CN102042432B - Direct-acting water pressure overflow valve with damping piston - Google Patents
Direct-acting water pressure overflow valve with damping piston Download PDFInfo
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- CN102042432B CN102042432B CN201010596962XA CN201010596962A CN102042432B CN 102042432 B CN102042432 B CN 102042432B CN 201010596962X A CN201010596962X A CN 201010596962XA CN 201010596962 A CN201010596962 A CN 201010596962A CN 102042432 B CN102042432 B CN 102042432B
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Abstract
The invention relates to a direct-acting water pressure overflow valve with a damping piston. The overflow valve comprises an end cover, as well as a valve seat, a valve core, a left spring seat, a guide sleeve, a spring, a right spring seat and a pressure regulating screw which are arranged in a valve body sequentially; an annular groove and a cross through hole are arranged in the valve seat, the valve core is arranged in an axial through hole of the valve seat, the end part of the valve core is provided with a countersunk groove, a cylindrical surface at the tail part of the valve core and the axial through hole of the valve seat form a guide surface, and cylindrical surface at the tail part of the valve core and a valve port formed by the valve seat form a cone valve structure; the valve core is in contact fit with the left spring seat; the left spring seat is guided by the inner bore of the guide sleeve, the guide sleeve is provided with a small through-flow hole, and the right side of the guide sleeve is provided with the annular groove; the spring is positioned between the left spring seat and the right spring seat; and the pressure regulating screw is connected with the valve body by screw threads. The overflow valve is suitable for a pressure control element in a medium and high-pressure water hydraulic system using seawater, fresh water, a high water base or the like as a working medium. Compared with similar valves, the overflow valve has the advantages of simple structure, convenience for processing, low leakage, small vibration, low noise, good cavitation corrosion resistance and high working stability.
Description
Technical field
The present invention relates to the pressure control valve in a kind of water hydraulic system; Be particularly related to a kind of direct-acting type water hydraulic relief valve with damping piston; Valve kind is suitable for seawater, fresh water, seawater base etc. as the pressure control valve in the mesohigh water hydraulic system of working medium.
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.Multipurpose oil is as working medium in hydraulic system, and when relief valve uses in water (comprising seawater, fresh water or high water base etc.) medium, can produce a series of technical problem.1. because the vapor pressure of water is higher than mineral oil far away, when water during in the valve port flow at high speed, the flow field local compression can be lower than the vapor pressure of water, and then produces cavitation phenomenon, makes the material at valve port place receive cavitation erosion, thereby reduces the functional reliability and the life-span of valve; 2. the viscosity owing to water is low, poor, and the leakage problem at the friction of spool and valve base chamber and valve port place is serious; 3. the density of water, Young's modulus are big than mineral oil, and " water attack " phenomenon is serious; 4. medium effluents and spring force departs from the radial force that reason such as spool axle center produces and makes the spool polarization in that valve port is inhomogeneous.5. the complex structure of water hydraulic relief valve, difficulty of processing increases, and cost of production is high.
The Central China University of Science and Technology has developed the straight ejector half relief valve of a kind of hydraulic pressure with the oil gas damping device; Add on this relief valve spool hydro-pneumatic spring is arranged; Form by air cavity, upper oil cavitie and lower oil cavitie; Fluid forms damping force through damping hole during valve core movement, and hydraulic oil can improve the lubricating condition of spool again simultaneously, and the motion of spool has leading role.But valve still has the existence of oil, is not the pure water medium, and the vibration of spool is more violent, and noise is very big; And this valve arrangement relative complex, processing cost is higher.
The direct-acting type water hydraulic relief valve rear end that Denmark Danfoss company produces is provided with damping cavity, has improved the working stability of valve to a certain extent.But valve is easy to polarization, and consequent vibration noise and working stability still exist.And the material that this valve adopts is not suitable for seawater, the not strong media of corrosivity such as only suitable fresh water and seawater base.
Summary of the invention
The present invention provides a kind of direct-acting type water hydraulic relief valve with damping piston, is used to solve the above-mentioned technical barrier that direct-acting overflow valve exists, and in the aqueous medium environment, works; Improve the working stability of valve; Reduce valve port leakage, cavitation erosion, vibration, noise, increase corrosion resistance, simultaneously simplified structure; Be easy to processing, save cost.
Technological scheme of the present invention is following:
A kind of direct-acting type water hydraulic relief valve of the present invention with damping piston, the valve seat, spool, left spring seat, guide sleeve, spring, right spring seat, the screw press that comprise end cap and in valve body, arrange successively; Radially have circular groove in the valve seat, and axially and radially have the criss-crossing through hole, be used to increase the flow area of water inlet, reduce the flow velocity and the noise of relief valve internal water, improve the reliability and the working life of relief valve work along it; Spool is arranged in the valve seat axial hole, and the spool end is provided with the countersunk head groove, and countersunk head groove and end cap form damping cavity, and the axial hole of spool afterbody cylndrical surface and valve seat forms guide surface, and forms cone valve structure with the formed valve port of valve seat place; Spool touches to cooperate with the left spring seated connection and transmits pressure adjusting spring power, and both surface of contact are sphere, can make spring force act on the spool equably; The left spring seat leads with the endoporus of guide sleeve, has through-flow aperture on the guide sleeve, and its right side has circular groove; Spring is between left and right spring seat; Screw press is threaded with valve body; End cap is connected through 4 bolts with valve body, and water intake adopts board-like the connection or the tubular type connection with other interelement of water outlet and hydraulic system on the valve body.
Wherein, spool has played the effect of damping piston.Have T type slightness hole in the said spool vertically and radially, and communicate with the countersunk head groove of its end.Be processing on the one hand for the ease of this elongated orifices; On the other hand, this countersunk head groove and end cap form damping cavity, and the damping cavity internal pressure changes the kinetic damping that increases spool when utilizing valve core movement; Improved the working stability of spool, so spool has played the effect of damping piston simultaneously; The tail end of spool is designed with the guide cylinder face simultaneously, and forms matching gap with the valve seat endoporus, to valve core movement guiding is provided, and can reduce spool polarization in the course of the work.
Said valve seat and spool contact opening place are the ring-shaped step hole, make valve seat and spool form two-step throttle valve port structure.Promptly be operated in higher following time of pressure state when this relief valve, the valve seat mouthful place that contacts with spool is designed to reprocess through hole behind the countersunk head groove, thereby make the structure of valve seat and valve core chamber formation two-step throttle mouth, can lower the harm of its cavitation erosion and leakage.
In addition, said spool tail end external cylindrical surface also can be and mills flat structure, makes the high pressure water of inlet can act on piston base thus.Promptly need not again along its radial and axial T of opening type through hole.When the cone valve closure or openness, play damping function on the one hand, be used for improving the stability of cone valve; Be used on the other hand guaranteeing can not tilting after cone valve is opened, to improve the static characteristic of cone valve.
Said valve seat and spool adopt soft hard material pairing, and wherein valve seat adopts lower aluminum bronze or the engineering plastics of hardness, and spool adopts the stainless steel material through enhancement process.
Described valve body upper outlet place has circular groove, and the flow area at the place that can effectively increase export reduces exit velocity, improves working life.
A kind of direct-acting type water hydraulic relief valve with damping piston of the present invention is compared with other the straight structure of moving relief valve, and the present invention is simple in structure, is easy to processing, saves cost.
Description of drawings
Fig. 1 is a kind of direct-acting type water hydraulic relief valve structural drawing with damping piston of the present invention.
Fig. 2 is the embodiment of valve seat of the present invention and spool two-step throttle valve port.
Fig. 3 plays the another kind of embodiment structural drawing of damping piston effect for spool of the present invention.
Fig. 4 is an A-A sectional drawing among Fig. 3.
Among the figure: 1, end cap, 2, valve seat, 3, spool (damping piston), 4, the left spring seat, 5, guide sleeve, 6, valve body, 7, spring, 8, right spring seat, 9, screw press, P, water intake, O, water outlet.
Embodiment
Below in conjunction with accompanying drawing 1-4, the present invention is further specified through embodiment.
As shown in Figure 1, valve seat 2, spool 3, left spring seat 4, guide sleeve 5, spring 7, right spring seat 8, screw press 9 that this relief valve comprises end cap 1 and in valve body 6, arranges successively; Radially have circular groove in the valve seat 2; And axially and radially have the criss-crossing through hole along it, and have T type slightness hole in the spool 3 vertically and radially, communicate with the countersunk head groove of its end; Countersunk head groove and end cap 1 form damping cavity; Spool 3 is in valve seat 2, and the axial hole of its afterbody cylndrical surface and valve seat 2 forms guide surface, and 2 formed valve port places are cone valve structures with valve seat; Spool 3 transmits pressure adjusting spring power with left spring seat 4 contact matching, and both surface of contact are sphere; Left spring seat 4 leads with the endoporus of guide sleeve 5, has through-flow aperture on the guide sleeve 5, and its right side has circular groove; Screw press 9 is threaded with valve body 6, and relief valve is imported and exported can adopt board-like connection or tubular type linkage structure.
During installation, pack into earlier in the valve body 6 right spring seat 8, spring 7, left spring seat 4 guarantee that spring 7 is between the spring seat of the left and right sides; Guide sleeve 5 leans on valve body 6 interior step location, and passes left spring seat 4, and spool 3 is inserted valve seat 2 endoporus; Then both are packed in the valve body 6 together; Through bolt end cap 1 is installed on valve body 6 end faces again, makes valve seat 2 end compressing guide sleeve 5 at last screw press 9 to be screwed into valve body 6 from right-hand member.Have the installation tapped hole on the bottom surface of valve body 6, be convenient to other element of relief valve and hydraulic system is connected.
During work, high pressure water enters into the circular groove and the criss-crossing through hole of valve seat 2 from water intake P, and the slightness hole through spool 3 flows to end countersunk head groove more afterwards; Fluid pressure acts on the spool 3 through the countersunk head groove; When working pressure that hydraulic coupling is set greater than pressure adjusting spring 7, spool 3 is opened, and water flows out through valve port; Through-flow aperture through guide sleeve 5 flows to spring chamber again, flows out from water outlet O at last.The pressure of water intake P can be set through the pre compressed magnitude that changes pressure adjusting spring 7.In the adjustment process of spool 3; Polarization when the guide surface of valve seat 2 can suppress the spool unlatching; And the guide surface of guide sleeve 5 can release spring off-centre take place; The variation that countersunk head groove on the while spool 3 and elongated orifices can reduce pressure, the damping function when improving valve core movement, and then improved the working life of valve seat and the working stability of spool.
Accompanying drawing 3-4 is the another kind of embodiment that spool of the present invention plays the damping piston effect.Promptly need not again along its radial and axial T of opening type through hole, and the tail end outer cylinder facing cut of spool 3 is flat, make the high pressure water of water inlet directly get into from here and act on piston base.When the cone valve closure or openness, play damping function on the one hand, be used for improving the stability of cone valve; Be used on the other hand guaranteeing can not tilting after cone valve is opened, to improve the static characteristic of cone valve.
Claims (6)
1. direct-acting type water hydraulic relief valve with damping piston, the valve seat (2), spool (3), left spring seat (4), guide sleeve (5), spring (7), right spring seat (8), the screw press (9) that comprise end cap (1) and in valve body (6), arrange successively; Valve seat radially has circular groove in (2); And axially and radially have the criss-crossing through hole along it; Spool (3) is arranged in valve seat (2) axial hole, and spool (3) end is provided with the countersunk head groove, and countersunk head groove and end cap (1) form damping cavity; The axial hole of spool (3) afterbody cylndrical surface and valve seat (2) forms guide surface, and forms cone valve structure with the formed valve port of valve seat (2) place; Spool (3) transmits pressure adjusting spring power with left spring seat (4) contact matching, and both surface of contact are sphere; Left spring seat (4) leads with the endoporus of guide sleeve (5), and guide sleeve has through-flow aperture on (5), and the right side of guide sleeve has circular groove; Spring (7) is between left and right spring seat; Screw press (9) is threaded with valve body (6); Valve body (6) is provided with water intake (P) and water outlet (O), and said water intake (P) is connected with circular groove and said criss-crossing through hole that said valve seat radially has, and said water outlet (O) is connected with interior spring chamber and the said through-flow aperture of valve body (6).
2. a kind of direct-acting type water hydraulic relief valve with damping piston as claimed in claim 1 is characterized in that: have T type slightness hole in the spool (3) vertically and radially, and communicate with the countersunk head groove of its end.
3. a kind of direct-acting type water hydraulic relief valve with damping piston as claimed in claim 1 is characterized in that: valve seat (2) is the ring-shaped step hole with spool (3) contact opening place, makes valve seat (2) and spool (3) form two-step throttle valve port structure.
4. a kind of direct-acting type water hydraulic relief valve with damping piston as claimed in claim 1 is characterized in that: spool (3) tail end external cylindrical surface makes the high pressure water of inlet can act on the end that spool is provided with the countersunk head groove thus for milling flat structure.
5. like each described a kind of direct-acting type water hydraulic relief valve among the claim 1-4 with damping piston; It is characterized in that: end cap (1) is connected through 4 bolts with valve body (6), and valve body (6) is gone up water intake (P) and adopted board-like the connection or the tubular type connection with water outlet (O) and other interelement of hydraulic system.
6. like each described a kind of direct-acting type water hydraulic relief valve among the claim 1-4 with damping piston; It is characterized in that: valve seat (2) and spool (3) adopt soft-hard material pairing; Wherein valve seat adopts lower aluminum bronze or the engineering plastics of hardness, and spool adopts the stainless steel material through enhancement process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010596962XA CN102042432B (en) | 2010-12-10 | 2010-12-10 | Direct-acting water pressure overflow valve with damping piston |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010596962XA CN102042432B (en) | 2010-12-10 | 2010-12-10 | Direct-acting water pressure overflow valve with damping piston |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102042432A CN102042432A (en) | 2011-05-04 |
| CN102042432B true CN102042432B (en) | 2012-05-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201010596962XA Expired - Fee Related CN102042432B (en) | 2010-12-10 | 2010-12-10 | Direct-acting water pressure overflow valve with damping piston |
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- 2010-12-10 CN CN201010596962XA patent/CN102042432B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU870828A1 (en) * | 1978-10-19 | 1981-10-07 | Ордена Трудового Красного Знамени Экспериментальный Научно-Исследовательский Институт Металлорежущих Станков | Pressure governer valve |
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| CN102042432A (en) | 2011-05-04 |
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