CN102768009B - A kind of device measuring the displacement of reciprocating-pump valve valve disc - Google Patents
A kind of device measuring the displacement of reciprocating-pump valve valve disc Download PDFInfo
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- CN102768009B CN102768009B CN201210255444.0A CN201210255444A CN102768009B CN 102768009 B CN102768009 B CN 102768009B CN 201210255444 A CN201210255444 A CN 201210255444A CN 102768009 B CN102768009 B CN 102768009B
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Abstract
Measure a device for reciprocating-pump valve valve disc displacement, for measuring the change in displacement of valve disc in reciprocating-pump valve motion process.Apparatus of the present invention primarily of valve seat 1, valve disc 2, spring 3, top guide bar 4, outer nut 5, inductive frequency displacement transducer power lead 6, inductive frequency displacement transducer signal line 7, " O " RunddichtringO 8, bolt 9, cylinder cap 10, inner nut 11, fluid cylinder 12, inductive frequency displacement transducer 13, inductive frequency displacement transducer guide rod 14, digital inductance FM sensor direct supply 17, reciprocating pump flow signal 18, reciprocating pump pressure signal 19, data acquisition unit 20, the compositions such as computing machine and valve disc displacement measurement analytic system 21.The inductive frequency displacement transducer 13 be arranged on reciprocating pump valve cylinder cap 10 has that quality is light, waterproof, anti-high pressure, sensitivity high; Cylinder cap 10 is furnished with and inductive frequency displacement transducer 13 can be allowed to pass through and ensure " O " RunddichtringO 8 that reciprocating pump does not leak; The valve disc displacement signal that inductive frequency displacement transducer 13 exports and reciprocating pump flow signal 18, reciprocating pump pressure signal 19 import into after computing machine 21 through data acquisition unit 20, Treatment Analysis is carried out by the pump valve displacement measurement analytic system of independent development, obtain the Changing Pattern of reciprocating pump pump valve valve disc displacement under different flow and pressure, for research reciprocating-pump valve valve disc displacement movement rule and checking without impact theory, improve reciprocating-pump valve design theory scientific basis be provided.
Description
Technical field
The invention provides a kind of device measuring the displacement of reciprocating-pump valve valve disc, displacement transducer is arranged on reciprocating-pump valve valve disc by device, directly can record the change in displacement situation of reciprocating-pump valve valve disc in opening and closing process, in order to study the actual movement rule of reciprocating-pump valve valve disc, verify that various pump valve is without impact theory, for pump valve design provides foundation.Device is furnished with inductive frequency displacement transducer, this sensor has waterproof, the feature of anti-high pressure, pump valve cylinder cap is furnished with sensor can be allowed to pass through and ensure the packoff that pump does not leak, and is equipped with independently developed special reciprocating-pump valve valve disc displacement measurement analytic system.
Background technology
Pump valve is one of most important parts in reciprocating pump, and the characteristics of motion of pump valve valve disc is reciprocating pump design-calculated important evidence.For a long time, the correlated results that the design of reciprocating-pump valve is based on the steady flow principle in hydraulics always derives carries out, the wherein characteristics of motion (the lift h of valve disc, the lifting speed v of valve disc of valve disc
v, valve disc lifting speed a
v) be all according to liquid be steady flow namely in valve clearance with constant speed flowing, the amount of liquid of discharge or suction that the amount of liquid flowing through valve clearance equals fluid cylinder inner carrier obtains.But in fact owing to not considering the impact of valve disc quality and spring force in derivation and calculating, do not consider the inertial force that valve disc moves, do not consider that valve disc is closed with unlatching and piston movement to the asynchronous corresponding factor of dead-centre position, and the amount of liquid flowing through valve clearance needs not be equal to the discharge of fluid cylinder inner carrier or the amount of liquid of suction.Because valve disc is airtight and have in the pumping cylinder of pressure and move, cannot its characteristics of motion of observation test easily, researcher for a long time ignores this problem always, few people carried out the experiment work about the pump valve characteristics of motion, even if carried out part research work, but also result of study is not risen to summary and the description of the pump valve characteristics of motion, thus the design of reciprocating pump, application continue to use always before the theory of computation and method.
German scholar Adolph (U.Adolph) is deduced the non-linear divalence differential equation about valve disc motion by the equilibrium condition that valve disc is stressed and thinks, close in a flash at pump valve, valve disc is stopped suddenly by motion state, and the kinetic energy of valve disc becomes impact energy.This impact energy makes the contact surface abrasion of valve disc and valve seat very fast, causes leakage aggravation, even destroys the normal work of pump.Therefore when design and use reciprocating pump, because ensureing that the impact that valve disc is fallen on valve seat is no more than allowed band, namely ensure so-called without impact condition, namely when not considering hysteresis phenomenon and inertial force, square being directly proportional of speed and crank angular velocity when valve disc falls, its kinetic energy is then directly proportional to the biquadratic of crank angular velocity.So when the design and use of pump, in order to reduce impact, generally will control crank angular velocity ω (or strokes per minute n of pump), making it can not be too high.
In fact, the hysteresis phenomenon of valve disc is comparatively large on the impact in pump valve life-span, and delayed more serious, delayed height is larger, and the effect of valve disc two-way pressure difference is also larger, and thus sinking speed is larger.Derivation is learnt, delayed height h
0∝ ω
2.Accordingly, the former Russian scholar storehouse can row Paderewski
with the maximum lowering speed v of valve disc under steady flow condition
vmaxfor critical value, release the maximum lift hmax of valve disc and the relation of strokes per minute n, namely so-called pump valve without impact condition is: nh
max=10v
vmax.
By above elaboration, can clearly find out, the displacement (lift) of valve disc, speed, the kinematic parameters such as acceleration are with crank, the rule of piston movement parameter variations realizes being absolutely necessary without impact condition of pump valve for guarantee, but due to the difficulty of test job, not yet see the report of the experiment work about measuring the displacement of reciprocating-pump valve valve disc, current design or calculating lack the real data of valve disc displacement, also systematically verification experimental verification is not carried out, owing to have ignored multinomial factor, whether therefore carried out theoretical analysis conforms to actual with calculating, be worth research.
In sum, the design of current pump valve is follow the theoretical calculation formula that 60 ~ seventies of last century, foreign scholar provided substantially, and its basic foundation is without impact theory.Owing to lacking the actual test of valve disc moving displacement rule and complete description, some now conventional reciprocating-pump valve design theories lack the checking of test.Therefore if measure the motion conditions of reciprocating-pump valve valve disc displacement real-time and accurately, itself and theoretical analysis result are carried out com-parison and analysis, set up the realistic valve disc characteristics of motion, just can determine the micromechanism of damage of valve disc on this basis, examine the rationality without impact theory and correctness, and then provide scientific basis for scientific design reciprocating-pump valve structure, the background of the displacement tester of Here it is reciprocating-pump valve valve disc provided by the present invention and meaning.
Summary of the invention
Object of the present invention provides a kind of device that directly can measure reciprocating-pump valve valve disc moving displacement.This device have easy to use, cost is low, measure accurate feature, can according to testing the valve disc displacement signal recorded, in conjunction with flow and pressure signal, the moving displacement rule of research pump valve valve disc when pump different flow and different pressures, study the micromechanism of damage of pump valve on this basis, verify the rationality without impact theory and correctness, can be scientific design reciprocating-pump valve structure, improve its serviceability, improve and provide scientific basis its serviceable life.
The present invention is to develop the determining displacement specialized designs of reciprocating-pump valve valve disc, the determinator that inventing provides utilizes inductive frequency displacement transducer to test the change in displacement situation of pump valve valve disc when reciprocating pump works, this sensor has waterproof, anti-high pressure, highly sensitive characteristic, pump valve cylinder cap is furnished with inductive frequency displacement transducer can be allowed to pass through and ensure the packoff that pump does not leak, use the pump valve valve disc displacement measurement analytic system analyzing and processing gained signal of independent development.
The present invention mainly contains following distinguishing feature:
(1) at present reciprocating-pump valve valve disc displacement movement rule and without the research of the aspects such as impact theory mostly based on the theoretical analysis on various hypothesis basis and software simulation emulation, inductive frequency displacement transducer is directly installed on the inner valve disc of reciprocating pump by the present invention, accurately can record the change in displacement in pump valve valve disc opening and closing process in real time;
(2) the inductive frequency displacement transducer chosen has that quality is light, waterproof, anti-high pressure, highly sensitive feature, can not affect the proper motion of reciprocating-pump valve;
(3) pump valve cylinder cap is furnished with digital inductance FM sensor can be allowed to pass through and ensure the packoff that pump does not leak, and be equipped with independently developed pump valve valve disc displacement measurement analytic system to carry out analyzing and processing timely to the signal recorded;
(4) feature of software section is the frequency signal acquisition module that utilizes NI company to provide, uses the independently developed a set of software systems of reciprocating-pump valve valve disc displacement signal being carried out to testing and analysis of Labwindows/CVI language.In test, the moving displacement of valve disc is recorded by digital inductance FM sensor, DC voltage is provided to inductive frequency displacement transducer by direct supply, when valve disc pumps, digital inductance FM sensor produces frequency signal, the detecting and analysing system that flowmeter on pump and manometric flow and pressure signal input computing machine simultaneously will be arranged near inductive frequency displacement transducer signal and displacement transducer by data acquisition unit, the actual displacement in valve disc opening and closing process can be obtained, and then the valve disc change in displacement rule can studied when reciprocating pump different pressures and flow.
Accompanying drawing explanation
The reciprocating-pump valve valve disc displacement sensor arrangement installation sketch that Fig. 1 is proposed by the invention;
The reciprocating-pump valve pump valve displacement transducer exit packoff sketch that Fig. 2 is proposed by the invention;
The reciprocating-pump valve valve disc displacement signal acquisition analytic system sketch that Fig. 3 is proposed by the invention.
Embodiment
Further this covering device is described below in conjunction with accompanying drawing.
1. assay device structures
As seen from Figure 1, as long as determinator is made up of parts such as valve seat 1, valve disc 2, spring 3, top guide bar 4, outer nut 5, inductive frequency displacement transducer power lead 6, inductive frequency displacement transducer signal line 7, " O " RunddichtringO 8, bolt 9, cylinder cap 10, inner nut 11, fluid cylinder 12, inductive frequency displacement transducer 13, inductive frequency displacement transducer guide rods 14, the wherein work conical surface of valve disc 2 and the corresponding cone match (when the valves are closed) of valve seat 1; The inductive frequency displacement transducer 13 of waterproof pressure-resistant is fixed on cylinder cap 10 by screw thread; Cylinder cap 10 adopts " O " RunddichtringO 8, and carries out fastening with outer nut 5 and inner nut 11, prevent pump from leaking; Valve disc top guide bar 4 slides up and down in the inner hole surface of spring 3; Valve disc pumps under fluid matasomatism in pump fluid cylinder chamber.
2. inductive frequency displacement transducer exit packoff
Medium due to pump valve inside is water, and when pump valve runs, internal pressure reaches 2MPa, so will seal reliably inductive frequency displacement transducer 13 exit.As seen from Figure 2, inductive frequency displacement transducer 13 is fixed on cylinder cap 10 by screw thread; Cylinder cap 10 is furnished with " O " RunddichtringO 8 and seal groove 15, and carries out pretension with pad 16 and outer nut 5, make inductive frequency displacement transducer 13 exit to obtain excellent sealing.
3. data acquisition system (DAS)
As seen from Figure 3, the data acquisition system (DAS) of device is by inductive frequency displacement transducer 13, digital inductance FM sensor direct supply 17, data acquisition unit 20, the compositions such as computing machine and valve disc displacement measurement analytic system 21, show the installation site of inductive frequency displacement transducer 13 in figure, and with the connection path of digital inductance FM sensor power supply 17, data acquisition unit 20 and computing machine 21.Inductive frequency displacement flow sensor 13 is for measuring the displacement signal in pump valve valve disc motion process, inductive frequency displacement transducer power lead 6 is connect digital inductance FM sensor direct supply 17, direct supply is provided to inductive frequency displacement transducer 13, then inductive frequency displacement transducer signal line 7 is connect data acquisition unit 20, reciprocating pump flow signal 18 and reciprocating pump pressure signal 19 also input data acquisition unit 20 simultaneously, after signal imports computing machine 21 into by data acquisition unit data line, by the valve disc displacement measurement analytic system of independent development, Treatment Analysis is carried out to displacement signal.
4. principle of work
After inductive frequency displacement transducer 13 and measurement mechanism are arranged on assigned address, be under the condition of water at actuating medium, start reciprocating pump, the situation of change of pump valve valve disc displacement during the work of test reciprocating pump.Displacement signal in pump valve valve disc motion process is recorded by inductive frequency displacement transducer 13, import measured displacement signal and reciprocating pump flow signal 18, reciprocating pump pressure signal 19 into computing machine 21 by data acquisition unit 20 simultaneously, use Labwindows/CVI language independently developed valve disc displacement measurement analytic system to carry out analyzing and processing to signal.Change in displacement rule when the different flow in the pump valve valve disc opening and closing process obtained according to test and pressure, can to verify existing reciprocating-pump valve valve disc displacement movement theoretical calculation formula and perfect, to draw real reciprocating-pump valve valve disc displacement movement rule, so for improving reciprocating-pump valve design theory, improve the structure of pump valve and serviceability provides scientific basis.
Claims (2)
1. measure a device for reciprocating-pump valve valve disc moving displacement, it is characterized in that comprising: valve seat (1), valve disc (2), spring (3), top guide bar (4), outer nut (5), inductive frequency displacement transducer power lead (6), inductive frequency displacement transducer signal line (7), " O " RunddichtringO (8), bolt (9), cylinder cap (10), inner nut (11), fluid cylinder (12), inductive frequency displacement transducer (13), the inductive frequency displacement transducer guide rod (14) of its front end in contact valve disc (2), seal groove (15), pad (16), digital inductance FM sensor direct supply (17), reciprocating pump flow signal (18), reciprocating pump pressure signal (19), data acquisition unit (20), computing machine and valve disc displacement measurement analytic system (21), inductive frequency displacement transducer (13) is fixed on reciprocating-pump valve cylinder cap (10) by screw thread, the front end of the guide rod (14) of inductive frequency displacement transducer (13) should contact valve disc (2), and can move up and down along with valve disc (2), thus generation displacement signal, upper " O " RunddichtringO (8) that adopts of cylinder cap (10) seals, and carry out fastening with outer nut (5) and inner nut (11), ensure that pump does not leak, make the displacement signal of inductive frequency displacement transducer (13) energy stably measured valve disc (2).
2. the determinator according to right 1, it is characterized in that: provide direct supply by digital inductance FM sensor direct supply (17) to inductive frequency displacement transducer (13), when valve disc (2) pumps, inductive frequency displacement transducer (13) can measure the displacement signal in valve disc moving displacement process, by data acquisition unit (20) by this displacement signal and reciprocating pump flow signal (18), reciprocating pump pressure signal (19) inputs in computing machine and valve disc displacement measurement analytic system (21) simultaneously, processed by the pump valve valve disc displacement measurement analytic system of independent development, reciprocating pump can be obtained at different flow, change in displacement rule under different pressures in pump valve valve disc opening and closing process, and then for improving reciprocating-pump valve design theory, structure and the serviceability of improving pump valve provide scientific basis.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210255444.0A CN102768009B (en) | 2012-07-24 | 2012-07-24 | A kind of device measuring the displacement of reciprocating-pump valve valve disc |
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|---|---|---|---|
| CN201210255444.0A CN102768009B (en) | 2012-07-24 | 2012-07-24 | A kind of device measuring the displacement of reciprocating-pump valve valve disc |
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| CN102768009A CN102768009A (en) | 2012-11-07 |
| CN102768009B true CN102768009B (en) | 2015-12-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110005960A (en) * | 2018-01-04 | 2019-07-12 | 黄羽婵 | The method of the automatic detection gas leakage of gas burning system |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103278392A (en) * | 2013-05-15 | 2013-09-04 | 三峡大学 | Test piece deformation measurement device in high-pressure water environment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2050587U (en) * | 1989-07-04 | 1990-01-03 | 中国人民解放军空军工程设计研究局 | Displacement sensor |
| CN2128378Y (en) * | 1992-07-13 | 1993-03-17 | 天津市工业自动化仪表研究所 | Capacity sensor for metering foam position in fermentation tank |
| US5742161A (en) * | 1992-11-23 | 1998-04-21 | Mannesmann Aktiengesellschaft | Method and device for detecting displacement of valve rod movement in an electropneumatic position regulator with at least one proximity sensor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007303849A (en) * | 2006-05-09 | 2007-11-22 | Toyota Motor Corp | Lift performance detection device |
-
2012
- 2012-07-24 CN CN201210255444.0A patent/CN102768009B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2050587U (en) * | 1989-07-04 | 1990-01-03 | 中国人民解放军空军工程设计研究局 | Displacement sensor |
| CN2128378Y (en) * | 1992-07-13 | 1993-03-17 | 天津市工业自动化仪表研究所 | Capacity sensor for metering foam position in fermentation tank |
| US5742161A (en) * | 1992-11-23 | 1998-04-21 | Mannesmann Aktiengesellschaft | Method and device for detecting displacement of valve rod movement in an electropneumatic position regulator with at least one proximity sensor |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110005960A (en) * | 2018-01-04 | 2019-07-12 | 黄羽婵 | The method of the automatic detection gas leakage of gas burning system |
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| CN102768009A (en) | 2012-11-07 |
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Effective date of registration: 20210318 Address after: 226631 industrial concentration area (Hongqi Village), Libu Town, Hai'an City, Nantong City, Jiangsu Province Patentee after: JIANGSU MINGGE FORGING EQUIPMENT Co.,Ltd. Address before: Gehu Lake Road Wujin District 213016 Jiangsu city of Changzhou province No. 1 Patentee before: CHANGZHOU University |