A multi-range flow measuring device

Abstract

The present application relates to the field of measuring machinery, and provides a multi-range flow measuring device, comprising: an orifice plate and a differential pressure transmitter, the differential pressure transmitter being used for detecting the pressure difference before and after the fluid flows through the orifice plate; the orifice plate comprises a first orifice plate and a second orifice plate, the first orifice plate being used for being fixed on the inner wall of a pipeline, the second orifice plate being rotatably arranged in the pipeline through an adjusting assembly, and the first orifice plate and the second orifice plate being sequentially and spacedly arranged along the flow direction of the fluid; the first orifice plate is provided with a first through-flow hole, and the second orifice plate is provided with a second through-flow hole, and the relative positions of the first through-flow hole and the second through-flow hole change with the rotation of the second orifice plate; the present application can change the resistance coefficient of the orifice plate, not only expands the measuring range, has good versatility, but also has low cost and simple structure.

Description

Technical Field

[0001] This invention relates to the field of measuring machinery technology, and in particular to a multi-range flow measurement device. Background Technology

[0002] Flow meters are used to measure the flow rate of gas or liquid in pipelines and are widely used in petrochemical and other fields. There are many types of flow meters, and orifice plate flow meters are one of them. Orifice plate flow meters, also known as differential pressure flow meters, are high-range differential pressure flow devices composed of a throttling element and a differential pressure transmitter, capable of measuring the flow rate of gas, steam, liquid, and natural gas. The throttling element is generally an orifice plate. The orifice plate is installed in the pipeline; when fluid flows through it, the fluid locally contracts, the flow stream concentrates, and the flow velocity increases, thus generating a static pressure difference across the orifice plate. Based on the principle of flow continuity, Bernoulli's equation, and the resistance coefficient of the orifice plate, the differential pressure transmitter can derive the relationship between the pressure difference and the flow rate, and thus calculate the flow rate.

[0003] Orifice plate flow meters are characterized by their simple structure, low cost, convenient maintenance, stable performance, and reliable operation. In existing orifice plate flow meters, the orifice plate is generally a standard orifice plate with a fixed resistance coefficient. In differential pressure transmitters, the conversion relationship between the resistance coefficient and the flow rate obtained from the pressure difference depends primarily on the actual pressure difference of the fluid because the resistance coefficient remains constant. Therefore, the measurement range and accuracy of the orifice plate flow meter are directly limited by the measurable range of the differential pressure transmitter.

[0004] To extend the measurement range of orifice plate flowmeters, the main methods currently used are to configure multiple differential pressure transmitters or variable-range differential pressure transmitters within the same orifice plate flowmeter, thereby improving the measurement range and accuracy. However, variable-range differential pressure transmitters are expensive to produce. Adding multiple differential pressure transmitters with fixed ranges to an orifice plate flowmeter not only increases production costs but also results in a complex and cumbersome structure, lacking convenience. Summary of the Invention

[0005] This invention provides a multi-range flow measurement device, which at least solves the problems of current orifice plate flow meters being complex and cumbersome in structure, inconvenient to use, and expensive.

[0006] The present invention provides a multi-range flow measurement device, comprising: an orifice plate and a differential pressure transmitter, wherein the differential pressure transmitter is used to detect the pressure difference between the fluid before and after flowing through the orifice plate; The orifice plate includes a first orifice plate and a second orifice plate. The first orifice plate is fixed to the inner wall of the pipe, and the second orifice plate is rotatably disposed in the pipe. The first orifice plate and the second orifice plate are arranged alternately along the flow direction of the fluid. The first orifice plate is provided with a first flow hole, and the second orifice plate is provided with a second flow hole. As the second orifice plate rotates, the relative positions of the first flow hole and the second flow hole change. The center point of the second flow hole does not coincide with the center point of the second orifice plate.

[0007] According to the present invention, a multi-range flow measurement device further includes an adjustment component, the adjustment component including an adjustment handle and a first gear, the first gear being sleeved on the adjustment handle, and the adjustment handle being used to drive the first gear to rotate. The second perforated plate is fitted with a second gear, which meshes with the first gear to drive the second perforated plate to rotate around the central axis of the second perforated plate.

[0008] According to the present invention, a multi-range flow measurement device further includes a first sealing ring and a second sealing ring, wherein the first sealing ring and the second sealing ring are located on opposite sides of the second orifice plate and are used to seal the connection gap between the second orifice plate and the pipe.

[0009] According to a multi-range flow measurement device provided by the present invention, the first orifice plate is provided with a fixing ring, the outer peripheral wall of the fixing ring is used to fix it to the inner wall of the pipe, and the fixing ring is sleeved on the first orifice plate.

[0010] According to a multi-range flow measurement device provided by the present invention, the diameter of the second flow passage is larger than the diameter of the first flow passage.

[0011] According to a multi-range flow measurement device provided by the present invention, a plurality of first flow passages are provided, and the plurality of first flow passages are arranged at intervals along the circumference of the first orifice plate; the diameter of each first flow passage is different. As the second orifice plate rotates, the second flow orifice corresponds to the first flow orifice with a different diameter.

[0012] According to the present invention, a multi-range flow measurement device is provided, wherein the first flow passage and the second flow passage are circular or fan-shaped.

[0013] According to a multi-range flow measurement device provided by the present invention, a plurality of second orifice plates are provided, each of which is rotatably disposed in the pipe, and the plurality of second orifice plates are arranged sequentially at intervals along the flow direction of the fluid and are all perpendicular to the inner wall of the pipe.

[0014] According to the present invention, a multi-range flow measurement device is provided, wherein the distance between the first orifice plate and the second orifice plate is 30cm to 50cm.

[0015] According to a multi-range flow measurement device provided by the present invention, the differential pressure transmitter includes a pressure transmitter, a first pressure measuring tube and a second pressure measuring tube, the pressure transmitter is disposed outside the pipeline, and the first pressure measuring tube and the second pressure measuring tube are respectively electrically connected to the pressure transmitter. The first pressure measuring tube passes through the wall of the pipe and is located on the side of the first orifice plate away from the second orifice plate, so as to collect the pressure of the fluid before it flows through the first orifice plate; The second pressure measuring tube is inserted through the wall of the pipe and located on the side of the second orifice plate away from the first orifice plate, so as to collect the pressure of the fluid after flowing through the first orifice plate and the second orifice plate.

[0016] This invention provides a multi-range flow measurement device. A differential pressure transmitter is used to detect the pressure difference of fluid before and after flowing through an orifice plate. A first orifice plate and a second orifice plate are arranged alternately along the flow direction of the fluid so that the fluid flows through the first orifice plate and the second orifice plate in sequence. The first orifice plate is fixed to the inner wall of the pipe and has a first flow passage. The second orifice plate has a second flow passage. As the second orifice plate rotates, the relative positions of the first and second flow passages change, which can change the resistance coefficient of the orifice plate, thereby changing the pressure difference measured in the differential pressure transmitter. This, in turn, changes the measurement range of the orifice plate flowmeter. Users can adaptively select the measurement range of the orifice plate flowmeter that matches the characteristics of the fluid to be measured and the estimated flow rate. This invention not only broadens the measurement range of the orifice plate flowmeter and has good versatility, but also has low cost and a simple structure. Attached Figure Description

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

[0018] Figure 1 This is one of the structural schematic diagrams of the multi-range flow measurement device provided by the present invention; Figure 2 This is the second schematic diagram of the structure of the multi-range flow measurement device provided by the present invention; Figure 3 This is a front view of the multi-range flow measurement device provided by the present invention; Figure 4 This is a schematic diagram showing the connection between the adjustment component and the second orifice plate provided by the present invention.

[0019] Figure label: 1. Orifice plate; 11. First orifice plate; 12. Second orifice plate; 111. First flow hole; 112. Retaining ring; 121. Second flow hole; 123. Second gear; 124. First sealing ring; 125. Second sealing ring; 2. Differential pressure transmitter; 21. Pressure transmitter; 22. First pressure measuring tube; 23. Second pressure measuring tube; 3. Adjustment assembly; 31. Adjustment handle; 32. First gear; 100. Pipeline. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0021] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] The following is combined with Figures 1-4 The present invention provides a detailed description of a multi-range flow measurement device through specific embodiments and application scenarios.

[0023] like Figure 1 , Figure 2 and Figure 3 As shown, the present invention provides a multi-range flow measurement device, including: an orifice plate 1 and a differential pressure transmitter 2, wherein the differential pressure transmitter 2 is used to detect the pressure difference between the fluid before and after flowing through the orifice plate 1.

[0024] The orifice plate 1 includes a first orifice plate 11 and a second orifice plate 12. The first orifice plate 11 is fixed to the inner wall of the pipe 100, and the second orifice plate 12 is rotatably disposed inside the pipe 100. The first orifice plate 11 and the second orifice plate 12 are arranged alternately along the flow direction of the fluid.

[0025] The first orifice plate 11 is provided with a first flow passage 111, and the second orifice plate 12 is provided with a second flow passage 121. As the second orifice plate 12 rotates, the relative positions of the first flow passage 111 and the second flow passage 121 change.

[0026] The center point of the second flow hole 121 does not coincide with the center point of the second orifice plate 12.

[0027] Understandably, the multi-range flow measurement device utilizes an orifice plate 1 to generate a pressure difference in the pipeline 100, and then uses a differential pressure transmitter 2 to collect the pressure difference and convert it into parameters such as flow rate and velocity, thereby enabling the multi-range flow measurement device to monitor the fluid. Among these, selecting a suitable orifice plate type and installation location plays a crucial role in ensuring the accuracy of the multi-range flow measurement device.

[0028] The resistance coefficient of orifice plate 1 refers to the ratio of the resistance generated by orifice plate 1 when fluid passes through it to the resistance under ideal conditions. The resistance coefficient is a dimensionless parameter that reflects the degree to which orifice plate 1 impedes fluid flow. In practical applications, a suitable resistance coefficient needs to be selected based on factors such as specific fluid properties, flow range, and accuracy requirements. A correct resistance coefficient can improve the measurement accuracy of the orifice plate flowmeter, ensuring the accuracy and reliability of the flow measurement results.

[0029] Existing single-orifice plate flowmeters can have their resistance coefficients calculated using empirical formulas. However, in complex cases, such as the multi-orifice plate structure proposed in this invention, the resistance coefficient needs to be determined experimentally or through high-precision simulation calculations. In existing technologies, the resistance coefficient of the orifice plate is fixed. With a constant resistance coefficient, the measurement range of the orifice plate flowmeter is determined solely by the range of the differential pressure transmitter 2. The range of a single differential pressure transmitter 2 is relatively limited, thus affecting the overall measurement range and versatility of the orifice plate flowmeter.

[0030] The multi-range flow measurement device provided by this invention adjusts the measurement range of the entire multi-range flow measurement device by changing the resistance coefficient of the orifice plate 1. This not only expands the measurement range of the multi-range flow measurement device, but also offers low cost and good versatility. Specifically, as shown... Figure 1 and Figure 2 As shown, the arrows indicate the direction of fluid flow. Fluid flows in from the first orifice plate 11 and then flows out from the second orifice plate 12. Both the first orifice plate 11 and the second orifice plate 12 are perpendicular to the inner wall of the pipe 100. The first orifice plate 11 is located upstream, and the second orifice plate 12 is located downstream.

[0031] like Figure 1 As shown, the first orifice plate 11 can be fixed to the inner wall of the pipe 100 by fasteners. The first flow hole 111 is located on the first orifice plate 11. Since the first orifice plate 11 is fixed, the position of the first flow hole 111 will not change.

[0032] like Figure 1 and Figure 2As shown, both the first orifice plate 11 and the second orifice plate 12 are circular to accommodate the shape of the pipe 100. The second orifice plate 12 is arranged parallel to the first orifice plate 11. The second flow hole 121 is located on the second orifice plate 12.

[0033] It should be noted that the center of the second flow hole 121 does not coincide with the center of the second orifice plate 12, so as to ensure that the distance between the second flow hole 121 and the first flow hole 111 changes during the rotation of the second orifice plate 12.

[0034] Optional, such as Figure 1 As shown, both the first flow orifice 111 and the second flow orifice 121 are circular in shape. Of course, the first flow orifice 111 and the second flow orifice 121 can also be other shapes such as fan-shaped or elliptical, and the present invention does not specifically limit them.

[0035] In some embodiments, the diameter of the second flow orifice 121 is slightly larger than that of the first flow orifice 111 or the same as that of the first flow orifice 111.

[0036] It should be noted that the second orifice plate 12 does not rotate during the measurement process of the multi-range flow measurement device. The user can adaptively adjust the position of the second flow orifice 121 relative to the first flow orifice 111 according to the characteristics of the fluid and the flow rate.

[0037] The conversion formulas between the drag coefficient, pressure difference, and flow rate are as follows: Where Q is the fluid flow rate; denoted as the resistance coefficient of the orifice plate; A is the cross-sectional area of ​​pipe 100. ρ is the differential pressure value of the fluid measured by differential pressure transmitter 2; ρ is the density of the fluid.

[0038] The following is based on Figure 1 and Figure 2 Taking the two relative positional relationships shown as examples, and combining them with the above formulas, we can illustrate the relationship between the resistance coefficient of orifice plate 1 and the pressure difference and flow rate.

[0039] like Figure 1 As shown, the centerlines of the first flow orifice 111 and the second flow orifice 121 are coaxial. In this case, the resistance coefficient of the orifice plate 1 is the first resistance coefficient. The distance between the first flow orifice 111 and the second flow orifice 121 is the shortest. At this time, the resistance experienced by the fluid is minimal, that is, the first resistance coefficient is minimal. The differential pressure transmitter 2 detects the minimum pressure difference across the pipe 100. The differential pressure transmitter 2 calculates the fluid flow rate based on the first resistance coefficient and the pre-set conversion formula between pressure difference and flow rate.

[0040] like Figure 2As shown, next, the rotation angle of the second orifice plate 12 is changed, so that the distance between the second flow orifice 121 and the first flow orifice 111 changes. In this case, the drag coefficient of the orifice plate 1 is the second drag coefficient. At this time, compared to Figure 1 In this case, the distance between the first flow orifice 111 and the second flow orifice 121 is larger, meaning the fluid flow path is longer, resulting in a greater second resistance coefficient than the first resistance coefficient. The differential pressure transmitter 2 also detects a larger pressure difference across the pipe 100. Because the resistance coefficient of the orifice plate 1 changes, the pressure difference measured by the differential pressure transmitter 2 also changes, meaning the range of the differential pressure transmitter 2 changes, thereby changing the measurement range of the entire multi-range flow measurement device.

[0041] In other words, the resistance coefficient of the orifice plate 1 changes depending on the position of the second flow orifice 121, which in turn changes the measurement range of the multi-range flow measurement device. Users can adjust the relative position of the second flow orifice 121 with respect to the first flow orifice 111 according to actual conditions to obtain the required range of the multi-range flow measurement device.

[0042] This invention provides a multi-range flow measurement device. A differential pressure transmitter 2 is used to detect the pressure difference of fluid before and after flowing through an orifice plate 1. A first orifice plate 11 and a second orifice plate 12 are arranged sequentially and alternately along the flow direction of the fluid, so that the fluid flows through the first orifice plate 11 and the second orifice plate 12 in sequence. The first orifice plate 11 is fixed to the inner wall of the pipe 100 and has a first flow passage 111. The second orifice plate 12 has a second flow passage 121. As the second orifice plate 12 rotates, the relative positions of the first flow passage 111 and the second flow passage 121 change, which can change the resistance coefficient of the orifice plate 1, thereby changing the pressure difference measured in the differential pressure transmitter 2, and thus changing the measurement range of the multi-range flow measurement device. Users can adaptively select the measurement range of the multi-range flow measurement device that matches the characteristics of the fluid to be measured and the estimated flow rate. This invention not only broadens the measurement range of the orifice plate flow meter and has good versatility, but also has low cost and a simple structure.

[0043] In some embodiments, such as Figure 4 As shown, the multi-range flow measurement device also includes an adjustment component 3. The adjustment component 3 includes an adjustment handle 31 and a first gear 32. The first gear 32 is sleeved on the adjustment handle 31, and the adjustment handle 31 is used to drive the first gear 32 to rotate.

[0044] The second gear 123 is sleeved on the second perforated plate 12. The second gear 123 meshes with the first gear 32 to drive the second perforated plate 12 to rotate around the central axis of the second perforated plate 12.

[0045] Understandably, the adjusting component 3 is located in the pipe 100. One side of the adjusting component 3 is connected to the second orifice plate 12; the other side is exposed outside the pipe 100, facilitating user operation of the adjusting component 3. The adjusting component 3 is used to drive the second orifice plate 12 to rotate around its central axis, thereby changing the relative position of the first flow orifice 111 and the second flow orifice 121, thus altering the resistance coefficient of the orifice plate 1.

[0046] It should be noted that during the design and development phase, the correlation between the phase of the adjustment component 3 and the range of the multi-range flow measurement device can be obtained, so that the measurement range of the multi-range flow measurement device can be switched by controlling the phase of the adjustment component 3 during use.

[0047] In this invention, the phase change of the adjusting component 3 can be a discrete value. By setting a limiting structure on the side of the adjusting component 3, the rotation angle of the adjusting component 3 is kept constant at 10°, 15° or 30° each time, thereby quantitatively adjusting the relative position of the second flow orifice 121 and the first flow orifice 111, thereby realizing accurate switching of the measurement range of the multi-range flow measurement device.

[0048] Specifically, such as Figure 4 As shown, a portion of the first gear 32 is disposed within the pipe 100 and connected to the second orifice plate 12. The other portion of the first gear 32 protrudes from the pipe 100. An adjusting handle 31 is disposed outside the pipe 100 and extends in a direction parallel to the central axis of the second orifice plate 12. The first gear 32 is fitted onto the adjusting handle 31. In use, the adjusting handle 31 is manually turned to cause it to rotate the first gear 32. The first gear 32 connects to the second orifice plate 12, thereby causing the second orifice plate 12 to rotate relative to the inner wall of the pipe 100.

[0049] Furthermore, such as Figure 4 As shown, a second gear 123 is sleeved on the second orifice plate 12. The first gear 32 meshes with the second gear 123 so that the second gear 123 can drive the second orifice plate 12 to rotate, thereby enabling the manual selection of the second flow orifice 121 corresponding to the first flow orifice 111, thus realizing the switching of the resistance coefficient of the multi-range flow measurement device.

[0050] Specifically, such as Figure 3 As shown, the multi-range flow measurement device also includes a first sealing ring 124 and a second sealing ring 125, which are located on opposite sides of the second orifice plate 12 and are used to seal the connection gap between the second orifice plate 12 and the pipe 100.

[0051] Understandably, both the first sealing ring 124 and the second sealing ring 125 are used to fix themselves to the inner wall of the pipe 100 and contact the opposite sides of the second orifice plate 12, respectively. This design provides the second orifice plate 12 with rotatable conditions, while effectively improving the sealing performance of the pipe 100, preventing fluid leakage from the connection between the second orifice plate 12 and the first gear 32, and ensuring the accuracy and stability of the multi-range flow measurement device.

[0052] The arrangement of the first sealing ring 124 and the second sealing ring 125 enables the multi-range flow measurement device to better resist the influence of the external environment and maintain a good sealing condition during operation.

[0053] In some embodiments, such as Figure 1 and Figure 2 As shown, the first orifice plate 11 is equipped with a fixing ring 112. The outer peripheral wall of the fixing ring 112 is used to fix it to the inner wall of the pipe 100. The fixing ring 112 is sleeved on the first orifice plate 11.

[0054] Understandably, in the multi-range flow measurement device of the present invention, the outer peripheral wall of the fixing ring 112 is fixed to the inner wall of the pipe 100. Further, the first orifice plate 11 is embedded in the inner periphery of the fixing ring 112 so that the outer edge of the first orifice plate 11 abuts against the inner peripheral wall of the fixing ring 112.

[0055] This design allows the retaining ring 112 to better secure and support the first orifice plate 11, while ensuring the stability and reliability of the multi-range flow measurement device during operation. Simultaneously, the retaining ring 112 ensures the first orifice plate 11 is more firmly fixed to the inner wall of the pipe 100, making it less susceptible to external vibration or impact, thus improving the service life and reliability of the multi-range flow measurement device. Furthermore, the structural design of the retaining ring 112 also makes the installation and maintenance of the multi-range flow measurement device more convenient, providing users with a better experience.

[0056] Preferred, such as Figure 1 and Figure 2 As shown, the diameter of the second flow orifice 121 is larger than the diameter of the first flow orifice 111.

[0057] Understandably, the diameter of the second flow orifice 121 is larger than that of the first flow orifice 111. When the centerlines of the first flow orifice 111 and the second flow orifice 121 are coaxial, the fluid can flow directly out of the second flow orifice 121 after passing through the first flow orifice 111, resulting in minimal disturbance to the flow field. At this point, the resistance coefficient of the orifice plate 1 is minimized, and the multi-range flow measurement device has the smallest range, maximizing the measurement accuracy of the multi-range flow measurement device in this position.

[0058] In some embodiments, a plurality of first flow holes 111 are provided. The plurality of first flow holes 111 are arranged at intervals along the circumference of the first orifice plate 11. The diameter of each first flow hole 111 is different.

[0059] As the second orifice plate 12 rotates, the second flow orifice 121 corresponds to the first flow orifice 111 with different diameters.

[0060] It is understood that the present invention does not specifically limit the number of first flow passages 111. The number of first flow passages 111 can also be three, four, or six, etc. Multiple first flow passages 111 are arranged at intervals along the circumference of the first orifice plate 11. When the rotation angle of the second orifice plate 12 changes, the relative position of the second flow passage 121 and the aforementioned multiple first flow passages 111 changes, that is, the resistance coefficient of the entire orifice plate 1 changes, thereby changing the measurement range of the multi-range flow measurement device.

[0061] It should be noted that the present invention does not specifically limit the positional relationship between the plurality of first flow holes 111, as long as the linear distance between the second flow hole 121 and the first flow hole 111 on the first orifice plate 11 can change. Of course, in some embodiments, the apertures of the plurality of first flow holes 111 can also be the same.

[0062] In some embodiments, the first flow orifice 111 and the second flow orifice 121 are circular or fan-shaped. Of course, the first flow orifice 111 and the second flow orifice 121 can also be elliptical or other shapes. This invention does not specifically limit these shapes.

[0063] In other embodiments, a plurality of second orifice plates 12 are provided. Each second orifice plate 12 is rotatably disposed within the pipe 100, and the plurality of second orifice plates 12 are arranged sequentially at intervals along the flow direction of the fluid, and are all perpendicular to the inner wall of the pipe 100.

[0064] It is understood that the present invention does not specifically limit the number of second orifice plates 12. There may also be two, three, or five second orifice plates 12. The specific structure and arrangement of each second orifice plate 12 can be the same as those described above, and will not be repeated here. A greater number of second orifice plates 12 results in a finer resistance coefficient, thereby improving the versatility and measurement accuracy of the multi-range flow measurement device.

[0065] In a preferred embodiment, the distance between the first perforated plate 11 and the second perforated plate 12 is 30cm to 50cm.

[0066] Understandably, during the testing phase, the testers found that the multi-range flow measurement device achieved the highest measurement accuracy when the distance between the first orifice plate 11 and the second orifice plate 12 was between 30cm and 50cm. Users can refer to this range when setting the distance between the first orifice plate 11 and the second orifice plate 12.

[0067] Specifically, such as Figure 1 and Figure 2 As shown, the differential pressure transmitter 2 includes a pressure transmitter 21, a first pressure measuring tube 22, and a second pressure measuring tube 23. The pressure transmitter 21 is located outside the pipeline 100, and the first pressure measuring tube 22 and the second pressure measuring tube 23 are electrically connected to the pressure transmitter 21, respectively.

[0068] The first pressure measuring tube 22 is disposed on the pipe wall of the pipe 100 and located on the side of the first orifice plate 11 away from the second orifice plate 12, so as to collect the pressure of the fluid before it flows through the first orifice plate 11.

[0069] The second pressure measuring tube 23 is disposed on the pipe wall of the pipe 100 and located on the side of the second orifice plate 12 away from the first orifice plate 11, so as to collect the pressure of the fluid after flowing through the first orifice plate 11 and the second orifice plate 12.

[0070] Understandably, the differential pressure transmitter 2 is an instrument used to measure the pressure difference of a fluid. It calculates parameters such as flow velocity and flow rate by measuring the pressure of the fluid at two different locations within the pipe 100. The differential pressure transmitter 2 includes a differential pressure sensing element and a pressure transmitter 21. When fluid flows through the pipe 100, different pressures are generated at the two ends of the pipe 100 due to the arrangement of the first orifice plate 11 and the second orifice plate 12. The differential pressure sensing element collects the pressure at both ends of the pipe 100 and converts these two pressure values ​​into electrical signals, which are then transmitted to the pressure transmitter 21. After receiving the electrical signal from the differential pressure sensor, the pressure transmitter 21 calculates the difference between these two pressure values, i.e., the differential pressure value. The pressure transmitter 21 converts the calculated differential pressure value into a standard electrical signal, typically a 4mA-20mA signal or a 0V-10V signal.

[0071] Specifically, such as Figure 1 and Figure 2 As shown, the differential pressure detection element includes a first pressure measuring tube 22 and a second pressure measuring tube 23. Optionally, the first pressure measuring tube 22 and the second pressure measuring tube 23 can be piezoresistive or piezoelectric sensors. The first pressure measuring tube 22 is disposed in the pipe 100 and located on the side of the first orifice plate 11 away from the second orifice plate 12, to collect the pressure value before the fluid flows into the first orifice plate 11; the second pressure measuring tube 23 is disposed in the pipe 100 and located on the side of the second orifice plate 12 away from the first orifice plate 11, to collect the pressure value after the fluid flows out from the first flow passage 111 and the second flow passage 121.

[0072] like Figure 1 and Figure 2 As shown, the pressure transmitter 21 is located outside the pipeline 100. The first pressure measuring tube 22 and the second pressure measuring tube 23 are both electrically connected to the pressure transmitter 21 via wires.

[0073] Differential pressure transmitter 2 converts the measured pressure difference into fluid flow rate according to a pre-set program. Differential pressure transmitter 2 can be connected to a control system or display device to transmit parameters such as fluid flow rate to the control system or display device for display, thereby realizing the monitoring and control of various fluid parameters by a multi-range flow measurement device.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-range flow measurement device, characterized in that, include: An orifice plate and a differential pressure transmitter, wherein the differential pressure transmitter is used to detect the pressure difference between the fluid before and after it flows through the orifice plate; The orifice plate includes a first orifice plate and a second orifice plate. The first orifice plate is fixed to the inner wall of the pipe, and the second orifice plate is rotatably disposed in the pipe. The first orifice plate and the second orifice plate are arranged alternately along the flow direction of the fluid. The first orifice plate is provided with a first flow hole, and the second orifice plate is provided with a second flow hole. As the second orifice plate rotates, the relative positions of the first flow hole and the second flow hole change. The center point of the second flow hole does not coincide with the center point of the second orifice plate.

2. The multi-range flow measurement device according to claim 1, characterized in that, It also includes an adjustment component, which includes an adjustment handle and a first gear, wherein the first gear is sleeved on the adjustment handle and the adjustment handle is used to drive the first gear to rotate. The second perforated plate is fitted with a second gear, which meshes with the first gear to drive the second perforated plate to rotate around the central axis of the second perforated plate.

3. The multi-range flow measurement device according to claim 1, characterized in that, It also includes a first sealing ring and a second sealing ring, which are located on opposite sides of the second orifice plate and are used to seal the connection gap between the second orifice plate and the pipe.

4. The multi-range flow measurement device according to claim 1, characterized in that, The first orifice plate is equipped with a fixing ring, the outer peripheral wall of which is used to fix it to the inner wall of the pipe, and the fixing ring is sleeved on the first orifice plate.

5. The multi-range flow measurement device according to claim 1, characterized in that, The diameter of the second flow orifice is larger than the diameter of the first flow orifice.

6. The multi-range flow measurement device according to claim 1, characterized in that, The first flow passage is provided with multiple first flow passages, which are arranged at intervals along the circumference of the first orifice plate; the diameter of each first flow passage is different. As the second orifice plate rotates, the second flow orifice corresponds to the first flow orifice with a different diameter.

7. The multi-range flow measurement device according to claim 1, characterized in that, The first flow orifice and the second flow orifice are circular or fan-shaped.

8. The multi-range flow measurement device according to any one of claims 1-7, characterized in that, Multiple second orifice plates are provided, each of which is rotatably disposed inside the pipe. The multiple second orifice plates are arranged sequentially at intervals along the flow direction of the fluid and are all perpendicular to the inner wall of the pipe.

9. The multi-range flow measurement device according to claim 1, characterized in that, The distance between the first orifice plate and the second orifice plate is 30cm to 50cm.

10. The multi-range flow measurement device according to claim 1, characterized in that, The differential pressure transmitter includes a pressure transmitter, a first pressure measuring tube, and a second pressure measuring tube. The pressure transmitter is located outside the pipeline, and the first pressure measuring tube and the second pressure measuring tube are electrically connected to the pressure transmitter. The first pressure measuring tube passes through the wall of the pipe and is located on the side of the first orifice plate away from the second orifice plate, so as to collect the pressure of the fluid before it flows through the first orifice plate; The second pressure measuring tube is inserted through the wall of the pipe and located on the side of the second orifice plate away from the first orifice plate, so as to collect the pressure of the fluid after flowing through the first orifice plate and the second orifice plate.

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