A high-precision flowmeter

Abstract

The application relates to a high-precision flowmeter which comprises a rotor, a metering chamber, a mechanical counter and a scraper mechanism, the metering chamber is provided with a water inlet and a water outlet at two ends respectively, the rotor is rotatably connected in the metering chamber, one end of the rotor penetrates through the side wall of the metering chamber and is connected with the mechanical counter, one end of the scraper mechanism is connected with the side wall of the rotor and the other end abuts against the inner wall of the metering chamber, the scraper mechanism is multiple, and the multiple scraper mechanisms are arranged in a ring-shaped interval array around the center line of the rotor. When the high-precision flowmeter is used to measure industrial water, the length of the scraper mechanism can be adjusted, so that the situation that the scraper mechanism is stuck due to the temperature difference is reduced to a certain extent, and the normal use of the flowmeter is ensured to a certain extent.

Description

Technical Field

[0001] This invention relates to the field of fluid measurement technology, and more specifically to a high-precision flow meter. Background Technology

[0002] A flow meter is an instrument that measures the flow rate and / or the total volume of fluid within a selected time interval; that is, it is used to measure the flow rate of fluid in pipes or open channels. Flow meters are classified into differential pressure flow meters, rotor flow meters, throttling flow meters, slot flow meters, volumetric flow meters, electromagnetic flow meters, ultrasonic flow meters, etc.

[0003] In industrial production, the utilization and recycling of water resources is an important indicator, so water-saving devices and other specialized equipment are often used. Among them, volumetric flow meters are often used in water-saving equipment due to their high measurement accuracy. However, due to the different temperatures of industrial water, the water flowing through the flow meter is often too hot, causing the rotor to deform and seize due to temperature difference, thus affecting the use of the flow meter. At the same time, the accumulation of impurities in industrial water in the metering chamber can also easily cause the flow meter to seize. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a high-precision flow meter to solve the problem that in the prior art, due to the different temperatures of industrial water, the high temperature of the water flowing through the flow meter causes the rotor to deform and jam due to temperature difference, thus affecting the use of the flow meter; at the same time, the accumulation of impurities in industrial water in the metering chamber can also easily cause the flow meter to jam.

[0005] This invention is achieved through the following technical solution:

[0006] A high-precision flow meter includes a rotor, a metering chamber, a mechanical counter, and a scraper mechanism. The metering chamber has an inlet and an outlet at its two ends, respectively. The rotor is rotatably connected to the metering chamber. One end of the rotor passes through the side wall of the metering chamber and is connected to the mechanical counter. One end of the scraper mechanism is connected to the side wall of the rotor, and the other end abuts against the inner wall of the metering chamber. There are multiple scraper mechanisms, which are arranged in a ring-shaped interval array around the center line of the rotor.

[0007] The scraper mechanism includes a scraper body, an extension plate, a drive mechanism, and a reset mechanism. One end of the scraper body is connected to the rotor sidewall. One end of the extension plate is slidably connected to the scraper body in a direction toward or away from the rotor centerline, and the other end abuts against the sidewall of the metering chamber. The drive mechanism is used to drive the extension plate to slide toward the rotor centerline, and the reset mechanism is used to push the extension plate to extend and reset.

[0008] Furthermore, the driving mechanism includes a driving disk, connecting rods, connecting shafts, and a locking part. The driving disk is coaxially aligned with the rotor and is rotatably connected to the rotor. There are multiple connecting shafts arranged in a ring-shaped array around the center line of the driving disk. One end of each connecting shaft is connected to the driving disk. There are multiple connecting rods, each corresponding to a multiple scraper mechanism. Both ends of each connecting rod are hinged to multiple rotating shafts and multiple extension plates. The locking part is used to lock the rotation angle of the driving mechanism.

[0009] Furthermore, the locking part includes a ratchet, which is connected to the drive disk. The ratchet and the drive disk are coaxially aligned, and the ratchet teeth are inclined in the direction of water flow. The scraper mechanism also includes a support plate, a first spring, a second spring, and a sliding rod. The support plate is parallel to the scraper body, and its upper end abuts against the recess of the ratchet. The upper end face of the support plate is inclined downwards at one edge facing the water inlet. The first spring is perpendicular to the support plate, and its two ends are connected to the scraper body and the support plate, respectively. The second spring and the sliding rod are both arranged along the length of the scraper mechanism. The lower end of the sliding rod is slidably connected to the scraper body along the length of the first spring, and the upper end of the sliding rod is slidably connected to the support plate along the length of the support plate. The second spring is sleeved on the outer circumferential surface of the sliding rod, and its two ends are connected to the support plate and the scraper body, respectively.

[0010] Furthermore, the drive disk sidewall is recessed inward to form a first groove; the reset mechanism includes a push rod and a slide rod, the push rod is arranged along the rotor central axis, the slide rod is slidably engaged in the groove, the ratchet is slidably connected to the outer circumferential surface of the drive disk along the length of the rotor centerline, one end of the push rod passes through the vertical surface of the drive disk and the inner sidewall of the first groove to connect to one end of the slide rod, the other end of the slide rod is connected to the inner circumferential wall of the ratchet, and the other end of the push rod passes through the outer sidewall of the metering chamber; the end of the extension plate facing the rotor is recessed inward to form a guide groove, the guide rod is slidably engaged in the guide groove, the scraper body is connected to the guide rod, and also includes a third spring, the third spring is sleeved on the guide rod, and the two ends of the third spring are respectively connected to the scraper body and the extension plate.

[0011] Furthermore, the side wall of the metering chamber is recessed inward to form a second annular groove. The upper end of the annular groove is located at the upper part of the rotor, and the lower end is located at the bottom of the metering chamber. The groove also includes multiple sliders and multiple cleaning brushes. Each slider and cleaning brush corresponds to a scraper mechanism. Each slider can be slidably connected to the second groove. Each cleaning brush is arranged along the width direction of the scraper mechanism. One end of each cleaning brush is rotatably connected to a slider.

[0012] Furthermore, the lower part of the metering chamber is recessed to form an impurity tank, and a filter plate is connected to the upper end of the impurity tank. The filter plate has an opening on the side facing the water inlet.

[0013] Furthermore, it also includes a cleaning plate, a fourth spring, and a connecting rod. The filter plate is slidably connected to the impurity tank along the length of the filter plate. The upper end face of the cleaning plate abuts against the lower end face of the filter screen. The lower end of the connecting rod is connected to the cleaning plate, and the upper end of the connecting rod abuts against the lower end of the scraper mechanism. The fourth spring is arranged parallel to the length of the filter plate, and the two ends of the fourth spring are respectively connected to the connecting rod and the side wall of the impurity tank near the water inlet.

[0014] The beneficial effects of this invention are as follows:

[0015] When using a high-precision flow meter of the present invention to measure industrial water, the length of the scraper mechanism can be adjusted, thereby reducing the likelihood of the scraper mechanism jamming due to temperature differences and ensuring the normal operation of the flow meter to a certain extent.

[0016] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention;

[0018] Figure 2 This is a cross-sectional view of the structure of the present invention;

[0019] Figure 3 For the present invention Figure 2 A magnified view of part A in the image;

[0020] Figure 4 This is a schematic diagram of the scraper mechanism, drive mechanism, and reset mechanism of the present invention;

[0021] Figure 5For the present invention Figure 4 A magnified view of part B in the image;

[0022] Figure 6 For the present invention Figure 4 A magnified view of part C;

[0023] Figure 7 For the present invention Figure 4 A magnified view of part D;

[0024] Figure 8 This is a schematic diagram of the connecting rod, cleaning plate, and fourth spring of the present invention;

[0025] Figure 9 This is a diagram showing the fit between the ratchet and the abutment plate of the present invention.

[0026] In the diagram: 1. Rotor; 2. Metering chamber; 21. Inlet; 22. Outlet; 3. Mechanical counter; 4. Scraper mechanism; 41. Scraper body; 42. Extension plate; 421. Guide groove; 422. Guide rod; 423. Third spring; 43. Support plate; 44. First spring; 45. Second spring; 46. Sliding rod; 47. Third slide groove; 5. Drive mechanism; 51. Drive disc; 511. First slide groove; 52. Connecting rod; 53. Connecting shaft; 54. Locking part; 541. Ratchet; 6. Reset mechanism; 61. Push rod; 62. Sliding rod; 71. Second slide groove; 72. Cleaning brush; 73. Impurity tank; 74. Filter plate; 75. Cleaning plate; 76. Fourth spring; 77. Connecting rod. Detailed Implementation

[0027] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0028] Please see Figures 1-9 This invention provides a high-precision flow meter technical solution: including a rotor 1, a metering chamber 2, a mechanical counter 3, and a scraper mechanism 4. The metering chamber 2 has an inlet 21 and an outlet 22 at its two ends, respectively. The rotor 1 is rotatably connected to the metering chamber 2. One end of the rotor 1 passes through the side wall of the metering chamber 2 and is connected to the mechanical counter 3. One end of the scraper mechanism 4 is connected to the side wall of the rotor 1, and the other end abuts against the inner wall of the metering chamber 2. There are multiple scraper mechanisms 4, and the multiple scraper mechanisms 4 are arranged in a ring-shaped interval array around the center line of the rotor 1.

[0029] The scraper mechanism 4 includes a scraper body 41, an extension plate 42, a drive mechanism 5, and a reset mechanism 6. One end of the scraper body 41 is connected to the side wall of the rotor 1. One end of the extension plate 42 is slidably connected to the scraper body 41 in the direction of the rotor 1 centerline or away from it, and the other end abuts against the inner side wall of the metering chamber 2. The drive mechanism 5 is used to drive the extension plate 42 to slide in the direction of the rotor 1 centerline. The reset mechanism 6 is used to push the extension plate 42 to extend and reset.

[0030] The upper part of the metering chamber 2 is semi-circular and the lower part is square. The center line of the rotor 1 is located at the center of the semi-circle of the metering chamber 2. The upper and lower spaces of the metering chamber 2 are just enough to allow the scraper mechanism 4 to rotate through. The two ends of the lower part of the metering chamber 2 are respectively provided with an inlet 21 and an outlet 22.

[0031] When using a high-precision flow meter of the present invention to measure industrial water, the pipe is first connected to the inlet 21 and the outlet 22 by bolts. Then, industrial water is introduced into the metering chamber 2 through the pipe from the inlet 21. Driven by the water flow, multiple scraper mechanisms 4 start to rotate in the direction of the water flow, thereby driving the rotor 1 to rotate. The mechanical counter 3 measures the number of rotations of the rotor 1. In this way, the flow rate of industrial water is recorded.

[0032] Since one end of the extension plate 42 is slidably connected to the scraper body 41 in the direction of the rotor 1 centerline or away from it, and the other end abuts against the inner wall of the metering chamber 2, the driving mechanism 5 is used to drive the extension plate 42 to slide in the direction of the rotor 1 centerline. When the water temperature rises and the scraper mechanism 4 and the inner wall of the metering chamber 2 expand, causing the scraper mechanism 4 to jam, the extension plate 42 can be driven by the driving mechanism 5 to slide in the direction of the rotor 1 to adjust the scraper mechanism 4, so that the scraper mechanism 4 is shortened and does not abut against the inner wall of the metering chamber 2, allowing the scraper mechanism 4 to continue to rotate in the metering chamber 2. Since the reset mechanism 6 is used to push the extension plate 42 to extend and reset, the length of the extension plate 42 is reset and calibrated by the reset mechanism 6, so that the scraper mechanism 4 can be lengthened and reset after the water temperature drops, which is convenient for the next use.

[0033] With this structure, when using a high-precision flow meter of the present invention to measure industrial water, the length of the scraper mechanism 4 can be adjusted, thereby reducing the possibility of the scraper mechanism 4 getting stuck when affected by temperature difference, and ensuring the normal use of the flow meter to a certain extent.

[0034] In this embodiment: the driving mechanism 5 includes a driving disk 51, connecting rods 52, connecting shafts 53, and locking part 54. The driving disk 51 is coaxially arranged with the rotor 1 and is rotatably connected to the rotor 1. There are multiple connecting shafts 53, which are arranged in a ring-shaped array around the center line of the driving disk 51. One end of each connecting shaft 53 is connected to the driving disk 51. There are multiple connecting rods 52, and each connecting rod 52 and connecting shaft 53 corresponds to a multiple scraper mechanism 4. Both ends of each connecting rod 52 are hinged to a multiple rotating shaft and a multiple extension plate 42. The locking part 54 is used to lock the rotation angle of the driving mechanism 5.

[0035] Since the extension plate 42 is slidably connected to the scraper mechanism 4 in the direction of the rotor 1 centerline or away from it, and the drive disk 51 is rotatably connected to the rotor 1, rotating the drive disk 51 will not cause the rotor 1 to rotate with the drive disk, that is, the scraper mechanism 4 will not rotate, thus preventing the extension plate 42 from rotating. The rotation of the drive disk 51 causes the rotating shaft to make a circular motion around the centerline of the drive disk 51, thereby changing the relative position between the rotating shaft and the extension plate 42. Since the length of the connecting rod 52 remains unchanged, the connecting rod 52 will drive the extension plate 42 to move in the direction of the rotor 1 centerline or away from it. With this structure, the drive mechanism 5 can be used to drive the extension plate 42 to slide in the direction of the rotor 1 centerline.

[0036] Since the locking part 54 is used to lock the rotation angle of the drive mechanism 5, when the drive disc 51 drives the extension plate 42 to shorten to the length that just passes through the metering chamber 2, the locking part 54 locks the rotation angle of the drive disc 51. Even if the extension plate 42 does not freely extend or shorten, the normal operation of the scraper mechanism 4 can be guaranteed to a certain extent.

[0037] In this embodiment: the locking part 54 includes a ratchet 541, which is connected to the drive disk 51. The ratchet 541 is coaxially arranged with the drive disk 51, and the inclined direction of the teeth of the ratchet 541 is along the water flow direction. The scraper mechanism 4 also includes a support plate 43, a first spring 44, a second spring 45, and a sliding rod 46. The support plate 43 is arranged parallel to the scraper body 41, and the upper end of the support plate 43 abuts against the recess of the ratchet 541. The upper end surface of the support plate 43 is inclined downwards at one edge facing the water inlet 21 to form a slope. The first spring... The first spring 44 is perpendicular to the supporting plate 43. The two ends of the first spring 44 are respectively connected to the scraper body 41 and the supporting plate 43. The second spring 45 and the sliding rod 46 are both arranged along the length direction of the scraper mechanism 4. The lower end of the sliding rod 46 is slidably connected to the scraper body 41 along the length direction of the first spring 44. The upper end of the sliding rod 46 is slidably connected to the supporting plate 43 along the length direction of the supporting plate 43. The second spring 45 is sleeved on the outer peripheral surface of the sliding rod 46. The two ends of the second spring 45 are respectively connected to the supporting plate 43 and the scraper body 41.

[0038] When the scraper mechanism 4 rotates, the abutment plate 43 rotates together with the scraper body 41. When the scraper mechanism 4 expands due to temperature changes and gets stuck, since the first spring 44 is set perpendicular to the abutment plate 43, and the two ends of the first spring 44 are respectively connected to the scraper body 41 and the abutment plate 43, the water flow will push the abutment plate 43 to move in the direction of compressing the first spring 44. At this time, the upper end of the abutment plate 43 will also move downwards due to the push of the ratchet 541 teeth and its adjacent protrusion. Since the second spring 45 and the sliding rod 46 are both along the scraper mechanism... The sliding rod 46 is slidably connected to the scraper body 41 along the length direction of the first spring 44 at its lower end, and to the abutment plate 43 along the length direction of the abutment plate 43 at its upper end. The second spring 45 is sleeved on the outer circumferential surface of the sliding rod 46, and the two ends of the second spring 45 are respectively connected to the abutment plate 43 and the scraper body 41. The abutment plate 43 is not abutted when it moves downward, so that the upper end of the abutment plate 43 can pass through the protrusion of the ratchet 541 tooth.

[0039] When the upper end of the abutment plate 43 passes the ratchet 541 and its adjacent protrusion, the abutment plate 43 is pushed upward by the second spring 45 and resets. Since the upper end surface of the abutment plate 43 is inclined downward at one edge facing the water inlet 21, the inclined surface abuts the ratchet 541 and drives the ratchet 541 to rotate, thereby causing the drive disk 51 to rotate. The rotation of the drive disk 51 causes the extension plate 42 to slide toward the rotor 1, thereby shortening the scraper mechanism 4. If the scraper mechanism 4 is still stuck after the abutment plate 43 passes the ratchet 541 and its adjacent protrusion, the pressure of the water flow will drive the abutment plate 43 to continue to move to the next adjacent protrusion, and so on, until the length of the scraper is sufficient to pass through the metering chamber 2.

[0040] With this structure, the drive disc 51 can be rotated by water flow, which can shorten the scraper mechanism 4, reduce manual adjustment to a certain extent, and save labor.

[0041] Specifically, the lower end of the supporting plate 43 is recessed upward to form a groove, and the upper end of the sliding rod 46 is slidably engaged in the groove. With this structure, the lower end of the sliding rod 46 can be slidably connected to the scraper body 41 along the length direction of the first spring 44. The scraper body 41 protrudes downward on the lower part of one side facing the supporting plate 43, and the upper end of the protrusion is recessed downward to form a third groove 47. The lower end of the sliding rod 46 is slidably engaged in the third groove.

[0042] In this embodiment: the sidewall of the drive disk 51 is recessed inward to form a first groove 511; the reset mechanism 6 includes a push rod 61 and a slide rod 62. The push rod 61 is arranged along the central axis of the rotor 1, and the slide rod 62 is slidably fitted in the groove. The ratchet 541 can be slidably connected to the outer circumferential surface of the drive disk 51 along the length of the center line of the rotor 1. One end of the push rod 61 passes through the vertical surface of the drive disk 51 and the inner sidewall of the first groove 511 to connect to one end of the slide rod 62. The other end is connected to the inner peripheral wall of the ratchet 541, and the other end of the push rod 61 passes through the outer side wall of the metering chamber 2; the end of the extension plate 42 facing the rotor 1 is recessed inward to form a guide groove 421, the guide rod 422 is slidably fitted in the guide groove 421, the scraper body 41 is connected to the guide rod 422, and also includes a third spring 423, the third spring 423 is sleeved on the guide rod 422, and the two ends of the third spring 423 are respectively connected to the scraper body 41 and the extension plate 42.

[0043] When the scraper mechanism 4 of the high-precision flowmeter of the present invention needs to be reset and calibrated, the operator can pull the push rod 61 to make the push rod 61 drive the ratchet 541 to slide along the length direction of the center line of the drive disk 51, thereby disengaging the teeth of the ratchet 541 from the abutment plate 43. Since the end of the extension plate 42 facing the rotor 1 is recessed inward to form a guide groove 421, the guide rod 422 is slidably engaged in the guide groove 421. The scraper body 41 is connected to the guide rod 422 and also includes a third spring 423. 23 is sleeved on the guide rod 422. The two ends of the fourth spring 76 are respectively connected to the scraper body 41 and the extension plate 42. At this time, the extension plate 42 will extend and reset under the push of the third spring 423, and then push the push rod 61 to reset, so that the teeth of the ratchet 541 can abut against the upper end of the abutment plate 43 again. With this structure, when it is necessary to use the high-precision flow meter of the present invention to measure other industrial water, the scraper mechanism 4 extends and resets, and then automatically adjusts again for the industrial water being measured, which ensures the accuracy of the measurement to a certain extent.

[0044] In this embodiment: the side wall of the metering chamber 2 is recessed inward to form a second annular groove 71. The upper end of the annular groove 71 is located at the upper part of the rotor 1 and the lower end is located at the bottom of the metering chamber 2. It also includes multiple sliders and multiple cleaning brushes 72. The multiple sliders and multiple cleaning brushes 72 correspond one-to-one with multiple scraper mechanisms 4. The multiple sliders can be slidably connected to the second groove 71. The multiple cleaning brushes 72 are arranged along the width direction of the scraper mechanism 4. One end of each of the multiple cleaning brushes 72 is rotatably connected to the multiple sliders.

[0045] With this structure, the cleaning brush 72 can slide along the surface of the scraper mechanism 4 while the scraper is rotating, and clean the surface of the scraper mechanism 4. This reduces the amount of impurities adhering to the surface of the scraper mechanism 4 after long-term use, and reduces the possibility of the flow meter accuracy being reduced due to the adhesion of impurities.

[0046] In this embodiment: the lower part of the metering chamber 2 is recessed to form an impurity tank 73, and a filter plate 74 is connected to the upper end of the impurity tank 73. The filter plate 74 has an opening on the side facing the water inlet 21.

[0047] When the scraper mechanism 4 rotates and pushes the water flow from the bottom, the cleaning brush 72 brushes off the impurities on the surface of the scraper mechanism 4. The impurities at the bottom can enter the impurity tank 73 through the opening with the water flow, and then flow out through the filter plate 74, so that the impurities remain in the impurity tank 73, reducing the possibility that the accumulation of impurities at the bottom will hinder the rotation of the scraper mechanism 4.

[0048] In this embodiment, a cleaning plate 75, a fourth spring 76, and a connecting rod 77 are also included. The filter plate 74 is slidably connected to the impurity tank 73 along the length of the filter plate 74. The upper end face of the cleaning plate 75 abuts against the lower end face of the filter screen. The lower end of the connecting rod 77 is connected to the cleaning plate 75, and the upper end of the connecting rod 77 abuts against the lower end of the scraper mechanism 4. The fourth spring 76 is arranged parallel to the length of the filter plate 74, and the two ends of the fourth spring 76 are respectively connected to the connecting rod 77 and the side wall of the impurity tank 73 near the inlet 21.

[0049] Since the upper end of the connecting rod 77 abuts against the lower end of the scraper mechanism 4, when the scraper mechanism 4 rotates to the lower part of the metering chamber 2, the lower end of the scraper mechanism 4 pushes the connecting rod 77 to move, thereby driving the cleaning plate 75 to move along the length of the filter plate 74. At this time, the fourth spring 76 is stretched by tension. Since the scraper mechanism 4 moves in a circle around the rotor 1, when the scraper mechanism 4 pushes the connecting rod 77 to translate, the lower end of the scraper mechanism 4 will also gradually rise. After the scraper mechanism 4 pushes the connecting rod 77 to translate a certain distance, the lower end of the scraper mechanism 4 will disengage from the upper end of the connecting rod 77. The connecting rod 77 will then reset under the action of the fourth spring 76, so that the cleaning plate 75 can clean the filter plate 74 repeatedly, reducing the possibility of impurities accumulating on the filter plate 74 to a certain extent, thereby ensuring the filtration of impurities by the filter plate 74 to a certain extent.

[0050] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A high-precision flow meter, characterized in that: The system includes a rotor, a metering chamber, a mechanical counter, and a scraper mechanism. The metering chamber has an inlet and an outlet at both ends. The rotor is rotatably connected to the metering chamber, with one end passing through the side wall of the metering chamber and connecting to the mechanical counter. One end of the scraper mechanism is connected to the side wall of the rotor, and the other end abuts against the inner wall of the metering chamber. Multiple scraper mechanisms are arranged in a ring-shaped, spaced array around the rotor's centerline. Each scraper mechanism includes a scraper body, an extension plate, a drive mechanism, and a reset mechanism. One end of the scraper body is connected to the side wall of the rotor. One end of the extension plate is slidably connected to the scraper body, either towards or away from the rotor's centerline, and the other end abuts against the inner side wall of the metering chamber. The drive mechanism drives the extension plate to slide towards the rotor's centerline, and the reset mechanism pushes the extension plate to extend and reset. The driving mechanism includes a driving disk, connecting rods, connecting shafts, and a locking part. The driving disk is coaxially aligned with the rotor and is rotatably connected to the rotor. There are multiple connecting shafts arranged in a ring-shaped array around the center line of the driving disk. One end of each connecting shaft is connected to the driving disk. There are multiple connecting rods, and each connecting rod and connecting shaft corresponds to a multiple scraper mechanism. Both ends of each connecting rod are hinged to the multiple connecting shafts and the multiple extension plates. The locking part is used to lock the rotation angle of the driving mechanism. The drive disk has a first groove formed by an inwardly recessed sidewall; the reset mechanism includes a push rod and a slide rod, the push rod is arranged along the rotor's central axis, and the slide rod is slidably engaged in the first groove; the locking part includes a ratchet, the ratchet is connected to the drive disk, and the ratchet is slidably connected to the outer circumferential surface of the drive disk along the length of the rotor's centerline; one end of the push rod passes through the vertical surface of the drive disk and the inner sidewall of the first groove and is connected to one end of the slide rod; the other end of the slide rod is connected to the inner circumferential wall of the ratchet; the other end of the push rod passes through the outer sidewall of the metering chamber; the extension plate has a guide groove formed by an inwardly recessed end facing the rotor; the scraper body is connected to a guide rod, the guide rod is slidably engaged in the guide groove; and a third spring is also included, the third spring is sleeved on the guide rod, and the two ends of the third spring are respectively connected to the scraper body and the extension plate.

2. The high-precision flow meter according to claim 1, characterized in that: The ratchet is coaxially aligned with the drive disc, and the ratchet teeth are inclined in the direction of water flow. The scraper mechanism further includes a support plate, a first spring, a second spring, and a sliding rod. The support plate is parallel to the scraper body, and its upper end abuts against the recess of the ratchet. The upper end face of the support plate is inclined downwards at one edge facing the water inlet. The first spring is perpendicular to the support plate, and its two ends are connected to the scraper body and the support plate, respectively. The second spring and the sliding rod are both arranged along the length of the scraper mechanism. The lower end of the sliding rod is slidably connected to the scraper body along the length of the first spring, and the upper end of the sliding rod is slidably connected to the support plate along the length of the support plate. The second spring is sleeved on the outer circumferential surface of the sliding rod, and its two ends are connected to the support plate and the scraper body, respectively.

3. A high-precision flow meter according to claim 2, characterized in that: The side wall of the metering chamber is recessed inward to form a second annular groove. The upper end of the annular groove is located at the upper part of the rotor and the lower end is located at the bottom of the metering chamber. The chamber also includes multiple sliders and multiple cleaning brushes. Each slider and cleaning brush corresponds to a scraper mechanism. Each slider can be slidably connected to the second groove. Each cleaning brush is arranged along the width direction of the scraper mechanism. Each cleaning brush is rotatably connected to a slider at one end.

4. A high-precision flow meter according to claim 3, characterized in that: The lower part of the metering chamber is recessed to form an impurity tank, and a filter plate is connected to the upper end of the impurity tank. The filter plate has an opening on the side facing the water inlet.

5. A high-precision flow meter according to claim 4, characterized in that: It also includes a cleaning plate, a fourth spring, and a connecting rod. The filter plate is slidably connected to the impurity tank along the length of the filter plate. The upper end of the cleaning plate abuts against the lower end of the filter plate. The lower end of the connecting rod is connected to the cleaning plate, and the upper end of the connecting rod abuts against the lower end of the scraper mechanism. The fourth spring is arranged parallel to the length of the filter plate, and the two ends of the fourth spring are respectively connected to the connecting rod and the side wall of the impurity tank near the water inlet.

6. A high-precision flow meter according to claim 5, characterized in that: The lower part of the metering chamber is recessed to form an impurity tank, and a filter plate is connected to the upper end of the impurity tank. The filter plate has an opening on the side facing the water inlet.

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