High-humidity-resistant gas detector

Abstract

The invention discloses a high-humidity-resistant gas detector, and relates to the technical field of gas detection, the high-humidity-resistant gas detector comprises a housing, and an air duct cavity, a dehumidification unit, a control valve, a gas detection unit and a pneumatic device arranged in the housing; the shell is provided with a first air inlet and a first air outlet, the air duct cavity and the gas detection unit are both installed in the shell, and the air duct cavity is located on the side, close to the first air inlet, of the gas detection unit. According to the high-humidity-resistant gas detector, through cooperation of the condensate water tank and the semiconductor refrigeration chip in the dehumidification structure, high-humidity to-be-detected gas is subjected to cooperative dehumidification, so that the possibility of atomization and condensation in the gas detection unit is greatly reduced, and the dehumidification efficiency is improved; and the pneumatic device is linked with the control valve, so that the to-be-detected gas reaches the preset temperature and humidity after passing through the dehumidification unit and enters the gas detection unit for detection, and the gas concentration detection accuracy and reliability are effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas detectors, in particular to a high-humidity resistant gas detector. Background Art

[0002] Gas detectors are key equipment for environmental monitoring, industrial safety, and disaster warning, and are widely used in high-humidity environments such as the petrochemical industry, mining operations, and wastewater treatment. Traditional gas detection technologies (such as spectral absorption, electrochemical, and semiconductor sensors) are susceptible to interference from ambient humidity in practical applications (e.g., detecting methane leaks in oil and gas wells, agricultural greenhouses, and urban pipelines). Detection accuracy significantly decreases in relative humidity, particularly in conditions exceeding 80%, leading to false alarms or even failure, severely limiting device reliability and applicability. In high-humidity environments, for laser / infrared spectral absorption gas sensors, water vapor intrusion can cause fogging on the optical lens surface, disrupting the sensor's optical path and compromising the accuracy and reliability of gas concentration readings. Furthermore, the absorption peak of water vapor can overlap with that of the target gas, interfering with detection. For electrochemical sensors, water vapor intrusion can dilute the electrolyte, affecting detection performance. For semiconductor sensors, water molecules adsorb on the sensor's sensitive surface, competing with the target gas for reactive sites and reducing sensitivity.

[0003] At present, the improvement methods for high humidity environment include heating dehumidification method, physical isolation method and algorithm compensation method. For example, the Chinese invention patent with publication number CN220932767U discloses an anti-fog device, an optical path detection module and a photochemiluminescence detector. The photochemiluminescence detector includes an incubation module and an optical path detection module. The optical detection assembly includes a detection seat. The anti-fog device is installed on the detection seat. The optical lens is arranged in the anti-fog device. The anti-fog device includes a heating seat, a heating plate and a clamping ring. The heating plate is used to heat the heating seat. The clamping ring can adaptively contact with the convex surface of the optical lens to press the flat surface of the optical lens against the heating seat. The heating seat is heated by the heating plate, and the heating seat transfers the heat to the optical lens, so that the optical lens is heated evenly. While ensuring that the optical lens will not fog due to temperature difference, the service life of the optical lens is also extended. However, the anti-fog achieved by the anti-fog device in the above technical solution will increase the power consumption of the whole machine due to the excessive heating power.

[0004] Patent CN114609077A discloses a device for measuring gaseous methane in sewage pipe networks. The device includes a dehumidification chamber, an infrared methane sensor, and a PLC controller. Before measuring gaseous methane, the humidity of the gas to be measured is effectively reduced in the dehumidification chamber containing a silica gel desiccant to ensure accurate methane measurement. However, the drying structure used in this technical solution has an absorption limit, requiring regular maintenance and replacement, resulting in high labor costs.

[0005] Patent CN119804372A discloses a high-humidity resistant gas concentration detection method. This method acquires ambient temperature and humidity parameters to form a multi-parameter data set. A compensation function is then established based on the humidity parameters to dynamically correct the main channel data. The corrected main channel transmittance change rate is calculated, and the humidity interference characteristic is extracted. A compensation matrix is ​​constructed in conjunction with the temperature parameter to generate characteristic parameters that incorporate environmental compensation. Finally, the concentration is converted in conjunction with the environmental compensation parameters to output the final gas concentration value. This method, through the simultaneous acquisition of multiple parameters and the environmental compensation mechanism, effectively resolves the interference problem of infrared gas detection in high-temperature and high-humidity environments. The method is particularly suitable for continuous online monitoring of high-temperature and high-humidity working conditions. However, this solution corrects the detection signal by obtaining humidity data, but the adaptability of the compensation model is difficult to ensure when the humidity changes dynamically, and it cannot solve the problem of physical damage to the sensor body caused by water vapor erosion.

[0006] In summary, the existing gas detector anti-high humidity technology has the problems of high power consumption, incomplete dehumidification and poor reliability. Summary of the Invention

[0007] In view of this, the purpose of the present invention is to provide a gas detector that is resistant to high humidity to ensure that the gas detector is not affected by humidity during operation and to improve the accuracy and reliability of gas concentration detection.

[0008] To achieve the above-mentioned object, the present invention provides a high-humidity resistant gas detector, comprising: a housing, and an air duct cavity, a dehumidification unit, a control valve, a gas detection unit, and a pneumatic device arranged in the housing; The outer wall of the housing is provided with a first air inlet and a first air outlet for the inflow and outflow of the gas to be measured; The air duct cavity and the gas detection unit are both installed inside the housing, the air duct cavity is located on a side of the gas detection unit close to the first air inlet, the air duct cavity is provided with a first air guide port connected to the first air inlet, and the gas detection unit is provided with a second air inlet connected to the first air guide port and a second air outlet connected to the first air outlet; The dehumidification unit includes a dehumidification structure and a temperature and humidity measuring component for detecting the temperature and humidity of the gas to be tested before and after dehumidification by the dehumidification structure; The pneumatic device is used to drive the gas flow so that the external gas to be measured enters the housing and flows along the path of the air duct cavity, the dehumidification unit and the gas detection unit; The control valve includes a first valve component and a second valve component. The first valve component is installed at the first air guide port of the air duct cavity, and the second valve component is installed at the output end of the pneumatic device. The first valve component and the second valve component are suitable for automatically opening when the pneumatic device is working, so as to introduce the gas to be measured from the first air inlet into the dehumidification unit for dehumidification to reach the preset temperature and humidity, and then enter the gas detection unit for detection.

[0009] Furthermore, the preset temperature and humidity are determined according to the dew point temperature and relative humidity inside the gas detection unit.

[0010] Furthermore, the dehumidification structure includes two boxes and at least one semiconductor refrigeration chip, the boxes are condensation water tanks or heating chambers, and at least one of the two boxes is a condensation water tank. The semiconductor refrigeration chip includes a cooling surface and a heating surface. The cooling surface of at least one semiconductor refrigeration chip is attached to at least one condensation water tank, and the heating surface of at least one semiconductor refrigeration chip is used to heat and dehumidify the condensed gas. The temperature and humidity measurement component includes a first temperature and humidity sensor and a second temperature and humidity sensor. The first temperature and humidity sensor is installed at the air inlet of the condensation water tank to detect the temperature and humidity of the gas to be measured before dehumidification; the second temperature and humidity sensor is installed at the air outlet of the condensation water tank to detect the temperature and humidity of the gas to be measured before and after dehumidification.

[0011] Furthermore, the two boxes are a first condensation water tank and a second condensation water tank symmetrically distributed along the first air inlet of the shell and arranged on corresponding sides of the air duct cavity. The first condensation water tank and the second condensation water tank are both provided with a water tank air inlet and a water tank air outlet, and the air duct cavity is also provided with a second air guide port corresponding to the position of the second air inlet.

[0012] Furthermore, a semiconductor refrigeration chip is respectively provided between the first condensation water tank, the second condensation water tank and the gas detection unit, and the cooling surfaces of the two semiconductor refrigeration chips are respectively attached to the first condensation water tank and the second condensation water tank, and the heating surfaces of the two semiconductor refrigeration chips are both attached to the gas detection unit.

[0013] Furthermore, the two boxes are respectively a third condensation water tank and a heating chamber which are symmetrically distributed up and down along the first air inlet of the shell and arranged in the air duct cavity. The third condensation water tank and the heating chamber are both provided with an air inlet and an air outlet. The air outlet of the third condensation water tank is connected to the air inlet of the heating chamber, and the air outlet of the heating chamber is connected to the second air inlet on the gas detection unit.

[0014] Furthermore, the semiconductor refrigeration chip is arranged between the third condensing water tank and the heating chamber, the cooling surface of the semiconductor refrigeration chip is attached to the third condensing water tank, and the heating surface of the semiconductor refrigeration chip is attached to the heating chamber, so that the gas to be measured passes through the third condensing water tank and the heating chamber in sequence and then enters the gas detection unit.

[0015] Furthermore, the condensation water tank is provided with a condensation structure, wherein: The condensation structure includes a baffle base connected to the condensation water tank along the length direction, a plurality of first baffles connected to the baffle base in parallel and at intervals, and a plurality of second baffles inserted in parallel and staggered between two adjacent first baffles. The top of the second baffle is connected to the top wall of the condensation water tank. The baffle base is provided with a V-shaped groove between two adjacent first baffles, and a water inlet hole is provided at the bottom of the V-shaped groove.

[0016] Furthermore, the condensation water tank and the condensation structure are both made of metal material with a mirror surface; and / or The condensation structure is plated with a hydrophobic composite coating.

[0017] Furthermore, a collecting trough is provided on the bottom wall of the condensing water tank between the condensing water tank and the baffle base to receive the condensing water flowing out through the water inlet hole, and the bottom of the condensing water tank is connected to a drain pipe connected to the bottom of the collecting trough.

[0018] Furthermore, the high humidity resistant gas detector further comprises: A water level monitor is installed in the collection tank. The water level monitor is used to monitor the water level in the collection tank, so as to automatically start drainage after the water level monitor detects that the water level in the collection tank reaches a set threshold.

[0019] Furthermore, the second valve member is installed at the second gas outlet of the gas detection unit to prevent high-humidity gas in the environment from entering the gas detection unit through the second gas outlet.

[0020] Furthermore, the control valve is a one-way valve, a solenoid valve, a check valve or an electric valve.

[0021] Furthermore, the pneumatic device is a fan or a pump.

[0022] Furthermore, the gas detection unit is any one of an optical gas detection component, an electrochemical gas detection component, and a semiconductor-based gas detection component.

[0023] Furthermore, the gas detection unit is a laser gas detection unit, which includes a gas chamber, a light emitting device located in the gas chamber and used to emit a light beam, a reflective lens installed in the gas chamber and used to reflect the light beam, and a light receiving device installed in the gas chamber and used to receive the light beam.

[0024] Furthermore, the high humidity resistant gas detector further comprises: The grille assembly includes an air inlet grille structure and an air outlet grille structure respectively installed at the first air inlet and the first air outlet of the shell; the air inlet grille structure and the air outlet grille structure are also provided with a filtering component for filtering water vapor and dust impurities in the gas to be measured.

[0025] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. This high-humidity resistant gas detector is set up through the linkage of the pneumatic device and the control valve. When gas detection is required, the first valve component and the second valve component in the pneumatic device and the control valve can be opened synchronously to introduce the gas to be tested into the dehumidification unit of the air duct cavity. After the temperature and humidity measurement component detects that the gas to be tested has been dehumidified to the preset temperature and humidity, it is allowed to enter the gas detection unit for detection, so as to effectively prevent the gas from condensing during the detection process, and effectively improve the accuracy and reliability of the detection results; In addition, during the dehumidification process, the setting of the dehumidification structure in the dehumidification unit can realize the dehumidification treatment of the high-humidity gas to be tested. The condensation water tank in the dehumidification structure adopts an air duct formed by multiple baffles, which can extend the air path of the high-humidity gas to be tested and improve the dehumidification effect. The cooling surface of the semiconductor refrigeration chip in the dehumidification structure is attached to the condensation water tank to enhance the condensation effect, and the heating surface of the semiconductor refrigeration chip can further heat and dehumidify the condensed gas to be tested, so as to effectively improve the dehumidification efficiency of the dehumidification structure.

[0026] 2. The high-humidity resistant gas detector sets temperature and humidity sensors at the air inlet and outlet of the condensation water tank respectively to detect the temperature and humidity of the high-humidity gas to be tested before and after dehumidification, and compares the temperature and humidity of the dehumidified gas to be tested with the preset temperature and humidity. When the temperature and humidity of the dehumidified gas to be tested reaches the preset temperature and humidity, the gas to be tested entering the gas detection unit at this time will not condense and can directly enter the gas detection unit for detection; when the temperature of the dehumidified gas to be tested does not reach the preset temperature and humidity, the semiconductor refrigeration chip is started to work in conjunction with the condensation water tank to dehumidify to reach the preset temperature and humidity. This working mode not only ensures the detection accuracy and reliability of the gas detector, but also reduces power consumption.

[0027] 3. The high-humidity resistant gas detector is constructed by installing a first control valve at the first air inlet of the air duct cavity and a second control valve at the output end of the pneumatic device. The first control valve, the second control valve and the pneumatic device are linked to each other. The two valves are automatically opened when the pneumatic device is working to introduce the gas to be tested into the gas detector for dehumidification and detection. When the pneumatic device is not working, the two valves protect the gas detector to prevent high-humidity gas in the environment from invading the gas detector to form condensation. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the main structure of the high-humidity resistant gas detector in Example 1 of the present invention with the cover removed; Figure 2 for Figure 1 Schematic diagram of the enlarged structure at A in the middle; Figure 3 This is a schematic diagram of the top view of the high-humidity resistant gas detector in Example 1 of the present invention with the cover removed; Figure 4 This is a structural stereogram of the high-humidity resistant gas detector in Example 1 of the present invention with the cover removed; Figure 5 This is a schematic diagram of the transverse cross-sectional structure of the air duct cavity of the high-humidity resistant gas detector in Example 1 of the present invention; Figure 6 This is a schematic cross-sectional view of the first condensation water tank of the high-humidity resistant gas detector in Example 1 of the present invention; Figure 7 Schematic diagram of the three-dimensional structure of the electric gas valve of the high-humidity resistant gas detector in Example 1 of the present invention; Figure 8 This is a schematic cross-sectional view of the electric valve of the high-humidity resistant gas detector in Example 1 of the present invention; Figure 9 This is a partial front cross-sectional structural diagram of a high-humidity resistant gas detector in Example 2 of the present invention; Figure 10This is a schematic diagram of the three-dimensional structure of the third condensation water tank and the heating chamber of the high-humidity resistant gas detector in the second embodiment of the present invention; Figure 11 This is a schematic diagram of the transverse cross-sectional structure of the third condensation water tank and the heating chamber of the high-humidity resistant gas detector in Example 2 of the present invention.

[0029] Description of reference numerals: 1- Dehumidification structure; 11-first condensation water tank; 12-second condensation water tank; 13-third condensation water tank; 14-heating chamber; 15-water tank air inlet; 16-water tank air outlet; 17-collection tank; 18-temperature and humidity measurement assembly; 181-first temperature and humidity sensor; 182-second temperature and humidity sensor; 19-U-shaped tube; 2- condensation structure; 21- baffle base; 211- V-shaped groove; 212- water diversion hole; 22- first baffle; 23- second baffle; 24- drain pipe; 3-Control valve; 31-first valve member; 32-second valve member; 33-electric valve; 331-stepping motor; 332-piston screw rod; 333-push rod; 4- air duct cavity; 41-first air guide port; 42-second air guide port; 5-housing; 51-housing; 52-cover plate; 6-Gas detection unit; 61-light emitting device; 62-reflecting lens; 63-light receiving device; 64-air chamber; 641-second air inlet; 7-Grille assembly; 71- air intake grille structure; 72- air outlet grille structure; 8-Filter component; 81- waterproof breathable membrane; 82- filter; 9- fan; 10-Semiconductor refrigeration chip. DETAILED DESCRIPTION

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0033] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like indicate positions or locations based on the positions shown in the accompanying drawings, or the positions or locations in which the inventive product is typically placed when in use. These terms are intended solely to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0034] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0035] See also Figure 1-11 The present embodiment provides a high-humidity resistant gas detector including a housing 5 and an air duct cavity 4, a dehumidification unit, a control valve 3, a gas detection unit 6, and a pneumatic device arranged in the housing 5; the pneumatic device can be a fan 9 or a pump, etc., which allows the ambient air flow to enter the gas detector. The pneumatic device in this embodiment takes the fan 9 as an example.

[0036] A first air inlet and a first air outlet are provided on the outer wall of the shell 5 for the flow in and out of the gas to be measured; the air duct cavity 4 and the gas detection unit 6 are both installed in the shell 5, and the air duct cavity 4 is located on the side of the gas detection unit 6 close to the first air inlet. A first air guide port 41 connected to the first air inlet is provided on the air duct cavity 4 to allow the external gas to be measured to enter the air duct cavity 4 and flow along the air duct cavity 4.

[0037] The gas detection unit 6 is provided with a second air inlet 641 connected to the air duct cavity 4 and a second air outlet corresponding to the input end position of the fan 9, so that the gas flowing through the air duct cavity 4 can enter the gas detection unit 6 through the second air inlet 641 for detection, and the gas after detection can be extracted by the fan 9 through the second air outlet.

[0038] The dehumidification unit is arranged in the air duct cavity 4, and the dehumidification unit includes a dehumidification structure 1 and a temperature and humidity measuring component 18. The dehumidification structure 1 is used to dehumidify the gas to be tested, and the temperature and humidity measuring component 18 is used to detect the temperature and humidity of the gas to be tested before and after dehumidification; the control valve 3 includes a first valve component 31 and a second valve component 32, the first valve component 31 is installed at the first air guide port 41 of the air duct cavity 4, and the second valve component 32 is installed at the output end of the fan 9. The first valve component 31 and the second valve component 32 are suitable for automatically opening when the fan 9 is working, so as to introduce the gas to be tested from the first air inlet into the dehumidification unit for dehumidification to the preset temperature and humidity and then enter the gas detection unit 6 for detection.

[0039] As a further description of the above scheme, the outer shell 5 includes a shell 51 and a cover plate 52. The shell 51 is used to accommodate the air duct cavity 4, the dehumidification unit, the first valve component 31, the gas detection unit 6 and the fan 9, and an opening is provided on one side of the shell 51 for inspection and maintenance of the interior of the shell 51. The open side of the shell 51 is detachably connected to the cover plate 52 to facilitate closing the opening of the shell 51 to protect the internal structure of the shell 51 when in use.

[0040] See also Figure 1-5 and Figure 9-11 The dehumidification structure 1 includes two boxes and at least one semiconductor refrigeration chip 10. The box is a condensation water tank or a heating chamber 14, and at least one of the two boxes is a condensation water tank. The semiconductor refrigeration chip 10 includes a cooling surface and a heating surface. The cooling surface of at least one semiconductor refrigeration chip 10 is attached to the condensation water tank, and the heating surface of at least one semiconductor refrigeration chip 10 is used to heat and dehumidify the condensed gas.

[0041] The temperature and humidity measuring component 18 includes a first temperature and humidity sensor 181 and a second temperature and humidity sensor 182. The first temperature and humidity sensor 181 and the second temperature and humidity sensor 182 are respectively installed at the water tank air inlet 15 and the water tank air outlet 16 of the condensation water tank, and are used to detect the temperature and humidity of the gas to be measured before and after it enters the condensation water tank for condensation.

[0042] As a further description of the above scheme, after the gas to be measured enters the air duct cavity 4, the temperature and humidity of the gas to be measured before and after condensation can be detected by the first temperature and humidity sensor 181 and the second temperature and humidity sensor 182 in the temperature and humidity measuring assembly 18. If the high-humidity gas to be measured is dehumidified by the condensation water tank, when the temperature and humidity of the gas to be measured detected by the second temperature and humidity sensor 182 reaches a preset temperature and humidity (the preset value is determined according to the dew point temperature and relative humidity in the gas detection unit 6), the gas to be measured can enter the gas detection unit 6 for detection without worrying about the risk of condensation of the gas to be measured inside the gas detection unit 6; However, if the temperature and humidity of the high-humidity gas to be measured detected by the second temperature and humidity sensor 182 does not reach the preset temperature and humidity after the high-humidity gas to be measured is dehumidified by the condensing water tank, it indicates that the humidity of the gas to be measured is still high and the dehumidification is not thorough. At this time, the semiconductor refrigeration chip 10 is turned on to work with the condensing water tank for dehumidification. Since the cooling surface of the semiconductor refrigeration chip 10 is attached to the condensing water tank, the condensation effect of the condensing water tank is greatly enhanced; thereby achieving the purpose of utilizing the joint action of the condensing water tank and the cooling surface of the semiconductor refrigeration chip 10 to improve the condensation efficiency of the gas to be measured, effectively reducing the moisture in the gas to be measured and improving the dehumidification effect; at the same time, the temperature generated by the heating surface of the semiconductor refrigeration chip 10 is used to heat and dehumidify the condensed gas, thereby ensuring that the gas to be measured will not affect the detection effect due to condensation inside the gas detection unit 6.

[0043] As an embodiment of the dehumidification structure 1 in the above technical solution: See also Figure 1-5 In this embodiment, the air duct cavity 4 is a U-shaped structure, and the two boxes in the dehumidification structure 1 are a first condensation water tank 11 and a second condensation water tank 12 that are symmetrically distributed and arranged on corresponding sides in the air duct cavity 4. The first condensation water tank 11 and the second condensation water tank 12 are both provided with a water tank air inlet 15 and a water tank air outlet 16. The air duct cavity 4 is also provided with a second air guide port 42 corresponding to the position of the second air inlet 641; it is convenient for the gas to be tested in the air duct cavity 4 to enter the gas detection unit 6 through the second air guide port 42 and the second air inlet 641.

[0044] As a further description of the above scheme, the outer walls of the first condensation water tank 11 and the second condensation water tank 12 are adapted to the inner wall size of the air duct cavity 4, so that the transverse section of the air duct cavity 4 can be conveniently separated into an uncondensed gas active part and a condensed gas active part by using the provided first condensation water tank 11 or the second condensation water tank 12, so as to prevent the uncondensed gas from flowing to the second air inlet 641.

[0045] Specifically, when the gas to be measured flows through the air duct cavity 4, the gas to be measured in the air duct cavity 4 can be condensed by the first condensation water tank 11 and the second condensation water tank 12. The moisture content of the gas to be measured after condensation is reduced, which can achieve a dehumidification effect and reduce the possibility of condensation in the gas detection unit 6.

[0046] See also Figure 1-2 A semiconductor refrigeration chip 10 is respectively provided between the first condensation water tank 11 and the second condensation water tank 12 and the gas detection unit 6. The cooling surfaces of the two semiconductor refrigeration chips 10 are respectively attached to the first condensation water tank 11 and the second condensation water tank 12, and the heating surfaces of the two semiconductor refrigeration chips 10 are both attached to the gas detection unit 6.

[0047] As a further description of the above scheme, the cooling surfaces of the two semiconductor refrigeration chips 10 can cool the first condensation water tank 11 and the second condensation water tank 12 respectively, thereby improving the condensation effect of the first condensation water tank 11 and the second condensation water tank 12, so as to reduce the moisture in the gas after flowing through the first condensation water tank 11 or the second condensation water tank 12, thereby effectively improving the dehumidification efficiency; while the heating surface of the semiconductor refrigeration chip 10 can be used to increase the ambient temperature within the gas detection unit 6, so that the ambient temperature within the gas detection unit 6 is greater than the temperature of the gas after dehumidification, making it impossible for the gas to release heat, and therefore the gas cannot condense or atomize within the gas detection unit 6. Through the above working method, not only the accuracy and reliability of the gas analyzer detection are guaranteed, but also the power consumption is reduced.

[0048] As another embodiment of the dehumidification structure 1 in the above scheme: See also Figure 9-11 In this embodiment, the air duct cavity 4 is square, and the two boxes in the dehumidification structure 1 are a third condensation water tank 13 and a heating chamber 14 which are symmetrically distributed up and down and arranged in the air duct cavity 4. The third condensation water tank 13 and the heating chamber 14 are symmetrically arranged in the square air duct cavity 4. The third condensation water tank 13 and the heating chamber 14 are both provided with an air inlet and an air outlet. The air outlet of the third condensation water tank 13 is installed with a U-shaped tube 19 connected to the air inlet of the heating chamber 14, and the air outlet of the heating chamber 14 is connected to the second air inlet 641 on the gas detection unit 6.

[0049] As a further description of the above scheme, the widths of the third condensation water tank 13 and the heating chamber 14 are adapted to the inner wall width of the air duct cavity 4, and the sum of the heights of the third condensation water tank 13 and the heating chamber 14 is adapted to the inner wall height of the air duct cavity 4, so as to facilitate the use of the joint action of the third condensation water tank 13 and the heating chamber 14 to separate the air duct cavity 4 into an uncondensed gas active part and a condensed gas active part, so as to prevent the uncondensed gas from flowing into the gas detection unit 6.

[0050] Specifically, the air inlet of the third condensation water tank 13 is connected to the first air guide port 41 of the air duct cavity 4. When the gas to be tested flows into the air duct cavity 4, it will enter the third condensation water tank 13 and be condensed and dehumidified in the third condensation water tank 13. It will then flow along the U-shaped tube 19 to the heating chamber 14. After the gas to be tested flows out of the heating chamber 14, it enters the gas detection unit 6. After dehumidification and temperature adjustment, the risk of condensation and atomization occurring again can be reduced.

[0051] See also Figure 9-11 A semiconductor refrigeration chip 10 is arranged between the third condensing water tank 13 and the heating chamber 14. The cooling surface of the semiconductor refrigeration chip 10 is attached to the third condensing water tank 13, and the heating surface of the semiconductor refrigeration chip 10 is attached to the heating chamber 14, so that the gas to be measured passes through the third condensing water tank 13 and the heating chamber 14 in sequence and then enters the gas detection unit 6.

[0052] As a further description of the above scheme, the semiconductor refrigeration chip 10 is arranged between the third condensation water tank 13 and the heating chamber 14. The cooling surface of the semiconductor refrigeration chip 10 can cool the third condensation water tank 13, thereby improving the condensation effect of the third condensation water tank 13 and enhancing its dehumidification efficiency, so as to effectively reduce the moisture content in the gas to be measured; and the heating surface of the semiconductor refrigeration chip 10 is convenient for heating the heating chamber 14, thereby further dehumidifying by increasing the temperature of the gas to be measured, effectively preventing the gas to be measured from condensing and atomizing and affecting gas detection.

[0053] See also Figure 6 A condensation structure 2 is provided in the condensation water tank, and the condensation structure 2 includes a baffle base 21, a first baffle 22 and a second baffle 23, wherein the baffle base 21 is connected to the condensation water tank along the length direction, and multiple first baffles 22 are connected to the baffle base 21 in parallel and at intervals, and multiple second baffles 23 are inserted in parallel and staggered between two adjacent first baffles 22. The top of the second baffle 23 is connected to the top wall of the condensation water tank, and the baffle base 21 is provided with a V-shaped groove 211 between the two adjacent first baffles 22, and a water inlet hole 212 is opened at the bottom of the V-shaped groove 211; when the gas contacts the outer walls of the first baffle 22 and the second baffle 23, the water molecules in the gas can release latent heat to produce condensation.

[0054] See also Figure 6 The condensation water tank and the condensation structure 2 are both made of metal material with a mirror surface; the heat conductivity of the metal material is conveniently utilized to improve the heat conduction effect during the condensation process, and the mirror properties are utilized to prevent the water droplets generated by condensation from being adsorbed on the inner wall of the condensation water tank and the surface of the condensation structure 2, so as to prevent the water droplets from coming into secondary contact with the gas, and effectively reduce the moisture content of the gas after condensation.

[0055] As a preferred embodiment of the present invention, a hydrophobic composite coating is plated inside the condensation structure 2 to increase the hydrophobicity of the condensation structure 2, so that the water droplets generated by condensation flow down quickly, and avoid the water droplets generated by condensation being adsorbed on the inner wall of the condensation water tank and the surface of the condensation structure 2.

[0056] See also Figure 6 A collecting tank 17 is provided on the bottom wall of the condensation water tank between the condensation water tank and the baffle base 21 to receive the condensation water flowing out through the water inlet hole 212. The bottom of the condensation water tank is connected to a drain pipe 24 that is connected to the bottom of the collecting tank 17, so that the condensation water collected in the collecting tank 17 can be discharged from the condensation water tank using the drain pipe 24.

[0057] Specifically, the high-humidity resistant gas detector also includes a water level monitor (not shown in the figure), which is installed in the collection tank 17. The water level monitor is used to monitor the water level in the collection tank 17 and is suitable for automatically starting drainage in cooperation with the pumping equipment after the water level monitor detects that the water level in the collection tank 17 reaches a set threshold.

[0058] See also Figure 1-8 The second valve component 32 is arranged at the second gas outlet of the gas detection unit 6 to keep the first valve component 31 and the second valve component 32 in a closed state when the gas detector is not working, so as to prevent high-humidity gas in the environment from entering.

[0059] As a preferred embodiment of the present invention, the first valve component 31 and the second valve component 32 are both one-way valves, and a spring structure is provided in the one-way valve to facilitate the negative pressure generated in the gas detection unit 6 when the fan 9 is running. When the negative pressure is greater than the elastic action of the spring structure, the one-way valve will open to allow the external gas to be tested to enter the gas detection unit 6, thereby realizing the function of opening the valve body when the fan 9 is running.

[0060] As another preferred embodiment of the present invention, the first valve component 31 and the second valve component 32 are electric valves 33, which are linked to the electric valves 33 by controlling the fan 9. The electric valves 33 include a stepping motor 331, a piston screw 332 and a push rod 333. Combined with the operating program in the control structure, the electric valves 33 can be opened when the fan 9 is running to allow the external gas to be tested to enter the gas detection unit 6, and the electric valves 33 can be closed when the fan 9 stops to prevent external air from entering.

[0061] It should be noted that the gas detection unit 6 is any one of a laser / infrared gas detection component, an electrochemical gas detection component and a semiconductor principle gas detection component. The gas detection unit 6 can be selected according to the specific application scenario; for example, in the indoor methane detection application of oil and gas wells, the gas detector using the laser principle to detect methane has the advantages of strong selectivity, fast response speed, high sensitivity and high precision.

[0062] See also Figure 1-2 In this embodiment, the gas detection unit 6 takes a laser gas detection component as an example. The gas detection unit 6 includes a gas chamber 64, a light emitting device 61, a reflective lens 62 and a light receiving device 63, wherein the light emitting device 61 is located in the gas chamber 64 and is used to emit a light beam, the reflective lens 62 is installed in the gas chamber 64 and is used to reflect the light beam, and the light receiving device 63 is installed in the gas chamber 64 and is used to receive the light beam.

[0063] As a further description of the above scheme, after the gas to be detected fills the gas chamber 64, the light emitting device 61 can be set to emit a light beam, which can be received by the light receiving device 63 after being reflected by the reflective lens 62. In the process of the light beam passing through the gas, the gas will absorb part of the light energy, causing the light beam intensity to attenuate. Therefore, after the light receiving device 63 receives the light beam, the gas concentration can be detected by analyzing the light beam attenuation signal.

[0064] See also Figure 1-4 The high-humidity resistant gas detector also includes a grille assembly 7, which includes an air inlet grille structure 71 and an air outlet grille structure 72. The air inlet grille structure 71 and the air outlet grille structure 72 are respectively installed at the first air inlet and the first air outlet of the outer shell 5. The air inlet grille structure 71 and the air outlet grille structure 72 are also provided with a filter component 8 for blocking water vapor and dust impurities in the gas to be measured.

[0065] As a preferred embodiment of the above scheme, the filter component 8 includes a waterproof and breathable membrane 81 and a filter mesh 82. The waterproof and breathable membrane 81 can use its own characteristics to intercept some water molecules in the air so as to reduce the content of water molecules in the air in the detector, while the filter mesh 82 can be used to block dust and impurities in the air to prevent dust and impurities from affecting gas detection.

[0066] As a further description of the above technical solution, a control component for implementing execution control is provided between the shell 51 and the air chamber 64. The control component is a microprocessor-type structure commonly used and well-known in the prior art, which is convenient for executing control of the fan 9 according to the operating procedures based on usage requirements, and real-time monitoring and recording of the detection data of the first temperature and humidity sensor 181 and the second temperature and humidity sensor 182.

[0067] The working process of the high humidity resistant gas detector and the gas laser detector in the above embodiment is as follows: When using the high-humidity resistant gas detector and gas laser detector, it is first necessary to control the operation of the fan 9 to open the first valve member 31 and the second valve member 32, thereby allowing external gas to enter the housing 51 through the air intake grille structure 71 and the filter component 8. During this process, the air intake grille structure 71 can cooperate with the waterproof and breathable membrane 81 and the filter screen 82 provided in the filter component 8 to filter the incoming gas, thereby reducing water vapor and impurities in the gas. After entering the shell 51, the gas can flow along the air duct cavity 4 and enter the condensation water tank. The condensation structure 2 provided in the condensation water tank can make the gas flow along the serpentine air path, thereby facilitating the increase of the gas flow path, so that the hot and humid air is condensed in the condensation structure 2, and the condensed water falls into the collection tank 17 at the bottom of the condensation water tank through the V-shaped groove 211 and the water guide hole 212 provided on the baffle base 21, thereby achieving dehumidification of the gas, effectively reducing the moisture content in the gas, and avoiding the generation of water mist or condensation during the detection process that affects the detection results; During the condensation process, the temperature and humidity measuring component 18 set up can detect the temperature and humidity of the gas before and after condensation and dehumidification. If the temperature and humidity of the gas to be measured after dehumidification in the condensation water tank reaches the preset temperature and humidity, the gas to be measured is directly allowed to enter the gas detection unit 6 for detection, and there is no need to worry about the risk of condensation of the gas to be measured inside the gas detection unit 6; if the temperature and humidity of the high-humidity gas to be measured does not reach the preset value after dehumidification in the condensation water tank, it is necessary to turn on the semiconductor refrigeration chip 10, so that the cooling surface of the semiconductor refrigeration chip 10 and the condensation water tank can cooperate to dehumidify, further enhance the condensation and dehumidification effect of the condensation water tank, reduce the moisture content in the gas, and make the heating surface of the semiconductor refrigeration chip 10 heat and dehumidify the condensed gas, thereby further reducing the possibility of condensation inside the gas detection unit 6.

[0068] Although the present invention is disclosed as above, the scope of protection disclosed by the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A high humidity resistant gas detector, characterized in that: include: A housing and an air duct cavity, a dehumidification unit, a control valve, a gas detection unit, and a pneumatic device arranged in the housing; The outer wall of the housing is provided with a first air inlet and a first air outlet for the inflow and outflow of the gas to be measured; The air duct cavity and the gas detection unit are both installed inside the housing, the air duct cavity is located on a side of the gas detection unit close to the first air inlet, the air duct cavity is provided with a first air guide port connected to the first air inlet, and the gas detection unit is provided with a second air inlet connected to the first air guide port and a second air outlet connected to the first air outlet; The dehumidification unit is arranged in the air duct cavity, and the dehumidification unit includes a dehumidification structure and a temperature and humidity measuring component for detecting the temperature and humidity of the gas to be measured before and after dehumidification by the dehumidification structure; The pneumatic device is used to drive the gas flow so that the external gas to be measured enters the housing and flows along the path of the air duct cavity, the dehumidification unit and the gas detection unit; The control valve includes a first valve component and a second valve component. The first valve component is installed at the first air guide port of the air duct cavity, and the second valve component is installed at the output end of the pneumatic device. The first valve component and the second valve component are suitable for automatically opening when the pneumatic device is working, so as to introduce the gas to be tested from the first air inlet into the dehumidification unit for dehumidification to a preset temperature and humidity, and then enter the gas detection unit for detection.

2. The high humidity resistant gas detector according to claim 1, characterized in that: The dehumidification structure includes two boxes and at least one semiconductor refrigeration chip, the boxes are condensation water tanks or heating chambers, and at least one of the two boxes is the condensation water tank. The semiconductor refrigeration chip includes a cooling surface and a heating surface. The cooling surface of at least one semiconductor refrigeration chip is attached to the condensation water tank, and the heating surface of at least one semiconductor refrigeration chip is used to heat and dehumidify the condensed gas. The temperature and humidity measurement component includes a first temperature and humidity sensor and a second temperature and humidity sensor. The first temperature and humidity sensor is installed at the air inlet of the condensation water tank to detect the temperature and humidity of the gas to be measured before dehumidification; the second temperature and humidity sensor is installed at the air outlet of the condensation water tank to detect the temperature and humidity of the gas to be measured before and after dehumidification.

3. The high humidity resistant gas detector according to claim 2, characterized in that: The two boxes are respectively a first condensation water tank and a second condensation water tank which are symmetrically distributed along the first air inlet of the shell and arranged on corresponding sides of the air duct cavity. The first condensation water tank and the second condensation water tank are both provided with a water tank air inlet and a water tank air outlet. The air duct cavity is also provided with a second air guide port corresponding to the position of the second air inlet.

4. The high humidity resistant gas detector according to claim 3, characterized in that: A semiconductor refrigeration chip is respectively provided between the first condensation water tank, the second condensation water tank and the gas detection unit. The cooling surfaces of the two semiconductor refrigeration chips are respectively attached to the first condensation water tank and the second condensation water tank, and the heating surfaces of the two semiconductor refrigeration chips are both attached to the gas detection unit.

5. The high humidity resistant gas detector according to claim 2, characterized in that: The two boxes are respectively a third condensation water tank and a heating chamber which are symmetrically distributed up and down along the first air inlet of the shell and arranged in the air duct cavity. The third condensation water tank and the heating chamber are both provided with an air inlet and an air outlet. The air outlet of the third condensation water tank is connected to the air inlet of the heating chamber, and the air outlet of the heating chamber is connected to the second air inlet on the gas detection unit.

6. The high humidity resistant gas detector according to claim 5, characterized in that: The semiconductor refrigeration chip is arranged between the third condensing water tank and the heating chamber. The cooling surface of the semiconductor refrigeration chip is attached to the third condensing water tank, and the heating surface of the semiconductor refrigeration chip is attached to the heating chamber, so that the gas to be measured passes through the third condensing water tank and the heating chamber in sequence and then enters the gas detection unit.

7. The high humidity resistant gas detector according to any one of claims 2 to 6, characterized in that: The condensation water tank is provided with a condensation structure, wherein: The condensation structure includes a baffle base connected to the condensation water tank along the length direction, a plurality of first baffles connected to the baffle base in parallel and at intervals, and a plurality of second baffles inserted in parallel and staggered between two adjacent first baffles. The top of the second baffle is connected to the top wall of the condensation water tank. The baffle base is provided with a V-shaped groove between two adjacent first baffles, and a water inlet hole is provided at the bottom of the V-shaped groove.

8. The high humidity resistant gas detector according to claim 7, characterized in that: A collecting trough is provided on the bottom wall of the condensing water tank between the condensing water tank and the baffle base to receive the condensing water flowing out through the water inlet hole. The bottom of the condensing water tank is connected to a drain pipe connected to the bottom of the collecting trough.

9. The high humidity resistant gas detector according to claim 8, characterized in that: Also includes: A water level monitor is installed in the collection tank. The water level monitor is used to monitor the water level in the collection tank, so as to automatically start drainage after the water level monitor detects that the water level in the collection tank reaches a set threshold.

10. The high humidity resistant gas detector according to claim 1, characterized in that: The first valve component and the second valve component are one-way valves, solenoid valves, check valves or electric valves; the pneumatic device is a fan or a pump.

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