Non-electric differential pressure flowmeter

Abstract

The utility model relates to the technical field of flow measuring instruments, in particular to a non-electric differential pressure flowmeter which comprises a pipeline and a pore plate arranged in the pipeline, two fixing pipes are arranged on the side wall of the pipeline and located on the two sides of the pore plate respectively, and a measuring pipe made of transparent materials is arranged between the two fixing pipes. The two sides of the measuring pipe are communicated with a pipeline through two fixing pipes respectively, two stopping plates are arranged in the measuring pipe and installed on the two sides of the measuring pipe respectively, penetrating holes are formed in the two stopping plates, the portions, on the two sides of the stopping plates, of the measuring pipe are communicated through the penetrating holes, and a floater made of light materials is arranged between the two stopping plates. The diameter of the floater is not smaller than the aperture of the through hole, and the floater is movably sleeved with the measuring pipe. The utility model provides a non-electric differential pressure flowmeter which reduces electricity consumption, is convenient for dynamically monitoring flow of a pipeline and is used for overcoming the defects in the prior art.

Description

Technical Field

[0001] The utility model relates to the technical field of flow measurement instruments, in particular to a non-electric differential pressure flowmeter. Background Art

[0002] A differential pressure flowmeter is an instrument specifically designed to measure fluid flow. Its operating principle is based on the law of conservation of energy and the law of flow continuity. When a fluid fills a pipe and flows through a throttling device, it forms a localized constriction at the throttling element, resulting in an increase in flow velocity and a decrease in static pressure. This localized constriction creates a pressure drop across the throttling element, known as a pressure differential. The greater the fluid flow rate, the greater the pressure differential across the throttling element. Therefore, by measuring this pressure differential, the fluid flow rate can be accurately measured. Commonly used differential pressure flowmeters on the market include the Bitopa, orifice, V-cone, Annubar, Vedib, Diamond, Delta, and multi-hole balanced flowmeters. Orifice flowmeters, as a type of differential pressure flowmeter, are widely used to measure the flow of fluids such as gas, steam, and liquids in pipelines. Their simple structure, easy maintenance, stable performance, and reliable operation have led to their widespread industrial application.

[0003] An orifice flowmeter consists of an orifice plate and a multi-parameter differential pressure transmitter. When fluid flows through an orifice plate in a pipeline, a localized constriction forms near the plate, increasing the flow rate. Simultaneously, a static pressure differential develops on the upstream and downstream sides of the orifice plate. The multi-parameter differential pressure transmitter converts the pressure differential across the orifice plate into a standardized electrical signal. The relationship between differential pressure and fluid flow is then derived based on the principle of flow continuity and the Bernoulli equation. Ultimately, this relationship allows accurate calculation of the flow rate through the pipeline. To achieve real-time, dynamic monitoring of the flow rate of fluid transported in a pipeline, a multi-parameter differential pressure transmitter must be used to convert the pressure differential across the orifice plate into a standardized electrical signal. This requires continuous power to the transmitter. However, long-term use of the transmitter results in significant power consumption. Furthermore, in the event of a sudden power outage in the plant, the transmitter would be unable to provide the required real-time monitoring of the flow rate of the pipeline. To address this issue, a small generator was installed in the plant to provide a temporary power source, ensuring the continued operation of the multi-parameter differential pressure transmitter to meet monitoring needs. While this approach achieved the monitoring objectives, the limited power generation capacity of the small generator made it difficult to meet the entire plant's electricity needs. Therefore, the emergency load of the small generator had to be appropriately reduced to ensure that it could provide stable power support for critical equipment.

[0004] Given this, there is room for improvement in differential pressure flowmeters to conserve electricity. By optimizing their design and improving energy efficiency, power consumption can be reduced, facilitating dynamic monitoring of pipeline flow. This not only helps better meet the demands of pipeline fluid transportation but also increases the market penetration and competitiveness of differential pressure flowmeters. These improvements ensure stable operation of differential pressure flowmeters under various power supply conditions, providing reliable data support for industrial production. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the utility model provides a non-electric differential pressure flowmeter that reduces power consumption and facilitates dynamic monitoring of pipeline flow, thereby overcoming the defects of the existing technology.

[0006] The technical solution adopted by the utility model is: a non-electric differential pressure flowmeter, including a pipeline and an orifice plate arranged in the pipeline, two fixed tubes are arranged on the side wall of the pipeline, the two fixed tubes are respectively located on both sides of the orifice plate, a measuring tube made of transparent material is arranged between the two fixed tubes, the two sides of the measuring tube are respectively connected to the pipeline through the two fixed tubes, two stop plates are arranged in the measuring tube, the two stop plates are respectively installed on both sides of the measuring tube, the two stop plates are both provided with perforations, the measuring tubes on both sides of the stop plates are connected through the perforations, a float made of lightweight material is arranged between the two stop plates, the diameter of the float is not less than the aperture of the perforation, and the float is movably sleeved in the measuring tube.

[0007] Preferably, two valves are provided on the side of the fixed tube away from the pipeline, and the two valves are respectively installed on one end of the two fixed tubes. Two transfer tubes are provided on the measuring tube, and the inner cavity of the two transfer tubes adopts an arc structure. One end of the two transfer tubes is respectively installed on the two ends of the measuring tube, and the other end of the two transfer tubes is respectively connected to the two valves.

[0008] Preferably, flanges are provided on both sides of the valve, on the side of the transfer tube close to the valve, and on the side of the fixed tube close to the valve, respectively, and the valve is connected to the transfer tube or the fixed tube via the flanges.

[0009] Preferably, a cannula is provided on both sides of the valve, the cannula is connected to the valve, one end of the cannula is installed on the valve, the cannula is movably sleeved in the transfer tube or the fixed tube, and an end of the fixed tube close to the valve and an end of the transfer tube close to the valve are respectively provided with a limiting groove of an annular structure, the limiting groove is provided on the inner wall of the transfer tube or the fixed tube, a sealing ring is interference-fitted in the limiting groove, and the sealing ring is interference-fitted on the cannula.

[0010] Preferably, the stop plate adopts a disc-shaped structure, the diameter of the stop plate matches the inner cavity diameter of the measuring tube, the number of perforations opened on the stop plate is not less than two, and several perforations are evenly opened on the stop plate along the circumferential direction of the stop plate, a fixing rod is provided on the side of the stop plate close to the float, one end of the fixing rod is installed on the stop plate, and an adjusting rod is provided below the float, one end of the adjusting rod is installed on the float, and the other end of the adjusting rod is in contact with the fixing rod below the float.

[0011] Preferably, the orifice plate is provided with a through hole, and the pipes on both sides of the orifice plate are connected through the through hole. One side of the through hole adopts a conical hole structure, and the aperture of one side of the through hole gradually increases in the direction away from the other side of the through hole.

[0012] Preferably, the measuring tube is provided with a scale layer, which is mounted on the outer wall of the measuring tube and extends from the bottom of the measuring tube to the top of the measuring tube.

[0013] The beneficial effects of the present invention are as follows: First, the present invention replaces the multi-parameter differential pressure transmitter by providing a measuring tube, a stop plate and a float. When the fluid flows through the orifice plate in the pipeline, the fluid will form a local contraction in the orifice plate, thereby increasing the flow rate and reducing the pressure, thereby generating a pressure difference on both sides of the orifice plate, causing the float in the measuring tube to rise under the action of this pressure difference. To this end, when the flow pressure pushing the float, the buoyancy of the float and the gravity of the float are equal, the float is in a balanced position. By using the height of the float as a flow measurement, the size of the fluid flow can be measured to achieve the requirement of saving electricity. Moreover, when the power is off in the factory, the size of the fluid flow can be understood by observing the height of the float, which is conducive to improving the market promotion of the differential pressure flowmeter.

[0014] Secondly, the present invention facilitates the control of the connection or closure of the measuring tube and the pipeline by providing two valves to meet the needs of detecting the fluid flow rate. The fluid flowing through the fixed tube and the valve is diverted by providing a transfer tube so that the fluid flows into the measuring tube. Moreover, the present invention facilitates the installation of the valve between the transfer tube and the fixed tube by providing a flange, thereby facilitating the installation and removal of the valve and the measuring tube to meet the needs of replacing the valve and the measuring tube, thereby facilitating the maintenance of the measuring tube. The gap between the cannula and the transfer tube or the fixed tube is sealed by providing a sealing ring and a limiting groove on both the fixed tube and the transfer tube, thereby preventing leakage between the cannula and the transfer tube or the fixed tube.

[0015] Furthermore, the present invention utilizes a conical through-hole on one side of the orifice plate to cushion the flow of fluid, thereby reducing the impact on the fluid and the pipeline. Furthermore, a graduated layer is provided on the measuring tube to facilitate understanding of the flow rate information corresponding to the height of the float, thereby facilitating understanding of the flow rate information of the fluid in the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of the present utility model.

[0017] Figure 2 It is a cross-sectional schematic diagram of the present utility model.

[0018] Figure 3 for Figure 2 Enlarged schematic diagram of point A in the middle.

[0019] Figure 4 It is a three-dimensional schematic diagram of the stop baffle of the utility model.

[0020] Figure 5 It is a three-dimensional schematic diagram of the float in the utility model. DETAILED DESCRIPTION

[0021] like Figures 1 to 5 As shown, a non-electric differential pressure flowmeter includes a pipeline 1 and an orifice plate 2 disposed within the pipeline 1. Two fixed tubes 3 are disposed on the sidewall of the pipeline 1, one on each side of the orifice plate 2. A measuring tube 4 made of a transparent material is disposed between the two fixed tubes 3. The measuring tube 4 is connected to the pipeline 1 via the two fixed tubes 3 on both sides. Two stopper plates 5 are disposed within the measuring tube 4, each of which is mounted on either side of the measuring tube 4. Each stopper plate 5 has a perforation 6 formed therein. The measuring tubes 4 on either side of the stopper plates 5 are connected via the perforations 6. A float 7 made of a lightweight material is disposed between the two stopper plates 5. The diameter of the float 7 is not less than the diameter of the perforations 6. The float 7 is movably mounted within the measuring tube 4. When fluid flows through the orifice plate 2 within the pipeline 1, it forms a localized constriction within the orifice plate 2, thereby increasing the flow rate and reducing the pressure, thereby generating a pressure differential across the orifice plate 2. Therefore, the greater the flow rate of the fluid, the greater the pressure differential generated across the orifice plate 2. Two fixed tubes 3 connect the measuring tube 4 to the pipes 1 on either side of the orifice plate 2. When fluid flows through the orifice plate 2 within the pipe 1, a pressure differential exists across the pipe 1 on either side of the orifice plate 2, causing the float 7 within the measuring tube 4 to rise under this pressure differential. When the flow pressure pushing on the float 7, the buoyancy of the float 7, and the weight of the float 7 are equal, the float 7 is in equilibrium. The height of the float 7 is then used as a flow measurement, facilitating the measurement of fluid flow. This replaces multi-parameter differential pressure transmitters, reduces power consumption, meets the requirements for dynamic pipeline flow monitoring, and ultimately contributes to the market adoption of differential pressure flowmeters.

[0022] In this embodiment, two valves 8 are provided on the side of the fixed tube 3 away from the pipeline 1. The two valves 8 are respectively installed on one end of the two fixed tubes 3. Two transfer tubes 9 are provided on the measuring tube 4. The inner cavity of the two transfer tubes 9 adopts an arc structure. One end of the two transfer tubes 9 is respectively installed on the two ends of the measuring tube 4, and the other ends of the two transfer tubes 9 are respectively connected to the two valves 8. By controlling the opening or closing of the two valves 8, it is convenient to control the connection or closure of the measuring tube 4 and the pipeline 1 to meet the needs of detecting the fluid flow rate. Through the two transfer tubes 9, the fluid flowing through the fixed tube 3 and the valve 8 is guided to be diverted so that the fluid flows into the measuring tube 4.

[0023] Specifically, flanges 10 are respectively provided on both sides of the valve 8, on the side of the transfer tube 9 close to the valve 8, and on the side of the fixed tube 3 close to the valve 8. The valve 8 is connected to the transfer tube 9 or the fixed tube 3 through the flange 10, so as to facilitate the loading and unloading of the valve 8 and the measuring tube 4, so as to facilitate the replacement of the valve 8 and the measuring tube 4, thereby facilitating the maintenance of the measuring tube 4.

[0024] Please refer again Figure 2 and 3 , a cannula 11 is provided on both sides of the valve 8, the cannula 11 is connected to the valve 8, one end of the cannula 11 is installed on the valve 8, the cannula 11 is movably sleeved in the transfer tube 9 or the fixed tube 3, and the end of the fixed tube 3 close to the valve 8 and the end of the transfer tube 9 close to the valve 8 are respectively provided with a limiting groove 12 of an annular structure, the limiting groove 12 is provided on the inner wall of the transfer tube 9 or the fixed tube 3, and a sealing ring 13 is interference-fitted in the limiting groove 12, and the sealing ring 13 is interference-fitted on the cannula 11, thereby sealing the gap between the cannula 11 and the transfer tube 9 or the fixed tube 3 to avoid leakage between the cannula 11 and the transfer tube 9 or the fixed tube 3. It should be noted that the outer diameter of the cannula 11 away from the valve 8 gradually becomes smaller to facilitate the cannula 11 to be sleeved in the transfer tube 9 or the fixed tube 3.

[0025] In this embodiment, the stop plate 5 adopts a disc-shaped structure, the diameter of the stop plate 5 is consistent with the inner diameter of the measuring tube 4, the number of perforations 6 opened on the stop plate 5 is not less than two, and several perforations 6 are evenly opened on the stop plate 5 along the circumferential direction of the stop plate 5, and a fixing rod 14 is provided on the side of the stop plate 5 close to the float 7, one end of the fixing rod 14 is installed on the stop plate 5, so as to avoid contact between the float 7 and the stop plate 5, so that the fluid flowing through the perforation 6 pushes the float 7, and an adjusting rod 15 is provided below the float 7, one end of the adjusting rod 15 is installed on the float 7, and the other end of the adjusting rod 15 is in contact with the fixing rod 14 below the float 7, and the adjusting rod 15 is used to adjust the center of gravity of the float 7 to remain in the middle of the float 7, thereby improving the stability of the float 7 rising or falling, and the diameter of the adjusting rod 15 away from the float 7 gradually decreases in the direction away from the float 7, and the diameter of the fixing rod 14 close to the float 7 gradually decreases in the direction close to the float 7.

[0026] Please refer again Figure 2 The orifice plate 2 is provided with a through hole 16, and the pipes 1 on both sides of the orifice plate 2 are connected through the through hole 16. One side of the through hole 16 adopts a conical hole structure, and the aperture of one side of the through hole 16 gradually increases in the direction away from the other side of the through hole 16, thereby buffering the flow of the fluid to reduce the impact on the fluid and the pipe 1.

[0027] In this embodiment, the measuring tube 4 is provided with a scale layer 17, which is installed on the outer wall of the measuring tube 4. The scale layer 17 extends from the bottom of the measuring tube 4 to the top of the measuring tube 4. By observing the relative position of the float 7 and the scale layer 17, the flow information corresponding to the height of the float 7 can be grasped, thereby facilitating the understanding of the flow information of the fluid in the pipeline 1.

[0028] The assembly and testing steps of this product are as follows: Please refer to Figures 1 to 5As shown, first, pipe 1 must be correctly installed in the fluid transport piping system, and a standard flowmeter must also be installed in the fluid transport piping system. After ensuring its correct positioning, valve 8 is opened and the piping system is tested to ensure that the fluid being transported during the test run can smoothly enter pipe 1 and detection tube 4. During this process, as the fluid flows through orifice plate 2 in pipe 1, it forms a localized constriction within the orifice plate 2, increasing the flow rate and reducing the pressure. This in turn creates a pressure differential across the orifice plate 2, causing float 7 to rise under the influence of this pressure differential. When the flow pressure pushing float 7, the buoyancy of float 7, and the weight of float 7 reach equilibrium, float 7 will remain in an equilibrium position. By observing the relative position of float 7 and scale layer 17, the flow rate information corresponding to the height of float 7 can be easily determined. Then, the flow rate information fed back by the standard flowmeter is read and compared with the flow rate information fed back by measuring tube 4 to determine whether the flow rate information is within the allowable error range. At the same time, the product should be carefully observed for leakage. Then, if, after comparison, it is found that the flow information of the two is within the allowable error range and the product has not leaked, then the fluid delivery can be shut down, and then the standard flow meter can be removed so that the pipeline system can be officially put into use. However, if it is found that the flow information of the two exceeds the allowable error range, or the product has leaked, then the fluid delivery should be shut down immediately so that the product can be removed for calibration and maintenance. After the calibration and maintenance work is completed, the product can be reassembled. In addition, it should be noted that since the float 7 monitors the flow rate based on the gravity of the float 7, in order to ensure the accuracy of the monitored flow rate, the float 7 must be installed in a vertical pipe in the pipeline system. This ensures that the float 7 can move up and down freely during the measurement process, thereby accurately reflecting the flow information of the fluid.

[0029] In this embodiment, the multi-parameter differential pressure transmitter is replaced by the measuring tube 4, stop plate 5, and float 7. When the fluid flows through the orifice plate 2 in the pipeline 1, the fluid forms a local contraction in the orifice plate 2, resulting in an increase in flow velocity and a decrease in pressure. This in turn creates a pressure differential on both sides of the orifice plate 2, causing the float 7 in the measuring tube 4 to rise under the action of this pressure differential. To this end, when the flow pressure pushing on the float 7, the buoyancy of the float 7, and the weight of the float 7 are equal, the float 7 is in a balanced position. By using the height of the float 7 as a flow measurement, the size of the fluid flow can be measured to achieve the requirement of saving electricity. In addition, when the power is out in the factory, the size of the fluid flow can be understood by observing the height of the float 7, which is conducive to improving the market promotion of differential pressure flowmeters.

[0030] The embodiments described above are only preferred embodiments of the present invention and do not limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made based on the structure, features and principles described in the patent scope of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. A non-electric differential pressure flowmeter, comprising a pipeline (1) and an orifice plate (2) arranged in the pipeline (1), characterized in that: Two fixed tubes (3) are provided on the side wall of the pipeline (1), and the two fixed tubes (3) are respectively located on both sides of the orifice plate (2). A measuring tube (4) made of a transparent material is provided between the two fixed tubes (3). Both sides of the measuring tube (4) are connected to the pipeline (1) through the two fixed tubes (3). Two stop plates (5) are provided in the measuring tube (4), and the two stop plates (5) are respectively installed on both sides of the measuring tube (4). Both stop plates (5) are provided with perforations (6). The measuring tubes (4) on both sides of the stop plates (5) are connected through the perforations (6). A float (7) made of a lightweight material is provided between the two stop plates (5). The diameter of the float (7) is not less than the aperture of the perforation (6). The float (7) is movably sleeved in the measuring tube (4).

2. The non-electric differential pressure flowmeter according to claim 1, characterized in that: Two valves (8) are provided on the side of the fixed pipe (3) away from the pipeline (1), and the two valves (8) are respectively installed on one end of the two fixed pipes (3). Two transfer pipes (9) are provided on the measuring pipe (4), and the inner cavity of the two transfer pipes (9) adopts an arc structure. One end of the two transfer pipes (9) is respectively installed on the two ends of the measuring pipe (4), and the other end of the two transfer pipes (9) is connected to the two valves (8).

3. The non-electric differential pressure flowmeter according to claim 2, characterized in that: Flanges (10) are respectively provided on both sides of the valve (8), on the side of the transfer tube (9) close to the valve (8), and on the side of the fixed tube (3) close to the valve (8). The valve (8) is connected to the transfer tube (9) or the fixed tube (3) via the flanges (10).

4. The non-electric differential pressure flowmeter according to claim 3, characterized in that: A cannula (11) is provided on both sides of the valve (8), the cannula (11) is connected to the valve (8), one end of the cannula (11) is installed on the valve (8), the cannula (11) is movably sleeved in the transfer tube (9) or the fixed tube (3), one end of the fixed tube (3) close to the valve (8) and one end of the transfer tube (9) close to the valve (8) are respectively provided with a limiting groove (12) of a circular ring structure, the limiting groove (12) is provided on the inner wall of the transfer tube (9) or the fixed tube (3), a sealing ring (13) is interference-fitted in the limiting groove (12), and the sealing ring (13) is interference-fitted on the cannula (11).

5. The non-electric differential pressure flowmeter according to claim 1, characterized in that: The stop plate (5) has a disc-shaped structure. The diameter of the stop plate (5) matches the inner diameter of the measuring tube (4). The number of perforations (6) provided on the stop plate (5) is not less than two. Several perforations (6) are evenly provided on the stop plate (5) along the circumferential direction of the stop plate (5). A fixing rod (14) is provided on the side of the stop plate (5) close to the float (7). One end of the fixing rod (14) is mounted on the stop plate (5). An adjusting rod (15) is provided below the float (7). One end of the adjusting rod (15) is mounted on the float (7). The other end of the adjusting rod (15) contacts the fixing rod (14) below the float (7).

6. The non-electric differential pressure flowmeter according to claim 1, characterized in that: The orifice plate (2) is provided with a through hole (16), and the pipes (1) on both sides of the orifice plate (2) are connected through the through hole (16). One side of the through hole (16) adopts a conical hole structure, and the aperture of one side of the through hole (16) gradually increases in a direction away from the other side of the through hole (16).

7. The non-electric differential pressure flowmeter according to claim 1, characterized in that: The measuring tube (4) is provided with a scale layer (17), which is mounted on the outer wall of the measuring tube (4), and extends from the bottom of the measuring tube (4) to the top of the measuring tube (4).

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