CN112943939A

CN112943939A - Pilot valve

Info

Publication number: CN112943939A
Application number: CN202110125233.4A
Authority: CN
Inventors: 杨军社; 王丽然; 李峰; 王长勇; 乔彦军; 张宝卫; 韩前卫
Original assignee: Xian Aerospace Yuanzheng Fluid Control Co Ltd
Current assignee: Xian Aerospace Yuanzheng Fluid Control Co Ltd
Priority date: 2021-01-29
Filing date: 2021-01-29
Publication date: 2021-06-11

Abstract

The invention discloses a pilot valve. The disclosed valve comprises a valve body, a piston and a pilot valve pressing plate, wherein a first working chamber, a second working chamber, a first through hole, a second through hole and a pilot channel are arranged in the valve body; a second pilot hole is formed in the pilot valve pressing plate; the pilot valve pressing plate is hermetically arranged between the first working chamber and the second working chamber, and the second pilot hole penetrates through the first working chamber and the second working chamber; the bottom of the piston is provided with a first pilot hole, and the piston is movably arranged in the first working cavity along the axial direction. The valve of the present invention adopts a new pilot technology. And the large-opening valve can be driven by the low-power coil, and meanwhile, a manual device is arranged, so that manual and electric dual driving is realized.

Description

Pilot valve

Technical Field

The invention belongs to the field of valves, is applied to an aviation auxiliary oil filling vehicle system, and particularly relates to a pilot electromagnetic valve with a manual device.

Background

In an aviation auxiliary fuel filling vehicle system, a normally closed oil way stop valve with a manual device is needed in a fuel filling loop, and the medium is gasoline, aviation lubricating oil and the like. The stop valve can realize manual opening and closing of the valve and can be driven by 12V direct current voltage to open and close, and meanwhile, due to the fact that a gasoline medium exists, the stop valve needs to meet the requirements of low coil power, small heat productivity and the like on the premise of meeting the requirement of large flow. The existing valves in the market cannot meet the use requirements.

Disclosure of Invention

Aiming at the defects or shortcomings of the prior art, the invention provides a pilot valve.

Therefore, the pilot valve provided by the invention comprises a valve body, a piston and a pilot valve pressing plate; a first working cavity, a second working cavity, a first through hole, a second through hole and a pilot channel are arranged in the valve body, the first working cavity and the second working cavity are communicated in the axial direction, the upper end of the second working cavity in the axial direction is open, a medium inlet and a medium outlet are arranged on the valve body, the medium inlet is communicated with the first working cavity through the first through hole, the medium outlet is communicated with the first working cavity through the second through hole, the medium outlet is communicated with the pilot channel at the same time, and the pilot channel is communicated with the second working cavity; the piston is of a cylinder structure with an opening at one end, a first pilot hole is formed at the bottom or the lower part of the piston, and the axial size of the piston is smaller than that of the first working cavity; a second pilot hole is formed in the pilot valve pressing plate; the pilot valve pressing plate is arranged in the valve body in a sealing mode and located between the first working cavity and the second working cavity, and the second pilot hole penetrates through the first working cavity and the second working cavity; the piston is movably arranged in the first working cavity along the axial direction to divide the first working cavity into a piston lower cavity and a piston upper cavity, the piston lower cavity is communicated with the piston upper cavity through a first pilot hole, the medium inlet is communicated with the piston lower cavity through a first through hole, and when the piston moves to a corresponding position along the axial direction, the piston seals the second through hole.

Further, a first spring is arranged in the cylinder body of the piston, and the upper end of the first spring is connected or contacted with the pilot valve pressing plate.

Further, the pilot valve pressing plate comprises a main plate and a side wall arranged on the main plate, a second pilot hole is arranged on the main plate, and a third pilot hole is arranged on the side wall; the inner diameter of the second working cavity is larger than that of the working cavity, the pilot valve pressing plate is arranged in the valve body in a sealing mode and located between the first working cavity and the second working cavity, meanwhile, the side wall is located in the second working cavity, and the third pilot hole is communicated with the pilot channel through the second working cavity.

Further, the pilot channel is opened along the axial direction.

Further, in the axial direction, the medium inlet and the medium outlet are located below the first working chamber, the first through hole and the second through hole are located at the bottom of the first working chamber, the medium inlet and the medium outlet are located at the same horizontal position, and the first axial direction is perpendicular to the horizontal position.

Furthermore, the cross section of the second through hole is circular, and the circle center is positioned on the central axis of the working cavity; the cross section of the first through hole is arc-shaped, and the first through hole is positioned beside the second through hole.

Furthermore, the first pilot hole is arranged on the side wall close to the bottom of the piston, the outer diameter of the upper structure of the first pilot hole of the piston is matched with the inner diameter of the working cavity, and the outer diameter of the lower structure of the first pilot hole of the piston is smaller than the inner diameter of the working cavity.

Further, the first pilot hole is disposed obliquely with respect to the axial direction.

Further, a sealing structure is arranged at the bottom of the piston.

And the control assembly is arranged at the opening of the second working cavity in an axial sealing manner and is used for controlling the opening and closing of the second pilot hole.

Furthermore, the control assembly is an electromagnet control assembly, the electromagnet control assembly comprises a guide sleeve part, a coil assembly arranged outside the guide sleeve part, an armature assembly movably arranged inside the guide sleeve part, a second spring arranged inside the armature assembly, a spring ejector rod arranged on the upper portion of the second spring, and a connector arranged outside the coil assembly, and the armature assembly is arranged above the second pilot hole to control the second pilot hole to open and close.

Furthermore, the manual assembly comprises a manual valve rod, one end of the manual valve rod is arranged in the guide sleeve component and is in contact with the armature component, the other end of the manual valve rod extends out of the guide sleeve component, and the other end of the manual valve rod is provided with a locking nut and a hand wheel.

The valve of the present invention adopts a new pilot technology. And the large-opening valve can be driven by the low-power coil, and meanwhile, a manual device is arranged, so that manual and electric dual driving is realized.

Drawings

FIG. 1 is a schematic structural reference diagram of a pilot valve in a closed state according to the present invention;

FIG. 2 is a schematic structural reference view of the valve body of FIG. 1, wherein the lower view is a top view of the upper view;

FIG. 3 is a schematic view of a structural reference of the piston of FIG. 1;

fig. 4 is a schematic view of a structural reference of the pilot valve pressure plate of fig. 1, wherein the lower view is a top view of the upper view;

FIG. 5 is a schematic structural reference diagram of the pilot valve of the present invention in an open state;

FIG. 6 is a schematic view of a guide sleeve component;

FIG. 7 is a schematic view of an armature assembly;

fig. 8 is a schematic view of the armature base structure.

Detailed Description

Unless otherwise specified, the terminology herein is to be understood in accordance with the conventional knowledge of one of ordinary skill in the relevant art.

Unless otherwise indicated, the axial direction is the moving direction of the piston, and the terms of direction or orientation such as inner, upper, lower, bottom, horizontal and the like are consistent with the corresponding directions or orientations in the drawings. The terms are intended to describe various parts, structures of components and positional relationships of parts to parts in the aspects of the invention, and the related parts or components are not limited to the directions or orientations in the drawings, and equivalents thereof based on the inventive concept disclosed herein are within the scope of the invention.

Referring to fig. 1-4, structurally, the pilot valve of the present invention mainly comprises a valve body 1, a piston 2 disposed in the valve body, and a pilot valve pressing plate 4 disposed on the valve body; wherein: a first working cavity 131 and a second working cavity 132 which are axially communicated are formed in the valve body 1 along one axial direction, wherein the upper axial end of the second working cavity 132 is open, meanwhile, a first through hole 10, a second through hole 13 and a pilot channel 15 are formed in the valve body, a medium inlet 11 and a medium outlet 12 are further formed in the valve body 1 outwards, the medium inlet 11 is communicated with the first working cavity 131 through the first through hole 10, the medium outlet 12 is communicated with the first working cavity 131 through the second through hole 13, the medium outlet 12 is communicated with the pilot channel 15, and the pilot through hole 15 is communicated with the second working cavity;

the piston 2 is a cylinder structure with an open end, a first pilot hole 14 is arranged at the bottom or the lower part of the piston, and the axial size of the piston is smaller than that of the first working cavity;

the pilot valve pressing plate 4 is provided with a second pilot hole 41;

the assembly mode of the parts is as follows: the pilot valve pressure plate 4 is hermetically installed in the valve body 1 and located between the first working chamber 131 and the second working chamber 132, and simultaneously penetrates through the first working chamber 131 and the second working chamber 132 through the second pilot hole 41; the piston 2 is movably arranged in the first working cavity 131 of the valve body, the opening ends of the two parts are in the same direction, the piston divides the first working cavity into a piston upper cavity and a piston lower cavity, the piston lower cavity is communicated with the piston upper cavity through a first guide hole, the medium inlet is communicated with the piston lower cavity through a first through hole, and when the piston moves to the bottom end of the first working cavity, the piston can seal a second through hole.

Based on the structure, the pilot valve can realize the communication of different ports and holes in the working process, such as when the piston 2 moves to different positions in the first working cavity, namely the bottom of the piston and the working surface of the first working cavity are superposed like different horizontal working surfaces and the bottom of the middle part.

When no external control force acts, referring to fig. 1, the second pilot hole 41 is closed by the control element or the control valve core, after the medium enters from the medium inlet 11, the medium firstly enters the piston lower cavity through the first through hole, and then enters the piston upper cavity through the first pilot hole 14 on the piston, a pressure difference is formed between the piston upper cavity and the piston lower cavity, and the piston is pressed on the second through hole of the valve body to seal the valve under the action of the pressure difference, meanwhile, the second working cavity 132 and the pilot channel 15 are communicated with the medium outlet 12 and have the same pressure with the piston lower cavity (i.e. the second through hole is communicated with the medium outlet); the lower cavity of the pilot valve pressure plate (namely the upper piston cavity) has the same pressure with the medium inlet 11; in this state, the valve is in a closed state;

when the valve needs to be opened, after the second pilot hole 41 is opened by means of electromagnetic force and mechanical force, referring to fig. 5, the medium in the lower cavity of the pilot valve pressing plate enters the medium outlet 12 through the second pilot hole 41, the second working chamber 132 and the pilot channel 15, the pressure in the lower cavity of the pilot valve pressing plate is reduced, the piston leaves the valve body under the pushing of the medium force, the second through hole is gradually opened, and the valve is opened;

then, the second pilot hole 41 is closed, and the medium force in the lower cavity of the pilot valve pressure plate presses the piston on the main valve seat to close the valve;

the pilot valve is opened and closed by working as above.

In order to realize the work more reliably, further, a main return spring 3 is arranged between the pilot valve pressure plate and the piston, the spring is arranged in the cylinder structure of the piston, the upper end of the spring is connected or contacted with the pilot valve pressure plate, and the main return spring is used for assisting the piston to return to seal the valve body.

Considering the factors of the processing technology, the processing cost, the installation and the like, an alternative solution is that on the basis of the above solution, the side wall of the lower part of the piston near the bottom is provided with the first pilot hole 14, as shown in fig. 3, meanwhile, the outer diameter of the upper structure of the first pilot hole 14 of the piston 4 is larger than that of the lower structure, and the outer diameter of the upper structure is matched with the inner diameter of the first working cavity, so that the upper structure is installed in the first working cavity to form the lower piston cavity. Further optionally, the first pilot hole 14 is arranged obliquely with respect to the axial direction.

Also considering the factors of the processing technology, the processing cost and the installation, as shown in fig. 4, there is an alternative that the pilot valve pressing plate 4 includes a main plate and a side wall 43 arranged on the main plate, the main plate is provided with a second pilot hole 41, and the side wall is provided with a third pilot hole 42; correspondingly, the inner diameter of the second working chamber 132 in the valve body is larger than the inner diameter of the first working chamber 131, the pilot valve pressing plate is hermetically installed between the first working chamber and the second working chamber, and specifically, the pilot valve pressing plate can be hermetically connected with the valve body through a first sealing ring 5, meanwhile, the side wall 43 on the main plate is located in the second working chamber 132, and the third pilot hole 42 on the side wall is communicated with the pilot channel 15 through the second working chamber 132. Further optionally, the pilot channel 15 is open along the axial direction.

In some preferred embodiments, the first through hole 10 and the second through hole 13 are located at the bottom of the first working chamber 131, and the medium inlet 11 and the medium outlet 12 are located below the first working chamber 131 at the same level, which is perpendicular to the axial direction.

It should be explained that, in order to achieve the pilot function of the valve according to the invention, the cross-sectional dimension or the bore of the area in the name of the "pilot bore or pilot channel" is smaller than the cross-sectional dimension or the bore of the area in the name of the "port" (e.g. through-port, medium inlet, medium outlet). The cross sections of the first through hole 10 and the second through hole 13 are circular and coaxial with the first working cavity, and the cross sections of the two through holes meet the requirement of medium circulation when the valve is opened.

It should be further explained that the relevant connection parts in the pilot valve of the present invention need to be assembled and connected by using a sealing structure or have a corresponding sealing structure, and the sealing structure is implemented by using the existing technology, including an O-ring and a sealing band, for example, a T-shaped sealing ring band is provided at the lower part of the piston 2, and the second through hole is sealed during operation, so as to separate the medium inlet and the medium outlet to implement the valve closing. The material of the sealing ring, the sealing ring belt or the sealing block can be selected from suitable sealing materials, such as but not limited to rubber, vulcanized rubber and the like.

In a further scheme or product, a control assembly capable of controlling the opening or closing of the second pilot hole is installed on the valve body, and the control assembly is installed at the opening of the second working cavity in a sealing mode.

In the specific scheme, an automatic control assembly such as an electromagnetic control assembly or a manual mechanical control assembly can be selected according to the control requirement or the actual situation, and the two modes can also be combined.

Wherein the electromagnetic control assembly can be selected from the existing solenoid control assembly suitable for valve control or the solenoid control assembly improved based on the principle of the invention. In order to ensure that the present invention can be more clearly understood by those skilled in the art, a specific electromagnetic control assembly is provided herein, and referring to fig. 1 or fig. 2, the electromagnetic control assembly 7 includes a guide sleeve part 71, a coil assembly 72 disposed outside the guide sleeve part 71, an armature assembly 73 movably disposed inside the guide sleeve part 71, a second spring, also called a secondary spring 74, disposed inside the armature assembly 73, a spring ejector 75 disposed on the upper portion of the secondary spring 74, and a connector 76 disposed outside the coil assembly 72; the secondary spring 74 is placed within the armature assembly; wherein the guide sleeve component is hermetically arranged at the opening of the second working cavity through a second sealing ring 6.

More specifically, as shown in fig. 6, the guide sleeve part 71 includes a guide sleeve 713, an upper stop 711 disposed on the top of the guide sleeve, and a choke 712 disposed on the bottom of the guide sleeve; the armature component 73 is movably arranged in the guide sleeve 713, and the choke 712 is in sealing connection with the opening of the second working chamber; as shown in fig. 7 and 8, the armature assembly 73 includes an armature base 731, a first working hole 7312 is axially formed at the top of the armature base, the secondary spring 74 and the spring ejector 75 are installed in the first working hole, a second working hole 7313 is axially formed at the bottom of the armature base, the compensation spring 732, an ejector 733 disposed at the lower part of the compensation spring 732 and a rubber seal 734 disposed at the lower part of the ejector 733 are installed in the second working hole, meanwhile, a flow hole 7311 is radially formed in the side wall of the armature base 731, and a medium at the upper part of the ejector 733 flows in and out when the ejector 733 moves up and down.

The specific structure of the pilot valve shown in fig. 1 and 2 is a combination of the above solutions, and the solution of the present invention is not limited to the structure shown in fig. 1, and those skilled in the art can selectively combine the above solutions or features based on the concept of the present invention, and all such solutions or features are within the protection scope of the present invention. The working process of the structural product shown in the combined figures 1 and 2 comprises the following steps:

after entering from the inlet 11, the medium enters the upper cavity of the piston through the first pilot hole 14 on the piston, pressure difference is formed between the upper cavity and the lower cavity of the piston, and the piston 2 is pressed on the main valve seat of the valve body under the action of the pressure difference to seal the valve; meanwhile, the secondary spring 74 at the top of the armature assembly 73 presses the armature assembly on the valve pressing plate 4 to close the second pilot hole, and the piston upper cavity is divided into a valve pressing plate upper cavity and a valve pressing plate lower cavity; wherein the upper cavity of the valve pressing plate is communicated with the outlet 12 through a pilot channel 15 on the side surface of the valve body and has the same pressure with the lower cavity of the piston; the pressure of the lower cavity of the valve pressing plate 4 is consistent with that of the inlet 11;

when the valve needs to be opened, 12V direct current voltage is applied to the electromagnetic coil, the armature component 73 overcomes the auxiliary spring 74 to move upwards under the action of electromagnetic attraction, the second pilot hole 41 on the valve pressing plate is opened, the medium in the lower cavity of the valve pressing plate enters the outlet 12 through the side hole 15 of the valve body, the pressure in the lower cavity of the valve pressing plate 4 is reduced, and the piston pushes the valve to open under the action of the medium force, as shown in FIG. 2;

when the solenoid is de-energized, the armature assembly 73 moves downward under the force of the secondary spring force 74, compressing the armature assembly against the valve platen 4, dividing the upper piston chamber into an upper valve platen chamber and a lower valve platen chamber, with the valve platen 4 chamber medium force compressing the piston against the main valve seat to close the valve, as shown in fig. 1.

A further proposal or product is that a manual mechanical control assembly is arranged on the electromagnet control assembly, as shown in fig. 1 or 2, the manual assembly 9 comprises a manual valve rod 92, the manual valve rod 92 is arranged in the guide sleeve part 71, specifically, a valve rod guide hole 7110 is arranged on an upper stop iron 711 of the guide sleeve part along the axial direction, the manual valve rod is arranged in the valve rod guide hole 7110, and the manual valve rod and the valve rod are sealed, specifically, sealed by a sealing ring 95; the manual valve rod 92 is installed in the valve rod guide hole 7110 of the upper stop iron and contacts with the spring push rod at the bottom.

In a further scheme, a hand wheel 94 is arranged at the upper end of the manual valve rod. Or/and the outer end of the manual valve rod is provided with a nut 8, and the nut 8 is sequentially provided with a lower locking nut 91 and a lower locking nut 92; the manual valve rod 92 penetrates through a nut and is screwed into a valve rod guide hole 7110 of the upper stop iron to be in contact with a spring ejector rod at the bottom, the hand wheel is in locking connection with the manual ejector rod 92 through a locking nut arranged at the lower part of the hand wheel, the hand wheel is rotated, the valve rod 92 moves upwards, the spring ejector rod moves upwards under the action of the force of the spring 74, the spring force value is reduced, and the armature component is ejected by medium force to open the valve; when the valve needs to be opened manually, the hand wheel is rotated to enable the manual valve rod to move upwards, and the pressing force of the spring is reduced to remove the sealing between the armature and the pilot valve seat, so that the valve is opened. The manual control assembly can realize that a small-power coil drives a large-opening valve on the basis of a pilot valve technology, and a manual device is arranged to realize manual and electric double driving.

Claims

1. A pilot valve comprises a valve body and a piston and is characterized by further comprising a pilot valve pressing plate;

a first working cavity, a second working cavity, a first through hole, a second through hole and a pilot channel are arranged in the valve body, the first working cavity and the second working cavity are communicated in the axial direction, the upper end of the second working cavity in the axial direction is open, a medium inlet and a medium outlet are arranged on the valve body, the medium inlet is communicated with the first working cavity through the first through hole, the medium outlet is communicated with the first working cavity through the second through hole, the medium outlet is communicated with the pilot channel at the same time, and the pilot channel is communicated with the second working cavity;

the piston is of a cylinder structure with an opening at one end, a first pilot hole is formed at the bottom or the lower part of the piston, and the axial size of the piston is smaller than that of the first working cavity;

a second pilot hole is formed in the pilot valve pressing plate;

the pilot valve pressing plate is arranged in the valve body in a sealing mode and located between the first working cavity and the second working cavity, and the second pilot hole penetrates through the first working cavity and the second working cavity;

the piston is movably arranged in the first working cavity along the axial direction to divide the first working cavity into a piston lower cavity and a piston upper cavity, the piston lower cavity is communicated with the piston upper cavity through a first pilot hole, the medium inlet is communicated with the piston lower cavity through a first through hole, and when the piston moves to a corresponding position along the axial direction, the piston seals the second through hole.

2. The pilot valve as claimed in claim 1, wherein a first spring is provided in the cylinder of the piston, and an upper end of the first spring is connected to or in contact with the pilot valve pressure plate, and a telescopic direction of the first spring is along the axial direction.

3. The pilot valve as claimed in claim 1, wherein the pilot valve pressing plate comprises a main plate and a side wall provided on the main plate, the main plate being provided with a second pilot hole, the side wall being provided with a third pilot hole;

the inner diameter of the second working cavity is larger than that of the working cavity, the pilot valve pressing plate is arranged in the valve body in a sealing mode and located between the first working cavity and the second working cavity, meanwhile, the side wall is located in the second working cavity, and the third pilot hole is communicated with the pilot channel through the second working cavity.

4. A pilot valve as claimed in claim 1 or 3, wherein said pilot passage opens in said axial direction.

5. The pilot valve of claim 1, wherein the media inlet and the media outlet are located below the first working chamber in the axial direction, the first through hole and the second through hole are located at the bottom of the first working chamber, and the media inlet and the media outlet are located at the same horizontal position, and the first axial direction is perpendicular to the horizontal position.

6. The pilot valve as claimed in claim 1 or 5, wherein the cross section of the second through hole is circular, and the center of the circle is located on the central axis of the working chamber; the cross section of the first through hole is arc-shaped, and the first through hole is positioned beside the second through hole.

7. The pilot valve as claimed in claim 1, wherein the first pilot hole is provided in a side wall adjacent a bottom of the piston, an upper structural outer diameter of the first pilot hole of the piston matching an inner diameter of the working chamber, and a lower structural outer diameter being smaller than the inner diameter of the working chamber.

8. A pilot valve as claimed in claim 1 or 7, wherein said first pilot bore is arranged obliquely to said axial direction.

9. The pilot valve as claimed in claim 1, wherein a sealing structure is provided at a bottom of the piston.

10. The pilot valve as recited in claim 1, further comprising a control assembly sealingly disposed axially at said second working chamber opening for controlling the opening and closing of the second pilot bore.

11. The pilot valve as set forth in claim 10, wherein said control assembly is an electromagnet control assembly including a guide sleeve member, a coil assembly disposed outside said guide sleeve member, an armature assembly movably disposed inside said guide sleeve member, a second spring disposed inside said armature assembly, a spring push rod disposed on an upper portion of said second spring, and a connector disposed outside said coil assembly, said armature assembly being disposed above said second pilot hole to control opening and closing of said second pilot hole.

12. The pilot valve as recited in claim 10, further comprising a manual assembly including a manual valve stem having one end disposed inside the guide bushing member and contacting the armature assembly and the other end extending to the outside, and the other end provided with a locking nut and a hand wheel.