A turbine flowmeter with impeller cleaning function

Abstract

The present application relates to the field of automated instrumentation, and in particular to a turbine flowmeter with an impeller cleaning function, the turbine flowmeter with an impeller cleaning function comprising a flow tube and an impeller, the impeller being rotatably arranged in the flow tube, a rotating magnetic field device being arranged on the outside of the flow tube, the rotating magnetic field device being arranged corresponding to the impeller, the rotating magnetic field device being used to drive the impeller to rotate, and enhancing the disturbance of the fluid on the surface of the impeller; the rotating magnetic field device comprising a rotating bracket and a magnet, the rotating bracket being sleeved on the outside of the flow tube, the rotating bracket being rotatably connected to the flow tube, the rotating bracket being provided with a driving member, the driving member being used to drive the rotating bracket to rotate, 2N magnets being provided, N≥3, the magnets being evenly distributed around the flow tube, the polarities of the magnets being alternately arranged, the magnets being arranged parallel to the central axis of the impeller, and the magnets being fixedly connected to the rotating bracket, thereby achieving the effect of reducing the maintenance cost of the flowmeter.

Description

Technical Field

[0001] The present application relates to the field of automated instruments, and in particular to a turbine flowmeter with an impeller cleaning function. Background Art

[0002] Turbine flowmeters currently offer high accuracy, excellent repeatability, simple structure, wide measurement range, minimal pressure loss, and easy maintenance. They are widely used to measure the flow of various gases and liquids in fields such as petroleum, chemical engineering, metallurgy, urban gas pipelines, aviation, and scientific research.

[0003] The existing turbine flowmeter is a velocity-type instrument. When the medium enters the flowmeter, under the action of the fluid, the turbine blades form a certain angle with the fluid flow direction, and the turbine generates a rotational torque. After the turbine overcomes the resistance torque and friction torque, it begins to rotate. When the torques reach equilibrium, the speed stabilizes, and the turbine rotational angular velocity is linearly related to the flow rate. The magnet on the rotating signal wheel periodically changes the sensor magnetic resistance, so that the signal detection probe senses a pulse signal proportional to the fluid volume flow rate. The signal is amplified and shaped by the preamplifier and then transmitted to the flow calculator for processing, thereby directly displaying the volume flow rate and total volume.

[0004] Flow meters control the flow of various liquids. The flow meters that people come into contact with in daily life are tap water flow meters, which monitor people's daily water consumption.

[0005] The above-mentioned existing technical solutions have the following defects: since tap water contains substances that are slightly soluble in water, long-term use will cause these substances to adhere to the turbine blades and affect the rotation of the turbine blades, causing the flow meter to measure inaccurately. Therefore, it is necessary to stop the machine and disassemble and clean the flow meter, resulting in high maintenance costs for the flow meter. Summary of the Invention

[0006] In order to reduce the maintenance cost of the flowmeter, the present application provides a turbine flowmeter with an impeller cleaning function.

[0007] The above technical objectives of this application are achieved through the following technical solutions:

[0008] A turbine flowmeter with an impeller cleaning function includes a flow tube and an impeller. The impeller is rotatably arranged in the flow tube. A rotating magnetic field device is arranged outside the flow tube and corresponds to the impeller. The rotating magnetic field device is used to drive the impeller to rotate and enhance the disturbance of the fluid on the impeller surface.

[0009] The rotating magnetic field device includes a rotating bracket and a magnet. The rotating bracket is sleeved on the outside of the flow tube and is rotatably connected to the flow tube. The rotating bracket is provided with a driving member, which is used to drive the rotating bracket to rotate. There are 2N magnets, N≥3, and the magnets are evenly distributed around the flow tube. The polarities of the magnets are arranged alternately. The magnets are arranged parallel to the central axis of the impeller, and the magnets are fixedly connected to the rotating bracket.

[0010] Furthermore, the rotating bracket includes an end bracket and a connecting rod. There are two end brackets, which are arranged in parallel. There are several connecting rods, and the two ends of the connecting rod are fixedly connected to the two end brackets respectively. The magnet is arranged between two adjacent connecting rods.

[0011] Furthermore, a mounting groove is provided on the connecting rod, and the edge of the magnet is engaged with the mounting groove. A fixing component is provided between the connecting rod and the magnet, and the fixing component is used to fix the magnet and the connecting rod.

[0012] Furthermore, the fixing assembly includes a hoop and a fixing bolt. There are several hoops, which are all sleeved on the outside of the rotating bracket. Each hoop is correspondingly provided with a fixing bolt, and the fixing bolt fixes the hoop to the connecting rod.

[0013] Furthermore, a shielding cover is provided on the outside of the rotating bracket, and the shielding cover is fixedly connected to the flow tube. The shielding cover is used to reduce the leakage of the magnetic field of the magnet and reduce interference with other external devices.

[0014] Furthermore, the driving member is fixedly connected to the shielding cover, and a transmission assembly is provided between the driving member and the rotating bracket. The transmission assembly includes a driving gear and a gear ring. The transmission assembly is located inside the shielding cover. The output shaft of the driving member passes through the outer shell of the shielding cover and is fixedly connected to the driving gear. The gear ring is fixedly connected to the rotating bracket, and the gear ring is engaged with the driving gear.

[0015] Furthermore, a rotating assembly is provided between the rotating bracket and the flow tube, and the rotating assembly includes an outer ring and an inner ring. The inner ring is sleeved on the outside of the flow tube and fixedly connected to the flow tube, and the outer ring is sleeved on the outside of the inner ring. The outer ring and the inner ring are arranged correspondingly, and the outer ring is fixedly connected to the rotating bracket.

[0016] Furthermore, a friction-reducing assembly is provided between the inner ring and the outer ring, and the friction-reducing assembly includes a friction-reducing groove and friction-reducing balls. The friction-reducing grooves are provided on the opposite sides of the inner ring and the outer ring, and the friction-reducing balls are located in the friction-reducing grooves. The friction-reducing balls are used to reduce the friction between the inner ring and the outer ring.

[0017] Furthermore, the impeller is made of magnetic conductive material to ensure that the magnetic field can effectively penetrate and generate torque.

[0018] In summary, this application has the following technical effects:

[0019] 1. A rotating bracket drives the magnet to rotate, creating a rotating magnetic field. Electromagnetic induction acts on the magnetic material in the impeller, generating periodic torque that drives the impeller's rotation. Simultaneously, the interaction between the magnetic field and the conductive fluid stimulates the Lorentz force, increasing the fluid's turbulence and creating a "magnetic field-fluid-impeller" coupling disturbance effect. This disrupts the adhesion of impurities to the impeller surface, allowing for clean impellers. This eliminates the need to shut down the flowmeter for disassembly and cleaning, reducing maintenance costs.

[0020] 2. By installing a magnet between adjacent connecting rods and fixing the magnet to the connecting rods through a hoop and fixing bolts, the connection between the magnet and the rotating bracket is more stable, preventing the magnet from separating from the rotating bracket during the rotation of the rotating bracket;

[0021] 3. By setting up an inner ring and an outer ring, and setting a friction-reducing component between the inner ring and the outer ring, the friction between the inner ring and the outer ring during rotation is reduced, which increases the service life of the rotating bracket. At the same time, it reduces the friction that needs to be overcome when the bracket rotates, thereby improving the stability of the rotating bracket during rotation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram of a turbine flowmeter with an impeller cleaning function according to the present application;

[0023] Figure 2 This is a schematic diagram of the structure of the present application after the flow tube and shielding cover are opened;

[0024] Figure 3 This is a schematic diagram showing the structure of the rotating assembly and the friction reducing assembly of the present application;

[0025] Figure 4 It is a schematic diagram showing the structure of the rotating magnetic field device and the impeller;

[0026] Figure 5 It is a schematic diagram showing the structure of the rotating component and the anti-friction component.

[0027] In the figure, 1. flow tube; 2. impeller; 3. rotating magnetic field device; 31. rotating bracket; 311. end bracket; 312. connecting rod; 32. magnet; 4. fixing assembly; 41. hoop; 42. fixing bolt; 5. shielding cover; 6. transmission assembly; 61. driving gear; 62. gear ring; 7. rotating assembly; 71. outer ring; 72. inner ring; 8. friction reducing assembly; 81. friction reducing groove; 82. friction reducing ball. DETAILED DESCRIPTION

[0028] The present application is further described in detail below with reference to the accompanying drawings.

[0029] Reference Figure 1 and Figure 2 , a turbine flowmeter with an impeller cleaning function provided in this embodiment includes a flow tube 1 and an impeller 2, the impeller 2 is rotatably arranged in the flow tube 1, and a rotating magnetic field device 3 is arranged on the outside of the flow tube 1, and the rotating magnetic field device 3 is arranged corresponding to the impeller 2. The rotating magnetic field device 3 is used to drive the impeller 2 to rotate and enhance the disturbance of the fluid on the surface of the impeller 2; in this embodiment, the impeller 2 is preferably made of a magnetic conductive material to ensure that the magnetic field can effectively penetrate and generate torque. The materials suitable for making the impeller 2 can be selected from: 304 stainless steel, 410 stainless steel or iron-cobalt alloy, etc.; if the original impeller 2 is a non-magnetic conductive material (such as plastic or ceramic), a thin layer of magnetic conductive metal (thickness 0.5-1mm) needs to be wrapped on the surface of the impeller 2.

[0030] Reference Figure 2 and Figure 3 The rotating magnetic field device 3 includes a rotating bracket 31 and a magnet 32. The rotating bracket 31 is sleeved on the outside of the flow tube 1. The rotating bracket 31 is rotatably connected to the flow tube 1. The rotating bracket 31 is provided with a driving member, which is used to drive the rotating bracket 31 to rotate. There are 2N magnets 32, where N≥3. Several magnets 32 are evenly distributed around the flow tube 1. The polarities of the magnets 32 are arranged alternately. The magnets 32 are arranged parallel to the central axis of the impeller 2. The magnets 32 are fixedly connected to the rotating bracket 31.

[0031] Reference Figure 2 and Figure 3 The rotating bracket 31 includes an end bracket 311 and a connecting rod 312. There are two end brackets 311, and the two end brackets 311 are arranged in parallel. The end bracket 311 is a polygonal structure, and several magnets 32 are arranged, that is, the end bracket 311 is a polygonal structure, and each magnet 32 ​​corresponds to an edge of the end bracket 311; there are several connecting rods 312, and the end bracket 311 is arranged as a polygon, and the connecting rod 312 is arranged as a few. The two ends of the connecting rod 312 are fixedly connected to the two end brackets 311 respectively, and the magnet 32 ​​is arranged between two adjacent connecting rods 312. In the example, six magnets 32 are provided, the end bracket 311 is hexagonal, and six connecting rods 312 are provided; a mounting groove is provided on the connecting rod 312, and the edge of the magnet 32 ​​is snap-fitted with the mounting groove, and a fixing component 4 is provided between the connecting rod 312 and the magnet 32, and the fixing component 4 is used to fix the magnet 32 ​​and the connecting rod 312; the fixing component 4 includes a hoop 41 and a fixing bolt 42, and a plurality of hoop rings 41 are provided, and the plurality of hoop rings 41 are all sleeved on the outside of the rotating bracket 31, and each hoop ring 41 is correspondingly provided with a fixing bolt 42, and the fixing bolt 42 fixes the hoop 41 to the connecting rod 312.

[0032] Reference Figure 3 and Figure 4A shielding cover 5 is provided on the outside of the rotating bracket 31, and the shielding cover 5 is fixedly connected to the flow tube 1. The shielding cover 5 is used to reduce the leakage of the magnetic field of the magnet 32 ​​and reduce interference with other external devices; the driving member is fixedly connected to the shielding cover 5, and a transmission assembly 6 is provided between the driving member and the rotating bracket 31. The transmission assembly 6 includes a driving gear 61 and a gear ring 62. The transmission assembly 6 is located in the shielding cover 5, and the output shaft of the driving member passes through the outer shell of the shielding cover 5 and is fixedly connected to the driving gear 61. The gear ring 62 is fixedly connected to the rotating bracket 31, and the gear ring 62 is engaged with the driving gear 61.

[0033] Reference Figure 4 and Figure 5 A rotating assembly 7 is provided between the rotating bracket 31 and the flow tube 1. The rotating assembly 7 includes an outer ring 71 and an inner ring 72. The inner ring 72 is sleeved on the outside of the flow tube 1 and fixedly connected to the flow tube 1. The outer ring 71 is sleeved on the outside of the inner ring 72. The outer ring 71 and the inner ring 72 are correspondingly arranged. The outer ring 71 is fixedly connected to the rotating bracket 31; a friction reducing assembly 8 is provided between the inner ring 72 and the outer ring 71. The friction reducing assembly 8 includes a friction reducing groove 81 and friction reducing balls 82. The friction reducing groove 81 is provided on the opposite side of the inner ring 72 and the outer ring 71. The friction reducing balls 82 are located in the friction reducing groove 81. The friction reducing balls 82 are used to reduce the friction between the inner ring 72 and the outer ring 71.

[0034] To facilitate understanding by those skilled in the art, since the rotating magnetic field device 3 is arranged at the position of the impeller 2, the rotational speed of the turbine cannot be directly measured using a measuring probe. Therefore, it is necessary to adjust the position of the measuring probe and use the measuring probe to measure the components in the turbine flowmeter that are rigidly connected to or rotate synchronously with the impeller 2. It is preferred to measure the rigid impeller 2 axis connected to the impeller 2. Since the rotating magnetic field device 3 drives the impeller 2 to rotate, errors will occur in the measured value of the medium flow rate. This application explains how to eliminate the measurement error: under the premise that the rotating bracket 31 rotates at a uniform speed, data are measured together in the laboratory using an ordinary flowmeter and the flowmeter of this application, and the difference between the two flowmeters is calculated to obtain the error coefficient. Then, the error coefficient operation is added to the measurement value calculation system of the flowmeter of this application to obtain an accurate flow value.

[0035] The technical solution in the present application also has the effects of low starting and low pressure loss, wherein low starting means having a low starting flow rate, and the starting flow rate refers to the minimum fluid thrust required for the impeller 2 to start rotating from a standstill, which depends on the rotational inertia of the impeller 2, the fluid torque and the mechanical friction resistance; the core of low pressure loss is to reduce the energy loss of the fluid during the flow process, which is mainly determined by the along-the-line resistance (friction between the fluid and the pipe wall) and the local resistance (kinetic energy loss of the fluid flowing through the impeller 2, elbows and other components). Therefore, in the technical solution of the present application, the rotating magnetic field device 3 drives the impeller 2 to rotate, which can reduce the impeller's rotational inertia and the kinetic energy loss of the fluid flowing through the impeller, thereby achieving the effects of low starting and low pressure loss of the flowmeter.

[0036] The implementation principle of a turbine flowmeter with an impeller cleaning function in an embodiment of the present application is as follows: when using the turbine flowmeter, first connect the flow tube 1 to the medium conveying pipeline, and at the same time start the driving part to drive the driving gear 61 to rotate, the driving gear 61 drives the gear ring 62 to rotate, and the gear ring 62 thereby drives the rotating bracket 31 to rotate, and the rotating bracket 31 drives multiple magnets 32 to rotate to form a rotating magnetic field with uniform rotation. At this time, the magnetic field generated by the rotating magnetic field passes through the flow tube 1 and acts on the magnetic conductive material on the impeller 2, generating a periodic torque to drive the impeller 2 to rotate. At this time, the medium will interact with the magnetic field during the flow process to stimulate the Lorentz magnetic force, enhance the turbulence intensity of the fluid, form a "magnetic field-fluid-impeller 2" coupling disturbance effect, destroy the adhesion between impurities and the surface of the impeller 2, and no longer need to stop the flowmeter for disassembly and cleaning, thereby achieving the purpose of reducing the maintenance cost of the flowmeter.

[0037] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A turbine flowmeter with an impeller cleaning function, comprising a flow tube (1) and an impeller (2), wherein the impeller (2) is rotatably arranged in the flow tube (1), and is characterized in that: A rotating magnetic field device (3) is provided on the outside of the flow tube (1), the rotating magnetic field device (3) is provided corresponding to the impeller (2), and the rotating magnetic field device (3) is used to drive the impeller (2) to rotate and enhance the disturbance of the fluid on the surface of the impeller (2); The rotating magnetic field device (3) comprises a rotating bracket (31) and a magnet (32), wherein the rotating bracket (31) is sleeved on the outside of the flow tube (1), the rotating bracket (31) is rotatably connected to the flow tube (1), the rotating bracket (31) is provided with a driving member, and the driving member is used to drive the rotating bracket (31) to rotate, and 2N magnets (32) are provided, wherein N is greater than or equal to 3, the magnets (32) are evenly distributed around the flow tube (1), the polarities of the magnets (32) are alternately arranged, the magnets (32) are arranged parallel to the central axis of the impeller (2), and the magnets (32) are fixedly connected to the rotating bracket (31); The rotating bracket (31) comprises an end bracket (311) and a connecting rod (312), two end brackets (311) are provided, and the two end brackets (311) are arranged in parallel, and a plurality of connecting rods (312) are provided, and both ends of the connecting rod (312) are fixedly connected to the two end brackets (311) respectively, and the magnet (32) is arranged between two adjacent connecting rods (312); The connecting rod (312) is provided with a mounting groove, the edge of the magnet (32) is engaged with the mounting groove, and a fixing component (4) is provided between the connecting rod (312) and the magnet (32), and the fixing component (4) is used to fix the magnet (32) and the connecting rod (312); The fixing assembly (4) includes a hoop (41) and a fixing bolt (42). A plurality of hoop rings (41) are provided. The plurality of hoop rings (41) are sleeved on the outside of the rotating bracket (31). Each hoop ring (41) is correspondingly provided with a fixing bolt (42). The fixing bolt (42) fixes the hoop ring (41) to the connecting rod (312). The impeller (2) is made of a magnetically conductive material and is used to ensure that the magnetic field can effectively penetrate and generate torque.

2. The turbine flowmeter with impeller cleaning function according to claim 1, characterized in that: A shielding cover (5) is provided on the outside of the rotating bracket (31), and the shielding cover (5) is fixedly connected to the flow tube (1). The shielding cover (5) is used to reduce leakage of the magnetic field of the magnet (32) and reduce interference with other external devices.

3. The turbine flowmeter with impeller cleaning function according to claim 2, characterized in that: The driving member is fixedly connected to the shielding cover (5); a transmission assembly (6) is provided between the driving member and the rotating bracket (31); the transmission assembly (6) comprises a driving gear (61) and a gear ring (62); the transmission assembly (6) is located in the shielding cover (5); the output shaft of the driving member passes through the outer shell of the shielding cover (5) and is fixedly connected to the driving gear (61); the gear ring (62) is fixedly connected to the rotating bracket (31); and the gear ring (62) is meshed with the driving gear (61).

4. The turbine flowmeter with impeller cleaning function according to claim 1, characterized in that: A rotating assembly (7) is provided between the rotating bracket (31) and the flow tube (1). The rotating assembly (7) comprises an outer ring (71) and an inner ring (72). The inner ring (72) is sleeved on the outside of the flow tube (1) and fixedly connected to the flow tube (1). The outer ring (71) is sleeved on the outside of the inner ring (72). The outer ring (71) and the inner ring (72) are provided correspondingly. The outer ring (71) is fixedly connected to the rotating bracket (31).

5. The turbine flowmeter with impeller cleaning function according to claim 4, characterized in that: A friction reducing assembly (8) is provided between the inner ring (72) and the outer ring (71). The friction reducing assembly (8) includes a friction reducing groove (81) and friction reducing balls (82). The friction reducing groove (81) is provided on one side opposite to the inner ring (72) and the outer ring (71). The friction reducing balls (82) are located in the friction reducing groove (81). The friction reducing balls (82) are used to reduce the friction between the inner ring (72) and the outer ring (71).

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