CN1436943A - Directly driven hydraulic overflow valve - Google Patents
Directly driven hydraulic overflow valve Download PDFInfo
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- CN1436943A CN1436943A CN 03118747 CN03118747A CN1436943A CN 1436943 A CN1436943 A CN 1436943A CN 03118747 CN03118747 CN 03118747 CN 03118747 A CN03118747 A CN 03118747A CN 1436943 A CN1436943 A CN 1436943A
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- oil pocket
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Abstract
The directly driven hydraulic overflow valve is used as pressure control valve in water medium hydraulic transmission system. The valve has valve core piston with central notch and small side radial hole inside the oil cavity and pushed with spring, regulating rod in the upper part of the valve body and to hold down the spring, cavity inside the valve body and parallel to the oil cavity, sealed plunger inside the cavity to separate the cavity into air cavity and subsidiary oil cavity communicated with the oil cavity, water inlet and water outlet in the lower part of the valve body and communicated via return water cavity. The present invention has increased oil gas spring to raise the reliability and stability of the valve and to prevent value core jamming, and the sealed cavity of the oil gas spring can raise the anti-fouling capacity of the valve to make it suitable for work in polluted marine environment.
Description
Technical field
The present invention is the valve class, particularly the system pressure control valve.
Background technique
From the theory and practice of oil pressure valve as can be known: direct-acting overflow valve is simple in structure, but has the working stability problem.Because the density of water is big and viscosity is little, the working stability problem of water hydraulic relief valve may be even more serious than oil pressure in the hydraulic pressure system.To being used under the marine pollution environment and in the hydraulic power system of underwater operation tool, the water outlet of valve has backflow " addle " to pour in down a chimney to enter spring chamber unavoidably, silt in the water influences the work of spool inevitably, has brought potential water hydraulic relief valve integrity problem.
The oil pressure direct-acting overflow valve is used always and is set up the working stability that additional damping cavity is improved direct-acting overflow valve.If the direct-acting type water hydraulic relief valve adopts the damping cavity structure of oil pressure direct-acting overflow valve, then brought the friction jam (mainly being) between spool and the valve pocket guiding position because the viscosity of water is little.The direct-acting type water hydraulic relief valve of Finland Danfoss company has adopted structural type as shown in Figure 1 on the market at present.This valve is by the backwater cavity at valve dynamic performance and the working stability that damping cavity is improved valve to be set.Can not avoid jam fully between spool (metal) and the valve pocket (plastics), can not adapt under the marine pollution environment and work.
Summary of the invention
The present invention proposes a kind of direct-acting type water hydraulic relief valve, is used to improve the working stability of spool, avoids the jam of spool, improves the sea water pollution resisting ability of valve simultaneously.
A kind of direct-acting type water hydraulic relief valve of the present invention, valve core piston is positioned at the oil pocket of valve axis and by spring top clamping, adjustable lever is positioned at valve body upper end and holddown spring, it is characterized in that: the parallel cavity body that is embedded with oil pocket in (1) valve body, its built-in sealed plunger is divided into air cavity and secondary oil pocket with cavity body, and the latter is communicated with the oil pocket passing hole channel; (2) valve body lower end portion has water intake and water outlet, and both interconnect by backwater cavity in valve body; (3) the valve core piston axial centre has shrinkage pool, and shrinkage pool communicates with valve core piston side radial hole, the built-in plug screw that has damping hole of shrinkage pool.
Described direct-acting type water hydraulic relief valve, the air cavity upper end portion can be provided with gas charging valve, and adjustable lever or oil pocket upper end valve body can have the vent that is communicated with oil pocket.
Described direct-acting type water relief valve, it is further characterized in that the angle of taper of valve core piston end angle of taper greater than the water inlet valve seat, the backwater cavity shape of cross section is a taper type.
Described direct-acting type water relief valve, the valve core piston small end can be equipped with seal ring.
Advantage of the present invention is:
1) by setting up hydro-pneumatic spring, improves the working stability of spool, avoided the jam of spool, thereby improved the functional reliability of valve." hydro-pneumatic spring " not only can provide damping force for " spring-quality " system of valve core piston, and hydraulic oil can improve the lubricating condition of valve core piston again, and simultaneously, the motion of valve core piston has guiding.This has created condition for the working stability of this hydraulic valve and functional reliability.
2) the airtight cavity of hydro-pneumatic spring has improved the ability of the sea water pollution resisting of valve.The valve core piston of this valve and spring are isolated in the airtight cavity, can improve the operating conditions of valve core piston effectively, avoid the erosion of seawater and the inefficacy that marine pollutant causes.
3) the valve port cross-sectional geometry of particular design and valve pocket structure help the harm that alleviates cavitation and cavitate and bring.Serve as the following valve body of valve seat and make aspect the cavitation erosion preventing of 1Cr18Ni9Ti, the spool bronze material, these two kinds of materials all have the ability of certain gasproof erosion.In order to alleviate cavitation, also structurally do trickle processing, the valve core piston cone angle of the primary valve suitably cone angle than valve seat is big.In addition, the water conservancy diversion shape face that has designed the valve port downstream chamber makes the current smoothness, and is beneficial to alleviating the flow noise.
Description of drawings
Fig. 1 is existing direct-acting type water hydraulic relief valve structural representation,
Fig. 2 is a structural representation of the present invention.
Embodiment
Fig. 2 is a kind of water hydraulic relief valve schematic representation of the present invention.The working pressure of this valve is 14MPa (maximum service pressure is 21Mpa), and the nominal operation flow is 40 l/min (the maximum functional flow is 60 l/min).It is additional that hydro-pneumatic spring is arranged is the characteristics of this valve.During quiescent operation, valve core piston 2 overcomes the active force of spring 10 and oil pocket pressure and opens under the pressure effect of water intake 14, and stable operation under specific aperture is kept system works pressure.Oil pocket 9, secondary oil pocket 12 and air cavity 8 constitute the hydro-pneumatic spring device, and the function of air cavity 8 is regulated the volume compression amount of push rod 6 down except providing static, can also make the quiescent operation pressure of hydro-pneumatic spring be unlikely too high, and help the adjusting of push rod 6.Under the dynamic operating condition, gap location between the upper piston effect of valve core piston 2 and the pilot hole of upper valve body 4 can form a certain amount of viscous damping power, in addition, the hydraulic oil of oil pocket 9 is under the effect that valve core piston makes progress, the hydraulic oil that squeezes the valve core piston upper oil chamber, make it to form the pressure difference between piston upper oil chamber and the secondary oil pocket, finally form a downward damping force by damping hole 3 additional on the valve core piston; Equally, when valve core piston moves downward, produce a damping force that makes progress.Because the air cavity working pressure of this valve is not too high (less than 1Mpa), so the decrement of hydraulic oil is little far away than the decrement of gas, the additional spring force of hydro-pneumatic spring is little to the influence of the static properties of this valve and dynamic performance.In order to prevent in the working procedure, gas dissolves in hydraulic oil and makes hydraulic oil " emulsification ", isolate with aluminum alloy sealed plunger 11 between the oil pocket of hydro-pneumatic spring and the air cavity, ignore of the influence of the dynamic response of sealed plunger 11 dynamic response characteristic of the gentle cavity pressure of oil pocket pressure.Valve core piston small end and combined seal ring 13 (teflon add rubber ring) good sealing effect little with surface friction drag comes seal oil chamber and backwater cavity 15, and oil pocket is isolated with backwater cavity reliably.Inflate to air cavity 8 by gas charging valve 7.In advance with upper valve body 4 and following valve body 1, and valve core piston 2 is mounted to one, and adds an amount of hydraulic oil at oil pocket 9 and secondary oil pocket 12, notes the residual air of eliminating valve pocket.Then air cavity 8 is installed on the upper valve body, mounting spring 10 and push rod 6 and cover plate are tightened venting plug 5 at last again.Pressurized air is adjusted the initialization pressure of hydro-pneumatic spring by gas charging valve 7.
Claims (5)
1. direct-acting type water hydraulic relief valve, valve core piston are positioned at the oil pocket of valve axis and by spring top clamping, adjustable lever is positioned at valve body upper end and holddown spring, it is characterized in that:
(1) the parallel cavity body that is embedded with oil pocket in the valve body, its built-in sealed plunger with cavity body be divided into air cavity with
Secondary oil pocket, the latter is communicated with the oil pocket passing hole channel;
(2) valve body lower end portion has water intake and water outlet, and both connect mutually by backwater cavity in valve body
Logical;
(3) the valve core piston axial centre has shrinkage pool, and shrinkage pool communicates with valve core piston side radial hole, and is recessed
The plug screw of the built-in band damping hole in hole.
2. direct-acting type water hydraulic relief valve as claimed in claim 1 is characterized in that the air cavity upper end portion is provided with gas charging valve, and adjustable lever or oil pocket upper end valve body have the vent that is communicated with oil pocket.
3. direct-acting type water hydraulic relief valve as claimed in claim 1 or 2 is characterized in that the angle of taper of valve core piston end angle of taper greater than the water inlet valve seat, and the backwater cavity shape of cross section is a taper type.
4. direct-acting type water relief valve as claimed in claim 1 or 2 is characterized in that the valve core piston small end is equipped with seal ring.
5. direct-acting type water relief valve as claimed in claim 3 is characterized in that the valve core piston small end is equipped with seal ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03118747 CN1436943A (en) | 2003-03-08 | 2003-03-08 | Directly driven hydraulic overflow valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03118747 CN1436943A (en) | 2003-03-08 | 2003-03-08 | Directly driven hydraulic overflow valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1436943A true CN1436943A (en) | 2003-08-20 |
Family
ID=27634487
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03118747 Pending CN1436943A (en) | 2003-03-08 | 2003-03-08 | Directly driven hydraulic overflow valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1436943A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108131345A (en) * | 2017-12-21 | 2018-06-08 | 宁波文泽机电技术开发有限公司 | A kind of high-damping direct-acting overflow valve |
| CN113217254A (en) * | 2021-05-28 | 2021-08-06 | 北京天地玛珂电液控制***有限公司 | Fluid power generation device |
-
2003
- 2003-03-08 CN CN 03118747 patent/CN1436943A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108131345A (en) * | 2017-12-21 | 2018-06-08 | 宁波文泽机电技术开发有限公司 | A kind of high-damping direct-acting overflow valve |
| CN113217254A (en) * | 2021-05-28 | 2021-08-06 | 北京天地玛珂电液控制***有限公司 | Fluid power generation device |
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| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |