Humidity control structure and semiconductor combustible gas sensor

Abstract

The utility model discloses a humidity control structure and semiconductor combustible gas sensor belong to sensor technical field, and it is designed to solve the problem of semiconductor combustible gas sensor's influence by environment humidity, the detection precision drops, and the easy false alarm and the missing report, and technical scheme main points are: humidity control structure contains the cover, and the top central is equipped with the air inlet, and the inlaying flow guide fan, and the flow guide fan mounting frame inner wall is surrounded with the electric heating wire of sticking, and the cover is in the sticking micro -humidity sensor, and the cover side wall lower side is equipped with two air outlets symmetrically, and the flow guide fan blows the wind to the cover, semiconductor combustible gas sensor contains above -mentioned humidity control structure and sensor body, and the cover is connected with the body screw thread, and the body bottom has the integrated circuit board, and is inserted through the pin and the jack, and the micro -humidity sensor and electric heating wire wire are inserted through the plug and the socket. The utility model can reduce the humidity influence, guarantee the detection precision, improve the reliability and stability, prolong the life.

Description

Technical Field

[0001] This utility model relates to the field of agricultural fertilization technology, and in particular to a humidity control structure and a semiconductor combustible gas sensor. Background Technology

[0002] Semiconductor combustible gas sensors have been widely used in many fields such as industrial safety, environmental monitoring, and smart homes due to their advantages such as high sensitivity, fast response speed, and low cost. They detect the concentration of combustible gas based on the gas-sensing effect of semiconductor materials and reflect the gas concentration through the change in surface resistance of the sensitive element.

[0003] In practical use, ambient humidity has a significant impact on sensor performance. In humid environments, water molecules are easily adsorbed on the surface of the sensor's sensitive element, competing with the gas molecules to be detected for adsorption sites and changing the surface resistance characteristics of the sensitive element. This can lead to a decrease in sensor detection accuracy, potentially resulting in false alarms or missed alarms, and seriously affecting the reliability and stability of the sensor.

[0004] To address the aforementioned problems, this utility model document proposes a humidity control structure and a semiconductor combustible gas sensor. Utility Model Content

[0005] This invention provides a humidity control structure and a semiconductor combustible gas sensor, which solves the problem that in the prior art, the ambient humidity has a significant impact on the sensor performance. In humid environments, water molecules are easily adsorbed on the surface of the sensor's sensitive element, competing with the gas molecules to be detected for adsorption sites and changing the surface resistance characteristics of the sensitive element. This leads to a decrease in the sensor's detection accuracy and may result in false alarms or missed alarms, seriously affecting the reliability and stability of the sensor.

[0006] This utility model provides the following technical solution:

[0007] A humidity control structure, comprising:

[0008] The housing has an air inlet at the center of its top, a deflector fan is embedded in the air inlet, an electric heating wire is glued to the inner wall of the deflector fan mounting bracket, and a miniature humidity sensor is glued to the inside of the housing.

[0009] In one possible design, two air outlets are symmetrically arranged along the lower edge of the sidewall of the housing.

[0010] In one possible design, the airflow fan blows air into the housing.

[0011] This utility model also provides a semiconductor combustible gas sensor, including the humidity control structure described in any one of the above, and a semiconductor combustible gas sensor body suitable for detecting gases such as methane, liquefied gas, and hydrogen. The housing is threadedly connected to the outer wall of the semiconductor combustible gas sensor body housing by the internal thread along the lower edge of the inner wall.

[0012] In one possible design, the bottom of the semiconductor combustible gas sensor body is provided with a matching integrated circuit board, and the semiconductor combustible gas sensor body is fixed by being plugged into corresponding sockets on the integrated circuit board through multiple pins on the bottom.

[0013] In one possible design, the other end of both the miniature humidity sensor and the electric heating wire is plugged into a corresponding socket on the integrated circuit board via a plug.

[0014] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit the present invention.

[0015] The working principle and usage process of this technical solution are as follows:

[0016] After the semiconductor combustible gas sensor body starts working, the air guide fan rotates continuously, introducing airflow into the housing so that the gas chamber at the top of the semiconductor combustible gas sensor body can contact the gas. At the same time, the miniature humidity sensor starts to monitor the humidity inside the housing in real time. The miniature humidity sensor transmits the monitored humidity data to the miniature control chip on the integrated circuit board for analysis. If the humidity is within the normal range, the sensor body detects the combustible gas concentration normally; if the humidity exceeds the preset threshold, the system determines that humidity adjustment is required.

[0017] During humidity regulation, the micro control chip on the integrated circuit board controls the electric heating wire to start heating. The air guide fan blows outside air into the housing from the air inlet. The air is heated as it passes through the electric heating wire. The hot air reduces the relative humidity of the air inside the housing. The heated and dry air circulates inside the housing and is discharged through the air outlet on the lower edge of the side wall of the housing, forming air circulation and accelerating the humidity regulation process. Afterward, the micro humidity sensor continuously monitors the humidity. When the humidity drops to the normal range, the micro control chip on the integrated circuit board controls the electric heating wire to stop heating, while the air guide fan continues to work to maintain the air circulation and stability inside the housing.

[0018] This utility model has the following beneficial effects:

[0019] This invention reduces the impact of ambient humidity on semiconductor combustible gas sensors through a humidity control structure, avoids water molecules adsorbing on the surface of the sensor's sensitive element, reduces competition for adsorption sites with gas molecules, ensures the stability of the surface resistance characteristics of the sensitive element, thereby improving the sensor's detection accuracy and reducing the probability of false alarms or missed alarms.

[0020] The humidity control structure in this invention can monitor and adjust the humidity inside the housing in real time, enabling the sensor to maintain relatively stable performance within a certain humidity environment. This improves the reliability and stability of the sensor in complex environments and extends the sensor's service life.

[0021] In this invention, the humidity control structure is integrated with the semiconductor combustible gas sensor body via a threaded connection, which facilitates disassembly and replacement without affecting the original structure and performance of the sensor body, and has good compatibility. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram provided for an embodiment of the present utility model;

[0023] Figure 2 This is a disassembly diagram of an embodiment of the present utility model;

[0024] Figure 3 This is a schematic diagram of the internal structure of the housing provided in an embodiment of the present utility model;

[0025] Figure 4 This is a schematic diagram of the humidity control structure provided in an embodiment of the present invention.

[0026] Reference numerals: 1. Cover; 2. Air inlet; 3. Flow fan; 4. Air outlet; 5. Miniature humidity sensor; 6. Heating wire; 7. Semiconductor combustible gas sensor body; 8. Pin; 9. Integrated circuit board; 10. Socket; 11. Plug; 12. Socket. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0028] In the description of this utility model, it should be understood that the terms "opening", "upper", "middle", "length", "inner", etc., which indicate orientation or positional relationship, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements 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.

[0029] To keep the following description of the embodiments of this utility model clear and concise, detailed descriptions of known functions and known components are omitted.

[0030] In one embodiment:

[0031] Please refer to Figure 1-4 A humidity control structure mainly includes a housing 1, a deflector fan 3, an electric heating wire 6, and a miniature humidity sensor 5.

[0032] The housing 1 is made of plastic material with certain strength and corrosion resistance. An air inlet 2 is opened in the center of its top. The size of the air inlet 2 is designed to be adapted to the size of the guide fan 3 to ensure that the guide fan 3 can be smoothly embedded and installed. The inner wall of the air inlet 2 is smoothed to reduce airflow resistance.

[0033] The air guide fan 3 is a miniature DC fan, and its mounting bracket is made of metal to ensure structural stability. After the air guide fan 3 is embedded into the air inlet 2, it is fixed with screws to ensure that the air guide fan 3 will not shake during operation. The inner wall of the mounting bracket of the air guide fan 3 is glued and fixed with an electric heating wire 6. The winding density and length of the electric heating wire 6 are designed according to the actual heating requirements to ensure that enough heat can be generated to heat the incoming air. The working principle of the electric heating wire 6 is based on the thermal effect of electric current. When the electric heating wire 6 passes through the electric heating wire 6, due to the suitable resistivity of the electric heating wire 6, the current does work and consumes electrical energy, generating heat. The electric heating wire 6 is made of nickel-chromium alloy, which has good high temperature resistance and stable resistance characteristics. After being energized, it acts as a metal conductor to dissipate heat, converting electrical energy into heat energy, thereby heating the air entering the housing 1.

[0034] The miniature humidity sensor 5 is glued to a suitable position on the inner wall of the housing 1. This position should be able to accurately reflect the humidity inside the housing 1. The miniature humidity sensor 5 adopts the resistive working principle. Its substrate is covered with a film made of moisture-sensitive material. When water vapor in the air is adsorbed on the moisture-sensitive film, the resistivity and resistance value of the element will change. As the ambient humidity increases, the moisture-sensitive resistor absorbs moisture, resulting in a decrease in resistance value. By measuring the change in resistance value, the humidity inside the housing 1 can be calculated.

[0035] Two air outlets 4 are symmetrically arranged along the lower edge of the side wall of the cover 1. The air outlets 4 are rectangular in shape, and their size is designed according to the actual airflow requirements to ensure that hot air can be discharged smoothly.

[0036] A semiconductor combustible gas sensor includes the aforementioned humidity control structure and a semiconductor combustible gas sensor body 7 suitable for detecting gases such as methane, liquefied petroleum gas, and hydrogen. The semiconductor combustible gas sensor body 7 adopts an existing mature product. The semiconductor combustible gas sensor body 7 mainly detects the concentration of combustible gas based on the semiconductor gas-sensing effect. Under certain temperature conditions, when the gas to be measured reaches the surface of the semiconductor sensitive material, it will undergo a chemical reaction with the oxygen adsorbed on its surface, causing a change in the resistance of the semiconductor sensitive material. The rate of change of resistance is exponentially related to the concentration of the gas to be measured. The gas concentration can be measured by measuring the change in resistance. For example, when a reducing gas (such as hydrogen or carbon monoxide) undergoes an oxidation reaction with the oxygen adsorbed on the semiconductor surface, the resistance value of the sensor will decrease; while for oxidizing gases, the resistance value may increase.

[0037] The outer wall of the housing of the semiconductor combustible gas sensor body 7 is provided with external threads, and the lower edge of the inner wall of the cover 1 is provided with matching internal threads. The cover 1 and the semiconductor combustible gas sensor body 7 are tightly connected by the threaded connection. This connection method is convenient for disassembly and replacement. When it is necessary to repair or replace parts, the cover 1 can be removed from the sensor body 7 simply by rotating it, without affecting the original structure and performance of the sensor body 7.

[0038] The bottom of the semiconductor combustible gas sensor body 7 is equipped with a matching integrated circuit board 9. The integrated circuit board 9 integrates a micro control chip, power management circuit, signal processing circuit, etc. The sensor body 7 is fixed by multiple pins 8 on the bottom and corresponding sockets 10 on the integrated circuit board 9. The number and position of the pins 8 and sockets 10 are designed according to the signal output requirements of the sensor body 7 to ensure that the sensor body 7 can be stably connected to the integrated circuit board 9 and realize accurate signal transmission. The other ends of the wires of the micro humidity sensor 5 and the electric heating wire 6 are connected to the corresponding sockets 12 on the integrated circuit board 9 through plugs 11. The plugs 11 and sockets 12 adopt standard specifications to ensure the reliability and universality of the connection. Similarly, the deflector fan 3 can also be electrically connected to the integrated circuit board 9 by plugging in the plugs 11 and sockets 12.

[0039] The integrated circuit board 9 fixes electronic components onto an insulating substrate using surface mounting or through-hole connections, and connects these components via conductive paths to achieve circuit functions. It includes power management circuits, signal processing circuits, etc. Power supply voltage is transmitted to each component through conductive paths, providing them with the necessary electrical energy for operation. Signal transmission also occurs through conductive paths, with signal current flowing along copper foil lines from one component to another. The electronic components in the integrated circuit board 9 process signals, such as amplification and filtering. These processes are typically achieved through semiconductor materials within the electronic components. For example, the miniature humidity sensor 5 and the semiconductor combustible gas sensor body 7 transmit the detected humidity and gas concentration signals to the integrated circuit board 9. After processing by the signal processing circuit, the corresponding detection results are output. These results can be digital or analog signals. Digital signals are typically represented by high and low levels, while analog signals can be represented by continuously changing waveforms. The output results can be transmitted to other devices or components via conductive paths, or displayed through devices such as displays and speakers.

[0040] When the semiconductor combustible gas sensor starts working, the guide fan 3 rotates continuously, blowing outside air into the housing 1 from the air inlet 2, so that the air chamber at the top of the semiconductor combustible gas sensor body 7 can come into contact with the gas. At the same time, the miniature humidity sensor 5 starts to monitor the humidity inside the housing 1 in real time and transmits the monitored humidity data to the miniature control chip on the integrated circuit board 9 for analysis.

[0041] If the humidity is within the normal range, the sensor body 7 will detect the concentration of combustible gas normally. The gas concentration signal detected by the sensor body 7 will be transmitted to the integrated circuit board 9 through the pin 8 and the socket 10. After being processed by the signal processing circuit, the corresponding detection result will be output.

[0042] If the humidity exceeds the preset threshold, the system determines that humidity adjustment is required. The micro control chip on the integrated circuit board 9 controls the electric heating wire 6 to start heating. The guide fan 3 blows outside air into the housing 1 from the air inlet 2. The air is heated when it passes through the electric heating wire 6. After the hot air enters the housing 1, the relative humidity of the air inside is reduced. The heated dry air circulates in the housing 1 and is discharged through the air outlet 4 at the lower edge of the side wall of the housing 1, forming air circulation and accelerating the humidity adjustment process.

[0043] During the humidity regulation process, the miniature humidity sensor 5 continuously monitors the humidity and feeds back the humidity data to the miniature control chip in real time. When the humidity drops to the normal range, the miniature control chip controls the electric heating wire 6 to stop heating, while the air guide fan 3 continues to work to maintain the air circulation and stability inside the housing 1, ensuring that the sensor body 7 can work continuously and stably in a suitable humidity environment.

[0044] This application can be used for tea production, or for other fields applicable to this application.

[0045] However, as is well known to those skilled in the art, the working principles and wiring methods of the miniature humidity sensor 5, the electric heating wire 6, the semiconductor combustible gas sensor body 7, and the integrated circuit board 9 are commonplace and belong to conventional methods or common knowledge. They will not be described in detail here. Those skilled in the art can make any selections according to their needs or convenience.

[0046] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0047] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. In the absence of conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A humidity control structure, characterized in that, include: The cover (1) has an air inlet (2) at the center of the top of the cover (1), and a guide fan (3) is embedded in the air inlet (2). An electric heating wire (6) is glued around the inner wall of the guide fan (3) mounting bracket, and a miniature humidity sensor (5) is glued inside the cover (1).

2. The humidity control structure according to claim 1, characterized in that, The lower edge of the side wall of the cover (1) is symmetrically provided with two air outlets (4).

3. The humidity control structure according to claim 1, characterized in that, The air guide fan (3) blows air into the casing (1).

4. A semiconductor combustible gas sensor, characterized in that, The humidity control structure included in any one of claims 1 to 3 also includes a semiconductor combustible gas sensor body (7) suitable for detecting methane, liquefied gas, and hydrogen gas, wherein the housing (1) is threadedly connected to the external thread on the outer wall of the semiconductor combustible gas sensor body (7) by an internal thread along the lower edge of the inner wall.

5. A semiconductor combustible gas sensor according to claim 4, characterized in that, The semiconductor combustible gas sensor body (7) is provided with an integrated circuit board (9) for use at the bottom. The semiconductor combustible gas sensor body (7) is connected and fixed to the corresponding sockets (10) on the integrated circuit board (9) through multiple pins (8) at the bottom.

6. A semiconductor combustible gas sensor according to claim 5, characterized in that, The other ends of the wires of the miniature humidity sensor (5) and the electric heating wire (6) are connected to the corresponding sockets (12) on the integrated circuit board (9) via plugs (11).

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