CN1295441C - Proportional differential pressure control valve - Google Patents
Proportional differential pressure control valve Download PDFInfo
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- CN1295441C CN1295441C CNB2004100679752A CN200410067975A CN1295441C CN 1295441 C CN1295441 C CN 1295441C CN B2004100679752 A CNB2004100679752 A CN B2004100679752A CN 200410067975 A CN200410067975 A CN 200410067975A CN 1295441 C CN1295441 C CN 1295441C
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Abstract
The present invention relates to a proportional difference pressure control valve which is improved on the basis of an original valve body, a valve core, a proportion signal generator, a pressure port, a control port, a drainage port, etc., namely that a circular bead which is close to a first chamber and a second circular bead which is close to the fifth chamber are respectively arranged on the valve core; under cutting slots are respectively arranged on passages on the corresponding positions of the two circular beads to form a second chamber and a fourth chamber, and the drainage port and the pressure port are communicated with the second chamber and the fourth chamber; the opposite sides of the first circular bead and the second circular bead respectively form a first control side and a second control side with the first chamber and the second chamber; the first chamber and the fourth chamber and the third chamber cavity and the fifth chamber are communicated by technological holes; when the proportion signal generator is in a natural state, the first control side is in a normally closed state, and the second control side is in a normally opened state. After the structure is used, a variable damping hole is formed between the second circular bead and the fourth chamber following the movement of the valve core in the passages, and the hole diameter of the variable damping hole is larger than the hole diameter of a fixed damping hole. Therefore, a pass flow rate is increased under the same electromagnetism thrust force. Consequently, the present invention can be used for difference pressure control with high flow rate or guide stage control to satisfy the control requirements at different occasions.
Description
Technical field
The present invention relates to a kind of hydraulic control valve, especially refer to a kind of guide's control that is applicable to electro-hydraulic proportional flow valve or be directly used in the hydraulic system reduce pressure, to obtain the proportional differential pressure control valve of secondary pressure.
Background technique
In hydraulic transmission and control, be used for the ratio pressure Flow valve, proportional flow control valve, the pilot stage of proportion directional Flow valve, the general fixedly pilot controlled slide valve of damping hole of electro-hydraulic proportional reducing valve or band that adopts, as publication number is a kind of design proposal the Chinese invention patent application " pressure difference feedback type precontrolled slide valve " of CN1337539A has just disclosed, this control guiding valve comprises valve body, sliding spool, proportion electro-magnet and the first main hydraulic fluid port that is positioned on the valve body, second main hydraulic fluid port and the drain tap, be provided with the crosspassage of the horizontal arrangement that is complementary with described sliding spool in the valve body, described sliding spool is provided with a cylinder boss, this cylinder boss can move with described sliding spool, block or open the control port that forms between cylinder boss and valve body, one end of sliding spool contacts with the push rod of described proportion electro-magnet is concentric, the other end and spring offset, the place, left side of valve body is provided with and is communicated with the first main hydraulic fluid port and the horizontal left channel of left end all, the center of described valve body then is provided with an end and is connected with crosspassage, the vertical passage that the other end is connected with the second main hydraulic fluid port, between described left channel and described vertical passage, be provided with the damp channel of band damping hole, the upper end of described vertical passage is linked up mutually with the left end of the upper right side passage of described valve body, the right-hand member of described upper right side passage is linked up mutually with the right-hand member passage of described valve body, the right lower side of described valve body is provided with an end and is connected with drain tap, the right lower side passage that the crosspassage at the other end and cylinder boss right side place is linked up mutually.During work, because during hydraulic oil flow overdamping hole, the pressure reduction that produces between the first main hydraulic fluid port and the second main hydraulic fluid port can act on the two ends of sliding spool simultaneously, make sliding spool under the effect of electromagnetic push and pressure reduction, set up transient equiliblium, make control port have one and the corresponding opening degree of proportion electro-magnet electrical signal, thereby reach the purpose of hydraulic control.But find that in actual use when this control guiding valve was used for the occasion of big flow control, owing to be subjected to the restriction in damping hole aperture, its flow was less, can't satisfy the requirement of this big flow control; In addition, when its as one independently on-off valve carry out pressure reduction when control, the one-way cylinder that for example is used for the controlling combustion engine valve, equally, owing to be subjected to the restriction in damping hole aperture, make that the opening speed of oil cylinder piston is slower, resistance is big, so that must between the first main hydraulic fluid port and the second main hydraulic fluid port, add an Auxiliary valves, help piston as Pilot operated check valve and accelerate return speed, but so often make complex system and cost height, thereby in the time need being used for such occasion, above-mentioned pilot controlled slide valve need remain still further to be improved.
Summary of the invention
Technical problem to be solved by this invention is to provide the proportional differential pressure control valve that a kind of damping is variable and flow is big at the present situation of prior art
The present invention solves the problems of the technologies described above the technological scheme that is adopted: this proportional differential pressure control valve comprises valve body, spool and scaling signal generating means, described valve body is provided with pressure port, control mouth and drain tap, described spool is positioned at the passage that is complementary with it on the valve body, wherein, described pressure port is connected with first cavity volume that the passage that is positioned at spool one end forms by first oil circuit, and the 5th cavity volume that the passage of scaling signal generating means and the spool the other end forms is connected and offset with the end face of this end of spool, described control mouth then is connected with the 3rd cavity volume that the passage of spool center forms, and be connected with the 5th cavity volume by second oil circuit, it is characterized in that: be respectively equipped with first shoulder of contiguous first cavity volume and second shoulder of contiguous the 5th cavity volume on the described spool, with have undercut groove to form second cavity volume and the 4th cavity volume on the passage of this two shoulders corresponding position, described drain tap and pressure port respectively with second cavity volume, the 4th cavity volume is connected, the opposite side of described first shoulder and second shoulder respectively with described second cavity volume, form the first control limit and the second control limit between the 4th cavity volume, and described scaling signal generating means is under nature, the described first control limit is a normally off, and the described second control limit is a normally open.
The described first control limit can be to form between the described first shoulder side and the second cavity volume side, also can be in the following way: be provided with a plurality of axial chutes that are communicated with second cavity volume and the 3rd cavity volume that move with spool at the described first shoulder outer surface, formed the above-mentioned first control limit between this axial chute and the second cavity volume side, the latter's design can be so that the opening degree on the first control limit be as much as possible little, to reduce internal system reactive power consumption flow.
In described first cavity volume, can be provided with and make spool have spring all the time to scaling signal generating means side shifting trend, this spring adopts rigidity less, i.e. relative softer spring, so that the scaling signal generating means is under nature, the first control limit is in reliable closed condition.
Described scaling signal generating means can be proportion electro-magnet, or is torque motor, also can be electromechanical converter.
Described first oil circuit can be for being positioned at first interconnection channel that is communicated with first cavity volume and the 4th cavity volume on the spool; Also can make structure simpler for being positioned at the auxiliary hole that is communicated with first cavity volume and pressure port on the valve body, easy to process; Can certainly adopt and be positioned at outer first pipeline that is communicated with first cavity volume and pressure port of valve body.
And described second oil circuit can be for being positioned at second interconnection channel that is communicated with the 3rd cavity volume and the 5th cavity volume on the valve body; Also can be for being positioned at outer second pipeline that is communicated with the 5th cavity volume and control mouth of valve body.
Compared with prior art, the invention has the advantages that: after adopting said structure, along with spool moving in passage, formed between second shoulder and the 4th cavity volume side one with the corresponding adaptive damping of scaling signal generating means hole, and its aperture is far longer than the fixedly aperture of damping hole, therefore, under same electromagnetic push, the flow that flows through also just increases, thereby makes it can be used for the pressure reduction control or the pilot stage control of the big flow of needs, to satisfy the control needs of different occasions.
Description of drawings
Fig. 1 is the structural representation of the first embodiment of the present invention;
Fig. 2 is a first embodiment of the invention as the structural representation after pilot stage and the main valve configuration;
Fig. 3 is used for the structural representation that engine valve singly goes out rod oil cylinder control for first embodiment of the invention;
Fig. 4 is the structural representation of the second embodiment of the present invention.
Embodiment
Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.
As shown in Figure 1, this proportional differential pressure control valve comprises valve body 1, spool 2 and scaling signal generating means, wherein the scaling signal generating means adopts proportion electro-magnet (not looking among the figure), described valve body 1 is provided with pressure port P, control mouthful A and drain tap T, and spool 2 is positioned at the passage that is complementary with it on the valve body 1, thereby make first cavity volume 11 of the passage formation that is positioned at spool 2 one ends (being the left end of spool), be positioned at the 5th cavity volume 15 of the passage formation of spool 2 the other ends (being the right-hand member of spool), and the 5th cavity volume 15 communicates with the inner chamber of proportion electro-magnet, and 4 end faces with spool 2 these ends of the push rod of proportion electro-magnet offset; And be provided with softer spring 3 in described first cavity volume 11, these spring 3 one ends are mutually low with spool 2 left sides, the other end and spring seat offset, and spring seat and valve body 1 are tightly connected, make spool 2 have trend all the time, thereby guarantee that the push rod 4 of spool 2 and electromagnet is in contacted state all the time in the working procedure to the electromagnet side shifting.
On spool 2, also be respectively equipped with simultaneously first shoulder 21 of contiguous first cavity volume 11 and second shoulder 22 of contiguous the 5th cavity volume 15, with have undercut groove to form second cavity volume 12 and the 4th cavity volume 14 on the passage of this two shoulders corresponding position, and between second cavity volume 12 and the 4th cavity volume 14, form the 3rd cavity volume 13, promptly the passage of spool 2 center forms the 3rd cavity volume 13.The opposite side of above-mentioned first shoulder 21, second shoulder 22 forms the first control limit C1 and the second control limit C2 respectively and separately between the cavity volume side, when proportion electro-magnet under nature, promptly do not have under the state of electrical signal, under the effect of above-mentioned soft spring 3 and remaining pressure reduction, the described first control limit C1 is a normally off, and the second control limit C2 is a normally open.
Above-mentioned pressure port P is connected with the 4th cavity volume 14, and be connected with first cavity volume 11 by first oil circuit, and a described control mouthful A is connected with the 3rd cavity volume 13, and be connected with the 5th cavity volume 15 by second oil circuit, in the present embodiment, first oil circuit is first interconnection channel 23 that is positioned on the spool 2 or is communicated with first cavity volume 11 and the 4th cavity volume 14 at valve body 1, and second oil circuit is to be positioned at second interconnection channel 16 that is communicated with the 3rd cavity volume 13 and the 5th cavity volume 15 on the valve body 1, and described drain tap T then directly is connected with second cavity volume 12.
When this control valve uses as guide's controlled stage, as shown in Figure 2, it is on the 3BY2-G125B type ratio pressure flow combined valve 5 that this control valve is assemblied in model, be connected with valve body of main valve 51 by screw, make the pressure port P of control valve be connected with the snout cavity C of main valve, the control mouth A of control valve links to each other with the epicoele D of main valve, and the drain tap T of control valve communicates with the draining chamber L of main valve.
Its working principle is as follows: during beginning, when the electric current of proportion electro-magnet is zero, be the thrust F=0 of proportion electro-magnet, this moment is if control valve spool 2 is in opening state, the pressure that then draws the self-hydraulic system is to be divided into the end that first interconnection channel 23 of two tunnel, one road hydraulic oil on spool 2 acts on spool 2 after the pressure oil of P enters the 4th cavity volume 14 through the pressure port P of the oil suction chamber C of main valve, control valve; Another road hydraulic oil is by the second control limit C2, the 3rd cavity volume 13, the first control limit C1 is after drain tap T, the draining chamber L of main valve flows to fuel tank, pressure oil is after controlling limit C2 through second, pressure is reduced to P1 by P, another road hydraulic oil after this step-down is by the 3rd cavity volume 13 simultaneously, second interconnection channel 16 on the valve body acts on the other end of spool, i.e. the 3rd cavity volume 13, be full of the hydraulic oil that pressure is P1 in second interconnection channel 16 and the 5th cavity volume 15, this pressure P 1 acts on the other end of spool 2, pressure differential deltap P is applied to the two ends of spool like this, make spool drive two shoulders on it to the 5th cavity volume 15 side shiftings, until first shoulder 21 the first control limit C1 is closed, hydraulic oil stops to flow, the pressure reduction of oil everywhere in the control valve is zero, control valve is in closed condition, just main valve plug epicoele D oil pressure equates with oil pressure between the snout cavity C, main valve is under the effect of self spring 52 restoring force, close between the snout cavity C of main valve and the outlet plenum B, promptly main valve does not have flow output yet.
When proportion electro-magnet passes to certain electric current, produce the electromagnetic push F that is directly proportional with electric current, this electromagnetic push F overcomes the active force of spring 3, make spool 2 to first cavity volume, 11 side shiftings, the first control limit C1 is opened, identical with above-mentioned principle, pressure is that the hydraulic oil part of P acts on an end of spool 2 by first interconnection channel 23, and another part pressure oil is after through the second control limit C2, and pressure is reduced to pressure P 1 by P, if Δ P=P-P1, the snout cavity C of main valve plug and the pressure of epicoele D are respectively P and P1 at this moment, under the effect of Δ P, and compression main spool spring 52, main valve plug 53 is opened, and main valve promptly has flow output.This pressure is the other end that the hydraulic oil of P1 acts on spool 2 simultaneously, be that pressure differential deltap P also is applied to the spool two ends simultaneously, generation promptly is feedback effect power to electromagnet to the active force of the 5th cavity volume 15 sides, and this active force overcomes electromagnet thrust F, make spool drive two shoulders to the 5th cavity volume 15 side shiftings, this moment, the opening degree of the first control limit C1 reduced, and control flow rate descends, and Δ P also descends, spool reaches new transient equiliblium soon, and the condition of this transient equiliblium is as follows:
ΔP×лd
2/4+F
s＝F
Wherein: Δ P is the pressure reduction between pressure port and the control mouth;
D is the diameter of spool upper shoulder;
F
sBe spring force;
F is an electromagnetic push; (power of surging of ignoring spool in the formula)
Because spring force F
sSmaller, therefore can obtain pressure reduction is directly proportional with electromagnetic push, that is to say when the oil pressure at the two ends of spool and electromagnet thrust F balance each other, spool reaches the corresponding transient equiliblium of the electrical signal with proportion electro-magnet, and obtained stable pressure reduction this moment between pressure port P and control mouthful A.The opening degree of this pressure reduction may command main valve plug 53 makes main valve output stable flow rate.
When the proportion electro-magnet electric current increases, electromagnetic push F overcomes the two ends pressure differential deltap P of spool, make spool 2 drive two shoulders to first cavity volume, 11 side shiftings, the opening of the first control limit C1 is increased, then pressure is that the hydraulic oil of P also increases through the second pressure differential deltap P of control behind the C2 of limit, be the pressure reduction increase between pressure port P and the control mouthful A, the snout cavity C of main valve plug and the pressure reduction between epicoele D are also increased, finally cause snout cavity C to flow to the proportional increase of flow of outlet plenum E.This pressure differential deltap P affacts the two ends of spool simultaneously, promotes spool 2 to the 5th cavity volume 15 side shiftings, and final and electromagnetic push F reaches till the transient equiliblium.
Otherwise, when the proportion electro-magnet electric current reduces, the two ends pressure differential deltap P of spool overcomes electromagnetic push F, make spool and two shoulders to the 5th cavity volume 15 side shiftings, the opening of the first control limit C1 is reduced, and then pressure is that the hydraulic oil of P also reduces through the second pressure differential deltap P of control behind the C2 of limit, and promptly the pressure reduction between pressure port P and control mouthful A reduces, the snout cavity C of main valve and the pressure reduction between epicoele D reduce, and make snout cavity C flow to proportional the reducing of flow of outlet plenum E.This pressure differential deltap P affacts the two ends of spool 2 simultaneously, and spool 2 is stopped to the 5th cavity volume 15 side shiftings, and final and electromagnetic push F reaches till the transient equiliblium.
When being used for engine valve, this control valve singly goes out rod oil cylinder when control, as shown in Figure 3, then its pressure port P, control mouthful A link to each other with the left and right chamber of oil cylinder 6 by oil inlet pipe, oil outlet tube respectively, with in like manner above-mentioned, when on the first control limit C1, having flow to flow through, on the second control limit C2, will produce pressure reduction, this pressure reduction will be applied directly to the left and right chamber of oil hydraulic cylinder 6, increase if make a concerted effort, spring 7 then gradually reduces, piston 8 chamber motion to the right drives valve head 9 by piston rod and moves right, and balances each other until the active force of making a concerted effort with spring 7; In like manner, if make a concerted effort to reduce, then under the effect of spring 7 restoring forces, piston 8 drives valve head 9 to left movement to left movement, also balances each other until the restoring force of making a concerted effort with spring 7; Under above-mentioned two states, piston 8 transfixions make to obtain a spacing correspondingly between valve head 9 and the valve seat.
When piston motion when the terminal point in oil cylinder 6 right chambeies need return, this moment, electromagnetic push F was zero, the flow that flows through control valve reduces to zero suddenly, Δ P=0 then, an oil cylinder left side, the oil pressure in right chamber equates, under the effect of spring 7 restoring forces, the quick left lateral of piston, because control valve is in closed condition, this moment, the oil in piston 8 compressing oil cylinders 6 left chambeies flowed to control mouthful A from pressure port P, to produce pressure reduction at the second throttling limit C2, this pressure reduction is by first interconnection channel 23, second interconnection channel 16 acts on the two ends of spool 2, makes spool 2 to the 5th cavity volume 15 side shiftings, and then the second control limit C2 increases, flow is unimpeded, valve returns rapidly, and therefore, need not to be provided with the return speed of accelerating valve as the Auxiliary valves of Pilot operated check valve and so on this moment between the left chamber of oil hydraulic cylinder and chamber, the oil hydraulic cylinder right side, make system simpler, reliably, and still can reach the purpose of valve quick return.
Second embodiment, as shown in Figure 4, it is with first embodiment's difference: be provided with at first shoulder, 21 outer surfaces and a plurality ofly move the axial chute 24 that is communicated with second cavity volume 12 and the 3rd cavity volume 13 with spool 2, formed the described first control limit C1 between this axial chute 24 and second cavity volume, 12 sides.When present embodiment is used for the control of engine valve one-way cylinder, working oil mainly flows between pressure port P and control mouthful A mutually, get final product and only need keep the required oil stream of the second control limit C2 decompression between control mouthful A and the relief port T, therefore, described axial chute 24 can reduce the opening degree of the first control limit C1 as much as possible, to reduce the flow of internal system reactive power consumption, therefore use energy-conservation more.
Claims (10)
1, a kind of proportional differential pressure control valve, it comprises valve body (1), spool (2) and scaling signal generating means, described valve body is provided with pressure port (P), control mouthful (A) and drain tap (T), described spool is positioned at the passage that is complementary with it on the valve body, wherein, described pressure port (P) is connected with first cavity volume (11) that the passage that is positioned at spool one end forms by first oil circuit, and the 5th cavity volume (15) that the passage of scaling signal generating means and the spool the other end forms is connected and offset with the end face of this end of spool, described control mouthful (A) then is connected with the 3rd cavity volume (13) that the passage of spool center forms, and be connected with the 5th cavity volume (15) by second oil circuit, it is characterized in that: be respectively equipped with first shoulder (21) of contiguous first cavity volume (11) and second shoulder (22) of contiguous the 5th cavity volume (15) on the described spool (2), with have undercut groove to form second cavity volume (12) and the 4th cavity volume (14) on the passage of this two shoulders corresponding position, described drain tap (T) and pressure port (P) respectively with second cavity volume (12), the 4th cavity volume (14) is connected, the opposite side of described first shoulder (21) and second shoulder (22) respectively with described second cavity volume (12), form the first control limit (C1) and the second control limit (C2) between the 4th cavity volume (14), and described scaling signal generating means is under nature, the described first control limit (C1) is a normally off, and the described second control limit (C2) is a normally open.
2, proportional differential pressure control valve according to claim 1 is characterized in that: the described first control limit (C1) forms between described first shoulder (21) side and second cavity volume (12) side.
3, proportional differential pressure control valve according to claim 1, it is characterized in that: described first shoulder (21) outer surface is provided with and a plurality ofly moves the axial chute (24) that is communicated with second cavity volume (12) and the 3rd cavity volume (13) with spool, has formed above-mentioned first between this axial chute (24) and second cavity volume (12) side and has controlled limit (C1).
4, according to claim 1 or 2 or 3 described proportional differential pressure control valves, it is characterized in that: in described first cavity volume (11), be provided with and make spool (2) have spring (3) all the time to scaling signal generating means side shifting trend.
5, according to claim 1 or 2 or 3 described proportional differential pressure control valves, it is characterized in that: described scaling signal generating means is proportion electro-magnet or torque motor or electromechanical converter.
6, according to claim 1 or 2 or 3 described proportional differential pressure control valves, it is characterized in that: described first oil circuit is for being positioned at first interconnection channel (23) that is communicated with first cavity volume (11) and the 4th cavity volume (14) on the spool.
7, according to claim 1 or 2 or 3 described proportional differential pressure control valves, it is characterized in that: described first oil circuit is for being positioned at the auxiliary hole that is communicated with first cavity volume (11) and pressure port (P) on the valve body.
8, according to claim 1 or 2 or 3 described proportional differential pressure control valves, it is characterized in that: described first oil circuit is for being positioned at outer first pipeline that is communicated with first cavity volume (11) and pressure port (P) of valve body.
9, according to claim 1 or 2 or 3 described proportional differential pressure control valves, it is characterized in that: described second oil circuit is for being positioned at second interconnection channel (16) that is communicated with the 3rd cavity volume (13) and the 5th cavity volume (15) on the valve body.
10, according to claim 1 or 2 or 3 described proportional differential pressure control valves, it is characterized in that: described second oil circuit is for being positioned at outer second pipeline that is communicated with the 5th cavity volume (15) and control mouthful (A) of valve body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100679752A CN1295441C (en) | 2004-11-05 | 2004-11-05 | Proportional differential pressure control valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100679752A CN1295441C (en) | 2004-11-05 | 2004-11-05 | Proportional differential pressure control valve |
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| CN1603635A CN1603635A (en) | 2005-04-06 |
| CN1295441C true CN1295441C (en) | 2007-01-17 |
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| CNB2004100679752A Expired - Fee Related CN1295441C (en) | 2004-11-05 | 2004-11-05 | Proportional differential pressure control valve |
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Also Published As
| Publication number | Publication date |
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| CN1603635A (en) | 2005-04-06 |
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