Flow monitoring device and dust particle counter

Abstract

The embodiment of the invention provides a flow monitoring device and a dust particle counter. The flow monitoring device comprises a monitoring body, the monitoring body is of a tubular structure so as to form a pipeline allowing to-be-detected airflow to pass through, and two through holes distributed in the axial direction are formed in the monitoring body; the first pressure leading interface and the second pressure leading interface are respectively arranged corresponding to the two through holes and are fixedly connected with the monitoring main body; wherein the monitoring main body comprises a plurality of side edges, and one side edge, opposite to the through hole, of the plurality of side edges is marked as a bottom edge. In the embodiment of the invention, the determined bottom edge is opposite to the through hole, and the bottom edge is used for fixedly installing the monitoring main body, so that the first pressure guide interface and the second pressure guide interface can be ensured to be located right above; when to-be-detected airflow with dust flows through, dust particles can be located at the lower position in the airflow under the action of gravity, the dust is not prone to entering the first pressure guiding connector and the second pressure guiding connector, and therefore the flow monitoring precision is guaranteed.

Description

Technical Field

[0001] This application relates to the fields of fluid measurement technology and optical particle counting technology, and in particular to a flow monitoring device and a dust particle counter. Background Technology

[0002] Traditional flow sensors have the problem of dust accumulation in the pressure tapping hole or measuring chamber when measuring dusty airflow, which leads to decreased measurement accuracy, zero drift, or even blockage and failure.

[0003] Current solutions largely rely on physical filtration or periodic manual cleaning, but filters need frequent replacement and may increase pressure loss, while downtime for cleaning affects continuous system operation. Although some existing technologies employ flow guiding or coating methods, it remains difficult to balance self-cleaning capability, measurement stability, and structural compactness under long-term high-dust conditions. Summary of the Invention

[0004] This application provides a flow monitoring device and a dust particle counter to solve or alleviate one or more technical problems in the prior art.

[0005] As one aspect of the embodiments of this application, this application provides a flow monitoring device, including: a monitoring body, the monitoring body having a tubular structure to form a pipeline for the airflow to be measured to pass through, the pipeline including an upstream main airflow pipeline, a throttling pipeline and a downstream main airflow pipeline in sequence along the airflow direction; the monitoring body is provided with two through holes distributed along the axial direction; The first pressure-sensing interface and the second pressure-sensing interface are respectively set with two through holes and fixedly connected to the monitoring body; the first pressure-sensing interface is connected to the inside of the upstream main airflow pipeline, and the second pressure-sensing interface is connected to the inside of the downstream main airflow pipeline. The outer wall cross-section of the monitoring body is a regular polygon with a number of sides greater than or equal to 4. The monitoring body includes multiple sides, and one of the sides opposite the through hole is marked as the bottom side.

[0006] In one embodiment, the flow monitoring device further includes a stud, which is fixed to the bottom edge; the stud is integrally formed with the monitoring body.

[0007] In one embodiment, the diameter of the through hole is smaller than the inner diameter of the throttling pipe, and is 1 / 2 to 4 / 5 of the inner diameter of the throttling pipe.

[0008] In one embodiment, a wedge-shaped flow guide is provided on the inner wall of the monitoring body opposite to the through hole. The cross-section of the wedge-shaped flow guide along the axial direction of the monitoring body is a mountain peak structure with a circular arc transition, and the cross-section of the wedge-shaped flow guide along the radial direction of the monitoring body is a circular arc structure.

[0009] In one embodiment, along the direction of airflow, the front end of the mountain structure extends below or behind the through hole, with a distance of 0-5 mm from the edge of the through hole.

[0010] In one embodiment, the top of the mountain structure located at the bottom of the arc structure is lower than the bottom of the throttling pipe.

[0011] In one embodiment, the arc of the circular structure is 5-25°.

[0012] In one implementation, the tangent angle of the mountain structure is less than 45°.

[0013] In one embodiment, the inlet channel of the first pressure interface and / or the second pressure interface is curved downward in a gooseneck shape.

[0014] As another aspect of the embodiments of this application, this application provides a dust particle counter, including: A flow monitoring device as described in any of the above embodiments; and, A fixed base is used to fix the monitoring body and ensure its installation orientation, so that the first pressure-feeding interface and the second pressure-feeding interface on the monitoring body are directly above. In this embodiment, by defining the bottom edge opposite the through hole, the bottom edge is used to fix the monitoring body, which can ensure that the first pressure-feeding interface and the second pressure-feeding interface are directly above; when the airflow to be measured, which contains dust, flows through, the dust particles will be located in the lower part of the airflow due to gravity, and the dust is less likely to enter the first pressure-feeding interface and the second pressure-feeding interface, thereby ensuring the accuracy of flow monitoring.

[0015] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of this application will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0016] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0017] Figure 1 A cross-sectional structural schematic diagram of a flow monitoring device according to an embodiment of this application is shown.

[0018] Figure 2 A schematic diagram of the structure of a monitoring subject according to an embodiment of this application is shown.

[0019] Figure 3A schematic diagram of the gas path structure of a dust particle counter according to an embodiment of this application is shown. Detailed Implementation

[0020] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this application. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0021] This application provides a flow monitoring device, such as... Figures 1 to 2 As shown, the flow monitoring device includes: a monitoring body 100, which has a tubular structure to form a pipeline for the airflow to be measured to pass through. The pipeline includes an upstream main airflow pipeline 101, a throttling pipeline 102 and a downstream main airflow pipeline 103 in sequence along the airflow direction; the monitoring body 100 is provided with two through holes 104 distributed along the axial direction.

[0022] The first pressure-applying interface 210 and the second pressure-applying interface 220 are respectively provided corresponding to the two through holes 104 and are fixedly connected to the monitoring body 100; the first pressure-applying interface 210 is connected to the interior of the upstream main airflow pipeline 101, and the second pressure-applying interface 220 is connected to the interior of the downstream main airflow pipeline 103.

[0023] The outer wall cross-section of the monitoring body 100 is a regular polygon with a number of sides greater than or equal to 4. The monitoring body 100 includes multiple sides, and one of the sides opposite to the through hole 104 is marked as the bottom side 105.

[0024] In this embodiment, the monitoring body 100 forms a complete pipeline for the airflow to be measured to pass through. Two through holes 104 are sequentially formed along the axial direction on the pipe wall of the monitoring body 100, meaning the line connecting the two through holes 104 is parallel to the axial direction of the monitoring body 100. The two through holes 104 are located in the upstream main airflow pipeline 101 region and the downstream main airflow pipeline 103 region, respectively. A first pressure tapping interface 210 and a second pressure tapping interface 220 are respectively provided corresponding to these two through holes 104 and are fixedly connected to the outer wall of the monitoring body 100, ensuring that the first pressure tapping interface 210 is connected to the interior of the upstream main airflow pipeline 101, and the second pressure tapping interface 220 is connected to the interior of the downstream main airflow pipeline 103, thereby forming a complete differential pressure measurement channel.

[0025] The outer wall cross-section of the monitoring body 100 is designed as a regular polygon with four or more sides, such as a quadrilateral, hexagon, or octagon. Among the multiple sides of the regular polygon, the side opposite to the location of the through hole 104 is marked as the bottom side 105. The marking method can be to set a mounting component, such as a stud, on the bottom side 105, or to engrave a mark.

[0026] In this embodiment, the design of the regular polygonal outer wall has the following advantages compared with the traditional circular outer wall: First, the planar side facilitates positioning and installation in narrow spaces, avoiding rolling; second, the clear bottom edge 105 mark provides a reference surface for subsequent installation and fixing, ensuring that the pressure interface always faces the predetermined upward position.

[0027] In this embodiment, when the monitoring body 100 is a regular quadrilateral, the bottom edge 105 is positioned opposite to the side edge with the through hole 104. When the monitoring body 100 is a regular pentagon, the bottom edge 105 is a planar side edge, and the through hole 104 is located on the edge line opposite to the bottom edge 105, with the edge line coinciding with one diameter of the through hole 104.

[0028] In this embodiment, the bottom edge 105 is positioned opposite the through hole 104, and the bottom edge 105 is used to fix the monitoring body 100, ensuring that the first pressure interface 210 and the second pressure interface 220 are located directly above. When the airflow to be measured, containing dust, flows through, the dust particles will be positioned at a lower position in the airflow due to gravity, making it less likely for dust to enter the first pressure interface 210 and the second pressure interface 220, thereby ensuring the accuracy of flow monitoring. In one embodiment, the flow monitoring device also includes a stud (not shown in the figure), which is fixed to the bottom edge 105; the stud is integrally formed with the monitoring body 100.

[0029] In this embodiment, a stud is fixedly installed at the bottom edge 105 of the monitoring body 100, and the stud and the monitoring body 100 are manufactured using an integral molding process. Specifically, the stud can be directly cast or machined at the geometric center of the bottom edge 105, or a double stud structure can be symmetrically arranged on both sides of the bottom edge 105. The axis of the stud is perpendicular to the plane of the bottom edge 105, which facilitates threaded connection with the external mounting base 510.

[0030] The integrated design of the stud and the monitoring body 100 eliminates the assembly gaps and loosening risks that may exist in the separate connection, ensuring that the monitoring body 100 maintains a stable installation posture during long-term use.

[0031] The stud is located on the bottom edge 105 opposite to the through hole 104 (i.e., the pressure-applying interface). When the monitoring body 100 is fixed to the mounting base 510 by the stud, the pressure-applying interface naturally faces directly upward, forming a stable layout of "bottom edge 105 fixed, top edge pressure-applying". This layout keeps the pressure-applying interface away from the bottom deposition area of ​​the airflow pipe. Dust particles in the airflow to be measured are mostly deposited at the bottom of the pipe due to gravity, while the pressure-applying interface inlet position directly above effectively avoids the high-concentration dust area, significantly reducing the probability of dust entering the pressure-applying channel and fundamentally avoiding the problem of decreased measurement accuracy caused by dust blockage.

[0032] In one embodiment, the diameter of the through hole 104 is smaller than the inner diameter of the throttling pipe, and is 1 / 2 to 4 / 5 of the inner diameter of the throttling pipe.

[0033] This application embodiment optimizes the design of the orifice diameter of the through hole 104. The orifice diameter of the through hole 104 is set to be smaller than the inner diameter of the throttling pipe, specifically in the range of 1 / 2 to 4 / 5 of the inner diameter of the throttling pipe. For example, when the inner diameter of the throttling pipe is 10mm, the orifice diameter of the through hole 104 can be selected as a value between 5mm and 8mm.

[0034] This aperture ratio setting is based on both fluid dynamics principles and dust prevention considerations: on the one hand, the aperture of the through-hole 104 being smaller than the inner diameter of the throttling tube ensures that the pressure signal collected at the pressure tapping interface mainly reflects the pressure state of the main airflow, rather than the severe turbulence in the local area of ​​the throttling orifice, thus improving the stability and representativeness of the differential pressure signal; on the other hand, limiting the aperture of the through-hole 104 to more than 1 / 2 of the inner diameter of the throttling tube (i.e., not less than 1 / 2) avoids the pressure tapping delay and blockage risk caused by an excessively small aperture, while the upper limit constraint of 4 / 5 ensures that the through-hole 104 will not be too large and introduce too much boundary layer interference.

[0035] This application embodiment, through the design of the aperture of the through hole 104, can form an appropriate airflow barrier at the inlet of the pressure interface, preventing large dust particles from rushing into the pressure channel with the airflow, thereby achieving effective dust filtration while ensuring response speed and maintaining long-term measurement accuracy.

[0036] In one embodiment, a wedge-shaped guide platform 110 is provided on the inner wall of the monitoring body 100 opposite to the through hole 104. The cross section of the wedge-shaped guide platform 110 along the axial direction of the monitoring body 100 is a mountain peak structure with a circular arc transition, and the cross section of the wedge-shaped guide platform 110 along the radial direction of the monitoring body 100 is a circular arc structure.

[0037] In this embodiment, a wedge-shaped flow guide 110 is provided on the inner wall of the monitoring body 100, opposite to the through hole 104. The cross-section of the wedge-shaped flow guide 110 along the axial direction of the monitoring body 100 has a mountain-like structure with a smooth arc transition, that is, a smooth arc rise from the front end to the top and a smooth arc descent from the top to the rear end; at the same time, the cross-section along the radial direction of the monitoring body 100 also has an arc structure, forming a transverse arc-shaped curved surface.

[0038] The wedge-shaped flow guide 110 is positioned opposite the through-hole 104. The peak structure along the axial direction of the monitoring body 100 guides the main airflow smoothly upwards, over the ridge to the bottom of the pipe. The peak structure first lifts the airflow, causing dust particles in the measured airflow to move forward along the surface of the flow guide 110, while clean gas flows upwards more easily. Furthermore, dust particles move with the airflow from the top. Since the dust particles themselves are less massive than those in the clean gas, they are less likely to be lifted further during airflow, thus reducing their chance of entering the pressure-sensing interface. This inertial separation effect reduces the amount of dust entering the pressure-sensing interface, effectively protecting the measurement accuracy of the flow monitoring device.

[0039] In this embodiment, the rounded peak structure and the radial rounded structure create a smooth transition between the guide platform 110 and the inner wall of the monitoring body 100, avoiding flow dead zones and particle deposition caused by sharp angles. In one embodiment, along the flow direction of the airflow, the front end of the peak structure extends below or behind the through hole 104, with a distance of 0-5 mm from the edge of the through hole 104.

[0040] This application embodiment precisely defines the front end position of the mountain peak structure. Along the airflow direction, the front end of the mountain peak structure extends below or behind the through hole 104, and the axial distance between the front end edge and the edge of the through hole 104 is controlled within the range of 0 to 5 mm.

[0041] In the embodiments of this application, the front end and the rear end refer to the front and rear directions of the airflow direction.

[0042] In this embodiment, by limiting the axial distance between the front edge of the mountain-shaped structure and the edge of the through-hole 104 to within the range of 0 to 5 mm, it is ensured that the guiding effect of the flow guide 110 on the airflow can effectively block dust particles coming from upstream with the airflow from directly entering the through-hole 104 before the airflow flows through the pressure-sensing interface. Due to their large mass, the dust particles tend to maintain a straight-line motion or flow along the pipe wall due to inertia, and are difficult to make a sharp upward turn with the airflow to enter the pressure-sensing interface, thereby achieving "self-cleaning" protection for the pressure-sensing channel and maintaining the accuracy and stability of the measurement over a long period of time.

[0043] In one embodiment, the top of the mountain structure located at the bottom of the arc structure is lower than the bottom of the throttling pipe.

[0044] In this embodiment, the top of the peak structure at the bottom of the arc-shaped structure is lower than the bottom of the throttling pipe. That is, the highest point of the wedge-shaped guide platform 110 is still below the centerline of the throttling pipe and does not encroach on the effective flow section of the throttling pipe.

[0045] The height limitation of the guide platform 110 in this embodiment ensures that the flow area of ​​the throttling pipe, a key component for flow measurement, is not encroached upon, maintaining the standard calculation relationship between differential pressure and flow rate and guaranteeing measurement accuracy. Furthermore, by restricting the top of the guide platform 110 below the bottom of the throttling pipe, the guide platform 110 primarily acts on the main airflow pipeline area, without interfering with the critical flow state at the throttling orifice. From a dust prevention perspective, this low-positioning makes the lifting effect of the guide platform 110 on the airflow more gentle, avoiding strong turbulent disturbances near the throttling orifice, thereby reducing dust uplift caused by turbulent entrainment. In one embodiment, the arc of the circular structure is 5-25°.

[0046] In this embodiment, the arc of the radial cross-section circular arc structure is controlled within the range of 5° to 25°. The arc refers to the size of the central angle subtended by the arc. The circular arc structure is set against the inner wall of the main airflow duct, and its radius is fixed. The smaller the arc, the shorter the length of the circular arc structure in the radial direction of the monitoring body 100; conversely, the larger the arc, the longer the length of the circular arc structure in the radial direction of the monitoring body 100. A larger arc results in a higher height for the peak structure set on the inner wall, and dust flowing towards the peak structure may approach the height of the through-hole 104, affecting the dustproof effect.

[0047] When the arc is less than 5°, the guiding effect of the guide platform 110 is too weak to form an effective airflow lifting and dust separation effect. In one embodiment, the tangent angle of the mountain structure is less than 45°.

[0048] The embodiments of this application limit the tangent angle of the mountain structure to less than 45°. The tangent angle refers to the angle between the tangent at any point on the surface of the mountain and the horizontal direction (or the direction of the pipe wall), and the maximum angle occurs on the steep side of the mountain.

[0049] Limiting the tangent angle to within 45° ensures the overall gentleness of the mountain structure. From a fluid dynamics perspective, a slope of less than 45° is considered a gentle slope, and boundary layer separation is less likely to occur when airflow flows on such surfaces, maintaining a stable laminar or weakly turbulent state. This stable flow state effectively prevents dust from reaching the pressure inlet and avoids the generation of strong local eddies. The lift angle of less than 45° makes the airflow turn more gently, enhancing the inertial difference between gas and dust particles—the gas can smoothly follow the curved surface, while dust particles, due to inertia, cannot keep up with this turn and thus flow along the surface of the mountain structure, away from the pressure inlet area. In one embodiment, two quick-connect interfaces 300 are also included, respectively fixed to both ends of the monitoring body 100 along the axial direction, for quick connection with external air pipes; the quick-connect interfaces 300 are provided with L-shaped keyway structures 310 for quick snap-fit ​​with external air pipes, and the monitoring body 100 does not need to be rotated during the connection process.

[0050] In this embodiment, quick-connect interfaces 300 are fixedly provided at both ends of the monitoring body 100 along the axial direction. These interfaces are used for quick connection with external air pipes and are provided with L-shaped keyway structures 310. The L-shaped keyway structures 310 achieve directional snap-fit ​​through specific key positions, and the connection can be achieved without rotating the monitoring body 100. This means that the orientation of the monitoring body 100 (especially the orientation of the pressure inlet) remains fixed during installation, and internal dust accumulation or sealing surface wear will not be caused by rotation.

[0051] When connecting an external air tube, simply align the mating structure of the L-shaped keyway structure 310 on the air tube connector and push it in. The L-shaped keyway structure 310 is located above the monitoring body 100 and is quickly locked in place using the quick-release mechanism. The air tube orientation can be adjusted first to ensure the mating structure on the air tube connector is facing upwards, thus eliminating the need for repeated rotation and adjustment of the air tube, allowing for easy installation and fixation to the monitoring body 100.

[0052] In one embodiment, the inlet channels of the first pressure port 210 and / or the second pressure port 220 are curved downward in a gooseneck shape.

[0053] In this embodiment, the inlet channels of the first pressure-feeding interface 210 and / or the second pressure-feeding interface 220 are designed as a gooseneck-shaped downward-curving structure. A gooseneck shape refers to a channel that first extends upwards to a certain height and then curves downwards to form an arc resembling a goose's neck. The downward curve at the end causes the actual inlet of the pressure-feeding interface to face downwards or diagonally downwards, creating a directional "misalignment" with the upward airflow inside the monitoring body 100. This misalignment forms a physical barrier, making it difficult for large dust particles to undergo such a drastic change in direction, even if they move with the airflow. Furthermore, the downward-curving gooseneck design ensures that even if a small amount of dust enters the pressure-feeding channel, it will be deposited at the bottom bend of the gooseneck under gravity, minimizing its impact on measurement accuracy.

[0054] In one embodiment, the portion constituting the throttling pipe 102 is a retractable structure, having a contracted state and an extended state; in the contracted state, a portion of the inner diameter is reduced to form the throttling pipe 102; in the extended state, a portion of the inner diameter is increased to be substantially consistent with the inner diameter of the main airflow pipe.

[0055] In this embodiment, the portion constituting the throttling conduit 102 is designed as a telescopic structure. This structure has two states: a contracted state and an extended state. In the contracted state, the inner diameter of this portion decreases, forming an effective throttling conduit 102 and generating differential pressure. In the extended state, the inner diameter of this portion increases to be substantially the same as the inner diameters of the upstream main airflow conduit 101 and the downstream main airflow conduit 103. At this time, the entire conduit is approximately a straight pipe of equal diameter, the throttling effect disappears, and the introduction of clean airflow can blow away dust located on the inner wall of the monitoring body 100, ensuring the long-term reliability of the flow monitoring device. In one embodiment, the telescopic structure is a corrugated pipe or a pipe section made of shape memory alloy.

[0056] Corrugated pipes achieve radial expansion (stretched state) through axial compression and radial contraction (tightened state) through axial stretching; shape memory alloy pipe sections utilize temperature or stress-induced phase transformation to achieve shape memory effect, restoring a preset tightened or stretched shape under specific conditions.

[0057] Both of the above implementation methods offer excellent sealing and structural integrity. The throttling sections formed in the compressed state have smooth inner surfaces (the inner corrugations of the bellows tend to flatten under compression), reducing flow dead zones and lowering the risk of dust accumulation. This structural design, combining functionality and dustproof properties, ensures that the flow monitoring device maintains high-precision measurement performance under various operating conditions.

[0058] Other components of the flow monitoring device in the above embodiments can be derived from various technical solutions that are now and will be known to those skilled in the art, and will not be described in detail here.

[0059] This application also provides a dust particle counter, such as Figure 3 As shown, the dust particle counter includes a laser sensing cavity 500 and multiple pipelines. Further, the dust particle counter also includes a flow monitoring device as described in any of the above embodiments, and a mounting base 510. The flow monitoring device is used to monitor the gas flow rate in the pipelines, and the mounting base 510 is used to fix the monitoring body 100 and ensure its installation orientation, such that the first pressure-feeding port 210 and the second pressure-feeding port 220 are directly above it.

[0060] In the dust particle counter of this application embodiment, the airflow to be measured often contains a high concentration of dust particles, which places extremely high demands on dust protection for flow measurement. The matching design of the fixed base 510 and the polygonal outer wall of the monitoring body 100 (the pressure plate can be provided with a groove or plane matching the polygon) ensures that the monitoring body 100 has a definite orientation during installation—the bottom edge 105 faces downward and fits against the mounting base 510, and the pressure inlet faces upward. This forced orientation fixation allows dust particles to naturally settle at the bottom of the pipeline under gravity, away from the pressure inlet at the top; secondly, the fixed installation orientation ensures that the dust-proof structures such as the wedge-shaped guide platform 110 and the gooseneck-shaped pressure channel in the aforementioned embodiment are always in the optimal working position, giving full play to their designed inertial separation and physical barrier functions; finally, during the periodic calibration or maintenance of the dust particle counter, the fixed orientation facilitates quick restoration of the installation state, avoiding the trouble of recalibration caused by the displacement of the pressure inlet orientation due to changes in the installation posture. Thus, the accuracy of flow monitoring and the reliability of particle counting are ensured.

[0061] Other configurations of the dust particle counter in the above embodiments can be adopted from various technical solutions now and in the future known to those skilled in the art, and will not be described in detail here.

[0062] In the description of this specification, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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.

[0063] Furthermore, 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0064] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0065] In this application, unless otherwise expressly 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 being 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 being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0066] The foregoing disclosure provides many different implementations or examples for carrying out different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described above. Of course, these are merely examples and are not intended to limit the scope of this application. 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 implementations and / or arrangements discussed.

[0067] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this application, and these should all be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A flow monitoring device, characterized in that, include: The monitoring body has a tubular structure to form a pipeline through which the airflow to be measured passes. The pipeline includes, in sequence along the airflow direction, an upstream main airflow pipeline, a throttling pipeline, and a downstream main airflow pipeline. The monitoring body is provided with two through holes distributed along the axial direction. The first pressure-applying interface and the second pressure-applying interface are respectively provided corresponding to the two through holes and are fixedly connected to the monitoring body; the first pressure-applying interface is connected to the interior of the upstream main airflow pipeline, and the second pressure-applying interface is connected to the interior of the downstream main airflow pipeline. The outer wall of the monitoring body has a regular polygonal cross-section, and the number of sides of the regular polygon is greater than or equal to 4; the monitoring body includes multiple sides, and one of the multiple sides opposite to the through hole is marked as the bottom side.

2. The flow monitoring device according to claim 1, characterized in that, The flow monitoring device also includes a stud, which is fixed to the bottom edge; the stud is integrally formed with the monitoring body.

3. The flow monitoring device according to claim 1, characterized in that, The diameter of the through hole is smaller than the inner diameter of the throttling pipe, and is 1 / 2 to 4 / 5 of the inner diameter of the throttling pipe.

4. The flow monitoring device according to any one of claims 1 to 3, characterized in that, A wedge-shaped flow guide is provided on the inner wall of the monitoring body opposite to the through hole. The cross-section of the wedge-shaped flow guide along the axial direction of the monitoring body is a mountain peak structure with a circular arc transition, and the cross-section of the wedge-shaped flow guide along the radial direction of the monitoring body is a circular arc structure.

5. The flow monitoring device according to claim 4, characterized in that, Along the direction of airflow, the front end of the mountain structure extends below or behind the through hole, with a distance of 0-5mm from the edge of the through hole.

6. The flow monitoring device according to claim 4, characterized in that, The top of the mountain structure, located at the bottom of the arc structure, is lower than the bottom of the throttling pipe.

7. The flow monitoring device according to claim 4, characterized in that, The arc of the circular structure is 5-25°.

8. The flow monitoring device according to claim 4, characterized in that, The tangent angle of the mountain peak structure is less than 45°.

9. The flow monitoring device according to claim 1, characterized in that, The inlet channel of the first pressure-feeding interface and / or the second pressure-feeding interface is curved downward in a gooseneck shape.

10. A dust particle counter, characterized in that, include: The flow monitoring device as described in any one of claims 1-9; as well as, A fixed base is used to fix the monitoring body and ensure its installation orientation, such that the first pressure interface and the second pressure interface on the monitoring body are directly above.

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