Integrated high-precision elbow flow meter

Abstract

The invention relates to the technical field of flow meters, and discloses an integrated high-precision elbow flow meter which comprises a flow meter body, a filter pipe is installed at the inlet end of the flow meter body, a filter cylinder is installed in the filter pipe, one end of the filter cylinder is provided with an opening and faces water, and impellers which are coaxially arranged in a centering mode are installed in the filter cylinder. The filter pipe is installed at the inlet end of the flowmeter body, the filter barrel is arranged in the filter pipe, impurities in industrial wastewater can be intercepted, the impeller drives the first brush plate and the second brush plate to rotate, blockages in filter holes are swept, and the situation that the circulation sectional area and the measurement precision are affected due to impurity accumulation is avoided; impurities enter the impurity collector through the annular groove and the material collecting hole, waste water returns to the pipeline through the backflow pipe, circulating filtration and collection of the impurities are achieved, the impurities are discharged out of the flowmeter, the pipeline does not need to be disassembled and assembled, and later impurity cleaning work is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of flowmeters, in particular to an integrated high-precision elbow flowmeter. Background Art

[0002] In industrial production scenarios such as metallurgy and chemical engineering, elbow flowmeters are key flow measurement equipment, and their performance directly impacts the stability of production processes and product quality. However, when conveying industrial wastewater, traditional elbow flowmeters cannot filter out the large amount of particulate impurities in the wastewater, which can clog the pressure tapping holes and affect measurement accuracy. Therefore, some elbow flowmeters with impurity filtration mechanisms have emerged on the market.

[0003] Although the existing elbow flowmeter with impurity filtering function can filter impurities in industrial wastewater, as time goes by, the impurity particles gradually clog the filter holes, causing the filter structure to gradually fail. Therefore, the filter structure needs to be manually disassembled and cleaned, which is cumbersome, time-consuming and labor-intensive. Therefore, it is necessary to design a elbow flowmeter that can filter impurities in wastewater, and the flowmeter can automatically discharge impurities in the flowmeter to the outside of the pipeline. Summary of the Invention

[0004] In order to solve the technical problems existing in the background technology, the present invention proposes an integrated high-precision elbow flowmeter.

[0005] The integrated high-precision elbow flowmeter proposed in the present invention includes a flowmeter body, which includes an elbow sensor, a pressure sensor, and a transmitter. The elbow sensor includes a first elbow, a first straight pipe, a second elbow, and a second straight pipe. The two ends of the first elbow are respectively connected to a second elbow via a first straight pipe. There are two second straight pipes, which are respectively installed at the free ends of the two second elbows, and the openings of the two second straight pipes face opposite directions.

[0006] A first pressure-taking hole is provided at the middle of the inner side and the middle of the outer side of the first elbow. One end of the pressure taking device has a U-shaped opening, and second pressure-taking holes are provided on the inner walls on both sides of the opening. The pressure taking device is sleeved on the middle of the first elbow through the U-shaped opening and fixed. The first pressure-taking hole and the second pressure-taking hole are communicated with each other. The other end of the pressure taking device has a pressure-guiding hole connected to the pressure-guiding hole of the transmitter, so that the inner and outer pressures detected by the first elbow are respectively introduced into the high and low pressure diaphragm box cavities of the transmitter.

[0007] The pressure taker includes a pressure taker body, a U-shaped opening is provided at one end of the pressure taker body, the other end of the pressure taker body is connected to the pressure lead hole of the transmitter through a pressure guide hole, and a valve communicating with the inner cavity of the pressure taker body is installed on the side of the pressure taker body away from the transmitter. The number of valves is three, which are respectively set as a high-pressure valve, a low-pressure valve and a balancing valve;

[0008] The first elbow is a 90° elbow, and the second elbow is a 45° elbow. The elbow sensor is made of stainless steel and is formed by an overall half-section process. It is welded together by an automatic welding process. There is a narrow weld seam on the outside. The inside of the elbow sensor is made by CNC processing.

[0009] The present invention integrates the elbow sensor, pressure taking device and transmitter into one, solving the problem of poor compatibility of traditional split-type devices. The elbow sensor adopts a "90°+45°" combined elbow structure, which makes pressure taking more stable and reduces pressure jitter. The pressure difference between the inside and outside of the elbow is collected through the first pressure taking hole, and is directly connected to the transmitter through the U-shaped opening of the pressure taking device, shortening the pressure guide path and reducing pressure loss and leakage risks. The stainless steel overall half-section process is combined with CNC machining to ensure smooth internal flow channels, reduce fluid disturbances, and improve measurement accuracy. The three valves (high-pressure valve, low-pressure valve, and balancing valve) are convenient for on-site calibration and maintenance. For example, during maintenance, the high-pressure and low-pressure valves are closed, and the balancing valve is opened to balance the pressure to ensure safe operation.

[0010] As a further optimized solution of the present invention, when the flow meter measures industrial wastewater, the inlet and outlet ends of the flow meter body are respectively distributed up and down. It is necessary to consider the influence of particulate impurities in the industrial wastewater on the measurement accuracy of the flow meter, and the particulate impurities may also clog the pressure taking hole. Therefore, it is necessary to install a filter tube at the inlet end of the flow meter body, and a filter cylinder is installed inside the filter tube. One end of the filter cylinder is set to be open and facing the water. A coaxially aligned impeller is installed inside the filter cylinder. A cleaning component driven by the impeller to rotate and clean the filter holes is installed on the outer wall of the filter cylinder. An impurity collection component is installed at the bottom of the filter cylinder to collect impurities that have been cleaned by the cleaning component and dropped into the filter cylinder.

[0011] The filter cylinder in the filter tube intercepts impurities in the fluid (such as particles in industrial wastewater) to prevent impurities from entering the elbow sensor, wearing out the internal flow channel or clogging the pressure taking hole. The impeller rotates with the fluid flow, driving the cleaning component to automatically clean the filter holes to prevent impurities from accumulating and affecting the flow area and measurement accuracy. For example, when the fluid flows through the filter cylinder, the impeller drives the first brush plate and the second brush plate to rotate to clean the impurities in the filter holes, ensuring continuous and stable filtration efficiency and reducing the frequency of manual cleaning.

[0012] As a further optimized solution of the present invention, the cleaning assembly includes a second brush plate located on the outer circumferential surface of the filter cylinder and a first brush plate located on the bottom surface of the filter cylinder. The lower end of the impeller's rotating shaft extends to the bottom of the filter cylinder and is fixed to the end of the first brush plate. The upper end of the impeller's rotating shaft is fixed to the upper end of the second brush plate through a transmission assembly. The impeller drives the first brush plate and the second brush plate to rotate under the action of water flow to clean impurities in the filter holes on the outer wall of the filter cylinder.

[0013] The upper and lower ends of the impeller shaft are respectively connected to the first brush plate and the second brush plate to form a three-dimensional cleaning structure. The first brush plate cleans the filter holes on the bottom surface of the filter cylinder, and the second brush plate cleans the filter holes on the outer circumference to achieve full circumferential cleaning.

[0014] As a further optimized solution of the present invention, the filter cartridge includes an annular cover, an outer circle of the cartridge installed at the lower end of the annular cover, and a filter cartridge bottom installed at the lower end of the outer circle of the cartridge, the annular cover is fixed to the inner wall of the upper end of the filter tube, the interior of the annular cover has an annular cavity arranged in the center, and a gear ring arranged in the center is rotatably installed in the annular cavity through a bearing, the upper end of the second brush plate is fixed to the lower end surface of the gear ring through a connecting rod and rotates synchronously, a gear meshing with the gear ring is rotatably installed in the annular cavity, the shaft end of the gear extends to the top of the annular cover and is transmission-connected to the upper end of the rotating shaft of the impeller through a transmission mechanism;

[0015] The transmission mechanism can be a belt drive or chain drive structure in the prior art;

[0016] The lower end surface of the annular cover is provided with an annular groove adapted to the gear ring, so that when the gear drives the gear ring to rotate, the gear ring can drive the second brush plate to clean the circumference of the outer wall of the outer circle of the cylinder;

[0017] The meshing transmission between the gear and the gear ring transmits the rotational power of the impeller to the second brush plate. For example, the upper end of the impeller shaft drives the gear to rotate through the belt drive, and the gear drives the gear ring to rotate in the annular groove, and then the second brush plate is moved along the outer circumference of the cylinder through the connecting rod to achieve continuous cleaning of the filter holes. The annular groove design ensures smooth rotation of the gear ring, avoids axial deviation, and improves the reliability of the cleaning component.

[0018] As a further optimized solution of the present invention, the filter cartridge further includes an annular groove for connecting the gap between the bottom of the filter cartridge and the lower end of the outer circle of the cartridge. The bottom surface of the annular groove is provided with a collection hole connected to the feed port of the impurity collection assembly. The bottom of the filter cartridge is a hollow cone with the tip facing upward, so that impurity particles gather downward and are collected through the collection hole.

[0019] The conical design of the filter cartridge bottom guides impurity particles to converge toward the annular groove, using gravity to accelerate the movement of impurities toward the collection holes. The annular groove increases the impurity collection area, and multiple annular, symmetrically distributed collection holes ensure that impurities enter the impurity collection assembly efficiently, preventing impurities from accumulating at the bottom of the filter cartridge and affecting fluid flow and cleaning effects.

[0020] It should be noted that a scraper is also installed at the lower end of the impeller's rotating shaft, which is fitted on the upper surface of the filter cartridge bottom. The scraper extends downward along the inclined surface of the filter cartridge bottom into the annular groove and is installed with a collecting brush. When the impeller rotates, it can also drive the collecting brush to move circumferentially along the annular groove, thereby cleaning the impurities in the annular groove into the aggregate hole, facilitating the collection of impurity particles.

[0021] As a further optimized solution of the present invention, the number of the collecting holes is multiple and symmetrically distributed in an annular shape, and the number of the impurity collecting components is consistent with the number of the collecting holes and corresponds one to one;

[0022] Multiple annularly symmetrically distributed collection holes correspond one-to-one with the impurity collection components, realizing multi-point synchronous collection and avoiding impurity retention caused by single-point blockage. For example, each collection hole is connected to an independent guide pipe to evenly distribute impurities to multiple impurity collectors, improving collection efficiency, reducing pressure fluctuations inside the filter cylinder, and ensuring stable operation of the flow meter.

[0023] As a further optimized solution of the present invention, the impurity collection assembly includes an impurity collector, a guide pipe, and a return pipe. The impurity collector is arranged on the periphery of the filter tube, the inlet end of the impurity collector is connected to the bottom end of the filter cylinder through the guide pipe, and the return pipe is installed at the outlet end of the impurity collector. The free end of the return pipe extends into the filter tube and is located above the filter cylinder.

[0024] The guide pipe guides the impurities at the bottom of the filter cylinder into the impurity collector, the filter screen intercepts the impurities, and the clean fluid returns to the upstream of the filter tube through the return pipe, realizing fluid recycling. For example, after the impurities enter the impurity collector with the fluid, the particulate impurities settle into the collection barrel, and the clean fluid returns through the filter screen through the return pipe, avoiding a sudden change in flow rate of the fluid downstream of the filter cylinder due to the reduction of impurities, which affects the measurement accuracy.

[0025] As a further optimized solution of the present invention, a filter screen is installed inside the impurity collector, the lower ends of the return pipe and the guide pipe extend into the impurity collector and are respectively arranged above and below the filter screen, and the bottom thread of the impurity collector is provided with a downwardly removable collecting barrel for receiving impurities settled by gravity in the impurity collector;

[0026] The filter separates impurities from the fluid, and the impurities settle into the collection barrel due to gravity. The impurities can be cleaned by regularly rotating and removing the collection barrel without disassembling the entire filter tube, reducing maintenance difficulty. For example, the filter intercepts particles with a particle size greater than 50μm, and the collection barrel can accommodate impurities that have been cleaned multiple times. It is suitable for industrial fluid scenarios with high impurity content and reduces the frequency of downtime for maintenance.

[0027] As a further optimized solution of the present invention, a one-way valve is installed at one end of the flow guide tube (16) close to the filter cylinder (6), and the inlet of the one-way valve is connected to the bottom end of the filter cylinder (6);

[0028] A maintenance valve located outside the filter tube (4) is installed at one end of the flow guide tube (16) close to the impurity collector (15);

[0029] Specifically, the inlet of the one-way valve is connected to the collecting hole on the bottom surface of the annular groove through a guide pipe;

[0030] The one-way valve prevents the reverse flow of fluid into the filter cylinder, preventing impurities from backflowing and clogging the filter holes. For example, when the pressure in the filter cylinder fluctuates, the one-way valve closes, ensuring that impurities flow only in one direction to the impurity collector, improving the reliability of impurity collection and preventing the backflow of fluid from interfering with the normal rotation of the impeller and the operation of the cleaning component;

[0031] By installing a maintenance valve, a single flow guide pipe 16 can be opened and closed while maintaining normal filtration, so as to clean impurities in the adjacent impurity collector 15 without stopping the machine for maintenance, thereby improving actual efficiency.

[0032] As a further optimized solution of the present invention, after the filter tube is installed, a series of structures inside the filter tube will generate resistance to the water flow, which will cause water pressure loss. At present, it is mostly compensated by calibrating the flow meter directly. However, due to the large pressure loss, the calibration accuracy is low. Therefore, it is necessary to reduce the pressure loss. A pressure diffuser pipe is installed between the inlet end of the flow meter body and the outlet end of the filter tube. A pressure diffuser mechanism for reducing pressure loss and stabilizing water flow is installed inside the pressure diffuser pipe. The pressure diffuser mechanism includes a pressure diffuser cylinder. The interior of the pressure diffuser cylinder is provided with uniformly distributed pressure diffuser guide channels. The openings at both ends of the pressure diffuser guide channel are respectively connected to the inlet end and the outlet end of the pressure diffuser pipe, and the inner diameter of the pressure diffuser guide channel gradually increases from the inlet end to the outlet end of the pressure diffuser pipe.

[0033] The diffuser pipeline reduces the fluid flow rate through the gradually expanding structure of the diffuser guide channel, converts kinetic energy into static pressure energy, reduces pressure loss and stabilizes the water flow. For example, when the fluid enters the diffuser pipeline at high speed from the filter tube, the inner diameter of the diffuser guide channel gradually increases, the flow rate decreases, and the static pressure increases, so that the transmitter can still obtain a stable pressure difference signal under low flow rate conditions, solving the problem of large measurement errors of traditional elbow flowmeters at low Reynolds numbers. It is suitable for scenarios with a large range of flow rate changes, such as urban water supply and chemical fluid transportation.

[0034] The integrated high-precision elbow flowmeter proposed in the present invention has the following beneficial effects:

[0035] By installing a filter tube at the inlet end of the flow meter body and setting a filter cylinder inside the filter tube, impurities in industrial wastewater can be intercepted. The impeller drives the first brush plate and the second brush plate to rotate to clean the blockage in the filter hole, avoiding the accumulation of impurities that affect the flow cross-sectional area and measurement accuracy. Impurities enter the impurity collector through the annular groove and the aggregate hole, while the wastewater returns to the pipeline through the reflux pipe, realizing the circulation filtration and collection of impurities, and the impurities are discharged to the outside of the flow meter. There is no need to disassemble the pipeline, which facilitates the subsequent impurity cleaning work.

[0036] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 Schematic diagram of the three-dimensional structure of the flow meter body of the present invention;

[0038] Figure 2 Schematic diagram of the structure of the elbow sensor of the present invention;

[0039] Figure 3 It is a structural schematic diagram of the pressure taking assembly of the present invention;

[0040] Figure 4 Schematic diagram of the structure of an embodiment of the present invention;

[0041] Figure 5 Schematic diagram of the internal structure of the filter tube and the pressure diffuser pipe in an embodiment of the present invention;

[0042] Figure 6 Schematic diagram of the cross-sectional structure of the filter cylinder in the filter tube of the present invention;

[0043] Figure 7 Schematic diagram of the top view of the annular groove of the present invention;

[0044] Figure 8 Schematic diagram of the cross-sectional structure of the annular cover of the present invention;

[0045] Figure 9 Schematic diagram of the internal structure of the impurity collector of the present invention;

[0046] Figure 10 It is a schematic cross-sectional structural diagram of the pressure diffuser mechanism in the pressure diffuser pipeline of the present invention.

[0047] Description of the drawings: 1. Bend sensor; 101. First bend; 102. First straight pipe; 103. Second bend; 104. Second straight pipe; 105. First pressure hole; 2. Pressure taker; 201. Pressure taker body; 202. Second pressure hole; 203. Valve; 3. Transmitter; 4. Filter tube; 5. Diffuser; 6. Filter cylinder; 61. Ring cover; 62. Outer circle of cylinder; 63. Bottom of filter cylinder; 64. Ring groove; 7. Impeller; 8. Diffuser mechanism; 81. Diffuser cylinder; 82. Diffuser guide channel; 9. First brush plate; 10. Second brush plate; 11. Gear ring; 12. Gear; 13. Transmission mechanism; 14. Connecting rod; 15. Impurity collector; 16. Guide pipe; 17. Return pipe; 18. Filter screen; 19. Collecting cylinder; 20. Collecting hole. DETAILED DESCRIPTION

[0048] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar symbols throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention, and are not to be construed as limiting the present invention.

[0049] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0050] The integrated high-precision elbow flowmeter of the present invention is a flow measurement device with an integrated design. By optimizing the structural design and functional components, it achieves high-precision, high-stability and low-maintenance flow measurement. The specific implementation is as follows:

[0051] like Figure 1 As shown, the integrated high-precision elbow flowmeter is mainly composed of an elbow sensor 1, a pressure sensor 2 and a transmitter 3;

[0052] like Figure 2 As shown, the elbow sensor 1 includes a first elbow 101, a first straight pipe 102, a second elbow 103, and a second straight pipe 104. The two ends of the first elbow 101 are connected to the second elbow 103 through a first straight pipe 102, and the two second straight pipes 104 are respectively installed at the free ends of the two second elbows 103, and the openings of the two second straight pipes 104 face opposite directions, forming a V-shaped pipeline with extended ends.

[0053] A first pressure-taking hole 105 is provided in the middle of the inner side and the middle of the outer side of the first elbow 101. One end of the pressure taker 2 has a U-shaped opening, and second pressure-taking holes 202 are provided on the inner walls on both sides of the opening. The pressure taker 2 is sleeved on the middle part of the first elbow 101 through the U-shaped opening and fixed, so that the first pressure-taking hole 105 and the second pressure-taking hole 202 are connected to each other. The other end of the pressure taker 2 has a pressure guide hole, which is connected to the pressure guide hole of the transmitter 3 through the pressure guide hole, so that the inner and outer pressures detected by the first elbow 101 are respectively introduced into the high and low pressure diaphragm box cavities of the transmitter 3;

[0054] like Figure 3As shown, the pressure taker 2 includes a pressure taker body 201, a U-shaped opening is provided at one end of the pressure taker body 201, and the other end of the pressure taker body 201 is connected to the pressure lead hole of the transmitter 3 through a pressure guide hole, and a valve 203 is installed on the side of the pressure taker body 201 away from the transmitter 3 and connected to its inner cavity. The number of valves 203 is three, respectively configured as a high-pressure valve, a low-pressure valve and a balancing valve;

[0055] The elbow sensor 1 is made of stainless steel as a whole, formed by an overall half-section process, and welded together through an automatic welding process. There is a narrow weld on the outside. The inside of the elbow sensor 1 is made by CNC processing to ensure a smooth internal flow channel, reduce fluid disturbances, and improve measurement accuracy.

[0056] Example 1

[0057] like Figure 4 and Figure 5 As shown, a filter tube 4 is installed at the inlet end of the flow meter body, a filter cylinder 6 is installed inside the filter tube 4, one end of the filter cylinder 6 is set to be open and facing the water, and a coaxially aligned impeller 7 is installed inside. A cleaning component driven by the impeller 7 to rotate and clean the filter holes is installed on the outer wall of the filter cylinder 6, and an impurity collection component is installed at the bottom to collect impurities that have been cleaned by the cleaning component and dropped into the filter cylinder 6;

[0058] like Figure 5 As shown, the cleaning assembly includes a second brush plate 10 located on the outer circumferential surface of the filter cylinder 6 and a first brush plate 9 located on the bottom surface of the filter cylinder 6. The lower end of the rotating shaft of the impeller 7 extends to the bottom of the filter cylinder 6 and is fixed to the end of the first brush plate 9. The upper end of the rotating shaft of the impeller 7 is fixed to the upper end of the second brush plate 10 through a transmission assembly. The impeller 7 drives the first brush plate 9 and the second brush plate 10 to rotate under the action of water flow to clean impurities in the filter holes on the outer wall of the filter cylinder 6.

[0059] Specifically, if Figure 6 and Figure 8 As shown, the filter cylinder 6 includes an annular cover 61, an outer circle of the cylinder 62 installed at the lower end of the annular cover 61, and a filter cartridge bottom 63 installed at the lower end of the outer circle of the cylinder 62. The annular cover 61 is fixed to the inner wall of the upper end of the filter tube 4, and has a centrally arranged annular cavity inside. A centrally arranged gear ring 11 is rotatably installed in the annular cavity through a bearing. The upper end of the second brush plate 10 is fixed to the lower end surface of the gear ring 11 through a connecting rod 14 and rotates synchronously. A gear 12 meshing with the gear ring 11 is rotatably installed in the annular cavity. The shaft end of the gear 12 extends to the top of the annular cover 61 and is transmission-connected to the upper end of the rotating shaft of the impeller 7 through a transmission mechanism 13.

[0060] Furthermore, if Figure 6 and Figure 7As shown, the filter cartridge 6 further includes an annular groove 64 for connecting the gap between the filter cartridge bottom 63 and the lower end of the cartridge outer circumference 62. The bottom surface of the annular groove 64 is provided with a collection hole 20 connected to the feed port of the impurity collection assembly. The filter cartridge bottom 63 is a hollow cone with the tip facing upward, so that impurity particles can converge downward and be collected through the collection hole 20.

[0061] Furthermore, if Figure 5 and Figure 6 As shown, the impurity collection assembly includes an impurity collector 15, a flow guide pipe 16 and a return pipe 17. The impurity collector 15 is arranged on the periphery of the filter tube 4, and its inlet end is connected to the bottom end of the filter cylinder 6 through the flow guide pipe 16. The return pipe 17 is installed at the outlet end. The free end of the return pipe 17 extends into the filter tube 4 and is located above the filter cylinder 6.

[0062] Furthermore, if Figure 9 As shown, a filter screen 18 is installed inside the impurity collector 15, and the lower ends of the return pipe 17 and the guide pipe 16 extend into the impurity collector 15 and are respectively arranged above and below the filter screen 18. The bottom thread of the impurity collector 15 is provided with a downwardly removable collecting barrel 19 for receiving impurities settled by gravity in the impurity collector 15. A one-way valve is installed at one end of the guide pipe (16) close to the filter cylinder (6), and the inlet of the one-way valve is connected to the bottom end of the filter cylinder (6). A maintenance valve located outside the filter pipe (4) is installed at one end of the guide pipe (16) close to the impurity collector (15).

[0063] Based on the above embodiment 1, embodiment 2 is provided.

[0064] like Figure 4 and Figure 5 As shown, a pressure diffuser pipe 5 is installed between the inlet end of the elbow sensor 1 and the outlet end of the filter pipe 4, and a pressure diffuser mechanism 8 is installed inside the pressure diffuser pipe 5 for reducing pressure loss and stabilizing water flow;

[0065] Specifically, if Figure 10 As shown, the pressure diffuser mechanism 8 includes a pressure diffuser cylinder 81, and the pressure diffuser cylinder 81 has uniformly distributed pressure diffuser guide channels 82 formed therein. The openings at both ends of the pressure diffuser guide channels 82 are respectively connected to the inlet and outlet ends of the pressure diffuser pipeline 5, and the inner diameter of the pressure diffuser guide channels 82 gradually increases from the inlet end to the outlet end of the pressure diffuser pipeline 5.

[0066] By designing the pressure diffuser 8, compression and turbulence can be reduced, and the stability of water flow pressure can be improved, thereby improving the accuracy of subsequent detection.

[0067] Here's how it works:

[0068] During operation, the two ends of the elbow sensor 1 are vertically arranged up and down. The fluid first enters the filter cylinder 6 through the filter tube 4. The impeller 7 rotates under the action of the fluid, driving the first brush plate 9 and the second brush plate 10 to clean the impurities in the filter hole. The cleaned impurities enter the impurity collector 15 through the annular groove 64 and the collection hole 20. The cleaned fluid returns to the upstream of the filter tube 4 through the return pipe 17.

[0069] The filtered fluid then enters the pressure diffuser pipe 5, and the flow velocity is reduced and the static pressure is increased through the pressure diffuser guide channel 82 of the pressure diffuser mechanism 8 to stabilize the water flow. The stabilized fluid enters the elbow sensor 1, and a pressure difference is generated between the inside and outside of the first elbow 101. The pressure difference signal is transmitted to the pressure taker 2 through the first pressure taking hole 105 and the second pressure taking hole 202, and then transmitted to the high and low pressure diaphragm box cavity of the transmitter 3 through the pressure guide hole, and finally the flow signal is output by the transmitter 3.

[0070] It should be noted that, considering the influence of water flow resistance on flow measurement of the filter tube 4 and the diffuser pipe 5, the flow meter is calibrated after installation to compensate for the measurement error caused by water flow resistance.

[0071] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. An integrated high-precision elbow flowmeter, comprising a flowmeter body, a filter tube (4) installed at the inlet end of the flowmeter body, a filter cylinder (6) installed inside the filter tube (4), one end of the filter cylinder (6) being set to be open and facing the water, and a coaxially aligned impeller (7) installed inside the filter cylinder (6), characterized in that: The outer wall of the filter cylinder (6) is equipped with a cleaning assembly that is driven by an impeller (7) to rotate and clean the filter holes, and the bottom of the filter cylinder (6) is equipped with an impurity collection assembly for collecting impurities that fall into the filter cylinder (6) after being cleaned by the cleaning assembly; The impurity collection assembly comprises an impurity collector (15), a flow guide pipe (16), and a return pipe (17). The impurity collector (15) is arranged on the periphery of the filter tube (4). The inlet end of the impurity collector (15) is connected to the bottom end of the filter cylinder (6) through the flow guide pipe (16). The return pipe (17) is installed at the outlet end of the impurity collector (15). The free end of the return pipe (17) extends into the filter tube (4) and is located above the filter cylinder (6).

2. The integrated high-precision elbow flowmeter according to claim 1, characterized in that: The cleaning assembly comprises a second brush plate (10) located on the outer circumferential surface of the filter cylinder (6) and a first brush plate (9) located on the bottom surface of the filter cylinder (6); the lower end of the rotating shaft of the impeller (7) extends to the bottom of the filter cylinder (6) and is fixed to the end of the first brush plate (9); the upper end of the rotating shaft of the impeller (7) is fixed to the upper end of the second brush plate (10) through a transmission assembly; the impeller (7) drives the first brush plate (9) and the second brush plate (10) to rotate under the action of water flow to clean impurities in the filter holes on the outer wall of the filter cylinder (6).

3. The integrated high-precision elbow flowmeter according to claim 2, characterized in that: The filter cylinder (6) comprises an annular cover (61), an outer cylinder circle (62) mounted at the lower end of the annular cover (61), and a filter cylinder bottom (63) mounted at the lower end of the outer cylinder circle (62). The annular cover (61) is fixed to the inner wall of the upper end of the filter tube (4). The interior of the annular cover (61) has an annular cavity arranged in a central direction, and a gear ring (11) arranged in a central direction is rotatably mounted in the annular cavity via a bearing. The upper end of the second brush plate (10) is fixed to the lower end surface of the gear ring (11) via a connecting rod (14) and rotates synchronously. A gear (12) meshing with the gear ring (11) is rotatably mounted in the annular cavity. The shaft end of the gear (12) extends to the top of the annular cover (61) and is transmission-connected to the upper end of the rotating shaft of the impeller (7) via a transmission mechanism (13).

4. The integrated high-precision elbow flowmeter according to claim 3, characterized in that: The filter cylinder (6) also includes an annular groove (64) for connecting the gap between the filter cylinder bottom (63) and the lower end of the cylinder outer circle (62). The bottom surface of the annular groove (64) is provided with a collection hole (20) connected to the feed port of the impurity collection component.

5. The integrated high-precision elbow flowmeter according to claim 4, characterized in that: The number of the material collecting holes (20) is multiple and distributed in an annular symmetrical manner, and the number of the impurity collecting components is consistent with the number of the material collecting holes (20) and corresponds one to one.

6. The integrated high-precision elbow flowmeter according to claim 1, characterized in that: A filter screen (18) is installed inside the impurity collector (15). The lower ends of the return pipe (17) and the guide pipe (16) extend into the impurity collector (15) and are respectively arranged above and below the filter screen (18). The bottom thread of the impurity collector (15) is provided with a downwardly removable collecting barrel (19) for receiving impurities settled by gravity in the impurity collector (15).

7. The integrated high-precision elbow flowmeter according to claim 1, characterized in that: A one-way valve is installed at one end of the flow guide tube (16) close to the filter cylinder (6), and the inlet of the one-way valve is connected to the bottom end of the filter cylinder (6); One end of the flow guide pipe (16) close to the impurity collector (15) is provided with a maintenance valve located outside the filter pipe (4).

8. The integrated high-precision elbow flowmeter according to claim 1, characterized in that: A pressure diffusion pipeline (5) is installed between the inlet end of the flow meter body and the outlet end of the filter tube (4), and a pressure diffusion mechanism (8) for reducing pressure loss and stabilizing water flow is installed inside the pressure diffusion pipeline (5).

9. The integrated high-precision elbow flowmeter according to claim 8, characterized in that: The pressure diffuser mechanism (8) comprises a pressure diffuser cylinder (81), wherein uniformly distributed pressure diffuser guide channels (82) are provided inside the pressure diffuser cylinder (81), and the openings at both ends of the pressure diffuser guide channels (82) are respectively connected to the inlet end and the outlet end of the pressure diffuser pipeline (5), and the inner diameter of the pressure diffuser guide channels (82) gradually increases from the inlet end to the outlet end of the pressure diffuser pipeline (5).

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