High-temperature thermal cracking sampling device
By incorporating a thermally conductive metal structure and a carrier gas preheating channel into the pyrolysis sample introduction device, and combining this with the design of heating element two, the problem of sample condensation after carrier gas introduction was solved, thereby improving temperature stability and detection accuracy, reducing device size and weight, and increasing sample heating and detection efficiency.
Patent Information
- Application Number
- CN202423004716.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-06
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2034-12-06
AI Technical Summary
Existing pyrolysis sample introduction devices suffer from sample condensation after high-temperature pyrolysis due to the carrier gas being introduced at room temperature, resulting in unstable temperature control, reduced sample detection accuracy, and a large device size, which reduces the heating and cooling rates and affects the efficiency of sample heating and detection.
A high-temperature pyrolysis sample introduction device was designed, which adopts a metal block structure pyrolysis cell with good thermal conductivity, and sets up a carrier gas channel and a sample tube. The carrier gas channel and sample tube are preheated by heating elements, and the pyrolysis cell is heated separately by the sealing end and heating elements, which reduces intermediate path and airtightness loss and improves temperature stability.
It effectively avoids sample condensation, improves temperature control stability and detection accuracy, while reducing the size and weight of the device, and achieves rapid heating and efficient sample detection.
Smart Images
Figure CN223796517U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of analytical instrument, especially a high temperature thermal cracking sampling device. BACKGROUND
[0002] When the thermal cracking sampling device adopts high temperature pyrolysis, the sample needs to be maintained at a high temperature after being heated, gasified and decomposed, and is connected to a gas chromatograph or a Fourier transform infrared spectrometer, etc. The device is connected to a carrier gas after the sample is decomposed. Since the carrier gas is connected at room temperature, it will immediately absorb heat and cause the heating area to cool down after contacting the sample, which will cause the temperature control stability of the device to decrease and the sample to condense, thereby reducing the accuracy of sample detection. Due to this reason, the existing thermal cracking sampling device is large in size and is used to maintain the heat preservation performance, thereby reducing the heating and heat dissipation rate of the device and the sample heating and detection efficiency. SUMMARY
[0003] To solve the above technical problems, the utility model discloses a high temperature thermal cracking sampling device, which comprises a pyrolysis pool body and a sample tube. The pyrolysis pool body is a metal block structure with heat conduction performance. A pyrolysis cavity and a carrier gas channel are formed in the pyrolysis pool body. A heating element and the sample tube are arranged in the pyrolysis cavity. The heating element can heat the pyrolysis cavity and the sample tube and heat the carrier gas channel through the heat conduction of the pyrolysis pool body. One end of the carrier gas channel is connected to the carrier gas, and the other end is connected to the sample tube to form a preheating passage that can be heated by the carrier gas channel before the carrier gas enters the sample tube.
[0004] Specifically, the sample tube and the carrier gas channel are arranged through the pyrolysis pool body from top to bottom. A sealed end is arranged on the pyrolysis pool body. The sealed end comprises a sample loading end and a sample discharging end. The carrier gas channel and the sample tube are connected through the sample loading end at the top of the pyrolysis pool body. The sample loading end is provided with a sample loading through hole and an air inlet. The sample loading through hole passes through the sample loading end and is connected to the outside and the sample tube respectively to form a channel for loading the sample tube. One end of the air inlet is connected to the carrier gas channel, and the other end is connected to the middle of the sample loading through hole. The sample discharging end is provided with a sample discharging through hole that passes through the sample discharging end. The sample discharging through hole is connected to the sample tube to form a sample discharging channel.
[0005] Specifically, the sample loading end is arranged in a planar manner with the pyrolysis pool body to form a heat conduction contact surface. The air inlet is arranged along the heat conduction contact surface to form a heat preservation section. The sample discharging end is provided with a carrier gas hole corresponding to the position of the carrier gas channel and is connected to the carrier gas to form an entry end of the carrier gas on the sample discharging end.
[0006] Specifically, the sample loading through hole comprises an air inlet section and a sealing section. The sealing section is arranged close to the pyrolysis pool body. The inner diameter of the sealing section is gradually reduced from the pyrolysis pool body to the air inlet section. A sealing ring is arranged in the sealing section. The sealing ring forms a pressing surface that is pressed and adheres to the pyrolysis pool body after being pressed on the sample loading end.
[0007] Specifically, the sample loading through-hole also includes a sample inlet section, which connects the outside world with the air inlet section. The carrier gas outlet, which connects the air inlet channel and the sample loading through-hole, is located in the air inlet section. The sample tube is inserted into the sealing ring and enters the air inlet section through the sealing section. The inner diameter of the sample inlet section is smaller than the diameter of the sample tube, forming a limiting structure at the end of the sample tube.
[0008] Specifically, it also includes a sealing connector and a sample injection needle. The sealing connector is connected to the sample outlet end and has a slot for the end of the sample injection needle to pass through. The sample injection needle communicates with the sample outlet through the sealing connector to form an airtight passage from the sample tube to the sample injection needle.
[0009] Specifically, the injection needle includes a needle tip and a needle seat. The bayonet allows the needle tip to pass through and limits the needle seat. The sealing connector is connected to the sample outlet end by threads, forming a compression sealing structure in which the sample outlet end abuts against the needle seat through the threads.
[0010] Specifically, a second heating element is installed inside the pyrolysis tank. The first heating element is arranged around the sample tube inside the pyrolysis chamber, and the second heating element is arranged near the carrier gas channel to form a heating element for the tank.
[0011] Specifically, it also includes a sample injection device, with a sealing connector and an analytical instrument connected to its two ends respectively. The sample injection device has a through hole for the needle to pass through, the sealing connector has a protrusion facing the sample injection device, and the sample injection device has a groove that matches the protrusion, forming a nested support structure at the connection between the two.
[0012] Specifically, the sample loading end has a multi-tube opening 1 that communicates with the sample loading through hole, and the sample discharging end has a multi-tube opening 2 that communicates with the sample discharging through hole. The multi-tube opening 1 and the multi-tube opening 2 form a backflush passage between the sealing end and the sample tube.
[0013] Advantages and effects
[0014] By setting up a carrier gas channel to preheat the carrier gas before it enters the sample tube, sample condensation and unstable heating temperature are avoided; by connecting the sealed end to the sample tube, the pipeline path between sample injection and heating is reduced, while the airtightness of the device is increased; by setting up a second heating element to heat the pyrolysis cell and carrier gas channel separately, the size and weight of the device can be further reduced, while rapid heating is possible under higher temperature pyrolysis conditions. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the structure of this utility model;
[0016] Figure 2 This is a schematic diagram of the structure of the sample loading end of this utility model;
[0017] Figure 3 This is a structural schematic diagram of the sample outlet position of this utility model.
[0018] Legend: 1. Pyrolysis tank; 11. Pyrolysis chamber; 12. Carrier gas channel; 13. Heating element one; 14. Heating element two; 2. Sample tube; 3. Sealed end; 31. Sample loading end; 311. Sample loading through hole; 3111. Sample inlet section; 3112. Gas inlet section; 3113. Sealed section; 312. Gas inlet channel; 313. Sealing ring; 314. Multi-tube opening one; 32. Sample outlet end; 321. Sample outlet through hole; 322. Carrier gas hole; 323. Multi-tube opening two; 4. Sealing connector; 41. Bayonet; 5. Injection needle; 51. Needle tip; 52. Needle seat; 6. Injection fastener. Detailed Implementation
[0019] The present invention will be further described below with reference to embodiments, but is not limited to the contents of the specification.
[0020] Unless otherwise expressly defined, the use of terms such as "first," "second," or "third" in the claims, description, and drawings of this utility model is for distinguishing different objects and not for describing a specific order.
[0021] Unless otherwise expressly defined, in the claims, description, and accompanying drawings of this utility model, the use of directional terms such as "center," "lateral," "longitudinal," "horizontal," "vertical," "top," "bottom," "inner," "outer," "upper," "lower," "front," "rear," "left," "right," "clockwise," and "counterclockwise" to indicate orientation or positional relationships is based on the orientation and positional relationships shown in the accompanying drawings and is only for the convenience of describing this utility model and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the specific protection scope of this utility model.
[0022] Unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" used in the claims, description and drawings of this utility model shall be interpreted broadly to refer to any connection in which there is no displacement or relative rotation relationship between the two parties, including non-removable fixed connection, detachable fixed connection, integral connection and fixed connection through other devices or components.
[0023] In the claims, description and accompanying drawings of this utility model, the terms "comprising", "having", and variations thereof are used to mean "including but not limited to".
[0024] like Figures 1-3As shown, this utility model relates to a high-temperature pyrolysis sample introduction device, which includes a pyrolysis cell 1 and a sample tube 2. The pyrolysis cell 1 is a metal block structure with thermal conductivity. A pyrolysis chamber 11 and a carrier gas channel 12 are opened inside the pyrolysis cell 1. A heating element 13 and the sample tube 2 are arranged in the pyrolysis chamber 11. The heating element 13 can heat the pyrolysis chamber 11 and the sample tube 2, and heat the carrier gas channel 12 through the thermal conductivity of the pyrolysis cell 1. One end of the carrier gas channel 12 is connected to the carrier gas, and the other end... The sample tube 2 is connected to form a preheating path that can be heated by the carrier gas channel 12 before the carrier gas enters the sample tube 2. The sample tube 2 is heated at high temperature by the heating element 13, so that the sample in the sample tube 2 is heated to desorb or vaporize. At the same time, the pyrolysis chamber 11 keeps the heated area warm. Preferably, the pyrolysis tank 1 is made of aluminum alloy. The strong thermal conductivity of aluminum alloy is further utilized. A large amount of heat generated in the pyrolysis chamber 11 is conducted to the surrounding area, so that the pyrolysis tank 1 is heated and the carrier gas channel 12 is heated.
[0025] Under high-temperature pyrolysis conditions, if the carrier gas introduced is still at room temperature, it will cause the temperature of the sample to drop after contact with the pyrolyzed sample, resulting in sample condensation and adhesion in the pipeline. Furthermore, the sample tube temperature will drop suddenly after entering the sample tube, causing a decrease in detection accuracy and potentially damaging the device. However, by using the heating effect of the pyrolysis tank 1 on the carrier gas channel 12, the carrier gas is heated after entering the carrier gas channel 12. In this way, the carrier gas entering the sample tube 2 is further heated in the pyrolysis chamber 11, avoiding the significant drop in temperature of the vaporized sample that would cause condensation and adverse effects on the accuracy of sample detection.
[0026] The sample tube 2 and the carrier gas channel 12 are arranged in a continuous manner from top to bottom along the pyrolysis tank 1. A sealing end 3 is provided on the pyrolysis tank 1. The sealing end 3 includes a sample loading end 31 and a sample discharging end 32. The port of the carrier gas channel 12 and the sample tube 2 located at the top of the pyrolysis tank 1 is connected through the sample loading end 31. The sample loading end 31 has a sample loading through hole 311 and an air inlet 312. The sample loading through hole 311 passes through the sample loading end 31 and is connected to the outside and the sample tube 2 respectively, forming a channel that can release the sample into the sample tube 2. One end of the air inlet 312 is connected to the carrier gas channel 12, and the other end is connected to the middle section of the sample loading through hole 311. The sample discharging end 32 has a sample discharging through hole 321 that passes through the sample discharging end 32. The sample tube 2 is connected to the sample tube 2 to form a sample outlet channel. The sealing end 3 is tightly connected to the pyrolysis tank 1. Sealing gaskets or rings are set between the sample loading and outlet holes and the sample tube 2, and between the port of the air inlet 312 and the port of the carrier gas channel 12. At the same time, the sample tube 2 is directly connected to the sealing end 3, reducing intermediate transition components to improve the overall pipeline sealing. The air inlet 312 is used to connect the carrier gas channel 12 and the sample loading hole 311, so that the carrier gas is preheated through the carrier gas channel 12 and enters the sample tube 2 through the sample loading end 31. A sealing cap can also be set at the end of the sample loading end 31. After the sample is placed in the heating area of the sample tube 2 through the sample loading hole 311, the sealing cap is closed to avoid external influence and contamination of the sample area.
[0027] like Figure 2 As shown, further, the sample loading end 31 is fitted with the pyrolysis tank body 1 in a planar manner to form a thermally conductive contact surface. The air inlet 312 is set along the thermally conductive contact surface to form a heat-insulating section. Preferably, the sample loading end 31 is made of metal. In this way, after the carrier gas is preheated through the carrier gas channel 12, it enters the air inlet 312 of the sample loading end 31. Due to the heat rise of the pyrolysis tank body 1 itself, the heat is conducted to the air inlet 312 of the sample loading end 31, thus insulating the carrier gas. The sample outlet end 32 has a carrier gas hole 322 at the position corresponding to the carrier gas channel 12 and communicates with the carrier gas. The sample outlet end 32 forms the carrier gas inlet. The sample outlet end 32 is provided with a sealing ring at the position corresponding to the carrier gas hole 322 and the port of the carrier gas channel 12 to seal the connection. The sealing end 3 is used to connect multiple carrier gas and sample ports at both ends of the pyrolysis tank body 1, reducing the heat loss of the tank body caused by directly opening the pyrolysis tank body 1 and improving the temperature stability during the operation of the equipment.
[0028] The sample loading through-hole 311 includes an air inlet section 3112 and a sealing section 3113. The sealing section 3113 is located close to the pyrolysis cell body 1, and the inner diameter of the sealing section 3113 gradually decreases from the pyrolysis cell body 1 to the air inlet section 3112. A sealing ring 313 is provided inside the sealing section 3113, forming a pressing surface on the sample loading end 31 where the sealing ring 313 is pressed and fits towards the pyrolysis cell body 1. The sample loading end 31 can be connected by a threaded locking member. By adjusting the locking member, the sample loading end 31 is pressed towards the pyrolysis cell body 1. Because the diameter of the sealing section 3113 is small in the direction away from the pyrolysis cell body 1, the inner wall is inclined. After being squeezed, the sealing ring 313 deforms towards the pyrolysis cell body 1, further sealing the gap between the sample loading end 31 and the pyrolysis cell body 1, preventing gas leakage and sample contamination.
[0029] The sample loading through-hole 311 also includes a sample inlet section 3111, which connects to the outside and the air inlet section 3112. The carrier gas outlet, which connects the air inlet 312 and the sample loading through-hole 311, is located in the air inlet section 3112. The sample tube 2 is inserted into the sealing ring 313 and enters the air inlet section 3112 through the sealing section 3113. The inner diameter of the sample inlet section 3111 is smaller than the diameter of the sample tube 2, forming a limiting structure at the end of the sample tube 2. The sample inlet section 3111 corresponds to the port position of the sample tube 2. In this way, the sample inlet and the carrier gas inlet are separated between the sample loading through-hole 311, reducing the contamination of the carrier gas pipeline by the sample and impurities and improving the accuracy of detection.
[0030] like Figure 3 As shown, it also includes a sealing connector 4 and an injection needle 5. The sealing connector 4 is connected to the sample outlet end 32. The sealing connector 4 has a bayonet 41 for the end of the injection needle 5 to pass through. The injection needle 5 is connected to the sample outlet through hole 321 through the sealing connector 4 to form an airtight passage from the sample tube 2 to the injection needle 5. The injection needle 5 has a small tube inside for passing the vaporized sample into the detection and analysis instrument. The sealing connector 4 can be directly fixed to the injection needle 5 as an integral structure, or a sealing gasket can be set at the connection position between the injection needle 5 and the sealing connector 4 to improve the airtightness.
[0031] The injection needle 5 includes a needle tip 51 and a needle seat 52. A bayonet 41 allows the needle tip 51 to pass through and limits the needle seat 52. A sealing connector 4 is threadedly connected to the sample outlet end 32, forming a compression sealing structure in which the sample outlet end 32 abuts against the needle seat 52 through the thread. The bayonet 41 is adapted to the shape of the needle seat 52. By adjusting the sample outlet end 32 and the sealing connector 4 to face the bayonet 41 and abut against the needle seat 52, pressure is used to seal the connection position. The sample outlet end 32 can directly abut against the needle seat 52 and connect the sample outlet through hole 321 to the injection needle 5. Alternatively, a sealing gasket with a through hole can be provided between the sample outlet end 32 and the needle seat 52. The sample outlet end 32 achieves a sealed connection with the injection needle 5 by squeezing the sealing gasket.
[0032] likeFigure 1 As shown, depending on the different decomposition temperatures of the samples and the different analytical instruments, different levels of high temperature are required during pyrolysis. Furthermore, when the pyrolysis temperature reaches above 800℃, in order to meet the need for rapid heating of the pyrolysis tank, the volume of the pyrolysis tank 1 is further reduced. At the same time, the length of the carrier gas channel 12 and the carrier gas intake are also reduced accordingly. Therefore, a second heating element 14 is set in the pyrolysis tank 1. The first heating element 13 is arranged around the sample tube 2 in the pyrolysis chamber 11. The second heating element 14 is arranged close to the carrier gas channel 12 to form a tank heating element. By heating the pyrolysis tank 1 and the sample tube 2 respectively, it is possible to achieve rapid heating of the pyrolysis tank 1, avoid the sample heating instability caused by excessive temperature difference between the tank and the pyrolysis chamber 11, and at the same time increase the preheating temperature of the carrier gas channel 12 to avoid condensation of the vaporized sample.
[0033] Multiple carrier gas channels 12 can be set inside the pyrolysis tank 1, and corresponding gas passages can be set on the sealed end 3 to extend the carrier gas preheating time and increase the temperature of the carrier gas when it is introduced into the sample tube 2.
[0034] It also includes a sample injection device 6, with sealing connector 4 and analytical instrument connected to its two ends respectively. The sample injection device 6 has a through hole for the needle 51 to pass through, and the needle 51 passes through the sample injection device 6 to connect to the analyzer. The sample injection device 6 connects the pyrolysis device and the analytical instrument and is made of thermally conductive metal. Therefore, the sample injection device 6 is heated by the pyrolysis tank 1 and the heating device of the analytical instrument, and the sample is kept warm at the connection position between the injection needle 5 and the analytical instrument to prevent the sample from condensing in the pipeline and the injection needle 5. The sealing connector 4 has a protrusion facing the sample injection device 6, and the sample injection device 6 has a groove that matches the protrusion, forming a nested support structure at the connection between the two. The nested structure increases the contact area and makes the connection structure more stable. At the same time, it minimizes the path between the pyrolysis injection device and the analytical instrument, improves the detection efficiency, and reduces the impact of multiple intermediate devices and airtightness on the detection accuracy due to the direct injection of the injection needle 5.
[0035] The sample loading end 31 has a multi-tube opening 314 connected to the sample loading through hole 311, and the sample discharging end 32 has a multi-tube opening 323 connected to the sample discharging through hole 321. The multi-tube opening 314 and the multi-tube opening 323 form a backflush passage between the sealed end 3 and the sample tube 2. The multi-tube opening 314 can be directly connected to the carrier gas. For example, when the pyrolysis temperature of the device is less than 800°C, the carrier gas can be quickly heated to the sample delivery temperature after entering the sample tube 2. After reaching the pyrolysis zone, the sample is less likely to condense. Therefore, when there is no need to preheat the carrier gas, the sample can be sent into the analyzer directly through the multi-tube opening 314. After the pyrolysis sample injection device is used up, the multi-tube opening 323 can be connected to the carrier gas or cleaning agent, and the multi-tube opening 314 can be connected to the waste gas treatment device. Backflush is performed from one end of the sample discharging through hole 321 to the other end of the multi-tube opening 314 of the sample loading through hole 311 to blow out and clean the device and the sample tube 2.
[0036] Preferably, a ceramic heat insulation ring is provided around the heating element 13 at the pyrolysis sample position in the pyrolysis chamber 11, so that the position can be heated quickly and stably. At the same time, a temperature sensing element such as a platinum resistance thermometer is provided inside the ceramic heat insulation ring for real-time monitoring and control of the heating temperature. Preferably, the heating element 13 is heated by platinum wire, which can achieve a higher heating temperature and directly act as a temperature sensing element to control the pyrolysis process.
[0037] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the embodiments of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is impossible to exhaustively list all embodiments here. All obvious variations or modifications derived from the technical solutions of this utility model are still within the protection scope of this utility model.
Claims
1. A high temperature thermal cracking sample introduction device, characterized by, It includes pyrolysis pool body (1) and sample tube (2), the pyrolysis pool body (1) is the metal block structure with heat conduction performance, and the pyrolysis pool body (1) is internally provided with pyrolysis cavity (11) and carrier gas channel (12), the pyrolysis cavity (11) is provided with heating element one (13) and sample tube (2), the heating element one (13) can heat pyrolysis cavity (11) and sample tube (2) by heating carrier gas channel (12) through the heat conduction of pyrolysis pool body (1), one end of the carrier gas channel (12) is communicated with carrier gas, and the other end is communicated with sample tube (2) to form preheating passage that can be heated by carrier gas channel (12) before carrier gas enters sample tube (2).
2. The high temperature thermal cracking sample introduction device of claim 1, wherein, The sample tube (2) and carrier gas channel (12) are provided through along the pyrolysis pool body (1) from top to bottom direction, the pyrolysis pool body (1) is provided with sealing end head (3), the sealing end head (3) includes upper sample end head (31) and sample outlet end head (32), the carrier gas channel (12) and sample tube (2) are located at the port of the top of the pyrolysis pool body (1) and are communicated through the upper sample end head (31), the upper sample end head (31) is provided with upper sample through hole (311) and gas inlet channel (312), the upper sample through hole (311) is through the upper sample end head (31) and is respectively communicated with the outside and sample tube (2), forming a channel that can be put into sample tube (2), one end of the gas inlet channel (312) is communicated with the carrier gas channel (12), and the other end is communicated with the middle section of the upper sample through hole (311), the sample outlet end head (32) is provided with sample outlet through hole (321) through the sample outlet end head (32), and the sample outlet through hole (321) is communicated with the sample tube (2) to form a sample outlet channel.
3. The high temperature thermal cracking sample introduction device of claim 2, wherein, The upper sample end head (31) is arranged in surface shape with the pyrolysis pool body (1) to form a heat conduction contact surface, the gas inlet channel (312) is arranged along the heat conduction contact surface to form a heat preservation section, the sample outlet end head (32) is provided with carrier gas hole (322) corresponding to the position of the carrier gas channel (12) and is communicated with the carrier gas to form the entry end of the carrier gas on the sample outlet end head (32).
4. The high temperature thermal cracking sample introduction apparatus of claim 2, wherein, The upper sample through hole (311) includes gas inlet section (3112) and sealing section (3113), the sealing section (3113) is arranged close to the pyrolysis pool body (1), and the inner diameter of the sealing section (3113) is gradually reduced from the pyrolysis pool body (1) to the gas inlet section (3112), a sealing ring (313) is arranged in the sealing section (3113), and a compression surface of the sealing ring (313) is formed on the upper sample end head (31) and is attached to the pyrolysis pool body (1) after being pressed.
5. The high temperature thermal cracking sample introduction device of claim 4, wherein, The upper sample through hole (311) further includes sample inlet section (3111), the sample inlet section (3111) is communicated with the outside and the gas inlet section (3112), the carrier gas outlet of the gas inlet channel (312) communicated with the upper sample through hole (311) is arranged in the gas inlet section (3112), the sample tube (2) is inserted into the sealing ring (313) and enters the gas inlet section (3112) from the sealing section (3113), and the inner diameter of the sample inlet section (3111) is smaller than the pipe diameter of the sample tube (2) to form a limiting structure of the end of the sample tube (2).
6. The high temperature thermal cracking sample introduction device of claim 2, wherein, It also includes a sealed connector (4) connected with the sample outlet end head (32), and a sample injection needle (5), the sealed connector (4) is provided with a bayonet (41) for the end of the sample injection needle (5) to pass through, the sample injection needle (5) communicates with the sample outlet through hole (321) through the sealed connector (4), forming an airtight path from the sample tube (2) to the sample injection needle (5).
7. The high temperature thermal cracking sample introduction device of claim 6, wherein, The sample injection needle (5) includes a needle head (51) and a needle seat (52), the bayonet (41) is for the needle head (51) to pass through and limit the needle seat (52), the sealed connector (4) is connected with the sample outlet end head (32) through threads, forming a compression sealing structure that the sample outlet end head (32) is pressed against the needle seat (52) through threads.
8. The high temperature thermal cracking sample introduction device of claim 2, wherein, The pyrolysis cell body (1) is provided with a heating element two (14), the heating element one (13) is arranged around the sample tube (2) in the pyrolysis cavity (11), and the heating element two (14) is arranged close to the carrier gas channel (12) to form a cell body heating element.
9. The high temperature thermal cracking sample introduction apparatus of claim 6, wherein, It also includes a sample injection solid (6), the two ends of the sample injection solid (6) are respectively connected with the sealed connector (4) and the analytical instrument, the sample injection solid (6) is provided with a through hole for the needle head (51) to pass through, the sealed connector (4) has a convex part towards the sample injection solid (6), the sample injection solid (6) has a groove matched with the convex part, forming a nested support structure at the connection between the two.
10. The high temperature thermal cracking sampling device of any one of claims 2-9, wherein, The sample loading end head (31) is provided with a multi-tube opening one (314) communicating with the sample loading through hole (311), the sample outlet end head (32) is provided with a multi-tube opening two (323) communicating with the sample outlet through hole (321), the multi-tube opening one (314) and the multi-tube opening two (323) form a back flushing path between the sealed end head (3) and the sample tube (2).