CN103122884A - Adjustable pilot overflow valve - Google Patents
Adjustable pilot overflow valve Download PDFInfo
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- CN103122884A CN103122884A CN2011103677602A CN201110367760A CN103122884A CN 103122884 A CN103122884 A CN 103122884A CN 2011103677602 A CN2011103677602 A CN 2011103677602A CN 201110367760 A CN201110367760 A CN 201110367760A CN 103122884 A CN103122884 A CN 103122884A
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Abstract
The invention discloses an adjustable pilot overflow valve. In order to overcome the defects that an opening device of an existing overflow valve is easy to damage when through impacts and noise is high, the invention provides a overflow valve, wherein a differential pilot valve is adopted, a first containing cavity communicated with an oil inlet of the pilot valve is formed in one side of the pilot valve, a second containing cavity communicated with the first containing cavity through an oil way is formed in the other side of the pilot valve, a pilot valve core is arranged inside a pilot valve seat in a sliding mode, a pyramid portion of the pilot valve core is located inside the first containing cavity and connected with a buffer spring, a pressure adjusting spring and a screw adjusting mechanism are arranged on one side of the second containing cavity, a gap between the pilot valve seat and the pilot valve core, a radial through hole and an oil outlet compose a leakage oil way opened by the pilot valve, and opening pressure is convenient to adjust through the screw adjusting mechanism. According to the adjustable pilot reducing valve, the differential pilot valve, the invert-installed pilot valve core, the pilot valve seat capable of moving along an axial direction and the pilot valve core are utilized to reduce impact force when the pilot valve is closed, the pilot valve core is enabled to be always in a stable state, so that the adjustable pilot overflow valve has the advantages of being small in pilot valve impact, long in service life, stable and low in noise and easy to adjust.
Description
Technical field
The present invention relates to the adjustable precursor overflow valve in the hydraulic element of hydraulic system, particularly hydraulic system.
Technical background
Relief valve is pressure control valve commonly used in hydraulic system, can be used as level pressure relief valve or safety valve.Relief valve is used in pressure 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 the advantages such as that direct-acting overflow valve has is simple in structure, sensitivity is high, pressure are subjected to impact that spillway discharge changes greatly, override pressure is large, during high pressure, requires pressure adjusting spring to have very high rigidity.Pilot operated compound relief valve has overcome the shortcoming of direct-acting overflow valve, constant pressure or overload protection that can each relevant oil circuit of keeping system, and have the characteristics such as through-current capability is strong, range of regulation is wide, open and shut characteristic is good, be extremely important pressure valve member in hydraulic system.
Come the hydraulic pressure in controlling water kick valve main valve plug Returnning spring chamber at existing relief valve with a kind of pilot valve, open main valve plug by the hydraulic pressure that reduces in main valve plug Returnning spring chamber.But in existing relief valve, guide valve seat is to maintain static, the column register pin of guide valve core by its top be positioned in the valve opening of guide valve seat and with valve opening for intermittently coordinating, this structure is to utilize pressure adjusting spring to come the active force of the suffered hydraulic oil of balance guide valve core, therefore requires the rigidity of pressure adjusting spring very high.Relief valve is frequent the open and close 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 the very large impact of generation 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 can usually depart from the center, guide valve core and valve opening are collided mutually, produce vibration and produce noise, even produce the phenomenon of uttering long and high-pitched sounds, increase the noise radiation of machine, be difficult to satisfy the requirement of construction machinery hydraulic system.Therefore, this just need to design between pilot valve spool and guide valve seat impact little, good stability, noise is little, the relief valve of long service life.
Summary of the invention
The object of the invention is to pilot valve for 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 the shortcoming that quick condition easily produces vibration and utters long and high-pitched sounds, and provide a kind of good stability, noise is little, the adjustable precursor 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 precursor overflow valve of structure, and it comprises main valve and the main valve opening device that is 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; The main valve plug that in the main valve plug chamber, setting can be moved therein vertically, one end of main valve plug is provided with Returnning spring, the other end can be communicated with the main valve filler opening or close with the oil spilling mouth when it moves axially, main valve plug is provided with the epicoele with the main valve plug adjacency in the same side of Returnning spring, epicoele is the control chamber that main valve plug is opened, when upper cavity pressure reduces certain value, being subjected to force unbalance of main valve plug both sides and upwards cavity direction move.the main valve opening device comprises a valve body, establish a valve pocket in valve body, the sliding pilot valve of establishing in valve pocket, one side of pilot valve is the first cavity volume, opposite side has the second cavity volume, the first cavity volume is communicated with epicoele, the first cavity volume detects oil circuit by oil pressure and is communicated with the main valve filler opening, detect on oil circuit at oil pressure and be provided with the main valve throttle orifice, , liquid effects acts on axial area on pilot valve in the axial area on pilot valve greater than the second intracavity liquid in the first cavity volume, be provided with oil circuit between the chamber that is communicated with the 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 one and axially connects the pilot valve hole of guide valve seat, guide valve core comprises the guide portion of head, the tapering of afterbody, the joint that connects guide portion and tapering, guide portion and described pilot valve hole sliding fit, has the pilot valve gap between joint and pilot valve hole hole wall, the tapering is positioned at the first cavity volume, when the tapering disengages with point limit, pilot valve hole, the first cavity volume is communicated with the pilot valve gap, guide valve seat is provided with the radial direction through hole that is communicated with the pilot valve gap, valve body is provided with the pilot valve oil outlet that is communicated with radial direction through hole, be provided with damping spring in the first cavity volume, one end of damping spring is connected with the valve body contact, the other end is connected with the tapering contact of guide valve core, the guide spool applies towards the elastic force of the second cavity volume direction, establish pressure adjusting spring and controlling device in the second cavity volume side, one end of pressure adjusting spring is connected with the guide valve seat contact, the contact of the other end and valve body is connected, controlling device make guide valve core to the shift motion of the second cavity volume direction less than guide valve seat to the second cavity volume direction shift motion and can regulate guide valve core stroke final position.
The working principle of the adjustable precursor overflow valve of the present invention is as follows: when the pressure at main valve filler opening place during not higher than the relief valve cracking pressure, the first cavity volume of pilot valve, the epicoele of main valve have identical pressure with the filler opening place, main valve plug is tactile with the sealing point edge joint of main valve 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 that is positioned at the first cavity volume due to pilot valve is positioned at the axially loaded area of the second cavity volume greater than pilot valve, the active force increase value that hydraulic oil in the first cavity volume acts on pilot valve acts on active force increase value on pilot valve greater than hydraulic oil in the second cavity volume, when the pressure in the first cavity volume reaches the set pressure of opening device, hydraulic oil in the first cavity volume and damping spring to the active force of pilot valve greater than hydraulic oil and the pressure adjusting spring active force to pilot valve in the second cavity volume, make pilot valve move (hydraulic oil of the second cavity volume also flows to the first cavity volume by oil circuit between the 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, the valve opening of the tapering of guide valve core and guide valve seat point limit disengages at this moment, the first cavity volume is communicated with the pilot valve gap, hydraulic oil in the first cavity volume is by the pilot valve gap, radial direction through hole, the pilot valve oil outlet flows out the first cavity volume, pressure in the first cavity volume is reduced rapidly, thereby reduce the interior pressure of epicoele of the control valve main valve plug that is connected with the first cavity volume, make the main valve plug cavity direction that makes progress move and open relief valve, the main valve filler opening directly is communicated with the oil spilling mouth, hydraulic oil flows to the oil spilling mouth from the main valve filler opening and carries out overflow.during the set pressure of closing to opening device when the pressure decreased in the first cavity volume, hydraulic oil in the first cavity volume and damping spring to the axial force of pilot valve less than hydraulic oil and the pressure adjusting spring axial force to pilot valve in the second cavity volume, guide valve seat moves to the first cavity volume direction under the effect of pressure adjusting spring, the valve opening point limit of guide valve seat is contacted with the conical surface in the tapering of guide valve core, disconnection is from the oil circuit in the first cavity volume and pilot valve gap, make the boost in pressure of the first cavity volume, thereby also improve the pressure in the control valve main valve plug epicoele that is connected with the first cavity volume, make main valve plug move under the effect of Returnning spring and close oil circuit from the main valve filler opening to the oil spilling mouth.In the present invention, regulate the stroke of guide valve core by controlling device, also namely regulate guide valve core and contact the reduction length that when namely pilot valve is opened when spacing, pressure adjusting spring is compressed by guide valve seat with controlling device, also namely regulate the cracking pressure that the elastic force of pressure adjusting spring when pilot valve is opened is realized this opening device of adjusting.The guide valve core of the pilot valve of the present invention by differential type, upside-down mounting is the measures such as the guide valve core side that is arranged on the pilot valve oil-feed, damping spring, axially movable guide valve seat and guide valve core impact forces when reducing pilot valve and closing, and make guide valve core be in all the time a steady state, impact the advantage little, that the life-span is long, noise is low to realize this pilot valve.
In the present invention, be provided with the pilot valve throttle orifice between the chamber on oil circuit, 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 the chamber from the first cavity volume, owing to being provided with throttle orifice on oil circuit between the chamber, the hydraulic oil that is by convection in the second cavity volume has damping function, therefore can slow down the speed that guide valve seat moves to the first cavity volume direction, thereby reduces the impact between guide valve seat and guide valve core.
In the present invention, controlling device comprises adjustable lever, and an end of adjustable lever is the spacing adjustable side that can contact with the guide portion termination of guide valve core, the connecting end that the other end is connected with valve body by screw mechanism.Regulate the position of the adjustable side of adjustable lever by screw mechanism and realize regulating stroke and the position that guide valve core contacts with adjustable lever.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 that the mounting hole outside and valve body are spirally connected, and the connecting end of adjustable lever contacts with regulating nut with mounting hole sliding fit and termination and is connected.By rotary nut, realize that adjustable lever slides and stroke and position when regulating guide valve core and contacting with adjustable lever in mounting hole.Screw mechanism can also be to comprise the adjustable lever mounting hole that is arranged on connecting valve inside and outside on valve body, the connecting end of adjustable lever is arranged in mounting hole, the connecting end of adjustable lever and mounting hole hole wall are provided with the screw thread that cooperatively interacts, and are provided with inner hexagonal hole on the end face of adjustable lever connecting end.
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 coordinates described the second cavity volume of formation with the side of adjustable lever.
In the present invention, between the chamber, oil circuit can be arranged on guide valve seat, also can be arranged on guide valve core, in the time of on being arranged on guide valve core, the spacing adjustable side of adjustable lever is provided with from the logical oily passage that end face flows into, flow out the side, when the contact of spacing adjustable side and guide valve core is connected, between the chamber, oil circuit can be communicated with the second cavity volume by leading to oily passage.Logical oil duct can be taked various ways, for example be provided with counterbore on the end face of spacing adjustable side, the side is provided with the perforation that runs through the counterbore sidewall, counterbore when guide valve core and the contact of spacing adjustable side are connected with the chamber between oil circuit be communicated with, the end face oil groove run through whole spacing adjustable side end face perhaps is set on the end face of spacing adjustable side, contacts in guide valve core and spacing adjustable side when being connected that between end face oil groove and chamber, oil circuit is communicated with.
The present invention provides another kind of technological scheme for solving its technical problem, this scheme is a kind of adjustable precursor overflow valve of structure, it comprises main valve and the main valve opening device that is 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; The main valve plug that in the main valve plug chamber, setting can be moved therein vertically, one end of main valve plug is connected with Returnning spring, the other end can be communicated with the main valve filler opening or close with the oil spilling mouth when it moves axially, main valve plug is provided with the epicoele with the main valve plug adjacency in the same side of Returnning spring, epicoele is the control chamber that main valve plug is opened, when upper cavity pressure reduces certain value, being subjected to force unbalance of main valve plug both sides and upwards cavity direction move.the main valve opening device comprises a valve body, establish a valve pocket in valve body, the sliding pilot valve of establishing in valve pocket, one side of pilot valve is the first cavity volume, opposite side has the second cavity volume, the first cavity volume is communicated with epicoele, the first cavity volume detects oil circuit by oil pressure and is communicated with the main valve filler opening, detect on oil circuit at oil pressure and be provided with the main valve throttle orifice, liquid effects acts on axial area on pilot valve in the axial area on pilot valve greater than the second intracavity liquid in the first cavity volume, be provided with oil circuit between the chamber that is communicated with the 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 one and axially connects the pilot valve hole of guide valve seat, described guide valve core comprises the guide portion of head, the tapering of afterbody, the joint that connects guide portion and tapering, described guide portion and described pilot valve hole sliding fit, has the pilot valve gap between described joint and pilot valve hole hole wall, described tapering is positioned at the first cavity volume, when the tapering disengages with point limit, pilot valve hole, the first cavity volume is communicated with the pilot valve gap, guide valve seat is provided with the radial direction through hole that is communicated with the pilot valve gap, valve body is provided with the pilot valve oil outlet that is communicated with radial direction through hole, be provided with damping spring in the first cavity volume, one end of damping spring is connected with the valve body contact, the other end is connected with the tapering contact of guide valve core, the guide spool applies towards the elastic force of the second cavity volume direction, be provided with pressure adjusting spring, adjustable diameter and screw adjusting mechanism in the second cavity volume side, one end of described pressure adjusting spring is connected with the guide valve seat contact, the other end is connected with adjustable diameter and screw adjusting mechanism and can be regulated by adjustable diameter and screw adjusting mechanism the pretension elastic force of pressure adjusting spring, be provided with spacing shoulder on the sidewall of the first cavity volume, be provided with the spacing preiection of spacing shoulder Corresponding matching in the tapering of guide valve core.When the relief valve in the present invention is worked, when the pressure in the first cavity volume during higher than the setting of pressure adjusting spring, the limit dais shoulder grafting of the positive stop lug boss in guide valve core tapering and the first cavity volume sidewall touches and makes guide valve core stop moving, guide valve seat continues mobile and causes pilot valve to be opened, and makes the pressure decreased in the first cavity volume.Can regulate the pressure that pilot valve is opened by the pretension elastic force of adjustable diameter and screw adjusting mechanism Regulation spring in the present invention, realize that the overflow cracking pressure of relief valve is regulated.
Adjustable diameter and screw adjusting mechanism comprises adjustable lever, is provided for the pilot hole of adjustable lever sliding fit on valve body, is arranged on the nut that the pilot hole outside is connected with valve body screw thread in the present invention, the inner end of described adjustable lever is connected with the pressure adjusting spring contact, and the outer end is connected with the nut contact.Adjustable diameter and screw adjusting mechanism can also be directly and the adjustable lever that is spirally connected of valve body in addition, and the inner end of adjustable lever contacts with pressure adjusting spring, and the outer end is positioned at outside valve body, available instrument rotary regulating lever.
The present invention compared with prior art has following beneficial effect:
1. in adjustable precursor overflow valve of the present invention, guide valve core and guide valve seat all can endwisely slip, and when pilot valve cut out, guide valve seat guide spool moved, and guide valve core is subjected to the effect of damping spring, the impact when the available buffer guide valve seat contacts with guide valve core; The present invention can make pilot valve be subjected to the lifting surface area of hydraulic oil axial action in the second cavity volume to be slightly less than the lifting surface area that pilot valve is subjected to hydraulic oil axial action in the first cavity volume by design in addition, thereby can select the less pressure adjusting spring of rigidity, the impact of guide valve seat and guide valve core when reducing the pilot valve open and close.The present invention by can axially movable guide valve seat, impact force when the reduction guide valve seat such as the buffering of guide valve core, damping spring and guide valve core are closed, thereby extend working life of pilot valve.
2. in the present invention, guide valve core is by its guide rod and valve opening sliding fit, it only can endwisely slipped along guide's valve opening, can not produce skew radially, when pilot valve was opened, an end of guide valve core was subjected to the extruding of damping spring in addition, the other end and controlling mechanism or limit dais shoulder grafting touch, make it be in a kind of steady state, even do not utter long and high-pitched sounds so can not produce vibration, can not increase the noise radiation of machine.
3. the stroke when regulating guide valve core and contact with controlling device by controlling device in the present invention and final position or the elastic force by adjustable diameter and screw adjusting mechanism Regulation spring are conveniently realized in the adjusting of this relief valve cracking pressure and using process the correction adjustment to cracking pressure.
Description of drawings
Fig. 1 is the structural representation of adjustable precursor overflow valve in the embodiment of the present invention 1;
Fig. 2 is the structural representation of main valve opening device in adjustable precursor 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 precursor overflow valve in the embodiment of the present invention 2;
Fig. 6 is the structural representation of adjustable precursor overflow valve in the embodiment of the present invention 3;
Fig. 7 is the structural representation of adjustable precursor overflow valve in the embodiment of the present invention 4;
Fig. 8 is the structural representation of adjustable precursor overflow valve in the embodiment of the present invention 5;
Fig. 9 is the structural representation of adjustable precursor 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, the 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 between guide valve core 4, guide portion 41, tapering 42, joint 43, chamber, pilot valve gap 45, pilot valve throttle orifice 46, spacing preiection 47;
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, regulate section 86, spherojoint 87;
9, nut 9, fastening screw nut 91.
Embodiment
Below in conjunction with drawings and Examples, the adjustable precursor overflow valve of the present invention is described.
Embodiment 1:
As shown in Figure 1, adjustable precursor overflow valve comprises main valve B and the main valve opening device A that is fixedly connected with main valve, and 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; The main valve plug 3 that in the main valve plug chamber, setting can be moved therein vertically, the upside of main valve plug 3 is epicoele 34, be provided with Returnning spring 64 in epicoele 34, one end of Returnning spring 64 is connected with main valve plug 3 contacts, 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 springs 64 moved axially, main valve filler opening 67 is communicated with oil spilling mouth 66 realized overflow.As Fig. 2 and shown in Figure 3, main valve opening device A comprises valve body, valve body reaches by valve pocket 12 plug screw 11 that is spirally connected at valve pocket 12 left ends and consists of, being provided with valve pocket in valve body, sliding in valve pocket and establish a pilot valve, is wherein the first cavity volume 21 in the left side of pilot valve, the right side is the second cavity volume 22, pilot valve comprises guide valve core 4 and guide valve seat 5, and guide valve core 4 is provided with oil circuit 44 between the chamber that connects the first cavity volume 21 and the second cavity volume 22, is provided with pilot valve throttle orifice 46 between the chamber on oil circuit 44.Left section diameter of guide valve seat 5 is greater than the diameter of right section, valve pocket also has corresponding size diameter section, the size diameter section of guide valve seat 5 respectively with slippery the closing of size diameter section of valve pocket, make hydraulic oil in the first cavity volume 21 act on pilot valve axially effectively lifting surface area act on axially effective lifting surface area on pilot valve greater than the second interior hydraulic oil of cavity volume 22.The pilot valve hole of 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 the pilot valve hole, guide valve core 4 comprises the guide portion 41 of its head, the tapering 42 of afterbody, the middle joint 43 that connects guide portion 41 and tapering 42, pilot valve gap 45 is arranged between the hole wall in joint 43 and pilot valve hole, tapering 42 is positioned at the first cavity volume 21, tapering 42 can be touched with the sharp edge joint in pilot valve hole and be formed sealing and contact, the inwall sliding fit in guide portion 41 and pilot valve hole.Establish damping spring 23 in the first cavity volume, an end of damping spring 23 is connected with plug screw 11 contacts, and the other end is connected with tapering 42 contacts of guide valve core 4.Be provided with the radial direction through hole 51 that is communicated with pilot valve gap 45 on guide valve seat; Pilot valve filler opening 13, pilot valve oil outlet 14, oil pressure detect oil circuit entrance 17 on valve pocket 12, wherein pilot valve filler opening 13 is communicated with the first cavity volume 21 with epicoele 34, 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 at the main valve oil pressure and is provided with main valve throttle orifice 31.be provided with pressure adjusting spring 24 in the second cavity volume 6, one end of pressure adjusting spring 24 is connected with guide valve seat 5 contacts, the other end is connected with valve pocket 12 contacts, be provided with adjustable lever 8 in the middle of pressure adjusting spring 24, one end of adjustable lever 8 is the spacing adjustable sides that contact with the termination of the guide portion 41 of guide valve core 4, an other end is provided with screw thread, threaded end forms with valve pocket 12 outside that is threaded and reaches valve pocket, be provided with interior hexagonal counterbore 84 on the end face of threaded end, for using apparatus rotation adjustable lever 8, and establish at the threaded end of adjustable lever 8 the improper rotation that fastening screw nut 9 prevents adjustable lever.Be provided with counterbore 81 on the end face of the spacing adjustable side of adjustable lever 8, the side is provided with the radial perforation 82 that runs through counterbore 81 sidewalls, and when making the spacing adjustable side of adjustable lever 8 contact with guide valve core 4, the second cavity volume 22 is communicated with by oil circuit 44 between radial perforation 82, counterbore 81 and chamber.
In the present embodiment, when the pressure at the main valve filler opening 67 places cracking pressure lower than relief valve, when also namely the pressure in the first cavity volume is lower than the pilot valve cracking pressure, under the effect of damping spring 23 and pressure adjusting spring 24, tapering 42 contacts with the tactile formation sealing of sharp edge joint in pilot valve hole, 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 at main valve filler opening 67 places raises, after also namely the first interior hydraulic fluid pressure of cavity volume 21 raises, act on the active force in pilot valve left side greater than the active force that acts on the pilot valve right side, pilot valve moves right, when guide valve core 4 contacts with adjustable lever 8, pressure in the first cavity volume 21 equals the cracking pressure of pilot valve, if the pressure in the first cavity volume 21 is during higher than this cracking pressure, guide valve core 4 stops mobile, guide valve seat 5 continues to move right, this moment, the tapering 42 of guide valve core 4 disengaged with point limit, pilot valve hole, make the first cavity volume 21 be communicated with pilot valve gap 45, hydraulic oil in the 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, cause pressure and epicoele 34 interior pressure in the first cavity volume 21 to reduce rapidly, damping function due to main valve throttle orifice 31, pressure in the first cavity volume is lower than the pressure at main valve filler opening 67 places, pressure in epicoele is also lower than the pressure at main valve filler opening 67 places, main valve plug 3 moves to epicoele 34 directions under the effect of the pressure difference of its both sides, main valve filler opening 67 directly is communicated with oil spilling mouth 66 realizes overflow.When the pressure in the first cavity volume 21 during lower than the cracking pressure of pilot valve, act on the active force on pilot valve right side greater than the active force that acts on the pilot valve upper left side, guide valve seat 5 is moved to the left under the promotion of pressure adjusting spring 24, make the sharp limit in pilot valve hole be connected with tapering 42 contacts, disconnect the first cavity volume 21 to the pilot valve gap 45 oil circuit, make pressure in the first cavity volume 21 be promoted and make the active force of the pilot valve left and right sides be able to balance.Pressure in epicoele 34 also raise, and main valve plug resets under the effect of Returnning spring 64 and closes oil circuit from main valve filler opening 67 to oil spilling mouth 66.when the point limit, pilot valve hole 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, cause the volume of the second cavity volume 22 to increase, hydraulic oil enters from the first cavity volume 21 by oil circuit between the chamber 44 and enters into the second cavity volume 22, damping function due to the pilot valve throttle orifice 46 on oil circuit between the chamber 44, can slow down the inflow of hydraulic oil, also can slow down the travelling speed of guide valve seat 5, thereby can further reduce guide valve seat to the impact of guide valve core, extend the working life of pilot valve.Guide valve core 4 offset collisions radially can not occur between guide valve core 4 and guide valve seat 5 and produce noise, so the relief valve operational noise in the present embodiment is little due to the leading role of guide portion 41.can rotate the position that adjustable lever 8 changes the spacing adjustable side of adjustable lever 8 by tool using in the present embodiment, 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 from adjustable lever 8, the reduction length of 5 pairs of pressure adjusting springs 24 of guide valve seat is different, also namely has different cracking pressures, for example when rotating adjustable lever 8, adjustable lever is moved right, pilot valve moves right under the effect of hydraulic oil, when guide valve core 4 contacts with adjustable lever 8, the compressed length of pressure adjusting spring 24 increases, therefore the cracking pressure of pilot valve also namely increases, in like manner, when the rotation adjustable lever is moved to the left the spacing adjustable side of adjustable lever 8, during the contacting of guide valve core 4 and adjustable lever 8, the compressed length of pressure adjusting spring 24 reduces and cracking pressure is reduced, therefore this enforcement can be by the cracking pressure of rotary nut 9 conveniently adjusted pilot valves, realize the pressure of regulation relief valve unlatching overflow.
Embodiment 2:
As shown in Figure 5, compare 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, when 8 contacts of guide valve core 4 and adjustable lever are connected between the chamber oil circuit pass through end face oil groove 83 and be communicated with the second cavity volume.Adjustable lever mounting hole and nut 9 contacts that the other end of adjustable lever 8 passes on valve pocket 12 are connected, 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 and prevents the improper movement of nut 9.On main valve, main valve throttle orifice 31 is arranged on main valve plug 3, main valve throttle orifice 31 is communicated with epicoele 34 and main valve filler opening 67, pilot valve filler opening 13, epicoele 34, main valve throttle orifice 31 consists of the oil pressure that is communicated with the first cavity volumes 21 and main valve filler opening 67 and detects oil circuit, and the first cavity volume 21 when pilot valve cuts out, epicoele 34 have identical pressure with main valve filler opening 67 places.
Embodiment 3:
As shown in Figure 6, compare 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 of valve seat 15 and valve pocket 12 bolts, and the left section intracavity sidewall with valve seat 15 of guide valve seat 5 coordinates, and pilot valve filler opening 13 arranges on valve seat 15 on record with pilot valve oil outlet 14, pilot valve filler opening 13 is communicated with epicoele 34 with the first cavity volume 21, 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 side sliding fit of the sidewall of cavity and adjustable lever 8 and form the second cavity volume 22 between pilot valve and adjustable lever 8, wherein the diameter of adjustable lever 8 and guide valve seat 5 cooperation places is less than the diameter of left section of guide valve seat 5 and valve seat 15 intracavity sidewall cooperation places.
Embodiment 4:
as shown in Figure 7, compare with embodiment 3, the difference of the precursor overflow valve in the present embodiment is on the formation of adjustable lever 8, in the present embodiment, adjustable lever comprises two sections, spacing section 85 of coordinating with guide valve seat 5 of the first, another section is to raise the adjusting section 86 of pole mounting hole sliding fit with valve pocket 12, be provided with spherojoint 87 is connected with spacing section 85 contact in the termination of regulating section, allowing to regulate section 86 rotates in the several angle scope with spacing section 85, can reduce like this valve seat 15 inner chambers, guide valve seat 5 and adjustable lever 8, the coaxality requirement of adjustable lever mounting hole, reduce difficulty of processing, prevent that guide valve seat 5 is conditioned bar and blocks.
Embodiment 5:
As shown in Figure 8, compare 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, the main valve plug shoulder 32 at main valve plug 3 middle parts 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 fits, 32 times side spaces of main valve plug shoulder are communicated with main valve filler opening 67, main valve plug shoulder 32 upper spaces consist of epicoele 34, establish the main valve oil pressure and detect oil circuit 62 with pilot valve filler opening 13 and epicoele 34 connections in main valve sleeve 35.The lower end of main valve plug 3 can form sealing 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 when contact with the sharp limit sealing of main valve body the oil circuit of main valve filler opening 67 and oil spilling mouth 66 and closes.Be provided with the main valve throttle orifice 31 that is communicated with top epicoele 34 and bottom main valve filler opening 67 on main valve plug shoulder 32.The upper end of main valve plug 3, main valve sleeve 35 and valve pocket 12 form the Returnning spring chamber 63 of main valves, establish Returnning spring 64 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 in main valve plug 3 Returnning spring chamber 63 is communicated with oil spilling mouth 66.When pilot valve is opened, the hydraulic oil in the first cavity volume 21 through the 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, compare with embodiment 2, the difference of the precursor overflow valve in the present embodiment is: the spacing shoulder 16 that is provided with annular on the sidewall of the first cavity volume 21, afterbody at 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, thereby the stroke final position to the right of restriction guide valve core 4, in the second cavity volume 22, pressure adjusting spring 24 is connected with adjustable lever 8 contacts, can realize by the pretension elastic force that rotary nut 9 is regulated pressure adjusting spring 24 adjusting of different cracking pressures, in the present embodiment, when after spacing preiection 47 contacts with spacing shoulder 16, guide valve seat 5 continues to move right, pilot valve is opened.
Claims (10)
1. adjustable precursor overflow valve, comprise main valve (B) and the main valve opening device (A) that is 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), the main valve plug (3) that in the main valve plug chamber, setting can be moved therein vertically, one end of main valve plug (3) is provided with Returnning spring (64), the other end can be communicated with main valve filler opening (67) or close with oil spilling mouth (66) when it moves axially, described main valve plug (3) is provided with the epicoele (34) with main valve plug (3) adjacency in the same side of Returnning spring (64), it is characterized in that, described main valve opening device (A) comprises a valve body, establish a valve pocket in valve body, the sliding pilot valve of establishing in valve pocket, one side of pilot valve is the first cavity volume (21), opposite side has the second cavity volume (22), the first cavity volume (21) is communicated with epicoele (34), the 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 the interior liquid effects of the first cavity volume (21) on pilot valve is greater than the axial area of (22) liquid effects on pilot valve in the second chamber, be provided with oil circuit (44) between the chamber that is communicated with the 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 one and axially connects the pilot valve hole of guide valve seat, described guide valve core (4) comprises the guide portion (41) of head, the tapering of afterbody (42), the joint (43) that connects guide portion (41) and tapering (42), described guide portion (41) and described pilot valve hole sliding fit, has pilot valve gap (45) between described joint (43) and pilot valve hole hole wall, described tapering (42) is positioned at the first cavity volume (21), when tapering (42) disengages with point limit, pilot valve hole, 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) that is communicated with pilot valve gap (45), valve body is provided with the pilot valve oil outlet (14) that is communicated with radial direction through hole (51), be provided with damping spring (23) in described the first cavity volume (21), one end of described damping spring (23) is connected with the valve body contact, the other end is connected with the tapering contact of guide valve core, establish pressure adjusting spring (24) and controlling device in the second cavity volume (22) side, one end of described pressure adjusting spring (24) is connected with guide valve seat (5) contact, the other end is connected with the valve body contact, described controlling device make guide valve core (4) to the shift motion of the second cavity volume (22) direction less than guide valve seat (5) to the second cavity volume (22) direction shift motion and can regulate guide valve core (4) stroke final position.
2. adjustable precursor overflow valve according to claim 1, is characterized in that, is provided with pilot valve throttle orifice (46) on oil circuit between described chamber (44).
3. adjustable precursor 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) is the spacing adjustable side that can be connected with guide portion (41) the termination contact of guide valve core, the connecting end that the other end is connected with valve body by screw mechanism.
4. adjustable precursor 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) that the mounting hole outside and valve body are spirally connected, and the connecting end of described adjustable lever (8) contacts with the mounting hole sliding fit and with regulating nut (9) and is connected.
5. adjustable precursor 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, 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 that cooperatively interacts, and are provided with inner hexagonal hole (84) on the end face of adjustable lever connecting end.
6. adjustable precursor overflow valve according to claim 3, 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 coordinates formation described the second cavity volume (22) with the side of described adjustable lever (8).
7. the described adjustable precursor overflow valve of any one according to claim 1 to 6, is characterized in that, oil circuit between described chamber (44) is arranged on guide valve seat.
8. the described adjustable precursor overflow valve of any one according to claim 3 to 6, is characterized in that, oil circuit between described chamber (44) arranges on guide valve core, and the spacing adjustable side of described adjustable lever is provided with from the logical oily passage that end face flows into, flow out the side.
9. adjustable precursor overflow valve, comprise main valve (B) and the main valve opening device (A) that is 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), the main valve plug (3) that in the main valve plug chamber, setting can be moved therein vertically, one end of main valve plug (3) is provided with Returnning spring (64), the other end can be communicated with main valve filler opening (67) or close with oil spilling mouth (66) when it moves axially, described main valve plug (3) is provided with the epicoele (34) with main valve plug (3) adjacency in the same side of Returnning spring (64), it is characterized in that, described main valve opening device (A) comprises a valve body, establish a valve pocket in valve body, the sliding pilot valve of establishing in valve pocket, one side of pilot valve is the first cavity volume (21), opposite side has the second cavity volume (22), the first cavity volume (21) is communicated with epicoele (34), the 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 the interior liquid effects of the first cavity volume (21) on pilot valve is greater than the axial area of (22) liquid effects on pilot valve in the second chamber, be provided with oil circuit (44) between the chamber that is communicated with the 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 one and axially connects the pilot valve hole of guide valve seat, described guide valve core (4) comprises the guide portion (41) of head, the tapering of afterbody (42), the joint (43) that connects guide portion (41) and tapering (42), described guide portion (41) and described pilot valve hole sliding fit, has pilot valve gap (45) between described joint (43) and pilot valve hole hole wall, described tapering (42) is positioned at the first cavity volume (21), when tapering (42) disengages with point limit, pilot valve hole, 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) that is communicated with pilot valve gap (45), valve body is provided with the pilot valve oil outlet (14) that is communicated with radial direction through hole (51), be provided with damping spring (23) in described the first cavity volume (21), an end of described damping spring (23) is connected with the valve body contact, and the other end is connected with the tapering contact of guide valve core, be provided with pressure adjusting spring (24) and adjustable diameter and screw adjusting mechanism in the second cavity volume (22) side, one end of described pressure adjusting spring (24) is connected with guide valve seat (5) contact, the other end is connected with adjustable diameter and screw adjusting mechanism and can be regulated by adjustable diameter and screw adjusting mechanism the pretension elastic force of pressure adjusting spring (24), be provided with spacing shoulder (16) on the sidewall of the first cavity volume (21), be provided with in the tapering (42) of guide valve core and the spacing preiection (47) of spacing shoulder (16) Corresponding matching restriction guide valve core to the second cavity volume method shift motion.
10. adjustable precursor overflow valve according to claim 9, it is characterized in that, adjustable diameter and screw adjusting mechanism comprises adjustable lever (8), be provided for the pilot hole of adjustable lever (8) sliding fit on valve body, be arranged on the nut (9) that the pilot hole outside is connected with valve body screw thread, the inner end of described adjustable lever (8) is connected with pressure adjusting spring (24) contact, and the outer end is connected with nut (9) contact.
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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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| CN201110367760.2A CN103122884B (en) | 2011-11-18 | 2011-11-18 | Adjustable pilot overflow valve |
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| CN103122884A true CN103122884A (en) | 2013-05-29 |
| CN103122884B CN103122884B (en) | 2015-11-18 |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104100589A (en) * | 2014-07-04 | 2014-10-15 | 宁波雪隆王液压科技有限公司 | Fast multi-direction multifunctional liquid control valve |
| CN104454734A (en) * | 2014-12-01 | 2015-03-25 | 天津市通洁高压泵制造有限公司 | Pressure-regulating overflow valve |
| CN104613036A (en) * | 2015-01-20 | 2015-05-13 | 洛阳理工学院 | Noise reduction overflow valve with hydrodynamic force balancing and adjustable damping functions |
| CN106438546A (en) * | 2016-10-20 | 2017-02-22 | 华侨大学 | Stable-pressure pilot overflow valve |
| CN107345533A (en) * | 2017-08-31 | 2017-11-14 | 徐工集团工程机械有限公司 | Overload oil compensating valve and overload oil-supplementing system |
| CN110469703A (en) * | 2019-08-12 | 2019-11-19 | 王平武 | A kind of high sensitivity pilot operated compound relief valve |
| CN110966277A (en) * | 2018-09-30 | 2020-04-07 | 江苏凯亚环保科技有限公司 | Overflow valve |
| CN110985729A (en) * | 2020-01-08 | 2020-04-10 | 兰州理工大学 | Ultrahigh pressure overflow valve |
| CN111539076A (en) * | 2020-04-02 | 2020-08-14 | 张祝 | Manufacturing control method for taper angle of inner conical surface of valve sleeve of threaded plug-in overflow valve |
| CN111692148A (en) * | 2020-04-30 | 2020-09-22 | 武汉船用机械有限责任公司 | Safety valve for hydraulic pump |
| CN114484027A (en) * | 2022-04-18 | 2022-05-13 | 东营市特种设备检验研究院 | Industrial pipeline pressure reducing valve for petrochemical industry |
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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 |
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| 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 |
| CN107345533A (en) * | 2017-08-31 | 2017-11-14 | 徐工集团工程机械有限公司 | Overload oil compensating 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 |
| CN110469703A (en) * | 2019-08-12 | 2019-11-19 | 王平武 | A kind of high sensitivity pilot operated compound relief valve |
| CN110985729A (en) * | 2020-01-08 | 2020-04-10 | 兰州理工大学 | Ultrahigh pressure overflow valve |
| CN111539076A (en) * | 2020-04-02 | 2020-08-14 | 张祝 | Manufacturing control method for taper angle of inner conical surface of valve sleeve of threaded plug-in 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 |
| CN111692148A (en) * | 2020-04-30 | 2020-09-22 | 武汉船用机械有限责任公司 | Safety valve for hydraulic pump |
| CN114484027A (en) * | 2022-04-18 | 2022-05-13 | 东营市特种设备检验研究院 | Industrial pipeline pressure reducing valve for petrochemical industry |
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