frame. Through the above improvements, the first electromagnetic assembly and the second electromagnetic assembly can always have a magnetic field.

As an improvement of the present invention, the first electromagnetic assembly further includes a first magnetic yoke, and the first magnetic yoke is sheathed outside the first wire package, and the second electromagnetic assembly further includes a second magnetic yoke, so The second magnetic yoke is sheathed outside the second wire package. Magnetic diffusion is prevented by setting the first magnetic yoke and the second magnetic yoke.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the present invention.

Fig. 2 is a schematic diagram of the present invention after the housing is removed.

Fig. 3 is a sectional view of Fig. 2 in the present invention.

Fig. 4 is a schematic diagram of the present invention after removing the first connecting seat and the second connecting seat in Fig. 2 .

Fig. 5 is a schematic diagram of the structure of the movable contact of the present invention.

Fig. 6 is a schematic structural diagram of the first electromagnetic assembly of the present invention.

Fig. 7 is a schematic structural diagram of the second electromagnetic assembly of the present invention.

Fig. 8 is a schematic diagram of the structure of the first connecting seat of the present invention.

Fig. 9 is a schematic diagram of the structure of the second connecting seat of the present invention.

In the figure, 1. shell; 2. moving contact; 2.1. substrate; 2.2. mounting arm; 2.3. contact point; 3. fixed contact; Wire package; 4.2, the first magnet; 4.3, the first yoke; 5, the second electromagnetic assembly; 5.1, the second wire package; 5.2, the second magnet; 5.3, the second yoke; 6, the first mounting seat ; 7, the second mounting seat; 8, the first magnet; 9, the second magnet; 10, the first insulating gasket; 11, the second insulating gasket; 12, the first connecting seat; 12.1, positioning hole; 13, The second connecting seat; 13.1, protrusion; 13.2, guide groove; 14, wiring board.

Detailed ways

The present invention is further explained in conjunction with the accompanying drawings.

Referring to Fig. 1 to Fig. 9, the high-voltage and high-current magnetic force holding vacuum relay includes a housing 1, the housing 1 has an installation cavity, and the housing 1 is provided with a first electromagnetic assembly 4 and a second electromagnetic assembly 5, so A magnetic movable contact assembly is provided between the first electromagnetic assembly 4 and the second electromagnetic assembly 5, and the movable contact 2 is movably arranged between the first electromagnetic assembly 4 and the second electromagnetic assembly 5. The first electromagnetic assembly The assembly 4 includes a first wire package 4.1, the first wire package 4.1 includes a first coil frame and a first coil wound on the first coil frame, the second electromagnetic assembly 5 includes a second wire package 5.1, a second wire Package 5.1 includes a second bobbin and a second coil wound on the second bobbin. In this embodiment, the winding direction of the first coil is opposite to that of the second coil, so that when the same current passes through the first coil and the second coil, the first coil and the second coil generate magnetic fields in opposite directions. In addition, in another embodiment, the winding direction of the first coil can be the same as that of the second coil, so that the two Currents in opposite directions pass through the first coil and the second coil respectively, and at this time, the first coil and the second coil can also generate magnetic fields in opposite directions.

The moving contact assembly includes a moving contact 2, a first mounting seat 6, a second mounting seat 7, a first magnet 8 and a second magnet 9, and the moving contact 2 includes a base body 2.1 and a contact set on the base body 2.1. Point 2.3, the base 2.1 is annular, and the outer circumference of the base 2.1 has a plurality of installation arms 2.2 extending outward, and the plurality of installation arms 2.2 are distributed on the outer circumference of the base 2.1 along the circumference, and the contact point 2.3 is set on the installation arm 2.2 , the first connection seat 12 and the second connection seat 13 are connected by plug-in fit, the base body 2.1 of the movable contact 2 is arranged between the first connection seat 12 and the second connection seat 13, and the first magnet 8 is installed on the first In the mounting seat 6, the second magnet 9 is installed in the second mounting seat 7, the first magnet 8 and the second magnet 9 are all magnetic steels made of AlNiCo alloy material, through the first magnet 8 and the second magnet. Two magnets 9 make the movable contact assembly magnetic.

A first insulating gasket 10 is provided between the movable contact 2 and the first mounting seat 6 to insulate between the movable contact 2 and the first mounting seat 6, and the movable contact 2 and the second A second insulating gasket 11 is provided between the mounting bases 7 to insulate the movable contact 2 from the second mounting base 7. Since the movable contact 2 contacts the fixed contact 3, the circuit will be conducted. Insulation treatment is used to prevent the circuit from being transmitted to other parts of the relay and to avoid leakage.

The first electromagnetic component 4 is provided with a fixed contact 3, which is correspondingly ring-shaped, and the fixed contact 3 is connected with a wiring board 14, and the wiring board 14 is used for connecting with a circuit wire. By arranging a plurality of installation arms 2.2, each installation arm 2.2 is provided with a plurality of contact points 2.3, so that the contact area between the movable contact 2 and the fixed contact 3 is large, and can carry high voltage and large current.

When the first coil in the first electromagnetic assembly 4 and the second coil in the second electromagnetic assembly 5 have electric current to pass through, the first coil of the first electromagnetic assembly 4 and the second coil of the second electromagnetic assembly 5 produce opposite directions Magnetic field, if the direction of the magnetic field generated by the first coil is the same as the direction of the magnetic field of the moving contact assembly, and the direction of the magnetic field generated by the second coil is opposite, then the magnetic field generated by the first coil will generate repulsion to the moving contact assembly, and the second coil will generate The magnetic field of the magnetic field generates suction force on the movable contact assembly, and the movable contact assembly moves to the direction of the second electromagnetic assembly 5, so that the movable contact 2 is separated from the fixed contact 3; The direction of the magnetic field of the point assembly is opposite, and the direction of the magnetic field generated by the second coil is the same as that of the moving contact assembly, so the magnetic field generated by the first coil generates an attraction force on the moving contact assembly, and the magnetic field generated by the second coil acts on the moving contact assembly. A repulsive force is generated, and the movable contact assembly moves toward the direction of the first electromagnetic assembly 4, so that the movable contact 2 is in contact with the fixed contact 3. Since the movable contact assembly is located between the first electromagnetic assembly 4 and the second electromagnetic assembly 5, The repulsive force and the attractive force generated by the two magnetic field pairs act on the movable contact assembly in the same direction, so that the movable contact 2 can quickly contact or separate from the fixed contact 3 .

When it is necessary to change the contact state between the movable contact 2 and the fixed contact 3, by changing the direction of the current passing through the first electromagnetic assembly 4 and the second electromagnetic assembly 5, the first electromagnetic assembly 4 and the second electromagnetic assembly 5 generate All the magnetic fields are changed, so that the direction of the magnetic field generated by one of the electromagnetic components is changed from the same as the direction of the magnetic field of the moving contact component to the opposite direction of the magnetic field of the moving contact component, so that the force on the moving contact component is changed from repulsive force It becomes a suction force, where the direction of the magnetic field generated by another electromagnetic component changes from the original opposite to the direction of the magnetic field of the moving contact component to the same direction as the magnetic field of the moving contact component, so that the force acting on the moving contact component changes from suction to Repulsion, the force of the two magnetic fields on the moving contact assembly is opposite to the original force, so that the moving direction of the moving contact assembly changes, and the moving contact 2 and the fixed contact 3 change from contact or separation to separation or contact . The magnetic field generated by the two electromagnetic components simultaneously exerts force on the movable contact assembly, so that the movable contact 2 and the fixed contact 3 can be quickly contacted or separated, and the gap between the movable contact 2 and the fixed contact 3 can be avoided When the time is kept too long when it is small, an arc is generated, which prolongs the service life of the relay. The relay can carry high voltage and large current. By switching the current, the on-off between the movable contact 2 and the fixed contact can be quickly switched.

As an improvement of the present invention, the first electromagnetic assembly 4 also includes a first magnetic steel 4.2, and the first magnetic steel 4.2 is arranged in the first bobbin, and the second electromagnetic assembly 5 also includes a second magnetic steel Steel 5.2, the second magnetic steel 5.2 is arranged in the second bobbin, the first magnetic steel 4.2 and the second magnetic steel 5.2 are made of AlNiCo alloy material, the first magnetic steel 4.2 and the second magnetic steel 5.2 Both have a certain magnetic field, and when the first coil is energized, it will magnetize the first magnet 4.2, so that the direction of the magnetic field of the first magnet 4.2 is the same as that of the first electromagnetic assembly 4, and when the second coil is energized, it will magnetize the second The magnetic steel 5.2 makes the magnetic field direction of the second magnetic steel 5.2 the same as the magnetic field direction of the second electromagnetic assembly 5, so that both the first magnetic steel 4.2 and the second magnetic steel 5.2 can generate attraction force on the movable contact 2, but the first magnetic steel Steel 4.2 and second magnetic steel 5.2 produce suction to the movable contact 2 and cannot drive the movable contact assembly to move, only when the movable contact assembly moves to the first electromagnetic assembly 4 due to the magnetic field of the first coil and the second coil Or when the second electromagnetic assembly 5 is located, the movable contact assembly can be attracted by the first magnetic steel 4.2 or the second magnetic steel 5.2. Specifically, when the movable contact assembly moves to the first electromagnetic assembly 4 due to the magnetic field action of the first coil and the second coil, the first electromagnetic assembly 4 and the second electromagnetic assembly 5 are de-energized, because the first magnetic steel 4.2 and the existence of the second magnet 5.2, the first magnet 4.2 generates attraction to the movable contact assembly, the second magnet 5.2 generates repulsion to the movable contact assembly, the movable contact assembly can be absorbed by the first magnet 4.2, The movable contact assembly can maintain the state when the power is off, and the movable contact 2 is in contact with the fixed contact 3. When the movable contact assembly moves to the second electromagnetic assembly 5 due to the magnetic field of the first coil and the second coil , the first electromagnetic assembly 4 and the second electromagnetic assembly 5 are powered off, due to the existence of the first magnetic steel 4.2 and the second magnetic steel 5.2, the first magnetic steel 4.2 generates repulsion to the movable contact assembly, and the second magnetic steel 5.2 The moving contact assembly generates suction, and the moving contact assembly can be absorbed by the second magnetic steel 5.2, so that the moving contact assembly can maintain the state when the power is off, and the moving contact 2 is separated from the fixed contact 3. By setting the first The magnetic steel 4.2 and the second magnetic steel 5.2 enable the movable contact 2 and the fixed contact 3 to maintain the state when the first electromagnetic assembly 4 and the second electromagnetic assembly 5 are powered off.

The first electromagnetic assembly 4 also includes a first yoke 4.3, and the first yoke 4.3 is sheathed outside the first wire package 4.1. By setting the first yoke 4.3, the magnetic field generated by the first coil can be prevented from spreading, The magnetic field generated by the first coil can be concentrated, and the effect on the movable contact 2 is better. The second electromagnetic assembly 5 also includes a second yoke 5.3, and the second yoke 5.3 is sleeved on the second wire package 5.1 In addition, by setting the second yoke 5.3, the diffusion of the magnetic field generated by the second coil can be prevented, so that the magnetic field generated by the second coil can be concentrated, and the effect on the movable contact 2 is better. The first wire package 4.1 is fixed on the In the first yoke 4.3, the second wire package 5.1 is fixed in the second yoke 5.3 by glue, when the first coil and the second coil are energized to generate a magnetic field, by fixing the first wire package 4.1 and the second wire package 5.1, it can Avoid that the first wire package 4.1 and the second wire package 5.1 will move relative to each other.

The first yoke 4.3 is provided with a first guide hole cooperating with the first mounting base 6, and the second yoke 5.3 is provided with a second guiding hole cooperating with the second mounting base 7. The first mounting base Part 6 extends into the first guide hole, and part of the second mounting base 7 extends into the second guide hole. When the movable contact assembly reciprocates between the first electromagnetic assembly 4 and the second electromagnetic assembly 5, it passes through the first The guide hole guides the first mounting seat 6, and the second guide hole guides the second mounting seat 7, so that the movement of the movable contact assembly is more stable, and the deviation is not easy to occur, ensuring that the contact between the movable contact 2 and the fixed contact 3 is consistent. separate.

As an improvement of the present invention, a first connection seat 12 and a second connection seat 13 are also provided in the housing 1, the first electromagnetic assembly 4 is arranged in the first connection seat 12, and the second electromagnetic assembly The component 5 is arranged in the second connecting seat 13 , the fixed contact 3 is arranged on the first connecting seat 12 , and the movable contact 2 is arranged between the first connecting seat 12 and the second connecting seat 13 . This facilitates the assembly of the entire relay.

The fixed contact 3 is provided with a positioning post 3.1, and the first connecting seat 12 is provided with a positioning hole 12.1 that cooperates with the positioning post 3.1. The positioning post 3.1 passes through the positioning hole 12.1 and is connected to a wiring board 14. The positioning column 3.1 extends into the positioning hole 12.1, so that the fixed contact 3 can be stably arranged on the first connection seat 12, which facilitates the positioning and installation of the fixed contact 3 and the connection between the fixed contact 3 and the wiring board 14. The second connection seat 13 has a plurality of protrusions 13.1 extending toward the direction of the first connection seat 12, and the plurality of protrusions 13.1 are distributed along the circumference of the end of the second connection seat 13, and a plurality of protrusions 13.1 are formed between two adjacent protrusions 13.1. There is a guide groove 13.2 that cooperates with the installation arm 2.2. When the movable contact 2 reciprocates under the action of the magnetic field, it drives the installation arm 2.2 to move in the guide groove 13.2. The movement of the contact point 2 is more stable and less likely to deviate.

In addition, after the assembly of the relay is completed, the housing 1 will be vacuumed and sealed. In this embodiment, after the parts in the housing 1 are assembled, the housing 1 will be vacuumed and the housing 1 The opening of the body 1 is sealed with glue, so that the inside of the housing 1 is in a vacuum environment, which can prevent the movable contact and the fixed contact from being oxidized during contact, prolong the service life of the relay, and reduce power loss.

The above is only a preferred embodiment of the present invention, so all equivalent changes or modifications made according to the structure, features and principles described in the scope of the patent application of the present invention are included in the scope of the patent application of the present invention.

Claims (10)

1. High-voltage and high-current magnetic force holding vacuum relay, including a housing (1), characterized in that: the housing (1) is provided with a first electromagnetic assembly (4) and a second electromagnetic assembly (5), and the first electromagnetic assembly (5) A magnetic movable contact assembly is movable between the first electromagnetic assembly (4) and the second electromagnetic assembly (5), the movable contact assembly includes a movable contact (2), and the first electromagnetic assembly (4) A magnetic field in the opposite direction is generated when a current passes through the second electromagnetic assembly (5), and the first electromagnetic assembly (4) is provided with a fixed contact (3). When the first electromagnetic assembly (4) and the second electromagnetic assembly ( 5) When current passes, the moving contact assembly moves to the first electromagnetic assembly (4) and makes the moving contact (2) contact the fixed contact (3) or the moving contact assembly moves to the second electromagnetic assembly (5) and separate the movable contact (2) from the fixed contact (3), when the current direction passing through the first electromagnetic assembly (4) and the second electromagnetic assembly (5) When a change occurs, the movable contact assembly moves to the second electromagnetic assembly (5) and separates the movable contact (2) from the fixed contact (3) or the movable contact assembly moves to the first The electromagnetic assembly (4) and makes the movable contact (2) contact with the fixed contact (3). 2. The high-voltage and large-current magnetic force holding vacuum relay according to claim 1, characterized in that: the moving contact assembly also includes a first mount (6), a second mount (7), a first magnet (8 ) and the second magnet (9), the first mounting base (6) and the second mounting base (7) are plugged and fitted, and the moving contact (2) is located between the first mounting base (6) and the second mounting base Between the seats (7), the first magnet (8) is installed in the first installation seat (6), and the second magnet (9) is installed in the second installation seat (7). 3. The high-voltage and high-current magnetic holding vacuum relay according to claim 2, characterized in that: a first insulating gasket (10) is provided between the movable contact (2) and the first mounting base (6), A second insulating gasket (11) is provided between the movable contact (2) and the second mounting seat (7). 4. The high-voltage and high-current magnetic holding vacuum relay according to claim 2 or 3, characterized in that: the movable contact (2) includes a base (2.1) and a contact point (2.3) arranged on the base (2.1) , the base (2.1) is ring-shaped, a plurality of installation arms (2.2) extend outward from the outer periphery of the base (2.1), and the contact point (2.3) is arranged on the installation arms (2.2). 5. The high-voltage and large-current magnetic holding vacuum relay according to claim 4, characterized in that: a first connection seat (12) and a second connection seat (13) are also provided in the housing (1), and the The first electromagnetic assembly (4) is arranged in the first connecting seat (12), the second electromagnetic assembly (5) is arranged in the second connecting seat (13), and the fixed contact (3) is arranged in the first On the connecting seat (12), the movable contact (2) is movably arranged between the first connecting seat (12) and the second connecting seat (13). 6. The high-voltage and high-current magnetic holding vacuum relay according to claim 5, characterized in that: the fixed contact (3) is provided with a positioning column (3.1), and the first connecting seat (12) is provided with A positioning hole (12.1) matched with the positioning post (3.1), the positioning post (3.1) passes through the positioning hole (12.1) and is connected with a wiring board (14). 7. The high-voltage and high-current magnetic holding vacuum relay according to claim 5, characterized in that: the second connecting seat (13) has a plurality of protrusions (13.1) extending along the circumference toward the first connecting seat (12) ), a guide groove (13.2) cooperating with the mounting arm (2.2) is formed between two adjacent protrusions (13.1). 8. The high-voltage and high-current magnetic holding vacuum relay according to claim 1, characterized in that: the first electromagnetic assembly (4) includes a first wire package (4.1), and the first wire package (4.1) includes a second A coil frame and a first coil wound on the first coil frame, the second electromagnetic component (5) includes a second wire package (5.1), and the second wire package (5.1) includes the second coil frame and is wound on the first coil frame The second coil on the second coil bobbin. 9. The high-voltage and high-current magnetic force holding vacuum relay according to claim 8, characterized in that: the first electromagnetic assembly (4) also includes a first magnet (4.2), and the first magnet (4.2) is set In the first coil frame, the second electromagnetic assembly (5) further includes a second magnet steel (5.2), and the second magnet steel (5.2) is arranged in the second coil frame. 10. The high-voltage and high-current magnetic holding vacuum relay according to claim 8, characterized in that: the first electromagnetic assembly (4) also includes a first yoke (4.3), and the first yoke (4.3) covers Located outside the first wire package (4.1), the second electromagnetic component (5) further includes a second magnetic yoke (5.3), and the second magnetic yoke (5.3) is sheathed outside the second wire package (5.1).