CN2713193Y - Medium and high pressure direct-acting hydraulic overflow valve - Google Patents
Medium and high pressure direct-acting hydraulic overflow valve Download PDFInfo
- Publication number
- CN2713193Y CN2713193Y CN 200420017780 CN200420017780U CN2713193Y CN 2713193 Y CN2713193 Y CN 2713193Y CN 200420017780 CN200420017780 CN 200420017780 CN 200420017780 U CN200420017780 U CN 200420017780U CN 2713193 Y CN2713193 Y CN 2713193Y
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- valve
- spool
- valve seat
- utility
- amortization
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Abstract
The utility model relates to a pressure control element in water hydraulic system, in particular to a medium and high pressure direct-acting hydraulic overflow valve, belonging to a valve. The utility model is used for solving the technical problems existing in prior direct-acting relief valve, decreasing the leakage, cavitation erosion, vibration and buzz of the valve port and ameliorating the operating stability of the valve. The utility model comprises a valve base, a valve core, amortization perches, amortization sheathings, a valve pocket, a pressure adjusting spring, a spring base, an end cap and regulating screws which are positioned in the valve body in sequence; the valve core is a cavity; the corresponding bores of the amortization sheathing and the amortization perch forms fit clearances, and the cavities between the fit clearances form amortization chambers; the valve port composed of the valve base and valve core is in a cone valve structure; the shoulder of the valve core is provided with eyelets evenly; the cylinder of the back end of the valve core and the bore of the valve pocket form a guide face. The utility model can be used as a pressure control valve in water hydraulic system whose active medium is seawater, sweet water or high water based. Compared to congener easing valves, the utility model has the advantages of small leakage, good cavitation erosion proof performance, small vibration, low buzz, and good operating stability.
Description
Technical field
The utility model relates to the pressure control valve in a kind of water hydraulic system, valve kind, be applicable to in seawater, fresh water, the high mesohigh water hydraulic system that makes the work medium such as water base as pressure controlled valve.
Background technique
Relief valve is a pressure control valve commonly used in the hydraulic system, can be used as level pressure relief valve or safety valve, and traditional relief valve adopts hydraulic oil to make the work medium more.When relief valve adopts water (water base) medium when (comprising seawater, fresh water or high water base etc.), the cavitation erosion problem is outstanding than the oil pressure relief valve.This is because the pressure for vaporization of water is much higher than mineral oil, when water during in the valve port flow at high speed, the flow field local compression can be lower than the pressure for vaporization of water, and air pocket and cavitation phenomenon will take place, make valve port place material be subjected to cavitation erosion, thereby reduce the functional reliability and the life-span of valve.The working pressure of relief valve is high more, and air pocket and cavitation phenomenon are serious more.
Another key technology difficult problem that water hydraulic relief valve exists is vibration, noise and working stability problem.Except the reason of air pockets erosion, the reason of generation is multiple in addition: 1) because the viscosity of water is low, viscous damping is little; 2) density of water, Young's modulus are big than mineral oil, and " water attack " phenomenon is serious; 3) medium goes out stream and spring force and departs from the radial force that reason such as spool axle center produces and make the spool polarization in that valve port is inhomogeneous.In addition, because the viscosity of water is low, the leakage problem at valve port place is more serious.
Fig. 3 is direct-acting type water hydraulic relief valve (the Trostmann E..Water Hydraulics Control Technology.Marcel Dekker that Denmark Danfoss company produces, Inc., New York, 1996), this valve has improved the working stability of valve to a certain extent by in the spool rear end damping cavity being set.But spool is easy to polarization, and consequent vibration, noise and working stability problem still exist.The material that this valve adopted can not be used seawater in addition, only is applicable to fresh water or the high not strong medium of corrosivity such as water base.
Summary of the invention
The utility model provides a kind of middle and high straightening dynamic formula water hydraulic relief valve, be used to solve the above-mentioned technical barrier that direct-acting overflow valve exists, depress work middle and high, reduce valve port leakage, cavitation erosion, vibration, noise, improve the working stability of valve, be applicable to the strong low viscosity media of corrosivity such as seawater simultaneously.
A kind of middle and high straightening dynamic formula water hydraulic relief valve of the present utility model, be included in valve seat 1, spool 2, damper rod 3, damping cover 4, pressure adjusting spring 5, spring seat 6, end cap 8 and the adjusting screw rod 7 arranged successively in the valve body 9, spool 2 is a cavity, damper rod 3 by the different cylindrical body of the diameter of axially-aligned constitute, wherein two sections cylndrical surface form matching gap with damping cover 4 corresponding endoporus respectively, the cavity formation damping cavity 10 between two matching gaps; It is characterized in that valve seat 1, spool 2, damper rod 3, damping cover 4 place in the valve pocket 11, the valve port place that valve seat 1 and spool 2 form is a cone valve structure, the cone angle of spool 2 ends is slightly larger than the cone angle of valve seat 1 endoporus oral area, spool 2 shoulders evenly have aperture, and the endoporus of the cylndrical surface of spool tail end and valve pocket 11 forms guide surface.
Described middle and high straightening dynamic formula water hydraulic relief valve, it is further characterized in that: damper rod 3 transmits pressure adjusting spring power with spool 2 cavity endoporus contact matching, and the contacting point of damper rod end and spool is a sphere.
Described middle and high straightening dynamic formula water hydraulic relief valve, when relief valve was worked under elevated pressures, it was two-stage throttle orifice structure that the cone angle of valve seat 1 endoporus oral area can have ring-shaped step, valve seat and spool formation valve port.
Described middle and high straightening dynamic formula water hydraulic relief valve, it is characterized in that: valve seat and spool adopt soft hard material pairing, valve seat can adopt lower titanium alloy of hardness or monel or Austenitic Stainless Steel directly to process, and spool can adopt through the Martensitic Stain Less Steel of enhancement process or Precipitation-hardening Stainless Steel.
The technical solution adopted in the utility model is leaked in order to reduce, and spool 2 adopts the cone valve structure of good airproof performance.For reducing the spool polarization, in the design of spool tail end the guide cylinder face is arranged, and form matching gap with valve pocket 11 endoporus, provide guiding to valve core movement.In order to improve the working stability of spool, the damper rod 3 that is provided with in the spool rear end forms matching gap respectively and between the damping cover 4 corresponding endoporus for the large and small cylndrical surface on T shape cylindrical body, the damper rod, and the cavity between two matching gaps forms damping cavity 10, and the variation in pressure when utilizing valve core movement in the damping cavity increases the kinetic damping of spool.In order to make the spring force stepless action on spool, will be designed to spheric structure with the contacting point of spool on the damper rod.
Be the harm that alleviates air pocket and reduce to cavitate, taked following measures: 1) spool and valve seat all are designed to cone structure at the valve port place, and the spool cone angle is slightly larger than the valve seat cone angle, help suppressing air pocket; 2) valve seat and spool adopt soft-hard material pairing, valve seat can adopt lower titanium alloy of hardness or monel (as Monel etc.) or Austenitic Stainless Steel (as 1Cr18Ni9Ti) directly to process, spool can adopt Martensitic Stain Less Steel (being only applicable to fresh water or high water base) or the Precipitation-hardening Stainless Steel through enhancement process, helps the destruction that reduces to cavitate; 3) single-stage throttle orifice shown in Figure 1 can change two-stage throttle orifice shown in Figure 2 into, more helps reducing cavitation erosion.
This relief valve be applicable to in seawater, fresh water, the high mesohigh water hydraulic system that makes the work medium such as water base as pressure controlled valve.Compare with similar overflow, leak little, cavitation resistive property good, vibration is little, noise is low, good operating stability.
Description of drawings
Fig. 1 is a kind of embodiment's of the utility model a structural representation.
Fig. 2 is that valve seat and spool formation valve port are a kind of enforcement state of two-stage throttle orifice structure.
Fig. 3 is a Danfoss direct-acting type water hydraulic relief valve structural representation.
Label among the above-mentioned figure is: valve seat 1, spool 2, damper rod 3, damping cover 4, pressure adjusting spring 5, spring seat 6, adjusting screw rod 7, end cap 8, valve body 9, damping cavity 10, valve pocket 11, pogo barrel 12.
Embodiment
As shown in Figure 1, a kind of embodiment of the utility model comprises: valve seat 1, spool 2, damper rod 3, damping cover 4, pressure adjusting spring 5, spring seat 6, adjusting screw rod 7, end cap 8, valve body 9, valve pocket 11 etc.Spool is a cone valve structure.The spool tail end is provided with the guide cylinder face, and forms matching gap with valve body inner bore, provides guiding to valve core movement.Be provided with damper rod in the spool rear end, the large and small cylndrical surface on the damper rod respectively and damping overlap between the corresponding endoporus and form matching gap, and the cavity between two matching gaps forms damping cavity 10.Contacting point with spool on the damper rod is a spheric structure.During assembling, valve seat 1 is pressed on the valve body 9 endoporus left sides by valve pocket 11, and valve pocket 11 and damping cover 4 is pressed in the valve body by end cap 8.
High pressure water enters from the P mouth, and during working pressure that the hydraulic coupling on acting on spool is set greater than pressure adjusting spring, spool is opened, after water flows out through valve port, reach the spool back cavity by equally distributed aperture on the spool, the inclined hole that puts through overdamping enters spring chamber again, after the outflow of O mouth.Spool is in a certain equilibrium position under the operation of hydraulic coupling, spring force, frictional force.The pressure of P mouth can be set by the pre compressed magnitude that changes pressure adjusting spring.Spool is in the dynamic adjustments process, polarization when the guide surface on the spool can suppress the spool unlatching, the variation of damping cavity 10 volumes simultaneously will cause the variation in pressure in this chamber, thereby produce an additional forces opposite with the valve core movement direction, increase the damping of valve core movement, improved the working stability of spool.
Fig. 2 is that valve seat and spool form the another kind enforcement state that valve port is a two-stage throttle orifice structure, and when relief valve was worked under elevated pressures, it was two-stage throttle orifice structure that the cone angle of valve seat 1 endoporus oral area has ring-shaped step, valve seat and spool formation valve port.
Claims (5)
1, a kind of middle and high straightening dynamic formula water hydraulic relief valve, be included in valve seat [1], spool [2], damper rod [3], damping cover [4], pressure adjusting spring [5], spring seat [6], end cap [8] and the adjusting screw rod [7] arranged successively in the valve body [9], spool [2] is a cavity, damper rod [3] by the different cylindrical body of the diameter of axially-aligned constitute, wherein two sections cylndrical surface form matching gap with the corresponding endoporus of damping cover [4] respectively, the cavity formation damping cavity [10] between two matching gaps; It is characterized in that valve seat [1], spool [2], damper rod [3], damping cover [4] place in the valve pocket [11], the valve port place that valve seat [1] and spool [2] form is a cone valve structure, the cone angle of spool [2] end is slightly larger than the cone angle of valve seat [1] endoporus oral area, spool [2] shoulder evenly has aperture, and the endoporus of the cylndrical surface of spool tail end and valve pocket [11] forms guide surface.
2, middle and high straightening dynamic formula water hydraulic relief valve as claimed in claim 1 is characterized in that: damper rod [3] transmits pressure adjusting spring power with spool [2] cavity endoporus contact matching, and the contacting point of damper rod end and spool is a sphere.
3, middle and high straightening dynamic formula water hydraulic relief valve as claimed in claim 1 or 2, it is characterized in that: when relief valve was worked under elevated pressures, it was two-stage throttle orifice structure that the cone angle of valve seat [1] endoporus oral area has ring-shaped step, valve seat and spool formation valve port.
4, middle and high straightening dynamic formula water hydraulic relief valve as claimed in claim 1 or 2, it is characterized in that: valve seat and spool adopt soft-hard material pairing, valve seat can adopt lower titanium alloy of hardness or monel or Austenitic Stainless Steel directly to process, and spool can adopt through the Martensitic Stain Less Steel of enhancement process or Precipitation-hardening Stainless Steel.
5, middle and high straightening dynamic formula water hydraulic relief valve as claimed in claim 3, it is characterized in that: valve seat and spool adopt soft-hard material pairing, valve seat can adopt lower titanium alloy of hardness or monel or Austenitic Stainless Steel directly to process, and spool can adopt through the Martensitic Stain Less Steel of enhancement process or Precipitation-hardening Stainless Steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420017780 CN2713193Y (en) | 2004-04-16 | 2004-04-16 | Medium and high pressure direct-acting hydraulic overflow valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420017780 CN2713193Y (en) | 2004-04-16 | 2004-04-16 | Medium and high pressure direct-acting hydraulic overflow valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2713193Y true CN2713193Y (en) | 2005-07-27 |
Family
ID=34870350
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420017780 Expired - Lifetime CN2713193Y (en) | 2004-04-16 | 2004-04-16 | Medium and high pressure direct-acting hydraulic overflow valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2713193Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113719656A (en) * | 2021-08-30 | 2021-11-30 | 华中科技大学 | Follow-up valve core assembly, direct-acting overflow valve and pilot-operated overflow valve |
-
2004
- 2004-04-16 CN CN 200420017780 patent/CN2713193Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113719656A (en) * | 2021-08-30 | 2021-11-30 | 华中科技大学 | Follow-up valve core assembly, direct-acting overflow valve and pilot-operated overflow valve |
| CN113719656B (en) * | 2021-08-30 | 2022-06-14 | 华中科技大学 | Follow-up valve core assembly, direct-acting overflow valve and pilot-operated overflow valve |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20090506 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |