High-precision flow metering device and metering method thereof

Abstract

The invention discloses a high-precision flow metering device and a metering method thereof, and relates to the technical field of flow metering, the high-precision flow metering device comprises a water inlet valve, a controllable valve, a meter, a pressure sensor, a buffer and a faucet which are sequentially arranged from the water inlet end to the water outlet end of a waterway, and a control module is electrically connected with the meter and can obtain water consumption according to metering of the meter; the control module is in communication connection with the master control platform, water fees can be pre-stored, a digital display screen is arranged on the control module, and the digital display screen is used for displaying water fee details and water consumption data; the controllable valve is used for cutting off and circulating a water path, the meter is used for metering the flow of water flowing through the water path, the pressure sensor is used for detecting the pressure in the water path, and the buffer is used for storing energy. The problems of an existing water meter are solved, and the metering precision of the flow metering device is improved.

Description

Technical Field

[0001] The present application relates to the technical field of flow measurement, and in particular to a high-precision flow measurement device and a measurement method thereof. Background Art

[0002] A water meter is an instrument that measures water flow, mostly the cumulative flow of water.

[0003] At present, there are the following problems with civil water meters:

[0004] When users use water normally, the initial flow of water after turning on the faucet is unstable, the water flow from the faucet fluctuates, the pressure fluctuates significantly, and water spraying is likely to occur, affecting the user's water use experience; furthermore, due to the long service life of the faucet or installation reasons, dripping may occur, and the amount of dripping water is very small, which cannot be measured by ordinary water meters. In other words, the faucet is dripping and leaking, but the water meter cannot measure it, and the flow measurement of the water meter is inaccurate, causing losses to the water supply unit. Summary of the invention

[0005] In order to solve the problems existing in the existing water meters and improve the stability of the water flow rate and the metering accuracy of the flow metering device, the present application provides a high-precision flow metering device and a metering method thereof.

[0006] The high-precision flow metering device and the metering method provided in this application adopt the following technical solutions.

[0007] A high-precision flow metering device, including a controllable valve, a meter, a pressure sensor, and a buffer arranged in sequence from the water inlet to the water outlet of the waterway, a control module electrically connected to the meter, capable of obtaining water consumption according to the metering of the meter, a control module communicatively connected to a master control platform, water charges may be pre-stored, and a digital display screen is arranged on the control module, the digital display screen displays water charge details and water consumption data;

[0008] The controllable valve is used for cutting off and circulating the waterway, the meter is used for measuring the water flow rate flowing through the waterway, the pressure sensor is used for detecting the pressure in the waterway, and the buffer is used for storing energy.

[0009] By adopting the above technical solution, a controllable valve, a pressure sensor and a buffer are arranged on the water path measured by the meter, so that the measuring accuracy of the meter can be improved. The pressure sensor is set to set the upper and lower pressure limits, and the opening and closing of the controllable valve are controlled, thereby realizing water outlet control of the water path. The setting of the buffer can play a role in buffering and storing the flow in the water path, thereby realizing normal measurement of the meter.

[0010] Optionally, the controllable valve, meter, pressure sensor, buffer, and control module are all located inside the outer shell, and the digital display screen is arranged on the surface of the outer shell.

[0011] By adopting the above technical solution, the controllable valve, meter, pressure sensor, buffer, and control module are arranged in the outer shell to realize an integrated structural design with a high degree of integration, which reduces the overall volume and space occupancy and is conducive to improving the convenience of installation and use.

[0012] Optionally, the buffer includes a buffer shell and a water storage air bag, the buffer shell is provided with a connecting pipe, the opening of the water storage air bag is sleeved on the inner end of the connecting pipe on the buffer shell, and a clamp is provided on the inner end of the connecting pipe.

[0013] By adopting the above technical solution, through the setting of the water storage airbag, a certain capacity for water storage can be used to prevent the water volume from being too small, that is, the dripping water volume is too small and is lower than the starting flow of the meter and cannot be measured. When dripping occurs, the pressure sensor detects that the pressure reaches the set pressure lower limit, the controllable valve opens, the water path can be replenished with sufficient water, and the buffer can store more water, that is, the flow through the meter is large, ensuring that the meter can measure normally.

[0014] Optionally, the buffer shell includes an upper buffer shell and a lower buffer shell, and the upper buffer shell and the lower buffer shell are connected via a clamping male head and a clamping female head.

[0015] Optionally, a plurality of snap-fit ​​female heads are provided on the lower buffer shell, the snap-fit ​​female head comprises a female body connected to the lower buffer shell, side spring plates are provided on both sides of the end of the female body, convex bodies are provided on the inner sides of the two side spring plates, a snap-fit ​​hole is provided on the female body, the snap-fit ​​male head comprises a male body connected to the upper buffer shell, concave bodies are provided on both sides of the male body, end spring plates are provided at the end of the male body, and barbs are provided at the ends of the end spring plates.

[0016] By adopting the above technical solution, through the setting of the snap-in male head and the snap-in female head, they can be quickly plugged together, and the upper buffer shell and the lower buffer shell are connected by the snap-in male head and the snap-in female head, and the connection is quick and reliable.

[0017] Optionally, the outer end of the connecting pipe is connected to the water circuit through a quick connection mechanism, and the quick connection mechanism includes a water pipe interface connected to the water circuit, and the inner wall of one end of the water pipe interface is provided with a clamping part, a diameter expansion part and a sealing part in sequence, the inner diameter of the clamping part is smaller than the inner diameter of the diameter expansion part, and the inner diameter of the diameter expansion part is larger than the inner diameter of the inner hole of the water pipe interface, a sealing ring groove is provided at the inner diameter of the sealing part, and a sealing ring is provided in the sealing ring groove, a movable sleeve is inserted into one end of the water pipe interface, and a convex edge portion is provided at one end of the movable sleeve, a pre-tightening spring is sleeved on the movable sleeve between the convex edge portion and the water pipe interface, and the other end of the movable sleeve is divided into a plurality of elastic sheets, and a stopper portion is provided at the end of the elastic sheet;

[0018] The outer end of the connecting pipe is inserted into the water pipe interface, and a stop ring groove is provided on the outer diameter of the outer end of the connecting pipe.

[0019] By adopting the above technical solution and setting up a quick connection mechanism, during installation, it is only necessary to align the connecting pipe with the movable sleeve and then insert it into the water pipe interface to complete the connection. The sealing ring is set to achieve good sealing performance. When disassembly is required, it is only necessary to push the connecting pipe and the movable sleeve at the same time so that the movable sleeve is disengaged from the retaining ring groove and the connecting pipe can be pulled out. This connection method is simple and reliable, easy to operate, and convenient for personnel to inspect and maintain.

[0020] According to the metering method of the high-precision flow metering device described above, the water inlet valve is always open, including the metering method of normal water use:

[0021] S1, the controllable valve is in the closed state, the faucet is turned on, water flows out of the water channel at the rear end of the controllable valve, and the pressure sensor detects the pressure in the water channel;

[0022] S2. When the pressure sensor detects that the pressure in the water channel reaches the set pressure lower limit, the controllable valve opens, the water channel flows out normally, and the meter performs measurement;

[0023] S3. After the faucet is turned off, when the pressure sensor detects that the pressure in the water circuit reaches the set pressure upper limit, the controllable valve is closed and the meter stops measuring;

[0024] Also includes tap drip metering method:

[0025] S1, the controllable valve and the faucet are both in the closed state, and the faucet drips, causing the water pressure between the controllable valve and the faucet to drop. When the pressure sensor detects that the pressure reaches the set pressure lower limit, the controllable valve opens, and water enters the water path between the controllable valve and the faucet from the water inlet end;

[0026] S2, when the pressure sensor detects that the pressure reaches the set pressure upper limit, the controllable valve is closed;

[0027] S3. The meter measures the amount of water entering the waterway after the controllable valve is opened.

[0028] Optionally, the controllable valves in the normal water usage metering method and the faucet dripping metering method are both closed with a delay, and the controllable valves are closed with a delay of 3 seconds.

[0029] By adopting the above technical solution, when water is used normally, the water flow reaches the starting flow of the meter, the meter provides a signal to the control module, and the control module controls the controllable valve to be normally open. Turn off the faucet and stop using water. The control module controls the opening and closing of the controllable valve according to the pressure detected by the pressure sensor.

[0030] Optionally, the faucet dripping metering method is as follows: when the controllable valve is opened, water enters the water path between the controllable valve and the faucet from the water inlet end and fills the buffer.

[0031] By adopting the above technical solution and setting the buffer, after the pressure in the water circuit drops to reach the set pressure lower limit, the controllable valve opens and a large amount of water enters the water circuit, which can reach the starting flow of the meter. The meter can then measure normally, thereby realizing the measurement of the dripping water volume, improving the accuracy of the measurement, and avoiding losses to the water supply unit.

[0032] Optionally, the normal pressure in the water channel is 0.2 MPa, the upper limit is set to 0.18 MPa, and the lower limit is set to 0.05 MPa.

[0033] In summary, this application at least includes the following beneficial effects:

[0034] 1. The present application can improve the metering accuracy of the meter by arranging a controllable valve, a pressure sensor and a buffer on the water path measured by the meter. By setting the pressure sensor, the water pressure in the water path is detected, and the upper and lower pressure limits are set to control the closing and opening of the controllable valve, thereby realizing water outlet control of the water path. After the pressure in the water path drops to reach the set pressure lower limit, the controllable valve opens to allow a large amount of water to enter the water path, which can reach the starting flow of the meter. The meter measures normally, thereby realizing accurate measurement of the dripping water volume and avoiding losses to the water supply unit.

[0035] 2. The controllable valves of this application are all closed with a time delay. When the water flow reaches the starting flow of the meter during normal water use, the meter provides a signal to the control module, and the control module controls the controllable valve to be normally open. Turn off the faucet and stop using water. The control module controls the opening and closing of the controllable valve according to the pressure detected by the pressure sensor.

[0036] 3. The buffer shell of the present application includes an upper buffer shell and a lower buffer shell. The upper buffer shell and the lower buffer shell are connected by a snap-on male head and a snap-on female head. Through the setting of the snap-on male head and the snap-on female head, they can be quickly plugged together, and the connection is quick and reliable.

[0037] 4. The outer end of the connecting pipe of the present application is connected to the water channel through a quick connection mechanism. Through the setting of the quick connection mechanism, during installation, it is only necessary to align the connecting pipe with the movable sleeve and insert it into the water pipe interface to complete the connection. The sealing ring is set to achieve good sealing. When disassembly is required, it is only necessary to push the connecting pipe and the movable sleeve at the same time so that the movable sleeve is disengaged from the retaining ring groove and the connecting pipe can be pulled out. This connection method is simple and reliable, easy to operate, and convenient for personnel to inspect and maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 It is a schematic diagram of the high-precision flow metering device in Example 1.

[0040] Figure 2 It is a partial structural schematic diagram of the high-precision flow metering device in Example 1.

[0041] Figure 3 It is a schematic diagram of the structure of the buffer and the quick connection mechanism.

[0042] Figure 4 It is a schematic diagram of the structure of a male snap-in connector and a female snap-in connector.

[0043] Figure 5 It is a schematic diagram of the cross-sectional structure of the quick connection mechanism.

[0044] Figure 6 yes Figure 5 Schematic diagram of the explosion structure.

[0045] Figure 7 It is a schematic diagram of the high-precision flow metering device in the second embodiment.

[0046] Explanation of the reference numerals: 1. water inlet valve; 2. controllable valve; 3. meter; 4. pressure sensor; 5. buffer; 6. faucet; 7. buffer shell; 8. connecting pipe; 9. snap-fit ​​male head; 10. snap-fit ​​female head; 11. female body; 12. side spring piece; 13. convex body; 14. clamping hole; 15. male body; 16. concave body; 17. end spring piece; 18. barb; 19. water pipe interface; 20. snap-fit ​​part; 21. diameter expansion part; 22. sealing part; 23. sealing ring; 24. movable sleeve; 25. convex edge part; 26. preload spring; 27. elastic sheet; 28. stop part; 29. ​​stop ring groove; 30. outer shell. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] The following is combined with Figures 1 to 7This application is described in further detail.

[0049] The embodiments of the present application disclose a high-precision flow metering device and a metering method thereof.

[0050] Embodiment 1

[0051] Reference Figures 1 to 6 , high-precision flow metering device, including:

[0052] The water inlet valve 1 is arranged at the water inlet end of the water path, and the faucet 6 is arranged at the water outlet end of the water path.

[0053] A water inlet valve 1, a controllable valve 2, a meter 3, a pressure sensor 4, a buffer 5 and a faucet 6 are arranged in sequence from the water inlet end to the water outlet end of the water channel. A control module is also arranged. The control module is electrically connected to the meter 3 and can obtain the water consumption according to the measurement of the meter 3. The control module is communicatively connected to the general control platform and can pre-store water charges. A digital display screen is arranged on the control module, which displays the water charge details and water consumption data.

[0054] The flow metering device adopts the card number pre-charging method to recharge the water fee into the main control platform. The control module controls the water output through the controllable valve 2 to realize water consumption billing. When the balance is low, a reminder is issued. When the balance is insufficient, the control module controls the controllable valve 2 to close the water channel to stop the water supply.

[0055] The controllable valve 2 is used for cutting off and flowing the waterway, the meter 3 is used for measuring the water flow rate flowing through the waterway, the pressure sensor 4 is used for detecting the pressure in the waterway, and the buffer 5 is used for energy storage.

[0056] The buffer 5 includes a buffer shell 7 and a water storage airbag. A connecting pipe 8 is arranged on the buffer shell 7. The opening of the water storage airbag is sleeved on the inner end of the connecting pipe 8 on the buffer shell 7, and a clamp is arranged on the inner end of the connecting pipe 8. By setting the water storage airbag, a certain capacity is provided for storing water, which can prevent the water volume from being too small, that is, the dripping water volume is too small, and it is lower than the starting flow of the meter 3 and cannot be measured. When dripping occurs, the pressure sensor 4 detects that the pressure reaches the set pressure lower limit, and the controllable valve 2 opens, and sufficient water can be added to the waterway. The buffer 5 can store more water, that is, the flow through the meter 3 is large, ensuring that the meter 3 can measure normally.

[0057] The buffer shell 7 includes an upper buffer shell and a lower buffer shell, and the upper buffer shell and the lower buffer shell are connected by a snap-fit ​​male head 9 and a snap-fit ​​female head 10. A plurality of snap-fit ​​female heads 10 are arranged at intervals along the circumferential direction on the upper edge of the lower buffer shell, and the snap-fit ​​female head 10 includes a female body 11 connected to the lower buffer shell, and side spring pieces 12 are arranged on both sides of the end of the female body 11, and convex bodies 13 are arranged on the inner sides of the two side spring pieces 12, and a snap hole 14 is opened on the female body 11, and the snap-fit ​​male head 9 includes a male body 15 connected to the upper buffer shell, and concave bodies 16 are arranged on both sides of the male body 15, and end spring pieces 17 are arranged at the end of the male body 15, and barbs 18 are arranged at the end of the end spring pieces 17. Through the arrangement of the snap-fit ​​male head 9 and the snap-fit ​​female head 10, they can be quickly plugged together, and the upper buffer shell and the lower buffer shell are connected by the snap-fit ​​male head 9 and the snap-fit ​​female head 10, and the connection is quick and reliable.

[0058] The outer end of the connecting pipe 8 is connected to the waterway through a quick connection mechanism, which includes a water pipe interface 19 connected to the waterway, and the inner wall of one end of the water pipe interface 19 is provided with a clamping part 20, a diameter expansion part 21 and a sealing part 22 in sequence, the inner diameter of the clamping part 20 is smaller than the inner diameter of the diameter expansion part 21, the inner diameter of the diameter expansion part 21 is larger than the inner diameter of the inner hole of the water pipe interface 19, a sealing ring groove is provided at the inner diameter of the sealing part 22, and a sealing ring 23 is provided in the sealing ring groove, a movable sleeve 24 is inserted into one end of the water pipe interface 19, a convex edge 25 is provided at one end of the movable sleeve 24, a preload spring 26 is sleeved on the movable sleeve 24 between the convex edge 25 and the water pipe interface 19, and the other end of the movable sleeve 24 is divided into a plurality of elastic sheets 27, and a stopper 28 is provided at the end of the elastic sheet 27. The outer end of the connecting pipe 8 is inserted into the water pipe interface 19, and a stopper ring groove 29 is provided on the outer diameter of the outer end of the connecting pipe 8. Through the setting of the quick connection mechanism, during installation, it is only necessary to align the connecting pipe 8 with the movable sleeve 24 and then insert it into the water pipe interface 19 to complete the connection. The sealing ring 23 has good sealing performance. When disassembly is required, it is only necessary to push the connecting pipe 8 and the movable sleeve 24 at the same time to disengage the movable sleeve 24 from the retaining ring groove 29 to pull out the connecting pipe 8. This connection method is simple and reliable, easy to operate, and convenient for personnel to inspect and maintain.

[0059] By setting a controllable valve 2, a pressure sensor 4 and a buffer 5 on the water path measured by the meter 3, the measuring accuracy of the meter 3 can be improved. By setting the pressure sensor 4, the water pressure in the water path is detected, and the upper and lower pressure limits are set to control the closing and opening of the controllable valve 2, thereby realizing the water outlet control of the water path. The setting of the buffer 5 can play a role in flow buffering and storage, thereby realizing the normal water consumption metering and the metering of dripping water of the meter 3.

[0060] The metering method of the high-precision flow metering device is that the water inlet valve 1 is normally open.

[0061] Including normal water usage measurement methods:

[0062] S1, the controllable valve 2 is in the closed state, the faucet 6 is turned on, the water in the water path at the rear end of the controllable valve 2 flows out, and the pressure sensor 4 detects the pressure in the water path between the controllable valve 2 and the faucet 6;

[0063] S2, when the pressure sensor 4 detects that the pressure in the water path between the controllable valve 2 and the faucet 6 reaches the set pressure lower limit, the controllable valve 2 opens, the water path flows out normally, and the meter 3 performs metering;

[0064] S3, after the faucet 6 is closed, when the pressure sensor 4 detects that the pressure in the water path between the controllable valve 2 and the faucet 6 reaches the set pressure upper limit, the controllable valve 2 is closed and the meter 3 stops measuring.

[0065] Also includes 6 drip metering methods for taps:

[0066] S1, the controllable valve 2, and the faucet 6 are all in the closed state. The dripping of the faucet 6 causes the pressure of the water path between the controllable valve 2 and the faucet 6 to drop. When the pressure sensor 4 detects that the pressure reaches the set pressure lower limit, the controllable valve 2 opens, and water enters the water path between the controllable valve 2 and the faucet 6 from the water inlet end;

[0067] S2, when the pressure sensor 4 detects that the pressure reaches the set pressure upper limit, the controllable valve 2 is closed;

[0068] S3, the meter 3 measures the amount of water entering the water path between the controllable valve 2 and the faucet 6 after the controllable valve 2 is opened.

[0069] The normal pressure in the water channel is 0.2MPa, the upper limit is set to 0.18MPa, and the lower limit is set to 0.05MPa.

[0070] In both the metering method for normal water use and the metering method for dripping of the tap 6, the controllable valve 2 is closed with a delay of 3 seconds. During normal water use, the water flow reaches the starting flow of the meter 3, and the meter 3 provides a signal to the control module, and the control module controls the controllable valve 2 to be normally open. When the tap 6 is closed, water use stops, and the control module controls the opening and closing of the controllable valve 2 according to the pressure detected by the pressure sensor 4.

[0071] Method for measuring dripping of faucet 6: When controllable valve 2 is opened, water enters the waterway between controllable valve 2 and faucet 6 from the water inlet end and fills buffer 5. Through the setting of buffer 5, after the pressure in the waterway between controllable valve 2 and faucet 6 drops to the set pressure lower limit, controllable valve 2 opens. Due to the setting of buffer 5, the amount of water entering the waterway between controllable valve 2 and faucet 6 is large, which can reach the starting flow of meter 3. Meter 3 can measure normally, thereby realizing the measurement of dripping water, improving the accuracy of measurement, and avoiding losses to the water supply unit.

[0072] Embodiment 2

[0073] Reference Figure 7 , including all the contents of the first embodiment, the difference is that the high-precision flow metering device also includes an outer shell 30, the controllable valve 2, the meter 3, the pressure sensor 4, and the control module are all located in the outer shell 30, and the digital display screen is arranged on the surface of the outer shell 30. The controllable valve 2, the meter 3, the pressure sensor 4, and the control module are arranged in the outer shell 30 to realize an integrated structural design with a high degree of integration, which is conducive to improving the convenience of installation and use and reducing the overall volume and space occupation.

[0074] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "inner end", "both sides", "inner side", "one end", "the other end", "end", "terminal end", "outer end", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, unless otherwise specified and limited, it should be noted that the term "connection" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the internal connection of two elements, it can be a direct connection, or it can be an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0075] The above are only preferred embodiments of the invention and are not intended to limit the invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the invention should be included in the protection scope of the invention.

Claims

1. High-precision flow metering device, characterized in that: include: A controllable valve (2), a meter (3), a pressure sensor (4), and a buffer (5) are sequentially arranged from the water inlet to the water outlet of the water path. The control module is electrically connected to the meter (3) and can obtain the water consumption according to the measurement of the meter (3). The control module is communicatively connected to the master control platform and can store water charges in advance. The control module is provided with a digital display screen, which displays water charge details and water consumption data. The controllable valve (2) is used to cut off and circulate the waterway, the meter (3) is used to measure the flow of water flowing through the waterway, the pressure sensor (4) is used to detect the pressure in the waterway, and the buffer (5) is used to store energy.

2. The high-precision flow metering device according to claim 1, characterized in that: The controllable valve (2), meter (3), pressure sensor (4), buffer (5), and control module are all located inside the outer shell (31), and the digital display screen is arranged on the surface of the outer shell (31).

3. The high-precision flow metering device according to claim 1, characterized in that: The buffer (5) comprises a buffer shell (7) and a water storage air bag, the buffer shell (7) is provided with a connecting pipe (8), the opening of the water storage air bag is sleeved on the inner end of the connecting pipe (8) on the buffer shell (7), and a clamp is provided on the inner end of the connecting pipe (8).

4. The high-precision flow metering device according to claim 3, characterized in that: The buffer shell (7) comprises an upper buffer shell and a lower buffer shell, and the upper buffer shell and the lower buffer shell are connected via a clamping male head (9) and a clamping female head (10).

5. The high-precision flow metering device according to claim 4, characterized in that: The lower buffer shell is provided with a plurality of snap-fit ​​female heads (10), the snap-fit ​​female heads (10) comprising a female body (11) connected to the lower buffer shell, side spring sheets (12) are provided on both sides of the end of the female body (11), convex bodies (13) are provided on the inner sides of the two side spring sheets (12), a snap-fit ​​hole (14) is provided on the female body (11), the snap-fit ​​male head (9) comprises a male body (15) connected to the upper buffer shell, concave bodies (16) are provided on both sides of the male body (15), an end spring sheet (17) is provided at the end of the male body (15), and a barb (18) is provided at the end of the end spring sheet (17).

6. The high-precision flow metering device according to claim 3, characterized in that: The outer end of the connecting pipe (8) is connected to the waterway through a quick connection mechanism, and the quick connection mechanism comprises a water pipe interface (19) connected to the waterway, and the inner wall of one end of the water pipe interface (19) is provided with a clamping part (20), a diameter expansion part (21) and a sealing part (22) in sequence, the inner diameter of the clamping part (20) is smaller than the inner diameter of the diameter expansion part (21), the inner diameter of the diameter expansion part (21) is larger than the inner diameter of the inner hole of the water pipe interface (19), and the inner diameter of the sealing part (22) is opened. A sealing ring groove is provided, a sealing ring (23) is provided in the sealing ring groove, a movable sleeve (24) is inserted into one end of the water pipe interface (19), a convex edge portion (25) is provided at one end of the movable sleeve (24), a preload spring (26) is sleeved on the movable sleeve (24) between the convex edge portion (25) and the water pipe interface (19), the other end of the movable sleeve (24) is divided into a plurality of elastic sheets (27), and a stopper (28) is provided at the end of the elastic sheet (27); The outer end of the connecting pipe (8) is inserted into the water pipe interface (19), and a stop ring groove (29) is provided on the outer diameter of the outer end of the connecting pipe (8).

7. The measuring method of the high-precision flow metering device according to any one of claims 1 to 6, characterized in that: The water inlet valve (1) is always open, including the normal water metering method: S1, the controllable valve (2) is in the closed state, the faucet (6) is turned on, water in the water path at the rear end of the controllable valve (2) flows out, and the pressure sensor (4) detects the pressure in the water path; S2. When the pressure sensor (4) detects that the pressure in the water channel reaches the set pressure lower limit, the controllable valve (2) opens, water flows out of the water channel normally, and the meter (3) performs metering; S3, after the faucet (6) is closed, when the pressure sensor (4) detects that the pressure in the water circuit has reached the set pressure upper limit, the controllable valve (2) is closed and the meter (3) stops measuring; Also included is a method for measuring the dripping of a faucet (6): S1, the controllable valve (2) and the faucet (6) are all in a closed state. The faucet (6) drips, causing the pressure in the water path between the controllable valve (2) and the faucet (6) to drop. When the pressure sensor (4) detects that the pressure reaches the set pressure lower limit, the controllable valve (2) opens, and water enters the water path between the controllable valve (2) and the faucet (6) from the water inlet end; S2, when the pressure sensor (4) detects that the pressure reaches the set pressure upper limit, the controllable valve (2) is closed; S3. The meter (3) measures the amount of water entering the waterway after the controllable valve (2) is opened.

8. The measuring method of the high-precision flow metering device according to claim 7, characterized in that: The controllable valve (2) in the normal water usage metering method and the faucet (6) dripping metering method both delays closing, and the controllable valve (2) delays closing for 3 seconds.

9. The measuring method of the high-precision flow metering device according to claim 7, characterized in that: The dripping metering method of the faucet (6) is as follows: when the controllable valve (2) is opened, water enters the water path between the controllable valve (2) and the faucet (6) from the water inlet end and fills the buffer (5).

10. The measuring method of the high-precision flow metering device according to claim 7, characterized in that: The normal pressure in the water channel is 0.2 MPa, the upper limit is set to 0.18 MPa, and the lower limit is set to 0.05 MPa.

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