Thermal conductive hydrogen transmitter

Abstract

The utility model provides a thermal conductive hydrogen transmitter, which belongs to the technical field of gas sensing detection and comprises a base and a shell fixedly arranged on the base, and a sealed gas chamber is arranged in the shell. The end parts of an air inlet nozzle and an air outlet nozzle arranged on the two sides of the shell respectively extend into the sealed air chamber and are communicated with the sealed air chamber; a hydrogen detection sensor used for detecting the concentration of hydrogen contained in gas entering the sealed gas chamber through the gas inlet nozzle is arranged in the sealed gas chamber, a temperature sensor used for detecting the detection temperature is arranged in the shell, and the hydrogen detection sensor and the temperature sensor are electrically connected with a PCB arranged on the top of the shell. And the complexity of field calibration and maintenance of the thermal conductivity hydrogen transmitter is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas sensing detection, and specifically relates to a thermal conductivity hydrogen transmitter. Background Art

[0002] The thermal conductivity hydrogen transmitter mainly detects hydrogen with different thermal conductivities. When the hydrogen to be detected flows through the sensor, the interaction between gas molecules will cause the temperature of the thermistor inside the sensor to change, which in turn affects its own resistance value. This slight change in resistance value can be converted into a voltage signal through the circuit, thereby realizing the detection, monitoring, analysis and alarm of gas concentration.

[0003] At present, most hydrogen analyzers in the industrial field mainly use sensors that work on the principle of thermal conductivity. The sensors are nonlinear sensors, and the sensors and instrument circuit boards are mostly integrated designs. Many companies still use multi-point calibration to deal with the nonlinearity of sensors, which will complicate customer on-site calibration; a few companies also use curve fitting to deal with it. If the sensor is damaged, it will face the non-interchangeability of the integrated design. In order to improve the measurement accuracy, one sensor corresponds to a unique curve fitting coefficient. Replacing the sensor requires re-fitting the coefficient, which will inevitably complicate product maintenance. Utility Model Content

[0004] In order to solve the complexity of on-site calibration and maintenance of a thermal conductivity hydrogen transmitter, the utility model provides a thermal conductivity hydrogen transmitter.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A thermal conductivity hydrogen transmitter,

[0007] It comprises a base and a shell fixed on the base, wherein a sealed air chamber is provided in the shell;

[0008] The ends of the air inlet nozzle and the air outlet nozzle provided on both sides of the shell extend into the sealed air chamber and communicate with the sealed air chamber respectively;

[0009] The sealed air chamber is provided with a hydrogen detection sensor for detecting the hydrogen concentration contained in the gas entering the sealed air chamber through the air inlet nozzle, and the shell is provided with a temperature sensor for detecting the temperature. The hydrogen detection sensor and the temperature sensor are respectively electrically connected to a PCB board provided on the top of the shell.

[0010] Preferably, a hollow body fixedly connected to the base is fixedly provided in the shell, a sealing device is fixedly connected to the upper part of the hollow body, and the space formed by the hollow body between the sealing device and the base is a sealed air chamber.

[0011] Preferably, the sealing device comprises a sealing plate disposed in the hollow body, the sealing plate is fixedly connected to the hollow body via a pressing block disposed on the hollow body, the hydrogen detection sensor is disposed below the sealing plate, and the temperature sensor is disposed above the sealing plate.

[0012] Preferably, the hollow body is covered with thermal insulation cotton, and a heating paste is provided between the thermal insulation cotton and the hollow body.

[0013] Preferably, the PCB board includes a first PCB board arranged below the sealing board, a second PCB board and a third PCB board arranged on the upper part of the shell, the third PCB board is located below the second PCB board, the hydrogen detection sensor is arranged on the first PCB board, the temperature sensor is electrically connected to the second PCB board, and the first PCB board and the second PCB board are electrically connected to the third PCB board respectively.

[0014] Preferably, a partition plate is fixedly provided in the shell, the partition plate is located below the second PCB board, and the partition plate is fixedly connected to the inner wall of the shell or is an integral structure.

[0015] Preferably, a circular step is provided in the hollow body, the sealing plate is overlapped on the circular step, and a circular sealing ring is provided between the sealing plate and the circular step.

[0016] The thermal conductive hydrogen transmitter provided by the utility model has the following beneficial effects: the hydrogen sensor and related devices that can only be installed together with other devices are separated. The integrated design of the utility model makes it possible to operate and replace the hydrogen sensor and its related data transmission devices and data processing devices separately, making the on-site calibration operation of the customer simpler and the maintenance of the maintenance personnel simpler and more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiment of the utility model and its design scheme, the following is a brief introduction to the drawings required for the embodiment. The drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 It is a front view of an embodiment of the utility model;

[0019] Figure 2 It is the AA view of the embodiment of the utility model;

[0020] Figure 3 A top view of an embodiment of the utility model;

[0021] Figure 4This is an exploded view of an embodiment of the present invention.

[0022] In the figure: 1. hollow body; 2. sealed air chamber; 3. sealing ring; 4. sealing plate; 5. hydrogen detection sensor; 6. pressure block; 7. air inlet nozzle; 8. air outlet nozzle; 9. base; 10. shell; 11. countersunk screw; 12. hexagon socket screw; 13. cross screw; 14. copper column; 15. second PCB board; 16. nut; 17. temperature sensor; 18. heating paste; 19. thermal insulation cotton; 20. third PCB board; 21. partition plate. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the technical solution of the utility model and implement it, the utility model is described in detail below in conjunction with the accompanying drawings and specific embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and cannot be used to limit the protection scope of the utility model.

[0024] Example

[0025] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, this embodiment provides a thermal conductivity hydrogen transmitter.

[0026] It includes a base 9, a shell 10 fixed on the base 9, the shell 9 is fixedly docked with the base 9, a sealed air chamber 2 for gas to enter is provided in the shell 10, the sealed air chamber 2 is formed by a hollow body 1 fixed in the shell 10 and fixedly connected to the base 9 at the bottom, and a sealing device fixedly provided in the middle of the hollow body 1, the lower part of the hollow body 1 is inserted into the groove on the surface of the base 9, and then the base 9 is fixedly connected to the hollow body 1 through the bottom of the base 9 by countersunk screws;

[0027] Two grooves are provided on the upper end surface of the base 9, and the air inlet nozzle 7 and the air outlet nozzle 8 extend into the sealed air chamber 2 through the grooves and the shell 10 respectively and communicate with the sealed air chamber 2; specifically, the ends of the air inlet nozzle 7 and the air outlet nozzle 8 extend into the hollow body 1 respectively, and the air inlet nozzle 7 is used to introduce the gas to be detected, and the air outlet nozzle 8 is used to discharge the gas that has been detected;

[0028] A hydrogen detection sensor 5 for detecting the hydrogen concentration in the gas entering the sealed gas chamber 2 and a temperature sensor 17 for detecting the temperature are provided in the hollow body 1. The hydrogen detection sensor 5 and the temperature sensor 17 are conventional sensors in the art, and their specific models and structures are not described in detail here. The hydrogen detection sensor 5 and the temperature sensor 17 are electrically connected to the PCB board respectively, and the detected signals are transmitted to the terminal through the PCB board.

[0029] In one embodiment, the sealing device is composed of a sealing plate 4 in a hollow body 1 and a pressing block 6 that fixes the sealing plate 4 to the hollow body 1. Specifically, during installation, a circular step is provided in the hollow body 1, and the inner diameter above the circular step is larger than the inner diameter below. Figure 2 As shown, the sealing plate 4 is placed on the circular step, and the pressing block 6 is a cylindrical raised platform. The protrusion of the pressing block 6 is pressed onto the sealing plate 4, and then the pressing block is fixedly connected to the hollow body 1 by the hexagon socket screw 12 to complete the fixing of the sealing plate 4, so that the sealed air chamber 2 is more sealed, and the hydrogen detection sensor is arranged inside the sealed air chamber 2, and the temperature sensor is arranged on the pressing block 6 and outside the sealed air chamber 2 to ensure that the detection of the hydrogen detection sensor is more accurate. The temperature sensor can detect the temperature of the entire device, and the temperature control can be performed according to the temperature condition. In order to improve the sealing performance in one embodiment, a circular sealing ring 3 is directly arranged between the sealing plate 4 and the circular step in another embodiment to improve the sealing performance.

[0030] In another embodiment, a heat-insulating cotton 19 is provided on the outer jacket of the hollow body 1, and a heating paste 18 is provided between the heat-insulating cotton 19 and the hollow body 1. The heat-insulating cotton 19 is used to insulate the gas in the sealed air chamber 2 to prevent the gas entering the sealed air chamber 2 from losing temperature. The heating paste 18 is used to heat the gas entering the sealed air chamber 2, mainly for the constant temperature effect, thereby providing a constant temperature environment for the detection of hydrogen and improving the detection accuracy.

[0031] In another embodiment, a partition plate 21 is fixedly provided in the housing 10, the partition plate is located below the second PCB board 15, and the partition plate 21 is fixedly connected to the inner wall of the housing 10 or is an integral structure. In this embodiment, the partition plate 21 and the housing 10 are an integral structure. In this embodiment, the PCB board includes a first PCB board arranged below the sealing plate 4, a second PCB board 15 and a third PCB board 20 arranged on the upper part of the housing 10, the third PCB board 20 is located below the second PCB board 15, the hydrogen detection sensor is arranged on the first PCB board, the temperature sensor 17 is electrically connected to the second PCB board 15, and the first PCB board and the second PCB board 15 are electrically connected to the third PCB board 20 respectively;

[0032] Specifically, during the design, the first PCB board is fixedly connected to the bottom of the sealing board 4, and the hydrogen detection sensor is welded on the first PCB board, which can ensure that the hydrogen detection sensor is in a sealed environment when performing gas detection, and the detection is more accurate; during the electrical connection, a signal line is welded on the top of the hydrogen detection sensor adapter first PCB board, and the other end of the signal line is connected to the power supply, temperature control and signal processing circuit board by a plug connection (J4).

[0033] At least two copper pillars 14 are fixed on the partition plate 21, and the two copper pillars 14 are fixedly connected to the partition plate 21 by countersunk screws 11 respectively. The through hole on the second PCB board 15 passes through the copper pillar 14 and then a copper pillar 14 is fixedly connected to the copper pillar 14 to fix the second PCB board 15 in the shell 10. The copper pillar 14 on the third PCB board 20 passes through the upper layer and is then fastened by a nut 16 to complete the installation of the third PCB board 20. The second PCB board 15 and the third PCB board 20 are arranged above the partition plate 21 for heat insulation.

[0034] In another embodiment, a cross screw 13 is provided in the middle of the partition plate 21 , and the end of the cross screw 13 passes through the partition plate 21 and presses on the pressing block 6 to further fix the pressing block 6 .

[0035] The model of the temperature sensor is TMP36, and the temperature sensor is connected to the second PCB board 15 by a plug (110).

[0036] The first PCB board, the second PCB board and the third PCB board (MCU main board circuit board) are connected by pin headers (J2 is connected to J9, and J3 is connected to J8).

[0037] The thermal conductivity hydrogen transmitter in this embodiment is powered by a wide voltage of 12 to 24 V and has an RS485 communication interface and a 4 to 20 mA analog output interface.

[0038] In one embodiment, the housing 10 and the base are made of polytetrafluoroethylene.

[0039] The integrated design of the utility model allows the thermal sensor 5 and its related data transmission components and data processing components to be operated and replaced separately, making on-site calibration operations simpler for customers and maintenance more simple and convenient for maintenance personnel.

[0040] It should be noted that the above specific implementation methods can enable those skilled in the art to more fully understand the invention of the utility model, but do not limit the invention of the utility model in any way. Therefore, although the invention of the utility model has been described in detail in this specification and embodiments, those skilled in the art should understand that the invention of the utility model can still be modified or replaced by equivalents; and all technical solutions and improvements that do not deviate from the spirit and scope of the invention of the utility model are included in the protection scope of the patent of the invention of the utility model. Any figure mark in the claims should not be regarded as limiting the claims involved.

Claims

1. A thermal conductivity hydrogen transmitter, characterized in that: It comprises a base (9) and a shell (10) fixed on the base (9), wherein a sealed air chamber (2) is provided in the shell (10); The ends of the air inlet nozzle (7) and the air outlet nozzle (8) provided on both sides of the housing (10) extend into the sealed air chamber (2) and communicate with the sealed air chamber (2); A hydrogen detection sensor (5) for detecting the concentration of hydrogen contained in the gas entering the sealed air chamber (2) through the air inlet nozzle (7) is provided in the sealed air chamber (2), and a temperature sensor (17) for detecting the temperature is provided in the housing (10). The hydrogen detection sensor (5) and the temperature sensor (17) are respectively electrically connected to a PCB board provided on the top of the housing (10).

2. The thermal conductivity hydrogen transmitter according to claim 1, characterized in that: A hollow body (1) connected to the base (9) is fixedly disposed in the shell (10); a sealing device is fixedly connected to the upper portion of the hollow body (1); and a space formed by the hollow body (1) between the sealing device and the base (9) is a sealed air chamber (2).

3. The thermal conductivity hydrogen transmitter according to claim 2, characterized in that: The sealing device comprises a sealing plate (4) arranged in the hollow body (1), the sealing plate (4) being fixedly connected to the hollow body (1) via a pressing block (6) arranged on the hollow body (1), the hydrogen detection sensor (5) being arranged below the sealing plate (4), and the temperature sensor (17) being arranged above the sealing plate (4).

4. The thermal conductivity hydrogen transmitter according to claim 2, characterized in that: The outer shell of the hollow body (1) is provided with heat-insulating cotton (19), and a heating paste (18) is provided between the heat-insulating cotton (19) and the hollow body (1).

5. The thermal conductivity hydrogen transmitter according to claim 1, characterized in that: The PCB board comprises a first PCB board arranged below the sealing plate (4), a second PCB board (15) and a third PCB board (20) arranged on the upper part of the housing (10), the third PCB board (20) being located below the second PCB board (15), the hydrogen detection sensor being arranged on the first PCB board, the temperature sensor (17) being electrically connected to the second PCB board (15), and the first PCB board and the second PCB board (15) being electrically connected to the third PCB board (20) respectively.

6. The thermal conductivity hydrogen transmitter according to claim 5, characterized in that: A partition plate (21) is fixedly provided inside the housing (10), the partition plate is located below the second PCB board (15), and the partition plate (21) is fixedly connected to the inner wall of the housing (10) or is an integral structure.

7. The thermal conductivity hydrogen transmitter according to claim 3, characterized in that: A circular step is provided in the hollow body (1), the sealing plate (4) is located on and overlapped with the circular step, and a circular sealing ring (3) is provided between the sealing plate and the circular step.

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