CN216078529U - Electromagnetic valve - Google Patents

Abstract

The utility model discloses a solenoid valve, which comprises a piston part, wherein the piston part is arranged in a valve cavity of the solenoid valve, the piston part comprises a piston body, a first sealing element and a second sealing element, the first sealing element and the second sealing element are arranged along the axial direction of the piston body, the first sealing element comprises a base part and an extension part, the base part is fixedly connected or in limited connection with the piston body, the extension part extends along the axial direction of the piston body, the second sealing element is fixedly connected or in limited connection with the piston body, and the second sealing element can be elastically abutted against the inner wall part of the valve body.

Description

Electromagnetic valve

Technical Field

The utility model relates to the technical field of fluid control, in particular to an electromagnetic valve.

Background

Solenoid valves with piston members are widely used, and in pilot-operated solenoid valves, the piston members slide in a valve chamber and abut against or separate from a valve port portion to control opening and closing of the solenoid valve, so that flow path control can be achieved by a small valve opening electromagnetic force.

How to improve the structural design of the piston component of the solenoid valve to improve the reliability of the sliding of the piston component in the valve cavity is a problem that those skilled in the art are concerned about.

SUMMERY OF THE UTILITY MODEL

The utility model provides an electromagnetic valve, which comprises a valve body component, a piston component and a valve body, wherein the valve body component comprises a valve body, the valve body comprises an inner wall part, the piston component is arranged in a valve cavity of the electromagnetic valve, and the piston component can slide relative to the inner wall part; the piston component comprises a piston body, a first sealing element and a second sealing element, the first sealing element and the second sealing element are arranged along the axial direction of the piston body, the first sealing element comprises a base part and an extension part, the base part is fixedly connected or in limited connection with the piston body, the extension part extends along the axial direction of the piston body, the extension part is annular, the extension part can be elastically abutted against the inner wall part, the second sealing element is fixedly connected or in limited connection with the piston body, and the second sealing element can be elastically abutted against the inner wall part.

The electromagnetic valve provided by the utility model can improve the reliability of the sliding of the piston component in the valve cavity.

Drawings

FIG. 1: the utility model provides a structural schematic diagram of an electromagnetic valve;

FIG. 2: FIG. 1 is a schematic view of a piston assembly;

FIG. 3: FIG. 1 is a schematic view of a pilot valve member;

FIG. 4: FIG. 2 is a schematic view of a first seal;

FIG. 5: fig. 2 is a schematic view of a second seal. Symbolic illustration in fig. 1-4:

10-solenoid valve/pilot operated solenoid valve;

100-a valve body component;

110-an upper valve body;

111-an inner wall portion;

112-a piston bore;

120-a lower valve body;

121-valve port;

122-first flow path port;

123-second flow path port;

130-a valve cover;

140-a valve cavity;

200-a piston member;

210-a piston body;

220-a first seal;

221-a base;

222-an extension;

223-a transition;

230-a second seal;

260-a body member;

261-outer edge portion;

262-a seal groove;

263-annular groove;

270-closing the valve element;

271-closing valve part;

280-a fastener;

290-a resilient support;

300-pilot valve part;

310-a valve housing;

320-a stationary core;

330-movable iron core;

340-a pilot valve core;

350-a guide valve seat;

351-pilot valve mouth;

400-valve chamber spring.

Detailed Description

In order to make the technical solutions of the present invention better understood, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments. It is obvious that the drawings in the following description are only some embodiments of the utility model, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. The upper and lower terms used herein are defined by the positions of the components shown in the drawings, and are only used for the sake of clarity and convenience in technical solution, and it should be understood that the terms used herein should not limit the scope of the claims; it will also be appreciated that the structural relationships illustrated herein, whether connected, secured, abutted, or otherwise, are intended to encompass both direct and indirect methods, unless specifically noted to embody the novel concepts of its utility.

Fig. 1 is a schematic structural diagram of a solenoid valve according to the present invention.

As shown in fig. 1. In this embodiment, the solenoid valve 10 is embodied as a pilot type solenoid valve, and includes a valve body part 100, a piston part 200, and a pilot valve part 300.

The valve body assembly 100 comprises a valve body, which in this particular embodiment is comprised of an upper valve body 110 and a lower valve body 120 fixedly mounted. The lower valve body 120 includes a first flow path port 122 (as an inlet port), and a second flow path port 123 (as an outlet port). The lower valve body 120 is also provided with a valve port portion 121. The upper valve body 110 and the lower valve body 120 enclose a valve chamber 140 of the solenoid valve.

The piston member 200 is disposed in the valve chamber 140. The upper valve body 110 is provided with an annular inner wall portion 111, the inner wall portion 111 encloses a piston hole 112, and the piston member 200 is slidable in the piston hole 112 in the axial direction with respect to the inner wall portion 111. The solenoid valve 10 further includes a valve chamber spring 400, and the valve chamber spring 400 is in contact with a space between the piston member 200 and the upper valve body 110, and allows the lower end of the piston member 200 to contact the valve port portion 121.

The valve body part 100 further comprises a valve cover 130, the valve cover 130 is fixedly welded with the pilot valve part 300, and the valve cover 130 is detachably connected with the upper valve body 110 through threads.

Fig. 2 is a schematic view showing the structure of the piston assembly of fig. 1, and fig. 4 and 5 are schematic views showing a first seal and a second seal, respectively.

As shown in fig. 2 and 4 and with reference to fig. 1. The piston part 200 includes a piston body 210, a first sealing member 220, and a second sealing member 230. Piston body 210 includes body member 260, valve closure member 270 and fastener 280. The valve member 270 is fixedly attached to the body member 260 by a fastener 280, and the lower end of the valve member 270 includes a flexible gasket as a valve closing portion 271. The shut-off portion 271 can abut against the valve port portion 121 to seal the valve port.

In this embodiment, first seal 220 includes a base 221, an extension 222, and a transition 223. The base 221 is annular, the base 221 is sleeved on the step shaft of the lower section of the body member 260 and is fixedly connected with the piston body 210, one side of the base 221 abuts against the valve closing member 271, and the other side of the base 221 abuts against the body member 260. Of course, the base 221 can also be in positive connection with the piston body 210.

As a further technical solution, the piston member 200 further includes an elastic support 290. The elastic supporting member 290 is stacked with the first sealing member 220, one side of the base portion 221 abuts against the valve closing member 270, and the other side of the base portion 221 abuts against the body member 260, so as to enhance the rigidity of the first sealing member 220.

The extension 222 is located at the outer edge 261 of the piston body 210. The extension 222 is annular, and the extension 222 extends in the axial direction of the piston body 210 away from the second seal 230. In this embodiment, the extension 222 extends axially while having a radially extending component, so the outer edge of the extension 222 increases in diameter in the direction of extension (i.e., forms a diverging structure in the axial and radial directions, extending partially in the axial direction and partially in the radial direction). The base 221 and the extension 222 further include an annular transition portion 223 therebetween, which can improve the elastic deformability of the extension 222. After the piston member 200 is placed in the valve chamber 140, the extension 222 abuts against the inner wall portion 111 of the upper valve body 110 by elastic deformation. The extension 222 can be fitted to the inner wall 111 in the axial direction of the piston body 210.

As shown in fig. 5, the second sealing member 230 is an elastic sealing ring, the cross section of the second sealing member 230 is substantially rectangular, trapezoidal, circular, etc. regular shapes, and the second sealing member 230 is disposed at the radial outer edge of the piston body 210. The installation is convenient. In this particular embodiment, the second seal 230 is embodied as a rectangular seal ring having an opening. The outer edge portion 261 of the body member 260 has a sealing groove 262, and the sealing ring is partially disposed in the sealing groove 262, so that the second sealing member 230 can be movably connected with the body member 260 in a limited manner, or can be directly fixedly connected with the body member. After the piston member 200 is seated in the valve chamber 140, the second sealing member 230 abuts against the inner wall portion 111 of the upper valve body 110 by being elastically deformed.

Figure 3 is a schematic view of the pilot valve member of figure 1.

As shown in fig. 3 and with reference to fig. 1. The pilot valve member 300 includes a valve housing 310, a plunger 320 disposed in the valve housing 310, and a plunger 330. The valve housing 310 is welded to the valve cover 130. The pilot valve member 300 also includes a pilot valve spool 340 and a pilot valve seat 350. The pilot valve seat 350 is provided with a pilot valve opening 351. The plunger 330 can slide the pilot valve spool 340, and the pilot valve spool 340 can abut against or move away from the pilot valve mouth 351.

The above technical solution is advantageous in that the first sealing member 220 and the second sealing member 230 are arranged along the axial direction of the piston body 210 by arranging the first sealing member 220 and the second sealing member 230, and the first sealing member 220 and the second sealing member 230 have a certain axial distance therebetween.

When the piston member 200 axially slides relative to the inner wall 111 of the valve body member 100, the extension 222 of the first sealing member 220 easily axially pushes the contacted solid impurities, so as to prevent the solid impurities from entering the gap between the piston body 210 and the inner wall 111 and reduce the friction damage of the piston body 210 or the valve body and the impurities; the second sealing member 230 assists the first sealing member 220 in engaging with the piston member 200, and serves as a support structure for the piston member 200 to prevent the piston member from being axially inclined and contacting the inner wall portion 111. This design improves the reliability of the sliding process of the piston member 200 within the valve cavity.

Further, the improvement of the above technical solution can reduce the design gap between the piston body 210 and the inner wall 111, and is more suitable for the use of the solenoid valve in an oil-free system.

To further improve the supporting structure of the piston assembly 200 in the above-described technical solution,

to further improve the resistance of the above technical solution to solid impurities, the first sealing member 220 is closer to the valve closing portion 271 than the second sealing member 230, and the extending portion 222 extends in the axial direction of the piston body 210 toward the valve closing portion 271. In this embodiment, the extension 222 can reduce the solid impurities entering from the fluid inlet end 122 below the piston body 210, and enter between the piston body 210 and the inner wall 111 and above the piston body 210 for better isolation.

To further improve the resistance of the above technical solution against solid impurities, the outer edge portion 261 of the piston body 210 includes two or more annular grooves 263 (two in the figure), and the annular grooves 263 are located between the first sealing member 220 and the second sealing member 230. In this case, the annular groove 263 can receive a small amount of solid impurities that may enter between the piston body 210 and the inner wall part 111, reducing damage to the piston body 210 and the valve body.

In order to further improve the above technical solution, the extension portion 222 has an outer edge diameter gradually increased in the extension direction in order to provide an axial pushing force against the solid impurities and a sealing performance between the extension portion 222 and the inner wall portion 111.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements should also be considered as the protection scope of the present invention.

Claims (7)

1. A solenoid valve comprises a valve body component, wherein the valve body component comprises a valve body which comprises an inner wall part, and is characterized by further comprising a piston component, the piston component is arranged in a valve cavity of the solenoid valve, and the piston component can slide relative to the inner wall part;

the piston component comprises a piston body, a first sealing element and a second sealing element, the first sealing element and the second sealing element are arranged along the axial direction of the piston body, the first sealing element comprises a base part and an extension part, the base part is fixedly connected or in limited connection with the piston body, the extension part extends along the axial direction of the piston body, the extension part is annular, the extension part can be elastically abutted against the inner wall part, the second sealing element is fixedly connected or in limited connection with the piston body, and the second sealing element can be elastically abutted against the inner wall part.

2. The electromagnetic valve according to claim 1, wherein the extending portion extends in a direction away from the second seal member, the valve body includes a valve port portion, the piston member includes a shut-off portion capable of abutting against the valve port portion, and the extending portion extends in the direction of the shut-off portion in the axial direction of the piston body.

3. The solenoid valve of claim 2 wherein said outer rim portion of said piston body includes an annular groove, said annular groove being located between said first seal member and said second seal member.

4. The electromagnetic valve according to claim 3, wherein the annular grooves are two or more and are provided in the axial direction of the piston body.

5. The solenoid valve of claim 2 wherein the outer edge of said extension portion is tapered in diameter in the direction of extension.

6. The solenoid valve according to claim 2, characterized in that it comprises an annular transition between said base and said extension, said second sealing element being placed at a radially outer edge of said piston body, said second sealing element being in particular an elastic sealing ring with a rectangular, trapezoidal or circular cross section.

7. The solenoid valve of any one of claims 2 to 6, wherein said solenoid valve is a pilot operated solenoid valve, said solenoid valve comprises a pilot valve member comprising a pilot valve spool and a pilot valve port, said piston body comprises a body member and a shut-off valve member, said shut-off valve member comprises said shut-off valve portion, said shut-off valve member is secured to said body member by a fastener, said piston member further comprises a resilient support tab, said resilient support tab is disposed in a stacked arrangement with said first sealing member, one side of said base portion abuts said shut-off valve member, and the other side of said base portion abuts said body member.

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