CN203627374U - Novel pressure-relief type proportioning pilot valve - Google Patents
Novel pressure-relief type proportioning pilot valve Download PDFInfo
- Publication number
- CN203627374U CN203627374U CN201320832059.8U CN201320832059U CN203627374U CN 203627374 U CN203627374 U CN 203627374U CN 201320832059 U CN201320832059 U CN 201320832059U CN 203627374 U CN203627374 U CN 203627374U
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- valve body
- spool
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- oil
- pressure
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- 230000007246 mechanism Effects 0.000 claims abstract description 11
- 238000007789 sealing Methods 0.000 claims abstract description 9
- 239000011148 porous material Substances 0.000 claims description 4
- 230000003139 buffering effect Effects 0.000 abstract 2
- 238000000034 method Methods 0.000 description 9
- 230000006837 decompression Effects 0.000 description 8
- 230000008569 process Effects 0.000 description 6
- 238000013016 damping Methods 0.000 description 5
- 239000012530 fluid Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 210000000664 rectum Anatomy 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
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Abstract
The utility model discloses a novel pressure-relief type proportioning pilot valve. The novel pressure-relief type proportioning pilot valve comprises an operation handle mechanism, a valve body set, a valve element assembly and a secondary pressure-relief mechanism. The valve body set is divided into an upper valve body and a lower valve body which are connected through two bolts, a sealing ring is arranged between the upper valve body and the lower valve body for sealing, the upper valve body is provided with an oil returning cavity, the lower valve body is provided with an oil inlet cavity, an oil duct of the oil inlet cavity, a valve element hole, a work cavity, an oil duct of the work cavity, an oil returning duct and a buffering cavity separated by a valve element, the valve element hole is respectively communicated with the oil inlet cavity, the work cavity and the oil returning cavity, the valve element is of a two-order concentric structure, the diameter of an upper protruding shoulder of the valve element is larger than the diameter of a lower protruding shoulder, U-shaped throttling grooves are formed in the upper protruding shoulder and the lower protruding shoulder of the valve element respectively, a small throttling hole is formed in the center of the valve element, the buffering cavity is communicated with a spring cavity of the valve element, namely the oil returning cavity through the thin, long and small throttling hole, and the secondary pressure-relief mechanism is arranged in a contact. The novel pressure-relief type proportioning pilot valve has the advantages of being high in flow capacity, low in rigidity of a pressure-relief spring, long in service life, stable in pressure, good in micro control proportion performance.
Description
Technical field
The utility model belongs to pilot valve, specifically a kind of Novel pressure-reducing formula proportional pilot valve.
Background technique
Handle mechanically at running mechanism or high pressure, high-volume hydraulic, in order to improve the manoeuvring performance of machine, alleviate manipulator's labor intensity, main control valve generally adopts pilot control.All adopt direct-acting type decompression pilot valve for the widely used pilot valve of engineering machinery at present, as the DJS/DXS pilot valve of the 4TH6 series of BOSCH-REXROTH, Ka Te.The type pilot valve belongs to direct-acting type; Spool latus rectum is little, and through-current capability is poor; Relief spring is single spring, one-level pressure reduction structure, the rigidity of relief spring is larger, the high risk zone of relief spring in compressive strain when decompression finishes, spring force can reduce greatly in use for some time, thereby shortens between reduced-pressure zone, do not mate with the micro-control performance of multi-way valve, cause multi-way valve hydraulic system pressure to impact, mate with variable system multi-way valve especially, directly affect the energy-saving effect of whole hydraulic system.
Model utility content
The purpose of this utility model is the deficiency existing for prior art, and a kind of Novel pressure-reducing formula proportional pilot valve is provided, and has through-current capability strong, and relief spring rigidity is little, the life-span is long, pressure stability, the well behaved feature of micro-control ratio.
For achieving the above object, the utility model by the following technical solutions:
A kind of Novel pressure-reducing formula proportional pilot valve, formed by Handleset, upper valve body, lower valve body and mangetic core assembly, it is characterized in that: two bolts of described upper valve body and lower valve body are connected, centre seals with seal ring, described upper valve body is provided with oil back chamber, the buffer cavity that described lower valve body is provided with oil suction chamber, oil duct, spool bore, active chamber, back oil road and is separated by spool, spool bore is communicated with oil suction chamber, active chamber and oil back chamber respectively.
Described a kind of Novel pressure-reducing formula proportional pilot valve, is characterized in that: described mangetic core assembly is connected and composed by pressure regulation pad, spool, Returnning spring, relief spring, spring seat, motive sealing lid, contact.
Described a kind of Novel pressure-reducing formula proportional pilot valve, is characterized in that: described spool is second order concentric structure, on it, convex shoulder diameter is greater than lower convex shoulder, respectively has U bend chute group and little U bend chute group on the upper and lower convex shoulder of spool.
Described a kind of Novel pressure-reducing formula proportional pilot valve, is characterized in that: described contact is provided with second depressurized mechanism, is made up of second depressurized spring seat and second depressurized spring, and spool upper end, through spring seat, is connected with second depressurized spring seat.
Described a kind of Novel pressure-reducing formula proportional pilot valve, is characterized in that: the center of described spool is provided with throttling pore, buffer cavity communicates with oil back chamber by throttling pore.
Valve body component of the present utility model is upper valve body and lower valve body, and with two bolts connections, centre seals with seal ring; Its order is in order to reduce valve body casting difficulty and to guarantee that oil duct is clean.Described upper valve body is provided with oil back chamber, adopts aluminum alloy material; Its object reduces the weight of whole valve.
Compared with the prior art, the utility model passes through technique scheme, beneficial effect is: the spool of second order concentric structure, pressure feedback annular bearing face is the poor of upper and lower two convex shoulder areas, compare with the pilot valve that existing spool is mono-cylindrical, under same pilot pressure, the rigidity Design value of relief spring can reduce; Secondly, because the center of spool is provided with damping hole, increase the damping constant of valve, with the dynamic process of this regulating spool, reduced hydraulic shock, improved the stationarity of handling; In addition, the second depressurized mechanism in contact, can be multiple directional control valve and offers in the fine motion later stage active force that stem movement velocity variations is larger, guarantees that valve rod commutates rapidly, improves operating efficiency; Further, because the upper and lower convex shoulder of spool all has the throttling groove of non-all-round opening, its area gradient and valve opening are linear ratio relation, can reduce the variation of valve port flow coefficient, improve the stability of valve.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is pressure characteristic figure of the present utility model;
In Fig. 1: 1. Handleset, 2. connecting rod, 3. platen, 4. universal joint, 5. pressing plate, 6. upper valve body, 7. oil back chamber, 8. descends valve body, 9. oil suction chamber, 10. buffer cavity, 11. little U bend chute groups, 12. times convex shoulders, 13. active chambers, convex shoulder on 14., U bend chute group on 15., 16. pressure regulation pads, 17. spool damping orifices, 18. spools, 19. Returnning springs, 20. relief springs, 21. spring seats, 22. motive sealing lids, 23. second depressurized spring seats, 24. second depressurized springs, 25. contacts, 26. little dust-proof cover, 27. large dust-proof cover.
Embodiment
Below in conjunction with accompanying drawing, the utility model is elaborated.
In Fig. 1, Joystick mechanism comprises that Handleset 1, connecting rod 2, platen 3, universal joint 4, pressing plate 5, little dust-proof cover 26 and large dust-proof cover 27 form; Described valve body is made up of upper valve body 6 and lower valve body 8, connects and adopts O type circle sealing with two bolts, and upper valve body 6 is provided with oil back chamber 7, and lower valve body 8 is provided with oil suction chamber 9, buffer cavity 10, and active chamber 13, is communicated with by spool bore; Described spool mechanism is connected and composed by pressure regulation pad 16, spool 18, Returnning spring 19, relief spring 20, spring seat 21, motive sealing lid 22, contact 25; Contact 25 of living in is provided with second depressurized mechanism, is made up of second depressurized spring seat 23 and second depressurized spring 24.
Further illustrate: Handleset 1 is fixed on one end of universal joint 4 by connecting rod 2 use nuts, platen 3 and little dust-proof cover 26 upper ends are secured in a press simultaneously, universal joint 4 the other ends are connected with upper valve body 6, and clamping platen 5, pressing plate 5 fixing little dust-proof cover 26 lower ends; Platen 3 can be around universal joint 4 center rotatings, and contact with contact 24; Between contact 24 and motive sealing lid 22, be provided with C1 type Sealing, contact 24 lower end linking springs seats 21; Spool 18 upper ends are through spring seat 21, be connected with second depressurized spring seat 23, under spool, convex shoulder 12 diameters are less than convex shoulder 14 diameters on spool, both are that second order is concentric, under spool, convex shoulder 12 is provided with 4 little U bend chutes 11, and on spool, convex shoulder 14 is provided with 4 upper U bend chute groups 15, and position is corresponding with little U bend chute 11, two gears are provided with several compensating grooves, and center spool is provided with spool damping orifice 17; Relief spring 20 is arranged between spring seat 21 and spool 18; Returnning spring 19 one end are arranged on spring seat 21, and the other end is arranged in the fixed groove of lower valve body 8.
Working principle of the present utility model and implementation procedure are: when the neutral position, under spool, convex shoulder 12 separates oil suction chamber 9 and active chamber 13, the fluid of active chamber 13 enters oil back chamber 7 through the upper U bend chute group 15 on convex shoulder 14 on spool, and now the pressure of active chamber 13 is zero, Joystick assembly 1, platen 3 is around universal joint 4 center rotatings, promoting contact 24 moves downward, promote spring seat 21, make relief spring 20 stressed, promoting spool 18 moves down, upper U bend chute group 15 on spool on convex shoulder 14 is closed gradually, then under spool, the little U bend chute 11 on convex shoulder 12 is opened gradually, the fluid of oil suction chamber 9 enters active chamber 13 and forms certain pressure, because 12 diameters of convex shoulder under spool are less than convex shoulder 14 diameters on spool, be convex shoulder sectional area S2 on convex shoulder sectional area S1< spool under spool, according to formula F=PS, can obtain F1<F2, fluid produces power upwards to spool 18, force spool to overcome the power of relief spring 20, move upward, turn down gradually the opening of oil suction chamber 9 and active chamber 13, until fluid is to the upwards downward active force of active force and relief spring 20 balance each other (now active chamber 13 with oil back chamber 7 still in closed condition) of spool 18, thereby form pressure and the proportional relation of spool 18 downward displacement amount of active chamber 13, in the time that the external force of promotion contact 24 is cancelled, spool 18 upwards moves reset in the effect of hydraulic coupling and Returnning spring 19 power, and on spool, convex shoulder throttling groove group 15 is opened, and active chamber 13 communicates with oil back chamber 7, and fluid release of pressure is zero.Also have, decompression process in earlier stage, there is certain interval in second depressurized spring 24 one end and contact 25, so only have 20 decompressions of relief spring, working hole pressure variable gradient is milder, arrive the decompression process later stage, second depressurized spring 24 one end contact with contact 25, another section contacts with spool 18 upper-end surfaces by second depressurized spring seat 23, relief spring 20 and 24 actings in conjunction of second depressurized spring realize decompression ratio process like this, working hole pressure variable gradient is steeper, whole decompression process working hole pressure and spool stroke relation form a broken line (shown in Fig. 2), in decompression process, filler opening oil pressure causes spool 18 dithers due to unstable, forms damper mechanism therefore spool damping orifice 17 is set with buffer cavity 10, hinders spool 18 dithers, makes active chamber 13 delivery pressures more stable.
The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model, all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within being all included in protection domain of the present utility model.
Claims (5)
1. a Novel pressure-reducing formula proportional pilot valve, formed by Handleset (1), upper valve body (6), lower valve body (8) and mangetic core assembly, it is characterized in that: two bolts of described upper valve body (6) and lower valve body (8) are connected, centre seals with seal ring, described upper valve body (6) is provided with oil back chamber (7), the buffer cavity (10) that described lower valve body (8) is provided with oil suction chamber (9), oil duct, spool bore, active chamber (13), back oil road and is separated by spool, spool bore is communicated with oil suction chamber (9), active chamber (13) and oil back chamber (7) respectively.
2. a kind of Novel pressure-reducing formula proportional pilot valve as claimed in claim 1, is characterized in that: described mangetic core assembly is connected and composed by pressure regulation pad (16), spool (18), Returnning spring (19), relief spring (20), spring seat (21), motive sealing lid (22), contact (25).
3. a kind of Novel pressure-reducing formula proportional pilot valve as claimed in claim 2, it is characterized in that: described spool (18) is second order concentric structure, convex shoulder on it (14) diameter is greater than lower convex shoulder (12), respectively has U bend chute group (15) and little U bend chute group (11) on the upper and lower convex shoulder of spool.
4. a kind of Novel pressure-reducing formula proportional pilot valve as claimed in claim 2, it is characterized in that: described contact (25) is provided with second depressurized mechanism, formed by second depressurized spring seat (23) and second depressurized spring (24), spool (18) upper end, through spring seat (21), is connected with second depressurized spring seat (23).
5. a kind of Novel pressure-reducing formula proportional pilot valve as claimed in claim 2, is characterized in that: the center of described spool (18) is provided with throttling pore, and buffer cavity communicates with oil back chamber (7) by throttling pore.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320832059.8U CN203627374U (en) | 2013-12-17 | 2013-12-17 | Novel pressure-relief type proportioning pilot valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320832059.8U CN203627374U (en) | 2013-12-17 | 2013-12-17 | Novel pressure-relief type proportioning pilot valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203627374U true CN203627374U (en) | 2014-06-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320832059.8U Expired - Lifetime CN203627374U (en) | 2013-12-17 | 2013-12-17 | Novel pressure-relief type proportioning pilot valve |
Country Status (1)
| Country | Link |
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| CN (1) | CN203627374U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104179744A (en) * | 2014-08-06 | 2014-12-03 | 浙江海宏液压科技股份有限公司 | Hydraulic parking valve |
-
2013
- 2013-12-17 CN CN201320832059.8U patent/CN203627374U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104179744A (en) * | 2014-08-06 | 2014-12-03 | 浙江海宏液压科技股份有限公司 | Hydraulic parking valve |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140604 |