A new type of sealed high-temperature oven test probe

Abstract

This invention belongs to the technical field of gas detection equipment, specifically relating to a novel test probe for a sealed high-temperature oven. The test probe includes a built-in detection sensing unit inside the oven and an instrument transmitter unit outside the oven. Its key feature is that it further includes a flange connection assembly and an insulating sealing assembly. The flange connection assembly includes a first flange tube and a second flange tube. The first flange tube is fixed to the upper end of the built-in detection sensing unit, and the second flange tube is detachably fixed to the upper end of the first flange tube by screws. The second flange tube and the instrument transmitter unit are threadedly connected. This invention uses a Teflon insulating substrate as the insulating carrier for multiple conductive pins. Utilizing the high-temperature resistance and stable insulation properties of Teflon, it isolates the high-temperature gas inside the oven, ensuring crosstalk-free electrical signal transmission under high-temperature conditions and achieving a continuous and stable output of combustible gas concentration detection signals within the oven.

Description

Technical Field

[0001] This invention belongs to the technical field of gas detection equipment, specifically relating to a novel test probe for use inside a sealed high-temperature oven. Background Technology

[0002] In industries such as chemical engineering, pharmaceuticals, lithium batteries, and semiconductors, high-temperature ovens are the most commonly used core equipment in high-temperature material processing. Their interiors are high-temperature, enclosed environments with strong circulating airflow. During operation, the materials being processed continuously release organic solvents, VOCs, and various decomposition gases, which, when mixed with the air inside the oven, can easily form explosive mixtures. Simultaneously, the oven's heating elements and inner walls are constantly at high temperatures, creating potential ignition sources. This forms a combustion triangle of "combustible material + oxidant + ignition source," resulting in an extremely high risk of explosion inside the oven. According to national standards such as GB14443-2025 "Safety Technical Requirements for Coating Drying Chambers" and AQ5214-2013 "Safety Performance Testing Methods for Drying Equipment," ovens must be equipped with combustible gas concentration monitoring devices, with the alarm threshold set at 25% of the lower explosive limit (LEL), and linked to safety mechanisms such as exhaust, power failure, and over-temperature protection. The gas detection probe, as the first line of defense, directly determines the protective effect of the entire safety system through its high-temperature stability and operational reliability.

[0003] Currently, high-temperature gas detection probes used in oven applications still have many safety hazards and performance shortcomings, making it difficult to fully adapt to the complex working conditions of sealed high temperatures. On the one hand, existing probes generally suffer from insufficient electronic transmission stability, and high-temperature environments can easily interfere with signal transmission, affecting the accuracy of detection data. On the other hand, the sealing and barrier performance of the probes is poor, and high-temperature flammable or toxic gases inside the oven can easily leak to the outside along the probe structure. At the same time, gases inside the oven can also invade the instrument head, accelerating the aging of components, leading to decreased instrument stability and shortened service life. In addition, conventional catalytic combustion gas detection probes do not fully consider high-temperature sealing and ease of installation and maintenance in their structural design, and cannot simultaneously meet the dual requirements of stable signal conduction and effective gas barrier at high temperatures.

[0004] In summary, considering the operating characteristics and safety requirements of sealed high-temperature ovens, developing a new type of high-temperature gas detection probe that combines reliable gas barrier capabilities, stable electronic signal transmission performance, and convenient installation and maintenance is an urgent need to improve the safety level of oven operations and ensure the continuous and stable operation of industrial production. It also has important practical significance for reducing production safety risks and promoting industrial safety compliance and green and low-carbon development. Summary of the Invention

[0005] The purpose of this invention is to provide a novel test probe for a sealed high-temperature oven. It uses a Teflon insulating substrate as the insulating carrier for multiple conductive needles, and utilizes the high temperature resistance and stable insulation properties of Teflon to isolate the high-temperature gas inside the oven, so that there is no crosstalk in the transmission of electrical signals under high-temperature conditions, and the combustible gas concentration detection signal inside the oven is continuously and stably output.

[0006] The specific technical solution adopted by this invention is as follows: A novel test probe for a sealed high-temperature oven includes a built-in detection and sensing unit inside the oven and an instrument transmission unit outside the oven. Its distinguishing feature is that it further includes a flange connection assembly and an insulation sealing assembly. The flange docking assembly includes a first flange tube and a second flange tube. The first flange tube is fixed to the upper end of the built-in detection sensing unit, and the second flange tube is detachably fixed to the upper end of the first flange tube by screws. The second flange tube and the instrument transmitter unit are threadedly connected. The first flange tube is configured to fix the probe as a whole on the oven, and the second flange tube is configured to dock the built-in detection sensing unit and the instrument transmitter unit. The insulating sealing assembly is assembled between the first flange pipe and the second flange pipe. The insulating sealing assembly is configured to block the leakage of high-temperature gas in the oven to the instrument transmission unit, while realizing the electrical signal conduction between the built-in detection sensing unit and the instrument transmission unit.

[0007] In a preferred embodiment, the insulating sealing assembly includes an insulating substrate and a plurality of conductive pins. A substrate positioning ring is provided on the outer side of the insulating substrate, and the insulating substrate is clamped between the first flange pipe and the second flange pipe through the substrate positioning ring. The plurality of conductive pins are clamped inside the insulating substrate insulated from each other, and the upper and lower ends of the conductive pins penetrate the insulating substrate. The lower end of the conductive pin and the built-in detection sensing unit, as well as the upper end of the conductive pin and the instrument transmission unit, are electrically connected. The insulating substrate is made of Teflon.

[0008] In a preferred embodiment, a first sealing element is provided between the insulating substrate and the first flange tube, and between the insulating substrate and the conductive needle column. The two first sealing elements are located at the upper and lower ends of the substrate positioning ring, respectively. The first sealing element and the first flange tube, as well as the first sealing element and the second flange tube, are all interference fits. The first sealing element is configured to prevent high-temperature gas from diffusing into the instrument transmission unit along the gap between the first flange tube and the insulating substrate, and between the second flange tube and the conductive needle column. Preferably, the first sealing element is an O-ring.

[0009] In a preferred embodiment, a limiting boss is provided at the lower end of the outer side of the conductive needle post, and a limiting groove is provided at the upper end of the outer side of the conductive needle post. A limiting spring is detachably engaged inside the limiting groove, and the conductive needle post and the insulating substrate are connected by the engagement of the limiting boss and the limiting spring.

[0010] In a preferred embodiment, the insulating substrate is a block structure with vertical symmetry, and the upper and lower ends of the insulating substrate have the same shape.

[0011] In a preferred embodiment, a needle post sealing groove is formed on the outer side of the conductive needle post and between the limiting boss and the limiting slot. A second sealing element is sleeved inside the needle post sealing groove, and the second sealing element and the insulating substrate are interference-fitted. The second sealing element is configured to prevent high-temperature gas from diffusing into the instrument transmission unit along the gap between the insulating substrate and the conductive needle post. Preferably, the second sealing element is an O-ring.

[0012] In a preferred embodiment, the built-in detection sensing unit includes a gas sensor configured to detect the concentration of combustible volatile gases within the oven, wherein the gas sensor is preferably a catalytic combustion gas sensor.

[0013] In a preferred embodiment, the instrument transmitter unit includes an instrument head and a signal processing module. The signal processing module is configured to receive the detection signal from the built-in detection sensor unit and convert it into a concentration value. The instrument head is used to display gas concentration data in real time.

[0014] In a preferred embodiment, the instrument transmitter unit is further provided with an alarm linkage module, which is configured to trigger an alarm signal and link the external ventilation device and the power failure protection device when the detected flammable gas concentration reaches 25% of the lower explosive limit.

[0015] The technical effects achieved by this invention are as follows: This invention uses a Teflon insulating substrate as the insulating carrier for multiple conductive pins. By utilizing the high temperature resistance and stable insulation properties of Teflon, the high-temperature gas inside the oven is isolated, ensuring that there is no crosstalk in the transmission of electrical signals under high-temperature conditions. This achieves a continuous and stable output of the combustible gas concentration detection signal inside the oven. At the same time, the electrical signal transmission between multiple conductive pins remains stable and does not interfere with each other. This enables the long-term stable transmission of the detection signal of the built-in detection sensing unit in a high-temperature and sealed environment and the high reliability of the electronic components inside the instrument transmitter unit, thereby ensuring the real-time monitoring accuracy of the combustible gas concentration inside the oven. This invention uses an insulating substrate with a symmetrical upper and lower structure, combined with a first sealing element and a second sealing element for sealing assembly. Relying on the advantages of Teflon insulating substrate's temperature resistance and non-deformation, it seals the gaps between parts, preventing high-temperature combustible gases from the oven from leaking to the meter head side of the instrument transmission unit. This ensures that the instrument components are not affected by high-temperature exhaust gases and significantly improves the safety of equipment operation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional view of the overall structure of the present invention; Figure 3 This is the present invention. Figure 2 A magnified view of a section at point A in the middle; Figure 4 This is a schematic diagram of the structure of the insulating and sealing assembly of the present invention; Figure 5 This is an exploded view of the structure of the insulating and sealing assembly of the present invention; Figure 6 This is a schematic diagram of the structure of the conductive needle column of the present invention; Figure 7 This is a top view of the structure of the instrument transmitter unit and the first flange pipe of the present invention.

[0017] The attached diagram lists the components represented by each number as follows: 10. Built-in detection and sensing unit; 11. Instrument transmission unit; 20. Flange connection assembly; 21. First flange pipe; 22. Second flange pipe; 30. Insulation and sealing components; 31. Insulating substrate; 32. Conductive needle post; 33. Substrate positioning ring; 34. First sealing element; 35. Limiting boss; 36. Limiting groove; 37. Limiting spring; 38. Needle post sealing groove; 39. Second sealing element. Detailed Implementation

[0018] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0019] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0020] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in a preferred embodiment" appearing in different places throughout this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that mutually excludes other embodiments.

[0021] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include the three-dimensional spatial dimensions of length, width, and depth.

[0022] Please see the appendix Figures 1 to 3 As shown, this is the first embodiment of the present invention. This embodiment provides a novel test probe for use in the detection of gas inside a high-temperature oven. It includes a built-in detection sensing unit 10 located inside the oven and an instrument transmitter unit 11 located outside the oven. The feature is that it also includes a flange docking assembly 20 and an insulation sealing assembly 30. The flange docking assembly 20 includes a first flange tube 21 and a second flange tube 22. The first flange tube 21 is fixed to the upper end of the built-in detection and sensing unit 10. The second flange tube 22 is detachably fixed to the upper end of the first flange tube 21 by screws. The second flange tube 22 is threadedly connected to the instrument transmitter unit 11. The first flange tube 21 is configured to fix the entire probe (i.e., this device) on the oven. The second flange tube 22 is configured to dock the built-in detection and sensing unit 10 with the instrument transmitter unit 11. The insulating sealing assembly 30 is assembled between the first flange pipe 21 and the second flange pipe 22. The insulating sealing assembly 30 is configured to block the leakage of high-temperature gas in the oven to the instrument transmission unit 11, while realizing the electrical signal conduction between the built-in detection sensing unit 10 and the instrument transmission unit 11.

[0023] It should be noted that a high-temperature oven is also used in conjunction with this test probe. The high-temperature oven is equipped with a flange seat, which is compatible with the first flange tube 21. The lower end of the test probe can extend through the inside of the flange seat into the oven. The flange seat and the test probe can be detachably fixedly connected by the cooperation of the first flange tube 21 and screws. Furthermore, a sealing component is provided between the flange seat and the first flange tube 21 to ensure that the inside of the oven is sealed.

[0024] In this embodiment, the built-in detection sensing unit 10 is the core detection unit, which can be directly placed in the high-temperature circulating airflow inside the oven to collect the concentration signal of combustible volatile gases in the oven in real time. The instrument transmitter unit 11 is placed on the outside of the oven body, which can avoid the negative impact of the high temperature environment on the performance and life of electronic components, reduce the probability of failure, and facilitate the operator to directly read the concentration data. The first flange pipe 21 is connected and fixed to the oven body through the flange structure. The insulation sealing component 30 is an integrated sealing and conductive unit, which can form a multi-level sealing structure while conducting electrical signals, to prevent the high-temperature pressurized gas in the oven from leaking along the assembly gap to the external environment where the instrument transmitter unit 11 is located, and to prevent the high-temperature gas from causing the instrument transmitter unit 11 to malfunction. This eliminates the safety hazards caused by the leakage of toxic or combustible gases.

[0025] Secondly, please refer to again Figures 3 to 5 The insulating sealing assembly 30 includes an insulating substrate 31 and multiple conductive pins 32. A substrate positioning ring 33 is provided on the outside of the insulating substrate 31. The insulating substrate 31 is clamped between the first flange pipe 21 and the second flange pipe 22 through the substrate positioning ring 33. The multiple conductive pins 32 are clamped inside the insulating substrate 31 insulated from each other, and the upper and lower ends of the conductive pins 32 penetrate the insulating substrate 31. The lower end of the conductive pins 32 and the built-in detection sensing unit 10 and the upper end of the conductive pins 32 and the instrument transmission unit 11 are electrically connected. The insulating substrate 31 is made of Teflon (i.e., polytetrafluoroethylene, abbreviated as PTFE).

[0026] In this embodiment, Teflon material has excellent high-temperature insulation properties and will not degenerate or fail even when exposed to the high-temperature environment of an oven for a long time. At the same time, it can serve as an insulating carrier for multiple conductive pins 32, avoiding signal crosstalk between adjacent conductive pins 32 and ensuring the stability of electrical signal transmission. The substrate positioning retaining ring 33 is used for overall positioning and locking of the insulating substrate 31, which can ensure that the insulating substrate 31 will not be displaced between the first flange tube 21 and the second flange tube 22, thereby improving structural stability.

[0027] Secondly, please refer to the following as well. Figures 3 to 5 A first sealing element 34 is provided between the insulating substrate 31 and the first flange tube 21, and between the insulating substrate 31 and the conductive needle column 32. The two first sealing elements 34 are located at the upper and lower ends of the substrate positioning ring 33, respectively. The first sealing element 34 and the first flange tube 21, as well as the first sealing element 34 and the second flange tube 22, are all interference fit. The first sealing element 34 is configured to prevent high-temperature gas from diffusing into the instrument transmission unit 11 along the gap between the first flange tube 21 and the insulating substrate 31, and between the second flange tube 22 and the conductive needle column 32. The first sealing element 34 is preferably an O-ring.

[0028] In this embodiment, the two first sealing elements 34 form two seals on the upper and lower sides of the base positioning ring 33, respectively, completely blocking the assembly gap between the insulating base 31 and the first flange tube 21 and the second flange tube 22. With the interference fit assembly method, the device can maintain stable sealing performance under high temperature conditions for a long time and avoid high temperature gas leakage along the gap.

[0029] Secondly, please refer to again Figure 5 and Figure 6 A limiting boss 35 is provided at the lower end of the outer side of the conductive needle post 32, and a limiting slot 36 is provided at the upper end of the outer side of the conductive needle post 32. A limiting spring 37 is detachably engaged inside the limiting slot 36. The conductive needle post 32 and the insulating substrate 31 are connected by the engagement of the limiting boss 35 and the limiting spring 37.

[0030] Furthermore, the insulating substrate 31 is a block structure with symmetrical upper and lower parts. The upper end of the insulating substrate 31 has the same shape as the lower end and is symmetrically arranged with the horizontal plane where the center of gravity of the insulating substrate 31 is located as the symmetrical plane.

[0031] In this embodiment, the symmetrical design eliminates the need to distinguish between the top and bottom directions when assembling the insulating substrate 31, reducing installation difficulty, minimizing the risk of incorrect assembly, and improving assembly efficiency. The conductive pin 32 is secured inside the insulating substrate 31 by the cooperation of the lower limiting boss 35 and the upper limiting snap ring 37, making the connection between the conductive pin 32 and the insulating substrate 31 more stable, preventing axial movement of the conductive pin 32 inside the insulating substrate 31, and ensuring the stability and sealing of the electrical connection.

[0032] Please refer to it again. Figure 3 , Figure 5 and Figure 6 A needle post sealing groove 38 is provided on the outer side of the conductive needle post 32 and between the limiting boss 35 and the limiting slot 36. A second sealing element 39 is sleeved inside the needle post sealing groove 38, and the second sealing element 39 and the insulating substrate 31 are interference fit. The second sealing element 39 is configured to prevent high temperature gas from diffusing into the instrument transmission unit 11 along the gap between the insulating substrate 31 and the conductive needle post 32. The second sealing element 39 is preferably an O-ring.

[0033] In this embodiment, the second sealing element 39 is disposed at the assembly gap between the conductive needle post 32 and the insulating substrate 31, forming an independent sealing structure for the conductive needle post 32, blocking the leakage of high-temperature gas outward along the gap between the conductive needle post 32 and the insulating substrate 31. Together with the sealing structure formed by the aforementioned first sealing element 34, they form a multi-level sealing protection, further improving the overall sealing reliability.

[0034] In a preferred embodiment, the built-in detection sensing unit 10 includes a gas sensor configured to detect the concentration of combustible volatile gases inside the oven. Preferably, the gas sensor is a catalytic combustion gas sensor. The instrument transmitter unit 11 includes an instrument head and a signal processing module. The signal processing module is configured to receive the detection signal from the built-in detection sensing unit 10 and convert it into a concentration value. The instrument head is used to display the gas concentration data in real time. The instrument transmitter unit 11 also has an alarm linkage module configured to trigger an alarm signal and link the external exhaust device and power failure protection device when the detected combustible gas concentration reaches 25% of the lower explosive limit.

[0035] In this embodiment, the catalytic combustion sensor is suitable for detecting low-concentration combustible gases inside the oven, offering fast response and stable measurement accuracy to meet safety detection requirements. The alarm linkage module is directly integrated into the external instrument transmitter unit 11, eliminating the need for an additional external alarm control module, simplifying system wiring. When the combustible gas concentration exceeds the standard, it can quickly trigger safety protection, promptly reducing the gas concentration inside the oven and avoiding the risk of explosion, further enhancing the system's safety performance. During the installation and commissioning phase, operators can directly read the concentration data in real time through the external instrument head without entering the equipment, improving the safety and convenience of installation and maintenance.

[0036] Please see Figure 7 As shown, in a specific embodiment, the flange seat of the oven has multiple holes, and the number of holes on the flange seat is the same as the number of holes on the first flange tube 21. The central angle between two adjacent holes is 90°. The line connecting the centers of two holes located diagonally is denoted as a. The orientation vector line of the meter head on the instrument transmitter unit 11 is denoted as b. The angle between a and b is 45°. In the actual installation process, the installation phase of the first flange tube 21 can be adjusted according to the operating space of the installation position and the observation habits of the operator. By switching different angle offsets of the installation holes, the fixing can be completed, and the orientation of the instrument transmitter unit 11 can be adjusted. No additional secondary processing of the opening of the box is required, and the adaptability is stronger.

[0037] In another specific embodiment, the flange seat of the oven is provided with multiple holes, and the number of holes on the flange seat is at least twice the number of holes on the first flange tube 21, so as to facilitate the adjustment of the probe installation direction, optimize the viewing angle of the machine interface, and facilitate the operator to adjust the orientation of the instrument transmitter unit 11 according to the usage requirements. In one specific embodiment, the flange seat has eight holes, and the central angle between two adjacent holes on the flange seat is 45°. The first flange tube 21 has four holes. With this scheme, the orientation angle of the instrument transmitter unit 11 can be adjusted to any of the following angles according to the usage requirements: 0°, ±45°, ±90°, ±135°, 180°.

[0038] The working principle of this invention is as follows: During installation, first, based on the available installation space and the operator's observation habits, select a suitable installation phase adjustment for the display orientation of the instrument transmitter unit 11. Align the first flange tube 21 with the corresponding offset mounting holes on the oven flange seat, and secure it with screws. Then, sequentially assemble and connect the built-in detection sensor unit 10, the insulation sealing assembly 30, the second flange tube 22, and the instrument transmitter unit 11. During detection, the catalytic combustion gas sensor inside the built-in detection sensor unit 10 is directly placed in the high-temperature environment inside the oven, collecting the concentration signal of combustible volatile gases in real time. The signal is stably transmitted to the signal processing module of the external instrument transmitter unit 11 through multiple mutually insulated conductive pins 32 inside the insulation sealing assembly 30. The signal processing module converts the collected signal into an intuitive concentration value, which is then displayed in real time on the instrument display. When the detected combustible gas concentration reaches the preset threshold... When the value reaches 25% of the lower explosive limit, the alarm linkage module built into the instrument transmitter unit 11 automatically triggers an alarm signal and simultaneously activates the external exhaust device and power failure protection device to quickly reduce the concentration of combustible gas inside the oven, cut off the power supply to the oven, and prevent safety accidents. Throughout the entire operation, the first seals 34 on the upper and lower sides of the insulating substrate 31 and the second seals 39 on the outer side of each conductive pin 32 together form a multi-level sealing structure, which continuously blocks the high-temperature pressurized gas inside the oven from leaking to the external environment where the instrument transmitter unit 11 is located through the assembly gaps of each part. This not only avoids the safety hazards caused by the leakage of toxic or combustible gases, but also prevents the high-temperature gas from affecting the stable operation of the electronic components inside the instrument transmitter unit 11. The Teflon insulating substrate 31 can maintain stable insulation performance under high-temperature conditions for a long time, avoiding signal crosstalk between adjacent conductive pins 32 and ensuring stable and reliable electrical signal transmission.

[0039] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained in this invention are implemented according to conventional methods in the art unless otherwise specified or limited.

Claims

1. A novel test probe for a sealed high-temperature oven, comprising a built-in detection and sensing unit (10) located inside the oven and an instrumentation and transmission unit (11) located outside the oven, characterized in that: It also includes a flange docking assembly (20) and an insulation sealing assembly (30); The flange docking assembly (20) includes a first flange tube (21) and a second flange tube (22). The first flange tube (21) is fixed to the upper end of the built-in detection sensing unit (10). The second flange tube (22) is detachably fixed to the upper end of the first flange tube (21) by screws. The second flange tube (22) and the instrument transmitter unit (11) are threadedly connected. The second flange tube (22) is configured to dock the built-in detection sensing unit (10) and the instrument transmitter unit (11). The insulating sealing assembly (30) is assembled between the first flange pipe (21) and the second flange pipe (22). The insulating sealing assembly (30) is configured to block the leakage of high-temperature gas in the oven to the instrument transmission unit (11) and at the same time realize the electrical signal conduction between the built-in detection sensing unit (10) and the instrument transmission unit (11).

2. The novel test probe for a sealed high-temperature oven according to claim 1, characterized in that: The insulating sealing assembly (30) includes an insulating substrate (31) and a plurality of conductive pins (32). A substrate positioning ring (33) is provided on the outside of the insulating substrate (31). The insulating substrate (31) is clamped between the first flange pipe (21) and the second flange pipe (22) by the substrate positioning ring (33). The plurality of conductive pins (32) are clamped inside the insulating substrate (31) insulated from each other. The upper and lower ends of the conductive pins (32) penetrate the insulating substrate (31). The lower end of the conductive pins (32) and the built-in detection sensing unit (10) and the upper end of the conductive pins (32) and the instrument transmission unit (11) are electrically connected. The insulating substrate (31) is made of Teflon.

3. The novel test probe for a sealed high-temperature oven according to claim 2, characterized in that: A first sealing element (34) is provided between the insulating substrate (31) and the first flange tube (21), as well as between the insulating substrate (31) and the conductive needle column (32). The first sealing element (34) and the first flange tube (21), as well as between the first sealing element (34) and the second flange tube (22), are all interference fits. The first sealing element (34) is configured to block high-temperature gas from diffusing into the instrument transmission unit (11) along the gap between the first flange tube (21) and the insulating substrate (31), as well as between the second flange tube (22) and the conductive needle column (32).

4. The novel test probe for a sealed high-temperature oven according to claim 2, characterized in that: The lower end of the outer side of the conductive needle post (32) is provided with a limiting boss (35), and the upper end of the outer side of the conductive needle post (32) is provided with a limiting slot (36). The limiting slot (36) is detachably connected to a limiting spring (37). The conductive needle post (32) and the insulating substrate (31) are connected by the cooperation of the limiting boss (35) and the limiting spring (37).

5. A novel test probe for a sealed high-temperature oven according to claim 2, characterized in that: The insulating substrate (31) is a block structure with symmetrical upper and lower parts, and the upper and lower ends of the insulating substrate (31) have the same shape.

6. A novel test probe for a sealed high-temperature oven according to claim 2, characterized in that: A needle post sealing groove (38) is provided on the outside of the conductive needle post (32) and between the limiting boss (35) and the limiting slot (36). A second sealing element (39) is sleeved inside the needle post sealing groove (38), and the second sealing element (39) and the insulating substrate (31) are interference fit. The second sealing element (39) is configured to block high temperature gas from diffusing into the instrument transmission unit (11) along the gap between the insulating substrate (31) and the conductive needle post (32).

7. The novel test probe for a sealed high-temperature oven according to claim 1, characterized in that: The built-in detection sensing unit (10) includes a gas sensor configured to detect the concentration of combustible volatile gases inside the oven.

8. The novel test probe for a sealed high-temperature oven according to claim 1, characterized in that: The instrument transmitter unit (11) includes an instrument head and a signal processing module. The signal processing module is configured to receive the detection signal from the built-in detection sensor unit (10) and convert it into a concentration value. The instrument head is used to display gas concentration data in real time.

9. A novel test probe for a sealed high-temperature oven according to claim 8, characterized in that: The instrument transmitter unit (11) is also equipped with an alarm linkage module. The alarm linkage module is configured to trigger an alarm signal and link the external ventilation device and power failure protection device when the detected flammable gas concentration reaches 25% of the lower explosive limit.

Images