CN210036267U - Multifunctional thermal desorption instrument - Google Patents
Multifunctional thermal desorption instrument Download PDFInfo
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- CN210036267U CN210036267U CN201920356619.4U CN201920356619U CN210036267U CN 210036267 U CN210036267 U CN 210036267U CN 201920356619 U CN201920356619 U CN 201920356619U CN 210036267 U CN210036267 U CN 210036267U
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Abstract
The utility model discloses a multi-functional thermal desorption appearance, including the casing, still include syringe constant temperature furnace, desorption stove temperature controller, syringe constant temperature furnace temperature controller. The utility model discloses a multi-functional thermal desorption appearance, except having the thermal desorption function, still have the electric heat thermostated container in order to provide thermal desorption back syringe and keep constant temperature. In some embodiments, an injector placing frame is further arranged, so that the injector is convenient to keep the temperature constant and is convenient to take and place.
Description
Technical Field
The utility model relates to an analytical instrument field, concretely relates to multi-functional thermal desorption appearance.
Background
The thermal desorption instrument is a device capable of preprocessing an analysis sample. The biggest advantage is that the tedious and time-consuming manual sample processing process can be greatly reduced. Thermal desorption instruments have become the standard method for detecting Total Volatile Organic Compounds (TVOC) in indoor air. The method is widely used for detecting trace organic matters in air, water and soil samples; detecting volatile components of food and packaging materials; monitoring the environment; fragrance of the perfume; residual solvent of the drug; detection of human exhaled breath, etc.
The existing thermal desorption instrument only has a desorption function and does not have the heat preservation function of an injector, and the injector which finishes sampling can not be kept at a constant temperature. The injector must complete the injection test in a short time, otherwise the sample and the measurement result are affected.
SUMMERY OF THE UTILITY MODEL
The utility model provides a multi-functional thermal desorption appearance for the gas chromatography who advances the appearance by hand after the desorption, be special with the supporting sample preprocessing device who uses of gas chromatograph, except having the thermal desorption function, still have the electric heat thermostated container in order to provide thermal desorption back syringe and keep constant temperature, concrete structure as follows:
a multifunctional thermal desorption instrument comprises a shell, and further comprises an injector constant temperature furnace, a desorption furnace temperature controller and an injector constant temperature furnace temperature controller.
In one embodiment of the utility model, the desorption furnace comprises an outer desorption furnace cap, an inner desorption furnace cap, a gourd nozzle, a silica gel sealing gasket, a heating pipe, a connecting pipe, a pyrolysis suction pipe, a heating body, a desorption furnace sleeve, a desorption furnace front cover and a desorption furnace rear cover;
the heating pipe is provided with a nitrogen inlet, the heating body is made of a heat conducting material, a heating pipe hole, a heating rod hole and a first temperature sensor hole are formed in the heating body, the connecting pipe is connected to the tail end of the heating pipe, the heating pipe hole is used for penetrating and connecting the heating pipe and the connecting pipe together, a heating rod and a first temperature sensor are respectively penetrated and arranged in the heating rod hole and the first temperature sensor hole, and the heating rod and a platinum resistor are electrically connected and disconnected with the furnace temperature controller;
the injector constant temperature furnace comprises a constant temperature furnace front cover, a constant temperature furnace rear cover, a constant temperature furnace inner cylinder and a constant temperature furnace outer cylinder, wherein a heat insulation layer is filled between the constant temperature furnace inner cylinder and the constant temperature furnace outer cylinder, the injector constant temperature furnace further comprises a heating sheet and a second temperature sensor, and the heating sheet and the second temperature sensor are electrically connected with the injector constant temperature furnace temperature controller.
In one embodiment of the utility model, the desorption furnace further comprises a pressure gauge and a pressure maintaining valve which are positioned on the gas path of the desorption furnace.
In an embodiment of the present invention, the first temperature sensor and the second temperature sensor are both platinum resistors.
In one embodiment of the utility model, the injector thermostatic oven and the desorption oven are respectively provided with a support leg and a bracket.
In one embodiment of the utility model, the outer desorption furnace cap is externally provided with a decorative cover.
The utility model discloses an embodiment, still include axial fan, still including locating the louvre on the casing.
In an embodiment of the present invention, the injector placing frame is disposed in the injector thermostatic oven, the injector placing frame includes a supporting body, an upper end surface of the supporting body is arc-shaped, a middle injector accommodating groove of the upper end surface, an elastic material layer is disposed in the injector accommodating groove, and a notch is disposed in the middle of the supporting body.
In the description of the present invention, if referring to the orientation or positional relationship indicated by the terms "front end", "bottom", "one end", "outer", "horizontal", "inner", "upper", "rear end", "both ends", "horizontal", "lower", "inside", "lower", "below", "lower", "above", etc., unless otherwise specified, it is based on the orientation or positional relationship shown in the drawings for the convenience of description and simplification of the description, and it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Has the advantages that:
the utility model discloses a multi-functional thermal desorption appearance is used for the gas chromatography who manually advances the appearance after the desorption, is the sample preprocessing device who uses with the gas chromatograph is supporting specially, except having the thermal desorption function, still has the electric heat thermostated container in order to provide thermal desorption back syringe and keep constant temperature. In some embodiments, an injector placing frame is further arranged, so that the injector is convenient to keep the temperature constant and is convenient to take and place.
Drawings
FIG. 1 is a schematic structural view of the multifunctional thermal desorption apparatus of the present invention;
FIG. 2 is a schematic structural view of a desorption furnace of the multifunctional thermal desorption instrument of the present invention;
FIG. 3 is a cross-sectional view of the outer desorption furnace cap of the desorption furnace of the multifunctional thermal desorption instrument of the utility model;
FIG. 4 is a cross-sectional view of the inner desorption furnace cap of the desorption furnace of the multifunctional thermal desorption instrument of the utility model;
FIG. 5 is a cross-sectional view of a gourd nozzle of the desorption furnace of the multifunctional thermal desorption instrument of the present invention;
FIG. 6 is a top view of the heating tube of the desorption furnace of the multifunctional thermal desorption instrument of the present invention;
FIG. 7 is a cross-sectional view of the heating tube of the desorption furnace of the multifunctional thermal desorption instrument of the present invention;
FIG. 8 is a sectional view of the connection tube of the desorption furnace of the multifunctional thermal desorption instrument of the present invention;
FIG. 9 is a schematic view of the external structure of the desorption furnace of the multi-functional thermal desorption apparatus of the present invention, in which the heating pipe and the connection pipe are connected together;
FIG. 10 is a top view of the heating member of the desorption furnace of the multifunctional thermal desorption apparatus of the present invention;
FIG. 11 is a cross-sectional view of the heating body of the desorption furnace of the multifunctional thermal desorption instrument of the present invention;
FIG. 12 is a top view of a desorption furnace sleeve of the desorption furnace of the multifunctional thermal desorption instrument of the present invention;
FIG. 13 is a schematic view of the external structure of the desorption furnace sleeve of the desorption furnace of the multifunctional thermal desorption instrument of the present invention;
FIG. 14 is a top view of a front cover of a desorption furnace of the multifunctional thermal desorption instrument of the present invention;
FIG. 15 is a cross-sectional view of the front cover of the desorption furnace of the multifunctional thermal desorption instrument of the present invention;
FIG. 16 is a top view of the rear lid of the desorption furnace of the multi-functional thermal desorption instrument of the present invention;
FIG. 17 is a sectional view of the rear lid of the desorption furnace of the multi-functional thermal analyzer of the present invention;
FIG. 18 is a sectional view of a thermostatic oven front cover of the multifunctional thermal desorption instrument injector thermostatic oven of the present invention;
FIG. 19 is a sectional view of the rear cover of the thermostatic oven of the multifunctional thermal desorption instrument injector thermostatic oven of the present invention;
FIG. 20 is a schematic structural view of an inner cylinder of a thermostatic oven of the multifunctional thermal desorption instrument injector thermostatic oven of the present invention;
FIG. 21 is a schematic structural view of the outer cylinder of the thermostatic oven of the multifunctional thermal desorption instrument injector thermostatic oven of the present invention;
FIG. 22 is a sectional view of the decoration cover of the multifunctional thermal desorption instrument injector thermostatic oven of the present invention
FIG. 23 is a schematic structural view of an injector holder of the multifunctional thermal desorption instrument injector thermostatic oven of the present invention;
FIG. 24 is a schematic view of the gas path of the desorption furnace of the multi-functional thermal desorption instrument of the present invention;
the drawings in the above figures are not to scale and the drawings are appropriately scaled from the prior art for clarity of viewing.
In the figure, a desorption furnace temperature controller 10, an injector constant temperature furnace temperature controller 20, a pressure gauge 30, a pressure stabilizing valve 40, an injector constant temperature furnace 50, a desorption furnace 60, an outer desorption furnace cap 61, an inner desorption furnace cap 62, a gourd nozzle 63, a silica gel sealing gasket 64, a heating pipe 651, a connecting pipe 652, a pyrolysis suction pipe 67, a heating body 68, a desorption furnace sleeve 661, a desorption furnace front cover 662, a desorption furnace rear cover 663, a nitrogen inlet 71, a heating pipe hole 681, a heating rod hole 682, a first temperature sensor hole 683, a suction furnace temperature controller 10, a constant temperature furnace front cover 51, a constant temperature furnace rear cover 52, a constant temperature furnace inner cylinder 53, a constant temperature furnace outer cylinder 54, a support body 551, an injector accommodating groove 552, an elastic material layer 553, a gap 554, a two-position two-way valve 72, an air resistance 73.
Detailed Description
In order to explain the technical content, structural features, achieved objects and functions of the present invention in detail, the following embodiments are described in detail with reference to the accompanying drawings.
As shown in fig. 1, the multifunctional thermal desorption instrument comprises a shell, and further comprises a desorption furnace temperature controller 10, an injector constant temperature furnace temperature controller 20, a pressure gauge 30, a pressure stabilizing valve 40, an injector constant temperature furnace 50 and a desorption furnace 60;
with reference to fig. 2-17, the desorption furnace 60 includes an outer desorption furnace cap 61, an inner desorption furnace cap 62, a gourd nozzle 63, a silica gel sealing gasket 64, a heating pipe 651, a connecting pipe 652, a pyrolysis suction pipe 67, a heating body 68, a desorption furnace sleeve 661, a desorption furnace front cover 662, and a desorption furnace rear cover 663;
the heating pipe 651 is provided with a nitrogen inlet 71, the heating body 68 is made of a heat conducting material, a heating pipe hole 681, a heating rod hole 682 and a first temperature sensor hole 683 are arranged on the heating pipe 651, the connecting pipe 652 is connected to the tail end of the heating pipe 651, the heating pipe hole 681 is used for penetrating and connecting the heating pipe 651 and the connecting pipe 652 together, a heating rod and a first temperature sensor are respectively penetrated and arranged in the heating rod hole 682 and the first temperature sensor hole 683, and the heating rod and the platinum resistor are electrically connected and disconnected with the furnace temperature controller 10.
In fig. 3 and 4, a hole at the upper part of the desorption furnace cap is used for penetrating through the upper part of the gourd nozzle, a groove at the lower part is used for clamping and sleeving the lower part of the gourd nozzle, and a groove at the middle part is used for placing a silica gel sealing gasket; in fig. 5, the hole at the upper part is used for ventilation, the groove at the lower part is used for placing a silica gel sealing gasket sleeved outside the upper end of the desorption tube, in fig. 7, the nitrogen inlet is externally connected with a pipeline to an air inlet arranged on the shell, a two-position two-way valve 72 (an electromagnetic valve) is arranged on the pipeline, an air passage is communicated with the pressure gauge 30 and the pressure stabilizing valve 40, and then an air resistor 73 is connected. Nitrogen gas enters the nitrogen inlet and the following heating pipe from the gas inlet and the gas path after adjustment. In fig. 7, the lower end of the heating tube is open and is provided with a clamping groove for connecting the lower connecting tube to adapt to a longer desorption tube; in fig. 11, the heating tube hole, the heating rod hole and the first temperature sensor hole on the heating body are all through, and the connecting tube can extend out of the heating body, so long as the pyrolysis straw is partially arranged in the heating body; in fig. 13, the holes of the desorption furnace sleeve 661 are used to fit and fix the holes of the desorption furnace front cover 662 (fig. 14 and 15) and the side wall of the desorption furnace rear cover 663 (fig. 17). Holes in the center of the desorption furnace front cover 662 (fig. 14, 15) and the desorption furnace rear cover 663 (fig. 17) are used for running wires of the heating rods and platinum resistors. Holes at the edge of the desorption furnace rear cover 663 (fig. 16 and 17) are used for installing desorption furnace legs.
As shown in fig. 18 to 21, the injector thermostatic oven 50 includes a thermostatic oven front cover 51, a thermostatic oven rear cover 52, a thermostatic oven inner cylinder 53, a thermostatic oven outer cylinder 54, a heat insulating layer filled between the thermostatic oven inner cylinder 53 and the thermostatic oven outer cylinder 54, and a heating sheet and a second temperature sensor, both of which are electrically connected to the injector thermostatic oven temperature controller 20; the inner and outer grooves (fig. 18 and 19) of the front cover 51 and the rear cover 52 of the thermostatic oven are used for clamping the inner cylinder 53 and the outer cylinder 54 of the thermostatic oven, and meanwhile, two holes at the front end and one hole at the rear end of the outer cylinder 54 of the thermostatic oven in fig. 21 are respectively fixed with the side holes (fig. 18 and 19) of the front cover 51 and the rear cover 52 of the thermostatic oven by screws. The hole (figure 19) at the upper end of the thermostatic oven rear cover 52 is used for installing the thermostatic oven bracket.
The device also comprises wires and a power switch which are respectively connected with the desorption furnace temperature controller 10, the injector constant temperature furnace temperature controller 20, the heating rod and the heating sheet.
The utility model discloses a multi-functional thermal desorption appearance, the gas circuit schematic diagram of desorption stove 24 is shown, from nitrogen gas entry 71 through two-position two-way valve 72, gas circuit intercommunication manometer 30 and surge damping valve 40, back through air lock 73 and desorption stove 60, through the hose connection syringe 80 of being connected with calabash connector 63. Specifically, the gas enters the heating pipe from the nitrogen inlet, and due to the sealing of the front part of the outer side of the pyrolysis suction pipe, the gas can only downwards reach the connecting pipe along the outer part of the pyrolysis suction pipe and upwards reach the connected injector along the inner part of the pyrolysis suction pipe. The heating environment of the pyrolysis straw is provided by a heating pipe, and the heat of the heating pipe is transferred by a heating rod through a heating body.
The desorption furnace temperature controller 10 and the injector constant temperature furnace temperature controller 20 also comprise digital displays with input functions. The utility model discloses a what the temperature controller chose for use is STM32 type singlechip, still can be for microprocessor, other singlechips, PLC, FPGA programmable logic gate circuit, SoC system level chip, and the technical personnel in this field can freely select the type as required, can not understand right the utility model discloses a protection scope's restriction. The heating rod and the heating sheet are common commercial products, and the type can be freely selected according to the requirement. The outer desorption furnace cap 61 is made of nylon or other heat insulation materials, and the inner desorption furnace cap 62 is made of metal materials, which can be alloy materials. The outer desorption furnace cap 61 is sleeved outside the inner desorption furnace cap 62 through threads, and can be fastened and sealed, and can insulate heat to prevent scalding.
In a specific embodiment, the first temperature sensor and the second temperature sensor may be commercially available platinum resistors.
After the sampling of the injector is completed, the injector is placed into the injector thermostatic oven 50 to maintain a constant temperature. The injector thermostatic oven 50 is provided with an opening on the housing for taking and placing the injector.
The utility model discloses a theory of operation of multi-functional thermal desorption appearance:
because of the limitation of the minimum detection concentration of the existing gas chromatograph, the pollution components in the ambient air must be concentrated and sample-injected for analysis, so that the requirements of the standard detection method can be met. The utility model discloses a multi-functional thermal desorption appearance is essentially a sample acquisition concentrated processing apparatus. The working principle is that a proper adsorbent 90 (active carbon, TenaxGC or TenaxTA) is selected and loaded into an adsorption tube, a certain volume of air sample is quantitatively collected, and volatile organic compounds (or inorganic compounds) in the air are retained in the adsorption tube. After sampling, the adsorption tube is placed in a thermal desorption instrument for heating, the volatile organic compounds are desorbed and stored in a large injector (namely the injector 80), and the volatile organic compounds are quantitatively injected into a gas chromatograph for qualitative and quantitative analysis. In order to improve the quantitative accuracy, the syringe must be placed in a special electric heating thermostat to keep the constant temperature of 60 ℃ after desorption.
The utility model discloses a step of the thermal desorption operation of multi-functional thermal desorption appearance:
1 setting and adjusting the temperature required by the thermal desorption instrument;
2, selecting the required flow and adjusting the position of the pressure valve (according to pressure indication);
3 connecting 100ml injector (namely injector 80) in series at the gas collecting opening (calabash connecting mouth);
4 installing an adsorption tube (namely a thermal desorption tube 67) and starting to record desorption time, simultaneously pressing a switch button, and immediately closing the injector after filling gas of about a few milliliters;
5 waiting for desorption for about 3-20 minutes (according to different requirements);
6, pressing a switch button (namely the two-position two-way valve 72) after the desorption time is up, enabling the desorption gas to automatically flow through the adsorption tube and enter the injector, and turning off the switch when the scale of the injector reaches 100 ml;
7 taking down the injector, immediately blocking the air inlet of the injector by using a rubber cap, and putting the large injector back into the constant temperature furnace for constant temperature;
and 8, taking a certain amount of gas in the injector according to the requirement, and injecting the gas into a gas chromatograph for qualitative and quantitative analysis.
Collecting sample flow setting:
1. a soap film flowmeter equipped with gas chromatography is connected to the gas production outlet;
2. opening an air supply valve of a high-pressure air bottle, and adjusting the output pressure to be about 0.4 MPa;
3. slowly and clockwise rotating the knob of the pressure stabilizing adjusting valve, and at the moment, the pressure displayed by the pressure gauge is also increased continuously;
4. the gas flow was measured and the corresponding pressure gauge reading (0.1MPa flow 100ml/min) was found at this time.
In one embodiment of the present invention, as shown in fig. 1, the injector thermostatic oven 50 and the desorption oven 60 are provided with a leg and a bracket, respectively.
Referring to fig. 22, in an embodiment of the present invention, a decorative cover is provided outside the outer desorption furnace cap 61. The decorative cover is projected on the outer portion of the outer desorption furnace cap, and the outer edge face can be sprayed with plastics.
The utility model discloses an embodiment, still include axial fan, still including the louvre of locating the casing. The axial flow fan blows air outwards through the heat dissipation holes to dissipate heat.
Referring to fig. 23, in an embodiment of the present invention, an injector holder is disposed in the injector thermostatic oven 50, the injector holder includes a support body 551, an upper end surface of the support body 551 is arc-shaped, a middle injector accommodating groove 552 of the upper end surface, an elastic material layer 553 is disposed in the injector accommodating groove 552, and a notch 554 is disposed in the middle of the support body 551. The injector which has finished sampling can be conveniently arranged. The arc-shaped upper end face plays a role in guiding, the injector accommodating groove does not need to be accurately aligned, the elastic material layer plays a role in buffering and protecting, and elastic materials such as sponge and the like can be used, and a rubber pad is preferably used. The notch is convenient for hands to pass through and grab upwards when the syringe is taken.
To sum up, the preferred embodiment of the present invention is only, the protection scope of the present invention is not limited thereto, and all equivalent changes and modifications made in accordance with the patent scope and the content of the specification of the present invention are all within the scope covered by the present invention.
Claims (7)
1. A multifunctional thermal desorption instrument comprises a shell, and is characterized by also comprising an injector constant temperature furnace (50), a desorption furnace (60), a desorption furnace temperature controller (10) and an injector constant temperature furnace temperature controller (20); the desorption furnace (60) comprises an outer desorption furnace cap (61), an inner desorption furnace cap (62), a calabash nozzle (63), a silica gel sealing gasket (64), a heating pipe (651), a connecting pipe (652), a pyrolysis suction pipe (67), a heating body (68), a desorption furnace sleeve (661), a desorption furnace front cover (662) and a desorption furnace rear cover (663);
the heating pipe (651) is provided with a nitrogen inlet (71), the heating body (68) is made of a heat conducting material, a heating pipe hole (681), a heating rod hole (682) and a first temperature sensor hole (683) are formed in the heating pipe (651), the connecting pipe (652) is connected to the tail end of the heating pipe (651), the heating pipe hole (681) is used for penetrating and connecting the heating pipe (651) and the connecting pipe (652) together, a heating rod and a first temperature sensor are respectively penetrated and arranged in the heating rod hole (682) and the first temperature sensor hole (683), and the heating rod and a platinum resistor are electrically connected with the furnace temperature controller (10);
the injector constant temperature furnace (50) comprises a constant temperature furnace front cover (51), a constant temperature furnace rear cover (52), a constant temperature furnace inner cylinder (53) and a constant temperature furnace outer cylinder (54), wherein a heat insulation layer is filled between the constant temperature furnace inner cylinder (53) and the constant temperature furnace outer cylinder (54), and the injector constant temperature furnace further comprises a heating sheet and a second temperature sensor, wherein the heating sheet and the second temperature sensor are electrically connected with the injector constant temperature furnace temperature controller (20).
2. The multi-functional thermal desorption apparatus of claim 1 further comprising a pressure gauge (30) and a pressure maintaining valve (40) located in the gas path of the desorption furnace (60).
3. The multi-functional thermal desorption apparatus of claim 1 wherein the first temperature sensor or the second temperature sensor is a platinum resistor.
4. The multi-functional thermal desorption apparatus according to claim 1, wherein the injector thermostatic oven (50) and the desorption oven (60) are provided with legs and supports, respectively.
5. The multi-functional thermal desorption apparatus of claim 1 wherein a decorative cover is provided outside the outer desorption furnace cap (61).
6. The multi-functional thermal desorption apparatus of claim 1 further comprising an axial fan and further comprising louvers disposed in the housing.
7. The multi-functional thermal desorption apparatus according to claim 1, wherein the injector thermostatic oven (50) is provided with an injector placing rack, the injector placing rack comprises a support body (551), the upper end surface of the support body (551) is arc-shaped, a middle injector accommodating groove (552) is arranged in the upper end surface, an elastic material layer (553) is arranged in the injector accommodating groove (552), and a notch (554) is arranged in the middle of the support body (551).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920356619.4U CN210036267U (en) | 2019-03-20 | 2019-03-20 | Multifunctional thermal desorption instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920356619.4U CN210036267U (en) | 2019-03-20 | 2019-03-20 | Multifunctional thermal desorption instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210036267U true CN210036267U (en) | 2020-02-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920356619.4U Active CN210036267U (en) | 2019-03-20 | 2019-03-20 | Multifunctional thermal desorption instrument |
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| Country | Link |
|---|---|
| CN (1) | CN210036267U (en) |
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2019
- 2019-03-20 CN CN201920356619.4U patent/CN210036267U/en active Active
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