CN103122884B - Adjustable pilot overflow valve - Google Patents
Adjustable pilot overflow valve Download PDFInfo
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- CN103122884B CN103122884B CN201110367760.2A CN201110367760A CN103122884B CN 103122884 B CN103122884 B CN 103122884B CN 201110367760 A CN201110367760 A CN 201110367760A CN 103122884 B CN103122884 B CN 103122884B
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Abstract
The present invention discloses a kind of adjustable pilot overflow valve, to be hit fragile and that noise is large shortcoming for solving opening device in existing relief valve, the invention provides a kind of relief 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, its 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 making guide valve core be in steady state all the time, the pilot valve realizing this relief valve impacts little, life-span long, stable and advantage of low, the easy adjustment of noise.
Description
Technical field
The present invention relates to the adjustable pilot overflow valve in the hydraulic element of hydraulic system, particularly hydraulic system.
Technical background
Relief valve is pressure control valve conventional in hydraulic system, can be used as level pressure relief valve or safety valve.Relief valve is used in Stress control aspect usually, and existing relief valve is different with working principle by structure, can be divided into direct-acting overflow valve and pilot operated compound relief valve.Although direct-acting overflow valve has, structure is simple, sensitivity advantages of higher, and pressure is subject to the impact of spillway discharge change comparatively greatly, and override pressure is large, during high pressure, requires that pressure adjusting spring has very high rigidity.Pilot operated compound relief valve overcomes the shortcoming of direct-acting overflow valve, can the constant pressure of each relevant oil circuit of keeping system or overload protection, and has the features such as through-current capability is strong, range of regulation is wide, open and shut characteristic is good, is extremely important pressure valve member in hydraulic system.
At the hydraulic pressure that existing relief valve uses a kind of pilot valve to come in controlling water kick valve main valve plug Returnning spring chamber, open main valve plug by the hydraulic pressure reduced in main valve plug Returnning spring chamber.But in existing relief valve, guide valve seat maintains static, guide valve core to be positioned in the valve opening of guide valve seat by the column register pin at its top and with valve opening for interval coordinates, this structure utilizes pressure adjusting spring to balance the active force of hydraulic oil suffered by guide valve core, therefore requires that the rigidity of pressure adjusting spring is very high.Relief valve frequently opens and closes along with the pressure surge in hydraulic system, and guide valve core and guide valve seat also just open and close continually.Due to fixed during guide valve seat in existing relief valve, this just causes producing very large impact between the valve opening point limit of pilot valve guide valve core and guide valve seat when opening and closing, make pilot valve cause damage in certain operating time internal cause impact force, reduce relief valve working life; And pilot valve is when opening, guide valve core is in quick condition in the valve opening of guide valve seat, guide valve core usually can depart from center, guide valve core and valve opening are collided mutually, produce vibration and produce noise, even produce phenomenon of uttering long and high-pitched sounds, increase the noise radiation of machine, be difficult to the requirement meeting construction machinery hydraulic system.Therefore, this just needs to design and impacts little between pilot valve spool and guide valve seat, and good stability, noise is little, the relief valve of long service life.
Summary of the invention
The object of the invention is to for the pilot valve of existing pilot operated compound relief valve 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 overflow valve that the oil pressure relief of long service life is adjustable.
Technological scheme of the present invention is achieved in that a kind of adjustable pilot overflow 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, oil spilling mouth, main valve filler opening; Arranging in main valve plug chamber can the main valve plug of movement vertically wherein, one end of main valve plug is provided with Returnning spring, main valve filler opening can be communicated with oil spilling mouth when it moves axially or close by the other end, 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.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 main valve filler opening, 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 the sharp limit of guide valve seat, 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 overflow valve of the present invention is as follows: when the pressure at main valve filler opening place is not higher than relief valve cracking pressure, first cavity volume of pilot valve, the epicoele of main valve have identical pressure with filler opening place, main valve plug contacts with the sealing of main valve point limit under the effect of Returnning spring, closes from main valve filler opening to the oil circuit of oil spilling mouth.When the pressure of main valve filler opening 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 the valve opening point limit of guide valve seat 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 control valve main valve plug be connected with the first cavity volume, make primary spools upwards cavity direction move and open relief valve, main valve filler opening is directly communicated with oil spilling mouth, hydraulic oil flows to oil spilling mouth from main valve filler opening and carries out overflow.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 valve opening point limit of guide valve seat and the tapering 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, thus the pressure also improved in the control valve main valve plug epicoele that is connected with the first cavity volume, primary spools is made to move under the effect of Returnning spring and close the oil circuit from main valve filler opening to oil spilling mouth.In the present invention, the stroke of guide valve core is regulated by controlling device, also namely regulate guide valve core when contact spacing with controlling device i.e. the reduction length that when pilot valve opens, pressure adjusting spring is compressed by guide valve seat, also namely regulate the cracking pressure of elastic force realization adjustment this opening device of pressure adjusting spring when pilot valve is opened.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 that can contact 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 overflow 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, oil spilling mouth, main valve filler opening; 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 filler opening can be communicated with oil spilling mouth when it moves axially or close by the other end, 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.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 main valve filler opening, 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 relief 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 overflow cracking pressure realizing relief 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 overflow 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 relief valve cracking pressure and using process.
Accompanying drawing explanation
Fig. 1 is the structural representation of adjustable pilot overflow valve in the embodiment of the present invention 1;
Fig. 2 is the structural representation of main valve opening device in adjustable pilot overflow 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 overflow valve in the embodiment of the present invention 2;
Fig. 6 is the structural representation of adjustable pilot overflow valve in the embodiment of the present invention 3;
Fig. 7 is the structural representation of adjustable pilot overflow valve in the embodiment of the present invention 4;
Fig. 8 is the structural representation of adjustable pilot overflow valve in the embodiment of the present invention 5;
Fig. 9 is the structural representation of adjustable pilot overflow 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, main valve plug shoulder 32, main valve overflow oilhole 33, 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 chamber 63, Returnning spring 64, pilot valve overflow oil circuit 65, oil spilling mouth 66, main valve filler opening 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 overflow valve of the present invention is described.
Embodiment 1:
As shown in Figure 1, the main valve opening device A that adjustable pilot overflow 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, and main valve body 61 is provided with main valve plug chamber, oil spilling mouth 66, main valve filler opening 67; Arranging in main valve plug chamber can the main valve plug 3 of movement vertically wherein, the upside of main valve plug 3 is epicoele 34, Returnning spring 64 is provided with in epicoele 34, one end of Returnning spring 64 contacts with main valve plug 3 and connects, the other end is connected with the valve body contact of main valve opening device A, the normality of main valve plug 3 is under the effect of Returnning spring 64, close the oil circuit from main valve filler opening 67 to oil spilling mouth 66, when main valve plug 3 compression reseting spring 64 moves axially, main valve filler opening 67 is communicated with oil spilling mouth 66 and realizes overflow.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 the sharp limit of guide valve seat 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, wherein the first cavity volume 21 is communicated with epicoele 34 by pilot valve filler opening 13, pilot valve oil outlet 14 is communicated with oil spilling mouth 66 through pilot valve overflow oil circuit 65, oil pressure detects oil circuit entrance 17 and is communicated with main valve filler opening 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, 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, when the pressure at main valve filler opening 67 place is lower than the cracking pressure of relief 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 the sharp limit of guide valve seat and contacts, pilot valve is in closed condition, and main valve plug 3 is in closed condition under the effect of Returnning spring 64.After the pressure rising at main valve filler opening 67 place, 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 the sharp limit of guide valve seat, 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, main valve overflow oil circuit 65 flows to oil spilling mouth 66 and 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 main valve filler opening 67 place, pressure in epicoele is also lower than the pressure at main valve filler opening 67 place, main valve plug 3 moves to epicoele 34 direction under the effect of the pressure difference of its both sides, main valve filler opening 67 is directly communicated with oil spilling mouth 66 and realizes overflow.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, the sharp limit of guide valve seat 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 resets and closes from the oil circuit of main valve filler opening 67 to oil spilling mouth 66 under the effect of Returnning spring 64.When the sharp 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 relief 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 that regulation relief valve opens overflow.
Embodiment 2:
As shown in Figure 5, compared with embodiment 1, the difference of the precursor overflow 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 main valve filler opening 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 main valve filler opening 67, and when pilot valve cuts out, the first cavity volume 21, epicoele 34 have identical pressure with main valve filler opening 67 place.
Embodiment 3:
As shown in Figure 6, compared with embodiment 2, the difference of the precursor overflow 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 precursor overflow 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 precursor overflow valve valve in the present embodiment is main valve, main valve plug 3 is slidedly arranged in main valve body 61, main valve plug shoulder 32 in the middle part of main valve plug 3 and the sidewall sliding fit of main valve body inner chamber, the upper end of main valve plug 3 and main valve sleeve 35 sliding fit, main valve plug shoulder 32 underlying space is communicated with main valve filler opening 67, main valve plug shoulder 32 upper space forms epicoele 34, establishes main valve oil pressure to detect oil circuit 62 and be communicated with epicoele 34 by pilot valve filler opening 13 in main valve sleeve 35.The lower end of main valve plug 3 can be formed to seal with the sharp limit of main valve body 61 and contact, when main valve plug 3 moves up, main valve filler opening 67 is communicated with oil spilling mouth 66, and main valve plug 3 moves down the oil circuit sealing main valve filler opening 67 and oil spilling mouth 66 when contacting with the sharp limit of main valve body and closes.Main valve plug shoulder 32 is provided with the main valve throttle orifice 31 being communicated with top epicoele 34 and lower master valve filler opening 67.The upper end of main valve plug 3, main valve sleeve 35 and valve pocket 12 form the Returnning spring chamber 63 of main valve, Returnning spring 64 is established in Returnning spring chamber 63, Returnning spring chamber 63 is communicated with pilot valve oil outlet 14, establishes axial main valve overflow hydraulic fluid port 33 to be communicated with oil spilling mouth 66 in Returnning spring chamber 63 in main valve plug 3.When pilot valve is opened, the hydraulic oil in the first cavity volume 21 through pilot valve gap 45, radial direction through hole 51, pilot valve oil outlet 14, Returnning spring chamber 63, main valve overflow oilhole 33 enter fuel tank after flowing to oil spilling mouth 66.
Embodiment 6:
As shown in Figure 9, compared with embodiment 2, the difference of the precursor overflow 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 overflow 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, oil spilling mouth (66), main valve filler opening (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 provided with Returnning spring (64), main valve filler opening (67) can be communicated with oil spilling mouth (66) when it moves axially or close by the other end, 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), 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 main valve filler opening (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 (22) liquid effects on pilot valve in the second cavity volume, 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 the sharp limit of guide valve seat (5), 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 can to regulate guide valve core (4) stroke end position.
2. adjustable pilot overflow 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 overflow valve according to claim 1, it is characterized in that, described controlling device comprises adjustable lever (8), one end of described adjustable lever (8) can contact 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 overflow 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 overflow 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 overflow 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 overflow 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 overflow valve according to any one of claim 3 to 6, is characterized in that, between described chamber, oil circuit (44) arranges on guide valve core, and the spacing adjustable side of described adjustable lever is provided with the logical oily passage flowed out from end face inflow, side.
9. an adjustable pilot overflow 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, oil spilling mouth (66), main valve filler opening (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 provided with Returnning spring (64), main valve filler opening (67) can be communicated with oil spilling mouth (66) when it moves axially or close by the other end, 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), 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 main valve filler opening (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 (22) liquid effects on pilot valve in the second cavity volume, 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 the sharp limit of guide valve seat (5), 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 can be 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 method shift motion with spacing shoulder (16) Corresponding matching.
10. adjustable pilot overflow 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.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110367760.2A CN103122884B (en) | 2011-11-18 | 2011-11-18 | Adjustable pilot overflow valve |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110367760.2A CN103122884B (en) | 2011-11-18 | 2011-11-18 | Adjustable pilot overflow valve |
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| CN103122884A CN103122884A (en) | 2013-05-29 |
| CN103122884B true CN103122884B (en) | 2015-11-18 |
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| CN201110367760.2A Active CN103122884B (en) | 2011-11-18 | 2011-11-18 | Adjustable pilot overflow valve |
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| CN104100589B (en) * | 2014-07-04 | 2016-06-08 | 宁波江东晟创工业产品设计有限公司 | A kind of multidirectional and multifunctional pilot operated valve device fast |
| CN104454734B (en) * | 2014-12-01 | 2016-08-17 | 天津市通洁高压泵制造有限公司 | A kind of pressure adjustment relief valve |
| CN104613036B (en) * | 2015-01-20 | 2016-07-27 | 洛阳理工学院 | A kind of noise reduction overflow valve with balance liquid power and adjustable damping function |
| CN106438546B (en) * | 2016-10-20 | 2018-07-20 | 华侨大学 | A kind of voltage stabilizing pilot operated compound relief valve |
| CN107345533B (en) * | 2017-08-31 | 2023-12-08 | 江苏徐工工程机械研究院有限公司 | Overload oil supplementing valve and overload oil supplementing system |
| CN110966277A (en) * | 2018-09-30 | 2020-04-07 | 江苏凯亚环保科技有限公司 | Overflow valve |
| CN110469703B (en) * | 2019-08-12 | 2020-12-11 | 山东明源智能装备科技有限公司 | High-sensitivity pilot-operated overflow valve |
| CN110985729A (en) * | 2020-01-08 | 2020-04-10 | 兰州理工大学 | Ultrahigh pressure overflow valve |
| CN111539076B (en) * | 2020-04-02 | 2023-04-18 | 苏州萨伯工业设计有限公司 | Manufacturing control method for taper angle of inner conical surface of valve sleeve of threaded plug-in overflow 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 |
| CN114484027B (en) * | 2022-04-18 | 2022-06-21 | 东营市特种设备检验研究院 | Pressure reducing valve for industrial pipeline for petrochemical industry |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0513528A2 (en) * | 1991-05-14 | 1992-11-19 | Robert Bosch Gmbh | Pressure maintaining valve |
| CN201062598Y (en) * | 2007-07-11 | 2008-05-21 | 上海立新液压有限公司 | Pilot discharge 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 |
| CN202040135U (en) * | 2011-03-25 | 2011-11-16 | 南京梅山冶金发展有限公司 | Pilot valve adjusting device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09269835A (en) * | 1996-03-29 | 1997-10-14 | Osaka Gas Co Ltd | Pressure control valve |
-
2011
- 2011-11-18 CN CN201110367760.2A patent/CN103122884B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0513528A2 (en) * | 1991-05-14 | 1992-11-19 | Robert Bosch Gmbh | Pressure maintaining valve |
| CN201062598Y (en) * | 2007-07-11 | 2008-05-21 | 上海立新液压有限公司 | Pilot discharge 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 |
| CN202040135U (en) * | 2011-03-25 | 2011-11-16 | 南京梅山冶金发展有限公司 | Pilot valve adjusting device |
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| CN103122884A (en) | 2013-05-29 |
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