An electric leakage-proof heating probe

Abstract

The utility model relates to the technical field of smoke measurement discloses a kind of anti-creeping heating probe rod, including air pipe, heating rod and rod temperature sensor, by separately independent pasting heating rod and rod temperature sensor in air pipe outside, along air pipe axial arrangement, and mutually away, realize the physical isolation of heating function and temperature monitoring function from structure;Heating rod is arranged closely to air pipe, and the efficient heating of sample gas channel is carried out;Rod temperature sensor is pasted to air pipe surface, can accurately induct air pipe real-time temperature, heating rod and sensor keep good heat conduction contact between air pipe, to realize more stable temperature control process, and the other in structure is separated, avoid electrical interference, in addition, air pipe outside is equipped with metal shell, metal shell and heating rod, rod temperature sensor between setting have insulating block, further eliminate electrical interference, avoid the problem that heating rod appears overload heating or false triggering due to signal anomaly.

Description

Technical Field

[0001] This utility model relates to the field of smoke and dust measurement technology, and more specifically, to a leakage-proof heating probe. Background Technology

[0002] Dust measurement technology plays a crucial role in air pollution monitoring, especially in areas such as industrial emissions, combustion processes, and environmental monitoring. As an important detection device, the core task of a low-concentration dust meter is to accurately collect the dust content in gases and ensure that the sample gas temperature is maintained within a certain standard range. This has a decisive impact on ensuring the accuracy and stability of the measurement data. Therefore, the heating system, as a key component of a low-concentration dust meter, typically needs to heat the sample gas entering the analysis device to prevent excessive temperature fluctuations due to pipeline or environmental factors, which could affect the accuracy of dust content measurement.

[0003] Currently, most existing heating probes integrate a spiral heating wire and a temperature sensor into one unit, using a temperature control element to monitor the gas pipe temperature and control the power supply to the heating element. However, the integration of the heating wire and temperature sensor creates a possibility of current conduction between them, potentially leading to leakage and affecting the stability of the temperature control system. Furthermore, electrical interference between the heating element and the temperature sensor can cause significant temperature signal fluctuations, which can result in insufficient temperature control accuracy and compromise the reliability of smoke and dust measurements.

[0004] Therefore, there is a need to provide a leakage-proof heating probe to solve the problem of poor temperature control stability of existing heating probes. Utility Model Content

[0005] The main objective of this invention is to provide a leakage-proof heating probe, which aims to solve the technical problems mentioned in the background section.

[0006] The present invention adopts the following technical solution:

[0007] A leakage-proof heating probe includes an air tube, a heating rod, and a rod-shaped temperature sensor. Along the axial direction of the air tube, the heating rod and the rod-shaped temperature sensor are both attached to the outside of the air tube, and the heating rod and the rod-shaped temperature sensor are far apart from each other.

[0008] The outer side of the trachea is fitted with a metal shell, and an insulating block is provided between the metal shell and the heating rod and the rod-shaped temperature sensor to prevent the heating rod and the rod-shaped temperature sensor from being electrically connected through the metal shell.

[0009] Furthermore, the metal shell is provided with a front end cap and a rear end cap at opposite ends, and both the front end cap and the rear end cap are provided with through holes. The through holes are connected to the air tube and are sleeved on the outside of the air tube.

[0010] Furthermore, mounting grooves are provided on the inner sides of both opposite ends of the metal casing. The diameter of the mounting grooves is larger than the inner diameter of the metal casing. The front end cap and the rear end cap are connected to the mounting grooves on their respective sides that are close to each other.

[0011] Furthermore, the front end cap includes a first cover portion and a first extension portion, the diameter of the first cover portion is equal to the diameter of the metal shell, and the side of the first cover portion facing the first extension portion is connected to the end of the metal shell;

[0012] The outer side of the first extension is interference-fitted with the mounting groove, and the inner side of the first extension is sleeved on the outer side of the air tube.

[0013] Furthermore, the rear end cap includes a second cover portion and a second extension portion, the diameter of the second cover portion being equal to the diameter of the metal shell, and the side of the second cover portion facing the second extension portion being connected to the end of the metal shell;

[0014] The outer side of the second extension is interference-fitted with the mounting groove, and the inner side of the second extension is sleeved on the outer side of the air pipe. The side of the second extension facing the rear end cap abuts against the insulating block.

[0015] Furthermore, the heating rod and the rod-shaped temperature sensor are respectively connected to a first wire and a second wire on the side facing the rear end cap. The rear end cap has a first wire hole and a second wire hole along the axial direction of the gas tube, and the first wire and the second wire pass through the first wire hole and the second wire hole respectively.

[0016] Furthermore, a sealing groove is provided on the inner side of the first extension, and a sealing ring is provided in the sealing groove, which abuts against the air pipe and the front end cap respectively.

[0017] Furthermore, a plurality of fastening sleeves are fitted on the outer side of the heating rod and the rod-shaped temperature sensor. Along the axial direction of the air pipe, the plurality of fastening sleeves are equidistantly distributed to fix the heating rod and the rod-shaped temperature sensor on the outer side of the air pipe.

[0018] Furthermore, the rod-shaped temperature sensor is a Pt100 resistance temperature detector (RTD).

[0019] Beneficial effects:

[0020] This invention provides a leakage-proof heating probe. By independently attaching the heating rod and rod-shaped temperature sensor to the outside of the trachea, arranged along the trachea's axial direction and kept far apart, the heating and temperature monitoring functions are physically isolated structurally. The heating rod is positioned close to the trachea for efficient heating of the sample gas channel. The rod-shaped temperature sensor, also attached to the trachea surface, accurately senses the real-time temperature of the trachea and continuously feeds back to the system to control the heating state. The heating rod and sensor maintain good thermal contact with the trachea, resulting in a more stable temperature control process. Furthermore, their structural separation avoids electrical interference. In addition, a metal outer shell is fitted over the trachea, with an insulating block between the metal shell and the heating rod and rod-shaped temperature sensor, ensuring safe isolation between the functional components and the conductive shell. This eliminates the risk of leakage at the source, further reduces electrical interference, stabilizes temperature signal acquisition, and prevents the heating rod from overloading or falsely triggering due to abnormal signals. This significantly improves the overall temperature control accuracy and long-term operational reliability of the probe. Attached Figure Description

[0021] Figure 1 This is a cross-sectional schematic diagram of the overall structure of a leakage-proof heating probe according to this utility model;

[0022] Figure 2 This is a partial structural schematic diagram of the front end cap of this utility model;

[0023] Figure 3 This is a partial structural schematic diagram of the rear end cap of this utility model;

[0024] in:

[0025] 100. Air tube; 200. Heating rod; 300. Rod-shaped temperature sensor; 400. Metal housing; 401. Mounting groove; 500. Insulating block; 600. Front end cap; 601. First cover part; 602. First extension part; 603. Sealing groove; 700. Rear end cap; 701. Second cover part; 702. Second extension part; 703. First wire hole; 704. Second wire hole; 8. First wire; 9. Second wire; 10. Sealing ring; 11. Fastening clip.

[0026] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0027] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0028] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do 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 a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0031] Reference Figures 1 to 3 This utility model proposes a leakage-proof heating probe, including an air tube 100, a heating rod 200 and a rod-shaped temperature sensor 300. Along the axial direction of the air tube 100, the heating rod 200 and the rod-shaped temperature sensor 300 are both attached to the outside of the air tube 100, and the heating rod 200 and the rod-shaped temperature sensor 300 are far apart from each other.

[0032] The outer side of the trachea 100 is fitted with a metal shell 400. An insulating block 500 is provided between the metal shell 400 and the heating rod 200 and the rod-shaped temperature sensor 300 to prevent the heating rod 200 and the rod-shaped temperature sensor 300 from being electrically connected through the metal shell 400.

[0033] In the above embodiment, the leakage-proof heating probe achieves effective physical isolation between the heating function and the temperature monitoring function by independently arranging the heating rod 200 and the rod-shaped temperature sensor 300 along the axial direction of the gas tube 100 and keeping them far apart from each other. The heating rod 200 is directly attached to the outside of the gas tube 100 and tightly wraps around the surface of the gas tube 100 to ensure efficient heat conduction and continuous heating of the sample gas inside the gas tube 100. The rod-shaped temperature sensor 300 is also attached to the outside of the gas tube 100, accurately sensing the surface temperature of the gas tube 100 and feeding back the real-time temperature signal to the main control system, which controls the working state of the heating rod 200 through a solid-state relay. The independent arrangement of the temperature sensor and the heating rod 200 on the outside of the gas tube 100 ensures that they do not interfere with each other during operation, avoiding electrical interference between the heating and monitoring processes, thereby improving the stability of the temperature control process and the response speed of the system.

[0034] To further enhance safety and stability, a metal outer shell 400 is fitted around the outside of the air tube 100. A high-temperature resistant insulating block 500 is placed between the metal outer shell 400 and the heating rod 200 and the temperature sensor to ensure that there is no electrical contact between the heating rod 200 and the temperature sensor and the metal outer shell 400. This effectively prevents the risk of leakage while achieving protective performance, and also avoids temperature signal fluctuations caused by electrical interference, ensuring the accuracy of the temperature control system. It further avoids problems such as overload heating or incorrect triggering of control signals caused by current misdirection, and stabilizes the heating process.

[0035] In one embodiment, the metal casing 400 is provided with a front end cap 600 and a rear end cap 700 at opposite ends, and both the front end cap 600 and the rear end cap 700 are provided with through holes. The through holes communicate with the air tube 100 and are sleeved on the outside of the air tube 100.

[0036] In the above embodiment, the metal outer shell 400 of the anti-leakage heating probe is provided with a front end cap 600 and a rear end cap 700 at opposite ends, both of which are provided with through holes. The through holes are connected to the gas pipe 100 and are fitted onto the outside of the gas pipe 100, ensuring that the heating probe can smoothly pass through the gas pipe 100 while maintaining electrical isolation between the gas pipe 100 and the outer shell. The through holes not only maintain stable airflow within the gas pipe 100 but also reduce electrical interference or leakage problems that may be caused by direct contact between the metal outer shell 400 and the gas pipe 100, thereby improving the safety and stability of the heating probe. The connection between the through holes and the gas pipe 100 ensures that the airflow is not disturbed by the outer shell, maintaining accurate sample gas temperature control throughout the heating process.

[0037] refer to Figure 2 and Figure 3 In one example, the inner sides of the metal casing 400 at both ends are provided with mounting grooves 401, the diameter of the mounting grooves 401 is larger than the inner diameter of the metal casing 400, and the front end cap 600 and the rear end cap 700 are connected to the mounting grooves 401 on the side that is close to each other.

[0038] In the above embodiment, mounting grooves 401 are provided on the inner sides of both opposite ends of the metal casing 400, and the diameter of the mounting grooves 401 is larger than the inner diameter of the metal casing 400. The adjacent sides of the front end cap 600 and the rear end cap 700 are connected to the mounting grooves 401, which further enhances the structural stability of the heating probe by ensuring a tight fit between the end caps and the inner wall of the casing. The mounting grooves 401 not only enhance the connection strength between the end caps and the casing, but also ensure that the installation position of the end caps is firm and not easy to loosen through interference fit. In addition, the mounting grooves 401 also play a role in auxiliary positioning and structural support, so that the components of the heating probe can be stably fixed on the outside of the gas pipe 100, avoiding displacement caused by vibration or external forces during operation.

[0039] refer to Figure 2 In one embodiment, the front end cap 600 includes a first cover portion 601 and a first extension portion 602. The diameter of the first cover portion 601 is equal to the diameter of the metal shell 400. The side of the first cover portion 601 facing the first extension portion 602 is connected to the end of the metal shell 400.

[0040] The outer side of the first extension 602 is press-fitted with the mounting groove 401, and the inner side of the first extension 602 is sleeved on the outer side of the air pipe 100.

[0041] In the above embodiment, the front end cap 600 includes a first cover portion 601 and a first extension portion 602. The diameter of the first cover portion 601 is equal to the diameter of the metal shell 400, and the side facing the first extension portion 602 is connected to the end of the metal shell 400. The first extension portion 602 extends from one side of the first cover portion 601 toward the metal shell 400. The outer side of the first extension portion 602 is press-fitted with the mounting groove 401, and its inner side is fitted over the outer side of the gas pipe 100. The press-fit ensures a secure connection between the front end cap 600 and the gas pipe 100 and prevents gas leakage, further improving the sealing performance. The press-fit of the first extension portion 602 ensures the tight installation of the end cap, while the connection method of the first cover portion 601 ensures the mechanical strength of the entire structure and prevents the connection from loosening due to external pressure. In addition, the inner side of the first extension portion 602 fitted over the outer side of the gas pipe 100 can effectively isolate the heating element from the external environment, further reducing the risk of leakage and temperature instability, and ensuring the accuracy and stability of the temperature control system.

[0042] refer to Figure 3 In one embodiment, the rear end cap 700 includes a second cover portion 701 and a second extension portion 702. The diameter of the second cover portion 701 is equal to the diameter of the metal housing 400, and the side of the second cover portion 701 facing the second extension portion 702 is connected to the end of the metal housing 400.

[0043] The outer side of the second extension 702 is press-fitted with the mounting groove 401, and the inner side of the second extension 702 is sleeved on the outer side of the air pipe 100. The side of the second extension 702 facing the rear end cap 700 abuts against the insulating block 500.

[0044] In the above embodiment, the rear end cap 700 includes a second cover portion 701 and a second extension portion 702. The diameter of the second cover portion 701 is the same as the diameter of the metal housing 400, and the side facing the second extension portion 702 is connected to the end of the metal housing 400. The second extension portion 702 extends from one side of the second cover portion 701 toward the metal housing 400. The outer side of the second extension portion 702 is press-fitted with the mounting groove 401, and its inner side is sleeved on the outside of the gas pipe 100. The structure of the second cover portion 701 and the second extension portion 702 in the rear end cap 700 is similar to that of the front end cap 600. The press-fit enhances the connection stability between the rear end cap 700 and the gas pipe 100, further improving the overall sealing performance and preventing gas leakage. In particular, the side of the second extension portion 702 facing the rear end cap 700 abuts against the insulating block 500, ensuring electrical isolation between the heating element and the metal housing 400 and avoiding the possibility of leakage.

[0045] In one embodiment, the heating rod 200 and the rod-shaped temperature sensor 300 are respectively connected to a first wire 8 and a second wire 9 on the side facing the rear end cap 700. The rear end cap 700 has a first wire hole 703 and a second wire hole 704 along the axial direction of the air pipe 100. The first wire 8 and the second wire 9 pass through the first wire hole 703 and the second wire hole 704 respectively.

[0046] In the above embodiment, the heating rod 200 and the rod-shaped temperature sensor 300 are respectively connected to a first wire 8 and a second wire 9 on the side facing the rear end cap 700. The rear end cap 700 has a first wire hole 703 and a second wire hole 704 along the axial direction of the air pipe 100. The first wire hole 703 and the second wire hole 704 are respectively aligned with the heating rod 200 and the rod-shaped temperature sensor 300, and the first wire 8 and the second wire 9 pass through these two wire holes respectively. This ensures a stable electrical connection and guarantees the safe guidance and protection of the cable, preventing the wires from being directly exposed to the external environment, reducing the risk of leakage. At the same time, the wire holes ensure that the wires pass smoothly, effectively reducing electrical faults or line damage caused by excessive bending or wear.

[0047] In one embodiment, a sealing groove 603 is provided on the inner side of the first extension 602, and a sealing ring 10 is provided in the sealing groove 603. The sealing ring 10 abuts against the air pipe 100 and the front end cap 600 respectively.

[0048] In the above embodiment, a sealing groove 603 is provided on the inner side of the first extension 602. The sealing groove 603 is annular, and a sealing ring 10 is provided in the sealing groove 603. The sealing ring 10 abuts against the gas pipe 100 and the front end cap 600 respectively. The sealing ring 10 is an O-ring, and the cross-sectional diameter needs to be greater than the opening depth of the sealing groove 603 to seal between the heating probe and the gas pipe 100, avoid gas leakage during heating, and effectively prevent external moisture or dust from entering the equipment. This ensures the stability and safety of the heating probe during long-term use, maintains the stable working environment of the heating element and temperature sensor, and improves the accuracy and reliability of the temperature control system.

[0049] In one embodiment, a plurality of fastening sleeves 11 are provided on the outer side of the heating rod 200 and the rod-shaped temperature sensor 300. The plurality of fastening sleeves 11 are equidistantly distributed along the axial direction of the air pipe 100 to fix the heating rod 200 and the rod-shaped temperature sensor 300 on the outer side of the air pipe 100.

[0050] In the above embodiment, a plurality of fastening sleeves 11 are sleeved on the outer side of the heating rod 200 and the rod-shaped temperature sensor 300. Along the axial direction of the air pipe 100, the plurality of fastening sleeves 11 are equidistantly distributed to fix the heating rod 200 and the rod-shaped temperature sensor 300 on the outer side of the air pipe 100. In this embodiment, the fastening sleeves 11 are preferably set to 3. The heating rod 200 and the temperature sensor are firmly fixed on the outer side of the air pipe 100 by the plurality of fastening sleeves 11, which ensures the stability of the position of the heating element and the temperature sensor during use and avoids displacement caused by external force or vibration.

[0051] In one embodiment, the rod-shaped temperature sensor 300 is a Pt100 resistance temperature detector (RTD).

[0052] In the above embodiment, the rod-shaped temperature sensor 300 uses a Pt100 resistance thermometer. Pt100 resistance thermometers offer advantages such as high accuracy and high stability, providing accurate temperature measurements over a wide temperature range. Based on the temperature coefficient of platinum resistance thermometers, the resistance of the platinum resistance increases with temperature, and the temperature value can be obtained by measuring the change in resistance. Using a Pt100 resistance thermometer as the rod-shaped temperature sensor 300 not only improves the accuracy of temperature measurement but also enhances the stability and reliability of the system, enabling the heating probe to maintain precise temperature control during heating. Furthermore, the Pt100 resistance thermometer has good corrosion resistance and wear resistance, allowing for long-term use in harsh working environments and extending the service life of the heating probe.

[0053] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural or procedural transformations made based on the content of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A leakage-proof heating probe, characterized in that, It includes a trachea (100), a heating rod (200) and a rod-shaped temperature sensor (300). Along the axial direction of the trachea (100), the heating rod (200) and the rod-shaped temperature sensor (300) are both attached to the outside of the trachea (100) and are far apart from each other. The outer side of the trachea (100) is fitted with a metal shell (400), and an insulating block (500) is provided between the metal shell (400) and the heating rod (200) and the rod-shaped temperature sensor (300) to prevent the heating rod (200) and the rod-shaped temperature sensor (300) from being electrically connected through the metal shell (400).

2. The anti-leakage heating probe according to claim 1, characterized in that, The metal casing (400) has a front end cap (600) and a rear end cap (700) at opposite ends. Both the front end cap (600) and the rear end cap (700) have through holes. The through holes are connected to the air tube (100) and are sleeved on the outside of the air tube (100).

3. The anti-leakage heating probe according to claim 2, characterized in that, The metal casing (400) has mounting grooves (401) on the inner sides of both ends. The diameter of the mounting grooves (401) is larger than the inner diameter of the metal casing (400). The front end cap (600) and the rear end cap (700) are connected to the mounting grooves (401) on the side that is close to each other.

4. The anti-leakage heating probe according to claim 3, characterized in that, The front end cap (600) includes a first cover portion (601) and a first extension portion (602). The diameter of the first cover portion (601) is equal to the diameter of the metal shell (400). The side of the first cover portion (601) facing the first extension portion (602) is connected to the end of the metal shell (400). The outer side of the first extension (602) is press-fitted with the mounting groove (401), and the inner side of the first extension (602) is sleeved on the outer side of the air pipe (100).

5. The anti-leakage heating probe according to claim 3, characterized in that, The rear end cap (700) includes a second cover portion (701) and a second extension portion (702). The diameter of the second cover portion (701) is equal to the diameter of the metal shell (400). The side of the second cover portion (701) facing the second extension portion (702) is connected to the end of the metal shell (400). The outer side of the second extension (702) is press-fitted with the mounting groove (401), and the inner side of the second extension (702) is sleeved on the outer side of the air pipe (100). The side of the second extension (702) facing the rear end cap (700) abuts against the insulating block (500).

6. The anti-leakage heating probe according to claim 2, characterized in that, The heating rod (200) and the rod-shaped temperature sensor (300) are respectively connected to a first wire (8) and a second wire (9) on the side facing the rear end cap (700). The rear end cap (700) has a first wire hole (703) and a second wire hole (704) along the axial direction of the air pipe (100). The first wire (8) and the second wire (9) pass through the first wire hole (703) and the second wire hole (704) respectively.

7. The anti-leakage heating probe according to claim 4, characterized in that, A sealing groove (603) is provided on the inner side of the first extension (602), and a sealing ring (10) is provided in the sealing groove (603). The sealing ring (10) abuts against the air pipe (100) and the front end cap (600) respectively.

8. The anti-leakage heating probe according to claim 1, characterized in that, The heating rod (200) and the rod-shaped temperature sensor (300) are fitted with a plurality of fastening sleeves (11) on their outer sides. Along the axial direction of the air pipe (100), the plurality of fastening sleeves (11) are equidistantly distributed to fix the heating rod (200) and the rod-shaped temperature sensor (300) on the outer side of the air pipe (100).

9. A leakage-proof heating probe according to claim 1, characterized in that, The rod-shaped temperature sensor (300) is a Pt100 resistance temperature detector.

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