Flow Meter

Abstract

The present invention discloses a flow meter; the metering component is integrally embedded in the metering chamber housing, the metering component includes a metering chamber and a rotor assembly installed in the metering chamber and two brackets also installed in the metering chamber, the two brackets are respectively located at both ends of the rotor assembly, the bracket includes a cylindrical cylindrical portion, an end face bearing and a sliding bearing are sequentially embedded in the bearing seat in the axial direction of the rotor assembly, and the end of the rotating shaft of the rotor assembly passes through the sliding bearing and connects with the end face of the end face bearing; a two-stage cylindrical rectifier with a honeycomb structure is also provided at the inlet end of the metering chamber; a vacuum breaker is provided at the outlet end of the metering component, the vacuum breaker includes a body, an airflow channel and a mounting hole are provided in the body, and both ends of the airflow channel are connected to the atmosphere. The flow meter is easy to operate and has extremely high metering accuracy.

Description

Technical Field

[0001] The invention belongs to the technical field of liquid measurement, and in particular relates to a measuring instrument. Background Art

[0002] Flowmeters are widely used in daily production and life, mainly for the measurement of liquids. Usually, when the flowmeter is measuring, the flow state of the liquid being tested needs to be a stable flow state, because the liquid often becomes turbulent during the transportation process, such as the bend of the transportation pipeline, the change of the inner diameter of the pipeline, etc., which will cause the flow state of the measured liquid to change, which is a huge factor affecting the measurement accuracy. The rotor of a general flowmeter rotates very flexibly, especially the velocity flowmeter, which is small and light in size. Even the general air flow can drive the rotor to rotate, thereby causing invalid pulses and affecting the measurement accuracy. In addition, for the liquid flowing out of the flowmeter, if it encounters a diameter change, the rear end liquid will siphon the front end liquid, so it is easy to form a negative pressure area at the rear end, causing air reflux, which will also have a great impact on the accuracy of the flowmeter, so that the flowmeter must be in a very ideal environment to obtain good measurement accuracy. However, the existing flowmeter's metering components also have the defects of complex rotor assembly installation, difficult to control assembly accuracy, and large friction resistance between the rotor and the fluid when the rotor rotates under the impact of the fluid. All of the above reasons will lead to the loss of flowmeter measurement accuracy or too many limitations in use. Summary of the invention

[0003] The purpose of the present invention is to solve the above technical problems and provide a flow meter which effectively solves the technical problems of low measurement accuracy and great usage limitations of current flow meters.

[0004] The technical solution of the present invention is as follows:

[0005] A flow meter, comprising a metering component; the metering component is integrally embedded in a metering chamber housing, the metering component comprises a metering chamber, a rotor assembly installed in the metering chamber, and two brackets also installed in the metering chamber, the two brackets are respectively located at two ends of the rotor assembly, the bracket comprises a cylindrical cylindrical portion, a plurality of flow dividing ribs are connected to the cylindrical surface of the cylindrical portion in a circular array with the center of the cylindrical portion as the center, the outer edge of the flow dividing ribs is connected to the inner wall of the metering chamber and fixed in the metering chamber; a bearing seat is embedded in the end surface of one end of the cylindrical portion facing the rotor assembly, an end face bearing and a sliding bearing are sequentially embedded in the bearing seat in the axial direction of the rotor assembly, the end of the rotating shaft of the rotor assembly passes through the sliding bearing and is connected to the end face of the end face bearing; a two-stage cylindrical rectifier with a honeycomb structure is also provided at the inlet end of the metering chamber, the rectifier is directly opposite to the bracket located at the inlet end; and a pair of liquid detection sensors are provided on the inner wall of the pipe section between the two rectifiers, and the two liquid detection sensors are arranged facing each other on a horizontal plane.

[0006] [A vacuum breaker is provided at the outlet end of the metering component, and the vacuum breaker includes a body, in which an air flow channel and a mounting hole are provided, wherein the air flow channel is an air flow channel in which three sub-channels are connected end to end in sequence to form a Π-shaped air flow channel, and both ends of the air flow channel are connected to the atmosphere, and the mounting hole is vertically located between two vertically arranged sub-channels of the air flow channel, and the top end of the mounting hole is connected to the horizontal sub-channel of the air flow channel, and the bottom end thereof is connected to the outlet end of the metering component; a pressure regulating mechanism is installed in the mounting hole, and the pressure regulating mechanism includes a valve seat, a sliding sleeve, and a guide ring from top to bottom, and the valve seat is embedded in the upper part of the mounting hole, and the valve seat is The axis has a cylindrical hole and a conical hole connected to each other from top to bottom, and the large end of the conical hole faces downward, the cylindrical hole is connected to the horizontal sub-channel, and the guide ring is fixedly installed in the lower part of the mounting hole; the bottom end of the valve stem of the valve core extends out of the guide ring, and the bulged part on the top is located at the small end of the conical hole, and a cylindrical spring is sleeved on the valve stem between the guide ring and the sliding sleeve, one end of the cylindrical spring is connected to the end face of the guide ring, and the other end pushes the sliding sleeve upward so that the circumferential surface of the sealing gasket sandwiched between the bulged part and the sliding sleeve is tightly connected to the inner wall of the conical hole; the guide ring also has a through hole connecting the outlet end of the metering component and the cavity between the guide ring and the valve seat.

[0007] Preferably, the diverter rib plate includes a trapezoidal plate and a lug plate, both of which are flat-plate structures. The trapezoidal plate is in the shape of a right-angled trapezoid, and the inclined waist of the trapezoidal plate is arranged toward one end of the rotor assembly and is inclined downward toward the axis of the rotor assembly. The lug plate is integrally connected to the right-angle vertex of the other waist of the trapezoidal plate near the edge of the metering bin port, so that the lug plate and the bottom edge of the trapezoidal plate away from the cylindrical portion form a right-angled step; the metering bin is a cylindrical tubular structure, and its two ends are respectively sleeved on the steps so that the two pairs of brackets are respectively embedded and installed at the two ends of the metering bin.

[0008] Preferably, the rotor assembly is a turbine assembly, and the turbine assembly includes a core shaft and blades arranged in a spiral shape along the length direction of the core shaft; the spiral blades are provided with two blades, and the two blades have opposite rotation directions, and the two blades are respectively arranged on two opposite sides of the core shaft; a first magnetic steel is respectively embedded at both ends of each blade, and a second magnetic steel is also embedded between the two first magnetic steels on each blade, and the polarity of all the first magnetic steels facing the outer side of the blade is the same, and the polarity of the two second magnetic steels facing the outer side of the blade is opposite. Further, the blade is a double-lead blade, and each of the blades includes a measuring section and a force-bearing section connected as one body, wherein the measuring section lead is P1, and the axial length is L1, and the force-bearing section lead is P2, and the axial length is L2, P1>P2, L1>L2.

[0009] Preferably, a dust filter is provided on the top of the valve seat to completely cover the small port of the conical hole.

[0010] Preferably, the metering chamber housing is also equipped with an electronic meter head that displays flow information. The electronic meter head obtains flow information through two signal sensors installed on the metering chamber housing. The signal sensors are installed in positions so that when the turbine rotates, the two first magnets can correspond to two signal sensors respectively, and the second magnet also corresponds to one signal sensor alone.

[0011] Preferably, the inlet end of the rectifier is covered with a filter mesh for filtering.

[0012] Preferably, the rectifier is an equi-hexagonal honeycomb structure; the pore size of the hexagonal honeycomb structure is not greater than 4.8 mm, and the wall thickness is not greater than 0.1 mm.

[0013] Preferably, a steel ring is tightly clamped on the outside of the bracket, and the steel ring is a non-closed circular steel ring and is fixed by being embedded in the edge of the diversion rib plate from the radial direction of the bracket; an oil filling hole is provided on the axis of the cylindrical part, and the oil filling hole is coaxially connected with the drainage hole on the axis of the bearing seat.

[0014] Beneficial effects of the present invention: The turbine assembly installation structure of the present invention has its substantial characteristics and great beneficial effects. On the one hand, the present invention fixes the rotor assembly in the metering bin through a bracket support formed by a special array of diverter ribs, which is convenient for installation and simplifies the structure, and also allows the fluid to flow through the rotor assembly better, playing the role of diversion and support. The end face bearing and the sliding bearing are arranged in sequence in the bracket, which perfectly matches the motion state of the rotor assembly when it rotates due to fluid impact, making the rotor rotation more flexible and reliable, with less wear and longer service life, thereby ensuring the accuracy and reliability of the metering component. On the other hand, a special vacuum breaker is arranged at the outlet end of the metering component, which can prevent the vacuum environment at the outlet of the metering component from being generated, thereby effectively preventing the oil from flowing into the buried tank. When the pipe diameter becomes larger, the rear end liquid produces a siphon phenomenon on the front end liquid, fundamentally eliminating the interference of air reflux on the metering accuracy, and the vacuum breaker in the present invention has a simple and compact structure, which is easy to assemble and disassemble, and has a great promoting effect on the metering accuracy of the flow metering instrument after cooperating with the rotor assembly. In order to solve the problem of the flow state of the measured medium, the present invention specially sets up a two-stage specially made rectifier to force the liquid to change from turbulent flow to laminar flow. The rectification effect of this rectifier is much better than some existing rectifier structures, thereby improving the metering accuracy of the oil unloading metering device. And, most importantly, in order to prevent the error caused by the airflow pushing the rotor, the present invention sets up a pair of liquid detection sensors arranged in opposite directions, so that the flow meter is driven to measure only when the liquid detection sensor detects the signal of the liquid flowing through. Together with the vacuum breaker, it avoids the interference caused by air and effectively improves the metering accuracy of the flow meter. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a cross-sectional view of the present invention.

[0016] Figure 2 It is a longitudinal cross-sectional view of the metering component of the present invention.

[0017] Figure 3 Exploded view of the metering component.

[0018] Figure 4 It is a schematic diagram of the installation structure of the rotor assembly and the bracket.

[0019] Figure 5 for Figure 4 Exploded view of the structure shown.

[0020] Figure 6 A schematic diagram of the structure of a rotor assembly.

[0021] Figure 7 To adopt Figure 6 Schematic diagram of signal acquisition when the rotor assembly is shown.

[0022] Figure 8 It is a cross-sectional view of the pressure regulating mechanism.

[0023] Fig. 9 This is an exploded view of the pressure regulating mechanism.

[0024] Fig.10 Schematic diagram of the rectifier structure.

[0025] Fig.11 It is a schematic diagram of the installation of the present invention with a pair of liquid detection sensors during standard installation.

[0026] Fig.12 The present invention is a schematic diagram of an installation in which a pair of liquid detection sensors are installed with an offset.

[0027] Fig.13 Schematic diagram of different relevant radii for the same blade.

[0028] Fig.14 Motion analysis diagram at different relevant radii.

[0029] Fig.15 Schematic diagram of the relationship between the spiral angle β and the radius R at different related radii.

[0030] Fig.16 Schematic diagram of the relationship between the fluid direction and the helix angle at the relevant radius when α=β.

[0031] Fig.17 Schematic diagram of the impact of the incident angle on the flow field on the turbine surface.

[0032] Fig.18 It is a schematic diagram of the structure when the blade is a double-lead structure.

[0033] Component number description: primary rectifier 4, wire retaining ring 5, liquid detection pipe section 6, liquid detection sensor 7, metering component 8, core shaft 9, blade 10, first magnetic steel 11, second magnetic steel 12, metering bin 14, rotor assembly 15, bracket 16, rectifier 17, bearing seat 18, sliding bearing 19, rotating shaft 20, end bearing 21, oil filling hole 22, steel ring 23, diverter rib plate 24, lug plate 2401, trapezoidal plate 2402, notch 25, cylindrical part 26, body 27, sub-channel 2701, dust filter 28, valve seat 29, expansion part 30, sealing gasket 31, sliding sleeve 32, valve stem 33, cylindrical spring 34, guide ring 35, elastic retaining ring 36, secondary rectifier 37, turbine flowmeter 38, electronic meter head 39, metering chamber housing 43, signal sensor 46, temperature sensor 47. DETAILED DESCRIPTION

[0034] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0035] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0036] like Figure 1 As shown, a flowmeter, whose metering component is integrally embedded in the metering chamber housing 43, and the metering component is preferably a turbine flowmeter 38, which has a compact structure, occupies a small space, and has a high metering accuracy. The metering component is integrally embedded in the metering chamber housing 43. This is because changes in the internal pressure of the device will cause the volume of the relevant liquid to change due to compression. Due to changes in fluid pressure during calibration and operation, the collective characteristics of the traditional turbine flowmeter 38 will be changed, which will cause inaccurate measurements. The flowmeter of this embodiment adopts a dual-container design, that is, the turbine flowmeter 38 as a metering chamber component can exist as an independent unit, thereby reducing the impact of any fluid pressure changes to zero. In fact, the pressure of the measuring section in the device is the same as the pressure on the inner and outer surfaces, so this measuring section will not be affected by the fluid such as Figure 2As shown in FIG. 5 , the metering component of the present embodiment includes a metering bin 14 and a rotor assembly 15 installed in the metering bin 14, and also includes two brackets 16 also installed in the metering bin 14. The two brackets 16 are respectively located at both ends of the rotor assembly 15. The bracket 16 includes a cylindrical cylindrical portion 26. A plurality of diverter ribs 24 are connected to the cylindrical surface of the cylindrical portion 26 in a circular array with the center of the cylindrical portion 26 as the center. It is preferred that 4 diverter ribs 24 are arranged in an array. The outer edge of the diverter rib 24 is connected to the inner wall of the metering bin 14 and fixed in the metering bin 14. A bearing seat 18 is embedded in the end face of one end of the cylindrical portion 26 facing the rotor assembly 15, and an end bearing 21 and a sliding bearing 19 are embedded in the bearing seat 18 in sequence in the axial direction of the rotor assembly 15. The end of the rotating shaft 20 of the rotor assembly 15 passes through the sliding bearing 19 and is connected to the end face of the end bearing 21; the end bearing 21 and the sliding bearing 19 here can be made of graphite, which has high hardness and good self-lubricating effect, so that the rotor assembly 15 can rotate more flexibly, and the end bearing 21 limits the axial movement of the rotor assembly, and the cooperation of the sliding bearing 19 and the end bearing 21 makes the rotor rotate flexibly without generating violent vibrations during operation, which has obvious advantages over some existing installation methods using deep groove ball bearings. A two-stage cylindrical rectifier 17 (primary rectifier 4, secondary rectifier 37) with a honeycomb structure is also provided at the inlet end of the metering bin 14. The rectifier 17 is directly opposite to the bracket 16 at the inlet end. The rectifier 17 is longitudinally provided with a number of fine through holes evenly and densely distributed, and has an excellent rectifying effect, which can effectively adjust the turbulent flow to laminar flow. For the installation of the rectifier 17, a section of circular pipe can be added to the inlet end of the metering bin 14, or the metering bin 14 can be lengthened and directly installed at the inlet end of the metering bin 14. Importantly, in this embodiment, a pair of liquid detection sensors 7 are provided on the inner wall of the pipe section between the two rectifiers 17. The two liquid detection sensors 7 are arranged opposite to each other on a horizontal plane, and can be arranged in a special liquid detection pipe section 6 during manufacturing. The key point here is that a pair of liquid detection sensors 7 are provided, and the two liquid detection sensors 7 are arranged facing each other on the horizontal plane. The reason why two liquid detection sensors 7 are provided here is that there is a certain error when manually installing the flow meter, so two sensors are used to check the liquid signal. The two sensors are relatively in a horizontal position. As long as one of them has a signal, it means that there is liquid passing through the pipeline. Fig.11 As shown in Figure 12, if the sensor on the right side of these two figures is removed, then Fig.11 When the sensor is in contact with the liquid, if the entire oil unloading metering device is rotated and offset by a certain small angle during installation, it will become Fig.12In the state shown, it is obvious that the sensor on the left cannot contact the liquid, but there is indeed liquid passing through the pipeline, which will cause measurement errors. However, if two sensors are installed relatively, no matter how many degrees they are rotated during installation, at least one sensor can contact the liquid and correctly feedback the signal. The rectifier 4 is installed on the outlet pipe section 3 near its intersection with the inlet pipe section so as to play a rectifying role earlier and better.

[0037] In addition, this embodiment also provides a vacuum breaker at the outlet end of the metering component, such as Figure 8 As shown in FIG. 9 , the vacuum breaker includes a body 27, which is roughly cylindrical, and is provided with an airflow channel and a mounting hole in the body 27. The mounting hole is a stepped hole with the smallest aperture at the top. The airflow channel is an air flow channel in which three sub-channels 2701 are connected end to end in sequence to form a Π-shaped air flow channel. The Π-shaped can be a Π-shaped flow path formed by itself, or a cavity with a Π-shaped cross-section that is connected to the external atmosphere. Both ends of the airflow channel are connected to the atmosphere, and the mounting hole is vertically located between the two vertically arranged sub-channels 2701 of the airflow channel, and the top end of the mounting hole is connected to the horizontal sub-channel 2701 of the airflow channel, and the bottom end thereof is connected to the outlet end of the metering component, so that the airflow channel can be connected to the outlet end of the metering component through the mounting hole.

[0038] In this embodiment, a pressure regulating mechanism for adjusting the balance of internal and external air pressure is installed in the mounting hole, that is, the vacuum environment is broken under certain conditions. The pressure regulating mechanism includes a valve seat 29, a sleeve 32, and a guide ring 35 from top to bottom. The valve seat 29 is embedded in the upper part of the mounting hole. The axis of the valve seat 29 has a cylindrical hole and a conical hole that are connected to each other from top to bottom, and the large end of the conical hole faces downward. The cylindrical hole is connected to the horizontal sub-channel 2701. The guide ring 35 is fixedly installed in the lower part of the mounting hole, and the outer wall of the guide ring 35 is preferably coaxially embedded in the lower port of the mounting hole. The bottom end of the valve stem 33 of the valve core extends out of the guide ring 35, and the enlarged part 30 on the top is located at the small end of the conical hole, so that the valve core is similar to a rivet-like structure. A cylindrical spring 34 is sleeved on the valve stem 33 between the guide ring 35 and the sleeve 32, and one end of the cylindrical spring 34 is connected to the end face of the guide ring 35 so that the cylindrical spring 34 is squeezed upward through the guide ring 35. The other end of the cylindrical spring 34 then pushes the sleeve 32 upward, so that the sealing gasket 31 sandwiched between the expanded portion 30 and the sleeve 32 also moves upward, so that the circumferential surface of the sealing gasket 31 circle is closely connected to the inner wall of the tapered hole to achieve sealing; the guide ring 35 also has a through hole connecting the outlet end of the metering component and the cavity between the guide ring 35 and the valve seat 29.

[0039] When both the internal and external pressures are atmospheric pressure, as described above, the sealing of the vacuum breaker is achieved by the upward elastic force provided by the cylindrical spring 34; when there is positive liquid pressure inside, the liquid pressure squeezes the sealing gasket 31, further forming a reliable seal; when there is negative pressure inside the metering component, it exceeds the upward pre-pressure of the cylindrical spring 34 itself on the sealing gasket 31, and the valve core moves downward under the push of atmospheric pressure, driving the sealing gasket 31 to separate from the inner wall of the conical hole, allowing the outside atmosphere to enter the interior to prevent the formation of a vacuum environment. This embodiment uses the valve seat 29 as a conical hole to form a conical positioning with the valve core, so that the vacuum breaker can be accurately reset each time it is opened, and the sealing gasket 31 is sandwiched between the sliding sleeve 32 and the bulge 30 at the top of the valve core, which can make the sealing gasket 31 easy to install, disassemble and replace, and better cooperate with the cylindrical spring 34 to form a seal.

[0040] The outlet end of the liquid detection pipe section 6 is docked with the inlet end of the metering chamber housing 43, and the pipe hole of the liquid detection pipe section 6 is coaxially connected with the inlet end of the turbine flowmeter 38. A secondary rectifying pipe section is also provided between the liquid detection pipe section 6 and the turbine flowmeter 38. The secondary rectifying pipe section is embedded in the metering chamber housing 43 and coaxially docked with the inlet end of the turbine flowmeter 38. A secondary rectifier 37 is embedded in the secondary rectifying pipe section, and the secondary rectifier 37 is coaxially aligned with the rectifier 4 to improve the rectification performance.

[0041] In order to obtain better effect, preferably, for the installation structure of the rotor assembly, the above-mentioned diversion rib plate 24 includes a trapezoidal plate 2402 and a lug plate 2401, both of which are flat plate structures. The trapezoidal plate 2402 is in a right-angle trapezoidal shape, and the inclined waist of the two waists of the trapezoidal plate 2402 is arranged toward one end of the rotor assembly 15 and is inclined downward in the axial direction of the rotor assembly 15. The lug plate 2401 is integrally connected to the right-angle vertex of the other waist of the trapezoidal plate 2402 near the edge of the port of the metering bin 14, so that the lug plate 2401 and the bottom edge of the trapezoidal plate 2402 away from the cylindrical portion 26 form a right-angled step. The metering bin 14 is a cylindrical tubular structure, and its two ends are respectively sleeved on the steps so that the two pairs of brackets 16 are respectively embedded and installed at the two ends of the metering bin 14. This structure ensures that the fluid flows in and out smoothly, and the bracket 16 has considerable structural strength, which ensures the stability of the installation and operation of the rotor assembly 15 and provides a basis for accurate measurement. In order to improve performance, a notch 25 is provided at the right angle corner of the step, so that the right angle surface of the step can be better processed and the accuracy can be guaranteed, thereby preventing the right angle point of the step from being a non-standard right angle surface due to processing errors, which will not fit tightly with the edge surface of the port of the metering bin 14, causing the axis of the bracket 16 to deviate after installation, causing the installation axis of the rotor assembly 15 to deviate. The bottom edge of the diverter rib plate 24 is parallel to the axial direction of the cylindrical portion 26, which improves its structural strength and the performance of guiding the fluid to pass through. Figure 5As shown, the sliding bearing 19 is an annular structure, and the end bearing 21 is a cylindrical structure with a plane at one end and a spherical surface at the other end, and the arc center vertex of the spherical end is connected to the end of the rotating shaft 20. This structure better ensures the flexibility and reliability of the rotor assembly 15. In addition, preferably, an oil injection hole 22 is provided on the axis of the cylindrical portion 26, and the oil injection hole 22 is coaxially connected with the drainage hole on the axis of the bearing seat 18 to facilitate oil injection and lubrication.

[0042] The rotor assembly of this embodiment is preferably a turbine assembly, that is, the aforementioned preferred turbine flowmeter, such as Figure 6 As shown, it includes a core shaft 9 and blades 10 arranged in a spiral shape along the length direction of the core shaft 9; the spiral blades 10 are provided with two blades 10, and the two blades 10 have opposite rotation directions, and the two blades 10 are respectively arranged at two opposite sides of the core shaft 9. A first magnetic steel 11 is respectively embedded at both ends of each blade 10, and a second magnetic steel 12 is also embedded between the two first magnetic steels 11 on each blade 10. The polarity of the ends of all the first magnetic steels 11 facing the outside of the blade 10 is the same, and the polarity of the ends of the two second magnetic steels 12 facing the outside of the blade 10 is opposite. In this embodiment, each blade 10 of the turbine assembly has three magnets, and two blades 10 have a total of six magnets. The four magnets on the outer ends of the blades 10 have the same polarity, and the two middle magnets have opposite polarities. When in use, the center of the outer magnet is aligned with the signal sensor (not shown in the figure) on the flow meter housing for output of metering pulses. The two middle magnets are used to determine the direction of turbine rotation to prevent the turbine assembly from reversing and causing counting when liquid refluxes. The sensor used for the middle magnet signal detection is preferably a magnetoresistive tunnel sensor, which outputs a high level when the polarity changes from N and outputs a low level when the polarity changes from S. When determining the direction of rotation, Figure 7As shown, when rotating forward, in the period when the intermediate signal is detected as a high level, the right end output pulse is ahead of the left end output pulse, and when rotating reversely, the left end output pulse is ahead of the right end output pulse, so as to accurately determine whether the turbine assembly is reversed (oil reflux), so as to exclude the reversed data information from the metering data range. The turbine assembly is small in size, light in weight, and easy to rotate. It uses two counter-rotating blades as the rotor. The arrangement of its magnetic steel can not only accurately detect the speed information of the turbine to detect the flow information, but also realize forward and reverse detection, and exclude the fluid reflux data after the oil unloading is completed from the oil unloading metering data, making the metering more accurate, and structurally making the contact resistance between the turbine assembly and the fluid smaller, greatly improving the service life and reliability, combined with the above-mentioned installation structure of the rotor assembly, the entire metering unit can have extremely high metering accuracy and stable reliability. A steel ring 23 is tightly clamped on the outside of the bracket 16. The steel ring 23 is a non-closed circular steel ring and is radially embedded in the edge of the diverter rib 24 of the bracket 16 and fixed. All the diverter ribs 24 are connected as a whole, making the structure of the entire bracket 16 more stable.

[0043] In the vacuum breaker of this embodiment, the guide ring 35 is in the shape of a ring, and the perforation is provided on the end face of the ring; a groove for the spring retainer to be clamped and installed is provided on the inner wall of the mounting hole, and the spring retainer is clamped into the groove to push the cylindrical spring 34 upward by the upward thrust of the guide ring 35. The spring retainer occupies a small space and is easy to install. It is suitable for the installation of the guide ring here and the axial positioning of the cylindrical spring 34. It will not cause too much obstruction to the connecting port between the body 27 and the flow component, so that the ventilation is smooth. A dust filter 28 that completely covers the small port of the conical hole is also provided on the top of the valve seat 29, so that dust and debris are prevented from entering the metering component when exchanging airflow with the outside world. The body 27 is threadedly connected to the metering component for easy assembly and disassembly. The body 27 is provided with two air flow passages, which are arranged in a cross shape; or, the air flow passage includes a circular cavity located at the top of the mounting hole, and the circular cavity is surrounded by four cylindrical through holes connected thereto. These design structures can achieve a better air flow exchange effect.

[0044] Preferably, the metering chamber housing 43 is also equipped with an electronic meter head 39 that displays flow information. The electronic meter head 39 obtains flow information through two signal sensors 46 installed on the metering chamber housing. The signal sensor 46 is installed in a position so that when the turbine (rotor assembly) rotates, the two first magnetic steels 11 on the turbine surface can rotate to a position opposite to one of them, so that the signal sensor 46 obtains flow information by detecting the signal when the first magnetic steel 11 passes. In this way, the signal detection uses two signals, which can be calibrated with each other to fully ensure the metering accuracy. Correspondingly, the second magnetic steel 12 also has a corresponding signal sensor 46 to detect the forward and reverse rotation. In addition, in order to meet the customer's V20 oil delivery, the liquid flowing through can also be temperature compensated, so the flow meter is also equipped with a pt1000 temperature sensor 47 above the outlet end of the metering chamber 14, so as to compensate the flow data detected by the electronic meter head when the temperature changes to ensure the metering accuracy.

[0045] Preferably, the wall of the straight pipe section is provided with a plurality of waist holes along its circumferential direction, and all the waist holes are arranged in a circular array with the point on the axis of the straight pipe section as the center, and all the waist holes are blocked by the perspective member, so as to ensure the protection of the pipeline when the fluid flows through the pipe section, and to observe the state of the fluid intuitively. To further improve the effect, a panel is fixedly sleeved in the middle of the outlet pipe section 3 of the elbow body, and a plurality of strip-shaped convex ribs protruding outward are provided on the edge of the panel, wherein two convex ribs are 90 degrees to each other and the bisector of the angle between them is located in the vertical direction, and a handle 42 facing away from the elbow assembly is vertically fixed on the two convex ribs, so that the entire flow device can be portable by holding the handle 42.

[0046] Preferably, the inlet end of the rectifier 4 is covered with a filter screen for filtering out particles, scum and other garbage in the fluid, preventing the primary rectifier 4 from being blocked and also protecting the metering component (flow meter).

[0047] Preferably, the primary and secondary rectifiers are constructed as Fig.10 As shown, an equihexagonal honeycomb stainless steel material is used. According to the rectification capacity, the hexagonal aperture is selected to be no larger than 4.8 mm. To ensure the strength, the wall thickness is no less than 0.1 mm. The overall shape is processed into a circle, and the elbow assembly is installed and fixed with a wire retaining ring 5. An excellent rectification effect can be obtained, and the strength and installation reliability performance can be fully met.

[0048] Furthermore, the angle between the inlet pipe section and the outlet pipe section 3 of the elbow body is 10 to 30 degrees, that is, the acute angle after the intersection of the axes of the two pipe sections. The elbow assembly at this angle has better structural strength and stability, which is conducive to minimizing fluid disturbance, and is especially more suitable for docking installation at the straight pipe section of most current tanker unloading oil.

[0049] In addition, for the turbine assembly 38 of the metering component, preferably, its blades are double-lead, and each of the blades includes a measuring section and a force-bearing section connected as one body, wherein the measuring section has a lead of P1 and an axial length of L1, and the force-bearing section has a lead of P2 and an axial length of L2, then P1>P2, L1>L2, and the design basis for satisfying this parameter condition is as follows:

[0050] The different relevant radii on a blade of a turbine assembly are as follows Fig.13 As shown: the first radius (R / R0=0.2) is close to the rotor axis; the second radius is in the middle of the blade width direction; and the last radius is on the outer diameter rim surface.

[0051] The fluid flow at each radius is measured by the average velocity V in the pipe (defined below).

[0052]

[0053] and the tangential velocity Rω of a point (defined by a radius and an angular velocity), we can obtain the point velocity VR of the liquid around a solid point in rotation. VR is related to Rω and V at the corresponding radius R / R 0 as follows: Fig.14 As shown, the angle between VR and V is:

[0054]

[0055] like Fig.15 As shown, through structure and definition, the helical angle β of a spiral blade is related to the radius R, and the relationship between β, radius R and lead P is as follows:

[0056]

[0057] like Fig.16 As shown, when α=β, the incident angle between the blade surface and the fluid at any radius is zero.

[0058] In fact, due to the existence of resistance such as liquid resistance and mechanical friction, it is impossible to achieve such an ideal state. In this way, there is an incident angle between the direction of the fluid and the turbine spiral blade 10. The existence of the incident angle will cause the fluid to generate eddy currents on the blade surface, which will interfere with the metering accuracy. The interference is as follows: Fig.17 shown.

[0059] To solve this problem, Fig.18 As shown: the blade structure of the turbine assembly adopts double lead, and the blade is divided into two parts: a measuring section and a force-bearing section. The lead of the measuring section is P1, and the axial length is L1; the lead of the force-bearing section is P2, and the axial length is L2.

[0060] The design of the force section is to offset the resistance of the turbine during rotation. P1>P2 and L1>L2, thus ensuring the flow field on the measuring section. Fig.16 In the ideal state, the force-bearing section is on the fluid outlet side. Although there is an incident angle in the force-bearing section, L2 is shorter. The generated vortex is quickly pushed out of the metering area by the front liquid before it affects the turbine, so the impact on the turbine can be ignored.

[0061] During the specific production, the first magnet 11 and the second magnet 12 are both installed on the spiral edge surface of the blade 10 where they are located, so as to facilitate installation and facilitate the sensor to receive the magnet signal. The second magnet 12 is installed in the middle of the blade 10 in the axial length direction, which is also convenient for installation and facilitates the sensor to receive the magnet signal. The blade 10 is integrally formed with the core shaft 9, which improves the overall strength and stability of the entire turbine assembly and has less resistance when in contact with the liquid. A rotating shaft is coaxially embedded at both ends of the core shaft 9, one end of the rotating shaft is embedded in the end face of the core shaft 9, and the rotating shaft mounting end 13 extends out of the end face of the blade 10 for installation in the corresponding metering chamber. At the same time, since the end is most susceptible to wear, this detachable rotating shaft is also convenient for later maintenance and replacement.

[0062] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A flow meter, comprising a metering component; characterized in that: The metering component is integrally embedded in the metering chamber housing, and the metering component includes a metering bin and a rotor assembly installed in the metering bin and two brackets also installed in the metering bin, the two brackets are respectively located at both ends of the rotor assembly, the bracket includes a cylindrical cylindrical portion, on the cylindrical surface of the cylindrical portion, a plurality of diverter ribs are connected in a circular array with the center of the cylindrical portion as the center, the outer edge of the diverter rib is connected to the inner wall of the metering bin and fixed in the metering bin; a bearing seat is embedded in the end surface of one end of the cylindrical portion facing the rotor assembly, and an end face bearing and a sliding bearing are sequentially embedded in the bearing seat in the axial direction of the rotor assembly, and the end of the rotating shaft of the rotor assembly passes through the sliding bearing and connects with the end face of the end face bearing; a two-stage cylindrical rectifier with a honeycomb structure is also provided at the inlet end of the metering bin, the rectifier is directly opposite to the bracket located at the inlet end, and a pair of liquid detection sensors are provided on the inner wall of the pipe section between the two rectifiers, and the two liquid detection sensors are arranged facing each other on a horizontal plane; A vacuum breaker is provided at the outlet end of the metering component, and the vacuum breaker includes a body, in which an airflow channel and a mounting hole are provided, wherein the airflow channel is an air flow channel in which three sub-channels are connected end to end in sequence to form a Π-shaped air flow channel, and both ends of the airflow channel are connected to the atmosphere, and the mounting hole is vertically located between two vertically arranged sub-channels of the airflow channel, and the top end of the mounting hole is connected to the horizontal sub-channel of the airflow channel, and the bottom end thereof is connected to the outlet end of the metering component; a pressure regulating mechanism is installed in the mounting hole, and the pressure regulating mechanism includes a valve seat, a sliding sleeve, and a guide ring from top to bottom, and the valve seat is embedded in the upper part of the mounting hole, and the valve seat is The axis has a cylindrical hole and a conical hole connected to each other from top to bottom, and the large end of the conical hole faces downward, the cylindrical hole is connected to the horizontal sub-channel, and the guide ring is fixedly installed in the lower part of the mounting hole; the bottom end of the valve stem of the valve core extends out of the guide ring, and the bulge at the top is located at the small end of the conical hole, and a cylindrical spring is sleeved on the valve stem between the guide ring and the sliding sleeve, one end of the cylindrical spring is connected to the end face of the guide ring, and the other end pushes the sliding sleeve upward so that the circumferential surface of the sealing gasket sandwiched between the bulge and the sliding sleeve is closely connected to the inner wall of the conical hole; the guide ring also has a through hole connecting the outlet end of the metering component and the cavity between the guide ring and the valve seat; A dust filter is also provided on the top of the valve seat to completely cover the small port of the conical hole; the inlet end of the rectifier is covered with a filter for filtering; A steel ring is also tightly bound on the outside of the bracket, and the steel ring is a non-closed circular steel ring and is embedded in the edge of the diversion rib plate from the radial direction of the bracket to be fixed; an oil injection hole is provided on the axis of the cylindrical part, and the oil injection hole is coaxially connected with the drainage hole on the axis of the bearing seat; The rotor assembly is a turbine assembly, and the turbine assembly includes a core shaft and spiral blades arranged on the core shaft in a spiral shape along the length direction thereof; the spiral blades are provided with two blades, and the two blades have opposite rotation directions, and the two blades are respectively arranged on two opposite sides of the core shaft; a first magnetic steel is respectively embedded at both ends of each blade, and a second magnetic steel is also embedded between the two first magnetic steels on each blade, and the polarities of the ends of all the first magnetic steels facing the outer sides of the blades are the same, and the polarities of the ends of the two second magnetic steels facing the outer sides of the blades are opposite; The metering chamber housing is also equipped with an electronic meter head that displays flow information. The electronic meter head obtains flow information through two signal sensors installed on the metering chamber housing. The signal sensors are installed in positions so that when the turbine rotates, the two first magnetic steels can correspond to two signal sensors respectively, and the second magnetic steel also corresponds to one signal sensor alone.

2. The flow meter according to claim 1, characterized in that: The flow dividing rib plate comprises a trapezoidal plate and a lug plate, both of which are flat plate structures. The trapezoidal plate is in a right-angle trapezoidal shape. The inclined waist of the two waists of the trapezoidal plate is arranged toward one end of the rotor assembly and is inclined upward and downward toward the axis of the rotor assembly. The lug plate is integrally connected to the right-angle vertex of the other waist of the trapezoidal plate near the edge of the metering bin port, so that the lug plate and the bottom edge of the trapezoidal plate away from the cylindrical portion form a right-angled step; The metering bin is a cylindrical tubular structure, and both ends of the structure are respectively sleeved on the steps so that the two pairs of brackets are respectively embedded and installed at the two ends of the metering bin.

3. The flow meter according to claim 1, characterized in that: The blades are double-lead, and each of the blades includes a measuring section and a force-bearing section that are connected as one. The measuring section has a lead of P1 and an axial length of L1, and the force-bearing section has a lead of P2 and an axial length of L2, wherein P1>P2, and L1>L2.

4. The flow meter according to claim 1, characterized in that: All rectifiers are of equihexagonal honeycomb structure; the aperture of the hexagonal honeycomb structure is not greater than 4.8 mm, and the wall thickness is not greater than 0.1 mm.

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