阅读说明：本技术 一种适用于磁场环境的直线式电磁继电器 (Linear electromagnetic relay suitable for magnetic field environment ) 是由 杨勇 王如梦 张明 于 2020-12-31 设计创作，主要内容包括：本发明公开了一种适用于磁场环境的直线式电磁继电器,包括外壳、线圈、铁芯、导轨、动作杆、弹簧、触点和磁场分流器；电磁继电器在铁芯周围缠绕铜导线来形成线圈,并在通电后生成驱动磁场,促使动作杆运动并接通触电。当外部干扰磁场较强时,现有电磁继电器会受到磁场干扰,干扰磁场会在继电器动作杆上产生与驱动线圈相反的力,进而影响电磁继电器的工作特性,使其误动作或不动作。本发明设计的直线式电磁继电器包括磁场分流器,磁场分流器会改变外磁场在继电器上的磁路结构,使干扰磁场对电磁继电器的作用力减小,进而提高电磁继电器对磁场的抗干扰能力。这种新型的电磁继电器具有抗干扰磁场效果好、结构简单、易加工等优点。(The invention discloses a linear electromagnetic relay suitable for a magnetic field environment, which comprises a shell, a coil, an iron core, a guide rail, an action rod, a spring, a contact and a magnetic field shunt, wherein the shell is provided with a magnetic pole; the electromagnetic relay winds a copper wire around the iron core to form a coil, and generates a driving magnetic field after being electrified, so that the action rod is driven to move and an electric shock is switched on. When an external interference magnetic field is strong, the conventional electromagnetic relay is interfered by the magnetic field, and the interference magnetic field generates a force opposite to a driving coil on a relay action rod, so that the working characteristic of the electromagnetic relay is influenced, and the electromagnetic relay is enabled to be in misoperation or non-action. The linear electromagnetic relay comprises a magnetic field shunt, wherein the magnetic field shunt can change a magnetic circuit structure of an external magnetic field on the relay, so that the acting force of an interference magnetic field on the electromagnetic relay is reduced, and the anti-interference capability of the electromagnetic relay on the magnetic field is further improved. The novel electromagnetic relay has the advantages of good anti-interference magnetic field effect, simple structure, easiness in processing and the like.)

1. A linear electromagnetic relay adapted for use in a magnetic field environment, comprising: a housing (101), a coil (102), a guide rail (103), an action rod (104), a spring (105), a contact (106) and a magnetic field shunt (107);

the housing (101) and the action rod (104) form a magnetic circuit for reducing leakage magnetic flux;

the coil (102) is arranged around the shell (101), and when the coil (102) is electrified, a magnetic field is generated around the coil, and a driving force is generated on the action rod (104) to move the action rod (104);

the guide rail (103) is used for limiting the motion track of the action rod (104) and reducing the friction resistance of the action rod (104);

the action rod (104) moves in the guide rail (103) under the action of electromagnetic force;

the spring (105) is arranged outside the action rod (104) and used for pushing the action rod (104) away from the contact (106) after the coil (102) is powered off to realize the opening action of the relay;

the contact (106) is used for enabling the contact (106) to be connected due to the movement of the action rod (104) after the coil (102) is electrified, so that the connection effect of a relay is realized;

the magnetic field shunt (107) is arranged at the extending position of the shell (101) and is used for realizing the shunt of the electromagnetic force of the external magnetic field in the relay by changing the magnetic circuit of the external magnetic field on the electromagnetic relay, thereby reducing the influence of the external magnetic field on the motion characteristic of the relay.

2. The linear electromagnetic relay of claim 1, wherein the magnetic field shunt (107) is of an "L" configuration for diverting the magnetic field away from the actuating rod (104) to further reduce the influence of the magnetic field on the electromagnetic relay.

3. The linear electromagnetic relay of claim 1, characterized in that the magnetic field shunt (107) is of a vertical type configuration.

4. Linear electromagnetic relay according to claim 3, characterized in that the magnetic field shunt (107) has a length of 30 mm.

5. Linear electromagnetic relay according to any of claims 1-4, characterized in that the material used for the magnetic field shunt (107) is a ferromagnetic material.

6. Linear electromagnetic relay according to any of claims 1-5, characterized in that the housing (101) is pressed from a pure iron material.

7. Linear electromagnetic relay according to any of claims 1-6, characterized in that the coil (102) is wound from copper wire.

8. Linear electromagnetic relay according to any of claims 1-7, characterized in that the action bar (104) is made of ferromagnetic material.

9. The linear electromagnetic relay according to any of claims 1-8, characterized in that the contact (106) is a microswitch of an electromagnetic relay.

Technical Field

The invention belongs to the technical field of electromagnetic compatibility, and particularly relates to a linear electromagnetic relay suitable for a magnetic field environment.

Background

The electromagnetic relay is an electronic control device based on a specially designed magnetic circuit structure and realizes circuit conversion by driving an armature to move by utilizing electromagnetic force or electromagnetic torque, and is widely applied to the aspects of automatic control, power protection, communication systems and the like. When the electromagnetic relay is located in an external magnetic field environment, the external magnetic field will generate additional electromagnetic force or electromagnetic torque on the armature, thereby affecting the dynamic characteristics of the electromagnetic relay. In large scientific research devices, such as tokamak and electromagnetic emission, strong space magnetic fields exist around the devices, and the influence is more obvious. Taking an international thermonuclear fusion experimental reactor plan (ITER) tokamak device as an example, when the electromagnetic relay is in rated operation, a very strong steady-state magnetic field is generated around the electromagnetic relay, wherein the radius of a 50mT magnetic field contour line is more than 25m, the existence of a strong magnetic field for normal operation of the electromagnetic relay arranged around the electromagnetic relay is seriously influenced, so that the electromagnetic relay fails, the failure of the relay can cause a control system where the relay is positioned to break down, and the safety and reliability of the system where the relay is positioned are threatened, so that the invention of the electromagnetic relay suitable for a magnetic field environment is urgently needed.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide a linear electromagnetic relay suitable for a magnetic field environment, and aims to solve the problem that the conventional electromagnetic relay fails under a magnetic field and cannot normally work under a strong magnetic field environment.

The invention provides a linear electromagnetic relay suitable for magnetic field environment, comprising: the device comprises a shell, a coil, a guide rail, an action rod, a spring, a contact and a magnetic field shunt; the shell and the action rod form a magnetic circuit for reducing leakage magnetic flux; the coil is arranged around the shell, and when the coil is electrified, a magnetic field is generated around the coil, and a driving force is generated on the action rod to drive the action rod to move; the guide rail is used for limiting the motion track of the action rod and reducing the friction resistance of the action rod; the action rod moves in the guide rail under the action of electromagnetic force; the spring is arranged outside the action rod and used for pushing the action rod away from the contact after the coil is powered off to realize the disconnection effect of the relay; the contact is used for switching on the contact due to the movement of the action rod after the coil is electrified, so that the switching-on function of the relay is realized; the magnetic field shunt can be arranged at the extending part of the shell and used for realizing the shunt of the electromagnetic force of the external magnetic field in the relay by changing the magnetic circuit of the external magnetic field on the electromagnetic relay, thereby reducing the influence of the external magnetic field on the motion characteristic of the relay.

As an embodiment of the present invention, the magnetic field shunt may be configured to have an "L" shape, and is used to separate the drained magnetic field from the actuating rod, so as to further reduce the influence of the magnetic field on the electromagnetic relay.

As another embodiment of the present invention, the magnetic field shunt may also be provided in a vertical type configuration. Wherein the length of the magnetic field shunt may be 30 mm.

Furthermore, the magnetic field shunt is made of ferromagnetic materials; the shell is formed by pressing pure iron materials; the action rod is made of ferromagnetic material; the coil is formed by winding a copper wire.

Still further, the contact may be a microswitch of an electromagnetic relay.

The invention can solve the problem that the electromagnetic relay fails under the magnetic field, and enhance the capacity of the electromagnetic relay for resisting the magnetic field interference; the improvement on the electromagnetic relay is small, the material consumption is less, and the improved electromagnetic relay can realize mass production. In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:

(1) reliability: the magnetic field shunt is designed to effectively reduce the magnetic flux of an external magnetic field passing through the action rod, so that the electromagnetic relay is not easily influenced by the magnetic field to make wrong actions.

(2) The economic efficiency is as follows: compared with the traditional magnetic field shielding box, the magnetic field shunt has less material consumption, and can be integrally manufactured with the iron core of the electromagnetic relay due to the consistency with the material of the iron core, so that the manufacturing cost is reduced.

(3) Convenience: the traditional electromagnetic shielding box needs to consider the problem of size matching between the box and the relay and the problem of wiring of the relay, so that a lot of inconvenience exists; the electromagnetic relay provided by the invention can effectively avoid the problems through an integrated structural design.

(4) Universality: the magnetic field shunt in the present invention is not limited to a specific type of electromagnetic relay, and is applicable to all types of electromagnetic relays.

(5) High applicability: the magnetic field shunt can adjust the size of the specification of the magnetic field shunt according to the actual size of the electromagnetic relay, and the size of the magnetic field shunt is positively correlated with the size of the electromagnetic relay. The magnetic field shunt can also be adjusted according to the magnetic field environment, and the size of the magnetic field shunt is positively correlated with the size of the magnetic field.

Drawings

Fig. 1 is a structural view of an electromagnetic relay provided in a first embodiment of the present invention;

fig. 2 is a structural view of an electromagnetic relay provided in a second embodiment of the present invention;

fig. 3 is a schematic diagram of distribution of magnetic lines of force in a conventional linear electromagnetic relay;

fig. 4 is a schematic diagram illustrating distribution of magnetic lines of force in a linear electromagnetic relay provided in an embodiment of the present invention;

FIG. 5 is a schematic diagram of stress curves of a conventional electromagnetic relay and an electromagnetic relay provided by the present invention under magnetic fields of different strengths;

fig. 6 is a schematic diagram of a guide magnetic field of an electromagnetic relay according to a second embodiment of the present invention;

fig. 7 is a schematic diagram of stress curves of a conventional electromagnetic relay and an electromagnetic relay provided by the present invention under magnetic fields of different strengths.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The invention adopts the technical means of additionally arranging the magnetic field shunt on the linear electromagnetic relay, solves the technical problem of misoperation or non-operation of the linear electromagnetic relay under the magnetic field, and achieves the technical effect of enhancing the anti-magnetic field interference capability of the linear electromagnetic relay.

The invention provides a linear electromagnetic relay suitable for magnetic field environment, comprising: a housing 101, a coil 102, a guide rail 103, an action lever 104, a spring 105, a contact 106, and a magnetic field shunt 107; the housing 101 is made of a pure iron material by pressing, and is aimed at forming a magnetic circuit with the actuating rod 104 to reduce leakage flux; meanwhile, the case 101 also has a function of protecting the coil.

The coil 102 is formed by winding a copper wire, and is wrapped around the case 101. When the coil 102 is energized, a magnetic field generated around the coil generates a driving force on the operating rod 104, and the operating rod 104 is moved.

The guide rail 103 is intended to define the movement locus of the action lever 104 while reducing the frictional resistance of the action lever 104.

The operating rod 104 is made of a ferromagnetic material and moves in the guide rail 103 by an electromagnetic force.

The spring 105 is wrapped around the actuating rod 104, and is used for pushing the actuating rod 104 away from the contact 106 to achieve the opening function of the relay after the coil 102 is de-energized.

The contact 106 is a microswitch of an electromagnetic relay. When the coil 102 is energized, the actuating rod 104 moves and closes the contact 106, thereby effecting the closing action of the relay.

The magnetic field shunt 107 is made of a ferromagnetic material and is arranged at the electromagnetic relay housing extension. The magnetic field shunt 107 is used for shunting the electromagnetic force of the external magnetic field in the relay by changing the magnetic circuit of the external magnetic field on the electromagnetic relay, so that the influence of the external magnetic field on the motion characteristic of the relay is reduced.

In an embodiment of the present invention, the end of the magnetic shunt 107 may be perforated to facilitate a secure mounting during use.

In the embodiment of the present invention, the magnetic field shunt 107 is not only suitable for the above electromagnetic relay, but also can reduce the influence of the external magnetic field on the electromagnetic relay by adding the magnetic field shunt 107 for any structure of the electromagnetic relay.

In the embodiment of the present invention, the magnetic field shunt 107 is not only the one type provided in fig. 1, but also a device similar to such an extended shunt magnetic field property belongs to the magnetic field shunt, and fig. 2 shows the structure of another type of magnetic field shunt.

When the relay normally works, since the action rod 104 is made of ferromagnetic material, namely electrician pure iron, and the magnetic permeability of the pure iron is larger than that of air, most of the magnetic field generated by the coil 102 can pass through the action rod 104; the action rod 104 moves upwards to the contact 106 under the action of the magnetic field, stops moving when the action rod 104 contacts the contact 107 and is attracted to the contact 106 under the action of the electromagnetic field, so that the circuit state is switched; when the coil 102 is not electrified, the action rod 104 is acted by the counterforce of the spring 105, and is quickly disconnected, and the reverse motion returns to the initial position.

However, in the magnetic field environment, the operating rod 104 is interfered by the magnetic field, and the external magnetic field generates a force opposite to the normal movement on the operating rod 104 of the relay in order to form a magnetic circuit with the lowest magnetic resistance, and the direction of the force is opposite to the electromagnetic force generated by the coil, so that the movement of the operating rod 104 towards the contact 106 is blocked, and the normal operation of the electromagnetic relay is influenced.

And through setting up magnetic field shunt 107, through changing the magnetic circuit of external magnetic field on electromagnetic relay, realize the reposition of redundant personnel of external magnetic field in the relay internal electromagnetic force, and then reduced the interference of external magnetic field, effectively improved electromagnetic relay anti magnetic field interference ability.

To further illustrate the linear electromagnetic relay suitable for magnetic field environment provided by the embodiment of the present invention, the following is detailed with reference to the accompanying drawings and specific examples:

fig. 1 is a schematic structural diagram of a first embodiment of an electromagnetic relay provided by the present invention, the electromagnetic relay includes a housing 101, a coil 102, a guide rail 103, an actuating rod 104, a spring 105, a contact 106, and a magnetic field shunt 107; the shell 101 is in a through cube shape, and the contact 106 is positioned at the upper end inside the shell 101; the coil 102 is wrapped in the casing 101, the guide rail 103 is in a hollow cylindrical shape, the coil 102 surrounds the guide rail 103, and the action rod 104 is arranged inside the guide rail 103. The coil is connected to a power source, and when energized, the coil 102 generates a magnetic field that creates an attractive force between the actuating rod 104 and the housing 101, causing the actuating rod 104 to accelerate upward away from the spring, creating a magnetic flux path of lowest reluctance when the actuating rod 104 touches the contact 106. The magnetic field shunts 107 are disposed at the lower two sides of the housing 101 because (1) the actuating rod 104 is required to perform a piston movement, so that a part of the actuating rod 104 is exposed outside the housing, the magnetic field shunts 107 are made of ferromagnetic material, and the magnetic field shunts 107 disposed at the lower side of the housing 101 can reduce the direct action of the external magnetic field on the actuating rod 104; (2) the external magnetic field around the action rod is guided out. When the magnetic field splitter 107 is not provided, since a magnetic circuit with the lowest magnetic resistance is to be formed, the external magnetic field inside the relay is shown by a dotted line in fig. 3, and the magnetic field flows through the housing 101 and then flows to the action lever. The relay to which the magnetic shunt 107 is added is influenced by the magnetic field as shown by the broken line in fig. 4, and the magnetic field is reduced in influence on the operating rod 104 by the magnetic shunt 107.

In the present embodiment, the magnetic shunt 107 is provided in an "L" shape, and the "L" shape is designed to further reduce the influence of the magnetic field on the electromagnetic relay by separating the drawn magnetic field from the operating rod 104.

The dimensions of the housing 1 can be 52mm × 42mm × 48mm, the actuating rod 2 can be a cylinder with a radius of 5mm and a length of 48mm, the number of turns of the coil 3 is 200, the magnetic field splitter 6 in this embodiment is designed as an "L" structure with a vertical length of 30mm, a horizontal length of 20mm and a thickness of 5mm, and the housing 1, the actuating rod 2 and the magnetic field splitter 6 are all made of ferromagnetic materials.

The external magnetic field can generate a force opposite to the normal movement of the linear electromagnetic relay on the linear electromagnetic relay to block the movement of the linear electromagnetic relay. Fig. 5 shows the stress of the conventional electromagnetic relay and the electromagnetic relay provided by the present invention under magnetic fields with different strengths, and it can be seen from the graph that the magnetic field force of the relay provided by the present invention is much smaller than that of the conventional electromagnetic relay, and with the enhancement of the magnetic field, the difference is further increased, and the electromagnetic relay designed by the present invention is reduced by about 82% compared with the electromagnetic force generated by the magnetic field of the conventional relay, which means that the electromagnetic relay provided by the present invention can effectively reduce the influence of the external magnetic field.

Fig. 2 is a schematic structural diagram of a second embodiment of the electromagnetic relay provided by the present invention, the structure of the relay body is the same as that of the first embodiment, and the difference lies in the style of the magnetic field shunt, in this example, the magnetic field shunt is arranged in a vertical type, the length is 30mm, the schematic diagram of the magnetic field diversion is shown in fig. 6, wherein the dotted line represents the magnetic line, as can be seen from the figure, the vertical type magnetic field shunt also has the functions of shielding and magnetic field diversion, and since the derived magnetic field is parallel to the action rod, the effect of reducing the magnetic field interference is slightly weaker than that of the "L" type magnetic field shunt, and the electromagnetic relay can be used in the environment with less interfering magnetic field intensity, but the electromagnetic relay with the structure has smaller space occupation ratio, less material consumption and stronger economy. Fig. 7 shows the stress of the conventional electromagnetic relay and the electromagnetic relay provided by the present invention under magnetic fields with different strengths, and it can be seen from the graph that compared with the conventional electromagnetic relay, the electromagnetic relay provided by the present invention has stronger magnetic field resistance, the magnetic field shunt of the structure reduces the acting force of the magnetic field on the relay by 60%, compared with the first embodiment, the electromagnetic relay has less material consumption, is more economical, and is suitable for an environment with a smaller magnetic field.

It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.