CN212839680U

CN212839680U - Self-compensating normally open electromagnetic valve

Info

Publication number: CN212839680U
Application number: CN202021602284.9U
Authority: CN
Inventors: 罗福军
Original assignee: Owen Kelly Auto Control Valves Shanghai Co ltd
Current assignee: Owen Kelly Auto Control Valves Shanghai Co ltd
Priority date: 2020-08-05
Filing date: 2020-08-05
Publication date: 2021-03-30
Anticipated expiration: 2030-08-05

Abstract

The invention relates to the technical field of electromagnetic valves, in particular to a self-compensation normally open electromagnetic valve. The self-compensating valve comprises a valve body, a valve cover fixedly arranged on the valve body and an electromagnetic assembly which is arranged on the valve cover and fixedly connected with the valve cover through a valve seat, wherein the self-compensating device comprises a small valve rod, a pre-tightening spring arranged in a cavity at the lower part of the small valve rod and a flow guide port sealing gasket fixed below the pre-tightening spring, the upper surface of the pre-tightening spring is fixedly connected with the top of the cavity, and the self-compensating device is fixedly connected with the bottom of an air chamber through a normally open spring; the piston assembly comprises a plug head and an ejector rod fixedly arranged in the middle of the plug head, the ejector rod is in a multilayer ladder shape, and the plug head is fixedly connected with the top of a cavity on the valve through a main spring. The utility model discloses carry out effectual compensation when can closing to the sound iron core, and through the leakproofness to the improvement of main valve mouth sealing member structure in order to improve the solenoid valve.

Description

Self-compensating normally open electromagnetic valve

Technical Field

The invention relates to the technical field of electromagnetic valves, in particular to a self-compensation normally open electromagnetic valve.

Background

With the continuous development of modern society, the popularization of automation equipment is more and more extensive, and the usage of the electromagnetic valve as an automatic fluid control element is also more and more. The electromagnetic valves are various in types, but the basic principle is different. The two-way solenoid valve generally has a normally closed type and a normally open type, and is called a normally closed type solenoid valve, in which the solenoid valve is in a closed state when the coil is de-energized and in an open state after the coil is energized. When the coil is powered off, the coil is in an open state, and after the coil is powered on, the coil is in a closed state, which is called a normally open type electromagnetic valve. Normally closed type solenoid valve is generally applicable to the system of closing for a long time, but in the real production, some systems need open for a long time, consequently need select normally open solenoid valve for use, but traditional in normally open solenoid valve, the installation that sealed pad on the little valve rod still adopts is that the pin rivets this kind of fixed mounting mode, no compensation function when sound iron core is closed, just need carry out the sealed leakproofness of the sealed pad of continuous maintenance little valve rod size one assurance under this condition, the proportion of once installing and debugging success is less than 5%, if the debugging is unsuccessful, can appear the phenomenon that the main valve mouth can't seal or abnormal sound when using, it is time consuming and labor consuming, and product quality is very unstable, in addition, the main valve mouth is because the structure of its sealing member is improper, also can produce the overflow or can't stop the phenomenon of medium.

SUMMERY OF THE UTILITY MODEL

To the problem that exists among the prior art, the utility model aims at providing a can carry out the self compensating formula normally open solenoid valve of effective compensation when closing the sound iron core, and through the leakproofness to the improvement of main valve mouth sealing member structure in order to improve the solenoid valve.

The utility model provides a technical scheme does: a self-compensating normally open solenoid valve comprises a valve body, a valve cover fixedly arranged on the valve body and an electromagnetic assembly which is arranged on the valve cover and fixedly connected with the valve cover through a valve seat, wherein a fluid inlet and a fluid outlet are respectively arranged on the side wall of the valve body; a flow guide opening is formed in the valve cover, a flow guide channel communicated with the flow guide opening is formed in the valve cover and the valve body, and the flow guide channel is communicated with the fluid outlet; the electromagnetic assembly comprises a sleeve, a movable iron core, a static iron core and a coil assembly, the movable iron core is movably arranged in the sleeve, the top of the sleeve is fixedly connected with a cap matched with the stop of the movable iron core, the top of the static iron core is fixedly connected with the sleeve, the bottom of the static iron core is fixedly connected with the valve cover, the coil assembly is arranged on the outer wall of the sleeve, an air chamber is formed between the static iron core and the valve cover, a self-compensating device used for controlling the opening or closing of the flow guide opening is arranged in the air chamber, and the air chamber is communicated with the cavity above the valve through a pilot hole arranged in the valve cover, and the electromagnetic assembly is characterized in that: the self-compensating device comprises a small valve rod, a pre-tightening spring arranged in a cavity at the lower part of the small valve rod and a diversion port sealing gasket fixed below the pre-tightening spring, wherein the upper surface of the pre-tightening spring is fixedly connected with the top of the cavity, and the self-compensating device is fixedly connected with the bottom of the air chamber through a normally open spring; the piston assembly comprises a plug head and an ejector rod fixedly arranged in the middle of the plug head, the ejector rod is in a multilayer ladder shape, and the plug head is fixedly connected with the top of a cavity on the valve through a main spring.

The scheme is further improved as follows: a convex structure is arranged in the valve body on one side of the fluid outlet, a guide groove is formed in the convex structure, the guide groove is located in the positive direction of the valve port and is matched with the ejector rod to be used for closing or opening the valve port, and a sealing gasket is further arranged on the ejector rod.

The scheme is further improved as follows: and a sealing ring is also arranged between the valve cover and the valve body.

The scheme is further improved as follows: and a sealing ring in sealing fit with the valve cover is embedded in the upper outer wall of the plug head, and the sealing ring is in sliding fit with the inner wall of the upper cavity of the valve.

Compared with the prior art, the utility model discloses the beneficial effect who brings does:

1. the mounting means who fills up on the little valve rod is riveted by original pin and is changed into portable movable structure, install the pretension spring additional, make sealed pad compensable move, closed loop size when quiet iron core adsorbs, when moving promptly, when quiet iron core adsorbs, if little valve rod size is short on the left side, the size of its shortage can be compensatied to the elasticity of pretension spring, thereby make sealed pad tightly seal the water conservancy diversion mouth, when the size of little valve rod is long on the left side, the spring receives the extrusion and shortens, thereby avoid the moving that the part of little valve rod overlength leads to, quiet iron core adsorbs not inseparable and the abnormal sound that causes, sealed pad has the pretightning force all the time, the reliability of sealing has been guaranteed.

2. The ejector rod is matched with the guide groove in the protruding structure in the valve body, so that the sealing performance of the main valve port is further improved, and the sealing performance of the valve body is improved.

Drawings

Fig. 1 is a sectional view of the present invention in a normally open state.

Fig. 2 is a cross-sectional view of the self-compensating device of the present invention.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

As shown in fig. 1 to 2, a self-compensating normally open solenoid valve includes a valve body 1, a valve cover 2 fixedly disposed on the valve body, and an electromagnetic assembly 4 disposed on the valve cover and fixedly connected to the valve cover 2 through a valve seat 3, wherein a seal ring 20 is further disposed between the valve cover 2 and the valve body 1, a fluid inlet 5 and a fluid outlet 6 are respectively disposed on a side wall of the valve body 1, a main valve port 7 for communicating the fluid inlet 5 with the fluid outlet 6 is disposed in the valve body 1, a piston assembly 8 for controlling the opening or closing of the main valve port 7 is disposed above the main valve port 7, the piston assembly 8 is disposed in the valve body 1, a valve upper cavity 9 is formed between the piston assembly 8 and the valve cover 2, and the valve upper cavity 9 is communicated with the fluid inlet 5 through a micro-guide hole 81 on the piston assembly 8; a diversion port 21 is arranged on the valve cover 2, a diversion channel 10 communicated with the diversion port 21 is arranged inside the valve cover 2 and the valve body 1, and the diversion channel 10 is communicated with the fluid outlet 6; the electromagnetic assembly 4 comprises a sleeve 41, a movable iron core 42, a static iron core 43 and a coil assembly 44, the movable iron core 42 is movably arranged in the sleeve 41, the top of the sleeve 41 is fixedly connected with a cap 11 matched with the movable iron core 42 in a stop way, the top end of the static iron core 43 is fixedly connected with the sleeve 41, the bottom end of the static iron core 43 is fixedly connected with the valve cover 2, the coil assembly 44 is arranged on the outer wall of the sleeve 41, an air chamber 12 is formed between the static iron core 43 and the valve cover 2, a self-compensating device 13 for controlling the opening or closing of the diversion port 21 is arranged in the air chamber 12, the air chamber 12 is communicated with the upper valve cavity 9 through a pilot hole 22 arranged in the valve cover 2, the self-compensating device 13 comprises a small valve rod 131, a pre-tightening spring 132 arranged in the lower cavity of the small valve rod 131 and a diversion port 21 sealing gasket 133 fixed below the pre-tightening spring 132, the upper surface of the pre-tightening spring 132 is fixedly connected with the top of the cavity, and the self-compensating device 13 is fixedly connected with the bottom of the air chamber 12 through a normally-open spring 14; piston assembly 8 includes chock plug 82 and the fixed ejector pin 83 that sets up in the middle of chock plug 82, ejector pin 83 is multilayer echelonment, is located to be equipped with protruding structure 16 in the valve body 1 of fluid outlet 5 one side, guide way 17 has been seted up in protruding structure 16, guide way 17 is located the forward direction of main valve mouth 7, with ejector pin 83 cooperatees and is used for closing or opens main valve mouth 7, still be equipped with sealed pad 84 on the ejector pin 83, little guide hole 81 specifically sets up on the piston head 82, chock plug 82 passes through main spring 15 and valve upper cavity 9 top fixed connection, chock plug 82 outer wall inlay still be equipped with valve gap 2 seal complex sealing ring 85, be equipped with in the sealing ring and support steel ball 86, sealing ring 85 and the inner wall sliding fit of valve upper cavity 9.

The utility model discloses a theory of operation does: when the coil assembly is not electrified, the small valve rod moves upwards under the action of the normally open spring to separate the sealing gasket from the flow guide port, at the moment, the fluid inlet, the micro guide hole, the upper valve cavity, the pilot hole, the air cavity, the flow guide port, the flow guide channel and the fluid outlet are sequentially communicated, so that the fluid inlet and the fluid outlet are in a pressure difference balance state, the piston assembly moves upwards under the action of air pressure of the fluid inlet and opens the main valve port, the fluid inlet is communicated with the fluid outlet, and at the moment, the whole valve is in a normally open state and keeps smooth; when the coil component is electrified, the movable iron core moves downwards under the action of the magnetic attraction of the static iron core, overcomes the elastic force of the normally open spring to push the small valve rod downwards and pushes the diversion port sealing gasket downwards through the small valve rod, so that the diversion port sealing gasket seals the diversion port, in the process, if the small valve rod is short, the elasticity of the pre-tightening spring can make up the shortage size of the pre-tightening spring, so that the sealing gasket tightly seals the diversion port, when the small valve rod is long, the spring is extruded and shortened, thereby avoiding abnormal sound caused by untight adsorption of the movable iron core and the static iron core due to the overlong part of the small valve rod, after the diversion port is sealed, the pressure in the upper cavity of the valve cannot be relieved, so that the pressure in the upper cavity of the valve is slowly increased, and further driving the piston component to overcome the pulling force of the main spring to move downwards, so that the ejector rod on the plug head seals the main valve port, and a passage between, at the moment, the gas circuit of the whole valve is in a cut-off state; when the coil assembly is powered off again, the plug head is away from the pilot channel again under the action of the compression spring, the valve is wholly in a normally open state again at the moment, and the gas circuit keeps unobstructed again.

The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, it is possible to make several improvements and modifications without departing from the technical principle of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention.

Claims

1. A self-compensating normally open solenoid valve comprises a valve body, a valve cover fixedly arranged on the valve body and an electromagnetic assembly which is arranged on the valve cover and fixedly connected with the valve cover through a valve seat, wherein a fluid inlet and a fluid outlet are respectively arranged on the side wall of the valve body; a flow guide opening is formed in the valve cover, a flow guide channel communicated with the flow guide opening is formed in the valve cover and the valve body, and the flow guide channel is communicated with the fluid outlet; the electromagnetic assembly comprises a sleeve, a movable iron core, a static iron core and a coil assembly, the movable iron core is movably arranged in the sleeve, the top of the sleeve is fixedly connected with a cap matched with the stop of the movable iron core, the top of the static iron core is fixedly connected with the sleeve, the bottom of the static iron core is fixedly connected with the valve cover, the coil assembly is arranged on the outer wall of the sleeve, an air chamber is formed between the static iron core and the valve cover, a self-compensating device used for controlling the opening or closing of the flow guide opening is arranged in the air chamber, and the air chamber is communicated with the cavity above the valve through a pilot hole arranged in the valve cover, and the electromagnetic assembly is characterized in that: the self-compensating device comprises a small valve rod, a pre-tightening spring arranged in a cavity at the lower part of the small valve rod and a diversion port sealing gasket fixed below the pre-tightening spring, wherein the upper surface of the pre-tightening spring is fixedly connected with the top of the cavity, and the self-compensating device is fixedly connected with the bottom of the air chamber through a normally open spring; the piston assembly comprises a plug head and an ejector rod fixedly arranged in the middle of the plug head, the ejector rod is in a multilayer ladder shape, and the plug head is fixedly connected with the top of a cavity on the valve through a main spring.

2. The self-compensating normally open solenoid valve according to claim 1, characterized in that: a convex structure is arranged in the valve body on one side of the fluid outlet, a guide groove is formed in the convex structure, the guide groove is located under the valve port and is matched with the ejector rod to be used for closing or opening the valve port, and a sealing gasket is further arranged on the ejector rod.

3. The self-compensating normally open solenoid valve according to claim 1, characterized in that: and a sealing ring is also arranged between the valve cover and the valve body.

4. The self-compensating normally open solenoid valve according to claim 1, characterized in that: and a sealing ring in sealing fit with the valve cover is embedded in the upper outer wall of the plug head, and the sealing ring is in sliding fit with the inner wall of the upper cavity of the valve.