CN103122883B - Adjustable pilot reduction valve - Google Patents
Adjustable pilot reduction valve Download PDFInfo
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- CN103122883B CN103122883B CN201110367759.XA CN201110367759A CN103122883B CN 103122883 B CN103122883 B CN 103122883B CN 201110367759 A CN201110367759 A CN 201110367759A CN 103122883 B CN103122883 B CN 103122883B
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Abstract
The present invention discloses a kind of adjustable pilot reduction valve, to be hit fragile and that noise is large shortcoming for solving opening device in existing reduction valve, the invention provides a kind of reduction valve, this valve adopts differential type pilot valve, it is the first cavity volume be communicated with pilot valve filler opening in pilot valve side, opposite side is the second cavity volume being communicated with the first cavity volume by oil circuit between chamber, guide valve core is slidedly arranged in guide valve seat, tapering is positioned at the first cavity volume and is connected with damping spring, pressure adjusting spring and adjustable diameter and screw adjusting mechanism are established in second cavity volume side, pilot valve gap between guide valve seat and guide valve core, radial direction through hole and pilot valve oil outlet form the leakage oil duct that pilot valve is opened, by adjustable diameter and screw adjusting, mechanism conveniently regulates cracking pressure.The present invention reduces impact force when pilot valve cuts out by 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 make guide valve core be in steady state all the time, realize this reduction valve pilot valve impact little, the life-span is long, steady state noise is low, the advantage of easy adjustment.
Description
Technical field
The present invention relates to the adjustable pilot reduction valve in the hydraulic element 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 piloted reducer be hit large and fragile, the life-span is short, and pilot valve guide valve core when opening is in quick condition and easily produces vibration and the shortcoming of uttering long and high-pitched sounds, and a kind of good stability is provided, noise is little, the adjustable pilot reduction valve of the low pressure oil outlet pressure adjustable of long service life.
Technological scheme of the present invention is achieved in that a kind of adjustable pilot reduction valve of structure, it main valve opening device comprising main valve and be fixedly connected with main valve, and main valve comprises main valve body, and main valve body is provided with main valve plug chamber, high pressure filler opening, low pressure oil outlet; Arranging in main valve plug chamber can the main valve plug of movement vertically wherein, one end of main valve plug is connected with Returnning spring, main valve plug is provided with the epicoele adjacent with main valve plug in the same side of Returnning spring, epicoele is the control chamber that main valve plug is opened, when upper cavity pressure reduce certain value time, main valve plug both sides by force unbalance upwards cavity direction move.Described main valve plug moves along main valve plug axial direction along with it and changes the valve port opening from high pressure filler opening to low pressure oil outlet in main valve plug chamber.Main valve opening device comprises a valve body, a valve pocket is established in valve body, slide in valve pocket and establish a pilot valve, the side of pilot valve is the first cavity volume, opposite side has the second cavity volume, first cavity volume is communicated with epicoele, first cavity volume detects oil circuit by oil pressure and is communicated with low pressure oil outlet, detect on oil circuit at oil pressure and be provided with main valve throttle orifice, , in first cavity volume, the axial area of liquid effects on pilot valve is greater than the axial area of liquid effects on pilot valve in the second cavity volume, oil circuit between the chamber being provided with connection first cavity volume and the second cavity volume in pilot valve, pilot valve comprises guide valve core and guide valve seat, guide valve seat and valve pocket inwall sliding fit, guide valve seat is provided with the pilot valve hole of an axial through guide valve seat, guide valve core comprises the guide portion of head, the tapering of afterbody, connect the joint in guide portion and tapering, guide portion and described pilot valve hole sliding fit, between joint and pilot valve hole hole wall, there is pilot valve gap, tapering is positioned at the first cavity volume, when tapering disengages with guide valve seat point limit, the first cavity volume is communicated with pilot valve gap, guide valve seat is provided with the radial direction through hole being communicated with pilot valve gap, valve body is provided with the pilot valve oil outlet being communicated with radial direction through hole, damping spring is provided with in first cavity volume, one end of damping spring is connected with valve body contact, the other end is connected with the taper contact of guide valve core, guide spool applies the elastic force towards the second cavity volume direction, pressure adjusting spring and controlling device is established in the second cavity volume side, one end of pressure adjusting spring contacts with guide valve seat and connects, the other end is connected with valve body contact, and controlling device makes guide valve core be less than guide valve seat to the second cavity volume direction shift motion to the shift motion in the second cavity volume direction can to regulate guide valve core stroke end position.
The working principle of adjustable pilot reduction valve of the present invention is as follows: when pilot valve cracking pressure not higher than reduction valve of the pressure at low pressure oil outlet place, first cavity volume of pilot valve, the epicoele of main valve have identical pressure with low pressure oil outlet place, main valve plug keeps stress balance by the effect of hydraulic oil, low pressure oil outlet place hydraulic oil in Returnning spring, epicoele, gap size from high pressure filler opening to low pressure oil outlet is constant, and the pressure keeping low pressure oil outlet place is certain value.
When the pressure of low pressure oil outlet raises gradually, the axially loaded area being positioned at the first cavity volume due to pilot valve is greater than the axially loaded area that pilot valve is positioned at the second cavity volume, hydraulic oil in the first cavity volume active force boost value acted on pilot valve is greater than hydraulic oil in the second cavity volume and acts on the active force boost value on pilot valve, when the pressure in the first cavity volume reaches the set pressure of opening device, 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 oil circuit between chamber) to the second cavity volume, when guide valve core contacts with controlling device, guide valve core stops mobile, guide valve seat continues to move to the direction of the second cavity volume, now the tapering of guide valve core and guide valve seat point limit disengage, first cavity volume is communicated with pilot valve gap, hydraulic oil in first cavity volume is by pilot valve gap, radial direction through hole, pilot valve oil outlet flows out the first cavity volume, pressure in first cavity volume is reduced rapidly, thus the pressure reduced in the epicoele of the main valve plug be connected with the first cavity volume, make primary spools upwards cavity direction move, reduce from high pressure filler opening to the gap of low pressure oil outlet, also namely valve port opening is reduced, the pressure of low pressure oil outlet is reduced.When the pressure in the first cavity volume is reduced to the set pressure of opening device closedown, 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 the first cavity volume direction under the effect of pressure adjusting spring, make the taper-face contact in the tapering of guide valve seat point limit and 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 and epicoele, main valve plug again reaches stress balance and keeps current location, keep from high pressure filler opening to the valve port opening of low pressure oil outlet, also the pressure of low pressure oil outlet is namely kept.In the present invention, the stroke of guide valve core is regulated by controlling device, also namely regulate guide valve core when contacting spacing with controlling device i.e. pilot valve unlatching time the pressure adjusting spring reduction length that compressed by guide valve seat, also namely regulate the elastic force of pressure adjusting spring when pilot valve is opened to realize regulating the cracking pressure of this opening device, namely regulate the pressure at low pressure oil outlet place.The present invention is arranged on the side of pilot valve oil-feed by the pilot valve of differential type, the guide valve core of upside-down mounting and guide valve core, damping spring, the measure such as axially movable guide valve seat and guide valve core reduce impact force when pilot valve cuts out, and make guide valve core be in a steady state all the time, impact the advantage little, the life-span is long, noise is low to realize this pilot valve.
In the present invention, oil circuit is provided with pilot valve throttle orifice between chamber, in the process that pilot valve cuts out, pressure adjusting spring promotes guide valve seat and moves to the first cavity volume direction, and the volume of the second cavity volume increases, and hydraulic oil flows to the second cavity volume by oil circuit between chamber from the first cavity volume, due to oil circuit between chamber being provided with throttle orifice, the hydraulic oil be by convection in the second cavity volume has damping function, therefore, it is possible to slow down the speed of guide valve seat to the first cavity volume direction movement, thus reduces the impact between guide valve seat and guide valve core.
In the present invention, controlling device comprises adjustable lever, and one end of adjustable lever is the spacing adjustable side contacted with the guide portion termination of guide valve core, and the other end is the connecting end be connected with valve body by screw mechanism.Regulated the position of the adjustable side of adjustable lever by screw mechanism and realize regulating the stroke that contacts with adjustable lever of guide valve core and position.Screw mechanism comprises the adjustable lever mounting hole that is arranged on connecting valve inside and outside on valve body and is arranged on the regulating nut be spirally connected with valve body outside mounting hole, the connecting end of adjustable lever with mounting hole sliding fit and termination contact with regulating nut and connect.By rotary nut, realize stroke when adjustable lever slides and regulates guide valve core to contact with adjustable lever in mounting hole and position.Screw mechanism can also be comprise the adjustable lever mounting hole being arranged on connecting valve inside and outside on valve body, the connecting end of adjustable lever is arranged in mounting hole, connecting end and the mounting hole hole wall of adjustable lever are provided with the screw thread cooperatively interacted, and the end face of adjustable lever connecting end is provided with inner hexagonal hole.
In the present invention, the end face of the contiguous controlling device of guide valve seat is provided with a cavity, and the sidewall of cavity and the side-fit of adjustable lever form described second cavity volume.
In the present invention, between chamber, oil circuit can be arranged on guide valve seat, also can be arranged on guide valve core, when being arranged on guide valve core, the spacing adjustable side of adjustable lever is provided with the logical oily passage flowed out from end face inflow, side, connect when spacing adjustable side contacts with guide valve core, between chamber, oil circuit is communicated with the second cavity volume by logical oily passage.Logical oil duct can take various ways, such as on the end face of spacing adjustable side, be provided with counterbore, side is provided with the perforation running through counterbore sidewall, counterbore is communicated with oil circuit between chamber when guide valve core contacts connect with spacing adjustable side, or arrange on the end face of spacing adjustable side and run through the end face oil groove of whole spacing adjustable side end face, guide valve core to contact with spacing adjustable side connect time end face oil groove be communicated with oil circuit between chamber.
The present invention provides another kind of technological scheme for solving its technical problem, the program is a kind of adjustable pilot reduction valve of structure, it main valve opening device comprising main valve and be fixedly connected with main valve, main valve comprises main valve body, and main valve body is provided with main valve plug chamber, high pressure filler opening, low pressure oil outlet; Arranging in main valve plug chamber can the main valve plug of movement vertically wherein, one end of main valve plug is connected with Returnning spring, main valve plug is provided with the epicoele adjacent with main valve plug in the same side of Returnning spring, epicoele is the control chamber that main valve plug is opened, when upper cavity pressure reduce certain value time, main valve plug both sides by force unbalance upwards cavity direction move.Described main valve plug moves along main valve plug axial direction along with it and changes the valve port opening from high pressure filler opening to low pressure oil outlet in main valve plug chamber.Main valve opening device comprises a valve body, a valve pocket is established in valve body, slide in valve pocket and establish a pilot valve, the side of pilot valve is the first cavity volume, opposite side has the second cavity volume, first cavity volume is communicated with epicoele, first cavity volume detects oil circuit by oil pressure and is communicated with low pressure oil outlet, detect on oil circuit at oil pressure and be provided with main valve throttle orifice, in first cavity volume, the axial area of liquid effects on pilot valve is greater than the axial area of liquid effects on pilot valve in the second cavity volume, oil circuit between the chamber being provided with connection first cavity volume and the second cavity volume in pilot valve, described pilot valve comprises guide valve core and guide valve seat, described guide valve seat and pilot valve cavity wall sliding fit, guide valve seat is provided with the pilot valve hole of an axial through guide valve seat, described guide valve core comprises the guide portion of head, the tapering of afterbody, connect the joint in guide portion and tapering, described guide portion and described pilot valve hole sliding fit, between described joint and pilot valve hole hole wall, there is pilot valve gap, described tapering is positioned at the first cavity volume, when tapering disengages with guide valve seat point limit, the first cavity volume is communicated with pilot valve gap, guide valve seat is provided with the radial direction through hole being communicated with pilot valve gap, valve body is provided with the pilot valve oil outlet being communicated with radial direction through hole, damping spring is provided with in first cavity volume, one end of damping spring is connected with valve body contact, the other end is connected with the taper contact of guide valve core, guide spool applies the elastic force towards the second cavity volume direction, pressure adjusting spring, adjustable diameter and screw adjusting mechanism is provided with in the second cavity volume side, one end of described pressure adjusting spring contacts with guide valve seat and connects, the other end is connected with adjustable diameter and screw adjusting mechanism and can be regulated the pretension elastic force of pressure adjusting spring by adjustable diameter and screw adjusting mechanism, the sidewall of the first cavity volume is provided with spacing shoulder, is provided with the spacing preiection of spacing shoulder Corresponding matching in the tapering of guide valve core.When reduction valve in the present invention works, when the setting of the pressure in the first cavity volume higher than pressure adjusting spring, the positive stop lug boss in guide valve core tapering and the limit dais shoulder grafting of the first cavity volume sidewall touch and make guide valve core stop moving, guide valve seat continues mobile and causes pilot valve to be opened, and the pressure in the first cavity volume is reduced.The pressure regulating pilot valve to open by the pretension elastic force of adjustable diameter and screw adjusting mechanism Regulation spring in the present invention, the low pressure oil outlet pressure realizing reduction valve regulates.
In the present invention adjustable diameter and screw adjusting mechanism comprise adjustable lever, arrange on valve body for the pilot hole of adjustable lever sliding fit, be arranged on the nut be connected with valve body screw thread outside pilot hole, the inner end of described adjustable lever contacts with pressure adjusting spring and connects, and outer end contacts with nut and connects.The adjustable lever that adjustable diameter and screw adjusting mechanism can also be direct in addition and valve body is spirally connected, the inner end of adjustable lever contacts with pressure adjusting spring, and outer end is positioned at outside valve body, available tool into rotation adjustable lever.
The present invention compared with prior art, has following beneficial effect:
1. in adjustable pilot reduction valve of the present invention, guide valve core and guide valve seat all can slide axially, and when pilot valve cuts out, guide valve seat guide spool moves, and guide valve core is subject to the effect of damping spring, impact when available buffer guide valve seat contacts with guide valve core; The present invention 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 in addition, thus the pressure adjusting spring that rigidity is less can be selected, the impact of guide valve seat and guide valve core during reduction pilot valve open and close.The present invention reduces impact force when guide valve seat is closed with guide valve core by the buffering etc. of the guide valve seat that can move axially, guide valve core, damping spring, thus the working life of prolongation pilot valve.
2. in the present invention, guide valve core is by its guide rod and valve opening sliding fit, make it only can slide axially along guide's valve opening, can not produce radial skew, in addition when pilot valve is opened, one end of guide valve core is subject to the extruding of damping spring, the other end and controlling mechanism or limit dais shoulder grafting touch, make it be in a kind of steady state, even utter long and high-pitched sounds so vibration can not be produced, the noise radiation of machine can not be increased.
3. stroke when regulating guide valve core to contact with controlling device by controlling device in the present invention and final position or by the elastic force of adjustable diameter and screw adjusting mechanism Regulation spring, conveniently realize the correction adjustment to cracking pressure in the adjustment of this reduction valve cracking pressure and using process.
Accompanying drawing explanation
Fig. 1 is the structural representation of adjustable pilot reduction valve in the embodiment of the present invention 1;
Fig. 2 is the structural representation of main valve opening device in adjustable pilot reduction valve in embodiment 1;
Fig. 3 is the structural representation of pilot valve and controlling mechanism in embodiment 1;
Fig. 4 is the structural representation of main valve in embodiment 1;
Fig. 5 is the structural representation of adjustable pilot reduction valve in the embodiment of the present invention 2;
Fig. 6 is the structural representation of adjustable pilot reduction valve in the embodiment of the present invention 3;
Fig. 7 is the structural representation of adjustable pilot reduction valve in the embodiment of the present invention 4;
Fig. 8 is the structural representation of adjustable pilot reduction valve in the embodiment of the present invention 5.
Component title and sequence number in figure:
1, plug screw 11, valve pocket 12, pilot valve filler opening 13, pilot valve oil outlet 14, valve seat 15, spacing shoulder 16, oil pressure detect oil circuit entrance 17;
2, the first cavity volume 21, second cavity volume 22, damping spring 23, pressure adjusting spring 24;
3, main valve plug 3, main valve throttle orifice 31, epicoele 34, main valve sleeve 35;
4, oil circuit 44, pilot valve gap 45, pilot valve throttle orifice 46, spacing preiection 47 between guide valve core 4, guide portion 41, tapering 42, joint 43, chamber;
5, guide valve seat 5, radial direction through hole 51;
6, main valve body 61, main valve oil pressure detect oil circuit 62, Returnning spring 64, pilot valve overflow oil circuit 65, high pressure filler opening 66, low pressure oil outlet 67;
8, adjustable lever 8, counterbore 81, radial perforation 82, end face oil groove 83, inner hexagonal hole 84, spacing section 85, adjustment section 86, spherojoint 87;
9, nut 9, fastening screw nut 91.
Embodiment
Below in conjunction with drawings and Examples, adjustable pilot reduction valve of the present invention is described.
Embodiment 1:
As shown in Figure 1, the main valve opening device A that adjustable pilot reduction valve comprises main valve B and is fixedly connected with main valve, as shown in Figure 4, main valve B comprises main valve body 61, main valve body 61 is provided with high pressure filler opening 66, low pressure oil outlet 67, in main valve body, be provided with main valve sleeve 35, slide in main valve sleeve 35 and establish main valve plug 3;
Main valve plug 3 can move vertically in main valve sleeve, and the upside of main valve plug 3 is epicoele 34, is provided with Returnning spring 64 in epicoele 34, and one end of Returnning spring 64 contacts with main valve plug 3 and connects, and the other end is connected with the valve body contact of main valve opening device A.The bottom of main valve plug 3 is the tubular of lower ending opening, its opening is communicated with the low pressure oil outlet 67 on main valve, multiple through hole is circumferentially provided with at the barrel of main valve plug 3 bottom, main valve sleeve 35 also arranges multiple through hole in a circumferential direction, and hydraulic oil flows to low pressure oil outlet 67 from the opening of the through hole of high pressure filler opening 66 through main valve sleeve 35, the through hole on main valve plug 3, main valve plug 3 lower end.Main valve plug 3 moving axially in main valve sleeve 35 makes the through hole on primary spools 3 and the through hole generation variations in skews on main valve sleeve 35, causes the pressure changing low pressure oil outlet from high pressure filler opening to the change of the valve port opening of low pressure oil outlet.As shown in Figure 2 and Figure 3, main valve opening device A comprises valve body, valve body is formed by valve pocket 12 and at the plug screw 11 that valve pocket 12 left end is spirally connected, in valve body, be provided with valve pocket, sliding in valve pocket and establish a pilot valve, is wherein the first cavity volume 21 in the left side of pilot valve, right side is the second cavity volume 22, pilot valve comprises guide valve core 4 and guide valve seat 5, and oil circuit 44 between the chamber that guide valve core 4 is provided with connection first cavity volume 21 and the second cavity volume 22, between chamber, oil circuit 44 is provided with pilot valve throttle orifice 46.The diameter that left section of diameter of guide valve seat 5 is greater than right section, valve pocket also has corresponding size diameter section, the size diameter section of guide valve seat 5 respectively with the slippery conjunction of size diameter section of valve pocket, make the hydraulic oil in the first cavity volume 21 act on pilot valve axially effectively lifting surface area be greater than hydraulic oil in the second cavity volume 22 and act on axially effective lifting surface area on pilot valve.The pilot valve hole axially running through guide valve seat 5 is established at the center of guide valve seat 5, guide valve core 4 is slidedly arranged in pilot valve hole, guide valve core 4 comprises the guide portion 41 of its head, the tapering 42 of afterbody, the middle joint 43 connecting guide portion 41 and tapering 42, pilot valve gap 45 is had between the hole wall in joint 43 and pilot valve hole, tapering 42 is positioned at the first cavity volume 21, tapering 42 can contact to be formed to seal with guide valve seat point limit and contact, the inwall sliding fit in guide portion 41 and pilot valve hole.In the first cavity volume, establish damping spring 23, one end of damping spring 23 contacts with plug screw 11 and connects, and the other end contacts with the tapering 42 of guide valve core 4 and connects.Guide valve seat is provided with the radial direction through hole 51 being communicated with pilot valve gap 45; On valve pocket 12, pilot valve filler opening 13, pilot valve oil outlet 14, oil pressure detect oil circuit entrance 17, and wherein the first cavity volume 21 is communicated with epicoele 34 by pilot valve filler opening 13, and pilot valve oil outlet 14 to reflux with the fuel tank in hydraulic system through pilot valve overflow oil circuit 65 and is communicated with.Oil pressure detects oil circuit entrance 17 and is communicated with low pressure oil outlet 67 through main valve oil pressure detection oil circuit 62, detects on oil circuit 62 be provided with main valve throttle orifice 31 at main valve oil pressure.Pressure adjusting spring 24 is provided with in the second cavity volume 6, one end of pressure adjusting spring 24 contacts with guide valve seat 5 and connects, the other end contacts with valve pocket 12 and connects, adjustable lever 8 is provided with in the middle of pressure adjusting spring 24, one end of adjustable lever 8 is the spacing adjustable side contacted with the termination of the guide portion 41 of guide valve core 4, one end is provided with screw thread in addition, threaded end and valve pocket 12 are formed and are threaded and reach the outside of valve pocket 12, the end face of threaded end is provided with interior hexagonal counterbore 84, for use apparatus rotation adjusting lever 8, and establish fastening screw nut 9 to prevent the improper rotation of adjustable lever at the threaded end of adjustable lever 8.The end face of the spacing adjustable side of adjustable lever 8 is provided with counterbore 81, side is provided with the radial perforation 82 running through counterbore 81 sidewall, and when the spacing adjustable side of adjustable lever 8 is contacted with guide valve core 4, the second cavity volume 22 is communicated with oil circuit between chamber 44 by radial perforation 82, counterbore 81.
In the present embodiment, the cracking pressure of pilot valve in the pressure at low pressure oil outlet 67 place is lower than reduction valve, also when the pressure namely in the first cavity volume is lower than pilot valve cracking pressure, at damping spring 23 with under the effect of pressure adjusting spring 24, tapering 42 contacts to be formed to seal with guide valve seat point limit and contacts, pilot valve is in closed condition, and main valve plug 3 is in a certain position under the effect of Returnning spring 64 and hydraulic oil, makes valve port opening keep certain value.After the pressure at low pressure oil outlet 67 place raises, also be after the hydraulic fluid pressure rising in the first cavity volume 21, the active force acted on the left of pilot valve is greater than the active force acted on the right side of pilot valve, pilot valve moves right, when guide valve core 4 contacts with adjustable lever 8, pressure in first cavity volume 21 equals the cracking pressure of pilot valve, if when the pressure in the first cavity volume 21 is higher than this cracking pressure, guide valve core 4 stops mobile, guide valve seat 5 continues to move right, now the tapering 42 of guide valve core 4 disengages with guide valve seat point limit, first cavity volume 21 is communicated with pilot valve gap 45, hydraulic oil in first cavity volume 21 is by pilot valve gap 45, radial direction through hole 51, pilot valve oil outlet 14, pilot valve overflow oil circuit 65 enters fuel tank, the pressure in the first cavity volume 21 and the pressure in epicoele 34 is caused to reduce rapidly, due to the damping function of main valve throttle orifice 31, pressure in first cavity volume is lower than the pressure at low pressure oil outlet 67 place, pressure in epicoele is also lower than the pressure at low pressure oil outlet 67 place, main valve plug 3 moves to epicoele 34 direction under the effect of the pressure difference of its both sides, the degree of misalignment of through hole on the through hole on main valve plug 3 and main valve sleeve 35 is aggravated, also namely valve port opening is reduced, the pressure at low pressure oil outlet 66 place is reduced.
When the cracking pressure of the pressure in the first cavity volume 21 lower than pilot valve, the active force acted on the right side of pilot valve is greater than the active force acting on pilot valve upper left side, guide valve seat 5 is moved to the left under the promotion of pressure adjusting spring 24, guide valve seat point limit is contacted with tapering 42 connect, disconnect the oil circuit in the first cavity volume 21 to pilot valve gap 45, make the pressure in the first cavity volume 21 be promoted and the active force of the pilot valve left and right sides is balanced.Pressure in epicoele 34 also raises, and main valve plug again reaches stress balance and keeps current location, keeps the valve port opening from high pressure filler opening to low pressure oil outlet, also namely keeps the pressure of low pressure oil outlet.When the guide valve seat point limit of guide valve seat 5 contacts with tapering 42, guide valve core 4 is moved to the left the impact of snubber guide valve seat 5 under the effect of damping spring 23, reduce the percussion of guide valve seat 5, in the process that pilot valve cuts out, guide valve seat 5 is moved to the left, the volume of the second cavity volume 22 is caused to increase, hydraulic oil is entered by oil circuit between chamber 44 and enters into the second cavity volume 22 from the first cavity volume 21, due to the damping function of the pilot valve throttle orifice 46 on oil circuit between chamber 44, the inflow of hydraulic oil can be slowed down, also the travelling speed of guide valve seat 5 can be slowed down, thus the impact of guide valve seat to guide valve core can be reduced further, extend the working life of pilot valve.Guide valve core 4 is due to the leading role of guide portion 41, and radial offset collisions can not occur between guide valve core 4 and guide valve seat 5 and produce noise, the reduction valve operational noise therefore in the present embodiment is little.The position of the spacing adjustable side of adjustable lever 8 is changed in the present embodiment by using instrument rotation adjusting lever 8, when guide valve core 4 contacts with adjustable lever 8 in the present invention, pilot valve is opened, spacing adjustable side is in different positions, when guide valve core 4 contacts with adjustable lever 8, the reduction length of guide valve seat 5 pairs of pressure adjusting springs 24 is different, also namely there is different cracking pressures, such as when rotation adjusting lever 8 makes adjustable lever move right, pilot valve moves right under the effect of hydraulic oil, when guide valve core 4 contacts with adjustable lever 8, pressure adjusting spring 24 is increased by reduction length, therefore namely the cracking pressure of pilot valve also increases, in like manner, when rotation adjusting lever makes the spacing adjustable side of adjustable lever 8 be moved to the left, during contact with adjustable lever 8 of guide valve core 4, pressure adjusting spring 24 is reduced by reduction length and cracking pressure is reduced, therefore this enforcement is by the cracking pressure of the conveniently adjusted pilot valve of rotary nut 9, realize the pressure regulating reduction valve low pressure oil outlet 66 place.
Embodiment 2:
As shown in Figure 5, compared with embodiment 1, the difference of the guide's reduction valve in the present embodiment is the structure of controlling device and main valve, in the present embodiment, the end face of the spacing adjustable side of adjustable lever 8 has end face oil groove 83, and guide valve core 4 to be contacted when connecting oil circuit between chamber and is communicated with the second cavity volume by end face oil groove 83 with adjustable lever 8.The other end of adjustable lever 8 contacts with nut 9 through the adjustable lever mounting hole on valve pocket 12 and connects, and nut 9 is positioned at the outside of adjustable lever mounting hole and is spirally connected with valve pocket 12, and the place of being spirally connected is provided with fastening screw nut 91 prevents the improper movement of nut 9.On main valve, main valve throttle orifice 31 is arranged on main valve plug 3, epicoele 34 is communicated with low pressure oil outlet 67 by main valve throttle orifice 31, pilot valve filler opening 13, epicoele 34, main valve throttle orifice 31 form connection first cavity volume 21 and detect oil circuit with the oil pressure of low pressure oil outlet 67, and when pilot valve cuts out, the first cavity volume 21, epicoele 34 have identical pressure with low pressure oil outlet 67 place.
Embodiment 3:
As shown in Figure 6, compared with embodiment 2, the difference of the guide's reduction valve in the present embodiment is valve body and the guide valve seat 5 of main valve opening device A, in the present embodiment, valve body is made up of valve seat 15 and valve pocket 12 bolt, and left section of guide valve seat 5 coordinates with the intracavity sidewall of valve seat 15, and pilot valve filler opening 13 and pilot valve oil outlet 14 arrange on valve seat 15 on record, epicoele 34 is communicated with the first cavity volume 21 by pilot valve filler opening 13, and pilot valve oil outlet 14 is communicated with pilot valve overflow oil circuit 65 and radial direction through hole 51.The right side of guide valve seat 5 is provided with cavity, the sidewall of cavity and the side sliding fit of adjustable lever 8 and between pilot valve and adjustable lever 8, form the second cavity volume 22, wherein adjustable lever 8 and the diameter of guide valve seat 5 cooperation place are less than the diameter of left section of guide valve seat 5 and valve seat 15 intracavity sidewall cooperation place.
Embodiment 4:
As shown in Figure 7, compared with embodiment 3, the difference of the guide's reduction valve in the present embodiment is in the formation of adjustable lever 8, in the present embodiment, adjustable lever comprises two sections, the first spacing section 85 of coordinating with guide valve seat 5, another section is the adjustment section 86 with adjustable lever mounting hole sliding fit on valve pocket 12, be provided with spherojoint 87 regulating the termination of section to contact with spacing section 85 and connect, allow to regulate section 86 to rotate within the scope of several angle with spacing section 85, valve seat 15 inner chamber can be reduced like this, guide valve seat 5 and adjustable lever 8, the coaxality requirement of adjustable lever mounting hole, reduce difficulty of processing, prevent from guide valve seat 5 to be conditioned bar to block.
Embodiment 5:
As shown in Figure 8, compared with embodiment 2, the difference of the guide's reduction valve in the present embodiment is: the spacing shoulder 16 being provided with annular on the sidewall of the first cavity volume 21, the afterbody of guide valve core 4 is provided with spacing preiection 47, when guide valve core 4 moves right, spacing preiection 47 can contact with spacing shoulder 16, thus the stroke end position to the right of restriction guide valve core 4, in the second cavity volume 22, pressure adjusting spring 24 contacts with adjustable lever 8 and connects, regulate the pretension elastic force of pressure adjusting spring 24 by rotary nut 9 and realize the adjustment of different cracking pressure, in the present embodiment, spacing preiection 47 contacts pilot valve when rear guide valve seat 5 continues to move right and opens with spacing shoulder 16.
Claims (10)
1. an adjustable pilot reduction valve, the main valve opening device (A) comprising main valve (B) and be fixedly connected with main valve, described main valve (B) comprises main valve body (61), and main valve body (61) is provided with main valve plug chamber, high pressure filler opening (66), low pressure oil outlet (67), arranging in main valve plug chamber can the main valve plug (3) of movement vertically wherein, one end of main valve plug (3) is connected with Returnning spring (64), described main valve plug (3) is provided with the epicoele (34) adjacent with main valve plug (3) in the same side of Returnning spring (64), described main valve plug (3) moves along main valve plug axial direction along with it and changes the valve port opening from high pressure filler opening (66) to low pressure oil outlet (67) in main valve plug chamber, it is characterized in that, described main valve opening device (A) comprises a valve body, a valve pocket is established in valve body, slide in valve pocket and establish a pilot valve, the side of pilot valve is the first cavity volume (21), opposite side has the second cavity volume (22), first cavity volume (21) is communicated with epicoele (34), first cavity volume (21) detects oil circuit by oil pressure and is communicated with low pressure oil outlet (67), detect on oil circuit at oil pressure and be provided with main valve throttle orifice (31), the axial area of first cavity volume (21) interior liquid effects on pilot valve is greater than the axial area of liquid effects on pilot valve in the second cavity volume (22), oil circuit (44) between the chamber being provided with connection first cavity volume (21) and the second cavity volume (22) in pilot valve, described pilot valve comprises guide valve core (4) and guide valve seat (5), described guide valve seat (5) and valve pocket sidewall sliding fit, guide valve seat (5) is provided with the pilot valve hole of an axial through guide valve seat, described guide valve core (4) comprises the guide portion (41) of head, the tapering (42) of afterbody, connect the joint (43) of guide portion (41) and tapering (42), described guide portion (41) and described pilot valve hole sliding fit, there is between described joint (43) and pilot valve hole hole wall pilot valve gap (45), described tapering (42) is positioned at the first cavity volume (21), when tapering (42) disengages with guide valve seat point limit, the first cavity volume (21) is communicated with pilot valve gap (45), guide valve seat (5) is provided with the radial direction through hole (51) being communicated with pilot valve gap (45), valve body is provided with the pilot valve oil outlet (14) being communicated with radial direction through hole (51), damping spring (23) is provided with in described first cavity volume (21), one end of described damping spring (23) is connected with valve body contact, the other end is connected with the taper contact of guide valve core, pressure adjusting spring (24) and controlling device is established in the second cavity volume (22) side, one end of described pressure adjusting spring (24) contacts with guide valve seat (5) and connects, the other end is connected with valve body contact, described controlling device makes guide valve core (4) be less than guide valve seat (5) to the second cavity volume (22) direction shift motion to the shift motion in the second cavity volume (22) direction to regulate guide valve core (4) stroke end position.
2. adjustable pilot reduction valve according to claim 1, is characterized in that, between described chamber, oil circuit (44) is provided with pilot valve throttle orifice (46).
3. adjustable pilot reduction valve according to claim 1, it is characterized in that, described controlling device comprises adjustable lever (8), one end of described adjustable lever (8) contacts with the guide portion of guide valve core (41) termination the spacing adjustable side connected, and the other end is the connecting end be connected with valve body by screw mechanism.
4. adjustable pilot reduction valve according to claim 3, it is characterized in that, described screw mechanism comprises the adjustable lever mounting hole that is arranged on connecting valve inside and outside on valve body and is arranged on the regulating nut (9) be spirally connected with valve body outside mounting hole, and the connecting end of described adjustable lever (8) contacts with mounting hole sliding fit and with regulating nut (9) and connects.
5. adjustable pilot reduction valve according to claim 3, it is characterized in that, described screw mechanism comprises the adjustable lever mounting hole being arranged on connecting valve inside and outside on valve body, the connecting end of described adjustable lever (8) is arranged in mounting hole, connecting end and the mounting hole hole wall of adjustable lever (8) are provided with the screw thread cooperatively interacted, and the end face of adjustable lever connecting end is provided with inner hexagonal hole (84).
6. adjustable pilot reduction valve according to claim 3, it is characterized in that, the end face of the contiguous controlling device of described guide valve seat is provided with a cavity, and the sidewall of described cavity and the side-fit of described adjustable lever (8) form described second cavity volume (22).
7. adjustable pilot reduction valve according to any one of claim 1 to 6, is characterized in that, between described chamber, oil circuit (44) is arranged on guide valve seat.
8. the adjustable pilot reduction valve according to any one of claim 3 to 6, it is characterized in that, between described chamber, oil circuit (44) arranges on guide valve core, and described adjustable lever is provided with the logical oily passage flowed out from the inflow of spacing adjustable side end face, adjustable lever side.
9. an adjustable pilot reduction valve, the main valve opening device (A) comprising main valve (B) and be fixedly connected with main valve, described main valve (B) comprises main valve body (61), and main valve body (61) is provided with main valve plug chamber, high pressure filler opening (66), low pressure oil outlet (67), arranging in main valve plug chamber can the main valve plug (3) of movement vertically wherein, one end of main valve plug (3) is connected with Returnning spring (64), described main valve plug (3) is provided with the epicoele (34) adjacent with main valve plug (3) in the same side of Returnning spring (64), described main valve plug (3) moves along main valve plug axial direction along with it and changes the valve port opening from high pressure filler opening (66) to low pressure oil outlet (67) in main valve plug chamber, it is characterized in that, described main valve opening device (A) comprises a valve body, a valve pocket is established in valve body, slide in valve pocket and establish a pilot valve, the side of pilot valve is the first cavity volume (21), opposite side has the second cavity volume (22), first cavity volume (21) is communicated with epicoele (34), first cavity volume (21) detects oil circuit by oil pressure and is communicated with low pressure oil outlet (67), detect on oil circuit at oil pressure and be provided with main valve throttle orifice (31), the axial area of first cavity volume (21) interior liquid effects on pilot valve is greater than the axial area of liquid effects on pilot valve in the second cavity volume (22), oil circuit (44) between the chamber being provided with connection first cavity volume (21) and the second cavity volume (22) in pilot valve, described pilot valve comprises guide valve core (4) and guide valve seat (5), described guide valve seat (5) and valve pocket sidewall sliding fit, guide valve seat (5) is provided with the pilot valve hole of an axial through guide valve seat, described guide valve core (4) comprises the guide portion (41) of head, the tapering (42) of afterbody, connect the joint (43) of guide portion (41) and tapering (42), described guide portion (41) and described pilot valve hole sliding fit, there is between described joint (43) and pilot valve hole hole wall pilot valve gap (45), described tapering (42) is positioned at the first cavity volume (21), when tapering (42) disengages with guide valve seat point limit, the first cavity volume (21) is communicated with pilot valve gap (45), guide valve seat (5) is provided with the radial direction through hole (51) being communicated with pilot valve gap (45), valve body is provided with the pilot valve oil outlet (14) being communicated with radial direction through hole (51), be provided with damping spring (23) in described first cavity volume (21), one end of described damping spring (23) is connected with valve body contact, and the other end is connected with the taper contact of guide valve core, pressure adjusting spring (24) and adjustable diameter and screw adjusting mechanism is provided with in the second cavity volume (22) side, one end of described pressure adjusting spring (24) contacts with guide valve seat (5) and connects, the other end is connected with adjustable diameter and screw adjusting mechanism and is regulated the pretension elastic force of pressure adjusting spring (24) by adjustable diameter and screw adjusting mechanism, the sidewall of the first cavity volume (21) is provided with spacing shoulder (16), is provided with in the tapering (42) of guide valve core and limits the spacing preiection (47) of guide valve core to the second cavity volume direction shift motion with spacing shoulder (16) Corresponding matching.
10. adjustable pilot reduction valve according to claim 9, it is characterized in that, adjustable diameter and screw adjusting mechanism comprises adjustable lever (8), arrange on valve body and be used for the pilot hole of adjustable lever (8) sliding fit, be arranged on the nut (9) be connected with valve body screw thread outside pilot hole, the inner end of described adjustable lever (8) contacts with pressure adjusting spring (24) and connects, and outer end contacts with nut (9) and connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110367759.XA CN103122883B (en) | 2011-11-18 | 2011-11-18 | Adjustable pilot reduction valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110367759.XA CN103122883B (en) | 2011-11-18 | 2011-11-18 | Adjustable pilot reduction valve |
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| Publication Number | Publication Date |
|---|---|
| CN103122883A CN103122883A (en) | 2013-05-29 |
| CN103122883B true CN103122883B (en) | 2015-09-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110367759.XA Active CN103122883B (en) | 2011-11-18 | 2011-11-18 | Adjustable pilot reduction valve |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107289174B (en) * | 2016-04-01 | 2020-10-16 | 浙江盾安机械有限公司 | Electromagnetic valve |
| CN108087364B (en) * | 2017-12-19 | 2024-03-19 | 番禺珠江钢管（珠海）有限公司 | Double-pressure unloading valve |
| CN108506261B (en) * | 2018-04-11 | 2020-09-11 | 上海舜诺机械有限公司 | Pressure regulating method based on valve device |
| CN116181940B (en) * | 2023-04-26 | 2023-07-07 | 青岛开元阀门有限公司 | Air pressure reducing valve for ship |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1465798A (en) * | 1973-05-21 | 1977-03-02 | Bennes Marrel | Safety valve |
| CN1040420A (en) * | 1989-05-19 | 1990-03-14 | 刘长年 | Multifunctional floating pressure control valve |
| CN201144914Y (en) * | 2007-12-29 | 2008-11-05 | 上海立新液压有限公司 | Pilot type pressure reducing valve |
| CN201209603Y (en) * | 2008-02-01 | 2009-03-18 | 上海立新液压有限公司 | Guiding sequence valve |
| DE102008044800A1 (en) * | 2008-08-28 | 2010-03-04 | Robert Bosch Gmbh | Pilot-controlled pressure control valve, particularly pressure shut-off valve, pressure relief valve or pressure reducing valve, comprises master valve with master piston and pilot valve, where master piston is pre-stressed by spring |
-
2011
- 2011-11-18 CN CN201110367759.XA patent/CN103122883B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1465798A (en) * | 1973-05-21 | 1977-03-02 | Bennes Marrel | Safety valve |
| CN1040420A (en) * | 1989-05-19 | 1990-03-14 | 刘长年 | Multifunctional floating pressure control valve |
| CN201144914Y (en) * | 2007-12-29 | 2008-11-05 | 上海立新液压有限公司 | Pilot type pressure reducing valve |
| CN201209603Y (en) * | 2008-02-01 | 2009-03-18 | 上海立新液压有限公司 | Guiding sequence valve |
| DE102008044800A1 (en) * | 2008-08-28 | 2010-03-04 | Robert Bosch Gmbh | Pilot-controlled pressure control valve, particularly pressure shut-off valve, pressure relief valve or pressure reducing valve, comprises master valve with master piston and pilot valve, where master piston is pre-stressed by spring |
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| Publication number | Publication date |
|---|---|
| CN103122883A (en) | 2013-05-29 |
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