CN110725823B - Plug-in type two-stage proportional speed regulating valve based on pressure flying rate detector - Google Patents
Plug-in type two-stage proportional speed regulating valve based on pressure flying rate detector Download PDFInfo
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- CN110725823B CN110725823B CN201910961211.4A CN201910961211A CN110725823B CN 110725823 B CN110725823 B CN 110725823B CN 201910961211 A CN201910961211 A CN 201910961211A CN 110725823 B CN110725823 B CN 110725823B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B2013/002—Modular valves, i.e. consisting of an assembly of interchangeable components
- F15B2013/004—Cartridge valves
Abstract
The invention provides a plug-in type two-stage proportional speed regulating valve based on a pressure fly-up rate detector, which utilizes the pressure fly-up rate detector to detect the inlet pressure or outlet pressure change of a main valve in real time, controls the pressure of a control cavity of the main valve by changing the opening of a valve port of the pressure fly-up rate detector, and reduces the flow overshoot of the main valve. The plug-in type two-stage proportional speed regulating valve based on the pressure fly-up rate detector has the advantages of quickly detecting pressure sudden change, quickly adjusting flow overshoot caused by the pressure sudden change, improving the equal flow characteristic of the proportional speed regulating valve by combining a digital flow compensator and improving the dynamic performance of the proportional speed regulating valve.
Description
Technical Field
The invention belongs to the technical field of electro-hydraulic control valves, and particularly relates to a plug-in type two-stage proportional speed regulating valve based on a pressure fly-lift rate detector.
Background
In an electro-hydraulic control system, an interpolation type two-stage proportional throttle valve is widely applied to motion control of a hydraulic actuating mechanism, and the output flow of the plug-in type two-stage proportional throttle valve is not constant due to the influence of the pressure difference change of a valve port. The displacement-flow feedback type proportional throttle valve is a plug-in two-stage proportional throttle valve, and has the advantages that the flow passing through the main valve and the flow passing through the pilot valve have approximate linear relation, but the output flow is still influenced by the change of the valve port differential pressure. In order to reduce the influence of the valve port pressure difference change on the output flow, a mechanical pressure compensator is usually connected in series or in parallel with the throttling valve port to maintain the pressure difference between two ends of the throttling valve to be approximately constant, but the defects of low control precision, low frequency response and large flow overshoot and energy loss are overcome.
In order to improve the technical problem, in recent years, a digital differential pressure compensation technique has been proposed, which uses a pressure sensor to detect a pressure signal of an inlet-outlet differential pressure of a valve and accurately controls a flow rate through a digital flow compensator. The electro-hydraulic proportional pressure-reducing and speed-regulating composite control valve with the publication number of CN1053110 utilizes a control algorithm and a hardware circuit to improve the control precision and the equal flow characteristics of the valve, but because of the influence of the dynamic response of the hardware circuit, the dynamic response of a pressure sensor and the operation time of the control algorithm, when the inlet pressure or the load pressure of a hydraulic valve is suddenly changed, the phenomena of valve core impact and flow overshoot are still caused, and the dynamic performance of the valve is seriously influenced.
Disclosure of Invention
In order to overcome the defects of the existing digital differential pressure compensation technology, the invention provides a plug-in type two-stage proportional speed regulating valve based on a pressure fly-up rate detector, wherein the proportional speed regulating valve utilizes the pressure fly-up rate detector to detect the change of the inlet pressure or the outlet pressure of a main valve in real time, controls the pressure of a control cavity of the main valve by changing the opening degree of a valve port of the pressure fly-up rate detector, and reduces the flow overshoot of the main valve. The plug-in type two-stage proportional speed regulating valve based on the pressure fly-up rate detector has the advantages of quickly detecting pressure sudden change, quickly adjusting flow overshoot caused by the pressure sudden change, improving the equal flow characteristic of the proportional speed regulating valve by combining a digital flow compensator and improving the dynamic performance of the proportional speed regulating valve.
A cartridge type two-stage proportional speed regulating valve based on a pressure fly-lift rate detector comprises: the device comprises a valve cartridge valve 1, a valve pilot valve 2, a pressure fly-up rate detector 3 and a digital flow compensator 4; the pressure rising rate detector comprises an inlet pressure rising rate detection valve 5 and an outlet pressure rising rate detection valve 6, wherein the inlet pressure rising rate detection valve comprises an I-th two-position two-way sliding valve 7 and an I-th orifice 13, and an I-th control cavity P is formed by an I-th valve core 8, an I-th right-side spring 11 and a right-end valve cavity of the inlet pressure rising rate detection valve1Control chamber I1Is communicated with an oil inlet P of the Valvisor cartridge valve, and a first control cavity P1The pressure of the first valve core acts on the right end surface of the first valve core; the second control cavity P is formed by the first valve core of the inlet pressure flying rate detection valve, the first left spring 12 and the left end valve cavity of the inlet pressure flying rate detection valve2Second control chamber P2Is communicated with an oil inlet P of a valve main valve through a first I throttling hole, and a second control cavity P2The pressure of the first valve core acts on the left end surface of the first valve core;
the outlet pressure flying rate detection valve comprises a second II two-position two-way slide valve 14 and a second II throttling hole 15The second valve core 16, the second right spring 17 and the right valve cavity of the outlet pressure flying rate detection valve form a third control cavity P3III control Chamber P3A third control chamber P communicated with the oil outlet T of the main valve3The pressure of the second valve core acts on the right end face of the second valve core; the second valve core, the second left spring 18 and the left end valve cavity form a fourth control cavity P4IV control Chamber P4A IV control chamber P communicated with the main valve oil outlet T through a II throttle hole4The pressure of the second valve core acts on the left end face of the second valve core;
control cavity P of valve main valveCThe oil outlet of the main valve is connected with the oil outlet f of the pilot valve and the III control cavity P of the outlet pressure flying-rising rate detection valve3And IV control chamber P4The outlet pressure sensor detects the pressure of the oil outlet T of the main valve and inputs the pressure into the digital flow compensator, the oil inlet P of the main valve and the I-th control cavity P of the inlet pressure rising rate detection valve1And the second control chamber P2And the inlet pressure sensor detects the pressure of an oil inlet P of the valve main valve and inputs the pressure into the digital flow compensator, and an output port of the digital flow compensator is connected with a proportional amplifier of the pilot valve.
The digital flow compensator detects the pressure at the inlet and outlet of the main valve, calculates the pressure difference between the inlet and outlet of the main valve, and realizes the equal flow characteristic of the proportional speed regulating valve through a control algorithm.
The valve is a cartridge valve; the pilot valve is a direct-acting proportional speed regulating valve.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention detects the pressure difference between the inlet and the outlet of the main valve through the pressure sensor, and forms electronic closed-loop control with the digital flow compensator, thereby realizing the flow control characteristics of the proportional speed regulating valve and the like and improving the flow control precision of the proportional speed regulating valve.
2. The invention is at the main valveA pressure fly-up rate detector is arranged between the main valve and the pilot valve, when the pressure of an oil inlet (or an oil outlet) of the valve main valve is suddenly changed, the pressure change quantity is detected in real time, and the valve port opening of the pressure fly-up detection valve is changed to control the main valve control cavity PCThe pressure of the proportional speed regulating valve is reduced, the valve core impact of the main valve is reduced, the flow overshoot caused by the valve core impact is reduced, and the dynamic performance quality of the proportional speed regulating valve is improved.
3. The invention detects the pressure change of the oil inlet (outlet) of the main valve by the pressure-rising rate detector, adjusts the pressure of the control cavity of the main valve in time, inhibits the pressure overshoot, and simultaneously combines the control algorithm to enable the flow to reach the stable state quickly.
Drawings
FIG. 1 is a structural diagram of the cartridge type two-stage proportional speed control valve of the present invention;
FIG. 2 is a schematic diagram of a pressure fly-up rate detector;
fig. 3 is a control strategy diagram of the digital flow compensator.
In the figure: 1-a Valvisor master valve; 2-a Valvisor pilot valve; 3-a pressure fly-up rate detector; 4-a digital flow compensator; 5-inlet pressure rising rate detection valve; 6-outlet pressure rising rate detection valve; 7-second I two-position two-way spool valve; 8-th spool; 9-valve pocket I; 10-the II valve pocket; 11-ith right spring; 12-ith left spring; 13-th orifice; 14-a second two-position two-way spool valve; 15-the II th orifice; 16-second spool; 17-the II right spring; 18-the IIth left spring; 19-inlet pressure sensor; 20-outlet pressure sensor; 21-a subtractor; 22-a bilinear interpolator; 23-selecting a controller; 24-switch.
Detailed Description
The detailed technical scheme of the invention is described in the following with the accompanying drawings:
as shown in fig. 1-2, a cartridge type two-stage proportional speed regulating valve based on a pressure rising rate detector comprises: the device comprises a valve cartridge valve 1, a valve pilot valve 2, a pressure fly-up rate detector 3 and a digital flow compensator 4; the pressure flying rate detector comprises an inlet pressure flying rate detection valve 5 and an outlet pressure flying rate detection valve 6, wherein the inlet pressure flying rate is detected by the pressure flying rate detection valveThe check valve, including the second I two position two way spool valve 7 and the I orifice 13, the second I two position two way spool valve includes: an I valve core 8, an I valve sleeve 9, an I right side spring 11, an I left side spring 12 and an I throttle hole 13; the I-th valve core 8, the I-th right spring 11 of the inlet pressure flying rate detection valve and the right valve cavity of the inlet pressure flying rate detection valve form an I-th control cavity P1Control chamber I1Is communicated with an oil inlet P of the Valvisor cartridge valve, and a first control cavity P1The pressure of (2) acts on the right end face of the valve core; the second control cavity P is formed by the first valve core of the inlet pressure flying rate detection valve, the first left spring 12 and the left end valve cavity of the inlet pressure flying rate detection valve2Second control chamber P2Is communicated with an oil inlet P of a valve main valve through a first I throttling hole, and a second control cavity P2Acts on the left end face of the valve core.
The outlet pressure flying rate detection valve comprises a second II two-position two-way slide valve 14 and a second throttling hole 15, wherein the second II two-position two-way slide valve comprises: a II valve core 16, a II valve sleeve 10, a II right spring 17 and a II left spring 18; a second valve core 16 and a second right spring 17 of the outlet pressure flying rate detection valve and a right valve cavity of the outlet pressure flying rate detection valve form a third control cavity P3III control Chamber P3A third control chamber P communicated with the oil outlet T of the main valve3The pressure of the valve core acts on the right end surface of the valve core; the second valve core, the second left spring 18 and the left end valve cavity form a fourth control cavity P4IV control Chamber P4A fourth control chamber P communicated with the oil outlet T of the main valve through a second throttle hole II4Acts on the left end face of the valve core.
Control cavity P of valve main valveCThe oil outlet of the main valve is connected with the oil outlet f of the pilot valve and the III control cavity P of the outlet pressure flying-rising rate detection valve3And IV control chamber P4Communicating, the outlet pressure sensor detecting the main valve outletThe pressure of the oil port T is input into a digital flow compensator, an oil inlet P of a main valve and an I-th control cavity P of an inlet pressure rising rate detection valve1And the second control chamber P2And the inlet pressure sensor detects the pressure of an oil inlet P of the valve main valve and inputs the pressure into the digital flow compensator, and an output port of the digital flow compensator is connected with a proportional amplifier of the pilot valve.
As shown in fig. 3, the digital flow compensator includes: an inlet pressure sensor 19, an outlet pressure sensor 20, a subtractor 21, a bilinear interpolator 22, a selection controller 23, and a switch 24; the inlet pressure sensor and the outlet pressure sensor are used for detecting the pressure values of the inlet and the outlet of the main valve, and then the inlet and the outlet pressure difference delta P is obtained through the calculation of the subtracter, and the obtained value after the delta P is opened and the expected flow qdThe control voltage U of the pilot valve is obtained by inputting the two linear interpolators togetherpThe selector compares Δ P with a minimum differential pressure set point Δ PminWhen Δ P>ΔPminWhen the output signal value of the comparator is 1, the switch is in an on state, and the control voltage of the pilot valve is UpAnd U isp>0; when Δ P is less than or equal to Δ PminWhen the output signal value is 0, the switch is in an off state, and the control voltage of the pilot valve is 0.
When the load is suddenly increased, the pressure at the oil outlet of the main valve is suddenly increased, so that the main valve core is impacted upwards, and meanwhile, the I control cavity P of the outlet pressure flying-rising rate detection valve1Sudden pressure rise due to the second control chamber P of the outlet pressure fly-up check valve2The valve core moves to the left end quickly, and the opening of the valve port is reduced, so that the pressure of a control cavity of the main valve is increased quickly, and the overshoot of the valve core of the main valve is inhibited; meanwhile, the pressure sensor detects that the differential pressure of the valve port of the main valve is reduced, the digital flow compensator calculates the compensation of the control voltage of the pilot valve, the opening degree of the pilot valve port is adjusted to be a proper value, and then the main valve port also changes correspondingly, so that the output flow of the main valve is kept stable. When the inlet pressure is raised, the control process is the same as above.
When the load pressure suddenly decreases, the pressure of the oil outlet suddenly drops to cause the mainThe valve core suddenly descends, and meanwhile, the outlet pressure rises to detect the third control cavity P of the valve3Sudden pressure drop due to the outlet pressure rising in the IV control chamber P of the detection valve4Because of the fixed throttling opening, the pressure change is slow, so that the stress at two ends of the valve core is unbalanced, and the valve core moves to the right end rapidly, thereby leading the pressure of the control cavity of the main valve to drop rapidly and inhibiting the overshoot of the valve core of the main valve; the oil outlet suddenly drops, the pressure difference of the oil outlet of the main valve core suddenly changes, the opening of a pilot valve port is increased through the compensation of a digital flow compensator on the control voltage of the pilot valve, the flow of the pilot valve is increased, the flow of the main valve is linearly amplified, the flow change caused by the sudden change of the pressure is compensated for the increase of the flow of the main valve, and the equal flow characteristics of the proportional speed regulating valve are improved. When the inlet pressure suddenly drops, the control process is the same as above.
The invention restrains the impact of the main valve core, reduces the flow overshoot and improves the dynamic performance and equal flow characteristic of the valve core by combining the pressure flying rate detector and the digital flow compensator.
The valve is a cartridge valve; the pilot valve is a direct-acting proportional speed regulating valve.
The digital flow compensator detects the pressure difference between the inlet and the outlet of the main valve, and forms an electric closed loop through a control algorithm to realize the equal flow characteristics of the proportional speed regulating valve, and all algorithms capable of realizing the functions can be applied to the valve.
Claims (3)
1. The utility model provides a cartridge formula two-stage proportional speed control valve based on pressure flies to rise speed detector which characterized in that: the method comprises the following steps: the device comprises a valve main valve (1), a valve pilot valve (2), a pressure fly-up rate detector (3) and a digital flow compensator (4); the pressure flying rate detector comprises an inlet pressure flying rate detection valve (5) and an outlet pressure flying rate detection valve (6), wherein the inlet pressure flying rate detection valve comprises a second I two-position two-way sliding valve (7) and an I throttle hole (13), and an I valve core (8), an I right spring (11) and a right valve cavity of the inlet pressure flying rate detection valve form an I control cavityP 1Control chamber IP 1Is communicated with an oil inlet P of a valve main valve and is provided with a control cavity IP 1The pressure of the first valve core acts on the right end surface of the first valve core; the I valve core of the inlet pressure flying rate detection valve, the I left side spring (12) and the left end valve cavity of the inlet pressure flying rate detection valve form a II control cavityP 2Second control chamberP 2Is communicated with an oil inlet P of a valve main valve through a first throttling hole I and a second control cavityP 2The pressure of the first valve core acts on the left end surface of the first valve core;
the outlet pressure rising rate detection valve comprises a second II two-position two-way sliding valve (14) and a second II throttle hole (15), wherein a second II valve core (16), a second II right spring (17) and a right valve cavity of the outlet pressure rising rate detection valve form a third control cavityP 3Control chamber IIIP 3A third control chamber communicated with the oil outlet T of the main valveP 3The pressure of the second valve core acts on the right end face of the second valve core; the second valve core, the second left spring (18) and the left end valve cavity form an IV control cavityP 4Fourth control chamberP 4Through a second orifice connected to the outlet T of the main valve, and a fourth control chamberP 4The pressure of the second valve core acts on the left end face of the second valve core;
control cavity of valve main valveP CThe oil outlet b of the inlet pressure flying rate detection valve is connected with the oil inlet c of the outlet pressure flying rate detection valve, the oil outlet d of the outlet pressure flying rate detection valve is connected with the oil inlet e of the pilot valve, the oil outlet T of the main valve is connected with the oil outlet f of the pilot valve and the III control cavity of the outlet pressure flying rate detection valveP 3And IV control chamberP 4The outlet pressure sensor detects the pressure of the oil outlet T of the main valve and inputs the pressure into the digital flow compensator, the oil inlet P of the main valve and the I control cavity of the inlet pressure rising rate detection valveP 1And the second control chamberP 2The inlet pressure sensor detects the pressure of an oil inlet P of a valve main valve and inputs the pressure into the digital flow compensator, and an output port and a pilot of the digital flow compensatorThe proportional amplifier of the valve is connected.
2. The cartridge type two-stage proportional speed regulating valve based on the pressure fly-lift speed detector as claimed in claim 1, wherein: the digital flow compensator detects the pressure at the inlet and outlet of the main valve, calculates the pressure difference between the inlet and outlet of the main valve, and realizes the equal flow characteristic of the proportional speed regulating valve through a control algorithm.
3. The cartridge type two-stage proportional speed regulating valve based on the pressure fly-lift speed detector as claimed in claim 1, wherein: the valve is a cartridge valve; the pilot valve is a direct-acting proportional speed regulating valve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910961211.4A CN110725823B (en) | 2019-10-11 | 2019-10-11 | Plug-in type two-stage proportional speed regulating valve based on pressure flying rate detector |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910961211.4A CN110725823B (en) | 2019-10-11 | 2019-10-11 | Plug-in type two-stage proportional speed regulating valve based on pressure flying rate detector |
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| CN110725823A CN110725823A (en) | 2020-01-24 |
| CN110725823B true CN110725823B (en) | 2021-07-16 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3612684A1 (en) * | 1986-04-15 | 1987-10-22 | Heilmeier & Weinlein | HYDRAULIC CONTROL DEVICE |
| CN101929482A (en) * | 2010-08-25 | 2010-12-29 | 太原理工大学 | Proportional flow valve controlled by pilot flow closed loop |
| CN102155449A (en) * | 2011-03-31 | 2011-08-17 | 太原理工大学 | Digitally controlled leading type proportional flow valve |
| DE102012007108A1 (en) * | 2012-04-07 | 2013-10-10 | Robert Bosch Gmbh | Valvistor arrangement has pilot branch, in which pilot valve and associated pressure regulator are arranged, where pressure regulator is arranged downstream of pilot valve |
| CN109630491A (en) * | 2018-12-26 | 2019-04-16 | 太原理工大学 | A kind of automatically controlled compensation two-way proportional flow control valve |
-
2019
- 2019-10-11 CN CN201910961211.4A patent/CN110725823B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3612684A1 (en) * | 1986-04-15 | 1987-10-22 | Heilmeier & Weinlein | HYDRAULIC CONTROL DEVICE |
| CN101929482A (en) * | 2010-08-25 | 2010-12-29 | 太原理工大学 | Proportional flow valve controlled by pilot flow closed loop |
| CN102155449A (en) * | 2011-03-31 | 2011-08-17 | 太原理工大学 | Digitally controlled leading type proportional flow valve |
| DE102012007108A1 (en) * | 2012-04-07 | 2013-10-10 | Robert Bosch Gmbh | Valvistor arrangement has pilot branch, in which pilot valve and associated pressure regulator are arranged, where pressure regulator is arranged downstream of pilot valve |
| CN109630491A (en) * | 2018-12-26 | 2019-04-16 | 太原理工大学 | A kind of automatically controlled compensation two-way proportional flow control valve |
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