CN114609313A - High-precision rapid temperature rise and fall system for portable VOC analyzer - Google Patents
High-precision rapid temperature rise and fall system for portable VOC analyzer Download PDFInfo
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- CN114609313A CN114609313A CN202210159570.XA CN202210159570A CN114609313A CN 114609313 A CN114609313 A CN 114609313A CN 202210159570 A CN202210159570 A CN 202210159570A CN 114609313 A CN114609313 A CN 114609313A
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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
- G01N30/50—Conditioning of the sorbent material or stationary liquid
- G01N30/52—Physical parameters
- G01N30/54—Temperature
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
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Abstract
The invention discloses a high-precision rapid temperature rise and fall system for a portable VOC analyzer, which comprises a capillary column, a heat insulation layer, an air inlet joint, an air outlet joint, a light alloy heating wire, a connecting wire, a miniature compression air pump and a hollow metal aluminum ring, wherein the capillary column is provided with a heat insulation layer; the capillary column and the light alloy heating wire are layered and closely wound on the hollow metal aluminum ring, the light alloy heating wire is tightly attached to the capillary column, and the heat insulation layer covers the outer layer of the closely wound hollow metal aluminum ring. Compared with the technology used by similar products in the industry, the rapid temperature rise and fall system reduces the product volume, lightens the product weight, improves the temperature control precision, accelerates the temperature rise and fall time, and obtains more accurate VOCs results. The invention can realize automatic rapid heating and rapid refrigeration of the measurement air chamber, effectively improve the temperature control precision, shorten the operation time of the instrument, solve the error problem of temperature on gas collection and measurement, and can be widely applied to the portable VOC analyzer.
Description
Technical Field
The invention belongs to the technical field of detection, and particularly relates to a high-precision rapid temperature rise and fall system for a portable VOC analyzer.
Background
VOCs (Volatile Organic Compounds) are a main atmospheric pollutant, and Volatile Organic Compounds refer to Compounds with boiling points of 50-90 ℃, have saturated vapor pressure of over 133.32Pa at room temperature, and exist in air in a vapor form at normal temperature.
The main components of the VOCs comprise hydrocarbons, halogenated hydrocarbons, oxygen hydrocarbons and nitrogen hydrocarbons, and the VOCs can be further divided into eight types according to different chemical structures: alkanes, aromatic hydrocarbons, alkenes, halocarbons, esters, aldehydes, ketones and others, most VOCs have unpleasant special odor and have toxic, irritant, teratogenic and carcinogenic effects, and especially benzene, toluene, formaldehyde and the like cause great harm to human health.
Therefore, the content of VOCs is an important index for monitoring the quality of the atmosphere, a VOC analyzer is required to be used for detection and analysis, at present, the VOC analyzer mostly adopts gas chromatography analysis, the requirement for measuring a gas chamber is that the gas chamber keeps low-temperature sampling in a refrigerating device during sampling, the gas chamber keeps high-temperature analysis in a heating device during analysis, the requirement for temperature is extremely high, the related volatile organic compounds volatilize due to the influence of the temperature, the read data is lower than the actual value of the volatile organic compounds in a box body, the error is large, and therefore the temperature of the VOC analyzer needs to be strictly controlled.
Disclosure of Invention
The purpose of the invention is as follows: in order to solve the defects of the prior art, the invention provides a high-precision rapid temperature rise and fall system for a portable VOC analyzer.
The technical scheme is as follows: a high-precision rapid temperature rise and drop system for a portable VOC analyzer comprises a capillary column, a heat insulation layer, an air inlet joint, an air outlet joint, a light alloy heating wire, a connecting wire, a miniature compressed air pump and a hollow metal aluminum ring;
the capillary column and the light alloy heating wire are layered and closely wound on the hollow metal aluminum ring, the light alloy heating wire is tightly attached to the capillary column, and the heat insulation layer covers the outer layer of the closely wound hollow metal aluminum ring; the two ends of the hollow metal aluminum ring are respectively provided with an air inlet joint and an air outlet joint; the miniature compressed air pump is connected with the air outlet joint through a connecting wire.
As an optimization: when the VOC chromatographic column heating system needs to be heated, the light alloy heating wire is tightly attached to the capillary column, the temperature of the capillary column can be quickly followed, the capillary column is heated by using a program to heat, the miniature compression air pump is closed, the heating temperature of the light alloy heating wire is controlled by using a temperature prediction algorithm, multi-stage temperature control can be realized by low-power direct current power supply, the heating structure and the volume are greatly reduced, and the temperature control precision is improved.
As an optimization: when the VOC chromatographic column heating system needs to be cooled, the control of the light alloy heating wire is closed, the miniature compression air pump is opened, and air rapidly enters the hollow metal aluminum ring from the air inlet joint and then flows out from the air outlet joint; because the capillary column is closely wound on the hollow metal aluminum ring, the capillary column can be rapidly cooled, and the speed of the normal-temperature air flowing into the hollow metal aluminum ring can be controlled by controlling the micro compression air pump through PWM, so that the rapid cooling control is realized.
Has the advantages that: compared with the technology used by similar products in the industry, the rapid temperature rise and fall system reduces the product volume, lightens the product weight, improves the temperature control precision, accelerates the temperature rise and fall time, and obtains more accurate VOCs results. The invention can realize automatic rapid heating and rapid refrigeration of the measurement air chamber, effectively improve the temperature control precision, shorten the operation time of the instrument, solve the error problem of temperature on gas collection and measurement, and can be widely applied to the portable VOC analyzer.
Drawings
Fig. 1 is a schematic diagram of the system structure of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below so that those skilled in the art can better understand the advantages and features of the present invention, and thus the scope of the present invention will be more clearly defined. The embodiments described herein are only a few embodiments of the present invention, rather than all embodiments, and all other embodiments that can be derived by one of ordinary skill in the art without inventive faculty based on the embodiments described herein are intended to fall within the scope of the present invention.
Examples
As shown in fig. 1, a high-precision rapid temperature rise and fall system for a portable VOC analyzer comprises a capillary column 1, a heat-insulating layer 2, an air inlet joint 3, an air outlet joint 4, a light alloy heating wire 5, a connecting wire 6, a miniature compression air pump 7 and a hollow metal aluminum ring 8;
the capillary column 1 and the light alloy heating wire 5 are closely wound on the hollow metal aluminum ring 8 in a layered manner, the light alloy heating wire 5 is tightly attached to the capillary column 1, and the heat-insulating layer 2 covers the outer layer of the closely wound hollow metal aluminum ring 8; the two ends of the hollow metal aluminum ring 8 are respectively provided with an air inlet joint 3 and an air outlet joint 4; the miniature compressed air pump 7 is connected with the air outlet joint 4 through a connecting wire 6.
When the VOC chromatographic column heating system needs to be heated, the light alloy heating wire 5 is tightly attached to the capillary column 1, the temperature of the capillary column 1 can be quickly followed, the capillary column 1 is heated by using a program to heat, the miniature compression air pump 7 is closed, the heating temperature of the light alloy heating wire 5 is controlled by using a temperature prediction algorithm, multi-stage temperature control can be realized by low-power direct current power supply, the heating structure and the volume are greatly reduced, and the temperature control precision is improved.
When the VOC chromatographic column heating system needs to be cooled, the control of the light alloy heating wire 5 is closed, the miniature compression air pump 7 is opened, and air rapidly enters the hollow metal aluminum ring 8 from the air inlet joint 3 and then flows out from the air outlet joint 4; because the capillary column 1 is closely wound on the hollow metal aluminum ring 8, the capillary column 1 can be rapidly cooled, and the speed of the normal-temperature air flowing into the hollow metal aluminum ring 8 can be controlled by controlling the micro compression air pump 7 through PWM, so that the rapid cooling control is realized.
Compared with the technology used by similar products in the industry, the rapid temperature rise and fall system reduces the product volume, lightens the product weight, improves the temperature control precision, accelerates the temperature rise and fall time, and obtains more accurate VOCs results. The invention can realize automatic rapid heating and rapid refrigeration of the measurement air chamber, effectively improve the temperature control precision, shorten the running time of the instrument, solve the error problem of temperature on gas collection and measurement, and can be widely applied to the portable VOC analyzer.
Claims (3)
1. The utility model provides a high accuracy system of heating and cooling fast for portable VOC analysis appearance which characterized in that: comprises a capillary column (1), a heat-insulating layer (2), an air inlet joint (3), an air outlet joint (4), a light alloy heating wire (5), a connecting wire (6), a miniature compressed air pump (7) and a hollow metal aluminum ring (8);
the capillary column (1) and the light alloy heating wire (5) are closely wound on the hollow metal aluminum ring (8) in a layered manner, the light alloy heating wire (5) is tightly attached to the capillary column (1), and the heat-insulating layer (2) covers the outer layer of the closely wound hollow metal aluminum ring (8); the two ends of the hollow metal aluminum ring (8) are respectively provided with an air inlet joint (3) and an air outlet joint (4); the miniature compression air pump (7) is connected with the air outlet joint (4) through a connecting wire (6).
2. The high precision rapid warming and cooling system for a portable VOC analyzer according to claim 1, wherein: when the VOC chromatographic column heating system needs to be heated, the light alloy heating wire (5) is tightly attached to the capillary column (1), the temperature of the capillary column (1) can be quickly followed, the capillary column (1) is heated by using a programmed heating process, the miniature compression air pump (7) is closed, the heating temperature of the light alloy heating wire (5) is controlled by using a temperature prediction algorithm, and multi-stage temperature control can be realized by low-power direct current power supply, so that the heating structure and the volume are greatly reduced, and the temperature control precision is improved.
3. The high precision rapid warming and cooling system for a portable VOC analyzer according to claim 1, wherein: when the VOC chromatographic column heating system needs to be cooled, the control of the light alloy heating wire (5) is closed, the miniature compressed air pump (7) is opened, and air rapidly enters the hollow metal aluminum ring (8) from the air inlet joint (3) and then flows out from the air outlet joint (4); as the capillary column (1) is closely wound on the hollow metal aluminum ring (8), the capillary column (1) can be rapidly cooled, and the speed of the normal-temperature air flowing into the hollow metal aluminum ring (8) can be controlled by controlling the micro compression air pump (7) through PWM, so that the rapid cooling control is realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210159570.XA CN114609313A (en) | 2022-02-22 | 2022-02-22 | High-precision rapid temperature rise and fall system for portable VOC analyzer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210159570.XA CN114609313A (en) | 2022-02-22 | 2022-02-22 | High-precision rapid temperature rise and fall system for portable VOC analyzer |
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| CN114609313A true CN114609313A (en) | 2022-06-10 |
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| CN202210159570.XA Pending CN114609313A (en) | 2022-02-22 | 2022-02-22 | High-precision rapid temperature rise and fall system for portable VOC analyzer |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| RU2237894C1 (en) * | 2003-07-09 | 2004-10-10 | Коденев Геннадий Георгиевич | Separation unit for portable gas chromatograph |
| CN201903535U (en) * | 2010-11-30 | 2011-07-20 | 中国科学院大连化学物理研究所 | Chromatographic column rapid-heating device |
| CN103424495A (en) * | 2013-08-15 | 2013-12-04 | 上海冷杉精密仪器有限公司 | Chromatographic column heating device for gas chromatograph |
| CN203705412U (en) * | 2014-02-24 | 2014-07-09 | 天津七一二通信广播有限公司 | Chromatographic column heater and column box structure |
| CN104090053A (en) * | 2013-12-18 | 2014-10-08 | 力合科技（湖南）股份有限公司 | Gas chromatograph and chromatographic column device thereof |
| CN104407080A (en) * | 2014-12-08 | 2015-03-11 | 同方威视技术股份有限公司 | Portable gas chromatographic capillary column module |
| US20160341695A1 (en) * | 2014-12-31 | 2016-11-24 | Nuctech Company Limited | Gas analyzing apparatus and sampling device |
| CN110596289A (en) * | 2019-10-17 | 2019-12-20 | 钢研纳克检测技术股份有限公司 | Chromatographic column device capable of rapidly increasing and decreasing temperature |
| CN113804809A (en) * | 2021-09-26 | 2021-12-17 | 上海裕达实业有限公司 | Portable gas chromatography-mass spectrometer rapid temperature control device |
-
2022
- 2022-02-22 CN CN202210159570.XA patent/CN114609313A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2237894C1 (en) * | 2003-07-09 | 2004-10-10 | Коденев Геннадий Георгиевич | Separation unit for portable gas chromatograph |
| CN201903535U (en) * | 2010-11-30 | 2011-07-20 | 中国科学院大连化学物理研究所 | Chromatographic column rapid-heating device |
| CN103424495A (en) * | 2013-08-15 | 2013-12-04 | 上海冷杉精密仪器有限公司 | Chromatographic column heating device for gas chromatograph |
| CN104090053A (en) * | 2013-12-18 | 2014-10-08 | 力合科技（湖南）股份有限公司 | Gas chromatograph and chromatographic column device thereof |
| CN203705412U (en) * | 2014-02-24 | 2014-07-09 | 天津七一二通信广播有限公司 | Chromatographic column heater and column box structure |
| CN104407080A (en) * | 2014-12-08 | 2015-03-11 | 同方威视技术股份有限公司 | Portable gas chromatographic capillary column module |
| US20160341695A1 (en) * | 2014-12-31 | 2016-11-24 | Nuctech Company Limited | Gas analyzing apparatus and sampling device |
| CN110596289A (en) * | 2019-10-17 | 2019-12-20 | 钢研纳克检测技术股份有限公司 | Chromatographic column device capable of rapidly increasing and decreasing temperature |
| CN113804809A (en) * | 2021-09-26 | 2021-12-17 | 上海裕达实业有限公司 | Portable gas chromatography-mass spectrometer rapid temperature control device |
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