Miniature thermal conductivity detector integrated with filtering structure

Abstract

The utility model relates to the technical field of miniature thermal conductivity detectors, and discloses a miniature thermal conductivity detector integrated with a filtering structure, which comprises a working box, sealing ring grooves are formed in the left side and the right side of the top of the working box, and a polytetrafluoroethylene thermal conductivity cell is fixedly connected to the bottom of each sealing ring groove. An airflow cavity is formed in the polytetrafluoroethylene thermal conductivity cell, external air channels are formed in the left side and the right side of the front end of the working box, air outlets are formed in the left side and the right side of the rear end of the working box, a circuit board is arranged on the upper side of the working box, and a plurality of welding columns are fixedly connected to the left side and the right side of the top of the circuit board at equal intervals; and the bottom ends of the plurality of welding columns penetrate through the circuit board and are fixedly connected with corresponding thermistors respectively. According to the thermal conductivity detector, the thermosensitive element is fixed on the circuit board, and the thermal conductivity cell cavity is made of the polytetrafluoroethylene material, so that the miniaturization of the thermal conductivity detector is realized, and meanwhile, the sensitivity of the detector is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of micro thermal conductivity detectors, in particular to a micro thermal conductivity detector with an integrated filtering structure. Background Art

[0002] Due to its fine structure, rapid response, high integration and low power consumption, micro thermal conductivity detectors are widely used in industrial detection, military monitoring, medical diagnosis, fire safety and other fields. They are one of the important components of modern infrared imaging technology.

[0003] Micro thermal conductivity detectors can not only be used for temperature measurement and thermal imaging, but also for gas detection, chemical analysis, and biomedical applications, expanding their applications in scientific research, industry, and medical health.

[0004] Most existing thermistors will deform when the power increases and there is no airflow or insufficient airflow inside the cavity to reduce the temperature, thereby contacting the metal cell body and causing a short circuit, causing the thermal conductivity detector to malfunction. Utility Model Content

[0005] In order to make up for the above shortcomings, the utility model provides a miniature thermal conductivity detector with an integrated filtering structure, which aims to improve the problem in the existing technology that when the power rises and there is no airflow or insufficient airflow inside the cavity to lower the temperature, deformation will occur, thereby contacting the metal pool body and causing a short circuit, resulting in the thermal conductivity detector being unable to work.

[0006] In order to achieve the above-mentioned objectives, the present invention adopts the following technical solutions: a miniature thermal conductivity detector with an integrated filtering structure, comprising a working box, wherein sealing ring grooves are provided on the left and right sides of the top of the working box, a polytetrafluoroethylene thermal conductivity pool is fixedly connected to the bottom of the sealing ring groove, an air flow cavity is provided inside the polytetrafluoroethylene thermal conductivity pool, external air ducts are provided on the left and right sides of the front end of the working box, and air outlets are provided on the left and right sides of the rear end of the working box, a circuit board is provided on the upper side of the working box, a plurality of welding columns are fixedly connected at equal distances on the left and right sides of the top of the circuit board, the bottom ends of the plurality of welding columns pass through the circuit board and are respectively fixedly connected to corresponding thermistors, air pressure sensors are fixedly connected to the left and right sides of the top of the circuit board, the bottom ends of the two air pressure sensors pass through the circuit board, a patch terminal is fixedly connected to the top right side of the circuit board, and a filtering mechanism is provided on the top of the circuit board, which reduces the interference of the external environment on the thermistor.

[0007] As a further description of the above technical solution:

[0008] The filtering mechanism includes a metal box, and the two metal boxes are respectively arranged on the left and right sides of the top of the circuit board. A second groove is opened on the top of the metal box, and a glass cover is fixedly connected to the inside of the second groove. A strip fixing plate is fixedly connected to the bottom outer wall of the metal box, and a sealing strip is fixedly connected to the bottom of the strip fixing plate. A third groove is opened on the left and right sides of the top of the circuit board, and second bolts are rotatably connected at the four corners of the top of the two strip fixing plates. The bottom ends of multiple second bolts pass through the strip fixing plate and are threadedly connected to the circuit board.

[0009] As a further description of the above technical solution:

[0010] The front and rear sides of the top of the circuit board are equidistantly connected with a plurality of first bolts for rotation, the front and rear sides of the top of the working box are equidistantly provided with a plurality of fixing holes, and the plurality of first bolts respectively correspond to the plurality of fixing holes.

[0011] As a further description of the above technical solution:

[0012] A temperature measuring device is fixedly connected to the left side of the working box, a protective cover is provided on the outer side of the temperature measuring device, and a right end of the protective cover is rotatably connected to the left side of the working box.

[0013] As a further description of the above technical solution:

[0014] A first groove is formed on the top of the circuit board, and a handle is rotatably connected to one side of the interior of the first groove.

[0015] As a further description of the above technical solution:

[0016] The top right side of the circuit board is fixedly connected with a patch terminal, and the patch terminal is electrically connected to a plurality of thermistors respectively.

[0017] As a further description of the above technical solution:

[0018] A plurality of U-shaped clamps are fixedly connected to the four corners of the bottom of the working box, and the bottoms of the plurality of U-shaped clamps are rotatably connected to rotating wheels.

[0019] As a further description of the above technical solution:

[0020] The bottoms of the two strip-shaped fixing plates are fixedly connected with sealing strips, and the left and right sides of the top of the circuit board are provided with third grooves, and the sizes of the two third grooves are respectively consistent with the sizes of the corresponding sealing strips.

[0021] The utility model has the following beneficial effects:

[0022] 1. In the present invention, a thermal element is fixed on a circuit board as the upper cover of a micro thermal conductivity cell, and the thermal conductivity cell cavity is made of polytetrafluoroethylene material. By combining the two, the purpose of increasing the resistance of the thermal element and reducing the volume of the thermal conductivity cell cavity is achieved, thereby realizing the miniaturization of the thermal conductivity detector and improving the sensitivity of the detector.

[0023] 2. In the present invention, the filter mechanism is fixed to the circuit board by rotating the second bolt, the sealing strip and the second groove, and the top glass cover is used to achieve transmission or reflection of specific wavelengths, and is used to selectively transmit or block specific wavelengths of light. The metal box forms an electromagnetic shielding structure around the sensor to block external electromagnetic interference. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A three-dimensional diagram of a micro thermal conductivity detector with an integrated filtering structure proposed by the present invention;

[0025] Figure 2 This is a structural breakdown diagram of a micro thermal conductivity detector with an integrated filtering structure proposed in the present invention;

[0026] Figure 3 This is a rear view of the structure of a micro thermal conductivity detector with an integrated filtering structure proposed by the present invention.

[0027] Legend:

[0028] 1. Working box; 2. Filter mechanism; 201. Metal box; 202. Second groove; 203. Glass cover; 204. Bar fixing plate; 205. Sealing strip; 206. Third groove; 207. Second bolt; 3. Sealing ring groove; 4. Polytetrafluoroethylene thermal conductivity cell; 5. Air flow cavity; 6. External air duct; 7. Air outlet; 8. Circuit board; 9. Welding column; 10. Thermistor; 11. Air pressure sensor; 12. SMD terminal; 13. First bolt; 14. Fixing hole; 15. Protective cover; 16. Temperature measuring device; 17. First groove; 18. Handle; 19. U-shaped clamp; 20. Rotating wheel. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] Reference Figure 1 、 Figure 2 and Figure 3, the utility model provides an embodiment: a micro thermal conductivity detector with an integrated filtering structure, comprising a working box 1, a sealing ring groove 3 is opened on the left and right sides of the top of the working box 1, a polytetrafluoroethylene thermal conductivity pool 4 is fixedly connected to the bottom of the sealing ring groove 3, an air flow cavity 5 is opened inside the polytetrafluoroethylene thermal conductivity pool 4, an external air duct 6 is opened on the left and right sides of the front end of the working box 1, an air outlet 7 is opened on the left and right sides of the rear end of the working box 1, a circuit board 8 is provided on the upper side of the working box 1, a plurality of welding columns 9 are fixedly connected to the left and right sides of the top of the circuit board 8 at equal distances, the bottom ends of the plurality of welding columns 9 all penetrate the circuit board 8 and are respectively fixedly connected to corresponding thermistors 10, an air pressure sensor 11 is fixedly connected to the left and right sides of the top of the circuit board 8, the bottom ends of the two air pressure sensors 11 all penetrate the circuit board 8, a patch terminal 12 is fixedly connected to the right side of the top of the circuit board 8, a filtering mechanism 2 is provided on the top of the circuit board 8, and the filtering mechanism 2 reduces the interference of the external environment on the thermistor 10;

[0031] Specifically, the circuit board 8 is placed on the top of the working box 1. At this time, the first bolt 13 is rotated to limit the circuit board 8, so that the thermistor 10 and the air pressure sensor 11 at the bottom of the circuit board 8 are embedded in the polytetrafluoroethylene thermal conductivity cell 4. At this time, gas enters from the external air duct 6, causing the air pressure sensor 11 to detect the airflow. At the same time, the surface mount terminal 12 works to make the thermistor 10 heat up and work. The welding column 9 is U-shaped. Compared with the traditional method of installing the thermistor 10 in one direction in the thermal conductivity cell, this method lengthens the thermistor 10, thereby increasing the resistance value of the thermistor 10 and reducing the volume of the cavity in the thermal conductivity cell, realizing the miniaturization of the thermal conductivity detector and improving the sensitivity of the detector.

[0032] Reference Figure 2 and Figure 3 The filtering mechanism 2 includes a metal box 201, two metal boxes 201 are respectively arranged on the left and right sides of the top of the circuit board 8, a second groove 202 is opened on the top of the metal box 201, a glass cover 203 is fixedly connected to the inside of the second groove 202, a strip fixing plate 204 is fixedly connected to the bottom outer wall of the metal box 201, a sealing strip 205 is fixedly connected to the bottom of the strip fixing plate 204, and a third groove 206 is opened on the left and right sides of the top of the circuit board 8. The four corners of the top of the two strip fixing plates 204 are rotatably connected with second bolts 207, and the bottom ends of the multiple second bolts 207 all penetrate the strip fixing plate 204 and are threadedly connected to the circuit board 8;

[0033] Specifically, the filtering mechanism 2 is at the top of the circuit board 8, and the sealing strip 205 is aligned with the second groove 202 and inserted. At this time, the second bolt 207 is rotated to fix the strip fixing plate 204 on the circuit board 8. The top glass cover 203 is used to achieve the transmission or reflection of specific wavelengths, which is used to selectively transmit or block specific wavelengths of light. The metal box 201 is used to form an electromagnetic shielding structure around the sensor to block external electromagnetic interference, making the detection data more accurate and convenient for users to use.

[0034] Reference Figure 1 and Figure 2 The front and rear sides of the top of the circuit board 8 are equidistantly connected to a plurality of first bolts 13 for rotation. The front and rear sides of the top of the work box 1 are equidistantly opened with a plurality of fixing holes 14. The plurality of first bolts 13 correspond to the plurality of fixing holes 14 respectively. A temperature measuring device 16 is fixedly connected to the left side of the work box 1. A protective cover 15 is provided on the outside of the temperature measuring device 16. One end of the right side of the protective cover 15 is rotatably connected to the left side of the work box 1. A first groove 17 is opened on the top of the circuit board 8. A handle 18 is rotatably connected to one side of the inner side of the first groove 17.

[0035] Specifically, the first bolt 13 and the fixing hole 14 can fix the circuit board 8 more stably, the temperature measurer 16 can observe the temperature inside the working box 1, the protective cover 15 can protect the temperature measurer 16 from being damaged by bumps, and the handle 18 makes it convenient for the user to lift the circuit board 8.

[0036] Reference Figure 1 and Figure 2 , the top right side of the circuit board 8 is fixedly connected to a patch terminal 12, and the patch terminal 12 is electrically connected to a plurality of thermistors 10 respectively. A plurality of U-shaped clamps 19 are fixedly connected to the four corners of the bottom of the working box 1. The bottoms of the plurality of U-shaped clamps 19 are rotatably connected to a rotating wheel 20. The bottoms of the two strip-shaped fixed plates 204 are fixedly connected to a sealing strip 205. The left and right sides of the top of the circuit board 8 are provided with a third groove 206. The sizes of the two third grooves 206 are respectively consistent with the sizes of the corresponding sealing strips 205.

[0037] Specifically, the patch terminal 12 can control whether the thermistor 10 is working or not, the U-shaped clamping plate 19 and the rotating wheel 20 can facilitate the movement of the working box 1, and the sealing strip 205 and the third groove 206 have the same size to better seal.

[0038] Working Principle: When using the micro thermal conductivity detector, you must first cover the circuit board 8 on the top of the working box 1. At this time, turn the multiple first bolts 13 to limit the circuit board 8, so that the thermistor 10 and the air pressure sensor 11 at the bottom of the circuit board 8 are embedded in the polytetrafluoroethylene thermal conductivity cell 4. At this time, air enters from the external air duct 6, causing the air pressure sensor 11 to detect airflow, and at the same time, the patch terminal 12 operates to make the thermistor 10 heat up;

[0039] When in use, the filter mechanism 2 is placed on top of the circuit board 8 , the sealing strip 205 is aligned with the second groove 202 and inserted, and the second bolt 207 is rotated to fix the strip fixing plate 204 on the top of the circuit board 8 .

[0040] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A micro thermal conductivity detector with an integrated filtering structure, comprising a working box (1), characterized in that: The top and left sides of the working box (1) are both provided with sealing ring grooves (3), the bottom of the sealing ring groove (3) is fixedly connected to a polytetrafluoroethylene heat conduction pool (4), an air flow cavity (5) is provided inside the polytetrafluoroethylene heat conduction pool (4), the front and left sides of the working box (1) are both provided with external air ducts (6), the rear and left sides of the working box (1) are both provided with air outlets (7), a circuit board (8) is provided on the upper side of the working box (1), and a plurality of welding columns are fixedly connected to the left and right sides of the top of the circuit board (8) at equal distances. (9), the bottom ends of the plurality of welding columns (9) all pass through the circuit board (8) and are fixedly connected to corresponding thermistors (10), the left and right sides of the top of the circuit board (8) are fixedly connected to air pressure sensors (11), the bottom ends of the two air pressure sensors (11) all pass through the circuit board (8), the right side of the top of the circuit board (8) is fixedly connected to a patch terminal (12), and a filtering mechanism (2) is provided on the top of the circuit board (8), and the filtering mechanism (2) reduces the interference of the external environment on the thermistor (10).

2. The micro thermal conductivity detector with an integrated filtering structure according to claim 1, characterized in that: The filtering mechanism (2) comprises a metal box (201), two metal boxes (201) are respectively arranged on the left and right sides of the top of the circuit board (8), a second groove (202) is provided on the top of the metal box (201), a glass cover (203) is fixedly connected inside the second groove (202), a strip-shaped fixing plate (204) is fixedly connected to the outer wall of the bottom of the metal box (201), a sealing strip (205) is fixedly connected to the bottom of the strip-shaped fixing plate (204), a third groove (206) is provided on the left and right sides of the top of the circuit board (8), and second bolts (207) are rotatably connected at the four corners of the top of the two strip-shaped fixing plates (204), and the bottom ends of the plurality of second bolts (207) all pass through the strip-shaped fixing plate (204) and are threadedly connected to the circuit board (8).

3. The micro thermal conductivity detector with an integrated filtering structure according to claim 1, characterized in that: The front and rear sides of the top of the circuit board (8) are equidistantly connected to a plurality of first bolts (13), and the front and rear sides of the top of the working box (1) are equidistantly provided with a plurality of fixing holes (14), and the plurality of first bolts (13) respectively correspond to the plurality of fixing holes (14).

4. The micro thermal conductivity detector with an integrated filtering structure according to claim 1, characterized in that: A temperature measuring device (16) is fixedly connected to the left side of the working box (1), a protective cover (15) is provided on the outside of the temperature measuring device (16), and a right end of the protective cover (15) is rotatably connected to the left side of the working box (1).

5. The micro thermal conductivity detector with integrated filtering structure according to claim 1, characterized in that: A first groove (17) is provided on the top of the circuit board (8), and a handle (18) is rotatably connected to one side of the interior of the first groove (17).

6. The micro thermal conductivity detector with integrated filtering structure according to claim 1, characterized in that: A patch terminal (12) is fixedly connected to the right side of the top of the circuit board (8), and the patch terminal (12) is electrically connected to a plurality of thermistors (10) respectively.

7. The micro thermal conductivity detector with an integrated filtering structure according to claim 1, characterized in that: A plurality of U-shaped clamping plates (19) are fixedly connected to the four corners of the bottom of the working box (1), and a rotating wheel (20) is rotatably connected to the bottoms of the plurality of U-shaped clamping plates (19).

8. The micro thermal conductivity detector with integrated filtering structure according to claim 2, characterized in that: The bottoms of the two strip-shaped fixing plates (204) are fixedly connected with sealing strips (205), and the left and right sides of the top of the circuit board (8) are both provided with third grooves (206), and the sizes of the two third grooves (206) are respectively consistent with the sizes of the corresponding sealing strips (205).

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