CN201547043U - Split ratio load sensitive multi-way valve having small load and self compensation - Google Patents
Split ratio load sensitive multi-way valve having small load and self compensation Download PDFInfo
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- CN201547043U CN201547043U CN200920198727XU CN200920198727U CN201547043U CN 201547043 U CN201547043 U CN 201547043U CN 200920198727X U CN200920198727X U CN 200920198727XU CN 200920198727 U CN200920198727 U CN 200920198727U CN 201547043 U CN201547043 U CN 201547043U
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- 239000012530 fluid Substances 0.000 claims description 103
- 239000000945 filler Substances 0.000 claims description 25
- 238000013016 damping Methods 0.000 claims description 7
- 230000035945 sensitivity Effects 0.000 abstract description 5
- 239000003921 oil Substances 0.000 description 13
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Abstract
The utility model discloses a split ratio load sensitive multi-way valve having a small load and self compensation. The valve is formed by orderly connecting a heavy load valve block, a load sensitive pressure signal selecting valve block, a small load valve block and a general load valve block. All the loading pressure scopes of the split ratio load sensitive multi-way valve can be foreseen so increasing a minimum differential pressure at two ends of a throttle port or not is determined by comparing the maximum and minimum differential pressures. When a differential pressure value of the two loading pressures is smaller than a set value, the small loaded differential pressure at the throttle port is sufficient so the differential pressure is not increased. When the differential pressure value of the two loading pressures is bigger than a set value, the small loaded differential pressure at the throttle port has affected the sensitivity of a valve rod and the harmony of the whole engine so the differential pressure at the throttle port is increased and the increased value thereof is the differential value of the maximum and minimum differential pressures. Therefore, the sensitivity of the valve rod is ensured and the harmony of the whole engine is promoted when the differential pressure of different loads is rather big.
Description
Technical field
The utility model relates to a kind of engineering machinery and other mechanical split ratio load-sensitive hydraulic systems of being used for, and relates in particular to a kind of little load split ratio load sensing multi-way valve of compensation automatically that has.
Background technique
In the split ratio load sensitive system, because highest load pressure controls recuperation valve and variable displacement pump simultaneously, on the one hand, variable displacement pump is the required hydraulic power of output system only almost, has reduced power loss to greatest extent.On the other hand, utilize the effect of the load balancing of recuperation valve, the pressure reduction at all operations valve two ends equates that all this moment is only relevant with the stroke of handling valve rod through the flow of multi-way valve.When the required flow of load during, each valve pro-rata flow, thereby guarantee the harmony of each mechanism's work greater than the peak rate of flow of variable displacement pump, and irrelevant with the load size.
Yet in the actual application of traditional split ratio load sensing multi-way valve, find, when existence differs bigger two loads and heavy load pressure near the Maximum operating pressure of variable displacement pump, owing to select for use the maximum load pressure signal to control each recuperation valve in the split ratio load sensitive system, therefore through behind the pressure compensation, every outlet pressure all is the same, corresponding pressure reduction also is the same, cause the pressure reduction that comprises each the load interlink head piece of little load in being associated in all to become very little, it is very low that the movement velocity of correspondingly every joint control system all becomes.Yet in order to guarantee the sports coordination of machine, but be to need little load connection to have a higher relatively speed under many circumstances.In order to improve the movement velocity of little load, the staff transfers to maximum to the working stroke of little load connection valve rod usually, however the working flow increment of little load connection and not obvious.Therefore, when the sensitivity that reduces valve rod and increasing staff's operation easier, the work coordination of each mechanism of machinery is greatly reduced.
The model utility content
The purpose of this utility model is at the deficiencies in the prior art, and a kind of little load split ratio load sensing multi-way valve with the automatic compensation of little load of compensation automatically that has is provided.
The purpose of this utility model is achieved through the following technical solutions: a kind of split ratio load sensing multi-way valve with the automatic compensation of little load, it mainly selects valve block, little load valve block and conventional load valve block to be connected to form successively by heavy load valve block, load-sensitive pressure signal.
Further, described heavy load valve block, little load valve block and conventional load valve block include valve body, valve core of main valve, spring, one-way valve, recuperation valve spool, screw, seal ring and two plugs.Wherein, valve body comprises endoporus, filler opening, return opening, actuator port, first flow, second runner, the 3rd runner, the 4th runner, the 5th runner, the 6th runner, the 7th runner, the 8th runner, the 9th runner, the tenth runner.Recuperation valve inner chamber, damping hole and radial bore are arranged in the recuperation valve spool.Valve body has endoporus, and this endoporus is equipped with valve core of main valve, and the inlet cavity volume links to each other with recuperation valve lower end cavity volume by valve port, first flow.Recuperation valve lower end cavity volume communicates with radial bore through recuperation valve inner chamber, damping hole.Screw is connected with valve seal by seal ring, and links to each other with recuperation valve spool top by spring.Second runner links to each other with the 3rd runner, the 4th runner by one-way valve.The 3rd runner links to each other with the 6th runner by the valve core of main valve opening, communicates with actuator port through the 5th runner again.The five-way road communicates with the 7th runner through the opening of valve core of main valve, and finally links to each other with return opening; The 4th runner communicates with the 8th runner by the opening of valve core of main valve, links to each other with actuator port through the 9th runner again.The 9th runner communicates with the tenth runner through the opening of valve core of main valve, and finally links to each other with return opening.
Further,, described heavy load valve block also comprises the first load-sensitive pressure signal hydraulic fluid port, the 11 runner and the first induced pressure hydraulic fluid port.The described first load-sensitive pressure signal hydraulic fluid port links to each other with the first load-sensitive chamber by the 11 runner, and the 3rd runner, the 4th runner all communicate with the first induced pressure hydraulic fluid port.
Further,, described little load valve block also comprises the responsive pressure signal hydraulic fluid port of the second load-sensitive pressure signal hydraulic fluid port, the 12 runner and second maximum load.The described second load-sensitive pressure signal hydraulic fluid port links to each other with the second load-sensitive chamber by the 12 runner.The responsive pressure signal hydraulic fluid port of second maximum load is arranged on valve body.
Further,, described conventional load valve block also comprises responsive pressure signal hydraulic fluid port of the 3rd maximum load and the 13 runner.The responsive pressure signal hydraulic fluid port of described the 3rd maximum load communicates with the 3rd load-sensitive chamber by the 13 runner.
Further,, described load-sensitive pressure signal selects valve block to comprise valve body, first selector valve and second selector valve.Valve body comprises endoporus, filler opening, return opening, the 14 runner, the 15 runner, the 16 runner, the 17 runner, the 18 runner, first oil back chamber, second oil back chamber, the first meta drain tap, the second meta drain tap, second annular groove, the 3rd annular groove, the second induced pressure hydraulic fluid port, the 4th induced pressure hydraulic fluid port, selector valve first filler opening, selector valve second filler opening, the responsive pressure signal hydraulic fluid port of first maximum load, the second load-sensitive pressure signal hydraulic fluid port, the 4th load-sensitive pressure signal hydraulic fluid port.First selector valve, second selector valve include two position three way directional control valve spool, nut, nut, expansion screw, end seat, the 3rd spring, spring seat.Second load pressure signal communicates with first load pressure signal of heavy load valve block.The second induced pressure hydraulic fluid port links to each other with selector valve first filler opening, the first change-over valve core epicoele and the second change-over valve core cavity of resorption of first selector valve respectively by the 14 runner; The 4th induced pressure hydraulic fluid port communicates with the 3rd induced pressure hydraulic fluid port of little load valve block.The 4th induced pressure hydraulic fluid port links to each other with selector valve second filler opening, the second change-over valve core epicoele and the first change-over valve core cavity of resorption of second selector valve respectively by the 15 runner.Second annular groove of first selector valve links to each other with the second load-sensitive pressure signal hydraulic fluid port by the 16 runner, and the 3rd annular groove of second selector valve links to each other with the 4th load-sensitive pressure signal hydraulic fluid port by the 17 runner.The second induced pressure hydraulic fluid port links to each other with return opening through first oil back chamber, the first meta drain tap.The 4th induced pressure hydraulic fluid port links to each other with return opening through second oil back chamber, the second meta drain tap.Selector valve second filler opening of first selector valve links to each other by the 18 runner with selector valve second filler opening of second selector valve, and the 18 runner communicates with the responsive pressure signal hydraulic fluid port of first maximum load simultaneously.The responsive pressure signal hydraulic fluid port of first maximum load communicates with the 3rd load-sensitive chamber of conventional load valve block by the responsive pressure signal hydraulic fluid port of the 3rd maximum load, the 13 runner of the responsive pressure signal hydraulic fluid port of second maximum load of little load valve block, conventional load valve block.
The utility model compared with prior art, the beneficial effect that has is: because the induced pressure scope that respectively joins of split ratio load sensing multi-way valve is predictable, determine whether increasing the restriction two ends pressure reduction of minimum load connection by relatively more maximum difference with minimum load pressure.When two induced pressure differences during less than setting value, illustrate that the restriction pressure reduction of little load connection is enough big, do not need to make its increase; When two induced pressure differences during greater than setting value, the little harmony to sensitivity that has influenced valve rod and complete machine work of restriction pressure reduction of little load connection is described, increase the pressure reduction of this restriction at this moment, the increment of its pressure reduction just is the difference of big or small induced pressure.Thereby when different loads connection pressure reduction is big, guaranteed the sensitivity of valve rod, improved the harmony of complete machine work.
Description of drawings
Fig. 1 is the sectional drawing of heavy load valve block;
Fig. 2 is the sectional drawing that the load-sensitive pressure signal is selected valve block;
Fig. 3 is the sectional drawing of little load valve block;
Fig. 4 is the sectional drawing of conventional load valve block;
Fig. 5 is a fundamental diagram of the present utility model.
Embodiment
Describe the utility model below with reference to the accompanying drawings in detail, it is more obvious that the purpose of this utility model and effect will become.
As shown in the figure, the split ratio load sensing multi-way valve that the utlity model has the automatic compensation of little load mainly selects valve block, little load valve block and conventional load valve block to be connected to form successively by heavy load valve block, load-sensitive pressure signal, and they connect by bolt at four bolt hole places.
As shown in Figure 1, the heavy load valve block comprises valve body 101, valve core of main valve 103, first spring 114, one-way valve 121, recuperation valve spool 129, screw 160 and plug 146,147.Wherein, valve body 101 comprises endoporus 104, filler opening 105, return opening 102, first actuator port 144, second actuator port 145, first flow 111, second runner 161, the 3rd runner 119, the 4th runner 154, the 5th runner 122, the 6th runner 151, the 7th runner 152, the 8th runner 126, the 9th runner 123, the tenth runner the 153, the 11 runner 62, the first induced pressure hydraulic fluid port 7a, the first load-sensitive pressure signal hydraulic fluid port 6a.Valve body 101 has endoporus 104, and this endoporus 104 is equipped with valve core of main valve 103, and inlet cavity volume 112 links to each other with recuperation valve lower end cavity volume 110 by valve port 118, first flow 111.Recuperation valve lower end cavity volume 110 communicates with radial bore 120 through recuperation valve inner chamber 115, damping hole 167.The first load-sensitive chamber 16a links to each other with the first load-sensitive pressure signal hydraulic fluid port 6a by the 11 runner 62.Screw 160 is tightly connected with valve body 101 by first seal ring 148, and links to each other with recuperation valve spool top 117 by first spring 114.Second runner 161 links to each other with the 3rd runner 119, the 4th runner 154 by one-way valve 121.The first induced pressure hydraulic fluid port 7a is arranged on the 3rd runner 119.The 3rd runner 119 links to each other with the 6th runner 151 by valve core of main valve 103 openings, communicates with first actuator port 144 through the 5th runner 122 again.Five-way road 122 communicates with the 7th runner 152 through the opening of valve core of main valve 103, and finally links to each other with return opening 102; The 4th runner 154 communicates with the 8th runner 126 by the opening of valve core of main valve 103, links to each other with actuator port 145 through the 9th runner 123 again.The 9th runner 123 communicates with the tenth runner 153 through the opening of valve core of main valve 103, and finally links to each other with return opening 102.
As shown in Figure 2, the load-sensitive pressure signal selects valve block to comprise valve body 201, the first selector valves and second selector valve.Valve body 201 comprises endoporus 70a, endoporus 70b, filler opening 205, return opening 202, the 14 runner 38a, the 15 runner 38b, the 16 runner 63, the 17 runner 64, the 18 runner 41, the first oil back chamber 37a, the second oil back chamber 37b, the first meta drain tap 36a, the second meta drain tap 36b, the second annular groove 42a, the 3rd annular groove 42b, the second induced pressure hydraulic fluid port 7b, the 4th induced pressure hydraulic fluid port 27b, the second load-sensitive pressure signal hydraulic fluid port 6b, the 4th load-sensitive pressure signal hydraulic fluid port 28b.First selector valve comprises two position three way directional control valve spool 31a, nut 35a, nut 34a, expansion screw 33a, end seat 55a, the second spring 32a, spring seat 43a.Second selector valve comprises two position three way directional control valve spool 31b, nut 35b, nut 34b, expansion screw 33b, end seat 55b, the 3rd spring 32b, spring seat 43b.The second induced pressure hydraulic fluid port 7b links to each other with the second change-over valve core cavity of resorption 39b with the selector valve first filler opening 68a, the first change-over valve core epicoele 40a respectively by the 14 runner 38a; The 4th induced pressure hydraulic fluid port 27b links to each other with the first change-over valve core cavity of resorption 39a with the selector valve second filler opening 68b, the second change-over valve core epicoele 40b respectively by the 15 runner 38b.The second annular groove 42a of first selector valve links to each other with the second load-sensitive pressure signal hydraulic fluid port 6b by the 16 runner 63, and the 3rd annular groove 42b of second selector valve links to each other with the 4th load-sensitive pressure signal hydraulic fluid port 28b by the 17 runner 64.The second induced pressure hydraulic fluid port 7b links to each other with return opening 202 through the first oil back chamber 37a, the first meta drain tap 36a.The 4th induced pressure hydraulic fluid port 27b links to each other with return opening 202 through the second oil back chamber 37b, the second meta drain tap 36b.The selector valve second filler opening 69a links to each other by the 18 runner 41 with the selector valve second filler opening 69b, and the 18 runner 41 communicates with the responsive pressure signal hydraulic fluid port of first maximum load 30a simultaneously.The responsive pressure signal hydraulic fluid port of first maximum load 30a communicates with the 3rd load-sensitive chamber 16c of conventional load valve block by the responsive pressure signal hydraulic fluid port of second maximum load 30b, the responsive pressure signal hydraulic fluid port of the 3rd maximum load 30c of conventional load valve block, the 13 runner 66 of little load valve block.
As shown in Figure 3, little load valve block comprises valve body 301, valve core of main valve 303, first spring 314, one-way valve 321, recuperation valve spool 329, screw 360 and plug 346,347.Wherein, valve body 301 comprises endoporus 304, filler opening 305, return opening 302, first actuator port 344, second actuator port 345, first flow 311, second runner 361, the 3rd runner 319, the 4th runner 354, the 5th runner 322, the 6th runner 351, the 7th runner 352, the 8th runner 326, the 9th runner 323, the tenth runner the 353, the 12 runner 65, the 3rd load-sensitive pressure signal hydraulic fluid port 28a, the 3rd load pressure signal hydraulic fluid port 27a, the responsive pressure signal hydraulic fluid port of the 3rd maximum load 30b.Valve body 301 has endoporus 304, and this endoporus 304 is equipped with valve core of main valve 303, and inlet cavity volume 312 links to each other with recuperation valve lower end cavity volume 310 by valve port 318, first flow 311.Recuperation valve lower end cavity volume 310 communicates with radial bore 320 through recuperation valve inner chamber 315, damping hole 367.The second load-sensitive chamber 16b links to each other with the 3rd load-sensitive pressure signal hydraulic fluid port 28a by the 12 runner 65.Screw 360 is tightly connected with valve body 301 by first seal ring 348, and links to each other with recuperation valve spool top 317 by first spring 314.Second runner 361 links to each other with the 3rd runner 319, the 4th runner 354 by one-way valve 321.The 3rd induced pressure hydraulic fluid port 27a is arranged on the 4th runner 354.The 3rd runner 319 links to each other with the 6th runner 351 by valve core of main valve 303 openings, communicates with first actuator port 344 through the 5th runner 322 again.Five-way road 322 communicates with the 7th runner 352 through the opening of valve core of main valve 303, and finally links to each other with return opening 302; The 4th runner 354 communicates with the 8th runner 326 by the opening of valve core of main valve 303, links to each other with actuator port 345 through the 9th runner 323 again.The 9th runner 323 communicates with the tenth runner 353 through the opening of valve core of main valve 303, and finally links to each other with return opening 302.The responsive pressure signal hydraulic fluid port of second maximum load 30b is arranged on valve body 301.
As shown in Figure 4, the conventional load valve block comprises valve body 401, valve core of main valve 403, first spring 414, one-way valve 121, recuperation valve spool 429, screw 460 and plug 446,447.Wherein, valve body 401 comprises endoporus 404, filler opening 405, return opening 402, first actuator port 444, second actuator port 445, first flow 411, second runner 461, the 3rd runner 419, the 4th runner 454, the 5th runner 422, the 6th runner 451, the 7th runner 452, the 8th runner 426, the 9th runner 423, the tenth runner the 453, the 13 runner 66, the responsive pressure signal hydraulic fluid port of the 3rd maximum load 30c.Valve body 401 has endoporus 404, and this endoporus 404 is equipped with valve core of main valve 403, and inlet cavity volume 412 links to each other with recuperation valve lower end cavity volume 410 by valve port 418, first flow 411.Recuperation valve lower end cavity volume 410 communicates with radial bore 420 through recuperation valve inner chamber 415, damping hole 467.The 3rd load-sensitive chamber 16c links to each other with the responsive pressure signal hydraulic fluid port of the 3rd maximum load 30c by the 13 runner 66.Screw 460 is tightly connected with valve body 401 by first seal ring 448, and links to each other with recuperation valve spool top 417 by first spring 414.Second runner 461 links to each other with the 3rd runner 419, the 4th runner 454 by one-way valve 421.The 3rd runner 419 links to each other with the 6th runner 451 by valve core of main valve 403 openings, communicates with first actuator port 444 through the 5th runner 422 again.Five-way road 422 communicates with the 7th runner 452 through the opening of valve core of main valve 403, and finally links to each other with return opening 402; The 4th runner 454 communicates with the 8th runner 426 by the opening of valve core of main valve 403, links to each other with actuator port 445 through the 9th runner 423 again.The 9th runner 423 communicates with the tenth runner 453 through the opening of valve core of main valve 403, and finally links to each other with return opening 402.
For Fig. 1, no matter valve core of main valve 103 is in position, a left side or is in right position, hydraulic oil all enters inlet cavity volume 112 by filler opening 105, then enter first annular groove 113, first flow 111 and recuperation valve lower end cavity volume 110, second runner 161 successively after the throttling control by valve port 118, one-way valve 121 is again by the 3rd runner 119 or the 4th runner 154.We are not difficult to find that the pressure of the first induced pressure hydraulic fluid port 7a is always the induced pressure of heavy load valve block.In like manner, we are not difficult to find that the pressure of the 3rd load pressure signal hydraulic fluid port 27a also is always the induced pressure of little load valve block in Fig. 3.
Because every induced pressure scope of split ratio load sensing multi-way valve is predictable, we suppose that the heavy load valve block is that heavy load connection, little load valve block are little load connection, in order to realize the purpose of this utility model, increase the load-sensitive pressure signal again between heavy load connection and heavy load connection and select valve block, the load-sensitive pressure signal selects valve block to be mainly used in the whether needs increase of restriction pressure reduction that difference according to the pressure maximum of heavy load valve block and the pressure minimum of little load valve block decides little load valve block.
The induced pressure of note heavy load valve block is PL1, the induced pressure of little load valve block is PL2, each change-over valve core upper end lifting surface area is A, and the load-sensitive pressure signal selects second spring 32a of valve block and the spring force of the 3rd spring 32b to be Fs, and the weight of each change-over valve core is G.Wherein the value of (G+Fs)/A should be greater than the difference of maximum load pressure and minimum load pressure, to guarantee that reaching final pressure and flow at multi-way valve respectively joins the realization of flow by the valve rod travel pro rate when saturated.In the heavy load valve block, the pressure of the first induced pressure hydraulic fluid port 7a is PL1; In little load valve block, the pressure of the 3rd induced pressure hydraulic fluid port 27a is PL2, then select in the valve block at the load-sensitive pressure signal, the pressure of the second induced pressure hydraulic fluid port 7b is PL1, the pressure of the 4th induced pressure hydraulic fluid port 27b is PL2, the pressure oil of the second induced pressure hydraulic fluid port 7b enters the spool epicoele 40a of first selector valve and the spool cavity of resorption 39b of second selector valve simultaneously, and the pressure oil of the 4th induced pressure hydraulic fluid port 27b enters the spool cavity of resorption 39a of first selector valve and the spool epicoele 40b of second selector valve simultaneously.
Suppose 1:PL1＞PL2, PL1-PL2＜(G+Fs)/A, because the difference of maximum load pressure and minimum load pressure is less than setting value (G+Fs)/A, the restriction pressure reduction that this moment, little load joined need not increase.Select in the valve block at the load-sensitive pressure signal, for first selector valve, because PL1+ (G+Fs)/A＞PL2, two position three way directional control valve spool 31a is in the next, and the second load-sensitive pressure signal hydraulic fluid port 6b communicates with the 18 runner 41; For second selector valve, because PL1＜PL2+ (G+Fs)/A, two position three way directional control valve spool 31b also is in the next, and the 4th load-sensitive pressure signal hydraulic fluid port 28b also communicates with the 18 runner 41.This moment, the second load-sensitive pressure signal hydraulic fluid port 6b communicated by the 18 runner 41 with the 4th load-sensitive pressure signal hydraulic fluid port 28b.Again because the first load-sensitive pressure hydraulic fluid port 6a of heavy load valve block selects the second load-sensitive pressure hydraulic fluid port 6b of valve block to communicate with the load-sensitive pressure signal, the 3rd load-sensitive pressure hydraulic fluid port 28a of little load valve block communicates with the 4th load-sensitive pressure hydraulic fluid port 28b of heavy load valve block, at this moment, the first load-sensitive chamber 16a of heavy load valve block communicates with the second load-sensitive chamber 16b of little load valve block, because the selection of the responsive pressure signal of the maximum load of recuperation valve, will be full of the pressure oil liquid of the responsive pressure of maximum load among the first load-sensitive chamber 16a and the second load-sensitive chamber 16b.
Suppose 2:PL1＞PL2, PL1-PL2＞(G+Fs)/A, because the difference of maximum load pressure and minimum load pressure is greater than setting value (G+Fs)/A, this moment, the restriction pressure reduction of little load connection needed increase.Select in the valve block at the load-sensitive pressure signal, for first selector valve, because PL1+ (G+Fs)/A＞PL2, two position three way directional control valve spool 31a is in the next, and the second load-sensitive pressure signal hydraulic fluid port 6b communicates with the 18 runner 41; For second selector valve, because PL1＞PL2+ (G+Fs)/A, two position three way directional control valve spool 31b is in upper, and the 4th load-sensitive pressure hydraulic fluid port 28b no longer communicates with the 18 runner 41, but communicates with the 4th load pressure signal 27b of self by the 15 runner 38b.At this moment, the load-sensitive pressure signal of heavy load valve block is the load pressure signal of self, and the load-sensitive pressure signal of little valve block also is the load pressure signal of self.At this moment, the restriction pressure reduction of little load valve block is no longer consistent with the restriction pressure reduction of heavy load valve block, but than the restriction pressure reduction of heavy load valve block big a difference, this difference just is the difference PL1-PL2 of maximum load pressure and minimum load pressure.
From above hypothesis, can know, pressure is always the responsive pressure signal of maximum load in the 6th road logical 41, and the responsive pressure signal of this maximum load can be supplied with the 3rd load-sensitive chamber 16c. of conventional load valve block by the responsive pressure signal hydraulic fluid port of first maximum load 30a, the responsive pressure signal hydraulic fluid port of second maximum load 30b, the responsive pressure signal hydraulic fluid port of the 3rd maximum load 30c
When the multi-way valve spool was in meta, the second induced pressure hydraulic fluid port 7b and the 4th induced pressure hydraulic fluid port 27b were respectively by the second drain tap 36b drain charge among the first drain tap 36a, the second oil back chamber 37b among the first oil back chamber 37a.
According to the utility model schematic diagram 4, heavy load valve block, load-sensitive pressure signal select the concrete derivation pass of valve block, little load valve block and conventional load valve block to be:
Suppose 1:PL1＞PL3＞PL2, the s/A of PL1-PL2＜(G+Fs)
Leading to valve, second this moment first, to lead to valve all upper logical, and PLmax=PL1
For recuperation valve 1:PM1=PLmax
For recuperation valve 2:PM2=PLmax
For recuperation valve 3:PM3=PLmax
Release: PM1=PM2=PM3
Control valve 1 pressure reduction: Δ P1=P0-PM1=P0-PLmax
Control valve 2 pressure reduction: Δ P2=P0-PM2=P0-PLmax
Control valve 3 pressure reduction: Δ P3=P0-PM3=P0-PLmax
Release: Δ P1=Δ P2=Δ P3
Recuperation valve 1 pressure reduction: Δ P=PM1-PL1=0
Recuperation valve 2 pressure reduction: Δ P=PM2-PL2=PL1-PL2
Recuperation valve 3 pressure reduction: Δ P=PM3-PL3=PL1-PL3
As can be known: recuperation valve 2 and recuperation valve 3 are realized pressure compensation
Suppose 2:PL1＞PL3＞PL2, PL1-PL2＞(G+Fs)/A
It is upper logical to lead to valve this moment first, and second selector valve is the next logical, and PLmax=PL1
For recuperation valve 1:PM1=PLmax
For recuperation valve 2:PM2=PL2
For recuperation valve 3:PM3=PLmax
Release: PM1=PM3=PLmax, PM2=PL2
Control valve 1 pressure reduction: Δ P1=P0-PM1=P0-PLmax
Control valve 2 pressure reduction: Δ P2=P0-PM2=P0-PL2
＝P0-PL2＝P0-PL1+PL1-PL2
＝P0-PLmax+(PL1-PL2)
As can be known: increase (PL1-PL2) at control valve place pressure reduction, realize pressure compensation simultaneously
Control valve 3 pressure reduction: Δ P3=P0-PM3=P0-PLmax
Recuperation valve 1 pressure reduction: Δ P=PM1-PL1=0
Recuperation valve 2 pressure reduction: Δ P=PM2-PL2=0
Recuperation valve 3 pressure reduction: Δ P=PM3-PL3=PL1-PL3
When multi-way valve reaches final pressure, because (G+Fs)/value of A is all the time greater than the difference of maximum load pressure and minimum load pressure, guaranteed that two selector valves in the load-sensitive pressure signal selection valve block are in the next all the time, the heavy load valve block directly links to each other with the load-sensitive chamber of little load valve block, this has also just kept consistent with classical split ratio load sensing multi-way valve, when flow is saturated, the flow rate distribution that each valve block is in proportion according to the stroke of valve rod is to guarantee the harmony of each loaded work piece.
Claims (6)
1. one kind has the little load split ratio load sensing multi-way valve of compensation automatically, it is characterized in that it mainly selects valve block, little load valve block and conventional load valve block to be connected to form successively by heavy load valve block, load-sensitive pressure signal.
2. according to the described split ratio load sensing multi-way valve of claim 1 with the automatic compensation of little load, it is characterized in that described heavy load valve block, little load valve block and conventional load valve block include valve body, valve core of main valve, spring, one-way valve, recuperation valve spool, screw, seal ring and two plugs; Wherein, valve body comprises endoporus, filler opening, return opening, actuator port, first flow, second runner, the 3rd runner, the 4th runner, the 5th runner, the 6th runner, the 7th runner, the 8th runner, the 9th runner, the tenth runner; Recuperation valve inner chamber, damping hole and radial bore are arranged in the recuperation valve spool; Valve body has endoporus, and this endoporus is equipped with valve core of main valve, and the inlet cavity volume links to each other with recuperation valve lower end cavity volume by valve port, first flow; Recuperation valve lower end cavity volume communicates with radial bore through recuperation valve inner chamber, damping hole; Screw is connected with valve seal by seal ring, and links to each other with recuperation valve spool top by spring; Second runner links to each other with the 3rd runner, the 4th runner by one-way valve; The 3rd runner links to each other with the 6th runner by the valve core of main valve opening, communicates with actuator port through the 5th runner again; The five-way road communicates with the 7th runner through the opening of valve core of main valve, and finally links to each other with return opening; The 4th runner communicates with the 8th runner by the opening of valve core of main valve, links to each other with actuator port through the 9th runner again; The 9th runner communicates with the tenth runner through the opening of valve core of main valve, and finally links to each other with return opening.
3. according to the described split ratio load sensing multi-way valve of claim 2, it is characterized in that described heavy load valve block also comprises the first load-sensitive pressure signal hydraulic fluid port, the 11 runner and the first induced pressure hydraulic fluid port with the automatic compensation of little load; The described first load-sensitive pressure signal hydraulic fluid port links to each other with the first load-sensitive chamber by the 11 runner, and the 3rd runner, the 4th runner all communicate with the first induced pressure hydraulic fluid port.
4. according to the described split ratio load sensing multi-way valve of claim 2, it is characterized in that described little load valve block also comprises the responsive pressure signal hydraulic fluid port of the second load-sensitive pressure signal hydraulic fluid port, the 12 runner and second maximum load with the automatic compensation of little load; The described second load-sensitive pressure signal hydraulic fluid port links to each other with the second load-sensitive chamber by the 12 runner; The responsive pressure signal hydraulic fluid port of second maximum load is arranged on valve body.
5. according to the described split ratio load sensing multi-way valve of claim 2, it is characterized in that described conventional load valve block also comprises responsive pressure signal hydraulic fluid port of the 3rd maximum load and the 13 runner with the automatic compensation of little load; The responsive pressure signal hydraulic fluid port of described the 3rd maximum load communicates with the 3rd load-sensitive chamber by the 13 runner.
6. according to the described split ratio load sensing multi-way valve of claim 1, it is characterized in that described load-sensitive pressure signal selects valve block to comprise valve body, first selector valve and second selector valve with the automatic compensation of little load; Valve body comprises endoporus, filler opening, return opening, the 14 runner, the 15 runner, the 16 runner, the 17 runner, the 18 runner, first oil back chamber, second oil back chamber, the first meta drain tap, the second meta drain tap, second annular groove, the 3rd annular groove, the second induced pressure hydraulic fluid port, the 4th induced pressure hydraulic fluid port, selector valve first filler opening, selector valve second filler opening, the responsive pressure signal hydraulic fluid port of first maximum load, the second load-sensitive pressure signal hydraulic fluid port, the 4th load-sensitive pressure signal hydraulic fluid port; First selector valve, second selector valve include two position three way directional control valve spool, nut, nut, expansion screw, end seat, the 3rd spring, spring seat; Second load pressure signal communicates with first load pressure signal of heavy load valve block; The second induced pressure hydraulic fluid port links to each other with selector valve first filler opening, the first change-over valve core epicoele and the second change-over valve core cavity of resorption of first selector valve respectively by the 14 runner; The 4th induced pressure hydraulic fluid port communicates with the 3rd induced pressure hydraulic fluid port of little load valve block; The 4th induced pressure hydraulic fluid port links to each other with selector valve second filler opening, the second change-over valve core epicoele and the first change-over valve core cavity of resorption of second selector valve respectively by the 15 runner; Second annular groove of first selector valve links to each other with the second load-sensitive pressure signal hydraulic fluid port by the 16 runner, and the 3rd annular groove of second selector valve links to each other with the 4th load-sensitive pressure signal hydraulic fluid port by the 17 runner; The second induced pressure hydraulic fluid port links to each other with return opening through first oil back chamber, the first meta drain tap; The 4th induced pressure hydraulic fluid port links to each other with return opening through second oil back chamber, the second meta drain tap; Selector valve second filler opening of first selector valve links to each other by the 18 runner with selector valve second filler opening of second selector valve, and the 18 runner communicates with the responsive pressure signal hydraulic fluid port of first maximum load simultaneously; The responsive pressure signal hydraulic fluid port of first maximum load communicates with the 3rd load-sensitive chamber of conventional load valve block by the responsive pressure signal hydraulic fluid port of the 3rd maximum load, the 13 runner of the responsive pressure signal hydraulic fluid port of second maximum load of little load valve block, conventional load valve block.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920198727XU CN201547043U (en) | 2009-10-22 | 2009-10-22 | Split ratio load sensitive multi-way valve having small load and self compensation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920198727XU CN201547043U (en) | 2009-10-22 | 2009-10-22 | Split ratio load sensitive multi-way valve having small load and self compensation |
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| Publication Number | Publication Date |
|---|---|
| CN201547043U true CN201547043U (en) | 2010-08-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920198727XU Expired - Fee Related CN201547043U (en) | 2009-10-22 | 2009-10-22 | Split ratio load sensitive multi-way valve having small load and self compensation |
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| Country | Link |
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| CN (1) | CN201547043U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108150475A (en) * | 2018-02-05 | 2018-06-12 | 江苏恒立液压科技有限公司 | Load sensing multi-way valve group and with its walking machine hydraulic system |
-
2009
- 2009-10-22 CN CN200920198727XU patent/CN201547043U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108150475A (en) * | 2018-02-05 | 2018-06-12 | 江苏恒立液压科技有限公司 | Load sensing multi-way valve group and with its walking machine hydraulic system |
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Granted publication date: 20100811 Termination date: 20111022 |