Coriolis force flowmeter
By setting up a self-generating module in the flowmeter and using the vibration generated by the fluid shock to power, the problem of the existing Coriolis force flowmeter requiring an external power supply is solved, and effective measurement and high-accuracy flow in a power-free environment are achieved Meter measurement.
Patent Information
- Application Number
- CN202420682134.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-03
- Publication Date
- 2024-12-24
- Estimated Expiration
- 2034-04-03
AI Technical Summary
The existing Coriolis power flowmeter requires an external power supply, which is difficult to apply in a power-free environment, affecting its convenience.
A self-generating module is designed. By setting a flow meter with a diversion tube, a vibrating rod, a magnet and a magnetic inductor coil, the vibration generated by the fluid impact makes the magnet cut the magnetic inductor coil, generate current power supply, and realize the self-supply of the flow meter. able.
It improves the convenience of the flowmeter, allowing it to measure flow effectively in an external power environment, and enhances its application flexibility and measurement accuracy.
Smart Images
Figure CN222231771U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of fluid measurement, in particular to a Coriolis force flowmeter. Background Art
[0002] A flow meter is an instrument used to measure the flow rate of a fluid in a pipeline. A flow meter designed using the Coriolis force principle has the advantages of being able to directly measure the flow rate and having high measurement accuracy. The Coriolis flow meter in the prior art is usually designed as a measuring tube with an electromagnetic vibrator and two vibration sensors, which measures the vibration signal when the fluid passes through the measuring tube to feedback its flow rate.
[0003] The patent named "Fluid Oscillation Flowmeter" (US3698245A) discloses a technical solution, in which a reed assembly 17 is provided in a flow channel 16. When the fluid passes through the flow channel, the reed assembly 17 generates elastic oscillations, and the sensor responds to the output, thereby calculating the flow rate of the fluid. However, the above solution requires an external power supply for measurement, which is not convenient for application in places where it is difficult to provide power. Utility Model Content
[0004] The utility model aims to provide a Coriolis force flowmeter, which uses its own measuring structure to set a self-generating module to improve the convenience of using the flowmeter.
[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is as follows: the downstream end of the liquid inlet pipe is connected with the inner cavity of the tube box-shaped watch case, a flow guide pipe is arranged in the watch case chamber, the downstream end of the flow guide pipe is connected with the liquid outlet pipe, and a valve plate of an opening and closing valve is arranged at the pipe mouth of the upstream end of the liquid outlet pipe. When the valve plate is displaced, the chamber of the watch case and the upstream end of the flow guide pipe are cut off or connected. A vibration rod is arranged in the flow guide pipe, and a sensing device is arranged on the shell wall of the watch case near the free end of the vibration rod to collect vibration signals of the vibration rod and output the collected vibration signals. The inner cavity of the watch case is divided into an isolation chamber and a water flow chamber where the flow guide pipe is arranged by the valve plate. A magnet is connected to the valve plate located on the isolation chamber side, and a magnetic induction coil is arranged in the isolation chamber, and the magnetic induction coil is arranged adjacent to the magnet.
[0006] The utility model mainly arranges a flow guide tube containing a vibration rod in the case chamber, arranges a valve plate of an opening and closing valve at the pipe mouth of the upstream end of the liquid outlet pipe, and arranges a magnet on the valve plate on the isolation chamber side, and a magnetic induction coil is arranged on the shell wall adjacent to the magnet. Whenever the valve plate is impacted by the fluid in the case chamber and vibrates, the magnet connected to the valve plate also vibrates with the vibration of the valve plate, and the vibrating magnet cuts the magnetic induction line of the magnetic induction coil to generate electricity, so that the flow meter can supply energy by itself during the measurement process. BRIEF DESCRIPTION OF THE DRAWINGS
[0007] Figure 1 is a schematic diagram of a Coriolis force flow meter case;
[0008] Figure 2 , Figure 4 They are cross-sectional views of two embodiments of the Coriolis force flowmeter;
[0009] Figure 3 Schematic diagram of the Coriolis flowmeter after removing the upper cover of the case. DETAILED DESCRIPTION
[0010] See also Figures 1 to 4 In the Coriolis flowmeter shown, the downstream end of the liquid inlet pipe 1 is connected to the inner cavity of the tube box-shaped case 3, a flow guide pipe 22 is arranged in the chamber of the case 3, the downstream end of the flow guide pipe 22 is connected to the liquid outlet pipe 2, and a valve plate 211 of an opening and closing valve 21 is arranged at the pipe mouth of the upstream end of the liquid outlet pipe 2. When the valve plate 211 is displaced, it cuts off or connects the chamber of the case 3 and the upstream end of the flow guide pipe 22. A vibration rod 30 is arranged in the flow guide pipe 22, and a sensor device 40 is arranged on the shell wall of the case 3 near the free end of the vibration rod 30 to collect vibration signals of the vibration rod 30 and output the collected vibration signals. The inner cavity of the case 3 is divided into an isolation chamber 4 and a water flow chamber where the flow guide pipe 22 is arranged by the valve plate 211. A magnet 50 is connected to the valve plate 211 located on the side of the isolation chamber 4, and a magnetic induction coil 51 is arranged in the isolation chamber 4. The magnetic induction coil 51 is arranged adjacent to the magnet 50.
[0011] In the above scheme, a cover on the case for accommodating circuit components such as circuit boards and control modules is provided above the flow meter opening and closing valve 21. A spring 5 is provided in the isolation chamber 4 of the opening and closing valve 21, and the valve plate 211 is a rubber sheet pre-stressed by the spring 5 and sealing the upstream end of the outlet pipe 2. The pre-stressed pressure of the spring 5 can be adjusted and set on the opening and closing valve 21. Preferably, the opening and closing valve 21 can adopt a pilot valve, and the opening or closing of the opening and closing valve 21 is controlled by other control mechanisms. The vibration rod 30 in the flow guide tube 22 can be fixed at one end and freely suspended at the other end. The vibration rod 30 can be made of elastic materials, such as stainless steel sheets, phosphor copper sheets and plastic sheets. The free end of the vibration rod 30 vibrates when the fluid passes through, and the sensor device 40 collects the vibration signal to the processor to measure its flow rate. The magnet 50 is connected to the valve plate 211 on the side of the isolation chamber 4. When the flow meter is working, the fluid impacts the valve plate 211 from the water flow chamber of the case 3 to open the on-off valve 21. In the process of the fluid entering the guide tube 22, the valve plate 211 vibrates due to the impact of the fluid, and the magnet 50 connected to the valve plate 211 also vibrates accordingly. During the vibration process, the magnet 50 cuts the magnetic flux lines of the magnetic induction coil 51 to generate current, which charges the capacitor and battery in the box cover on the flow meter case. The processor of the flow meter controls and supplies power to other modules, so that the flow meter can power itself during the measurement process, which improves the convenience of the flow meter measurement and enables it to still work in an environment without an external power supply.
[0012] Preferably, the magnet 50 is fixed at the center of the valve plate 211. When the valve plate 211 vibrates under the impact of the fluid, the vibration amplitude at the center of the plate surface is the largest, so fixing the magnet 50 there can maximize the current generated by the magnet 50 cutting the magnetic flux lines.
[0013] In order to obtain the vibration signal of the vibration rod 30 more accurately, the vibration rod 30 is in a strip shape, and the length direction of the vibration rod 30 is consistent with the core line direction of the guide tube 22.
[0014] Preferably, the rod core line of the vibration rod 30 coincides with the tube core line of the guide tube 22. The midstream section of the guide tube 22 is provided with a reduced diameter section 221, and the middle section of the vibration rod 30 is located in the reduced diameter section 221. In the above scheme, the strip-shaped vibration rod 30 has a larger force-bearing area during the oscillation of the fluid, which is conducive to the vibration of the free end of the vibration rod 30. The rod core line of the vibration rod 30 coincides with the tube core line of the guide tube 22, so that the tube cavities on both sides of the vibration rod 30 are symmetrical. After the fluid passes through the reduced diameter section 221 in the guide tube 22, the vortex oscillation generated by the fluid is more intense, which is convenient for the sensor device 40 to collect vibration signals.
[0015] In order to improve the range ratio of the Coriolis force flowmeter, a pulse ejector 11 is arranged on the tube wall of the flow guide tube 22, and the liquid inlet end of the pulse ejector 11 is connected to the chamber of the case 3, and the jet of the pulse ejector 11 is directed to the free end or segment of the vibration rod 30. In the above scheme, after the fluid enters from the liquid inlet end of the pulse ejector 11, it is divided into two paths at its downstream end, one path reaches the valve plate 211 of the opening and closing valve 21 along the inner cavity of the tube box-shaped case 3, and the other path enters the inner cavity of the case 3 from the liquid inlet end of the pulse ejector 11 on the tube wall. There are two possible situations here:
[0016] 1. When the fluid flow is small, the fluid pressure is small, and the fluid pressure flowing from the inner cavity of the case 3 to the valve plate 211 is not enough to open the valve plate 211. The fluid can only enter the downstream end of the inner cavity of the flow guide tube 22 from the pulse ejector 11 on the wall of the flow guide tube 22, and flow out from the liquid outlet pipe 2. Since the jet of the pulse ejector 11 points to the free end or segment of the vibration rod 30, the free end of the vibration rod 30 will vibrate under the impact of the jet. After the sensor device 40 collects the vibration signal of the vibration rod 30, the processor collects the vibration signal and processes it through the corresponding algorithm to obtain the flow rate of the fluid.
[0017] Second, when the fluid flow rate is large, the fluid pressure flowing from the inner cavity of the case 3 to the valve plate 211 is sufficient to open the valve plate 211, and the fluid enters the guide tube 22 through the on-off valve 21, forming a vortex in the guide tube 22 to vibrate the vibration rod 30. In this process, part of the fluid still enters through the liquid inlet 111 of the pulse ejector 11, and the two fluids merge at the downstream end of the guide tube 22 and flow out from the liquid outlet pipe 2. At this time, the measurement of the flow meter is based on the Coriolis force principle. The vortex in the guide tube 22 and the jet of the pulse ejector 11 merge and act on the vibration rod 30 to produce resonance. The sensor device 40 collects the vibration signal synthesized by the above two vibrations. The vibration signal obtains the magnitude of the Coriolis force generated by the fluid through the corresponding algorithm, and then measures the flow rate.
[0018] Therefore, the Coriolis force flowmeter of the present solution can measure both flow conditions mentioned above, and can measure both large flow and small flow fluids, and both have high measurement accuracy. Compared with the traditional flowmeter, the flowmeter of the present solution obviously has a larger range ratio. In the present invention, when the flowmeter measures different fluid media, it can select the corresponding vibration rod 30 with different Young's modulus according to the media with different densities. For example, when measuring water flow and air flow with similar flow rates, the Young's modulus of the vibration rod 30 used to measure the water flow is greater than the Young's modulus of the vibration rod 30 used to measure the air flow.
[0019] The outer surface of the tube wall at the downstream end of the flow guide tube 22 is connected with a partition 8 that separates the liquid inlet tube 1 and the liquid outlet tube 2. The partition 8 is annular as a whole and is obliquely placed in the chamber of the watch case 3 so that the liquid outlet tube 2 is only connected to the downstream end of the flow guide tube 22. The outer edge of the partition 8 abuts against the inner wall of the watch case 3 and a groove for accommodating a sealing ring is provided on the outer edge of the partition 8.
[0020] More specifically, a bracket 311 connected to the pipe wall is provided in the guide pipe 22 . The bracket is in an I-shape or a X-shape and is horizontally placed in the pipe. The middle section or one end of the vibration rod 30 is fixedly connected to the bracket 311 .
[0021] Preferably, the valve plate 211 of the on-off valve 21 is provided with a through hole 7 and a pressure relief valve 212, respectively. The through hole 7 connects the isolation chamber 4 and the water passage chamber. One end of the pressure relief valve 212 is located in the isolation chamber 4, and the other end extends into the flow guide pipe 22 or extends to the communication path between the flow guide pipe 22 and the liquid outlet pipe 2. In the above scheme, when the pressure relief valve 212 is closed, the fluid entering from the liquid inlet pipe 2 enters the isolation chamber 4 from the through hole 7 on the valve plate 211, and the fluid in the isolation chamber 4 generates pressure on the valve plate 211, so that the valve plate 211 is pressed and cannot be opened, and the flow meter plays a role of intercepting flow; when the pressure relief valve 212 is opened, the isolation chamber 4 of the valve plate 211 is depressurized, and the flow meter works normally.
[0022] As another preferred embodiment, the midstream section of the flow guide tube 22 is the expanded diameter section 23, and the middle section of the vibration rod 30 is located in the reduced diameter section 221. The inner cavity of the expanded diameter section 23 is provided with two diverter blocks 232 arranged symmetrically relative to the core line of the flow guide tube 22, and the diverter blocks 232 and the tube wall of the expanded diameter section 23 form a first side passage 233 and a second side passage 234, and the two diverter blocks 232 form a central channel 231, and the first side passage 233, the second side passage 234 and the central channel 231 form a parallel channel, and the central channel 231 is in an expanded diameter shape from the upstream end to the downstream end, and the inner diameter of the downstream end of the central channel 231 is larger than the inner diameter of the downstream section of the flow guide tube 22.
[0023] Preferably, the sensing device 40 includes a second magnet 401 fixed at the free end of the vibration rod 30 and a Wiegand sensor 402 arranged adjacent to the second magnet 401, and the Wiegand sensor 402 is fixed on the wall of the case 3 at the downstream end of the guide tube 22. The Wiegand sensor 402 has the advantages of not requiring an external power supply and accurate measurement. The vibration signal can be measured by using the magnet 401 in conjunction with the Wiegand sensor 402, and high-precision measurement of large and small flows can be achieved through algorithms. It should be noted that the sensing device 40 of the present invention is not limited to the above-mentioned embodiment, and the sensing device 40 may also use an angular velocity sensor, a Hall sensor, or other sensors that collect vibration signals using laser measurement, electrical measurement, or the like.
[0024] As a preferred solution, a check plate 6 is provided on the communication path between the downstream end of the flow guide pipe 22 and the liquid outlet pipe 2. The check plate 6 is hingedly connected to the outer tube wall of the flow guide pipe 22 and swings to the conducting position and the check position respectively when rotating around the hinge axis. When in the check position, the check plate 6 covers the downstream end of the flow guide pipe 22 and the tube mouth of the downstream end of the liquid outlet pipe 2 is within the plate surface of the check plate 6. When in the conducting position, a conducting path is formed between the downstream end of the flow guide pipe 22 and the liquid outlet pipe 2. The check plate 6 is connected to the outer tube wall of the flow guide pipe 22 by a hinge. Under normal working conditions, after the fluid enters from the liquid inlet pipe 1, it flows from the downstream end of the flow guide pipe 22 to the liquid outlet pipe 2. Under the impact of the fluid, the check plate 6 swings around the hinge axis to the conducting position. When the fluid enters from the liquid outlet pipe 2, the impact of the fluid causes the check plate 6 to be in the check position, thereby sealing the downstream end of the guide pipe 22, thereby cutting off the flow of the fluid.
[0025] The flow meter of the present invention can be used on a water meter or a gas meter. Preferably, an independent shell that can accommodate the electronic components of the smart water meter or gas meter is attached to the outside of the shell of the opening and closing valve 21. The shell is provided with a liquid crystal display device such as an LCD display to indicate water usage information such as the operating status of the water meter or gas meter, and a communication device for providing information to a remote management system is provided in the cavity of the shell.
[0026] When used as a smart water meter, the signal lines of the vibrating rod 30 and the sensor device 40 of the present invention are connected to the electronic circuit, and the working status of the vibrating rod 30 and the sensor device 40, and the information of the water flow flowing through the water meter can be monitored by electronic components. Through the control of the electronic circuit, the sensor device and the built-in operating software, the information such as the water flow speed and flow rate in the pipeline, whether the pipeline is leaking, whether the pipeline is overloaded, whether the water meter is working, etc. can be collected and displayed on the liquid crystal display, and provided to the remote meter reading system through wired or wireless communication.
Claims
1. A Coriolis force flowmeter, characterized in that: The downstream end of the liquid inlet pipe (1) is connected to the inner cavity of a tube box-shaped case (3); a flow guide pipe (22) is arranged in the chamber of the case (3); the downstream end of the flow guide pipe (22) is connected to the liquid outlet pipe (2); a valve plate (211) of an opening and closing valve (21) is arranged at the pipe mouth of the upstream end of the liquid outlet pipe (2); when the valve plate (211) is displaced, the chamber of the case (3) and the upstream end of the flow guide pipe (22) are cut off or connected; a vibration rod (30) is arranged in the flow guide pipe (22); the free end of the vibration rod (30) is A sensor device (40) is arranged on a shell wall adjacent to the end of the shell (3), and the sensor device (40) collects vibration signals of the vibration rod (30) and outputs the collected vibration signals. The inner cavity of the shell (3) is divided into an isolation cavity (4) and a water flow cavity in which a flow guide pipe (22) is arranged by a valve plate (211). A magnet (50) is connected to the valve plate (211) located on the isolation cavity (4) side. A magnetic induction coil (51) is arranged in the isolation cavity (4), and the magnetic induction coil (51) is arranged adjacent to the magnet (50).
2. The Coriolis force flowmeter according to claim 1, characterized in that: A pulse jet (11) is arranged on the tube wall of the flow guide tube (22), the liquid inlet end of the pulse jet (11) is connected to the chamber of the watch case (3), and the jet of the pulse jet (11) is directed to the free end or section of the vibration rod (30).
3. The Coriolis force flowmeter according to claim 1, characterized in that: The vibration rod (30) is in the shape of a strip, and the length direction of the vibration rod (30) is consistent with the direction of the core line of the flow guide tube (22).
4. The Coriolis force flowmeter according to claim 1 or 3, characterized in that: A reduced diameter section (221) is provided at the midstream section of the flow guide pipe (22), and the middle section of the vibration rod (30) is located at the reduced diameter section (221).
5. The Coriolis force flowmeter according to claim 1, characterized in that: The magnet (50) is fixed at the center of the valve plate (211).
6. The Coriolis force flowmeter according to claim 1, characterized in that: The sensing device (40) comprises a second magnet (401) fixed at the free end of the vibration rod (30) and a Wiegand sensor (402) arranged adjacent to the second magnet (401); the Wiegand sensor (402) is fixed on the wall of the meter case (3) at the downstream end of the flow guide tube (22).
7. The Coriolis force flowmeter according to claim 3, characterized in that: The rod core line of the vibration rod (30) coincides with the tube core line of the guide tube (22); a bracket (311) connected to the tube wall is provided in the guide tube (22); the bracket is in an "I" shape or a "X" shape and is horizontally placed in the pipeline; the middle section or one end of the vibration rod (30) is fixedly connected to the bracket (311).
8. The Coriolis force flowmeter according to claim 1, characterized in that: A through hole (7) and a pressure relief valve (212) are respectively provided on the valve plate (211) of the opening and closing valve (21); the through hole (7) is in communication with the isolation chamber (4) and the water passage chamber; one end of the pressure relief valve (212) is located in the isolation chamber (4), and the other end extends into the flow guide pipe (22) or extends to the communication path between the flow guide pipe (22) and the liquid outlet pipe (2).
9. The Coriolis force flowmeter according to claim 1 or 3, characterized in that: The midstream section of the flow guide pipe (22) is the diameter expansion section (23), and the middle section of the vibration rod (30) is located in the diameter reduction section (221).
10. The Coriolis force flowmeter according to claim 9, characterized in that: The inner cavity of the expanded diameter section (23) is provided with two flow dividing blocks (232) symmetrically arranged relative to the core line of the flow guiding tube (22); a first side passage (233) and a second side passage (234) are formed between the flow dividing blocks (232) and the tube wall of the expanded diameter section (23); a central channel (231) is formed between the two flow dividing blocks (232); the first side passage (233), the second side passage (234) and the central channel (231) form a parallel channel; the central channel (231) is in an expanded shape from the upstream end to the downstream end, and the inner diameter of the downstream end of the central channel (231) is larger than the inner diameter of the downstream section of the flow guiding tube (22).
11. The Coriolis force flowmeter according to claim 1, characterized in that: A check plate (6) is provided on the communication path between the downstream end of the flow guide pipe (22) and the liquid outlet pipe (2). The check plate (6) is hingedly connected to the outer pipe wall of the flow guide pipe (22) and swings to a conducting position and a check position respectively when rotating around a hinge axis. When in the check position, the check plate (6) seals the pipe opening at the downstream end of the flow guide pipe (22) and the pipe opening at the downstream end of the liquid outlet pipe (2) is within the plate surface of the check plate (6). When in the conducting position, a conducting path is formed between the downstream end of the flow guide pipe (22) and the liquid outlet pipe (2).