Lightweight thermal cracking sample injector

Abstract

The utility model relates to a lightweight thermal cracking sample introduction instrument, which comprises a pyrolysis device body and a connecting firmware, the pyrolysis device body is connected with an analytical instrument through the connecting firmware, the connecting firmware is made of a heat conduction material, and a heat exchange part capable of transferring heat of the analytical instrument to the pyrolysis device body is formed. The pyrolysis device body comprises a sample tube and a sample introduction connecting piece with a sample introduction channel, the sample introduction channel of the sample introduction connecting piece is communicated with the sample tube, the connecting fixing piece is provided with a through hole through which the end part of the sample introduction connecting piece passes, and the sample introduction connecting piece is connected with the connecting fixing piece to enable the sample introduction channel to be communicated with an analytical instrument; by means of the pyrolysis device, the size of the pyrolysis device can be reduced, a sample introduction path can be shortened, meanwhile, the temperature uniformity of the pyrolysis device is improved, and sample loss is avoided.

Description

Technical Field

[0001] This utility model relates to the field of analytical instruments, and in particular to a lightweight pyrolysis sample injector. Background Technology

[0002] When analyzing complex polymer samples, such as gas chromatography or Fourier transform infrared spectroscopy, the sample needs to be heated to a high temperature to vaporize or desorb before being passed into the analytical equipment for further detection. However, existing pyrolysis equipment is complex in structure and large in size, often requiring a large support to connect to the analyzer, making installation and operation complicated. It is difficult to meet the needs of scenarios requiring miniaturization and portability. Furthermore, existing pyrolysis equipment also faces the problem of uneven temperature distribution during the pyrolysis process. Especially in small equipment, it is difficult to ensure uniform heat distribution, resulting in incomplete heating or overheating of the sample, which affects the accuracy of the analytical results. Utility Model Content

[0003] To address the aforementioned technical problems, this utility model discloses a lightweight pyrolysis sample injector, comprising a pyrolysis device body and connecting fasteners. The pyrolysis device body is connected to an analytical instrument via the connecting fasteners, which are made of thermally conductive material and form a heat exchange component that allows heat from the analytical instrument to be transferred to the pyrolysis device body. The pyrolysis device body includes a sample tube and an injection connector with an injection channel. The injection channel of the injection connector is connected to the sample tube. The connecting fasteners have through holes for the end of the injection connector to pass through. The injection connector connects to the connecting fasteners, allowing the injection channel to connect to the analytical instrument, thus forming an airtight passage between the pyrolysis device body and the analytical instrument.

[0004] Specifically, the injection connector includes an injection needle and a sealing end. The injection needle and the sealing end are in airtight communication. The center of the connector has a through hole for the injection needle to pass through, and one end of the through hole has a stepped groove that matches the sealing end. The other end of the through hole is connected to the analytical instrument. The connector and the injection connector form a detachable structure in which the connector is fixed to the sealing end after the injection needle passes through the through hole.

[0005] Specifically, the sealing end abuts against the end face of the connecting fastener, and the sealing end has a boss that fits into the groove of the connecting fastener, forming a nested heat transfer structure between the sealing end and the connecting fastener.

[0006] Specifically, the pyrolysis device body also includes a shell and a sealing connector. The sealing connector is connected to the shell and the sample inlet connector respectively. The sealing connector and the shell are fitted together in a surface shape to form a thermally conductive contact surface. The sealing connector has a through hole that communicates with the sample inlet connector. A pyrolysis chamber is formed inside the shell. The sample tube is placed inside the pyrolysis chamber. One end of the sample tube is the sample release end, and the other end passes through the shell and communicates with the through hole of the sealing connector in an airtight manner, forming a sample inlet path from the sample tube to the sample inlet connector.

[0007] Specifically, the sealing connector is equipped with a locking element and a sealing ring. The sealing ring is located at the connection between the sample tube and the sealing connector. The sealing ring abuts against both the sample tube and the sealing connector. The sealing connector is connected to the housing through the locking element, and the sealing ring is pressed by the locking element to form a sealing structure.

[0008] Specifically, a heating element is arranged around the sample tube inside the pyrolysis chamber, and a heat insulation ring is sleeved on the outside of the heating element to form a pyrolysis section on the sample tube.

[0009] Specifically, the shell has grooves and an opening that connects the pyrolysis chamber to the shell. Multiple grooves are provided and arranged side by side on the surface of the shell.

[0010] Specifically, the shell is a cubic structure with multiple heat dissipation surfaces. The opening is located on the heat dissipation surface on one side of the block structure. A support frame is installed on the side of the shell with the opening, and a heat dissipation device is installed on the support frame, forming a heat dissipation structure that allows heat exchange between the inside and outside of the shell.

[0011] Specifically, it also includes a sample loading end, which is set on the pyrolysis device body. The sample loading end has a sample loading through hole inside, which is connected to the sample release end of the sample tube to form an airtight passage connecting the sample loading through hole, the sample tube and the sample injection connector.

[0012] Specifically, the sample loading end is also equipped with a carrier gas hole. One end of the carrier gas hole is connected to the sample loading through hole, and the other end is connected to the carrier gas, forming a carrier gas passage through which the airflow enters the sample tube via the sample loading end.

[0013] Advantages and effects

[0014] Heat exchange is established between the analytical instrument and the pyrolysis device body through thermally conductive connecting fasteners, avoiding uneven temperature distribution in the equipment and heat loss during sample injection of vaporized samples, thus improving the accuracy of analysis; the nested combination of the sealed end and connecting fasteners results in a small dead volume of the device, making the pyrolysis equipment connection stable and improving heat transfer efficiency; the grooves, openings and heat dissipation racks on the shell enable rapid cooling of the pyrolysis device after heating. Attached Figure Description

[0015] Figure 1 This is one of the structural schematic diagrams of this utility model;

[0016] Figure 2 This is the second structural schematic diagram of the present invention;

[0017] Figure 3 This is a schematic diagram of the shell and support frame of this utility model.

[0018] Legend: 1. Pyrolysis apparatus body; 11. Sample tube; 12. Sample inlet connector; 121. Sample inlet needle; 122. Sealing end; 13. Shell; 131. Pyrolysis chamber; 132. Groove; 133. Opening; 14. Sealing connector; 141. Locking element; 142. Sealing ring; 15. Heating element; 16. Heat insulation ring; 17. Support frame; 171. Heat dissipation device; 2. Connecting fastener; 3. Sample loading end; 31. Sample loading through hole; 32. Carrier gas hole. 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 Figure 1-3As shown, this utility model relates to a lightweight pyrolysis sample injector, which includes a pyrolysis device body 1 and a connecting fastener 2. The pyrolysis device body 1 is connected to an analytical instrument via the connecting fastener 2. The connecting fastener 2 is made of a thermally conductive material and forms a heat exchange component that allows the heat from the analytical instrument to be transferred to the pyrolysis device body 1. The analytical instrument can be an analytical device such as a gas chromatograph or mass spectrometer, which is used in environments with high detection temperatures or where the analyte requires heating. For example, when using a gas chromatograph to detect a sample, the chromatograph's heating chamber or other heating device is connected to the connecting fastener 2 at one end of the sample injection, and the other end of the connecting fastener 2 is connected to the pyrolysis device body 1.

[0025] The pyrolysis apparatus body 1 includes a sample tube 11 and a sample inlet connector 12 with a sample inlet channel. The sample inlet channel of the sample inlet connector 12 is connected to the sample tube 11. The connecting fastener 2 has a through hole for the end of the sample inlet connector 12 to pass through. The sample inlet connector 12 connects to the connecting fastener 2, allowing the sample inlet channel to connect to the analytical instrument, forming an airtight passage between the pyrolysis apparatus body 1 and the analytical instrument. The sample inlet connector 12 can be directly connected to the analytical instrument through the sample inlet channel, or it can be airtightly connected to the connecting fastener 2, allowing the sample to be tested to enter the connecting fastener 2 through the sample inlet connector 12 and then enter the analytical instrument for detection and analysis. After the sample in the sample tube 11 is heated and decomposed, the sample to be tested is injected into the analytical instrument through the sample inlet connector 12 by injecting carrier gas. The heat generated by the analytical instrument during the detection process is transferred to the connecting fastener 2 and the sample inlet connector 12, keeping the sample flow passage at a high temperature. This prevents the sample from cooling and condensing midway and adhering to the tube wall, which would cause errors in the final detection results.

[0026] The thermally conductive connecting fastener 2 conducts heat to the pyrolysis device body 1, so that even with a reduced volume and a relatively increased specific surface area, the device body will not experience uneven temperature distribution due to excessive heat dissipation. At the same time, the formation of temperature conduction enables the pyrolysis equipment to respond quickly during the heating stage, avoiding uneven temperature caused by the temperature difference between the outer shell and the internal heating area, which could lead to incomplete heating or overheating.

[0027] like Figure 2 As shown, the injection connector 12 includes an injection needle 121 and a sealing end 122. The injection needle 121 and the sealing end 122 are in airtight communication. The connecting fastener 2 has a through hole in the center for the injection needle 121 to pass through. One end of the through hole is provided with a stepped groove that is adapted to the sealing end 122. The other end of the through hole is connected to the analytical instrument. The connecting fastener 2 and the injection connector 12 form a detachable structure in which the connecting fastener 2 and the sealing end 122 are connected and fixed after the injection needle 121 passes through the through hole.

[0028] The injection needle 121 is disposed at the end of the sealing end 122. The injection needle 121 can be fixedly connected to the sealing end 122 as a whole, or a sealing element can be used to form an airtight connection between the injection needle 121 and the sealing end 122. The injection needle 121 includes a needle tip and a needle seat, which are fixedly connected. The sealing end 122 has a channel for the injection needle 121 to pass through and to hold the needle seat to form a connection. A sealing ring is provided between the two. The sealing end 122 is attached to and fixed to the surface of the connecting fastener 2. In this way, the sealing end 121 is sealed. The increased contact surface between the 22 and the connecting fastener 2 reduces pores and improves heat transfer efficiency. The other end of the connecting fastener 2 is adapted to and connected to the sample inlet of the analytical instrument. At the same time, the injection needle 121 passes through the through hole and enters the analytical instrument. The direct connection between the injection needle 121 and the analytical instrument reduces the problem of reduced airtightness caused by too many intermediate devices. It also reduces the path between the sample and the analytical instrument, further improving the space utilization rate. This allows the pyrolysis equipment to be further lightweight and works in conjunction with the connecting fastener 2 to form a stable pyrolysis sample injection operation.

[0029] The sealing end 122 abuts against the end face of the connecting fastener 2, and the sealing end 122 has a boss that fits into the groove of the connecting fastener 2. The inner wall of the groove of the connecting fastener 2 fits against the outer wall of the boss of the sealing end 122. The sealing end 122 and the connecting fastener 2 form a nested heat transfer structure. The sealing end 122 is embedded in the connecting fastener 2 in a platform-like structure. The fitting structure fixes the connection position. The end face and outer wall of the sealing end 122 fit against the connecting fastener 2, increasing the contact area while reducing the exposed area of ​​the sealing end 122, thus reducing heat dissipation. Preferably, fasteners can be added to lock and fit the sealing end 122 and the connecting fastener 2 together, stabilizing the equipment and further increasing the heat transfer efficiency.

[0030] The pyrolysis apparatus body 1 also includes a housing 13 and a sealing connector 14. The sealing connector 14 is connected to the housing 13 and the sample inlet connector 12 respectively. The sealing connector 14 and the housing 13 are fitted together in a surface shape to form a thermally conductive contact surface. The sealing connector 14 has a through hole that communicates with the sample inlet connector 12. A pyrolysis chamber 131 is formed inside the housing 13. The sample tube 11 is placed inside the pyrolysis chamber 131. One end of the sample tube 11 is the sample outlet end, and the other end passes through the housing 13 and communicates with the through hole of the sealing connector 14 in an airtight manner, forming a sample inlet path from the sample tube 11 to the sample inlet connector 12.

[0031] The sealing connector 14 has a through hole, through which the sample tube 11 is connected to the injection connector 12, allowing the heated sample to enter the analyzer through the injection needle 121. Due to the pyrolysis chamber 131, there is a cavity between the sample tube 11 and the shell 13. The sample is heated and decomposed in the sample tube 11, and the cavity forms a heat preservation chamber to maintain the uniform temperature of the pyrolysis chamber 131. The sample is placed in the middle of the sample tube 11 in the pyrolysis chamber 131. When heating is completed and carrier gas is introduced for subsequent sample injection analysis, the carrier gas enters the sample tube 11. Due to the heating of the sample tube 11 and the heat preservation effect in the pyrolysis chamber 131, the temperature rises rapidly, preventing the sample from suddenly dropping in temperature and condensing after pyrolysis. After entering the sealing connector 14 from the sample tube 11, the sample remains stable due to the heat transfer effect of the connecting fastener 2 and enters the analyzer for detection and analysis.

[0032] Furthermore, a sealing baffle is provided between the sealing connector 14 and the injection connector 12. The sealing baffle abuts against the needle seat of the sealing connector 14 and the injection needle 121 respectively. It has a through hole in the middle and the two ends of the through hole are connected to the sealing connector 14 and the injection needle 121 respectively. When the sealing connector 14 and the injection connector 12 are connected and fixed, as the two come closer to each other, the sealing baffle is pressed tightly against the communication position to form an airtight communication.

[0033] Preferably, the shell 13 is made of aluminum. Since aluminum has better thermal conductivity and specific heat capacity than steel, the shell 13 can quickly conduct heat through the connecting fastener 2 and the sealing fastener 14 to form a heat preservation for the pyrolysis chamber. At the same time, the lightweight aluminum material reduces the weight of the device body and reduces the strength requirements for the connection and fixation of the device. Therefore, the sealing fastener 14, the sample injection fastener 12 and the connecting fastener 2 can be further reduced in size. At the same time, the heat transfer efficiency is improved by increasing the contact surface.

[0034] The sealing connector 14 is provided with a locking element 141 and a sealing ring 142. The sealing ring 142 is located at the connection between the sample tube 11 and the sealing connector 14. The sealing ring 141 abuts against the sample tube 11 and the sealing connector 14 respectively. The sealing connector 14 is connected to the housing 13 through the locking element 141, and the sealing ring 142 is pressed by the locking element 141 to form a sealing structure.

[0035] The locking element 141 can be connected to the sealing connector 14 and the housing 13 by means of threads, which reduces the gap between the two thermally conductive contact surfaces, makes them fit tightly and improves the heat transfer efficiency. In addition, during the locking process, the sample tube 11 squeezes the sealing ring 141 to deform, and the sealing ring 141 blocks the gap at the connection position between the sample tube 11 and the sealing connector 14, further improving the airtightness of the device.

[0036] A heating element 15 is arranged around the sample tube 11 inside the pyrolysis chamber 131. A heat insulation ring 16 is sleeved on the outside of the heating element 15, forming a pyrolysis section on the sample tube 11. The heating element 1 is a heating wire. Preferably, the heating wire is sleeved around the sample tube 11 in the pyrolysis chamber 131 to form a full-section coverage. This allows the area of ​​the sample tube 11 where no sample is placed to be heated. After the carrier gas is introduced, the temperature can rise rapidly to stabilize the sample state. The heat insulation ring 16 is made of ceramic and is set on the outer layer of the heating wire. The sample is pyrolyzed and vaporized at this location. The heat insulation material further improves the heating rate of the heating element 15, allowing it to quickly reach the pyrolysis temperature in a short time. A platinum resistance thermometer is installed inside the heat insulation ring 16 for real-time measurement of the heating temperature.

[0037] like Figure 1 , Figure 3 As shown, after the pyrolysis is completed, in order to facilitate subsequent cleaning and reuse, the pyrolysis device body 1 needs to accelerate heat dissipation. Therefore, grooves 132 and openings 133 that connect the pyrolysis chamber 131 and the housing 13 are provided in the housing 13. Multiple grooves 132 are provided and arranged in parallel on the surface of the housing 13. The grooves 132 are evenly arranged on the surface of the housing 13 to increase the surface area of ​​the housing 13. The openings 133 are used to connect the pyrolysis chamber with the outside to form heat dissipation. The area of ​​the openings 133 is smaller than the area of ​​the grooves 132 to avoid heat loss during the pyrolysis process and uneven temperature inside the pyrolysis chamber.

[0038] Furthermore, the shell 13 is a block structure with multiple heat dissipation surfaces. The opening 133 is located on the heat dissipation surface on one side of the block structure. A support frame 17 is installed on the side of the shell 13 with the opening 133. A heat dissipation device 171 is installed on the support frame 17 to form an accelerated heat dissipation channel from the pyrolysis chamber 131 to the outside of the shell 13. The support frame 17 can be a shell structure with vent holes. The heat dissipation device 171 has a cooling fan. When the pyrolysis device body 1 is heated, the support frame 17 has the effect of blocking some foreign objects from entering the pyrolysis chamber 131 and reducing air convection. When the device needs to dissipate heat after the work is finished, the heat dissipation device 171 is turned on to quickly exhaust the internal hot air to cool the device.

[0039] like Figure 1As shown, the pyrolysis sample injector also includes a sample loading end 3, which is mounted on the pyrolysis device body 1. The sample loading end 3 has a sample loading through-hole 31 inside, which connects to the sample release end of the sample tube 11 to form an airtight passage connecting the sample loading through-hole 31, the sample tube 11, and the sample injection connector 12. The other end of the sample loading through-hole 31 connected to the sample tube 11 is equipped with a sealing cap or adapter port for sealing after sample placement or for connection and adaptation with other automated sample release equipment. Solid or liquid samples fall naturally into the sample tube 11 through the sample loading through-hole 31. A high-temperature resistant sponge or baffle can be placed at the pyrolysis section of the sample tube 11 for sample placement. The sample loading end 3 also has a carrier gas. One end of the port 32 is connected to the sample loading port 31, and the other end is connected to the carrier gas, forming a carrier gas passage through the sample loading end 3 into the sample tube 11. After the sample is released and the sample loading port 31 is closed, the device starts to heat up. After the sample decomposes, the carrier gas is introduced through the carrier gas port 32. After the high temperature heat conduction through the shell 13 and the sample tube 11, the carrier gas is heated and enters the analytical instrument through the injection needle 121 together with the vaporized sample for subsequent sample analysis. This minimizes the path of the sample from the pyrolysis device to the detection device, reduces the size of the device, and uses the heat conduction between the devices to keep the sample at a high temperature in the path, avoiding sample loss due to cooling and resulting in a decrease in analytical accuracy.

[0040] 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 light weight thermal cracking sample introduction apparatus, characterized by, It includes pyrolysis device body (1) and connecting fastener (2), the pyrolysis device body (1) is connected by connecting fastener (2) analysis instrument, the connecting fastener (2) is heat conducting material, and heat exchange piece is formed to make the heat of analysis instrument can be transferred to pyrolysis device body (1), pyrolysis device body (1) includes sample tube (11) and sample inlet connecting piece (12) with sample inlet channel, the sample inlet channel of sample inlet connecting piece (12) is communicated with sample tube (11), the connecting fastener (2) has the through hole for the end of sample inlet connecting piece (12) to pass through, sample inlet connecting piece (12) is connected with connecting fastener (2) to make sample inlet channel communicate analysis instrument, form airtight passage between pyrolysis device body (1) and analysis instrument.

2. The light-weight thermal pyrolysis sampler of claim 1, wherein, The sample inlet connecting piece (12) includes a sample needle (121) and a sealed end (122), the sample needle (121) is in airtight communication with the sealed end (122), the connecting fastener (2) has a through hole for the sample needle (121) to pass through, and one end of the through hole is provided with a stepped groove matched with the sealed end (122), the other end of the through hole is communicated with the analysis instrument, the connecting fastener (2) and the sample inlet connecting piece (12) form a detachable structure when the sample needle (121) passes through the through hole, and the connecting fastener (2) and the sealed end (122) are fixedly connected.

3. The light-weight thermal pyrolysis sampler of claim 2, wherein, The sealed end (122) abuts against the end face of the connecting fastener (2), and the sealed end (122) has a boss fitted into the groove of the connecting fastener (2), and the sealed end (122) and the connecting fastener (2) form a nested heat transfer structure.

4. The light-weight thermal pyrolysis sampler of claim 1, wherein, The pyrolysis device body (1) further includes a housing (13) and a sealing connecting piece (14), the sealing connecting piece (14) is connected with the housing (13) and the sample inlet connecting piece (12) respectively, and the sealing connecting piece (14) is arranged in surface contact with the housing (13) to form a heat-conducting contact surface, a through hole is formed in the sealing connecting piece (14) and communicated with the sample inlet connecting piece (12), the housing (13) is provided with a pyrolysis cavity (131) therein, the sample tube (11) is arranged in the pyrolysis cavity (131), one end of the sample tube (11) is a sample discharge end, and the other end of the sample tube (11) passes through the through hole of the sealing connecting piece (14) and is in airtight communication with the sample inlet connecting piece (12) to form a sample inlet passage from the sample tube (11) to the sample inlet connecting piece (12).

5. The light-weight thermal pyrolysis sampler of claim 4, wherein, The sealing connecting piece (14) is provided with a locking member (141) and a sealing ring (142), the sealing ring (142) is arranged at the connection between the sample tube (11) and the sealing connecting piece (14), and the sealing ring (142) abuts against the sample tube (11) and the sealing connecting piece (14) respectively, the sealing connecting piece (14) is connected with the housing (13) through the locking member (141), and the sealing ring (142) is compressed to form a sealing structure through the locking member (141).

6. The light-weight thermal pyrolysis sampler of claim 4, wherein, A heating element (15) is arranged around the sample tube (11) in the pyrolysis cavity (131), and a heat insulation ring (16) is arranged outside the heating element (15) to form a pyrolysis section on the sample tube (11).

7. The light-weight thermal cracking sampler of claim 4, wherein, The shell (13) is provided with grooves (132) and openings (133) penetrating the pyrolysis cavity (131) and the shell (13), the grooves (132) are arranged in parallel on the surface of the shell (13).

8. The light-weight thermal cracking sampler of claim 7, wherein, The shell (13) is a cubic structure with multiple heat dissipation surfaces, the openings (133) are arranged on the heat dissipation surface of one side of the block structure, a support frame (17) is arranged on the side of the shell (13) provided with the openings (133), and a heat dissipation device (171) is arranged on the support frame (17), so that a heat exchange structure is formed between the inside and outside of the shell (13).

9. The light-weight thermal pyrolysis sampler of claim 1, wherein, It also comprises a sample loading end (3) arranged on the pyrolysis device body (1), and the sample loading end (3) is internally provided with a sample loading through hole (31) in communication with the sample loading end of the sample tube (11) to form a gas-tight passage in communication with the sample loading through hole (31), the sample tube (11) and the sample inlet connecting piece (12).

10. The light-weight thermal pyrolysis sampler of claim 9, wherein, The sample loading end (3) is further provided with a carrier gas hole (32) in communication with the sample loading through hole (31) at one end and with carrier gas at the other end to form a carrier gas passage through which the carrier gas passes through the sample loading end (3) and enters the sample tube (11).

Images