CN213017866U - Miniature electromagnetic valve - Google Patents

Abstract

The utility model provides a miniature solenoid valve, including the valve body that has central passage, be provided with first passageway and second passageway on the valve body, and install the solenoid assembly of one end department of valve body. The miniature electromagnetic valve also comprises a valve core which is arranged in the central channel in a clearance mode so as to be capable of moving along the axial direction, and the valve core is provided with a first sealing element and a second sealing element which are spaced along the axial direction. One end of the spool has a plunger that extends into the solenoid coil assembly. When the micro electromagnetic valve is not electrified, the first channel and the second channel are positioned between the two sealing pieces in the axial direction, so that the valve core of the first channel and the second channel is communicated with the gap between the central channel. When the miniature solenoid valve is energized, the solenoid assembly moves the spool by attracting the core, whereby only one of the two passages is axially between the two seals, cutting off communication between the two passages.

Description

Miniature electromagnetic valve

Technical Field

The utility model relates to a miniature solenoid valve.

Background

The electromagnetic valve is an industrial device which controls the movement of a magnet by utilizing electromagnetic force, so that the on-off of a liquid flow channel is controlled by the movement of the magnet. Solenoid valves are the basic elements of automation for controlling fluids and are used in industrial control systems to regulate the direction, flow, velocity and other parameters of media. Compared with other valve bodies, the electromagnetic valve has the characteristics of high control precision, flexible use and the like, and is widely applied to industrial production processes.

At present, in some fields of aviation, aerospace, petroleum, petrochemical industry and the like, electromagnetic valves are often needed to control some high-pressure small-flow fluids. In particular, in the field of oil and gas exploration, solenoid valves are often used in formations with depths of several kilometers, and the pressure of the bottom layer in such an environment is very high, resulting in very large fluid pressures. However, it is difficult for the current solenoid valve to provide enough magnetic force to control the magnet to ensure that the magnet moves normally against the pressure of the fluid. Therefore, the conventional solenoid valve is hardly suitable for a high-pressure environment.

In addition, in the fields of aviation, aerospace and the like, the smaller the volume of the electromagnetic valve, the better. Therefore, there is a need in these fields for a solenoid valve that is compact and small. However, it is difficult for the current solenoid valves to satisfy both of these requirements.

SUMMERY OF THE UTILITY MODEL

To the technical problem as above, the utility model aims at providing a miniature solenoid valve can make the case no longer receive the pressure of liquid in the axial through this miniature solenoid valve to do not need very high electromagnetic force alright control case to remove in the solenoid valve, reach the effect of control liquid circulation passageway break-make. Moreover, the utility model discloses simple structure is compact, can satisfy fields such as aviation, space flight and oil to the requirement of the little volume of solenoid valve.

According to the utility model discloses a miniature solenoid valve, miniature solenoid valve is including the valve body that has central passage be provided with the first passageway and the second passageway that supply the liquid circulation on the valve body, and install the solenoid assembly of one end department of valve body. And the utility model discloses a miniature solenoid valve is still including clearance formula setting in so that can follow axial motion's case in the central passage, be equipped with two first sealing members and the second sealing member along axial spaced apart on the case, the one end of case has and extends to iron core in the solenoid subassembly. Wherein the micro solenoid valve is configured such that when not energized, the first and second passages are both axially between the first and second seals such that the first and second passages communicate through a gap between the spool and the central passage. When the micro solenoid valve is configured to be energized, the solenoid assembly moves the spool by attracting the plunger portion, whereby only one of the first and second passages is axially between the first and second seals, thereby shutting off communication between the first and second passages.

In a preferred embodiment, the solenoid assembly comprises an annular solenoid disposed at one end of the valve body, and a magnetic conductor disposed outside the coil.

In a preferred embodiment, a magnetic conduction pipe communicated with the central channel of the valve body is further arranged inside the electromagnetic coil assembly.

In a preferred embodiment, a magnetic conduction liquid channel communicated with the magnetic conduction pipe is arranged on the valve body.

In a preferred embodiment, a cylindrical end cap is further disposed on the iron core, and the end cap can abut against the magnetic conductor to limit the stroke of the iron core.

In a preferred embodiment, a spring is sleeved on the end cap between a step formed between the end cap and the iron core and the magnetic conductor.

In a preferred embodiment, the first and second seals are O-rings.

In a preferred embodiment, two grooves are formed on the outer circumference of the valve spool for mounting the first and second seals, respectively.

In a preferred embodiment, a sealing liquid port is provided near the other end of the valve body, and the sealing liquid port is always located below the lower one of the first sealing element and the second sealing element.

In a preferred embodiment, a sealing thread is provided at the other end of the valve body.

Drawings

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

Fig. 1 shows a schematic view of a miniature solenoid valve according to the present invention when it is in power off.

FIG. 2 shows a schematic view of the miniature solenoid valve of FIG. 1 when energized.

In the present application, all the figures are schematic and are only intended to illustrate the principles of the present invention and are not drawn to scale.

Detailed Description

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

Fig. 1 shows a schematic diagram of a micro solenoid valve 100 according to an embodiment of the present invention when it is powered off. As shown in fig. 1, the micro solenoid valve 100 includes a valve body 10, a central passage 15 is provided inside the valve body 10, and a first passage 16 and a second passage 17 communicating with the central passage 15 are provided in the valve body 10.

As shown in fig. 1, the first passage 16 and the second passage 17 each communicate with the central passage 15 in a radial direction, and are preferably opposite to each other with respect to an axial centerline of the central passage 15.

As shown in fig. 1, a solenoid coil assembly 20 is provided at one end (upper end in the drawing) of the valve body 10. The electromagnetic coil assembly 20 includes an energizable toroidal coil 22 disposed above the valve body 10, and a toroidal magnetizer 25 disposed outside the toroidal coil 22 and surrounding the toroidal coil 22. A magnetic conduction pipe 26 is also arranged in the annular coil 22, and magnetic conduction liquid is arranged in the magnetic conduction pipe 26. The magnetic flux may enhance the attraction to the core (described below) when the toroidal coil 22 is energized. The valve body 10 is also provided with a magnetic conduction liquid port 28 communicated with the magnetic conduction pipe 26. The magnetic conduction liquid port 28 is communicated with a magnetic conduction liquid tank (not shown) for sucking or discharging the magnetic conduction liquid in the magnetic conduction pipe 26.

According to the present invention, as shown in fig. 1, a cylindrical valve element 30 that can move in the axial direction is provided in the central passage 15 of the valve body 10. The diameter of the spool 30 is set smaller than the diameter of the central passage 15 so that a gap 18 is formed between the spool 30 and the inner cavity 15. A first groove 32 and a second groove 34 are provided on the outer periphery of the valve body 30 from top to bottom, and a first seal ring 31 and a second seal ring 33 are mounted in the first groove 32 and the second groove 34, respectively. The gap 18 can be sealed by providing a first seal 31 and a second seal 33. According to the present invention, in the non-energized state of the solenoid valve 100 shown in fig. 1, the first passage 16 and the second passage 17 are both located between the first seal ring 31 and the second seal ring 33 in the axial direction of the spool 30.

Further, a core 40 is provided at an upper end of the valve body 30 (i.e., an end facing the solenoid coil assembly 20). A cylindrical end cap 45 is provided at the upper end of the core 40. The end caps 45 have a diameter smaller than that of the plunger 40, thereby forming a step therebetween. A spring 42 is sleeved on the outer periphery of the end cap 45, and the spring 42 is positioned between the step and the magnetizer 25. Thus, the valve core 30 can be moved in the axial direction by the elastic force of the spring 42.

Further, as shown in fig. 1, a sealing liquid port 50 is further provided in the central passage 15 below the second seal ring 33, and the sealing liquid port 50 communicates with a sealing liquid tank (not shown) for sucking or discharging the sealing liquid. This ensures that the pressure in the space below the second seal 43 in the central passage 15 is always constant during the movement of the spool 30.

As shown in fig. 1, a sealing thread 60 may be further provided at a lower end of the valve body 10 of the solenoid valve 100 for fixing and sealing the solenoid valve 100.

The operation of the micro solenoid valve 100 according to the present invention is briefly described as follows.

As shown in FIG. 1, when the toroidal coil 22 is not energized, the micro solenoid valve 100 is in a de-energized state. At this time, the magnetic conductor 25 does not generate magnetic force. The spring 42 is in an extended state under the gravity action of the iron core 42 and the valve core 30, the end cap 45 at the upper end of the iron core 40 is not in contact with the magnetizer 25, and the magnetic conduction pipe 26 does not contain magnetic conduction liquid. In this case, the first passage 16 and the second passage 17 are both located between the first seal ring 31 and the second seal ring 33 in the axial direction of the spool 30. Thereby, high pressure liquid can flow along the first channel 16 through the gap 18 to the second channel 17. At this time, the entire solenoid valve 100 is in an open state.

As shown in fig. 2, when the toroidal coil 22 is energized, the micro solenoid valve 100 is in an energized state. At this time, the magnetizer 25 generates a magnetic force and attracts the iron core 40 to move upward. Meanwhile, the magnetic conduction liquid port 28 sucks the magnetic conduction liquid into the magnetic conduction pipe 26, and the magnetic force applied to the iron core 40 is increased. Thus, the iron core 40 and the valve core 30 will move upwards under the action of magnetic force, so that the spring 42 is in a compressed state until the end cap 45 at the upper end of the iron core 40 abuts against the valve body magnetizer 25. In this case, due to the upward movement of the spool 30, the first passage 16 is located between the first seal ring 31 and the second seal ring 33 in the axial direction of the spool 30, and the second passage 17 is located below the second seal ring 33 in the axial direction of the spool 30. That is, only the first passage 16 of the first passage 16 and the second passage 17 is between the first seal ring 31 and the second seal ring 33, and the second passage 17 is not between the first seal ring 31 and the second seal ring 33. At this time, the high-pressure liquid enters the gap 18 along the first passage 16. However, due to the sealing action of the first seal ring 31 and the second seal ring 33, the high-pressure liquid cannot flow to the second passage 17 that is not between the first seal ring 31 and the second seal ring 33. At this time, the entire solenoid valve 100 is in a closed state.

As the valve element 30 moves, the sealing liquid port 50 sucks the sealing liquid to fill the space below the second sealing ring 33, which increases as the valve element 30 moves upward, thereby ensuring that the pressure in the space below the second sealing ring 33 in the central passage 15 is always constant.

According to the miniature solenoid valve 100 of the present invention, when the solenoid valve 100 is in the open state, the high-pressure liquid flows between the first sealing ring 31 and the second sealing ring 33 in the central passage 15 all the time, so that the valve element 30 and the iron core 40 are axially protected from the axial force generated by the liquid due to the pressure. Therefore, the micro-solenoid valve 100 does not require a high electromagnetic force to attract the iron core 40 to move. Therefore, the utility model discloses a miniature solenoid valve 100 more is applicable to highly compressed operational environment. And simultaneously, the utility model discloses a miniature solenoid valve 100's simple structure is compact, and the volume is less, more is applicable to fields such as aviation, space flight and oil.

Finally, it should be noted that the above description is only a preferred embodiment of the present invention, and should not be construed as limiting the present invention in any way. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing examples, or that equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A miniature solenoid valve, comprising:

a valve body with a central channel, a first channel and a second channel for liquid to flow through are arranged on the valve body,

a solenoid coil assembly mounted at one end of the valve body,

a spool disposed in the central passage in a clearance-type manner for axial movement, the spool having two axially spaced first and second seals, one end of the spool having a plunger extending into the solenoid assembly,

wherein the micro solenoid valve is configured such that, when not energized, the first and second passages are both axially between the first and second seals such that the first and second passages communicate through a gap between the spool and the central passage, and,

the micro solenoid valve is configured such that when energized, the solenoid assembly moves the spool by attracting the plunger, whereby only one of the first and second passages is axially between the first and second seals, thereby shutting off communication between the first and second passages.

2. The miniature solenoid valve of claim 1 wherein said solenoid assembly comprises an annular solenoid disposed at one end of said valve body and a magnetically conductive member disposed outside said coil.

3. The micro solenoid valve as claimed in claim 2, wherein a magnetic conductive tube communicating with the central passage of the valve body is further provided inside the solenoid assembly.

4. The micro electromagnetic valve according to claim 3, wherein a magnetic conductive liquid passage communicated with the magnetic conductive pipe is provided on the valve body.

5. The micro electromagnetic valve according to any one of claims 2 to 4, wherein a cylindrical end cap is further provided on the iron core, and the end cap can abut against the magnetic conductor to limit the stroke of the iron core.

6. The micro solenoid valve as claimed in claim 5, wherein a spring is sleeved at the end cap between a step formed between the end cap and the iron core and the magnetic conductor.

7. The micro electromagnetic valve according to any one of claims 1 to 4, wherein two grooves are formed on an outer circumference of the spool for mounting the first seal and the second seal, respectively.

8. The micro solenoid valve of claim 7, wherein the first and second seals are O-rings.

9. The micro electromagnetic valve according to any one of claims 1 to 4, wherein a sealing liquid port is provided near the other end of the valve body, the sealing liquid port being always below the lower one of the first seal and the second seal.

10. The micro electromagnetic valve according to any one of claims 1 to 4, wherein a sealing thread is provided at the other end of the valve body.

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