CN103122882B - Adjustable pilot overflow valve - Google Patents
Adjustable pilot overflow valve Download PDFInfo
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- CN103122882B CN103122882B CN201110367758.5A CN201110367758A CN103122882B CN 103122882 B CN103122882 B CN 103122882B CN 201110367758 A CN201110367758 A CN 201110367758A CN 103122882 B CN103122882 B CN 103122882B
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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 pilot valve in existing relief valve, the invention provides a kind of relief valve, it adopts differential type pilot valve, it is the first cavity volume be communicated with by throttle orifice with filler opening between pilot valve with main valve plug, 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 main valve plug through damping spring, pressure adjusting spring and controlling 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, the conveniently adjusted cracking pressure of controlling mechanism.The present invention reduces impact force when pilot valve cuts out by the guide valve core of differential type pilot valve, upside-down mounting, damping spring, the guide valve seat moved axially and guide valve core, and make guide valve core be in steady state all the time, realize this relief valve and impact 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 in existing 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 cracking pressure 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 comprises a valve body, valve body arranges filler opening and oil spilling mouth, a valve pocket is established in valve body, main valve plug is slidably equipped with in valve pocket, the way moving of described main valve plug in valve pocket can close or conducting filler opening to the oil circuit of oil spilling mouth, slide in valve pocket simultaneously and establish a pilot valve, space between pilot valve and main valve plug is the first cavity volume, pilot valve opposite side has the second cavity volume, first cavity volume is communicated with by main valve throttle orifice with filler opening, in first cavity volume, the axial area of liquid effects on pilot valve is greater than the axial area of liquid effects on pilot valve in the second cavity volume, oil circuit between the chamber being provided with connection first cavity volume and the second cavity volume in pilot valve, pilot valve comprises guide valve core and guide valve seat, guide valve seat and valve pocket inwall sliding fit, guide valve seat is provided with the pilot valve hole of an axial through guide valve seat, guide valve core comprises the guide portion of head, the tapering of afterbody, connect the joint in guide portion and tapering, guide portion and described pilot valve hole sliding fit, between joint and pilot valve hole hole wall, there is pilot valve gap, tapering is positioned at the first cavity volume, when tapering disengages with guide valve seat point limit, the first cavity volume is communicated with pilot valve gap, guide valve seat is provided with the radial direction through hole being communicated with pilot valve gap, valve body is provided with the pilot valve oil outlet being communicated with radial direction through hole, be provided with damping spring in first cavity volume, one end of damping spring contacts with guide valve core and connects, and the other end contacts with main valve plug and connects, pressure adjusting spring and controlling device is established 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 valve body contact, and described 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.
Adjustable pilot overflow valve working principle of the present invention is as follows: when the cracking pressure of filler opening place pressure lower than relief valve, main valve plug contacts with the sealing point limit of valve body under the effect of damping spring, close the oil circuit from filler opening to oil spilling mouth, relief valve is in closed condition, when cracking pressure higher than relief valve of the pressure at filler opening place, first cavity volume has identical pressure owing to being communicated with by throttle orifice with filler opening, 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, when the pressure in the first cavity volume reaches the set pressure of pilot valve, 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, the filler opening side of main valve plug and the pressure difference of the first cavity volume side make primary spools compress damping spring pilot valve direction to move, the sealing point limit of main valve plug and valve body disengages and makes filler opening to the oil circuit conducting of oil spilling mouth, hydraulic oil flows to the existing overflow of oil spilling cause for gossip from filler opening.When the pressure in the first cavity volume is reduced to the set pressure of pilot valve 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 sealing 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, main valve plug again contacts with the sealing point limit of valve body under the effect of damping spring, close from filler opening to the oil circuit of 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 relief valve 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, to realize the advantage that this mechanical shocks is little, the life-span is long, noise is low.
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, the connecting end that the other end is connected with valve body by screw mechanism.Regulated the position of the spacing adjustable side of adjustable lever by screw mechanism and realize regulating the stroke that contacts with adjustable lever of guide valve core and final 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 radial 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 comprises a valve body, valve body arranges filler opening and oil spilling mouth, a valve pocket is established in valve body, main valve plug is slidably equipped with in valve pocket, the way moving of described main valve plug in valve pocket can close or conducting filler opening to the oil circuit of oil spilling mouth, slide in valve pocket simultaneously and establish a pilot valve, space between pilot valve and main valve plug is the first cavity volume, pilot valve opposite side has the second cavity volume, first cavity volume is communicated with by main valve throttle orifice with filler opening, in first cavity volume, the axial area of liquid effects on pilot valve is greater than the axial area of liquid effects on pilot valve in the second cavity volume, oil circuit between the chamber being provided with connection first cavity volume and the second cavity volume in pilot valve, pilot valve comprises guide valve core and guide valve seat, guide valve seat and valve pocket inwall sliding fit, guide valve seat is provided with the pilot valve hole of an axial through guide valve seat, guide valve core comprises the guide portion of head, the tapering of afterbody, connect the joint in guide portion and tapering, guide portion and described pilot valve hole sliding fit, between joint and pilot valve hole hole wall, there is pilot valve gap, tapering is positioned at the first cavity volume, when tapering disengages with guide valve seat point limit, the first cavity volume is communicated with pilot valve gap, guide valve seat is provided with the radial direction through hole being communicated with pilot valve gap, valve body is provided with the pilot valve oil outlet being communicated with radial direction through hole, be provided with damping spring in first cavity volume, one end of damping spring contacts with guide valve core and connects, and the other end contacts with main valve plug and connects, 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 contacts and can be regulated the 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.
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 pilot valve hole, 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 adjustable diameter and screw adjusting mechanism regulate the pretightening force of pressure adjusting spring, conveniently realize the correction adjustment to cracking pressure in the adjustment of this relief valve overflow 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 pilot valve and controlling mechanism in embodiment 1;
Fig. 3 is the structural representation of adjustable pilot overflow valve in the embodiment of the present invention 2;
Fig. 4 is the structural representation of adjustable pilot overflow valve in the embodiment of the present invention 3;
Fig. 5 is the structural representation of adjustable pilot overflow valve in the embodiment of the present invention 4;
Fig. 6 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, valve pocket 12, pilot valve oil outlet 14, valve seat 15, spacing shoulder 16, oil spilling mouth 17, filler opening 18, oil groove 19;
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;
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, valve block 6, working oil path 61, tank oiling channel oil 62;
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 Fig. 1 Fig. 2, valve body is formed by valve seat 15 and the valve pocket 12 be screwed onto on the right side of valve seat 15 and is formed a valve pocket wherein, valve seat 15 is provided with filler opening 18 and oil spilling mouth 17, slide in valve pocket and establish main valve plug 3, under normality, main valve plug 3 seals with the sharp limit on seat the oil circuit contacting and close from filler opening 18 to oil spilling mouth 17, when main valve plug 3 moves right from the oil circuit conducting of filler opening 18 to oil spilling mouth 17.The right side of main valve plug 3 is provided with pilot valve, the madial wall sliding fit of pilot valve and valve pocket 12, space between pilot valve and main valve plug 3 is the first cavity volume 21, is the second cavity volume 22 on the right side of pilot valve, and main valve plug 3 is provided with the main valve throttle orifice being communicated with filler opening 18 and the first cavity volume 21.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.Left section of diameter of guide valve seat 5 is greater than right section of diameter, 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, and tapering 42 can contact to be formed to seal with the sharp limit in pilot valve hole and contact.In the first cavity volume, establish damping spring 23, one end of damping spring 23 contacts with main valve plug 3 and connects, and the other end contacts with the tapering 42 of guide valve core 4 and connects.Guide valve seat 5 is provided with the radial direction through hole 51 being communicated with pilot valve gap 45; Valve pocket 12 is provided with the pilot valve oil outlet 14 being communicated with radial direction through hole 51.Pressure adjusting spring 24 is provided with in the second cavity volume 22, one end of pressure adjusting spring 24 contacts with guide valve seat 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, the other end contacts with nut 9 through the adjustable lever mounting hole on valve pocket 12 and connects, nut 9 is positioned at the outside of adjustable lever mounting hole and valve pocket 12 is spirally connected, and the place of being spirally connected is provided with fastening screw nut 91 prevents the improper movement of nut 9.The end face of the spacing adjustable side of adjustable lever is provided with counterbore 81, and side is provided with the radial perforation 82 running through counterbore 81 sidewall, and when the spacing adjustable side of adjustable lever is contacted with guide valve core 4, the second cavity volume 22 is communicated with oil circuit between chamber 44 by perforation 82, counterbore 81.
In the present embodiment, when inlet pressure is lower than relief valve cracking pressure, pilot valve is in closed condition, and under the impetus of damping spring 23, main valve plug seals with the sharp limit of valve seat and contacts, close from filler opening to the oil circuit of oil spilling mouth, relief valve is in closed condition, when filler opening place pressure raises, hydraulic fluid pressure in first cavity volume 21 also raises, the active force acted on the left of pilot valve increases to when being 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 because of the position-limiting action of adjustable lever, guide valve seat 5 continues to move right, now the tapering 42 of guide valve core 4 disengages with guide valve seat point limit, first cavity volume 21 is communicated with pilot valve gap 45, hydraulic oil in first cavity volume 21 is by pilot valve gap 45, radial direction through hole 51, pilot valve oil outlet 14 flows to outside valve pocket 12, the hydraulic oil flow velocity wherein flowing out the first cavity volume is greater than the flow velocity of the hydraulic oil being entered the first cavity volume by main valve throttle orifice 31, the pressure in the first cavity volume 21 is caused to reduce rapidly, cause the pressure imbalance of main valve plug 3 left and right sides, main valve plug moves right under the promotion of filler opening place hydraulic oil, relief valve is opened, make filler opening to the oil circuit conducting of the oil port that overflows, hydraulic oil flows to oil spilling mouth from filler opening, realize the overflow of hydraulic system.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 in pilot valve hole is contacted with tapering 42 connect, disconnect the oil circuit in the first cavity volume 21 to pilot valve gap 45, the pressure in the first cavity volume 21 is made to be promoted and the active force of the pilot valve left and right sides is balanced, main valve plug resets under the effect of damping spring, close from filler opening to the oil circuit of oil spilling mouth, relief valve cuts out.When the guide valve seat point limit of guide valve seat 5 contacts with tapering 42, guide valve core 4 is moved to the left the impact of snubber guide valve seat 5 under the effect of damping spring 23, reduce the impact force 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 rotary nut 9, 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 rotary nut 9 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 rotary nut 9 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.
Embodiment 2:
As shown in Figure 3, relief valve in the present embodiment is a kind of plug-in overflow valve, its difference is that the valve seat 15 in valve body socket-connects with valve pocket 12 compared with embodiment 1, after this relief valve is installed on valve block 6, filler opening 18 on valve seat 15 is communicated with the working oil path 61 on valve block, oil spilling mouth 17 is communicated with fuel tank loop 62, the enlarged diameter section of guide valve seat 5 and the intracavity sidewall sliding fit of valve seat 15, the intracavity sidewall sliding fit of reduced diameter section and valve pocket 12, valve seat 15 and valve pocket 12 socket-connect on the surface that coordinates and are provided with oil groove 19, the tank oiling channel oil 62 of one end connecting valve block of oil groove 19, the other end is communicated with the radial direction through hole 51 on guide valve seat 5, when pilot valve is opened, hydraulic oil in first cavity volume 21 is by pilot valve gap 45, radial direction through hole 51, oil groove 19 flows in the fuel tank loop 62 of valve block 6.In addition 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 44 between chamber and is communicated with the second cavity volume 22 by end face oil groove 83 with adjustable lever 8.Screw thread is provided with in other one end of adjustable lever 8, formed with valve pocket 12 and be threaded, the end face of threaded end is provided with interior hexagonal counterbore 84, for use apparatus rotation adjusting lever 8, and establishes fastening screw nut 91 to prevent the improper rotation of adjustable lever at the threaded end of adjustable lever 8.
Embodiment 3:
As shown in Figure 4, compared with embodiment 2, the difference of the plug-in overflow valve in the present embodiment is the formation of the second cavity volume 22, in the present embodiment, left section of guide valve seat 5 with the intracavity sidewall sliding fit of valve seat 15, the right side of guide valve seat is provided with cavity, the madial wall 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, and 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 5, compared with embodiment 3, the difference of the plug-in overflow valve in the present embodiment is in the formation of adjustable lever, 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 be spirally connected with 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 6, relief valve in the present embodiment is compared with embodiment 1, its difference is: the spacing shoulder 16 being provided with annular on the chamber wall 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 limit the stroke end position to the right of 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 continues to move right and opens with spacing shoulder 16.
Claims (10)
1. an adjustable pilot overflow valve, comprise a valve body, valve body arranges filler opening (18) and oil spilling mouth (17), a valve pocket is established in valve body, main valve plug (3) is slidably equipped with in valve pocket, the way moving of described main valve plug (3) in valve pocket can close or conducting filler opening (18) to the oil circuit of oil spilling mouth (17), it is characterized in that, slide in valve pocket and establish a pilot valve, space between pilot valve and main valve plug (3) is the first cavity volume (21), the opposite side of pilot valve has the second cavity volume (22), first cavity volume (21) is communicated with by main valve throttle orifice (31) with filler opening (18), the axial area of first cavity volume (21) interior liquid effects on pilot valve is greater than the axial area of liquid effects on pilot valve in the second cavity volume (22), oil circuit (44) between the chamber being provided with connection first cavity volume (21) and the second cavity volume (22) in pilot valve, described pilot valve comprises guide valve core (4) and guide valve seat (5), described guide valve seat (5) and valve pocket sidewall sliding fit, guide valve seat (5) is provided with the pilot valve hole of an axial through guide valve seat, described guide valve core (4) comprises the guide portion (41) of head, the tapering (42) of afterbody, connect the joint (43) of guide portion (41) and tapering (42), described guide portion (41) and described pilot valve hole sliding fit, there is between described joint (43) and pilot valve hole hole wall pilot valve gap (45), described tapering (42) is positioned at the first cavity volume (21), when tapering (42) disengages with guide valve seat point limit, the first cavity volume (21) is communicated with pilot valve gap (45), guide valve seat (5) is provided with the radial direction through hole (51) being communicated with pilot valve gap (45), valve body is provided with the pilot valve oil outlet (14) being communicated with radial direction through hole (51), damping spring (23) is provided with in described first cavity volume (21), one end of described damping spring (23) contacts with described guide valve core (4) and connects, the other end contacts with main valve plug (3) and connects, 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, comprise a valve body, valve body arranges filler opening (18) and oil spilling mouth (17), a valve pocket is established in valve body, main valve plug (3) is slidably equipped with in valve pocket, the way moving of described main valve plug (3) in valve pocket can close or conducting filler opening (18) to the oil circuit of oil spilling mouth (17), it is characterized in that, slide in valve pocket and establish a pilot valve, space between pilot valve and main valve plug (3) is the first cavity volume (21), the opposite side of pilot valve has the second cavity volume (22), first cavity volume (21) is communicated with by main valve throttle orifice (31) with filler opening (18), the axial area of first cavity volume (21) interior liquid effects on pilot valve is greater than the axial area of liquid effects on pilot valve in the second cavity volume (22), oil circuit (44) between the chamber being provided with connection first cavity volume (21) and the second cavity volume (22) in pilot valve, described pilot valve comprises guide valve core (4) and guide valve seat (5), described guide valve seat (5) and valve pocket sidewall sliding fit, guide valve seat (5) is provided with the pilot valve hole of an axial through guide valve seat, described guide valve core (4) comprises the guide portion (41) of head, the tapering (42) of afterbody, connect the joint (43) of guide portion (41) and tapering (42), described guide portion (41) and described pilot valve hole sliding fit, there is between described joint (43) and pilot valve hole hole wall pilot valve gap (45), described tapering (42) is positioned at the first cavity volume (21), when tapering (42) disengages with guide valve seat point limit, the first cavity volume (21) is communicated with pilot valve gap (45), guide valve seat (5) is provided with the radial direction through hole (51) being communicated with pilot valve gap (45), valve body is provided with the pilot valve oil outlet (14) being communicated with radial direction through hole (51), damping spring (23) is provided with in described first cavity volume (21), one end of described damping spring (23) contacts with described guide valve core (4) and connects, the other end contacts with main valve plug and connects, 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), be provided with in the tapering (42) of guide valve core and limit the spacing preiection (47) of guide valve core to the second cavity volume direction shift motion with spacing shoulder (16) Corresponding matching.
10. adjustable pilot 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110367758.5A CN103122882B (en) | 2011-11-18 | 2011-11-18 | Adjustable pilot overflow valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110367758.5A CN103122882B (en) | 2011-11-18 | 2011-11-18 | Adjustable pilot overflow valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103122882A CN103122882A (en) | 2013-05-29 |
| CN103122882B true CN103122882B (en) | 2016-03-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110367758.5A Active CN103122882B (en) | 2011-11-18 | 2011-11-18 | Adjustable pilot overflow valve |
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| CN (1) | CN103122882B (en) |
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| CN103758807A (en) * | 2014-01-10 | 2014-04-30 | 张思学 | Automobile differential constant-current steering booster pump or threaded differential relief cartridge valve |
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| CN105134681B (en) * | 2015-10-08 | 2017-06-06 | 杭州力龙液压有限公司 | A kind of one-way buffer overflow valve and closed type hydraulic pump |
| CN106523578A (en) * | 2016-12-16 | 2017-03-22 | 贵州红林机械有限公司 | Pilot type flow proportional solenoid valve for CDC shock absorber system |
| CN107676506B (en) * | 2017-10-30 | 2024-04-23 | 圣邦集团有限公司 | Three-way flow valve with adjustable throttling port |
| CN108278393B (en) * | 2018-01-22 | 2019-06-14 | 宁波海宏液压有限公司 | A kind of slide valve type guide one-way overflow valve |
| CN109268566B (en) * | 2018-10-24 | 2024-02-09 | 黄小伟 | Electromagnetic valve |
| CN111577695A (en) * | 2020-06-15 | 2020-08-25 | 裕泰液压科技(上海)有限公司 | Integral plug-in type valve core assembly for guide overflow valve |
| CN112096682B (en) * | 2020-09-30 | 2021-11-19 | 潍柴动力股份有限公司 | Pilot-operated type electric proportional high-pressure overflow valve |
| CN113719491B (en) * | 2021-09-03 | 2023-12-15 | 宁波海宏液压有限公司 | Use stable combination load control valve |
| CN117307737B (en) * | 2023-11-30 | 2024-02-13 | 佛山市长茂液压机械制造有限公司 | Active adjustable cartridge valve |
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| CN103122882A (en) | 2013-05-29 |
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