CN102943909B - Differential type water hydraulic relief valve - Google Patents
Differential type water hydraulic relief valve Download PDFInfo
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- CN102943909B CN102943909B CN201210398945.4A CN201210398945A CN102943909B CN 102943909 B CN102943909 B CN 102943909B CN 201210398945 A CN201210398945 A CN 201210398945A CN 102943909 B CN102943909 B CN 102943909B
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Abstract
The invention provides a differential type water hydraulic relief valve and belongs to a pressure control valve in a water hydraulic system; and problems of vibration, noises and poor working stability in the traditional direct-acting relief valve are solved. In a first kind of differential type water hydraulic relief valve, a valve seat, a valve core, a spring and a spring seat are mounted in a valve body in sequence from left to right; the right end of the valve body is sealed; a cylindrical cushion block is embedded at the left end of the cavity of the valve body; a left end cover is connected with the left end surface of the valve body by a bolt; and an adjusting screw rod and the left end cover are matched with each other by threads and pushed against the cylindrical cushion block. A second kind of differential type water hydraulic relief valve is different from the first kind of differential type water hydraulic relief valve in the following aspects: the left end of the valve body is sealed, a right end cover is connected with the right end of the cavity of the valve body by threads, a spring seat is embedded in the right end cover, and bottom surfaces of an adjusting screw rod and the right end cover are matched with each other by threads and pushed against the spring seat. The differential type water hydraulic relief valve provided by the invention has the advantages of small leakage, good cavitation resistance, small vibration, low noise, high pressure adjusting precision, good working stability and small spring force at high pressure and is suitable for medium and high pressure water hydraulic systems.
Description
Technical field
The invention belongs to the pressure controlled valve in water hydraulic system, be applicable to the water hydraulic system with seawater, fresh water, the high working medium such as water base.
Background technique
Relief valve is pressure control valve conventional in hydraulic system, can be used as level pressure relief valve or safety valve, and traditional relief valve adopts hydraulic oil to make working medium more.When relief valve adopts water (water base) medium when (comprising seawater, fresh water or high water base etc.), the vibration producing, noise and working stability problem are very serious.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 large compared with mineral oil, and " water attack " phenomenon is serious; 3) medium goes out stream and spring force and departs from the radial force that the reasons such as spool axle center produce and make spool polarization valve port is inhomogeneous; 4) because the viscosity of water is low, the leakage at valve port place is larger.
One-stage Water Hydraulic Relief Valve (the Trostmann E..Water Hydraulics Control Technology.Marcel Dekker that Tu3Shi Denmark Danfoss company produces, Inc., New York, 1996), comprise valve body 1, spring 5, spring seat 6, damping cavity 8, adjusting screw rod 10, right end cap 11, valve seat 12, dull and stereotyped spool 13, damping sleeve 14, damper rod 15 and pogo barrel 16.
This valve, by damping cavity being set in spool rear end, has improved the working stability of valve to a certain extent.But spool is easy to polarization, consequent vibration, noise and working stability problem still exist.In addition the material that this valve adopts can not be used seawater, is only applicable to fresh water or the high not strong medium of corrosivity such as water base.
For common direct-acting overflow valve, due to spring force directly and hydraulic coupling comparison, when the working pressure of relief valve is higher, required spring force is very large.Therefore, bring very large difficulty to the Design and manufacture of spring.
Summary of the invention
The invention provides two kinds of differential type water hydraulic relief valves, solve the problem of vibration, noise and the poor work stability of existing direct-acting overflow valve existence, reduce valve port leakage, cavitation erosion, vibration, noise and pressure adjusting spring rigidity, improve the working stability of valve, be applicable to the low viscosity medium that the corrosivity such as seawater are strong simultaneously.
A kind of differential type water hydraulic relief valve provided by the present invention, comprises valve body, valve seat, spool, spring, spring seat and adjusting screw rod, and valve seat, spool, spring and spring seat are housed in described valve body from left to right successively; It is characterized in that:
Described body cavity is circular port, and circular port middle part has annular undercut groove, and valve body side diverse location has respectively the liquid entering hole that is communicated with described annular undercut groove and the liquid outlet of connecting valve intracoelomic cavity; Described valve seat is shaped as cylinder, outside diameter of cylinder is mated with body cavity circular port internal diameter, valve base cavity is three coaxial rank step holes, wherein, the diameter in hole, right rank is greater than the diameter in hole, left rank, the right aperture in hole, right rank is conical surface, and valve seat side has the water inlet in radially equally distributed connection scala media hole; Described spool consists of tail end cylinder, conical section and the head end cylinder of one, tail end body diameter and the left rank of described valve seat bore dia match, conical section maximum radial diameter of section is greater than the diameter in hole, described right rank, the cone angle of conical section is less than the cone angle of the conical surface in Kong You aperture, the right rank of valve seat, spool has axial hole, the internal diameter of the corresponding tail end column part of axial hole increases, and damper is wherein installed; Hole, the left rank of spool tail end cylinder and valve seat is slidably matched, and the conical surface in Kong You aperture, the right rank of conical section and valve seat forms the valve port of cone valve structure; Valve seat and body cavity are slidably matched, and the water inlet of valve seat is positioned at valve body annular undercut groove relevant position;
The sealing of described valve body right-hand member, spring seat is embedded in the right bottom surface of body cavity, and spring is placed between spool head end cylinder and spring seat and both are spacing by rear;
Described body cavity left end is built-in with the cylindrical cushion block being slidably matched with body cavity, and cylindrical cushion block seals the left side of described valve seat, and the valve base cavity between cylindrical cushion block and spool tail end cylinder forms damping cavity;
Left end cap is connected with described valve body left side by screw, and adjusting screw rod and left end cap screw-thread fit are also withstood described cylindrical cushion block.
Another kind of differential type water hydraulic relief valve provided by the present invention, comprises valve body, valve seat, spool, spring, spring seat and adjusting screw rod, and valve seat, spool, spring and spring seat are housed in described valve body from left to right successively; It is characterized in that:
Described body cavity is circular port, and circular port middle part has annular undercut groove, and valve body side diverse location has respectively the liquid entering hole that is communicated with described annular undercut groove and the liquid outlet of connecting valve intracoelomic cavity; Described valve seat is shaped as cylinder, outside diameter of cylinder is mated with body cavity circular port internal diameter, and valve base cavity is three coaxial rank step holes, and the diameter in hole, right rank is greater than the diameter in hole, left rank, the right aperture in hole, right rank is conical surface, and valve seat side has the water inlet in radially equally distributed connection scala media hole; Described spool consists of tail end cylinder, conical section and the head end cylinder of one, tail end body diameter and the left rank of described valve seat bore dia match, conical section maximum radial diameter of section is greater than the diameter in hole, described right rank, the cone angle of conical section is less than the cone angle of the conical surface in Kong You aperture, the right rank of valve seat, spool has axial hole, the internal diameter of the corresponding tail end column part of axial hole increases, and damper is wherein installed; Hole, the left rank of spool tail end cylinder and valve seat is slidably matched, and the conical surface in Kong You aperture, the right rank of conical section and valve seat forms the valve port of cone valve structure; Valve seat and body cavity are slidably matched, and the water inlet of valve seat is positioned at valve body annular undercut groove relevant position;
Right end cap is connected with described body cavity right-hand member by screw thread, right end cap left end is shaped as drum, right end cap right-hand member is shaped as outer hexagonal prism body, and spring seat is embedded in right end cap inner chamber and is slidably matched with right end cap inner chamber, and spring is placed between spool head end cylinder and spring seat and both are spacing by rear; Adjusting screw rod and right end cap bottom surface screw-thread fit are also withstood described spring seat;
Described valve body left end sealing, the body cavity between described body cavity left end bottom surface and the left side of described valve seat forms damping cavity.
Described differential type water hydraulic relief valve, wherein:
Described damper is the cylindrical body with axial hole, and the aperture of axial hole is 0.6～1.6mm;
Described valve seat adopts titanium alloy, monel or Austenitic Stainless Steel to be processed into, and described spool adopts and is processed into through Martensitic Stain Less Steel or the Precipitation-hardening Stainless Steel of enhancement process.
When the present invention works, high pressure water enters from liquid entering hole, and when the differential hydraulic power on acting on spool is greater than the working pressure of spring setting, spool is opened, and water enters spring chamber through valve port, finally by liquid outlet, flows out.Spool under the effect of hydraulic coupling, spring force, frictional force in a certain equilibrium position.The pressure of liquid entering hole can move valve seat and spool by adjusting screw rod and cushion block, and then the pre compressed magnitude of Regulation spring is set.Spool is in Dynamic Regulating Process, polarization when spool tail end cylinder can suppress spool unlatching, the variation of damping cavity volume simultaneously changes the pressure that causes this chamber, thereby produce an additional forces with valve core movement opposite direction, increase the damping of valve core movement, improved the working stability of spool.Conical surface on spool and tail end cylinder respectively with valve seat on hole, Kong Hezuo rank, right rank form differential hydraulic pressure area, the suffered hydraulic action of spool in the time of can greatly reducing under high pressure to work, thus greatly reduce spring rate and spring force.
In order to reduce to leak, spool of the present invention and valve seat form the cone valve structure of good airproof performance, for reducing spool polarization, at spool tail end, are designed with tail end cylinder, and form matching gap with valve seat endoporus, to valve core movement, provide guiding.In order to improve the working stability of spool, in spool, be drilled with through hole and damper is installed; Cavity between cushion block, valve seat, spool forms damping cavity, and the pressure while utilizing valve core movement in damping cavity changes to increase the kinetic damping of spool.
For alleviating air pocket and reducing the harm of cavitation erosion, taked following measures: 1) spool and valve seat are all designed to cone structure at valve port place, and spool cone angle is slightly less than valve seat cone angle, be conducive to suppress air pocket; 2) valve seat and spool adopt a soft hard material pairing, valve seat adopts titanium alloy that hardness is lower, monel (as Monel etc.) or Austenitic Stainless Steel (as 1Cr18Ni9Ti) to be processed into, spool adopts Martensitic Stain Less Steel (being only applicable to fresh water or high water base) or the Precipitation-hardening Stainless Steel through enhancement process to be processed into, and is conducive to reduce the destruction of cavitation erosion.
For reducing spring rate, cylindrical body that the diameter of spool axially-aligned is different and cone and valve seat form differential valve port active area, under uniform pressure condition, the hydraulic action acting on spool greatly reduces, thereby can reduce spring rate, increase pressure regulation precision, facilitate manufacturing and designing of spring.
The present invention compares with similar overflow, leak little, cavitation resistive property good, it is little to vibrate, noise is low, pressure regulation precision is high, good operating stability, spring force required when high pressure is little, is applicable to using in seawater, fresh water, the high mesohigh water hydraulic system of making working medium such as water base as pressure controlled valve.
Accompanying drawing explanation
Fig. 1 is the structural representation of first embodiment of the invention;
Fig. 2 is the structural representation of second embodiment of the invention;
Fig. 3 is existing Danfoss One-stage Water Hydraulic Relief Valve structural representation.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described.
As shown in Figure 1, first embodiment of the present invention, comprises valve body 1, valve seat 2, spool 3, spring 5, spring seat 6 and adjusting screw rod, and valve seat 2, spool 3, spring 5 and spring seat 6 are housed in described valve body 1 from left to right successively;
Described valve body 1 inner chamber is circular port, and circular port middle part has annular undercut groove 1-1, and valve body side diverse location has respectively the liquid entering hole P that is communicated with described annular undercut groove 1-1 and the liquid outlet T of connecting valve intracoelomic cavity; Described valve seat 2 is shaped as cylinder, outside diameter of cylinder is mated with body cavity circular port internal diameter, valve base cavity is three coaxial rank step holes, the diameter of right rank hole 2-3 is greater than the diameter of left rank hole 2-2, the right aperture of right rank hole 2-3 is conical surface, and valve seat side has the water inlet 2-4 of 4 radially equally distributed connection scala media hole 2-1; Described spool 3 consists of tail end cylinder 3-1, conical section 3-2 and the head end cylinder 3-3 of one, tail end cylinder 3-1 diameter and hole, the left rank of described valve seat 2-2 diameter match, conical section 3-2 maximum radial diameter of section is greater than the diameter of described right rank hole 2-3, the cone angle of conical section is less than the cone angle of the conical surface in 2-3You aperture, hole, the right rank of valve seat, spool has axial hole 3-4, the internal diameter of the corresponding tail end column part of axial hole increases, and damper 4 is wherein installed; Spool 3 tail end cylinder 3-1 and the left rank of valve seat hole 2-2 are slidably matched, and the conical surface in 2-3You aperture, hole, the right rank of conical section 3-2 and valve seat forms the valve port of cone valve structure; Valve seat 2 is slidably matched with body cavity, and the water inlet 2-4 of valve seat is positioned at valve body annular undercut groove 1-1 relevant position;
The 1 right-hand member sealing of described valve body, spring seat 6 is embedded in the right bottom surface of body cavity, and spring 5 is placed between spool head end cylinder 3-3 and spring seat 6 and both are spacing by rear;
Described body cavity left end is built-in with the cylindrical cushion block 7 being slidably matched with body cavity, the left side of the described valve seat 2 of cylindrical cushion block 7 sealing, and the valve base cavity between cylindrical cushion block 7 and spool tail end cylinder 3-1 forms damping cavity 8;
Left end cap 9 is connected with described valve body left side by screw, and adjusting screw rod 10 and left end cap 9 screw-thread fit are also withstood described cylindrical cushion block 7.
Described damper 4 is for having the cylindrical body of axial hole, and the aperture of axial hole is 0.6mm;
Described valve seat adopts Austenitic Stainless Steel to be processed into, and described spool adopts Precipitation-hardening Stainless Steel to be processed into.
As shown in Figure 2, second embodiment of the present invention, comprises valve body 1, valve seat 2, spool 3, spring 5, spring seat 6 and adjusting screw rod, and valve seat 2, spool 3, spring 5 and spring seat 6 are housed in described valve body 1 from left to right successively;
Described valve body 1 inner chamber is circular port, and circular port middle part has annular undercut groove 1-1, and valve body side diverse location has respectively the liquid entering hole P that is communicated with described annular undercut groove 1-1 and the liquid outlet T of connecting valve intracoelomic cavity; Described valve seat 2 is shaped as cylinder, outside diameter of cylinder is mated with body cavity circular port internal diameter, valve base cavity is three coaxial rank step holes, the diameter of right rank hole 2-3 is greater than the diameter of left rank hole 2-2, the right aperture of right rank hole 2-3 is conical surface, and valve seat side has the water inlet 2-4 of 4 radially equally distributed connection scala media hole 2-1; Described spool 3 consists of tail end cylinder 3-1, conical section 3-2 and the head end cylinder 3-3 of one, tail end cylinder 3-1 diameter and hole, the left rank of described valve seat 2-2 diameter match, conical section 3-2 maximum radial diameter of section is greater than the diameter of described right rank hole 2-3, the cone angle of conical section is less than the cone angle of the conical surface in 2-3You aperture, hole, the right rank of valve seat, spool has axial hole 3-4, the internal diameter of the corresponding tail end column part of axial hole increases, and damper 4 is wherein installed; Spool 3 tail end cylinder 3-1 and the left rank of valve seat hole 2-2 are slidably matched, and the conical surface in 2-3You aperture, hole, the right rank of conical section 3-2 and valve seat forms the valve port of cone valve structure; Valve seat 2 is slidably matched with body cavity, and the water inlet 2-4 of valve seat is positioned at valve body annular undercut groove 1-1 relevant position;
Described valve body 1 left end sealing, the body cavity between described body cavity left end bottom surface and the left side of described valve seat 2 forms damping cavity 8.
Described damper 4 is for having the cylindrical body of axial hole, and the aperture of axial hole is 1.6mm;
Described valve seat adopts monel to be processed into, and described spool adopts and is processed into through the Martensitic Stain Less Steel of enhancement process.
Claims (4)
1. a differential type water hydraulic relief valve, comprise valve body (1), valve seat (2), spool (3), spring (5), spring seat (6) and adjusting screw rod (10), cylindrical cushion block (7), valve seat (2), spool (3), spring (5) and spring seat (6) are housed in described valve body (1) from left to right successively; It is characterized in that:
Described valve body (1) inner chamber is circular port, circular port middle part has annular undercut groove (1-1), and valve body side diverse location has respectively the liquid entering hole (P) that is communicated with described annular undercut groove (1-1) and the liquid outlet (T) of connecting valve intracoelomic cavity; Described valve seat (2) is shaped as cylinder, outside diameter of cylinder is mated with body cavity circular port internal diameter, valve base cavity is three coaxial rank step holes, the diameter in hole, right rank (2-3) is greater than the diameter in hole, left rank (2-2), the right aperture in hole, right rank is conical surface, and valve seat side has the water inlet (2-4) in radially equally distributed connection scala media hole (2-1); Described spool (3) consists of tail end cylinder (3-1), conical section (3-2) and the head end cylinder (3-3) of one, tail end cylinder (3-1) diameter and holes, the left rank of described valve seat (2-2) diameter match, conical section (3-2) maximum radial diameter of section is greater than the diameter in holes, described right rank (2-3), the cone angle of conical section is less than the cone angle of the conical surface in right aperture, holes, the right rank of valve seat (2-3), spool has axial hole (3-4), the internal diameter of the corresponding tail end column part of axial hole increases, and damper (4) is wherein installed; Spool (3) tail end cylinder (3-1) is slidably matched with holes, the left rank of valve seat (2-2), and the conical surface in the right aperture of conical section (3-2) and holes, the right rank of valve seat (2-3) forms the valve port of cone valve structure; Valve seat (2) is slidably matched with body cavity, and the water inlet of valve seat (2-4) is positioned at valve body annular undercut groove (1-1) relevant position;
Described valve body (1) right-hand member sealing, spring seat (6) is embedded in the right bottom surface of body cavity, and spring (5) is placed between spool head end cylinder (3-3) and spring seat (6) and both are spacing by rear;
Described body cavity left end is built-in with the cylindrical cushion block (7) being slidably matched with body cavity, cylindrical cushion block (7) seals the left side of described valve seat (2), and the valve base cavity between cylindrical cushion block (7) and spool tail end cylinder (3-1) forms damping cavity (8);
Left end cap (9) is connected with described valve body left side by screw, and adjusting screw rod (10) and left end cap (9) screw-thread fit are also withstood described cylindrical cushion block (7).
2. differential type water hydraulic relief valve as claimed in claim 1, is characterized in that:
Described damper (4) is for having the cylindrical body of axial hole, and the aperture of axial hole is 0.6～1.6mm;
Described valve seat adopts titanium alloy, monel or Austenitic Stainless Steel to be processed into, and described spool adopts and is processed into through Martensitic Stain Less Steel or the Precipitation-hardening Stainless Steel of enhancement process.
3. a differential type water hydraulic relief valve, comprise valve body (1), valve seat (2), spool (3), spring (5), spring seat (6) and adjusting screw rod (10), valve seat (2), spool (3), spring (5) and spring seat (6) are housed in described valve body (1) from left to right successively; It is characterized in that:
Described valve body (1) inner chamber is circular port, circular port middle part has annular undercut groove (1-1), and valve body side diverse location has respectively the liquid entering hole (P) that is communicated with described annular undercut groove (1-1) and the liquid outlet (T) of connecting valve intracoelomic cavity; Described valve seat (2) is shaped as cylinder, outside diameter of cylinder is mated with body cavity circular port internal diameter, valve base cavity is three coaxial rank step holes, the diameter in hole, right rank (2-3) is greater than the diameter in hole, left rank (2-2), the right aperture in hole, right rank (2-3) is conical surface, and valve seat side has the water inlet (2-4) in radially equally distributed connection scala media hole (2-1); Described spool (3) consists of tail end cylinder (3-1), conical section (3-2) and the head end cylinder (3-3) of one, tail end cylinder (3-1) diameter and holes, the left rank of described valve seat (2-2) diameter match, conical section (3-2) maximum radial diameter of section is greater than the diameter in holes, described right rank (2-3), the cone angle of conical section is less than the cone angle of the conical surface in right aperture, holes, the right rank of valve seat (2-3), spool has axial hole (3-4), the internal diameter of the corresponding tail end column part of axial hole increases, and damper (4) is wherein installed; Spool (3) tail end cylinder (3-1) is slidably matched with holes, the left rank of valve seat (2-2), and the conical surface in the right aperture of conical section (3-2) and holes, the right rank of valve seat (2-3) forms the valve port of cone valve structure; Valve seat (2) is slidably matched with body cavity, and the water inlet of valve seat (2-4) is positioned at valve body annular undercut groove (1-1) relevant position;
Right end cap (11) is connected with described body cavity right-hand member by screw thread, right end cap (11) left end is shaped as drum, right end cap (11) right-hand member be shaped as outer hexagonal prism body, spring seat (6) is embedded in right end cap inner chamber and is slidably matched with right end cap inner chamber, and spring (5) is placed between spool head end cylinder (3-3) and spring seat (6) and both are spacing by rear; Adjusting screw rod (10) and right end cap bottom surface screw-thread fit are also withstood described spring seat (6);
The sealing of described valve body (1) left end, the body cavity between described body cavity left end bottom surface and the left side of described valve seat (2) forms damping cavity (8).
4. differential type water hydraulic relief valve as claimed in claim 3, is characterized in that:
Described damper (4) is for having the cylindrical body of axial hole, and the aperture of axial hole is 0.6～1.6mm;
Described valve seat adopts titanium alloy, monel or Austenitic Stainless Steel to be processed into, and described spool adopts and is processed into through Martensitic Stain Less Steel or the Precipitation-hardening Stainless Steel of enhancement process.
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| CN201210398945.4A CN102943909B (en) | 2012-10-19 | 2012-10-19 | Differential type water hydraulic relief valve |
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| CN201210398945.4A CN102943909B (en) | 2012-10-19 | 2012-10-19 | Differential type water hydraulic relief valve |
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| CN102943909A CN102943909A (en) | 2013-02-27 |
| CN102943909B true CN102943909B (en) | 2014-04-09 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103925409B (en) * | 2014-04-02 | 2016-09-07 | 苏州沃特节水产品有限公司 | A kind of tank intake valve of water |
| CN105508674B (en) * | 2016-02-24 | 2017-11-03 | 湖北仁创科技有限公司 | A kind of slip damp type hydraulic overflow valve for high-pressure high-flow system |
| CN108131345B (en) * | 2017-12-21 | 2019-12-03 | 北京市捷瑞特弹性阻尼体技术研究中心 | A kind of high-damping direct-acting overflow valve |
| CN108167253A (en) * | 2017-12-27 | 2018-06-15 | 邵立坤 | Buffer overflow valve |
| CN108869761B (en) * | 2018-09-17 | 2024-03-15 | 东莞珀力伟动力科技有限公司 | Mute improved control valve of oil pump |
| CN114198563B (en) * | 2021-11-23 | 2024-01-19 | 河南航天液压气动技术有限公司 | Low-pressure high-flow direct-acting overflow valve |
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| CN2130987Y (en) * | 1992-06-30 | 1993-04-28 | 沈阳液压机厂 | Differential limit ultra-high-pressure overflow valve |
| US5447174A (en) * | 1993-08-02 | 1995-09-05 | Hydrolux S.A.R.L. | Pilot stage for pressure control valves |
| CN1619198A (en) * | 2004-04-21 | 2005-05-25 | 华中科技大学 | Leading type water pressure overflow valve |
| CN201909074U (en) * | 2010-12-10 | 2011-07-27 | 北京工业大学 | Direct-operated water pressure overflow valve with damping piston |
| CN201944356U (en) * | 2011-01-04 | 2011-08-24 | 句容市天龙机械制造厂 | Plunger type safety valve |
| CN102678987A (en) * | 2012-05-04 | 2012-09-19 | 华中科技大学 | Seawater hydraulic overflow valve |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5664856B2 (en) * | 2010-12-28 | 2015-02-04 | 株式会社不二越 | Relief valve |
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| CN2130987Y (en) * | 1992-06-30 | 1993-04-28 | 沈阳液压机厂 | Differential limit ultra-high-pressure overflow valve |
| US5447174A (en) * | 1993-08-02 | 1995-09-05 | Hydrolux S.A.R.L. | Pilot stage for pressure control valves |
| CN1619198A (en) * | 2004-04-21 | 2005-05-25 | 华中科技大学 | Leading type water pressure overflow valve |
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