CN212297854U

CN212297854U - Electromagnetic valve

Info

Publication number: CN212297854U
Application number: CN202022444408.1U
Authority: CN
Inventors: 竺开明
Original assignee: Ningbo Dongfang Jinfeng Machinery Co ltd
Current assignee: Ningbo Dongfang Jinfeng Machinery Co ltd
Priority date: 2020-10-29
Filing date: 2020-10-29
Publication date: 2021-01-05
Anticipated expiration: 2030-10-29

Abstract

The utility model discloses a solenoid valve, which comprises a valve body and a pilot head assembly arranged on the valve body, wherein the pilot head assembly comprises a magnetism isolating pipe, a static iron core, a movable iron core spring, a coil assembly, a movable permanent magnet and a fixed permanent magnet; the bottom of the magnetism isolating pipe is fixedly connected with the valve body through a valve seat, the static iron core is fixedly arranged at the top of the magnetism isolating pipe, the movable iron core is movably arranged in the magnetism isolating pipe, and the coil assembly is sleeved outside the magnetism isolating pipe; be provided with the magnetism shield in the quiet iron core, the activity of activity permanent magnet sets up in the inside of magnetism shield, moves the iron core spring and supports and locate the activity permanent magnet and move between the iron core, and fixed permanent magnet is fixed in the top of quiet iron core. The utility model has the advantages of simple and reasonable structure, response speed is very fast, and the working property is reliable and stable, and life is longer.

Description

Electromagnetic valve

Technical Field

The utility model relates to a pneumatic element technical field, in particular to solenoid valve.

Background

The electromagnetic valve is one of common pneumatic elements, and is widely applied to automatic control in various industries. The electromagnetic valves are various in types and different in structure, such as a two-position two-way electromagnetic valve, a two-position three-way electromagnetic valve, a two-position five-way electromagnetic valve and the like.

Take a two-position three-way electromagnetic valve as an example. The basic structure of the two-position three-way electromagnetic valve mainly comprises a valve body and a pilot head assembly, wherein the valve body is provided with a valve cavity, an air inlet, a working port and a valve port, the air inlet is directly communicated with the valve cavity, the working port is communicated with the valve cavity through the valve port, the pilot head assembly comprises a magnetism isolating pipe, a static iron core, a movable iron core and a coil assembly, the magnetism isolating pipe is fixedly connected with the valve body through a valve seat, the static iron core is fixedly arranged inside the magnetism isolating pipe, the static iron core is provided with a balance channel communicated with the atmosphere, the movable iron core is movably arranged inside the magnetism isolating pipe, a movable iron core spring is arranged between the movable iron core and the magnetism isolating.

When the coil assembly is powered off, one end of the movable iron core is in sealing contact with the valve port under the action of the elastic force of the movable iron core spring, the other end of the movable iron core is far away from the balance channel, the air inlet, the valve cavity and the balance channel are sequentially communicated at the moment, and the working port is in a closed state; when the coil assembly is electrified, the coil assembly generates electromagnetic suction force, so that the movable iron core overcomes the elasticity of the movable iron core spring and moves towards the direction of the static iron core, the movable iron core is separated from the valve port, the movable iron core is changed into a mode of plugging the balance channel, at the moment, the air inlet, the valve cavity, the valve port and the working port are sequentially communicated, and the balance channel is in a closed state.

At present, two-position three-way solenoid valve all adopts the movable iron core spring to provide pressure for the movable iron core, however, the defect of this kind of structure lies in: after the electromagnetic valve works for a long time, stress fatigue easily occurs to the movable iron core spring, so that the problem of insufficient resilience is caused, sufficient resilience pressure cannot be provided for the movable iron core, the movable iron core cannot rapidly plug the valve port when the coil assembly is powered off, and even the defect that the valve port is not sealed tightly is caused, so that the normal work of the electromagnetic valve is influenced.

There is a need for improvements in the prior art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to prior art's defect with not enough, provide a simple structure reasonable solenoid valve, its response speed is very fast, and the working property is reliable and stable, and life is longer.

In order to achieve the above purpose, the utility model adopts the following technical scheme.

A solenoid valve comprises a valve body and a pilot head assembly arranged on the valve body, wherein the valve body is respectively provided with a valve cavity, an air inlet, a working port and a valve port, the air inlet is directly communicated with the valve cavity, the working port is communicated with the valve cavity through the valve port, and the pilot head assembly comprises a magnetism isolating pipe, a static iron core, a movable iron core spring, a coil assembly, a movable permanent magnet and a fixed permanent magnet;

the bottom of the magnetism isolating pipe is fixedly connected with the valve body through a valve seat, the static iron core is fixedly arranged at the top of the magnetism isolating pipe, the movable iron core is movably arranged in the magnetism isolating pipe, the static iron core is in a hollow arrangement which is through along the axial direction, the upper end of the movable iron core is in sealing fit with the lower end face of the static iron core, the lower end of the movable iron core extends into the valve cavity and is in sealing fit with the valve port, and the coil assembly is sleeved outside the magnetism isolating pipe; a magnetism isolating sleeve is arranged in the static iron core, the movable permanent magnet is movably arranged in the magnetism isolating sleeve, the movable iron core spring is abutted between the movable permanent magnet and the movable iron core, and the fixed permanent magnet is fixed at the top of the static iron core; the movable permanent magnet and the fixed permanent magnet are both arranged in a hollow way and are communicated along the axial direction; the homopolar of fixed permanent magnet and activity permanent magnet is relative setting, the magnetic pole direction that coil pack circular telegram produced is the same with the magnetic pole direction of activity permanent magnet.

Further, the periphery of the fixed permanent magnet is covered with a protective cover, and the protective cover is fixedly connected with the static iron core through threads.

Further, the upper end of the movable iron core is provided with an upper plug head which is in sealing fit with the lower end face of the static iron core, and the movable iron core spring is abutted between the upper plug head and the movable permanent magnet.

Furthermore, a frustum corresponding to the movable iron core extends towards the valve cavity from the periphery of the valve port, and a lower plug head in sealing fit with the frustum is arranged at the lower end of the movable iron core.

Furthermore, the bottom of the magnetism isolating pipe is inserted into the valve body, and a sealing ring is embedded between the outer wall of the bottom of the magnetism isolating pipe and the inner wall of the valve cavity.

Furthermore, the side wall of the valve body is also provided with a manual rod correspondingly matched with the lower end of the movable iron core.

The utility model has the advantages that: the utility model provides a solenoid valve, which is essentially a normally closed two-position three-way solenoid valve, and is characterized in that a pilot head assembly is arranged and is formed by matching a magnetism isolating pipe, a static iron core, a movable iron core spring, a coil assembly, a magnetism isolating sleeve, a movable permanent magnet, a fixed permanent magnet and the like, the homopolar poles of the fixed permanent magnet and the movable permanent magnet are opposite, so that the fixed permanent magnet always generates vertical and downward repulsive force to the movable permanent magnet, when the coil assembly is in a power-off state (namely a normal state), at the moment, the movable permanent magnet presses the movable iron core spring down under the action of the repulsive force of the fixed permanent magnet, the movable iron core spring further presses the movable iron core down, so that the lower end of the movable iron core is in sealed contact with the valve port, the upper end of the movable iron core is separated from the static iron core, the working port is in a closed state at the moment, and gas in the valve cavity is exhausted to the atmosphere through a hollow channel formed by matching the static iron core, the movable permanent magnet and the fixed permanent magnet; when the coil assembly is in a power-on state, the coil assembly generates electromagnetic suction, the movable permanent magnet overcomes the repulsive force of the fixed permanent magnet to move upwards, the movable iron core also overcomes the elastic force of the movable iron core spring to move upwards, the lower end of the movable iron core is separated from the valve port, the upper end of the movable iron core is in sealed contact with the lower end of the fixed iron core, and at the moment, gas in the valve cavity is discharged to the working port through the valve port.

In addition, it should be noted that, because the volume of the movable permanent magnet is relatively small and the weight is relatively light, when the coil assembly is electrified, the movable permanent magnet can move up rapidly, so that the movable permanent magnet can release the elastic force of the movable iron core spring, the spring pressure on the movable iron core is reduced, the movable iron core can also move rapidly under the action of the electromagnetic attraction, and the valve port is opened; when the coil assembly is powered off, the movable permanent magnet is subjected to the repulsive force of the fixed permanent magnet to rapidly press the movable iron core spring, the movable iron core spring can also rapidly transmit the elastic force to the movable iron core, and at the moment, the movable iron core rapidly resets under the action of self gravity and elastic force to close the valve port; after long-time work, even if the elastic force of the movable iron core spring is reduced due to stress fatigue, the movable permanent magnet is always subjected to the repulsive force of the fixed permanent magnet, so that the downward moving stroke of the movable permanent magnet is increased, the pressure of the movable permanent magnet on the movable iron core spring is increased, the elastic force of the movable iron core spring is compensated, and the movable iron core can be rapidly reset and tightly blocks the valve port.

To sum up, the utility model has the advantages of simple and reasonable structure, response speed is very fast, and the working property is reliable and stable, and life is longer.

Drawings

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

Fig. 2 is an enlarged schematic view of a portion a in fig. 1.

In FIGS. 1-2: 1. a valve body; 11. a valve cavity; 12. an air inlet; 13. a working port; 14. a valve port; 15. a frustum; 21. a magnetism isolating pipe; 211. a seal ring; 22. a stationary iron core; 23. a movable iron core; 231. an upper plug head; 232. a lower plug head; 24. a movable iron core spring; 25. a coil assembly; 26. a movable permanent magnet; 27. fixing a permanent magnet; 28. a magnetic isolation sleeve; 29. a protective cover; 3. a manual lever; 4. a valve seat.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

The electromagnetic valve shown in fig. 1-2 comprises a valve body 1 and a pilot head assembly arranged on the valve body 1, wherein the valve body 1 is respectively provided with a valve cavity 11, an air inlet 12, a working port 13 and a valve port 14, the air inlet 12 is directly communicated with the valve cavity 11, and the working port 13 is communicated with the valve cavity 11 through the valve port 14.

The pilot head assembly comprises a magnetism isolating pipe 21, a static iron core 22, a movable iron core 23, a movable iron core spring 24, a coil assembly 25, a movable permanent magnet 26 and a fixed permanent magnet 27. The bottom of the magnetism isolating pipe 21 is fixedly connected with the valve body 1 through the valve seat 4, the static iron core 22 is fixedly arranged at the top of the magnetism isolating pipe 21, the movable iron core 23 is movably arranged in the magnetism isolating pipe 21, the static iron core 22 is in a hollow arrangement which is through along the axial direction, the upper end of the movable iron core 23 is in sealing fit with the lower end face of the static iron core 22, the lower end of the movable iron core 23 extends into the valve cavity 11 and is in sealing fit with the valve port 14, and the coil assembly 25 is sleeved outside the magnetism isolating pipe 21; a magnetism isolating sleeve 28 is arranged in the static iron core 22, the movable permanent magnet 26 is movably arranged in the magnetism isolating sleeve 28, and the magnetism isolating sleeve 28 ensures that the movable permanent magnet 26 can freely move in the static iron core 22. Move the iron core spring 24 and support and locate between activity permanent magnet 26 and the movable iron core 23, fixed permanent magnet 27 is fixed in the top of quiet iron core 22, and in this embodiment, the periphery cover of fixed permanent magnet 27 is equipped with protection casing 29, and protection casing 29 and quiet iron core 22 screw thread fixed connection through setting up protection casing 29, can effectively play the guard action to fixed permanent magnet 27.

The movable permanent magnet 26 and the fixed permanent magnet 27 are both arranged in a hollow way and are penetrated along the axial direction; the fixed permanent magnet 27 is disposed opposite to the same pole of the movable permanent magnet 26, for example, the N pole of the fixed permanent magnet 27 is disposed opposite to the N pole of the movable permanent magnet 26. The coil assembly 25 is energized to produce a magnetic pole having the same direction as the movable permanent magnet 26.

The utility model provides an electromagnetic valve, the essence is a normally closed type two-position three-way electromagnetic valve, through setting up the pilot head subassembly that constitutes by the cooperation of parts such as magnetic isolation pipe 21, quiet iron core 22, move iron core 23, move iron core spring 24, coil pack 25, magnetic isolation cover 28, activity permanent magnet 26 and fixed permanent magnet 27, and with fixed permanent magnet 27 and activity permanent magnet 26 homopolar relative, make fixed permanent magnet 27 produce vertical decurrent repulsion force to activity permanent magnet 26 all the time, in operation, when coil pack 25 is in the outage state (normal state), at this moment, activity permanent magnet 26 pushes down iron core spring 24 because of receiving the repulsive force effect of fixed permanent magnet 27, move iron core spring 24 further pushes down iron core 23, make the lower extreme and the valve port 14 sealing contact of moving iron core 23, and the upper end and the quiet iron core 22 separation of moving iron core 23, working port 13 is in the closed condition this moment, the gas in the valve cavity 11 is exhausted to the atmosphere through a hollow passage formed by matching the static iron core 22, the movable permanent magnet 26 and the fixed permanent magnet 27; when the coil assembly 25 is in the energized state, the coil assembly 25 generates electromagnetic attraction, and not only the movable permanent magnet 26 will move upward against the repulsive force of the fixed permanent magnet 27, but also the movable iron core 23 will move upward against the elastic force of the movable iron core spring 24, so that the lower end of the movable iron core 23 is separated from the valve port 14, the upper end of the movable iron core 23 is in sealed contact with the lower end of the stationary iron core 22, and at this time, the gas in the valve chamber 11 is discharged to the working port 13 through the valve port 14.

In addition, it should be noted that, because the volume of the movable permanent magnet 26 is relatively small and the weight is relatively light, when the coil assembly 25 is energized, the movable permanent magnet 26 will move up rapidly, so that the movable permanent magnet 26 will release the elastic force of the movable iron core spring 24, so that the spring pressure applied to the movable iron core 23 is reduced, and the movable iron core 23 will also move rapidly under the action of the electromagnetic attraction, so as to open the valve port 14; when the coil assembly 25 is powered off, the movable permanent magnet 26 is subjected to the repulsive force of the fixed permanent magnet 27 to rapidly press the movable iron core spring 24, the movable iron core spring 24 also rapidly transmits the elastic force to the movable iron core 23, and at the moment, the movable iron core 23 rapidly resets under the action of self gravity and the elastic force to close the valve port 14; after long-time operation, even if the elastic force of the movable iron core spring 24 is reduced due to stress fatigue, the movable permanent magnet 26 is always subjected to the repulsive force of the fixed permanent magnet 27, so that the downward moving stroke of the movable permanent magnet 26 is increased, the pressure of the movable permanent magnet 26 on the movable iron core spring 24 is increased, the elastic force of the movable iron core spring 24 is compensated, and the movable iron core 23 is ensured to be rapidly reset and close the valve port 14.

In this embodiment, the upper end of the movable iron core 23 is provided with an upper plug 231 which is in sealing fit with the lower end face of the stationary iron core 22, the movable iron core spring 24 is abutted between the upper plug 231 and the movable permanent magnet 26, the periphery of the valve port 14 extends towards the valve cavity 11 to form a frustum 15 corresponding to the movable iron core 23, and the lower end of the movable iron core 23 is provided with a lower plug 232 which is in sealing fit with the frustum 15. By arranging the upper plug 231 and the lower plug 232, the sealing effect of the movable iron core 23 on the valve port 14 and the static iron core 22 can be effectively improved, and the air leakage phenomenon is prevented.

In this embodiment, the bottom of the magnetism isolating pipe 21 is inserted into the valve body 1, and a sealing ring 211 is embedded between the outer wall of the bottom of the magnetism isolating pipe 21 and the inner wall of the valve cavity 11. The bottom of the magnetism isolating pipe 21 is inserted into the valve body 1, so that the magnetism isolating pipe 21 is more stably installed and is not easy to shake, and meanwhile, the sealing ring 211 is additionally arranged, so that gas in the valve cavity 11 is effectively prevented from leaking.

In this embodiment, the side wall of the valve body 1 is further provided with a manual lever 3 correspondingly matched with the lower end of the movable iron core 23. When needs are right the utility model provides a solenoid valve is maintained, is overhauld, when debugging, through pulling manual pole 3, can manual drive move iron core 23 rebound to avoid coil pack 25 to appear burning out because of long-time circular telegram.

The above is only the preferred embodiment of the present invention, so all the equivalent changes or modifications made by the structure, features and principles in accordance with the claims of the present invention are included in the claims of the present invention.

Claims

1. An electromagnetic valve comprises a valve body and a pilot head assembly arranged on the valve body, wherein the valve body is respectively provided with a valve cavity, an air inlet, a working port and a valve port, the air inlet is directly communicated with the valve cavity, and the working port is communicated with the valve cavity through the valve port, and the electromagnetic valve is characterized in that: the pilot head assembly comprises a magnetism isolating pipe, a static iron core, a movable iron core spring, a coil assembly, a movable permanent magnet and a fixed permanent magnet;

2. The solenoid valve according to claim 1, wherein: the periphery of the fixed permanent magnet is covered with a protective cover, and the protective cover is fixedly connected with the static iron core through threads.

3. The solenoid valve according to claim 1, wherein: the upper end of the movable iron core is provided with an upper plug head which is in sealing fit with the lower end face of the static iron core, and the movable iron core spring is abutted between the upper plug head and the movable permanent magnet.

4. The solenoid valve according to claim 1, wherein: the periphery of the valve port extends towards the valve cavity direction to form a frustum corresponding to the movable iron core, and the lower end of the movable iron core is provided with a lower plug head in sealing fit with the frustum.

5. The solenoid valve according to claim 1, wherein: the bottom of the magnetism isolating pipe is inserted into the valve body, and a sealing ring is embedded between the outer wall of the bottom of the magnetism isolating pipe and the inner wall of the valve cavity.

6. The solenoid valve according to claim 1, wherein: and the side wall of the valve body is also provided with a manual rod correspondingly matched with the lower end of the movable iron core.