CN101769273B

CN101769273B - Pressure tracking valve

Info

Publication number: CN101769273B
Application number: CN2009101554009A
Authority: CN
Inventors: 魏建华; 杜恒
Original assignee: Zhejiang University ZJU
Current assignee: Zhejiang University ZJU
Priority date: 2009-12-22
Filing date: 2009-12-22
Publication date: 2012-03-07
Anticipated expiration: 2029-12-22
Also published as: CN101769273A

Abstract

The invention discloses a pressure tracking valve. In a valve sleeve, a second damper and a plug are arranged at the two ends of the valve sleeve respectively and are in threaded connection with the valve sleeve; a valve plug is positioned between the second damper and the plug and is in sliding fit with the valve sleeve; a blind hole opposite to the plug is formed in the valve plug; a first damper is arranged at the inlet of the blind hole and is in threaded connection with the valve plug so as to form a first control accommodating cavity between the first damper and the plug and form a working accommodating cavity in the blind hole of the valve plug; a second control accommodating cavity is formed between the second damper and the valve plug; a first damping hole of the first damper is communicated with the first control accommodating cavity and the working accommodating cavity; a second damping hole of the second damper is communicated with the second control accommodating cavity; a first working oil port and a first oil inlet are formed on the wall of the working accommodating cavity of the valve plug sequentially along the direction from the first damping hole to the bottom of the blind hole; a second working oil port and a second oil inlet are correspondingly formed on the wall of the valve sleeve sequentially; the first working oil port is communicated with the second working oil port; and the first oil inlet is adjacent to the second oil inlet.

Description

Pressure tracking valve

Technical field

The invention belongs to the Fluid Transmission and Control field, relate to hydrovalve, be applicable to that the final controlling element that is connected with flexible member in the hydraulic system needs the occasion of hard and soft switching, is particularly useful for the occasion that the no compression shock of needs switches.

Background technique

In the hydraulic system of applications such as engineering machinery, Aero-Space, boats and ships, military affairs, often use elastic element such as accumulator etc. that system is played the effect of buffer shock-absorbing, but when final controlling element need move; Usually need cut off accumulator again to guarantee not receive in the movement process influence of flexible members such as accumulator; Make the motion of final controlling element controlled, can proper motion to guarantee final controlling element, when cutting off after accumulator makes actuator motions; Because the change of load before and after the movement process; Can cause accumulator different, and need insert accumulator under the normality operating mode, can occur strong vibration when again accumulator being communicated with this moment and be prone to accidents caused with the final controlling element internal pressure.Conventional method promptly adds pressure transducer and detects accumulator and final controlling element internal pressure in hydraulic system; The detected pressures value gets into controller and result of calculation is exported to corresponding hydraulic element after through certain algorithm and carry out closed loop control; Realize that flexible member such as accumulator equate with final controlling element such as oil hydraulic cylinder internal pressure; Connect to realize do not have impact switch again, but this kind system has several defectives: the one, complex structure, cost are higher, not only need pressure transducer, controller; Also need corresponding proportioning element that system is controlled, and need the certain control algorithm of establishment; The 2nd, because the application environment is abominable mostly, this system adopts automatically controlled and components and parts are more, and accident appears in poor reliability easily.

Summary of the invention

The objective of the invention is to above-mentioned defective, a kind of simple in structure, the pressure tracking valve that can realize good pressure tracking performance that cost performance is high is provided.

For realizing above-mentioned purpose; The technological scheme that the present invention taked is: this pressure tracking valve mainly comprises valve pocket and the spool, first damper, second damper and the screw plug that place in the valve pocket, and second damper and screw plug form scyewed joint at two ends and this valve pocket of valve pocket respectively; Spool forms between second damper and screw plug and with valve pocket and is slidingly matched; Be provided with blind hole in the spool; This blind hole and screw plug are relative, and first damper makes to win to form between damper and the screw plug in the first control cavity volume and the blind hole at spool in the ingress of this blind hole and spool scyewed joint and forms the work cavity volume; Form the second control cavity volume between second damper and the spool; First damper is provided with first damping hole that is communicated with the first control cavity volume and work cavity volume respectively, and second damper is provided with second damping hole that is communicated with the second control cavity volume; Bottom direction from first damping hole to blind hole on the wall of the work cavity volume of spool is provided with first actuator port and first filler opening successively; Correspondingly be provided with second actuator port and second filler opening on the wall of valve pocket successively; First actuator port and second actuator port are communicated with, and first filler opening is adjacent with second filler opening.

Further; The wall of the work cavity volume of spool according to the invention is provided with first return opening; Correspondingly be provided with second return opening on the wall of valve pocket; First return opening is adjacent with second return opening, and said first actuator port is between first return opening and first filler opening, and said second actuator port is between second return opening and second filler opening.

Further, along the circumferential direction be provided with spaced work circular groove and oil-feed circular groove on the inwall of valve pocket according to the invention respectively, said work circular groove is communicated with second actuator port, and the oil-feed circular groove is communicated with second filler opening.

Further; Along the circumferential direction be provided with spaced oil return circular groove, work circular groove and oil-feed circular groove on the inwall of valve pocket according to the invention respectively; Said oil return circular groove is communicated with second return opening; The work circular groove is communicated with second actuator port, and the oil-feed circular groove is communicated with second filler opening.

Further, screw plug according to the invention has first counterbore at its end relative with first damper, and said second damper has second counterbore at its end relative with spool.

Further, the present invention is provided with controlling device in second damping hole of said second damper, and this controlling device and second damping hole form screw-thread fit, and the inside of said controlling device is provided with the 3rd damping hole.

Compared with prior art, advantage of the present invention is:

(1) adopt machine liquid mode to control fully, be easy to realize another hydraulic element internal pressure of hydraulic element internal pressure real-time tracking, response frequency is high, and system works is stable, and reliability is high.

(2) component that adopt are few, practice thrift installing space, and cost performance is high.

(3) when the backpressure impact appears in the hydraulic element of cut-in pressure follow-up type valve actuator port, can effectively eliminate pressure spike and realize good tracking performance.

(4) the adjustment damper can be adjusted the dynamic characteristic of pressure tracking, regulates simple and convenient.

Description of drawings

Fig. 1 is the structure cross-sectional schematic of the pressure tracking valve of first kind of mode of execution of the present invention.

Fig. 2 is the fundamental diagram of pressure tracking valve of the present invention;

Fig. 3 is the structure cross-sectional schematic of the pressure tracking valve of second kind of mode of execution of the present invention.

Fig. 4 is the structure cross-sectional schematic of the pressure tracking valve of the third mode of execution of the present invention.

Embodiment

As shown in Figure 1, pressure tracking valve of the present invention mainly by valve pocket 4 with place spool 1 in the valve pocket 4, first damper 2, second damper 12 and screw plug 3, the second dampers 12 and screw plug 3 respectively at the two ends and this valve pocket 4 formation scyewed joint of valve pocket 4; Spool 1 forms between second damper 12 and screw plug 3 and with valve pocket 4 and is slidingly matched, and spool 1 is a moving element, can in valve pocket 4, do axial to-and-fro motion; Be provided with blind hole in the spool 1, the inlet of this blind hole is relative with screw plug 3, and first damper 2 makes to win in the ingress of this blind hole and spool 1 scyewed joint and forms the first control cavity volume 23 between damper 2 and the screw plug 3 and in the blind hole of spool 1, form work cavity volume 13; Form the second control cavity volume 20 between second damper 12 and the spool 1; First damper 2 is provided with first damping hole, 28, the second dampers 12 that are communicated with the first control cavity volume 23 and work cavity volume 13 and is provided with second damping hole 29 that is communicated with the second control cavity volume 20; Bottom direction from first damping hole 28 to the blind hole on the wall of the work cavity volume 13 of spool 1 is provided with the wall that first actuator port 31 and first filler opening, 32, the first actuator ports 31 and first filler opening 32 run through work cavity volume 13 successively; Equally, on the wall of valve pocket 4, correspondingly be provided with the wall that second actuator port 26 and second filler opening, 27, the second actuator ports 26 and second filler opening 27 run through valve pocket 4 successively; First actuator port 31 and second actuator port 26 are communicated with, and first filler opening 32 is adjacent with second filler opening 27.In order to let pressure tracking valve that better pressure tracking performance is arranged; The backpressure of eliminating the hydraulic element appearance of cut-in pressure follow-up type valve actuator port impacts; Can on the wall of the work cavity volume 13 of spool 1, be provided with first return opening 30; Correspondingly be provided with second return opening 25 on the wall of valve pocket 4; First return opening 30 is adjacent with second return opening 25, and first actuator port 31 is between first return opening 30 and first filler opening 32, and second actuator port 26 is between second return opening 25 and second filler opening 27.Because the circumferencial direction rotation can appear in spool 1 when in valve pocket 4, working; In order to guarantee that corresponding each hydraulic fluid port connects on above-mentioned each hydraulic fluid port and the valve pocket 4 on the spool 1; Can be respectively be provided with a plurality of equally distributed first return openings 30, first actuator port 31, first filler opening 32, second return opening 25, second actuator port 26, second filler opening 27 along spool 1 and circumferencial direction on the valve pocket 4; Even, also can normally connect between the corresponding hydraulic fluid port to guarantee to occur the situation that spool 1 along the circumferential direction rotates in valve pocket 4.Realize and normally on the inwall of valve pocket 4, along the circumferential direction be provided with spaced oil return circular groove 33, work circular groove 34 and oil-feed circular groove 35 in the industrial realization respectively; Wherein, Oil return circular groove 33 is communicated with second return opening 25; Work circular groove 34 is communicated with second actuator port 26, and oil-feed circular groove 35 is communicated with second filler opening 27, even spool 1 along the circumferential direction rotates the normal perforation that also can guarantee corresponding hydraulic fluid port on spool 1 and the valve pocket 4 in valve pocket 4 like this.When using pressure tracking valve of the present invention,

valve pocket

4 and 14 sealings of valve piece are installed together, can as shown in Figure 1ly on valve pocket 4, install

seal ring

5,6,8,10 and back-up

ring

7,9,11 respectively additional for this reason.Through cooperating of valve pocket 4 and valve piece 14, with second return opening 25 on the valve pocket 4 separate with the external world, second actuator port 26 separates with second return opening 25 and second filler opening 27, second filler opening 27 and second damping hole 29 separate.

Pressure tracking valve of the present invention is applied in the hydraulic system of actual use when realizing the pressure tracking of uniform pressure, and its fundamental diagram can be as shown in Figure 2, and at this moment, the area of the two ends end face of spool 1 is identical.Carry weight 17 when this hydraulic system can realize normality and alleviate the impact that is brought by weight 17 motions, when weight 17 stop motions and when needing jacking weight 17, control oil cylinder 18 is by certain velocity curve jacking.When the rodless cavity of oil cylinder 18 links to each other jacking weight 17 with accumulator 16, because weight 17 variation because of attitude in movement process can cause oil cylinder 18 suffered load variations, and because the existence of elastic element accumulator 16; The variation that can follow the tracks of load charges and discharge oil; Even passing ratio Flow valve 22 is the flow of control entering oil cylinder 18 accurately,, can make that oil cylinder 18 speed are uncontrollable because oil cylinder 18 suffered load variations cause that accumulator 16 charges and discharge oil; Eliminate its influence if cut off accumulator 16 this moment; Can be easy to oil cylinder 18 is realized accurately control, but put in place need insert accumulator 16 once more the time when oil cylinder 18 motions, because the oil cylinder 18 suffered variations that load on the motion front and back; This moment, oil cylinder 18 rodless cavity internal pressures and accumulator 16 internal pressures were unequal; Can vibrate when accumulator 16 is inserted oil cylinder 18, cause serious accident, this moment, the applying pressure follow-up type valve can fine head it off.When solenoid

directional control valve

15,19,23 is in dead electricity position and pumping source and cuts out; Accumulator 16 inserts the effect that oil cylinder 18 plays corresponding buffer shock-absorbing; When needs jacking weight 17 makes oil cylinder 18 motions; Can pumping source and solenoid

directional control valve

15,19,23 be opened; This moment, accumulator 16 broke off through solenoid directional control valve 19 and oil cylinder 18, and can effectively realize the control to oil cylinder 18 this moment through the control of Comparative Examples Flow valve 22, when oil cylinder 18 motions put in place when closing pumping source and solenoid

directional control valve

15,19,23; Because the existence of pressure tracking valve can make the pressure of accumulator 16 follow the tracks of the pressure in oil cylinder 18 rodless cavities all the time, insert accumulator 16 this moment and can realize not having impacting and switch.The pressure tracking valve working principle is following: when pumping source and solenoid

directional control valve

15,19,23 are opened; Accumulator 16 is access to the 3rd actuator port 40 on the valve piece 14 through solenoid directional control valve 15; Oil cylinder 18 rodless cavities also are access to the control port 43 on the valve piece 14 through solenoid directional control valve 15; And the oil circuit between accumulator 16 and oil cylinder 18 rodless cavities cuts off through solenoid directional control valve 19, and the work cavity volume 13 that this moment, the pumping source high pressure oil got in the spools 1 through second filler opening 27 on the 3rd filler opening 42 on the valve piece 14, the valve pocket 4, first filler opening 32 on the spool 1, fluid get in the accumulators 16 through second actuator port 26 on first actuator port 31 on the spool 1, the valve pocket 4, the 3rd actuator port 40 on the valve piece 14 again; And when accumulator 16 internal pressures are higher than oil cylinder 18 rodless cavity internal pressures; Because work cavity volume 13 inner fluids can get into the first control cavity volume 23 through first damping hole 28 of first damper 2, and the fluid in oil cylinder 18 rodless cavities can get into the second control cavity volume 20 through second damping hole 29 on second damper 12, this moment is because the pressure in the accumulator 16 is higher than oil cylinder 18 rodless cavity internal pressures; Then the pressure of the first control cavity volume 23 also will be higher than the pressure of the second control cavity volume 20; Effect lower valve core 1 in hydraulic coupling can move to the direction of second damper 12, and promptly can turn down first actuator port 32 on the spool 1 and the valve port that valve pocket 4 forms this moment, along with turning down of valve port; During the high pressure oil entering work cavity volume 13 of pumping source; Pressure drop meeting through this valve port increases, and causes the pressure of work cavity volume 13 to reduce, and then the pressure of the control cavity volume 23 of winning is reduced; When this pressure is reduced to when controlling cavity volume 24 pressure and equate; Spool 1 stops to move, and goes into transient equiliblium, so that accumulator 16 internal pressures equate with oil cylinder 18 rodless cavity internal pressures; When accumulator 16 internal pressures are lower than oil cylinder 18 rodless cavity internal pressures; Because work cavity volume 13 inner fluids can get into the first control cavity volume 23 through first damping hole 28 of first damper 2, and the fluid in oil cylinder 18 rodless cavities can get into the second control cavity volume 20 through second damping hole 29 on second damper 12, this moment is because the pressure in the accumulator 16 is lower than oil cylinder 18 rodless cavity internal pressures; Then the pressure of the first control cavity volume 23 also will be lower than the pressure of the second control cavity volume 20; Effect lower valve core 1 in hydraulic coupling can move to the direction of screw plug 3, and promptly can form valve port with valve pocket 4 with first actuator port 32 on the spool 1 and hold greatly this moment, along with opening of valve port is big; During the high pressure oil entering work cavity volume 13 of pumping source; Pressure drop meeting through this valve port reduces, and causes the pressure of work cavity volume 13 to raise, and then the pressure of the control cavity volume 23 of winning is raise; When this pressure is elevated to when controlling cavity volume 24 pressure and equate; Spool 1 stops to move, and goes into transient equiliblium, so that accumulator 16 internal pressures equate with oil cylinder 18 rodless cavity internal pressures; When pressure spike appears in other components and parts of the 3rd actuator port 40 on accumulator 16 or the cut-in valve piece 14; Can make the pressure of the 3rd actuator port 40 on the valve piece 14 raise suddenly; And then making the pressure of work cavity volume 13 raise suddenly, well follow the tracks of oil cylinder 18 rodless cavity internal pressures in order also to make the pressure in the accumulator 16 this moment, on the spool 1 of pressure tracking valve and valve pocket 4, is provided with first return opening 30 and second return opening 25 respectively; When pressure spike occurring; Suddenly the high pressure oil that raises in the work cavity volume 13 can get into the first control cavity volume 23 through first damping hole 28 in first damper 2, and this moment first, high pressure appearred in control cavity volume 23, and very big pressure reduction appears in spool 1 two ends; Hydraulic coupling promotes spool 1 and moves to second damper, 12 directions fast; Make first return opening 30 on the spool 1 communicate, get back to fuel tank through the 3rd return opening 41 on the valve piece 14 again, the pressure in the work cavity volume 13 are unloaded rapidly with second return opening 25 on the valve pocket 4; Eliminate pressure spike, improve the pressure tracking performance.

In order to guarantee pressure tracking valve ability proper functioning; The relative position that each hydraulic fluid port on spool 1 and the valve pocket 4 is set is following: when spool 1 moves to the position near screw plug 3; First return opening 30 on the spool 1 does not communicate with second return opening 25 on the valve pocket 4, and first filler opening 32 on the spool 1 communicates with second filler opening 27 on the valve pocket 4; When spool 1 moved to the position near second damper 12, first return opening 30 on the spool 1 communicated with second return opening 25 on the valve pocket 4, and first filler opening 32 on the spool 1 does not communicate with second filler opening 27 on the valve pocket.Screw plug 3 have first counterbore 36 with first damper, 2 relative ends; Second damper 12 have second counterbore 37 with spool 1 a relative end, the first control cavity volume 23 and second is controlled cavity volume 20 and is still existed in the time of can guaranteeing like this that spool 1 moves to limit position in valve pocket 4.

The another kind of structure of pressure tracking valve of the present invention is as shown in Figure 3.It is to have installed in the inside of second damper 12 controlling device 38 with Fig. 1 structure different; Pass through screw-thread fit between second damping hole 29 of second damper 12 and the controlling device 38; Controlling device 38 is the outside thread link that an inside is provided with the 3rd damping hole 39, for example screw, double-screw bolt etc.According to the requirement of the required pressure tracking speed of actual conditions,, and need not change whole second damper 12 as long as just can satisfy the demand of pressure tracking speed easily through changing controlling device 38.The pressure tracking speed of industry spot all needs back and forth repetition test to confirm under a lot of situation, and the present invention can simplify debug process through changing controlling device 38, has the advantage that significantly improves operating efficiency, is easy to safeguard.

The present invention then can realize through the two ends face area difference that makes spool 1 if realize the pressure tracking of different pressures.For example; Can the structure of pressure tracking valve be changed into as shown in Figure 4; One end of spool 1 made stepped to make the face area of spool 1 this end be the several times of the other end to form convex shoulder 44; The pressure ratio of the first control cavity volume 23 and the second control cavity volume 20 promptly can be calculated according to the face area ratio at the two ends of spool 1, and promptly can realize the pressure tracking of different pressures when in hydraulic system, using this moment.

Claims

1. pressure tracking valve; It is characterized in that: it comprises valve pocket (4) and places spool (1), first damper (2), second damper (12) and the screw plug (3) in the valve pocket (4) that second damper (12) and screw plug (3) form scyewed joint at two ends and this valve pocket (4) of valve pocket (4) respectively; Spool (1) is positioned between second damper (12) and the screw plug (3) and with valve pocket (4) formation and is slidingly matched; Spool is provided with blind hole in (1); This blind hole and screw plug (3) are relative, and first damper (2) makes between the damper of winning (2) and the screw plug (3) formation first control cavity volume (23) and formation work cavity volume (13) in the blind hole of spool (1) in the ingress of this blind hole with spool (1) scyewed joint; Form the second control cavity volume (20) between second damper (12) and the spool (1); First damper (2) is provided with first damping hole (28) that is communicated with the first control cavity volume (23) and work cavity volume (13) respectively, and second damper (12) is provided with second damping hole (29) that is communicated with the second control cavity volume (20); Bottom direction from first damping hole (28) to blind hole on the wall of the work cavity volume (13) of spool (1) is provided with first actuator port (31) and first filler opening (32) successively; Correspondingly be provided with second actuator port (26) and second filler opening (27) on the wall of valve pocket (4) successively; First actuator port (31) and second actuator port (26) are communicated with, and first filler opening (32) is adjacent with second filler opening (27).

2. pressure tracking valve according to claim 1; It is characterized in that: the wall of the work cavity volume (13) of said spool (1) is provided with first return opening (30); Correspondingly be provided with second return opening (25) on the wall of valve pocket (4); First return opening (30) is adjacent with second return opening (25), and said first actuator port (31) is positioned between first return opening (30) and first filler opening (32), and said second actuator port (26) is positioned between second return opening (25) and second filler opening (27).

3. pressure tracking valve according to claim 1; It is characterized in that: along the circumferential direction be provided with spaced work circular groove (34) and oil-feed circular groove (35) on the inwall of said valve pocket (4) respectively; Said work circular groove (34) is communicated with second actuator port (26), and oil-feed circular groove (35) is communicated with second filler opening (27).

4. pressure tracking valve according to claim 2; It is characterized in that: along the circumferential direction be provided with spaced oil return circular groove (33), work circular groove (34) and oil-feed circular groove (35) on the inwall of said valve pocket (4) respectively; Said oil return circular groove (33) is communicated with second return opening (25); Work circular groove (34) is communicated with second actuator port (26), and oil-feed circular groove (35) is communicated with second filler opening (27).

5. pressure tracking valve according to claim 1; It is characterized in that: said screw plug (3) has first counterbore (36) at its end relative with first damper (2), and said second damper (12) has second counterbore (37) at its end relative with spool (1).

6. pressure tracking valve according to claim 1; It is characterized in that: in second damping hole (29) of said second damper (12), be provided with controlling device (38); This controlling device (38) forms screw-thread fit with second damping hole (29), and the inside of said controlling device (38) is provided with the 3rd damping hole (39).