CN108266562B - A kind of high-pressure gas flow amount control device - Google Patents

Abstract

The invention discloses a kind of high-pressure gas flow amount control devices, including flow valve, guide's servo valve and displacement sensor, flow valve includes valve body, valve seat, valve pocket, spool, valve pocket end cap, lower cover, spring fairlead and reset spring, valve body lower end face is fixed with lower cover, displacement sensor is fixed on lower cover, it is sequentially installed with spring from bottom to top in the axially extending bore of valve body, spring fairlead, valve pocket end cap, valve pocket, spool and valve seat, spool outer wall is sheathed with valve pocket, spool outer wall has annular convex platform, annular convex platform is located in the lower opening of valve pocket and the cavity of lower opening is divided into control chamber a and control chamber b, second is provided on valve body wall surface, third duct, second hole link control chamber a, third hole link control chamber b, guide's servo valve includes 3-position 4-way eletropneumatic servo valve, first, second electromagnetism Switch valve and connection valve block.High-pressure gas flow amount control device fast response time of the invention, control precision are high.

Description

A kind of high-pressure gas flow amount control device

Technical field

The invention belongs to pneumatic servo proportional control element fields, and in particular to a kind of big orifice high-pressure gas flow control Device.

Background technique

In pneumatics, working media is compressed air, facilitated with the energy, cleanliness without any pollution, low cost, easily The advantages that operation, pneumatics be widely used in agricultural machinery, automatic industrial, communications and transportation, the energy, chemical industry, aerospace, The fields such as navigation, defense military.

High pressure gas is since power ratio is great, rapid expanding ability is strong, it is dynamic to be effectively improved system relative to low-pressure system State property energy and rigidity, and be conducive to component structure miniaturization and executing agency's high speed, installation space can also be saved, therefore, High-pressure pneumatics becomes one of the research hotspot in current Fluid Transmission and Control field both at home and abroad.In pneumatic field, pressure Pneumatic system lower than 1MPa is known as low-pressure pneumatic system, pneumatic system of the pressure between 1MPa~10MPa be known as in calm the anger Dynamic system, pneumatic system of the pressure higher than 10MPa are known as high-pressure pneumatic system.

With various industries, particularly natural gas conveying, hydrogen energy source automobile, defense military industry to pneumatic system high pressure, High response, high-precision, the demand of continuous control increasingly increase, as well as various new materials, new process and high life device Appearance, effectively pushed the development of high-pressure pneumatics, the exploitation and development of novel high-pressure pneumatic element have become pneumatically The new developing direction of technology.

Over the past decade, the research work carried out both at home and abroad to high-pressure pneumatic element is concentrated mainly on high-pressure pneumatic switch valve In terms of pressure reducing valve, and the high-pressure pneumatic servo control technique of high response, high-precision, continuous control can be realized still in a step Section.Core element of the big orifice high-pressure gas flow adjustable valve as Large-scale High-Pressure pneumatic servo ratio control system, at present The bottleneck applied in Large-Scale Equipment as high-pressure pneumatic servo ratio control technology.

Big orifice high-pressure gas flow adjustable valve as a kind of control gas outflow amount/pressure pneumatic control components, Its application requirement that more demanding large-scale control equipment is able to satisfy in terms of control precision and dynamic response, is especially suitable for application In natural gas conveying, hydrogen energy source automobile, aerospace and national defense and military fields.

Therefore, for the demand, need to develop a kind of high-precision, high response, big orifice high-pressure gas flow adjustable valve, This is of great significance to the quick accurate control of Large-scale High-Pressure pneumatic system and engineering application value.

Summary of the invention

Aiming at the above defects or improvement requirements of the prior art, the present invention provides a kind of big orifice high-pressure gas flow controls Device processed, it is intended that by flow valve and the ingenious connection of guide's servo valve, to be controlled using 3-position 4-way eletropneumatic servo valve Flow valve valve port opening, realizes the quick accurate control of gas flow, and high-pressure gas flow amount control device of the invention responds speed Degree is fast, control precision is high.

To achieve the above object, the present invention provides a kind of high-pressure gas flow amount control devices comprising flow valve, guide Servo valve and displacement sensor, wherein

The flow valve includes valve body, valve seat, valve pocket, spool, valve pocket end cap, lower cover, spring fairlead and resets bullet Spring, the valve body are the cylindrical body with axially extending bore, and axially extending bore is multistage stepped hole, and the valve body lower end face is fixed with Lower cover, institute's displacement sensors are fixed on lower cover and the elongation bar of institute's displacement sensors protrudes into flow valve, described Spring, spring fairlead, valve pocket end cap, valve pocket, spool and valve seat are sequentially installed in the axially extending bore of valve body from bottom to top,

The valve seat be the rotary body with axial central through hole, the axial central through hole be cone, with spool The tapered surface that upper surface has forms sealing cooperation,

The spool is arranged in valve body axially extending bore, and the spool outer wall is sheathed with valve pocket, and the valve pocket is tubular, Center has the stair-stepping axially extending bore of second order, and the stair-stepping axially extending bore of the second order is followed successively by interconnected upper from top to bottom Hole and lower opening, the spool outer wall have annular convex platform, which is located in the lower opening of valve pocket, and spool top is from valve pocket Upper hole is pierced by, and is formed and sealed with the upper hole inner wall of valve pocket, and the cavity of lower opening is divided into positioned at ring by the annular convex platform of the spool Control chamber a above the shape boss and control chamber b below annular convex platform, intersegmental part has and spool hole wall under the spool Integral connecting plate, the connecting plate center have central through hole, which is used for the elongation bar for displacement sensor It is pierced by, there are multiple balance holes around the central through hole on the connecting plate, the balance hole is for making connecting plate two sides Gas pressure balancing,

Spring fairlead is fixed on the connecting plate, the reset spring snare at the spring fairlead outer wall, Described reset spring one end abuts the lower cover and the other end abuts the connecting plate,

Valve pocket end cap is arranged between the lower end surface of the valve pocket and the upper surface of the lower cover,

The first duct, the second duct and third duct, the second hole link institute are provided on the valve body wall surface Control chamber a is stated, control chamber b described in the third hole link, the entrance of valve body described in the first hole link,

Guide's servo valve include 3-position 4-way eletropneumatic servo valve, the first electromagnetic switch valve, the second electromagnetic switch valve and Valve block is connected, there are A mouthfuls, P mouthfuls, B mouthfuls and T mouthfuls on the 3-position 4-way eletropneumatic servo valve, the 3-position 4-way electric-gas is watched Take the A mouth on valve, P mouthfuls, B mouthfuls be connected to the second duct on the valve body, the first electromagnetism by connecting valve block internal gutter respectively The outlet of switch valve, the second electromagnetic switch valve entrance, the T mouth of the 3-position 4-way eletropneumatic servo valve is connected to atmosphere,

The entrance of first electromagnetic switch valve is connected to the first duct on the valve body by connecting valve block internal gutter, The entrance of first electromagnetic switch valve passes through the third duct and second that connection valve block internal restriction hole is connected on the valve body simultaneously The outlet of electromagnetic switch valve.

Further, the axially extending bore that the valve body has is six rank stepped holes comprising is sequentially coaxially connected from top to bottom Logical single order hole, second order hole, three rank holes, quadravalence hole, five rank holes, six rank holes, wherein

Six rank hole is equal and maximum with quadravalence hole aperture, five rank hole it is equal with three rank hole aperture and Aperture time is big, and single order hole aperture is minimum, and second order hole aperture is described between the single order hole and five rank hole Valve body upper surface is arranged in using the outlet as flow valve in single order hole, and six rank hole is arranged in valve body lower end face, the valve body Side has an entrance, its perforation orthogonal with the quadravalence hole of the entrance, and the first hole link quadravalence hole on the valve body is described Six rank holes described in second duct and third hole link on valve body.

Further, there are annulus outstanding, the single order hole of the annulus outside wall surface and the valve body in the valve seat upper surface Location fit, the valve seat wall have side annular seal grooves, and the side annular seal grooves are for being embedded in the sealing of O shape Circle, to form sealing cooperation with valve body second order hole.

Further, the valve pocket includes upper shell and lower shell, the outer diameter of the upper shell and lower shell respectively with institute State five rank holes of valve body, six rank hole apertures match,

The upper shell and lower shell junction form ladder position, with the 5th rank hole on valve body and the 6th rank hole institute shape At ladder position cooperation,

The lower shell outer wall has twice annular convex platform, has upper annular seal groove on first of annular convex platform, and second There is lower annular seal groove, it is close that lower annular seal groove described in the upper annular seal groove is used to embedded O shape on road annular convex platform Seal is cooperated with sealing with six rank holes of valve body.

Further, the valve pocket end cap is located in six rank hole, and the valve pocket end cap is the rotation with axially extending bore Swivel, axially extending bore hole wall have inner hole annular groove, the inner hole annular groove for being embedded in O-ring seals, with valve Outer core forms sealing cooperation, and the valve pocket end cap outer wall has annular groove, and annular groove is used to be embedded in O-ring seals, with Sealing cooperation is formed with valve interior wall, the valve pocket end cover has the bottom surface annular groove around itself axially extending bore, should Bottom surface annular groove is for being embedded in O-ring seals, to cooperatively form axial seal with lower cover.

Further, the lower cover is the rotary body with axial central through hole, the upper end mask there are two annular groove, Respectively spring guide groove and buffering spacer groove, the spring guide groove and the cushion film trap are respectively intended to keep resetting bullet Spring position and placement buffering spacer, the lower cover lower end surface have the displacement sensor annular around itself axial central through hole Seal groove, displacement sensor annular seal groove are used for embedding shape O-ring seals, to form sealing cooperation with displacement sensor.

Further, the 3-position 4-way eletropneumatic servo valve is the side valve type single stage servo valve that voice coil motor directly drives.

In general, through the invention it is contemplated above technical scheme is compared with the prior art, can obtain down and show Beneficial effect:

In the present invention, the high pressure gas that flow valve inlet is passed through enters guide's servo valve by the runner on valve body, in the ban When leading the 3-position 4-way eletropneumatic servo valve forward direction aperture of servo valve, high pressure gas enters a control chamber, while in b control chamber Gas is discharged to atmosphere by 3-position 4-way eletropneumatic servo valve, and spool moves downward, and spool is separated with valve seat, and flow valve is opened, stream The displacement sensor real-time monitoring spool position on valve, feedback to extraneous controller are measured, dynamic adjusts 3-position 4-way electric-gas and watches The aperture of valve is taken, can realize the accurate regulatory function of flow with accurate flow control valve core position.When 3-position 4-way electricity-gas When servo valve negative sense aperture, high pressure gas enters b control chamber, while the gas in a control chamber passes through 3-position 4-way electric-gas servo Valve is discharged to atmosphere, and spool moves upwards, and spool is pressed on valve seat, and flow valve is closed.

In the present invention, both ends stress balance after there is flow valve core central through hole, spool to open overcomes cut-off type valve Door force unbalance phenomenon effectively improves response speed and control precision, and flow valve of the invention has double-acting cylinder structure, And there is cutoff function, spring pre-pressing can be relied on, can ensure that will not reveal in hyperbaric environment down-off valve.

In the present invention, flow valve valve port opening is controlled using 3-position 4-way eletropneumatic servo valve, realizes the quick of gas flow Accurate control.3-position 4-way eletropneumatic servo valve is directly driven by voice coil motor, solves existing nozzle flapper type servo valve volume Constant-pressure is low, structure is complicated, the easily contaminated blocking of nozzle, pilot control part exhaust noise are big and compressed air consumption is big Problem, while solving the problems, such as that the existing stagnant ring of high-pressure pneumatic proportioning valve is big, frequency response is low.

Detailed description of the invention

Fig. 1 is big orifice high-pressure gas flow amount control device overall structure diagram in the embodiment of the present invention；

Fig. 2 is big orifice high-pressure gas flow amount control device valve body structure schematic diagram in the embodiment of the present invention；

Fig. 3 is big orifice high-pressure gas flow amount control device valve seat construction schematic diagram in the embodiment of the present invention；

Fig. 4 is big orifice high-pressure gas flow amount control device housing configuration schematic diagram in the embodiment of the present invention；

Fig. 5 is big orifice high-pressure gas flow amount control device valve core structure schematic diagram in the embodiment of the present invention；

Fig. 6 is big orifice high-pressure gas flow amount control device valve pocket end cover structure schematic diagram in the embodiment of the present invention；

Fig. 7 is big orifice high-pressure gas flow amount control device lower cover structural schematic diagram in the embodiment of the present invention；

Fig. 8 is big orifice high-pressure gas flow amount control device guide's servo valve schematic illustration in the embodiment of the present invention.

Specific embodiment

In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below Not constituting a conflict with each other can be combined with each other.

Fig. 1 is big orifice high-pressure gas flow amount control device overall structure diagram in the embodiment of the present invention, such as Fig. 1 institute Show, big orifice high-pressure gas flow amount control device of the present invention includes flow valve and guide's servo valve, and the flow valve cuts for gas control Only formula flow control valve, including valve body 110, valve seat 120, valve pocket 130, spool 140, valve pocket end cap 150, lower cover 160, bullet Spring guide sleeve 170 and reset spring 171.

Fig. 2 is big orifice high-pressure gas flow amount control device valve body structure schematic diagram in the embodiment of the present invention, such as Fig. 2 institute Show, the valve body 110 is the cylindrical body with axially extending bore, and axially extending bore is six rank stepped holes, including from top to bottom successively Single order hole 111, second order hole 112, three rank holes 113, quadravalence hole 114, five rank holes 115, the six rank holes 116 of coaxial communication, wherein six Rank hole 116 is equal and maximum with 114 aperture of quadravalence hole, and five rank holes 115 are equal with three rank holes, 113 aperture to take second place, 112 hole of second order hole Third, 111 aperture of single order hole is minimum for diameter, and single order hole 111 is connected to 110 upper surface of valve body, is the outlet of flow valve, six rank holes 116 connection 110 lower end surfaces of valve body；110 side of valve body has air inlet, perforation orthogonal with the quadravalence hole 114.It is described The first duct 118A in connection quadravalence hole 114 and 110 surface of valve body is provided on valve body 110.Also there is connection on valve body 110 The second duct 118B and third duct 118C on 110 surface of six rank holes 116 and valve body.In the axially extending bore of the valve body 110 certainly It is lower and on be sequentially arranged with spring 171, spring fairlead 170, valve pocket end cap 150, spool 140, displacement sensor magnet ring 310, Valve pocket 130, valve seat 120.

Fig. 3 is big orifice high-pressure gas flow amount control device valve seat construction schematic diagram in the embodiment of the present invention, such as Fig. 3 institute Show, the valve seat 120 be the rotary body with axial central through hole, the axial central through hole 121 be cone, with spool Realize sealing cooperation in 140 upper surfaces.There are annulus 122 outstanding, 122 outside wall surface of annulus and the one of valve body 110 in 120 upper surface of valve seat 111 location fit of rank hole.120 side wall of valve seat have annular seal grooves 123, in be embedded with O-ring seals, with valve body The sealing cooperation of 110 second order holes 112.

Fig. 4 is big orifice high-pressure gas flow amount control device housing configuration schematic diagram in the embodiment of the present invention, such as Fig. 4 institute Show, the valve pocket 130 is the rotary body with axially extending bore 131, by the upper shell 131A and lower shell 131B structure being linked together At, the outer diameter of upper shell 131A and lower shell 131B respectively with five rank holes 115 of the valve body 110, six rank holes, 116 aperture phase Match, upper shell 131A and the junction lower shell 131B form ladder position, the 5th rank hole 115 on the ladder position and valve body 110 The cooperation of ladder position is formed by with the 6th rank hole 116.

In more detail, there is twice annular convex platform, wherein on first of annular convex platform in the lower shell 131B outside wall surface Equipped with upper annular seal groove 134B, there is lower annular seal groove 134C on second annular convex platform, upper and lower annular seal groove is used In embedded O-ring seals, cooperated with being sealed with six rank holes 116 of valve body 110.The axially extending bore of the valve pocket 130 is second order rank Terraced hole is followed successively by upper hole 132 and the lower opening 133 of coaxial communication from top to bottom, and 133 apertures of upper 132 aperture ratio lower opening of hole are small, In, the aperture in the upper hole 132 matches with 140 outer diameter of spool, there is annular groove 134A on upper 132 hole wall of hole, For embedding Glais ring, cooperated with being sealed with spool 140；The annular convex platform outer diameter phase in the aperture of lower opening 133 and 140 outer wall of spool Matching；There are four variable cross-section through-holes 135 for the upper shell 131A wall surface tool, and four variable cross-section through-holes 135 are around upper shell 131A axis Line mutually symmetrical ring in 90 ° around.

There is a circle circumferentially equally distributed upper stomata 136A between the twice annular convex platform of the lower shell 131B, under There is a circle circumferentially equally distributed air holes 136B, upper stomata 136A and air holes 136B on the lower end surface of cylinder 131B It is connected to respectively with the lower opening 133.

Fig. 5 is big orifice high-pressure gas flow amount control device valve core structure schematic diagram in the embodiment of the present invention, such as Fig. 5 institute Show, the spool 140 is tubular rotary body, and end face is circular conical surface 141 thereon, with the axial centre conical through-hole with valve seat 120 121 realize sealing cooperation.140 inner wall of spool, which has, reinforces rib shape ring structure 142, and such structure design can have While compared with high withstand voltage intensity, utmostly mitigate spool weight.140 outer wall of spool has annular convex platform, opens on annular convex platform There is sealed groove 143, for embedding Glais ring, to be slidingly sealed with 130 inner wall of valve pocket.140 inner hole lower part of spool has and hole The integral connecting plate 144 of wall, 144 center of connecting plate have central through hole 146, for extending for displacement sensor main body 300 Bar is pierced by, and has multiple balance holes 147 around the central through hole 146 on connecting plate 144, balance hole 147 is for making connecting plate The gas pressure balancing of 144 two sides spool inner holes.Also there are multiple screw holes around the central through hole 146 on connecting plate 144 145, magnet ring 310 and spring fairlead 170 for fixed displacement sensor.Spring fairlead 170 is that top end face has through-hole Cylinder, top end face connect by screw with 144 lower end surface of connecting plate.

When flow valve is opened, high pressure gas makes 144 two sides of connecting plate by a balance hole 147 of spool connecting plate more than 144 The gas pressure balancing of spool inner hole, so that 140 driving force of spool is reduced, so as to improve response speed.

The spool 140 is mounted in valve pocket 130, and the annular convex platform of spool 140 is located in the lower opening 133 of valve pocket 130, 140 top of spool is pierced by from the upper hole 132 of valve pocket 130, and is formed and sealed with the Glais ring in hole 132 on valve pocket 130.Spool The cavity of lower opening 133 is divided into two by the annular convex platform of 140 outer walls, and for annular convex platform the above are a control chamber, a control chamber passes through the Two duct 118B are connect with guide's servo valve, and the following are b control chamber, b control chambers to pass through third duct 118C and elder generation for annular convex platform Lead servo valve connection.

Fig. 6 is big orifice high-pressure gas flow amount control device valve pocket end cover structure schematic diagram in the embodiment of the present invention, such as Fig. 6 Shown, the valve pocket end cap 150 is located in six rank holes 116, and valve pocket end cap 150 is the rotary body with axially extending bore, axial direction Through hole wall has inner hole annular groove 151, and hole annular groove 151 is close to be formed with spool 140 for embedding O-ring seals Envelope.150 outer wall of valve pocket end cap has outer wall annular groove 152, outer wall annular groove 152 for embedding O-ring seals, with valve 110 inner wall of body forms sealing, and 150 bottom surface of valve pocket end cap has the bottom surface annular groove 153 around axially extending bore, and bottom surface annular is recessed Slot 153 is for embedding O-ring seals, to cooperatively form axial seal with lower cover 160.

Fig. 7 is big orifice high-pressure gas flow amount control device lower cover structural schematic diagram in the embodiment of the present invention, can by Fig. 7 Know, the lower cover 160 is the rotary body with axial central through hole, and the upper end mask is there are two annular groove, from center to outer Wall surface is disposed with spring guide groove 161 and buffering spacer groove 162, and spring guide groove 161 and buffering spacer groove 162 are used respectively In keeping 171 position of reset spring and placement buffering spacer 162A, the lower end surface of lower cover 160 has in the axial direction The displacement sensor annular seal groove 163 of heart through-hole, displacement sensor annular seal groove 163 is for embedded installation O shape sealing Circle is cooperated with sealing with displacement sensor main body 300, and the lower end surface of lower cover 160 is also circumferentially evenly distributed with circular through hole 164, it is fastened for being formed by bolt 165 and valve body 110.

In the present invention, displacement sensor includes sensor main body 300 and magnet ring 310.When assembly, magnet ring 310 passes through screw It being connected on the connecting plate 144 of spool 140, sensor main body 300 is connected to the lower end surface of lower cover 160 by screw 301, Round bar sequentially pass through the axial central through hole of lower cover 160, spring fairlead 170, spool connecting plate central through hole 146 and magnetic Ring 310.

When assembly, the valve seat 120 is formed with the second order hole 112 of O-ring seals and valve body 110 and is sealed, valve pocket 130 it is upper The end face cylinder 131A and 120 lower end face contact of valve seat simultaneously compress, and 140 upper section of spool passes through the upper shell 131A of valve pocket 130, valve The annular convex platform of core 140 passes through the lower shell 131B of valve pocket 130, and 171 one end of reset spring is connected to 140 inner hole lower part of spool 144 lower end surface of connecting plate, and constrained by spring fairlead 170, the spring guide groove 161 on another end in contact lower cover 160, valve Six rank holes 116 of the major diameter fit of end cap 150 inside valve body 110 are covered, internal diameter is matched with 140 lower section of spool, and lower cover 160 is logical It crosses bolt 165 and is fixed on 110 lower end surface of valve body, while compressing valve pocket end cap 150, and compress valve pocket 130 in turn.

Fig. 8 is big orifice high-pressure gas flow amount control device guide's servo valve schematic illustration in the embodiment of the present invention, such as Shown in Fig. 8, guide's servo valve includes that 3-position 4-way eletropneumatic servo valve 210, the first electromagnetic switch valve 220, the second electromagnetism are opened Close valve 230 and connection valve block 240, guide's servo valve for realizing guide's gas circuit circulation and shutdown.

Wherein, the A mouth of the 3-position 4-way eletropneumatic servo valve 210, P mouthfuls, B mouthfuls respectively by connection 240 internal holes of valve block Road is connected to the outlet of the second duct 118B, the first electromagnetic switch valve 220 on the valve body 110, the second electromagnetic switch valve 230 The T mouth of entrance, 3-position 4-way eletropneumatic servo valve 210 is connected to atmosphere.The entrance of first electromagnetic switch valve 220 passes through connection valve block 240 internal gutters are connected to the first duct 118A on the valve body 110, while passing through connection 240 internal restriction hole 240A of valve block The outlet of the third duct 118C and the second electromagnetic switch valve 230 that are connected on the valve body 110.

In the present invention, the 3-position 4-way eletropneumatic servo valve 210 is that the side valve type single-stage that voice coil motor directly drives is watched Take valve.

In the present invention, 3-position 4-way eletropneumatic servo valve can be examined by respective displacement sensor respectively with flow valve spool position Ambient controller is surveyed and fed back to, closed loop location control system is integrally formed, realizes the high-precision of flow valve, height responds, complete It automatically controls.

Working principle of the present invention are as follows:

The working principle of the invention is: the high pressure gas of flow valve inlet enters guide's servo by the runner on valve body Valve, when the 3-position 4-way eletropneumatic servo valve forward direction aperture of guide's servo valve, high pressure gas enters a control chamber, while b is controlled Intracavitary gas is discharged to atmosphere by 3-position 4-way eletropneumatic servo valve, and spool moves downward, and spool is separated with valve seat, flow valve It opens, the displacement sensor real-time monitoring spool position on flow valve, feedback arrives controller, and dynamic adjusts 3-position 4-way electric-gas The aperture of servo valve, while the spool position of 3-position 4-way eletropneumatic servo valve is fed back by extraneous displacement sensor real-time monitoring, Double-closed-loop control is formed, flow valve spool position is accurately controlled, realizes the accurate regulatory function of flow.When 3-position 4-way electricity- When gas servo valve negative sense aperture, high pressure gas enters b control chamber, while the gas in a control chamber is watched by 3-position 4-way electric-gas It takes valve and is discharged to atmosphere, spool moves upwards, and spool is pressed on valve seat, and flow valve is closed.

The present invention is made of guide's servo valve and flow valve, and high pressure gas a part that flow valve inlet is passed through enters guide Servo valve realizes the SERVO CONTROL of flow valve spool displacement, and another part flows through flow valve valve port and enters load cavity, realizes controlled System pressure, load situation or speed control.Flow valve, which is in close state, can end gas source, and flow valve is in running order When, by servo valve control drive of high-pressure gas flow valve core；Flow valve spool position is detected and is fed back to by displacement sensor Ambient controller is integrally formed big orifice high-pressure gas flow amount control device spool position under the control action of guide's servo valve Closed-loop control.Big orifice high-pressure gas flow amount control device of the invention has good seal performance, operating pressure height, range of flow Greatly, the feature that control precision is high, response is fast, suitable for high-precision, the Large-scale High-Pressure atmospheric control of quick response.

In the present invention, there are A mouthfuls, P mouthfuls, B mouthfuls and T mouthfuls on the 3-position 4-way eletropneumatic servo valve 210, wherein A mouthfuls, P mouthfuls, B mouthfuls and T mouthfuls are common representation method of the those skilled in the art to 3-position 4-way valve port.

As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include Within protection scope of the present invention.

Claims (7)

1. A high-pressure gas flow control device, comprising a pilot servo valve and a displacement sensor, characterized in that, also comprising a flow valve, wherein, The flow valve comprises a valve body (110), a valve seat (120), a valve sleeve (130), a valve core (140), a valve sleeve end cover (150), a lower end cover (160), a spring guide sleeve (170) and return spring (171), The valve body (110) is a cylindrical body with an axial through hole, the axial through hole is a multi-step stepped hole, a lower end cover (160) is fixed on the lower end surface of the valve body (110), and the displacement sensor It is fixed on the lower end cover (160) and the extension rod of the displacement sensor extends into the flow valve, A spring (171), a spring guide sleeve (170), a valve sleeve end cover (150), a valve sleeve (130) and a valve core (140) are installed in the axial through hole of the valve body (110) in order from bottom to top. ) and valve seat (120), The valve seat (120) is a rotating body with an axial central through hole (121), and the axial central through hole (121) is conical and is formed with the conical surface of the upper end surface of the valve core (140) seal fit, The valve core (140) is arranged in the axial through hole of the valve body (110), the outer wall of the valve core (140) is covered with a valve sleeve (130), the valve sleeve (130) is cylindrical, and the center of the valve sleeve (130) is cylindrical. There is a second-stage stepped axial through hole, and the second-stage stepped axial through hole is sequentially connected to an upper hole (132) and a lower hole (133) from top to bottom, The outer wall of the valve core (140) has an annular boss, the annular boss is located in the lower hole (133) of the valve sleeve (130), and the upper part of the valve core (140) passes through the upper hole (132) of the valve sleeve (130). out, and form a seal with the inner wall of the upper hole (132) of the valve sleeve (130), The annular boss of the valve core (140) divides the cavity of the lower hole (133) into a control cavity a located above the annular boss and a control cavity b located below the annular boss, Inside the lower section of the valve core (140), there is a connecting plate (144) integral with the hole wall of the valve core (140), the connecting plate (144) has a central through hole (146) in the center, and the central through hole (146) is used for For the extension rod of the displacement sensor to pass through, the connecting plate (144) is provided with a plurality of balance holes (147) around the central through hole (146), and the balance holes (147) are used to make the connecting plate (144) ) gas pressure balance on both sides, A spring guide sleeve (170) is fixed on the connecting plate (144), the return spring (171) is wrapped around the outer wall of the spring guide sleeve (170), and one end of the return spring (171) abuts against the lower end the cover (160) and the other end abutting the connecting plate (144), The valve sleeve end cover (150) is arranged between the lower end surface of the valve sleeve (130) and the upper end surface of the lower end cover (160), A first hole (118A), a second hole (118B) and a third hole (118C) are arranged on the wall of the valve body (110), and the second hole (118B) communicates with the control cavity (a), so The third orifice (118C) communicates with the control chamber (b), and the first orifice (118A) communicates with the inlet of the valve body (110), The pilot servo valve comprises a three-position four-way electro-pneumatic servo valve (210), a first electromagnetic switch valve (220), a second electromagnetic switch valve (230) and a connecting valve block (240), The three-position four-way electro-pneumatic servo valve (210) has A port, P port, B port and T port, and the A port, P port and B port on the three-position four-way electro-pneumatic servo valve (210) The second orifice (118B) on the valve body (110), the outlet of the first electromagnetic on-off valve (220), and the inlet of the second electromagnetic on-off valve (230) are respectively communicated with the internal orifice of the connecting valve block (240), so as to The T port of the three-position four-way electro-pneumatic servo valve (210) is connected to the atmosphere, The inlet of the first electromagnetic on-off valve (220) communicates with the first orifice (118A) on the valve body (110) through the internal orifice of the connecting valve block (240), and the inlet of the first electromagnetic on-off valve (220) simultaneously passes through The internal orifice (240A) of the connecting valve block (240) communicates with the third orifice (118C) on the valve body (110) and the outlet of the second electromagnetic switch valve (230). 2 . The high-pressure gas flow control device according to claim 1 , wherein the axial through hole of the valve body ( 110 ) is a six-step stepped hole, which includes coaxial communication from top to bottom in sequence. 3 . The first-order holes (111), second-order holes (112), third-order holes (113), fourth-order holes (114), fifth-order holes (115), and sixth-order holes (116) of the The sixth-order holes (116) and the fourth-order holes (114) have the same and largest diameters, the fifth-order holes (115) and the third-order holes (113) have the same diameter and the second largest diameter, and the first-order holes (115) and the third-order holes (113) have the same diameter. The hole (111) has the smallest diameter, and the second-order hole (112) has a diameter between the first-order hole (111) and the fifth-order hole (115). The first-order hole (111) is arranged on the upper end face of the valve body (110) to serve as the outlet of the flow valve, and the sixth-order hole (116) is arranged on the lower end face of the valve body (110), The side of the valve body (110) has an inlet, and the inlet is orthogonally penetrated with the fourth-order hole (114), The first hole (118A) on the valve body (110) communicates with the fourth-order hole (114), and the second hole (118B) and the third hole (118C) on the valve body (110) communicate with the sixth-order hole (116). 3. A high-pressure gas flow control device according to claim 2, characterized in that, a protruding ring (122) is provided on the upper end surface of the valve seat (120), and the outer wall surface of the ring (122) is connected to the outer wall of the valve seat (120). The first-order hole (111) of the valve body (110) is positioned and matched, and the side wall of the valve seat (120) has a side annular sealing groove (123), and the side annular sealing groove (123) is used for embedding O-shaped The sealing ring is used to form a sealing fit with the second-order hole (112) of the valve body (110). 4. The high-pressure gas flow control device according to claim 3, wherein the valve sleeve (130) comprises an upper cylinder (131A) and a lower cylinder (131B), and the upper cylinder (131A) ) and the outer diameters of the lower cylinder (131B) respectively match the apertures of the fifth-order hole (115) and the sixth-order hole (116) of the valve body (110), A step portion is formed at the joint of the upper cylinder body (131A) and the lower cylinder body (131B), so as to cooperate with the step portion formed by the fifth step hole (115) and the sixth step hole (116) on the valve body (110). , The outer wall of the lower cylinder body (131B) has two annular bosses, the first annular boss has an upper annular sealing groove (134A), and the second annular boss has a lower annular sealing groove (134B). The upper annular sealing groove (134A) and the lower annular sealing groove (134B) are both used for inserting an O-ring sealing ring, so as to fit tightly with the sixth-order hole (116) of the valve body (110). 5. The high-pressure gas flow control device according to claim 4, wherein the valve sleeve end cover (150) is located in the sixth-order hole (116), and the valve sleeve end cover (150) It is a rotating body with an axial through hole, and the wall of the axial through hole has an inner hole annular groove (151), and the inner hole annular groove (151) is used for inserting an O-ring sealing ring to be connected with the valve core. (140) The outer wall forms a sealing fit, the outer wall of the valve sleeve end cover (150) has an annular groove (152), and the annular groove (152) is used for embedding an O-ring seal to form with the inner wall of the valve body (110) In sealing fit, the bottom surface of the valve sleeve end cover (150) has a bottom surface annular groove (153) surrounding its axial through hole, and the bottom surface annular groove (153) is used for inserting an O-ring sealing ring to connect with the lower end cover. (160) cooperate to form an axial seal. 6 . The high-pressure gas flow control device according to claim 5 , wherein the lower end cover ( 160 ) is a rotating body with an axial center through hole, and its upper end surface has two annular grooves, which are respectively 6 . A spring guide groove (161) and a buffer washer groove (162), the spring guide groove (161) and the buffer washer groove (162) are respectively used to maintain the position of the return spring (171) and place the buffer washer (162A) ), the lower end surface of the lower end cover (160) has a displacement sensor annular sealing groove (163) surrounding its axial center through hole, and the displacement sensor annular sealing groove (163) is used for an embedded O-ring seal to be compatible with the displacement sensor Form a tight fit. 7 . The high-pressure gas flow control device according to claim 6 , wherein the three-position four-way electro-pneumatic servo valve ( 210 ) is a spool type single-stage servo valve directly driven by a voice coil motor. 8 .