CN103089728B - Differential type pilot overflow valve - Google Patents
Differential type pilot overflow valve Download PDFInfo
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- CN103089728B CN103089728B CN201110340981.0A CN201110340981A CN103089728B CN 103089728 B CN103089728 B CN 103089728B CN 201110340981 A CN201110340981 A CN 201110340981A CN 103089728 B CN103089728 B CN 103089728B
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Abstract
The present invention discloses a kind of differential type pilot overflow valve, impact between guide valve core and guide valve seat greatly for solving in existing precursor overflow valve, the fragile life-span is short and vibrate, the shortcoming that noise is large, precursor overflow valve of the present invention arranges differential type pilot valve in pilot valve chamber, it is the first cavity volume be communicated with filler opening inside pilot valve, outside is the second cavity volume being communicated with the first cavity volume by throttle orifice, guide valve core is slidedly arranged in guide valve seat, its sealing cone is positioned at the first cavity volume and is connected with a damping spring, second cavity volume side establishes pressure adjusting spring to be connected with guide valve seat, pilot valve gap between guide valve seat and guide valve core, radial direction through hole and oil outlet form the leakage oil duct that pilot valve is opened.The present invention reduces impact force when pilot valve cuts out by the damping function in the guide valve core of the pilot valve of differential type, upside-down mounting, damping spring, axially movable guide valve seat and guide valve core and pilot valve gap, 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 that noise is low.
Description
Technical field
The present invention relates to the differential type pilot overflow valve in the hydraulic element of hydraulic system, particularly hydraulic system.
Technical background
Comprise main valve and main valve opening device at existing split type relief valve, carry out the hydraulic pressure in the epicoele of control bound with main valve opening device, open main valve plug by the hydraulic pressure reduced in epicoele.Existing main valve opening device is generally a kind of Pilotoperated reducing valve, as shown in Figure 1, guide valve seat 5 maintains static, guide valve core 4 to be positioned in the valve opening of guide valve seat 5 by the column register pin at its top and with valve opening for interval coordinates, guide valve seat 5 there is the pilot valve filler opening 12 be communicated with main valve epicoele, there is the second filler opening 30 be communicated with main valve filler opening by main valve throttle orifice, have the pilot valve oil outlet 11 be communicated with main valve oil spilling mouth by pilot valve epicoele.This structure utilizes pressure adjusting spring 7 to balance the active force of hydraulic oil suffered by guide valve core, therefore requires that the rigidity of pressure adjusting spring 7 is very high.Control valve frequently opens and closes along with the pressure surge in hydraulic system, and guide valve core 4 and guide valve seat 5 also just open and close continually.Due to fixed during guide valve seat in existing main valve opening device, this just causes pilot valve to produce very large impact when opening and closing between guide valve core 4 and the sharp limit 8 of guide valve seat 5, make pilot valve cause damage in certain operating time internal cause impact force, reduce control 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 4 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.
Summary of the invention
The object of the invention is to for the main valve opening device of existing relief valve be hit large and fragile, the life-span is short, and easily produces vibration and the shortcoming of uttering long and high-pitched sounds, and provides a kind of good stability, noise is little, the differential type pilot overflow valve of long service life.
Technological scheme of the present invention is achieved in that a kind of differential type pilot overflow valve of structure, the main valve opening device comprising main valve and be fixedly connected with main valve, and main valve comprises main valve body, and main valve body is provided with main valve plug chamber, oil spilling mouth, arranging in main valve plug chamber can the main valve plug of movement vertically wherein, one end of main valve plug is provided with Returnning spring, main valve filler opening can be communicated with oil spilling mouth when it moves axially or close by the other end, main valve plug is provided with the epicoele adjacent with main valve plug in the same side of Returnning spring, wherein main valve opening device comprises a valve body, the bonnet be spirally connected with valve body, pilot valve chamber is formed in valve body and bonnet, slide in pilot valve chamber and a pilot valve is set, the inner side of pilot valve is the first cavity volume, first cavity volume is communicated with epicoele, the second cavity volume is provided with outside pilot valve, pilot valve is provided with the pilot valve throttle orifice of connection first cavity volume and the second cavity volume, pilot valve comprises guide valve core and guide valve seat, guide valve seat and pilot valve cavity wall sliding fit, guide valve seat is provided with the pilot valve hole of an axial through guide valve seat, guide valve core comprises the guide portion of head, the sealing cone of afterbody, connect the joint of guide portion and sealing cone, sealing cone is positioned at the first cavity volume, guide portion and pilot valve hole sliding fit, there is between joint and pilot valve hole pilot valve gap, when sealing cone disengages with the sharp limit of guide valve seat, the first cavity volume is communicated with pilot valve gap, guide valve seat is provided with the radial direction through hole being communicated with pilot valve gap, valve body is provided with the oil outlet being communicated with radial direction through hole, oil outlet is communicated with oil spilling mouth, damping spring is provided with in first cavity volume, one end of damping spring is connected with guide valve core, the other end is connected with valve body, establish in the second cavity volume and make guide valve core be less than the limit stoper of guide valve seat to the sliding stroke in the second cavity volume direction to the shift motion in the second cavity volume direction, pressure adjusting spring is provided with in the outside of pilot valve, one end of pressure adjusting spring contacts with guide valve seat and connects, and the other end is connected with bonnet, 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, and the first cavity volume is communicated with main valve filler opening by main valve throttle orifice.
Differential type pilot overflow valve working principle of the present invention is as follows: before main valve opening device is opened, and the first cavity volume is communicated with main valve filler opening by main valve throttle orifice, makes the first cavity volume have identical hydraulic pressure with main valve filler opening place.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 main valve opening device, hydraulic oil in first cavity volume and the active force of damping spring to pilot valve to be greater than in the second cavity volume hydraulic oil and pressure adjusting spring to the active force of pilot valve, pilot valve is moved (hydraulic oil of the second cavity volume also flows to the first cavity volume by pilot valve throttle orifice) to the second cavity volume direction, when guide valve core contacts with limit stoper, guide valve core stops mobile, guide valve seat continues to move to the direction of the second cavity volume, now the sealing cone of guide valve core and the sharp 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, oil outlet flows out the first cavity volume, enter the oil spilling mouth of main valve, pressure in first cavity volume is reduced rapidly, thus the pressure reduced in the main valve epicoele that is connected with the first cavity volume, make primary spools under the effect of main valve filler opening place hydraulic oil dorsad the direction of main valve filler opening move, main valve filler opening is directly communicated with oil spilling mouth, also namely relief valve is opened.Along with the pressure in the first cavity volume reduces rapidly, the hydraulic oil of the second cavity volume also flows to the first cavity volume by pilot valve throttle orifice, pressure in second cavity volume also decreases, but due to the damping function of pilot valve throttle orifice, the Pressure Drop low speed of the second cavity volume is lower than the Pressure Drop low speed in the first cavity volume, when the pressure in the first cavity volume is reduced to the set pressure of main valve opening device closedown, hydraulic oil in first cavity volume and the axial force of damping spring to pilot valve to be less than in the second cavity volume hydraulic oil and pressure adjusting spring to the axial force of pilot valve, guide valve seat moves to the first cavity volume direction under the effect of pressure adjusting spring, the sharp limit of guide valve seat and the sealing of guide valve core is made to bore taper-face contact, disconnect the oil circuit from the first cavity volume and pilot valve gap, make the boost in pressure of the first cavity volume, thus the upper cavity pressure that the control valve main valve plug that also raising is connected with the first cavity volume resets, primary spools is moved to main valve filler opening direction under the effect of Returnning spring, close the oil circuit of main valve filler opening to oil spilling mouth.In the process that pilot valve cuts out, guide valve seat moves to the first cavity volume direction under the effect of pressure adjusting spring, the volume of the second cavity volume increases, hydraulic oil enters into the second cavity volume through pilot valve throttle orifice, but due to the damping function of pilot valve throttle orifice, the travelling speed of guide valve seat can be slowed down, reduce impact when guide valve seat contacts with guide valve core.The present invention is arranged in the first cavity volume of 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, the damping function of damping spring, axially movable guide valve seat and guide valve core and pilot valve throttle orifice reduces impact force when pilot valve cuts out, and make guide valve core be in a steady state all the time, impact the advantage little, the life-span is long, noise is low to realize main valve opening device, also improved the performance and operational life-span of relief valve by this measure.
In the present invention, main valve throttle orifice can be arranged on main valve body, can also be arranged on main valve plug, when main valve throttle orifice is arranged on main valve plug, main valve filler opening is communicated with by main valve throttle orifice with epicoele, but because epicoele is connected with the first cavity volume, therefore, the first cavity volume is also just communicated with by main valve throttle orifice with main valve filler opening place indirectly.
In the present invention, limit stoper is limited post, and its one end is fixedly connected with bonnet, and the other end is for contacting the positive stop end connected with guide valve core.The endoporus be socketed with limited post can be provided with in addition in the inner side of bonnet, limited post sleeve is socketed by closely cooperating or is spirally connected to prevent from use preventing limited post generation deflection by screw thread in endoporus, and limited post also can be and bonnet integrative-structure in addition.Pressure regulation pad can be provided with between pressure adjusting spring and bonnet.Pressure regulation pad, for finely tuning the elastic force of pressure adjusting spring to guide valve seat, accurately sets up the pressure that pilot valve is opened.In addition also by being provided with locking cap in bonnet, limited post fixed hole is established at the center of locking cap, fixedly sleeved with limited post, and the outer side surface of locking cap and the inner side surface of bonnet are connected.One end of pressure adjusting spring contacts with locking cap, and locking cap is withstood on the bottom inside bonnet by pressure adjusting spring.Locking cap and locating column can be threaded, being tightly fixed is connected, welds or is structure as a whole.Also pressure regulation pad can be provided with between pressure adjusting spring and locking cap.
In the present invention, pilot valve throttle orifice can be arranged on guide valve seat, also can be arranged on guide valve core, the end face of the positive stop end of limited post be established the logical oily passage that end face flows into, side is flowed out, logical oily passage is communicated with pilot valve throttle orifice when guide valve core is connected with spacing end contact.When this measure is the end contact in order to make when guide valve core and positive stop end, pilot valve throttle orifice is communicated with the second cavity volume by logical oily passage, can not block it be communicated with because of the end face of positive stop end and the contact of guide valve core.Logical oil duct can take various ways, such as, on the end face of positive stop end, be provided with counterbore, positive stop end side be provided with the penetration hole running through counterbore sidewall, counterbore is communicated with pilot valve throttle orifice when guide valve core is connected with the end contact of positive stop end; Or arrange the oil groove running through the end face of whole positive stop end on the end face of positive stop end, when guide valve core is connected with the end contact of positive stop end, oil groove is communicated with pilot valve throttle orifice.
In the present invention, the outer side surface that guide valve seat coordinates with pilot valve cavity wall is provided with the first seal groove, and the first seal groove is embedded with the first seal ring.
In the present invention, guide valve seat has seal sleeve near the arranged outside of the part of the second cavity volume, the madial wall of seal sleeve and guide valve seat sliding fit, and the two ends of seal sleeve contact with bonnet with valve body respectively and connect.By arranging seal sleeve, easily can meet the coaxality requirement of seal sleeve and guide valve seat, guide valve seat can be moved axially wherein swimmingly, reduce manufacture requirements.
In the present invention, guide valve seat can be connected with limited post sliding fit, and the end face outside in pilot valve chamber is provided with a cavity, and the sidewall of cavity and the side sliding fit of limited post, guide valve seat and limited post form the second cavity volume.The side that limited post matches with guide valve seat is provided with the second seal groove, and the second seal groove is embedded with the second seal ring.Seal ring is set for promoting the sealing coordinated between them.
The present invention compared with prior art, has following beneficial effect:
1, in differential type 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; Moreover when guide valve seat guide spool moves closedown, pilot valve throttle orifice can play damping function, reduce the impact between guide valve seat and guide valve core further.The present invention reduces impact force when guide valve seat is closed with guide valve core by the guide valve seat, guide valve core, the buffering of damping spring, the damping function of pilot valve throttle orifice etc. that can move axially, thus the working life also namely extending relief valve working life of prolongation pilot valve.
2, in the present invention, guide valve core is by its guide portion and valve opening sliding fit, make it only can slide axially along guide's valve opening, can not produce radial skew, in addition when pilot valve is opened, one end of guide valve core is subject to the extruding of damping spring, the other end contacts with limit stoper, 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.
Accompanying drawing explanation
Fig. 1 is the structural representation of existing precursor overflow valve main valve opening device;
Fig. 2 is the structural representation sketch of differential type pilot overflow valve in the embodiment of the present invention 1;
Fig. 3 is the structural representation of main valve in the embodiment of the present invention 1;
Fig. 4 is the structural representation of main valve opening device in the embodiment of the present invention 1;
Fig. 5 is the pilot valve of main valve opening device and the structural representation of limit stoper in the embodiment of the present invention 1;
Fig. 6 is view when differential type pilot overflow valve is opened in the embodiment of the present invention 1;
Fig. 7 is the schematic diagram of differential type pilot overflow valve in the embodiment of the present invention 2;
Fig. 8 is the schematic diagram of differential type pilot overflow valve in the embodiment of the present invention 3;
Fig. 9 is the schematic diagram of differential type pilot overflow valve in the embodiment of the present invention 4;
Figure 10 is the schematic diagram of differential type pilot overflow valve in the embodiment of the present invention 5.
Component title and sequence number in figure:
Valve body 1, damping spring 2, first cavity volume 3, guide valve core 4, guide valve seat 5, second cavity volume 6, pressure adjusting spring 7, limited post 8, bonnet 9, pressure regulation pad 10, oil outlet 11, pilot valve filler opening 12, pilot valve throttle orifice 13, sealing cone 14, joint 15, pilot valve gap 16, radial direction through hole 17, guide portion 18, penetration hole 19, positive stop lug boss 20, counterbore 21, first seal groove 22, first seal ring 23, locking cap 24, locking cap endoporus 25, second seal groove 26, second seal ring 27, endoporus 28, seal sleeve 29, second filler opening 30, main valve body 31, main valve filler opening 32, oil spilling mouth 33, epicoele 34, Returnning spring 35, main valve plug 36, main valve throttle orifice 37, main valve throttle orifice oil circuit 38, spring chamber 39, leak oil duct 40, main valve opening device A, main valve B.
Embodiment
Below in conjunction with drawings and Examples, differential type pilot overflow valve of the present invention is described.
Embodiment 1:
As shown in Figure 2, this differential type pilot overflow valve main valve B and the main valve opening device A that is fixedly connected with main valve B.As shown in Figure 3, main valve comprises main valve body 31, and main valve body 31 is provided with main valve plug chamber, oil spilling mouth 33; Arranging in main valve plug chamber can the main valve plug 36 of movement vertically wherein, the side of main valve plug 36 is main valve filler opening 32, opposite side is epicoele 34, Returnning spring 35 is set in epicoele 34, the valve body 1 of main valve opening device is withstood in one end of Returnning spring, the other end withstands main valve plug 36, pushes main valve plug 36 to main valve filler opening 32, and main valve plug 36 can move and main valve filler opening 32 can be communicated with oil spilling mouth 33 in main valve filler opening direction dorsad.
As shown in Figure 4, Figure 5, the bonnet 9 that main valve opening device comprises valve body 1, is spirally connected with valve body 1, pilot valve chamber is formed in valve body 1 and bonnet 9, slide in pilot valve chamber and a pilot valve is set, pilot valve is the first cavity volume 3 away from the inner side of bonnet 9, valve body 1 is provided with the filler opening 12 be communicated with the first cavity volume 3, and pilot valve is provided with the second cavity volume 6 near the outside of bonnet.Pilot valve comprises guide valve core 4 and guide valve seat 5, the pilot valve throttle orifice 13 of connection first cavity volume 3 and the second cavity volume 6 is provided with in guide valve core 4, guide valve seat 5 and pilot valve cavity wall sliding fit, guide valve seat 5 is provided with the pilot valve hole of an axial through guide valve seat, guide valve core 4 comprises the guide portion 18 of head, the sealing cone 14 of afterbody, connect the joint 15 of guide portion and sealing cone, sealing cone 14 is positioned at the first cavity volume 3, guide portion 18 and pilot valve hole sliding fit, there is between joint 15 and pilot valve hole pilot valve gap 16, when guide valve seat 5 moves to the second cavity volume 5 direction relative to guide valve core 4, pilot valve gap 16 can be communicated with the first cavity volume 3, guide valve seat 5 is provided with the radial direction through hole 17 being communicated with pilot valve gap.Valve body 1 is provided with the oil outlet 11 being communicated with radial direction through hole 17; Damping spring 2 is provided with in first cavity volume 3, one end of damping spring 2 is connected with guide valve core 4, the other end is connected with valve body 1, establish in the second cavity volume 6 and make guide valve core 4 be less than the limited post 8 of guide valve seat 5 to the second cavity volume 6 sliding stroke to the shift motion of the second cavity volume 6, pressure adjusting spring 7 is provided with in the outside of pilot valve, one end of pressure adjusting spring 7 contacts with guide valve seat 5 and connects, and the other end is connected with bonnet 9.One end of limited post 8 is by screw thread or closely cooperate sleeve in the endoporus 28 of bonnet 9, be fixedly connected with bonnet 9, the other end of limited post 8 is provided with positive stop lug boss 20, the end face of positive stop lug boss 20 is provided with counterbore 21, the side of positive stop lug boss 20 is provided with the penetration hole 19 running through and be communicated with counterbore 21 sidewall, and counterbore 21 is communicated with pilot valve throttle orifice 13 when guide valve core 4 contacts connect with positive stop lug boss 20.The diameter that guide valve seat 5 is positioned at one section, the first cavity volume 3 side is greater than the diameter that guide valve seat 5 is positioned at one section, the second cavity volume 6 side, the inwall sliding fit of enlarged diameter section and valve body 1, the inwall sliding fit of reduced diameter section and bonnet 9, the outer side surface that large and small diameter section coordinates with valve body 1, bonnet 9 inwall is respectively provided with the first seal groove 22, and seal groove is embedded with the first seal ring 23.Main valve body 31 arranges main valve throttle orifice 37, and by main valve throttle orifice oil circuit 38, second filler opening 30, first cavity volume 3 is communicated with main valve filler opening 32.
Differential type pilot overflow valve working principle of the present invention is as follows: as shown in Figure 6, before main valve B opens, first cavity volume 3 is owing to being communicated with main valve filler opening 32, hydraulic pressure in it is equal with the pressure at main valve filler opening 32 place, and main valve plug 36 pushes up to main valve filler opening 32 and closes the oil circuit of main valve filler opening 32 to oil spilling mouth 33 under the effect of Returnning spring 35.When the hydraulic pressure at main valve filler opening 32 place raises, the pressure in the first cavity volume 3, second cavity volume 6 also increases.The axially effectively lifting surface area acted on pilot valve due to hydraulic oil in the first cavity volume 3 is greater than hydraulic oil in the second cavity volume 6 and acts on axially effective lifting surface area on pilot valve, pilot valve is positioned at the first cavity volume 3, increasing along with the rising of hydraulic pressure with joint efforts of hydraulic action suffered by second cavity volume 6 both sides, when the pressure in the first cavity volume 3 reaches the set pressure of pressure adjusting spring 7, the active force of the hydraulic oil in the first cavity volume 3 and damping spring 2 pairs of pilot valves is greater than the active force of hydraulic oil and pressure adjusting spring 7 pairs of pilot valves in the second cavity volume 6, pilot valve is moved (hydraulic oil of the second cavity volume 6 also flows to the first cavity volume by pilot valve throttle orifice 13) to the direction of the second cavity volume 6, when guide valve core 4 contacts with limited post 8, guide valve core 4 stops mobile, guide valve seat 5 continues to move to the direction of the second cavity volume 6, now the sealing cone 14 of guide valve core 4 disengages with the sharp limit of guide valve seat 5, first cavity volume 3 is communicated with pilot valve gap 16, hydraulic oil in first cavity volume 3 is by pilot valve gap 16, radial direction through hole 17, oil outlet 11 stream flows to the oil spilling mouth 33 of main valve B, due to the damping function of main valve throttle orifice 37, main valve filler opening fully can not supplement the hydraulic oil run off in the first cavity volume 3, pressure in first cavity volume 3 is reduced rapidly, thus the pressure reduced in the epicoele 34 that is connected with the first cavity volume 3, destroy main valve plug 36 both sides hydraulic flat and, primary spools 36 is moved to the direction of main valve filler opening 32 dorsad in the effect of hydraulic oil, thus be communicated with main valve filler opening 32 and oil spilling mouth 33, even if also main valve is opened and action.Along with the pressure in the first cavity volume 3 reduces rapidly, the hydraulic oil of the second cavity volume 6 also flows to the first cavity volume 3 by pilot valve throttle orifice 13, pressure in second cavity volume 6 also decreases, but due to the damping function of pilot valve throttle orifice 13, the Pressure Drop low speed of the second cavity volume 6 is lower than the Pressure Drop low speed in the first cavity volume 3, when the pressure in the first cavity volume is reduced to the set pressure of pilot valve closedown, the axial force of the hydraulic oil in the first cavity volume 3 and damping spring 2 pairs of pilot valves is less than the axial force of hydraulic oil and pressure adjusting spring 7 pairs of pilot valves in the second cavity volume 6, guide valve seat 5 moves to the first cavity volume 3 direction under the effect of pressure adjusting spring, the sharp limit of guide valve seat 5 and the sealing of guide valve core 4 is made to bore 14 taper-face contact, disconnect the oil circuit from the first cavity volume and pilot valve gap, make the boost in pressure in the first cavity volume 3, thus the pressure also improved in the epicoele 34 that is connected with the first cavity volume 3, primary spools both sides are made to re-establish hydro-cushion, main valve plug moves to main valve filler opening direction under the promotion of Returnning spring, close the oil circuit of main valve filler opening to oil spilling mouth, also namely main valve is closed.
Embodiment 2:
As shown in Figure 7, compared with embodiment 1, the difference of the differential type pilot overflow valve in the present embodiment is that main valve throttle orifice 37 is arranged on main valve plug 36, epicoele 34 is communicated with main valve filler opening 32 by main valve throttle orifice 37, due to what be communicated with the first cavity volume 3 during epicoele 34, therefore namely the first cavity volume 3 also passes through epicoele 34 through main valve throttle orifice 37 and main valve filler opening indirect communication.
Embodiment 3:
As shown in Figure 8, compared with embodiment 2, the difference of the differential type pilot overflow valve in the present embodiment, the reduced diameter section arranged outside of guide valve seat 5 has seal sleeve 29, the madial wall of seal sleeve 29 and the reduced diameter section outer side wall sliding fit of guide valve seat 5, the two ends of seal sleeve 29 contact with bonnet 9 with valve body 1 respectively, carry out axially locating by the extruding of bonnet 9.The present embodiment is by arranging seal sleeve 29, and in manufacturing process, seal sleeve 29 requires easily to be met with the coaxality of guide valve seat 5, can reduce the difficulty of manufacturing.Another difference is that limited post 8 is structure as a whole with bonnet 9, and this also can simplified structure, reduces manufacture difficulty and cost.
Embodiment 4:
As shown in Figure 9, compared with embodiment 2, the difference of the differential type pilot overflow valve in the present embodiment is: guide valve seat 5 has a columniform cavity on the outer side surface of bonnet, the sidewall of cavity and the sidewall sliding fit of limited post 8, guide valve seat 5 and limited post 8 form the second cavity volume 6, the side that limited post 8 matches with guide valve seat 5 is provided with the second seal groove 26, second seal groove and is embedded with the second seal ring 27.Locking cap 24 is provided with in bonnet 9, the center of locking cap is provided with the fixed hole 25 of fixing limited post, limited post 8 sleeve is in fixed hole 25, with locking cap by closely cooperate or screw thread forms a fixed connection, the outer side surface of locking cap 24 and the inner side surface of bonnet 9 are connected, pressure adjusting spring 7 contacts with locking cap 8 and connects, and arranges pressure regulation pad 10 between, and locking cap is pushed to be fixed locking cap bottom bonnet inner bore by pressure adjusting spring 7.Differential type pilot overflow valve in the present embodiment is identical with the opening mechanism open theory in the first embodiment and action.
Embodiment 5:
As shown in Figure 10, compared with embodiment 1, the difference of the differential type pilot overflow valve in the present embodiment is main valve, and as shown in Figure 10, being provided with in the main valve chamber of main valve body 31 can at the main valve plug 36 of axial direction movement, the side of main valve body 31 is provided with filler opening 32, ground is provided with oil spilling mouth 33, and there is sealing cone one end of main valve plug 36, can be formed to seal with main valve body 31 to contact, the other end is provided with Returnning spring 35, and Returnning spring 35 pushes main valve plug 36 to oil spilling mouth 33.The middle part of main valve plug 36 is provided with the shoulder of a projection, the top of shoulder is epicoele 34, epicoele 34 is communicated with the filler opening of main valve opening device A, main valve plug shoulder is provided with main valve throttle orifice 37, be communicated with the main valve filler opening 32 be positioned at below main valve plug shoulder by epicoele 34, the oil outlet 11 of main valve opening device A is communicated with main valve oil spilling mouth 33 through the spring chamber 39 of main valve Returnning spring, the axial leakage oil duct 40 running through main valve plug 36.Before in the present embodiment, the pilot valve of main valve opening device is opened, main valve filler opening 32, epicoele 34, the pressure at the first cavity volume three place is equal, main valve plug 36 pushes oil spilling mouth 33 under the effect of Returnning spring, relief valve is made to be in closed condition, when the setting of the pressure in the first cavity volume higher than main valve opening device, the pilot valve of main valve opening device is opened, epicoele 34, hydraulic oil in first cavity volume is rapidly through oil outlet 11, spring chamber 39, leak oil duct 40 and flow to oil spilling mouth 33, epicoele 34 internal pressure is caused to decline rapidly, main valve plug 36 compression reseting spring 35 dorsad oil spilling mouth 33 moves, main valve oil-feed 32 mouthfuls is communicated with oil spilling mouth 33 and realizes overflow.
Claims (12)
1. a differential type pilot overflow valve, the main valve opening device (A) comprising main valve (B) and be fixedly connected with main valve, described main valve (B) comprises main valve body (31), and main valve body (31) is provided with main valve plug chamber, oil spilling mouth (33), main valve filler opening (32), arranging in main valve plug chamber can the main valve plug (36) of movement vertically wherein, one end of main valve plug (36) is provided with Returnning spring (35), main valve filler opening (32) can be communicated with oil spilling mouth (33) when it moves axially or close by the other end, described main valve plug (36) is provided with the epicoele (34) adjacent with main valve plug (36) in the same side of Returnning spring (35), it is characterized in that main valve opening device comprises a valve body (1), the bonnet (9) be spirally connected with valve body, pilot valve chamber is formed in described valve body and bonnet, slide in pilot valve chamber and a pilot valve is set, the inner side of described pilot valve is the first cavity volume (3), first cavity volume (3) is communicated with described epicoele (34), the second cavity volume (6) is provided with outside pilot valve, pilot valve is provided with the pilot valve throttle orifice (13) of connection first cavity volume (3) and the second cavity volume (6), described pilot valve comprises guide valve core (4) and guide valve seat (5), described guide valve seat (5) and pilot valve cavity wall 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 (18) of head, sealing cone (14) of afterbody, connect the joint (15) of guide portion and sealing cone, described sealing cone (14) is positioned at the first cavity volume (3), described guide portion (18) and described pilot valve hole sliding fit, there is between described joint (15) and pilot valve hole wall pilot valve gap (16), when sealing cone disengages with the sharp limit of guide valve seat, the first cavity volume is communicated with pilot valve gap, guide valve seat (5) is provided with the radial direction through hole (17) being communicated with pilot valve gap, valve body (1) is provided with the oil outlet (11) being communicated with radial direction through hole (17), described oil outlet (11) is communicated with described oil spilling mouth (33), damping spring (2) is provided with in described first cavity volume (3), one end of described damping spring is connected with described guide valve core (4), the other end is connected with described valve body (1), establish in the second cavity volume (6) and make guide valve core (4) be less than the limit stoper of guide valve seat (5) to the sliding stroke in the second cavity volume (6) direction to the shift motion in the second cavity volume (6) direction, pressure adjusting spring (7) is provided with in the outside of pilot valve, one end of described pressure adjusting spring contacts with guide valve seat (5) and connects, and the other end is connected with bonnet (9), the axial area of the interior liquid effects of described first cavity volume (3) on pilot valve is greater than the axial area of liquid effects on pilot valve in the second cavity volume (6), and described first cavity volume (3) is communicated with main valve filler opening (32) by main valve throttle orifice (37).
2. differential type pilot overflow valve according to claim 1, it is characterized in that, described main valve throttle orifice (37) is arranged on main valve body (31), or main valve throttle orifice (37) is arranged on and main valve plug (36) is communicated with epicoele (34) and main valve filler opening (32).
3. differential type pilot overflow valve according to claim 1 and 2, it is characterized in that, described limit stoper is limited post (8), and its one end is fixedly connected with bonnet (9), and the other end is for contacting with guide valve core (4) positive stop end connected.
4. differential type pilot overflow valve according to claim 3, it is characterized in that, described pilot valve throttle orifice (13) is arranged on described guide valve core (4), the end face of the positive stop end of described limited post (8) is provided with the logical oily passage flowed out from end face inflow, side, described logical oily passage is communicated with described pilot valve throttle orifice (13) when guide valve core (4) contacts connect with the end face (20) of positive stop end.
5. differential type pilot overflow valve according to claim 3, it is characterized in that, locking cap (24) is provided with in described bonnet (9), the center of described locking cap is provided with limited post fixed hole (25), limited post sleeve is in fixed hole (25), the outer side surface of described locking cap (24) and the inner side surface of described bonnet (9) are connected, and one end of described pressure adjusting spring contacts with the shade of locking cap and connects.
6. differential type pilot overflow valve according to claim 3, it is characterized in that, described guide valve seat (5) is provided with cavity near one end of limited post, and one end sliding fit of the inwall of described cavity and limited post (8) connects and composes described second cavity volume.
7. differential type pilot overflow valve according to claim 1, it is characterized in that, the outer side surface that described guide valve seat (5) coordinates with pilot valve cavity wall is provided with the first seal groove (22), and described first seal groove is embedded with the first seal ring (23).
8. differential type pilot overflow valve according to claim 6, it is characterized in that, the side that described limited post (8) matches with guide valve seat (5) is provided with the second seal groove (26), and described second seal groove is embedded with the second seal ring (27).
9. differential type pilot overflow valve according to claim 1, is characterized in that, is provided with pressure regulation pad (10) between described pressure adjusting spring (7) and described bonnet (9).
10. differential type pilot overflow valve according to claim 3, it is characterized in that, described guide valve seat has seal sleeve (29) near the arranged outside of the sections of the second cavity volume (6), the madial wall of described seal sleeve (29) and guide valve seat (5) sliding fit, the two ends of seal sleeve (29) contact with bonnet (9) with valve body (1) respectively and connect.
11. differential type pilot overflow valve according to claim 5, it is characterized in that, described guide valve seat (5) is provided with cavity near one end of limited post, and one end sliding fit of the inwall of described cavity and limited post (8) connects and composes described second cavity volume.
12. differential type pilot overflow valve according to claim 5, it is characterized in that, described guide valve seat has seal sleeve (29) near the arranged outside of the sections of the second cavity volume (6), the madial wall of described seal sleeve (29) and guide valve seat (5) sliding fit, the two ends of seal sleeve (29) contact with bonnet (9) with valve body (1) respectively and connect.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110340981.0A CN103089728B (en) | 2011-11-02 | 2011-11-02 | Differential type pilot overflow valve |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110340981.0A CN103089728B (en) | 2011-11-02 | 2011-11-02 | Differential type pilot overflow valve |
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| CN103089728A CN103089728A (en) | 2013-05-08 |
| CN103089728B true CN103089728B (en) | 2016-03-16 |
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| CN201110340981.0A Active CN103089728B (en) | 2011-11-02 | 2011-11-02 | Differential type pilot overflow valve |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105927608B (en) * | 2016-07-12 | 2017-11-21 | 李桃 | Pilot controller |
| CN106015141B (en) * | 2016-07-12 | 2017-11-21 | 李桃 | Leading controller suitable for pilot valve |
| CN106870497B (en) * | 2017-04-10 | 2018-05-01 | 中南大学 | A kind of vibration absorber and design method for hydraulic valve |
| CN107725826B (en) * | 2017-11-01 | 2024-05-31 | 联合汽车电子有限公司 | Valve assembly and electromagnetic valve |
| CN110552827B (en) * | 2018-06-04 | 2022-11-11 | 罗伯特·博世有限公司 | Oil inlet valve for high-pressure oil pump and corresponding high-pressure oil pump |
| CN114484027B (en) * | 2022-04-18 | 2022-06-21 | 东营市特种设备检验研究院 | Pressure reducing valve for industrial pipeline for petrochemical industry |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2230915A1 (en) * | 1973-05-21 | 1974-12-20 | Bennes Marrel | |
| CN2697420Y (en) * | 2004-04-21 | 2005-05-04 | 华中科技大学 | Pre-guiding type water pressure overflow valve |
| CN2804526Y (en) * | 2005-01-21 | 2006-08-09 | 湖南科技大学 | Pilot overflow valve |
| CN201062598Y (en) * | 2007-07-11 | 2008-05-21 | 上海立新液压有限公司 | Pilot discharge valve |
| CN201144914Y (en) * | 2007-12-29 | 2008-11-05 | 上海立新液压有限公司 | Pilot type pressure reducing valve |
| CN201344292Y (en) * | 2008-12-31 | 2009-11-11 | 中船重工重庆液压机电有限公司 | Large-flow slide valve pilot-operated overflow valve |
| DE102008044800A1 (en) * | 2008-08-28 | 2010-03-04 | Robert Bosch Gmbh | Pilot-controlled pressure control valve, particularly pressure shut-off valve, pressure relief valve or pressure reducing valve, comprises master valve with master piston and pilot valve, where master piston is pre-stressed by spring |
-
2011
- 2011-11-02 CN CN201110340981.0A patent/CN103089728B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2230915A1 (en) * | 1973-05-21 | 1974-12-20 | Bennes Marrel | |
| CN2697420Y (en) * | 2004-04-21 | 2005-05-04 | 华中科技大学 | Pre-guiding type water pressure overflow valve |
| CN2804526Y (en) * | 2005-01-21 | 2006-08-09 | 湖南科技大学 | Pilot overflow valve |
| CN201062598Y (en) * | 2007-07-11 | 2008-05-21 | 上海立新液压有限公司 | Pilot discharge valve |
| CN201144914Y (en) * | 2007-12-29 | 2008-11-05 | 上海立新液压有限公司 | Pilot type pressure reducing valve |
| DE102008044800A1 (en) * | 2008-08-28 | 2010-03-04 | Robert Bosch Gmbh | Pilot-controlled pressure control valve, particularly pressure shut-off valve, pressure relief valve or pressure reducing valve, comprises master valve with master piston and pilot valve, where master piston is pre-stressed by spring |
| CN201344292Y (en) * | 2008-12-31 | 2009-11-11 | 中船重工重庆液压机电有限公司 | Large-flow slide valve pilot-operated overflow valve |
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| CN103089728A (en) | 2013-05-08 |
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