CN220796595U - Electromagnetic relay and power equipment - Google Patents

Abstract

The present utility model relates to an electromagnetic relay comprising: a coil; the movable iron core can move up and down along with the excitation and demagnetization of the coil; the movable iron core is sleeved on the push rod, and the lower end of the push rod is connected with the movable iron core; a first binding post and a second binding post; the upper end of the push rod is provided with a movable contact plate, the push rod and the movable contact plate can move between a first position and a second position under the drive of the movable iron core, the first binding post and the second binding post are electrically connected through the movable contact plate in the state that the movable iron core is positioned at the first position, and the first binding post and the second binding post are electrically disconnected in the state that the movable iron core is positioned at the second position; and a magnetic element disposed below the movable core, the magnetic element being capable of attracting the movable core. In addition, the utility model also provides power equipment comprising the electromagnetic relay. The utility model attracts the movable iron core through the magnetic element, thereby improving the safety and reliability of the electromagnetic relay.

Description

Electromagnetic relay and power equipment

Technical Field

The present utility model relates to a relay, and in particular, to an electromagnetic relay. Further, the present utility model relates to an electric power apparatus including the electromagnetic relay.

Background

An electromagnetic relay is an electric control element, and an electromagnetic relay can be used for controlling a high-voltage and high-current working circuit through a low-voltage and low-current control circuit. The electromagnetic relay uses the control signal to control the electromagnet to generate magnetic force and controls the armature, thereby controlling the contact to open or close.

However, in the electromagnetic relay of the related art, if an external impact force is applied to the axial direction of the push rod when the electromagnetic relay is not excited, the movable contact may be in contact with the contact point due to the movement of the movable member as a whole when the external impact force is greater than the precompressed force value of the return spring, thereby causing malfunction. Therefore, in order to improve the shock resistance, the prior art enables the electromagnetic relay to resist the shock by increasing the spring constant of the return spring, but in order to ensure the smoothness of the actuation of the electromagnetic relay actuation, it is necessary to increase the attraction force of the electromagnet so that it is larger than the force exerted by the return spring, and the power loss is larger.

In view of the foregoing, there is a need to design an electromagnetic relay capable of overcoming the above technical problems and effectively solving or alleviating the above technical drawbacks.

Disclosure of Invention

The utility model aims to solve the technical problem of providing an electromagnetic relay, wherein a movable iron core is attracted by a magnetic element, so that the shock resistance of the electromagnetic relay is improved, and the electromagnetic relay has low power loss and simple structure.

Further, the technical problem to be solved by the utility model is to provide the power equipment, wherein the electromagnetic relay of the power equipment has strong impact resistance and low power loss.

In order to achieve the above object, an aspect of the present utility model provides an electromagnetic relay comprising:

a coil;

the movable iron core can move up and down along with the excitation and the demagnetization of the coil;

the movable iron core is sleeved on the push rod, and the lower end of the push rod is connected with the movable iron core;

a first binding post and a second binding post;

the upper end of the push rod is provided with the movable contact plate, the push rod and the movable contact plate can move between a first position and a second position under the drive of the movable iron core, the first binding post and the second binding post are electrically connected through the movable contact plate in the state that the movable iron core is positioned at the first position, and the first binding post and the second binding post are electrically disconnected in the state that the movable iron core is positioned at the second position; and

and the magnetic element is arranged below the movable contact plate and can attract the movable iron core.

Specifically, the magnetic element is a magnet.

Specifically, in the case where the movable iron core is in the second position, the magnetic field strength of the magnetic element is set to a first set magnetic field strength, the distance between the movable iron core and the magnetic element is set to a first predetermined distance, and the magnetic element is capable of attracting the movable iron core by magnetic force so that the movable iron core can maintain a position unchanged with respect to the magnetic element under the action of an impact force within a predetermined impact force.

Preferably, the method further comprises: the static iron core is sleeved on the push rod, a spring cavity is formed between the static iron core and the push rod, the return spring is arranged in the spring cavity, one end of the return spring is supported on the movable iron core, and the other end of the return spring is propped against a stop step surface of the spring cavity.

In particular, in the case where the movable iron core is in the second position, the magnetic field strength of the magnetic element is set to a second set magnetic field strength, the distance between the movable iron core and the magnetic element is set to a second set distance, and the magnetic element and the return spring apply downward force to the movable iron core so that the movable iron core can maintain a position unchanged with respect to the magnetic element under the action of an impact force within a predetermined impact force.

Preferably, a spring groove is formed on the push rod, the spring groove is arranged between the static iron core and the movable contact plate, the electromagnetic relay further comprises a buffer spring, the buffer spring is arranged between the movable contact plate and the spring groove, the movable contact plate is sleeved on the push rod, a flange limiting part is formed at the upper end of the push rod, a flange stop part is formed on the movable contact plate, the elastic force of the buffer spring acts on the movable contact plate when the movable iron core is in the second position, the flange limiting part and the flange stop part are mutually stopped, and the distance between the first binding post, the second binding post and the movable contact plate is smaller than the distance between the static iron core and the movable iron core.

The magnetic element fixing device comprises a movable iron core, and is characterized by further comprising an upper shell and a lower shell, wherein a fixing cavity for fixing the magnetic element is formed in the position, corresponding to the movable iron core, of the bottom of the lower shell.

Preferably, a first yoke and a second yoke are provided inside the lower case, and the first yoke and the second yoke are capable of conducting magnetic lines of force of the coil.

Preferably, the upper shell is lined with a ceramic shell, a sealing cavity is formed in the ceramic shell, and the first binding post, the second binding post, the movable contact plate and the buffer spring are arranged in the sealing cavity.

On the basis of the technical scheme of the electromagnetic relay, the utility model further provides power equipment, and the power equipment comprises the electromagnetic relay of any technical scheme.

Through the technical scheme, the electromagnetic relay provided by the utility model has the advantages that the magnetic element is arranged to attract the movable iron core, so that the electromagnetic relay can not generate misoperation under the action of external impact force when the coil is not excited, and the impact resistance and the safety of the electromagnetic relay are further improved. In addition, the shock resistance of the electromagnetic relay is improved by increasing the spring constant of the return spring in the prior art, and in the process of upward movement of the movable contact plate in normal operation, the coil needs to generate larger magnetic force to drive the movable iron core to move upward along with the compression of the return spring because the spring constant is increased, so that larger electric energy loss is caused by providing larger current for the coil.

Additional features and advantages of the utility model will be set forth in the detailed description which follows.

Drawings

Fig. 1 is a plan view of an electromagnetic relay according to an embodiment of the present utility model

Fig. 2 is a sectional view at I-I of an electromagnetic relay according to an embodiment of the present utility model.

Fig. 3 is a sectional view at J-J of an electromagnetic relay according to an embodiment of the present utility model.

Fig. 4 is a top view of a lower housing of an electromagnetic relay according to an embodiment of the present utility model.

Fig. 5 is a sectional view at K-K of a lower case of an electromagnetic relay according to an embodiment of the present utility model.

Description of the reference numerals

1 coil 2 movable iron core

3 push rod 4 first binding post

5 second binding post 6 movable contact plate

7 magnet 8 static iron core

9 reset spring 10 spring cavity

11 stop step surface 12 upper shell

13 lower shell 14 fixing cavity

15 spring groove 16 buffer spring

17 flange limit 18 flange stop

19 first yoke 20 second yoke

21 ceramic shell 22 seal cavity

Detailed Description

The following describes specific embodiments of the present utility model in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the utility model, are not intended to limit the utility model.

In the present utility model, unless otherwise indicated, terms such as "first," "second," and the like are used for distinguishing one element from another, and are not necessarily for describing a sequential or important aspect, but rather are not intended to limit the scope of the present utility model. The azimuth words such as "up and down" are used specifically with the direction in which the centroid of the electromagnetic relay points to the movable contact plate being up and the direction in which the centroid of the electromagnetic relay points to the magnet being down. "inner and outer" refer to the inner and outer of the contour of the associated component. It should be noted that the magnetic element mentioned in the present application may be a permanent magnet or a soft magnet, and the present application mainly uses the magnet 7 as an example, which is only for convenience of description, and does not limit the scope of protection.

As shown in fig. 2, the electromagnetic relay provided by the present utility model includes: a coil 1; the movable iron core 2 can move up and down along with the excitation and demagnetization of the coil 1; the push rod 3, the movable iron core 2 is sleeved on the push rod 3, the lower end of the push rod 3 is connected with the movable iron core 2; a first terminal 4 and a second terminal 5; the upper end of the push rod 3 is provided with a movable contact plate 6, the push rod 3 and the movable contact plate 6 can move between a first position and a second position under the drive of the movable iron core 2, the first binding post 4 and the second binding post 5 are electrically connected through the movable contact plate 6 in the state that the movable iron core 2 is positioned at the first position, and the electrical connection between the first binding post 4 and the second binding post 5 is disconnected in the state that the movable iron core 2 is positioned at the second position; and a magnetic element capable of attracting the plunger 2 so that the plunger maintains a position with respect to the magnetic element when receiving an impact force within a predetermined impact force. It will be apparent to those skilled in the art that the attraction force of the magnetic element to the plunger 2 can be adjusted to adjust the predetermined impact force to meet the actual needs. When the coil 1 is powered off, and the electromagnetic relay bears external impact force along the axial direction of the push rod 3, the magnetic element can attract the movable iron core 2, so that the movable iron core 2 overcomes the external impact force, the movable iron core 2 is prevented from moving to the first position under the action of the external impact force to guide the movable contact plate 6 to connect the first binding post 4 and the second binding post 5, and misoperation of electrical equipment on the working circuit caused by wrong conduction of the working circuit of the electromagnetic relay is avoided, and the impact resistance, safety and reliability of the electromagnetic relay are improved. When the coil 1 gets electricity, the coil 1 generates magnetic force to overcome the downward magnetic force of the magnetic element to the movable iron core 2 and the gravity of the movable iron core 2, the movable iron core 2 is driven to move upwards, the lower end of the push rod 3 is connected with the movable iron core 2, so that the movable contact plate 6 connected with the movable iron core 2 is driven to move upwards to a first position, the movable contact plate 6 reaches the first position and then is connected with the first binding post 4 and the second binding post 5, so that the working circuit of the electromagnetic relay is conducted, and the magnetic element reduces the downward magnetic force to the movable iron core 2 along with the upward movement of the movable iron core 2, so that the electric energy required to be consumed by the conducting working circuit of the electromagnetic relay is reduced. When the coil 1 is powered off, the coil 1 is demagnetized, the movable iron core 2 moves downwards under the action of gravity to drive the push rod 3 and the movable contact plate 6 to move downwards, and finally the movable contact plate 6 returns to the second position, the electric connection between the first binding post 4 and the second binding post 5 is disconnected, and the working circuit of the electromagnetic relay is disconnected.

As a specific embodiment, the magnetic element is a magnet 7, and when the movable iron core 2 is in the second position, the magnetic field strength of the magnet 7 is set to a first set magnetic field strength, the distance between the movable iron core 2 and the magnet 7 is set to a first predetermined distance, and the magnet 7 can attract the movable iron core 2 by magnetic force, so that the movable iron core 2 can keep the position unchanged relative to the magnet 7 under the action of an impact force within a predetermined impact force. It will be apparent to those skilled in the art that the first predetermined distance and the first set magnetic field strength are adjusted according to specific impact resistance requirements, and thus, the first predetermined distance and the first set magnetic field strength may take various values, which are all within the scope of the present utility model.

As a preferred embodiment, as shown in fig. 2 and 3, the electromagnetic relay further includes: the device comprises a static iron core 8 and a return spring 9, wherein the static iron core 8 is sleeved on a push rod 3, a spring cavity 10 is formed between the static iron core 8 and the push rod 3, the return spring 9 is arranged in the spring cavity 10, one end of the return spring 9 is supported on a movable iron core 2, and the other end of the return spring is abutted against a stop step surface 11 of the spring cavity 10. When the coil 1 is powered off and the electromagnetic relay bears external impact force along the axial direction of the push rod 3, the magnet 7 applies downward magnetic force to the movable iron core 2, and the return spring 9 applies downward force to the movable iron core 2, so that the movable iron core 2 overcomes the external impact force within the preset impact force and keeps unchanged position relative to the magnet 7, the movable iron core 2 is prevented from moving to the first position under the action of the external impact force to guide the movable contact plate 6 to connect the first binding post 4 and the second binding post 5, and misoperation of electrical equipment on the working circuit caused by erroneous conduction of the working circuit of the electromagnetic relay is avoided, and the impact resistance, safety and reliability of the electromagnetic relay are improved. When the coil 1 is powered on, the coil 1 generates magnetic force to overcome the downward force applied by the magnet 7 and the return spring 9 to the movable iron core 2 and the gravity of the movable iron core 2, the movable iron core 2 is driven to move upwards, the lower end of the push rod 3 is connected with the movable iron core 2, so that the movable contact plate 6 connected with the movable iron core 2 is driven to move to a first position, the movable contact plate 6 reaches the first position and then is connected with the first binding post 4 and the second binding post 5, so that the working circuit of the electromagnetic relay is conducted, and compared with the prior art, the impact resistance of the electromagnetic relay is increased by increasing the spring constant of the return spring 9, the electromagnetic relay of the utility model increases the impact resistance of the electromagnetic relay by matching the return spring 9 with the magnet 7, and the magnetic force of the magnet 7 is the main impact resistance source, so that the spring constant of the return spring 9 is smaller than that in the prior art, the magnetic force required to be provided by the coil 1 is less in the compression process of the return spring 9, the magnetic force required by the movable contact plate 6 is connected with the movable iron core 2 after reaching the first position, so that the working circuit of the electromagnetic relay is conducted, the magnetic force required by the coil 1 is further reduced, and the working circuit is further reduced, and the working loss is further reduced. When the coil 1 is powered off, the coil 1 is demagnetized, the movable iron core 2 moves downwards under the action of the elastic restoring force of the restoring spring 9 to drive the push rod 3 and the movable contact plate 6 to move downwards, so that the movable contact plate 6 quickly returns to the second position, the electric connection between the first binding post 4 and the second binding post 5 is disconnected, and the working circuit of the electromagnetic relay is disconnected.

As a specific embodiment, as shown in fig. 2 and 3, in the case where the movable iron core 2 is in the second position, the magnetic field strength of the magnet 7 is set to the second set magnetic field strength, and the distance between the movable iron core 2 and the magnet 7 is set to the second set distance, so that when the coil 1 is deenergized, the movable iron core 2 is acted by an external impact force, and downward force is applied to the movable iron core 2 through the magnet 7 and the return spring 9 to overcome the external impact force, so that the movable iron core 2 can maintain the position unchanged relative to the magnet 7 under the impact force within the predetermined impact force, and further the electromagnetic relay has better impact resistance. When the working circuit of the electromagnetic relay is required to be changed from on to off, the return spring 9 can apply downward force to the movable iron core 2, so that the movable contact plate 6 is driven by the push rod 3 to be separated from the first binding post 4 and the second binding post 5, and the return spring 9 can be arranged between the movable contact plate 6 and the first binding post 4 and the second binding post 5. And when the coil 1 is energized, the attraction force of the magnet 7 to the movable iron core 2 gradually decreases as the movable iron core 2 moves toward the first position under the action of the coil 1. The spring constant of the return spring 9 is set to a larger value in order to increase the anti-roll ability as compared to when the return spring 9 alone is used, resulting in a gradual increase in the downward force of the return spring 9 on the plunger 2 as the plunger 2 moves toward the first position. The electromagnetic relay consumes less power in the process of triggering the working circuit to conduct. More specifically, as shown in fig. 4 and 5, the electromagnetic relay further includes an upper case 12 and a lower case 13, wherein a fixing cavity 14 for fixing the magnet 7 is provided at a portion of the bottom of the lower case 13 corresponding to the movable iron core 2, that is, the fixing cavity 14 is provided directly under the movable iron core 2 in a preferable real-time manner, and the thickness of the upper wall of the fixing cavity 14 is a second set distance. The movable iron core 2 is abutted against the upper wall surface of the fixed chamber 14 under the elastic force of the return spring 9 when in the second position because the thickness of the upper wall of the fixed chamber 14 is a second predetermined distance, and the magnet 7 is fixed in the fixed chamber 14, at which time the distance between the magnet 7 and the movable iron core 2 is the second predetermined distance and the magnetic field strength of the magnet 7 is set to the second predetermined magnet strength, so that the movable magnet 2 can maintain the position relative to the magnet 7 against the external impact force within the predetermined impact force. It will be apparent to those skilled in the art that the second predetermined distance and the second set magnetic field strength are adjusted according to specific impact resistance requirements, and thus the second predetermined distance and the second set magnetic field strength may take various values, which are all within the scope of the present utility model.

As a preferred embodiment, as shown in fig. 2 and 3, a spring groove 15 is formed on the push rod 3, the spring groove 15 is provided between the stationary core 8 and the movable contact plate 6, the electromagnetic relay further includes a buffer spring 16, the buffer spring 16 is provided between the movable contact plate 6 and the spring groove 15, the movable contact plate 6 is sleeved on the push rod 3, a flange limit portion 17 is formed at the upper end of the push rod 3, the movable contact plate is formed with a flange limit portion 18, in a state in which the movable core 2 is in the second position, the elastic force of the buffer spring 16 acts on the movable contact plate 6 such that the flange limit portion 17 and the flange limit portion 18 are stopped against each other, and the distance between the first terminal post 4, the second terminal post 5 and the movable contact plate 6 is smaller than the distance between the stationary core 8 and the movable core 2. When the coil 1 is electrified, the movable contact plate 6 is contacted with the first binding post 4 and the second binding post 5, the buffer spring 16 is compressed, so that the movable contact plate 6 is more stable in connection with the first binding post 4 and the second binding post 5, contact rebound caused by collision between the movable contact plate 6 and the first binding post 4 and the second binding post 5 is avoided, electric arcs are generated in a high-voltage or high-current working condition, the buffer spring 16 plays a role in buffering collision between the movable contact plate 6 and the first binding post 4 and between the buffer spring 16 and the second binding post 5, abrasion and deformation of components in the electromagnetic relay are avoided, reliability and stability of the electromagnetic relay are further improved, service life of the electromagnetic relay is prolonged, the buffer spring 16 is further compressed until the movable iron core 2 is limited by the static iron core 8, and at the moment, the movable contact plate 6 is more stable in connection with the first binding post 4 and the second binding post 5 under the action of the buffer spring 16, and reliability and stability of the electromagnetic relay are improved.

Further as a preferred embodiment, the lower housing 13 includes a first yoke 19 and a second yoke 20, and the first yoke 19 and the second yoke 20 are capable of conducting magnetic lines of force of the coil, thereby enhancing the strength of the magnetic field generated by the coil 3 and guiding the magnetic field to exert an upward force on the moving core 2. The upper shell 12 is lined with a ceramic shell 21, a sealing cavity 22 is formed inside the ceramic shell 21, the first binding post 4, the second binding post 5, the movable contact plate 6 and the buffer spring 16 are arranged in the sealing cavity 22, and inner components such as the movable contact plate 6, the first binding post 4 and the second binding post are sealed through the ceramic shell 21, so that the sealing performance of the electromagnetic relay is enhanced, and the functions of preventing the inner components from being oxidized and preventing moisture are achieved.

On the basis of the technical scheme, the utility model further provides an electric power device. The electromagnetic relay of the power equipment has stronger anti-impact capability, higher reliability, stability and longer service life.

As shown in fig. 2, the present utility model provides a preferred electromagnetic relay comprising: a coil 1; the movable iron core 2 can move up and down along with the excitation and demagnetization of the coil 1; the push rod 3, the movable iron core 2 is sleeved on the push rod 3, the lower end of the push rod 3 is connected with the movable iron core 2; the static iron core 8 is sleeved on the push rod 3, a spring cavity 10 is formed between the static iron core 8 and the push rod 3, and the static iron core 8 can limit the movable iron core 2; a return spring 9, the return spring 9 is arranged in the spring cavity 10, one end of the return spring 9 is supported on the movable iron core 2, and the other end of the return spring is abutted against a stop step surface 11 of the spring cavity 10; a first terminal 4 and a second terminal 5; the upper end of the push rod 3 is provided with a movable contact plate 6, the push rod 3 and the movable contact plate 6 can move between a first position and a second position under the drive of the movable iron core 2, the first binding post 4 and the second binding post 5 are electrically connected through the movable contact plate 6 in the state that the movable iron core 2 is positioned at the first position, and the electrical connection between the first binding post 4 and the second binding post 5 is disconnected in the state that the movable iron core 2 is positioned at the second position; the buffer spring 16 is formed on the push rod 3, the spring groove 15 is arranged between the static iron core 8 and the movable contact plate 6, the electromagnetic relay further comprises the buffer spring 16, the buffer spring 16 is arranged between the movable contact plate 6 and the spring groove 15, the movable contact plate 6 is sleeved on the push rod 3, a flange limiting part 17 is formed at the upper end of the push rod 3, a flange stop part 18 is formed on the movable contact plate, in the state that the movable iron core 2 is in the second position, the elastic force of the buffer spring 16 acts on the movable contact plate 6, so that the flange limiting part 17 and the flange stop part 18 mutually stop, and the distance between the first binding post 4, the second binding post 5 and the movable contact plate 6 is smaller than the distance between the static iron core 8 and the movable iron core 2; the upper shell 12 and the lower shell 13 are detachably connected, a fixed cavity 14 is formed in the position, corresponding to the movable iron core 2, of the bottom of the lower shell 13, the thickness of the upper wall of the fixed cavity 14 is a second set distance, a first magnetic yoke 19 and a second magnetic yoke 20 are arranged in the lower shell 13, the static iron core 8 is fixed through the second magnetic yoke 20, a ceramic shell 21 is lined in the upper shell 12, and a first binding post 4, a second binding post 5, a movable contact plate 6 and a buffer spring 16 are arranged in a sealing cavity 22; and a magnet 7, the magnet 7 is fixed in the fixed cavity 14, the magnetic field strength of the magnet 7 is set to be a second predetermined magnetic field strength, and the magnet 7 can attract the movable iron core 2. When the coil 1 is powered off, the axial direction of the push rod 3 bears the impact force from the outside, and at the moment, the magnet 7 applies downward magnetic force to the movable iron core 2 to cooperate with the reset spring 9 to apply downward elastic force to the movable iron core 2 to overcome the external impact force, so that the impact resistance of the electromagnetic relay is enhanced, and the reliability and stability of the electromagnetic relay are improved. When the coil 1 is powered on, the magnetic field force of the coil 1 is enhanced and conducted through the first magnetic yoke 19 and the second magnetic yoke 20 to drive the movable iron core 2 to move towards the first position against the resistance force exerted on the movable iron core 2 by the magnet 7 and the reset spring 9, and the magnetic force of the magnet 7 on the movable iron core 2 is gradually reduced in the process of moving the movable iron core 2 towards the first position, so that the power loss in the process of conducting an operating circuit by the electromagnetic relay is reduced. After the movable contact plate 6 is contacted with the first binding post 4 and the second binding post 5, the buffer spring 16 is compressed to provide buffer, so that the contact rebound caused by the impact of the movable contact plate 6 on the first binding post 4 and the second binding post 5 under the action of the magnetic force of the coil 1 is prevented, the electric arc is prevented from being generated in a high-voltage or high-current working condition, the problem that the contact surface caused by the electric arc is locally and rapidly melted and rapidly solidified to effectively break the movable contact plate 6 and the first binding post 4 and the second binding post 5 in the breaking process is avoided, and the safety and the reliability of the electromagnetic relay are improved. And the buffer spring 16 can play a role in buffering the impact, so that abrasion and deformation of components in the electromagnetic relay are reduced, and the service life of the electromagnetic relay is prolonged. The compression of the buffer spring 16 continues until the movable core 2 is restrained by the stationary core 8. At this time, the coil 1 is powered off, the movable iron core 2 moves to the second position under the action of the spring restoring force of the restoring spring 9, the movable iron core 2 drives the push rod 3 to move downwards, the flange limiting part 17 on the push rod 3 and the flange stop part 18 on the movable contact plate 6 are stopped mutually, so that the movable contact plate 6 is driven to be separated from the first binding post 4 and the second binding post 5, a working circuit of the electromagnetic relay is disconnected, the movable iron core 2 continues to move downwards until being stopped by the upper wall of the fixed cavity 14, at this time, the movable contact plate 6 returns to the second position, and the distance between the movable iron core 2 and the magnet 7 is the second set distance for the thickness of the upper wall of the fixed cavity 14. In addition, the upper shell and the lower shell are connected through a detachable structure, so that maintenance of the electromagnetic relay is facilitated. The first terminal 4, the second terminal 5, the movable contact plate 6 and the buffer spring 16 are disposed in the sealing chamber 22, and oxidation and moisture of components inside the electromagnetic relay are prevented, thereby increasing safety and reliability of the electromagnetic relay.

As can be seen from the above description, the present utility model has advantages in that, first, the impact resistance of the electromagnetic relay is increased by the magnetic element, thereby preventing malfunction of the electromagnetic relay under the action of external impact force, and further increasing the safety and reliability of the electromagnetic relay. Second, the electromagnetic relay of the present utility model improves the shock resistance through the magnet, and compared with the prior art, the electromagnetic relay improves the shock resistance through increasing the spring constant of the return spring, and the power loss in the normal operation triggering working circuit conducting process is less. Thirdly, the buffer spring can effectively prevent the movable contact and the fixed contact from jumping back, so that arc discharge of the movable contact and the fixed contact is avoided, and the safety and reliability of the electromagnetic relay are further improved. Fourth, the upper case is provided with a ceramic case to prevent oxidation and wetting of components inside the electromagnetic relay, thereby increasing the service life of the electromagnetic relay. Fifth, simple structure, upper and lower casing detachable connection, easy to carry out, easy to maintain.

The preferred embodiments of the present utility model have been described in detail above with reference to the accompanying drawings, but the present utility model is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present utility model within the scope of the technical concept of the present utility model, and all the simple modifications belong to the protection scope of the present utility model.

In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction. The various possible combinations of the utility model are not described in detail in order to avoid unnecessary repetition.

Moreover, any combination of the various embodiments of the utility model can be made without departing from the spirit of the utility model, which should also be considered as disclosed herein.

Claims (10)

1. An electromagnetic relay, characterized by comprising:

a coil (1);

the movable iron core (2) can move up and down along with the excitation and the demagnetization of the coil (1);

the movable iron core (2) is sleeved on the push rod (3), and the lower end of the push rod (3) is connected with the movable iron core (2);

a first binding post (4) and a second binding post (5);

the movable contact plate (6), the upper end of the push rod (3) is provided with the movable contact plate (6), the push rod (3) and the movable contact plate (6) can move between a first position and a second position under the drive of the movable iron core (2), the first binding post (4) and the second binding post (5) are electrically connected through the movable contact plate (6) in the state that the movable iron core (2) is in the first position, and the electrical connection between the first binding post (4) and the second binding post (5) is disconnected in the state that the movable iron core (2) is in the second position; and

and the magnetic element is arranged below the movable contact plate (6) and can attract the movable iron core (2).

2. The electromagnetic relay according to claim 1, characterized in that the magnetic element is a magnet (7).

3. The electromagnetic relay according to claim 1, characterized in that the magnetic field strength of the magnetic element is set to a first set magnetic field strength with the moving iron core (2) in the second position, the distance between the moving iron core (2) and the magnetic element is set to a first predetermined distance, the magnetic element being capable of attracting the moving iron core (2) by magnetic force such that the moving iron core (2) is capable of maintaining a position with respect to the magnetic element unchanged under the action of an impact force within a predetermined impact force.

4. The electromagnetic relay according to claim 1, further comprising: quiet iron core (8) and reset spring (9), quiet iron core (8) cover is established on push rod (3), quiet iron core (8) with be formed with spring chamber (10) between push rod (3), reset spring (9) set up in spring chamber (10), one end of reset spring (9) is supported on moving iron core (2), the other end supports and leans on backstop step face (11) in spring chamber (10).

5. The electromagnetic relay according to claim 4, characterized in that the magnetic field strength of the magnetic element is set to a second set magnetic field strength with the moving iron core (2) in the second position, the distance between the moving iron core (2) and the magnetic element is set to a second set distance, and the magnetic element and the return spring (9) exert a downward force on the moving iron core (2) so that the moving iron core (2) can maintain a position with respect to the magnetic element under the action of an impact force within a predetermined impact force.

6. The electromagnetic relay according to claim 4, characterized in that a spring groove (15) is formed in the push rod (3), the spring groove (15) is provided between the stationary iron core (8) and the movable contact plate (6), the electromagnetic relay further comprises a buffer spring (16), the buffer spring (16) is provided between the movable contact plate (6) and the spring groove (15), the movable contact plate (6) is sleeved on the push rod (3), a flange limit part (17) is formed at the upper end of the push rod (3), a flange stop part (18) is formed on the movable contact plate, and in the state that the movable iron core (2) is in the second position, the elastic force of the buffer spring (16) acts on the movable contact plate (6) so that the flange limit part (17) and the flange stop part (18) are mutually stopped, and the distance between the first binding post (4), the second binding post (5) and the stationary contact plate (6) is smaller than the distance between the stationary iron core (8) and the movable iron core (2).

7. The electromagnetic relay according to claim 1, further comprising an upper housing (12) and a lower housing (13), wherein a fixing cavity (14) for fixing the magnetic element is provided at a portion of a housing bottom of the lower housing (13) corresponding to the movable iron core (2).

8. The electromagnetic relay according to claim 7, characterized in that the lower housing (13) is internally provided with a first yoke (19) and a second yoke (20), the first yoke (19) and the second yoke (20) being capable of conducting magnetic lines of force of the coil.

9. The electromagnetic relay according to claim 7, characterized in that the upper housing (12) is lined with a ceramic housing (21), a sealing cavity (22) is formed inside the ceramic housing (21), and the first binding post (4), the second binding post (5), the movable contact plate (6) and the buffer spring (16) are arranged in the sealing cavity (22).

10. An electrical apparatus comprising an electromagnetic relay according to any one of claims 1 to 9 of the present application.