CN218543198U

CN218543198U - Pilot valve group and pilot type electromagnetic valve

Info

Publication number: CN218543198U
Application number: CN202223201402.7U
Authority: CN
Inventors: 何芙蓉; 刁延飞; 申铁柱; 邱捷
Original assignee: Changzhou Hengli Pneumatic Technology Co ltd
Current assignee: Changzhou Hengli Pneumatic Technology Co ltd
Priority date: 2022-11-30
Filing date: 2022-11-30
Publication date: 2023-02-28
Anticipated expiration: 2032-11-30

Abstract

The utility model relates to the technical field of solenoid valves, in particular to a pilot valve group and a pilot type solenoid valve, which comprises a base, a static iron core, a coil, a spring, a movable iron core and a limiter; an installation cavity with an opening at one end is formed in the base, and the static iron core is fixed at the bottom of the installation cavity; the movable iron core and the static iron core are arranged oppositely, and can move relatively in the installation cavity along the direction close to or far from the movable iron core; the movable iron core is provided with an outward turning part which extends in a direction vertical to the axial direction of the fixed iron core at one end far away from the fixed iron core, and the stopper is fixed at the opening of the mounting cavity; wherein, the stopper is the elastic material, and the stopper is configured to move the iron core towards quiet iron core removal in-process, and the portion of turning up makes to move the iron core and stops and move and have the settlement distance between iron core bottom and the quiet iron core with the stopper contact to avoid moving iron core and quiet iron core contact. The utility model discloses a setting up of stopper has realized amortization, spacing, sealed and has reduced the effect of starting pressure.

Description

Pilot valve group and pilot type electromagnetic valve

Technical Field

The utility model relates to a solenoid valve technical field especially relates to a guide's valves and guide's formula solenoid valve.

Background

The pilot electromagnetic valve mainly comprises a pilot valve group and a main valve, wherein the pilot valve group is a control mechanism for operating the main valve to act, a process channel is arranged at the inlet end of the general main valve to enable a medium to be communicated with the pilot valve group, and the pilot valve group is opened and closed by powering on and powering off the pilot valve group, so that the pilot valve controls the main valve to complete the opening and closing functions;

in the related art, when the pilot valve group acts, the coil applies electromagnetic force to the movable iron core to overcome the elastic force of the spring to generate movement until the movable iron core collides with the static iron core and stops, so that the collision sound can be generated when the pilot valve group is opened or closed, and the phenomenon is more obvious in a high-frequency pilot type electromagnetic valve; therefore, how to reduce the noise of the pilot valve group during operation is a problem to be solved.

SUMMERY OF THE UTILITY MODEL

In view of at least one in the above technical problem, the utility model provides a pilot valve group and pilot-operated solenoid valve adopts the stopper to realize the restriction to moving the iron core formation, and then reduces the noise of pilot valve group when the action.

According to a first aspect of the present invention, there is provided a pilot valve set, comprising a base, a stationary core, a coil, a spring, a movable core, and a stopper;

the base is internally provided with an installation cavity with an opening at one end, the static iron core is fixed at the bottom of the installation cavity, and the coil is arranged in the base and surrounds the bottom of the installation cavity where the static iron core is located;

the movable iron core and the static iron core are oppositely arranged and can be relatively movably arranged along the direction close to or far away from the movable iron core in the installation cavity, and the spring is connected with the static iron core and used for resetting the movable iron core;

the movable iron core is provided with an outward turning part which extends in a direction vertical to the axial direction of the fixed iron core at one end far away from the fixed iron core, and the stopper is fixed at the opening of the installation cavity;

the stopper is made of elastic materials, and is configured to be in the process that the movable iron core moves towards the static iron core, the outward turning part is in contact with the stopper so that the movable iron core stops, and a set distance is reserved between the bottom of the movable iron core and the static iron core, so that the movable iron core is prevented from being in contact with the static iron core.

In some embodiments of the present invention, the magnetic isolation device further comprises a magnetic isolation cylinder, the magnetic isolation cylinder is fixed in the installation cavity, and the bottom of the magnetic isolation cylinder is in contact with the movable iron core;

the movable iron core is sleeved in the magnetism isolating cylinder and can be arranged in the magnetism isolating cylinder in a relatively movable mode;

one end of the spring is fixed at the bottom of the magnetic isolation cylinder, and the other end of the spring is connected with the static iron core.

In some embodiments of the present invention, the base is provided with a limiting portion at an opening end of the installation cavity, the limiting portion is in a stepped groove structure, and the limiter is fixed in the limiting portion.

In some embodiments of the present invention, the limiting portion includes a first step groove and a second step groove disposed above the first step groove, the open end of the magnetism isolating cylinder has a flange, the flange is fixed in the first step groove, and the limiter is fixed in the second step groove.

In some embodiments of the present invention, the stationary core is far away from the movable core, and a cavity is further disposed on one end of the movable core, and an end cap is embedded in the cavity.

In some embodiments of the present invention, the stopper is an annular seal gasket, and the outer edge of the outward turned portion is larger than the inner edge of the stopper.

The utility model discloses an in some embodiments, still have at least one on the interior edge of stopper and open the groove, open the top surface in groove and the orientation the setting is opened to the direction on edge in the stopper, open the lateral wall distance in groove the distance at stopper center is greater than turn up extremely the distance at movable core center.

In some embodiments of the present invention, the end surface of the stopper is provided with at least one circle of sealing strips protruding outside the opening groove.

In some embodiments of the present invention, the stopper is made of hydrogenated nitrile rubber.

According to the utility model discloses a second aspect still provides a pilot operated solenoid valve, including the main valve and with what the main valve is connected is as any one of the first aspect the pilot valve valves, the pilot valve valves is used for controlling the switching of main valve.

The utility model has the advantages that: the utility model discloses a setting of stopper of elasticity material for move the in-process that the iron core removed towards quiet iron core, move the iron core earlier with the stopper contact, and then restricted the displacement who moves the iron core, avoided moving the direct contact of iron core and quiet iron core, thereby reduced and moved the noise that iron core and quiet iron core collision sent, especially in the high frequency solenoid valve, noise cancelling effect is more obvious.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural view of the pilot valve set when closed in the embodiment of the present invention;

fig. 2 is a schematic structural view of the pilot valve set when opening in the embodiment of the present invention;

fig. 3 is a cross-sectional view of a pilot valve group in the embodiment of the present invention;

fig. 4 is an exploded schematic view of a pilot valve set according to an embodiment of the present invention;

fig. 5 is another exploded schematic view of the pilot valve assembly according to the embodiment of the present invention;

fig. 6 is a partial enlarged view of a portion a in fig. 5 according to an embodiment of the present invention;

FIG. 7 is a partial enlarged view of the embodiment of the present invention shown in FIG. 3;

fig. 8 is a sectional view of the movable iron core in the embodiment of the present invention;

fig. 9 is a schematic structural view of a stopper according to an embodiment of the present invention;

fig. 10 is a cross-sectional view of a stopper according to an embodiment of the present invention;

fig. 11 is a schematic structural view of a pilot-operated solenoid valve according to an embodiment of the present invention;

fig. 12 is a sectional view taken along the direction C-C in fig. 11 according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a single embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The pilot valve group shown in fig. 1 to 10 includes a base 1, a stationary core 2, a coil 3, a spring 5, a movable core 4, and a stopper 6; fig. 1 shows a state in which the pilot valve group is closed, in which the coil 3 is not energized, and the movable iron core 4 is kept closed by the pressure of the spring 5; fig. 2 shows a state in which the pilot valve group is opened, in which the coil 3 is energized, and the stationary iron core 2 attracts the movable iron core 4 to move downward, so that the pilot valve group is opened;

as shown in fig. 3 and 4 in particular, the base 1 has an installation cavity 11 with an opening at one end, the static iron core 2 is fixed at the bottom of the installation cavity 11, and the coil 3 is arranged in the base 1 and around the bottom of the installation cavity 11 where the static iron core 2 is located; in the embodiment of the present invention, the coil 3 is embedded inside the base 1, and the coil 3 is disposed around the static iron core 2, so that when the coil 3 is powered on, the magnetic induction line is gathered at the end of the static iron core 2, and the movable iron core 4 is adsorbed, so that the movable iron core 4 moves toward the static iron core 2;

the movable iron core 4 is arranged opposite to the static iron core 2 and can move relatively in the installation cavity 11 along the direction close to or far away from the movable iron core 4, and the spring 5 is connected with the static iron core 2 and used for resetting the movable iron core 4; in the embodiment of the present invention, the spring 5 plays a role of resetting, and when the coil 3 is de-energized, the movable iron core 4 is restored to the closed state under the action of the spring 5, so as to keep the normally closed state of the pilot valve set; it should be noted that, in the embodiment of the present invention, the pilot valve group may also be set to be in a normally open mode, that is, the acting force of the spring 5 is set to be in a stretching state, so that the spring 5 stretches the movable iron core 4 when the coil 3 is not energized, so that the movable iron core 4 is kept normally open, then the movable iron core 4 is magnetic steel, and when the coil 3 is energized, the movable iron core 4 is pushed to move towards a direction away from the stationary iron core 2, so as to close the movable iron core 4; the action forms of the normally open or normally closed pilot valve group are all within the protection scope of the utility model;

referring to fig. 4, in the embodiment of the present invention, the movable iron core 4 has an outward turning portion 41 extending perpendicular to the axial direction of the stationary iron core 2 at an end thereof away from the stationary iron core, and the stopper 6 is fixed at the opening of the mounting cavity 11; the stopper 6 is made of elastic material, and the stopper 6 is configured to make the movable iron core 4 stop and to have a set distance between the bottom of the movable iron core 4 and the stationary iron core 2 by contacting the outward turning part 41 and the stopper 6 in the moving process of the movable iron core 4 towards the stationary iron core 2, so as to avoid the contact of the movable iron core 4 and the stationary iron core 2. Like this, move the in-process that iron core 4 removed towards quiet iron core 2, move the portion 41 of turning up of iron core 4 and contact with elastic stopper 6 earlier for move the bottom of iron core 4 and not contact with quiet iron core 2, and then avoided moving the collision between iron core 4 and the quiet iron core 2, realized moving the amortization function when iron core 4 moves.

In the above embodiment, through the setting of stopper 6 of elastic material for move the in-process that iron core 4 removed towards quiet iron core 2, move iron core 4 earlier with stopper 6 contact, and then restricted the displacement distance who moves iron core 4, avoided moving iron core 4 and quiet iron core 2's direct contact, thereby reduced and moved the noise that iron core 4 and quiet iron core 2 collision sent, especially in the high frequency solenoid valve, the noise cancelling effect is more obvious.

On the basis of the above embodiment, as shown in fig. 3 and 5, the magnetic isolation device further comprises a magnetic isolation cylinder 7, wherein the magnetic isolation cylinder 7 is fixed in the installation cavity 11, and the bottom of the magnetic isolation cylinder 7 is in contact with the movable iron core 4; the movable iron core 4 is sleeved in the magnetism isolating cylinder 7 and can be arranged in the magnetism isolating cylinder 7 in a relatively movable mode; one end of the spring 5 is fixed at the bottom of the magnetism isolating cylinder 7, and the other end is connected with the static iron core 2. Through the arrangement of the magnetism isolating cylinder 7, the magnetic induction line passes through the bottom of the magnetism isolating cylinder 7 and is limited in the magnetism isolating cylinder 7, so that the magnetism isolating cylinder 7 achieves the effect of magnetic shielding, and the influence of electromagnetic induction on other parts is reduced; regarding the connection of the spring 5, it can be fixed by welding or mechanical connection, in the embodiment of the present invention, as shown in fig. 3, the movable iron core 4 is set to be a cylindrical structure, and a part of the diameter of the sleeved spring 5 is smaller, and the part is the compression space of the spring 5. It should be noted that, in the embodiment of the present invention, the structural forms of the movable iron core 4 and the stationary iron core 2 are not limited to the circular structures shown in the drawings, and may be set to other structural forms as needed.

Referring to fig. 5 and 6, in the embodiment of the present invention, the base 1 has a limiting portion 12 at an opening end of the mounting cavity 11, the limiting portion 12 is in a stepped groove structure, and the limiter 6 is fixed in the limiting portion 12. Referring to fig. 7, in the embodiment of the present invention, the limiting portion 12 includes a first step groove 12a and a second step groove 12b disposed above the first step groove 12a, the opening end of the magnetism isolating cylinder 7 has a flange, the flange is fixed in the first step groove 12a, and the limiter 6 is fixed in the second step groove 12 b. Through the arrangement of the structural form, on one hand, the magnetic isolation cylinder 7 and the limiter 6 are reliably fixed by utilizing the step type structure, and on the other hand, the limiter 6 plays a role in sealing through the structural form of the step.

In order to improve the reliability of the switch when the movable iron core 4 acts, as shown in fig. 8, a reducing cavity 42 is further arranged at one end of the static iron core 2 far away from the movable iron core 4, and a plug 8 is embedded in the reducing cavity 42. The necking cavity 42 is arranged to be of a convex structure, the plug 8 is arranged to be of a structure with the bottom size larger than the upper size, the plug 8 is fixed in the mode, when the plug 8 needs to be replaced, the plug 8 is only required to be taken out by stretching and deforming the plug 8 through external force, the new plug 8 is replaced in an extrusion mode, through the arrangement of the mode, the direct contact between the movable iron core 4 and a valve port is avoided, and the service life of the movable iron core 4 is prolonged.

As for the specific structure of the stopper 6, as shown in fig. 9, the stopper 6 is an annular packing, and the dimension of the outer edge of the inside-out portion 41 from the center is larger than the dimension of the inner edge of the stopper 6 from the center. The distance center is that the limiter 6 and the movable iron core 4 are coaxially arranged, and the center is the distance from the axis, so that the outer part of the limiter 6 plays a role in sealing, and the inner part plays a role in limiting the movable iron core 4; thereby making the stopper 6 have the functions of sealing, limiting and silencing.

Referring to fig. 9 and 10, in the embodiment of the present invention, in order to prevent the outward turning portion 41 of the movable iron core 4 from generating negative pressure adsorption after contacting with the end surface of the stopper 6, at least one opening groove 61 is further provided on the inner edge of the stopper 6, the top surface of the opening groove 61 and the direction toward the inner edge of the stopper 6 are opened, and the distance from the outer sidewall of the opening groove 61 to the center of the stopper 6 is greater than the distance from the outward turning portion 41 to the center of the movable iron core 4. Through the arrangement of the opening groove 61, the outward turning part 41 of the movable iron core 4 is communicated with the magnetic isolation cylinder 7, so that when the movable iron core 4 acts, the force required by starting is reduced, and the energy-saving effect is achieved.

Further, with reference to fig. 10, the end surface of the stopper 6 further has at least one circle of sealing strips 62 protruding outside the opening groove 61. It should be noted here that the sealing in the embodiment of the present invention refers to the sealing between the outer wall of the magnetism isolating cylinder 7 and the inner wall of the installation cavity 11, and by the arrangement of the sealing strip 62, the sealing inside the installation cavity 11 is realized, and the service life of the component is prolonged; it should be noted that, a plurality of sealing strips 62 may be provided to achieve multiple sealing, so as to further improve the sealing effect. It should also be noted here that in the embodiment of the present invention, the stopper 6 is made of hydrogenated nitrile rubber. The hydrogenated nitrile rubber has good mechanical properties, and has higher reliability when contacting mineral oil or lubricating oil, wherein the working temperature range of the hydrogenated nitrile rubber is thirty ℃ below zero to one hundred and forty ℃.

In some embodiments of the present invention, there is also provided a pilot-operated solenoid valve as shown in fig. 11 and 12, including a main valve 9 and the above-mentioned pilot valve group connected to the main valve 9, the pilot valve group being used for controlling the opening and closing of the main valve 9. Specifically, when the coil 3 is energized, the pilot valve set is opened, the working medium in the diaphragm or piston chamber leaks to the outlet end of the valve through the pilot hole, and a part of the working medium enters the diaphragm or piston chamber through the balance hole, as shown in fig. 12, the medium pressure in the diaphragm or piston chamber drops sharply because the flow entering the balance hole is much smaller than the flow discharged from the pilot hole. The pressure of the medium below the diaphragm or the piston is still unchanged and is the same as that of the medium at the inlet, so that the diaphragm or the piston has pressure difference between the inside and the outside, and the diaphragm or the piston is lifted up by overcoming the self weight and the elastic force through the pressure difference so as to ensure that the working medium flows in the pipeline. When the coil 3 is powered off, the pilot valve is closed, the working medium in the working chamber of the main valve 9 cannot leak out, and the working medium from the inlet continuously flows into the chamber of the main valve 9 from the balance hole, so that the pressure inside and outside the piston gradually disappears and tends to balance. The main valve 9 then closes the main valve 9 port rapidly by its own weight and spring force, so that the working medium in the pipeline is cut off. It should be noted that the above working process is only an example of the present invention, and those skilled in the art can improve the path according to the working principle of the pilot valve, but the pilot type solenoid valve using the above pilot valve set structure all falls into the protection scope of the present invention. Furthermore, it should be noted here that the working medium in the embodiments of the present invention may be gas or liquid.

It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only illustrative of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the present invention, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A pilot valve group is characterized by comprising a base, a static iron core, a coil, a spring, a movable iron core and a limiter;

2. The pilot valve group according to claim 1, further comprising a magnetism isolating cylinder, wherein the magnetism isolating cylinder is fixed in the installation cavity, and the bottom of the magnetism isolating cylinder is in contact with the movable iron core;

3. The pilot valve group according to claim 2, wherein the base has a stopper portion at an opening end of the mounting cavity, the stopper portion having a stepped groove structure, the stopper being fixed in the stopper portion.

4. The pilot valve group according to claim 3, wherein the limiting portion comprises a first step groove and a second step groove disposed above the first step groove, the open end of the magnetism isolating cylinder is provided with a flange fixed in the first step groove, and the limiter is fixed in the second step groove.

5. The pilot valve group according to claim 1, wherein a reducing cavity is further formed in one end of the static iron core, which is far away from the movable iron core, and a plug is embedded in the reducing cavity.

6. The pilot valve group according to claim 1, wherein the retainer is an annular packing, and the outer edge of the outward-turned part has a dimension from the center larger than the inner edge of the retainer.

7. The pilot valve group according to claim 6, wherein the inner edge of the stopper further has at least one opening groove, the top surface of the opening groove and the direction towards the inner edge of the stopper are opened, and the distance from the outer side wall of the opening groove to the center of the stopper is greater than the distance from the outward turning part to the center of the movable iron core.

8. The pilot valve group according to claim 7, wherein the end surface of the stopper further has at least one ring of sealing strips protruding outside the opening groove.

9. Pilot valve group according to any of the claims 6 to 8, characterised in that the stop is of hydrogenated nitrile rubber.

10. A pilot-operated solenoid valve comprising a main valve and a pilot valve group according to any one of claims 1 to 9 connected to said main valve for controlling the opening and closing of said main valve.