CN103790889A - Oil inlet valve block and compound flow control multi-way valve - Google Patents
Oil inlet valve block and compound flow control multi-way valve Download PDFInfo
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- CN103790889A CN103790889A CN201410084394.3A CN201410084394A CN103790889A CN 103790889 A CN103790889 A CN 103790889A CN 201410084394 A CN201410084394 A CN 201410084394A CN 103790889 A CN103790889 A CN 103790889A
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Abstract
The invention provides an oil inlet valve block and a compound flow control multi-way valve and belongs to the field of hydraulic techniques. The problem that an existing multi-way valve is poor in universality is solved. The oil inlet valve block comprises an oil inlet valve body, wherein the oil inlet valve body is provided with a first load-sensitive cavity and a negative flow feedback cavity and is further provided with a load-sensitive interface communicated with the first load-sensitive cavity and a negative flow feedback interface communicated with the negative flow feedback cavity. The negative flow feedback cavity and an oil return cavity are communicated through a throttle valve or are directly communicated. A control structure for controlling whether an oil inlet cavity is communicated with the negative flow feedback cavity or not according to the oil inlet cavity oil pressure and the first load-sensitive cavity oil pressure is arranged in the oil inlet valve body. The compound flow control multi-way valve comprises at least two working valve blocks, an oil return valve block and the oil inlet valve block, adopts downstream pressure compensation and has a flow saturation resisting function, namely flows of execution elements can be distributed proportionally when the system flow is insufficient.
Description
Technical field
The invention belongs to hydraulics field, relate to a kind of hydraulic control valve, particularly a kind of oiling valve piece.
The invention belongs to hydraulics field, relate to a kind of multi-way valve, particularly a kind of compound control flow multi-way valve.
Background technique
Multi-way valve adopts unified modular design, can provide reliable system scheme for the manufacturer of engineering vehicle.User carries out different combinations according to functional requirement to valve body, simple and reliable.Thereby multi-way valve all has application in fields such as excavator, small sized loader, loader-digger, rig, fork truck, ore deposit machine, agricultural machinery.
At present, the hydraulic system using in engineering machinery is mainly quantitative system, minus flow system or load sensitive system.And existing multi-way valve is all only applicable to a kind of hydraulic system in above-mentioned quantitative system, minus flow system or load sensitive system.As everyone knows, construction machinery product model is numerous now, and different models may adopt different hydraulic systems completely; In other words, existing multi-way valve exists the poor problem of versatility.
Summary of the invention
The object of the invention is to have the problems referred to above for existing technology, proposed a kind of oiling valve piece, the technical problem to be solved in the present invention is how to improve the versatility of oiling valve piece.
The invention allows for a kind of compound control flow multi-way valve with above-mentioned oiling valve piece, the technical problem to be solved in the present invention is how to improve the versatility of multi-way valve.
Object of the present invention can realize by following technical proposal: a kind of oiling valve piece, comprise oil-feed valve body, in oil-feed valve body, there is oil suction chamber and oil back chamber, the oil return interface that has the oil-feed interface being connected with oil suction chamber, the oil outlet being connected with oil suction chamber on oil-feed valve body and be connected with oil back chamber; It is characterized in that in oil-feed valve body, also thering is the first load-sensitive chamber and minus flow feedback cavity, on oil-feed valve body, also have the load-sensitive interface being connected with the first load-sensitive chamber and the minus flow feedback interface being connected with minus flow feedback cavity; Between minus flow feedback cavity and oil back chamber, be connected or be directly connected by throttle valve; In oil-feed valve body, be provided with the control structure whether being communicated with minus flow feedback cavity with the first load-sensitive chamber oil pressure control oil suction chamber according to oil suction chamber oil pressure.
The oiling valve piece of said structure is applicable to being applied in minus flow system, and minus flow feedback interface is connected with the corresponding interface of minus flow pump; Load-sensitive interface adopts the shutoff of bolt plug.When being applied in quantitative system, this oiling valve piece adopt bolt plug by load-sensitive interface and the equal shutoff of minus flow feedback interface; And removal throttle valve makes between minus flow feedback cavity and oil back chamber straight-through.When this oiling valve piece is applied in load sensitive system, adopt bolt plug by the shutoff of minus flow feedback interface; And removal throttle valve makes between minus flow feedback cavity and oil back chamber straight-through.
In above-mentioned oiling valve piece, described control structure comprises off-load spool, in oil-feed valve body, offer the valve core channel being all connected with oil suction chamber, the first load-sensitive chamber and minus flow feedback cavity, off-load spool is positioned at valve core channel, in the first load-sensitive chamber, be provided with the first spring, first spring one end and off-load spool lean, and the first spring the other end and oil-feed valve body lean.In the time that oil suction chamber oil pressure raises, promote off-load spool and move along valve core channel inwall, oil suction chamber is connected with minus flow feedback cavity.In the time that the first load-sensitive chamber oil pressure raises, also can promote off-load spool and move along valve core channel inwall, make oil suction chamber and minus flow feedback cavity switch to cut-off state from connected state.
In above-mentioned oiling valve piece, in described oil-feed valve body, have guide slide, in described guide slide, be provided with spring against piece, spring is connected with guide slide inner wall sealing against piece outer side surface, and the described first spring the other end and spring lean against piece one end face; On described oil-feed valve body, be connected with the adjusting bolt leaning against piece other end with spring.Obviously, the first spring the other end leans against piece and adjusting bolt and oil-feed valve body by spring; By screwing the position of adjusting bolt Regulation spring against piece, change the default elastic force of the first spring; And then the oil pressure of change oil suction chamber in the time that oil suction chamber is connected with minus flow feedback cavity.
In above-mentioned oiling valve piece, described throttle valve comprises the throttling valve core with throttle orifice, has the first sealing lip on oil-feed valve body, and the throttle orifice outside of throttling valve core has the second sealing lip; Between described throttling valve core and oil-feed valve body, be provided with the second spring, second spring one end and throttling valve core lean, and the other end and oil-feed valve body lean.When the choke pressure producing by throttle valve when fluid is greater than the default value of elastic of the second spring, the second sealing lip departs from the first sealing lip, and throttle valve is all opened, and realizes overflow, protection pump and reducing the loss.In the time that the oil pressure in minus flow feedback cavity is less than the default value of elastic of the second spring, throttling valve core is under the elastic force effect of the second spring, and the second sealing lip and the first sealing lip lean and form sealing.
For convenient assembling and disassembling throttle valve, in above-mentioned oiling valve piece, on described oil-feed valve body, have handling hole, described handling hole is provided with bolt plug.
A kind of compound control flow multi-way valve, is characterized in that, comprises at least two operating valve pieces, scavenger valve piece and above-mentioned oiling valve piece; Operating valve piece has oil inlet passage, the first oil duct, the second oil duct and drainback passage; In operating valve piece, also there is the load-sensitive oil duct being connected with the second oil duct; In operating valve piece, be provided with and can control the selector valve core structure of oil inlet passage and the first oil duct connected state and can control the first oil duct and the second oil duct connected state and there is the pressure compensation valve core structure in the second load-sensitive chamber; Selector valve core structure also comprises the load-sensitive chamber pressure release oil duct that can make the second oil duct be connected with drainback passage; The oil inlet passage of all working valve piece is all connected with the oil outlet of oiling valve piece; The load-sensitive oil duct of all working valve piece makes the load-sensitive oil duct that in all load-sensitive oil ducts, oil pressure is the highest be connected with the first load-sensitive chamber by shuttle valve oil pressure comparative structure; The second load-sensitive chamber of all working valve piece is all connected with the first load-sensitive chamber.
In the time that the quantity of operating valve piece is two, in above-mentioned compound control flow multi-way valve, described shuttle valve oil pressure comparative structure comprises one group of shuttle valve, shuttle valve has two oil pressure ratios compared with interface and an external interface, external interface is connected with the first load-sensitive chamber, and two oil pressure ratios are connected with the load-sensitive oil duct of two operating valve pieces respectively correspondingly compared with interface.
When the quantity of operating valve piece is when being greater than twice, in above-mentioned compound control flow multi-way valve, described shuttle valve oil pressure comparative structure comprises array shuttle valve, between adjacent two operating valve pieces, is provided with one group of shuttle valve; Shuttle valve has two oil pressure ratios compared with interface and an external interface; All shuttle valves are connected in series, and two oil pressure ratios that are positioned at the shuttle valve of one end are connected with the load-sensitive oil duct of two adjacent operating valve pieces accordingly respectively correspondingly compared with interface, and external interface is connected compared with interface with an oil pressure ratio of adjacent shuttle valve; An oil pressure ratio that is positioned at the shuttle valve of the other end is connected compared with interface with an oil pressure ratio of adjacent shuttle valve compared with interface, another oil pressure ratio is connected with the load-sensitive oil duct of an operating valve piece compared with interface, and the external interface that is positioned at the shuttle valve of the other end is connected with the first load-sensitive chamber.
In above-mentioned compound control flow multi-way valve, described selector valve core structure comprises changeover valve core, on changeover valve core, have the oil-feed circular groove corresponding with oil inlet passage position and the first fuel-displaced circular groove corresponding with the first oil duct position, on changeover valve core outer side surface, also have the throttling groove between oil-feed circular groove and the first fuel-displaced circular groove; Pressure release oil duct in load-sensitive chamber is positioned at changeover valve core.
In above-mentioned compound control flow multi-way valve, described pressure compensation valve core structure comprises pressure compensation spool peace weighing apparatus chamber, pressure-compensated valve in-core has the oil duct that is communicated with that is communicated with the first oil duct and counter balance pocket, is provided with and makes pressure compensation spool have all the time the 3rd spring that compresses counter balance pocket trend in described the second load-sensitive chamber.
In above-mentioned compound control flow multi-way valve, between described the second oil duct and the first oil duct, there are two connecting ports.The second oil duct forms Twin channel oil duct at valve inner, and peak rate of flow is higher, makes along stroke pressure loss less.
Compared with prior art, this compound control flow multi-way valve adopts downstream pressure compensation, has the saturated function of anti-current amount, and, in the time that flow system flow is inadequate, each executive component flow also can be pro rata distributed.
This oiling valve piece and this compound control flow multi-way valve are installed corresponding module by selection and are regulated the force value realization of the first spring to be applied on quantitative system, minus flow system or load sensitive system.
Accompanying drawing explanation
Fig. 1 is the sectional structure schematic diagram of this oiling valve piece.
Fig. 2 is the sectional view of A-A in Fig. 1.
Fig. 3 is that this compound control flow multi-way valve is applied in the hydraulic schematic diagram in embodiment one load sensitive system.
Fig. 4 is this compound control flow multi-way valve embodiment's one structural representation.
Fig. 5 is the sectional structure schematic diagram of operating valve piece in closed condition.
Fig. 6 is the sectional structure schematic diagram of shuttle valve oil pressure comparative structure in embodiment one.
Fig. 7 is the sectional structure schematic diagram of operating valve piece in open mode.
Fig. 8 is the sectional structure schematic diagram of this oiling valve piece in another state.
Fig. 9 is that this oiling valve piece is applied in the sectional structure schematic diagram in embodiment one load sensitive system.
Figure 10 is the sectional structure schematic diagram of scavenger valve piece.
Figure 11 is that this compound control flow multi-way valve is applied in the hydraulic schematic diagram in embodiment four minus flow system.
Figure 12 is that this oiling valve piece is applied in the sectional structure schematic diagram in embodiment four minus flow system.
Figure 13 is that this oiling valve piece is applied in the sectional structure schematic diagram in embodiment three quantitative system.
Figure 14 is this compound control flow multi-way valve embodiment's two hydraulic schematic diagram.
Figure 15 is this compound control flow multi-way valve embodiment's two structural representation.
Figure 16 is the sectional structure schematic diagram of shuttle valve oil pressure comparative structure in embodiment two.
Figure 17 is that this compound control flow multi-way valve is applied in the hydraulic schematic diagram in embodiment three quantitative system.
In figure, 1, oiling valve piece; 1a, oil-feed valve body; 1b, throttle valve; 1b1, throttling valve core; 1b2, the second spring; 1c, oil suction chamber; 1d, oil back chamber; 1e, the first load-sensitive chamber; 1f, minus flow feedback cavity; 1g, oil outlet; 1h, off-load spool; 1i, the first spring; 1j, guide slide; 1k, spring are against piece; 1m, adjusting bolt; 1n, bolt plug; P1, oil-feed interface; T1, oil return interface; LS, load-sensitive interface; FK, minus flow feedback interface; 2, operating valve piece; 2a, oil inlet passage; 2b, the first oil duct; 2c, the second oil duct; 2d, drainback passage; 2e, working hole; 2f, changeover valve core; 2g, throttling groove; 2h, load-sensitive oil duct; 2i, load-sensitive chamber pressure release oil duct; 2j, pressure compensation spool; 2k, the second load-sensitive chamber; 2m, connection oil duct; 2n, the 3rd spring; 3, scavenger valve piece; 4, shuttle valve; 5, the first relief valve; 6, the second relief valve.
Embodiment
Be below specific embodiments of the invention by reference to the accompanying drawings, technological scheme of the present invention is further described, but the present invention be not limited to these embodiments.
Embodiment one
As depicted in figs. 1 and 2, this oiling valve piece 1 comprises oil-feed valve body 1a, throttle valve 1b and control structure.
In oil-feed valve body 1a, there is oil suction chamber 1c, oil back chamber 1d, the first load-sensitive chamber 1e and minus flow feedback cavity 1f.The minus flow feedback interface FK that has the oil-feed interface P1 being connected with oil suction chamber 1c, the oil outlet 1g being connected with oil suction chamber 1c, the oil return interface T1 being connected with oil back chamber 1d, the load-sensitive interface LS being connected with the first load-sensitive chamber 1e on oil-feed valve body 1a and be connected with minus flow feedback cavity 1f.Specifically, minus flow feedback cavity 1f is between oil suction chamber 1c and the first load-sensitive chamber 1e, and whether this layout is more conducive to control structure and is communicated with minus flow feedback cavity 1f with the first load-sensitive chamber 1e oil pressure control oil suction chamber 1c according to oil suction chamber 1c oil pressure; In other words, this layout have reasonable in design, make structure simpler and manipulate advantage more easily.
Control structure comprises off-load spool 1h, in oil-feed valve body 1a, offer the valve core channel being all connected with oil suction chamber 1c, the first load-sensitive chamber 1e and minus flow feedback cavity 1f, off-load spool 1h is positioned at valve core channel, in the first load-sensitive chamber 1e, be provided with the first spring 1i, first spring 1i one end and off-load spool 1h lean, and the first spring 1i the other end and oil-feed valve body 1a lean.As shown in Figure 1, off-load spool 1h is under the effect of the first spring 1i, and the left end of off-load spool 1h and oil-feed valve body 1a lean, and off-load spool 1h makes oil suction chamber 1c and the first load-sensitive chamber 1e in cut-off state.As shown in 8, off-load spool 1h moves to the right, and the first spring 1i is compressed, and oil suction chamber 1c and the first load-sensitive chamber 1e are in connected state.
As shown in Figure 1, as further improvement, in oil-feed valve body 1a, have guide slide 1j, be provided with spring against piece 1k in guide slide 1j, the first spring 1i the other end and spring lean against piece 1k mono-end face; On oil-feed valve body 1a, be connected with the adjusting bolt 1m leaning against piece 1k other end with spring; Obviously, the first spring 1i the other end leans against piece 1k and adjusting bolt 1m and oil-feed valve body 1a by spring.Change the default elastic force of the first spring 1i by screwing adjusting bolt 1m; And then the oil pressure of change oil suction chamber 1c in the time that oil suction chamber 1c is connected with minus flow feedback cavity 1f; Make thus this oiling valve piece 1 mate more suitably from different hydraulic systems.In other words, said structure be set effectively guaranteed the versatility of oil-feed valve body 1a.Spring is connected with guide slide 1j inner wall sealing against piece 1k outer side surface, and specifically, spring has annular seal groove on piece 1k outer side surface, has seal ring in annular seal groove inner sleeve.Above-mentioned sealing configuration guarantees that spring can slide against piece 1k effectively, can avoid again hydraulic oil to reveal.
As shown in Figure 2, between minus flow feedback cavity 1f and oil back chamber 1d, be connected by throttle valve 1b.As shown in Figure 12 and Figure 13, between minus flow feedback cavity 1f and oil back chamber 1d, be directly connected.Throttle valve 1b comprises the throttling valve core 1b1 with throttle orifice, on oil-feed valve body 1a, has the first sealing lip, and the throttle orifice outside of throttling valve core 1b1 has the second sealing lip; Between described throttling valve core 1b1 and oil-feed valve body 1a, be provided with the second spring 1b2, second spring 1b2 one end and throttling valve core 1b1 lean, and the other end and oil-feed valve body 1a lean.When the choke pressure producing by throttle valve 1b when fluid is greater than the default value of elastic of the second spring 1b2, the second sealing lip departs from the first sealing lip, and throttle valve 1b all opens, and realizes overflow, protection pump and reducing the loss.
For convenient assembling and disassembling throttle valve 1b, on oil-feed valve body 1a, have handling hole, handling hole is provided with bolt plug 1n.Bolt plug 1n is provided with pilot hole, and throttling valve core 1b1 is cylindrical, and throttling valve core 1b1 penetrates in pilot hole, in the time that throttling valve core 1b1 moves, just moves along pilot hole sidewall; The second spring 1b2 can be arranged in throttling valve core 1b1 and pilot hole, guarantee structural compactness simultaneously; Effectively improve the stability that throttling valve core 1b1 moves, and then guarantee the stability of throttle valve 1b.
As shown in Figures 3 to 6, this compound control flow multi-way valve comprises two operating valve pieces 2, scavenger valve piece 3 and an above-mentioned oiling valve piece 1; Fold and establish by oiling valve piece 1, operating valve piece 2, operating valve piece 2 and scavenger valve piece 3 orders successively from a side to opposite side.
As shown in Figure 5, operating valve piece 2 has oil inlet passage 2a, the first oil duct 2b, the second oil duct 2c, drainback passage 2d and two working hole 2e.In operating valve piece 2, be equipped with the selector valve core structure that can control oil inlet passage 2a and the first oil duct 2b connected state and the pressure compensation valve core structure that can control the first oil duct 2b and the second oil duct 2c connected state.
Selector valve core structure comprises changeover valve core 2f, on changeover valve core 2f, have the oil-feed circular groove corresponding with oil inlet passage 2a position, with corresponding the first fuel-displaced circular groove in the first oil duct 2b position and with two working hole 2e positions the second fuel-displaced circular groove one to one.On changeover valve core 2f outer side surface, also have the throttling groove 2g between oil-feed circular groove and the first fuel-displaced circular groove.
In operating valve piece 2, also there is the load-sensitive oil duct 2h being connected with the second oil duct 2c; In changeover valve core 2f, offer an energy load-sensitive chamber pressure release oil duct 2i; When the first oil duct 2b and the second oil duct 2c are during in cut-off state, load-sensitive chamber pressure release oil duct 2i makes the second oil duct 2c be connected with drainback passage 2d; When the first oil duct 2b and the second oil duct 2c are during in connected state, load-sensitive chamber pressure release oil duct 2i is in cut-off state, and the fluid of the second oil duct 2c cannot enter in drainback passage 2d by load-sensitive chamber pressure release oil duct 2i.
Pressure compensation valve core structure comprises pressure compensation spool 2j, counter balance pocket and the second load-sensitive chamber 2k.Specifically, pressure compensation spool 2j is arranged in the valve body of operating valve piece 2, forms counter balance pocket and the second load-sensitive chamber 2k between the two ends of pressure compensation spool 2j and the valve body of operating valve piece 2.On pressure compensation spool 2j, offer be communicated with the first oil duct 2b and counter balance pocket be communicated with oil duct 2m.In the second load-sensitive chamber 2k, be provided with the 3rd spring 2n that makes pressure compensation spool 2j there is all the time compression counter balance pocket trend.As shown in Figure 5, pressure compensation spool 2j makes the second oil duct 2c and the first oil duct 2b in cut-off state.As shown in Figure 7, the second oil duct 2c and the first oil duct 2b are in connected state.
As shown in Figure 5, the second oil duct 2c is U-shaped, between the second oil duct 2c and the first oil duct 2b, has two connecting ports.When the second oil duct 2c and the first oil duct 2b are during in connected state, two connecting ports are higher with respect to a connecting port peak rate of flow, and then make along stroke pressure loss less.
As shown in Fig. 3, Figure 11 to Figure 14, the oil inlet passage 2a of all working valve piece 2 is all connected with the oil outlet 1g of oiling valve piece 1.The second load-sensitive chamber 2k of all working valve piece 2 is all connected with the first load-sensitive chamber 1e.The load-sensitive oil duct 2h of all working valve piece 2 makes the load-sensitive oil duct 2h that in all load-sensitive oil duct 2h, oil pressure is the highest be connected with the first load-sensitive chamber 1e by shuttle valve oil pressure comparative structure.
As shown in Figure 6, shuttle valve oil pressure comparative structure comprises one group of shuttle valve 4, shuttle valve 4 has two oil pressure ratios compared with interface and an external interface, external interface is connected with the first load-sensitive chamber 1e, and two oil pressure ratios are connected with the load-sensitive oil duct 2h of two operating valve pieces 2 respectively correspondingly compared with interface.
As shown in Fig. 3, Figure 11 to Figure 14, the operating valve piece 2 of close scavenger valve piece 3 is for Control Engineering machinery rotation.As shown in figure 10, the first relief valve 5 being connected with the load-sensitive oil duct 2h of the operating valve piece 2 for Control Engineering machinery rotation is set on scavenger valve piece 3.Engineering machinery especially time in excavator when work nearly 50% in revolution, because revolution inertia ratio is larger, cause revolution to start and anxious stopping time pressure ratio higher, effectively restriction rotation pressure of the first relief valve 5, effectively reduces revolution and impacts.Meanwhile, when other action composite moves, avoid causing its pressure reduction to become large because revolution instantaneous pressure rises, cause system heating.
As shown in Figures 1 to 9, when this oiling valve piece 1 and this compound control flow multi-way valve are applied in load sensitive system, adopt bolt plug 1n by minus flow feedback interface FK shutoff; And removal throttle valve 1b makes between minus flow feedback cavity 1f and oil back chamber 1d straight-through.
In the time that the changeover valve core 2f in all working valve piece 2 is positioned at meta, because the load-sensitive chamber pressure release oil duct 2i in operating valve piece 2 makes the second oil duct 2c be connected with drainback passage 2d, the first load-sensitive chamber 1e is connected with the second oil duct 2c by shuttle valve oil pressure comparative structure and load-sensitive oil duct 2h; Therefore the first load-sensitive chamber 1e is connected with drainback passage 2d.
Now load sensitive pump is with the fluid output of minimum discharge.Because the changeover valve core 2f in operating valve piece 2 is positioned at meta, seal to working hole 2e oil circuit, so pumping pressure raises.Between off-load spool 1h left end and oil-feed valve body 1a, form oil pressure ratio compared with chamber, off-load spool 1h left end has and is communicated with oil pressure ratio compared with the aperture of chamber and oil suction chamber 1c; Fluid arrives oil pressure ratio compared with chamber by the aperture on off-load spool 1h, until be greater than the first spring 1i setting of off-load spool 1h right-hand member, off-load spool 1h starts to move right, and oil suction chamber 1c and oil back chamber 1d connect, until stop when off-load spool 1h pressure at two ends balance mobile.Pump oilyly realizes meta off-load through off-load spool 1h to the oil return interface T1 case that deoils like this.
As shown in Figure 7, in the time that the changeover valve core 2f of single operating valve piece 2 is positioned at commutation position, oil inlet passage 2a is connected with the first oil duct 2b by the throttling groove 2g on changeover valve core 2f, arrive by the connection oil duct 2m on pressure compensation spool 2j the counter balance pocket that is positioned at pressure compensation spool 2j left end again, in the time that counter balance pocket pressure is greater than the 3rd spring 2n pressure that is positioned at pressure compensation spool 2j right-hand member, pressure compensation spool 2j moves right, now the first oil duct 2b is connected with the second oil duct 2c, the fluid major part of the second oil duct 2c flows to one of them working hole 2e, another working hole 2e fluid flows to drainback passage 2d.The fluid of the second oil duct 2c has sub-fraction to open shuttle valve 4 diffluence the first load-sensitive chamber 1e by load-sensitive oil duct 2h.Off-load spool 1h in oiling valve piece 1 moves to left under the oil pressure effect of the first spring 1i spring force and the first load-sensitive chamber 1e, disconnects the oil suction chamber 1c of oiling valve piece 1 and the connection of oil back chamber 1d.Because the second load-sensitive chamber 2k of operating valve piece 2 is all connected with the first load-sensitive chamber 1e of oiling valve piece 1, the pressure compensation spool 2j in operating valve piece 2 moves to left under the oil pressure effect of the 3rd spring 2n and the second load-sensitive chamber 2k, until pressure compensation spool 2j pressure at two ends equates to reach balance, the oil pressure that now pressure of the first oil duct 2b equals the second load-sensitive chamber 2k adds the pressure of the 3rd spring 2n, so the pressure reduction of oil inlet passage 2a and the first oil duct 2b just equals the spring setting of load-sensitive pump flow control valve, thereby the flow of the first oil duct 2b is only relevant to the throttling groove 2g opening area on changeover valve core 2f.
Oil liquid pressure in the first load-sensitive chamber 1e is too high, is provided with the second relief valve 6 being connected with the first load-sensitive chamber 1e in oiling valve piece 1.
In the time that the changeover valve core 2f of operating valve piece 2 switches to meta from commutation position, switch to closed condition from operating valve piece 2 from open mode.Oil inlet passage 2a and the first oil duct 2b disconnect, and pressure compensation spool 2j makes the first oil duct 2b and the second oil duct 2c disconnect under the effect of the 3rd spring 2n.Because the second load-sensitive chamber 2k and the second oil duct 2c are all connected with the first load-sensitive chamber 1e, and the second oil duct 2c is connected with drainback passage by the load-sensitive chamber pressure release oil duct 2i on changeover valve core 2f, thereby discharge the residual pressure of closing suddenly generation due to commutation valve rod.
In the time that two operating valve pieces 2 are worked simultaneously, under the effect at shuttle valve oil pressure comparative structure, only have the fluid that induced pressure is the highest can arrive the first load-sensitive chamber 1e, because the second load-sensitive chamber 2k in all working valve piece 2 is all directly communicated with the first load-sensitive chamber 1e, therefore the compensating spool automatic position adjusting function that induced pressure is little, make the first oil duct 2b and the second oil duct 2c produce pressure reduction, add the pressure of the 3rd spring 2n until the first oil duct 2b pressure equals the second load-sensitive chamber 2k pressure.So the pressure reduction of oil inlet passage 2a and the first oil duct 2b just equals the spring setting of load-sensitive pump flow control valve when each operating valve piece 2 loaded work piece, thereby the flow of the first oil duct 2b is only relevant to the throttling groove 2g opening area of commutation valve rod.
Embodiment two
The present embodiment is basic identical with embodiment one structure and principle, and different place is: as shown in Figure 14 to Figure 16, this compound control flow multi-way valve comprises seven operating valve pieces 2, scavenger valve piece 3 and an above-mentioned oiling valve piece 1; Oiling valve piece 1 and scavenger valve piece 3 lay respectively at both sides; In other words, fold and establish by oiling valve piece 1, the first operating valve piece 2, the second operating valve piece 2, the 3rd operating valve piece 2, the 4th operating valve piece 2, the 5th operating valve piece 2, the 6th operating valve piece 2, the 7th operating valve piece 2 and scavenger valve piece 3 orders successively from a side to opposite side.
Shuttle valve oil pressure comparative structure comprises six groups of shuttle valves 4, between adjacent two operating valve pieces 2, is provided with one group of shuttle valve 4; Shuttle valve 4 has two oil pressure ratios compared with interface and an external interface; All shuttle valves 4 are connected in series.Specifically, two oil pressure ratios of the shuttle valve 4 between the 6th operating valve piece 2 and the 7th operating valve piece 2 are connected with the load-sensitive oil duct 2h of the 6th operating valve piece 2 and the 7th operating valve piece 2 respectively correspondingly compared with interface.
An oil pressure ratio at the shuttle valve 4 between the 5th operating valve piece 2 and the 6th operating valve piece 2 is connected with the external interface of the shuttle valve 4 between the 6th operating valve piece 2 and the 7th operating valve piece 2 compared with interface, and another oil pressure ratio of the shuttle valve 4 between the 5th operating valve piece 2 and the 6th operating valve piece 2 is connected with the load-sensitive oil duct 2h of the 5th operating valve piece 2 compared with interface.
All connect by said structure from the shuttle valve 4 between the 5th operating valve piece 2 and the 6th operating valve piece 2 to the shuttle valve 4 being positioned between the first operating valve piece 2 and the second operating valve piece 2; An oil pressure ratio of the shuttle valve 4 between N operating valve piece 2 and N+1 operating valve piece 2 is connected with the external interface of the shuttle valve 4 between N+1 operating valve piece 2 and N+2 operating valve piece 2 compared with interface, and another oil pressure ratio of the shuttle valve 4 between N operating valve piece 2 and N+1 operating valve piece 2 is connected with the load-sensitive oil duct 2h of N operating valve piece 2 compared with interface; And the external interface that is positioned at the shuttle valve 4 of one end is connected with the first load-sensitive chamber 1e; An oil pressure ratio that is positioned at the shuttle valve 4 of the other end is connected with the load-sensitive oil duct 2h of last operating valve piece 2 compared with interface.
In the time that multiple operating valve pieces 2 are worked simultaneously, under the effect at shuttle valve oil pressure comparative structure, only have the fluid that induced pressure is the highest can arrive the first load-sensitive chamber 1e, because the second load-sensitive chamber 2k in all working valve piece 2 is all directly communicated with the first load-sensitive chamber 1e, therefore the compensating spool automatic position adjusting function that induced pressure is little, make the first oil duct 2b and the second oil duct 2c produce pressure reduction, add the pressure of the 3rd spring 2n until the first oil duct 2b pressure equals the second load-sensitive chamber 2k pressure.So the pressure reduction of oil inlet passage 2a and the first oil duct 2b just equals the spring setting of load-sensitive pump flow control valve when each operating valve piece 2 loaded work piece, thereby the flow of the first oil duct 2b is only relevant to the throttling groove 2g opening area of commutation valve rod.
Embodiment three
The present embodiment is basic identical with embodiment one or embodiment's two structure and principle, different place is: as shown in Figure 13 and Figure 17, when this oiling valve piece 1 and this compound control flow multi-way valve are applied in quantitative system, adopt bolt plug 1n by load-sensitive interface LS and the equal shutoff of minus flow feedback interface FK; And removal throttle valve 1b makes between minus flow feedback cavity 1f and oil back chamber 1d straight-through.
Embodiment four
The present embodiment is basic identical with embodiment one or embodiment's two structure and principle, different place is: as shown in Figure 11 and Figure 12, this oiling valve piece 1 and this compound control flow multi-way valve are applied in variable system, and minus flow feedback interface FK is connected with the corresponding interface of minus flow pump; Load-sensitive interface LS adopts bolt plug 1n shutoff.Determine the pressure reduction of operating valve piece 2 oil inlet passage 2a and the first oil duct 2b by setting up the value of the first spring 1i.In the time that the flow of pump output is greater than the flow of system needs, the pressure reduction of operating valve piece 2 oil inlet passage 2a and the first oil duct 2b is greater than spring setting, off-load spool 1h moves right, oil suction chamber 1c is connected with minus flow feedback cavity 1f, the fluid of minus flow feedback cavity 1f produces choke pressure by throttle valve 1b, choke pressure feeds back excuse by minus flow and feeds back on minus flow pump, regulates pump swash plate, and flow is reduced.When the choke pressure producing by throttle valve 1b when fluid is greater than the second spring 1b2 setting value, throttle valve 1b all opens, and realizes overflow, protection pump and reducing the loss.
Claims (10)
1. an oiling valve piece, comprise oil-feed valve body (1a), in oil-feed valve body (1a), there is oil suction chamber (1c) and oil back chamber (1d), the oil return interface (T1) that has the oil-feed interface (P1) being connected with oil suction chamber (1c), the oil outlet (1g) being connected with oil suction chamber (1c) on oil-feed valve body (1a) and be connected with oil back chamber (1d); It is characterized in that, in oil-feed valve body (1a), also there is the first load-sensitive chamber (1e) and minus flow feedback cavity (1f), on oil-feed valve body (1a), also have the load-sensitive interface (LS) being connected with the first load-sensitive chamber (1e) and the minus flow feedback interface (FK) being connected with minus flow feedback cavity (1f); Between minus flow feedback cavity (1f) and oil back chamber (1d), be connected or be directly connected by throttle valve (1b); In oil-feed valve body (1a), be provided with the control structure whether being communicated with minus flow feedback cavity (1f) with the first load-sensitive chamber (1e) oil pressure control oil suction chamber (1c) according to oil suction chamber (1c) oil pressure.
2. oiling valve piece according to claim 1, it is characterized in that, described control structure comprises off-load spool (1h), in oil-feed valve body (1a), offer the valve core channel being all connected with oil suction chamber (1c), the first load-sensitive chamber (1e) and minus flow feedback cavity (1f), off-load spool (1h) is positioned at valve core channel, in the first load-sensitive chamber (1e), be provided with the first spring (1i), the first spring (1i) one end and off-load spool (1h) lean, and the first spring (1i) the other end and oil-feed valve body (1a) lean.
3. oiling valve piece according to claim 1, it is characterized in that, described control structure comprises off-load spool (1h), in oil-feed valve body (1a), offer the valve core channel being all connected with oil suction chamber (1c), the first load-sensitive chamber (1e) and minus flow feedback cavity (1f), off-load spool (1h) is positioned at valve core channel, in the first load-sensitive chamber (1e), be provided with the first spring (1i), the first spring (1i) one end and off-load spool (1h) lean; In oil-feed valve body (1a), have guide slide (1j), in described guide slide (1j), be provided with spring against piece (1k), spring is connected with guide slide (1j) inner wall sealing against piece (1k) outer side surface, and described the first spring (1i) the other end and spring lean against piece (1k) end face; On described oil-feed valve body (1a), be connected with the adjusting bolt (1m) leaning against piece (1k) other end with spring.
4. according to the oiling valve piece described in claim 1 or 2 or 3, it is characterized in that, described throttle valve (1b) comprises the throttling valve core (1b1) with throttle orifice, on oil-feed valve body (1a), has the first sealing lip, and the throttle orifice outside of throttling valve core (1b1) has the second sealing lip; Between described throttling valve core (1b1) and oil-feed valve body (1a), be provided with the second spring (1b2), the second spring (1b2) one end and throttling valve core (1b1) lean, and the other end and oil-feed valve body (1a) lean.
5. oiling valve piece according to claim 4, is characterized in that, on described oil-feed valve body (1a), has handling hole, and described handling hole is provided with bolt plug (1n).
6. a compound control flow multi-way valve, is characterized in that, comprises at least two operating valve pieces (2), scavenger valve piece (3) and above-mentioned oiling valve piece (1); Operating valve piece (2) has oil inlet passage (2a), the first oil duct (2b), the second oil duct (2c) and drainback passage (2d); In operating valve piece (2), also there is the load-sensitive oil duct (2h) being connected with the second oil duct (2c); In operating valve piece (2), be equipped with and can control the selector valve core structure of oil inlet passage (2a) and the first oil duct (2b) connected state and can control the first oil duct (2b) and the second oil duct (2c) connected state and there is the pressure compensation valve core structure in the second load-sensitive chamber (2k); Selector valve core structure also comprises the load-sensitive chamber pressure release oil duct (2i) that can make the second oil duct (2c) be connected with drainback passage (2d); The oil inlet passage (2a) of all working valve piece (2) is all connected with the oil outlet (1g) of oiling valve piece (1); The load-sensitive oil duct (2h) of all working valve piece (2) makes the highest load-sensitive oil duct (2h) of oil pressure in all load-sensitive oil ducts (2h) be connected with the first load-sensitive chamber (1e) by shuttle valve oil pressure comparative structure; The second load-sensitive chamber (2k) of all working valve piece (2) is all connected with the first load-sensitive chamber (1e).
7. compound control flow multi-way valve according to claim 6, it is characterized in that, described shuttle valve oil pressure comparative structure comprises one group of shuttle valve (4), shuttle valve (4) has two oil pressure ratios compared with interface and an external interface, external interface is connected with the first load-sensitive chamber (1e), and two oil pressure ratios are connected with the load-sensitive oil duct (2h) of two operating valve pieces (2) respectively correspondingly compared with interface.
8. compound control flow multi-way valve according to claim 6, is characterized in that, described shuttle valve oil pressure comparative structure comprises array shuttle valve (4), is provided with one group of shuttle valve (4) between adjacent two operating valve pieces (2); Shuttle valve (4) has two oil pressure ratios compared with interface and an external interface; All shuttle valves (4) are connected in series, an oil pressure ratio that is positioned at the shuttle valve (4) between N operating valve piece (2) and N+1 operating valve piece (2) is connected with the external interface that is positioned at the shuttle valve (4) between N+1 operating valve piece (2) and N+2 operating valve piece (2) compared with interface, and another oil pressure ratio that is positioned at the shuttle valve (4) between N operating valve piece (2) and N+1 operating valve piece (2) is connected with the load-sensitive oil duct (2h) of N operating valve piece (2) compared with interface; And the external interface that is positioned at the shuttle valve (4) of one end is connected with the first load-sensitive chamber (1e); An oil pressure ratio that is positioned at the shuttle valve (4) of the other end is connected with the load-sensitive oil duct (2h) of last operating valve piece (2) compared with interface.
9. according to the compound control flow multi-way valve described in claim 6 or 7 or 8, it is characterized in that, described selector valve core structure comprises changeover valve core (2f), on changeover valve core (2f), have the oil-feed circular groove corresponding with oil inlet passage (2a) position and the first fuel-displaced circular groove corresponding with the first oil duct (2b) position, on changeover valve core (2f) outer side surface, also have the throttling groove (2g) between oil-feed circular groove and the first fuel-displaced circular groove; Load-sensitive chamber pressure release oil duct (2i) is positioned at changeover valve core (2f).
10. according to the compound control flow multi-way valve described in claim 6 or 7 or 8, it is characterized in that, described pressure compensation valve core structure comprises pressure compensation spool (2j) and counter balance pocket, in pressure compensation spool (2j), have be communicated with the first oil duct (2b) and counter balance pocket be communicated with oil duct (2m), in described the second load-sensitive chamber (2k), be provided with and make pressure compensation spool (2j) there is all the time the 3rd spring (2n) that compresses counter balance pocket trend.
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| CN201410084394.3A CN103790889B (en) | 2014-03-10 | 2014-03-10 | Oiling valve block and complex controll flow multi-way valve |
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| CN201410084394.3A CN103790889B (en) | 2014-03-10 | 2014-03-10 | Oiling valve block and complex controll flow multi-way valve |
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| CN104214159A (en) * | 2014-09-02 | 2014-12-17 | 徐州徐工液压件有限公司 | Anti-flow-saturation valve with mechano-hydraulic stroke limiting function |
| CN104481951A (en) * | 2014-12-05 | 2015-04-01 | 西安航空动力控制科技有限公司 | Multi-way valve spool |
| CN105003710A (en) * | 2015-07-23 | 2015-10-28 | 山东临工工程机械有限公司 | Valve body structure and valve assembly universally used for positive flow and negative flow |
| CN106050779A (en) * | 2016-07-18 | 2016-10-26 | 江苏恒立液压科技有限公司 | Multi-way valve of forklift |
| CN106917872A (en) * | 2015-12-23 | 2017-07-04 | 罗伯特·博世有限公司 | Mould component with underground |
| CN106917873A (en) * | 2015-12-23 | 2017-07-04 | 罗伯特·博世有限公司 | Mould component with underground |
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| CN110388343A (en) * | 2018-04-18 | 2019-10-29 | 北京华德液压工业集团有限责任公司 | A kind of big flow single channel double overflow three-way pressure compensating device |
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| CN104088841A (en) * | 2014-06-26 | 2014-10-08 | 徐州徐工液压件有限公司 | Load sensitive hydraulic system and load sensitive valve thereof |
| CN104214159A (en) * | 2014-09-02 | 2014-12-17 | 徐州徐工液压件有限公司 | Anti-flow-saturation valve with mechano-hydraulic stroke limiting function |
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| CN106917872A (en) * | 2015-12-23 | 2017-07-04 | 罗伯特·博世有限公司 | Mould component with underground |
| CN106917873A (en) * | 2015-12-23 | 2017-07-04 | 罗伯特·博世有限公司 | Mould component with underground |
| CN106050779A (en) * | 2016-07-18 | 2016-10-26 | 江苏恒立液压科技有限公司 | Multi-way valve of forklift |
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| CN110388343A (en) * | 2018-04-18 | 2019-10-29 | 北京华德液压工业集团有限责任公司 | A kind of big flow single channel double overflow three-way pressure compensating device |
| CN109737111A (en) * | 2019-01-28 | 2019-05-10 | 日照海卓液压有限公司 | It is a kind of with the multi-way valve based on one-way or bi-directional hydraulic lock consubstantiality repairing function |
| CN109751291A (en) * | 2019-01-28 | 2019-05-14 | 日照海卓液压有限公司 | A kind of interior multi-way valve that system is waken up with energy of commutation work connection |
| CN109737111B (en) * | 2019-01-28 | 2024-01-02 | 日照海卓液压有限公司 | Multi-way valve with one-way or two-way hydraulic lock integrated oil supplementing function |
| CN109751291B (en) * | 2019-01-28 | 2024-01-02 | 日照海卓液压有限公司 | Multi-way valve with energy awakening system in reversing working unit |
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