CN101922580B - Differential pressure valve capable of automatically adjusting environments - Google Patents

Abstract

The invention relates to a differential pressure valve capable of automatically adjusting environments, which comprises an upper valve body, a middle valve body and a lower valve body, wherein an upper diaphragm is arranged between the upper valve body and the middle valve body in a sealing mode, and a lower diaphragm is arranged between the middle valve body and the lower valve body in a sealing mode; the upper part of the middle valve body is provided with an overflow gate; the middle valve body is internally provided with a hollow vertically-installed bi-diaphragm connecting rod; and an output pressure feedback port is arranged on the lower valve body. The differential pressure valve operates in a closed environment, can automatically adjust output pressure along with the pressure variation of a use environment (ventilation environment), enables the pre-adjusted effective working pressure value to be unchanged, and is mainly used in pneumatic machineries (air cylinders, air motors and the like) operating in closed environments.

Description

A kind of automatic adjustment environment defferential valve

Technical field

The present invention relates to a kind of defferential valve, be specifically related to a kind of automatic adjustment environment defferential valve.

Background technique

With the pressurized gas is power source; Work in the air pressure driving device (or working in the pneumatic machinery of the outside exhaust of different depth need under water) in the enclosed environment; For overcoming ever-increasing exhaust pressure, need to use very high incoming pressure usually, so not only energy consumption increases; Exhaust pressure in the enclosed environment also can rise rapidly, makes the working condition fluctuation big.At present, also do not design on the market and can adjust delivery pressure simultaneously automatically, make the constant pneumatic regulator of effective working pressure size with Environmental Conditions (exhaust environment) variation in pressure.

Summary of the invention

The present invention has overcome the deficiency of existing technology, has proposed a kind of automatic adjustment environment defferential valve, and this defferential valve can be adjusted delivery pressure automatically, makes effective working pressure size of preset remain unchanged stable working and energy-conservation.

Technological scheme of the present invention is: a kind of automatic adjustment environment defferential valve, comprise upper valve body, middle valve body and following valve body, and sealing is provided with upper diaphragm between said upper valve body and the middle valve body, and sealing is provided with down diaphragm between said middle valve body and the following valve body;

The top of valve body is provided with a flow-off in said, and the set inside of valve body has vertically arranged pair of diaphragm coupling rod of a hollow in said, and said valve body down is provided with the delivery pressure feedback port;

Said defferential valve works in the enclosed environment.

Said upper valve body is provided with an exhaust environment pressure introduction port, and said upper valve body and upper diaphragm constitute an airtight discharge plenum.

Valve body and upper diaphragm constitute an airtight spill cavity in said, and said flow-off is positioned at spill cavity.

Valve body constitutes airtight effective working pressure chamber with following diaphragm in said, and the bottom of valve body is provided with effective working pressure inlet opening in said, and said effective working pressure inlet opening is positioned at effective working pressure chamber.

Said valve body down constitutes an airtight pressure feedback chamber with following diaphragm; In the pressure feedback chamber; Be provided with a vertically arranged valve rod in the valve body under said; The top of said valve rod is adjacent with the afterbody of two diaphragm coupling rods, under the pressure balance in the pressure feedback chamber, is in air-tight state between valve rod and the two diaphragm coupling rod.

Said valve body down is provided with a source of the gas inlet opening and a delivery pressure mouth; Be provided with vertically arranged spool at the said middle part of valve body down; The top of said spool is connected with the bottom of said valve rod; Be provided with a Returnning spring between the bottom of the bottom of said spool and said valve body down, be provided with seal spool between the side walls of spool and following valve body.

Said pair of diaphragm coupling rod is fixed between upper diaphragm and the following diaphragm through mounting kit.

Be provided with valve stem seal between the upper inside wall of said valve rod and following valve body.

Because adopted upper diaphragm and following diaphragm, the delivery pressure of said delivery pressure mouth is with the change in pressure in the discharge plenum, but the pressure size in effective working pressure chamber of preset remains unchanged.

When spool reached state of equilibrium, the variation of the incoming pressure of source of the gas inlet opening did not have influence to the delivery pressure of delivery pressure mouth.

The present invention has following beneficial effect:

1) owing to adopted upper diaphragm and following diaphragm, the delivery pressure of said delivery pressure mouth is with the change in pressure in the discharge plenum, but the pressure size in effective working pressure chamber of preset remains unchanged.

2) when spool reaches state of equilibrium, the variation of the incoming pressure of source of the gas inlet opening does not have influence to the delivery pressure of delivery pressure mouth.

3) the invention solves with the pressurized gas is power source, works in the pneumatic machinery in the enclosed environment, because the increase of exhaust environment pressure, the contradiction that useful effect power reduces can increase with exhaust resistance, adjusts delivery pressure automatically, to guarantee useful effect power.

Description of drawings

Further specify the present invention below in conjunction with accompanying drawing and embodiment.

Fig. 1 is a cross section structure schematic representation of the present invention.

Fig. 2 is a defferential valve functional symbol schematic representation of the present invention.

Fig. 3 is that upper diaphragm of the present invention is analyzed schematic representation with following diaphragm applied force.

Fig. 4 is a spool force analysis schematic representation of the present invention.

Among the figure, 1. descend valve body; 2. middle valve body; 3. upper valve body; 4. upper diaphragm; 5. two diaphragm coupling rods; 6. two diaphragm coupling rod sealings; 7. descend diaphragm; 8. valve stem seal; 9. Returnning spring; 10. seal spool; 11. spool; 12. effective pressure pressure regulator valve; 13. valve rod; 14. pressure feedback chamber; 15. effective working pressure chamber; 16. spill cavity; 17. discharge plenum; A representes the source of the gas inlet opening; B representes effective working pressure inlet opening; C representes the exhaust environment pressure introduction port; D representes the delivery pressure mouth; E representes the delivery pressure feedback port; F representes flow-off; P _sExpression source of the gas working pressure; P _wRepresent effective working pressure; P _nExpression exhaust environment pressure; P ₁The expression delivery pressure; D ₁Expression upper diaphragm diameter; A ₁Expression upper diaphragm active area; Expression is the iris action area down; The two diaphragm coupling rods of d ' expression footpath, F _cExpression Returnning spring power, F _F1The surface friction drag of the two diaphragm coupling rod sealings of expression, F _M1The downward active force in expression valve rod top,

The active force that the two diaphragm coupling rods of expression bottom makes progress.

Embodiment

Further specify below in conjunction with accompanying drawing, and unrestricted scope involved in the present invention.

Referring to shown in Figure 1, the present invention includes upper valve body 3, middle valve body 2 and following valve body 1, main valve control mouth comprises that effective working pressure inlet opening b, its effective working pressure of setting up in advance are P _w, with the exhaust environment pressure introduction port c that exhaust environment pressure changes, its exhaust environment pressure is P _n, source of the gas inlet opening a, its source of the gas working pressure is P _s, delivery pressure mouth d, its delivery pressure are P ₁And five mouths such as flow-off f.Exhaust environment pressure introduction port c is arranged on the top of upper valve body 3, and source of the gas inlet opening a is arranged on down on the valve body 1.Source of the gas (P _s) divide two-way: the one tunnel imports main valve, source of the gas inlet opening a, the one road to effective pressure pressure regulator valve 12, and the output P of effective pressure pressure regulator valve 12 _w(its big I is according to its size of need of work preset) is to effective working pressure inlet opening b.Air pressure P in the pneumatic machinery degassing container _nTo exhaust environment pressure introduction port c.

Under reset condition, this moment is working pressure P effectively _wWith the exhaust environment pressure P _nBe zero gauge pressure, source of the gas inlet opening a closes under the effect of Returnning spring 9, delivery pressure mouth d no-output.If after 12 pressure regulation of effective pressure pressure regulator valve, its effective working pressure P _wExistence also becomes big, and effectively the pressure in working pressure chamber 15 increases, effective working pressure P _wCompressing is diaphragm 7 down; The lower ends downward motion of the fork font of the two diaphragm coupling rods 5 of following diaphragm 7 compressings; Because two diaphragm coupling rods 5 and valve rod 13 airtight adjacency move downward valve rod 13, downward active force compression reseting spring 9 promotes spool 11 air intake valve is opened.Be provided with seal spool 10 between the lower inner wall of said spool 11 and following valve body 1; Be provided with valve stem seal 8 between the upper inside wall of said valve rod 13 and following valve body 1.Two diaphragm coupling rods 5 are sealed with middle valve body 2 through mounting kit and two diaphragm coupling rod sealings 6, and can do relative movement with middle valve body 2.

In like manner, if there is pressure P in exhaust chamber _nThe time; Pressure in the discharge plenum 17 raises, and the two diaphragm coupling rods 5 of upper diaphragm 4 compressings move downward, and through following diaphragm 7 valve rod 13 are moved downward; Downward active force compression reseting spring 9 promotes spool 11 air intake valve is opened; Thereby increase the main valve openings of sizes, after air intake valve was opened, there was delivery pressure P in delivery pressure mouth d ₁, simultaneously, delivery pressure P ₁On following diaphragm 7 and upper diaphragm 4, produce upwards thrust and its balance through delivery pressure feedback port e feedback effect.When main valve plug is in balance, can try to achieve delivery pressure P ₁With effective working pressure P _w, the exhaust environment pressure P _nAnd upper diaphragm active area A ₁, Returnning spring 9 Returnning spring power F _cAnd relation is between the frictional force:

${\mathrm{<figure-callout\; id="1"\; label="P"\; filenames="HSA00000211263600011.png"\; state="\{\{state\}\}">P</figure-callout>}}_1=(p_w+p_n)-\frac{F_c-({\mathrm{<figure-callout\; id="1"\; label="F\; f"\; filenames="HSA00000211263600011.png"\; state="\{\{state\}\}">F</figure-callout>}}_f+{\mathrm{<figure-callout\; id="2"\; label="F\; f"\; filenames="HSA00000211263600011.png"\; state="\{\{state\}\}">F</figure-callout>}}_f+F_{f3})}{A_1}$

Wherein, F _F1Be the surface friction drag of two diaphragm coupling rod sealings, unit is N, F _F2Be the surface friction drag of valve stem seal, unit is N, F _F3Be the surface friction drag of valve stem seal, unit is N.

In the accompanying drawing 1; When delivery pressure mouth d receives extraneous some accidentalia influence, moment P1 increases and when surpassing specified value, following diaphragm 7 can raise up under the feedback pressure effect; The two diaphragm coupling rods 5 that link together through mounting kit and following diaphragm 7; Along with the distortion of descending diaphragm 7 moves upward, thereby valve rod 13 separates with two diaphragm coupling rods 5, and spool 11 is upwards closed delivery outlet; Two diaphragm coupling rods 5 are hollow, form a hollow pipeline in it, and this pipeline and flow-off f communicate, and flow-off f and spill cavity 16 communicate; Therefore, when valve rod 13 with after two diaphragm coupling rods 5 separate, unnecessary gas has two diaphragm coupling rods 5 to overflow with flow-off f, the pressure in the pressure feedback chamber 14 are crossed the outflow of flow-off f along with air communication and are diminished, reach state of equilibrium after, thereby make delivery pressure P ₁Reduce to original setting.The effect of delivery pressure feedback port e is a dynamic performance of improving valve, improves the precision of voltage regulation of valve.

Referring to Fig. 2, Fig. 3 and shown in Figure 4,

The m of unit ², The m of unit ², as can beappreciated from fig. 3, upper diaphragm diameter D ₁Be far longer than two diaphragm coupling rods footpath d ', upper diaphragm active area A ₁With

Following iris action area approximation equates; So, can know by Fig. 3 force analysis: when balance

${{\mathrm{<figure-callout\; id="1"\; label="F\; m"\; filenames="HSA00000211263600011.png"\; state="\{\{state\}\}">F</figure-callout>}}_m}^{\&prime;}+{\mathrm{<figure-callout\; id="1"\; label="F\; f"\; filenames="HSA00000211263600011.png"\; state="\{\{state\}\}">F</figure-callout>}}_f+{\mathrm{<figure-callout\; id="1"\; label="p"\; filenames="HSA00000211263600011.png"\; state="\{\{state\}\}">p</figure-callout>}}_1\&CenterDot;{\mathrm{<figure-callout\; id="1"\; label="A"\; filenames="HSA00000211263600011.png"\; state="\{\{state\}\}">A</figure-callout>}}_1=p_w\&CenterDot;{\mathrm{<figure-callout\; id="1"\; label="A"\; filenames="HSA00000211263600011.png"\; state="\{\{state\}\}">A</figure-callout>}}_1^{\&prime;}+p_n\&CenterDot;{\mathrm{<figure-callout\; id="1"\; label="A"\; filenames="HSA00000211263600011.png"\; state="\{\{state\}\}">A</figure-callout>}}_1$

Because $A_1\&ap;{\mathrm{<figure-callout\; id="1"\; label="A"\; filenames="HSA00000211263600011.png"\; state="\{\{state\}\}">A</figure-callout>}}_1^{\&prime;}$

So following formula can be written as:

${{\mathrm{<figure-callout\; id="1"\; label="F\; m"\; filenames="HSA00000211263600011.png"\; state="\{\{state\}\}">F</figure-callout>}}_m}^{\&prime;}+{\mathrm{<figure-callout\; id="1"\; label="F\; f"\; filenames="HSA00000211263600011.png"\; state="\{\{state\}\}">F</figure-callout>}}_f+{\mathrm{<figure-callout\; id="1"\; label="p"\; filenames="HSA00000211263600011.png"\; state="\{\{state\}\}">p</figure-callout>}}_1\&CenterDot;A_1=(p_w+p_n)\&CenterDot;A_1---\left(1\right)$

Can know by Fig. 3 and Fig. 4 force analysis:

${\mathrm{<figure-callout\; id="1"\; label="F\; m"\; filenames="HSA00000211263600011.png"\; state="\{\{state\}\}">F</figure-callout>}}_m={{\mathrm{<figure-callout\; id="1"\; label="F\; m"\; filenames="HSA00000211263600011.png"\; state="\{\{state\}\}">F</figure-callout>}}_m}^{\&prime;}---\left(2\right)$

F _m1+F _f2+F _f3＝F _c (3)

Know by formula (1), (2) and (3)

${\mathrm{<figure-callout\; id="1"\; label="p"\; filenames="HSA00000211263600011.png"\; state="\{\{state\}\}">p</figure-callout>}}_1=(p_w+p_n)-\frac{F_c-({\mathrm{<figure-callout\; id="1"\; label="F\; f"\; filenames="HSA00000211263600011.png"\; state="\{\{state\}\}">F</figure-callout>}}_f+{\mathrm{<figure-callout\; id="2"\; label="F\; f"\; filenames="HSA00000211263600011.png"\; state="\{\{state\}\}">F</figure-callout>}}_f+F_{f3})}{A_1}---\left(4\right)$

So can draw following important conclusion:

(1) the delivery pressure size is irrelevant with spool latus rectum size;

(2) variation of incoming pressure is irrelevant to the delivery pressure size during valve balance;

(3) the working pressure difference P of delivery pressure and adjusting _wAnd external pressure P _nSize is relevant.

The present invention can adjust delivery pressure automatically with Environmental Conditions (exhaust environment) variation in pressure makes effective working pressure value size of preset constant, owing to adopted the balanced type valve core structure, when the main valve balance, the variation of incoming pressure does not have influence to delivery pressure.It is mainly used in the pneumatic machinery (cylinder, gas motor etc.) that is operated in the enclosed environment.

Claims (3)

1. adjust the environment defferential valve automatically for one kind, comprise upper valve body, middle valve body and following valve body, it is characterized in that: sealing is provided with upper diaphragm between said upper valve body and the middle valve body, and sealing is provided with down diaphragm between said middle valve body and the following valve body;

The top of valve body is provided with a flow-off in said, and the set inside of valve body has vertically arranged pair of diaphragm coupling rod of a hollow in said, and said valve body down is provided with the delivery pressure feedback port;

Said defferential valve works in the enclosed environment;

Said upper valve body is provided with an exhaust environment pressure introduction port, and said upper valve body and upper diaphragm constitute an airtight discharge plenum;

Valve body and upper diaphragm constitute an airtight spill cavity in said, and said flow-off is positioned at spill cavity;

Valve body constitutes airtight effective working pressure chamber with following diaphragm in said, and the bottom of valve body is provided with effective working pressure inlet opening in said, and said effective working pressure inlet opening is positioned at effective working pressure chamber;

Said valve body down constitutes an airtight pressure feedback chamber with following diaphragm; In the pressure feedback chamber; Be provided with a vertically arranged valve rod in the valve body under said; The top of said valve rod is adjacent with the afterbody of two diaphragm coupling rods, under the pressure balance in the pressure feedback chamber, is in air-tight state between valve rod and the two diaphragm coupling rod;

Said valve body down is provided with a source of the gas inlet opening and a delivery pressure mouth; Be provided with vertically arranged spool at the said middle part of valve body down; The top of said spool is connected with the bottom of said valve rod; Be provided with a Returnning spring between the bottom of the bottom of said spool and said valve body down, be provided with seal spool between the side walls of spool and following valve body;

Said pair of diaphragm coupling rod is fixed between upper diaphragm and the following diaphragm through mounting kit;

Be provided with valve stem seal between the upper inside wall of said valve rod and following valve body.

2. automatic adjustment environment defferential valve according to claim 1; It is characterized in that: owing to adopted upper diaphragm and following diaphragm; The delivery pressure of said delivery pressure mouth is with the change in pressure in the discharge plenum, but the pressure size in effective working pressure chamber of preset remains unchanged.

3. automatic adjustment environment defferential valve according to claim 1, it is characterized in that: when spool reached state of equilibrium, the variation of the incoming pressure of source of the gas inlet opening did not have influence to the delivery pressure of delivery pressure mouth.

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