High-precision flow meter

Abstract

The high-precision flowmeter comprises a rotor, a metering chamber, a mechanical counter and a scraper mechanism, a water inlet and a water outlet are formed in the two ends of the metering chamber respectively, the rotor is rotatably connected into the metering chamber, one end of the rotor penetrates through the side wall of the metering chamber to be connected with the mechanical counter, and the other end of the rotor is connected with the scraper mechanism. One end of each scraper mechanism is connected with the side wall of the rotor, the other end of each scraper mechanism abuts against the inner wall of the metering chamber, and the scraper mechanisms are annularly arrayed around the center line of the rotor at intervals. Due to the adoption of the technical scheme, when the high-precision flow meter is used for metering industrial water, the length of the scraper mechanism can be adjusted, so that the situation that the scraper mechanism is stuck under the influence of temperature difference is reduced to a certain extent, and normal use of the flow meter is ensured to a certain extent.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid measurement, and particularly relates to a high-precision flowmeter. Background Art

[0002] A flowmeter is an instrument for measuring the measured flow rate and / or the total amount of fluid within a selected time interval, that is, an instrument for measuring the fluid flow rate in a pipeline or open channel. Flowmeters are classified into differential pressure flowmeters, rotameters, throttling flowmeters, slit flowmeters, positive displacement flowmeters, electromagnetic flowmeters, ultrasonic flowmeters, etc.

[0003] In the process of industrial production, the utilization and recycling of water resources is an important indicator, so professional equipment such as water-saving devices is often used. Among them, positive displacement flowmeters are often used in water-saving special equipment due to their high measurement accuracy. However, due to the different temperatures of industrial water, the water temperature flowing through the flowmeter is relatively high, resulting in the rotor being stuck due to thermal deformation, thus affecting the use of the flowmeter; at the same time, the accumulation of impurities in industrial water in the metering chamber is also likely to cause the flowmeter to be stuck. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a high-precision flowmeter to solve the problems in the prior art that due to the different temperatures of industrial water, the water temperature flowing through the flowmeter is relatively high, resulting in the rotor being stuck due to thermal deformation, thus affecting the use of the flowmeter; at the same time, the accumulation of impurities in industrial water in the metering chamber is also likely to cause the flowmeter to be stuck.

[0005] The present invention is achieved through the following technical solutions: A high-precision flowmeter includes a rotor, a metering chamber, a mechanical counter, and a scraper mechanism. Water inlets and outlets are respectively arranged at both ends of the metering chamber. The rotor is rotatably connected inside 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, and the multiple scraper mechanisms are arranged in an annular interval array around the center line of the rotor. The scraper mechanism includes a scraper main body, an extension plate, a driving mechanism, and a reset mechanism. One end of the scraper main body is connected to the side wall of the rotor. One end of the extension plate is slidably connected to the scraper main body in a direction towards or away from the center line of the rotor, and the other end abuts against the inner side wall of the metering chamber. The driving mechanism is used to drive the extension plate to slide towards the center line of the rotor, and the reset mechanism is used to push the extension plate to extend and reset.

[0006] Further, the driving mechanism includes a driving disk, a connecting rod, a connecting shaft, and a locking portion. The driving disk is coaxially arranged with the rotor, and the driving disk is rotatably connected to the rotor. There are multiple connecting shafts, and the multiple connecting shafts are annularly and spaced apart 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 the multiple connecting rods and connecting shafts respectively correspond to multiple scraper mechanisms. Both ends of each of the multiple connecting rods are respectively hinged to multiple rotating shafts and multiple extension plates. The locking portion is used to lock the rotation angle of the driving mechanism.

[0007] Further, the locking portion includes a ratchet wheel. The ratchet wheel is connected to the driving disk and is coaxially arranged with the driving disk. The inclination direction of the ratchet teeth is arranged along the water flow direction. The scraper mechanism further includes a resisting plate, a first spring, a second spring, and a sliding rod. The resisting plate is arranged parallel to the scraper body. The upper end of the resisting plate abuts against the concave portion of the ratchet wheel. One edge of the upper end surface of the resisting plate facing the water inlet is inclined downward to form an inclined surface. The first spring is arranged perpendicular to the resisting plate, and both ends of the first spring are respectively connected to the scraper body and the resisting plate. The second spring and the sliding rod are both arranged along the length direction of the scraper mechanism. The lower end of the sliding rod is slidably connected to the scraper body along the length direction of the first spring, and the upper end of the sliding rod is slidably connected to the resisting plate along the length direction of the resisting plate. The second spring is sleeved on the outer peripheral surface of the sliding rod, and both ends of the second spring are respectively connected to the resisting plate and the scraper body.

[0008] Further, a first chute is formed by inward depression on the side wall of the driving disk. The reset mechanism includes a push rod and a sliding rod. The push rod is arranged along the central axis direction of the rotor. The sliding rod is slidably matched in the chute. The ratchet wheel is slidably connected to the outer peripheral surface of the driving disk along the length direction of the rotor center line. One end of the push rod passes through the vertical surface of the driving disk and the inner side wall of the first chute to connect one end of the sliding rod. The other end of the sliding rod is connected to the inner peripheral wall of the ratchet wheel. The other end of the push rod passes through the outer side wall of the metering chamber. An orientation groove is formed by inward depression at one end of the extension plate facing the rotor. The guide rod is slidably matched in the orientation groove. The scraper body is connected with a guide rod. A third spring is further included. The third spring is sleeved on the guide rod, and both ends of the third spring are respectively connected to the scraper body and the extension plate.

[0009] Further, a second chute in the shape of a circular ring is formed by the inward depression of the side wall of the metering chamber. The upper end of the circular ring formed by the second chute is located above the rotor, and the lower end is located at the bottom of the metering chamber. It further includes a plurality of sliders and a plurality of cleaning brushes. The plurality of sliders and the plurality of cleaning brushes correspond to the plurality of scraper mechanisms one by one. The plurality of sliders are all slidably connected to the second chute. The plurality of cleaning brushes are all arranged along the width direction of the scraper mechanism. One end of each of the plurality of cleaning brushes is rotatably connected to the plurality of sliders in a one-to-one correspondence.

[0010] Further, a lower part of the metering chamber is depressed downward to form an impurity tank. A filter plate is cooperatively connected to the upper end of the impurity tank. An opening is provided on a side of the filter plate facing the water inlet.

[0011] Further, it further includes a cleaning plate, a fourth spring and a connecting rod. The filter plate is slidably connected to the impurity tank along the length direction of the filter plate. The upper end surface of the cleaning plate abuts against the lower end surface of the filter net. The lower end of the connecting rod is connected to the cleaning plate. The upper end of the connecting rod abuts against the lower end of the scraper mechanism. The fourth spring is arranged along the length direction parallel to the filter plate. Two ends of the fourth spring are respectively connected to the connecting rod and a side wall of the impurity tank close to the water inlet.

[0012] The beneficial effects of the present invention are as follows: When using a high-precision flowmeter of the present invention to measure industrial water, the length of the scraper mechanism can be adjusted, thereby reducing the situation of the scraper mechanism being stuck when affected by temperature difference to a certain extent, and ensuring the normal use of the flowmeter to a certain extent.

[0013] Other advantages, objectives and features of the present invention will be described to some extent in the subsequent description, and to some extent, will be obvious to those skilled in the art based on the study of the following text, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is a structural sectional view of the present invention; Figure 3 is of the present invention Figure 2 partial enlarged view of A therein; Figure 4 is a schematic structural diagram of the scraper mechanism, driving mechanism and reset mechanism of the present invention; Figure 5 is of the present invention Figure 4 partial enlarged view of B therein; Figure 6 is of the present inventionFigure 4 Partial enlarged view of C; Figure 7 of the present invention Figure 4 Partial enlarged view of D; Figure 8 Schematic structural diagram of the connecting rod, cleaning plate and fourth spring of the present invention; Figure 9 Cooperating diagram of the ratchet wheel and the abutting plate of the present invention.

[0015] In the figure: 1, rotor; 2, metering chamber; 21, water inlet; 22, water outlet; 3, mechanical counter; 4, scraper mechanism; 41, scraper body; 42, extension plate; 421, guide groove; 422, guide rod; 423, third spring; 43, abutting plate; 44, first spring; 45, second spring; 46, sliding rod; 47, third chute; 5, driving mechanism; 51, driving disc; 511, first chute; 52, connecting rod; 53, connecting shaft; 54, locking part; 541, ratchet wheel; 6, reset mechanism; 61, pushing rod; 62, sliding rod; 71, second chute; 72, cleaning brush; 73, impurity tank; 74, filter plate; 75, cleaning plate; 76, fourth spring; 77, connecting rod. Detailed implementation manners

[0016] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation manners, structures, features and their effects of the present invention as follows.

[0017] Please refer to Figures 1-9 , the present invention provides a high-precision flowmeter technical solution: including a rotor 1, a metering chamber 2, a mechanical counter 3 and a scraper mechanism 4. Water inlets 21 and water outlets 22 are respectively provided at both ends of the metering chamber 2. The rotor 1 is rotatably connected inside 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 annularly and spacedly arranged around the center line of the rotor 1; The scraper mechanism 4 includes a scraper body 41, an extension plate 42, a driving 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 a direction that can be towards or away from the center line of the rotor 1, and the other end abuts against the inner side wall of the metering chamber 2. The driving mechanism 5 is used to drive the extension plate 42 to slide towards the center line of the rotor 1, and the reset mechanism 6 is used to push the extension plate 42 to extend and reset.

[0018] 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 sufficient for the scraping mechanism 4 to rotate through. Water inlets 21 and water outlets 22 are respectively arranged at both ends of the lower part of the metering chamber 2.

[0019] When using a high-precision flowmeter of the present invention to measure industrial water, first connect the pipeline to the positions of the water inlet 21 and the water outlet 22 by means of bolt fixation. Then, let the industrial water enter the metering chamber 2 from the water inlet 21 through the pipeline. Driven by the water flow, a plurality of scraping mechanisms 4 start to rotate in the direction of the water flow, thereby driving the rotor 1 to rotate. And the mechanical counter 3 measures the number of rotations of the rotor 1. With this structure, the recording of the industrial water flow is completed.

[0020] Since one end of the extension plate 42 is slidably connected to the scraping body 41 in a direction that can face or be away from the center line of the rotor 1, 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 center line of the rotor 1. When the water temperature rises, causing the scraping mechanism 4 and the inner wall of the metering chamber 2 to expand, and thus the scraping mechanism 4 gets stuck, the driving mechanism 5 is used to drive the extension plate 42 to slide in the direction of the rotor 1, so as to adjust the scraping mechanism 4, making the length of the scraping mechanism 4 shorter, so that it does not abut against the inner wall of the metering chamber 2, and enabling the scraping 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 length of the scraping mechanism 4 can become longer and reset after the water temperature drops, facilitating the next use.

[0021] With this structure, when using a high-precision flowmeter of the present invention to measure industrial water, the length of the scraping mechanism 4 can be adjusted, thereby reducing to a certain extent the situation where the scraping mechanism 4 gets stuck when affected by temperature difference, and ensuring the normal use of the flowmeter to a certain extent.

[0022] In this embodiment: The driving mechanism 5 includes a driving disk 51, a connecting rod 52, a connecting shaft 53 and a locking part 54. The driving disk 51 is coaxially arranged with the rotor 1. The driving disk 51 is rotatably connected to the rotor 1. There are a plurality of connecting shafts 53, and the plurality of connecting shafts 53 are annularly and spacedly arranged around the center line of the driving disk 51. One end of the connecting shaft 53 is connected to the driving disk 51. There are a plurality of connecting rods 52, and the plurality of connecting rods 52 and the connecting shafts 53 respectively correspond to a plurality of scraping mechanisms 4. Both ends of the plurality of connecting rods 52 are respectively hinged to the plurality of rotating shafts and the plurality of extension plates 42. The locking part 54 is used to lock the rotation angle of the driving mechanism 5.

[0023] Since the elongation plate 42 is slidably connected to the scraper mechanism 4 in a direction towards or away from the center line of the rotor 1, and the drive disk 51 is rotatably connected to the rotor 1, when the drive disk 51 rotates, the rotor 1 will not rotate with the rotating disk, that is, the scraper mechanism 4 will not rotate, so that the elongation plate 42 will not rotate. The rotation of the drive disk 51 drives the rotating shaft to perform a circular motion around the center line of the drive disk 51, thereby changing the relative position between the rotating shaft and the elongation plate 42. Since the length of the connecting rod 52 remains unchanged, the connecting rod 52 will drive the elongation plate 42 to move in a direction towards or away from the center line of the rotor 1. With this structure, the drive mechanism 5 can be used to drive the elongation plate 42 to slide towards the center line of the rotor 1.

[0024] Since the locking portion 54 is used to lock the rotation angle of the drive mechanism 5, when the drive disk 51 drives the elongation plate 42 to shorten to just pass through the length of the metering chamber 2, the locking portion 54 locks the rotation angle of the drive disk 51, so that the elongation plate 42 will not freely elongate and shorten, which can ensure the normal operation of the scraper mechanism 4 to a certain extent.

[0025] In this embodiment: the locking portion 54 includes a ratchet wheel 541, the ratchet wheel 541 is connected to the drive disk 51, the ratchet wheel 541 is coaxially arranged with the drive disk 51, and the inclination direction of the tooth portion of the ratchet wheel 541 is arranged along the water flow direction; the scraper mechanism 4 further includes a holding plate 43, a first spring 44, a second spring 45 and a sliding rod 46. The holding plate 43 is arranged parallel to the scraper main body 41, the upper end of the holding plate 43 abuts against the concave portion of the ratchet wheel 541, and one edge of the upper end surface of the holding plate 43 facing the water inlet 21 is inclined downward to form an inclined surface; the first spring 44 is arranged perpendicular to the holding plate 43, and both ends of the first spring 44 are respectively connected to the scraper main body 41 and the holding 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 main body 41 along the length direction of the first spring 44, the upper end of the sliding rod 46 is slidably connected to the holding plate 43 along the length direction of the holding plate 43, the second spring 45 is sleeved on the outer peripheral surface of the sliding rod 46, and both ends of the second spring 45 are respectively connected to the holding plate 43 and the scraper main body 41.

[0026] When the scraper mechanism 4 rotates, the abutting plate 43 rotates together with the scraper main body 41. When the scraper mechanism 4 is jammed due to thermal expansion, since the first spring 44 is arranged perpendicular to the abutting plate 43, and the two ends of the first spring 44 are respectively connected to the scraper main body 41 and the abutting plate 43, the water flow will push the abutting plate 43 to move in the direction of compressing the first spring 44. At this time, the upper end of the abutting plate 43 will also move downward under the push of the tooth part of the ratchet wheel 541 and an adjacent convex part. Since 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 main body 41 along the length direction of the first spring 44, the upper end of the sliding rod 46 is slidably connected to the abutting plate 43 along the length direction of the abutting plate 43, the second spring 45 is sleeved on the outer peripheral surface of the sliding rod 46, and the two ends of the second spring 45 are respectively connected to the abutting plate 43 and the scraper main body 41. The downward movement of the abutting plate 43 is not restricted either, so that the upper end of the abutting plate 43 can pass through the convex part of the tooth part of the ratchet wheel 541; After the upper end of the abutting plate 43 passes through the tooth part of the ratchet wheel 541 and an adjacent convex part, the abutting plate 43 is pushed by the second spring 45 to reset upward. Since the edge of the upper end surface of the abutting plate 43 facing the water inlet 21 is inclined downward to form an inclined surface, the inclined surface abuts against the tooth part of the ratchet wheel 541 to drive the ratchet wheel 541 to rotate, so that the driving disc 51 rotates. The rotation of the driving disc 51 drives the extension plate 42 to slide toward the rotor 1, so that the scraper mechanism 4 becomes shorter; If the scraper mechanism 4 is still jammed after the abutting plate 43 passes through the tooth part of the ratchet wheel 541 and an adjacent convex part, the pressure of the water flow will drive the abutting plate 43 to continue to move to the next adjacent convex part, and so on until the length of the scraper is sufficient to pass through the metering chamber 2.

[0027] With this structure, the driving disc 51 can be driven to rotate by the water flow, and the scraper mechanism 4 can be shortened, which reduces manual debugging to a certain extent and saves labor to a certain extent.

[0028] Specifically, a groove is formed by the downward depression of the lower end surface of the abutting plate 43, and the upper end of the sliding rod 46 is slidably fitted in the groove. With this structure, the lower end of the sliding rod 46 can be slidably connected to the scraper main body 41 along the length direction of the first spring 44; A convex part is formed by the protrusion of the lower part of the side surface of the scraper main body 41 facing the abutting plate 43, and a third chute 47 is formed by the downward depression of the upper end surface of the convex part. The lower end of the sliding rod 46 is slidably fitted in the third groove.

[0029] In this embodiment: A first chute 511 is formed by inward depression on the side wall of the drive disk 51; the reset mechanism 6 includes a push rod 61 and a sliding rod 62. The push rod 61 is arranged along the central axis direction of the rotor 1. The sliding rod 62 is slidably fitted in the chute. The ratchet wheel 541 is slidably connected to the outer peripheral surface of the drive disk 51 along the length direction of the central 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 side wall of the first chute 511 to connect one end of the sliding rod 62. The other end of the sliding rod 62 is connected to the inner peripheral wall of the ratchet wheel 541. The other end of the push rod 61 passes through the outer side wall of the metering chamber 2; One end of the extension plate 42 facing the rotor 1 is inwardly recessed to form a guiding groove 421. The guiding rod 422 is slidably fitted in the guiding groove 421. The scraping plate body 41 is connected with the guiding rod 422. A third spring 423 is further included. The third spring 423 is sleeved on the guiding rod 422. Two ends of the third spring 423 are respectively connected to the scraping plate body 41 and the extension plate 42.

[0030] When it is necessary to calibrate the reset of the scraping plate mechanism 4 of a high-precision flowmeter of the present invention, an operator can pull the push rod 61 to drive the ratchet wheel 541 to slide along the length direction of the central line of the drive disk 51, so that the tooth part of the ratchet wheel 541 disengages from the abutting plate 43. Since one end of the extension plate 42 facing the rotor 1 is inwardly recessed to form a guiding groove 421, the guiding rod 422 is slidably fitted in the guiding groove 421. The scraping plate body 41 is connected with the guiding rod 422. A third spring 423 is further included. The third spring 423 is sleeved on the guiding rod 422. Two ends of the fourth spring 76 are respectively connected to the scraping plate 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 tooth part of the ratchet wheel 541 can abut against the upper end of the abutting plate 43 again. With this structure, when it is necessary to use a high-precision flowmeter of the present invention to measure other industrial water, the scraping plate mechanism 4 extends and resets, and then automatically debugs the industrial water to be measured again. To a certain extent, the measurement accuracy is guaranteed.

[0031] In this embodiment: A second chute 71 in a circular ring shape is formed by inward depression on the side wall of the metering chamber 2. The upper end of the circular ring formed by the second chute 71 is located above the rotor 1, and the lower end is located at the bottom of the metering chamber 2. A plurality of sliders and a plurality of cleaning brushes 72 are further included. The plurality of sliders and the plurality of cleaning brushes 72 respectively correspond to the plurality of scraping plate mechanisms 4 one by one. The plurality of sliders are all slidably connected to the second chute 71. The plurality of cleaning brushes 72 are all arranged along the width direction of the scraping plate mechanism 4. One ends of the plurality of cleaning brushes 72 are respectively rotatably connected to the plurality of sliders in a one-to-one correspondence.

[0032] With this structure, while the cleaning brush 72 rotates driven by the scraper, it can slide along the surface of the scraper mechanism 4 to clean the surface of the scraper mechanism 4, reducing to a certain extent the attachment of impurities to the surface of the scraper mechanism 4 after long-term use, and reducing to a certain extent the possibility of the accuracy of the flowmeter being reduced due to the attachment of impurities.

[0033] In this embodiment: a lower portion of the metering chamber 2 is recessed downward to form an impurity groove 73, an upper end of the impurity groove 73 is connected with a filter plate 74 in a mating manner, and an opening is provided on a side of the filter plate 74 facing the water inlet 21.

[0034] When the scraper mechanism 4 rotates to push the water flow through from the lower part, after the cleaning brush 72 brushes off the impurities on the surface of the scraper mechanism 4, the impurities in the lower part can enter the impurity groove 73 through the opening along with the water flow, and flow out through the filter plate 74, so that the impurities stay in the impurity groove 73, reducing the possibility that the rotation of the scraper mechanism 4 is resisted due to the accumulation of impurities at the bottom.

[0035] In this embodiment: it further includes a cleaning plate 75, a fourth spring 76 and a connecting rod 77. The filter plate 74 is connected to the impurity groove 73 in a slidable manner along the length direction of the filter plate 74. An upper end surface of the cleaning plate 75 abuts against a lower end surface of the filter net. A lower end of the connecting rod 77 is connected to the cleaning plate 75, and an upper end of the connecting rod 77 abuts against a lower end of the scraper mechanism 4. The fourth spring 76 is arranged along the length direction parallel to the filter plate 74, and two ends of the fourth spring 76 are respectively connected to the connecting rod 77 and a side wall of the impurity groove 73 close to the water inlet 21.

[0036] 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 direction of the filter plate 74. At this time, the fourth spring 76 is stretched under tension; since the scraper mechanism 4 makes a circular motion 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 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, and the connecting rod 77 will be reset under the drive of the fourth spring 76, so that the cleaning plate 75 can clean the filter plate 74 reciprocally, reducing to a certain extent the possibility of impurities accumulating on the filter plate 74, and thus ensuring to a certain extent the filtering of impurities by the filter plate 74.

[0037] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to the equivalent embodiments of equivalent changes within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A high-precision flowmeter, characterized in that: It includes a rotor, a metering chamber, a mechanical counter and a scraper mechanism. Water inlets and outlets are respectively arranged at both ends of the metering chamber. The rotor is rotatably connected inside 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, and the multiple scraper mechanisms are arranged in a circularly spaced array around the center line of the rotor. The scraper mechanism includes a scraper body, an extension plate, a driving 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 in a direction towards or away from the center line of the rotor, and the other end abuts against the inner side wall of the metering chamber. The driving mechanism is used to drive the extension plate to slide towards the center line of the rotor, and the reset mechanism is used to push the extension plate to extend and reset.

2. The high-precision flowmeter according to claim 1, wherein: The driving mechanism includes a driving disk, connecting rods, connecting shafts and a locking part. The driving disk is arranged coaxially with the rotor. The driving disk is rotatably connected to the rotor. There are multiple connecting shafts, and the multiple connecting shafts are arranged in a circularly spaced array around the center line of the driving disk. One end of the connecting shaft is connected to the driving disk. There are multiple connecting rods, and the multiple connecting rods and connecting shafts respectively correspond to the multiple scraper mechanisms. Both ends of the multiple connecting rods are respectively hinged to the multiple rotating shafts and the multiple extension plates. The locking part is used to lock the rotation angle of the driving mechanism.

3. The high-precision flowmeter according to claim 2, wherein: The locking part includes a ratchet wheel. The ratchet wheel is connected to the driving disk. The ratchet wheel is arranged coaxially with the driving disk. The inclination direction of the tooth part of the ratchet wheel is arranged along the water flow direction. The scraper mechanism further includes a supporting plate, a first spring, a second spring and a sliding rod. The supporting plate is arranged parallel to the scraper body. The upper end of the supporting plate abuts against the concave part of the ratchet wheel. The edge of the upper end surface of the supporting plate facing the water inlet is inclined downward to form an inclined surface. The first spring is arranged perpendicular to the supporting plate. Both ends of the first spring are respectively connected to the scraper body and the supporting plate. The second spring and the sliding rod are both arranged along the length direction of the scraper mechanism. The lower end of the sliding rod is slidably connected to the scraper body along the length direction of the first spring, and the upper end of the sliding rod is slidably connected to the supporting plate along the length direction of the supporting plate. The second spring is sleeved on the outer peripheral surface of the sliding rod. Both ends of the second spring are respectively connected to the supporting plate and the scraper body.

4. The high-precision flowmeter according to claim 3, wherein: A first chute is formed by inward depression on the side wall of the driving disk; the reset mechanism includes a push rod and a sliding rod. The push rod is arranged along the central axis direction of the rotor. The sliding rod is slidably fitted in the chute. The ratchet wheel is slidably connected to the outer peripheral surface of the driving disk along the length direction of the central line of the rotor. One end of the push rod passes through the vertical surface of the driving disk and the inner side wall of the first chute to connect one end of the sliding rod. The other end of the sliding rod is connected to the inner peripheral wall of the ratchet wheel. The other end of the push rod passes through the outer side wall of the metering chamber; a guiding groove is formed by inward depression at one end of the elongating plate facing the rotor. The guiding rod is slidably fitted in the guiding groove. The scraping plate body is connected with the guiding rod. A third spring is further included. The third spring is sleeved on the guiding rod. Two ends of the third spring are respectively connected to the scraping plate body and the elongating plate.

5. The high-precision flowmeter according to claim 4, wherein: A second chute in a circular ring shape is formed by inward depression on the side wall of the metering chamber. The upper end of the circular ring formed by the second chute is located above the rotor, and the lower end is located at the bottom of the metering chamber. A plurality of sliders and a plurality of cleaning brushes are further included. The plurality of sliders and the plurality of cleaning brushes respectively correspond to a plurality of scraping mechanisms. The plurality of sliders are all slidably connected to the second chute. The plurality of cleaning brushes are all arranged along the width direction of the scraping mechanism. One ends of the plurality of cleaning brushes are respectively rotatably connected to the plurality of sliders in a one-to-one correspondence.

6. The high-precision flowmeter according to claim 5, wherein: An impurity groove is formed by downward depression at the lower part of the metering chamber. A filter plate is connected in a matching manner at the upper end of the impurity groove. An opening is provided on one side of the filter plate facing the water inlet.

7. The high-precision flowmeter according to claim 6, characterized in that: A cleaning plate, a fourth spring and a connecting rod are further included. The filter plate is slidably connected to the impurity groove along the length direction of the filter plate. The upper end surface of the cleaning plate abuts against the lower end surface of the filter net. The lower end of the connecting rod is connected to the cleaning plate. The upper end of the connecting rod abuts against the lower end of the scraping mechanism. The fourth spring is arranged along the length direction parallel to the filter plate. Two ends of the fourth spring are respectively connected to the connecting rod and the side wall of the impurity groove close to the water inlet.

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