CN112992647A - Airflow preheating assembly applied to separation analysis instrument and application - Google Patents
Airflow preheating assembly applied to separation analysis instrument and application Download PDFInfo
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- CN112992647A CN112992647A CN201911275068.XA CN201911275068A CN112992647A CN 112992647 A CN112992647 A CN 112992647A CN 201911275068 A CN201911275068 A CN 201911275068A CN 112992647 A CN112992647 A CN 112992647A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J49/00—Particle spectrometers or separator tubes
- H01J49/02—Details
- H01J49/04—Arrangements for introducing or extracting samples to be analysed, e.g. vacuum locks; Arrangements for external adjustment of electron- or ion-optical components
- H01J49/0468—Arrangements for introducing or extracting samples to be analysed, e.g. vacuum locks; Arrangements for external adjustment of electron- or ion-optical components with means for heating or cooling the sample
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J49/00—Particle spectrometers or separator tubes
- H01J49/02—Details
- H01J49/04—Arrangements for introducing or extracting samples to be analysed, e.g. vacuum locks; Arrangements for external adjustment of electron- or ion-optical components
- H01J49/0422—Arrangements for introducing or extracting samples to be analysed, e.g. vacuum locks; Arrangements for external adjustment of electron- or ion-optical components for gaseous samples
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Abstract
The airflow preheating assembly for separating and analyzing instrument consists of one integrated hollow sealed cavity, and the sealed cavity consists of three kinds of heat conducting assemblies of different structures and is divided into two different flow areas. The room temperature air or the clean air flow enters the buffering and shunting area through two threaded holes (air inlets) on one side of the closed cavity, is preheated primarily through the columnar body, naturally shunts through the diversion baffle plate and is injected into the component diffusion area, and flows out from one threaded hole (air outlet) on the other side of the cavity after fully contacting and exchanging heat with the radiating fins on the side wall surface of the columnar body. The columnar body has both axial contact area and transverse diffusion area, and the radiating fins wrapped on the periphery of the columnar body can increase the contact area, improve the heat conduction efficiency, ensure that the airflow is heated to the expected temperature of the cavity, and realize the function of preheating the airflow. The airflow preheating assembly has high heat conduction efficiency, stable flow, small pressure loss and controllable temperature, and is suitable for the technology of preheating, separating and analyzing air or clean gas.
Description
Technical Field
The invention relates to the technical fields of precision machinery manufacturing, hydromechanics, thermodynamics and the like, in particular to an airflow preheating assembly applied to a separation and analysis instrument.
Background
The Ion Mobility Spectrometry (IMS) technology is a separation, analysis and detection technology appearing in the middle and later stages of the 20 th century, and compared with the traditional mass Spectrometry and chromatography instruments, the Ion Mobility Spectrometry and detection technology has the characteristics of simple system, low detection limit, high response speed and stable performance. The method can detect trace substances in a normal pressure environment, and is suitable for real-time monitoring. The working condition is not vacuum condition, but normal atmospheric pressure condition, the air flow of the instrument running is lower than 2ksccm, the air flow is distributed and controlled by the air flow generating device, the total air flow is divided into three parts of 'floating air', 'carrier air', 'reagent doping air', and the air flow can assist in participating in the processes of molecular ion movement, sample loading, chemical ionization and the like.
During operation and analysis of the ion mobility spectrometry instrument, preheating control needs to be performed on air flow entering the migration tube, the purpose of preheating the air flow is to improve the resolution of a sample substance to be detected, and the preheated air flow entering the migration tube to participate in molecular ion reaction is effective in improving the resolution of the sample substance to be detected. However, the preheating gas flow to be described in this invention is a partial gas flow: the 'floating gas', the rest 'carrier gas' and 'reagent doping gas' have another preheating method. There are many conventional methods for preheating the gas stream, but most methods have the disadvantages of being single in construction, bulky, inefficient in heat transfer, and the like.
The invention relates to an air flow heating module for a front end module of equipment (patent application number 201720707330.3), which comprises a first hole plate used as a plurality of first holes of an air flow inlet; a second hole plate for serving as a plurality of second holes of the airflow outlet; and the heating component is arranged between the first hole plate and the second hole plate and comprises a plurality of heaters, and each of the plurality of heaters comprises a heating rod and a fin. The design is bulky, the construction components are fragmented, and there is no air flow splitting and guiding function.
An air flow preheating device (patent application No. 201510233789.X) invented by Chenjiatai et al, said invention provides an air flow preheating device, including an air flow channel, one end of said air flow channel is equipped with an air inlet; the other end is provided with an air outlet; a heating device for heating the gas flowing in the gas flow channel is arranged in the gas flow channel section; but the adopted airflow channel is too simple, and the heat conduction efficiency of the heating device is not high.
The invention designs the heat conduction structure, the flow guide baffle, the thermodynamics and other technologies in an integrated manner, and discloses an airflow preheating assembly applied to a separation and analysis instrument. The airflow preheating assembly is high in heat conduction efficiency, stable in flow, small in pressure loss, controllable in temperature and suitable for the technology of preheating and separating analysis of airflow.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the heat conduction assembly comprises an integrated hollow closed cavity structure, three heat conduction assemblies with different structures and a flow distribution area design of an area. The room temperature air or the clean air flow enters the buffering and shunting area through two threaded holes (air inlets) on one side of the closed cavity, is preliminarily preheated through the columnar body, is naturally shunted and injected into the component diffusion area through the diversion baffle plate, fully contacts with the radiating fins on the side wall surface of the columnar body for heat exchange, flows out from one threaded hole (air outlet) on the other side of the cavity, ensures that the air flow is heated to the set temperature of the cavity, and realizes the air flow preheating function. The heat conduction efficiency is improved, the flow is stabilized, the pressure loss is reduced, and the temperature can be controlled.
The specific content comprises the following steps:
an airflow preheating assembly applied to a separation analysis instrument is composed of an integrated hollow closed cavity;
wherein, the side wall surface of the front end of the cavity is provided with an air inlet, the side wall surface of the rear end is provided with an air outlet, a first flow guide baffle plate is arranged in the cavity close to the air inlet, the upper end and the lower end of the first flow guide baffle plate are respectively hermetically connected with the upper inner wall surface and the lower inner wall surface of the cavity, and a gap is reserved between the upper inner wall surface and the lower inner wall surface of the cavity; and the upper end and the lower end of the third flow guide baffle are respectively hermetically connected with the upper inner wall surface and the lower inner wall surface of the cavity and a gap is reserved between the upper end and the lower end of the third flow guide baffle and the right inner wall surface of the cavity.
More than 2 columnar bodies are arranged in the cavity, the upper end face and the lower end face of each columnar body are respectively connected with the upper inner wall face and the lower inner wall face of the cavity in a sealing mode, more than 2 annular through holes which penetrate and sleeve are formed between the upper end face and the lower end face of each columnar body in sequence, the geometric center line of more than 2 annular through holes is overlapped with the geometric center line of each columnar body from top to bottom, two or three strip-shaped through holes which are crossed with each other are formed between the upper end face and the lower end face of each columnar body and are intersected to form a square columnar through hole or a hexagonal columnar through hole, the geometric center line of each through hole from top to bottom is overlapped with the geometric center line of.
Wherein, the side wall surface of all or part of the columnar body is provided with a radiating fin which is spirally wound on the side wall surface of the columnar body from top to bottom.
The second flow guide baffle and the third flow guide baffle divide the cavity into a buffer flow distribution area close to the air inlet and a component diffusion area close to the air outlet, room temperature air or clean air flow enters the buffer flow distribution area through two threaded holes (air inlets) on one side of the closed cavity, is preliminarily preheated through the columnar body, is naturally distributed and injected into the component diffusion area through the flow guide baffles, and flows out from one threaded hole (air outlet) on the other side of the cavity after being fully contacted with the radiating fins on the side wall surface of the columnar body for heat exchange.
Wherein, the component does not use a sealing rubber ring such as nitrile, fluorine rubber, silicon rubber and the like, and is an integrally formed closed cavity.
Wherein, the material of the closed cavity is metal with high heat conduction efficiency, such as: aluminum and copper, but are not limited to these metals.
Wherein, the closed cavity and the internal structure adopt the additive manufacturing technology to manufacture the metal powder material layer by layer.
Wherein, 3 annular through holes which are sequentially penetrated and sleeved are arranged between the upper end surface and the lower end surface of each cylindrical body, two strip-shaped through holes which are mutually crossed are arranged between the upper end surface and the lower end surface of each cylindrical body, each cylindrical body is composed of 4 circular ring columns which are provided with 4 gaps, have diameters of 0.5mm, 1.5mm, 2.5mm and 3.5mm and are 5mm in height, the wall thickness of each circular ring is 0.25mm, and the width of each gap is 0.2-0.3 mm.
Wherein, the transverse distance between the adjacent columnar bodies is 6mm, and the longitudinal distance is 5 mm.
The section of the first flow guide baffle plate parallel to the upper end face is V-shaped, the opening end of the V-shape faces the wall face where the air inlet is located, and the angle of the V-shape is 118-120 degrees; one ends of the second flow guide baffle and the third flow guide baffle, which are far away from the connecting wall surface, are bent towards one side of the wall surface where the air inlet is positioned, and the angle is 118-120 degrees.
Wherein, the radiating fins are attached to the side wall surface of the columnar body, the thread pitch of the radiating fins is 0.8-1mm, the number of turns of the radiating fins is 5-6, the initial angle is 50-90 degrees, and the spiral direction is clockwise or anticlockwise.
The columnar body has both axial contact area and transverse diffusion area, and the radiating fins wrapped on the periphery of the columnar body have the functions of increasing the contact area and improving the heat conduction efficiency.
The first guide baffle blocks the entering air flow, so that the entering air flow is diffused to two sides and then compressed by the second guide baffle and the third guide baffle, and the two layers of guide baffles are used for uniformly mixing the air flow and shunting the air flow.
Wherein, be equipped with hot plate and temperature sensor on the recess wall of cavity bottom, hot plate and temperature sensor link to each other with temperature controller respectively for cavity heating and temperature control. The heating plate can be one or two of a silica gel heating plate or a polyimide insulating heating plate; the temperature sensor can be one or more than two of K-type or other-type thermocouples or PT100 thermistors; the heating plate and the temperature sensor can be of a split type or an integrated type; one surface of the heating plate is fully contacted with the wall surface of the groove at the bottom of the cavity by using heat-conducting silicone grease (the heat conductivity coefficient is more than 11W/(m.k)), and redundant air is removed.
Wherein, two threaded holes (air inlets) on one side of the airflow preheating assembly are matched with 2M 3/5/6 and other specifications of quick change connectors (made of metal), 2 tetrafluoro hoses are led out and connected with the tetrafluoro hose at the air outlet of the flow-controllable gas generating device through a Y-shaped 3-way quick change adapter;
and a threaded hole (air outlet) on the other side of the airflow preheating assembly is matched with 1 quick-change connector (made of metal) with the specification of M3/5/6 and the like, 1 tetrafluoro hose is led out, and the tetrafluoro hose is connected with an external thread steel pipe of a migration pipe in a separation analysis instrument, wherein the external thread steel pipe needs to preheat an air inlet.
Drawings
The models in the figures of the present invention are merely exemplary and are not drawn to scale.
FIG. 1 is a schematic cross-sectional view of a gas flow preheating assembly;
FIG. 2 is a schematic view of a cylinder structure in the gas flow preheat assembly;
FIG. 3 is a schematic view of a structure of a column surrounding a heat sink in an airflow preheating assembly;
FIG. 4 is a schematic view of a groove structure at the bottom of the airflow preheating assembly;
in fig. 1-4, "1" is a cylindrical structure, "2" is a flow guide baffle, "3" is a cylindrical surrounding wrapping heat sink, "4" is an airflow inlet (with threads), "5" is an airflow outlet (with threads), "6" is a cylindrical circular column, "7" is a heat sink attached to the cylindrical surface, and "8" is a heating plate embedding groove.
Detailed Description
An airflow preheating assembly applied to a separation analysis instrument is composed of an integrated hollow closed cavity;
wherein, the side wall surface of the front end of the cavity is provided with an air inlet, the side wall surface of the rear end is provided with an air outlet, a first flow guide baffle plate is arranged in the cavity close to the air inlet, the upper end and the lower end of the first flow guide baffle plate are respectively hermetically connected with the upper inner wall surface and the lower inner wall surface of the cavity, and a gap is reserved between the upper inner wall surface and the lower inner wall surface of the cavity; and the upper end and the lower end of the third flow guide baffle are respectively hermetically connected with the upper inner wall surface and the lower inner wall surface of the cavity and a gap is reserved between the upper end and the lower end of the third flow guide baffle and the right inner wall surface of the cavity.
More than 2 columnar bodies are arranged in the cavity, the upper end face and the lower end face of each columnar body are respectively connected with the upper inner wall face and the lower inner wall face of the cavity in a sealing mode, more than 2 annular through holes which penetrate and sleeve are formed between the upper end face and the lower end face of each columnar body in sequence, the geometric center line of more than 2 annular through holes is overlapped with the geometric center line of each columnar body from top to bottom, two or three strip-shaped through holes which are crossed with each other are formed between the upper end face and the lower end face of each columnar body and are intersected to form a square columnar through hole or a hexagonal columnar through hole, the geometric center line of each through hole from top to bottom is overlapped with the geometric center line of.
Wherein, the side wall surface of all or part of the columnar body is provided with a radiating fin which is spirally wound on the side wall surface of the columnar body from top to bottom.
The second flow guide baffle and the third flow guide baffle divide the cavity into a buffer flow distribution area close to the air inlet and a component diffusion area close to the air outlet, room temperature air or clean air flow enters the buffer flow distribution area through two threaded holes (air inlets) on one side of the closed cavity, is preliminarily preheated through the columnar body, is naturally distributed and injected into the component diffusion area through the flow guide baffles, and flows out from one threaded hole (air outlet) on the other side of the cavity after being fully contacted with the radiating fins on the side wall surface of the columnar body for heat exchange.
Wherein, 3 annular through holes which are sequentially penetrated and sleeved are arranged between the upper end surface and the lower end surface of each cylindrical body, two strip-shaped through holes which are mutually crossed are arranged between the upper end surface and the lower end surface of each cylindrical body, each cylindrical body is composed of 4 circular ring columns which are provided with 4 gaps, have diameters of 0.5mm, 1.5mm, 2.5mm and 3.5mm and are 5mm in height, the wall thickness of each circular ring is 0.25mm, and the width of each gap is 0.2-0.3 mm. The transverse distance between the adjacent columnar bodies is 6mm, and the longitudinal distance is 5 mm.
Wherein the complete contact area of the single columnar body is 242mm2The total of 33 contact areas is 7986mm2。
The section of the first flow guide baffle plate parallel to the upper end face is V-shaped, the opening end of the V-shape faces the wall face where the air inlet is located, and the angle of the V-shape is 118-120 degrees; one ends of the second flow guide baffle and the third flow guide baffle, which are far away from the connecting wall surface, are bent towards one side of the wall surface where the air inlet is positioned, and the angle is 118-120 degrees.
Wherein, the total sum of the complete contact area of the diversion baffle and the inner periphery of the closed cavity is 1375mm 2.
Wherein, the radiating fins are attached to the side wall surface of the columnar body, the thread pitch of the radiating fins is 0.8-1mm, the number of turns of the radiating fins is 5-6, the initial angle is 50-90 degrees, and the spiral direction is clockwise or anticlockwise.
Wherein the complete contact area of the radiating fins wrapped on the periphery of the single columnar body is 405mm2The total of 18 contact areas is 7290mm2。
Wherein the total contact area of the upper and lower bottom surfaces of the sealed cavity is 3324mm2。
Wherein, be equipped with hot plate and temperature sensor on the recess wall of cavity bottom, hot plate and temperature sensor link to each other with temperature controller respectively for cavity heating and temperature control. The heating plate can be one or two of a silica gel heating plate or a polyimide insulating heating plate; the temperature sensor can be one or more than two of K-type or other-type thermocouples or PT100 thermistors; the heating plate and the temperature sensor can be of a split type or an integrated type; one surface of the heating plate is fully contacted with the wall surface of the groove at the bottom of the cavity by using heat-conducting silicone grease (the heat conductivity coefficient is more than 11W/(m.k)), and redundant air is removed.
Example 1
The columnar body in the airflow preheating assembly has both axial contact area and transverse diffusion area, and the radiating fins wrapped on the periphery of the columnar body have the functions of increasing the contact area and improving the heat conduction efficiency. One surface of the heating plate is fully contacted with the wall surface of the groove at the bottom of the cavity by using heat-conducting silicone grease (the heat conductivity coefficient is more than 11W/(m.k)), and redundant air is removed. Two threaded holes of an air inlet are matched with 2M 3/5/6 standard quick-change connectors (made of metal), 2 PTFE hoses are led out and connected with the PTFE hose at the air outlet of the flow-controllable gas generating device through a Y-shaped 3-way quick-change connector; one threaded hole is matched with 1 quick-change connector (made of metal) with the specification of M3/5/6 and the like, and 1 tetrafluoro hose is led out.
The heating temperature of the heating plate is set to be 50 ℃, the temperature of the air flow at the air inlet is measured to be 25 ℃ by a thermometer, the temperature of the air flow at the air outlet is measured to be 50 ℃ by the thermometer, and the heating set temperature is consistent with the temperature of the air flow at the air outlet, namely the heat conduction efficiency is high. (Note: the flow range of the gas stream is less than 2ksccm)
Example 2
The columnar body in the airflow preheating assembly has both axial contact area and transverse diffusion area, and the radiating fins wrapped on the periphery of the columnar body have the functions of increasing the contact area and improving the heat conduction efficiency. One surface of the heating plate is fully contacted with the wall surface of the groove at the bottom of the cavity by using heat-conducting silicone grease (the heat conductivity coefficient is more than 11W/(m.k)), and redundant air is removed. Two threaded holes of an air inlet are matched with 2M 3/5/6 standard quick-change connectors (made of metal), 2 PTFE hoses are led out and connected with the PTFE hose at the air outlet of the flow-controllable gas generating device through a Y-shaped 3-way quick-change connector; one threaded hole is matched with 1 quick-change connector (made of metal) with the specification of M3/5/6 and the like, and 1 tetrafluoro hose is led out.
Setting the heating temperature of the heating plate to be 70 ℃, and measuring the temperature of air flow at an air outlet to be 70 ℃ by using a thermometer;
setting the heating temperature of the heating plate to be 100 ℃, and measuring the air flow temperature of the air outlet to be 100 ℃ by using a thermometer;
the heating set temperature is consistent with the temperature of the air flow at the air outlet, and the heating temperature can be controlled at will.
Example 3
The upper end surface and the lower end surface of each cylindrical body in the airflow preheating assembly are provided with 3 annular through holes which are sequentially penetrated and sleeved, and the upper end surface and the lower end surface of each cylindrical body are provided with two strip-shaped through holes which are intersected with each other, so that each cylindrical body is composed of 4 circular ring columns with 4 gaps, the diameters of the circular ring columns are respectively 0.5mm, 1.5mm, 2.5mm and 3.5mm, the height of the circular ring columns is 5mm, the wall thickness of the circular ring columns is 0.25mm, and the width of the gaps is 0.2-0.3 mm. The transverse distance between the adjacent columnar bodies is 6mm, and the longitudinal distance is 5 mm. The radiating fins are attached to the side wall surface of the columnar body, the thread pitch of the radiating fins is 0.8-1mm, the number of turns of the radiating fins is 5-6, and the initial angle is 50-90 degrees. Two threaded holes of an air inlet are matched with 2M 3/5/6 standard quick-change connectors (made of metal), 2 PTFE hoses are led out and connected with the PTFE hose at the air outlet of the flow-controllable gas generating device through a Y-shaped 3-way quick-change connector; one threaded hole is matched with 1 quick-change connector (made of metal) with the specification of M3/5/6 and the like, and 1 tetrafluoro hose is led out.
Setting the gas flow of the gas outlet of the gas generating device, namely setting the gas flow of the gas inlet of the gas preheating assembly as follows: 500sccm, reading the gas flow rate at the gas outlet of the gas flow preheating assembly by using a flow controller as follows: 500 sccm.
Setting the gas flow of the gas outlet of the gas generating device, namely setting the gas flow of the gas inlet of the gas preheating assembly as follows: 1000sccm, reading the gas flow at the gas outlet of the gas flow preheating assembly by using a flow controller as follows: 1000 sccm.
Setting the gas flow of the gas outlet of the gas generating device, namely setting the gas flow of the gas inlet of the gas preheating assembly as follows: 1500sccm, read the gas flow rate at the gas outlet of the gas flow preheating assembly with a flow controller as follows: 1500 sccm.
The state is that the air inlet airflow and the air outlet airflow of the airflow preheating assembly are consistent, namely the flow inside the cavity is stable, and the pressure loss is small.
Although the present invention has been described in detail with reference to the preferred embodiments and the drawings for the purpose of clarity of understanding, it is to be understood that the embodiments are illustrative rather than restrictive. Also, various changes, improvements, modifications, and equivalents may be made by those skilled in the art without departing from the spirit and scope of the invention. It is understood, therefore, that the scope of the present invention is defined only by the appended claims.
Claims (10)
1. A gas flow preheating assembly applied to a separation analysis instrument is characterized in that:
the airflow preheating assembly consists of an integrated hollow closed cavity;
an air inlet is arranged on the side wall surface at the front end of the cavity, an air outlet is arranged on the side wall surface at the rear end, a first flow guide baffle is arranged in the cavity close to the air inlet, the upper end and the lower end of the first flow guide baffle are respectively hermetically connected with the upper inner wall surface and the lower inner wall surface of the cavity, and a gap is reserved between the upper end and the lower inner wall surface of the cavity; and the upper end and the lower end of the third flow guide baffle are respectively hermetically connected with the upper inner wall surface and the lower inner wall surface of the cavity and a gap is reserved between the upper end and the lower end of the third flow guide baffle and the right inner wall surface of the cavity.
More than 2 columnar bodies are arranged in the cavity, the upper end surface and the lower end surface of each columnar body are respectively connected with the upper inner wall surface and the lower inner wall surface of the cavity in a sealing way, more than 2 annular through holes which penetrate and sleeve are arranged between the upper end surface and the lower end surface of each columnar body in sequence, the geometric center line of more than 2 annular through holes is superposed with the geometric center line of the columnar bodies from top to bottom, two or three strip-shaped through holes which are mutually crossed are arranged between the upper end surface and the lower end surface of each columnar body and are intersected to form a square columnar through hole or a hexagonal columnar through hole, the geometric center line of the through holes from top to bottom is superposed with the geometric center line of the.
2. The gas flow preheat assembly of claim 1, wherein: the side wall surface of all or part of the columnar body is provided with radiating fins which are spirally wound on the side wall surface of the columnar body from top to bottom.
3. The gas flow preheat assembly of claim 1, wherein: the second flow guide baffle and the third flow guide baffle divide the cavity into a buffer flow distribution area close to the air inlet and a component diffusion area close to the air outlet, room temperature air or clean air flow enters the buffer flow distribution area through two threaded holes (air inlets) on one side of the closed cavity, is preliminarily preheated through the columnar body, is naturally distributed and injected into the component diffusion area through the flow guide baffles, and flows out from one threaded hole (air outlet) on the other side of the cavity after fully contacting and exchanging heat with the radiating fins on the side wall surface of the columnar body.
4. The gas stream preheating assembly of claim 1 or 2, wherein: the material of the closed cavity is metal with high heat conduction efficiency, such as: one or more than two of aluminum and copper, but not limited to the metal.
5. The gas flow preheat assembly of claim 1, wherein: the cylindrical body is provided with 3 annular through holes which are sequentially penetrated and sleeved, the upper end surface and the lower end surface of the cylindrical body are provided with two strip-shaped through holes which are intersected with each other, each cylindrical body is composed of 4 circular ring columns with 4 gaps and the height of 5mm, the diameter of each circular ring column is 0.5mm, 1.5mm, 2.5mm and 3.5mm, the wall thickness of each circular ring is 0.25mm, and the width of each gap is 0.2-0.3 mm.
6. The gas stream preheating assembly of claim 1, 2 or 5, wherein: the transverse distance between the adjacent columnar bodies is 6mm, and the longitudinal distance is 5 mm.
7. The gas flow preheat assembly of claim 1, wherein:
the section of the first flow guide baffle plate parallel to the upper end surface is V-shaped, the opening end of the V-shape faces the wall surface where the air inlet is located, and the angle of the V-shape is 118-120 degrees;
one ends of the second flow guide baffle and the third flow guide baffle, which are far away from the connecting wall surface, are bent towards one side of the wall surface where the air inlet is positioned, and the angle is 118-120 degrees.
8. The gas flow preheat assembly of claim 2, wherein: the radiating fins are attached to the side wall surface of the columnar body, the thread pitch of the radiating fins is 0.8-1mm, the number of turns of the radiating fins is 5-6, the initial angle is 50-90 degrees, and the spiral direction is clockwise or anticlockwise.
9. A gas stream preheating assembly according to any one of claims 1 to 8, wherein:
and a heating plate and a temperature sensor are arranged on the wall surface of the groove at the bottom of the cavity, and the heating plate and the temperature sensor are respectively connected with a temperature controller and used for heating and controlling the temperature of the cavity.
The heating plate can be one or two of a silica gel heating plate or a polyimide insulating heating plate;
the temperature sensor can be one or more than two of K-type or other-type thermocouples or PT100 thermistors;
the heating plate and the temperature sensor can be of a split type or an integrated type; one surface of the heating plate is fully contacted with the wall surface of the groove at the bottom of the cavity by using heat-conducting silicone grease (the heat conductivity coefficient is more than 11W/(m.k)), and redundant air is removed.
10. Use of a gas stream preheating assembly according to any of claims 1 to 9, wherein:
two threaded holes (air inlets) on one side of the airflow preheating assembly are matched with 2 quick change connectors (made of metal) with specifications of M3/5/6 and the like, 2 tetrafluoro hoses are led out and connected with tetrafluoro hoses at an air outlet of the flow-controllable gas generating device through a Y-shaped 3-way quick change connector;
and a threaded hole (air outlet) on the other side of the airflow preheating assembly is matched with 1 quick-change connector (made of metal) with the specification of M3/5/6 and the like, 1 tetrafluoro hose is led out, and the tetrafluoro hose is connected with an external thread steel pipe of a migration pipe in a separation analysis instrument, wherein the external thread steel pipe needs to preheat an air inlet.
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