Metallic flight flowmeter

Abstract

The present application relates to flow meter technical field, especially a kind of metal scraper flow meter.The metal scraper flow meter of the present application includes shell, inner shell, rotating drum assembly, measuring meter head and height adjusting mechanism, the upper part of shell is open and equipped with cover plate, inner shell is fixed in shell, and its both sides are respectively equipped with inlet and outlet, the upper and lower ends of shell are respectively sealed and installed with upper cover assembly and lower cover assembly, rotating drum assembly is arranged in inner shell, the middle part of rotating drum assembly is equipped with main shaft, the upper and lower ends of main shaft are respectively connected and fixed with upper cover assembly and lower cover assembly, measuring meter head is equipped on the upper end of cover plate, with drive shaft that enters into the inside of shell, rotating drum assembly is connected with drive shaft through transmission assembly, the upper and lower ends of rotating drum assembly have excess clearance between upper cover assembly and lower cover assembly, height adjusting mechanism is assembled on the upper end of main shaft, and is connected with rotating drum assembly.Advantages: the height of rotating drum assembly is conveniently adjusted, and the smooth and smooth of rotating drum rotation is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of flow meter technology, and in particular to a metal scraper flow meter. Background Technology

[0002] Currently, the scraper flow meters used in domestic crude oil pipelines are mainly imported, and their service life is relatively long. A large number of scraper flow meters have reached the end of their service life and need to be replaced. Imported flow meters have problems such as long procurement cycles, untimely maintenance, and high maintenance costs. Furthermore, the long-term reliance on imported scraper flow meters for metering makes them susceptible to international environmental influences, which can severely paralyze the metering system and affect production operations. Therefore, the development of scraper flow meters is becoming increasingly urgent. When liquid flows into the flow meter from the inlet, the pressure difference between the inlet and outlet drives the scraper to rotate. The scraper blade assembly is guided by the outer contour of the cam fixed in the middle, alternately forming a metering chamber with the inner shell and the rotating drum. Each rotation of the drum discharges an even number of times the volume of the metering chamber. Since the volume of the metering chamber is constant, the amount of liquid passing through the flow meter can be calculated by recording the number of rotations of the drum.

[0003] The published invention patent with patent number CN201110078994.5 discloses a scraper flow meter, including a cavity composed of an inner shell and an inner upper cover. A cylindrical rotor (equivalent to the rotating drum of this invention) is mounted on the main shaft at the center of the cavity via a rotor bearing. In actual use, there is a certain gap between the upper part of the rotor and the inner upper cover, and there is also a certain gap between the lower ends and the rotor cover. This is to ensure that the upper and lower ends of the rotor can rotate, but also to prevent or stop the leakage of a large amount of flow, so as to ensure the accuracy of the measurement. However, as the flow meter is used for a long time, the rotor will fall, which will increase the wear between the lower end of the rotor and the lower cover of the rotor, and cause great vibration and noise. At the same time, there will be a large amount of leakage at the upper end, resulting in low measurement accuracy of the flow meter. Moreover, when maintaining and adjusting the height of the rotor between the inner upper cover and the rotor cover, a lot of disassembly work is required, which makes maintenance very troublesome and difficult, seriously affecting the measurement efficiency and work progress of enterprises. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a metal scraper flow meter that effectively overcomes the defects of the prior art.

[0005] The technical solution of the present invention to solve the above-mentioned technical problems is as follows:

[0006] A metal scraper flow meter includes a housing, an inner housing, a rotating drum assembly, a measuring head, and a height adjustment mechanism. The housing has an open upper part fitted with a cover plate. An inlet and an outlet are respectively located on both sides of the housing. The inner housing is a cylindrical component vertically fixed within the housing, with an inlet and an outlet on both sides corresponding to the inlet and outlet. An upper cover assembly and a lower cover assembly are respectively sealed and installed at the upper and lower ends of the housing. The rotating drum assembly is disposed within the inner housing, with its upper and lower ends close to or in contact with the upper and lower cover assemblies, respectively. A rotatable section is located in the middle of the rotating drum assembly. The main shaft is connected and fixed to the upper and lower cover assemblies, respectively. The measuring head is mounted on the upper end of the cover plate and has a drive shaft extending into the upper part of the outer casing. The rotating drum assembly is connected to the drive shaft through a transmission assembly to synchronously drive the drive shaft to rotate during the rotation of the rotating drum assembly. There is a clearance between the upper and lower ends of the rotating drum assembly and the upper and lower cover assemblies. The height adjustment mechanism is mounted on the upper end of the main shaft and connected to the rotating drum assembly to drive the rotating drum assembly to move up and down to adjust the clearance.

[0007] Based on the above technical solution, the present invention can be further improved as follows.

[0008] Furthermore, the aforementioned rotating drum assembly includes a rotating drum, an inner core, a cam, and a scraper assembly. A fan-shaped liner is fixedly provided on the inner side of the rotating drum at the location between the inlet and outlet. The rotating drum includes an even number of sidewall plates with fan-shaped cross-sections, with at least four such sidewall plates. These sidewall plates are evenly distributed circumferentially and coaxially distributed with the inner shell. The inner core is located at the upper inner end of the rotating drum and is connected and fixed to the inner side of each sidewall plate via multiple connecting components. A lower cover is installed at the lower end of the rotating drum. The upper end of the lower cover assembly has a groove for accommodating the lower cover. The lower cover is connected and fixed to the lower inner end of each sidewall plate. Both the inner core and the lower cover have mounting holes that penetrate vertically. First bearings are installed in these mounting holes. The upper and lower ends of the main shaft coaxially pass through the inner rings of two first bearings and are connected and fixed to each other. A strip-shaped groove is formed between adjacent sidewall plates. The number of scraper assemblies is half the number of sidewall plates. Multiple sets of scraper assemblies are distributed circumferentially along the rotating drum. Each set of scraper assemblies includes two vertically arranged scraper blades. The two scraper blades are connected and fixed by a connecting frame. The connecting frame has a through hole extending vertically through it. The main shaft passes through the through hole and can move horizontally relative to the through hole. The scraper blades of the multiple sets of scraper assemblies extend into multiple slots one by one and are sealed to the slots. They can move radially along the rotating drum relative to the slots. The upper end of the connecting frame is equipped with scraper bearings distributed on both sides of the main shaft. The cam is fixedly mounted on the main shaft. The scraper bearings are close to or in contact with the outer edge of the cam. Two scraper blades in the same set are distributed on the same diameter line of the rotating drum. The lower end of the upper cover assembly and the upper end of the lower cover assembly are respectively provided with annular sealing surfaces. The upper and lower ends of each sidewall plate are respectively provided with the above-mentioned allowance gap between the sealing surfaces of the corresponding ends.

[0009] Furthermore, the height adjustment mechanism includes an adjusting block, a connecting rod, an adjusting nut, and a bushing. The upper end of the main shaft has a shaft hole extending downward along its axial direction. The side wall of the main shaft has limiting slots on both sides extending radially and communicating with the lower end of the shaft hole. The adjusting block is installed in the shaft hole, and its outer surface has a limiting part that corresponds to the limiting slot. The limiting part extends into the corresponding limiting slot. The bushing is sleeved on the upper end of the main shaft, and its upper end abuts against the lower end of the inner ring of the first bearing. The bushing is connected to the limiting part through a connecting piece. The lower end of the connecting rod extends into the shaft hole and is connected to the upper end of the adjusting block. The outer circumference of the connecting rod is threaded. The adjusting nut is screwed onto the connecting rod and abuts against the upper end of the main shaft.

[0010] Furthermore, threaded pins are threaded on both sides of the aforementioned adjusting block, and threaded holes corresponding to the aforementioned pins are provided on both sides of the lower end of the aforementioned connecting rod. The aforementioned pins are screwed into the corresponding threaded holes. Positioning holes corresponding to the aforementioned pins are provided on both sides of the lower end of the aforementioned bushing, and the end of the aforementioned pin away from the aforementioned connecting rod extends into the corresponding positioning hole.

[0011] Furthermore, rolling shafts corresponding to the scrapers are installed at intervals around the lower cover of the rotating drum. Each of the rolling shafts is rotatably equipped with a friction-reducing component, which makes rolling contact with the lower end of the corresponding scraper.

[0012] Furthermore, the lower end of the aforementioned scraper is provided with a wear-resistant alloy strip, the lower end of which is straight and rolls in contact with the upper end of the aforementioned wear-reducing component.

[0013] Furthermore, the upper end of the inner core is provided with a bushing cover, and the upper end of the main shaft is coaxially fitted with a thrust bearing. The thrust bearing is located in the assembly hole of the inner core and is disposed at the upper end of the scraper bearing. The bushing cover is fixed to the upper end of the inner core and presses against the upper end of the thrust bearing. The main shaft passes through the middle of the bushing cover.

[0014] Furthermore, the aforementioned transmission assembly includes a first gear, a second gear, a third gear, a fourth gear, and a driven shaft. The first gear is coaxially sleeved on the upper end of the main shaft and fixed to the upper end of the bushing cover. The driven shaft vertically passes through the upper cover assembly and is rotatably connected to it. The second gear is coaxially connected to the lower end of the driven shaft and meshes with the first gear. The third gear is coaxially assembled on the upper end of the driven shaft. The fourth gear is coaxially assembled on the lower end of the transmission shaft and meshes with the third gear.

[0015] Furthermore, the aforementioned measuring head includes a mechanical measuring head and an electronic measuring head. The mechanical measuring head is provided with the aforementioned drive shaft and a pulse transmitter, which is electrically connected to the aforementioned electronic measuring head.

[0016] Furthermore, a pressure-stabilizing cavity is formed between the upper and lower ends and side walls of the outer shell and the inner shell. An oil drain pipe communicating with the pressure-stabilizing cavity is provided at the lower end of the side wall of the outer shell, and an oil drain valve is provided on the oil drain pipe.

[0017] The beneficial effects of this invention are: it facilitates the adjustment of the height of the rotating drum assembly, so that the upper and lower ends of the rotating drum assembly have a suitable gap, thereby ensuring the smooth and stable rotation of the rotating drum, and reducing the wear and noise at the upper and lower ends of the rotating drum assembly, thus improving the performance of the flow meter. Attached Figure Description

[0018] Figure 1This is a front view schematic diagram of the metal scraper flow meter of the present invention;

[0019] Figure 2 This is a full-section front view schematic diagram of the metal scraper flow meter of the present invention;

[0020] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0021] Figure 4 for Figure 2 Enlarged view of point B in the middle;

[0022] Figure 5 for Figure 2 Enlarged view of point C in the middle;

[0023] Figure 6 This is a top-view schematic diagram of the metal scraper flow meter of the present invention;

[0024] Figure 7 This is a top view of the cam in the metal scraper flowmeter of the present invention;

[0025] Figure 8 This is a cross-sectional front view of the rotating cylinder in the metal scraper flowmeter of the present invention;

[0026] Figure 9 This is a bottom view of the rotating cylinder in the metal scraper flowmeter of the present invention;

[0027] Figure 10 This is a front view schematic diagram of the scraper assembly in the metal scraper flowmeter of the present invention;

[0028] Figure 11 This is a top view of the scraper assembly in the metal scraper flowmeter of the present invention.

[0029] The attached diagram lists the components represented by each number as follows:

[0030] 1. Outer shell; 2. Inner shell; 3. Rotary drum assembly; 5. Main shaft; 11. Liquid inlet; 12. Liquid outlet; 13. Upper cover assembly; 14. Lower cover assembly; 16. Oil drain pipe; 17. Oil drain valve; 31. Rotary drum; 32. Inner core; 33. Cam; 34. Scraper assembly; 35. Liner; 36. Shaft sleeve cover; 37. Thrust bearing; 38. Lower cover of rotary drum; 39. Drive shaft; 41. Adjusting block; 42. Connecting rod; 43. Adjusting nut; 44. Shaft sleeve; 51. Shaft hole; 52. Limiting groove hole 61. Mechanical meter head; 62. Electronic meter head; 63. Pulse transmitter; 71. First gear; 72. Second gear; 74. Third gear; 75. Fourth gear; 76. Driven shaft; 311. Side wall plate; 321. First bearing; 341. Scraper blade; 342. Connecting frame; 343. Scraper bearing; 351. Wear-reducing component; 411. Pin shaft; 3111. Connecting part; 3112. Longitudinal reinforcing rib; 3113. Transverse reinforcing rib; 3411. Wear-resistant alloy strip; 3421. Through hole. Detailed Implementation

[0031] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0032] Example: Figure 1 , 2 As shown in Figure 6, the metal scraper flowmeter of this embodiment is characterized by comprising: an outer shell 1, an inner shell 2, a rotating drum assembly 3, a measuring head, and a height adjustment mechanism. The upper part of the outer shell 1 is open and fitted with a cover plate. An inlet 11 and an outlet 12 are respectively provided on both sides of the outer shell 1. The inner shell 2 is a cylindrical component and is vertically fixed within the outer shell 1. An inlet and an outlet corresponding to and communicating with the inlet 11 and outlet 12 are respectively provided on both sides of the inner shell 1. An upper cover assembly 13 and a lower cover assembly 14 are respectively sealed and installed at the upper and lower ends of the outer shell 1. The rotating drum assembly 3 is disposed within the inner shell 2, with its upper and lower ends close to or in contact with the upper cover assembly 13 and the lower cover assembly 14, respectively. The middle part of the rotating drum assembly 3... A main shaft 5 is provided that can rotate relative to it. The upper and lower ends of the main shaft 5 are respectively connected and fixed to the upper cover assembly 13 and the lower cover assembly 14. The measuring head is mounted on the upper end of the cover plate. The measuring head has a drive shaft 39 that extends into the upper end of the outer casing 1. The rotating drum assembly 3 is connected to the drive shaft 39 through a drive assembly to synchronously drive the drive shaft 39 to rotate during the rotation of the rotating drum assembly 3. There is a clearance between the upper and lower ends of the rotating drum assembly 3 and the upper cover assembly 13 and the lower cover assembly 14. The height adjustment mechanism is mounted on the upper end of the main shaft 5 and connected to the rotating drum assembly 3 to drive the rotating drum assembly 3 to move up and down to adjust the clearance.

[0033] In this embodiment, the upper cover plate of the outer shell 1 is generally connected to the outer shell by bolts.

[0034] During use, liquid enters through inlet 11, flows between inner shell 2 and rotating drum assembly 3, and impacts rotating drum assembly 3 relative to inner shell 2. Inlet 11 and outlet 12 are both connected to the internal cavity of inner shell 2 and rotating drum assembly 3 to realize fluid supply and discharge. The volume of fluid passing through is detected during the liquid flow. The clearance between rotating drum assembly 3 and upper cover assembly 13 and lower cover assembly 14 can be adjusted by height adjustment mechanism. This ensures that rotating drum assembly 3 can rotate stably and smoothly during operation, while reducing wear, vibration and noise at the upper and lower ends of rotating drum assembly 3. It also reduces the clearance at the upper and lower ends of rotating drum assembly 3 to prevent leakage of the measured fluid, or even ensures that the clearance at the upper and lower ends of rotating drum assembly 3 will not cause leakage of the measured fluid, thereby improving the measurement accuracy of metal scraper flow meter.

[0035] As a preferred implementation method, such as Figure 2 , 8As shown in Figures 10 and 11, the aforementioned rotating drum assembly 3 includes a rotating drum 31, an inner core 32, a cam 33, and a scraper assembly 34. A fan-shaped liner 35 is fixedly provided on the inner side of the rotating drum 31 at the location between the liquid inlet 11 and the liquid outlet 12. The rotating drum 31 includes an even number of side wall plates 311 with fan-shaped cross-sections, and there are at least four side wall plates 311. These side wall plates 311 are evenly distributed circumferentially and coaxially with the inner shell 2. The inner core 32 is located at the upper inner end of the rotating drum 31 and is connected to the inner shell 2 via multiple connecting components. The inner side of each of the aforementioned sidewall plates 311 is fixedly connected. A lower cover 38 is mounted on the lower end of the aforementioned rotating cylinder 31. The upper end of the aforementioned lower cover assembly 14 is provided with a groove for accommodating the aforementioned lower cover 38. The lower cover 38 is fixedly connected to the inner lower end of each of the aforementioned sidewall plates 311. Both the inner core 32 and the aforementioned lower cover 38 have mounting holes that penetrate vertically through them. First bearings 321 are respectively installed in the mounting holes. The upper and lower ends of the aforementioned main shaft 5 coaxially pass through the inner rings of the two aforementioned first bearings 321 and are connected and fixed to each other. Adjacent two of the aforementioned sidewall plates 311... Each wall panel 311 has a strip-shaped slot. The number of scraper assemblies 34 is half the number of side wall panels 311. Multiple sets of scraper assemblies 34 are distributed circumferentially along the rotating drum 31. Each set of scraper assemblies 34 includes two vertically arranged scraper blades 341. The two scraper blades 341 are connected and fixed by a connecting frame 342. The connecting frame 342 has a through hole 3421 that extends vertically through it. The main shaft 5 passes through the through hole 3421 and can move horizontally relative to the through hole 3421. The scraper blades 341 of the multiple sets of scraper assemblies 34 Each of the aforementioned components extends into a corresponding slot and is sealed to the slot. It can move radially relative to the slot along the rotating drum 31. The upper end of the connecting frame 342 is equipped with scraper bearings 343 distributed on both sides of the main shaft 5. The cam 33 is fixedly mounted on the main shaft 5. The scraper bearings 343 are all close to or in contact with the outer edge of the cam 33. Two scraper blades 341 in the same group are distributed along the same diameter line of the rotating drum 31. The lower end of the upper cover assembly 13 and the upper end of the lower cover assembly 14 are respectively provided with annular sealing surfaces (e.g., ...). Figure 3 , 4 As shown (referred to as m), the upper and lower ends of each of the above-mentioned side wall plates 311 are respectively provided with the above-mentioned allowance gap between the sealing surface of the corresponding end, and a fluid channel is formed between the rotating cylinder 31 and the inner shell 2.

[0036] In the above implementation plan, such as Figure 7As shown, the cam 33 is roughly designed in a fan shape. The cam 33 includes a contraction holding section 33a, an extension section 33b, an extension holding section 33c, and a contraction section 33d. The contraction holding section 33a is located on the side closer to the inner liner 35, the extension holding section 33c is located on the side away from the inner liner 35, the extension section 33b is located on the side closer to the liquid inlet 11, and the contraction section 33d is located on the side closer to the liquid outlet 12. The contraction holding section 33a, the extension section 33b, the extension holding section 33c, and the contraction section 33d are smoothly connected to each other, thus forming the outer contour of the cam 33. The rotating cylinder 31 is integrally injection molded during manufacturing. Then, slots are opened on the side wall of the rotating cylinder 31 to form multiple mutually separated side wall plates 311.During operation, the main shaft 5 and its cam 33 are fixed relative to the outer casing 1. The kinetic energy of the fluid injected into the fluid channel acts on the scraper 341 located at the extension section 33b and the extension holding section 33c. The scraper 341 drives the rotating drum 31 to rotate within the inner casing 2. The scraper bearing 343 is used to contact the cam 33. In other words, the outer ring of the scraper bearing 343 is in contact with the cam 33 to reduce the friction between the cam 33 and the scraper 341, thereby reducing the wear caused by the contact between the scraper 341 and the cam 33, and ensuring the smooth operation of the scraper 341. The fixed extension length maintains the gap between the scraper 341 and the inner wall of the inner shell 2, preventing an increase in leakage flow and thus maintaining the accuracy of fluid volume measurement. Simultaneously, the scraper bearing 343 on the scraper 341, located in the contraction holding section 33a, gradually moves to the extension section 33b. Under the pushing force of the inclined surface of the extension section 33b, the scraper 341 is pushed towards the inner shell 2. When the scraper 341 is located in the extension holding section 33c of the cam 33, at least two scrapers 341 on the extension holding section 33c extend to their limit positions, forming a metering cavity between these two scrapers 341. After the scraper 341 moves to the contraction section 33d of the cam 33, the scraper 341 retracts between the inner core 32 and the side wall plate 311 of the rotating drum 31, opening the metering chamber and discharging the liquid inside. Each rotation of the rotating drum 31 discharges a set multiple of the metering chamber's volume. Since the metering chamber's volume is constant, recording the number of rotations of the rotating drum 31 allows calculation of the amount of liquid passing through the flow meter. When two scrapers 341 on the same scraper assembly 34 are linked, as the scraper 341 gradually moves from the extension section 33b to the extension holding section 33c, the scraper... With the support of the plate bearing 343, the scraper 341 at this section gradually extends outward. Under the pull of the connecting frame 342, the scraper 341 on the opposite side is in the transition position from the extension holding section 33c to the contraction section 33d. As the scraper 341 at the extension section 33b gradually extends outward, the scraper 341 on the opposite side gradually contracts inward. The extended scraper 341 forms a metering chamber for holding a fixed volume of fluid, and the contracted scraper 341 opens the metering chamber to release the metered fluid and realize the outward discharge of fluid. This cycle is repeated to achieve continuous metering of fluid volume.

[0037] It should be further explained that the inner liner 35 is designed to enable unidirectional flow of fluid within the fluid channel. One side of the inner liner 35 contacts the inner wall of the inner shell 2, and the other side of the inner liner 35 contacts the outer wall of the rotating cylinder 3, thereby blocking the fluid channel between the inlet 11 and the outlet 12. This allows the fluid entering the fluid channel through the inlet 11 to be guided by the fluid channel and then discharged through the outlet 12, thus enabling the fluid to flow in a guided manner within the fluid channel and facilitating subsequent volume detection.

[0038] In this embodiment, to reduce the minimum distance between the scraper blade 341 and the inner wall of the inner shell 2, and thus reduce the discharge gap and the discharge flow rate to improve measurement accuracy, unlike the prior art, the minimum distance between the end of the scraper blade 341 away from the cam 33 and the inner shell 2 is not less than the minimum distance between the scraper bearing 343 and the cam 33. Preferably, the distance between the end of the scraper blade 341 away from the cam 33 and the inner shell 2 is 0.3mm-0.5mm. This ensures a smaller gap between the scraper blade 341 and the inner wall of the inner shell 2, reducing the volume of fluid discharged through this gap when fluid passes through, thereby increasing the scraper flow rate. The accuracy of the measurement is ensured; the distance between the scraper bearing 343 and the cam 33 is 0.1mm to 0.3mm, which is used to ensure that the cam 33 can push the scraper 341 to its maximum length towards the inner shell 2, thereby ensuring that the minimum distance between the end of the scraper 341 away from the cam 33 and the inner shell 2 is not less than 0.3mm, so as to prevent the end of the scraper 341 away from the cam 33 from colliding with the inner wall of the inner shell 2, and reduce the amount of movement of the scraper 341 due to the gap between the scraper bearing 343 and the cam 33, thereby better maintaining the distance between the end of the scraper 341 away from the cam 33 and the inner wall of the inner shell 2 within a controllable range.

[0039] It should be further explained that: In this embodiment, the two ends of the connecting frame 342 are fixedly connected to, hinged to, or integrally set with the corresponding scraper 341, so that the scrapers 341 at both ends of the connecting frame 342 can be linked under the action of the outer contour of the cam 33; In the prior art, four scrapers 341 are usually used, that is, four scrapers 341 are used to divide the fluid channel into four metering chamber volumes, while in this embodiment, six scrapers 341 are used. In this way, the scraper assembly 34 divides the fluid channel between the inner shell 2 and the rotating drum 31 into six metering chamber volumes. The volume of a single metering chamber is reduced, which reduces the pulsating flow during operation and reduces the probability of the flow meter exceeding the tolerance.

[0040] As a preferred implementation method, such as Figure 2 , 5As shown, the height adjustment mechanism includes an adjusting block 41, a connecting rod 42, an adjusting nut 43, and a bushing 44. The upper end of the main shaft 5 is provided with a shaft hole 51 along its axial direction downward. The side wall of the main shaft 5 is provided with limiting slots 52 on both sides along its radial direction, which are connected to the lower end of the shaft hole 51. The adjusting block 41 is installed in the shaft hole 51, and its outer surface is provided with limiting parts corresponding to the limiting slots 52. The limiting parts extend into the corresponding limiting slots 52. The bushing 44 is sleeved on the upper end of the main shaft 5, and its upper end abuts against the lower end of the inner ring of the first bearing 321. The bushing 44 is connected to the limiting parts through a connector. The lower end of the connecting rod 42 extends into the shaft hole 51 and is connected to the upper end of the adjusting block 41. The outer circumference of the connecting rod 42 is provided with threads. The adjusting nut 43 is screwed onto the connecting rod 42 and abuts against the upper end of the main shaft 5.

[0041] In the above implementation scheme, during assembly, the adjusting block 41 is located inside the shaft hole 51, the limiting part of the adjusting block 41 extends out through the limiting slot 52 and rests on the lower end of the bushing 44, and the lower end of the connecting rod 42 is connected to the upper end of the adjusting block 41. It should be particularly emphasized that the height of the limiting slot 52 is greater than the height of the adjusting block 41, so that the adjusting block 41 has sufficient room for movement, the overall structure is more compact, and the adjustment accuracy is higher.

[0042] In this embodiment, threaded pins 411 are threaded on both sides of the adjusting block 41 and are arranged laterally. The lower end of the connecting rod 42 is provided with threaded holes corresponding to the pins 411. The pins 411 are screwed into the corresponding threaded holes. The lower end of the bushing 44 is provided with positioning holes corresponding to the pins 411. The end of the pin 411 away from the connecting rod 42 extends into the corresponding positioning hole to ensure that the bushing 44 cannot rotate relative to the adjusting block 41 and can only move up and down under the traction of the connecting rod 42. This avoids the bushing 44 having unnecessary degrees of freedom and increases the stability of the bushing 44 assembly.

[0043] In a preferred embodiment, rolling shafts corresponding to the scrapers 341 are installed at intervals around the lower cover 38 of the rotating drum. Each of the rolling shafts is rotatably equipped with a wear-reducing component 351, which makes rolling contact with the lower end of the corresponding scraper 341.

[0044] In the above embodiment, the sealing surface of the lower cover assembly 14 supports the lower end 1 of the scraper 341. A rolling shaft is provided on the outer edge of the rotating drum lower cover 38. A friction-reducing component 351 is rotatably mounted on the rolling shaft. The friction-reducing component 351 is located in the upper groove of the lower cover assembly 14 and is also located directly below the scraper 341 and in contact with the lower end of the scraper 341. When the scraper 341 moves telescopically, the friction-reducing component 351 plays a supporting and friction-reducing role directly below the scraper 341 to reduce the wear of the lower end of the scraper 341, thereby improving the service life of the scraper 341 and reducing the mechanical noise of the scraper flow meter during the circular process.

[0045] It should be noted that the anti-friction component 351 includes, but is not limited to, rolling structures such as rollers and bearings. In the prior art, the anti-friction component 351 uses a bearing with a hardness greater than that of the bottom of the scraper 341. The bearing also has clearance, which leads to slight vibration of the scraper 341 during the operation of the scraper flowmeter. The lower end face of the scraper 341 is the first to wear and fail, which not only increases mechanical noise but also seriously affects the service life of the scraper 341. During maintenance, the scraper 341 can only be replaced, resulting in high maintenance costs. Therefore, a wear-resistant alloy strip 341 (such as...) is provided at the lower end of the scraper 341. Figure 2 , 4 As shown, the lower end of the wear-resistant alloy strip 3411 is straight and rolls in contact with the upper end of the wear-reducing component 351. The wear-resistant alloy strip 3411 is made of K30 hard alloy material with a strip structure and a hardness HRA of not less than 89.3. The wear-reducing component 351 adopts a roller structure made of Cr12MoV steel with a hardness of HRC50 to 55, which is used to replace ordinary bearings, so that the wear-reducing component 351 no longer has the clearance of bearings, and the extension and retraction movement of the scraper 341 can be more stable. After heat treatment, the hardness of the roller is close to that of the wear-resistant alloy strip 3411, which improves the wear resistance and extends the life of the flow meter. If damage occurs, it is the roller that is worn. The maintenance difficulty and maintenance cost of replacing the roller are far lower than the maintenance difficulty and maintenance cost of replacing the scraper 341.

[0046] It should be further explained that the scraper 341 in this invention is made of aluminum alloy sheet. Since the finished aluminum alloy sheet does not have the defects such as porosity, shrinkage cavity, sand inclusion, and cracks of castings, and is easy to purchase and process, it is convenient for mass production. At the same time, it also ensures that the scraper 341 has better strength and mechanical properties, thereby improving its service life and resulting in better economic benefits for the scraper 341.

[0047] In this embodiment, a bushing cover 36 is provided at the upper end of the inner core 32, and a thrust bearing 37 is coaxially mounted on the upper end of the main shaft 5. The thrust bearing 37 is located in the mounting hole of the inner core 32 and is disposed at the upper end of the scraper bearing 343. The bushing cover 36 is fixed to the upper end of the inner core 32 and presses against the upper end of the thrust bearing 37. The main shaft 5 passes through the middle of the bushing cover 36. The bushing cover 36 is used to press the thrust bearing 37, so that the scraper bearing 343 is securely installed.

[0048] As a preferred implementation method, such as Figure 2 , 5 As shown, the transmission assembly includes a first gear 71, a second gear 72, a third gear 74, a fourth gear 75, and a driven shaft 76. The first gear 71 is coaxially sleeved on the upper end of the main shaft 5 and fixed to the upper end of the bushing cover 36. The driven shaft 76 vertically passes through the upper cover assembly 13 and is rotatably connected to each other. The second gear 72 is coaxially connected to the lower end of the driven shaft 76 and meshes with the first gear 71. The third gear 74 is coaxially mounted on the upper end of the driven shaft 76. The fourth gear 75 is coaxially mounted on the lower end of the transmission shaft 39 and meshes with the third gear 74.

[0049] In the above implementation scheme, during operation, the kinetic energy of the fluid in the fluid channel drives the rotating drum 31 to rotate via the scraper 341. The rotating drum 31 drives the bushing cover 36 to rotate via the wing plate 33, which in turn drives the first gear 71 to rotate. The number of rotations of the rotating drum 31 is transmitted to the measuring head in sequence via the second gear 72, the third gear 74, and the fourth gear 75. The actual flow parameters are judged based on the data feedback from the measuring head.

[0050] In this embodiment, as Figure 1 As shown, the aforementioned measuring head includes a mechanical measuring head 61 and an electronic measuring head 62. The mechanical measuring head 61 contains the aforementioned drive shaft 39 and a pulse transmitter 63, which is electrically connected to the electronic measuring head 62. The mechanical measuring head 61 drives the pulse transmitter 63 to emit pulse signals. The electronic measuring head 62 receives the pulse signals from the pulse transmitter 63 and displays the data. Operators combine the data from the mechanical measuring head 61 with the data from the electronic measuring head 62 to comprehensively determine the actual flow parameters, making the data more reliable.

[0051] In a preferred embodiment, a pressure stabilizing cavity is formed between the upper and lower ends and side walls of the outer shell 1 and the inner shell 2. The lower end of the side wall of the outer shell 1 is provided with an oil drain pipe 16 that communicates with the pressure stabilizing cavity, and an oil drain valve 17 is provided on the oil drain pipe 16.

[0052] In the above implementation scheme, the outer shell 1 and the inner shell 2 form a double shell structure, which can eliminate the deformation of the fluid channel caused by external forces such as pressure difference and pipeline tension, thereby causing inaccurate measurement. The seal between the double shell structures is achieved by a circular sealing ring. An oil drain pipe 16 is connected to the bottom of the outer shell 1, and an oil drain valve 17 is installed at the end of the oil drain pipe 16. The oil drain pipe 16 can stabilize the internal pressure of the flow meter to ensure that the fluid channel does not deform.

[0053] More specifically, the outer shell 1 is a cylindrical shell coaxially arranged with the inner shell 2. The outer wall of the inner shell 2 is in contact with the inner wall of the outer shell 1. The outer wall of the inner shell 2 is sealed to the inner wall of the outer shell 1 around the inlet and outlet by a sealing ring. The inner wall of the outer shell 1 is provided with a recessed area, which connects the upper cavity of the upper cover assembly 13 and the lower cavity of the lower cover assembly 14 to form the pressure stabilizing cavity.

[0054] To facilitate the installation of the lower cover 38 of the rotating drum, a horizontal connecting part 3111 is integrally formed at the lower end of each of the aforementioned side wall panels 311. The lower cover 38 of the rotating drum is fitted to the lower ends of the multiple connecting parts 3111 and is connected and fixed to each other. The lower cover 38 of the rotating drum and the connecting parts 311 are connected and fixed to each other by bolts that are spaced apart.

[0055] In this embodiment, the lower cover 38 of the rotating drum is a circular cover plate, which is coaxially distributed with the main shaft 5.

[0056] In a preferred embodiment, the inner side of the aforementioned sidewall panel is provided with longitudinal reinforcing ribs 3112 and transverse reinforcing ribs 3113 at intervals along its axial and radial directions, respectively.

[0057] In the above implementation plan, such as Figure 8 and 9 As shown, longitudinal reinforcing ribs 3112 and transverse reinforcing ribs 3113 are arranged alternately, with at least two transverse reinforcing ribs 3113, and are evenly distributed along the axial direction of the rotating drum 31. The longitudinal reinforcing ribs 3112 and transverse reinforcing ribs 3113 greatly increase the strength of the side wall plate 311 of the rotating drum 31. Specifically, during use, especially when the rotating drum 31 is obstructed due to the entry of debris, the strong impact of the fluid acts on the scraper 341, resulting in a large pressure exerted by the scraper 341 on the side wall of the groove. Without the transverse reinforcing ribs 3113, the side wall of the groove is easily damaged, causing the entire rotating drum 31 to be scrapped, and the cost of repair and replacement is very high. However, after setting the transverse reinforcing ribs 3113, the strength of the side wall of the groove can be effectively increased, especially when the longitudinal reinforcing ribs 3112 and transverse reinforcing ribs 3113 act on the side wall plate 311 simultaneously, the effect is even more obvious.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A metal scraper flow meter, characterized in that: The device includes an outer shell (1), an inner shell (2), a rotating drum assembly (3), a measuring head, and a height adjustment mechanism. The upper part of the outer shell (1) is open and fitted with a cover plate. The outer shell (1) has an inlet (11) and an outlet (12) on its two sides, respectively. The inner shell (2) is a cylindrical component and is vertically fixed in the outer shell (1). Its two sides are respectively provided with an inlet and an outlet that are connected to the inlet (11) and the outlet (12). The upper and lower ends of the outer shell (1) are respectively sealed with an upper cover assembly (13) and a lower cover assembly (14). The rotating drum assembly (3) is located in the inner shell (2), and its upper and lower ends are close to or in contact with the upper cover assembly (13) and the lower cover assembly (14), respectively. The middle part of the rotating drum assembly (3) is provided with a rotatable part. The main shaft (5) is connected and fixed to the upper cover assembly (13) and the lower cover assembly (14) respectively. The measuring head is mounted on the upper end of the cover plate. The measuring head has a transmission shaft (39) that extends into the upper end of the outer shell (1). The rotating drum assembly (3) is connected to the transmission shaft (39) through a transmission assembly to synchronously drive the transmission shaft (39) to rotate during the rotation of the rotating drum assembly (3). There is a clearance between the upper and lower ends of the rotating drum assembly (3) and the upper cover assembly (13) and the lower cover assembly (14). The height adjustment mechanism is mounted on the upper end of the main shaft (5) and connected to the rotating drum assembly (3) to drive the rotating drum assembly (3) to move up and down to adjust the clearance. The rotating drum assembly (3) includes a rotating drum (31), an inner core (32), a cam (33), and a scraper assembly (34). The inner side of the rotating drum (31) is fixedly provided with a fan-shaped liner (35) on the part between the liquid inlet (11) and the liquid outlet (12). The rotating drum (31) includes an even number of side wall plates (311) with fan-shaped cross-sections, and there are at least four side wall plates (311). The multiple side wall plates (311) are evenly distributed circumferentially and are coaxially distributed with the inner shell (2). The inner core (32) is located at the upper end of the interior of the rotating drum (31) and is connected to each side wall plate (311) through multiple connecting parts. The inner side is fixedly connected, and the lower end of the rotating drum (31) is equipped with a rotating drum lower cover (38). The upper end of the lower cover assembly (14) is provided with a groove for accommodating the rotating drum lower cover (38). The rotating drum lower cover (38) is fixedly connected to the lower end of the inner side wall plate (311). The inner core (32) and the rotating drum lower cover (38) both have mounting holes that pass through them vertically. The mounting holes are respectively equipped with first bearings (321). The upper and lower ends of the main shaft (5) pass through the inner rings of the two first bearings (321) coaxially and are connected and fixed to each other. A strip-shaped groove is formed between two adjacent side wall plates (311). The scraper assembly The number of components (34) is half the number of the side wall plates (311). Multiple sets of scraper assemblies (34) are distributed circumferentially along the rotating drum (31). Each set of scraper assemblies (34) includes two vertically arranged scraper blades (341). The two scraper blades (341) are connected and fixed together by a connecting frame (342). The connecting frame (342) has a through hole (3421) that passes through it vertically. The main shaft (5) passes through the through hole (3421) and can move horizontally relative to the through hole (3421). The scraper blades (341) of the multiple sets of scraper assemblies (34) are respectively inserted into multiple slots and sealed with the slots. The connecting frame (342) is equipped with scraper bearings (343) distributed on both sides of the main shaft (5) at its upper end. The cam (33) is fixedly mounted on the main shaft (5). The scraper bearings (343) are close to or in contact with the outer edge of the cam (33). The two scraper blades (341) in the same group are distributed on the same diameter line of the rotating drum (31). The lower end of the upper cover assembly (13) and the upper end of the lower cover assembly (14) are respectively provided with annular sealing surfaces. The upper and lower ends of each side wall plate (311) are respectively provided with the allowance gap between the sealing surfaces of the corresponding ends. The height adjustment mechanism includes an adjusting block (41), a connecting rod (42), an adjusting nut (43), and a bushing (44). The upper end of the main shaft (5) is provided with a shaft hole (51) along its axial direction downward. The side wall of the main shaft (5) is provided with limiting slots (52) on both sides along its radial direction, which are connected to the lower end of the shaft hole (51). The adjusting block (41) is installed in the shaft hole (51), and its outer surface is provided with limiting parts that correspond one-to-one with the limiting slots (52). The limiting parts extend into the corresponding shaft holes (44). In the limiting slot (52), the bushing (44) is sleeved on the upper end of the main shaft (5), and its upper end abuts against the lower end of the inner ring of the first bearing (321). The bushing (44) is connected to the limiting part through a connector. The lower end of the connecting rod (42) extends into the shaft hole (51) and is connected to the upper end of the adjusting block (41). The outer circumference of the connecting rod (42) is threaded. The adjusting nut (43) is screwed onto the connecting rod (42) and abuts against the upper end of the main shaft (5).

2. The metal scraper flow meter according to claim 1, characterized in that: The adjusting block (41) has threaded pins (411) threaded on both sides, and the lower end of the connecting rod (42) has threaded holes on both sides corresponding to the pins (411). The pins (411) are screwed into the corresponding threaded holes. The lower end of the bushing (44) has positioning holes on both sides corresponding to the pins (411). The end of the pin (411) away from the connecting rod (42) extends into the corresponding positioning hole.

3. The metal scraper flow meter according to claim 1, characterized in that: The lower cover (38) of the rotating drum is surrounded by rolling shafts that correspond one-to-one with the scraper (341). Each rolling shaft is rotatably equipped with a wear-reducing component (351), and the wear-reducing component (351) makes rolling contact with the lower end of the corresponding scraper (341).

4. A metal scraper flow meter according to claim 3, characterized in that: The lower end of the scraper (341) is provided with a wear-resistant alloy strip (3411), the lower end of which is straight and rolls in contact with the upper end of the wear-reducing component (351).

5. A metal scraper flow meter according to claim 1, characterized in that: The upper end of the inner core (32) is provided with a bushing cover (36). The upper end of the main shaft (5) is coaxially equipped with a thrust bearing (37). The thrust bearing (37) is located in the mounting hole of the inner core (32) and is set at the upper end of the scraper bearing (343). The bushing cover (36) is fixed at the upper end of the inner core (32) and presses against the upper end of the thrust bearing (37). The main shaft (5) passes through the middle of the bushing cover (36).

6. A metal scraper flow meter according to claim 5, characterized in that: The transmission assembly includes a first gear (71), a second gear (72), a third gear (74), a fourth gear (75), and a driven shaft (76). The first gear (71) is coaxially sleeved on the upper end of the main shaft (5) and fixed to the upper end of the bushing cover (36). The driven shaft (76) vertically passes through the upper cover assembly (13) and is rotatably connected to each other. The second gear (72) is coaxially connected to the lower end of the driven shaft (76) and meshes with the first gear (71). The third gear (74) is coaxially mounted on the upper end of the driven shaft (76). The fourth gear (75) is coaxially mounted on the lower end of the transmission shaft (39) and meshes with the third gear (74).

7. A metal scraper flow meter according to claim 1, characterized in that: The measuring head includes a mechanical head (61) and an electronic head (62). The mechanical head (61) is provided with the drive shaft (39) and a pulse transmitter (63) is provided on the mechanical head (61). The pulse transmitter (63) is electrically connected to the electronic head (62).

8. A metal scraper flow meter according to claim 1, characterized in that: A pressure stabilizing cavity is formed between the upper and lower ends and side walls of the outer shell (1) and the inner shell (2). An oil drain pipe (16) communicating with the pressure stabilizing cavity is provided at the lower end of the side wall of the outer shell (1). An oil drain valve (17) is provided on the oil drain pipe (16).

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