CN104033437B - A kind of active proportional relief valve - Google Patents
A kind of active proportional relief valve Download PDFInfo
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- CN104033437B CN104033437B CN201410224417.6A CN201410224417A CN104033437B CN 104033437 B CN104033437 B CN 104033437B CN 201410224417 A CN201410224417 A CN 201410224417A CN 104033437 B CN104033437 B CN 104033437B
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Abstract
A kind of active proportional relief valve of disclosure, including valve body, proportional pressure control valve and reversal valve, has the first oil duct, the second oil duct, the 3rd oil duct and the 4th oil duct in valve body；One end of first oil duct connects with the oil-out of proportional pressure control valve, and the other end of the first oil duct connects with external fuel tank；One end of second oil duct connects with the oil-in of proportional pressure control valve, and the other end of the second oil duct is provided with flow control valve, and the import of described flow control valve connects with external control oil sources；One end of 3rd oil duct connects with the second oil duct, and the other end of the 3rd oil duct connects with one of them hydraulic fluid port of reversal valve；One end of 4th oil duct connects with another hydraulic fluid port of reversal valve, the pressure release hydraulic fluid port that the other end is active proportional relief valve of the 4th oil duct.The present invention has the advantage such as simple in construction, processing simplicity, good, the reliable working performance of consistency of performance.
Description
Technical field
The present invention relates to a kind of hydraulic valve, particularly relate to a kind of relief valve for completing decompression function in hydraulic system.
Background technology
Hydraulic system is when pressure maintaining period terminates, typically require use pressure release loop and carry out the huge energy that slow releasing is put aside because of the compressibility of the elastic deformations such as frame, hydraulic cylinder and pipeline and fluid, prevent from discharging suddenly because of energy cause hydraulic shock, vibrate breaking of even pipeline and valve, pressure release loop is the important safety loop of the main equipments such as hydraulic press, and relief valve is the main hydraulic in pressure release loop.High-voltage ratio relief valve described in Chinese invention patent CN201110288908.3, it is made up of proportional pressure-reducing valve, valve casing, main valve plug, small valve core, the first spring, the second spring, the 3rd spring, the first hydraulic fluid port, the second hydraulic fluid port, valve seat, steel ball, control piston etc..When the first hydraulic fluid port pressure is carried out pressurize, main valve plug is pressed to above valve seat under the active force of the first spring, steel ball is pressed in the aperture portion of ladder perforation of main valve plug under the active force of the second spring simultaneously, the pressure oil of the first hydraulic fluid port the first gap between main valve plug and plug-in mounting valve body, enter in spring cavity, act simultaneously on above steel ball and main valve plug, so time, the aperture portion of the ladder perforation of steel ball and main valve plug, the taper surface of poppet valve core is made to contact cooperation with the import department of the perforation of valve seat, they are all linear sealing No leakage, pressure can be maintained at supertension state, namely block between the first hydraulic fluid port and pressure relief opening.When needs carry out pressure release work, the second hydraulic fluid port passes into pressure oil, and the proportional pressure-reducing valve output pressure size according to the pressure oil in the size adjustment transition passage controlling electric current, the pressure oil in transition passage is applied directly on control piston.When the oil pressure in transition passage, it is enough to overcome the elastic force of the 3rd spring, control piston to left movement, when oil pressure acts on, more than the first spring and the second spring and ultra high pressure, the power produced above steel ball, control small valve core is promoted to be backed down by steel ball, now the pressure oil of the first hydraulic fluid port sequentially passes through the interface channel on the first gap, spring cavity, the first spring base, third space finally flows into pressure relief opening, and the pressure of the first hydraulic fluid port slowly declines.Because the first gap and third space are only small, being approximately in about 0.01mm, now pressure release speed is very mild, will not produce pressure release speed phenomenon quickly during supertension.In use, first foregoing invention patent has the disadvantage in that, aforementioned proportion pressure-relief valve structure is complicated, parts are more, and processing cost is higher, and consistency of performance is poor；Secondly, the pressure relief opening gap less (0.01mm) of aforementioned proportion relief valve is susceptible to the faults such as spool jam.Finally, the above-mentioned hydraulic oil bleeding off the first oil port that is merely by than relief valve valve is to realize pressure release, if the pressure of the first oil port hydraulic oil is lower than desired pressure in pressure leak process, aforementioned proportion relief valve cannot realize the rise of the first pressure relief opening place pressure and regulate, it is impossible to realizes multiple proportional relief valve ratio and synchronizes pressure release.
Summary of the invention
It is an object of the invention to provide the active proportional relief valve of a kind of simple in construction, reliable operation.
For achieving the above object, the technical solution used in the present invention is: the active proportional relief valve of the present invention includes valve body, and also includes proportional pressure control valve and reversal valve, has the first oil duct, the second oil duct, the 3rd oil duct and the 4th oil duct in described valve body；One end of first oil duct connects with the oil-out of proportional pressure control valve, and the other end of the first oil duct connects with external fuel tank；One end of second oil duct connects with the oil-in of proportional pressure control valve, and the other end of the second oil duct is provided with flow control valve, and the import of described flow control valve connects with external control oil sources；One end of 3rd oil duct connects with the second oil duct, and the other end of the 3rd oil duct connects with one of them hydraulic fluid port of described reversal valve；One end of 4th oil duct connects with another hydraulic fluid port of described reversal valve, and the other end of the 4th oil duct is pressure release hydraulic fluid port.
Further, described pressure release hydraulic fluid port connects with outside pressure release control cavity volume.
Further, proportional pressure control valve servo valve of the present invention or proportional throttle valve are replaced.
Further, reversal valve of the present invention is Solenoid ball valve.
Further, flow control valve of the present invention is antivibrator or choke valve.
Compared with existing proportional relief valve, the invention has the beneficial effects as follows: the active proportional relief valve of the present invention only includes the critical pieces such as valve body, proportional pressure control valve, Solenoid ball valve, antivibrator, valve body only needs the simplest mechanical processing techniques such as boring, tapping, and the proportional pressure control valve of the present invention and Solenoid ball valve can direct commercially available matured product, therefore the active proportional relief valve of the present invention has the advantage such as simple in construction, processing simplicity, good, the reliable working performance of consistency of performance.
Accompanying drawing explanation
Fig. 1 is the structural representation of the active proportional relief valve of the present invention；
Fig. 2 is the schematic diagram of the active proportional relief valve of the present invention；
Fig. 3 is the structural representation using the ratio of the active proportional relief valve composition of the present invention to synchronize pressure release hydraulic system in engineering practice；
1. pressure release hydraulic fluid port in figure, 2. input hydraulic fluid port, 3. output oil port, 4. antivibrator, 5. the first oil duct, 6. the second oil duct, 7. proportional pressure control valve, 8,8.1,8.2 active proportional relief valve, 9. valve bodies, 10. the 3rd oil duct, 11. Solenoid ball valves, 12. the 4th oil ducts, 13. overflow valve, 14. hydraulic pumps, 15. pressure transducers, 16. hydraulic cylinder, 17. pressure transducers, 18. hydraulic cylinders.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
As it is shown in figure 1, the active proportional relief valve 8 of the present invention includes valve body 9, proportional pressure control valve 7 and reversal valve 11, in valve body 9, have the first oil duct the 5, second oil duct the 6, the 3rd oil duct 10 and the 4th oil duct 12.Wherein, one end of the first oil duct 5 connects with the oil-out of proportional pressure control valve 7, and the other end of the first oil duct 5 is the output oil port 3 of active proportional relief valve 8, and output oil port 3 connects with external fuel tank.One end of second oil duct 6 connects with the oil-in of proportional pressure control valve 7, and the other end of the second oil duct 6 is provided with flow control valve 4, the import of flow control valve 4 be active proportional relief valve 8 input hydraulic fluid port 2, input hydraulic fluid port 2 connect with external control oil sources.One end of 3rd oil duct 10 connects with the second oil duct 6, and the other end of the 3rd oil duct 10 connects with one of them hydraulic fluid port of reversal valve 11；One end of 4th oil duct 12 connects with another hydraulic fluid port of reversal valve 11, and the other end of the 4th oil duct 12 is the pressure release hydraulic fluid port 1 of active proportional relief valve 8, and pressure release hydraulic fluid port 1 controls cavity volume with outside pressure release and connects.
Proportional pressure control valve in the present invention can use servo valve or proportional throttle valve to replace.
As preferably, the reversal valve of the present invention is Solenoid ball valve.
As preferably, flow control valve can be antivibrator 4 as shown in Figure 1.The thread cartridge of antivibrator 4 is the position of close input hydraulic fluid port 2 in the 3rd oil duct 10.
Flow control valve in the present invention can also be choke valve.
Operation principle and the process of the active proportional relief valve of the present invention are as follows:
When Solenoid ball valve 11 cuts off the oil circuit between the 3rd oil duct 10 and the 4th oil duct 12 of valve body, the active proportional relief valve 8 of the present invention is in pressurize operating mode, the hydraulic oil at pressure release hydraulic fluid port 1 place of active proportional relief valve is reliably sealed, and active proportional relief valve pressure release hydraulic fluid port 1 place pressure remains unchanged.When Solenoid ball valve 11 turns on oil circuit between the 3rd oil duct 10 of valve body and valve body the 4th oil duct 12, the active proportional relief valve 8 of the present invention is in pressure release operating mode, and the input hydraulic fluid port 2 of active proportional relief valve, antivibrator 4, proportional pressure control valve 7 collectively constitute a Type B hydraulic half-bridge with valve body output oil port 3.Wherein, antivibrator 4 is the input liquid resistance of Type B hydraulic half-bridge, the equivalence that proportional pressure control valve 7 is Type B hydraulic half-bridge exports the resistance of variable liquid, between the import exporting to proportional pressure control valve 7 of antivibrator 4, namely oil duct cavity volume is the pressure output control cavity volume of Type B hydraulic half-bridge, the pressure output control cavity volume of Type B hydraulic half-bridge by the 3rd oil duct 10 of valve body, valve body the 4th oil duct 12, conducting Solenoid ball valve 11 connect with the pressure release hydraulic fluid port 1 of valve body.Operation principle according to Type B hydraulic half-bridge, the size controlling electric current changing proportional pressure control valve 7 can control the equivalent aperture size of proportional pressure control valve 7 valve port (i.e. the size of Type B hydraulic half-bridge output liquid resistance), and the output pressure of Type B hydraulic half-bridge thus can be followed the change of the input current of proportional pressure control valve 7 and be changed.
Below in conjunction with Fig. 2, the operation principle of the active proportional relief valve 8 of the present invention is made more specific description.In Fig. 2, pressure release hydraulic fluid port 1 connects with a hydraulic fluid port of Solenoid ball valve 11, the outlet of the another one hydraulic fluid port of Solenoid ball valve 11 and the oil-in of proportional pressure control valve 7 and antivibrator 4, the oil-in of antivibrator 4 connects with the input hydraulic fluid port 2 of active proportional relief valve, and the oil-out of proportional pressure control valve 7 connects with the output oil port 3 of active proportional relief valve.As in figure 2 it is shown, introduce external control oil sources, external control oil sources and antivibrator 4, proportional pressure control valve 7 by the input hydraulic fluid port 2 of active proportional relief valve to form Type B active hydraulic half-bridge.Antivibrator 4, proportional pressure control valve 7 are the resistance of input liquid and the equivalence output liquid resistance of Type B hydraulic half-bridge respectively, by changing the ratio pressure release that the input current of input proportional pressure control valve 7 just can realize the pressure release hydraulic fluid port 1 place hydraulic fluid pressure of active proportional relief valve by Type B hydraulic half-bridge, and when pressure release hydraulic fluid port 1 place hydraulic fluid pressure is lower than desired pressure, it is also possible to by regulating the desired pressure that the hydraulic fluid pressure at 7 pressure release hydraulic fluid port 1 places of proportional pressure control valve rises.Visible, the present invention constitutes an active proportional relief valve by introducing an Isobarically Control oil sources from the input hydraulic fluid port 2 of valve body 9, it is possible to overcome proportional pressure control valve cannot be used directly to the defect in composition pressure release loop because of minimum discharge restriction.
Fig. 3 is the structural representation using the ratio of the active proportional relief valve composition of the present invention to synchronize pressure release hydraulic system in engineering practice.As it is shown on figure 3, the oil-in of overflow valve 13 connects with the input hydraulic fluid port of each active proportional relief valve respectively with the oil-out of hydraulic pump 14 simultaneously, the oil-out of overflow valve 13 connects with external fuel tank.Each active proportional relief valve is configured with a hydraulic cylinder and a pressure transducer.Specifically, as shown in Figure 3, the pressure release hydraulic fluid port of active proportional relief valve 8.1 connects with rodless cavity and the pressure transducer 17 of hydraulic cylinder 18 simultaneously, and the input hydraulic fluid port of active proportional relief valve 8.1 connects with oil-in and hydraulic pump 14 oil-out of overflow valve 13 simultaneously.The pressure release hydraulic fluid port of active proportional relief valve 8.2 then connects with rodless cavity and the pressure transducer 15 of hydraulic cylinder 16 simultaneously, and the input hydraulic fluid port of active proportional relief valve 8.2 connects with the oil-in of overflow valve 13 and the oil-out of hydraulic pump 14 simultaneously.Active proportional relief valve 8.1 all connects with fuel tank with the output oil port of active proportional relief valve 8.2；Hydraulic cylinder 18 all connects with fuel tank with the rod chamber of hydraulic cylinder 16.In hydraulic work system process, hydraulic pump 14 and overflow valve 13 form an Isobarically Control oil sources, and this Isobarically Control oil sources provides constant control pressure to the input hydraulic fluid port of active proportional relief valve 8.1 and 8.2.Hydraulic cylinder 17 and hydraulic cylinder 15 drive a bulk loads (ship reception chamber of such as large scale ship) jointly, before hydraulic cylinder moves downward, terminate packing state enter pressure release state, need the high pressure liquid force feed pressure release in the rodless cavity of hydraulic cylinder 18 and hydraulic cylinder 16, require that hydraulic fluid pressure in the rodless cavity of hydraulic cylinder 18 and hydraulic cylinder 16 carries out synchronizing pressure release (such as carrying out Linear Synchronous pressure release) according to assignment curve, and in pressure leak process, ensure that the pressure divergence of rodless cavity of hydraulic cylinder 18 and hydraulic cylinder 16 is less than 3%.Use the active proportional relief valve of the present invention 8 can realize the synchronization pressure release scheme that sexual valence is higher: the closed-loop control system of the rodless cavity pressure using active proportional relief valve 8.1, active proportional relief valve 8.2, pressure transducer 17 and pressure transducer 15 can respectively constitute hydraulic cylinder 18 and hydraulic cylinder 16.During pressure release, owing to active proportional relief valve carries the inlet communication of the proportional pressure control valve that Solenoid ball valve makes the pressure release hydraulic fluid port of active proportional relief valve and active proportional relief valve carry, by changing the pressure that the Setting signal carrying proportional pressure control valve of active proportional relief valve can regulate to ratio the pressure release oil port hydraulic oil of active proportional relief valve.It was verified that use the ratio of the active proportional relief valve 8 of the present invention to synchronize pressure release scheme can ensure that in pressure leak process that hydraulic cylinder 18 and hydraulic cylinder 16 rodless cavity pressure synchronize pressure release according to assignment curve, and in ratio pressure leak process synchronism deviation less than 3%.
The present invention has a major advantage in that: the active proportional relief valve of (one) present invention only includes the critical pieces such as valve body 8, proportional pressure control valve 7, Solenoid ball valve 11, antivibrator 4, and valve body 9 only needs the simplest mechanical processing techniques such as boring, tapping, therefore, the active proportional relief valve of the present invention is compared with existing proportional relief valve, structure is greatly simplified, and manufacturing processing technic is fairly simple.(2) in the course of the work, the valve port opening of proportional pressure control valve 7, Solenoid ball valve 11 and antivibrator 4 all much larger than 0.01mm, is substantially reduced the probability that spool is blocked, and reliability is higher.(3) present invention realizes the active ratio pressure release at pressure release hydraulic fluid port 1 place by introducing control oil sources at the input hydraulic fluid port 2 of valve body 9, by regulating proportional pressure control valve 7, the hydraulic fluid pressure at pressure release hydraulic fluid port 1 place can be increased to desired pressure when the pressure at pressure relief opening 1 place is lower than desired pressure, it is possible to achieve the ratio of multiple hydraulic pressure cavity volumes synchronizes pressure release.(4) present invention uses proportional pressure control valve 7 and Solenoid ball valve 11 all can the products of direct commercially available maturation, it is ensured that the active proportional relief valve of the present invention has good consistency of performance.Therefore, the active proportional relief valve 8 proposed in the industrial applications present invention advantageously, has good application prospect in cost, reliability, ratio synchronize pressure release etc..
Claims (5)
1. an active proportional relief valve, including valve body (9), it is characterized in that: also include proportional pressure control valve (7) and reversal valve (11), in described valve body (9), have the first oil duct (5), the second oil duct (6), the 3rd oil duct (10) and the 4th oil duct (12)；One end of first oil duct (5) connects with the oil-out of proportional pressure control valve (7), and the other end of the first oil duct (5) connects with external fuel tank；One end of second oil duct (6) connects with the oil-in of proportional pressure control valve, and the other end of the second oil duct (6) is provided with flow control valve (4), and the import of flow control valve (4) connects with external control oil sources；One end of 3rd oil duct (10) connects with the second oil duct (6), and the other end of the 3rd oil duct (10) connects with one of them hydraulic fluid port of described reversal valve (11)；One end of 4th oil duct (10) connects with another hydraulic fluid port of described reversal valve (11), and the other end of the 4th oil duct (10) is pressure release hydraulic fluid port (1).
2. active proportional relief valve according to claim 1, it is characterised in that: described pressure release hydraulic fluid port (1) controls cavity volume with outside pressure release and connects.
3. active proportional relief valve according to claim 1 and 2, it is characterised in that: described proportional pressure control valve servo valve or proportional throttle valve are replaced.
4. active proportional relief valve according to claim 1 and 2, it is characterised in that: described reversal valve is Solenoid ball valve.
5. active proportional relief valve according to claim 1 and 2, it is characterised in that: described flow control valve is antivibrator or choke valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410224417.6A CN104033437B (en) | 2014-05-26 | 2014-05-26 | A kind of active proportional relief valve |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410224417.6A CN104033437B (en) | 2014-05-26 | 2014-05-26 | A kind of active proportional relief valve |
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| CN104033437A CN104033437A (en) | 2014-09-10 |
| CN104033437B true CN104033437B (en) | 2016-06-29 |
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| CN201410224417.6A Active CN104033437B (en) | 2014-05-26 | 2014-05-26 | A kind of active proportional relief valve |
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| CN108561357B (en) * | 2018-01-20 | 2020-11-17 | 义乌市思淇工业设计有限公司 | Plug-in type proportional overflow valve |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200968276Y (en) * | 2006-10-16 | 2007-10-31 | 飞翼集团有限公司 | Valve block integrated module used for concrete delivery pump |
| CN201763715U (en) * | 2010-09-16 | 2011-03-16 | 泸州众大科技液压件有限公司 | Pile-up valve of gallery drilling machine |
| CN103122881A (en) * | 2011-11-18 | 2013-05-29 | 广西柳工机械股份有限公司 | Pilot reducing valve |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2927308B2 (en) * | 1991-02-07 | 1999-07-28 | カヤバ工業株式会社 | Hydraulic control circuit |
| JP2010060057A (en) * | 2008-09-04 | 2010-03-18 | Caterpillar Japan Ltd | Hydraulic control system in working machine |
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- 2014-05-26 CN CN201410224417.6A patent/CN104033437B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200968276Y (en) * | 2006-10-16 | 2007-10-31 | 飞翼集团有限公司 | Valve block integrated module used for concrete delivery pump |
| CN201763715U (en) * | 2010-09-16 | 2011-03-16 | 泸州众大科技液压件有限公司 | Pile-up valve of gallery drilling machine |
| CN103122881A (en) * | 2011-11-18 | 2013-05-29 | 广西柳工机械股份有限公司 | Pilot reducing valve |
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| CN104033437A (en) | 2014-09-10 |
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