A flow rate tube and digital handle

Abstract

This application discloses a flow velocity tube, comprising: a tube body, which is a hollow tubular structure, comprising an inlet section, a contraction section, a measuring section, and a diffusion section in sequence along the fluid flow direction, wherein the inner cavities of the inlet section, contraction section, measuring section, and diffusion section are connected to form a main channel for fluid flow; a measuring element disposed in the measuring section of the tube body, the measuring element having a front end face facing the inlet section and a rear end face facing away from the inlet section, the front end face having a total pressure tapping hole, and the rear end face or outer peripheral wall having a static pressure tapping hole; wherein, the measuring element has an independent and parallel extending total pressure channel and a static pressure channel inside, the total pressure channel being connected to the total pressure tapping hole and extending to the outside of the measuring element to connect to a pressure sensor, the static pressure channel being connected to the static pressure tapping hole and extending to the outside of the measuring element to connect to a pressure sensor, the total pressure channel and the static pressure channel transmitting total pressure signal and static pressure signal respectively, for calculating the pressure difference or flow rate of the fluid.

Description

Technical Field

[0001] This application relates to the field of measurement technology, and more particularly to a flow rate tube and a digital handle. Background Technology

[0002] In the field of fluid flow measurement (such as industrial pipeline fluid monitoring, medical respiratory airflow detection, and environmental gas sampling), specialized equipment is needed to collect fluid pressure parameters to calculate flow velocity and flow rate. The velocity tube is one of the core measurement components, and its development can be roughly divided into three stages: Early velocity tubes were mostly single, straight pipe sections, collecting pressure parameters only through simple pressure taps on the sidewall of the pipe. They did not consider the influence of fluid flow characteristics on the measurement, resulting in turbulent flow fields and significant measurement errors. They were only suitable for coarse measurement scenarios with extremely low accuracy requirements (such as rough flow estimation in industrial pipelines); with the development of fluid mechanics theory, velocity tubes with simple variable diameter structures (such as those with only a receiving port) appeared. While some flow tubes (including inlet, measuring, and outlet sections) attempt to adjust the flow field by changing the channel cross-section, the lack of segmented collaborative design leads to vortices at the diameter change points, and the pressure tapping positions are not matched with the optimal flow field region, failing to solve the problem of unstable pressure acquisition and making it difficult to meet the needs of medium- to high-precision measurements (such as basic airflow detection in medical equipment). Although existing technologies have begun to focus on the integration of tube segment design with measuring elements, significant defects still exist: some flow tubes, although containing inlet, measuring, and outlet sections, lack dedicated contraction and diffusion sections, resulting in poor flow field rectification; and some, although designed with segmented structures, have unreasonable designs for the pressure tapping and transmission channels of the measuring elements, further restricting measurement accuracy. Utility Model Content

[0003] One object of this application is to provide a flow tube and a digital handle, at least to solve the above-mentioned problems.

[0004] To achieve the above objectives, some embodiments of this application provide a flow rate tube, comprising:

[0005] The tube body is a hollow tubular structure. Along the fluid flow direction, the tube body includes an inlet section, a contraction section, a measuring section, and a diffusion section. The inner cavities of the inlet section, contraction section, measuring section, and diffusion section are connected to form the main channel for fluid flow.

[0006] The measuring element is set in the measuring section of the pipe body. The measuring element has a front end face facing the inlet section and a rear end face away from the inlet section. The front end face is provided with a total pressure tapping hole, and the rear end face or the outer peripheral wall is provided with a static pressure tapping hole.

[0007] The measuring element has an independent and parallel total pressure channel and a static pressure channel inside. The total pressure channel is connected to the total pressure tap and extends to the outside of the measuring element to connect to the pressure sensor. The static pressure channel is connected to the static pressure tap and extends to the outside of the measuring element to connect to the pressure sensor. The total pressure signal and static pressure signal are transmitted through the total pressure channel and the static pressure channel respectively to calculate the pressure difference or flow rate of the fluid.

[0008] Some embodiments of this application also provide a digital handle, including a handle assembly and the flow tube described above, the flow tube being detachably connected to the handle assembly; the handle assembly includes: a handle cover enclosing a receiving cavity in which a pressure sensor is installed; and a fixing cover connected to the handle cover, the fixing cover being used to detachably fix the flow tube.

[0009] Compared with related technologies, the solution provided in this application embodiment uses a segmented design of an inlet section, a contraction section, a measurement section, and a diffusion section to form a main channel that conforms to the laws of fluid mechanics. The contraction section can accelerate and rectify the fluid, while the diffusion section can reduce the fluid velocity to reduce energy loss, providing a stable flow field environment for accurate measurement. The total pressure tap on the front face of the measuring element and the static pressure tap on the rear face / outer peripheral wall collect the total pressure and static pressure respectively. Combined with the internal independent parallel total pressure channel and static pressure channel, the two pressure signals can avoid mutual interference during transmission, ensuring the accuracy of pressure signal transmission. The pressure signal is transmitted to an external pressure sensor through an independent channel, realizing the direct acquisition of fluid pressure parameters without the need for complex conversion structures, simplifying the measurement process, and improving the usability and measurement efficiency of the velocity tube. Attached Figure Description

[0010] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0011] Figure 1 This is a cross-sectional schematic diagram of the flow tube provided in an embodiment of this disclosure;

[0012] Figure 2 This is a schematic diagram of the flow tube provided in an embodiment of this disclosure;

[0013] Figure 3 This is a schematic diagram of the flow tube from another perspective, provided in an embodiment of this disclosure;

[0014] Figure 4 This is a schematic diagram of the flow tube from another perspective, provided in an embodiment of this disclosure;

[0015] Figure 5This is a cross-sectional schematic diagram of the flow tube provided in an embodiment of this disclosure from another perspective;

[0016] Figure 6 This is a schematic diagram of the structure of the digital handle provided in an embodiment of this disclosure;

[0017] Figure 7 This is a structural schematic diagram of the digital handle provided in an embodiment of this disclosure from another perspective;

[0018] Figure 8 This is an exploded view of the flow tube, the snap-fit ​​component, and the bottom inner shell provided in the embodiments of this disclosure;

[0019] Figure 9 This is a structural schematic diagram of the digital handle provided in an embodiment of this disclosure from another perspective.

[0020] Figure label:

[0021] 10: Tube body; 101: Inlet section; 102: Contraction section; 103: Measurement section; 104: Diffusion section; 105: Advection section; 106: Main channel; 107: Sample collection port; 108: Sampling channel; 109: Absolute pressure collection port; 110: Pressure channel;

[0022] 20: Measuring element; 201: Total pressure tap; 202: Static pressure tap; 203: Total pressure channel; 204: Static pressure channel; 30: Grille; 40: Mounting base;

[0023] 50: Handle cover; 501: Receiving cavity; 502: Mounting bracket;

[0024] 601: Base; 602: Inner shell; 6021: First receiving groove; 6022: Hollowed-out part; 603: Top cover; 6031: Second receiving groove; 604: Snap-fit ​​component; 605: Sealing gasket;

[0025] 70: Pressure sensor. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, 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, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0028] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this disclosure according to the specific circumstances.

[0029] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0030] Unless otherwise stated, the term "multiple" means two or more.

[0031] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0032] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0033] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0034] Combination Figures 1 to 9As shown in the embodiment of this disclosure, a flow velocity tube includes: a tube body 10, which is a hollow tubular structure, the tube body 10 including an inlet section 101, a contraction section 102, a measuring section 103 and a diffuser section 104 in sequence along the fluid flow direction, the inner cavities of the inlet section 101, the contraction section 102, the measuring section 103 and the diffuser section 104 are connected to form a main channel 106 for fluid flow; a measuring element 20, disposed in the measuring section 103 of the tube body 10, the measuring element 20 having a front end face facing the inlet section 101 and a rear end face away from the inlet section 101, the front end face having a total pressure tap. The pressure port 201 has a static pressure tapping port 202 on its rear end face or outer peripheral wall. The measuring element 20 has an independent and parallel total pressure channel 203 and a static pressure channel 204 inside. The total pressure channel 203 is connected to the total pressure tapping port 201 and extends to the outside of the measuring element 20 to connect to the pressure sensor 70. The static pressure channel 204 is connected to the static pressure tapping port 202 and extends to the outside of the measuring element 20 to connect to the pressure sensor 70. The total pressure signal and the static pressure signal are transmitted through the total pressure channel 203 and the static pressure channel 204 respectively, which are used to calculate the pressure difference or flow rate of the fluid.

[0035] Using the velocity tube provided in this embodiment, the tube body 10 forms a main channel 106 that conforms to the laws of fluid mechanics through a segmented design of an inlet section 101, a contraction section 102, a measuring section 103, and a diffusion section 104. The contraction section 102 can accelerate and rectify the fluid, while the diffusion section 104 can reduce the fluid velocity to reduce energy loss, providing a stable flow field environment for accurate measurement. The total pressure tap 201 on the front end face of the measuring element 20 and the static pressure tap 202 on the rear end face / outer peripheral wall collect the total pressure and static pressure, respectively. Combined with the internal independent parallel total pressure channel 203 and static pressure channel 204, mutual interference between the two pressure signals can be avoided during transmission, ensuring the accuracy of pressure signal transmission. The pressure signal is transmitted to the external pressure sensor 70 through independent channels, realizing the direct acquisition of fluid pressure parameters without the need for complex conversion structures, simplifying the measurement process, and improving the usability and measurement efficiency of the velocity tube.

[0036] Optionally, the fluid flow direction in the main channel 106 is along the axis of the pipe body 10, flowing from the inlet section 101 to the diffuser section 104. This ensures that the fluid flow path in the pipe body 10 is compatible with the segmented structure of the pipe body 10 (inlet section 101 - contraction section 102 - measurement section 103 - diffuser section 104), avoiding flow field instability due to chaotic fluid flow direction, and ensuring the normal functioning of the contraction section 102, measurement section 103, and diffuser section 104 (acceleration rectification, pressure acquisition, speed reduction and loss reduction).

[0037] Optionally, the axis of the pipe body 10 is the central axis of its main channel 106. Aligning the axis of the pipe body 10 with the central axis of the main channel 106 ensures that the inner walls of each section of the pipe body 10 (inlet section 101, contraction section 102, measurement section 103, and diffuser section 104) are symmetrically distributed around the center of the main channel 106. This prevents directional flow due to channel eccentricity, reduces flow field disturbance, and ensures uniform velocity distribution of the fluid in the measurement section 103. This provides symmetrical and stable flow field conditions for the measuring element 20 to accurately acquire total pressure and static pressure, thus improving pressure acquisition accuracy.

[0038] Optionally, the contraction section 102 is a tapered pipe section that gradually narrows from the inlet section 101 to the measuring section 103 along the axial direction of the pipe body 10; and / or, the diffusion section 104 is a tapered pipe section that gradually widens from the measuring section 103 away from the inlet section 101 along the axial direction of the pipe body 10.

[0039] The conical structure that gradually narrows from the inlet section 101 to the measuring section 103 along the axial direction can accelerate the incoming fluid by gradient, so that the fluid forms a stable flow field with a certain velocity before entering the measuring section 103, avoiding flow field turbulence caused by sudden changes in fluid velocity, and making it easier for the measuring element 20 to collect a stable pressure signal.

[0040] The conical structure that gradually widens from the measuring section 103 away from the inlet section 101 along the axial direction can decelerate the fluid passing through the measuring section 103, reduce the energy loss caused by the fluid's excessive flow velocity, and at the same time reduce the vortex phenomenon at the outlet of the pipe body 10, avoid the reverse interference of the vortex on the flow field of the upstream measuring section 103, and ensure the stability of the overall flow field.

[0041] Optionally, the measuring section 103 is a straight pipe section connected between the contraction section 102 and the diffusion section 104.

[0042] The measuring section 103 is set as a straight pipe section connecting the contraction section 102 and the diffusion section 104, so that after the fluid is accelerated through the contraction section 102, it can form a uniform and stable laminar flow state in the measuring section 103, avoiding fluid velocity fluctuations caused by irregular channel shape; the straight channel structure also facilitates the fixed installation of the measuring element 20, ensuring that the pressure tap position of the measuring element 20 is accurate and maintains a preset angle with the fluid flow direction, improving the accuracy and consistency of pressure acquisition.

[0043] Optionally, the taper of the contraction section 102 is 30°-60°, the taper of the diffusion section 104 is 30°-60°, and the minimum inner diameter of the contraction section 102 is consistent with the inner diameter of the measurement section 103, and the maximum inner diameter of the diffusion section 104 is not less than the inner diameter of the inlet section 101.

[0044] The tapered design of the contraction section 102 and the diffusion section at 30°-60° ensures the acceleration / deceleration effect of the fluid while avoiding the separation phenomenon (turbulence) caused by excessive tapering on the inner wall of the channel, or the excessively low acceleration / deceleration efficiency and excessively long flow field stabilization time caused by excessively small tapering, thus balancing the stability of the flow field and the efficiency of flow velocity regulation.

[0045] The minimum inner diameter of the contraction section 102 is consistent with the inner diameter of the measurement section 103, ensuring that there is no step-like abrupt change when the fluid enters the measurement section 103 from the contraction section 102, and avoiding flow field disturbance caused by abrupt change in the inner diameter of the channel; the maximum inner diameter of the diffuser section 104 is not less than the inner diameter of the inlet section 101, which allows the fluid after deceleration through the diffuser section 104 to be discharged smoothly, reducing the flow resistance at the outlet and further reducing the risk of flow field turbulence.

[0046] Optionally, the pipe body 10 also includes a laminar flow section 105 connected to the diffuser section 104, the laminar flow section 105 being located on the side of the diffuser section 104 away from the measuring section 103; wherein, the laminar flow section 105 is a straight pipe section.

[0047] A straight advection section 105 is added to the side of the diffuser section 104 away from the measuring section 103. This can further rectify the fluid after it has been decelerated by the diffuser section 104, so that the fluid forms a more stable flow field before it exits the pipe body 10. This prevents the fluid disturbance at the outlet of the diffuser section 104 from affecting the flow field stability of the upstream measuring section 103. At the same time, the straight structure of the advection section 105 also facilitates the connection between the pipe body 10 and the external pipeline, improving the installation adaptability of the velocity pipe.

[0048] Optionally, the measuring element 20 is a flat component. The flat surface of the measuring element 20 is parallel to the fluid flow direction in the main channel 106, and the axis of the measuring element 20 is perpendicular to the axis of the pipe body 10. The flat shape of the measuring element 20 can reduce its cross-sectional size in the main channel 106, reduce the obstruction to fluid flow, and reduce eddies caused by the component obstruction. The arrangement of the flat surface parallel to the fluid flow direction and the axis perpendicular to the axis of the pipe body 10 allows the measuring element 20 to be arranged along the fluid flow direction, further reducing flow resistance. At the same time, this orientation ensures that the total pressure tap 201 on the front face is directly facing the fluid flow direction, which meets the hydrodynamic requirements of total pressure acquisition and improves the accuracy of total pressure acquisition.

[0049] Optionally, the ratio of the thickness dimension of the measuring element 20 along the radial direction of the tube body 10 to the width dimension along the axial direction of the tube body 10 is 1:3 to 1:10.

[0050] The thickness-to-width ratio design of 1:3 to 1:10 further optimizes the flat structure of the measuring element 20. While ensuring the structural strength of the element (providing sufficient support in the width direction), it minimizes the size in the thickness direction, reduces the obstruction area for fluid flow, and reduces flow field disturbance. This ratio also facilitates the processing of independent total pressure channels 203 and static pressure channels 204 inside the element, taking into account both structural practicality and flow field adaptability.

[0051] Optionally, both ends of the measuring element 20 are fixed to the inner wall of the measuring section 103, and a gap is left between the outer peripheral wall of the measuring element 20 and the inner wall of the measuring section 103 to allow fluid flow. Fixing both ends of the measuring element 20 to the inner wall of the measuring section 103 ensures that the element will not shift or shake under fluid impact, ensuring the stability of the positions of the total pressure tap 201 and the static pressure tap 202, and avoiding deviations in pressure acquisition data due to movement of the measuring element 20. The gap between the outer peripheral wall of the measuring element 20 and the inner wall of the measuring section 103 allows the fluid to flow smoothly around the measuring element 20, avoiding flow field turbulence due to channel blockage, and ensuring the overall stability of the fluid flow within the measuring section 103.

[0052] Optionally, the measuring element 20 and the measuring section 103 are fixed by welding, threaded connection, fixed connection or integral molding.

[0053] Optionally, the opening direction of the total pressure tap 201 is consistent with the fluid flow direction in the main channel 106, so as to form a stagnation point at the total pressure tap 201 and collect the total fluid pressure.

[0054] The opening direction of the total pressure tap 201 is consistent with the fluid flow direction, which allows the fluid to form a stagnation point (the fluid velocity drops to zero) at the total pressure tap 201. The pressure collected at this time is the total pressure of the fluid (stagnation point pressure), which meets the principle requirements of total pressure collection in fluid mechanics. This avoids the inclusion of velocity components in the collected pressure due to deviation of the opening direction, ensuring the accuracy of the total pressure data and providing accurate basic data for subsequent differential pressure and flow rate calculations.

[0055] Optionally, the front end face of the total pressure tap 201 is flush with the outlet end of the contraction section 102 of the pipe body 10, or located within the contraction section 102; and / or, the rear end face of the static pressure tap 202 is flush with the inlet end of the diffusion section 104 of the pipe body 10, or located within the diffusion section 104.

[0056] The total pressure tap 201 is flush with the outlet end of the contraction section 102 or located inside the contraction section 102 (i.e., the total pressure tap 201 extends slightly beyond the measuring section 103 and is located inside the contraction section 102). It can collect the total pressure after the fluid accelerates through the contraction section 102, before entering the measuring section 103, or just after entering the measuring section 103. At this time, the fluid has completed the initial rectification and the flow rate is stable, so more accurate total pressure data can be obtained.

[0057] The static pressure tap 202 is positioned flush with or within the inlet of the diffuser section 104 (i.e., the static pressure tap 202 extends slightly beyond the measuring section 103 and is located within the diffuser section 104). This allows for the collection of static pressure data after the fluid has passed through the measuring section 103, before it decelerates upon entering the diffuser section 104, or just as it enters the diffuser section 104. At this time, the fluid has formed a stable flow field within the measuring section 103, and the static pressure is evenly distributed, ensuring the accuracy of static pressure data collection. The combination of these two positions further improves the calculation accuracy of the difference between total pressure and static pressure.

[0058] Optionally, a sample collection hole 107 is provided on the side wall of the measuring section 103. The sample collection hole 107 is connected to a gas analyzer through a sampling channel 108 extending to the outside of the tube body 10 for collecting fluid samples.

[0059] A sample collection hole 107 is opened on the side wall of the measuring section 103, and a gas analyzer is connected through the sampling channel 108. This allows the flow tube to simultaneously collect fluid samples for composition analysis while measuring fluid pressure difference / flow rate, realizing the integrated function of "flow measurement and sample analysis". There is no need to set up an additional independent sample collection device, which simplifies the equipment structure, improves detection efficiency, and is suitable for scenarios that require simultaneous acquisition of fluid flow rate and composition information (such as gas detection and fluid quality monitoring).

[0060] Optionally, the pipe wall of the measuring section 103 is also provided with an absolute pressure acquisition hole 109. The absolute pressure acquisition hole 109 is connected to the pressure sensor 70 through a pressure channel 110 extending to the outside of the pipe body 10, and is used to acquire the absolute pressure of the fluid.

[0061] By connecting the pressure sensor 70 to the pressure channel 110 through the absolute pressure acquisition port 109, the absolute pressure data of the fluid can be acquired. Combined with the previously acquired total pressure and static pressure data, the pressure parameters of the fluid can be more comprehensively understood. At the same time, the absolute pressure data can be used as an auxiliary parameter for flow calculation, further improving the accuracy of flow calculation.

[0062] Optionally, the sample acquisition port 107 and the absolute pressure acquisition port 109 are located on both sides of the measuring element 20 and are distributed radially along the tube body 10. The location of the sample acquisition port 107 and the absolute pressure acquisition port 109 on both sides of the measuring element 20 avoids mutual interference during acquisition, ensuring independent and stable operation of the two acquisition functions. The radial distribution along the tube body 10 fully utilizes the radial space of the measuring section 103, avoiding excessive space occupation in the axial direction that could lead to a crowded channel layout.

[0063] Optionally, it also includes: a grid 30, which is a mesh-like component located at the end of the inlet section 101 of the pipe body 10. It is formed by connecting multiple sets of mutually perpendicular grid bars to form a regular grid channel, which can pre-rectify the fluid entering the pipe body 10, filter large particulate impurities in the fluid (to avoid impurities clogging the main channel 106 or damaging the measuring element 20), and break the irregular eddies of the fluid, so that the fluid enters the inlet section 101 in a more uniform and stable state.

[0064] Optionally, it also includes: a mounting base 40, which is disposed along the outer circumferential surface of the measuring section 103 of the pipe body 10 and corresponds to the position of the measuring element 20; wherein the total pressure channel 203, the static pressure channel 204, the sampling channel 108 of the sample collection port 107, and the pressure channel 110 of the absolute pressure collection port 109 of the measuring element 20 all pass through the mounting base 40 for connection with the external pressure sensor 70 or analyzer, realizing integrated management of each channel, avoiding pipeline chaos caused by the dispersed arrangement of channels, and facilitating subsequent connection with external sensors or analyzers. The mounting base 40 provides a unified connection interface position for external devices, eliminating the need to directly process complex connection structures on the pipe body 10, simplifying the processing technology of the pipe body 10, while improving the convenience and stability of external pipeline connection and reducing the risk of installation errors.

[0065] Optionally, the end face of the mounting base 40 facing away from the pipe body 10 is trapezoidal to guide the installation angle and position. The trapezoidal end face can serve as a visual and physical guide structure during installation. Operators can determine the orientation and angle of the mounting base 40 by the hypotenuse or base of the trapezoid, quickly locate the connection position of external sensors or pipelines, avoid misalignment of channels due to installation angle deviation, improve installation efficiency and connection accuracy, and are especially suitable for rapid on-site installation scenarios.

[0066] Optionally, the outer ends of the total pressure channel 203, static pressure channel 204, sampling channel 108 of sample acquisition port 107, and pressure channel 110 of absolute pressure acquisition port 109 are provided with threaded interfaces or quick-connect fittings for sealed connection with the pipeline of pressure sensor 70 or analyzer. The threaded interfaces or quick-connect fittings can accommodate different types of external pressure sensor 70 or analyzer pipelines: threaded interfaces provide high-strength, sealed connections, suitable for high-pressure or long-term stable connections; quick-connect fittings allow for rapid insertion and removal, improving equipment disassembly and maintenance efficiency.

[0067] This disclosure also discloses a digital handle, including a handle assembly and the aforementioned flow tube, the flow tube being detachably connected to the handle assembly; the handle assembly includes: a handle cover 50, enclosing a receiving cavity 501, the receiving cavity 501 having a pressure sensor 70 installed therein; and a fixing cover, connected to the handle cover 50, the fixing cover being used to detachably fix the flow tube.

[0068] The flow tube and the handle assembly are detachably connected, allowing them to be processed, maintained, or replaced separately (e.g., if the flow tube is damaged, only the flow tube needs to be replaced, without replacing the entire handle), reducing usage and maintenance costs. At the same time, different specifications of flow tubes (e.g., measuring sections 103 with different diameters) can be replaced according to measurement needs, expanding the applicability of the digital handle.

[0069] The pressure sensor 70 and circuit board are installed in the handle housing 50 of the handle assembly and the cavity 501, realizing the integrated integration of "measuring element 20 (flow tube) and signal acquisition (pressure sensor 70)", eliminating the need for additional external independent sensors, simplifying the overall structure of the device, improving portability, and making it suitable for mobile measurement scenarios (such as on-site detection and handheld operation).

[0070] The fixed cover is specifically designed for detachable and fixed flow tubes, ensuring that the flow tubes do not shift during measurement (such as when shaking during hand operation), guaranteeing the relative position of the pressure tap and the sensor is stable, avoiding pressure signal transmission deviations due to loose flow tubes, and improving measurement accuracy.

[0071] In this embodiment, the pressure sensor functions, including but not limited to, measuring the pressure difference between the total pressure channel and the static pressure channel, and measuring the absolute pressure value of the pressure channel.

[0072] Optionally, the handle cover 50 has a sensor mounting bracket 502 extending axially inside the receiving cavity 501. The bracket has a mounting groove that matches the shape of the pressure sensor 70 and the differential pressure sensor. The inner wall of the mounting groove has conductive contacts. The sensor abuts against the conductive contacts to achieve electrical connection. The bottom of the bracket has heat dissipation fins.

[0073] The mounting slots on the bracket, which are adapted to the shape of the sensors, can accurately position the pressure sensor 70 and the differential pressure sensor, avoiding signal acquisition deviations caused by sensor installation misalignment; the conductive contacts on the inner wall abut against the sensor to achieve electrical connection, eliminating the need for additional soldered wires, simplifying the sensor installation process, and reducing the risk of circuit connection failures.

[0074] The heat dissipation fins at the bottom of the bracket can increase the heat dissipation area, quickly conduct the heat generated by the sensor during operation to the air, avoid performance drift caused by overheating (such as a decrease in pressure detection accuracy), ensure long-term stable operation of the sensor, and improve the reliability and service life of the digital handle.

[0075] Optionally, the inner wall of the receiving cavity 501 of the handle cover 50 is provided with a cable slot extending along the axis for fixing the cable connecting the sensor to the external device, and the outlet end of the cable slot is provided with a waterproof sealing ring.

[0076] The axially extending cable slot can firmly fix the cable connecting the sensor to the external device, preventing the cable from becoming loose or tangled when the handle is moved or shaken (such as poor contact between the cable and the sensor interface), thus ensuring stable signal transmission.

[0077] The waterproof sealing ring at the cable slot outlet can prevent external moisture (such as water stains or humid air during on-site testing) from entering the receiving cavity 501, avoiding moisture damage to the sensor or causing a short circuit, improving the waterproof performance of the digital handle, and making it suitable for humid or outdoor environments.

[0078] Optionally, the fixed cover includes: a base 601, which is a semi-circular component located on the top of the handle cover 50 and has a through opening communicating with the receiving cavity 501 of the handle cover 50; and a bottom inner shell 602, which is detachably connected to the base 601 and defines a first receiving groove 6021 that is adapted to the shape of the flow tube. The bottom wall of the first receiving groove 6021 has a hollow portion 6022, which is used to avoid the mounting seat 40 of the flow tube, so that the connecting pipe or quick connector can be connected to the total pressure channel 203, static pressure channel 204, sampling channel 108 of the sample collection hole 107, and pressure channel 110 of the absolute pressure collection hole 109 through the mounting seat 40.

[0079] A semi-circular base 601 is located on the top of the handle cover 50, and its through-hole enables the channel connection between the receiving cavity 501 (sensor) and the flow tube (such as the total pressure channel 203, static pressure channel 204 and sensor interface), providing a channel for pressure signal transmission; the semi-circular structure adapts to the shape of the handle cover 50, improving the fit and stability of the connection between the fixed cover and the handle cover 50.

[0080] The first receiving groove 6021 of the bottom inner shell 602, which is detachably connected to the base 601 and adapted to the shape of the flow tube, can accurately position and initially fix the flow tube, ensuring that the mounting seat 40 of the flow tube is aligned with the hollow part 6022; the hollow part 6022 avoids the mounting seat 40, providing operating space for connecting pipes or quick connectors, preventing the bottom inner shell 602 from blocking the channel docking, and ensuring the normal connection between the flow tube and the sensor.

[0081] Optionally, the fixed cover also includes: an upper cover 603, which snaps into the base 601 or the inner shell 602, the upper cover 603 defining a second receiving groove 6031 that is adapted to the shape of the flow tube, for limiting and fixing the flow tube.

[0082] The upper cover 603 is snapped into the base 601 / bottom inner shell 602. Its second receiving groove 6031 cooperates with the first receiving groove 6021 to form a complete flow tube fixing space, which limits and fixes the flow tube from the upper and lower sides, further improving the fixing stability of the flow tube and preventing the flow tube from moving up and down during the measurement process. The snap-fit ​​structure facilitates the quick disassembly and assembly of the upper cover 603 and improves the efficiency of flow tube replacement.

[0083] Optionally, the fixed cover further includes: a snap-fit ​​member 604, provided in the hollow portion 6022 of the bottom inner shell 602, the inner sidewall of the snap-fit ​​member 604 is adapted to the outer sidewall of the mounting base 40, and the snap-fit ​​member 604 is used to clamp and fix the outer sidewall of the flow tube; wherein, the edge of the second receiving groove 6031 of the upper cover 603 and the top of the snap-fit ​​member 604 form a nested limiting structure.

[0084] The inner wall of the snap-fit ​​component 604 is adapted to the outer wall of the mounting base 40, which can precisely clamp the mounting base 40 of the flow tube, fix the flow tube in the radial direction, avoid radial displacement of the flow tube, and ensure that the channels on the mounting base 40 (total pressure channel, static pressure channel 204, etc.) are precisely connected with the sensor interface.

[0085] The nested structure of the edge of the second receiving groove 6031 of the top cover 603 and the top of the snap-fit ​​604 forms a multi-dimensional limiting (upper and lower direction - top cover 603 and bottom inner shell 602; radial direction - snap-fit ​​604), which further improves the fixing reliability of the flow tube. At the same time, the nested cooperation realizes the position linkage between the top cover 603 and the snap-fit ​​604, simplifying the installation and positioning process.

[0086] Optionally, it also includes: a sealing gasket 605, disposed between the snap-fit ​​member 604 and the flow tube, for sealing the connecting pipe or quick-connect fitting between the flow tube and the pressure sensor 70 and the analyzer.

[0087] The sealing gasket 605 is located between the snap-fit ​​member 604 and the flow tube. It can fill the gap between the two to achieve a seal at the connection point, preventing fluid (such as the measured gas or liquid) from leaking from the gap, or external impurities (such as dust or moisture) from entering the channel and affecting the transmission of pressure signals. At the same time, the sealing gasket 605 can also buffer the clamping force of the snap-fit ​​member 604 on the flow tube, preventing the flow tube from being damaged due to excessive clamping, thus balancing sealing performance and structural protection.

[0088] The foregoing description and accompanying drawings fully illustrate embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included or substituted for parts and features of other embodiments. Embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims, and the foregoing embodiments should be considered exemplary and non-limiting.

Claims

1. A flow rate tube characterized by, include: The tube body is a hollow tubular structure. Along the fluid flow direction, the tube body includes an inlet section, a contraction section, a measuring section, and a diffusion section. The inner cavities of the inlet section, contraction section, measuring section, and diffusion section are connected to form the main channel for fluid flow. The measuring element is set in the measuring section of the pipe body. The measuring element has a front end face facing the inlet section and a rear end face away from the inlet section. The front end face is provided with a total pressure tapping hole, and the rear end face or the outer peripheral wall is provided with a static pressure tapping hole. The measuring element has an independent and parallel total pressure channel and a static pressure channel inside. The total pressure channel is connected to the total pressure tap and extends to the outside of the measuring element to connect to the pressure sensor. The static pressure channel is connected to the static pressure tap and extends to the outside of the measuring element to connect to the pressure sensor. The total pressure signal and static pressure signal are transmitted through the total pressure channel and the static pressure channel respectively to calculate the pressure difference or flow rate of the fluid.

2. The flow rate tube of claim 1, wherein, The contraction section is a tapered pipe section that gradually narrows from the inlet section to the measuring section along the axial direction of the pipe body; and / or, the diffusion section is a tapered pipe section that gradually widens from the measuring section away from the inlet section along the axial direction of the pipe body.

3. The flow rate tube of claim 1, wherein, The measuring element is a flat component. The flat surface of the measuring element is parallel to the fluid flow direction in the main channel, and the axis of the measuring element is perpendicular to the axis of the tube body. A gap is left between the flat surface of the measuring element and the inner wall of the measuring section to allow fluid flow.

4. The flow rate tube of claim 1, wherein, The opening direction of the total pressure tap is consistent with the fluid flow direction in the main channel, so as to form a stagnation point at the total pressure tap and collect the total fluid pressure.

5. The flow rate tube of claim 1, wherein, The side wall of the measuring section is provided with a sample collection port, which is connected to a gas analyzer through a sampling channel extending to the outside of the tube body for collecting fluid samples; and / or, The pipe wall of the measuring section is also provided with an absolute pressure acquisition hole, which is connected to a pressure sensor through a pressure channel extending to the outside of the pipe body to collect the absolute pressure of the fluid.

6. The flow rate tube of claim 1, wherein, Also includes: A grid is a mesh-like component located at the end of the inlet section of the pipe body, consisting of multiple sets of mutually perpendicular grid bars connected to form a regular grid channel.

7. The flow tube according to claim 5, characterized in that, Also includes: The mounting base is provided along the outer circumference of the measuring section of the pipe body and corresponds to the position of the measuring element; The total pressure channel, static pressure channel, sampling channel of the sample acquisition hole, and pressure channel of the absolute pressure acquisition hole of the measuring element all pass through the mounting base for connection with external pressure sensors or analyzers.

8. A digital handle characterized by Includes a handle assembly and a flow tube as described in claims 1 to 7, the flow tube being detachably connected to the handle assembly; the handle assembly includes: The handle cover encloses the receiving cavity, inside which a pressure sensor is installed; The fixed cover is connected to the handle cover and is used to detachably fix the flow tube.

9. The digital handle of claim 8, wherein, The fixed housing includes: The base is a semi-circular component located on the top of the handle cover, and has a through opening that communicates with the receiving cavity of the handle cover. The bottom inner shell is detachably connected to the base and defines a first receiving groove that is adapted to the shape of the flow tube. The bottom wall of the first receiving groove has a hollow part, which is used to avoid the mounting seat of the flow tube so that the connecting pipe or quick connector can be connected to the total pressure channel, static pressure channel, sampling channel of the sample collection hole, and pressure channel of the absolute pressure collection hole that pass through the mounting seat.

10. The digital handle of claim 9, wherein, The fixed housing also includes: The top cover engages with the base or the inner shell of the bottom, and the top cover defines a second receiving groove that is adapted to the shape of the flow tube, in order to restrict and fix the flow tube.

Images