CN204129018U - A kind of automatic back pressure apparatus be applied in supercritical fluid chromatography system - Google Patents
A kind of automatic back pressure apparatus be applied in supercritical fluid chromatography system Download PDFInfo
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- CN204129018U CN204129018U CN201420693912.7U CN201420693912U CN204129018U CN 204129018 U CN204129018 U CN 204129018U CN 201420693912 U CN201420693912 U CN 201420693912U CN 204129018 U CN204129018 U CN 204129018U
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Abstract
The utility model discloses a kind of automatic back pressure apparatus be applied in supercritical fluid chromatography system, relate to supercritical fluid chromatography field, be made up of counterbalance valve main body, diaphragm, spring, push rod, stepper motor, pressure control unit and pressure transducer; Counterbalance valve main body is provided with outlet, threaded hole and import.The pressure of inlet ductwork is detected in real time by pressure transducer, pressure control unit is according to the force value control step motor action of inlet ductwork, stepper motor drives push rod knee-action, change the decrement of spring, diaphragm blocks or connects pipeline under the effect of spring force, and then the pressure of regulating system pipeline.This device is simple to operate, and controllability is strong, and degree of accuracy is high, has saved production cost, has improve production efficiency.
Description
Technical field
The utility model relates to that a kind of to be applied in supercritical fluid chromatography system automatic by pressure device, belongs to field of machinery automation.
Background technology
Supercritical fluid chromatography (supercritical fluid chromatography, be called for short SFC) be that (material is higher than a kind of state when emergent pressure and critical temperature with supercritical fluid, there is the features such as the low viscosity of gas, the high density of liquid and coefficient of diffusion higher between gas, liquid) be mobile phase, solid adsorbent or the superpolymer be bonded on carrier are the chromatogram of Stationary liquid.Compared with common liquid chromatography, mobile phase is generally the potpourri of carbon dioxide and organic solvent, not only can be separated thermally labile, high molecular weight, strong polarity and non-volatile compounds that GC difficulty is separated, also can be separated the high molecular weight compound that HPLC is difficult to be separated.In addition supercritical fluid chromatography because rate of propagation is faster, linear velocity is higher, multiple equilibria speed is faster, flux is higher, viscosity is lower, Pressure Drop is little, flow velocity is high, the advantages such as multicolumn sequence separation can be realized and be widely used, especially its supercritical fluid used is generally carbon dioxide, the Discarded organic solvent produced is few, pollute little, more environmental protection.
The problem that current supercritical fluid chromatography system primarily solves is how by CO
2overcriticalization, CO
2critical point temperature be 30.98 DEG C, pressure is 7.377MPa, generally by improve in temperature and the stream after pump increase counterbalance valve increase pump after pressure method and realize CO
2overcriticalization.Wherein, the principle of counterbalance valve is: when system pressure is less than set pressure, and diaphragm is blocking pipeline under the effect of spring force; When system pressure is larger than set pressure, diaphragm Compress Spring, pipeline is connected, and liquid passes through counterbalance valve.Common counterbalance valve mainly manually regulates the elastic force of built-in spring to realize CO
2overcriticalization, complex operation, controllability is poor.Therefore, developing a kind of can the back pressure apparatus of varitrol pressure be the important topic needing in the research of Supercritical fluid chromatography instrument to solve.
Summary of the invention
The purpose of this utility model captures the defect that in existing supercritical fluid chromatography system, common back pressure apparatus exists, and provides a kind of simple to operate, the automatic back pressure apparatus that controllability is strong.
For reaching above object, the technical scheme that the utility model adopts is as follows:
Be applied to the automatic back pressure apparatus in supercritical fluid chromatography system, be made up of counterbalance valve main body 1, diaphragm 5, spring 6, push rod 7, stepper motor 8, pressure control unit 9 and pressure transducer 10.Counterbalance valve main body 1 is provided with outlet 2, threaded hole 3 and import 4; Outlet 2 and import 4 are coaxially positioned at the counterbalance valve main body left and right sides, and threaded hole 3 is positioned at bottom counterbalance valve main body 1; It is inner that diaphragm 5 is placed in counterbalance valve main body 1, and upper end is connected with spring 6, and push rod 7 is placed in counterbalance valve main body 1 upper end, and lower end contacts with spring 6; Stepper motor 8 input shaft is connected with push rod 7 upper end, and push rod 7 can be driven to move up and down; Output terminal and the stepper motor 8 of pressure control unit 9 are electrically connected, and input end is connected with pressure transducer 10.
Central scope of the present utility model is, closed loop is regulated by sensor, pressure control unit, stepper motor and counterbalance valve decomposition pressure, fluid through import flow into counterbalance valve time can in counterbalance valve pipeline mineralization pressure, the pressure of inlet ductwork is detected in real time by sensor, pressure control unit is according to the force value control step motor action of inlet ductwork, stepper motor drives push rod knee-action, change the decrement of spring, diaphragm blocks or connects pipeline under the effect of spring force, and then the pressure of regulating system pipeline.
Compared with the counterbalance valve regulating pressure with traditional manual, the utility model adopts closed loop to control, and automatic Regulation is simple to operate, reliability is strong.
Accompanying drawing explanation
Fig. 1 is the structural representation of automatic back pressure apparatus.Wherein, 1, counterbalance valve main body 2, outlet 3, threaded hole 4, import 5, diaphragm 6, spring 7, push rod 8, stepper motor 9, pressure control unit 10, pressure transducer.
Embodiment
Composition graphs 1 describes specific implementation process of the present utility model in detail.Threaded hole 3 is for fixing automatic back pressure apparatus, under original state, be default one force value by pressure control unit 9, simultaneously pressure control unit 9 calculates decrement needed for spring 6 and control step motor 8 rotating, the output shaft of stepper motor 8 drives push rod 7 to move up and down, change the decrement of spring 6, diaphragm 5 blocks thus or connects pipeline.When there being fluid to flow into counterbalance valve main body 1 through import 4, mineralization pressure in counterbalance valve main body 1 pipeline, pressure transducer 10 detects the line pressure at import 4 place in real time, and itself and default force value compare by pressure control unit 9; When line pressure is larger than setup pressure value, pressure control unit 9 control step motor 8 reverses, and the output shaft of stepper motor 8 drives push rod 7 move upward and make spring elongates, diaphragm 5 conducting pipeline, and line pressure reduces, and fluid goes out to flow out through exporting 2; When line pressure is less than setup pressure value, pressure control unit 9 control step motor 8 rotates forward, and drives push rod 7 to move downward holddown spring, and diaphragm 5 blocks pipeline; When the line pressure at import 4 place equals setup pressure value, stepper motor 8 quits work.
Claims (1)
1. be applied to the automatic back pressure apparatus in supercritical fluid chromatography system, it is characterized in that: be made up of counterbalance valve main body (1), diaphragm (5), spring (6), push rod (7), stepper motor (8), pressure control unit (9) and pressure transducer (10); Counterbalance valve main body (1) is provided with outlet (2), threaded hole (3) and import (4); Outlet (2) and import (4) are coaxially positioned at the counterbalance valve main body left and right sides, and threaded hole (3) is positioned at counterbalance valve main body (1) bottom; It is inner that diaphragm (5) is placed in counterbalance valve main body (1), and upper end is connected with spring (6), and push rod (7) is placed in counterbalance valve main body (1) upper end, and lower end contacts with spring (6); Stepper motor (8) input shaft is connected with push rod (7) upper end, and push rod (7) can be driven to move up and down; The output terminal of pressure control unit (9) and stepper motor (8) are electrically connected and drive stepper motor (8) to carry out rotating according to transmitted signal, and input end is connected with pressure transducer (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420693912.7U CN204129018U (en) | 2014-11-19 | 2014-11-19 | A kind of automatic back pressure apparatus be applied in supercritical fluid chromatography system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420693912.7U CN204129018U (en) | 2014-11-19 | 2014-11-19 | A kind of automatic back pressure apparatus be applied in supercritical fluid chromatography system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204129018U true CN204129018U (en) | 2015-01-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420693912.7U Active CN204129018U (en) | 2014-11-19 | 2014-11-19 | A kind of automatic back pressure apparatus be applied in supercritical fluid chromatography system |
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| CN (1) | CN204129018U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107525876A (en) * | 2016-06-21 | 2017-12-29 | 江苏汉邦科技有限公司 | A kind of automatic back pressure regulator applied to supercritical fluid chromatography system |
-
2014
- 2014-11-19 CN CN201420693912.7U patent/CN204129018U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107525876A (en) * | 2016-06-21 | 2017-12-29 | 江苏汉邦科技有限公司 | A kind of automatic back pressure regulator applied to supercritical fluid chromatography system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 223005 No. 1-9, Jixian Road, Huai'an Economic Development Zone, Jiangsu Province Patentee after: Jiangsu Hanbang Technology Co.,Ltd. Address before: 223005 No. 1-9, Jixian Road, Huai'an Economic Development Zone, Jiangsu Province Patentee before: JIANGSU HANBON SCIENCE & TECHNOLOGY Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder |