CN1902404A

CN1902404A - Flow valve and flow distributor comprising several flow valves

Info

Publication number: CN1902404A
Application number: CNA2004800399730A
Authority: CN
Inventors: 卡尔·克鲁格-卡修斯
Original assignee: Bosch Rexroth AG
Current assignee: Bosch Rexroth AG
Priority date: 2004-01-07
Filing date: 2004-12-29
Publication date: 2007-01-24
Anticipated expiration: 2024-12-29
Also published as: DE102004010374A1; CN100504079C

Abstract

Disclosed are a flow valve and a flow distributor for supplying a pressure medium to several users. Each flow valve comprises a measuring diaphragm and a pressure regulator. A pressure regulator piston of the pressure regulator comprises two control edges, whereby one is active when adding up the pressure medium flows and the other is active when separating a pressure medium flow. The flow valve also has at least one LS-control edge which can be used to control one LS cross-section when the pressure regulator is opened, enabling pressure corresponding to the load pressure to be indicated in a load monitoring line.

Description

Flow valve and flow distributor with a plurality of Flow valves

Technical field

The present invention relates to be used for the Flow valve of flow distributor, preamble according to claim 1, flow distributor is used for the invention still further relates to the flow distributor that comprises this kind Flow valve for some hydraulic consumers (hydraulic consumer) provide pressure liquid.

Background technique

The liquid stream that the hydraulic flow distributor is guaranteed setting pressure is according to the component (partialquantities) of expectation some hydraulic consumer or hydraulic load that are arranged in parallel mutually and are independent of induced pressure of flowing through.If each that adopts flow distributor independently Flow valve is positioned at the mode guide pressure liquid stream of the upstream of hydraulic consumer, be referred to as liquid flow distribution (dividing) serviceability.But, if each independently Flow valve be positioned at the downstream of hydraulic consumer, then be referred to as liquid stream savings (accumulating) serviceability.

Each Flow valve of flow distributor all has a metering orifice and a pressure regulator, and this pressure regulator is set at the downstream of metering orifice when liquid flow distribution serviceability.When liquid flow distribution serviceability, each pressure regulator bears maximum load pressure and limits its corresponding metering orifice forcefully and the stream of the liquid between the load at closing direction, this restriction is very strong, causes pressure after all metering orifices to equal or slightly greater than maximum load pressure.This arrangement and force applications for pressure regulator, flow distributor is similar to so-called load independence assignment of traffic (LUDV, load-pressure independent flow distribution,) control system, for example, WO 95/32364 discloses a kind of special case of load sensor control system.In this control system, maximum load pressure is indicated to variable displacement pump, and this variable displacement pump is controlled, make the leading pump pressure in the pump piping be higher than induced pressure by predetermined pressure difference Aep.In the LUVD control system, even when pump pressure descends, also keep the liquid flow distribution that each independent parts liquid is flowed.Because under this so-called under-supply situation, the pressure in metering orifice downstream is without any change.The front of all metering orifices all is applied in the pump pressure after the decline, and the pressure reduction that is positioned at all metering orifices is all changed by same way as.

No matter use variable displacement pump or metering pump as pressure liquid supply source, no matter also how variable displacement pump is conditioned, can the use traffic distributor.When using in stroke driving device, discharge capacity is adjusted, for example, regulates discharge capacity by operating handle or pedal, and flow distributor will be pro rata distributed discharge capacity to the hydraulic pressure consumer according to the volume ratio of expectation.

The control system of WO 95/32364 can not be carried out " savings of pressure liquid component ".Because, must guarantee between the closing direction upward pressure regulator of pressure regulator and hydraulic consumer it no longer is that pressure maximum but pressure minimum are taken as the leading factor in liquid when savings stream, here, the leading pressure at maximum load hydraulic consumer place is minimum pressure.

The flow distributor that is used for liquid flow distribution and liquid stream savings is open at DE 195 31 497 A1.In this control structure, the pressure regulator of distributing to hydraulic consumer is pushed up open position by the aligning spring, it is applied in maximum load pressure in " liquid flow distribution " serviceability, it is applied in corresponding minimum useful load pressure by pilot valve and in " liquid stream savings " serviceability, like this in these two kinds of serviceability, the pressure loss on the metering orifice can be kept constant, and irrelevant with induced pressure.

The defective of above-mentioned prior art scheme is, must the respective operations state be controlled by pilot valve, and needs to use expensive device that maximum and/or minimum load pressure are discharged (tap off).

Summary of the invention

The object of the present invention is to provide a kind of Flow valve and plant the flow distributor that Flow valve constitutes thus, it can realize " liquid flow distribution " and " liquid stream savings " serviceability with the cost of minimum.

Above-mentioned purpose is to realize by the flow distributor of the Flow valve of claim 1 characteristic and claim 13 characteristic.

The Flow valve that is assigned to corresponding hydraulic consumer according to the present invention comprises metering orifice and pressure regulator, and this pressure regulator is regulated maximum or minimum load pressure in a side of metering orifice.According to the present invention, the pressure regulating piston of pressure regulator is designed to have the structure at two control edges, and one of them control edge is assigned to " liquid stream savings " serviceability, and another control edge is assigned to " liquid flow distribution " serviceability.This Flow valve also comprises LS control edge, can be opened fully so that control the LS cross section during indication load in the LS pipeline at pressure regulator by this control edge and open.When opened in control LS cross section, pressure can be discharged from the pressurised fluid stream road between metering orifice and the pressure regulator inlet.When this pressure is at first opened fully corresponding to pressure regulator at the leading induced pressure at the hydraulic consumer place that is assigned with.This situation occurs in " liquid flow distribution " serviceability of hydraulic consumer guiding maximum load pressure, this is to open fully because distribute to the pressure regulator of the Flow valve of this hydraulic consumer, and the pressure regulator of distributing to other Flow valves of the hydraulic consumer that hangs down load is switched to the control position, so that the initial pressure of metering orifice downstream part is limited in the low induced pressure of these hydraulic consumers.

In " liquid stream savings " serviceability, a.m. the pressure with the minimum load hydraulic consumer is corresponding basically for the pressure in the pressurised fluid stream passage, the pressurised fluid stream of minimum flow is to pressure regulator during the control beginning, and the latter is opened or stays open state, and the pressure in the pressurised fluid stream passage is subjected to the restriction of the pressure regulator of other high capacity consumers, and the power on the pressure regulator piston reaches balance.

According to the present invention, can conversion automatically between " liquid flow distribution " and " liquid stream savings " two kinds of operations, this conversion is by discharging realization at the corresponding maximum load pressure (" liquid flow distribution ") in the pressurised fluid stream passage between the pressure regulator of opening and the metering orifice and the pressure of corresponding minimum load pressure (" accumulation of liquid stream ") respectively.In higher load and Flow valve than the hydraulic consumer that hangs down load, controlling the LS cross section respectively closes, make the chain of command of related pressure regulator be applied in and the corresponding pressure of maximum load pressure (" liquid flow distribution "), and direction is applied in and the corresponding pressure of minimum load pressure (" liquid stream savings ") opening at closing direction.

In an optimal technical scheme, the pressure regulator of Flow valve is opened in the home position.

Can control the LS cross section by 2/2 mouthful of position control valve, this control valve has two LS control edges, and one of them is used for " liquid flow distribution ", and another is used for " liquid stream savings ".

In the specific change example of a compact structure of the present invention, this position control valve is incorporated in the pressure regulator piston, this piston is the internal piston of position control valve, it is directed in the pilot hole of pressure regulator piston and this internal piston comprises control ring, forms two aforesaid LS control edges on two annular end faces of this control ring.

By the LS pressure that applies pump pressure to an end face and apply the LS pipeline to another end face this internal piston (conversion of position control valve) is started.When " liquid flow distribution ", this internal piston is switched to first switching position by high pump pressure, and when " liquid stream savings ", the effect that this internal piston is subjected to low pump pressure is switched to another switching position.In above-mentioned two kinds of positions, above-mentioned LS controls the effect that the LS cross section is opened in control of playing at edge.

In technique scheme, be preferably the LS pipeline and be communicated with the LS spring chamber of pressure regulator, open the LS cross section by control, make between spring chamber and the passage that is used for guiding the pressure corresponding to be communicated with induced pressure.

In a preferred variant of the present invention, pressure regulator also comprises another spring chamber, and this spring chamber is communicated with the LS spring chamber via the communication passage of prolonging the extension of internal piston periphery.

Better the Flow valve structure is to stretch out the LS spring chamber and form guide ring in the described pressure regulator end of being drawn when internal piston, and this guide ring is directed in the pressure chamber of the thread plug of Flow valve.In this pressure chamber, be block of internal piston formation, and apply pump pressure to this internal piston.

For channeling conduct better, internal piston can comprise a radial ring (radial collar), and this radial ring is adjacent along the interior circumferential portion in pressure regulator piston guide hole.All be formed with vertical recess in the periphery of radial ring and control ring and the interior perimeter surface of pilot hole, pressurised fluid stream can be flowed between two spring chambers.

The pressure regulator piston preferably is designed to have the structure of a central control flume on the end face that forms two control edges.The pressure regulator piston is headed into its open middle position by two aligning springs.

The pressure regulator piston comprises one or more radial holes, so that the pressure between the pressurised fluid stream passage between pressure regulator and the metering orifice is discharged.

Preferably first Flow valve all comprises a force feed valve, can not transship by this force feed valve protection hydraulic consumer by the outside, and if take place to fill when not enough can injection pressure liquid, to avoid that cavity takes place and to make system keep sealing.

Other advantage of the present invention embodies at dependent claims.

Description of drawings

Below with preferred embodiment of the present invention and conjunction with figs. describe in detail as after.

Fig. 1 is the functional diagram that is in the flow distributor of " liquid flow distribution " serviceability.

Fig. 2 is the sectional view of Flow valve shown in Figure 1.

Fig. 3 is the detail drawing of the pressure regulator of Flow valve shown in Figure 2.

Fig. 4 is the different operating position of internal piston when " liquid flow distribution " of pressure regulator shown in Figure 3.

The Flow valve of low load hydraulic consumer when Fig. 5 is " liquid flow distribution ".

Fig. 6 is the functional diagram according to the flow distributor that is in " liquid stream savings " serviceability of Fig. 1.

The position of internal piston shown in Figure 4 when Fig. 7 is " liquid stream savings ".

Fig. 8 is the sectional view of the Flow valve of low load hydraulic consumer.

Fig. 9 is the loop graphical diagram of Flow valve of the present invention.

1 flow distributor, 2 variable displacement pumps

4,6,8,10 oil hydraulic motors, 12,14,16,18 Flow valves

20 seat ring 22LS pipelines

24 metering orifices, 26 pressure regulators

28 force feed valves, 30 pumps

32 feeding passages, 34 feed lines

36 supply lines 38 advance pipeline

40 reflux pipelines, 43 pressure regulator pistons

44,46 thread plugs, 50,52 aligning springs

54,56 annular cavitys, 57 annular table

58 metering orifice perforates, 60 screws

62 jiaos of hole 64 chambers

66 ramp ways, 68 annular passs

70 pressure chamber, 72 communication passage

74,76 latch plates are 78,80

81 control flumes, 82 liquid flow distribution control edge

84 liquid stream savings control edge, 86 spring chambers

88LS spring chamber 90 passages

92 pilot holes, 94 internal pistons

96 guide rings, 98 radial holes

100 control rings, 102 radial ring

104,106 vertical recesses 105 extension part radially

108,110LS control 112LS cross section, edge

114 are fixed on the control edge of control edge 116 spring chambers, one side on the shell

Embodiment

The present invention is mainly used in the mechanical device of the hydrostatic drive with sealing or open oil hydraulic circuit, and is mainly used in rotating driving device, for example winch driving, belt drives or row step drive unit.

Figure 1 shows that the functional diagram of the flow distributor of the row step driving that is used for the mobile working device.Control structure partly is the loop of a sealing and has a variable displacement pump 2.This row step drive unit has 4 oil

hydraulic motors

4,6,8,10 that pressure liquid is provided by variable displacement pump 2.

Among the embodiment shown in the figure, by

Flow valve

12,14,16, the 18 dispense pressure liquid of distributing to

consumer

4,6,8,10

respectively.Flow valve

12,14,16,18 is formed a controlling component.

As shown in the figure, be example with Flow valve 12, it comprises seat ring 20, is formed with pressure terminal P, feeding terminal S, operational terminal A (B, C, D) and LS terminal LS on this seat ring 20.Each induced pressure terminal LS of control structure 1 interconnects by LS pipeline 22.Variable metering orifice 24, pressure regulator 26 and force feed valve 28 are provided in the seat ring 20.Pressure regulator 26 flows to the downstream that consumer 4 mobile directions are set at metering orifice 24 by liquid.As mentioned above, the pressure regulator 26 that is independent of induced pressure falls the pressure of variable metering orifice 24 tops to keep constant, and the volume that flows through the pressure liquid of metering orifice 24 so only depends on the perforate cross section of metering orifice 24 self.

The leading pressure that operational terminal A (B, C, D) is located by the force feed valve is limited in maximum value, can protect consumer 4 (6,8,10) can not transship like this.And, when sending out, fill when not enough, when for example descending drives, or when tractive load, can be by feeding terminal S, and if suitable by pump 30 by force feed valve 28 with the filled again pressure liquid of existing method.In this case, pressure liquid is by latter's sucking-off and be admitted to the feeding terminal S of

Flow valve

12,14,16,18 correspondences by feeding passage 34 in groove T.

The pressure terminal P of variable displacement pump 2 is connected with the pressure terminal P of valve by branch's pressure or inlet passage.Operational terminal A, the B of

Flow valve

12,14,16,18 correspondences, C, D are connected with the pressure terminal of

consumer

4,6,8,10 by advancing

pipeline

38,40,42,44.Pressure liquid is flow to the suction terminal R of variable displacement pump 2 via shared current return circuit 40 by consumer.At Fig. 2 with 12 magnifying show of the Flow valve among Fig. 1.The structure of

other Flow valves

14,16,18 is identical with it.

As shown in Figure 2, pressure regulator perforate 42 penetrates valve disc 20 in the horizontal direction, and this perforate is sealed by

thread plug

44,46 respectively at two end faces.In pressure was regulated perforate 42, the pressure regulator piston 43 that is headed into the middle part by

central spring

50,52 can move axially being directed.The pressure regulator perforate extends to form two

annular cavitys

54,56 at the middle part, clamping one annular table 57 between the annular cavity 54,56.Annular cavity 56 is connected with operational terminal A, and in Fig. 2, metering orifice perforate 58 vertical extent also are communicated with annular cavity 54, and metering orifice 24 is inserted in the described metering orifice perforate.Its concrete structure design is demonstrated in Another Application, and this structural design is not emphasis of the present invention place.Suppose that just metering orifice 24 has variable cross section.But the present invention is not subjected to the restriction of this kind structural design.

In embodiment illustrated in fig. 2, be communicated with metering orifice perforate 58 with respect to the vertically extending pressure terminal of projection plane P.The bottom of metering orifice perforate 58 is by screw 60 sealings (being seen by Fig. 2).

In annular cavity 56, also be provided with an oblique angle perforate 62, an end of this oblique angle perforate 62 enters horizontally extending arm, and the force feed valve with cylinder structure is threaded onto on this arm.Feeding terminal S feeds chamber 64, and this chamber 64 constitutes the radially extension of metering orifice perforate 58 by a path perpendicular to the extension of Fig. 2 projection plane.

Pressure terminal P is connected with annular channels 68 by inclined path 66, and annular channels 68 surrounds the periphery of thread plug 46.In thread plug 46, form and pressure regulator perforate 42 axially extending pressure chamber 70, this pressure chamber 70 is connected with annular channels 68 by connecting path 72, and like this, the pressure at pressure terminal P place always accounts for leading in pressure chamber 70, that is to say, always applying pump pressure.

The structure of pressure regulator is described below by the view Fig. 3 that amplifies.

Correspondingly, the

central spring

50,52 of pressure regulator piston 43 is divided to be supported on

contiguous thread plug

46 and 44, and

central spring

50,52 acts on the pressure regulator piston 43 by cup-shaped latch plate 74,76, and in effect, the bearing 78,80 that central authorities'

spring

50,52 partly submerges and is arranged in pressure regulator piston 43 end faces, thus pressure regulator length in the axial direction shortened.

All sides in the central region of pressure regulator piston 43 are provided with circumferential control flume 81, the annular end face of this circumferential control flume 81 form two with annular table 57 interactional control edges.Hereinafter, the control edge in left side is called as " liquid flow distribution " control edge 82 among Fig. 3, should " liquid flow distribution " control edge 82 work carrying out " liquid flow distribution " time, the control edge on right side is called " liquid stream savings " control edge 84 among Fig. 3, should " liquid stream savings " control edge 84 works carrying out " liquid stream savings " time.Among Fig. 2, two

control edges

82,84 are in the home position, stand away with annular table 57, like this, from operational terminal A (B, C, D) to the metering orifice perforate 58 and be unobstructed to the connection of the pressure liquid of pressure terminal P.

Central authorities' spring 52 is arranged in the spring housing 86, regulator piston 43 and thread plug 44 restrictions that are under pressure of the end face of spring housing 86.The other end of pressure regulator piston 43 and thread plug 46 define 88, the one load indicating terminal LS of a LS spring housing jointly by being communicated with LS spring housing 88 with respect to the vertically extending path of projection plane.Correspondingly, pressure is all identical in the LS spring housing 88 of all

Flow valves

12,14,16,18, roughly is equivalent to the maximum load pressure of consumer when " liquid flow distribution ", and roughly is equivalent to the minimum load pressure of consumer when " liquid stream savings ".

Referring to Fig. 3, the internal piston 94 in the pilot hole 92 is directed, and can move axially and pass vertically pressure regulator piston 43.LS spring chamber 88 is passed in this internal piston left part, and has guide ring 96 there, is used for guiding this internal piston sealedly in the pressure chamber 70 of thread plug 46.

The other end extends in the spring chamber 86, is supported by thread plug 44 in its bared end position.When internal piston 94 was moved to the left, its left part was near the bottom of pressure chamber 70, and the position at its two ends is limited owing to abutting against on corresponding

thread plug

44 or 46 like this.

Control flume 81 is to form a radial hole 98 at least in the pressure regulator piston 43 on the position on a left side, and this radial hole 98 feeds pilot hole 92 on the one hand, feeds annular cavity 54 on the other hand.In the zone of described radial hole 98, on internal piston 94, form the control ring 100 of a radial projection.Internal piston 94 segment distance to the right provides a radial ring 102, and internal piston 94 obtains guiding via this radial ring 102 in pilot hole 92.Pressure regulator piston 43 has less diameter and is forming an annular cavity with the interior perimeter surface of pilot hole 92 with ring 100,102 adjacent positions.As shown in Figure 3, control ring 100 and and radial ring 102 on have vertical recess 104,106, make control oil can be between

spring chamber

86,88 along described annulus and vertically recess 104,106 flow.With the right side, pilot hole 92 radially stretches into radially extension part 105 at radial hole 98, circularizes the gap along the peripheral shape of control ring 100.

On the annular end face of control ring 100, form LS control edge 108,110, control edge 110 acts on the Flow valve of maximum load pressure consumer when " liquid flow distribution ", and the LS control edge 108 of distributing to the Flow valve of minimum load pressure consumer worked in " liquid stream savings " time.

About to the further describing of function, suppose that at first control structure 1 works under the serviceability of " liquid flow distribution ".Consult Fig. 1, the induced pressure of consumer 4 will reach 400 crust, the induced pressure of consumer 6 will reach 600 crust, the induced pressure of consumer 8 will reach 200 crust, the induced pressure of consumer 10 will reach 100 crust, correspondingly provide pumps when " 10 crust metering spring " () of 410 crust that pump pressure is increased to 410 crust by rotation.Described pump pressure (410 crust) is applied in the pressure chamber 70 equally by passage 66, make this pump pressure of left side load of internal piston, and lower pressure acts on the right side of internal piston, below this lower pressure is called the leading pressure in the pressure chamber 54.Among the embodiment shown in the figure, pressure decline 10 crust on the metering orifice 24 of Flow valve 12, the pressure drop on the pressure regulator 26 can be ignored at medium position.The leading pressure of metering orifice 24 outlets acts on the right side of internal piston 43.This pressure in the open position of pressure regulator 26 corresponding to maximum load pressure, i.e. the leading pressure of operational terminal A.Because the existence of pressure difference (pump pressure deducts maximum load pressure), internal piston 94 is moved right, and enters in the piston shown in Figure 3, and the right part of internal piston 94 is near thread plug 44 in this piston.In this position, the LS cross section is opened at the LS of control ring 100 control edge 110, and radial hole 98 is connected with spring chamber 88 by this cross section, and the leading pressure in the annular cavity 54 also is applied to spring chamber 88 like this.That is to say that the pressure (maximum load pressure) of these 400 crust also is instructed to in the pressure chamber 88 of other Flow valves via LS pipeline 22.The internal piston 94 of distributing to other pressure regulators 26 of low load consumption device is entered end position shown in Figure 3 similarly by high pump pressure by moving right.

For the ease of understanding, figure 4 illustrates 110 zones, control edge and contiguous pressure regulator piston 43 zones of internal piston 94.Fig. 4 b) be the load indicating positions of the pressure regulator 26 of aforesaid maximum load consumer 4, maximum load pressure wherein (400 crust) is indicated in the LS pipeline 22.As previously mentioned, right end position at the central position and the internal piston 94 of pressure regulator piston 43, open so that carry out the load indication in the 110 control LS cross sections 112, control edge of control ring 100, being applied in corresponding induced pressure in the spring chamber 88 like this, more exactly is exactly the outer leading pressure of outlet of metering orifice 24.This pressure comprises that via aforesaid annular space radially extension part 105 also is indicated in the spring chamber 86 on the right with vertical recess 106, like this pressure regulator piston 43 of Flow valve 12 at end face by pressure compensation and keep its medium position, therefore the pressure regulator 26 of maximum load pressure consumer is opened fully, and it is long-pending mobile not limit pressured fluid.

Fig. 5 has exemplarily showed the control position that the Flow valve 14,16,18 of the low load consumption device 6,8,10 that connects with corresponding operational terminal B, C, D will adopt.As mentioned before, with regard to the Flow valve 14,16,18 of low load consumption device, the right-hand member of internal piston 94 also adjoins thread plug 44.Like this, the signal of the pressure regulator 26 of Flow valve 12 is indicated in the spring chamber 88 of Flow valve 14,16,18, and the maximum load pressure of 400 crust is applied in the spring chamber 88 equally.At the control initial stage, during the liquid flow point is fitted on low load consumption device, the initial consumer that flows to of pressure liquid with minimum fluid resistance.Then, the pressure regulator piston 43 of Flow valve 14,16,18 is owing to be subjected to the pressure that the effect of the maximum load pressure in the LS spring chamber 88 begins to head on aligning spring 52 and moved right by middle position, and, edge 82 controlled closing are controlled by " liquid flow distribution " in flow cross section between pressure regulator piston 43 and the annular table 57 thus, thereby pressurised fluid stream is restricted.Realize all that up to all pressure regulators pressure balance just removes the restriction to pressurised fluid stream, and it is irrelevant to flow to the amount and the load of consumer.This means in this example, the pressure regulator of medium load consumer is near a relatively large degree, and the position that the pressure regulator of two higher load consumers (200 crust, 300 crust) is taked is the neutral position of the position in neutral position shown in Fig. 4 a and small flow cross section shown in Figure 5.Move right by the internal piston 94 that pressure regulator piston 43 is adjoined relatively thread plug 44, according to Fig. 4, LS cross section 112 is closed by the control edge 110 of internal piston 94 and the control edge that is assigned with 114 controls that are fixed to shell, and being connected between radial hole 98 and the LS spring chamber 88 is interrupted (Fig. 4 a neutral position) like this.At Fig. 4 c) shown in the control position in, control ring 100 is roughly in the zone that forms between spring chamber 88 and the radial hole 98 between the platform.Subsequently, by radial hole 98, pilot hole radially be communicated with between extension part 105, internal piston 94 outer circumferential faces and pilot hole 92 inner circle walls the annular space and vertical recess 106 of radial ring 102, the leading pressure in metering orifice 24 outlet ports is indicated in the spring chamber 86, make the left side of pressure regulator piston 43 carry maximum load pressure like this, and carry the pressure in metering orifice 24 downstreams on its right side.

Little vertical recess 104 of internal piston and 106 and internal piston 94 and pilot hole between annular cavity also have following function: control oil can be controlled oily runner by discharging in the spring chamber that dwindles via this during the controlled motion of pressure regulating piston 43.22 discharges by LS spring chamber 88 are not always enough through the LS pipeline to control Shan in this case, and are not always enough soon, for example when the pressure regulator of extreme load pressure exchanges.

Figure 6 shows that the functional diagram of " liquid stream savings " serviceability corresponding with answering Fig. 1.The leading induced pressure of supposing minimum load pressure consumer 4 is 35 crust, and the induced pressure of other consumers is respectively 50,100 and 200 crust.The long-pending flowing pressure of pressured fluid at the inlet P place of variable displacement pump 2 savings is 25 crust, and applies the pressure of 400 crust in the reflux pipeline 40 (being actually supply pipeline) that is caused

consumer

4,6,8,10 by terminal R.

Because supply line 36 is low pressure in (25 crust), and internal piston 94 is moved to the left by the effect of elevated pressures on its right side, adjacent up to the bottom of the pressure chamber 70 of its left side and thread plug 46.As shown in Figure 6, this kind variation occurs in all

Flow valves

12,14,16,18.

At the control initial stage, the pressure liquid that flows to the pressure regulator of consumer has minimum fluid resistance, and this this consumer is the higher load consumer when liquid stream savings, and its pressure regulator is reacted at first like this.The pressure regulator 26 of minimum load consumer 4 remains on or moves to its middle position.The axial length of control ring 100 is moved to the left internal piston 94 by relative pressure regulating piston 43 so right LS control edge 108 is worked through selecting.Foregoing is embodied among Fig. 7 b.Distribute to the load indicating positions of pressure regulator 26 of minimum load consumer (internal piston 94 moves to left at this kind, pressure regulator piston 43 is based on its medium position), a LS cross section 112 is opened at LS control edge 108, and this cross section is limited by the control edge 114 of spring chamber one side in shell one side.Be communicated with via open LS cross section 112 between pressure chamber 54 and the LS spring chamber 88, minimum load pressure (35 crust) is indicated in the LS pipeline 22 like this, and therefore is applied in the LS spring chamber of all Flow valves 12,14,16,18.This minimum load pressure also affacts on the right side of pressure regulator piston 43 of Flow valve 12, makes the latter keep position in the central like this.As shown in Figure 8, owing to the pressure regulator of pressurised fluid stream to other higher load consumers, its pressure regulator piston 43 is moved toward the left side and enters control piston (please consulting Fig. 7 c simultaneously).In this control position, the cross section of the opening of the pressure regulator 26 of higher load consumer 14,16,18 changes owing to " liquid stream savings " controls the edge in this control piston, and pressurised fluid stream is restricted before reaching equilibrium of forces.Therefore, pressure liquid can be flowed back to by consumer, and irrelevant with load, wherein pressure drop is constant remains on the corresponding metering orifice 24.The pressure regulator piston on the equilibrium position 43 be one with respect to neutral position (Fig. 7 a) and show the relative position of the internal piston 94 between the control position (Fig. 7 c), this depends on the induced pressure that higher load pressure place is leading.In the neutral position of Fig. 7 a, controlled edge 108,114, LS cross section is closed, in the control position shown in the figure, because pressure regulator piston 43 is by neutral position axial displacement left, control ring 94 is placed in the land regions between radial hole 98 and the LS spring chamber 88.

The loop symbol that has shown Flow valve of the present invention among Fig. 9.For example, terminal P, S, A and LS are represented and comprised to the valve that is assigned to consumer 4 by dot and dash line.Force feed valve 28,

variable metering orifice

24 and 2/2 mouthful of position control valve of pressure regulator 26 usefulness show that this position control valve is made of the internal piston 94 that imports pressure regulator piston 43 in concrete technological scheme in valve.As shown in Figure 9, this internal piston and pressure regulator 26 mechanical connections.The pump function of being discharged by ramp way 66 is in the left side of internal piston 94, and leading pressure acts on the right side in the pressurised fluid stream passage between metering orifice 24 and pressure regulator 26 that radial hole 98 is discharged.During " liquid flow distribution ", internal piston 94 is moved to the block that is fixed on the shell, is thread plug 44 herein, and during " accumulation of liquid stream ", internal piston 94 is relied on the block of thread plug 46 formation.

In the home position that pressure regulator 26 is opened, leading pressure between metering orifice 24 and the pressure regulator 26 is indicated in the LS spring chamber 88 via

internal piston

94 and 2/2 mouthful of position control valve suitably opening and enters LS pipeline 22, and is applied to the spring chamber 88 of all Flow valves.When pressure regulator is moved to the control position by open position, internal piston 94 is moved in the locked position of demonstration by the mechanical axis connection, and metering orifice 24 no longer can be discharged via 2/2 mouthful of position control valve (internal piston 94) to the leading pressure in the pressurised fluid stream passage between the pressure regulator 26 like this.In Fig. 9, the leading pressure in the LS pipeline 22 also is applied to the end face of the internal piston 94 on right side.

Pressure regulator piston 43 carries the pressure in the LS passage 22 on the one hand, carry the pressure of discharging on the other hand via the vertical recess between metering orifice 24 and the pressure regulator 26 106, when state's balance, the be under pressure restriction of regulator 26 of pressurised fluid stream, the pressure drop on the metering orifice 24 keeps constant and is irrelevant with load like this.

As previously mentioned, the control initial stage distribute to consumer with minimum fluid resistance and be subjected at first maximum flow pressure liquid pressure regulator 26 at first work.When " liquid flow distribution ", this pressure regulator is exactly a pressure regulator of distributing to the minimum load consumer, and when " liquid stream savings ", the pressure regulator of distributing to the maximum load consumer at first works.

The present invention has disclosed Flow valve and has been used for the fluid flow distributor of a plurality of consumer pressure liquid supplies.Each Flow valve comprises metering orifice and pressure regulator.Have two control edges on the pressure regulator piston of pressure regulator, one of them works during " the liquid stream savings " of pressurised fluid stream, and another works during " the liquid flow distribution " of pressurised fluid stream.Described Flow valve also comprises at least one LS control edge, can control the LS cross section when pressure regulator is opened by this control edge and open, and the pressure corresponding with induced pressure is indicated in the load pipeline via this LS cross section.

Claims

1. Flow valve that is used for flow distributor, this flow distributor is a plurality of hydraulic consumers (4,6,8,10) provide pressure liquid, this Flow valve comprises pressure regulator (26) and metering orifice (24), pressurised fluid stream can be flow through by this metering orifice (24), so that at consumer (4,6,8,10) direction is with the liquid flow distribution, and in the opposite direction pressurised fluid stream is put aside, wherein pressure regulator (26) comprises the pressure regulator piston (43) that is headed into the home position, on the one hand can apply leading pressure in the LS pipeline (22) to this pressure regulator piston (43), can apply leading pressure in the pressurised fluid stream passage between metering orifice (24) and the pressure regulator (26) to this pressure regulator piston (43) on the other hand, it is characterized in that

Described pressure regulator piston (43) comprises two control edges (82,84), one of them control edge works in liquid stream savings process, another control edge works in liquid flow distribution process, and, a LS control edge (108,110) also is provided at least, when pressure regulator (26) when being opened, for load being indicated in the LS pipeline (22), control edge (108,110) to the LS cross section by this LS. (112) are controlled, and this LS cross section (112) are opened so that pressure leading in the pressurised fluid stream passage is discharged.

2. the Flow valve that is used for flow distributor according to claim 1 is characterized in that wherein said pressure regulator (26) is opened in the home position.

3. the Flow valve that is used for flow distributor according to claim 1 and 2, it is characterized in that wherein LS control edge (108) works during liquid stream savings, and another LS control edge (110) works during the liquid flow distribution, and these two control edges are formed by 2/2 mouthful of position control valve.

4. the Flow valve that is used for flow distributor according to claim 3, it is characterized in that wherein said 2/2 mouthful of position control valve is to be formed by the internal piston (94) that guides in the pilot hole (92) of described pressure regulator piston (43), and this internal piston (94) comprises control ring (100) at two annular end face places, and this control ring (100) is provided with two LS control edge (108,110).

5. the Flow valve that is used for flow distributor according to claim 4 is characterized in that and can apply pump pressure on an end face of internal piston (94), and apply the pressure corresponding with induced pressure on another end face of internal piston (94).

6. according to claim 4 or the 5 described Flow valves that are used for flow distributor, it is characterized in that wherein said LS pipeline (22) leads to the LS spring chamber (88) of pressure regulator (26), and being used between the passage (98) of LS control edge (108,110) control wherein said LS spring chamber (88) that can be by control ring (100) and pressure regulator piston (43) guides the LS cross section (112) of induced pressure to open.

7. the Flow valve that is used for flow distributor according to claim 6, it is characterized in that wherein said LS spring chamber (88) is communicated with spring chamber (86) by the communication passage of extending between internal piston (94) and the pilot hole (92), the end of radially takeing in of internal piston is stretched into this spring chamber (86) also to face toward block (44) mobile.

8. the Flow valve that is used for flow distributor according to claim 7, the other end that it is characterized in that wherein said internal piston (94) is passed LS spring chamber (88) and be directed to ring (96) guiding in the pressure chamber (70) of thread plug (46), pump pressure is applied on this thread plug (46), and this thread plug (46) has the block that is provided with for internal piston (94).

9. according to claim 7 or the 8 described Flow valves that are used for flow distributor, it is characterized in that wherein said internal piston (94) comprises is used for the radial ring (102) of in pilot hole (92) direct internal piston (94), and go up formation vertical recess (104,106) in radial ring (98) and control ring (100), and the adjacent area of internal piston (94) is designed to have radial clearance, thereby forms communication passage.

10. according to the described flow distributor Flow valve that is used for of aforementioned arbitrary claim, it is characterized in that wherein said pressure regulator piston (43) comprises the central control flume (81) that is positioned at the ring end face, on this end face, form two control edges (82,84), and described pressure regulating piston (43) is headed into middle position by two aligning springs (50,52).

11. the Flow valve that is used for flow distributor according to claim 10, it is characterized in that wherein said pressure regulator piston (43) has at least one radial hole (98) perforate, on the one hand, in control ring (100), enter the zone of pilot hole (92), and enter on the other hand, the chamber (54) of guiding induced pressure.

12., it is characterized in that it comprises force feed valve (28) according to the described flow distributor Flow valve that is used for of aforementioned arbitrary claim.

13. be used for being a plurality of consumer supply pressure flow quantity distributors that it is a plurality of according to the described Flow valve of aforementioned arbitrary claim (12,14,16,18) to it is characterized in that it has.