CN109405937B - Wide-range ratio water meter calibration standard device and water meter calibration method thereof - Google Patents
Wide-range ratio water meter calibration standard device and water meter calibration method thereof Download PDFInfo
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- CN109405937B CN109405937B CN201811600405.3A CN201811600405A CN109405937B CN 109405937 B CN109405937 B CN 109405937B CN 201811600405 A CN201811600405 A CN 201811600405A CN 109405937 B CN109405937 B CN 109405937B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 819
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- 230000002093 peripheral effect Effects 0.000 claims abstract description 13
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- 239000002184 metal Substances 0.000 claims description 72
- 238000009825 accumulation Methods 0.000 claims description 57
- 239000003638 chemical reducing agent Substances 0.000 claims description 56
- 238000007667 floating Methods 0.000 claims description 50
- 238000007789 sealing Methods 0.000 claims description 39
- 230000001360 synchronised effect Effects 0.000 claims description 33
- 238000002955 isolation Methods 0.000 claims description 22
- 230000001133 acceleration Effects 0.000 claims description 11
- 238000012360 testing method Methods 0.000 claims description 10
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 claims description 9
- 230000000087 stabilizing effect Effects 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 5
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims description 3
- 230000002159 abnormal effect Effects 0.000 abstract description 4
- 239000007788 liquid Substances 0.000 description 15
- 230000003068 static effect Effects 0.000 description 15
- 230000007547 defect Effects 0.000 description 4
- 230000001186 cumulative effect Effects 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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- 229910001220 stainless steel Inorganic materials 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
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Abstract
The invention discloses a wide-range ratio water meter calibration standard device for water meter calibration and a water meter calibration method. The wide-range ratio water meter calibration standard device provided by the invention comprises a piston device serving as a main standard device, a peripheral system, a calibrating device, a pressurizing system, a high-level water tank and an exhaust system. The invention not only realizes the verification of the water meter, but also greatly improves the capacity of measuring the lower limit of the verification device by adopting the column disc combined standard, and overcomes the difficulty that the device is difficult to provide the verification of the small flow of the water meter; in addition, the low-flow back pressure system effectively solves the problem of abnormal operation caused by insufficient back pressure during the low-flow verification of the water meter.
Description
Technical Field
The invention relates to a wide-range ratio water meter calibration standard device for water meter calibration and a water meter calibration method.
Background
At present, when the water meter is calibrated, a calibration device is mainly a liquid flow standard device by a static volumetric method or a static mass method. The two types of liquid flow standard devices meet the verification requirement of the water meter to a certain extent, but have obvious defects in use, and are mainly characterized in that: (i) The static volumetric liquid flow standard device has low verification efficiency on the water meter. Since the working volume of a static volumetric liquid flow standard device is typically a calabash-shaped meter with a metering neck. When the device water meter is used for flow verification, the volume in the measuring device can be read only if the liquid reaches the measuring neck. Therefore, when the verification flow is smaller, the verification time is longer, and the verification efficiency is low; (ii) a long flow stabilization time. When the water meter is adjusted from one target flow point to another target flow point, the pressure in the corresponding pipeline changes, the pressure in the pipeline changes to influence the pressure in the pressure stabilizing container, the pressure in the pressure stabilizing container changes to influence the water supply amount of the water pump for the pressure stabilizing container, and the pressure in the pressure stabilizing container can be stabilized in a constant pressure range after long adjustment time is required in the changing process, so that the stability of the flow in the pipeline is ensured, and the verification of the flow of the water meter is realized; (iii) The weighing scale in the liquid flow standard device of the static mass method is easily influenced by environment (such as vibration, temperature, humidity and the like), and the environmental condition is difficult to ensure, particularly the water pump and the pipeline vibrate, so that the weighing scale is easily subjected to zero drift due to the influence of the environment, and the accuracy is difficult to ensure; (iv) The liquid flow standard device of the static volume method or the static mass method has large occupied space, is difficult to move once built, and the liquid flow standard device for verifying the flow of the water meter generally requires compact equipment and small occupied space, so the device is difficult to meet the requirement; (v) The liquid flow standard device of the static volumetric method or the static mass method is not easy to save energy, and once the water pump is started, the device is not stopped even if the water meter is replaced during verification, so that the energy consumption is serious.
The patent number is: ZL 2011 0339915.1, patent name: a water meter calibrating device and a water meter calibrating method are disclosed. Each timing and frequency-counting device of the water meter calibrating device is respectively connected with a corresponding photoelectric sampler and a pulse control circuit of a servo motor; the protection sleeve is fixedly connected with the cylinder body of the hydraulic cylinder, the servo motor is fixed on the protection sleeve, the rotating shaft of the servo motor is fixedly connected with one end of a screw rod through a coupler, the other end of the screw rod is connected with a screw rod nut, and the screw rod nut is connected with one end of a piston of the hydraulic cylinder; the hydraulic cylinder is provided with a cylinder body water inlet and a cylinder body water outlet, the water tank is provided with a water tank water inlet and a water tank water outlet, the cylinder body water inlet is communicated with the water tank water outlet through a first water inlet pipe, and a water outlet pipe is arranged at the cylinder body water outlet; the water inlet of the water tank is provided with a second water inlet pipe, and the first water inlet pipe, the second water inlet pipe and the water outlet pipe are provided with switch valves. The device provided by the invention has the following defects when being used for water meter verification: (i) a wide-range ratio of flow output cannot be achieved. The cylinder body is used as a volume standard, the piston is matched with the cylinder body, water in the cylinder body is discharged out of the cylinder body by the movement of the piston, and the water flows through the water meter to be tested in the water outlet pipe according to a certain flow rate, so that the verification of the water meter to be tested is realized; because the horizontal movement of the piston is converted by the rotation of the servo motor through the cooperation of the screw rod and the screw rod nut, when the flow rate is smaller, the screw rod is required to rotate at a lower angular speed to push the piston to slowly run, and the rotation of the screw rod is driven by the servo motor, the servo motor must rotate at the lower angular speed to provide the lower rotational angular speed for the screw rod, however, the servo motor will generate a creeping phenomenon at the lower rotational speed, so that the whole piston system is unstable to run, and the piston cannot provide the smaller flow rate; therefore, on the premise that the maximum flow rate provided by the piston is constant, the piston can only provide a larger flow rate, but cannot provide a smaller flow rate, so that the ratio of the maximum flow rate to the minimum flow rate provided by the piston is smaller, and therefore, the wide-range ratio cannot be realized. (ii) A low flow condition does not provide sufficient back pressure downstream of the meter under test. When checking the checked water meter, in order to ensure that the checked water meter can work normally, enough back pressure needs to be provided at the downstream of the checked water meter, and when the flow rate is low, the water flow loss in the downstream pipeline of the checked water meter is small, the height of the downstream back pressure pipe is generally not more than 2m (the height of a checking table is generally 1 m) due to the limit of the height of a factory building or a laboratory layer, the back pressure formed by the back pressure pipe at the downstream of the water meter is added with the back pressure formed by the water flow in the downstream pipeline of the checked water meter to overcome the pressure loss of the pipeline, and the back pressure formed at the downstream of the checked water meter is insufficient to provide enough back pressure for the checked water meter, so that the check water meter can not work normally due to the failure of the checked water meter, and difficulty is brought to the check of the checked water meter when the flow rate is low.
The patent number is: ZL 20161 012939.1, patent name: a standard device and a method for checking constant flow valve and differential pressure are disclosed. The stepping motor of the constant flow valve flow and differential pressure calibration standard device is fixed on a speed reducer, a rotating shaft of the stepping motor is connected with an input shaft sleeve of the speed reducer, an output shaft of the speed reducer is fixedly connected with the end part of one end of a screw rod through a coupler, screw rod shaft sleeves are arranged at the rear part of the end part of one end of the screw rod and close to the end part and the other end of the screw rod, a screw nut is arranged on the screw between the screw shaft sleeves, the screw nut is fixed in the middle of the slidable metal support, the lower end of the slidable metal support is connected with the linear guide rail, a floating joint is arranged at the upper part of the slidable metal support, the floating joint is fixedly connected with a cylindrical piston in the hydraulic cylinder, and a Y-shaped sealing ring is arranged between the cylindrical piston and the hydraulic cylinder; the inner side of the linear guide rail is provided with a grating ruler, and a photoelectric reading head of the grating ruler is fixedly connected with the slidable metal support; the hydraulic cylinder is provided with a cylinder body exhaust calibration port, the cylinder body exhaust calibration port is fixedly connected with one end of a manual switch ball valve through a stainless steel pipeline, the other end of the manual switch ball valve is fixedly connected with one end of a back pressure pipe, the other end of the back pressure pipe is fixedly connected with a nozzle, and a water inlet of the hydraulic cylinder is communicated with a water tank through a cylinder body water inlet switch ball valve; the water outlet of the hydraulic cylinder is connected with one end of a cylinder body water outlet switch ball valve, the other end of the cylinder body water outlet switch ball valve is connected with a front straight pipe section through a three-way pipe and a front switch ball valve of a meter clamping device, the other end of the cylinder body water outlet switch ball valve is also connected with an exhaust water pump through a three-way pipe and a rear switch ball valve of the exhaust water pump, and an air outlet of the exhaust water pump is provided with a front switch ball valve of the exhaust water pump; a constant flow valve to be calibrated is arranged between the front straight pipe section and the rear straight pipe section, differential pressure transmitters are connected in parallel at two ends of the constant flow valve, the rear straight pipe section is connected with an indicating flowmeter through an indicating flowmeter front switch ball valve, and the indicating flowmeter is connected to a water tank. And the patent number is: ZL 2011 0339915.1, patent name: the invention patent of a water meter calibrating device and a water meter calibrating method is similar, and when the device is used for verifying the flow and differential pressure of a constant flow valve, the device has the following defects: (i) a wide-range ratio of flow output cannot be achieved. The device only takes the cylindrical piston as a volume standard, adopts the cooperation between the cylindrical piston and the hydraulic cylinder, discharges the water in the hydraulic cylinder from the movement of the cylindrical piston to the hydraulic cylinder, and flows through the constant flow valve in the front straight pipe section and the rear straight pipe section according to a certain flow velocity to realize the flow and differential pressure verification of the constant flow valve to be detected; the horizontal movement of the cylindrical piston is converted by the cooperation of the screw rod and the screw rod nut, when the flow rate is smaller, the screw rod needs to push the cylindrical piston to slowly run at a lower rotation angular speed, and the screw rod is driven by the step motor, so the step motor can provide the screw rod with the lower rotation angular speed, but the step motor can generate a creeping phenomenon at the lower rotation speed, so that the whole piston system is unstable to run, and the piston cannot provide the smaller flow rate; therefore, on the premise that the maximum flow rate provided by the piston is constant, the piston can only provide a larger flow rate, but cannot provide a smaller flow rate, so that the ratio of the maximum flow rate to the minimum flow rate provided by the piston is smaller, and therefore, the wide-range ratio cannot be realized. (ii) A low flow condition does not provide sufficient back pressure downstream of the constant flow valve. When checking the tested constant-current valve, enough back pressure must be provided at the downstream of the tested constant-current valve, and when the flow rate is low, the water flow loss in the downstream pipeline of the tested constant-current valve is small, the height of the downstream back pressure pipe is generally not more than 2m (the height of a checking table is generally 1 m) due to the limit of the height of a factory building or a laboratory, the back pressure formed by the back pressure pipe at the downstream of the constant-current valve is added with the back pressure formed by the water flow in the downstream pipeline of the tested constant-current valve, so that the back pressure formed at the downstream of the tested constant-current valve when overcoming the pressure loss of the pipeline is insufficient to provide enough back pressure for the tested constant-current valve, therefore, when the flow rate is low, the back pressure cannot be provided for the tested constant-current valve, the tested constant-current valve is easy to work abnormally, and the check of the tested constant-current valve is difficult.
In summary, the liquid flow standard device according to the static volumetric method or the static mass method has various defects as follows: ZL 2011 0339915.1, ZL 2016 1 0129739.1, corresponding patent names are respectively: the invention relates to a water meter calibrating device and a water meter calibrating method, and discloses a standard device for constant flow valve flow and differential pressure calibration and a calibration method, which are characterized in that the invention patent of the device is insufficient, so that a novel wide-range-ratio liquid flow standard (or water meter calibration) device is urgently needed to replace the current static volume method, static mass method or patent number as follows: the liquid flow standard devices invented in ZL 2011 0339915.1 and ZL 2016 1 0129739.1.
Disclosure of Invention
The invention aims to provide a column-disk combined wide-range ratio piston type water meter verification device for water meter verification and a method for verifying the water meter by using the device.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the provided wide-range ratio water meter calibration standard device comprises a piston device serving as a main standard device, a peripheral system, a verification device, a pressurizing system, a high-level water tank and an exhaust system. The piston type device as the main standard device and the peripheral system comprise a servo motor, a speed reducer metal support, a coupler, a screw front metal support, a screw, a linear guide rail, a piston metal support, a slidable metal support, a screw nut, a floating joint, a cylindrical piston, a front cylinder water inlet switch ball valve, a front cylinder water inlet pipeline, a front cylinder exhaust pipeline, a front cylinder manual exhaust ball valve, a piston cylinder front flange, a piston cylinder, a front cylinder water outlet pipeline, a front cylinder water outlet switch ball valve, a screw rear metal support, a piston metal support, a disc piston, a piston cylinder rear flange, a rear cylinder manual exhaust ball valve, a rear cylinder exhaust pipeline, a rear cylinder water inlet switch ball valve, a rear cylinder water outlet pipeline, a rear cylinder water outlet switch ball valve, a front and rear cylinder water outlet pipe isolation ball valve and a front cylinder water outlet pipe and rear cylinder water outlet pipe isolation ball valve connecting pipe. The calibrating device comprises a meter clamping device front switch ball valve, a meter clamping device front connecting pipeline, a meter clamping device, a front straight pipe section, a tested water meter electromechanical conversion device, a tested water meter, a rear straight pipe section, a calibrating device supporting frame, a collecting pipe, a small-caliber back pressure switch ball valve, a same-diameter back pressure switch ball valve, a small-caliber back pressure pipeline and a same-diameter back pressure pipeline. The pressurizing system comprises a pressurizing water pump outlet pipeline, a pressurizing water pump rear switch ball valve, a pressurizing water pump front switch ball valve and a pressurizing water pump water inlet pipeline; the water outlet pipe of the pressurized water pump is fixedly connected with the small-caliber back pressure pipeline through a three-way pipe. The exhaust system comprises an exhaust water inlet pipeline, an exhaust water pump front switch ball valve, an exhaust water pump rear switch ball valve and an exhaust water outlet pipeline.
The piston type device and the peripheral system adopt a servo motor as a driving device, the servo motor is fixedly arranged on a speed reducer shell, the speed reducer is fixedly arranged on a speed reducer metal support, the speed reducer metal support is fixedly arranged on a piston metal support, a rotating shaft of the servo motor is connected with an input shaft sleeve of the speed reducer, an output shaft of the speed reducer is fixedly connected with the forefront end of one end of a lead screw through a coupler, a lead screw shaft sleeve is arranged between the end of one end of the lead screw and a screw thread and between the end of the other end of the lead screw and the screw thread, a lead screw nut is arranged on the lead screw between the lead screw shaft sleeves, the lead screw nut is fixed in the middle of a slidable metal support, the lower end of the slidable metal support is connected with a linear guide rail, a floating joint is arranged on the upper part of the slidable metal support, a certain water filling gap is reserved between the floating joint and one end of a cylindrical piston in the piston cylinder, the cylindrical piston is sealed with a front flange of the piston cylinder by adopting a Y-shaped sealing ring, the Y-shaped sealing ring is fixedly arranged on the front flange of the piston cylinder, the front flange is fixedly arranged at the front end of the piston cylinder, and O-shaped sealing ring is sealed between the piston cylinder and the front flange is sealed by adopting O-shaped sealing; the other end of the cylindrical piston is fixedly connected with a disc-shaped piston arranged in the piston cylinder, a Y-shaped sealing ring and a guide ring are arranged between the disc-shaped piston and the piston cylinder, a rear flange of the piston cylinder is fixedly arranged at the rear end of the piston cylinder, an O-shaped sealing ring is adopted for sealing between the piston cylinder and the rear flange of the piston cylinder, and a screw shaft sleeve and the piston cylinder are fixedly arranged on corresponding metal supports respectively; the front flange of the piston cylinder is provided with a front cylinder body exhaust calibration port, a front cylinder body water inlet and a front cylinder body water outlet; the front cylinder body exhaust calibration port is fixedly connected with one end of a front cylinder body manual exhaust ball valve through a front cylinder body exhaust connecting pipeline, the other end of the front cylinder body manual exhaust ball valve is fixedly connected with one end of a front cylinder body exhaust pipeline, the front cylinder body exhaust pipeline is a rigid pipeline with a certain height (a certain distance higher than a horizontal piston cylinder), and the other end of the front cylinder body exhaust pipeline is an inverted U-shaped pipeline with a downward water outlet; the water inlet of the front cylinder body is fixedly connected with one end of a water inlet switch ball valve of the front cylinder body through a water inlet connecting pipeline of the front cylinder body, the other end of the water inlet switch ball valve of the front cylinder body is fixedly connected with one end of a water inlet pipeline of the front cylinder body, and the other end of the water inlet pipeline of the front cylinder body is fixedly connected with a water supply port of the front cylinder body on the high-level water tank; the front cylinder body water outlet is fixedly connected with one end of a front cylinder body water outlet switch ball valve through a front cylinder body water outlet connecting pipeline, the other end of the front cylinder body water outlet switch ball valve is fixedly connected with one end of a front cylinder body water outlet pipeline, the other end of the front cylinder body water outlet pipeline is fixedly connected with one end of a front and rear cylinder body water outlet pipe isolating ball valve, the other end of the front and rear cylinder body water outlet pipe isolating ball valve is fixedly connected with one end of a front and rear cylinder body water outlet pipe isolating ball valve connecting pipe, and the other end of the front and rear cylinder body water outlet pipe isolating ball valve connecting pipe is fixedly connected with a water outlet pipeline of an exhaust water pump through a T-shaped tee; the rear flange of the piston cylinder is provided with a rear cylinder body exhaust calibration port, a rear cylinder body water inlet and a rear cylinder body water outlet; the rear cylinder body exhaust calibration port is fixedly connected with one end of a rear cylinder body manual exhaust ball valve through a rear cylinder body exhaust connecting pipeline, the other end of the rear cylinder body manual exhaust ball valve is fixedly connected with one end of a rear cylinder body exhaust pipe, the rear cylinder body exhaust pipeline is a rigid pipeline with a certain height (a certain distance higher than a piston cylinder (the piston cylinder is a horizontal piston cylinder)), and the other end of the rear cylinder body exhaust pipeline is an inverted U-shaped pipeline with a downward water outlet; the water inlet of the rear cylinder body is fixedly connected with one end of a water inlet switch ball valve of the rear cylinder body through a water inlet connecting pipeline of the rear cylinder body, the other end of the water inlet switch ball valve of the rear cylinder body is fixedly connected with one end of a water inlet pipeline of the rear cylinder body, and the other end of the water inlet pipeline of the rear cylinder body is fixedly connected with a water supply port of the rear cylinder body on the high-level water tank; the water outlet of the rear cylinder body is fixedly connected with one end of a rear cylinder body water outlet switch ball valve through a rear cylinder body water outlet connecting pipeline, the other end of the rear cylinder body water outlet switch ball valve is fixedly connected with one end of a rear cylinder body water outlet pipeline, and the other end of the rear cylinder body water outlet pipeline is fixedly connected with one end of a meter clamping device front switch ball valve. The meter clamping device of the calibrating device is fixedly arranged at the front end of the supporting frame of the calibrating device, the water inlet end of the meter clamping device is fixedly connected with the other end of the meter clamping device front switch ball valve through a meter clamping device front connecting pipeline, the water outlet end of the meter clamping device is connected with one end of a front straight pipe section, the front straight pipe section is connected with the water inlet end of the detected water meter, the water outlet end of the detected water meter is fixedly connected with one end of a rear straight pipe section, the other end of the rear straight pipe section is fixedly connected with one end of a collecting pipe with the same diameter, the other end of the same diameter collecting pipe is fixedly connected with one end of an elbow, the other end of the elbow is fixedly connected with one end of a vertical back pressure connecting pipe with the same diameter, the other end of the same diameter back pressure connecting pipe is fixedly connected with one end of a same diameter back pressure switch ball valve, and the other end of the same diameter back pressure pipe is fixedly connected with a water outlet of the same diameter back pressure pipe on a high-level water tank; the collecting pipe is fixedly arranged at the tail end of the calibrating device supporting frame, a water outlet hole (the inner diameter of the water outlet hole is not more than DN 15) is formed in the vertically upward outer wall of the middle position of the collecting pipe, one end of a small-caliber back pressure connecting pipe with the same inner diameter as the water outlet hole is communicated with the water outlet hole and is fixed on the outer wall of the collecting pipe around the water outlet hole, the other end of the small-caliber back pressure connecting pipe is fixedly connected with one end of a small-caliber back pressure switch ball valve, the other end of the small-caliber back pressure switch ball valve is fixedly connected with one end of the small-caliber back pressure pipe, and the other end of the small-caliber back pressure pipe is fixedly connected with a water outlet of the small-caliber back pressure pipe on the high-level water tank; the middle position of the small-caliber back pressure pipe is provided with a T-shaped tee joint, two pipe orifices opposite to the T-shaped tee joint are fixedly connected with the small-caliber back pressure pipe in series, and the other pipe orifice of the T-shaped tee joint is fixedly connected with the other end of the water outlet pipe of the water pump. The water inlet of the pressurizing water pump of the pressurizing system is fixedly connected with one end of a water inlet connecting pipe of the pressurizing water pump, the other end of the water inlet connecting pipe of the pressurizing water pump is fixedly connected with one end of a front switch ball valve of the pressurizing water pump, the other end of the front switch ball valve of the pressurizing water pump is fixedly connected with one end of a water inlet pipe of the pressurizing water pump, and the other end of the water inlet pipe of the pressurizing water pump is fixedly connected with a water supply port of the pressurizing water pump of the high-level water tank; the water outlet of the pressurized water pump is fixedly connected with one end of a water outlet connecting pipe of the pressurized water pump, the other end of the water outlet connecting pipe of the pressurized water pump is fixedly connected with one end of a rear switch ball valve of the pressurized water pump, the other end of the rear switch ball valve of the pressurized water pump is fixedly connected with one end of a water outlet pipe of the pressurized water pump, and the other end of the water outlet pipe of the pressurized water pump is fixedly connected with the other pipe orifice of the T-shaped tee joint. The high-level water tank is arranged at a position higher than the horizontal piston and is provided with a front cylinder water supply port, a rear cylinder water supply port, a water pump water supply port, a small-caliber back pressure pipe water outlet and a same-diameter back pressure pipe water outlet. The high-level water tank is a square water tank, the net height in the water tank is not lower than 0.7m, the water level height in the water tank is not lower than 0.5m, and the bottom of the high-level water tank is higher than the piston cylinder. One end of an exhaust water inlet pipeline of the exhaust system is fixedly connected with the high-level water tank, a water inlet at one end of the exhaust water inlet pipeline is positioned in the high-level water tank, the other end of the exhaust water inlet pipeline is fixedly connected with one end of an exhaust water pump front switch ball valve, the other end of the exhaust water pump front switch ball valve is fixedly connected with one end of an exhaust water pump front connecting pipeline, the other end of the exhaust water pump front connecting pipeline is fixedly connected with the water inlet of the exhaust water pump, a water outlet of the exhaust water pump rear connecting pipeline is fixedly connected with one end of the exhaust water pump rear switch ball valve, the other end of the exhaust water pump rear switch ball valve is fixedly connected with one end of an exhaust water pump water outlet pipeline, the other end of the exhaust water pump water outlet pipe is fixedly connected with the high-level water tank, and a water outlet at the other end of the exhaust water pump water outlet pipe is positioned in the high-level water tank.
Further, the servo motor is replaced by a stepping motor.
The invention relates to a method for generating back pressure at a rear straight pipe section at the downstream of a detected water meter when the small flow of the water meter is checked by using the water meter checking device, which comprises the following steps and principles:
i) And controlling the rotation speed to be corresponding to the small flow point of the detected water meter to be checked, and starting the front switch ball valve of the pressurized water pump and starting the pressurized water pump.
Ii) under the action of the pressurized water pump, water in the high-level water tank enters the small-caliber back pressure pipeline after passing through the water inlet pipe of the pressurized water pump, the front switch ball valve of the pressurized water pump, the rear switch ball valve of the pressurized water pump and the water outlet pipeline of the pressurized water pump, and finally flows into the high-level water tank from the small-caliber back pressure pipeline.
Iii) When the water flow supplied by the pressurized water pump flows into the high-level water tank through the small-caliber back pressure pipeline, the water flow can quickly generate minimum back pressure exceeding the check time of the checked water meter in the small-caliber back pressure pipeline under the action of the pressure loss of the pipeline, and the back pressure is transmitted to the checked water meter through the rear straight pipe section.
Iv) the starting of the pressurized water pump is synchronous with the reverse acceleration control of the servo motor when the small flow point of the checked water meter is checked, the flow stabilizing time of the water flow supplied by the pressurized water pump and the constant rotating speed time corresponding to the reverse acceleration of the servo motor to the flow point of the checked water meter are shorter, the two times can reach the flow balance point in a short time, namely, the constant and enough back pressure of the small flow check back pressure system to the checked water meter can be established in a short time.
The method for checking the water meter by using the water meter checking device comprises the following steps:
A. verification of large flow points
A) And the water meter to be detected is arranged between the front straight pipe section and the rear straight pipe section.
B) Step 9) is executed, the servo motor is controlled to reversely rotate to drive the speed reducer to rotate in the same direction, the rotation of the servo motor is reduced by the speed reducer to drive the screw rod to reversely rotate, the reverse rotation of the screw rod is converted into reverse horizontal movement of the screw rod nut through the cooperation of the screw rod and the screw rod nut, the reverse horizontal movement of the screw rod nut drives the slidable metal support to reversely synchronously move horizontally, the reverse synchronous horizontal movement of the slidable metal support drives the floating joint to reversely synchronously move horizontally, and the reverse synchronous horizontal movement of the floating joint pulls the cylindrical piston and the disc piston to reversely synchronously move horizontally until the other end of the cylindrical piston and the disc piston reach the top of the piston cylinder.
C) Closing the front and rear cylinder water outlet pipe isolating ball valves and the rear cylinder water outlet switch ball valve; the front switch ball valve of the meter clamping device, the small-caliber back pressure switch ball valve, the back switch ball valve of the same-diameter back pressure switch, the front switch ball valve of the exhaust water pump and the back switch ball valve of the exhaust water pump are opened, and the exhaust water pump is started to remove air in a water outlet pipeline of a rear cylinder body, the front switch ball valve of the meter clamping device, a front connecting pipeline of the meter clamping device, a front straight pipe section, a water meter to be detected, a rear straight pipe section, a collecting pipe, the small-caliber back pressure switch ball valve, the back pressure switch ball valve of the same-diameter back pressure switch, the small-caliber back pressure pipeline, the back pressure pipeline of the same-diameter back pressure pipeline, the exhaust water inlet pipeline, the front switch ball valve of the exhaust water pump and the exhaust water outlet pipeline.
D) Closing the front cylinder body manual exhaust ball valve, the front cylinder body water outlet switch ball valve, the front cylinder body water outlet pipe isolation ball valve, the rear cylinder body manual exhaust ball valve, the rear cylinder body water inlet switch ball valve, the exhaust water pump rear switch ball valve and the small-caliber back pressure switch ball valve; the front cylinder water inlet switch ball valve, the rear cylinder water outlet switch ball valve, the meter clamping device front switch ball valve and the same-diameter back pressure switch ball valve are opened.
E) The servo motor is controlled to positively accelerate to rotate to a rotating speed corresponding to the required checking flow rate and then keeps rotating at a constant speed, meanwhile, the forward rotation of the servo motor is decelerated by a certain reduction ratio of a speed reducer and then drives a screw rod to positively rotate, the rotation of the screw rod is converted into horizontal movement of the cylindrical piston and the disc piston through the cooperation between the screw rod and a screw rod nut, a slidable metal support, a floating joint, the cylindrical piston and the disc piston, on one hand, water in a high-level water tank is sucked into a space between a front flange of a piston cylinder, the cylindrical piston and the disc piston in the piston cylinder through a front cylinder water inlet pipeline and a front cylinder water inlet switch ball valve, and on the other hand, water in the water filling space between a rear flange of the piston cylinder and the disc piston is pushed by the disc piston to be discharged outwards through a rear cylinder water outlet switch ball valve and a rear cylinder water outlet pipeline according to the required checking flow rate, and then enters the high-level water tank through a meter clamp front switch ball valve, a meter clamp, a front straight pipe section, a checked water meter, a rear section, a same-diameter back pressure switch ball valve and a same-diameter back pressure pipeline; after the cylindrical piston and the disc piston correspondingly change from acceleration horizontal movement to uniform horizontal movement, the time-frequency recorder starts to accumulate the frequency for driving the servo motor to rotate, and records the frequency accumulation starting time t 1; after the cylindrical piston and the disc piston correspondingly change from acceleration horizontal movement to uniform horizontal movement, the time-frequency recorder starts to accumulate the frequency signals output by the water meter to be detected, and records the frequency accumulation starting time t' 1; when the accumulation of the frequency signals output by the time-frequency recorder to the detected water meter reaches the minimum frequency signal number, the time-frequency recorder stops the accumulation of the frequency signals output by the detected water meter, and simultaneously records the accumulation stop time t '2 and the accumulation number N' of the frequency signals; after the time-frequency recorder stops accumulating the frequency signals output by the water meter to be detected, the time-frequency recorder then stops accumulating the frequency signals output by the water meter to be detected, and simultaneously records the accumulated stop time t 2 and the accumulated number N of the frequency signals.
F) According to the accumulated number N ' of the frequency signals of the detected water meter recorded by the time frequency recorder, and corresponding accumulated starting time t ' 1 and ending time t ' 2, calculating the average flow of the detected water meter in the frequency signal accumulated time period according to the formula (1):
Q＝(P×N')/(t'2-t'1) (1)
Wherein Q is the average flow rate in a time period for accumulating the frequency signals output by the water meter to be detected; p is the cumulative amount of water represented by each frequency signal as it flows through the meter under test.
G) According to the accumulated number N of the frequency signals of the servo motor recorded by the time frequency recorder, and corresponding accumulated starting time t 1 and ending time t 2, calculating the average flow of the water meter calibration standard device in the accumulated time period of the frequency signals according to the formula (2):
q＝πD2ipωN/[4(t2-t1)] (2)
wherein q is the average flow of the water meter calibration standard device in the frequency signal accumulation time period; pi is the circumference ratio; d is the inner diameter of the piston cylinder; i is the speed ratio of the speed reducer; p is the lead of the lead screw; omega is the angle through which the rotation shaft of the servo motor (1) rotates when the servo motor (1) receives each frequency signal.
H) Calculating according to the formula (3) to obtain the indication error of the checked flow point of the checked water meter (37):
E＝(Q-q)/q×100％ (3)
Wherein E is the error of the indication value of the checked flow point of the checked water meter.
I) Judging whether the servo motor can continuously rotate in the same direction according to the next check flow point of the checked water meter, the check time of the checked water meter and the horizontal running distance of the disc piston: if the same-direction rotation can be continuously carried out, repeating the steps e) to h) to finish the verification of the next flow point; if the same-direction rotation can not be continued, firstly executing the step b), and then executing the step d) to the step h) to finish the verification of the next flow point;
j) And (3) repeatedly executing the step i) to finish the verification of other large flow points of the detected water meter.
B. verification of small flow points
A') judging whether the servo motor can reversely rotate or not according to the small flow check flow point of the detected water meter, the check time of the small flow check flow point and the horizontal running distance of the disc piston: if the reverse rotation can be performed, executing the steps c ') to g'); if the reverse rotation cannot be performed, executing the step b), and then executing the steps c ') to g');
b ') repeating the step a') to finish the verification of other small flow points of the water meter to be detected.
C') closing the front cylinder body manual exhaust ball valve, the front cylinder body water inlet switch ball valve, the rear cylinder body manual exhaust ball valve, the rear cylinder body water outlet switch ball valve, the same-diameter back pressure switch ball valve and the exhaust water pump rear switch ball valve; opening the front cylinder water outlet switch ball valve, the rear cylinder water inlet switch ball valve, the front cylinder water outlet pipe isolation ball valve, the rear cylinder water outlet pipe isolation ball valve, the small-caliber back pressure switch ball valve, the rear switch ball valve of the pressurized water pump and the front switch ball valve of the pressurized water pump;
d') controlling a servo motor to reversely accelerate to rotate at a constant speed after rotating at a rotating speed corresponding to the required checking flow, driving a screw rod to reversely rotate after the reverse rotation of the servo motor is decelerated at a certain reduction ratio by a speed reducer, converting the rotation of the screw rod into horizontal movement of a cylindrical piston and a disc piston through the cooperation between the screw rod and a screw rod nut, a slidable metal support, a floating joint, a cylindrical piston and the disc piston, sucking water in a high-level water tank into a water filling space between a rear flange of a piston cylinder and the disc piston through a rear cylinder water inlet pipeline and a rear cylinder water inlet switch ball valve, and sucking water in the water filling space between a front flange of the piston cylinder and the disc piston through a front cylinder water outlet switch ball valve, a front cylinder water outlet pipeline and a front and rear cylinder water outlet isolation ball valve under the pushing of the disc piston according to the required checking flow, and then entering the high-level water tank through a meter clamping front switch ball valve, a meter front connecting pipeline, a meter clamping device, a front straight pipe section, a tested water meter, a rear straight pipe section, a collecting pipe, a small back pressure switch ball valve and a small caliber pipeline; the method comprises the steps that when a servo motor is controlled to reversely accelerate to rotate, a pressurizing water pump is started, under the action of the pressurizing water pump, water in a high-level water tank enters a small-caliber back pressure pipeline after passing through a pressurizing water pump water inlet pipe, a pressurizing water pump front switch ball valve, a pressurizing water pump rear switch ball valve and a pressurizing water pump water outlet pipeline, and finally flows into the high-level water tank from the small-caliber back pressure pipeline, when water flow supplied by the pressurizing water pump flows into the high-level water tank through the small-caliber back pressure pipeline, the water flow rapidly generates minimum back pressure required by the check of a tested water meter in the small-caliber back pressure pipeline, the back pressure is transmitted to the tested water meter through a rear straight pipe section, and finally, constant minimum back pressure exceeding the required by the tested water meter is rapidly generated in the rear straight pipe section; after a constant minimum back pressure exceeding the requirement of the water meter to be detected is generated in the rear straight pipe section, the time frequency recorder starts to accumulate the frequency for driving the servo motor to rotate, and simultaneously records the frequency accumulation starting time t 1; after the time-frequency recorder starts to accumulate the frequency for driving the servo motor to rotate, the time-frequency recorder starts to accumulate the frequency signal output by the water meter to be detected, and records the frequency accumulation starting time t' 1; when the accumulation of the frequency signals output by the time-frequency recorder to the detected water meter reaches the minimum frequency signal number, the time-frequency recorder stops the accumulation of the frequency signals output by the detected water meter, and simultaneously records the accumulation stop time t '2 and the accumulation number N' of the frequency signals; after the time-frequency recorder stops accumulating the frequency signals output by the detected water meter, the time-frequency recorder then stops accumulating the frequency signals output by the detected water meter, and simultaneously records the accumulated stop time t 2 and the accumulated number N of the frequency signals;
e') performing step f);
f') calculating the average flow of the water meter calibration standard device in the frequency signal accumulation time period according to the formula (4) according to the accumulated number N of the frequency signals of the servo motor (1) recorded by the time frequency recorder and the corresponding accumulated start time t 1 and end time t 2:
q＝πipωN(D2-D1 2)/[4(t2-t1)] (4)
Wherein q is the average flow of the water meter calibration standard device in the frequency signal accumulation time period; pi is the circumference ratio; i is the speed ratio of the speed reducer; p is the lead of the lead screw; omega is the angle rotated by the rotating shaft of the servo motor when the servo motor receives each frequency signal; d is the inner diameter of the piston cylinder; d 1 is the outer diameter of the cylindrical piston.
G') performing step h).
The invention has the beneficial effects that: i) The piston type device with the column disc combined double standard device is used as a main standard device of the water meter checking device: the column piston, the disc piston and the piston cylinder form a column disc combined standard device together, and the column disc combined standard device is used for providing small flow when the water meter is checked; the disc-shaped piston and the piston cylinder together form a disc-shaped standard device for providing large flow rate during water meter verification. Because the water filling space in the column-disc combined type standard device is smaller than the water filling space in the disc-shaped standard device, when the column-shaped piston and the disc-shaped piston move towards the front flange direction of the piston cylinder (called the top of the piston cylinder) for a certain distance, the volume of water in the water filling space compressed and discharged out of the piston cylinder is greatly reduced compared with the volume of water in the water filling space compressed and discharged out of the piston cylinder when the disc-shaped piston moves towards the rear flange direction of the piston cylinder (called the bottom of the piston cylinder (18)) for the same distance, and therefore the column-disc combined type standard device can provide a small flow required during water meter verification. And ii) a low-flow check back pressure system is adopted, so that enough back pressure is generated at the downstream of the water meter to be checked during low-flow check, and the problem of abnormal operation caused by insufficient back pressure during low-flow check of the water meter is effectively solved.
The device and the method for verifying the water meter not only realize the verification of the water meter, but also greatly improve the capacity of measuring the lower limit of the verification device by adopting the column disc combined standard, and overcome the difficulty that the device is difficult to provide the verification of the small flow of the water meter; in addition, the low-flow back pressure system effectively solves the problem of abnormal operation caused by insufficient back pressure during the low-flow verification of the water meter.
Drawings
Fig. 1 is a standard device for water meter verification.
Detailed Description
The invention provides a novel column disc piston type water meter verification device for verifying a water meter by analyzing a plurality of limitations highlighted when the traditional liquid flow standard device based on a static volume method, a static mass method and the existing piston type liquid flow standard device is used for verifying the water meter and combining with the trend of new technology development of the liquid flow standard device, thereby realizing quick verification of the water meter.
The design idea of the invention is as follows: by summarizing the patent numbers: ZL 2011 0339915.1, ZL 2016 1 0129739.1, corresponding patent names are respectively: the invention provides a water meter calibrating device, a water meter calibrating method, a standard device for calibrating flow and differential pressure of a constant flow valve and a calibrating method, and provides a column disc combined standard device, which overcomes the difficulty that the device is difficult to provide small flow calibration of the water meter and improves the capacity of measuring the lower limit flow of the calibrating device. Meanwhile, a low-flow back pressure system is adopted and is used for generating enough back pressure at the downstream of the water meter to be detected during low-flow verification, and the problem of abnormal operation caused by insufficient back pressure during the low-flow verification of the water meter is solved.
As shown in fig. 1, the water meter verification device of the present invention includes a piston type device as a main standard, and a peripheral system, a verification device, a pressurization system, a head tank 50), and an exhaust system. The piston type device as a main standard device and the peripheral system thereof comprise a servo motor 1), a speed reducer 2), a speed reducer metal support 3, a coupler 4), a lead screw front metal support 5), a lead screw 6), a linear guide rail 7), a piston metal support 8), a slidable metal support 9), a lead screw nut 10), a floating joint 11), a cylindrical piston 12), a front cylinder water inlet switch ball valve 13), a front cylinder water inlet pipeline 14, a front cylinder air exhaust pipeline 15), a front cylinder manual air exhaust ball valve 16), a piston cylinder front flange 17), a piston cylinder 18), a front cylinder water outlet pipeline 19), a front cylinder water outlet switch ball valve 20), a lead screw rear metal support 21), a piston metal support 22, a disc piston 23), a piston cylinder rear flange 24), a rear cylinder manual air exhaust ball valve 25), a rear cylinder air exhaust pipeline 26), a rear cylinder water inlet pipeline 27), a rear cylinder water inlet switch ball valve 28), a rear cylinder water outlet switch ball valve 30), a front and rear cylinder water outlet pipe isolation ball valve 31), a front and rear cylinder water outlet pipe isolation ball valve connection pipe 32). The calibrating device comprises a meter clamping front switch ball valve 33), a meter clamping front connecting pipeline 56), a meter clamping 34, a front straight pipe section 35), a tested water meter electromechanical conversion device 36), a tested water meter 37), a rear straight pipe section 38, a calibrating device supporting frame 39), a collecting pipe 40), a small-caliber back pressure switch ball valve 41), a same-diameter back pressure switch ball valve 42), a small-caliber back pressure pipeline 43) and a same-diameter back pressure pipeline 44). The pressurization system comprises a pressurized water pump outlet pipeline 45), a pressurized water pump rear switch ball valve 46), a pressurized water pump 47), a pressurized water pump front switch ball valve 48), and a pressurized water pump inlet pipeline 49); the water outlet pipe 45) of the pressurized water pump is fixedly connected with the small-caliber back pressure pipeline 43) through a tee pipe. The exhaust system includes an exhaust water inlet pipe 51), an exhaust water pump front switch ball valve 52), an exhaust water pump 53), an exhaust water pump rear switch ball valve 54), and an exhaust water outlet pipe 55).
A piston-type device as a master standard, a cylindrical piston 12 in the peripheral system), a piston cylinder front flange 17), a piston cylinder 18), a disc-shaped piston 23) and a piston cylinder rear flange 24) together form a piston-type device of a double standard type. The cylindrical piston 12), the front flange 17 of the piston cylinder, the piston cylinder 18) and the disc-shaped piston 23) together form a cylindrical disc combination type standard device; the front flange 17) of the piston cylinder in the column-disc combined standard is fixedly arranged at the front end of the piston cylinder 18), and the piston cylinder 18) and the front flange 17) of the piston cylinder are sealed by adopting an O-shaped sealing ring; one end of the cylindrical piston 12) is fixedly connected with the floating joint 11), the other end of the cylindrical piston 12) is fixedly connected with the disc-shaped piston 23), the disc-shaped piston 23) is positioned in the piston cylinder 18), and a Y-shaped sealing ring and a guide ring are arranged between the disc-shaped piston 23) and the piston cylinder 18); the cylindrical piston 12) passes through the middle of the front flange 17) of the piston cylinder, one part of the cylindrical piston 12) is positioned outside the piston cylinder 18), the other part of the cylindrical piston is positioned inside the piston cylinder 18), a certain water filling space is reserved between the part of the cylindrical piston 12) positioned inside the piston cylinder 18) and the piston cylinder 18), the cylindrical piston 12) and the front flange 17) of the piston cylinder are sealed by adopting a Y-shaped sealing ring, and the Y-shaped sealing ring is fixedly arranged on the front flange 17) of the piston cylinder; the front end, the middle part and the rear end of the cylindrical piston 12) are respectively supported by a floating joint 11), a piston cylinder front flange 17) and a disc-shaped piston 23); the space between the piston cylinder 18) and the piston cylinder front flange 17), the cylindrical piston 12) and the disc piston 23) is a water filling space, when the piston cylinder is in operation, the cylindrical piston 12) and the disc piston 23) move towards the piston cylinder front flange 17) (called as the top of the piston cylinder 18), the space between the piston cylinder 18) and the piston cylinder front flange 17), the cylindrical piston 12) and the disc piston 23) is reduced, and the space between the cylindrical piston 12) and the piston cylinder front flange 17) and the space between the disc piston 23) and the piston cylinder 18) are sealed by Y-shaped sealing rings, so that water in the water filling space is discharged out of the piston cylinder 18) through a front cylinder outlet pipeline 19) after being compressed, and the volume of water discharged out of the piston cylinder 18) can be calculated according to the outer diameter of the cylindrical piston 12), the inner diameter size of the piston cylinder 18) and the distance of the movement of the cylindrical piston 12) and the piston 23). Piston cylinder 18), disc piston 23), and piston cylinder rear flange 24) together comprise a disc-shaped etalon. The rear flange 24) of the piston cylinder in the disc-shaped standard device is fixedly arranged at the rear end of the piston cylinder 18), and the piston cylinder 18) and the rear flange 24) of the piston cylinder are sealed by adopting an O-shaped sealing ring; disc etalon and post disc combination etalon sharing disc piston 23); the space between the rear flange 24) of the piston cylinder 18) and the disc-shaped piston 23) is a water filling space, when the piston cylinder is in operation, the disc-shaped piston 23) moves towards the rear flange 24) of the piston cylinder (called the bottom of the piston cylinder 18), the space between the rear flange 24) of the piston cylinder 18) and the disc-shaped piston 23) is reduced, and as the space between the disc-shaped piston 23) and the piston cylinder 18) is sealed by adopting Y-shaped sealing rings, water in the water filling space is compressed and then is discharged out of the piston cylinder 18) through a rear cylinder outlet pipeline 29), and the volume of water discharged out of the piston cylinder 18) can be calculated according to the inner diameter size of the piston cylinder 18) and the moving distance of the disc-shaped piston 23).
In addition, the pressurizing system composed of the pressurizing water pump rear switch ball valve 46), the pressurizing water pump 47), the pressurizing water pump front switch ball valve 48) and the pressurizing water pump water inlet pipe 49) and the small-caliber back pressure pipeline 43) and the rear straight pipe section 38) jointly form a small-flow check back pressure system of the water meter check standard device.
A low flow check back pressure system creates back pressure in a rear straight tube section 38) downstream of the meter under test 37), comprising the steps and principles of:
i) Control rotation to a rotation speed corresponding to a small flow point of the water meter 37) to be checked), turn on the on-off ball valve 48 before the pressurized water pump), and start the pressurized water pump 47).
Ii) the water in the head tank 50) enters the small-caliber backpressure pipeline 43) under the action of the pressurized water pump 47) through the pressurized water pump water inlet pipe 49), the pressurized water pump front switch ball valve 48), the pressurized water pump 47), the pressurized water pump rear switch ball valve 46) and the pressurized water pump water outlet pipeline 45), and finally flows into the head tank 50) through the small-caliber backpressure pipeline 43).
Iii) The water supplied by the pressurized water pump 47) flows into the head tank 50) through the small-caliber back pressure pipeline 43), the water flow acts as a pipeline pressure loss, and the minimum back pressure required for checking the water meter 37) to be checked is quickly generated in the small-caliber back pressure pipeline 43), and is transmitted to the water meter 37) through the rear straight pipe section 38).
Iv) the starting of the pressurized water pump 47) is synchronous with the reverse acceleration control of the servo motor 1) when checking the small flow point of the checked water meter 37), and the flow stabilizing time of the water flow supplied by the pressurized water pump 47) and the constant rotating speed time corresponding to the flow point of the checked water meter 37) when the servo motor 1) is reversely accelerated are both shorter, the two can reach the flow balancing point in a short time, namely, the constant and enough back pressure of the small flow check back pressure system to the checked water meter 37) can be established in a short time.
The method for exhausting the piston cylinder of the wide-range ratio water meter calibration standard device comprises the following steps:
1) Closing the front cylinder water inlet switch ball valve 13), the front cylinder water outlet switch ball valve 20), the rear cylinder water inlet switch ball valve 28) and the rear cylinder water outlet switch ball valve 30), opening the front cylinder manual air exhaust ball valve 16) and the rear cylinder manual air exhaust ball valve 25).
2) The servo motor 1) is controlled to reversely rotate to drive the speed reducer 2) to rotate in the same direction, the rotation of the servo motor 1) is reduced by the speed reducer 2) to drive the screw rod 6) to reversely rotate, the reverse rotation of the screw rod is converted into reverse horizontal movement of the screw rod nut 10) through the cooperation of the screw rod 6) and the screw rod nut 10), the reverse horizontal movement of the screw rod nut 10) drives the slidable metal support 9) to reversely synchronously move horizontally, the reverse synchronous horizontal movement of the slidable metal support 9) drives the floating joint 11) to reversely synchronously move horizontally, and the reverse synchronous horizontal movement of the floating joint 11) pulls the cylindrical piston 12) and the disc piston 23) to reversely synchronously move horizontally until the other end of the cylindrical piston 12) and the disc piston 23) reach the top of the piston cylinder 18).
3) Closing the front cylinder manual air discharge ball valve 16), the front cylinder water outlet switch ball valve 20), the rear cylinder water inlet switch ball valve 28) and the rear cylinder water outlet switch ball valve 30), and opening the front cylinder water inlet switch ball valve 13) and the rear cylinder manual air discharge ball valve 25).
4) Controlling the servo motor 1) to rotate forward to drive the speed reducer 2) to rotate in the same direction, driving the screw rod 6) to rotate forward after the rotation of the servo motor 1) is reduced by the speed reducer 2), converting the forward rotation of the screw rod into forward horizontal movement of the screw rod nut 10) through the cooperation of the screw rod 6) and the screw rod nut 10), and driving the slidable metal support 9) to move forward synchronously and horizontally by the forward horizontal movement of the screw rod nut 10), driving the floating joint 11) to move forward synchronously and horizontally by the forward synchronous horizontal movement of the slidable metal support 9), and driving the cylindrical piston 12) and the disc piston 23) to move forward synchronously and horizontally by the forward synchronous horizontal movement of the floating joint 11) until the other end of the cylindrical piston 12) and the disc piston 23) reach the bottom of the piston cylinder 18); during the forward horizontal movement of the cylindrical piston 12) and the disc piston 23), water in the high-level water tank 50) enters the front flange 17) of the piston cylinder positioned in the piston cylinder 18) through the front cylinder water inlet pipeline 14) and the front cylinder water inlet switch ball valve 13), and the space between the cylindrical piston 12) and the disc piston 23) is a water filling space; during forward horizontal movement of the cylindrical piston 12) and the disc piston 23), air located in the space between the piston cylinder 18) and the disc piston 23) is discharged out of the cylinder through the rear cylinder manual air discharge ball valve 25), the rear cylinder air discharge duct 26).
5) Closing the rear cylinder manual exhaust ball valve 25), the rear cylinder water outlet switch ball valve 30), the front cylinder water inlet switch ball valve (13) and the front cylinder water outlet switch ball valve 20), opening the rear cylinder water inlet switch ball valve 28) and the front cylinder manual exhaust ball valve 16).
6) Controlling the servo motor 1) to reversely rotate to drive the speed reducer 2) to rotate in the same direction, driving the screw rod 6) to reversely rotate after the rotation of the servo motor 1) is reduced by the speed reducer 2), converting the reverse rotation of the screw rod into reverse horizontal movement of the screw rod nut 10) through the cooperation of the screw rod 6) and the screw rod nut 10), and driving the slidable metal support 9) to reversely synchronously move horizontally by the reverse horizontal movement of the screw rod nut 10), driving the floating joint 11) to reversely synchronously move horizontally by the reverse horizontal movement of the slidable metal support 9), and pulling the cylindrical piston 12) and the disc piston 23) to reversely synchronously move horizontally by the reverse horizontal movement of the floating joint 11) until the other end of the cylindrical piston 12) and the disc piston 23) reach the top of the piston cylinder 18); during the reverse horizontal movement of the cylindrical piston 12) and the disc piston 23), the water in the high-level water tank 50) enters the water filling space between the rear flange 24) of the piston cylinder 18) and the disc piston 23) through the rear cylinder water inlet pipe 27) and the rear cylinder water inlet switch ball valve 28); during the reverse synchronous horizontal movement of the cylindrical piston 12) and the disc piston 23), the air located in the space between the piston cylinder front flange 17) in the piston cylinder 18), the cylindrical piston 12) and the disc piston 23) is discharged outside the cylinder through the front cylinder manual air discharge ball valve 16) and the front cylinder air discharge pipe 15).
7) Closing the front cylinder manual air-out ball valve 16), the front cylinder water-out switch ball valve 20), the rear cylinder manual air-out ball valve 25) and the rear cylinder water-in switch ball valve 28), and opening the front cylinder water-in switch ball valve 13) and the rear cylinder water-out switch ball valve 30).
8) Controlling the servo motor 1) to rotate forward to drive the speed reducer 2) to rotate in the same direction, driving the screw rod 6) to rotate forward after the rotation of the servo motor 1) is reduced by the speed reducer 2), converting the forward rotation of the screw rod into forward horizontal movement of the screw rod nut 10) through the cooperation of the screw rod 6) and the screw rod nut 10), and driving the slidable metal support 9) to move forward synchronously and horizontally by the forward horizontal movement of the screw rod nut 10), driving the floating joint 11) to move forward synchronously and horizontally by the forward synchronous horizontal movement of the slidable metal support 9), and driving the cylindrical piston 12) and the disc piston 23) to move forward synchronously and horizontally by the forward synchronous horizontal movement of the floating joint 11) until the other end of the cylindrical piston 12) and the disc piston 23) reach the bottom of the piston cylinder 18); in the forward horizontal movement process of the cylindrical piston 12) and the disc-shaped piston 23), water in high-level water (50) enters a piston cylinder front flange 17) positioned in a piston cylinder 18) through a front cylinder water inlet pipeline 14) and a front cylinder water inlet switch ball valve 13), and the space between the cylindrical piston 12) and the disc-shaped piston 23) is a water filling space; during the forward horizontal movement of the cylindrical piston 12) and the disc piston 23), water in the water filling space between the piston cylinder 18) and the rear flange 24) and the disc piston 23) is discharged outwards through the rear cylinder water outlet switch ball valve 30) and the rear cylinder water outlet pipe 29), and air in the rear cylinder water outlet switch ball valve 30) and the rear cylinder water outlet pipe 29) flows out together with the discharged water, so that the air in the rear cylinder water outlet switch ball valve 30) and the rear cylinder water outlet pipe 29) is finally discharged cleanly.
9) Closing the front cylinder manual exhaust ball valve 16), the front cylinder water inlet switch ball valve 13), the rear cylinder water outlet switch ball valve 30) and the rear cylinder manual exhaust ball valve 25), and opening the front cylinder water outlet switch ball valve 20), the front cylinder water outlet pipe isolation ball valve 31) and the rear cylinder water inlet switch ball valve 28).
10 Controlling the servo motor 1) to reversely rotate to drive the speed reducer 2) to rotate in the same direction, driving the screw rod 6) to reversely rotate after the rotation of the servo motor 1) is reduced by the speed reducer 2), converting the reverse rotation of the screw rod into reverse horizontal movement of the screw rod nut 10) through the cooperation of the screw rod 6) and the screw rod nut 10), and driving the slidable metal support 9) to reversely synchronously move horizontally by the reverse horizontal movement of the screw rod nut 10), driving the floating joint 11) to reversely synchronously move horizontally by the reverse horizontal movement of the slidable metal support 9), and pulling the cylindrical piston 12) and the disc piston 23) to reversely synchronously move horizontally by the reverse horizontal movement of the floating joint 11) until the other end of the cylindrical piston 12) and the disc piston 23) reach the top of the piston cylinder 18); during the reverse horizontal movement of the cylindrical piston 12) and the disc piston 23), the water in the high-level water tank 50) enters the water filling space between the rear flange 24) of the piston cylinder 18) and the disc piston 23) through the rear cylinder water inlet pipe 27) and the rear cylinder water inlet switch ball valve 28); in the process of carrying out reverse synchronous horizontal movement on the cylindrical piston 12) and the disc-shaped piston 23), water in the space between the front flange 17) of the piston cylinder in the piston cylinder 18), the cylindrical piston 12) and the disc-shaped piston 23) is discharged outwards through the front cylinder water outlet switch ball valve 20) and the front cylinder water outlet pipeline 19), and meanwhile, air in the front cylinder water outlet switch ball valve 20) and the front cylinder water outlet pipeline 19) flows out together with the discharged water, and finally, the air in the front cylinder water outlet switch ball valve 20), the front cylinder water outlet pipeline 19) and the front and rear cylinder water outlet pipeline isolating ball valves (31) is discharged cleanly.
11 Repeating steps 3), 4), 5), 6) to purge air from the space between the piston cylinder 18) and the rear flange 24) of the piston 18), the disc piston 23), and air from the space between the piston cylinder front flange 17) of the cylinder piston 12) and the disc piston 23) of the piston cylinder 18).
The method for verifying the flow of the water meter by using the wide-range ratio water meter verification standard device comprises the following steps:
A. verification of large flow points
A) The water meter 37) to be inspected is installed between said front straight pipe section 35) and said rear straight pipe section 38).
B) Step 9) is executed, the servo motor 1) is controlled to reversely rotate to drive the speed reducer 2) to rotate in the same direction, the screw rod 6) is driven to reversely rotate after the rotation of the servo motor (1) is reduced by the speed reducer 2), the reverse rotation of the screw rod is converted into the reverse horizontal movement of the screw rod nut 10) through the cooperation of the screw rod 6) and the screw rod nut 10), the reverse horizontal movement of the screw rod nut 10) drives the slidable metal support 9) to reversely synchronously move horizontally, the reverse synchronous horizontal movement of the slidable metal support 9) drives the floating joint 11) to reversely synchronously move horizontally, and the reverse synchronous horizontal movement of the floating joint 11) pulls the cylindrical piston 12) and the disc piston 23) to reversely synchronously move horizontally until the other end of the cylindrical piston 12) and the disc piston 23) reach the top of the piston cylinder 18).
C) Closing the front and rear cylinder water outlet pipe isolating ball valves 31) and the rear cylinder water outlet switch ball valve 30); opening the meter clamping front switch ball valve 33), the small-caliber back pressure switch ball valve 41), the same-diameter back pressure switch ball valve 42), the exhaust water pump front switch ball valve 52) and the exhaust water pump rear switch ball valve 54), and starting the exhaust water pump 53) to remove air in the rear cylinder water outlet pipeline 29), the meter clamping front switch ball valve 33), the meter clamping front connecting pipeline 56), the meter clamping 34), the front straight pipe section 35), the inspected water meter 37), the rear straight pipe section 38), the collecting pipe 40), the small-caliber back pressure switch ball valve 41), the same-diameter back pressure switch ball valve 42), the small-caliber back pressure pipeline 43), the same-diameter back pressure pipeline 44), the exhaust water inlet pipeline 51), the exhaust water pump front switch ball valve 52), the exhaust water pump 53) and the exhaust water outlet pipeline 55).
D) Closing the front cylinder manual exhaust ball valve 16), the front cylinder water outlet switch ball valve 20), the front cylinder water outlet pipe isolation ball valve 31), the rear cylinder manual exhaust ball valve 25), the rear cylinder water inlet switch ball valve 28), the exhaust water pump rear switch ball valve 54), the small-caliber back pressure switch ball valve 41); opening the front cylinder water inlet switch ball valve 13), the rear cylinder water outlet switch ball valve 30), the meter clamping front switch ball valve 33) and the same-diameter back pressure switch ball valve 42).
E) Controlling the servo motor 1) to rotate forward in an accelerating way to a rotating speed corresponding to the required checking flow rate and then keep rotating at a constant speed, simultaneously, driving the screw rod 6) to rotate forward after the forward rotation of the servo motor 1) is decelerated by a certain reduction ratio through the speed reducer 2), converting the rotation of the screw rod 3) into the horizontal movement of the cylindrical piston 12) and the disc piston 23) through the cooperation between the screw rod 3) and the screw rod nut 10) and the movable metal support 9) and the floating joint 11), the cylindrical piston 12) and the disc piston 23), on one hand, sucking water in the high-level water tank 50) into a space between the front flange 17) of the piston cylinder in the piston cylinder 18) and the cylindrical piston 12) and the disc piston 23) through the front cylinder water inlet pipeline 14) and the front cylinder water inlet switch 13) to be a water filling space, on the other hand, water in the water filling space between the piston cylinder rear flange 24) and the disc-shaped piston 23) is pushed by the disc-shaped piston 23) to be discharged outwards through the rear cylinder water outlet switch ball valve 30) and the rear cylinder water outlet pipeline 29) according to the required check flow, and enters the high-level water tank 50 after passing through the meter clamping front switch ball valve 33), the meter clamping front connecting pipeline (56), the meter clamping 34), the front straight pipe section 35), the detected water meter 37), the rear straight pipe section 38), the collecting pipe 40), the same-diameter back pressure switch ball valve 42) and the same-diameter back pressure pipeline 44); after the cylindrical piston 12) and the disc piston 23) are correspondingly changed from the acceleration horizontal movement to the uniform horizontal movement, the time-frequency recorder starts to accumulate the frequency of driving the servo motor 1) to rotate, and records the frequency accumulation start time t 1; after the cylindrical piston 12) and the disc piston 23) are correspondingly changed from the acceleration horizontal movement to the uniform horizontal movement, the time-frequency recorder starts to accumulate the output frequency signals of the detected water meter 37), and records the frequency accumulation starting time t' 1; when the accumulation of the output frequency signals of the detected water meter 37) by the time-frequency recorder reaches the minimum frequency signal number, the time-frequency recorder stops the accumulation of the output frequency signals of the detected water meter 37) and simultaneously records the accumulation stop time t '2 and the accumulation number N' of the frequency signals; after the time-frequency recorder stops accumulating the frequency signal outputted from the water meter under test 37), the time-frequency recorder then stops accumulating the frequency signal outputted from the water meter under test 37), and simultaneously records the accumulation stop time t 2 and the accumulation number N of frequency signals.
F) According to the accumulated number N ' of the frequency signals of the detected water meter 37) recorded by the time frequency recorder and the corresponding accumulated starting time t ' 1 and ending time t ' 2, calculating the average flow rate of the detected water meter 37) in the frequency signal accumulated time period according to the formula (1):
Q＝(P×N')/(t'2-t'1) (1)
Wherein Q is the average flow rate in a period of time in which the frequency signal output from the water meter under test 37) is accumulated; p is the cumulative amount of water represented by each frequency signal when water flows through the subject meter 37).
G) According to the accumulated number N of the frequency signals of the servo motor (1) recorded by the time frequency recorder, and corresponding accumulated starting time t 1 and ending time t 2, calculating the average flow of the water meter calibration standard device in the accumulated time period of the frequency signals according to the formula (2):
q＝πD2ipωN/[4(t2-t1)] (2)
Wherein q is the average flow of the water meter calibration standard device in the frequency signal accumulation time period; pi is the circumference ratio; d is the piston cylinder 18) inner diameter; i is the gear ratio of the speed reducer 2); p is the lead of the lead screw 6); ω is the angle through which the rotation axis of the servo motor 1) rotates when the servo motor 1) receives each frequency signal.
H) Calculating according to formula (3) to obtain the indication error of the checked flow point of the checked water meter 37):
E＝(Q-q)/q×100％ (3)
where E is the inspected water meter 37) is the error in the indication of the inspected flow point.
I) Judging whether the servo motor 1) can continue to rotate in the same direction according to the next check flow point of the checked water meter 37) and the check time thereof and the distance that the disc piston 23) has horizontally operated: if the same-direction rotation can be continuously carried out, repeating the steps e) to h) to finish the verification of the next flow point; if the same-direction rotation can not be continued, firstly executing the step b), and then executing the step d) to the step h) to finish the verification of the next flow point;
j) Repeating the step i) to complete the verification of other large flow points of the detected water meter 37).
B. verification of small flow points
A') judging whether the servo motor 1) can rotate reversely or not according to the small flow check flow point of the checked water meter 37) and the check time thereof and the distance that the disc piston 23) has horizontally run: if the reverse rotation can be performed, executing the steps c ') to g'); if the reverse rotation cannot be performed, executing the step b), and then executing the steps c ') to g');
b ') repeating step a') to complete the verification of other small flow points of the water meter 37) to be tested.
C') closing the front cylinder manual exhaust ball valve 16), the front cylinder water inlet switch ball valve 13), the rear cylinder manual exhaust ball valve 25), the rear cylinder water outlet switch ball valve 30), the same-diameter back pressure switch ball valve 42) and the exhaust water pump rear switch ball valve 54); opening the front cylinder water outlet switch ball valve 20), the rear cylinder water inlet switch ball valve 28), the front cylinder water outlet pipe isolation ball valve 31), the small-caliber back pressure switch ball valve 41), the pressurized water pump rear switch ball valve 46) and the pressurized water pump front switch ball valve 48);
d') controlling the servo motor 1) to reversely accelerate to rotate at a constant speed after corresponding to the required checking flow, simultaneously, driving the screw rod 6) to reversely rotate after the reverse rotation of the servo motor 1) is decelerated by a certain reduction ratio of the speed reducer 2), converting the rotation of the screw rod 3) into the horizontal movement of the cylindrical piston 12) and the disc piston 23) through the cooperation between the screw rod 3) and the screw rod nut 10) and the floating joint 11), the cylindrical piston 12) and the disc piston 23) by the cooperation between the screw rod 3) and the screw rod nut 10), the floating joint 11), the cylindrical piston 12) and the disc piston 23), sucking water in the high-level water tank 50) into a water filling space between the rear flange 24) of the piston cylinder 18) and the ball valve between the cylindrical piston 12) and the disc piston 23) through the rear cylinder water inlet pipe 27) and the rear cylinder water inlet switch 28), on the other hand, the water in the water filling space between the front flange 17) of the piston cylinder, the cylindrical piston 12) and the disc-shaped piston 23) in the piston cylinder 18) is pushed by the disc-shaped piston 23) to be discharged outwards through the front cylinder water outlet switch ball valve 20), the front cylinder water outlet pipeline 19) and the front and rear cylinder water outlet pipe isolating ball valve 31) according to the required check flow, and the water is discharged outwards through the meter clamping front switch ball valve 33), the meter clamping front connecting pipeline 56), the meter clamping 34), the front straight pipe section 35), the inspected water meter 37), the rear straight pipe section 38), the collecting pipe 40), the small-caliber back pressure switch ball valve 41), small caliber backpressure line 43) and then into the head tank 50); the servo motor 1) is controlled to reversely accelerate and rotate, the pressurized water pump 47) is started, under the action of the pressurized water pump 47), water in the high-level water tank 50) enters the small-caliber back pressure pipeline 43) through the pressurized water pump water inlet pipe 49), the pressurized water pump front switch ball valve 48), the pressurized water pump 47), the pressurized water pump rear switch ball valve 46) and the pressurized water pump water outlet pipeline 45) and finally flows into the high-level water tank 50) through the small-caliber back pressure pipeline 43), the water flow quickly generates the minimum back pressure exceeding the check time of the checked water meter 37) in the small-caliber back pressure pipeline 43) and is transmitted to the checked water meter 37 through the rear straight pipe section 38), and finally the constant minimum back pressure exceeding the checked water meter 37) is quickly generated in the rear straight pipe section 38); after a constant minimum back pressure exceeding that required by the water meter under test 37) is generated in the rear straight pipe section 38), the time-frequency recorder starts to accumulate the frequency of driving the servo motor 1) to rotate, and at the same time records the frequency accumulation start time t 1; after the time-frequency recorder starts to accumulate the frequency of driving the servo motor 1) to rotate, the time-frequency recorder starts to accumulate the frequency signal output by the detected water meter 37), and records the frequency accumulation starting time t' 1; when the accumulation of the output frequency signals of the detected water meter 37) by the time-frequency recorder reaches the minimum frequency signal number, the time-frequency recorder stops the accumulation of the output frequency signals of the detected water meter 37) and simultaneously records the accumulation stop time t '2 and the accumulation number N' of the frequency signals; after the time-frequency recorder stops accumulating the output frequency signal of the water meter under test 37), the time-frequency recorder then stops accumulating the output frequency signal of the water meter under test 37), and simultaneously records the accumulation stop time t 2 and the accumulation number N of the frequency signals;
e') performing step f);
f') calculating the average flow of the water meter calibration standard device in the frequency signal accumulation time period according to the formula (4) according to the accumulated number N of the frequency signals of the servo motor 1) recorded by the time frequency recorder and the corresponding accumulated start time t 1 and end time t 2:
q＝πipωN(D2-D1 2)/[4(t2-t1)] (4)
Wherein q is the average flow of the water meter calibration standard device in the frequency signal accumulation time period; pi is the circumference ratio; i is the gear ratio of the speed reducer 2); p is the lead of the lead screw 6); ω is the angle rotated by the rotation axis of the servo motor 1) when the servo motor 1) receives each frequency signal; d is the piston cylinder 18) inner diameter; d 1 is the cylindrical piston 12) outer diameter.
G') performing step h).
Claims (3)
1. A method for generating back pressure in a rear straight pipe section (38) of a downstream of a detected water meter (37) by a low-flow check back pressure system uses a wide-range ratio water meter check standard device, wherein the device comprises a piston device serving as a main standard device, a peripheral system, a verification device, a pressurizing system, a high-level water tank (50) and an exhaust system;
The piston type device as a main standard device and the peripheral system thereof comprise a servo motor (1), a speed reducer (2), a speed reducer metal support (3), a coupler (4), a screw front metal support (5), a screw (6), a linear guide rail (7), a piston metal support (8), a slidable metal support (9), a screw nut (10), a floating joint (11), a cylindrical piston (12), a front cylinder water inlet switch ball valve (13), a front cylinder water inlet pipeline (14), a front cylinder air outlet pipeline (15), a front cylinder manual air outlet ball valve (16), a piston cylinder front flange (17), a piston cylinder (18), a front cylinder water outlet pipeline (19), a front cylinder water outlet switch ball valve (20), a screw rear metal support (21), a piston metal support (22), a disc-shaped piston (23), a piston cylinder rear flange (24), a rear cylinder manual air outlet ball valve (25), a rear cylinder air outlet pipeline (26), a rear cylinder water inlet pipeline (27), a rear cylinder water inlet switch ball valve (28), a rear cylinder water outlet switch ball valve (30), a front cylinder water outlet pipe isolation ball valve (31) and a front cylinder water outlet pipe isolation connecting pipe (32);
the calibrating device comprises a meter clamping front switch ball valve (33), a meter clamping front connecting pipeline (56), a meter clamping device (34), a front straight pipe section (35), a tested water meter electromechanical conversion device (36), a tested water meter (37), a rear straight pipe section (38), a calibrating device supporting frame (39), a collecting pipe (40), a small-caliber back pressure switch ball valve (41), a same-diameter back pressure switch ball valve (42), a small-caliber back pressure pipeline (43) and a same-diameter back pressure pipeline (44);
The pressurizing system comprises a pressurizing water pump outlet pipeline (45), a pressurizing water pump rear switch ball valve (46), a pressurizing water pump (47), a pressurizing water pump front switch ball valve (48) and a pressurizing water pump inlet pipeline (49); the water outlet pipe (45) of the pressurized water pump is fixedly connected with the small-caliber back pressure pipeline (43) through a three-way pipe;
The exhaust system comprises an exhaust water inlet pipeline (51), an exhaust water pump front switch ball valve (52), an exhaust water pump (53), an exhaust water pump rear switch ball valve (54) and an exhaust water outlet pipeline (55);
The cylindrical piston (12), the front flange (17) of the piston cylinder, the piston cylinder (18), the disc-shaped piston (23) and the rear flange (24) of the piston cylinder form a double-standard piston device; the cylindrical piston (12), the front flange (17) of the piston cylinder, the piston cylinder (18) and the disc-shaped piston (23) form a cylindrical disc combination type standard device together; the front flange (17) of the piston cylinder in the column disc combined type standard device is fixedly arranged at the front end of the piston cylinder (18), and an O-shaped sealing ring is adopted for sealing between the piston cylinder (18) and the front flange (17) of the piston cylinder; one end of the cylindrical piston (12) is fixedly connected with the floating joint (11), the other end of the cylindrical piston (12) is fixedly connected with the disc-shaped piston (23), the disc-shaped piston (23) is positioned in the piston cylinder (18), and a Y-shaped sealing ring and a guide ring are arranged between the disc-shaped piston (23) and the piston cylinder (18); the cylindrical piston (12) passes through the middle of the front flange (17) of the piston cylinder, one part of the cylindrical piston is positioned outside the piston cylinder (18), the other part of the cylindrical piston is positioned inside the piston cylinder (18), a certain water filling space is reserved between the part of the cylindrical piston (12) positioned inside the piston cylinder (18) and the piston cylinder (18), the cylindrical piston (12) is sealed with the front flange (17) of the piston cylinder by adopting a Y-shaped sealing ring, and the Y-shaped sealing ring is fixedly arranged on the front flange (17) of the piston cylinder; the front end, the middle part and the rear end of the cylindrical piston (12) are respectively supported by a floating joint (11), a piston cylinder front flange (17) and a disc-shaped piston (23); the space between the piston cylinder (18) and the front flange (17), the cylindrical piston (12) and the disc piston (23) is a water filling space, when the piston cylinder works, the cylindrical piston (12) and the disc piston (23) move towards the direction of the front flange (17), the space between the piston cylinder (18) and the front flange (17), the cylindrical piston (12) and the disc piston (23) is reduced, and as the space between the cylindrical piston (12) and the front flange (17) and the space between the disc piston (23) and the piston cylinder (18) are sealed by adopting Y-shaped sealing rings, water in the water filling space is compressed and then is discharged out of the piston cylinder (18) through a front cylinder body water outlet pipeline (19), and the volume of water discharged out of the piston cylinder (18) can be calculated according to the outer diameter of the cylindrical piston (12), the inner diameter size of the piston cylinder (18) and the moving distance of the cylindrical piston (12) and the disc piston (23); the piston cylinder (18), the disc-shaped piston (23) and the rear flange (24) of the piston cylinder form a disc-shaped standard device together; the rear flange (24) of the piston cylinder in the disc-shaped standard device is fixedly arranged at the rear end of the piston cylinder (18), and the piston cylinder (18) is sealed with the rear flange (24) of the piston cylinder by adopting an O-shaped sealing ring; the disc-shaped etalon and the column disc combined etalon share a disc-shaped piston (23); the space between the rear flange (24) of the piston cylinder and the disc-shaped piston (23) in the piston cylinder (18) is a water filling space, when the piston cylinder works, the disc-shaped piston (23) moves towards the rear flange (24) of the piston cylinder, the space between the rear flange (24) of the piston cylinder and the disc-shaped piston (23) in the piston cylinder (18) is reduced, as the space between the disc-shaped piston (23) and the piston cylinder (18) is sealed by adopting Y-shaped sealing rings, water in the water filling space is compressed and then is discharged out of the piston cylinder (18) through a rear cylinder body water outlet pipeline (29), and the volume of water discharged out of the piston cylinder (18) can be calculated according to the inner diameter size of the piston cylinder (18) and the moving distance of the disc-shaped piston (23);
the pressurizing system consisting of the rear switch ball valve (46), the pressurizing water pump (47), the front switch ball valve (48) and the water inlet pipe (49) of the pressurizing water pump, the small-caliber back pressure pipeline (43) and the rear straight pipe section (38) form a small-flow check back pressure system of the water meter check standard device together;
the method is characterized by comprising the following steps of:
i) The servo motor (1) is controlled to rotate to a rotating speed corresponding to a small flow point of the detected water meter (37) to be checked, and meanwhile, a front switch ball valve (48) of the pressurized water pump is started and the pressurized water pump (47) is started;
ii) under the action of a pressurized water pump (47), water in the high-level water tank (50) enters a small-caliber back pressure pipeline (43) through a pressurized water pump water inlet pipe (49), a pressurized water pump front switch ball valve (48), the pressurized water pump (47), a pressurized water pump rear switch ball valve (46) and a pressurized water pump water outlet pipeline (45) and finally flows into the high-level water tank (50) through the small-caliber back pressure pipeline (43);
iii) When the water flow supplied by the pressurized water pump (47) flows into the high-level water tank (50) through the small-caliber back pressure pipeline (43), the water flow can quickly generate minimum back pressure exceeding the check requirement of the checked water meter (37) in the small-caliber back pressure pipeline (43) under the action of pipeline pressure loss, and the back pressure is transmitted to the checked water meter (37) through the rear straight pipe section (38);
iv) the starting of the pressurized water pump (47) is synchronous with the reverse acceleration control of the servo motor (1) when the small flow point of the checked water meter (37) is checked, the flow stabilizing time of the water flow supplied by the pressurized water pump (47) and the constant rotating speed time corresponding to the reverse acceleration of the servo motor (1) to the flow point of the checked water meter (37) are shorter, the two times can reach the flow balancing point in a short time, namely, the constant and enough back pressure of the small flow check back pressure system to the checked water meter (37) can be realized in a short time.
2. The method for exhausting the piston cylinder of the wide-range ratio water meter calibration standard device comprises a piston device serving as a main standard device, a peripheral system, a verification device, a pressurizing system, a high-level water tank (50) and an exhaust system;
The piston type device as a main standard device and the peripheral system thereof comprise a servo motor (1), a speed reducer (2), a speed reducer metal support (3), a coupler (4), a screw front metal support (5), a screw (6), a linear guide rail (7), a piston metal support (8), a slidable metal support (9), a screw nut (10), a floating joint (11), a cylindrical piston (12), a front cylinder water inlet switch ball valve (13), a front cylinder water inlet pipeline (14), a front cylinder air outlet pipeline (15), a front cylinder manual air outlet ball valve (16), a piston cylinder front flange (17), a piston cylinder (18), a front cylinder water outlet pipeline (19), a front cylinder water outlet switch ball valve (20), a screw rear metal support (21), a piston metal support (22), a disc-shaped piston (23), a piston cylinder rear flange (24), a rear cylinder manual air outlet ball valve (25), a rear cylinder air outlet pipeline (26), a rear cylinder water inlet pipeline (27), a rear cylinder water inlet switch ball valve (28), a rear cylinder water outlet switch ball valve (30), a front cylinder water outlet pipe isolation ball valve (31) and a front cylinder water outlet pipe isolation connecting pipe (32);
the calibrating device comprises a meter clamping front switch ball valve (33), a meter clamping front connecting pipeline (56), a meter clamping device (34), a front straight pipe section (35), a tested water meter electromechanical conversion device (36), a tested water meter (37), a rear straight pipe section (38), a calibrating device supporting frame (39), a collecting pipe (40), a small-caliber back pressure switch ball valve (41), a same-diameter back pressure switch ball valve (42), a small-caliber back pressure pipeline (43) and a same-diameter back pressure pipeline (44);
The pressurizing system comprises a pressurizing water pump outlet pipeline (45), a pressurizing water pump rear switch ball valve (46), a pressurizing water pump (47), a pressurizing water pump front switch ball valve (48) and a pressurizing water pump inlet pipeline (49); the water outlet pipe (45) of the pressurized water pump is fixedly connected with the small-caliber back pressure pipeline (43) through a three-way pipe;
The exhaust system comprises an exhaust water inlet pipeline (51), an exhaust water pump front switch ball valve (52), an exhaust water pump (53), an exhaust water pump rear switch ball valve (54) and an exhaust water outlet pipeline (55);
The cylindrical piston (12), the front flange (17) of the piston cylinder, the piston cylinder (18), the disc-shaped piston (23) and the rear flange (24) of the piston cylinder form a double-standard piston device; the cylindrical piston (12), the front flange (17) of the piston cylinder, the piston cylinder (18) and the disc-shaped piston (23) form a cylindrical disc combination type standard device together; the front flange (17) of the piston cylinder in the column disc combined type standard device is fixedly arranged at the front end of the piston cylinder (18), and an O-shaped sealing ring is adopted for sealing between the piston cylinder (18) and the front flange (17) of the piston cylinder; one end of the cylindrical piston (12) is fixedly connected with the floating joint (11), the other end of the cylindrical piston (12) is fixedly connected with the disc-shaped piston (23), the disc-shaped piston (23) is positioned in the piston cylinder (18), and a Y-shaped sealing ring and a guide ring are arranged between the disc-shaped piston (23) and the piston cylinder (18); the cylindrical piston (12) passes through the middle of the front flange (17) of the piston cylinder, one part of the cylindrical piston is positioned outside the piston cylinder (18), the other part of the cylindrical piston is positioned inside the piston cylinder (18), a certain water filling space is reserved between the part of the cylindrical piston (12) positioned inside the piston cylinder (18) and the piston cylinder (18), the cylindrical piston (12) is sealed with the front flange (17) of the piston cylinder by adopting a Y-shaped sealing ring, and the Y-shaped sealing ring is fixedly arranged on the front flange (17) of the piston cylinder; the front end, the middle part and the rear end of the cylindrical piston (12) are respectively supported by a floating joint (11), a piston cylinder front flange (17) and a disc-shaped piston (23); the space between the piston cylinder (18) and the front flange (17), the cylindrical piston (12) and the disc piston (23) is a water filling space, when the piston cylinder works, the cylindrical piston (12) and the disc piston (23) move towards the direction of the front flange (17), the space between the piston cylinder (18) and the front flange (17), the cylindrical piston (12) and the disc piston (23) is reduced, and as the space between the cylindrical piston (12) and the front flange (17) and the space between the disc piston (23) and the piston cylinder (18) are sealed by adopting Y-shaped sealing rings, water in the water filling space is compressed and then is discharged out of the piston cylinder (18) through a front cylinder body water outlet pipeline (19), and the volume of water discharged out of the piston cylinder (18) can be calculated according to the outer diameter of the cylindrical piston (12), the inner diameter size of the piston cylinder (18) and the moving distance of the cylindrical piston (12) and the disc piston (23); the piston cylinder (18), the disc-shaped piston (23) and the rear flange (24) of the piston cylinder form a disc-shaped standard device together; the rear flange (24) of the piston cylinder in the disc-shaped standard device is fixedly arranged at the rear end of the piston cylinder (18), and the piston cylinder (18) is sealed with the rear flange (24) of the piston cylinder by adopting an O-shaped sealing ring; the disc-shaped etalon and the column disc combined etalon share a disc-shaped piston (23); the space between the rear flange (24) of the piston cylinder and the disc-shaped piston (23) in the piston cylinder (18) is a water filling space, when the piston cylinder works, the disc-shaped piston (23) moves towards the rear flange (24) of the piston cylinder, the space between the rear flange (24) of the piston cylinder and the disc-shaped piston (23) in the piston cylinder (18) is reduced, as the space between the disc-shaped piston (23) and the piston cylinder (18) is sealed by adopting Y-shaped sealing rings, water in the water filling space is compressed and then is discharged out of the piston cylinder (18) through a rear cylinder body water outlet pipeline (29), and the volume of water discharged out of the piston cylinder (18) can be calculated according to the inner diameter size of the piston cylinder (18) and the moving distance of the disc-shaped piston (23);
the method is characterized by comprising the following steps of:
1) Closing the front cylinder water inlet switch ball valve (13), the front cylinder water outlet switch ball valve (20), the rear cylinder water inlet switch ball valve (28) and the rear cylinder water outlet switch ball valve (30), and opening the front cylinder manual exhaust ball valve (16) and the rear cylinder manual exhaust ball valve (25);
2) The servo motor (1) is controlled to reversely rotate to drive the speed reducer (2) to rotate in the same direction, the rotation of the servo motor (1) is reduced by the speed reducer (2) and then drives the screw rod (6) to reversely rotate, the reverse rotation of the screw rod is converted into reverse horizontal movement of the screw rod nut (10) through the cooperation of the screw rod (6) and the screw rod nut (10), the reverse horizontal movement of the screw rod nut (10) drives the slidable metal support (9) to reversely synchronously move horizontally, the reverse synchronous horizontal movement of the slidable metal support (9) drives the floating joint (11) to reversely synchronously move horizontally, and the reverse synchronous horizontal movement of the floating joint (11) pulls the cylindrical piston (12) and the disc piston (23) to reversely synchronously move horizontally until the other end of the cylindrical piston (12) and the disc piston (23) reach the top of the piston cylinder (18);
3) Closing the front cylinder body manual exhaust ball valve (16), the front cylinder body water outlet switch ball valve (20), the rear cylinder body water inlet switch ball valve (28) and the rear cylinder body water outlet switch ball valve (30), and opening the front cylinder body water inlet switch ball valve (13) and the rear cylinder body manual exhaust ball valve (25);
4) The servo motor (1) is controlled to rotate positively to drive the speed reducer (2) to rotate in the same direction, the rotation of the servo motor (1) is decelerated by the speed reducer (2) to drive the screw rod (6) to rotate positively, the positive rotation of the screw rod is converted into the positive horizontal movement of the screw rod nut (10) through the cooperation of the screw rod (6) and the screw rod nut (10), the positive horizontal movement of the screw rod nut (10) drives the slidable metal support (9) to perform the positive synchronous horizontal movement, the positive synchronous horizontal movement of the slidable metal support (9) drives the floating joint (11) to perform the positive synchronous horizontal movement, and the positive synchronous horizontal movement of the floating joint (11) pushes the cylindrical piston (12) and the disc-shaped piston (23) to perform the positive synchronous horizontal movement until the other end of the cylindrical piston (12) and the disc-shaped piston (23) reach the bottom of the piston cylinder (18); in the forward horizontal movement process of the cylindrical piston (12) and the disc-shaped piston (23), water in the high-level water tank (50) enters a space between the front flange (17) of the piston cylinder in the piston cylinder (18), the cylindrical piston (12) and the disc-shaped piston (23) through the front cylinder water inlet pipeline (14) and the front cylinder water inlet switch ball valve (13) to form a water filling space; during the forward horizontal movement of the cylindrical piston (12) and the disc-shaped piston (23), air in the space between the rear flange (24) of the piston cylinder (18) and the disc-shaped piston (23) is discharged out of the cylinder body through the rear cylinder body manual exhaust ball valve (25) and the rear cylinder body exhaust pipeline (26);
5) Closing the rear cylinder body manual exhaust ball valve (25), the rear cylinder body water outlet switch ball valve (30), the front cylinder body water inlet switch ball valve (13) and the front cylinder body water outlet switch ball valve (20), and opening the rear cylinder body water inlet switch ball valve (28) and the front cylinder body manual exhaust ball valve (16);
6) The servo motor (1) is controlled to reversely rotate to drive the speed reducer (2) to rotate in the same direction, the rotation of the servo motor (1) is reduced by the speed reducer (2) and then drives the screw rod (6) to reversely rotate, the reverse rotation of the screw rod is converted into reverse horizontal movement of the screw rod nut (10) through the cooperation of the screw rod (6) and the screw rod nut (10), the reverse horizontal movement of the screw rod nut (10) drives the slidable metal support (9) to reversely synchronously move horizontally, the reverse synchronous horizontal movement of the slidable metal support (9) drives the floating joint (11) to reversely synchronously move horizontally, and the reverse synchronous horizontal movement of the floating joint (11) pulls the cylindrical piston (12) and the disc piston (23) to reversely synchronously move horizontally until the other end of the cylindrical piston (12) and the disc piston (23) reach the top of the piston cylinder (18); in the process of performing reverse horizontal movement on the cylindrical piston (12) and the disc-shaped piston (23), water in the high-level water tank (50) enters a water filling space between the rear flange (24) of the piston cylinder (18) and the disc-shaped piston (23) through a rear cylinder water inlet pipeline (27) and a rear cylinder water inlet switch ball valve (28); in the process of reversely and synchronously horizontally moving the cylindrical piston (12) and the disc-shaped piston (23), air in the space between the front flange (17) of the piston cylinder in the piston cylinder (18), the cylindrical piston (12) and the disc-shaped piston (23) is discharged out of the cylinder body through the front cylinder body manual exhaust ball valve (16) and the front cylinder body exhaust pipeline (15);
7) Closing the front cylinder body manual exhaust ball valve (16), the front cylinder body water outlet switch ball valve (20), the rear cylinder body manual exhaust ball valve (25) and the rear cylinder body water inlet switch ball valve (28), and opening the front cylinder body water inlet switch ball valve (13) and the rear cylinder body water outlet switch ball valve (30);
8) The servo motor (1) is controlled to rotate positively to drive the speed reducer (2) to rotate in the same direction, the rotation of the servo motor (1) is decelerated by the speed reducer (2) to drive the screw rod (6) to rotate positively, the positive rotation of the screw rod is converted into the positive horizontal movement of the screw rod nut (10) through the cooperation of the screw rod (6) and the screw rod nut (10), the positive horizontal movement of the screw rod nut (10) drives the slidable metal support (9) to perform the positive synchronous horizontal movement, the positive synchronous horizontal movement of the slidable metal support (9) drives the floating joint (11) to perform the positive synchronous horizontal movement, and the positive synchronous horizontal movement of the floating joint (11) pushes the cylindrical piston (12) and the disc-shaped piston (23) to perform the positive synchronous horizontal movement until the other end of the cylindrical piston (12) and the disc-shaped piston (23) reach the bottom of the piston cylinder (18); in the forward horizontal movement process of the cylindrical piston (12) and the disc-shaped piston (23), water in the high-level water tank (50) enters a space between the front flange (17) of the piston cylinder in the piston cylinder (18), the cylindrical piston (12) and the disc-shaped piston (23) through the front cylinder water inlet pipeline (14) and the front cylinder water inlet switch ball valve (13) to form a water filling space; in the forward horizontal movement process of the cylindrical piston (12) and the disc-shaped piston (23), water in a water filling space between the rear flange (24) of the piston cylinder (18) and the disc-shaped piston (23) is discharged outwards through the rear cylinder body water outlet switch ball valve (30) and the rear cylinder body water outlet pipeline (29), and meanwhile, air in the rear cylinder body water outlet switch ball valve (30) and the rear cylinder body water outlet pipeline (29) flows out together with the discharged water, and finally, the air in the rear cylinder body water outlet switch ball valve (30) and the rear cylinder body water outlet pipeline (29) is discharged completely;
9) Closing the front cylinder body manual exhaust ball valve (16), the front cylinder body water inlet switch ball valve (13), the rear cylinder body water outlet switch ball valve (30) and the rear cylinder body manual exhaust ball valve (25), and opening the front cylinder body water outlet switch ball valve (20), the front cylinder body water outlet pipe isolation ball valve (31) and the rear cylinder body water inlet switch ball valve (28);
10 The servo motor (1) is controlled to reversely rotate to drive the speed reducer (2) to rotate in the same direction, the rotation of the servo motor (1) is reduced by the speed reducer (2) and then drives the screw rod (6) to reversely rotate, the reverse rotation of the screw rod is converted into reverse horizontal movement of the screw rod nut (10) through the cooperation of the screw rod (6) and the screw rod nut (10), the reverse horizontal movement of the screw rod nut (10) drives the slidable metal support (9) to reversely synchronously move horizontally, the reverse synchronous horizontal movement of the slidable metal support (9) drives the floating joint (11) to reversely synchronously move horizontally, and the reverse synchronous horizontal movement of the floating joint (11) pulls the cylindrical piston (12) and the disc piston (23) to reversely synchronously move horizontally until the other end of the cylindrical piston (12) and the disc piston (23) reach the top of the piston cylinder (18); in the process of performing reverse horizontal movement on the cylindrical piston (12) and the disc-shaped piston (23), water in the high-level water tank (50) enters a water filling space between the rear flange (24) of the piston cylinder (18) and the disc-shaped piston (23) through a rear cylinder water inlet pipeline (27) and a rear cylinder water inlet switch ball valve (28); in the process of reversely and synchronously horizontally moving the cylindrical piston (12) and the disc-shaped piston (23), water in the space among the front flange (17) of the piston cylinder in the piston cylinder (18), the cylindrical piston (12) and the disc-shaped piston (23) is discharged outwards through the front cylinder water outlet switch ball valve (20) and the front cylinder water outlet pipeline (19), and meanwhile, air in the front cylinder water outlet switch ball valve (20) and the front cylinder water outlet pipeline (19) flows out together with the discharged water, and finally, the air in the front cylinder water outlet switch ball valve (20), the front cylinder water outlet pipeline (19) and the front cylinder water outlet pipeline isolation ball valve (31) is discharged cleanly;
11 Repeating steps 3), 4), 5), 6), the air in the space between the rear flange (24) of the piston cylinder (18) and the disc-shaped piston (23) in the piston cylinder (18) and the air in the space between the front flange (17) of the piston cylinder, the cylindrical piston (12) and the disc-shaped piston (23) in the piston cylinder (18) are removed.
3. A method for flow verification of a water meter using a wide range ratio meter verification standard device, said wide range ratio meter verification standard device comprising a piston device as a master standard and a peripheral system, a verification device, a pressurization system, a high level water tank (50) and an exhaust system;
The piston type device as a main standard device and the peripheral system thereof comprise a servo motor (1), a speed reducer (2), a speed reducer metal support (3), a coupler (4), a screw front metal support (5), a screw (6), a linear guide rail (7), a piston metal support (8), a slidable metal support (9), a screw nut (10), a floating joint (11), a cylindrical piston (12), a front cylinder water inlet switch ball valve (13), a front cylinder water inlet pipeline (14), a front cylinder air outlet pipeline (15), a front cylinder manual air outlet ball valve (16), a piston cylinder front flange (17), a piston cylinder (18), a front cylinder water outlet pipeline (19), a front cylinder water outlet switch ball valve (20), a screw rear metal support (21), a piston metal support (22), a disc-shaped piston (23), a piston cylinder rear flange (24), a rear cylinder manual air outlet ball valve (25), a rear cylinder air outlet pipeline (26), a rear cylinder water inlet pipeline (27), a rear cylinder water inlet switch ball valve (28), a rear cylinder water outlet switch ball valve (30), a front cylinder water outlet pipe isolation ball valve (31) and a front cylinder water outlet pipe isolation connecting pipe (32);
the calibrating device comprises a meter clamping front switch ball valve (33), a meter clamping front connecting pipeline (56), a meter clamping device (34), a front straight pipe section (35), a tested water meter electromechanical conversion device (36), a tested water meter (37), a rear straight pipe section (38), a calibrating device supporting frame (39), a collecting pipe (40), a small-caliber back pressure switch ball valve (41), a same-diameter back pressure switch ball valve (42), a small-caliber back pressure pipeline (43) and a same-diameter back pressure pipeline (44);
The pressurizing system comprises a pressurizing water pump outlet pipeline (45), a pressurizing water pump rear switch ball valve (46), a pressurizing water pump (47), a pressurizing water pump front switch ball valve (48) and a pressurizing water pump inlet pipeline (49); the water outlet pipe (45) of the pressurized water pump is fixedly connected with the small-caliber back pressure pipeline (43) through a three-way pipe;
The exhaust system comprises an exhaust water inlet pipeline (51), an exhaust water pump front switch ball valve (52), an exhaust water pump (53), an exhaust water pump rear switch ball valve (54) and an exhaust water outlet pipeline (55);
The cylindrical piston (12), the front flange (17) of the piston cylinder, the piston cylinder (18), the disc-shaped piston (23) and the rear flange (24) of the piston cylinder form a double-standard piston device; the cylindrical piston (12), the front flange (17) of the piston cylinder, the piston cylinder (18) and the disc-shaped piston (23) form a cylindrical disc combination type standard device together; the front flange (17) of the piston cylinder in the column disc combined type standard device is fixedly arranged at the front end of the piston cylinder (18), and an O-shaped sealing ring is adopted for sealing between the piston cylinder (18) and the front flange (17) of the piston cylinder; one end of the cylindrical piston (12) is fixedly connected with the floating joint (11), the other end of the cylindrical piston (12) is fixedly connected with the disc-shaped piston (23), the disc-shaped piston (23) is positioned in the piston cylinder (18), and a Y-shaped sealing ring and a guide ring are arranged between the disc-shaped piston (23) and the piston cylinder (18); the cylindrical piston (12) passes through the middle of the front flange (17) of the piston cylinder, one part of the cylindrical piston is positioned outside the piston cylinder (18), the other part of the cylindrical piston is positioned inside the piston cylinder (18), a certain water filling space is reserved between the part of the cylindrical piston (12) positioned inside the piston cylinder (18) and the piston cylinder (18), the cylindrical piston (12) is sealed with the front flange (17) of the piston cylinder by adopting a Y-shaped sealing ring, and the Y-shaped sealing ring is fixedly arranged on the front flange (17) of the piston cylinder; the front end, the middle part and the rear end of the cylindrical piston (12) are respectively supported by a floating joint (11), a piston cylinder front flange (17) and a disc-shaped piston (23); the space between the piston cylinder (18) and the front flange (17), the cylindrical piston (12) and the disc piston (23) is a water filling space, when the piston cylinder works, the cylindrical piston (12) and the disc piston (23) move towards the direction of the front flange (17), the space between the piston cylinder (18) and the front flange (17), the cylindrical piston (12) and the disc piston (23) is reduced, and as the space between the cylindrical piston (12) and the front flange (17) and the space between the disc piston (23) and the piston cylinder (18) are sealed by adopting Y-shaped sealing rings, water in the water filling space is compressed and then is discharged out of the piston cylinder (18) through a front cylinder body water outlet pipeline (19), and the volume of water discharged out of the piston cylinder (18) can be calculated according to the outer diameter of the cylindrical piston (12), the inner diameter size of the piston cylinder (18) and the moving distance of the cylindrical piston (12) and the disc piston (23); the piston cylinder (18), the disc-shaped piston (23) and the rear flange (24) of the piston cylinder form a disc-shaped standard device together; the rear flange (24) of the piston cylinder in the disc-shaped standard device is fixedly arranged at the rear end of the piston cylinder (18), and the piston cylinder (18) is sealed with the rear flange (24) of the piston cylinder by adopting an O-shaped sealing ring; the disc-shaped etalon and the column disc combined etalon share a disc-shaped piston (23); the space between the rear flange (24) of the piston cylinder and the disc-shaped piston (23) in the piston cylinder (18) is a water filling space, when the piston cylinder works, the disc-shaped piston (23) moves towards the rear flange (24) of the piston cylinder, the space between the rear flange (24) of the piston cylinder and the disc-shaped piston (23) in the piston cylinder (18) is reduced, as the space between the disc-shaped piston (23) and the piston cylinder (18) is sealed by adopting Y-shaped sealing rings, water in the water filling space is compressed and then is discharged out of the piston cylinder (18) through a rear cylinder body water outlet pipeline (29), and the volume of water discharged out of the piston cylinder (18) can be calculated according to the inner diameter size of the piston cylinder (18) and the moving distance of the disc-shaped piston (23);
the method is characterized by comprising the following steps of:
A. verification of large flow points
A) The water meter (37) to be detected is arranged between the front straight pipe section (35) and the rear straight pipe section (38);
b) The servo motor (1) is controlled to reversely rotate to drive the speed reducer (2) to rotate in the same direction, the rotation of the servo motor (1) is reduced by the speed reducer (2) and then drives the screw rod (6) to reversely rotate, the reverse rotation of the screw rod is converted into reverse horizontal movement of the screw rod nut (10) through the cooperation of the screw rod (6) and the screw rod nut (10), the reverse horizontal movement of the screw rod nut (10) drives the slidable metal support (9) to reversely synchronously move horizontally, the reverse synchronous horizontal movement of the slidable metal support (9) drives the floating joint (11) to reversely synchronously move horizontally, and the reverse synchronous horizontal movement of the floating joint (11) pulls the cylindrical piston (12) and the disc piston (23) to reversely synchronously move horizontally until the other end of the cylindrical piston (12) and the disc piston (23) reach the top of the piston cylinder (18);
c) Closing the front and rear cylinder water outlet pipe isolating ball valves (31) and the rear cylinder water outlet switch ball valve (30); opening the meter clamping front switch ball valve (33), the small-caliber back pressure switch ball valve (41), the same-diameter back pressure switch ball valve (42), the exhaust water pump front switch ball valve (52) and the exhaust water pump rear switch ball valve (54), and starting the exhaust water pump (53) to remove air in the rear cylinder body water outlet pipeline (29), the meter clamping front switch ball valve (33), the meter clamping front connecting pipeline (56), the meter clamping device (34), the front straight pipe section (35), the tested water meter (37), the rear straight pipe section (38), the collecting pipe (40), the small-caliber back pressure switch ball valve (41), the same-diameter back pressure switch ball valve (42), the small-caliber back pressure pipeline (43), the same-diameter back pressure pipeline (44), the exhaust water inlet pipeline (51), the exhaust water pump front switch ball valve (52), the exhaust water pump (53) and the exhaust water outlet pipeline (55);
d) Closing the front cylinder body manual exhaust ball valve (16), the front cylinder body water outlet switch ball valve (20), the front cylinder body water outlet pipe isolation ball valve (31), the rear cylinder body manual exhaust ball valve (25), the rear cylinder body water inlet switch ball valve (28), the exhaust water pump rear switch ball valve (54) and the small-caliber back pressure switch ball valve (41); the front cylinder body water inlet switch ball valve (13), the rear cylinder body water outlet switch ball valve (30), the meter clamping device front switch ball valve (33) and the same-diameter back pressure switch ball valve (42) are opened;
e) The servo motor (1) is controlled to positively accelerate to rotate at a constant speed after rotating at a rotating speed corresponding to a required check flow, meanwhile, the forward rotation of the servo motor (1) is decelerated by a certain reduction ratio through a speed reducer (2) and then drives a screw rod (6) to positively rotate, the screw rod (3) is converted into horizontal movement of the cylindrical piston (12) and the disc-shaped piston (23) through cooperation between the screw rod (3) and a screw rod nut (10), a slidable metal support (9), a floating joint (11), the cylindrical piston (12) and the disc-shaped piston (23), on the one hand, the water in a high-level water tank (50) is sucked into a water filling space between a front flange (17) of a piston cylinder (18), the cylindrical piston (12) and the disc-shaped piston (23) through a front cylinder water inlet pipeline (14) and a front cylinder water inlet switch ball valve (13), on the other hand, the water in the space between the piston cylinder rear flange (24), the cylindrical piston (23) is pushed by the disc-shaped piston (23) is discharged out of the water tank (34) through the required check valve (30), the front clamp meter (34) and the front clamp meter (33) through the front water tank water inlet pipeline (30) and the front clamp meter ball valve (34) and the front clamp meter water inlet valve (33) on the other hand, the device comprises a front straight pipe section (35), a detected water meter (37), a rear straight pipe section (38), a collecting pipe (40), a common-path back pressure switch ball valve (42) and a common-path back pressure pipeline (44), and then enters a high-level water tank (50); after the cylindrical piston (12) and the disc piston (23) correspondingly change from acceleration horizontal movement to uniform horizontal movement, the time-frequency recorder starts to accumulate the frequency for driving the servo motor (1) to rotate, and records the frequency accumulation starting time t 1; after the cylindrical piston (12) and the disc piston (23) correspondingly change from acceleration horizontal movement to uniform horizontal movement, the time-frequency recorder starts to accumulate the output frequency signals of the detected water meter (37) and records the frequency accumulation starting time t' 1; when the accumulation of the frequency signals output by the time-frequency recorder to the detected water meter (37) reaches the minimum frequency signal number, the time-frequency recorder stops the accumulation of the frequency signals output by the detected water meter (37) and records the accumulation stop time t '2 and the accumulation number N' of the frequency signals; after stopping the accumulation of the output frequency signals of the detected water meter (37), the time-frequency recorder then stops the accumulation of the output frequency signals of the servo motor (1) and simultaneously records the accumulation stop time t 2 and the accumulation number N of the frequency signals;
f) According to the accumulated number N ' of the frequency signals of the detected water meter (37) recorded by the time frequency recorder, and corresponding accumulated starting time t ' 1 and ending time t ' 2, calculating the average flow of the detected water meter (37) in the frequency signal accumulated time period according to the formula (1):
Q＝(P×N')/(t'2- t'1) (1)
Wherein Q is the average flow rate in a time period in which the frequency signals output by the water meter (37) to be detected are accumulated; p is the accumulated amount of water represented by each frequency signal when water flows through the water meter (37) under test;
g) According to the accumulated number N of the frequency signals of the servo motor (1) recorded by the time frequency recorder, and corresponding accumulated starting time t 1 and ending time t 2, calculating the average flow of the water meter calibration standard device in the accumulated time period of the frequency signals according to the formula (2):
q＝πD2ipωN/[4(t2- t1)] (2)
wherein q is the average flow of the water meter calibration standard device in the frequency signal accumulation time period; pi is the circumference ratio; d is the inner diameter of the piston cylinder (18); i is the speed ratio of the speed reducer (2); p is the lead of the lead screw (6); omega is the angle rotated by the rotating shaft of the servo motor (1) when the servo motor (1) receives each frequency signal;
h) Calculating according to the formula (3) to obtain the indication error of the checked flow point of the checked water meter (37):
E＝(Q-q)/q×100％ (3)
wherein E is the indication error of the checked flow point of the checked water meter (37);
i) Judging whether the servo motor (1) can continuously rotate in the same direction according to the next check flow point of the detected water meter (37), the check time of the next check flow point and the distance of the horizontal running of the disc-shaped piston (23): if the same-direction rotation can be continuously carried out, repeating the steps e) to h) to finish the verification of the next flow point; if the same-direction rotation can not be continued, firstly executing the step b), and then executing the step d) to the step h) to finish the verification of the next flow point;
j) Repeatedly executing the step i) to finish the verification of other large flow points of the detected water meter (37);
B. verification of small flow points
A') judging whether the servo motor (1) can rotate reversely according to the small flow check flow point of the detected water meter (37) and the check time thereof and the distance of the horizontal running of the disc-shaped piston (23): if the reverse rotation can be performed, executing the steps c ') to g'); if the reverse rotation cannot be performed, executing the step b), and then executing the steps c ') to g');
b ') repeating the step a') to complete the verification of other small flow points of the water meter (37) to be detected;
c') closing the front cylinder body manual exhaust ball valve (16), the front cylinder body water inlet switch ball valve (13), the rear cylinder body manual exhaust ball valve (25), the rear cylinder body water outlet switch ball valve (30), the same-diameter back pressure switch ball valve (42) and the exhaust water pump rear switch ball valve (54); the front cylinder body water outlet switch ball valve (20), the rear cylinder body water inlet switch ball valve (28), the front cylinder body water outlet pipe isolation ball valve (31), the small-caliber back pressure switch ball valve (41), the pressurized water pump rear switch ball valve (46) and the pressurized water pump front switch ball valve (48) are opened;
d') controlling the servo motor (1) to reversely accelerate to rotate to a rotating speed corresponding to the required checking flow, keeping constant speed rotation, simultaneously driving the screw rod (6) to reversely rotate after the reverse rotation of the servo motor (1) is decelerated by a certain reduction ratio of the speed reducer (2), converting the rotation of the screw rod (3) into the horizontal movement of the cylindrical piston (12) and the disc piston (23) through the cooperation between the screw rod (3) and the screw rod nut (10), the slidable metal support (9), the floating joint (11), the cylindrical piston (12) and the disc piston (23), horizontal movement of the cylindrical piston (12) and the disc-shaped piston (23) sucks water in a high-level water tank (50) into a water filling space between a rear flange (24) of a piston cylinder (18) and the disc-shaped piston (23) through a rear cylinder water inlet pipeline (27) and a rear cylinder water inlet switch ball valve (28), and on the other hand, water in the water filling space between a front flange (17) of the piston cylinder (18) in the piston cylinder, the cylindrical piston (12) and the disc-shaped piston (23) is pushed by the disc-shaped piston (23) to be discharged outwards through a front cylinder water outlet switch ball valve (20), a front cylinder water outlet pipeline (19) and a front cylinder water outlet pipe isolation ball valve (31) according to required check flow rates and discharged outwards through a meter clamping front switch ball valve (33), the meter clamping device comprises a meter clamping device front connecting pipeline (56), a meter clamping device (34), a front straight pipe section (35), a tested water meter (37), a rear straight pipe section (38), a collecting pipe (40), a small-caliber back pressure switch ball valve (41) and a small-caliber back pressure pipeline (43), and then enters a high-level water tank (50); the servo motor (1) is controlled to reversely accelerate to rotate, meanwhile, the pressurizing water pump (47) is started, under the action of the pressurizing water pump (47), water in the high-level water tank (50) enters the small-caliber backpressure pipeline (43) through the pressurizing water pump water inlet pipe (49), the pressurizing water pump front switch ball valve (48), the pressurizing water pump (47), the pressurizing water pump rear switch ball valve (46) and the pressurizing water pump water outlet pipe (45), and finally flows into the high-level water tank (50) through the small-caliber backpressure pipeline (43), when water flow supplied by the pressurizing water pump (47) flows into the high-level water tank (50) through the small-caliber backpressure pipeline (43), the water flow quickly generates minimum backpressure required by the check of the tested water meter (37) in the small-caliber backpressure pipeline (43), the backpressure is transmitted to the tested water meter (37) through the rear straight pipe section (38), and finally the water flow quickly generates constant minimum backpressure required by the tested water meter (37) in the rear straight pipe section (38); after a constant minimum back pressure exceeding the required minimum back pressure of the water meter (37) to be detected is generated in the rear straight pipe section (38), the time frequency recorder starts to accumulate the frequency for driving the servo motor (1) to rotate, and simultaneously records the frequency accumulation starting time t 1; after the time-frequency recorder starts to accumulate the frequency for driving the servo motor (1) to rotate, the time-frequency recorder starts to accumulate the frequency signal output by the detected water meter (37) and records the frequency accumulation starting time t' 1; when the accumulation of the frequency signals output by the time-frequency recorder to the detected water meter (37) reaches the minimum frequency signal number, the time-frequency recorder stops the accumulation of the frequency signals output by the detected water meter (37) and records the accumulation stop time t '2 and the accumulation number N' of the frequency signals; after stopping the accumulation of the output frequency signals of the detected water meter (37), the time-frequency recorder stops the accumulation of the output frequency signals of the servo motor (1) and records the accumulation stop time t 2 and the accumulation number N of the frequency signals;
e') performing step f);
f') calculating the average flow of the water meter calibration standard device in the frequency signal accumulation time period according to the formula (4) according to the accumulated number N of the frequency signals of the servo motor (1) recorded by the time frequency recorder and the corresponding accumulated start time t 1 and end time t 2:
q＝πipωN (D2-D1 2)/[4(t2- t1)] (4)
Wherein q is the average flow of the water meter calibration standard device in the frequency signal accumulation time period; pi is the circumference ratio; i is the speed ratio of the speed reducer (2); p is the lead of the lead screw (6); omega is the angle rotated by the rotating shaft of the servo motor (1) when the servo motor (1) receives each frequency signal; d is the inner diameter of the piston cylinder (18); d 1 is the outer diameter of the cylindrical piston (12);
g') performing step h).
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