CN116741583A - Electromagnetic relay - Google Patents

Abstract

The invention provides an electromagnetic relay, comprising a contact system and a base; the contact system comprises a dynamic spring contact set, wherein the dynamic spring contact set comprises a dynamic spring part and a static spring part; the movable spring part comprises a movable contact, the static spring part comprises a static spring leading-out sheet and a static contact, and the static contact is arranged on the static spring leading-out sheet; the static spring leading-out sheet comprises a static spring pin which penetrates through the base bottom plate to be led out; the static spring leading-out sheet is led out downwards after rightward extending around the movable contact from the static contact, so that the static spring pin can be far away from the static contact, and heat is greatly dissipated in the process of conducting the temperature rise of the static contact to the static spring pin, so that the heat conducted to the static spring pin is greatly reduced, and the temperature rise of the static spring pin is greatly reduced.

Description

Electromagnetic relay

Technical Field

The invention relates to the field of switching appliances, in particular to an improvement of an electromagnetic relay.

Background

The relay is used as an electronic control device, and is used for controlling large current through small current, so that the relay is widely applied to an automatic control circuit, and plays roles of automatic adjustment, safety protection, circuit switching and the like in the circuit. The magnetic latching relay is used as one of the relays and is characterized in that the opening and closing states of the contacts completely depend on the action of permanent magnet steel. When the opening and closing states of the contacts need to be converted, the conversion can be completed only by exciting pulse electric signals with a certain width to the coil, and then the states of the contacts are kept by the permanent magnet steel.

At present, the relay is widely applied to the fields of industrial control, household appliances, automobiles and the like, and the application occasions are more and more diversified. In the field of 16A load switching and home appliances, a typical height is 16mm or less and a typical width is 13mm or less. The method is widely applied to occasions with strong inrush current, such as lamp loads, motor loads, electronic ballast loads, solenoids and the like. In general application, a single relay is used to cut off the live wire or the zero line, and from the safety point of view, if one relay can cut off the live wire and the zero line at the same time, the safety coefficient is greatly improved. In the prior art (as in patent CN 106653488B), the movable spring part and the static spring part of the double-pole single-throw magnetic latching electromagnetic relay are both arranged on the base bottom plate, so that the area restriction of the static spring and the movable spring leading-out sheet cannot be increased, the current carrying capacity is poor, and the reed heats seriously. In addition, the movable spring leading-out sheet and the fixed spring of the structure are arranged on the same plane on the base bottom plate, as the heat source point is on the mutual contact point of the movable contact and the fixed contact, the heat source is close to the base bottom plate, and the heat is directly transmitted to the fixed spring pin by the fixed contact in a heat conduction mode, so that the temperature of the fixed spring pin is increased, the creepage distance of the fixed spring pin and the fixed spring pin is small, and the fixed spring pin is easy to be in insulation failure, so that the relay is burnt. Meanwhile, the front side wall and the rear side wall of the base are clung to the inner wall of the shell, so that the ventilation is not facilitated, the overall heat dissipation is poor, and the temperature rise of the pins is too high. Therefore, under the conditions that the height and the mounting area are limited, the load switching capability of the two sets of contacts 16A is high under the current technical conditions, and the relay pin temperature is difficult to be widely applied to the fields of sockets, high-capacity lamp control panels and the like with strict temperature rise requirements.

Disclosure of Invention

To this end, the present invention provides an electromagnetic relay in view of the above-described problems.

The invention is realized by the following scheme:

the invention provides an electromagnetic relay, which is characterized by comprising a contact system and a base; the contact system is arranged in the cavity of the base;

the contact system comprises a dynamic spring contact set, wherein the dynamic spring contact set comprises a dynamic spring part and a static spring part; the movable spring part comprises a movable contact, the static spring part comprises a static spring leading-out sheet and a static contact, and the static contact is arranged on the static spring leading-out sheet; the static spring leading-out sheet comprises a static spring pin which penetrates through the base bottom plate to be led out; define the direction that the base is close to the base bottom plate to be the below, the direction of keeping away from the base bottom plate is the top, its characterized in that:

the fixed contact is arranged above the movable contact, and the fixed spring leading-out sheet extends rightwards from the fixed contact to bypass the movable contact and then is led out downwards.

In one embodiment, the base is provided with a horizontal partition plate and a vertical partition plate, the horizontal partition plate is located above the vertical partition plate, the vertical partition plate extends in the length direction of the base, the base is divided into a first installation cavity, a second installation cavity and a third installation cavity by the horizontal partition plate and the vertical partition plate, the contact system comprises two groups of movable and static spring contact groups, and the second installation cavity and the third installation cavity are respectively used for installing one of the two groups of movable and static spring contact groups.

In one embodiment, the static spring leading-out piece comprises a first part and a second part which are connected together, wherein the first part is used for being fixedly connected with the static contact, the second part is L-shaped integrally, one end of the second part is connected with the first part, and the other end of the second part is provided with the static spring pin.

In one embodiment, a static spring separator is further arranged in the cavity of the base, and can be matched and contacted with the second part of the static spring leading-out sheet and has a limiting effect on the installation of the static spring leading-out sheet, and the static spring separator is made of an insulating material.

Wherein, in one embodiment, the width of the second portion is greater than the width of the spring pin.

Wherein, in an embodiment, electromagnetic relay still includes the shell, all be provided with the ventilation groove on the both sides face of base, after base and shell mutually install the cooperation, the ventilation groove of both sides face can make first installation cavity be linked together in the side department of base with second installation cavity and third installation cavity respectively.

In one embodiment, the ventilation groove is arranged in the middle of the side face of the base, and the left side and the right side of the ventilation groove are respectively provided with a matching surface, and the matching surfaces can be matched with the shell to be tightly attached after the base and the shell are mutually installed and matched.

Wherein, in one embodiment, the movable spring part is mounted on the bottom plate of the base; the first part of the static spring leading-out sheet is positioned above the movable spring part, the L-shaped horizontal part of the second part of the static spring leading-out sheet is positioned above the movable spring part, and the movable contact moves towards the direction away from the bottom plate so that the static contact is attracted.

Wherein, in one embodiment, the movable spring part is mounted on the bottom plate of the base.

In one embodiment, the movable spring part comprises a movable spring leading-out sheet, a lower movable spring, an upper movable spring and a movable contact, wherein a first clamping bud and a second clamping bud are arranged on one side of the movable spring leading-out sheet; the movable spring leading-out sheet is also provided with a first end part and a second end part, and the first end part is provided with a chamfer angle so as to be beneficial to the installation of the movable spring leading-out sheet on the base; the first slot, the second slot and the third slot are arranged on the bottom plate of the second installation cavity of the base, the first clamping bud can be in plug-in fit with the first slot, the second clamping bud can be in plug-in fit with the second slot, and the first end part can be in plug-in fit with the third slot.

The technical scheme provided by the invention has the following technical effects:

1. in the prior art contact part, the static spring is often arranged on the bottom plate, so that the static spring pin position requirement is easily realized, but the static spring area cannot be increased due to the influence of the static spring pin position, so that current carrying difference and heat dissipation are also poor. The invention arranges the static spring above the movable contact, the area of the static spring is not affected by the movable spring leading-out sheet, the area of the static spring can be increased, the current-carrying sectional area of the static spring can be increased, and the heat generation is reduced.

2. The static spring leading-out sheet is arranged above the moving spring leading-out sheet, the contact is used as a heat source point and is positioned between the static spring leading-out sheet and the moving spring leading-out sheet, the heat source point is far away from the base bottom plate, and heat is conducted to a first part of the static spring leading-out sheet and a second part of the static spring leading-out sheet through the static contact in a heat conduction mode, and finally is conducted to the static spring pin. The static spring pin is far away from the static contact, so that the distance between the heat source point and the base bottom plate is increased, the length of a heat conduction path is increased, the heat at the static contact is greatly dissipated in the process of being conducted to the static spring pin, the heat conducted to the static spring pin is greatly reduced, and the heat at the static spring pin is reduced; and because the width of the second part is greater than the width of the static spring pin, the heat radiating area of the heat in the process of conducting the temperature rise at the static contact to the static spring pin is increased, so that the heat radiating speed is further accelerated, and the temperature rise of the static spring pin is further reduced.

3. The invention provides a static spring pin which is easy to influence the creepage distance between contacts, and a static spring baffle is arranged in a second installation cavity of a base. And the quiet spring baffle is insulating material, after first movable spring part and first quiet spring part are installed to the second installation cavity in, can increase the electrical insulation performance between first movable spring part and the first quiet spring part, promote electromagnetic relay's electrical security.

4. The ventilation grooves are formed in the two side faces of the base, after the shell and the base are mutually installed and matched, the ventilation grooves in the two side faces can enable the first installation cavity to be communicated with the second installation cavity and the third installation cavity at the side face of the base respectively, so that the air circulation speed in the cavity is improved, the heat dissipation speed is improved, and the relay overall temperature is reduced. Meanwhile, the vent grooves can rapidly discharge substances and atmosphere decomposed by the electric arcs of the movable contact and the fixed contact, so that the electrical durability of the electromagnetic relay is improved.

5. The static spring is arranged above, and splashes can be directly scattered in the space below the contacts, so that the splashes between the contacts can be reduced to be directly gathered on the contact surface and the static spring leading-out sheet, contact resistance between the contacts is reduced, the influence of the splashes on the insulation strength between the contacts is reduced, heat generation during contact current carrying is reduced, pin temperature rise is further reduced, and the reliability of the relay is improved.

Drawings

Fig. 1 is a perspective view of an electromagnetic relay without a housing installed;

fig. 2 is a front view of the electromagnetic relay without the housing installed;

FIG. 3 is an exploded view of a component of an electromagnetic relay segment;

fig. 4 is an exploded view of the electromagnetic relay;

fig. 5-6 are isometric views of the base of an electromagnetic relay;

fig. 7 is a sectional view of the electromagnetic relay base;

FIG. 8 is an isometric view of a moving spring pull tab;

figure 9 is an isometric view of the upper movable reed;

figure 10 is an isometric view of a lower movable contact spring;

FIG. 11 is an isometric view of a static spring tab;

FIG. 12 is a side view of the static spring lead-out tab;

fig. 13 is a front view of the pusher block.

Detailed Description

For further illustration of the various embodiments, the invention is provided with the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments and together with the description, serve to explain the principles of the embodiments. With reference to these matters, one of ordinary skill in the art will understand other possible embodiments and advantages of the present invention. The components in the figures are not drawn to scale and like reference numerals are generally used to designate like components.

The invention will now be further described with reference to the drawings and detailed description.

As shown in fig. 1 to 4, the double pole single throw magnetic latching electromagnetic relay of the present embodiment includes a base 1, a magnetic circuit system 2, a contact system 3, an armature rotating block assembly 4, a push block 5 and a housing 6. The contact system 3 comprises a first moving and stationary spring contact set 70 and a second moving and stationary spring contact set 80. The base 1 is provided with a horizontal partition 11 and a vertical partition 12, and preferably the horizontal partition 11 is stepped; the horizontal partition plate 11 is positioned above the vertical partition plate 12, the vertical partition plate 12 extends in the length direction of the base 1, and the base 1 is divided into a first installation cavity 13, a second installation cavity 14 and a third installation cavity 15 by the horizontal partition plate 11 and the vertical partition plate 12; the second installation cavity 14 and the third installation cavity 15 are arranged below the base 1 in parallel, and the first installation cavity 13 is positioned above the second installation cavity 14 and the third installation cavity 15. The first installation cavity 13 is used for installing the magnetic circuit system 2, and the second installation cavity 14 and the third installation cavity 15 are respectively used for installing the first movable and static spring contact group 70 and the second movable and static spring contact group 80. The magnetic circuit 3 is capable of providing an actuation force for the moving and static spring contacts of the first moving and static spring contact set 70 and the second moving and static spring contact set 80. The magnetic circuit system 3 and the contact system 2 are distributed up and down to realize strong and weak electric isolation. The first moving and static spring contact group 70 includes a first moving spring portion 71 and a first static spring portion 72, and the second moving and static spring contact group 80 includes a second moving spring portion 81 and a second static spring portion 82.

As shown in fig. 13, the upper part of the pushing block 5 is provided with two connecting arms 52 with a certain distance and a certain length in a protruding way, so that the two sides of the width of the armature 41 are clamped from the width direction of the armature 41 by utilizing the flexible opening characteristic of the two connecting arms 52, and the pushing block 5 is driven to move up and down when the armature 41 swings up and down.

As shown in fig. 1-7 and 13, the lower portion of the pusher block 5 is provided with a pusher slot 53 so that the lower portion of the pusher block 5 forms two cantilevers. The two cantilevers are each provided with a through groove 51, and the push block 5 can be connected to the free ends of the first moving spring portion 71 and the second moving spring portion 81 through the through grooves 51.

The magnetic circuit system 2 comprises an iron core 21, two yokes 22, magnetic steel 23 and a coil assembly 24, wherein the iron core 21 is strip-shaped and horizontally arranged, and the yokes 22 are plate-shaped; the two yokes 22 are respectively fixed at two ends of the iron core 21, and the magnetic steel 23 is matched in the middle of the iron core 21.

The armature rotating block assembly 4 comprises an armature 41 and a rotating block 42, the armature 41 is arranged along the axial direction of the coil, the middle of the armature rotating block assembly 4 is rotatably supported above the position corresponding to the magnetic steel 23, and two ends of the armature rotating block assembly 4 are respectively corresponding to the upper parts of the two yokes 22 so as to perform seesaw type action under the cooperation of the magnetic conductive structure. After excitation, electromagnetic polarity is generated on the two yokes 22, and the armature 41 rotates above the magnetic steel 23 to drive the pushing block 5 to move up and down, so that the dynamic and static contacts are closed and disconnected. After the excitation is lost, the current position state of the armature 41 can be maintained by the magnetic steel 23.

As shown in fig. 1 to 12, the first movable and stationary spring contact group 70 includes a first movable spring portion 71 and a first stationary spring portion 72, and the first movable spring portion 71 is mounted on the bottom plate of the base 1. The first movable spring portion 71 includes a movable spring-drawing piece 711, a lower movable spring 712, an upper movable spring 713, and a movable contact 714. Wherein, a first clamping bud 7111 and a second clamping bud 7112 are arranged on one side of the movable spring leading-out sheet 711; the moving spring guide 711 further has a first end portion 7113 and a second end portion 7115, and a chamfer may be provided on the first end portion 7113 to facilitate the mounting of the first moving spring guide 711 on the base 1. The first slot 141, the second slot 142 and the third slot 143 are arranged on the bottom plate of the second installation cavity 14 of the base 1, the first clamp bud 7111 can be in plug-in fit with the first slot 141, the second clamp bud 7112 can be in plug-in fit with the second slot 142, the first end 7113 can be in plug-in fit with the third slot 143 so as to limit the first movable spring part 71, and the first movable spring part 71 can be installed and fixed on the base 1 more firmly. The second end 7115 of the moving spring leading-out piece 711 is further provided with a moving spring leading-out pin 7114, a slot is arranged on the bottom plate of the second mounting cavity 14 of the base 1, and the moving spring leading-out pin 7114 can extend out of the base 1 from the slot for connection with an external circuit, as shown in fig. 1-2, 5 and 8.

Referring to fig. 1-12, upper movable reed 713 is disposed above lower movable reed 712. The upper movable spring 713 includes a first bending part 7134, a second bending part 7135 and a third bending part 7136 which are sequentially connected in a bending manner, and the third bending part 7136 is fixedly connected with the movable spring leading-out piece 711; the end of the first bending part 7134 far away from the second bending part 7135 is provided with a bending hook 7131, and the bending hook 7131 is matched with the through groove 51 of the pushing block 5. The first bending part 7134 is also provided with an upper contact hole 7133 for installing the movable contact 714; and be equipped with hollow out construction 7132 between hook 7131 and the contact hole 7133, hollow out construction 7132 can promote the flexibility of moving the spring.

The lower movable spring piece 712 includes a fourth bending part 7122, a fifth bending part 7123 and a sixth bending part 7124 which are sequentially connected in a bending manner, and the sixth bending part 7124 is fixedly connected with the movable spring leading-out piece 711; the fourth bent portion 7122 is provided with a lower contact hole 7121 for mounting the movable contact 714. When in installation, the lower movable reed 712 is installed between the upper movable reed 713 and the movable reed drawing piece 711, and the third bent portion 7136, the sixth bent portion 7124 and the first end portion 7113 are fixedly connected in a manner including but not limited to riveting, welding, and the like, and stable mechanical connection and electrical connection among the upper movable reed 713, the lower movable reed 712 and the movable reed drawing piece 711 are realized through the connection. The movable contact 714 is fixedly connected with the first bent portion 7134 of the upper movable contact 713 and the fourth bent portion 7122 of the lower movable contact 712 in a manner including, but not limited to, riveting, welding, etc., and by this connection, a stable mechanical connection and an electrical connection between the movable contact 714, the upper movable contact 713 and the lower movable contact 712 are achieved.

After the movable contact 714, the upper movable contact 713, the lower movable contact 712, and the movable contact tab 711 are fixedly connected, a gap exists between the second bent portion 7135 of the upper movable contact 713 and the fifth bent portion 7123 of the lower movable contact 712. When the relay acts, the upper movable reed 713 and the lower movable reed 712 are bent and deformed, and the gap can reserve a required space for the two movable reeds when the two movable reeds are bent and deformed, so that the adjacent upper movable reed 713 and the adjacent lower movable reed 712 can be prevented from being abutted, stress is avoided between the two adjacent movable reeds, and the relay can be completely attracted.

Referring to fig. 1-4 and 11-12, the first stationary spring portion 72 includes a stationary contact 721 and a stationary spring lead-out tab 722. The stationary spring lead-out piece 722 extends rightward from the stationary contact 721, bypasses the movable contact 714, and is led out downward. Specifically, the stationary spring lead-out tab 722 includes a first portion 7221 and a second portion 7222 connected together, the first portion 7221 being adapted for fixed connection with the stationary contact 721. The second portion 7222 is generally "L" shaped, as shown in fig. 12, one end of the second portion 7222 is connected to the first portion 7221, and the other end of the second portion 7222 is provided with a dead spring pin 7223, where the dead spring pin 7223 can pass through the bottom plate of the base 1 for connection with an external circuit. The first moving and static spring contact set 70 has a contact moving stroke, which is the moving stroke of the moving contact 714, and the height of the L-shaped second portion 7222 covers the contact moving stroke. The width of the second portion 7222 is greater than the width of the sprung leg 7223. Because the second portion 7222 is arranged between the first portion 7221 of the static spring leading piece 722 and the static spring pin 7223, the static spring pin 7223 can be arranged far away from the static contact 721, so that heat is greatly dissipated in the process of conducting to the static spring pin 7223, the heat conducted to the static spring pin 7223 is greatly reduced, and the temperature rise of the static spring pin 7223 is greatly reduced; and because the width of the second portion 7222 is greater than the width of the static spring pin 7223, the heat dissipation area of the heat generated in the process of conducting the heat to the static spring pin 7223 by the temperature rise at the static contact 721 is increased, so that the heat dissipation speed is further accelerated, and the temperature rise of the static spring pin 7223 is further reduced.

After the first movable spring portion 71 and the first stationary spring portion 72 are mounted into the second mounting chamber 14, the stationary contact 721 is positioned above the movable contact 714. The first portion 7221 of the stationary spring-drawing piece 722 is located above the first movable spring portion 71, and the "L" -shaped horizontal portion of the second portion 7222 of the stationary spring-drawing piece 722 is located above the first movable spring portion 71, and the movable contact 714 moves in a direction away from the bottom plate of the base 1 so that the stationary contact 721 is attracted. By providing the stationary contact 721 above the movable contact 714, the area of the stationary spring lead-out piece 722 is not affected by the movable spring lead-out piece 711, and the area of the stationary spring lead-out piece 722 can be increased, so that the current-carrying sectional area of the stationary spring lead-out piece 722 can be increased, and the heat generation can be reduced. Since the heat source point is the contact point between the movable contact 714 and the fixed contact 721, the fixed spring lead-out piece 722 is mostly arranged above the movable spring lead-out piece 711, the heat source point is located between the fixed spring lead-out piece 722 and the movable spring lead-out piece 711, the heat source point is far away from the base 1 bottom plate, and the heat is conducted from the fixed contact 721 to the first part 7221 of the fixed spring lead-out piece 722, then to the second part 7222 of the fixed spring lead-out piece 722 and finally to the fixed spring pin in a heat conduction mode. By increasing the distance between the heat source point and the bottom plate of the base 1 and increasing the length of the heat conduction path and the heat dissipation area of the static spring leading-out piece 722, heat dissipation can be effectively accelerated, and therefore the temperature rise of pins is reduced.

In addition, a static spring separator 144 is arranged in the second mounting cavity 14 of the base 1, and the static spring separator 144 comprises a horizontal part and a vertical part, as shown in fig. 1-5; alternatively, the static spring spacer 144 includes only a horizontal portion or a vertical portion. The static spring spacer 144 is adapted to cooperatively contact the second portion 7222 of the static spring tab 722 and limit the installation of the static spring tab 722. And because the static spring separator 144 is contacted with the second part 7222 of the static spring leading-out piece 722 in a matched manner, the material of the static spring separator 144 has certain heat conducting property, can accelerate the heat emission speed of the static spring leading-out piece 722, and also can further reduce the temperature rise of the static spring pin 7223. And the static spring separator 144 is made of an insulating material, preferably an insulating material with good heat conducting property. After the first movable spring portion 71 and the first stationary spring portion 72 are mounted into the second mounting cavity 14, the electrical insulation performance between the first movable spring portion 71 and the first stationary spring portion 72 can be increased, and the electrical safety of the electromagnetic relay can be improved.

The second movable spring contact set 80 has the same structure as the first movable spring contact set 70, and the second movable spring contact set 80 is adapted to be mounted on the other side of the base 1 different from the first movable spring contact set 70, which is not described herein.

At least one side of the base 1 is provided with an air vent 17. Preferably, ventilation grooves 17 are provided on both side surfaces of the base 1. The ventilation groove 17 is a groove formed in the side face of the base 1, the ventilation groove 17 is formed in the middle of the side face of the base, the left side and the right side of the ventilation groove 17 are respectively provided with a matching surface 18, and the matching surfaces 18 can be matched and attached to the shell 6 after the base 1 and the shell 6 are mutually installed and matched. After the housing 6 and the base 1 are mutually mounted and matched, the ventilation grooves 17 on the two sides can enable the first mounting cavity 13 to be communicated with the second mounting cavity 14 and the third mounting cavity 15 at the side of the base 1 respectively. The ventilation groove 17 can rapidly discharge substances and atmosphere decomposed by the moving and static contact arc, so that the ambient temperature of the second installation cavity 14 and the third installation cavity 15 is further reduced, the influence of temperature rise is reduced, and the electrical durability of the electromagnetic relay is improved.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. An electromagnetic relay comprising a contact system and a base; the contact system is arranged in the cavity of the base;

the contact system comprises a dynamic spring contact set, wherein the dynamic spring contact set comprises a dynamic spring part and a static spring part; the movable spring part comprises a movable contact, the static spring part comprises a static spring leading-out sheet and a static contact, and the static contact is arranged on the static spring leading-out sheet; the static spring leading-out sheet comprises a static spring pin which penetrates through the base bottom plate to be led out; define the direction that the base is close to the base bottom plate to be the below, the direction of keeping away from the base bottom plate is the top, its characterized in that:

the fixed contact is arranged above the movable contact, and the fixed spring leading-out sheet extends outwards from the fixed contact and bypasses the movable contact to be led out downwards.

2. The electromagnetic relay according to claim 1, wherein: the movable spring contact group is provided with a contact movable stroke, the static spring leading-out piece comprises a first part and a second part which are connected together, the first part is fixedly connected with a static contact, the second part is L-shaped integrally, one end of the second part is connected with the first part, and the other end of the second part is provided with a static spring pin, so that the L-shaped high part of the second part covers the contact movable stroke.

3. The electromagnetic relay according to claim 2, wherein: still be provided with quiet spring baffle in the cavity of base, quiet spring baffle includes horizontal portion and/or vertical portion, quiet spring baffle can cooperate the contact with the second part of quiet spring drawing forth piece to play limiting displacement to the installation of quiet spring drawing forth piece, quiet spring baffle is insulating material.

4. The electromagnetic relay according to claim 3, wherein: the width of the second part is larger than that of the static spring pin.

5. The electromagnetic relay according to claim 3, wherein: the electromagnetic relay further comprises a shell, and after the base and the shell are mutually installed and matched, at least one side face of the base is provided with a ventilation groove communicated with a cavity where the movable and static spring contact group is located.

6. The electromagnetic relay according to claim 5, wherein: the base is provided with a horizontal partition plate and a vertical partition plate, the horizontal partition plate is positioned above the vertical partition plate, the vertical partition plate extends in the length direction of the base, the base is divided into a first installation cavity, a second installation cavity and a third installation cavity by the horizontal partition plate and the vertical partition plate, the contact system comprises two groups of movable and static spring contact groups, and the second installation cavity and the third installation cavity are respectively used for installing one of the two groups of movable and static spring contact groups; the ventilation grooves on the two sides of the base can enable the first installation cavity to be communicated with the second installation cavity and the third installation cavity at the side of the base respectively.

7. The electromagnetic relay according to claim 6, wherein: the ventilation groove is a groove formed in the side face of the base, the ventilation groove is formed in the middle of the side face of the base, the left side and the right side of the ventilation groove are respectively provided with a matching surface, and the matching surfaces can be matched with the shell to be tightly attached after the base and the shell are mutually installed and matched.

8. The electromagnetic relay according to claim 2, wherein: the movable spring part is arranged on the bottom plate of the base; the first part of the static spring leading-out sheet is positioned above the movable spring part, the L-shaped horizontal part of the second part of the static spring leading-out sheet is positioned above the movable spring part, and the movable contact moves towards the direction away from the bottom plate so that the static contact is attracted.

9. The electromagnetic relay according to claim 1, wherein: the movable spring part is arranged on the bottom plate of the base.

10. The electromagnetic relay according to claim 9, wherein: the movable spring part comprises a movable spring leading-out sheet, a lower movable spring, an upper movable spring and a movable contact, wherein a first clamping bud and a second clamping bud are arranged on one side of the movable spring leading-out sheet; the movable spring leading-out sheet is also provided with a first end part and a second end part, and the first end part is provided with a chamfer angle so as to be beneficial to the installation of the movable spring leading-out sheet on the base; be provided with first slot, second slot and third slot on the bottom plate of base, first card bud can with first slot grafting cooperation, second card bud can with second slot grafting cooperation, first tip can with third slot grafting cooperation.