CN107525876A - A kind of automatic back pressure regulator applied to supercritical fluid chromatography system - Google Patents
A kind of automatic back pressure regulator applied to supercritical fluid chromatography system Download PDFInfo
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- CN107525876A CN107525876A CN201610448627.2A CN201610448627A CN107525876A CN 107525876 A CN107525876 A CN 107525876A CN 201610448627 A CN201610448627 A CN 201610448627A CN 107525876 A CN107525876 A CN 107525876A
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- back pressure
- stepper motor
- spring
- valve body
- supercritical fluid
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/26—Conditioning of the fluid carrier; Flow patterns
- G01N30/28—Control of physical parameters of the fluid carrier
- G01N30/32—Control of physical parameters of the fluid carrier of pressure or speed
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Abstract
The invention discloses a kind of automatic back pressure regulator applied to supercritical fluid chromatography system, it is related to supercritical fluid chromatography field, is mainly made up of electric electrohydraulic controller, stepper motor, back pressure valve body, bearing, screw pair, push rod, spring, spring base, cone valve, pressure sensor.Back pressure valve body is provided with import, installation screwed hole and outlet composition.The present invention uses electro-hydraulic closed-loop control system, it is simple to operate, highly reliable, during supercritical system works can automatic Regulation, control accuracy it is high, meet the requirement of industry spot application.
Description
Technical field
The present invention relates to a kind of automatic back pressure regulator applied to supercritical fluid chromatography system, belongs to electrichydraulic control certainly
Dynamicization field.
Background technology
Supercritical fluid chromatography (supercritical fluid chromatography, abbreviation SFC) is with overcritical
Fluid (a kind of state of material when higher than critical pressure and critical-temperature, have the low viscosity of gas, the high density of liquid with
And the feature such as higher diffusion coefficient between air-liquid) it is mobile phase, solid absorbent or the high polymer being bonded on carrier
For the chromatogram of stationary phase.It not only can the difficult separation of segregation gas chromatography thermally labile, relative molecular mass it is higher, it is highly polar or
Non-volatile compounds, and the high relative molecular mass compound that high performance liquid chromatography is difficult to separate can be separated.Exist simultaneously
The activity of target compound can be kept in separation preparation process well, is had compared with other separation methods unrivaled excellent
Gesture.Supercritical fluid especially used in it is generally carbon dioxide, and caused Discarded organic solvent is few, and pollution is small, more environmentally friendly.
How by CO2Overcriticalization is the key issue of supercritical fluid chromatography system, according to CO2Critical point temperature be
30.98 DEG C, pressure 7.377MPa, typically by improving temperature and in fluid path increasing counterbalance valve to press after improving pump after pump
The method of power and realize CO2Overcriticalization.Common counterbalance valve mainly manually regulation built in spring elastic force compressive films
Piece realizes CO2Overcriticalization, cumbersome, control accuracy is low, controllability is poor.Therefore, developing one kind can adjust automatically
The high-precision back pressure regulator for saving system pressure is an important topic for needing to solve in Supercritical fluid chromatography system research.
The content of the invention
The purpose of the present invention is to capture the defects of back pressure regulating valve is present in existing supercritical fluid chromatography system, there is provided one
It is kind reasonable in design, using simple, the high automatic back pressure regulator of control accuracy.
To achieve the above objectives, the technical solution adopted in the present invention is as follows：
A kind of High Precision Automatic back pressure regulator applied to supercritical fluid chromatography system is by electrohydraulic controller（1）, stepping electricity
Machine（2）, back pressure valve body（3）Bearing（4）Screw pair（5）, push rod（6）, spring（7）, spring base（8）, cone valve（9）, pressure
Force snesor（10）Composition；Wherein electrohydraulic controller（1）Include power module（14）, MCU control module（15）, analog acquisition
Module (16), driving stepper motor module (17), LCD liquid crystal displays（18）, key-press input panel（19）；Back pressure valve body（3）
It is provided with import（11）, installation screwed hole（12）And outlet（13）；Import（11）And outlet（13）It is coaxially located at counterbalance valve（3）It is left
Right both sides, screwed hole is installed（12）Positioned at counterbalance valve（3）Bottom；Spring（7）Bottom and spring base（8）Top is in contact, cone valve
（9）It is placed in spring base（8）Inside, push rod（6）It is placed in screw pair（5）Inside, pressure sensor（10）Installed in the back of the body
Pressure valve（3）Import（11）Left side.
The central scope of the present invention is, by electrohydraulic controller, pressure sensor, stepper motor and counterbalance valve decomposition pressure control
Loop processed, fluid enters after supercritical system forms pressure in counterbalance valve entrance pipe, by installed in back pressure valve inlet front end
Pressure sensor collection inlet ductwork pressure value, pass through the key-press input panel of electrohydraulic controller, initialization system pressure value
And pid control parameter, counterbalance valve entrance pipe pressure value with set system pressure value compared with, electrohydraulic controller according to than
The pressure difference value obtained more afterwards, controls the rotation direction of stepper motor, and push rod is moved up and down under the drive of stepper motor, changed
Becoming the decrement of spring, spring base changes the size of cone valve aperture in the presence of spring force, and then regulating system pipeline
Pressure.
The invention has the advantages that and advantage：
The present invention use electro-hydraulic closed-loop control system, it is simple to operate, highly reliable, supercritical system work during can be automatic
Pressure regulation, control accuracy are high, meet the requirement of industry spot application.Applied in the control signal output design of electrohydraulic controller
Digital Signal Processing, torque and the rotation direction of stepper motor can be accurately controlled.In analogue collection module, select
High-precision A/D chip, suppress and compensate for the temperature drift phenomenon of pressure sensor, improve the signal output of pressure sensor
Stability.The valve port that the pressure adjusting structure of counterbalance valve instead of conventional spring-diaphragm type using cone valve design built in spring base is opened
Control mode, overcome back pressure valve film diaphragm under the impact of long-term inlet high pressure and be easily broken and the defects of deformation failure.
Brief description of the drawings
Fig. 1 is automatic back pressure regulator schematic diagram.Wherein, 1, electrohydraulic controller 2, stepper motor 3, back pressure valve body 4, axle
Hold 5, screw pair 6, push rod 7, spring 8, spring base 9, cone valve 10, pressure sensor 11, import 12, installation screwed hole 13,
Outlet
The structural representation of Fig. 2 electrohydraulic controllers.Wherein, 14, power module 15, MCU control module 16, analog acquisition mould
Block 17, driving stepper motor module 18, LCD liquid crystal displays 19, key-press input panel.
Embodiment
Describe the specific implementation process of the present invention in detail with reference to accompanying drawing.
Installation screwed hole 12 is used to fix back pressure valve body 3, is electro-hydraulic by power module 14 after supercritical system start
Controller 1 provides direct-current working volts, passes through the LCD liquid crystal displays 18 and the initialization system of key-press input panel 19 of electrohydraulic controller 1
The pid parameter of pressure value and Stress control comparison program, while the MCU control module 15 of electrohydraulic controller 1, the setting to system
The system line pressures value that pressure value and pressure sensor 10 collect carries out the processing of pressure comparison program, calculates the institute of spring 7
The compression needed or amount of tension, stepper motor 2 is controlled to carry out rotating by driving stepper motor module 17, stepper motor 2
Rotary shaft is connected by bearing 4 with push rod 6, drives screw pair 5 to move up and down, and changes the compression or stretching of spring 7
Amount, while change the aperture size of the cone valve 9 built in spring base 8, the inlet and outlet that cone valve 9 blocks or connected on back pressure valve body 3
Pipeline.
When there is fluid to flow into back pressure valve body 3 through import 11, pressure, pressure are formed in the pipeline of back pressure valve body 3
Sensor 10 is given the line pressure signal at the import 11 of back pressure valve body 3 of detection to analogue collection module 16 in real time and carried out
Analogue collection module 16 is handled the pressure value after computing, set with system by processing, the MCU control module 15 of electrohydraulic controller 1
Level pressure force value is compared.When line pressure is more than the system pressure value of setting, the driving stepper motor of electrohydraulic controller 1
Module 17 controls stepper motor 2 to be inverted, and the rotary shaft of stepper motor 2 drives push rod 6 to move upwards and drawn spring 7
Stretch, the aperture of cone valve 9 becomes big, and the import and export pipeline conducting of back pressure valve body 3 carries out pressure release, and system line pressures reduce, fluid
Through the outflow of outlet 13；When loine pressure is less than the system pressure value of setting, the driving stepper motor module 17 of electrohydraulic controller 1
Control stepper motor 2 is rotated forward, and drives push rod 6 to move downward compression spring 7, the aperture of cone valve 9 is diminished, counterbalance valve master
The import and export pipeline of body 3 is isolated, and system line pressures constantly rise；Loine pressure at the import 11 of back pressure valve body 3 is equal to
During the system pressure value of setting, stepper motor 2 stops operating, and the aperture of cone valve 9 keeps constant, and system line pressures are kept not
Become.
Above example is the description of the invention and is explained further, rather than limitation of the present invention, in the present invention
Interest field in any modification for being made, both fall within protection scope of the present invention.
Claims (3)
- A kind of 1. automatic back pressure regulator applied to supercritical fluid chromatography system, by electrohydraulic controller（1）, stepper motor （2）, back pressure valve body（3）, bearing（4）, screw pair（5）, push rod（6）, spring（7）, spring base（8）, cone valve（9）, pressure Force snesor（10）Composition；Wherein electrohydraulic controller（1）By power module（14）, MCU control module（15）, analog acquisition mould Block (16), driving stepper motor module (17), LCD liquid crystal displays（18）, key-press input panel（19）Composition；Back pressure valve body （3）It is provided with import（11）, installation screwed hole（12）And outlet（13）；Import（11）And outlet（13）It is coaxially located at counterbalance valve master Body（3）The left and right sides, screwed hole is installed（12）Back pressure valve body（3）Bottom；Spring（7）Bottom and spring base（8）Top connects Touch, cone valve（9）It is placed in spring base（8）Inside, push rod（6）It is placed in screw pair（5）Inside, pressure sensor（10）Peace Mounted in counterbalance valve（3）Import（11）Left side.
- 2. automatic back pressure regulator according to claim 1, it is characterised in that：Stepper motor（2）Rotating shaft pass through bearing （4）With screw pair（5）Upper end is connected, according to electrohydraulic controller（1）The control signal exported carries out rotating campaign, Drive screw pair（5）In push rod（6）Move up and down.
- 3. automatic back pressure regulator according to claim 1, it is characterised in that：The electrohydraulic controller（1）Signal it is defeated Go out end and stepper motor（2）Electrical connection, signal acquisition input and pressure sensor（10）Electrical connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610448627.2A CN107525876A (en) | 2016-06-21 | 2016-06-21 | A kind of automatic back pressure regulator applied to supercritical fluid chromatography system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610448627.2A CN107525876A (en) | 2016-06-21 | 2016-06-21 | A kind of automatic back pressure regulator applied to supercritical fluid chromatography system |
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| Publication Number | Publication Date |
|---|---|
| CN107525876A true CN107525876A (en) | 2017-12-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610448627.2A Pending CN107525876A (en) | 2016-06-21 | 2016-06-21 | A kind of automatic back pressure regulator applied to supercritical fluid chromatography system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113874091A (en) * | 2019-05-15 | 2021-12-31 | 沃特世科技公司 | Method and apparatus for minimizing chromatographic band distortion of a back pressure regulator |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2355184Y (en) * | 1998-12-25 | 1999-12-22 | 常州电力机械厂 | Back pressure regulating valve |
| CN101619778A (en) * | 2009-08-10 | 2010-01-06 | 山东省科学院能源研究所 | Electric auto-control pressure regulating valve for micro-reaction equipment |
| CN204129018U (en) * | 2014-11-19 | 2015-01-28 | 江苏汉邦科技有限公司 | A kind of automatic back pressure apparatus be applied in supercritical fluid chromatography system |
-
2016
- 2016-06-21 CN CN201610448627.2A patent/CN107525876A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2355184Y (en) * | 1998-12-25 | 1999-12-22 | 常州电力机械厂 | Back pressure regulating valve |
| CN101619778A (en) * | 2009-08-10 | 2010-01-06 | 山东省科学院能源研究所 | Electric auto-control pressure regulating valve for micro-reaction equipment |
| CN204129018U (en) * | 2014-11-19 | 2015-01-28 | 江苏汉邦科技有限公司 | A kind of automatic back pressure apparatus be applied in supercritical fluid chromatography system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113874091A (en) * | 2019-05-15 | 2021-12-31 | 沃特世科技公司 | Method and apparatus for minimizing chromatographic band distortion of a back pressure regulator |
| CN113874091B (en) * | 2019-05-15 | 2024-04-09 | 沃特世科技公司 | Method and apparatus for minimizing chromatographic band distortion of a back pressure regulator |
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