CN1041031A - Capillary damp tube pressure regulating method and pressure controlled valve - Google Patents
Capillary damp tube pressure regulating method and pressure controlled valve Download PDFInfo
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- CN1041031A CN1041031A CN 88106492 CN88106492A CN1041031A CN 1041031 A CN1041031 A CN 1041031A CN 88106492 CN88106492 CN 88106492 CN 88106492 A CN88106492 A CN 88106492A CN 1041031 A CN1041031 A CN 1041031A
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- pressure
- valve
- capillary
- spool
- damp tube
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- Control Of Fluid Pressure (AREA)
- Servomotors (AREA)
- Electrically Driven Valve-Operating Means (AREA)
Abstract
Capillary damp tube pressure regulating method and pressure controlled valve, utilize the uniform pressure variation in the capillary tube to convert angular displacement signal to pressure signal, and then the outlet of control valve or inlet pressure, the signal conversion grade and the power-amplifier stage of secondary valve can be made on the spool.This valve arrangement is simple, the repeatability height, and good stability, cost is low, is adapted at promoting the use of.
Description
Fluid control elements mainly is divided into Flow valve and pressure valve two big classes.Flow valve generally is to carry out work by the principle of the area that changes restriction; Pressure valve generally is the principle work that depended on pressure thrust and spring force balance each other.For the setting-pressure accuracy that improves pressure valve and inflow-rate of water turbine are made it pilot valve and main valve two-stage type usually, by pilot valve displacement signal is converted to pressure signal, by main valve this pressure signal is amplified the outlet (reduction valve) or the inlet pressure (relief valve) of pilot pressure valve then, and make it keep substantially constant.This working principle of traditional hydrodynamic pressure valve determines it to have following characteristics:
1, the outlet of valve or inlet pressure are general only relevant with the decrement of spring, are not subjected to the influence of oil supply pressure fluctuation or load.
2, owing to there is one spring force-pressure signal conversion equipment, therefore be subjected to effect of non-linear such as frictional force, gap easily, make the repeatability variation of pressure valve.
3, for the two-stage pressure valve, structure is comparatively complicated, and higher to the required precision of Regulation spring.
4,, various dampings often are set, on the control oil channel of valve because the influence of fluid institute unintentional nonlinearity factor is difficult to generally accomplish that valve all has good stability under various operating modes in order to guarantee the stability of pressure valve.
If with one pressure is p
0The fluid of (constant) feeds in one section capillary damp tube, because the influence of viscosity, the pressure of fluid will evenly descend along the length direction of capillary damp tube (as Fig. 1), (Fig. 1 a) or inlet pressure (Fig. 1 b) also can make it be able to continuous adjusting to control the outlet pressure of main valve by the pressure that obtains difference in the capillary damp tube.So just, can solve the deficiencies in the prior art.
1, two, the digital reduction valve of threeway
The structure of this valve as shown in Figure 2.It is made of 5 major parts such as end cap 1, valve seat 2, spool 3, shaft coupling 4 and stepper motors 5.End cap and stepper motor all link to each other with valve seat by screw, and step motor shaft links to each other with spool by shaft coupling.Spool has two freedom of movement in valve housing: it can rotate with stepper motor on the one hand; Can move vertically on the other hand.On the periphery of spool left end shoulder, offer two damping slot A axisymmetrically, its two ends communicate with import and low-pressure cavity F respectively, also offer two passes B axisymmetrically and intersect with two damping slots respectively on the internal surface of column of valve seat left end, valve left side chamber C experiences on the damping slot certain any pressure by this passage.The right chamber passage D of valve communicates with the outlet of valve.Under static operating mode, the left cavity pressure of valve and right cavity pressure (outlet pressure equates, therefore makes the left chamber of valve pass through passage by the stepper motor driven valve core) are experienced the pressure of difference on the damping slot, outlet pressure that can continuous modulating valve.
If the width of the central shoulder of spool is made with the width of valve pocket groove to equate then to be a three-way valve; If the width of the central shoulder of spool greater than the width of valve pocket groove then this valve be a Twoway valves.Then can become common reduction valve if change stepper motor into handwheel.
2, four-way digital type pressure valve
The structure of four-way digital type pressure valve as shown in Figure 3.Its component part title and connecting mode and two, three-way pressure reducing valve are identical, and just spool is different with the structure of valve seat, and spool has four shoulders, and two central shoulders are controlled p
1And p
2The pressure of passage.Two mutual axisymmetric damping slots are respectively arranged on the periphery of left and right end shoulder, and its pressure distribution as shown in Figure 3.The pressure in the left and right chamber of valve is controlled by the pressure of the damping slot on the spool land respectively, can be obtained by so-called coupling-symmetric condition (1) under steady state condition:
P
1-P
2=2P
O- (θ)/(θ
O)
θ
0The cornerite of-damping slot.
The excursion of θ is-(θ
O)/2～(θ
O)/2.Therefore make it be in different radial positions by the stepper motor driven valve core, can obtain different p
1-p
2Value.
Above-mentioned various pressure controlled valve all is to utilize the uniform pressure in the capillary tube to change angular displacement signal switching to pressure signal, and then the outlet of control valve or inlet pressure, and the signal conversion grade and the power-amplifier stage of secondary valve is made on the spool.This working principle of hydrodynamic pressure valve determines it to have following characteristics:
1, structure is simple especially, need not any spring;
2, reliability increases.Traditional secondary pressure valve is made of plural spring and many component, so reliability is relatively poor, and the life-span is short;
3, repeatability height.Owing to utilize the even decline of pressure in the capillary damp tube to realize the conversion of angular displacement signal and pressure signal, so be not subjected to effect of non-linear such as the gap of traditional pressure valve pilot valve and frictional force, this repeatability height;
4, good stability.The capillary damp tube not only plays angular displacement-pressure signal transformation, and the axial motion of spool is had very big damping function, so pressure valve has good stability.
5, insensitive to temperature variation.This is because the pressure distribution of the fluid in the capillary damp tube is temperature independent;
6, be used for the hydraulic pressure valve, then valve has the good linearity;
7, require the valve inlet pressure constant or [constant arranged.Because present 95% hydraulic system all adopts [constant and bleed pressure generally constant, so this requirement of this valve does not make its application area restricted;
8, same a kind of valve can be made hand-adjusting type, digital and proportion expression simultaneously;
9, the balanced radial force of spool, required rotary driving force square is less, and digital as if making, then stepper motor has higher response frequency.
Claims (3)
1, method of fluid pressure regulator, the fluid that is characterized as a constant pressure of the present invention feeds in the capillary damp tube, pressure by fluid obtains the pressure of difference in the capillary damp tube along even decline of the length direction of capillary damp tube, the outlet of control fluid pressure valve or the pressure of inlet.
2, two, the digital reduction valve of threeway, of the present invention being characterized as by end cap, valve seat, spool, shaft coupling, stepper motor formed, end cap and motor link to each other with valve seat by screw, step motor shaft links to each other with spool by shaft coupling, and offer two damping slots on the periphery of spool left end shoulder axisymmetrically, its two ends communicate with import and low-pressure cavity F respectively, also offer two passes B axisymmetrically at the internal surface of column of valve seat left end and intersect with two damping slots respectively.
3,, it is characterized by spool and can do four public shoulders as described in the claim 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88106492 CN1041031A (en) | 1988-09-03 | 1988-09-03 | Capillary damp tube pressure regulating method and pressure controlled valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88106492 CN1041031A (en) | 1988-09-03 | 1988-09-03 | Capillary damp tube pressure regulating method and pressure controlled valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1041031A true CN1041031A (en) | 1990-04-04 |
Family
ID=4834265
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88106492 Pending CN1041031A (en) | 1988-09-03 | 1988-09-03 | Capillary damp tube pressure regulating method and pressure controlled valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1041031A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104729350A (en) * | 2013-12-19 | 2015-06-24 | 珠海格力电器股份有限公司 | Sealing valve and heat storage device with same |
| CN107969151A (en) * | 2015-05-25 | 2018-04-27 | 阿尔诺·德雷克塞尔 | pressure control device for liquid |
-
1988
- 1988-09-03 CN CN 88106492 patent/CN1041031A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104729350A (en) * | 2013-12-19 | 2015-06-24 | 珠海格力电器股份有限公司 | Sealing valve and heat storage device with same |
| CN104729350B (en) * | 2013-12-19 | 2017-11-21 | 珠海格力电器股份有限公司 | Sealing valve and heat storage device with same |
| CN107969151A (en) * | 2015-05-25 | 2018-04-27 | 阿尔诺·德雷克塞尔 | pressure control device for liquid |
| CN107969151B (en) * | 2015-05-25 | 2021-04-23 | 阿尔诺·德雷克塞尔 | Pressure control device for liquid |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |