CN103090070B - Piloted reducer - Google Patents
Piloted reducer Download PDFInfo
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- CN103090070B CN103090070B CN201110340982.5A CN201110340982A CN103090070B CN 103090070 B CN103090070 B CN 103090070B CN 201110340982 A CN201110340982 A CN 201110340982A CN 103090070 B CN103090070 B CN 103090070B
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Abstract
The present invention discloses a kind of piloted reducer, for the pilot valve solving existing piloted reducer is hit fragile and that noise is large shortcoming, the invention provides a kind of piloted reducer, this reduction valve adopts differential type pilot valve, it is the first cavity volume be communicated with filler opening inside pilot valve, outside is the second cavity volume being communicated with the first cavity volume by throttle orifice, guide valve core is slidedly arranged in guide valve seat, its tapering is positioned at the first cavity volume and is connected with damping spring, second cavity volume side establishes pressure adjusting spring to be connected with guide valve seat, pilot valve gap between guide valve seat and guide valve core, radial direction through hole and oil discharge passage form the leakage oil duct that pilot valve is opened.The present invention reduces impact force when pilot valve cuts out by the damping function of the guide valve core of the pilot valve of differential type, upside-down mounting, damping spring, axially movable guide valve seat and guide valve core and pilot valve throttle orifice, and make guide valve core be in steady state all the time, realize this reduction valve and impact little, life-span long, stable and advantage that noise is low.
Description
Technical field
The present invention relates to the piloted reducer in the hydrovalve of hydraulic system, particularly hydraulic system.
Technical background
Reduction valve is pressure control valve conventional in hydraulic system, is a kind of pressure regulator valve, is commonly used for stable oil circuit working pressure.Existing reduction valve is different with working principle by structure, can be divided into direct acting pressure and piloted reducer.And piloted reducer uses especially extensive.
In existing piloted reducer, guide valve seat is fixing, pilot valve cone (also claiming guide valve core) withstands on guide valve seat by pressure adjusting spring, the filler opening of pilot valve is communicated with the Returnning spring chamber of reduction valve main valve plug, Returnning spring chamber is communicated with by throttle orifice with the low pressure oil outlet port of reduction valve, and the pressure adjusting spring chamber of pilot valve is and hydraulic oil container circuit communication.When set pressure lower than pressure adjusting spring of the pressure in reduction valve low pressure oil outlet port, pilot valve is in closed condition, the pressure in low pressure oil outlet port equals the pressure in Returnning spring chamber, main valve plug moves and increases the oil circuit valve port opening of high pressure oil entrance to low pressure oil outlet port of reduction valve under the elastic force effect of Returnning spring, improves the flow that enters into the hydraulic oil in low pressure oil outlet port and improves the pressure in low pressure oil outlet port; When set pressure higher than pilot valve pressure adjusting spring of the pressure in low pressure oil outlet port, pilot valve is opened and the pressure in Returnning spring chamber is reduced rapidly, main valve plug compression reseting spring and moving under the effect of high pressure oil, reduce from high pressure oil ingress to the valve port opening of the oil circuit in low pressure oil outlet port, and then reduce the flow that enters into low pressure oil outlet port and reduce the pressure in low pressure oil outlet port.
Owing to there is multiple hydraulic actuator in hydraulic system, whether the work of these hydraulic actuators can cause the fluctuation of system pressure, and the pressure that pilot valve is stabilizing low voltage oil export place also opens and closes continually along with the fluctuation of system hydraulic pressure.And in existing piloted reducer, guide valve seat is fixing, when pilot valve cuts out, pilot valve cone can impact guide valve seat under the promotion of pressure adjusting spring, and pilot valve opens and closes continually, makes also to exist between pilot valve cone with guide valve seat to impact frequently, guide valve seat and pilot valve are bored also fragile because impacting frequently, cause the life-span of reduction valve low, when pilot valve is opened simultaneously, pilot valve cone is in vacant state, easy and valve seat collides and causes very large noise, adds the noise radiation of machine.
Summary of the invention
The object of the invention is to for the pilot valve of existing reduction valve be hit large and fragile and work time the large shortcoming of noise and provide a kind of structure simple, good stability, noise is little, the piloted reducer of long service life.
Technological scheme of the present invention is achieved in that a kind of piloted reducer of structure, comprise valve body, valve body is provided with high pressure oil entrance and low pressure oil exports, valve pocket is provided with in valve body, main valve plug is provided with in valve pocket, main valve plug moves along its axial direction along with it and changes the valve port opening from high pressure oil entrance to low pressure oil outlet port in valve pocket, also pilot valve is slidably equipped with in valve pocket, it is the first cavity volume between pilot valve and main valve plug, the opposite side of pilot valve has the second cavity volume, in first cavity volume, the axially loaded area of liquid effects on pilot valve is greater than the axially loaded area of liquid effects on pilot valve in the second cavity volume, main valve plug is provided with the main valve throttle orifice being communicated with low pressure oil outlet and the first cavity volume, pilot valve is provided with the pilot valve throttle orifice of connection first cavity volume and the second cavity volume, pilot valve comprises guide valve seat and guide valve core, establish in second cavity volume and make guide valve core be less than the limit stoper of guide valve seat to the second cavity volume direction sliding stroke to the shift motion in the second cavity volume direction, guide valve seat is provided with the pilot valve hole of an axial through guide valve seat, guide valve seat and valve pocket chamber wall sliding fit, guide valve core comprises the guide portion of head, afterbody forms the tapering sealed, the joint connecting guide portion and tapering for contacting with point limit, pilot valve hole, tapering is positioned at the first cavity volume, guide portion and pilot valve hole sliding fit, there is between joint and pilot valve hole pilot valve gap, when tapering disengages with point limit, pilot valve hole, pilot valve gap is communicated with the first cavity volume, guide valve seat is provided with the radial direction through hole being communicated with pilot valve gap, and valve body is provided with and is communicated with radial direction through hole and the oil discharge passage leading to valve body outside, damping spring is established in first cavity volume, one end of damping spring is connected with the taper contact of guide valve core, the other end contacts with main valve plug and connects, and is provided with pressure adjusting spring in the second cavity volume side of pilot valve, and pressure adjusting spring contacts with guide valve seat and connects and apply the elastic force to the first cavity volume direction to guide valve seat.
The working procedure of this reduction valve is as follows: first hydraulic oil enter the first cavity volume by main valve throttle orifice, when set pressure lower than pressure adjusting spring of the pressure in low pressure oil outlet port, pressure in first cavity volume is identical with the pressure in low pressure oil outlet port, main valve plug moves and increases the valve port opening of reduction valve under the promotion of Returnning spring, increases the flow that enters into low pressure oil outlet port and promotes the pressure in low pressure oil outlet port, when set pressure higher than pressure adjusting spring of the pressure in low pressure oil outlet port, hydraulic oil in first cavity volume and the active force of damping spring to pilot valve to be greater than in the second cavity volume hydraulic oil and pressure adjusting spring to the active force of pilot valve, pilot valve is moved (hydraulic oil of the second cavity volume also flows to the first cavity volume by pilot valve throttle orifice) to the second cavity volume direction, when guide valve core contacts with limit stoper, guide valve core stops mobile, guide valve seat continues mobile, now the point limit, pilot valve hole of guide valve core tapering and guide valve seat disengages, first cavity volume is communicated with pilot valve gap, hydraulic oil in first cavity volume is by pilot valve gap, radial direction through hole, oil discharge passage flow valves external body is to hydraulic oil container, pressure in first cavity volume is reduced rapidly, under the pressure effect of high pressure oil ingress hydraulic oil, main valve plug pilot valve direction is moved, high pressure oil entrance is reduced to the valve port opening in low pressure oil outlet port, reduce the hydraulic fluid flow rate entering low pressure oil outlet port, thus also just reduce the pressure in low pressure oil outlet port.When the pressure in the first cavity volume is reduced to certain value, hydraulic oil in first cavity volume and the axial force of damping spring to pilot valve to be less than in the second cavity volume hydraulic oil and pressure adjusting spring to the axial force of pilot valve, guide valve seat moves to main valve plug direction under the effect of pressure adjusting spring, make the point limit, pilot valve hole of guide valve seat and the taper contact of guide valve core, disconnect the oil circuit from the first cavity volume and pilot valve gap, make the boost in pressure of the first cavity volume, main valve plug both sides again reach stress balance and keep motionless straight, thus keep the pressure stability at low pressure oil outlet place constant.
In the present invention, guide valve core is slidedly arranged in the pilot valve hole of guide valve seat, make it only can slide axially along guide's valve opening by the guide portion of guide valve core and the sliding fit in pilot valve hole, pilot valve is in unlatching or closed condition is all belong to steady state, radial skew can not be produced, even utter long and high-pitched sounds so vibration can not be produced, the noise radiation of machine can not be increased.The open and close of pilot valve are also the control that the basis by the hydraulic difference of pilot valve two ends first cavity volume and the second cavity volume adopts pressure adjusting spring to carry out, the rigidity of pressure adjusting spring and pilot valve are at the first cavity volume, axially loaded area difference in second cavity volume is relevant, when this difference more hour, the rigidity requirement of pressure adjusting spring is less, therefore the present invention makes the axially loaded area difference acted on pilot valve of hydraulic oil in the second cavity volume slightly be less than hydraulic oil in the first cavity volume by design and acts on axially loaded area on pilot valve, thus the pressure adjusting spring that a rigidity is very little can be selected.Little rigidity pressure adjusting spring is when promoting guide valve seat and moving closedown pilot valve, and the impact of guide valve core and guide valve seat is just little, and guide valve core is connected by the damping spring that rigidity is less simultaneously, plays buffer function when guide valve seat contacts with guide valve core.In the process that pilot valve cuts out, pressure adjusting spring promotes guide valve seat and moves, the volume of the second cavity volume increases, hydraulic oil enters the second cavity volume by the oil circuit in connection first cavity volume and the second cavity volume, owing to being provided with pilot valve throttle orifice on this oil circuit, has damping function to the fluid flowing through this oil circuit, thus slow down the travelling speed of guide valve seat, reduce impact when guide valve seat contacts with guide valve core, reduce impact further, thus the working life of reduction valve is increased.
In the present invention, limit stoper is limited post, and its one end is fixedly connected with valve body, and the other end is for contacting the positive stop end connected with guide valve core.Valve body comprises valve pocket and bonnet, and bonnet is threaded mutually with valve pocket, and limited post and bonnet can be integrative-structures, also can be provided with the endoporus be socketed with limited post in the inner side of bonnet, limited post to be fixedly connected with endoporus by screw thread or drive fit sleeve in endoporus; Locking cap can also be provided with in addition in bonnet, the center of locking cap is provided with limited post fixed hole, limited post sleeve forms a fixed connection in fixed hole, the outer side surface of locking cap and the inner side surface of bonnet are connected, one end of pressure adjusting spring contacts with the shade of locking cap and connects, pressure regulation pad is established, the elastic force of Regulation spring between pressure adjusting spring and locking cap.
In the present invention, pilot valve throttle orifice can be arranged on guide valve seat, also can be arranged on guide valve core, when being arranged on guide valve core, the positive stop end end face of limited post be provided with flow into from end face, logical oily passage that side is flowed out, logical oily passage when guide valve core is connected with the spacing end contact of limited post be communicated with the oil circuit of the first cavity volume with the second cavity volume and be communicated with.Logical oily passage can be that the perforation of the connection counterbore arranged by the side of the counterbore arranged on positive stop end end face, positive stop end is formed, and logical oily passage can be the groove arranged on positive stop end end face.
In the present invention, guide valve seat can with the inwall sliding fit of valve pocket, pilot valve and valve body form the second cavity volume at pilot valve relative to the opposite side of the first cavity volume, and the outer side surface that guide valve seat coordinates with valve pocket is provided with the first seal groove, and the first seal groove is embedded with the first seal ring.Valve body can comprise valve seat, valve pocket, bonnet in addition, and one end of valve seat and valve pocket socket-connects, the other end of valve pocket and bonnet bolt, and main valve plug is slidedly arranged in valve seat, and oil discharge passage is be arranged on the oil groove that valve seat and valve pocket socket-connect on part surface.Guide valve seat is slidedly arranged in valve seat near the sections of the first cavity volume, sections near the second cavity volume is slidedly arranged in valve pocket, or seal sleeve is set in valve pocket, the madial wall of seal sleeve and guide valve seat are near the sections sliding fit of the second cavity volume, one end of seal sleeve contacts with bonnet and connects, and the other end contacts with valve seat and connects.Seal sleeve is set and guide valve seat is sealed and matched, easily ensures the inner side surface of seal sleeve and the coaxality of guide valve seat, make guide valve seat free sliding smooth and easy.
Also can be that guide valve seat arranges cavity on the end face of limited post in addition, the sidewall of cavity coordinates with limited post outer side surface, and form sliding fit, guide valve seat and limited post form the second cavity volume.The side that limited post matches with guide valve seat is provided with the second seal groove, and the second seal groove is embedded with the second seal ring.
The present invention compared with prior art, has following beneficial effect:
1, the present invention is designed by differential type and namely makes pilot valve be slightly less than the lifting surface area of pilot valve by hydraulic oil axial action in the first cavity volume by the lifting surface area of hydraulic oil axial action in the second cavity volume by design, thus select the pressure adjusting spring that a rigidity is less, the impact of guide valve seat and guide valve core during reduction pilot valve open and close, guide valve seat and guide valve core close contact time, the damping spring contacted with guide valve core can cushion the impact of guide valve seat to guide valve core, when pilot valve cuts out in addition, pilot valve throttle orifice plays damping function, reduce the impact between guide valve seat and guide valve core when pilot valve cuts out, thus the working life of pilot valve can be extended, also the working life of reduction valve is namely extended.
2, in the present invention, guide valve core is slidedly arranged in the pilot valve hole of guide valve seat, the guide portion of its head and pilot valve hole sliding fit is relied on to carry out radial location, make it only can slide axially along pilot valve hole, no matter pilot valve is in cut out or opening state, all can not produce skew and vibration in radial directions; Under the elastic force effect of damping spring, when pilot valve cuts out, guide valve core contacts with guide valve seat, contacts, so in the axial direction also all the time for steady state when pilot valve is opened with limit stoper.Therefore operationally pilot valve friction, noise are little for reduction valve of the present invention, can not increase the noise radiation of machine.
Accompanying drawing explanation
Fig. 1 is the structural representation sketch of reduction valve in the embodiment of the present invention 1;
Fig. 2 is the structural representation of the pilot valve executing reduction valve in example 1 when contacting with limit stoper;
Fig. 3 is the structural representation of cartridge pressure reduction valve in the embodiment of the present invention 2;
Fig. 4 is the structural representation of plug-in overflow valve in the embodiment of the present invention 3;
Fig. 5 is the structural representation of plug-in overflow valve in the embodiment of the present invention 4.
Component title and sequence number in figure:
Plug screw 1, low pressure oil outlet 2, main valve plug circular groove 3, main valve plug 4, damping spring 5, first cavity volume 6, guide valve core 7, guide valve seat 8, pilot valve oil outlet 9, valve pocket 10, limited post 11, second cavity volume 12, pressure adjusting spring 13, pressure regulation pad 14, bonnet 15, main valve throttle orifice 16, high pressure oil entrance 17, main valve plug annular boss 18, first seal groove 19, first seal ring 20, radial direction through hole 21, counterbore 22, radial penetration hole 23, guide portion 24, joint 25, pilot valve gap 26, tapering 27, pilot valve throttle orifice 28, valve block 19, high-pressure oil passage 30, tank oiling channel oil 31, locking cap 32, low pressure oil way 33, valve seat 34, seal sleeve 35, oil groove 36, guide valve core mesopore 37, second seal groove 38, second seal ring 39.
Embodiment
Below in conjunction with drawings and Examples, Differential Relief Valve of the present invention is described.
Embodiment 1:
As shown in Fig. 1 Fig. 2, the valve body of piloted reducer comprises valve pocket 10, the plug screw 11 be spirally connected respectively at valve pocket 10 two ends and bonnet 15, valve body is provided with high pressure oil entrance 17 and low pressure oil outlet 2, is provided with valve pocket at valve inner, in valve pocket, is provided with main valve plug 4, pilot valve.The chamber wall sliding fit of main valve plug 4, pilot valve and valve pocket, between pilot valve and main valve plug 4, form the first cavity volume 6, first cavity volume 6 export 2 by oil circuit with main valve throttle orifice 16 and low pressure oil and be communicated with, the other side of pilot valve is the second cavity volume 12.Pilot valve comprises guide valve core 7 and guide valve seat 8, pilot valve hole is established at the center of guide valve seat 8, pilot valve hole is axial penetration hole, guide valve core 7 comprises the guide portion 24 of head, the tapering 27 of afterbody, connect the joint 25 in guide portion and tapering, wherein guide portion 24 is slidedly arranged on to be formed in pilot valve hole and with valve opening and seals sliding fit, pilot valve gap 26 is had between the inwall in joint 25 and pilot valve hole, tapering 27 is positioned at the first cavity volume 6, when tapering 27 disengages with point limit, pilot valve hole, first cavity volume 6 is communicated with pilot valve gap 26, when tapering 27 contacts with point limit, pilot valve hole, first cavity volume 6 is closed with the oil circuit in pilot valve gap 26, guide valve core 7 is provided with the pilot valve throttle orifice 28 of connection first cavity volume 6 and the second cavity volume 12.Guide valve seat 8 is provided with radial direction through hole 21, and radial direction through hole 21 is communicated with pilot valve gap 26.Valve pocket 10 is provided with the pilot valve oil outlet 9 be communicated with radial direction through hole 21.The external diameter that guide valve seat 8 closes on the side section of the first cavity volume 6 is greater than the external diameter that guide valve seat 8 closes on the second cavity volume 12 side section, makes the axially effectively lifting surface area acted on pilot valve of the hydraulic oil in the first cavity volume 6 be greater than hydraulic oil in the second cavity volume 12 and acts on axially effective lifting surface area on pilot valve.Damping spring 5 is set between guide valve core 7 and main valve plug 4.In the second cavity volume 12, be provided with pressure adjusting spring 13, guide valve seat 8 is withstood in one end of pressure adjusting spring 13, and the other end contacts with bonnet 15 and connects and and arrange pressure regulation pad 14 between bonnet 15 to regulate the elastic force of pressure adjusting spring 13.Limited post 11 is provided with in the second cavity volume 12, limited post 11 is structure as a whole with bonnet 14, its termination is the positive stop end contacted for the termination of the guide portion 24 with guide valve core 7, and when pilot valve is moved to the second cavity volume 12 direction, the sliding stroke of guide valve core 7 is less than the stroke of guide valve seat 8.The spacing end face of limited post 11 is provided with counterbore 22, side is provided with and is communicated with the radial penetration hole 23 of counterbore 22, during the spacing end contact of guide valve core 7 with limited post 11, the second cavity volume 12 is communicated with pilot valve throttle orifice 28 by radial penetration hole 23, counterbore 22.The side that guide valve seat 8 size diameter section coordinates with valve pocket is provided with in the first seal groove 19, first seal groove 19 and seal ring 20 is set.
In the piloted reducer of the present embodiment, when the pressure that low pressure oil exports 2 places equals the set pressure of pressure adjusting spring 13, main valve plug 4 is in steady state under the impetus of damping spring 5, keeps stable aperture, when the set pressure of the pressure that low pressure oil exports 2 places lower than pressure adjusting spring 13, support or oppose under the promotion of damping spring 5 direction of pilot valve of main valve plug 4 is moved, space between main valve plug annular boss 18 and valve pocket 10 chamber wall increases, the aperture exporting the valve port of 2 from main valve plug circular groove 3 to low pressure oil increases, also namely improve and enter into from high pressure oil entrance 17 hydraulic fluid flow rate that low pressure oil exports 2 places, improve the pressure that low pressure oil exports 2 places, when the set pressure of the pressure that low pressure oil exports 2 places higher than pressure adjusting spring 13, pressure in first cavity volume 6 equals the pressure that low pressure oil exports 2 places, the active force of the hydraulic oil in the first cavity volume 6 and damping spring 5 pairs of pilot valves is greater than the active force of hydraulic oil and pressure adjusting spring 13 pairs of pilot valves in the second cavity volume 12, hydraulic oil in first cavity volume 6 promotes guide valve seat 8 and together moves with guide valve core 7 and compress pressure adjusting spring 13, when after guide valve core 7 with the spacing end contact of limited post 11, guide valve core 7 no longer moves, guide valve seat 8 continues mobile, when guide valve seat 8 continues mobile, the tapering 27 of guide valve core 7 disengages with the sharp limit in pilot valve hole, hydraulic oil in first cavity volume 6 is by pilot valve gap 26, radial direction through hole 21, pilot valve oil outlet 9 flows to the hydraulic oil container of hydraulic system, the pressure in the first cavity volume 6 is caused to reduce rapidly, the direction of primary spools 4 pilot valve is moved, reduce the aperture of valve port, also namely reduce high pressure oil entrance 17 place and flow to the flow that low pressure oil exports 2 places, the pressure making low pressure oil export 2 places reduces.When the pressure in the first cavity volume 6 is reduced to certain value, the active force of the hydraulic oil in the first cavity volume 6 and damping spring 5 pairs of pilot valves is less than the active force of hydraulic oil and pressure adjusting spring 13 pairs of pilot valves in the second cavity volume 12, guide valve seat 8 moves to the direction of main valve plug 4 under the promotion of pressure adjusting spring 13, the valve opening point limit of guide valve seat 8 contacts to be formed with the tapering 27 of guide valve core 7 and seals, close the oil circuit in the first cavity volume 6 to pilot valve gap 26, make the boost in pressure in the first cavity volume 6 and stop determining the movement of main valve plug 4, main valve plug 4 is made to keep the pressure at current aperture and stabilizing low voltage oil export 2 place.When valve opening point limit and the taper contact of guide valve core 7 of guide valve seat 8, guide valve core 7 compresses damping spring 5 and moves to main valve plug direction, damping spring 5 plays buffer function, reduce the percussion of guide valve seat 8 pairs of guide valve cores 7, in addition in the process of guide valve seat 8 movement, the volume of the second cavity volume 12 increases, hydraulic oil enters into the second cavity volume 12 by pilot valve throttle orifice 28, but due to the damping function of pilot valve throttle orifice 28, slow down hydraulic oil and enter into the second cavity volume 12, also namely slow down the travelling speed of guide valve seat 8, the impact force of further reduction guide valve seat 8 pairs of guide valve cores 7, improve the working life of pilot valve.
Embodiment 2:
As shown in Figure 3, in the present embodiment, reduction valve is cartridge pressure reduction valve, valve pocket 10 is provided with screw thread, when carrying out plug-in mounting with valve block 29 and valve block 29 bolt, high pressure oil entrance 17 on valve pocket is communicated with low pressure oil way 33 with the high-pressure oil passage 30 on valve block 29 respectively with low pressure oil outlet 2, and the pilot valve oil outlet 9 on valve pocket 10 is communicated with the tank oiling channel oil 31 on valve block 29.This enforcement is compared with the first embodiment, its structure main difference point is the means of fixation of limited post 11, in the present embodiment, valve body is included in the locking cap 32 arranged in bonnet 15, the center of locking cap 32 is provided with the fixed hole of fixing limited post 11, limited post 11 sleeve is fixedly connected with locking cap 32 in fixed hole, the outer of locking cap 32 coordinates with the madial wall of bonnet 15, locking cap 32 is withstood on the bottom of bonnet 15 by pressure adjusting spring 13, arranges pressure regulation pad 14 between pressure adjusting spring 13 and locking cap 32.
Embodiment 3:
As shown in Figure 4, in the present embodiment, reduction valve is cartridge pressure reduction valve, the valve body of the reduction valve that its difference is in the present embodiment comprises valve seat 34 compared with embodiment 2, valve pocket 10, bonnet 15, valve pocket 10 is socketed on one end of valve seat 34, the screw thread for being threaded with valve block 29 is provided with outside the termination that valve pocket 10 is socketed on valve seat, bonnet 15 is bolted in the other end of valve pocket 10, main valve plug 4 is slidedly arranged in valve seat, high pressure oil entrance 17 is arranged on the side of valve seat 34, low pressure oil outlet 2 is arranged on the end face of valve seat 34, the circular groove 3 of main valve plug is communicated with the main valve plug mesopore 37 of main valve plug core, hydraulic oil is from the circular groove 3 of high pressure oil entrance 17 through main valve plug 4 side, main valve plug mesopore 37 flows out from low pressure oil outlet 2, wherein main valve plug 4 moving axially in valve seat 34 can change from the valve port opening of high pressure oil entrance 17 to main valve plug side circular groove 3 to change the hydraulic fluid flow rate exporting 2 from high pressure oil entrance 17 to low pressure oil to export 2 pressure with regulating and controlling low pressure oil, seal sleeve 35 is arranged with in valve pocket 10, one end of seal sleeve 35 contacts with valve seat 34 and connects, the other end contacts with bonnet 15 and connects, the enlarged diameter section of guide valve seat 8 is slidedly arranged in valve seat 34, reduced diameter section is slidedly arranged in seal sleeve 35.The outside of the part socket-connected at valve seat 34 and valve pocket 10 is provided with oil groove 36, and one end of oil groove 36 is communicated with radial direction through hole 21 by the gap of valve seat end face, and the other end then communicates with the tank oiling channel oil 31 on valve block 29 and forms pilot valve oil outlet.
Embodiment 4:
As shown in Figure 5, compared with embodiment 3, its difference is that guide valve seat 8 contacts with pressure adjusting spring on the end face that connects and has a cavity, the sidewall of cavity and the outer side wall sliding fit of limited post 11, the second cavity volume 12 is formed between pilot valve and limited post 11, limited post 11 and the diameter of the pilot valve cavity chamber wall section of cooperation are less than the diameter of guide valve seat 8 and valve seat 34 section of cooperation, the side that limited post 11 matches with guide valve seat 8 is provided with the second seal groove 38, has been embedded in seal ring 39 at seal groove 38, limited post 11 is fixedly connected with bonnet by locking cap 32.
Claims (10)
1. a piloted reducer, comprise valve body, described valve body is provided with high pressure oil entrance (17) and exports (2) with low pressure oil, valve pocket is provided with in valve body, main valve plug (4) is provided with in valve pocket, described main valve plug (4) moves along its axial direction along with it and changes the valve port opening exporting (2) from high pressure oil entrance (17) to low pressure oil in valve pocket, it is characterized in that also being slidably equipped with pilot valve in valve pocket, be the first cavity volume (6) between described pilot valve and main valve plug (4), the opposite side of pilot valve has the second cavity volume (12), the axially loaded area of first cavity volume (6) interior liquid effects on pilot valve is greater than the axially loaded area of liquid effects on pilot valve in the second cavity volume (12), main valve plug (4) is provided with the main valve throttle orifice (16) being communicated with low pressure oil outlet (2) and the first cavity volume (6), pilot valve is provided with the pilot valve throttle orifice (28) of connection first cavity volume (6) and the second cavity volume (12), described pilot valve comprises guide valve seat (8) and guide valve core (7), establish in second cavity volume (12) and make guide valve core (7) be less than the limit stoper of guide valve seat (8) to the second cavity volume (12) sliding stroke to the shift motion in the second cavity volume (12) direction, guide valve seat (8) is provided with the pilot valve hole of an axial through guide valve seat, guide valve seat (8) and valve pocket chamber wall sliding fit, described guide valve core (7) comprises the guide portion (24) of head, afterbody is used for contacting with point limit, pilot valve hole the tapering (27) being formed and seal, connect the joint (25) of guide portion (24) and tapering (27), described tapering (27) is positioned at the first cavity volume (6), described guide portion (24) and described pilot valve hole sliding fit, there is between described joint (25) and pilot valve hole pilot valve gap (26), when tapering (27) disengages with point limit, pilot valve hole, pilot valve gap (26) are communicated with the first cavity volume (6), guide valve seat (8) is provided with the radial direction through hole (21) being communicated with pilot valve gap (26), valve body is provided with and is communicated with radial direction through hole (21) and the oil discharge passage (9) leading to valve body outside, damping spring (5) is established in first cavity volume (6), one end of damping spring (5) contacts with the tapering (27) of guide valve core (7) and connects, the other end contacts with main valve plug (4) and connects, be provided with pressure adjusting spring (13) in the second cavity volume (12) side of pilot valve, pressure adjusting spring (13) contacts with guide valve seat (8) and connects and apply the elastic force to the first cavity volume (6) direction to guide valve seat.
2. piloted reducer according to claim 1, is characterized in that, described limit stoper is limited post (11), and its one end is fixedly connected with valve body, and the other end is for contacting with guide valve core (7) positive stop end connected.
3. piloted reducer according to claim 2, it is characterized in that, pilot valve throttle orifice (28) is arranged on described guide valve core (7), the positive stop end end face of described limited post (11) is provided with the logical oily passage flowed out from end face inflow, side, and described logical oily passage second cavity volume (12) when guide valve core (7) is connected with positive stop end end contact is communicated with the first cavity volume (6) with pilot valve throttle orifice (28) by logical oily passage.
4. piloted reducer according to claim 2, it is characterized in that, described valve body comprises valve pocket (10) and bonnet (15), described bonnet (15) and valve pocket (10) bolt, described limited post (11) is fixedly connected with described bonnet (15).
5. piloted reducer according to claim 4, it is characterized in that, locking cap (32) is provided with in described bonnet (15), the center of described locking cap (32) is provided with limited post fixed hole, limited post (11) sleeve is in fixed hole, the outer side surface of described locking cap (32) and the inner side surface of described bonnet (15) are connected, and one end of described pressure adjusting spring (13) contacts with locking cap (32) and connects and provide the elastic force of guide valve seat (8) dorsad to locking cap.
6. the piloted reducer according to any one of claim 2 to 5, it is characterized in that, the end face of the contiguous limited post (11) of described guide valve seat (8) is provided with a cavity, and the side sliding fit of the chamber wall of described cavity and limited post (11) connects and composes described second cavity volume (12).
7. piloted reducer according to any one of claim 1 to 5, it is characterized in that, the outer side surface that described guide valve seat (8) coordinates with valve pocket chamber wall is provided with the first seal groove (19), and described first seal groove (19) is embedded with the first seal ring (20).
8. piloted reducer according to claim 6, it is characterized in that, the side that described limited post (11) matches with guide valve seat (8) is provided with the second seal groove (38), and described second seal groove is embedded with the second seal ring (39).
9. piloted reducer according to any one of claim 1 to 3, it is characterized in that, described valve body comprises valve seat (34), valve pocket (10), bonnet (15), described valve seat (34) socket-connects with one end of valve pocket (10), the other end of valve pocket (10) and bonnet (15) bolt, described main valve plug (4) is slidedly arranged in valve seat (34), the oil groove (36) that described oil discharge passage socket-connects on part surface for being arranged on valve seat (34) and valve pocket (10).
10. piloted reducer according to claim 9, it is characterized in that, described guide valve seat has seal sleeve (35) near the arranged outside of the sections of the second cavity volume (12), the madial wall of described seal sleeve (35) and guide valve seat (8) sliding fit, one end of seal sleeve (35) contacts with bonnet (15) and connects, and the other end contacts with valve seat (34) and connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110340982.5A CN103090070B (en) | 2011-11-02 | 2011-11-02 | Piloted reducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110340982.5A CN103090070B (en) | 2011-11-02 | 2011-11-02 | Piloted reducer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103090070A CN103090070A (en) | 2013-05-08 |
| CN103090070B true CN103090070B (en) | 2015-12-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110340982.5A Active CN103090070B (en) | 2011-11-02 | 2011-11-02 | Piloted reducer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103122880B (en) * | 2011-11-18 | 2016-05-04 | 广西柳工机械股份有限公司 | Adjustable pilot-operated pressure-reducing valve |
| CN103470562B (en) * | 2013-09-06 | 2016-03-02 | 鞍钢股份有限公司 | A kind of high frequency back pressure valve and back pressure method thereof |
| CN104455472A (en) * | 2014-10-24 | 2015-03-25 | 中国工程物理研究院化工材料研究所 | Charging-discharging valve |
| CN105605254A (en) * | 2016-03-18 | 2016-05-25 | 中国船舶重工集团公司第七0四研究所 | Supplement load type high-pressure air safety valve with buffering on-off function |
| CN107655241B (en) * | 2016-07-26 | 2021-11-30 | 浙江盾安禾田金属有限公司 | Pilot-operated electronic expansion valve |
| CN106122152B (en) * | 2016-08-31 | 2017-11-21 | 山东泰丰液压股份有限公司 | Ultra high pressure control valve |
| CN108692037B (en) * | 2018-07-06 | 2021-06-04 | 济宁落陵春辉机械制造有限公司 | Pilot-operated type hydraulic control stop 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 |
| CN111750575B (en) * | 2019-03-29 | 2022-11-08 | 浙江盾安禾田金属有限公司 | Two-way throttle valve |
| CN110864028B (en) * | 2019-11-28 | 2021-05-11 | 上海诺玛液压系统有限公司 | Engineering machinery damping control valve |
| CN111692148B (en) * | 2020-04-30 | 2022-08-30 | 武汉船用机械有限责任公司 | Safety valve for hydraulic pump |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU612091A1 (en) * | 1977-01-18 | 1978-06-25 | Пензенский Политехнический Институт | Safety reducing valve |
| DE3239931A1 (en) * | 1982-10-28 | 1984-05-03 | Mannesmann Rexroth GmbH, 8770 Lohr | Pressure valve, especially a pressure-limiting valve, pressure-reducing valve or the like |
| US7225830B1 (en) * | 2005-02-09 | 2007-06-05 | Kershaw Charles H | Fluid control valve |
| CN1699808A (en) * | 2005-06-20 | 2005-11-23 | 浙江大学 | Slide valve type pilot ultra-high pressure pneumatic proportional pressure-reducing valve |
| CN201269336Y (en) * | 2008-07-18 | 2009-07-08 | 宁波星箭航天机械厂 | Gas pressure reducing valve |
| CN201288869Y (en) * | 2008-10-28 | 2009-08-12 | 上海立新液压有限公司 | Balance control valve |
| CN201284857Y (en) * | 2008-10-31 | 2009-08-05 | 徐州重型机械有限公司 | Balance valve |
| CN201747984U (en) * | 2010-06-25 | 2011-02-16 | 徐州徐工挖掘机械有限公司 | Throttling and reducing integrated valve |
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