Automatic gas component analysis sensor

Abstract

The invention provides an automatic gas component analysis inductor, and belongs to the technical field of gas detection equipment, the automatic gas component analysis inductor mainly comprises a plurality of gas sensors, and further comprises a gas storage cylinder and a gas suction assembly, the gas suction assembly sucks gas in a space to be detected into the gas storage cylinder; the probe end of the gas sensor is mounted in the gas storage cylinder, so that when the pressure intensity in the gas storage cylinder reaches a set value, the gas sensor is used for collecting gas component information in the gas storage cylinder at the moment; the device further comprises a component calculation module, and the component calculation module calculates the component content of external gas according to the air pressure ratio of the air storage cylinder to the space to be detected. The automatic gas component analysis sensor can accurately and quickly detect trace gas components, and is good in economical efficiency.

Description

Technical Field

[0001] This invention belongs to the technical field of gas detection equipment, and more specifically, it is an automatic gas composition analysis sensor. Background Technology

[0002] In industrial production workshops, laboratories, and indoor living environments, it is necessary to determine the content of certain gases. Currently, gas composition analysis equipment mostly uses gas sensors directly exposed to the space to be tested for detection. However, this type of detection method has limitations in practical applications: when the concentration of the target gas component in the space to be tested is too low, the sensor detection signal is weak and easily affected by environmental interference, resulting in insufficient detection accuracy, or even failure to detect effectively, making it difficult to meet the needs of accurate analysis of low-concentration gas components.

[0003] For some gas sensors, there may be high-precision detectors that can detect trace amounts of gas. However, such high-precision detectors are not only complex in structure and have high manufacturing and procurement costs, but also have stringent environmental requirements when used, thus failing to achieve the goal of economy. Summary of the Invention

[0004] In view of the current state of the technology mentioned in the background, and in order to overcome the corresponding defects in the prior art, the present invention specifically discloses an automatic gas composition analysis sensor, which can better solve the problems of difficulty in accurately detecting trace gases or the high cost of using high-precision detectors.

[0005] To overcome the deficiencies of the prior art, those skilled in the art provide the following technical solution: an automatic gas composition analyzer, comprising a plurality of gas sensors, a gas storage cylinder, and a gas intake assembly, wherein the gas intake assembly draws gas from the space to be measured into the gas storage cylinder, and the probe end of the gas sensor is installed in the gas storage cylinder so that when the pressure in the gas storage cylinder reaches a set value, the gas sensor collects the gas composition information in the gas storage cylinder at this time; it also includes a composition calculation module, which calculates the content of external gas composition based on the pressure ratio between the gas storage cylinder and the space to be measured.

[0006] Furthermore, ignoring the influence of temperature, the accumulator is equipped with an internal pressure sensor and an external pressure sensor, respectively, and the calculation formula of the calculation module is as follows: , In the formula: The volume concentration of the target gas component in the space to be measured; The volume concentration of the target gas component in the accumulator is obtained by the gas sensor. The pressure of the space to be measured is obtained by the external pressure sensor; The pressure inside the accumulator cylinder is detected by the internal pressure sensor.

[0007] Furthermore, considering the influence of temperature, the accumulator is equipped with an internal pressure sensor, an external pressure sensor, an internal temperature sensor, and an external temperature sensor, respectively; the calculation formula of the calculation module is: , In the formula: The volume concentration of the target gas component in the space to be measured; The volume concentration of the target gas component in the accumulator is obtained by the gas sensor. The pressure of the space to be measured is obtained by the external pressure sensor; The pressure inside the accumulator is detected by the internal pressure sensor. The temperature of the space to be measured is obtained by an external temperature sensor; The temperature inside the accumulator is detected by an internal temperature sensor.

[0008] Furthermore, a U-shaped pressure-indicating tube is connected to one side of the gas storage cylinder, maintaining communication with the space to be measured. The pressure-indicating tube contains a liquid column formed by a non-volatile liquid. The gas storage cylinder is equipped with a vent valve that communicates with the space to be measured. When the vent valve is opened, the non-volatile liquid in the pressure-indicating tube remains in the center. When the vent valve is closed and gas is injected into the gas storage cylinder through the air intake assembly, when the height difference between the two ends of the liquid column reaches a set value, the pressure ratio between the gas storage cylinder and the space to be measured reaches the corresponding ratio.

[0009] Furthermore, the pressure-indicating tube is made of transparent, corrosion-resistant glass, with one end connected to the inside of the gas storage cylinder through a first ventilation pipe, and the other end connected to the space to be measured through a second ventilation pipe.

[0010] Furthermore, a pressure limiting ring is embedded in the vertical section of the pressure-indicating tube at the end connected to the space to be measured. The pressure limiting ring is a conductor. An insulating float is floating on the end of the liquid column near the pressure limiting ring. A hollow metal disk is supported on the end face of the float. The float slides vertically in the pressure-indicating tube with the liquid column, so as to bring the metal disk toward the pressure limiting ring. When the metal disk contacts the pressure limiting ring, the side of the metal disk contacts one end of the bridging rod. The other end of the bridging rod is fixedly connected to the side of the pressure limiting ring, so as to close a buzzer alarm circuit.

[0011] Furthermore, a push-button switch is installed in the vertical section of the pressure-indicating tube at the end connected to the space to be measured; an insulating float is floating at the end of the liquid column near the pressure-limiting ring. The float slides vertically in the pressure-indicating tube with the liquid column. When the float rises to the point of contact with the push-button switch, the push-button switch closes, thereby closing a buzzer alarm circuit.

[0012] Furthermore, the intake assembly includes an intake pipe communicating with the interior of the air storage cylinder, and an intake pump installed on the intake pipe. The intake pipe has an integral collar at its bottom inlet end, and the intake pipe has an external threaded pipe at the bottom end face of the collar. The bottom end of the external threaded pipe has an intake pipe section coaxially and integrally provided with an air inlet section. The air inlet section has several air inlet holes at the end of the external threaded pipe. It also includes an air intake hood that is thicker in the middle and thinner at both ends, which is fixed to the top of a filter assembly. The top of the air intake hood is threaded onto the external threaded tube, and the bottom end is fixedly inserted into the top center of the housing of the filter assembly. A sliding column is axially elastically slidably installed inside the bottom end of the air intake hood. When the air intake pump is started and the sliding column moves upward to the bottom end of the air intake pipe section, gas can flow from the bottom end of the air intake hood into the air intake pipe section through the air intake hole.

[0013] Furthermore, the bottom end of the intake pipe section has a mounting hole coaxially; the bottom of the mounting seat is fixed with a limit post, and a pressure spring is installed on the outside of the limit post. The bottom end of the pressure spring is connected to the top end of a sliding rod, and the bottom end of the sliding rod is coaxially fixed with the sliding column. In the non-working state, the sliding column closes the bottom end of the intake hood. The filter assembly further includes a fixed inner filter and an outer filter. The inner filter is coaxially fitted onto the slide rod where it passes through the slide column, and the slide rod is axially slidably installed relative to the inner filter. A stepped plug is fixed to the bottom end of the slide rod. In the non-working state, the stepped plug seals the air inlet at the center of the bottom end of the housing. The outer filter cover is installed at the port of the air inlet. When the suction pump is started, the slide rod moves upward and completely separates the stepped plug from the air inlet. After being filtered by the outer filter cover, the gas flows into the housing through the gap between the air inlet and the stepped plug.

[0014] Furthermore, the inner filter is a shell structure with a centrally convex truncated cone shape. The top of the central convex part of the inner filter is embedded in the end face of the bottom end of the intake pipe section, and the bottom edge of the inner filter contacts the end face of a threaded mounting ring. The threaded mounting ring is screwed into the shell to fix the inner filter axially. The inner side of the threaded mounting ring is vertically slidably engaged with the side wall of the slide rod through several connecting rods, and a hexagonal groove is provided in the center of the bottom end face of the stepped plug so that when a wrench is inserted into the hexagonal groove to rotate the slide rod, the threaded mounting ring is tightened. The outer filter screen has a circular stepped structure, which is embedded in the port of the air inlet, and the edge of the outer filter screen is fixedly connected to the inside of a screw cap. The screw cap is screwed into the bottom end face of the housing to axially press the outer filter screen.

[0015] Compared with the prior art, the beneficial effects of the present invention are: First, it can achieve accurate detection of low-concentration gases and improve detection sensitivity: The present invention uses an air intake component to draw the gas in the space to be tested into a gas storage cylinder of constant volume for artificial enrichment. Compared with the traditional direct detection method, it significantly enhances the detection signal strength of low-concentration gases and effectively avoids detection errors caused by the low concentration of the target gas. Secondly, the detection results are accurate and reliable. This invention uses internal and external pressure sensors to detect the pressure inside the gas storage cylinder and the space to be tested, respectively. Combined with the preset volume parameters and calculation formulas of the component calculation module, the actual content of gas components in the space to be tested is accurately calculated, thus eliminating the influence of pressure differences between the sampling space and the space to be tested on the detection results. Furthermore, for more intuitive and simple use, pressure control and reading are more convenient and intuitive. The pressure difference between the gas storage cylinder and the space to be tested is directly reflected by the change in the height of the liquid column in the pressure indicator tube. Combined with the design of a pressure limiting ring, metal disc, and buzzer alarm circuit, or a linkage structure of a push-button switch and float, an alarm can be automatically triggered when the pressure reaches the set value, facilitating timely control of the suction component's start and stop. Simultaneously, when necessary, the alarm circuit can be directly linked to the start and stop status of the suction pump, realizing automated control of the sampling, enrichment, and detection processes. Although the structure is simple, it also reduces manual operation intensity and improves detection efficiency. Finally, to improve the reliability of this sensor, the present invention employs a dual internal and external filtration structure. The outer filter cover and outer filter screen provide preliminary filtration, while the inner filter screen further purifies the gas, effectively preventing dust and other impurities from entering the gas storage cylinder and contaminating the sensor probe, thus extending the sensor's service life. Both the inner and outer filters adopt a detachable installation structure, allowing for quick installation and removal via threaded mounting rings, screw caps, and other components. The threaded mounting ring can also be easily adjusted via the hexagonal groove at the bottom of the stepped plug, reducing maintenance difficulty and cost. Simultaneously, the sliding column, pressure spring, and stepped plug of the air intake assembly form a double-sealed structure, effectively sealing the air intake channel when not in operation to prevent external impurities from entering and ensure the cleanliness of the equipment's interior. Other functions and features of the present invention will be described in detail in the following embodiments to provide a full understanding of the concept of the present invention and to enable its practical application in production. Attached Figure Description

[0016] Figure 1 This is a simplified structural diagram of an automatic gas composition analysis sensor according to the present invention; Figure 2 for Figure 1 Enlarged cross-sectional view of point A in the middle; Figure 3 This is a partial cross-sectional view of the intake assembly; Figure 4 This is a schematic diagram of the cross-section at the upper end of the threaded mounting ring. Figure 5 A bottom view showing the outer filter screen secured with the screw cap.

[0017] As shown in the figure, the components include: accumulator cylinder 1, intake assembly 2, intake pipe 201, collar 202, external threaded pipe section 203, intake pipe section 204, mounting hole 20401, intake hole 205, intake hood 206, limiting post 207, pressure spring 208, slide rod 209, slide column 210, outer shell 211, inner filter screen 212, central protrusion 21201, threaded mounting ring 213, connecting rod 214, stepped plug 215, hexagonal groove 216, outer filter screen 217, screw cap 218, gas sensor 3, vent valve 4, pressure indicator tube 5, first vent pipe 6, second vent pipe 7, liquid column 8, float 9, metal disc 10, bridging guide rod 11, and pressure limiting ring 12. Detailed Implementation

[0018] Based on the accompanying drawings and the following description, the technical solutions in the embodiments of the present invention can be clearly and completely described. However, it should be understood that the embodiments mentioned herein are merely one or several specific methods of the present invention, and not all implementation structures or method steps.

[0019] like Figure 1As shown, this invention proposes an embodiment, specifically introducing an automatic gas composition analysis sensor, including several sensors for detecting corresponding types of gases, a gas storage cylinder 1, and a suction assembly 2, wherein the suction assembly 2 employs a miniature electric suction pump. The suction assembly 2 is connected to the gas storage cylinder 1 via a pipe. During operation, the suction pump starts to draw air from the designated test space into the gas storage cylinder 1. The probes of the gas sensors 3 all extend into the gas storage cylinder 1 through sealed mounting holes on the side wall of the gas storage cylinder 1. In use, when the pressure inside the gas storage cylinder 1 reaches a set value (at which the physical state of the gases does not change and they do not react with each other), i.e., after the sampled gas has been artificially enriched, the gas sensors 3 simultaneously start to collect information on the content of various gases in the gas storage cylinder 1 at this time. In this embodiment, a gas composition calculation module is also integrated. This calculation module uses an STM32 microcontroller and pre-stores the volume parameters of the gas storage cylinder 1. When working, it acquires the pressure detection value inside the gas storage cylinder 1 and the pressure value of the space to be measured, calculates the pressure ratio between the two, that is, the pressure of the space to be measured and the pressure inside the gas storage cylinder 1 after sampling and aspirating the gas. Then, combined with the gas composition information in each gas storage cylinder 1 collected by the gas sensor 3, the actual content of components such as formaldehyde, benzene, and TVOC in the indoor space to be measured is finally calculated. It should be noted that, unlike simply compressing gas, this embodiment involves sampling and collecting gas into a constant-volume storage cylinder 1. Therefore, as gas continuously flows into the storage cylinder 1, the concentration of each gas inside increases, rather than the concentration of each gas remaining constant when the gas is compressed. This is because when compressing a rated volume of gas, the number of gas molecules increases while the volume they occupy decreases, so the concentration remains constant when the gas is compressed. However, in this embodiment, sample gas is continuously injected into a storage cylinder 1 with a rated volume, and the concentration of each gas component continuously increases and changes proportionally. As this design is suitable for environments with minimal temperature fluctuations, where temperature effects are negligible, an internal pressure sensor is installed in the center of the inner side of the gas storage cylinder 1, and an external pressure sensor is installed on the outer side of the sensor housing 211. Both the internal and external pressure sensors are electrically connected to the composition calculation module via data transmission lines. For example, the intake assembly 2 draws air from a test space into the gas storage cylinder 1. When the pressure inside the gas storage cylinder 1 reaches 0.15 MPa, the gas sensor 3 detects the volume concentration of a certain gas inside the gas storage cylinder 1. The value was 0.08%; simultaneously, the external pressure sensor detected the pressure of the laboratory space under test. The internal pressure sensor detects the pressure inside the accumulator cylinder 1 as 0.1 MPa. The pressure is 0.3 MPa; the component calculation module calls the preset calculation formula. Substituting the numerical values, we can obtain This means that the volume concentration of a certain gas in the space to be tested is 0.0265%, while in practice, the above detection... The value should be larger to minimize errors caused by the fact that a certain gas concentration is too low to be easily detected. like Figures 1-2 As shown, in this embodiment, a U-shaped pressure-indicating tube 5 is connected to the lower left side wall of the accumulator 1. The pressure-indicating tube 5 is filled with non-volatile silicone oil to form a liquid column 8. A vent valve 4 communicating with the space to be measured is provided on the upper right side wall of the accumulator 1. The vent valve 4 can be an electromagnetic control valve. In this embodiment, during detection, when the vent valve 4 is opened, the inside of the gas storage cylinder 1 is connected to the space to be measured, and the air pressure remains consistent. At this time, the silicone oil column 8 in the pressure indicator tube 5 is centered, and the height difference H between the two ends of the liquid level is 0. When the detection starts, the vent valve 4 is closed, and the air intake component 2 is activated to inject air or gas from the space to be measured into the gas storage cylinder 1. As the air pressure in the gas storage cylinder 1 gradually increases, the silicone oil liquid level on the side of the pressure indicator tube 5 closest to the gas storage cylinder 1 gradually decreases, while the liquid level on the other side gradually increases. When the height difference H is set to 5cm, the pressure ratio between the gas storage cylinder 1 and the space to be measured is 1.2:1. When the height difference between the two ends of the liquid column 8 reaches 5cm, the air intake component 2 stops working, and at this time, the gas sensor 3 begins to collect the gas composition information in the gas storage cylinder 1. In this embodiment, the pressure-indicating tube 5 is made of transparent, corrosion-resistant borosilicate glass, such as... Figure 1 As shown, one end of the pressure gauge 5 is connected to the inside of the accumulator 1 via the first ventilation pipe 6, and the connection between the first ventilation pipe 6 and the accumulator 1 is sealed with a fluororubber sealing ring; the other end is connected to the space to be measured via the second ventilation pipe 7, and the air inlet end of the second ventilation pipe 7 is equipped with a dust filter. The transparent borosilicate glass material allows the operator to visually observe the height change of the liquid column 8, and its corrosion-resistant properties can prevent damage to the pressure gauge 5 from corrosive gases that may be present in the workshop. The fluororubber sealing ring ensures the sealing of the connection between the first ventilation pipe 6 and the accumulator 1, preventing gas leakage from affecting the accuracy of pressure detection. More specifically, such as Figure 2As shown, an annular pressure limiting ring 12 is embedded and fixed in the vertical pipe section at the end of the pressure-indicating tube 5 that connects to the space to be measured. An insulating plastic float 9 floats on one end of the liquid column 8 near the pressure limiting ring 12. A hollow metal disk 10 is provided on the upper surface of the float 9 by means of adhesive fixation or non-fixation. The metal disk 10 moves vertically together with the float 9. In this embodiment, the float 9 slides vertically in the pressure-indicating tube 5 with the liquid column 8. When the gas intake component 2 injects gas into the gas storage cylinder 1, causing the liquid column 8 to rise, the float 9, along with the metal disk 10, moves towards the pressure limiting ring 12. A bridging rod 11 is fixed to the outside of the pressure-indicating tube 5. The bridging rod 11 is made of copper, with one end extending to the side area of ​​the metal disk 10 inside the pressure-indicating tube 5, and the other end fixedly connected to the side of the pressure-limiting ring 12. In addition, a buzzer alarm circuit is provided, which mainly consists of a power supply, a buzzer, the pressure-limiting ring 12, the metal disk 10, and the bridging rod 11. When the metal disk 10 contacts the pressure-limiting ring 12, the side of the metal disk 10 contacts one end of the bridging rod 11, which closes the buzzer alarm circuit and the buzzer sounds an alarm, indicating that the pressure in the accumulator 1 has reached the set value, so that the pump can be stopped in time and the accumulator 1 can be closed. At this time, the pressure between the accumulator 1 and the space to be measured is within the set pressure difference range, so that the concentration of each gas component in the space to be measured can be directly calculated. In addition to controlling the pressure inside the accumulator cylinder 1 as described above, a normally closed push-button switch (which can be...) is fixedly installed in the vertical pipe section at the end of the pressure-indicating tube 5 that connects to the space to be measured. Figure 2 (At the location of the limiting ring in the middle); an insulating rubber float 9 floats at one end of the liquid column 8 near this end. The float 9 can slide vertically within the pressure-indicating tube 5 along with the liquid column 8, thereby pushing the float 9 to trigger the press switch, which is the switch that directly activates the buzzer alarm. When the suction assembly 2 injects gas into the accumulator 1, the liquid column 8 rises, causing the float 9 to float up. When the float 9 floats up to the point of contacting the pressing end of the press switch, the press switch closes, the buzzer alarm circuit is activated, and the buzzer sounds an alarm, informing the staff that the pressure in the accumulator 1 has reached the set value, and the gas sensor 3 can be activated to collect components. In addition, it can also be directly and automatically linked to the start and stop of the suction pump. When the buzzer alarm sounds, the suction pump is shut down, and the one-way valve (not shown in the figure) installed at the outlet end of the pipeline of the suction assembly prevents the gas in the accumulator 1 from flowing back, fully sealing the accumulator 1.

[0020] Furthermore, the three methods for calculating the gas composition content in the space to be measured based on the pressure difference relationship mentioned above can be used individually or in combination, with each method serving as a reference when necessary to determine the accuracy of the detection under each method.

[0021] As one of the specific implementation structures, such as Figure 1 , Figure 3As shown, the suction assembly 2 in this embodiment includes a suction pipe 201 that communicates with the top of the inside of the storage cylinder 1. The aforementioned one-way valve can be installed in the suction pipe 201 within the cavity of the storage cylinder 1 used for gas accumulation. A miniature suction pump is installed on the suction pipe 201, and the miniature suction pump can be installed in the upper mounting cavity inside the storage cylinder 1. (Continue reading) Figure 3 An annular collar 202 is integrally formed at the bottom inlet end of the intake pipe 201. A section of externally threaded pipe is machined into the intake pipe 201 near the bottom end of the collar 202. An air inlet section 204 is integrally formed coaxially at the bottom end of the externally threaded pipe. Multiple air inlet holes 205 with a diameter of 2mm are evenly distributed circumferentially near the end of the externally threaded pipe on the air inlet section 204. The intake assembly 2 also includes an intake hood 206 fixed to the top of the filter assembly. The intake hood 206 has a hollow structure that is thicker in the middle and thinner at both ends, and can be made of ABS plastic. The internal thread at the top of the intake hood 206 engages with the externally threaded pipe, and the bottom end is fixedly inserted into the top center of the outer shell 211 of the filter assembly by threads or other means. A cylindrical slide rod 210 is axially elastically slidably installed inside the bottom end of the suction hood 206. When the suction pump is started, the negative pressure generated causes the slide rod 210 to move upward to the bottom end of the air intake pipe section 204. At this time, the gas can flow from the bottom end of the suction hood 206 into the air intake pipe section 204 through the air intake hole 205, and then enter the air storage cylinder 1 through the suction pipe 201. In the preferred design of the seat, when the suction pump stops working, the slide rod 210 moves downward under its own weight and the pressure spring 208 mentioned later, sealing the bottom end of the suction hood 206. like Figure 3In this embodiment, the bottom end of the intake pipe section 204 has a mounting hole 20401 coaxially machined; a limiting post 207 is fixed at its bottom, and a pressure spring 208 is fitted on the outside of the limiting post 207. The bottom end of the pressure spring 208 abuts against the top end of a sliding rod 209. The bottom end of the sliding rod 209 is coaxially and integrally fixed with the sliding column 210. In the non-working state, that is, when not sucking gas, the pressure spring 208 is in a compressed state, pushing the sliding column 210 to close the bottom end of the suction hood 206, achieving the purpose of normal closure and realizing a first-order closure. In specific manufacturing, its filter assembly also includes a fixedly installed inner filter screen 212 and an outer filter screen 217. The inner filter screen 212 is coaxially sleeved on the part of the sliding rod 209 that passes through the sliding column 210, and the sliding rod 209 and the inner filter screen 212 are axially slidably installed through a bushing. A stepped plug 215 is fixed to the bottom end of the slide rod 209. In the non-working state, the stepped plug 215 seals the air inlet at the center of the bottom end of the housing 211, achieving double sealing protection. An external filter cover is installed at the port of the air inlet. When the suction pump is started, the negative pressure generated overcomes the elastic force of the pressure spring 208, causing the slide rod 209 to move upward, completely separating the stepped plug 215 from the air inlet. After the gas is initially filtered by the external filter cover, it flows into the housing through the gap between the air inlet and the stepped plug 215. After being filtered again by the internal filter screen 212, it enters the suction hood 206.

[0022] In the specific production process, such as Figure 3 In this embodiment, the inner filter 212 is a shell structure with a centrally protruding frustoconical shape, made of stainless steel. The top of the central protrusion 21201 of the inner filter 212 is detachably embedded in the end face of the bottom of the intake pipe section 204. The bottom edge of the inner filter 212 contacts the upper end face of a threaded mounting ring 213. The external thread of the threaded mounting ring 213 engages with the internal thread of the shell and is screwed into the shell, thereby axially fixing the inner filter 212 and facilitating quick installation, removal, and adjustment of the inner filter 212. More specifically, as... Figure 4 As shown, the inner side of the threaded mounting ring 213 is slidably engaged with the side wall of the slide rod 209 via three evenly distributed connecting rods 214. This not only allows for transmission connection with the slide rod 209 but also permits axial sliding of the slide rod 209. Specifically, vertical guide grooves are machined on the connecting rods 214. Figure 3 (Not shown in the diagram) A guide boss is provided at the corresponding position on the side wall of the slide rod 209. The guide boss is embedded in the guide groove to achieve vertical sliding. To facilitate the rotation of the threaded mounting ring 213, such as Figure 3 , Figure 5A hexagonal groove 216 is provided in the center of the bottom end face of the stepped plug 215. When it is necessary to install or remove the inner filter screen 212, insert a wrench into the hexagonal groove 216 and rotate the slide rod 209 to tighten or loosen the threaded mounting ring 213. The outer filter screen 217 has a circular stepped structure and is installed in the port of the air inlet in a detachable embedded manner, which is conducive to positioning and installation. Figure 3 As shown, the edge of the outer filter screen 217 is detachably fixed to the inside of a screw cap 218. The internal thread of the screw cap 218 engages with the external thread at the bottom of the housing to screw in, thereby axially pressing the outer filter screen 217, which facilitates the later disassembly and replacement of the outer filter screen 217.

[0023] This invention is not limited to the field covered by this embodiment. Some well-known structures or principles have not been further described. However, those skilled in the art can theoretically know all the well-known technologies in this field prior to the application date or priority date, and can fully master all the prior art in this field. They also have the means and ability to apply these prior art in practical design. Under the technical guidance provided in this application, those skilled in the art can more comprehensively improve and implement this invention by combining their own capabilities. Furthermore, it should be noted that although the text and graphics of the above embodiments have shown specific implementation scenarios of the invention, those skilled in the art can make various obvious extensions and expansions to these embodiments without departing from the design concept of the invention, forming different embodiments. However, this does not affect the fact that the scope of protection of the invention is covered and embodied by the technical features of this claim and equivalent technical features.

Claims

1. An automatic gas composition analysis sensor, comprising a plurality of gas sensors (3), characterized in that, It also includes a gas storage cylinder (1) and a gas intake assembly (2). The gas intake assembly (2) draws the gas in the space to be measured into the gas storage cylinder (1). The probe end of the gas sensor (3) is installed in the gas storage cylinder (1) so that when the pressure in the gas storage cylinder (1) reaches the set value, the gas sensor (3) collects the gas composition information in the gas storage cylinder (1) at this time. It also includes a component calculation module, which calculates the content of external gas components based on the pressure ratio between the gas storage cylinder (1) and the space to be measured.

2. The automatic gas composition analyzer according to claim 1, characterized in that, Ignoring the influence of temperature, the accumulator (1) is equipped with an internal pressure sensor and an external pressure sensor, respectively. The calculation formula of the calculation module is as follows: , In the formula: The volume concentration of the target gas component in the space to be measured; The volume concentration of the target gas component in the gas storage cylinder (1) is obtained by the gas sensor (3); The pressure of the space to be measured is obtained by the external pressure sensor; The pressure inside the accumulator (1) is detected by the internal pressure sensor.

3. The automatic gas composition analyzer according to claim 1, characterized in that, When considering the influence of temperature, the accumulator (1) is equipped with an internal pressure sensor, an external pressure sensor, an internal temperature sensor, and an external temperature sensor, respectively; the calculation formula of the calculation module is: , In the formula: The volume concentration of the target gas component in the space to be measured; The volume concentration of the target gas component in the gas storage cylinder (1) is obtained by the gas sensor (3); The pressure of the space to be measured is obtained by the external pressure sensor; The pressure inside the accumulator (1) is detected by the internal pressure sensor; The temperature of the space to be measured is obtained by an external temperature sensor; The temperature inside the accumulator (1) is detected by an internal temperature sensor.

4. The automatic gas composition analyzer according to claim 1, characterized in that, One side of the gas storage cylinder (1) is connected to a U-shaped pressure indicator tube (5) that is in communication with the space to be measured. The pressure indicator tube (5) contains a liquid column (8) formed by a non-volatile liquid. The gas storage cylinder (1) is provided with a vent valve (4) that is in communication with the space to be measured. When the vent valve (4) is opened, the non-volatile liquid in the pressure indicator tube (5) stays in the middle. When the vent valve (4) is closed and gas is injected into the gas storage cylinder (1) through the air intake component (2), when the height difference between the two ends of the liquid column (8) reaches the set value, the pressure in the gas storage cylinder (1) and the pressure in the space to be measured reach the corresponding ratio.

5. The automatic gas composition analyzer according to claim 4, characterized in that, The pressure-indicating tube (5) is made of transparent corrosion-resistant glass. One end of it is connected to the inside of the gas storage cylinder (1) through the first ventilation pipe (6), and the other end is connected to the space to be measured through the second ventilation pipe (7).

6. The automatic gas composition analyzer according to claim 1, characterized in that, A pressure limiting ring (12) is embedded in the vertical section of the pressure-indicating tube (5) that is connected to the space to be measured. The pressure limiting ring (12) is a conductor. An insulating float (9) floats on one end of the liquid column (8) near the pressure limiting ring (12). A hollow metal disk (10) is supported on the end face of the float (9). The float (9) slides vertically in the pressure-indicating tube (5) with the liquid column (8) to bring the metal disk (10) closer to the pressure limiting ring (12). When the metal disk (10) contacts the pressure limiting ring (12), the side of the metal disk (10) contacts one end of the bridging rod (11). The other end of the bridging rod (11) is fixedly connected to the side of the pressure limiting ring (12) so that a buzzer alarm circuit is closed.

7. The automatic gas composition analyzer according to claim 1, characterized in that, A push-button switch is installed in the vertical section of the pressure-indicating tube (5) that is connected to the space to be measured; an insulating float (9) floats on one end of the liquid column (8) near the pressure limiting ring (12). The float (9) slides vertically in the pressure-indicating tube (5) along with the liquid column (8). When the float (9) floats up to the point of contact with the push-button switch, the push-button switch closes, thereby closing a buzzer alarm circuit.

8. The automatic gas composition analyzer according to claim 1, characterized in that, The air intake assembly (2) includes an air intake pipe (201) communicating with the inside of the air storage cylinder (1) and an air intake pump installed on the air intake pipe (201). The air intake pipe (201) has an integral collar (202) at its bottom inlet end. The air intake pipe (201) near the bottom end face of the collar (202) has a section of external threaded pipe. The bottom end of the external threaded pipe has an air intake pipe section (204) coaxially and integrally provided. The air intake pipe section (204) is provided with several air intake holes (205) at the end of the external threaded pipe. It also includes an air intake hood (206) that is thicker in the middle and thinner at both ends, which is fixed to the top of a filter assembly. The top of the air intake hood (206) is threadedly fitted onto the external threaded tube, and the bottom end is fixedly inserted into the top center of the housing (211) of the filter assembly. A sliding column (210) is axially elastically slidably installed in the bottom end of the air intake hood (206). When the air intake pump is started and the sliding column (210) moves upward to the bottom end of the air intake pipe section (204), the gas can flow from the bottom end of the air intake hood (206) into the air intake pipe section (204) through the air intake hole (205).

9. The automatic gas composition analyzer according to claim 8, characterized in that, The bottom end of the intake pipe section (204) has a mounting hole (20401) coaxially. The bottom of the mounting seat is fixed with a limiting post (207). A pressure spring (208) is installed on the outside of the limiting post (207). The bottom end of the pressure spring (208) abuts against the top end of a sliding rod (209). The bottom end of the sliding rod (209) is coaxially fixed with the sliding column (210). In the non-working state, the sliding column (210) closes the bottom end of the intake hood (206). The filter assembly also includes a fixed inner filter screen (212) and an outer filter screen (217). The inner filter screen (212) is coaxially sleeved on the slide rod (209) where it passes through the slide column (210), and the slide rod (209) is axially slidably installed relative to the inner filter screen (212). A stepped plug (215) is fixed at the bottom end of the slide rod (209). In the non-working state, the stepped plug (215) closes the air inlet at the center of the bottom end of the housing (211). The port of the air inlet is covered with the outer filter cover. When the suction pump is started, the slide rod (209) moves upward and completely separates the stepped plug (215) from the air inlet. After being filtered by the outer filter cover, the gas flows into the housing through the gap between the air inlet and the stepped plug (215).

10. An automatic gas composition analyzer according to claim 9, characterized in that, The inner filter (212) is a shell structure with a centrally convex truncated cone shape. The top of the central convex part (21201) of the inner filter (212) is embedded in the end face of the bottom end of the air intake pipe section (204), and the bottom edge of the inner filter (212) contacts the end face of a threaded mounting ring (213). The threaded mounting ring (213) is screwed into the shell to fix the inner filter (212) axially. The inner side of the threaded mounting ring (213) is vertically slidably engaged with the side wall of the slide rod (209) through several connecting rods (214). A hexagonal groove (216) is provided in the center of the bottom end face of the stepped plug (215) so that when the wrench is inserted into the hexagonal groove (216) to rotate the slide rod (209), the threaded mounting ring (213) is tightened. The outer filter (217) has a circular stepped structure and is embedded in the port of the air inlet. The edge of the outer filter (217) is fixedly connected to the inside of a screw cap (218). The screw cap (218) is screwed into the bottom end face of the housing to axially press the outer filter (217).

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