A gas detector resistant to high humidity

Abstract

The application discloses a kind of anti high humidity gas detection instrument, it is related to gas detection technical field, the anti high humidity gas detection instrument includes shell and be arranged in shell air channel cavity, dehumidification unit, control valve, gas detection unit and pneumatic device;Shell is equipped with first air inlet and first air outlet, air channel cavity and gas detection unit are all installed in shell, and air channel cavity is located in the side of gas detection unit close to first air inlet.This anti high humidity gas detection instrument cooperates with condensate tank and semiconductor refrigeration chip in dehumidification structure to carry out cooperative dehumidification to high humidity gas to be measured, greatly reduce the possibility of atomization condensation phenomenon in gas detection unit, improve dehumidification efficiency, and through pneumatic device linkage control valve to make the gas to be measured reach preset temperature and humidity after dehumidification unit and enter gas detection unit detection, effectively improve gas concentration detection accuracy and reliability.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of gas detectors, in particular to a gas detector resistant to high humidity. BACKGROUND

[0002] A gas detector is a key device in the fields of environmental monitoring, industrial safety and disaster warning, and is widely used in high-humidity environments such as petroleum and chemical industry, mine operation and sewage treatment. Traditional gas detection technologies (such as spectral absorption technology, electrochemical sensors and semiconductor sensors) are easily disturbed by environmental humidity in actual applications (such as oil and gas well methane leakage detection, agricultural greenhouses and urban pipe networks). In particular, under the working condition of a relative humidity of more than 80%, the detection accuracy is significantly reduced, and even false alarms or failures occur, which seriously restricts the reliability of the device and the applicable scenarios. In a high-humidity environment, for spectral absorption gas sensors based on laser / infrared principles, when water vapor enters the interior of the sensor, water mist is formed on the surface of the optical lens, which can affect the light path of the sensor, so that the accuracy and reliability of the gas concentration cannot be guaranteed. In addition, the absorption peak of water vapor may overlap with the absorption peak of the target gas, thereby causing interference in detection. For electrochemical sensors, the entry of water vapor can dilute the electrolyte, thereby affecting the detection effect. For semiconductor sensors, water molecules can be adsorbed on the sensitive surface of the sensor, competing for reaction sites with the target gas, thereby reducing the sensitivity.

[0003] At present, the improvement methods for high-humidity environments include heating and dehumidification, physical isolation and algorithm compensation. For example, a China invention patent with the publication number CN220932767U discloses a fog-proof device, a light path detection module and a photochemical luminescence detector. The photochemical luminescence detector includes an incubation module and a light path detection module. The optical detection assembly includes a detection seat. The fog-proof device is installed on the detection seat. The optical lens is arranged in the fog-proof device. The fog-proof device includes a heating seat, a heating sheet and a compression ring. The heating sheet is used to heat the heating seat. The compression ring can be in adaptive contact with the convex surface of the optical lens, so as to tightly press the flat surface of the optical lens in the heating seat. The heating seat transmits heat to the optical lens by the heating of the heating sheet, so that the optical lens is uniformly heated. The optical lens does not fog due to temperature difference, and the service life of the optical lens is also prolonged. However, the fog-proofing realized by the fog-proof device in the above technical solution can increase the power consumption of the whole machine due to the large heating power.

[0004] Patent CN114609077A discloses a device for measuring gaseous methane in a sewage pipe network, which comprises 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 by the dehumidification chamber containing silica gel desiccant to ensure accurate measurement of methane. However, the drying structure used in the above technical solution has an absorption limit, which requires regular maintenance and replacement of the drying structure, resulting in high labor cost.

[0005] Patent CN119804372A discloses a high-humidity-resistant gas concentration detection method. By obtaining environmental temperature and humidity parameters, a multi-parameter data set is formed. Then, a compensation function is established based on the humidity parameter to dynamically correct the main channel data. The corrected main channel transmittance rate is calculated, and the humidity interference characteristic quantity is extracted. A compensation matrix is constructed by combining the temperature parameter to generate a feature parameter fused with environmental compensation. Finally, the concentration is converted by combining the environmental compensation parameter, and the final gas concentration value is output. This method effectively solves the interference problem of infrared gas detection in high temperature and high humidity environments, and is particularly suitable for continuous online monitoring in high temperature and high humidity conditions. However, this method corrects the detection signal by obtaining humidity data, but the adaptability of the compensation model cannot be guaranteed when the humidity changes dynamically, and the physical damage of the sensor caused by water vapor erosion cannot be solved.

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

[0007] Therefore, the purpose of the present application is to provide a high-humidity-resistant gas detector 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 purpose, the present application provides a high-humidity-resistant gas detector, which comprises a housing and a wind channel cavity, a dehumidification unit, a control valve, a gas detection unit and a pneumatic device arranged in the housing.

[0009] A first air inlet and a first air outlet are provided on the outer wall of the housing for the flow of the gas to be measured in and out.

[0010] The wind channel cavity and the gas detection unit are both installed inside the housing, and the wind channel cavity is located on the side of the gas detection unit close to the first air inlet. A first air guide opening is provided on the wind channel cavity and communicates with the first air inlet. A second air inlet and a second air outlet are provided on the gas detection unit and communicate with the first air guide opening and the first air outlet, respectively.

[0011] The dehumidification unit comprises a dehumidification structure and a temperature and humidity measuring assembly for detecting the temperature and humidity of the gas to be measured before and after dehumidification by the dehumidification structure.

[0012] The pneumatic device is used to drive the flow of gas to make the external gas to be measured enter the shell and flow along the path of the air duct cavity, the dehumidification unit and the gas detection unit.

[0013] The control valve comprises a first valve and a second valve, the first valve is installed at the first air guide port of the air duct cavity, and the second valve is installed at the output end of the pneumatic device, and the first valve and the second valve are adapted to be automatically opened when the pneumatic device works to introduce the gas to be measured from the first air inlet into the dehumidification unit to be dehumidified to a preset temperature and humidity and then into the gas detection unit for detection.

[0014] Further, the preset temperature and humidity is determined according to the dew point temperature and relative humidity inside the gas detection unit.

[0015] Further, the dehumidification structure comprises two boxes and at least one semiconductor refrigeration chip, the boxes are condensate water boxes or heating cavities, and at least one of the two boxes is a condensate water box, the semiconductor refrigeration chip comprises a refrigeration surface and a heating surface, the refrigeration surface of at least one semiconductor refrigeration chip is attached to at least one condensate water box, and the heating surface of at least one semiconductor refrigeration chip is used to heat and dehumidify the condensed gas.

[0016] The temperature and humidity measuring assembly comprises 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 condensate water box to detect the temperature and humidity of the gas to be measured before dehumidification, and the second temperature and humidity sensor is installed at the air outlet of the condensate water box to detect the temperature and humidity of the gas to be measured before and after dehumidification.

[0017] Further, the two boxes are respectively a first condensate water box and a second condensate water box which are symmetrically distributed along the first air inlet of the shell and arranged at the corresponding sides of the air duct cavity, the first condensate water box and the second condensate water box 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.

[0018] Further, one semiconductor refrigeration chip is arranged between the first condensate water box and the second condensate water box and the gas detection unit, the refrigeration surfaces of the two semiconductor refrigeration chips are respectively attached to the first condensate water box and the second condensate water box, and the heating surfaces of the two semiconductor refrigeration chips are both attached to the gas detection unit.

[0019] Further, the two boxes are respectively a third condensate water tank and a heating chamber symmetrically distributed along the first air inlet of the shell and arranged in the air duct cavity, the third condensate water tank and the heating chamber are both provided with an air inlet and an air outlet, the air outlet of the third condensate water tank is communicated with the air inlet of the heating chamber, and the air outlet of the heating chamber is communicated with the second air inlet on the gas detection unit.

[0020] Further, the third condensate water tank and the heating chamber are provided with the semiconductor refrigeration chip, the refrigeration surface of the semiconductor refrigeration chip is attached to the third condensate water tank, and the heating surface of the semiconductor refrigeration chip is attached to the heating chamber, so that the to-be-detected gas enters the gas detection unit after sequentially passing through the third condensate water tank and the heating chamber.

[0021] Further, the condensate water tank is provided with a condensation structure, wherein:

[0022] The condensation structure comprises a baffle base connected in the length direction in the condensate water tank, a plurality of first baffles connected in parallel and spaced apart on the baffle base, and a plurality of second baffles inserted in parallel and staggered between adjacent two first baffles, the top end of the second baffle is connected to the top wall of the condensate water tank, and a V-shaped groove is arranged between adjacent two first baffles of the baffle base, and a water guide hole is arranged at the bottom of the V-shaped groove.

[0023] Further, the condensate water tank and the condensation structure are both made of metal material with a surface mirror surface; and / or

[0024] The condensation structure is coated with a hydrophobic composite coating.

[0025] Further, a collection groove is arranged on the bottom wall of the condensate water tank between the condensate water tank and the baffle base to collect the condensed water flowing out of the water guide hole, and a drain pipe is connected to the bottom of the collection groove.

[0026] Further, the anti-high-humidity gas detector further comprises:

[0027] A water level monitor is installed in the collection groove, and the water level monitor is used to monitor the water level in the collection groove, so as to automatically open the drain when the water level in the collection groove reaches a set threshold.

[0028] Further, the second valve is arranged at the second air outlet of the gas detection unit to prevent high-humidity gas in the environment from entering the gas detection unit from the second air outlet.

[0029] Further, the control valve is a one-way valve, an electromagnetic valve, a check valve or an electric valve.

[0030] Further, the pneumatic device is a fan or a pump.

[0031] Further, the gas detection unit is any one of an optical gas detection component, an electrochemical gas detection component and a gas detection component based on semiconductor principle.

[0032] Further, the gas detection unit is a laser gas detection unit, comprising a gas chamber, a light emitting device arranged in the gas chamber and configured to emit a light beam, a mirror arranged in the gas chamber and configured to reflect the light beam, and a light receiving device arranged in the gas chamber and configured to receive the light beam.

[0033] Further, the anti-high-humidity gas detector further comprises:

[0034] The grille assembly comprises an air inlet grille structure and an air outlet grille structure arranged at the first air inlet and the first air outlet of the shell respectively, and the air inlet grille structure and the air outlet grille structure are further provided with filter components for filtering water vapor and dust impurities in the to-be-detected gas.

[0035] In summary, due to the adoption of the above technical solutions, the present application has the following advantages:

[0036] 1. The anti-high-humidity gas detector synchronously opens the first valve and the second valve in the pneumatic device and the control valve when gas detection is needed, so as to introduce the to-be-detected gas into the dehumidification unit of the air duct cavity, and after the temperature and humidity measurement assembly detects that the to-be-detected gas is dehumidified to a preset temperature and humidity, the to-be-detected gas enters the gas detection unit for detection, so as to effectively prevent the to-be-detected gas from condensing fog or dew during the detection process, and effectively improve the accuracy and reliability of the detection result.

[0037] In addition, during the dehumidification process, the dehumidification structure in the dehumidification unit can realize dehumidification treatment of the high-humidity to-be-detected gas, the air duct formed by the multiple baffles in the condensate tank of the dehumidification structure can prolong the gas path of the high-humidity to-be-detected gas flow, improve the dehumidification effect, and the refrigeration surface of the semiconductor refrigeration chip in the dehumidification structure is arranged on the condensate tank, which can enhance the condensation effect, and the heating surface of the semiconductor refrigeration chip can further heat and dehumidify the to-be-detected gas after condensation, so as to effectively improve the dehumidification efficiency of the dehumidification structure.

[0038] 2、The anti-high-humidity gas detector detects the temperature and humidity of the high-humidity gas to be measured before and after dehumidification by respectively arranging temperature and humidity sensors at the gas inlet and outlet of the condensate tank, compares the temperature and humidity of the dehumidified gas to be measured with the preset temperature and humidity, and when the temperature and humidity of the dehumidified gas to be measured reaches the preset temperature and humidity, the gas to be measured entering the gas detection unit will not condense and can directly enter the gas detection unit for detection; when the temperature of the dehumidified gas to be measured does not reach the preset temperature and humidity, the semiconductor refrigeration chip is started to work in cooperation with the condensate tank to dehumidify to reach the preset temperature and humidity, so that the detection accuracy and reliability of the gas detector are ensured, and the power consumption is reduced.

[0039] 3、The anti-high-humidity gas detector installs a first control valve at the first air guide inlet of the air duct cavity, installs a second control valve at the output end of the pneumatic device, and the first control valve and the second control valve are linked with the pneumatic device, and the two valves are automatically opened when the pneumatic device works, so as to introduce the gas to be measured into the gas detector for dehumidification and detection; when the pneumatic device does not work, the two valves play a protective role for the gas detector to prevent high-humidity gas in the environment from invading the gas detector to form water. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 It is the main view structural schematic diagram of the anti-high-humidity gas detector in the embodiment one of the application after removing the cover plate;

[0041] Figure 2 It is the main view structural schematic diagram of the anti-high-humidity gas detector in the embodiment one of the application after removing the cover plate; Figure 1

[0042] Figure 3 It is the main view structural schematic diagram of the anti-high-humidity gas detector in the embodiment one of the application after removing the cover plate;

[0043] Figure 4 It is the main view structural schematic diagram of the anti-high-humidity gas detector in the embodiment one of the application after removing the cover plate;

[0044] Figure 5 It is the main view structural schematic diagram of the anti-high-humidity gas detector in the embodiment one of the application after removing the cover plate;

[0045] Figure 6 It is the main view structural schematic diagram of the anti-high-humidity gas detector in the embodiment one of the application after removing the cover plate;

[0046] Figure 7 It is the main view structural schematic diagram of the anti-high-humidity gas detector in the embodiment one of the application after removing the cover plate;

[0047] Figure 8 ​Fig. 1 is a schematic view of a transverse sectional structure of an electric valve of a gas detector with high humidity resistance according to an embodiment of the present application;

[0048] Figure 9 Fig. 2 is a schematic view of a partial main sectional structure of a gas detector with high humidity resistance according to an embodiment of the present application;

[0049] Figure 10 Fig. 3 is a schematic view of a perspective structure of a third condensate tank and a heating chamber of a gas detector with high humidity resistance according to an embodiment of the present application;

[0050] Figure 11 Fig. 4 is a schematic view of a transverse sectional structure of a third condensate tank and a heating chamber of a gas detector with high humidity resistance according to an embodiment of the present application.

[0051] Legend of reference signs:

[0052] 1 - dehumidification structure;

[0053] 11 - first condensate tank; 12 - second condensate tank; 13 - third condensate tank; 14 - heating chamber; 15 - water tank air inlet; 16 - water tank air outlet; 17 - collection groove; 18 - temperature and humidity measurement assembly; 181 - first temperature and humidity sensor; 182 - second temperature and humidity sensor; 19 - U-shaped tube;

[0054] 2 - condensation structure;

[0055] 21 - baffle base; 211 - V-shaped groove; 212 - water guide hole; 22 - first baffle; 23 - second baffle; 24 - drain pipe;

[0056] 3 - control valve;

[0057] 31 - first valve; 32 - second valve; 33 - electric valve; 331 - stepper motor; 332 - piston screw; 333 - push rod;

[0058] 4 - air duct cavity;

[0059] 41 - first air guide; 42 - second air guide;

[0060] 5 - shell;

[0061] 51 - shell; 52 - cover plate;

[0062] 6 - gas detection unit;

[0063] 61 - light emitting device; 62 - reflecting lens; 63 - light receiving device; 64 - air chamber; 641 - second air inlet;

[0064] 7 - grid assembly;

[0065] 71 - air inlet grid structure; 72 - air outlet grid structure;

[0066] 8 - filter component;

[0067] 81 - waterproof and breathable membrane; 82 - filter screen;

[0068] 9 - fan;

[0069] 10 - semiconductor refrigeration chip. DETAILED DESCRIPTION

[0070] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0071] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0072] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0073] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is usually placed, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0074] In the description of the present application, it is also necessary to explain that, unless otherwise explicitly specified and limited, the terms "set", "install", "connect", "connect" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0075] Please refer to Figures 1-11 The anti-high-humidity gas detector provided by the embodiment comprises a shell 5, a wind channel cavity 4, a dehumidification unit, a control valve 3, a gas detection unit 6 and a pneumatic device arranged in the shell 5. The pneumatic device can be a fan 9 or a pump, which is a device for making the ambient airflow enter the gas detector. In the embodiment, the pneumatic device is exemplified by the fan 9.

[0076] The first air inlet and the first air outlet are arranged on the outer wall of the shell 5, so as to make the to-be-detected gas flow in and out. The wind channel cavity 4 and the gas detection unit 6 are both installed in the shell 5. The wind channel cavity 4 is located on the side of the gas detection unit 6 close to the first air inlet. A first air guide hole 41 is arranged on the wind channel cavity 4, which is in communication with the first air inlet, so as to make the external to-be-detected gas enter the wind channel cavity 4 and move along the wind channel cavity 4.

[0077] A second air inlet 641 in communication with the wind channel cavity 4 and a second air outlet corresponding to the input end position of the fan 9 are arranged on the gas detection unit 6. The gas flowing through the wind channel cavity 4 can enter the gas detection unit 6 through the second air inlet 641 for detection, and the detected gas can be extracted by the fan 9 through the second air outlet.

[0078] The dehumidification unit is arranged in the wind channel cavity 4. The dehumidification unit comprises a dehumidification structure 1 and a temperature and humidity measurement assembly 18. The dehumidification structure 1 is used for dehumidifying the to-be-detected gas. The temperature and humidity measurement assembly 18 is used for detecting the temperature and humidity of the to-be-detected gas before and after dehumidification. The control valve 3 comprises a first valve 31 and a second valve 32. The first valve 31 is installed at the first air guide hole 41 of the wind channel cavity 4. The second valve 32 is installed at the output end of the fan 9. The first valve 31 and the second valve 32 are adapted to be automatically opened when the fan 9 works, so as to introduce the to-be-detected gas from the first air inlet into the dehumidification unit, dehumidify the to-be-detected gas to a preset temperature and humidity, and then introduce the to-be-detected gas into the gas detection unit 6 for detection.

[0079] As further described above, the shell 5 comprises a housing 51 and a cover plate 52, the housing 51 is used to accommodate the air duct cavity 4, the dehumidification unit, the first valve 31, the gas detection unit 6 and the fan 9, and one side of the housing 51 is provided with an opening for maintenance and repair of the inside of the housing 51, and the opening side of the housing 51 is detachably connected with the cover plate 52 to close the opening of the housing 51 and protect the internal structure of the housing 51 during use.

[0080] Please refer to Figures 1-5 and Figures 9-11 , the dehumidification structure 1 comprises two boxes and at least one semiconductor refrigeration chip 10, the boxes are condensate water tanks or heating chambers 14, and at least one of the two boxes is a condensate water tank, the semiconductor refrigeration chip 10 comprises a refrigeration surface and a heating surface, and the refrigeration surface of at least one semiconductor refrigeration chip 10 is attached to the condensate water tank, and the heating surface of at least one semiconductor refrigeration chip 10 is used to heat and dehumidify the condensed gas.

[0081] The temperature and humidity measurement assembly 18 comprises a first temperature and humidity sensor 181 and a second temperature and humidity sensor 182, and 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 condensate water tank to detect the temperature and humidity of the gas to be measured before and after entering the condensate water tank for condensation.

[0082] As further described above, 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 measurement assembly 18, if the high-humidity gas to be measured is dehumidified by the condensate water tank, when the temperature and humidity of the gas to be measured detected by the second temperature and humidity sensor 182 reaches the preset temperature and humidity (the preset value is determined according to the dew point temperature and the 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 in the gas detection unit 6;

[0083] If the temperature and humidity of the 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 condensate water tank, it indicates that the humidity of the gas to be measured is still high and the dehumidification is not complete, at this time, the semiconductor refrigeration chip 10 is started to work to cooperate with the condensate water tank for dehumidification, since the refrigeration surface of the semiconductor refrigeration chip 10 is attached to the condensate water tank, the condensation effect of the condensate water tank is greatly enhanced; thereby achieving the purpose of improving the condensation efficiency of the gas to be measured by the combined action of the condensate water tank and the refrigeration surface of the semiconductor refrigeration chip 10, 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 in the gas detection unit 6.

[0084] As an embodiment of the dehumidification structure 1 in the above technical solution:

[0085] Please refer to Figures 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 the first condensate water tank 11 and the second condensate water tank 12, which are symmetrically distributed and arranged in the corresponding sides of the air duct cavity 4. The first condensate water tank 11 and the second condensate water tank 12 are both provided with a water tank air inlet 15 and a water tank air outlet 16, and 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 to-be-tested gas 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.

[0086] As a further description of the above solution, the outer walls of the first condensate water tank 11 and the second condensate water tank 12 are both adapted to the size of the inner wall of the air duct cavity 4, which is convenient for separating the transverse section of the air duct cavity 4 into an uncondensed gas active part and a condensed gas active part by using the first condensate water tank 11 or the second condensate water tank 12 arranged, so as to prevent the uncondensed gas from flowing to the second air inlet 641.

[0087] Specifically, when the to-be-tested gas flows through the air duct cavity 4, the to-be-tested gas in the air duct cavity 4 can be condensed by the first condensate water tank 11 and the second condensate water tank 12 arranged, and the moisture of the condensed to-be-tested gas is reduced, which can achieve the effect of dehumidification and reduce the possibility of condensation in the gas detection unit 6.

[0088] Please refer to Figures 1-2 , between the first condensate water tank 11 and the second condensate water tank 12 and the gas detection unit 6, there is a semiconductor refrigeration chip 10, the refrigeration faces of the two semiconductor refrigeration chips 10 are respectively attached to the first condensate water tank 11 and the second condensate water tank 12, and the heating faces of the two semiconductor refrigeration chips 10 are both attached to the gas detection unit 6.

[0089] As a further description of the above solution, the refrigeration faces of the two semiconductor refrigeration chips 10 can respectively cool the first condensate water tank 11 and the second condensate water tank 12, thereby achieving the effect of improving the condensation effect of the first condensate water tank 11 and the second condensate water tank 12, so as to reduce the moisture in the gas flowing through the first condensate water tank 11 or the second condensate water tank 12, thereby effectively improving the dehumidification efficiency; and the heating face of the semiconductor refrigeration chip 10 can be used to improve the ambient temperature in the gas detection unit 6, so that the ambient temperature in the gas detection unit 6 is greater than the temperature of the gas after dehumidification, so that the gas cannot be cooled, and therefore the gas cannot be condensed or atomized in the gas detection unit 6. Through the above working mode, not only the accuracy and reliability of the gas analyzer detection are ensured, but also the power consumption is reduced.

[0090] As another embodiment of the dehumidification structure 1 in the above-mentioned solution:

[0091] Referring to Figures 9-11 In this embodiment, the air duct cavity 4 is square, and the two boxes in the dehumidification structure 1 are a third condensate water tank 13 and a heating chamber 14 symmetrically arranged in the air duct cavity 4, and the third condensate water tank 13 and the heating chamber 14 are symmetrically arranged in the square air duct cavity 4. The third condensate 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 condensate water tank 13 is provided with a U-shaped pipe 19 in communication with the air inlet of the heating chamber 14, and the air outlet of the heating chamber 14 is in communication with the second air inlet 641 on the gas detection unit 6.

[0092] As a further description of the above-mentioned solution, the width of the third condensate water tank 13 and the heating chamber 14 is adapted to the width of the inner wall of the air duct cavity 4, and the sum of the heights of the third condensate water tank 13 and the heating chamber 14 is adapted to the height of the inner wall of the air duct cavity 4, so that the air duct cavity 4 is conveniently divided into an uncondensed gas active part and a condensed gas active part by the combined action of the third condensate water tank 13 and the heating chamber 14, so as to prevent the uncondensed gas from flowing into the gas detection unit 6.

[0093] Specifically, the air inlet of the third condensate water tank 13 is in communication with the first air guide port 41 of the air duct cavity 4, when the to-be-tested gas flows into the air duct cavity 4, it will enter the third condensate water tank 13 and be condensed and dehumidified therein, and then flow along the U-shaped pipe 19 to the heating chamber 14, and after the to-be-tested gas flows out of the heating chamber 14, it enters the gas detection unit 6, and the gas after dehumidification and temperature adjustment can reduce the risk of re-condensation and atomization.

[0094] Referring to Figures 9-11 , a semiconductor refrigeration chip 10 is arranged between the third condensate water tank 13 and the heating chamber 14, the refrigeration surface of the semiconductor refrigeration chip 10 is attached to the third condensate water tank 13, and the heating surface of the semiconductor refrigeration chip 10 is attached to the heating chamber 14, so that the to-be-tested gas enters the gas detection unit 6 after passing through the third condensate water tank 13 and the heating chamber 14 in turn.

[0095] As a further description of the above-mentioned solution, the semiconductor refrigeration chip 10 is arranged between the third condensate water tank 13 and the heating chamber 14, the refrigeration surface of the semiconductor refrigeration chip 10 can cool the third condensate water tank 13, thereby improving the condensation effect of the third condensate water tank 13 and enhancing its dehumidification efficiency, so as to effectively reduce the water content in the to-be-tested gas; and the heating surface of the semiconductor refrigeration chip 10 is convenient for heating the heating chamber 14, thereby further dehumidifying the to-be-tested gas by increasing the temperature of the to-be-tested gas, effectively preventing the to-be-tested gas from being affected by condensation atomization.

[0096] Referring to Figure 6The condensing water tank is provided with a condensing structure 2, the condensing structure 2 comprises a baffle base 21, a first baffle 22 and a second baffle 23, wherein the baffle base 21 is connected in the length direction in the condensing water tank, a plurality of first baffles 22 are connected in parallel and at intervals on the baffle base 21, a plurality of second baffles 23 are inserted in parallel and staggered between adjacent two first baffles 22, the top end of the second baffle 23 is connected to the top wall of the condensing water tank, and the baffle base 21 is provided with a V-shaped groove 211 between adjacent two first baffles 22, and a water guide hole 212 is formed in the bottom of the V-shaped groove 211; when the gas contacts the outer wall of the first baffle 22 and the second baffle 23, the water molecules in the gas can release latent heat to generate condensation.

[0097] Please refer to Figure 6 The condensing water tank and the condensing structure 2 are both made of metal materials with a mirror surface; the heat conduction effect in the condensation process is improved by utilizing the heat conduction of the metal material, and the water droplets generated by condensation are prevented from being adsorbed on the inner wall of the condensing water tank and the surface of the condensing structure 2 by utilizing the mirror surface characteristics, so that the water droplets and the gas are prevented from being in secondary contact, and the water content after the gas is condensed is effectively reduced.

[0098] As a preferred scheme of the present application, a hydrophobic composite coating is plated in the condensing structure 2, so as to increase the hydrophobicity of the condensing structure 2, make the water droplets generated by condensation flow down quickly, and avoid the water droplets generated by condensation from being adsorbed on the inner wall of the condensing water tank and the surface of the condensing structure 2.

[0099] Please refer to Figure 6 A collection groove 17 is formed between the condensing water tank and the baffle base 21 and located on the bottom wall of the condensing water tank, so as to receive the condensed water flowing out through the water guide hole 212, and a drain pipe 24 is connected to the bottom of the collection groove 17, so as to facilitate the discharge of the condensed water collected in the collection groove 17 out of the condensing water tank by the drain pipe 24.

[0100] Specifically, the anti-high-humidity gas detector further comprises a water level monitor (not shown in the figure), which is installed in the collection groove 17 and is used to monitor the water level in the collection groove 17, and is adapted to automatically open the drain when the water level monitor detects that the water level in the collection groove 17 reaches a set threshold.

[0101] Please refer to Figures 1-8 The second valve 32 is arranged at the second gas outlet of the gas detection unit 6, so as to make the first valve 31 and the second valve 32 in a closed state when the gas detector is not working, and prevent the high-humidity gas in the environment from entering.

[0102] As a preferred scheme of the present application, the first valve 31 and the second valve 32 are both one-way valves, and a spring structure is arranged in the one-way valve, so as to facilitate the generation of negative pressure in the gas detection unit 6 when the fan 9 is running. When the negative pressure is greater than the elastic force of the spring structure, the one-way valve is opened to allow the external gas to be detected into the gas detection unit 6, thereby realizing the opening of the valve body when the fan 9 is running.

[0103] As another preferred scheme of the present application, the first valve 31 and the second valve 32 are electrically operated gas valves 33. The electrically operated gas valves 33 are linked with the fan 9 and are controlled by a control structure. The electrically operated gas valves 33 include a stepping motor 331, a piston screw 332 and a push rod 333. The electrically operated gas valves 33 are opened when the fan 9 is running to allow the external gas to be detected into the gas detection unit 6, and the electrically operated gas valves 33 are closed when the fan 9 is stopped to prevent the external air from entering.

[0104] 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, and the gas detection unit 6 can be selected according to the specific application scene. For example, in the indoor methane detection application of an oil and gas well, the laser principle gas detector has the advantages of strong selectivity, fast response speed, high sensitivity and high precision in detecting methane.

[0105] Referring to Figures 1-2 In the embodiment, the gas detection unit 6 takes a laser gas detection component as an example. The gas detection unit 6 includes a gas cavity 64, a light emitting device 61, a reflecting mirror 62 and a light receiving device 63. The light emitting device 61 is located in the gas cavity 64 and is used to emit a light beam. The reflecting mirror 62 is installed in the gas cavity 64 and is used to reflect the light beam. The light receiving device 63 is installed in the gas cavity 64 and is used to receive the light beam.

[0106] As a further description of the above scheme, after the gas to be detected fills the gas cavity 64, the light emitting device 61 arranged can emit a light beam. The light beam emitted can be reflected by the reflecting mirror 62 and then received by the light receiving device 63. In the process of the light beam passing through the gas, the gas can absorb part of the light energy, resulting in the attenuation of the light beam intensity. Therefore, the concentration of the gas can be detected by analyzing the light beam attenuation signal after the light receiving device 63 receives the light beam.

[0107] Referring to Figures 1-4 The anti-high-humidity gas detector further includes a grid assembly 7. The grid assembly 7 includes an air inlet grid structure 71 and an air outlet grid structure 72. The air inlet grid structure 71 and the air outlet grid structure 72 are respectively installed at the first air inlet and the first air outlet of the shell 5. The air inlet grid structure 71 and the air outlet grid structure 72 are further provided with a filter component 8 for blocking water vapor and dust impurities in the gas to be detected.

[0108] As the preferred solution of the above-mentioned technical scheme, the filtering component 8 comprises a waterproof and breathable film 81 and a filter screen 82, the waterproof and breathable film 81 can intercept part of the water molecules in the air by its own characteristics, so as to reduce the content of water molecules in the air in the detector, and the filter screen 82 is arranged to block dust and impurities in the air, so as to avoid the influence of dust and impurities on gas detection.

[0109] As a further description of the above technical scheme, the control assembly for realizing the execution control is arranged between the shell 51 and the air chamber 64, the control assembly is a microprocessor structure commonly used and known in the prior art, which facilitates the execution control of the fan 9 according to the operation program according to the use requirement, and real-time monitoring and recording of the detection data of the first and second temperature and humidity sensors 181 and 182.

[0110] The working process of the anti-high-humidity gas detector and the gas laser detector in the above embodiment is as follows:

[0111] In use of the anti-high-humidity gas detector and the gas laser detector, the fan 9 needs to be controlled to operate first, so that the first valve 31 and the second valve 32 are opened, so that the external gas enters the shell 51 through the air inlet grille structure 71 and the filtering component 8, in which process the air inlet grille structure 71 can cooperate with the waterproof and breathable film 81 and the filter screen 82 arranged in the filtering component 8 to filter the entering gas, reducing the water vapor and impurities in the gas;

[0112] The gas entering the shell 51 can flow along the air duct cavity 4 and enter the condensate tank, the condensing structure 2 arranged in the condensate tank can make the gas flow along the serpentine air path, so as to facilitate the increase of the gas flow path, so that the humid hot air is condensed in the condensing structure 2, and the condensate water falls into the collection groove 17 at the bottom of the condensate tank through the V-shaped groove 211 and the water guide hole 212 arranged on the baffle base 21, so as to realize the dehumidification treatment of the gas, effectively reduce the water content in the gas, and avoid the influence of water mist or condensation phenomenon on the detection result in the detection process;

[0113] In the condensation process, the temperature and humidity measuring assembly 18 arranged can detect the temperature and humidity of the gas before and after the condensation and dehumidification. If the temperature and humidity of the to-be-detected gas after the dehumidification by the condensation water tank reaches the preset temperature and humidity, the to-be-detected gas directly enters the gas detection unit 6 for detection, without worrying about the condensation risk of the to-be-detected gas in the gas detection unit 6. If the temperature and humidity of the high-humidity to-be-detected gas after the dehumidification by the condensation water tank does not reach the preset value, the semiconductor refrigeration chip 10 needs to be started, so that the refrigeration surface of the semiconductor refrigeration chip 10 and the condensation water tank cooperatively dehumidify, further strengthen the condensation and dehumidification effect of the condensation water tank, reduce the water content in the gas, and make the heating surface of the semiconductor refrigeration chip 10 heat and dehumidify the gas after the condensation, and again reduce the possibility of condensation in the gas detection unit 6.

[0114] Although the present application is disclosed as above, the protection scope of the present application is not limited to this. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, and these changes and modifications shall fall within the protection scope of the present application.

Claims

1. A gas detector resistant to high humidity, characterized in that, include: The housing, and the air duct cavity, dehumidification unit, control valve, gas detection unit and pneumatic device disposed within the housing; The outer wall of the housing is provided with a first air inlet and a first air outlet for the gas to be tested to flow in and out. Both the air duct cavity and the gas detection unit are installed inside the housing. The air duct cavity is located on the side of the gas detection unit near the first air inlet. The air duct cavity has a first air guide port that communicates with the first air inlet. The gas detection unit has a second air inlet that communicates with the first air guide port and a second air outlet that communicates with the first air outlet. The dehumidification unit is disposed in the air duct cavity. 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 dehumidification structure includes two housings and at least one semiconductor cooling chip. The two housings are a first condensate tank and a second condensate tank, symmetrically distributed along the first air inlet of the outer shell and located on corresponding sides of the air duct cavity. The outer walls of the first condensate tank and the second condensate tank are adapted to the inner wall dimensions of the air duct cavity. Each of the first condensate tank and the second condensate tank is provided with a semiconductor cooling chip between itself and the gas detection unit. The cooling surfaces of the two semiconductor cooling chips are respectively attached to the first condensate tank and the second condensate tank, and the heating surfaces of the two semiconductor cooling chips are attached to the gas detection unit. The first condensate tank and the second condensate tank are each provided with a tank air inlet and a 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. 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 condensate tank and is used to detect the temperature and humidity of the gas to be tested before dehumidification. The second temperature and humidity sensor is installed at the air outlet of the condensate tank and is used to detect the temperature and humidity of the gas to be tested before and after dehumidification. The pneumatic device is used to drive the gas flow so that the external gas to be tested 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 and a second valve. The first valve is installed at the first air inlet of the air duct cavity, and the second valve is installed at the output end of the pneumatic device. The first valve and the second valve are adapted to open automatically 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 before entering the gas detection unit for detection.

2. A gas detector resistant to high humidity, characterized in that, include: The housing, and the air duct cavity, dehumidification unit, control valve, gas detection unit and pneumatic device disposed within the housing; The outer wall of the housing is provided with a first air inlet and a first air outlet for the gas to be tested to flow in and out. Both the air duct cavity and the gas detection unit are installed inside the housing. The air duct cavity is located on the side of the gas detection unit near the first air inlet. The air duct cavity has a first air guide port that communicates with the first air inlet. The gas detection unit has a second air inlet that communicates with the first air guide port and a second air outlet that communicates with the first air outlet. The dehumidification unit is disposed in the air duct cavity. 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 dehumidification structure includes two housings and at least one semiconductor cooling chip. The two housings are a third condensate tank and a heating chamber, symmetrically distributed vertically along the first air inlet of the outer shell and located within the air duct cavity. Both the third condensate tank and the heating chamber have air inlets and outlets. The outlet of the third condensate tank communicates with the air inlet of the heating chamber, and the outlet of the heating chamber communicates with the second air inlet on the gas detection unit. The widths of both the third condensate tank and the heating chamber are adapted to the width of the inner wall of the air duct cavity, and the sum of their heights is adapted to the height of the inner wall of the air duct cavity. A second air guide port corresponding to the position of the second air inlet is also provided in the air duct cavity. 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 condensate tank and is used to detect the temperature and humidity of the gas to be tested before dehumidification. The second temperature and humidity sensor is installed at the air outlet of the condensate tank and is used to detect the temperature and humidity of the gas to be tested before and after dehumidification. The pneumatic device is used to drive the gas flow so that the external gas to be tested 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 and a second valve. The first valve is installed at the first air inlet of the air duct cavity, and the second valve is installed at the output end of the pneumatic device. The first valve and the second valve are adapted to open automatically 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 before entering the gas detection unit for detection.

3. The high humidity resistant gas detector according to claim 2, characterized in that, The semiconductor refrigeration chip is disposed between the third condensate tank and the heating chamber. The cooling surface of the semiconductor refrigeration chip is attached to the third condensate tank, and the heating surface of the semiconductor refrigeration chip is attached to the heating chamber, so that the gas to be tested enters the gas detection unit after passing through the third condensate tank and the heating chamber in sequence.

4. The high humidity resistant gas detector according to any one of claims 1-2, characterized in that, The condensate tank is equipped with a condensation structure, wherein: The condensation structure includes a baffle base connected along the length of the condensate tank, a plurality of first baffles connected in parallel at intervals to the baffle base, 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 condensate 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.

5. The high humidity resistant gas detector according to claim 4, characterized in that, A collection trough is provided on the bottom wall of the condensate tank between the condensate tank and the baffle base to collect the condensate flowing out through the water inlet. A drain pipe connected to the bottom of the collection trough is provided at the bottom of the condensate tank.

6. The high humidity resistant gas detector according to claim 5, characterized in that, Also includes: A water level monitor is installed in the collection tank to monitor the water level in the collection tank, and is adapted to automatically start drainage after the water level in the collection tank is detected by the water level monitor to reach a set threshold.

7. The high humidity resistant gas detector according to any one of claims 1-2, characterized in that, The first valve and the second valve are one-way valves, solenoid valves, check valves, or electric valves; the pneumatic device is a fan or a pump.

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