A multi-parameter gas flow calibration device

Abstract

The utility model discloses a kind of multi-parameter gas flow calibration devices, including shell;Large flow measurement module includes large flow gas inlet interface, large flow gas outlet interface and large flow laminar flowmeter, and large flow gas inlet interface and large flow gas outlet interface are located on shell, and large flow laminar flowmeter is located in shell inner cavity;Small flow measurement module includes small flow gas inlet interface, small flow gas outlet interface and small flow laminar flowmeter, and small flow gas inlet interface and small flow gas outlet interface are located on shell, and small flow laminar flowmeter is located in shell inner cavity;Pressure measurement module includes pressure generating module and pressure interface component, and pressure interface component is located on shell, and pressure generating module is located in shell inner cavity, and the pressurizing interface of pressure generating module is located on shell;Smoke temperature calibration interface is located on shell.This scheme can realize wide range coverage, reduce replacement link, and integrated multi-parameter measurement.

Description

Technical Field

[0001] This utility model relates to the field of gas measurement technology, and in particular to a multi-parameter gas flow calibration device. Background Technology

[0002] In the current field of gas measurement and calibration, flow meters based on the orifice throttling principle (such as orifice plate flow meters) are widely used. However, these flow meters have an inherent technical limitation of narrow range ratio. To cover calibration requirements with a wide flow range, existing solutions typically involve mechanically connecting multiple orifice flow meters with different ranges in parallel or using them in combination via pipeline switching. This approach directly results in a complex and bulky overall measurement system, cumbersome operation procedures when switching ranges, low automation, and poor system reliability. Furthermore, these traditional devices have limited functionality and cannot meet the requirements of efficient and integrated modern calibration.

[0003] The information disclosed in this background section is only intended to enhance the understanding of the background technology of this application, and therefore may include prior art that is not known to those skilled in the art. Utility Model Content

[0004] In response to the problems mentioned in the background art, this utility model proposes a multi-parameter gas flow calibration device that achieves wide range coverage, reduces replacement steps, and integrates multi-parameter measurement.

[0005] To achieve the above-mentioned objectives, the present invention employs the following technical solution: In some embodiments of this application, a multi-parameter gas flow rate calibration device is provided, comprising: case; A high-flow-rate measurement module includes a high-flow-rate inlet port, a high-flow-rate outlet port, and a high-flow-rate laminar flow meter. The high-flow-rate laminar flow meter is connected to a first pressure sensor and a first differential pressure sensor. The high-flow-rate inlet port and the high-flow-rate outlet port are disposed on the housing, and the high-flow-rate laminar flow meter is disposed in the inner cavity of the housing. The low-flow measurement module includes a low-flow air inlet, a low-flow air outlet, and a low-flow laminar flow meter. The low-flow laminar flow meter is connected to a second pressure sensor and a second differential pressure sensor. The low-flow air inlet and the low-flow air outlet are disposed on the housing, and the low-flow laminar flow meter is disposed in the inner cavity of the housing. The pressure measurement module includes a pressure generating module and a pressure interface. The pressure interface is disposed on the housing, the pressure generating module is disposed in the inner cavity of the housing, and the pressurization interface of the pressure generating module is disposed on the housing. The pressurization interface is connected to the pressure interface and the instrument to be calibrated via a three-way connector II. A smoke temperature calibration interface is provided on the housing, and the smoke temperature calibration interface is configured to connect to the instrument being calibrated for temperature calibration.

[0006] In some embodiments of this application, the high-flow laminar flow meter includes a first housing, one end of which is provided with a first air inlet and the other opposite end is provided with a first air outlet. A laminar flow plate group is provided in the inner cavity of the first housing. The air inlet end of the laminar flow plate group is provided with an air inlet rectifier and the air outlet end is provided with an air outlet rectifier. The first housing is also provided with a first temperature measuring plate and a first pressure tap.

[0007] In some embodiments of this application, the small-flow laminar flow meter includes a second housing, one end of which is provided with a second air inlet and the other opposite end is provided with a second air outlet. A laminar flow plate assembly is provided in the inner cavity of the second housing, and a second temperature measuring plate and a second pressure tap are also provided on the second housing.

[0008] In some embodiments of this application, an air intake filter is provided between the high-flow-rate air intake port and the high-flow-rate laminar flow meter, and a filter is provided between the low-flow-rate air intake port and the low-flow-rate laminar flow meter.

[0009] In some embodiments of this application, the flow range of the large-flow laminar flow meter is (2-230) L / min, and the range ratio reaches 115:1; the flow range of the small-flow laminar flow meter is (10-2000) ml / min, and the range ratio reaches 200:1.

[0010] In some embodiments of this application, the pressure interface assembly includes a micro-pressure positive interface, a micro-pressure tee connector, a micro-pressure sensor, and a micro-pressure negative interface connected in sequence, wherein the micro-pressure tee connector is connected to a gas container; the pressure interface assembly also includes a gauge pressure positive interface, a gauge pressure sensor, and a gauge pressure negative interface connected in sequence.

[0011] In some embodiments of this application, the measurement range of the micro-pressure sensor is ±10 kPa, and the measurement range of the gauge pressure sensor is ±100 kPa.

[0012] In some embodiments of this application, the housing is provided with a communication interface, which is configured to connect to an external gas flow calibration device for reading measurement data.

[0013] In some embodiments of this application, a display screen is provided on the housing.

[0014] In some embodiments of this application, the low-flow measurement module includes multiple gas paths connected in parallel.

[0015] Compared with the prior art, the advantages and positive effects of this utility model are: This application integrates a high-flow-rate measurement module and a low-flow-rate measurement module. Through a precise configuration of a high-flow-rate laminar flow meter paired with a first pressure sensor and a first differential pressure sensor, and a low-flow-rate laminar flow meter paired with a second pressure sensor and a second differential pressure sensor, it achieves full coverage measurement across a wide flow range. The integrated dual-module design eliminates the need for additional mechanical parallel components and complex switching pipelines, fundamentally solving the inherent defect of narrow range ratio. It also simplifies the overall structure of the measurement system and reduces pipeline connection nodes. This application integrates core components such as large-flow laminar flow meter, small-flow laminar flow meter, and pressure generation module into the same housing cavity, and all external interfaces are uniformly set on the housing, realizing highly compact assembly of functional components, which helps to reduce the overall size of the device, improve the portability of the device, and facilitate flexible deployment in different calibration scenarios. This application utilizes an integrated dual flow measurement module within the housing, allowing direct selection of the corresponding interface to connect to the instrument under calibration based on actual calibration needs. This eliminates the need for additional mechanical switching mechanisms, simplifying the range switching process and reducing human error rates. Building upon the dual flow measurement module, this application adds a pressure measurement module and a flue gas temperature calibration interface. The pressure measurement module, comprised of a pressure generation module, a T-connector II, and a pressure interface, enables simultaneous calibration of pressure parameters. The flue gas temperature calibration interface can be directly connected to the instrument under calibration to complete temperature calibration. This multi-parameter integrated design consolidates flow, pressure, and temperature calibration functions into a single unit, eliminating the need for multiple independent calibration devices, thus improving calibration efficiency and reducing calibration costs.

[0016] Other features and advantages of this utility model will become clearer after reading the detailed embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A front view of a multi-parameter gas flow calibration device according to some embodiments; Figure 2 A left view of a multi-parameter gas flow calibration device according to some embodiments; Figure 3 A right view of a multi-parameter gas flow calibration device according to some embodiments; Figure 4 A rear view of a multi-parameter gas flow calibration device according to some embodiments; Figure 5 This is a schematic diagram of a multi-parameter gas flow rate calibration device according to some embodiments; Figure 6 An exploded view of a high-flow laminar flow meter according to some embodiments; Figure 7 An exploded view of a small-flow laminar flow meter according to some embodiments; Figure 8 This is a structural diagram of a linear slide motion assembly according to some embodiments.

[0019] Figure label: 01. High flow rate measurement module; 02. Low flow rate measurement module; 03. Pressure measurement module; 031. Pressure generation module; 032. Pressure interface components; 1. Display screen; 2. Power switch; 3. Voice module output port; 5. Status indicator light; 6. Communication interface; 7. High-flow air intake port; 8. Low-flow air intake port; 9. USB; 10. Smoke temperature calibration interface; 11. Automatic calibration interface; 12. Low-flow air outlet port; 13. High-flow air outlet port; 14. Pressurization port; 15. Micro-pressure positive port; 16. Micro-pressure negative port; 17. Gauge pressure positive port; 18. Gauge pressure negative port; 19. Handle; 20. Charging port; 21. Charging indicator light; 22. Heat dissipation vent; 23. 24. Inlet filter; 25. Large flow laminar flow meter; 26. Linear slide motion assembly; 27. First solenoid valve; 28. Three-way connector I; 29. ​​Second solenoid valve; 30. Gas container; 31. Micro-pressure three-way connector; 32. Micro-pressure filter; 33. Gauge pressure sensor; 34. Micro-pressure sensor; 35. Gauge pressure filter; 36. Filter; 37. Small flow laminar flow meter; 38. First pressure sensor; 39. First differential pressure sensor; 40. Second pressure sensor; 41. Housing; 241. First outer casing; 242. First air inlet; 243. First air outlet; 244. High-flow laminar flow vane assembly; 245. First temperature gauge plate; 246. First pressure tap; 247. Inlet rectifier; 248. Outlet rectifier; 361. Second outer casing; 362. Second air inlet; 363. Second air outlet; 364. Small flow laminar flow vane assembly; 365. Second temperature gauge plate; 366. Second pressure tap; 251. Cylinder; 252. Linear slide; 253. First slotted optocoupler; 254. Light shield; 255. Second slotted optocoupler; 256. Slider seat; 257. Movable joint; 258. Piston rod; 259. Cylinder seat. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0021] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0022] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0023] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0024] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0025] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0026] In some embodiments of this application, reference is made to Figure 5 A multi-parameter gas flow calibration device is provided, comprising a large flow measurement module 01, a small flow measurement module 02, a pressure measurement module 03, etc.

[0027] The multi-parameter gas flow calibration device includes a high-flow-rate measurement module 01. The high-flow-rate measurement module 01 includes a high-flow-rate inlet port 7, a high-flow-rate outlet port 13, and a high-flow-rate laminar flow meter 24. The high-flow-rate laminar flow meter 24 is connected to a first pressure sensor 37 and a first differential pressure sensor 38. Figure 6 An exploded view of a high-flow laminar flow meter 24.

[0028] The multi-parameter gas flow calibration device includes a small flow measurement module 02. The small flow measurement module 02 includes a small flow inlet port 8, a small flow outlet port 12, and a small flow laminar flow meter 36. The small flow laminar flow meter 36 is connected to a second pressure sensor 39 and a second differential pressure sensor 40. Figure 7 An exploded view of a small-flow laminar flow meter 36.

[0029] The multi-parameter gas flow calibration device includes a pressure measurement module 03. The pressure measurement module 03 includes a pressure generation module 031 and a pressure interface component 032. The pressurization interface 14 is connected to the pressure interface component 032 and the instrument to be calibrated via an external tee connector II (not shown).

[0030] Reference Figure 5 The pressure generating module 031 includes a pressurization interface 14, a first solenoid valve 26, a second solenoid valve 28, a three-way connector I 27, and a linear slide motion assembly 25. The first end of the three-way connector I 27 is connected to the linear slide motion assembly 25, the second end is connected to the first solenoid valve 26, and the third end is connected to the second solenoid valve 28. The first solenoid valve 26 is connected to the pressurization interface 14. The pressurization interface 14 is connected to an external three-way connector II. One end of the three-way connector II is connected to the instrument to be calibrated, and the other end is connected to the pressure interface 032. The first solenoid valve 26 and the second solenoid valve 28 are normally closed DC solenoid valves.

[0031] Reference Figure 8 The linear slide motion assembly 25 includes a linear slide 252, on which a slider seat 256 is slidably mounted. A second slotted optocoupler 255 and a light-shielding plate 254 are fixedly mounted on the slider seat 256. The linear slide motion assembly 25 also includes a cylinder 251, whose piston rod 258 is connected to the slider seat 256. The linear slide 252 drives the piston rod 258 to perform linear reciprocating motion, thereby achieving the function of increasing and decreasing pressure in the pipeline, with a pressure range of ±50 kPa.

[0032] The linear slide 252 has a travel of 100mm and its speed can be infinitely adjusted by controlling the pulse frequency through a stepper motor drive.

[0033] The linear slide motion assembly 25 also includes a first slotted optocoupler 253, which is arranged opposite to a second slotted optocoupler 255. The stroke of the cylinder 251 is limited by the first slotted optocoupler 253 and the second slotted optocoupler 255 to detect the position signal of the light shield 254, and its stroke range is 65-70mm.

[0034] The pressurization process of the pressure generating module 031 includes: closing the first solenoid valve 26, opening the second solenoid valve 28, activating the linear slide 252, and driving the piston rod 258 to extend and stop when it reaches the detection position of the second slotted optocoupler 255, preparing for the pressurization action; closing the second solenoid valve 28, opening the first solenoid valve 26, activating the linear slide 252, and driving the piston rod 258 towards the first slotted optocoupler 253 to perform the pressurization action until the preset pressure value is reached, completing the pressurization operation. Pressurization refers to applying positive pressure to the pipeline of the instrument being calibrated.

[0035] The pressure reduction process of pressure generating module 031 includes: closing the first solenoid valve 26, opening the second solenoid valve 28, activating the linear slide 252, and driving the piston rod 258 to stop when it reaches the detection position of the first slotted optocoupler 253, preparing for the pressure reduction action; closing the second solenoid valve 28, opening the first solenoid valve 26, activating the linear slide 252, and driving the piston rod 258 towards the second slotted optocoupler 255 to perform the pressure reduction action until the preset pressure value is reached, completing the pressure reduction operation. Pressure reduction refers to drawing negative pressure into the pipeline of the instrument being calibrated.

[0036] This application establishes a high-flow-rate measurement module 01 and a low-flow-rate measurement module 02, respectively equipped with a high-flow-rate laminar flow meter 24 and a low-flow-rate laminar flow meter 36, and correspondingly equipped with a first pressure sensor 37, a first differential pressure sensor 38, a second pressure sensor 39, and a second differential pressure sensor 40, forming a measurement system adapted to high and low flow rates. This device can flexibly adapt to different flow scenarios according to calibration requirements, achieving seamless coverage of a wide flow range. Furthermore, the combination of laminar flow meters and dedicated sensors ensures the accuracy of measurement data in each flow range.

[0037] This application integrates the high-flow-rate measurement module 01, the low-flow-rate measurement module 02, and the pressure measurement module 03 into a single integrated design. Each module is organically connected through a reasonable pipeline interface, eliminating the need for additional complex parallel pipelines and switching mechanisms. Simultaneously, the pressure generating module 031 highly integrates components such as the linear slide motion assembly 25, solenoid valves, and tee connectors, resulting in a compact structure.

[0038] The pressure generating module 031 of this application uses a stepper motor to drive a linear slide 252, enabling stepless adjustment of the slide's running speed. It also uses the first slotted optocoupler 253 and the second slotted optocoupler 255 to detect the position of the light-shielding plate 254, thus precisely limiting the stroke of the cylinder 251. Combined with the automatic switching control of the first solenoid valve 26 and the second solenoid valve 28, it achieves a fully automated execution process for pressurization and depressurization. This device can accurately achieve the preset pressure value and adapt the flow module without manual intervention, simplifying the operation steps, lowering the skill threshold for operators, avoiding human error, and improving the efficiency of calibration work.

[0039] The device described in this application integrates both flow measurement and pressure control functions. Through the pressure generation module 031, it can flexibly apply positive pressure and extract negative pressure to the pipeline of the instrument being calibrated, meeting the pressure adaptation requirements of different gas calibration scenarios. This multi-parameter integration feature allows the device to complete the entire gas calibration process without the need for additional pressure regulation equipment.

[0040] In some embodiments of this application, reference is made to Figure 8 The piston rod 258 has a movable joint 257 at its end, which is connected to the slider seat 256. The movable joint 257 is used to compensate for the installation error between the cylinder 251 and the linear slide 252, ensuring the normal operation of the cylinder 251.

[0041] In some embodiments of this application, reference is made to Figure 6The high-flow laminar flow meter 24 includes a first housing 241, with a first air inlet 242 at one end and a first air outlet 243 at the opposite end. A laminar flow vane assembly, denoted as the high-flow laminar flow vane assembly 244, is disposed within the inner cavity of the first housing 241. The high-flow laminar flow vane assembly 244 has an inlet rectifier vane 247 at its inlet end and an outlet rectifier vane 248 at its outlet end. The first housing 241 also includes a first temperature gauge plate 245 and a first pressure tap 246.

[0042] The first thermometer plate 245 is used to measure the upstream gas temperature and compensate for gas viscosity based on temperature changes to ensure measurement accuracy.

[0043] The first pressure tap 246 is connected to the first pressure sensor 37 and the first differential pressure sensor 38 via a silicone rubber tube. It is used to obtain the pressure values ​​before and after the gas passes through the laminar flow plate. The pressure difference ΔP is calculated to obtain the volumetric flow rate Q.

[0044] The exhaust rectifier 248 and the intake rectifier 247 are two 80-mesh stainless steel screens used to organize the upstream turbulent gas into a more regular, symmetrical and stable gas, thereby creating ideal measurement conditions for the downstream flow measurement element.

[0045] The high-flow laminar flow plate group 244 consists of multiple high-flow laminar flow plates. The high-flow laminar flow plates are made of 304 mirror stainless steel and are formed by etching process. The thickness is 0.2mm. Its size and structure determine the measurement range, accuracy and linearity of the flow meter.

[0046] In some embodiments of this application, reference is made to Figure 5 An air intake filter 23 is provided between the large flow inlet 7 and the large flow laminar flow meter 24. The air intake filter 23 has a filtration accuracy of 40μm to prevent particulate matter from clogging the small flow channels of the laminar flow element and causing the flow meter to fail.

[0047] In some embodiments of this application, the small flow rate measurement module 02 includes multiple gas paths connected in parallel. For example, Figure 5 The small flow measurement module 02 includes four parallel gas paths.

[0048] In some embodiments of this application, reference is made to Figure 7 The small-flow laminar flow meter 36 includes a second housing 361. One end of the second housing 361 is provided with a second air inlet 362, and the other opposite end is provided with a second air outlet 363. A laminar flow vane group, referred to as the small-flow laminar flow vane group 364, is provided in the inner cavity of the second housing 361. A second temperature measuring plate 365 and a second pressure tap 366 are also provided on the second housing 361.

[0049] The second pressure tap 366 is connected to the second pressure sensor 39 and the second differential pressure sensor 40 via a silicone rubber tube. It is used to obtain the pressure values ​​before and after the gas passes through the laminar flow plate. The pressure difference ΔP is calculated to obtain the volumetric flow rate Q.

[0050] The 364 low-flow laminar flow plate group consists of multiple low-flow laminar flow plates, which are made of 304 mirror stainless steel and formed by etching process.

[0051] In some embodiments of this application, a filter 35 is provided between the low-flow air inlet port 8 and the low-flow laminar flow meter 36. The filter 35 is made of PP material and has a filtration accuracy of 80μm.

[0052] In some embodiments of this application, the flow range of the high-flow laminar flow meter 24 is (2-230) L / min, and the range ratio reaches 115:1. The flow range of the low-flow laminar flow meter 36 is (10-2000) ml / min, and the range ratio reaches 200:1.

[0053] In some embodiments of this application, reference is made to Figure 5 The pressure interface component 032 includes a micro-pressure positive interface 15, a micro-pressure tee connector 30, a micro-pressure sensor 33, and a micro-pressure negative interface 16 connected in sequence. The micro-pressure tee connector 30 is connected to an air container 29 to prevent minor pressure fluctuations. Micro-pressure filters 31 are respectively installed between the micro-pressure positive interface 15 and the micro-pressure sensor 33, and between the micro-pressure negative interface 16 and the micro-pressure sensor 33. The micro-pressure tee connector 30 is installed between the micro-pressure filter 31 and the micro-pressure sensor 33, and the air container 29 is connected to the micro-pressure tee connector 30.

[0054] The pressure interface component 032 also includes a positive pressure gauge interface 17, a pressure gauge sensor 32, and a negative pressure gauge interface 18 connected in sequence. Pressure gauge filters 34 are respectively provided between the positive pressure gauge interface 17 and the pressure gauge sensor 32, and between the negative pressure gauge interface 18 and the pressure gauge sensor 32.

[0055] In practical use, the positive micro-pressure interface 15 or the negative micro-pressure interface 16 is connected to the tee connector II via a pipeline, forming a connection loop with the instrument to be calibrated and the pressurization interface 14. When the pressure generating module 031 performs micro-pressure adjustment, the gas in the pipeline enters the micro-pressure detection branch through the positive micro-pressure interface 15 or the negative micro-pressure interface 16. Since the micro-pressure is easily affected by factors such as gas flow and pipeline vibration, the gas container 29 connected to the micro-pressure tee connector 30 can play a buffering and stabilizing role. Through the gas storage and release in the internal cavity of the gas container 29, the instantaneous pressure fluctuation in the pipeline is offset, ensuring that the gas pressure entering the micro-pressure sensor 33 is stable, avoiding distortion of sensor detection data due to pressure fluctuations, and improving the stability and accuracy of micro-pressure measurement.

[0056] Meanwhile, the micro-pressure filter 31 is respectively set between the micro-pressure positive interface 15 and the micro-pressure sensor 33, and between the micro-pressure negative interface 16 and the micro-pressure sensor 33, which can filter the gas entering the detection branch and effectively intercept impurities such as dust, oil, and water vapor contained in the gas.

[0057] When the device performs routine pressure calibration or high flow measurement on the instrument being calibrated, the gauge pressure interface sub-assembly replaces or works in conjunction with the micro-pressure interface sub-assembly, acquiring gauge pressure signals within the pipeline through the gauge pressure positive interface 17 and gauge pressure negative interface 18. The gauge pressure sensor 32 is adapted for gauge pressure measurement scenarios, offering higher detection accuracy and faster response speed within the normal pressure range. It can accurately capture the dynamic changes in pipeline gauge pressure during pressurization and depressurization by the pressure generating module 031, providing real-time and accurate pressure feedback signals for the stroke adjustment of the linear slide motion assembly 25, ensuring that the pressure generating module 031 can quickly and stably reach the preset pressure value.

[0058] In addition, the setting of the gauge pressure filter 34 echoes the function of the micro pressure filter 31, and undertakes the function of impurity filtration in the gauge pressure detection branch.

[0059] The pressure interface component 032 achieves full coverage detection of the pressure range through the coordinated operation of the micro-pressure detection branch and the gauge pressure detection branch, adapting to different pressure scenarios within the ±50Kpa pressure adjustment range of the pressure generation module 031.

[0060] In some embodiments of this application, the measurement range of the micro-pressure sensor 33 is ±10 kPa, and the measurement range of the gauge pressure sensor 32 is ±100 kPa.

[0061] In some embodiments of this application, reference is made to Figure 2 The multi-parameter gas flow calibration device also includes a communication interface 6, which is configured to connect and communicate with an external gas flow calibration device to obtain gas flow calibration parameters. The external gas flow calibration device may be, for example, a Roots flow meter or a soap film flow meter.

[0062] In some embodiments of this application, the multi-parameter gas flow calibration device further includes a flue gas temperature calibration interface 10, which is configured to connect to the instrument being calibrated for temperature calibration. Flue gas temperature calibration eliminates instrument errors by comparing with a standard reference value, ensuring that the measured gas temperature value is consistent with the actual value, and avoiding the impact of temperature deviations on the calculation of pollutant emissions.

[0063] In some embodiments of this application, reference is made to Figures 1 to 4The multi-parameter gas flow calibration device includes a housing 41. A high-flow-rate inlet port 7 and a high-flow-rate outlet port 13 are disposed on the housing 41, and a high-flow-rate laminar flow meter 24 is disposed within the inner cavity of the housing 41. A low-flow-rate inlet port 8 and a low-flow-rate outlet port 12 are disposed on the housing 41, and a low-flow-rate laminar flow meter 36 is disposed within the inner cavity of the housing 41. A pressure interface component 032 is disposed on the housing 41, a pressure generating module 031 is disposed within the inner cavity of the housing 41, and a pressurization interface 14 of the pressure generating module 031 is disposed on the housing 41.

[0064] Specifically, refer to Figure 2 The left side wall of the housing 41 is provided with a communication interface 6, a large flow air intake interface 7, four small flow air intake interfaces 8, and a USB interface 9.

[0065] Reference Figure 3 The right side wall of the housing 41 is provided with a large flow air outlet 13, four small flow air outlets 12, a smoke temperature calibration interface 10, an automatic calibration interface 11, a micro pressure positive interface 15, a micro pressure negative interface 16, a gauge pressure positive interface 17, a gauge pressure negative interface 18, a pressurization interface 14, and an automatic calibration interface 11.

[0066] Reference Figure 1 The front of the housing 41 is equipped with a display screen 1, a power switch 2, a voice module output port 3, and a status indicator light 5. The display screen 1 is a touch screen for easy user operation and observation. The status indicator light 5 is a multi-color ambient light strip that can change color according to different working states.

[0067] Reference Figure 4 The back of the housing 41 is provided with a handle 19, a charging port 20, a charging indicator light 21, and a heat dissipation vent 22.

[0068] The multi-parameter gas flow calibration device of this application has the following technical advantages: This device innovatively uses a high-precision, wide-range laminar flow meter as the flow calibration element, which has a fast measurement response speed. It covers the entire flow range of a single sampler with a single interface, simplifying the calibration process. It is also divided into multiple gas paths, which can simultaneously perform gas flow calibration for multiple instruments, improving work efficiency and calibration stability. The wide-range design avoids the trouble of frequently changing calibration components, and the unified control interface of the single unit simplifies operation, reducing the technical threshold for users and the equipment purchase and maintenance costs. This highly integrated device can simultaneously and accurately calibrate gas flow, temperature, and pressure with a single unit, integrating previously separate functions into one, greatly improving calibration efficiency and convenience. An external communication interface enables communication with external calibration devices (such as Roots flow meters and soap film flow meters), allowing real-time acquisition of gas flow calibration parameters and building a flexible, open, and scalable calibration platform. By integrating gas flow, temperature, and pressure calibration functions, it achieves simultaneous and accurate measurement of multiple parameters, enabling a single unit to complete tasks that previously required multiple devices, significantly improving calibration efficiency. This device employs a linear slide table driven by a stepper motor as a precision pressure control mechanism. Through stepless adjustment of the pulse frequency, it precisely controls the cylinder piston rod speed, thereby achieving linear regulation of pipeline pressure. Innovatively, a specific opening and closing combination of two normally closed DC solenoid valves, precisely coordinated with the slide table movement, forms a programmable automatic pressurization / depressurization logic, ensuring process reliability and repeatability. An integrated slotted optocoupler and light-shielding plate constitute a non-contact position feedback system, realizing position-based closed-loop stroke control, stably outputting a wide pressure range of up to ±50KPa within a stroke of 65–70mm. Simultaneously, the movable joint effectively compensates for installation errors; vibration damping pads suppress vibration and noise, jointly ensuring the module's long-term stability and durability. The pressure generation module, through precise control of a stepper motor, achieves high-precision, wide-range automatic pressure generation and stable maintenance, significantly improving calibration accuracy and applicability. Its fully automatic "one-button" operation eliminates the need for traditional manual adjustment, greatly simplifying operation, shortening calibration time, and effectively improving work efficiency. At the same time, the module's closed-loop stroke control, movable joint, and normally closed solenoid valve design jointly ensure the system's mechanical life, long-term operational stability, and safety, fundamentally solving the pain point of traditional solutions that require independent, manual equipment for pressure calibration. To address the issue that traditional calibration devices require manual monitoring of the display screen to perceive their operating status, this device integrates a voice prompt module and a multi-color status indicator bar. Through sound and light coordinated alarms, it achieves intuitive and remote perception of the operating status.

[0069] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0070] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A multi-parameter gas flow rate calibration device, characterized in that, Including: case; A high-flow-rate measurement module includes a high-flow-rate inlet port, a high-flow-rate outlet port, and a high-flow-rate laminar flow meter. The high-flow-rate laminar flow meter is connected to a first pressure sensor and a first differential pressure sensor. The high-flow-rate inlet port and the high-flow-rate outlet port are disposed on the housing, and the high-flow-rate laminar flow meter is disposed in the inner cavity of the housing. The low-flow measurement module includes a low-flow air inlet, a low-flow air outlet, and a low-flow laminar flow meter. The low-flow laminar flow meter is connected to a second pressure sensor and a second differential pressure sensor. The low-flow air inlet and the low-flow air outlet are disposed on the housing, and the low-flow laminar flow meter is disposed in the inner cavity of the housing. The pressure measurement module includes a pressure generating module and a pressure interface. The pressure interface is disposed on the housing, the pressure generating module is disposed in the inner cavity of the housing, and the pressurization interface of the pressure generating module is disposed on the housing. The pressurization interface is connected to the pressure interface and the instrument to be calibrated via a three-way connector II. A smoke temperature calibration interface is provided on the housing, and the smoke temperature calibration interface is configured to connect to the instrument being calibrated for temperature calibration.

2. The multi-parameter gas flow calibration device according to claim 1, characterized in that, The high-flow laminar flow meter includes a first housing, with a first air inlet at one end and a first air outlet at the other opposite end. A laminar flow vane assembly is disposed in the inner cavity of the first housing, with an air inlet rectifier at the air inlet end and an air outlet rectifier at the air outlet end of the laminar flow vane assembly. A first temperature measuring plate and a first pressure tap are also disposed on the first housing.

3. The multi-parameter gas flow calibration device according to claim 1, characterized in that, The small-flow laminar flow meter includes a second housing, with a second air inlet at one end and a second air outlet at the other opposite end. A laminar flow plate assembly is provided in the inner cavity of the second housing, and a second temperature plate and a second pressure tap are also provided on the second housing.

4. The multi-parameter gas flow calibration device according to claim 1, characterized in that, An air intake filter is provided between the high-flow-rate air intake port and the high-flow-rate laminar flow meter, and a filter is provided between the low-flow-rate air intake port and the low-flow-rate laminar flow meter.

5. The multi-parameter gas flow calibration device according to claim 1, characterized in that, The flow range of the high-flow laminar flow meter is (2-230) L / min, and the range ratio reaches 115:1; The flow rate range of the small laminar flow meter is (10-2000) ml / min, and the range ratio reaches 200:

1.

6. The multi-parameter gas flow calibration device according to claim 1, characterized in that, The pressure interface consists of a micro-pressure positive interface, a micro-pressure tee connector, a micro-pressure sensor, and a micro-pressure negative interface connected in sequence, and the micro-pressure tee connector is connected to a gas container. The pressure interface also includes a positive gauge pressure interface, a gauge pressure sensor, and a negative gauge pressure interface connected in sequence.

7. The multi-parameter gas flow calibration device according to claim 6, characterized in that, The measurement range of the micro-pressure sensor is ±10 kPa, and the measurement range of the gauge pressure sensor is ±100 kPa.

8. The multi-parameter gas flow rate calibration device according to any one of claims 1 to 7, characterized in that, The housing is provided with a communication interface, which is configured to connect to an external gas flow calibration device.

9. The multi-parameter gas flow rate calibration device according to any one of claims 1 to 7, characterized in that, A display screen is provided on the housing.

10. The multi-parameter gas flow rate calibration device according to any one of claims 1 to 7, characterized in that, The low-flow measurement module includes multiple gas paths connected in parallel.

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