CN103399110A - Backpressure-adjustable flow cell design for ultraviolet spectrometry detector - Google Patents
Backpressure-adjustable flow cell design for ultraviolet spectrometry detector Download PDFInfo
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- CN103399110A CN103399110A CN2013103064621A CN201310306462A CN103399110A CN 103399110 A CN103399110 A CN 103399110A CN 2013103064621 A CN2013103064621 A CN 2013103064621A CN 201310306462 A CN201310306462 A CN 201310306462A CN 103399110 A CN103399110 A CN 103399110A
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Abstract
The invention discloses a backpressure-adjustable flow cell for an ultraviolet spectrometry detector. The backpressure-adjustable flow cell comprises a cell body, wherein a liquid input end, a liquid output end and an aperture are formed in the cell body, lens installation holes are processed in two ends of the aperture, a sealing gasket, a plano-convex lens, a clamping cap and housing pins are sequentially mounted into the lens installation holes, and the housing pins are tightly screwed. A liquid output end of the cell body has a backpressure-adjusting mechanism installation hole, a pressure-adjusting knob is screwed into the backpressure-adjusting mechanism installation hole to fix a backpressure-adjusting mechanism into the backpressure-adjusting mechanism installation hole, a bottom hole of the backpressure-adjusting mechanism installation hole is of an inner conical surface structure, small holes are formed at the top end of the conical surface, and communicated with the aperture of the cell body, side holes are formed in the bottom edge of the conical surface, and the backpressure-adjusting mechanism comprises a backpressure core, an O-shaped ring and a spring. According to the backpressure-adjustable flow cell, numerical values of pressure inside the cell body can be controlled by adjusting the pressure-adjusting knob, and the pressure is kept stable under the action of the spring, and therefore, the purpose of adjusting the pressure formed after liquid flows through the flow cell is achieved.
Description
Technical field
The present invention relates to a kind of ultraviolet spectrometry detecting device that is applicable to high performance liquid chromatograph, flow cell is the optical detection part of this detection, has increased the back adjustable pressure device, has better improved stability and the reliability of ultraviolet spectrometry detecting device.
Technical background
Liquid chromatography technology, with its adaptability widely, becomes one of the most frequently used analytical approach in laboratory.The instrument of its test is high performance liquid chromatograph, and the ultraviolet spectrometry detecting device is a core component of high performance liquid chromatograph, at all, is applicable in the detecting device of liquid phase systems, and the ultraviolet spectrometry detecting device approximately occupies 70% ratio.The stability of the optic response of ultraviolet spectrometry detecting device and repeatability, directly affect the Major Systems indexs such as noise, repeatability and minimum detectable level of a whole set of instrument., by rational back pressure value is set, can effectively improve stability and the repeatability index of the optic response of ultraviolet spectrometry detecting device, thereby improve the system index of whole liquid phase systems.
Existing ultraviolet spectrometry detecting device, stream and light path design that the different producer of its flow cell adopts, but analyze its inner structure, all only have the optical detection part, be illustrated in figure 1 as wherein a kind of common design.During actual liquid chromatograph uses, often by one section thin diameter tube road of the access of the output interface at flow cell, for generation of back pressure.This way has two obvious problems: at first, the liquid of different volumes modulus is steadily exported the back pressure that needs and is not quite similar, and back pressure is non-adjustable can not meet all situations use; The abnormal situation of pipeline retaining pressure very easily occurs for the test of buffer salt system in the thin diameter tube road.In the present invention, the back adjustable pressure device can overcome the above problems.
Summary of the invention
The object of the invention is exactly in order to make up the defect of prior art, provides a kind of back adjustable for the ultraviolet spectrometry detecting device to press flow cell, and this flow cell can be regulated the pressure that forms when liquid flows through this flow cell.
The present invention is achieved by the following technical solutions:
A kind of back adjustable for the ultraviolet spectrometry detecting device is pressed flow cell, it is characterized in that: include the pond body, the pond body is provided with liquid input end, liquid output terminal, body middle part, pond is provided with unthreaded hole, liquid input end, unthreaded hole, liquid output terminal form the liquid road, the unthreaded hole two ends are processed with the eyeglass mounting hole, and eyeglass mounting hole inwall is screw thread, pack into successively eyeglass mounting hole and screw forcing screw of sealing gasket, plano-convex lens, friction top, forcing screw; The liquid output terminal of pond body is designed with the backpressure adjusting mechanism mounting hole, and the bottom outlet of backpressure adjusting mechanism mounting hole is the inner conical surface structure, and aperture is left on conical surface top, unthreaded hole UNICOM with the pond body, the base of the conical surface has side opening, is used for the output of liquid road, flows to the finally hole outflow thus of liquid of flow cell; Backpressure adjusting mechanism mounting hole inwall is helicitic texture, the backpressure adjusting mechanism of packing into, described backpressure adjusting mechanism includes back pressure core body, O type circle, the top of back pressure core body be the conical surface and with the bottom outlet inner conical surface fitted seal of backpressure adjusting mechanism mounting hole, the conical surface rear end of back pressure core body is fixed with O type circle, be set with spring on the back pressure core body, screw in and have pressure adjustment knob that backpressure adjusting mechanism is fixed in the backpressure adjusting mechanism mounting hole in the backpressure adjusting mechanism mounting hole.
Described a kind of back adjustable for the ultraviolet spectrometry detecting device is pressed flow cell, and it is characterized in that: described pond body is processed by the SS316L stainless steel.
Described a kind of back adjustable for the ultraviolet spectrometry detecting device is pressed flow cell, and it is characterized in that: described back pressure core body is the PEEK material.
Described a kind of back adjustable for the ultraviolet spectrometry detecting device is pressed flow cell, it is characterized in that: the groove that has designed assembling O type circle on the back pressure core body of described backpressure adjusting mechanism, O type circle can be filled the gap of back pressure core body and backpressure adjusting mechanism mounting hole straight hole part, guarantees that liquid can not flow to the position of spring and pressure adjustment knob.
Described a kind of back adjustable for the ultraviolet spectrometry detecting device is pressed flow cell, and it is characterized in that: described O type circle is selected the FFKM material.
Spring top between back pressure core body and pressure adjustment knob,, with being threaded, when this screw thread tightens and unscrews, can make and reduces between back pressure core body and pressure adjustment knob and increase between pressure adjustment knob and pond body.
Beneficial effect of the present invention is:
The present invention can control the numerical value of pond body internal pressure by adjusting pressure adjustment knob, and under the effect of spring, keeps stable, reaches back adjustable and presses flow cell, can regulate the pressure that forms when liquid flows through this flow cell.
Description of drawings:
Fig. 1 is the structural representation of existing flow cell.
Fig. 2 is overall sectional structure schematic diagram of the present invention.
Fig. 3 is broken section structural representation of the present invention.
Embodiment:
As shown in Figure 2,3, a kind of back adjustable for the ultraviolet spectrometry detecting device is pressed flow cell, include pond body 1, pond body 1 is provided with liquid input end, liquid output terminal, body 1 middle part in pond is provided with unthreaded hole, and liquid input end, unthreaded hole, liquid output terminal form the liquid road, and the unthreaded hole two ends are processed with the eyeglass mounting hole, eyeglass mounting hole inwall is screw thread, pack into successively eyeglass mounting hole and screw forcing screw of sealing gasket 5, plano-convex lens 2, friction top 3, forcing screw 4; The liquid output terminal of pond body 1 is designed with the backpressure adjusting mechanism mounting hole, and the bottom outlet of backpressure adjusting mechanism mounting hole is the inner conical surface structure, and aperture is left on conical surface top, unthreaded hole UNICOM with the pond body, the base of the conical surface has side opening, is used for the output of liquid road, flows to the finally hole outflow thus of liquid of flow cell; Backpressure adjusting mechanism mounting hole inwall is helicitic texture, the backpressure adjusting mechanism of packing into, described backpressure adjusting mechanism includes back pressure core body 8, O type circle 6, the top of back pressure core body 7 be the conical surface and with the bottom outlet inner conical surface fitted seal of backpressure adjusting mechanism mounting hole, the conical surface rear end of back pressure core body is fixed with O type circle 6, be set with spring 7 on back pressure core body 8, screw in and have pressure adjustment knob 9 that backpressure adjusting mechanism is fixed in the backpressure adjusting mechanism mounting hole in the backpressure adjusting mechanism mounting hole.
Pond body 1 is processed by the SS316L stainless steel.Back pressure core body 8 is the PEEK material.
Designed the groove of assembling O type circle on the back pressure core body 8 of backpressure adjusting mechanism, O type circle 6 can be filled the gap of back pressure core body 8 and backpressure adjusting mechanism mounting hole straight hole part, guarantees that liquid can not flow to the position of spring 7 and pressure adjustment knob 9.O type circle 6 is selected the FFKM material.
During a whole set of liquid phase systems operation, there is liquid to flow through in flow cell, the flow through absorbance of liquid of Real-Time Monitoring always.
Liquid flows into from the liquid input end of pond body 1, and the unthreaded hole of flowing through, to the liquid input end.Have light to pass through in unthreaded hole, when the liquid of flowing through had absorption to the light that passes, the light intensity of its output can reduce, and calculated thus absorbance.
As shown in Figure 2, at the unthreaded hole output terminal, be connected to backpressure adjusting mechanism,, due to the pressure of spring 7, make back pressure core body 8 be pressed on above the inner cone bottom outlet of backpressure adjusting mechanism mounting hole always, make the liquid of flow cell not flow out.
Along with the amount of liquid that flows into pond body 1 constantly increases, body 1 internal liquid pressure in pond increases.This pressure can be applied to the conical surface top of back pressure core body 8, pressure is during greater than the elastic force of spring 7, back pressure core body 8 can move down under the promotion of pressure, opened thus the liquid output channel of pond body 1, makes the side opening of the backpressure adjusting mechanism mounting hole of liquid from Fig. 2 discharge.Along with liquid is discharged, body 1 internal liquid pressure in pond can reduce, and to less than the elastic force of spring 7 time, back pressure core body 8 can move up under the promotion of spring 7 elastic force when pressure decreased, seal thus the liquid output channel of pond body 1, made liquid in the inner gathering of pond body 1.So circulation can reach pond body 1 internal pressure and spring 7 elastic force mobile equilibrium, and body 1 internal pressure in pond can keep consistent with spring force, reaches thus the constant backpressure function.
As shown in Figure 2, between pressure adjustment knob 9 and pond body 1 with being threaded, when this screw thread tightens and unscrews, can make between back pressure core body 8 and pressure adjustment knob 9 and reduce and increase, be applied on spring 7 is exactly to compress and releasing spring, according to Hooke's law, the elastic force that can draw spring 7 can increase thereupon or reduce, and namely pressure adjustment knob 9 tightens and unscrew the size of regulating spring 7 elastic force in real time.Known pond body 1 internal pressure and spring 7 elastic force meeting mobile equilibrium again, body 1 internal pressure in pond can keep consistent with spring force.So can control the numerical value of pond body 1 internal pressure by adjusting pressure adjustment knob 9, and under the effect of spring 7, keep stable, reach back adjustable and press flow cell.
Claims (5)
1. a back adjustable that is used for the ultraviolet spectrometry detecting device is pressed flow cell, it is characterized in that: include the pond body, the pond body is provided with liquid input end, liquid output terminal, body middle part, pond is provided with unthreaded hole, liquid input end, unthreaded hole, liquid output terminal form the liquid road, the unthreaded hole two ends are processed with the eyeglass mounting hole, and eyeglass mounting hole inwall is screw thread, pack into successively eyeglass mounting hole and screw forcing screw of sealing gasket, plano-convex lens, friction top, forcing screw; The liquid output terminal of pond body is designed with the backpressure adjusting mechanism mounting hole, and the bottom outlet of backpressure adjusting mechanism mounting hole is the inner conical surface structure, and aperture is left on conical surface top, and with the unthreaded hole UNICOM of pond body, the base of the conical surface has side opening, is used for the output of liquid road; Backpressure adjusting mechanism mounting hole inwall is helicitic texture, the backpressure adjusting mechanism of packing into, described backpressure adjusting mechanism includes back pressure core body, O type circle, the top of back pressure core body be the conical surface and with the bottom outlet inner conical surface fitted seal of backpressure adjusting mechanism mounting hole, the conical surface rear end of back pressure core body is fixed with O type circle, be set with spring on the back pressure core body, screw in and have pressure adjustment knob that backpressure adjusting mechanism is fixed in the backpressure adjusting mechanism mounting hole in the backpressure adjusting mechanism mounting hole.
2. a kind of back adjustable for the ultraviolet spectrometry detecting device according to claim 1 is pressed flow cell, and it is characterized in that: described pond body is processed by the SS316L stainless steel.
3. a kind of back adjustable for the ultraviolet spectrometry detecting device according to claim 1 is pressed flow cell, and it is characterized in that: described back pressure core body is the PEEK material.
4. a kind of back adjustable for the ultraviolet spectrometry detecting device according to claim 1 is pressed flow cell, it is characterized in that: the groove that has designed assembling O type circle on the back pressure core body of described backpressure adjusting mechanism, O type circle can be filled the gap of back pressure core body and backpressure adjusting mechanism mounting hole straight hole part, guarantees that liquid can not flow to the position of spring and pressure adjustment knob.
5. a kind of back adjustable for the ultraviolet spectrometry detecting device according to claim 1 is pressed flow cell, and it is characterized in that: described O type circle is selected the FFKM material.
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| CN201310306462.1A CN103399110B (en) | 2013-07-19 | 2013-07-19 | The design of a kind of pressure of the back adjustable for ultraviolet spectrometry detecting device flow cell |
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| CN201310306462.1A CN103399110B (en) | 2013-07-19 | 2013-07-19 | The design of a kind of pressure of the back adjustable for ultraviolet spectrometry detecting device flow cell |
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| CN103399110B CN103399110B (en) | 2015-12-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109932450A (en) * | 2019-04-03 | 2019-06-25 | 安徽皖仪科技股份有限公司 | Flow cell and liquid chromatograph with it |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109932450A (en) * | 2019-04-03 | 2019-06-25 | 安徽皖仪科技股份有限公司 | Flow cell and liquid chromatograph with it |
| US11378559B2 (en) | 2019-04-03 | 2022-07-05 | Anhui Wayee Science and Technology Co., Ltd. | Flow cell and liquid chromatographic unit having same |
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| CN103399110B (en) | 2015-12-23 |
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Address after: High tech Zone Wenqu 230088 Hefei Road, Anhui province No. 8 Patentee after: ANHUI WANYI SCIENCE & TECHNOLOGY Co.,Ltd. Address before: Tianda high tech Zone 230088 Hefei Road, Anhui province No. 71 Huayi Science Park building B building Anhui instrument Patentee before: ANHUI WANYI SCIENCE & TECHNOLOGY Co.,Ltd. |