CN202851494U - Pilot-operated type overflow valve - Google Patents

Pilot-operated type overflow valve Download PDF

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Publication number
CN202851494U
CN202851494U CN 201220503263 CN201220503263U CN202851494U CN 202851494 U CN202851494 U CN 202851494U CN 201220503263 CN201220503263 CN 201220503263 CN 201220503263 U CN201220503263 U CN 201220503263U CN 202851494 U CN202851494 U CN 202851494U
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CN
China
Prior art keywords
valve
pilot
guide
pressure
spring seat
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Expired - Fee Related
Application number
CN 201220503263
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Chinese (zh)
Inventor
刘桓龙
王国志
洪威
吴文海
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Southwest Jiaotong University
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Southwest Jiaotong University
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Priority to CN 201220503263 priority Critical patent/CN202851494U/en
Application granted granted Critical
Publication of CN202851494U publication Critical patent/CN202851494U/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

The utility model belongs to the technical field of hydraulic components. The difference between a pilot-operated type overflow valve and a general pilot-operated type overflow valve is that a pressure-regulating spring seat 13 can move along the axial direction, and pressure of a pilot-operated valve cavity under the function of a pilot-operated cavity overflow valve 22 is controlled in a small constant value. When certain flow passes through an overflow valve, a pilot-operated valve is opened and overflows under the low pressure, one part of pilot-operated flow passes through the pilot-operated cavity overflow valve 22 and an aerial drainage damping hole 21 to flow back outside an oil tank, the other part of the pilot-operated flow flows into a compression cavity 18 through a duct 17, the movable spring seat 13 is pushed to compress an pressure-regulating spring, and pressure of opening the pilot-operated valve is increased. Due to the fact that movement of the spring seat needs a certain time, a rising rate of system pressure is reduced, and therefore dynamic pressure overshoot of the overflow valve is removed effectively. The pilot-operated type overflow valve which is good in static performance and capable of achieving dynamic stress-free overshoot is achieved. The pilot-operated type overflow valve is mainly applied to a hydraulic system which needs the dynamic stress-free overshoot.

Description

Pilot operated compound relief valve
Technical field
The utility model belongs to technical field of hydraulic elements, is specifically related to a kind of pilot operated compound relief valve.
Background technique
Relief valve is very important element in the hydraulic system, and it makes the pressure of system keep constant or prevent system overload mainly by overflow.Common relief valve is because spool needs the regular hour from being closed to open, and during this, system pressure rises and surpasses setting pressure, build-up of pressure overshoot.The rising of system pressure is faster, and the pressure overshoot amount is just larger, and pressure overshoot causes the leakage at pipe joint place and the damage of component easily, affects the dynamic performance of system; For common relief valve, there is larger steady-state fluid force in its main valve, has increased the override pressure of relief valve, affects the static properties of valve.
The model utility content
There is larger dynamic pressure overshoot in order to overcome existing relief valve, affect dynamic performance and part working life, with the excessive deficiency that causes the reduction of valve keying property of main valve plug steady-state fluid force, the utility model provides a kind of pilot operated compound relief valve, this relief valve can not only realize reducing rate of pressure rise, eliminate dynamic pressure overshoot, can also compensate the steady-state fluid force of main valve plug, improve the relief valve static and dynamic performance.
The technological scheme that solves the problems of the technologies described above employing is: a kind of pilot operated compound relief valve, it comprises main valve body, main valve plug, valve gap, the top of main valve body is provided with valve gap, valve gap vertically be provided with guide's valve pocket, be provided with guide's valve seat and guide's spool in the valve pocket, guide's spool is furnished with pressure adjusting spring and spring seat, have adjustable lever and the spring seat Spielpassung of inside groove, and fix by end cap and gland nut, guide's valve pocket has the earial drainage damping hole that connects fuel tank, and guide's valve pocket communicates with oil outlet by relief valve, and the pilot valve ante-chamber is communicated with fuel tank by the remote control mouth, main valve plug is cone valve, and it is provided with bead near the filler opening place.
Movable spring seat is connected with the valve gap slipper seal, and the left end of movable spring seat is tube-in-tube structure, and pressure adjusting spring one end places in the sleeve.
Have the duct that is communicated with guide's valve pocket and compression chamber on the movable spring seat, the area of contact of itself and compression chamber greater than with the area of contact of guide's valve pocket.
Adjustable lever has inside groove, and movable spring seat right-hand member projection and groove are slidingly connected.
Movable spring seat and valve gap and adjustable lever are slidingly connected, its left end is tube-in-tube structure, pressure adjusting spring one end is fixed on the inside, the seal ring motive sealing of sleeve and valve gap, guide's valve pocket part is divided into compression chamber, compression chamber fluid active area is greater than guide's valve pocket fluid active area, have the duct in the movable spring seat and be communicated with this two chambeies, adjustable lever has inside groove, defining movable spring seat moves within it, guide's valve pocket spill port is provided with first guide cavity relief valve in the road, the valve gap inwall has the earial drainage damping hole, is communicated with guide's valve pocket and return line, and the valve gap right-hand member seals with end cap, and compress with gland nut, main valve plug is being provided with bead near the filler opening place.When by certain flow, relief valve will be opened overflow first under initial pressure, and the spillway discharge major part flows back to fuel tank by main valve plug, and sub-fraction enters pilot stage by main damping hole.Flow by main valve is because the effect of main valve plug bead, its direction that flows out main valve plug substantially with poppet shaft to vertical, be that the fluid momentum is zero at axial direction substantially, because import fluid speed is very low, momentum is very little, therefore after adding the bead structure, fluid changes very little by momentum before and after the main valve plug, the steady-state fluid force that main valve plug is subject to greatly reduces with respect to common poppet valve core, realized the steady-state fluid force compensation, pilot flow is communicated with by the damping damping hole with the main valve epicoele, is used for increasing the main valve plug kinetic damping, reduces vibration and noise.Pilot flow will be divided into three the tunnel after entering guide's valve pocket by guide's spool, the first guide cavity relief valve of leading up to flows back to fuel tank, the earial drainage damping hole of leading up to flows back to fuel tank, another road passing hole channel flows to compression chamber from the pilot valve chamber, because the fluid active area of compression chamber is greater than guide's valve pocket fluid active area, and its pressure is no better than the pilot valve cavity pressure, movable spring seat will be promoted the compression pressure adjusting spring vertically, increase the cracking pressure of pilot valve, thereby increase relief valve pressure.The inside groove of adjustable lever defines the displacement amount of movable spring seat, and namely the decrement of pressure adjusting spring so the amount that the pilot valve cracking pressure increases is certain, therefore as long as determine the initial position of adjustable lever, just can be determined the working pressure of relief valve.The fluid uninterrupted that passing hole channel enters compression chamber has determined the speed that movable spring seat moves, namely determined the speed that guide's cracking pressure increases, because the throttling action in duct is very little, the pressure difference of guide's valve pocket and compression chamber is always consistent, and the fluid uninterrupted that enters compression chamber is substantially constant.Therefore, as long as design fluid active area poor in two chambeies, can reduce the rate travel of spring seat, the pilot pressure climbing speed realizes that relief valve is without pressure overshoot; When movable spring seat moves to adjustable lever inside groove high order end, to remain under pressure this invariant position, relief valve reaches working pressure, the before guide cavity relief valve of guide's fluid and earial drainage damping hole flow back to fuel tank, when the relief valve inlet pressure drops to suddenly zero, main valve and pilot valve are closed immediately, elder generation's guide cavity and compression chamber fluid will flow back to fuel tank by the earial drainage damping hole, movable spring seat will move to the low order end of adjustable lever inside groove under the compression force of pressure adjusting spring, realize resetting.
The utility model beneficial effect compared with prior art is:
Can effectively eliminate the steady-state fluid force of the dynamic pressure hyperharmonic main valve plug of relief valve, improve static and dynamic performance.Alternative general relief valve is used for commutating frequently oil hydraulic circuit, reduces the infringement to hydraulic element such as pump and motor that hydraulic shock brings, and improves working life etc.
Below in conjunction with drawings and Examples the utility model is further specified.
Description of drawings
Fig. 1 is structural representation of the present utility model.
Fig. 2 is A section enlarged view among the utility model Fig. 1.
Embodiment
Fig. 1, Fig. 2 illustrates, a kind of embodiment of the present utility model is a kind of pilot operated compound relief valve, comprise main valve body 1, main valve plug 4, valve gap 9, the top of main valve body 1 is provided with valve gap 9, valve gap 9 vertically be provided with guide's valve pocket 20, be provided with guide's valve seat 11 and guide's spool 12 in the valve pocket 20, guide's spool 12 is furnished with pressure adjusting spring 19 and spring seat 13, have the adjustable lever 16 and spring seat 13 Spielpassung of inside groove, and fixing by end cap 14 and gland nut 15, guide's valve pocket 20 has the earial drainage damping hole 21 that connects fuel tank, guide's valve pocket 20 communicates with oil outlet 2 by relief valve 22, pilot valve ante-chamber 10 is communicated with fuel tank by remote control mouth 6, and main valve plug 4 is cone valve, and it is provided with bead 23 near filler opening 3 places.
Movable spring seat 13 is connected with valve gap 9 slipper seals, and the left end of movable spring seat 13 is tube-in-tube structure, and pressure adjusting spring 19 1 ends place in the sleeve.
13 have the duct 17 that is communicated with guide's valve pocket 20 and compression chamber 18 on the movable spring seat, the area of contact of itself and compression chamber greater than with the area of contact of guide's valve pocket.
Adjustable lever 16 has inside groove, and movable spring seat 13 right-hand member projections and groove are slidingly connected.
Movable spring seat 13 is slidingly connected with valve gap 9 and adjustable lever 16, its left end is tube-in-tube structure, pressure adjusting spring 19 1 ends are fixed on the inside, sleeve and valve gap 9 seal ring motive sealing, guide's valve pocket 20 parts are divided into compression chamber 18, compression chamber fluid active area is greater than guide's valve pocket fluid active area, have duct 17 in the movable spring seat 13 and be communicated with this two chambeies, have inside groove in the adjustable lever 16, defining movable spring seat moves within it, guide's valve pocket is provided with first guide cavity relief valve 22 in the 20 spill port roads, the valve gap inwall has earial drainage damping hole 21, is communicated with guide's valve pocket 20 and return line, and valve gap 9 right-hand members seal with end cap 14, and compress with gland nut 15, main valve plug 4 is being provided with bead 23 near filler opening 3 places.When relief valve passes through certain flow, because removable valve spring retainer 13 is in the inside groove low order end position of adjustable lever 16 when initial, the pilot valve cracking pressure is low, relief valve will be opened first overflow under initial pressure, the spillway discharge major part flows back to fuel tank by main valve plug 4 to oil outlet 2, and sub-fraction enters pilot stage by main damping hole 5.Flow by main valve is because the effect of main valve plug bead 23, its direction that flows out main valve plug is basic axially vertical with main valve plug, be that the fluid momentum is zero at axial direction substantially, because filler opening fluid speed is very low, momentum is very little, therefore after adding bead 23 structures, fluid changes very little by momentum before and after the main valve plug, being provided with the steady-state fluid force that spring 7 main valve plugs are subject to greatly reduces with respect to common spool, realized the steady-state fluid force compensation, pilot flow is communicated with by damping damping hole 8 with the main valve epicoele, is used for increasing the main valve plug kinetic damping, reduces vibration and noise.After pilot flow flows into pilot valve ante-chamber 10, to be divided into three the tunnel after entering guide's valve pocket by guide's spool 12, the first guide cavity relief valve 22 of leading up to flows back to fuel tank, the earial drainage damping hole 21 of leading up to flows back to fuel tank, another road passing hole channel 17, flow to compression chamber 18 from pilot valve chamber 20, because the fluid active area of compression chamber 18 is greater than guide's valve pocket 20 fluid active areas, and its pressure is no better than guide's valve pocket 20 pressure, so movable spring seat 13 will be promoted compression pressure adjusting spring 19 vertically, increase the cracking pressure of pilot valve, thereby increased relief valve pressure.The inside groove of adjustable lever defines the displacement amount of movable spring seat 13, i.e. the decrement of pressure adjusting spring 19.So the amount that the pilot valve cracking pressure increases is certain, therefore as long as determine the initial position of adjustable lever 16, just can determine the working pressure of relief valve.The fluid uninterrupted that passing hole channel 17 enters compression chamber has determined the speed that movable spring seat 13 moves, namely determined the speed that guide's cracking pressure increases, because the throttling action in duct 17 is very little, the pressure difference of guide's valve pocket 20 and compression chamber 18 is always consistent, and the uninterrupted that namely flows into compression chamber 18 is substantially constant.Therefore, as long as design fluid active area poor in two chambeies, can reduce the rate travel of spring seat 13, the pilot pressure climbing speed realizes that relief valve is without pressure overshoot; When movable spring seat 13 moves to adjustable lever inside groove high order end, to remain under pressure this invariant position, relief valve reaches working pressure, the before guide cavity relief valve 22 of guide's fluid and earial drainage damping hole 21 flow back to fuel tank, when the relief valve inlet pressure drops to suddenly zero, main valve and pilot valve are closed immediately, elder generation's guide cavity and compression chamber fluid will flow back to fuel tank by earial drainage damping hole 22, movable spring seat 13 will move to the low order end of adjustable lever 16 inside grooves under the compression force of pressure adjusting spring 19, realize resetting.When remote control mouth 6 is communicated with fuel tank, can realize system unloaded.

Claims (4)

1. pilot operated compound relief valve, it comprises main valve body (1), main valve plug (4), valve gap (9), it is characterized in that: the top of main valve body (1) is provided with valve gap (9), valve gap (9) vertically be provided with guide's valve pocket (20), be provided with guide's valve seat (11) and guide's spool (12) in the valve pocket (20), guide's spool (12) is furnished with pressure adjusting spring (19) and spring seat (13), have the adjustable lever (16) and spring seat (13) Spielpassung of inside groove, and fixing by end cap (14) and gland nut (15), guide's valve pocket (20) has the earial drainage damping hole (21) that connects fuel tank, guide's valve pocket (20) communicates with oil outlet (2) by relief valve (22), pilot valve ante-chamber (10) is communicated with fuel tank by remote control mouth (6), main valve plug (4) is cone valve, and it locates to be provided with bead near filler opening (3).
2. pilot operated compound relief valve according to claim 1, it is characterized in that: movable spring seat (13) is connected with valve gap (9) slipper seal, the left end of movable spring seat (13) is tube-in-tube structure, and pressure adjusting spring (19) one ends place in the sleeve.
3. pilot operated compound relief valve according to claim 1, it is characterized in that: (13) have the duct (17) that is communicated with guide's valve pocket (20) and compression chamber (18) on the movable spring seat, the area of contact of itself and compression chamber greater than with the area of contact of guide's valve pocket.
4. pilot operated compound relief valve according to claim 1, it is characterized in that: adjustable lever (16) has inside groove, and movable spring seat (13) right-hand member projection and groove are slidingly connected.
CN 201220503263 2012-09-27 2012-09-27 Pilot-operated type overflow valve Expired - Fee Related CN202851494U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201220503263 CN202851494U (en) 2012-09-27 2012-09-27 Pilot-operated type overflow valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201220503263 CN202851494U (en) 2012-09-27 2012-09-27 Pilot-operated type overflow valve

Publications (1)

Publication Number Publication Date
CN202851494U true CN202851494U (en) 2013-04-03

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CN 201220503263 Expired - Fee Related CN202851494U (en) 2012-09-27 2012-09-27 Pilot-operated type overflow valve

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104633233A (en) * 2015-02-11 2015-05-20 华侨大学 Overflow valve with magneto-rheological pilot valve
CN104776255A (en) * 2015-03-30 2015-07-15 苏州固基电子科技有限公司 Pressure valve
CN106224606A (en) * 2016-08-11 2016-12-14 张广 A kind of guide type sequence valve based on magnetic rheology effect
CN106438546A (en) * 2016-10-20 2017-02-22 华侨大学 Stable-pressure pilot overflow valve
CN110985729A (en) * 2020-01-08 2020-04-10 兰州理工大学 Ultrahigh pressure overflow valve

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104633233A (en) * 2015-02-11 2015-05-20 华侨大学 Overflow valve with magneto-rheological pilot valve
CN104776255A (en) * 2015-03-30 2015-07-15 苏州固基电子科技有限公司 Pressure valve
CN106224606A (en) * 2016-08-11 2016-12-14 张广 A kind of guide type sequence valve based on magnetic rheology effect
CN106438546A (en) * 2016-10-20 2017-02-22 华侨大学 Stable-pressure pilot overflow valve
CN106438546B (en) * 2016-10-20 2018-07-20 华侨大学 A kind of voltage stabilizing pilot operated compound relief valve
CN110985729A (en) * 2020-01-08 2020-04-10 兰州理工大学 Ultrahigh pressure overflow valve

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C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20130403

Termination date: 20150927

EXPY Termination of patent right or utility model