Multi-stage adjustable throttling assembly and flow measuring device

Abstract

The utility model relates to the technical field of fluid measurement, in particular to a multi-stage adjustable throttling assembly and a flow measuring device. Comprising a measuring pipe, a piece, a rotating shaft and a rectifying piece, the surface of the measuring pipe is provided with at least two groups of high-pressure pressure taps and low-pressure pressure taps, throttling elements are rotatably arranged in the measuring pipe, the throttling amounts of the throttling elements are different, the throttling elements are arranged between the high-pressure pressure taps and the low-pressure pressure taps, and the rectifying piece is arranged between the high-pressure pressure taps and the low-pressure pressure taps. The rotating shaft is rotatably arranged in the measuring tube, the end part of the rotating shaft is connected to the throttling elements, and the rectifying part is arranged in the measuring tube and is positioned between the two groups of throttling elements. The two throttling elements with the continuous throttling ratio are arranged at intervals, the flow in a pipeline is obtained through conversion according to the differential pressure generated when fluid flows through the corresponding throttling elements, and the measuring range of a differential pressure sensor can be increased when the two throttling elements are used in cooperation with the differential pressure sensor.

Description

Technical Field

[0001] The utility model relates to the technical field of fluid measurement, in particular to a multi-stage adjustable throttling component and a flow measuring device. Background Art

[0002] The most typical flow sensors currently installed in pipes include orifice plates, standard nozzles, venturi tubes, and various velocity-averaging tubes. Orifice plates, standard nozzles, and venturi tubes create pressure differentials through the contraction of the fluid flowing through the measuring element, while velocity-averaging tubes primarily create pressure differentials through the separation of the fluid flowing through the measuring element. These pressure differentials are generally measured by differential pressure sensors or pressure sensors. However, the differential pressure or pressure sensors currently on the market have limited ranges, meaning that only pressure values ​​within their range can be accurately measured, thereby converting the accurate flow rate. In actual use, when the throttling element is determined, under the same pressure and temperature conditions, a greater flow rate results in a greater differential pressure, while a smaller flow rate results in a smaller differential pressure. The accuracy of the range is affected by the flow rate.

[0003] However, in actual industrial production and scientific research, it is often necessary to measure a relatively large flow range and accurately measure the differential pressure value when the flow is relatively small or relatively large. The previous solution is to install several differential pressure sensors with different ranges on the same throttling element, such as Figure 3 As shown, according to the range corresponding to the differential pressure, a differential pressure sensor that meets the range is determined, and the measured value is converted into flow, while the measured values ​​of other differential pressure sensors are discarded. This type of device is expensive and relatively complex. Chinese patent CN101737509 discloses an orifice plate with adjustable flow, which adjusts the flow by the mutual cooperation of a flange with a throttling hole and the orifice plate. This solution achieves flow regulation, but requires a specially processed flange. It cannot be used in situations where flanges have already been installed, and the range of use is small. For another example, Chinese patent CN203477388 also discloses an orifice plate with adjustable flow, which adjusts the flow by two rotatable identical multi-porous orifice plates that are fitted together, one of which rotates to block the area of ​​the other throttling hole. This solution achieves flow regulation, but the flow regulation range is small. For example, Chinese patents CN211574304 and CN 221957929 both use a lens aperture adjustment mechanism to adjust the effective flow area. However, such structures are relatively complex, have high processing costs, and have poor impact resistance, making them prone to getting stuck in pipelines carrying dirty media. Utility Model Content

[0004] Purpose of the utility model: to provide a multi-stage adjustable throttling component and a flow measuring device to solve the above-mentioned problems existing in the prior art.

[0005] Technical solution: A multi-stage adjustable throttling component, comprising:

[0006] The measuring tube has at least two sets of high-pressure ports and low-pressure ports on its surface;

[0007] At least two groups of throttling elements are rotatably disposed in the measuring tube; each throttling element has a different throttling amount; and the throttling element is disposed between the high-pressure port and the low-pressure port;

[0008] A rotating shaft rotatably connected to the measuring tube; an end of the rotating shaft is connected to a throttling element;

[0009] The rectifier is installed in the measuring tube and located between the two groups of throttling elements.

[0010] In a further embodiment, the high-pressure port and the low-pressure port are respectively equipped with stop valves.

[0011] In a further embodiment, the rotating shaft is connected to the output end of the execution structure, and the execution structure is used to drive the rotating shaft to rotate; the maximum rotation angle of the throttling element is 90°.

[0012] In a further embodiment, the throttling element is an orifice plate, and the orifice plate is a single-hole orifice plate.

[0013] In a further embodiment, the throttling element is a porous plate; a plurality of through holes are distributed on the surface of the porous plate; and the through holes are evenly distributed around the center of the porous plate.

[0014] In a further embodiment, the throttling element is a damping mesh structure.

[0015] In a further embodiment, a plurality of arc-shaped holes with different arc lengths are provided on the surface of the throttling element; the plurality of arc-shaped holes are distributed around the center of the throttling element, and the arc lengths thereof increase accordingly.

[0016] In a further embodiment, the plurality of groups of throttling elements have corresponding flow areas that gradually increase along the length direction of the measuring tube.

[0017] In a further embodiment, the outer edge of the throttling element is configured as a spindle structure.

[0018] A flow measurement device comprises any one of the above-mentioned multi-stage adjustable throttling components, and also comprises a differential pressure sensor, a flow computer and a temperature sensor, wherein the two acquisition ends of the differential pressure sensor are respectively connected to the high-pressure pressure port and the low-pressure pressure port; the flow computer is electrically connected to the temperature sensor of the differential pressure sensor, and the temperature sensor measures the temperature data of the high-pressure pressure port and the low-pressure pressure port respectively, and uploads the data to the flow computer.

[0019] Beneficial effects:

[0020] 1. This application sets two throttling elements at a preset interval inside the measuring tube. The differential pressure generated when the fluid flows through the throttling elements is used to convert the flow rate in the pipeline. Each throttling element has a different throttling ratio and a different flow area. By rotating the corresponding throttling element to make it work, the high and low pressure signals at both ends can be collected. When assembled with a differential pressure sensor, it can be used to measure different flow requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the multi-stage adjustable throttling component of the present application.

[0022] Figure 2 It is a schematic diagram of the flow measurement device principle of the present application.

[0023] Figure 3 This is a working diagram of the existing technical solution of this application.

[0024] Figure 4 This is another working state schematic diagram of the multi-stage adjustable throttling component of the present application.

[0025] Figure 5 It is a structural diagram of Example 2 in this application.

[0026] Figure 6 It is a structural diagram of Example 3 in this application.

[0027] Figure 7 It is a structural diagram of Example 4 in this application.

[0028] The reference numerals in the figure are: measuring tube 1, throttling element 2, rotating shaft 3, rectifier 4, stop valve 5, differential pressure sensor 6, high pressure port 7, low pressure port 8, multiple differential pressure sensors of different ranges 9, porous orifice plate 10, damping mesh structure 11, arc-shaped hole 12. DETAILED DESCRIPTION

[0029] In the following description, numerous specific details are provided to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features known in the art are not described to avoid confusion with the present invention.

[0030] Example 1

[0031] Based on the existing phenomenon mentioned in the background technology, on-site technicians often use multiple differential pressure sensors 9 with different ranges to measure flow. This application improves the traditional single throttling structure to make it have an adjustment function and apply it to the current actual flow measurement. It is combined with the differential pressure sensor 9 to achieve the characteristics of multi-range measurement. Therefore, this application proposes a multi-stage adjustable throttling component for adapting to the range requirements of the differential pressure sensor 6. Figure 1 As shown, the specific scheme includes a measuring tube 1, a throttling element 2, a rotating shaft 3, and a rectifying element 4. The surface of the measuring tube 1 is provided with multiple groups of holes according to preset requirements, which are used for high-pressure pressure ports 7, low-pressure pressure ports 8, and the mounting holes of the rotating shaft 3. The shape of the throttling element 2 is adapted to the shape of the pipe of the measuring tube 1. The throttling element 2 is fixedly connected to the rotating shaft 3. Then, by rotating the rotating shaft 3, the throttling element 2 can be rotated. Figure 1 As shown, in this embodiment, the high-pressure pressure port 7 and the low-pressure pressure port 8 are respectively arranged on both sides of the throttling element 2, and the rectifier 4 is installed between the throttling element 2 and the throttling element 2. The rectifier 4 can be a honeycomb or a combined structure such as a tube bundle.

[0032] In actual use, the throttling element 2 is rotated a maximum of 90° by rotating the rotating shaft 3, that is, from the plane of the throttling element 2 being perpendicular to the central axis of the measuring tube 1 to the plane of the throttling element 2 being parallel to the central axis of the measuring tube 1. The throttling effect of each throttling element 2 is set so that the throttling amount of the throttling element 2 gradually increases along the length of the measuring tube 1. Depending on which range is needed, the corresponding throttling element is rotated so that its plane is perpendicular to the central axis of the measuring tube 1, thus being in the throttling state. At the same time, the other throttling elements 2 are rotated so that they no longer block the airflow and are in the non-throttling state, that is, the plane of the throttling element 2 is parallel to the central axis of the measuring tube 1.

[0033] In this embodiment, the rotating shaft 3 can be manually operated, that is, a larger friction force is set between the rotating shaft 3 and the measuring tube 1, or a limiting structure is introduced to fix the rotating shaft 3 at two gears of 0° and 90°. It can also be connected to the output end of the execution structure. The execution structure is used to drive the rotating shaft 3 to rotate, and can be used for quantitative control of the cylinder assembly, motor assembly or hydraulic assembly.

[0034] In this embodiment, a plurality of throttling elements 2 are arranged along the length direction of the measuring tube 1 , and the corresponding throttling amounts thereof gradually increase.

[0035] Further, such as Figure 2 As shown, stop valves 5 are installed at the high-pressure port 7 and the low-pressure port 8 respectively. When high-pressure and low-pressure signals need to be collected, the corresponding stop valves 5 are opened.

[0036] At the same time, the outer edge of the throttling element 2 in this embodiment is streamlined toward the center, and the outer edge is configured as a spindle structure.

[0037] In this embodiment, the throttling element 2 is an orifice plate, and the orifice plate is a single-hole orifice plate. Figure 1 and Figure 4 As shown in FIG, the aperture of the orifice plate located in the direction of the airflow is smaller than the aperture of the other orifice plate.

[0038] Example 2

[0039] The throttling element 2 in this embodiment is a porous plate 10, such as Figure 5 As shown, a plurality of through holes are distributed on the surface of the porous plate 10 , and the through holes are evenly distributed in a diffuse shape around the center of the porous plate 10 . The aperture of the porous plate 10 located in the direction of the airflow is smaller than the aperture of the other porous plates 10 .

[0040] Example 3

[0041] like Figure 6 As shown, the throttling element 2 in this embodiment is a damping net structure 11, and the mesh openings in the upstream direction of the airflow are smaller than the mesh openings of the other damping nets.

[0042] Example 4

[0043] like Figure 7 As shown, a plurality of arc-shaped holes 12 with different arc lengths are provided on the surface of the throttling element 2 in this embodiment. The arc-shaped holes 12 are distributed from the center of the throttling element 2 to the surrounding areas, and the arc lengths thereof increase accordingly.

[0044] Example 5

[0045] Based on the first to fourth embodiments, this embodiment proposes a flow measurement device with an adjustable range to meet the actual measurement requirements on site. Figure 2 As shown, the system also includes a differential pressure sensor 6, a flow computer, and a temperature sensor. The two acquisition terminals of the differential pressure sensor 6 are respectively connected to the high-pressure pressure port 7 and the low-pressure pressure port 8. The flow computer is electrically connected to the temperature sensor of the differential pressure sensor 6. The temperature sensor measures the temperature data of the high-pressure pressure port 7 and the low-pressure pressure port 8, or directly measures the temperature of the airflow through a conduit, and uploads the data to the flow computer. In this embodiment, the two pressure ports of the two throttling elements 2 are connected to a single differential pressure sensor 6 via high- and low-pressure pressure pipes. The range of the differential pressure sensor 6 is adjusted by adjusting the state of the throttling element 2.

[0046] The differential pressure measurement principle formula is Q = Cd * A * √(2ΔP / ρ), where Q is the volumetric flow rate of the fluid, Cd is the fluid's outflow coefficient (obtained through calibration), A is the cross-sectional area of ​​the pipe, ΔP is the differential pressure between two points in the fluid, and ρ is the fluid's density. Because gases are significantly affected by temperature, a temperature sensor is required for compensation.

[0047] To better illustrate this embodiment, the process of this embodiment is as follows:

[0048] The first step is data acquisition: the differential pressure sensor 6 and the temperature sensor collect differential pressure and temperature data in real time, and send the data to the flow computer through a 4-20mA current signal or a digital communication protocol (such as HART, Modbus).

[0049] The second step is flow calculation: The flow computer uses a preset flow calculation formula (such as the ideal gas state equation or Bernoulli equation) to determine the instantaneous flow rate of the fluid based on the received differential pressure and temperature values.

[0050] The third step is data management: All collected data will be recorded and the current parameters can be viewed on the local display. It can also be uploaded to the SCADA system or other host computer software through the network interface for more in-depth analysis and report generation.

[0051] As described above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be interpreted as limiting the present invention itself. Various changes may be made to it in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims

1. A multi-stage adjustable throttling assembly, characterized in that: include: The measuring tube has at least two sets of high-pressure ports and low-pressure ports on its surface; At least two groups of throttling elements are rotatably disposed in the measuring tube; each throttling element has a different throttling amount; and the throttling elements are disposed between the high-pressure port and the low-pressure port of the same group; A rotating shaft rotatably connected to the measuring tube; an end of the rotating shaft is connected to a throttling element; The rectifier is installed in the measuring tube and located between the two groups of throttling elements.

2. The multi-stage adjustable throttling assembly according to claim 1, characterized in that: The high-pressure port and the low-pressure port are respectively equipped with stop valves.

3. The multi-stage adjustable throttling assembly according to claim 1, characterized in that: The rotating shaft is connected to the output end of the execution structure, and the execution structure is used to drive the rotating shaft to rotate; the maximum rotation angle of the throttling element is 90°.

4. The multi-stage adjustable throttling assembly according to claim 1, characterized in that: The throttling element is an orifice plate, and the orifice plate is a single-hole orifice plate.

5. The multi-stage adjustable throttle assembly according to claim 1, wherein: The throttling element is a porous plate; a plurality of through holes are distributed on the surface of the porous plate; and the through holes are evenly distributed around the center of the porous plate.

6. The multi-stage adjustable throttle assembly according to claim 1, wherein: The throttling element is a damping net structure.

7. The multi-stage adjustable throttle assembly according to claim 1, wherein: A plurality of arc-shaped holes with different arc lengths are provided on the surface of the throttling element; the plurality of arc-shaped holes are distributed around the center of the throttling element, and the values ​​of the arc lengths thereof increase accordingly.

8. The multi-stage adjustable throttle assembly according to claim 1, wherein: The plurality of groups of throttling elements are arranged along the length direction of the measuring tube, and the corresponding flow areas thereof gradually increase.

9. The multi-stage adjustable throttle assembly according to claim 1, wherein: The outer edge of the throttle element is configured as a spindle structure.

10. A flow measurement device, characterized in that: It includes the multi-stage adjustable throttling component according to any one of claims 1 to 9, and also includes a differential pressure sensor, a flow computer and a temperature sensor, the two acquisition ends of the differential pressure sensor are respectively connected to the high-pressure pressure port and the low-pressure pressure port; the flow computer is electrically connected to the temperature sensor of the differential pressure sensor, and the temperature sensor measures the temperature data of the high-pressure pressure port and the low-pressure pressure port respectively, and uploads them to the flow computer.

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