CN104864137B - Leading type water pressure overflow valve - Google Patents
Leading type water pressure overflow valve Download PDFInfo
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- CN104864137B CN104864137B CN201510259603.8A CN201510259603A CN104864137B CN 104864137 B CN104864137 B CN 104864137B CN 201510259603 A CN201510259603 A CN 201510259603A CN 104864137 B CN104864137 B CN 104864137B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
- F16K17/10—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with auxiliary valve for fluid operation of the main valve
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- General Engineering & Computer Science (AREA)
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- Safety Valves (AREA)
Abstract
The present invention relates to a kind of leading type water pressure overflow valve, including main valve and pilot valve, main valve includes main valve body, main valve housing, main valve plug, and pilot valve includes pilot valve body, guide's valve base, pilot valve core, pilot valve pressure spring；Main valve plug is sliding valve structure, and its end parabolically shape and offers throttling channel, is provided with four conduction holes from the inner wall surface opens outward of throttling channel, micro- shape hole is uniformly offered on the external cylindrical surface for the main valve plug being engaged with main valve housing；Pilot valve core is cone valve structure, ring-shaped step hole is offered at the cone angle of the interior bore ends of guide's valve base, pilot valve core is provided with a guide piston, and guide piston collectively forms a pressure regulating cavity with the guide cylinder on pressure regulation spiral shell handle, the spool bore in pilot valve body；Annular groove is offered on the end face of guide piston.Cavitation erosion, vibration and noise can be reduced, improves the hydrodynamic lubrication performance of main valve plug, wire drawing is reduced and corrodes.
Description
Technical field
The present invention relates to technical field of valve manufacturing, in particular to it is a kind of be applied to using seawater, fresh water, it is high it is water base etc. as
Overflow valve in the mesohigh water hydraulic system of working media, more particularly to a kind of leading type water pressure overflow valve.
Background technology
Water hydraulics is the new skill using natural fresh water, seawater or running water proxy mineral oil as hydraulic work system medium
Art, as hydraulic technology, belong to hydraulic transmission technology.In the development process of hydraulic transmission technology, water passes as power
The media passed, exchange and controlled once played very important effect.In shortage of resources and environmentally friendly today is advocated, using water conduct
The working media of hydraulic transmission technology mainly has following advantage：1st, ecology is friendly, environment friendly and pollution-free；2nd, clean and safe, can
Avoid fire；3rd, it is cheap, wide material sources；4th, easy to maintain and maintenance.But work as by the use of aqueous medium proxy mineral oil and be used as work
When making medium, with traditional oils pressurized overflow valve design theory design water hydraulic relief valve meeting and hydraulic system between occur it is uncoordinated,
Cause the even whole hydraulic work system of valve unstable.
When overflow valve in aqueous medium in use, a series of technical problem can be produced, mainly have：
1st, cavitation erosion and cavitation wear：Because the pressure for vaporization of aqueous medium is high, the flow velocity at restriction is also very high, so pure
It is easy to produce cavitation erosion in water hydraulic choke valve, the destruction to material surface of cavitating is mainly caused pressure after bubble collapse
Reeb produces very strong percussion to piece surface, compared with mineral oil, water in compression shock caused by bubbles burst more
Greatly, destructive power is stronger；
2nd, wire drawing erosion and erosion：Because the viscosity of water is low, poor lubricity, the velocity ratio oil pressure of valve port under the same conditions
Valve is high, even more so under small guide vane, big differential pressure conditions, can produce serious souring to valve element and valve seat, while water is situated between
Fine particle in matter is carry the surface for rushing at part by high-velocity flow, scrapes a rule vestige；
3rd, leakage rate is big：Because the viscosity of aqueous medium is about the 1/30-1/40 of oil, thus in identical area of passage and
Amount of leakage under differential pressure action than oil is big, causes system volume efficiency to decline；
4th, compression shock, vibration and noise：Because the modulus of elasticity of aqueous medium is about 1.5-2.4 times of hydraulic oil, water
The middle velocity of sound is higher by about 10% than in hydraulic oil, therefore the compressibility of water is small, rigidity is big, transmission speed of the pressure surge in water is fast
And it is slow to decay, violent vibration and noise, i.e. water hammer are produced.
To reduce the vibration of overflow valve, noise, it is usually taken and reduces cone valve semi-cone angle；Damping is provided with pilot valve
Hole；Add weakening pad to change this cavity volume flow velocity field distribution in pilot valve chamber, or eliminated using the miniature absorbing principle of weakening plug
Scream and vibrate；Add guide piston in pilot valve front end, overcome the beat of poppet valve core.It is according to Chinese Patent Application No.
200410013070.7 " leading type water pressure overflow valves " announced, mainly include main valve and pilot valve, are primarily characterized in that：
There is guide cylinder face, it forms fit clearance between the endoporus of pilot valve body, makes pressure spring chamber on pilot valve core
As damping cavity；The porch of main valve body before main valve seat, it is provided with restrictor ring, its radial direction has the different throttling of multiple diameters
Hole.The valve can reduce primary valve operting differential pressure, the resistance widening range of regulation, reduce the lateral runout of pilot valve, increasing pilot valve
Buddhist nun, cavitation resistive property is good, noise is low, good operating stability.But this overflow valve can not reduce the abrasion at main valve plug position,
The damping cavity formed in pilot valve, when aqueous medium is acted on guide cylinder end face, a fluid stream line style shakiness is easily caused, produces punching
Hit noise.
The content of the invention
The present invention is in order to overcome deficiency of the prior art, there is provided a kind of leading type water pressure overflow valve, suitable for middle height
Water hydraulic system is pressed, cavitation damage can be reduced, vibration is reduced, noise, improves the hydrodynamic lubrication between main valve plug and main valve housing
Performance, the impurity in aqueous medium is stored, reduce wire drawing and corrode.
The present invention is to be achieved through the following technical solutions：
A kind of leading type water pressure overflow valve, including main valve and pilot valve two parts, the main valve include main valve body, main valve
Set, main valve plug, main valve housing are arranged in the hole of main valve body, and main valve plug is arranged in main valve housing, is installed in the spring cavity of main valve plug
There is main valve back-moving spring；The pilot valve includes pilot valve body, guide's valve base, pilot valve core, pilot valve pressure spring,
Guide's valve base and pilot valve core are installed in pilot valve body；The main valve plug is sliding valve structure, main valve plug
End parabolically shape, throttling channel is offered in its end in the axial direction, and the throttling channel is made up of cylindrical section and conical section, from
The cylindrical section inner wall surface of throttling channel outwards radially offers four conduction holes, in the main valve plug being engaged with main valve housing
Micro- shape hole is uniformly offered on external cylindrical surface；The pilot valve core is cone valve structure, the cone of the interior bore ends of guide's valve base
Ring-shaped step hole is offered at angle so that guide's valve base forms the valve mouth structure with two-step throttle, institute with pilot valve core
State pilot valve core and be provided with a guide piston, guide piston and the guide cylinder on pressure regulation spiral shell handle, pilot valve body
In spool bore collectively form a pressure regulating cavity；The guide piston is straight towards offering two on a side end face of pilot valve core
The different annular concentric groove in footpath, the section semicircular in shape of annular groove.
As the preferred technical solution of the present invention, water inlet, delivery port and remote control mouth are offered on the main valve body, from entering
On the one hand aqueous medium that the mouth of a river flows into acts on the lower end of main valve plug, on the other hand hinder hole, vertical through the horizontal liquid on main valve body
Liquid resistance hole communicates with the ante-chamber of pilot valve body, is hindered through the fixer on pilot valve body into the spring cavity of main valve plug, in master
Runner is offered on valve body and pilot valve body to communicate with delivery port；Water inlet and delivery port and the other members of hydraulic system on valve body
Using board-like connection or tubular type connection between part.
As the preferred technical solution of the present invention, the main valve body and pilot valve body are made of austenitic stainless steel,
Surface carries out anodization；Main valve plug and pilot valve core are using metal as base material, surface spraying zirconia ceramics.
Its operation principle is：
At work, water inlet is connected on the outlet of hydraulic pump to pilot operated compound relief valve, and delivery port is connected with water tank.
1), remote control mouth K and outside situation about being not communicated with first are discussed：Aqueous medium from water inlet enter, by horizontal liquid hinder hole,
Vertical liquid resistance hole reaches the ante-chamber of pilot valve, by the damping hole among damping sleeve, acts on the conical surface of pilot valve core.When
When the inlet pressure of water inlet is relatively low, the pressure of aqueous medium can not overcome the spring force of pilot valve pressure spring, pilot valve core
Close, because the aqueous medium in valve is inactive liquid, the epicoele of main valve plug and lower cavity pressure are equal, and now, main valve plug is softer
Main valve back-moving spring in the presence of be in main valve housing bore position, primary valve closing, water inlet is obstructed with delivery port, no liquid stream
Pass through.When the inlet pressure of water inlet is higher, the hydraulic coupling acted on pilot valve core is equal to pilot valve pressure spring
During spring force, pilot valve core leaves guide's valve base, opens valve port, then valve port of the aqueous medium in valve through pilot valve and
Runner returns to the delivery port of main valve, overflows to water tank；The aqueous medium of main intake valve then hinders hole, vertical liquid resistance hole through horizontal liquid and mended
The valve port of pilot valve is charged to, because aqueous medium when horizontal liquid resistance hole and vertical liquid resistance hole by having local pressure loss, therefore first
The inlet pressure of pilot valve is less than main valve inlet pressure, i.e. the pressure of main valve plug epicoele is less than lower cavity pressure, main valve plug in epicoele and
Overcome the spring force of main valve back-moving spring to move up in the presence of cavity of resorption pressure differential, open primary valve, the water of main valve inlet is situated between
Matter overflows to water tank by primary valve.
2), the situation when the remote control mouth on main valve body is directly connected on water tank：Then pilot valve ante-chamber and main valve plug epicoele
Pressure be approximately equal to zero, now pilot valve valve port is closed, and the cavity of resorption of main valve plug only needs very low pressure just to overcome master
The spring force of valve back-moving spring opens valve port so that water inlet and delivery port communicate, and the aqueous medium of hydraulic pump output all flows back
Into water tank.
3), the situation when the remote control mouth on main valve body connects remote pressure regulating valve：At this moment remote pressure regulating valve just instead of originally
Pilot valve work, adjust the spring force of remote pressure regulating valve, it is possible to adjust the work of the main valve in the leading type water pressure overflow valve
Make pressure.The regulation pressure of remote pressure regulating valve is necessarily less than the set pressure of the pilot valve of leading type water pressure overflow valve, otherwise far
Journey pressure regulator valve will not work.
Compared with prior art, the beneficial effects of the invention are as follows：
1st, can be the cavitation shock of concentration from main valve valve port by the way that the front end of main valve plug is being processed into parabolic shape
Place extends back away, improves the anti-cavitation ability of main valve plug；By being machined with throttling channel on main valve plug, be advantageous to improve water
The rigidity of rate-of flow characteristic so that hydraulic radial power is balanced, suitable for mesohigh hydraulic system；By in main valve plug
On be machined with conduction hole, it is possible to increase the pressure at Main valve outlet, reduce main valve inlet and outlet pressure difference, suppress cavitation erosion, reduce make an uproar
Sound；By being machined with micro- shape hole on main valve plug, improve the hydrodynamic lubrication effect of main valve plug and impurity can be stored, reduce and draw
Silk corrodes；
2nd, the valve mouth structure of two-step throttle is formed between guide's valve base and pilot valve core, is opened in pilot valve core
When, every grade of valve port has been borne by pressure difference, can reduce cavitation erosion；
3rd, by being provided with guide piston and guide cylinder, a pressure regulating cavity is collectively constituted, on the one hand, pilot valve core and elder generation
Guiding mating surface between pilot valve valve body can reduce pilot valve core because being polarized caused by by uneven radial load, on the other hand,
When pilot valve core moves, the pressure change in pressure regulating cavity increases the kinetic damping of valve element, so as to improve the work of pilot valve
Stability；By offering annular groove on guide piston, the hydraulic power of pilot valve core is can compensate for, simultaneously because liquid stream side
To change, produce one and the jet flow force of pilot valve pressure spring spring force opposite direction, raising pilot valve core stroke
Stability.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the upward view in Fig. 1；
Fig. 3 is the A portions enlarged drawing in Fig. 1；
Fig. 4 is the axonometric drawing of guide piston in the present invention；
Fig. 5 is the sectional view of guide piston in the present invention；
Fig. 6 is the use state figure that mouth water receiving case is remotely controlled in the present invention；
Fig. 7 is the use state figure that remote control mouth connects remote pressure regulating valve in the present invention.
In figure：1- main valve bodies；2- main valve housings；3- main valve plugs；4- main valve back-moving springs；5- pilot valve bodies；6- pilot valves
Valve seat；7- pilot valve cores；8- pilot valve pressure springs；9- throttling channels；10- conduction holes；The micro- shape holes of 11-；12- stepped holes；13-
Guide piston；14- guide cylinders；15- pressure regulation spiral shell handles；16- pressure regulating cavities；17- annular grooves；18- spring cavitys；19- main spool spring seats；
20- radial direction through hole；21- guide's valve spring retainer；22- damping sleeves；The horizontal liquid resistance holes of a-；The vertical liquid resistance holes of b-；C- fixers hinder；d-
Runner；P- water inlets；T- delivery ports；K- is remotely controlled mouth；Y- remote pressure regulating valves.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
As shown in figure 1, leading type water pressure overflow valve provided by the invention is using two level concentric structure, it is concentric with three-level
Structure is compared, and the valve port area gradient of the pilot operated compound relief valve of two level concentric structure is more than three-level concentric structure, is active in one's movements.
The leading type water pressure overflow valve includes main valve and pilot valve two parts, the axial line of main valve and the axial line of pilot valve
It is mutually perpendicular to.
As shown in Figure 1 and Figure 2, main valve includes main valve body 1, main valve housing 2, main valve plug 3, and main valve housing 2 is arranged on main valve body 1
Kong Zhong, main valve plug 3 are arranged in main valve housing 2；Main valve back-moving spring 4 is installed, main valve resets bullet in the spring cavity 18 of main valve plug 3
The end contact of spring 4 is on the lower surface of spring cavity 18, and on main spool spring seat 19, and main valve back-moving spring 4 is from firm
Spend less helical spring.Radial direction through hole 20 is offered on main valve housing 2, it is close by rectangle between main valve housing 2 and main valve body 1
Seal and elliptical seal ring are sealed, and sealing ring is made of nitrile rubber, it have extremely low coefficient of friction and
Good self-lubricating property, service life length, sound state good sealing effect.
As shown in figure 1, main valve plug 3 is processed into parabolic shape, adopted using sliding valve structure, the end of main valve plug 3
With the main valve plug 3 of this shape, the cavitation shock of concentration can be extended back away at main valve valve port, this causes cavitation erosion to produce
Raw position and damaged location are inconsistent, protect main valve valve port, improve the anti-cavitation ability of main valve plug 3.
Throttling channel 9 is offered along its direction of axis line in the end of main valve plug 3, the throttling channel 9 is by cylindrical section and conical section
Composition, the throttling channel area of passage rate of change of cylindrical section is constant, is advantageous to improve the rigidity of aqueous medium discharge characteristic, circular cone
The throttling channel of section enables to hydraulic radial power to be balanced, suitable for mesohigh hydraulic system.From the cylindrical section of throttling channel 9
Inner wall surface outwards radially offers four conduction holes 10, it is possible to increase the pressure at Main valve outlet, reduces main valve disengaging
The pressure difference of mouth, effectively suppress cavitation erosion, reduce vibration and noise.
As shown in figure 1, friction pair is formed between the inner surface of main valve housing 2 and the cylindrical outer surface of main valve plug 3, according to wedge
Shape dynamic pressure is theoretical：Viscous fluid (in the present embodiment using water) is as the motion of friction pair is brought into and is full of with wedge
Between the surface of friction pair in shape gap, hydrodynamic pressure is produced to balance external applied load, reaches good lubrication purpose.By
Micro- shape hole 11 is uniformly offered on the external cylindrical surface of main valve plug 3, it is possible to increase the hydrodynamic lubrication performance of main valve plug 3, according to
Fluent software emulations understand that the pressure distribution curve on the surface of the main valve plug 3 with micro- shape hole 11 is similar to sine curve, and
Zone of positive pressure area and negative pressuren zone area are of substantially equal.With the increase of micro- depth of shape hole 11, then the bearing capacity of main valve plug 3 first increases
It is gradually reduced again, optimal span is present, when depth is between 3 μm -4 μm, pressure value is of a relatively high, hydrodynamic lubrication
Effect is preferable；With the increase of micro- radius of shape hole 11, the bearing capacity of main valve plug 3 also increases, and optimal span be present, when half
When footpath is between 25 μm -45 μm, hydrodynamic lubrication effect is preferable.Micro- shape hole 11 can be used as nail collection slot simultaneously, accommodate because main
The impurity particle carried in abrasive dust caused by boundary lubrication or dry friction between valve pocket 2 and main valve plug 3 and aqueous medium, so as to
Abrasion is reduced, extends the service life of main valve plug 3.
In the present embodiment, micro- shape hole 11 is formed using Laser Processing, and the power density of laser beam is high, gathers through optical system
Jiao, the minimum hot spot of micron dimension can be formed on the surface of main valve plug 3, belongs to noncontact procession, process velocity is fast, efficiency
Quickly, heat affected area is small for height, noiseless, while moving speed of laser beam, thermal deformation very little.
As shown in figure 1, pilot valve includes pilot valve body 5, guide's valve base 6, pilot valve core 7, pilot valve pressure regulation bullet
Spring 8, guide's valve base 6 and pilot valve core 7 are installed in pilot valve body 5.
As shown in Figure 1 and Figure 2, pilot valve core 7 depends on pilot valve core 7 and guide using cone valve structure, cone valve structure
The conical surface of valve base 6 is sealed, and sealing force increases with increasing for pressure, good sealing effect, easily obtains higher regulation
Pressure, reduce the fit tolerance between moving component, realize zero leakage；Cone valve type structure compares the adaptability of aqueous medium simultaneously
It is good, the abrasion of pilot valve core 7 can be compensated automatically.But the valve element of cone valve type structure both does and axially shaken in motion process
It is dynamic, do and radially wobble again, two kinds of motions all produce noise, therefore a guide piston 13 is provided with pilot valve core 7, are oriented to and live
Plug 13 collectively forms a pressure regulating cavity 16 with the guide cylinder 14 on pressure regulation spiral shell handle 15, the spool bore in pilot valve body 5,
It is that gap coordinates installation between guide piston 13, guide cylinder 14 and the spool bore of pilot valve.By being provided with guide piston
13, radially wobbling for pilot valve core 7 can be overcome.When pilot valve core 7 is being opened, pilot valve core 7 produces movement, adjusts
Press the volume of chamber 16 to reduce, pressure rise, now, pressure regulating cavity 16 produce one it is opposite with the direction of motion of pilot valve core 7 attached
Add active force, so as to add the kinetic damping of pilot valve core 7, improve stroke stability, prevent pilot valve core 7 from shaking
It is dynamic, reduce noise.
Pressure regulation spiral shell handle 15 is arranged in pilot valve body 5, passes through rectangle between pilot valve body 5 and pressure regulation the spiral shell handle 15
Sealing ring is sealed.Guide's valve spring retainer 21 is installed in the end of pressure regulation spiral shell handle 15, pilot valve pressure spring 8 is installed formerly
On pilot valve spring base 21, the helical spring larger from rigidity of pilot valve pressure spring 8, be capable of slowing down vibration frequency and
Amplitude, reduce noise.
As shown in figure 1, formerly the front end of pilot valve seat 6 is provided with damping sleeve 22, along the centerline direction of damping sleeve 22
Offer damping hole.
As shown in Figure 1, Figure 4, Figure 5, two are offered on a side end face of the guide piston 13 towards pilot valve core 7 directly
The different annular concentric groove 17 in footpath, the section semicircular in shape of annular groove 17, one end of guide piston 13 carry out chamfer machining processing.
By setting annular groove 17 to change the direction of liquid stream, on the one hand to compensate the hydraulic power of pilot valve core 7, on the other hand
Due to the change of liquid flow path direction, a jet flow force with the spring force opposite direction of pilot valve pressure spring 8 is produced.
As shown in Figure 1, Figure 3, in pilot valve, the appropriate semi-cone angle θ for reducing pilot valve core 7, pilot valve can be reduced
Hydraulic power rigidity, improve the stability of valve, while the support reaction that pilot valve core 7 contacts with guide's valve base 6 can be increased,
Improve sealing property.But the semi-cone angle θ of pilot valve core 7 acquirements are too small, can cause pilot valve core 7 and guide's valve base 6
The support reaction of contact is excessive, influences the overflow performance of valve.In the present embodiment, the semi-cone angle θ of pilot valve core 7 takes 20 °.
As shown in Figure 1, Figure 3, ring-shaped step hole 12 is offered at the cone angle of the interior bore ends of guide's valve base 6 so that first
Pilot valve seat 6 forms the valve mouth structure with two-step throttle, when pilot valve core 7 is opened, every grade of valve port with pilot valve core 7
Pressure difference has been borne by, cavitation erosion can be reduced.
As shown in Figure 1 and Figure 2, water inlet P, delivery port T and remote control mouth K are offered on main valve body 1, in water inlet P and is gone out
In mouth of a river T runner, bending part uses arc transition, when aqueous medium impacts circular arc bending part, enables to impact
Splash offsets part energy, flow velocity is tended to be uniform as early as possible.On the one hand the aqueous medium flowed into from water inlet P acts on main valve plug
3 lower end, on the other hand communicated through the horizontal liquid resistance hole a on main valve body 1, vertical liquid resistance hole b with the ante-chamber of pilot valve body 5,
C is hindered into the spring cavity 18 of main valve plug 3 through the fixer on pilot valve body 5, is opened up on main valve body 1 and pilot valve body 5
There is runner d to lead to delivery port T-phase.
Simultaneously because the hardness of material is to influence the principal element of cavitation erosion, the anti-cavitation ability of valve element is with material
The raising of hardness and improve, the fatigue strength of cavitation erosion and material also has relation, because the bubble being continuously generated can not
The disconnected impact that repeatability is produced to valve element and valve seat.The hardness of material, which is corroded wire drawing, to have a great impact, and material hardness is higher,
Tension silk corrodes and the ability of erosion is stronger.Therefore, in the present embodiment：
Main valve body 1 and pilot valve body 5 are made of austenitic stainless steel (1Cr18Ni9Ti), and surface is carried out at anodization
Reason (is handled) according to being actually needed using soft or hard anodized, can effectively prevent the corrosion of aqueous medium, and carry out at quenching
Reason so that the hardness of main valve body 1 and pilot valve body 5 reaches HRC33-40；
Main valve housing 2 and guide's valve base 6 are made of acid bronze alloy, form oxide-film by acid bronze alloy to reduce gas
Erosion；
Main valve plug 3 and pilot valve core 7 are using metal as base material, surface spraying zirconia ceramics, due to remaining metal
The high rigidity and excellent wear-resistant corrosion resistance of obdurability and ceramics, and the fragility of zirconia ceramics is overcome, while ceramics
Vibration absorbing performance is good, be advantageous to abatement cavitation erosion caused by shock wave, reduce the vibration of system.
As shown in fig. 6, when the remote control mouth K on main valve body 1 is directly connected on water tank, now pilot valve ante-chamber and main valve plug
The pressure of epicoele is approximately equal to zero, and now pilot valve valve port is closed, the cavity of resorption of main valve plug only need very low pressure just can gram
The spring force for taking main valve back-moving spring opens valve port so that water inlet P and delivery port T-phase are led to, and the aqueous medium of hydraulic pump output is complete
Portion is back in water tank.
As shown in fig. 7, the situation when the remote control mouth K on main valve body 1 meets remote pressure regulating valve Y：At this moment remote pressure regulating valve Y is just
It instead of original pilot valve work, regulation remote pressure regulating valve Y spring force, it is possible to adjust in the leading type water pressure overflow valve
Main valve operating pressure.The regulation pressure of remote pressure regulating valve is necessarily less than the setting pressure of the pilot valve of leading type water pressure overflow valve
Power, otherwise remote pressure regulating valve will not work.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement made within refreshing and principle etc., should be included in the scope of the protection.
Claims (3)
1. a kind of leading type water pressure overflow valve, including main valve and pilot valve two parts, the main valve includes main valve body (1), main valve
(2), main valve plug (3) are covered, main valve housing (2) is arranged in the hole of main valve body (1), and main valve plug (3) is arranged in main valve housing (2), main
Main valve back-moving spring (4) is installed in the spring cavity (18) of valve element (3)；The pilot valve includes pilot valve body (5), pilot valve
Valve seat (6), pilot valve core (7), pilot valve pressure spring (8), guide's valve base (6) and pilot valve core (7) are pacified
In pilot valve body (5)；It is characterized in that：
The main valve plug (3) is sliding valve structure, the end of main valve plug (3) parabolically shape, is opened up in the axial direction in its end
There is throttling channel (9), the throttling channel (9) is made up of cylindrical section and conical section, from the cylindrical section inner wall surface of throttling channel (9) to outer
Its radial direction offers four conduction holes (10), is uniformly opened up on the external cylindrical surface for the main valve plug (3) being engaged with main valve housing (2)
There is micro- shape hole (11)；
The pilot valve core (7) is cone valve structure, and ring-shaped step is offered at the cone angle of the interior bore ends of guide's valve base (6)
Hole (12) so that guide's valve base (6) forms the valve mouth structure with two-step throttle, the pilot valve with pilot valve core (7)
Valve element (7) is provided with a guide piston (13), guide piston (13) and the guide cylinder (14) on pressure regulation spiral shell handle (15),
Spool bore in pilot valve body (5) collectively forms a pressure regulating cavity (16)；
The guide piston (13) is towards offering two different annular concentrics of diameter on a side end face of pilot valve core (7)
Groove (17), the section semicircular in shape of annular groove (17)；
Micro- shape hole (11) is formed using Laser Processing, and the radius of micro- shape hole (11) is between 25 μm -45 μm；
The pressure regulation spiral shell handle (15) is arranged in pilot valve body (5), between the pilot valve body (5) and pressure regulation spiral shell handle (15)
Sealed by rectangular seal；
The front end of first pilot valve seat (6) is provided with damping sleeve (22), and resistance is offered along the centerline direction of damping sleeve (22)
Buddhist nun hole；
One end of the guide piston (13) carries out chamfer machining processing.
2. leading type water pressure overflow valve according to claim 1, it is characterised in that：Offered on the main valve body (1) into
On the one hand the mouth of a river (P), delivery port (T) and remote control mouth (K), the aqueous medium flowed into from water inlet (P) are acted under main valve plug (3)
End, hole (b) and pilot valve body (5) ante-chamber phase are on the other hand hindered through horizontal liquid resistance hole (a) on main valve body (1), vertical liquid
It is logical, through the fixer resistance (c) on pilot valve body (5) into the spring cavity (18) of main valve plug (3), in main valve body (1) and guide
Runner (d) is offered on valve body (5) to communicate with delivery port (T).
3. leading type water pressure overflow valve according to claim 1 or 2, it is characterised in that：The main valve body (1) and pilot valve
Valve body (5) is made of austenitic stainless steel, and surface carries out anodization；Main valve plug (3) and pilot valve core (7) are with metal
For base material, surface spraying zirconia ceramics.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510259603.8A CN104864137B (en) | 2015-05-20 | 2015-05-20 | Leading type water pressure overflow valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510259603.8A CN104864137B (en) | 2015-05-20 | 2015-05-20 | Leading type water pressure overflow valve |
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| CN104864137A CN104864137A (en) | 2015-08-26 |
| CN104864137B true CN104864137B (en) | 2017-11-14 |
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| CN201510259603.8A Active CN104864137B (en) | 2015-05-20 | 2015-05-20 | Leading type water pressure overflow valve |
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| Publication number | Priority date | Publication date | Assignee | Title |
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