CN111796045B - Chromatographic column heating device for gas chromatograph - Google Patents
Chromatographic column heating device for gas chromatograph Download PDFInfo
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- CN111796045B CN111796045B CN202010670077.5A CN202010670077A CN111796045B CN 111796045 B CN111796045 B CN 111796045B CN 202010670077 A CN202010670077 A CN 202010670077A CN 111796045 B CN111796045 B CN 111796045B
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- 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
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- G01N30/30—Control of physical parameters of the fluid carrier of temperature
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Abstract
The application relates to a chromatographic column heating device for gas chromatograph, it includes the box, the box includes the left half case and the right half case of coaxial setting, is provided with the support in the left half case, around being equipped with the chromatographic column on the support, and the middle part of the left half case is connected with the section of thick bamboo of blowing, and the section of thick bamboo of blowing is all coaxial with left half case and support, and a plurality of exhaust vents have been seted up to the circumference face of the section of thick bamboo of blowing, and the section of thick bamboo of blowing is connected with the wind regime, and the upper portion of box is connected with the connecting portion that supplies the chromatographic column tip to wear out, and connecting portion are including connecting the left part and connecting the right part. The method has the effect of improving the temperature rising and reducing speed of the chromatographic column so as to improve the analysis efficiency of the sample.
Description
Technical Field
The application relates to the field of heating devices, in particular to a chromatographic column heating device for a gas chromatograph.
Background
At present, a gas chromatograph is an instrument for qualitatively and quantitatively analyzing a multi-component complex mixture by utilizing a chromatographic separation technology and a detection technology. During detection, a sample and a carrier gas are fully mixed at a sample inlet, then flow into a chromatographic column along with the carrier gas and continuously flow to the tail end of the chromatographic column, in the process, the sample generates a retention phenomenon between the carrier gas and a stationary phase of the chromatographic column, the retention effects of different samples are different, the time of reaching the tail end of the chromatographic column is also different, the time from the time when the sample enters a gas chromatograph to the time when a chromatogram shows a peak is called as retention time, and the different retention times correspond to different compound types.
The vast majority of gas chromatographs use a hearth to carry out air bath heating on a chromatographic column, the hearth structure is usually a large metal plate cavity, thick heat-insulating cotton materials are wrapped outside, heat is provided by heating wires inside, and a large fan is used for forced convection heat exchange.
For the related technologies, the inventor thinks that the temperature rising and reducing speed is slow (the temperature rising speed is not more than 60 ℃ per minute when the temperature of a hearth is 300 ℃, and the temperature reducing time is generally not less than 4 minutes), and the temperature rising and reducing speed of a chromatographic column is slow, so that the sample analysis efficiency is low.
Disclosure of Invention
In order to improve the temperature rise and decrease speed of a chromatographic column and improve the sample analysis efficiency, the application provides a chromatographic column heating device for a gas chromatograph.
The name provided by the application adopts the following technical scheme:
the utility model provides a chromatographic column heating device for gas chromatograph, the power distribution box comprises a box body, the box includes the left half case and the right half case of coaxial setting, is provided with the support in the left half incasement, around being equipped with the chromatographic column on the support, and the middle part of the left half case is connected with a section of thick bamboo of blowing, and a section of thick bamboo of blowing is all coaxial with left half case and support, and a plurality of exhaust vents have been seted up to the circumference of a section of thick bamboo of blowing, and a section of thick bamboo of blowing is connected with the wind regime, and the upper portion of box is connected with the connecting portion that supply chromatographic column tip to wear out, and connecting portion are including connecting the left part and connecting the right part.
By adopting the technical scheme, after the bracket wound with the chromatographic column is placed in the left half box, two ends of the chromatographic column are respectively placed at two positions connected with the left part, the right half box is covered on the left half box, the right part is connected with the left part correspondingly, and the chromatographic column is installed in the box body; later the wind regime blows in hot-blast in to the box, hot-blast back of blowing from the exhaust vent of a section of thick bamboo circumferential surface of blowing, even blow to the chromatographic column from the chromatographic column inboard, blow off from connecting portion at last, make full use of the inside space of chromatographic column, the volume of box has been reduced, and a section of thick bamboo of blowing carries out even blowing heat transfer simultaneously to the inboard of chromatographic column, when needs cool down to the chromatographic column, blow in a section of thick bamboo of blowing after cold wind can, and the setting of the exhaust vent, be favorable to the rapid heating up and the cooling of chromatographic column, the homogeneity that the chromatographic column was heated everywhere has been guaranteed.
Preferably, the outer wall of the blowing cylinder is fixedly connected with a plurality of air guide pipes, the air guide pipes are communicated with the air outlet holes, and the axial direction of the air guide pipes coincides with the radial direction of the blowing cylinder.
Through adopting above-mentioned technical scheme, the guide duct plays the guide effect to the wind that blows off from the exhaust vent for can be after one section by the guide in the guide duct after the wind blows off, disperse again, make to blow to the hot-blast comparatively even and the wind direction of chromatographic column comparatively stable, avoided wind too to disperse disorderly, and cause and move to the inhomogeneous blowing of chromatographic column.
Preferably, the blowing cylinder is rotatably connected with the left half box, the rotating axis of the blowing cylinder coincides with the axis of the blowing cylinder, and a rotating assembly capable of driving the blowing cylinder to rotate is arranged in the box body.
Through adopting above-mentioned technical scheme, the section of thick bamboo of blowing rotates for the wind circulation that blows off from different exhaust vents directly blows the different positions of chromatographic column, can carry out more even blowing to the chromatographic column, has guaranteed the chromatographic column uniformity that heats everywhere and heaies up.
Preferably, the rotating assembly comprises a driven gear and a driving gear, a limiting ring is fixedly connected to the inner wall of the left half box, a blowing barrel sleeve is arranged on the outer wall of the limiting ring and is connected with the limiting ring in a rotating mode, the driven gear sleeve is arranged on the outer wall of the blowing barrel, the driven gear is fixedly connected with the blowing barrel in a coaxial mode, the driving gear is meshed with the driven gear, the driving gear is connected with the left half box in a rotating mode, and the driving gear is connected with a driving motor capable of driving the driving gear to rotate.
Through adopting above-mentioned technical scheme, driving motor starts, and driving motor drives the driving gear and rotates, and the driving gear drives driven gear and rotates, and driven gear drives a section of thick bamboo of blowing and rotates, has realized blowing a section of thick bamboo and has sent the rotation certainly, and the spacing collar carries out certain support to a section of thick bamboo of blowing simultaneously for it is comparatively stable to blow a section of thick bamboo rotation.
Preferably, the end part of the blowing cylinder far away from the limiting ring is closed, the middle part of the outer wall of the end part of the blowing cylinder far away from the limiting ring is provided with a limiting groove, the inner wall of the right half box is fixedly connected with a limiting column, and the limiting column is matched with the limiting groove.
By adopting the technical scheme, when the right half box and the left half box are installed, the limiting column is gradually inserted into the limiting groove along with the fact that the right half box is gradually close to the left half box, and when the blowing cylinder rotates, the limiting column and the limiting ring respectively support two ends of the blowing cylinder, so that the rotating stability of the blowing cylinder is ensured; the supporting mode of spacing groove and spacing post for the right side half case can support the section of thick bamboo of blowing, the dismantlement between the right side half case and the left side half case of also being convenient for simultaneously.
Preferably, half case fixedly connected with hot-blast main in a left side, hot-blast main communicate in the inside of spacing collar, and spacing collar and the inside intercommunication of box, hot-blast main intercommunication have the heating cabinet, and the hot-blast main is provided with the fan, and the top intercommunication of connecting portion has the back flow, back flow and heating cabinet intercommunication.
Through adopting above-mentioned technical scheme, the fan plays the drive effect to the flow of gas for the air enters into the heating cabinet and heats, then gets into the spacing collar, and then enters into a section of thick bamboo of blowing, then evenly blows to the chromatographic column from the exhaust vent on, later enters into the heating cabinet from the back flow, makes the hot-air can be used by the circulation, has reduced thermal waste.
Preferably, the top of the connecting part is communicated with an air outlet pipe, and the hot air pipe is communicated with an air inlet pipe.
By adopting the technical scheme, when the temperature is reduced, the inlet and the outlet of the heating box are closed, the air inlet pipe is opened, the external cold air enters the hot air pipe from the air inlet pipe, then enters the air blowing cylinder, finally is uniformly blown to the chromatographic column from the air outlet hole, cools the chromatographic column, and finally is discharged from the air outlet pipe, and the external cold air can be accessed into the box body through the arrangement of the air inlet pipe and the air outlet pipe, so that the cooling effect can be further improved.
Preferably, the air inlet pipe is communicated with a filtering device.
Through adopting above-mentioned technical scheme, before the outside cold air entered into the hot-blast main from the air-supply line, can filter the dust that it contained earlier through filter equipment for contain back city in the wind that blows to the chromatographic column from the exhaust vent and be very few, reduced the fish tail of the dust that the chromatographic column surface received.
Preferably, a sealing ring is connected to the top position inside the connecting part.
By adopting the technical scheme, when the left half box and the right half box are connected, the left part and the right part are connected and abutted, and meanwhile, the sealing rings can abut against the connecting positions of the two ends of the chromatographic column and the gas chromatograph body, so that the box body can be sealed, hot air in the box body is not easy to scatter outwards, and the temperature rising speed is further ensured; simultaneously, the wind that blows off from the section of thick bamboo of blowing can flow along connecting portion at last, blows off until the back flow at connecting portion top or play tuber pipe, has also guaranteed that whole chromatographic column homoenergetic can be even and synchronous intensification or cooling.
Preferably, the inner wall of the box body is fixedly connected with a heat-insulating layer.
Through adopting above-mentioned technical scheme, the setting of heat preservation for the temperature in the box scatters and disappears less to the outside, is favorable to further improving the rate of rise of temperature of chromatographic column.
In summary, the present application includes at least one of the following beneficial technical effects:
1. by arranging the box body and the blowing cylinder, the space in the chromatographic column is fully utilized, the volume of the box body is reduced, the blowing cylinder simultaneously and uniformly blows and exchanges heat to the inner side of the chromatographic column, when the chromatographic column needs to be cooled, cold air is blown into the blowing cylinder, and the arrangement of the blowing holes is favorable for rapid heating and cooling of the chromatographic column, so that the uniformity of heating all parts of the chromatographic column is ensured;
2. the rotary connection of the air blowing cylinder ensures the rotary stability of the air blowing cylinder, can blow the chromatographic column more uniformly, and ensures the uniformity of the temperature rise of the chromatographic column when being heated;
3. through setting up hot-blast main, back flow, heating cabinet, air-supply line and play tuber pipe for hot-blast can be by make full use of, be favorable to improving the programming rate, and be convenient for introduce external cold air and cool down.
Drawings
Fig. 1 is a schematic structural view of the present embodiment.
Fig. 2 is a schematic structural view of the embodiment with the right half box hidden.
Fig. 3 is a cross-sectional view of the blow cylinder.
Fig. 4 is a partially enlarged structural view of a portion a in fig. 3.
Fig. 5 is a schematic view of the structure of the filter device.
Description of reference numerals: 1. a box body; 11. a left half-box; 111. a support; 112. a chromatographic column; 113. a limiting ring; 114. buckling; 12. a right half-tank; 121. a limiting column; 122. a heat-insulating layer; 2. a connecting portion; 21. a connecting left part; 211. a return pipe; 22. a connecting right part; 221. an air outlet pipe; 3. a seal ring; 31. sealing the left ring; 32. sealing the right ring; 4. a blowing cylinder; 41. an air outlet; 42. an air guide pipe; 43. a limiting groove; 5. a rotating assembly; 51. a driven gear; 52. a driving gear; 521. a drive motor; 6. a hot air pipe; 61. a fan; 62. an air inlet pipe; 63. a heating box; 7. a filtration device; 71. a filter box; 72. and (4) a filter screen.
Detailed Description
The present application is described in further detail below with reference to figures 1-5.
The embodiment of the application discloses a chromatographic column heating device for a gas chromatograph. Referring to fig. 1 and 2, a chromatographic column heating device for gas chromatograph includes box 1, box 1 includes coaxial left half-box 11 and right half-box 12 that sets up, be connected with a plurality of buckles 114 between left half-box 11 and the right half-box 12, be provided with support 111 in the left half-box 11, around being equipped with chromatographic column 112 on the support 111, the middle part of left half-box 11 rotates and is connected with section of thick bamboo 4 of blowing, be provided with in the box 1 and drive section of thick bamboo 4 pivoted rotating assembly 5 of blowing, section of thick bamboo 4 of blowing, the axis of rotation of section of thick bamboo 4 of blowing is all coaxial with left half-box 11 and support 111, a plurality of exhaust vents 41 have been seted up to the circumference of section of thick bamboo 4 of blowing, section of thick bamboo 4 of blowing is connected with the wind regime, the upper portion of box 1 is connected with the connecting portion 2 that supplies chromatographic column 112 tip to wear out, the both ends of chromatographic column 112 wear out back from connecting portion 2 and are connected with the body of gas chromatograph. The space in the middle of the chromatographic column 112 is fully utilized, the volume of the box body 1 is reduced, and the rotation of the air blowing cylinder 4 enables the chromatographic column 112 to be heated and cooled more uniformly, so that the rapid heating and cooling of the chromatographic column 112 are facilitated.
Referring to fig. 1 and 2, two connecting portions 2 are provided, two connecting portions 2 are respectively provided at two sides of the axis of the box body 1, each connecting portion 2 includes a left connecting portion 21 and a right connecting portion 22, the left connecting portion 21 is fixedly connected with the left half box 11, and the right connecting portion 22 is fixedly connected with the right half box 12. The inside top position of connecting portion 2 is connected with sealing washer 3, and sealing washer 3 is including sealed left circle 31 and sealed right circle 32, and sealed left circle 31 fixed connection is in the top of connecting left portion 21 inner wall, and sealed right circle 32 fixed connection is in the top of connecting right portion 22 inner wall. When the left half box 11 and the right half box 12 are connected, the left part 21 and the right part 22 are connected tightly, meanwhile, the sealing ring 3 can tightly support the two ends of the chromatographic column 112 and the connection position of the gas chromatograph body, so that the box body 1 is internally sealed, hot air in the box body 1 is not easy to dissipate and disperse outwards from the box body 1, and the heating speed is ensured.
Referring to fig. 3 and 4, the rotating assembly 5 includes a driven gear 51, a driving gear 52, a limiting ring 113 is fixedly connected to the inner wall of the left half-box 11, a blowing tube 4 is sleeved on the outer wall of the limiting ring 113 and is rotatably connected with the limiting ring 113, the outer wall of the blowing tube 4 is sleeved on the driven gear 51, the driven gear 51 is coaxially and fixedly connected with the blowing tube 4, the driving gear 52 is meshed with the driven gear 51, the driving gear 52 is rotatably connected with the left half-box 11, the driving gear 52 is connected with a driving motor 521 capable of driving the self-rotation, the end portion, far away from the limiting ring 113, of the blowing tube 4 is sealed, a limiting groove 43 is formed in the middle of the outer wall, far away from the end portion of the limiting ring 113, a limiting column 121 is fixedly connected with the inner wall of the right half-box 12, and the limiting column 121 is matched with the limiting groove 43. The outer wall of the air blowing tube 4 is fixedly connected with a plurality of air guide pipes 42, the air guide pipes 42 are communicated with the air outlet 41, the axial directions of the air guide pipes 42 are overlapped with the radial direction of the air blowing tube 4, and the air guide pipes 42 play a role in guiding the air blown out from the air outlet 41, so that the hot air blown to the chromatographic column 112 is uniform, and the air direction is stable.
Referring to fig. 1, the left half box 11 is fixedly connected with a hot-air duct 6, the hot-air duct 6 is communicated with the inside of the limit ring 113, the limit ring 113 is communicated with the inside of the box body 1, the hot-air duct 6 is communicated with a heating box 63, a plurality of heating wires (not shown in the figure) are fixedly connected in the heating box 63, the hot-air duct 6 is provided with a fan 61, the top of the connecting part 2 is communicated with a return pipe 211, and the return pipe 211 is communicated with the heating box 63. The top of the connecting part 2 is communicated with an air outlet pipe 221, and the hot air pipe 6 is communicated with an air inlet pipe 62. When the temperature of the chromatographic column 112 is raised, the fan 61 drives air to enter the heating box 63 for heating, then enter the limiting ring 113, further enter the air blowing tube 4, then be uniformly blown onto the chromatographic column 112 from the air outlet 41, and then enter the heating box 63 from the return pipe 211, so that the hot air can be recycled, and the waste of heat is reduced; when the chromatographic column 112 is cooled, the inlet and outlet of the heating box 63 are closed, the air inlet pipe 62 is opened, the external cold air enters the hot air pipe 6 from the air inlet pipe 62, then enters the air blowing tube 4, and finally is uniformly blown to the chromatographic column 112 from the air outlet 41 to cool the chromatographic column 112, and finally is discharged from the air outlet pipe 221.
Referring to fig. 4, the inner wall of the box 1 is fixedly connected with a heat insulating layer 122, so that the temperature inside the box 1 is less dissipated to the outside, which is beneficial to further increasing the temperature rising rate of the chromatographic column 112.
Referring to fig. 3 and 5, the air inlet pipe 62 is communicated with the filtering device 7, the filtering device 7 can be any structure capable of filtering air, in this embodiment, the filtering device 7 includes a filtering box 71 and a filtering net 72, the filtering net 72 is connected in the filtering box 71, when the outside cold air enters the filtering box 71, the outside cold air needs to first pass through the filtering net 72, so that some dust in the air entering the box 1 can be removed, and the surface of the chromatographic column 112 is less prone to being scratched by the dust.
The implementation principle of the chromatographic column heating device for the gas chromatograph is as follows: place chromatographic column 112 in half case 11 on the left side to with chromatographic column 112's both ends and gas chromatograph body coupling, then establish half case 12 lid on half case 11 on the left side, and with buckle 114 straining, the sealing washer 3 of connecting left part 21 and connecting right part 22 top this moment can support tightly with the hookup location of chromatographic column 112 both ends and gas chromatograph body, makes box 1 internal seal.
Then the driving motor 521 is started, the driving motor 521 drives the driving gear 52 to rotate, the driving gear 52 drives the driven gear 51 to rotate, the driven gear 51 drives the blowing cylinder 4 to rotate, meanwhile, the fan 61 is started, the air inlet pipe 62 and the air outlet pipe 221 are closed, the fan 61 drives air to enter the heating box 63 to be heated, then enter the limiting ring 113 and further enter the blowing cylinder 4, then the air is uniformly blown to the chromatographic column 112 from the air outlet 41, and then enters the heating box 63 from the return pipe 211, so that hot air can be recycled, and the temperature rise speed is increased; when the temperature is reduced, the inlet and the outlet of the heating box 63 are closed, the air inlet pipe 62 is opened, the external cold air enters the hot air pipe 6 from the air inlet pipe 62, then enters the air blowing cylinder 4, and finally is uniformly blown to the chromatographic column 112 from the air outlet 41 to cool the chromatographic column 112, and finally is discharged from the air outlet pipe 221; the space in the chromatographic column 112 is fully utilized, the volume of the box body 1 is reduced, and the air blowing cylinder 4 blows the chromatographic column 112 comprehensively, so that the rapid temperature rise and temperature drop of the chromatographic column 112 are facilitated.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (5)
1. A chromatographic column heating device for a gas chromatograph is characterized in that: the box comprises a box body (1), wherein the box body (1) comprises a left half box (11) and a right half box (12) which are coaxially arranged, a support (111) is arranged in the left half box (11), a chromatographic column (112) is wound on the support (111), the middle part of the left half box (11) is connected with a blowing cylinder (4), the blowing cylinder (4) is coaxial with the left half box (11) and the support (111), the circumferential surface of the blowing cylinder (4) is provided with a plurality of air outlet holes (41), the blowing cylinder (4) is connected with an air source, the upper part of the box body (1) is connected with a connecting part (2) through which the end part of the chromatographic column (112) penetrates out, and the connecting part (2) comprises a connecting left part (21) and a connecting right part (22);
the outer wall of the blowing tube (4) is fixedly connected with a plurality of air guide pipes (42), the air guide pipes (42) are communicated with the air outlet holes (41), and the axial direction of the air guide pipes (42) is superposed with the radial direction of the blowing tube (4);
the air blowing cylinder (4) is rotatably connected with the left half box (11), the rotating axis of the air blowing cylinder (4) is superposed with the axis of the air blowing cylinder, and a rotating assembly (5) capable of driving the air blowing cylinder (4) to rotate is arranged in the box body (1);
the rotary assembly (5) comprises a driven gear (51) and a driving gear (52), a limiting ring (113) is fixedly connected to the inner wall of the left half box (11), the air blowing cylinder (4) is sleeved on the outer wall of the limiting ring (113) and is rotatably connected with the limiting ring (113), the driven gear (51) is sleeved on the outer wall of the air blowing cylinder (4), the driven gear (51) is coaxially and fixedly connected with the air blowing cylinder (4), the driving gear (52) is meshed with the driven gear (51), the driving gear (52) is rotatably connected with the left half box (11), and the driving gear (52) is connected with a driving motor (521) capable of driving the driving gear to rotate;
the hot air pipe (6) is fixedly connected to the left half box (11), the hot air pipe (6) is communicated with the inside of the limiting ring (113), the limiting ring (113) is communicated with the inside of the box body (1), the hot air pipe (6) is communicated with the heating box (63), the hot air pipe (6) is provided with a fan (61), the top of the connecting part (2) is communicated with a return pipe (211), and the return pipe (211) is communicated with the heating box (63);
the top of the connecting part (2) is communicated with an air outlet pipe (221), and the hot air pipe (6) is communicated with an air inlet pipe (62);
when the temperature of the chromatographic column (112) is raised, the fan (61) drives air to enter the heating box (63) for heating, then enter the limiting ring (113) and further enter the air blowing cylinder (4), then evenly blow the air to the chromatographic column (112) from the air outlet (41), and then enter the heating box (63) from the return pipe (211), so that the hot air can be recycled;
when the chromatographic column (112) is cooled, the inlet and the outlet of the heating box (63) are closed, the air inlet pipe (62) is opened, the outside cold air enters the hot air pipe (6) from the air inlet pipe (62), then enters the air blowing cylinder (4), finally is uniformly blown to the chromatographic column (112) from the air outlet (41), cools the chromatographic column (112), and finally is discharged from the air outlet pipe (221).
2. A column heating apparatus for gas chromatograph according to claim 1, characterized in that: the end part of the blowing tube (4) far away from the limiting ring (113) is closed, the middle part of the outer wall of the end part of the blowing tube (4) far away from the limiting ring (113) is provided with a limiting groove (43), the inner wall of the right half box (12) is fixedly connected with a limiting column (121), and the limiting column (121) is matched with the limiting groove (43).
3. A column heating apparatus for gas chromatograph according to claim 1, characterized in that: the air inlet pipe (62) is communicated with a filtering device (7).
4. A column heating apparatus for gas chromatograph according to claim 1, characterized in that: the top position of the inside of connecting portion (2) is connected with sealing washer (3).
5. A column heating apparatus for gas chromatograph according to claim 1, characterized in that: the inner wall of the box body (1) is fixedly connected with a heat preservation layer (122).
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| CN202010670077.5A CN111796045B (en) | 2020-07-13 | 2020-07-13 | Chromatographic column heating device for gas chromatograph |
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| CN202010670077.5A CN111796045B (en) | 2020-07-13 | 2020-07-13 | Chromatographic column heating device for gas chromatograph |
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