Today I will introduce to you a national invention authorized patent-a water meter calibration system and its calibration method. The patent was applied by Shenzhen Kelu Electronic Technology Co., Ltd. and was authorized to be announced on May 1, 2018.
Description of contentThe invention relates to the field of water meters, in particular to a water meter calibration system and its calibration method.
Background of the inventionAt present, most water meter calibration stations are non-automatic and are manually operated by measurement personnel. They clamp the water meter, open the manual valve and adjust the water flow, close the valve, read the water meter reading, read the reading in the standard container, and calculate the error The problems of manual calibration are labor intensity, low work efficiency, and human error.
Summary of the inventionIn order to solve the problems of the prior art, the present invention provides a water meter calibration system and a calibration method thereof, which are used for automatic water meter calibration to improve the efficiency of calibration.
The figure is a schematic diagram of a specific embodiment of the present invention
The technical scheme adopted by the present invention is: a water meter calibration system, including a water supply unit, a meter unit to be measured, a switch control unit, a switch signal sensing unit, a weighing unit, a main control unit, a temperature measurement unit, and a water measurement unit ; The water supply unit is connected to the meter unit, the meter unit is connected to the weighing unit, the water supply unit, the meter unit, and the weighing unit constitute a meter water circuit; the switch control unit is provided on the meter water circuit Control whether the meter water circuit is connected. The switch signal sensor unit is used to measure whether the meter water circuit is connected. The water measurement unit is used to measure the water flow of the meter unit. The weighing unit is used to weigh the meter. The weight of water in the meter unit; the output of the switch signal sensing unit is connected to the input of the main control unit and the input of the water measurement unit, and the output of the water measurement unit is connected to the input of the main control unit, the main control unit The output of the switch is connected to the input of the switch control unit. The temperature measuring unit is used to measure the temperature of the water in the meter water circuit. The output of the temperature measuring unit is An input terminal connected to the control unit.
The water meter calibration system also includes a pressure measuring unit. The pressure measuring unit is used to measure the pressure of the meter water circuit. The output of the pressure measuring unit is connected to the input of the main control unit. The water supply unit includes a water storage tank, a water pump and a voltage stabilizing tank, the water storage tank is connected to the water pump, the water pump is connected to the voltage stabilizing tank, and the voltage stabilizing tank is connected to the unit under test. The measured meter unit includes a measured meter subunit and a caliber unit. The water supply unit communicates with the measured meter subunit. The measured meter subunit includes at least one measured water meter. The caliber unit includes at least one caliber branch. The caliber branch includes a branch Circuit control valve, metering pipe section and flow meter, the measured meter subunit is connected to the metering pipe section, branch control valve is used to control whether the measured meter subunit is connected to the metering pipe section, and the flow meter is used to measure the flow through the meter The flow of water in the pipe section.
The weighing unit includes a weighing water tank and an electronic scale. The unit under test is connected to the weighing water tank. The electronic scale is used to measure the weight of the weighing water tank. The water measuring unit includes a photoelectric probe and a flow collector. The output end of the photoelectric probe is connected to the input end of the flow collector. The switch signal sensing unit is a position sensor, which is used to measure the switch state of the switch control unit to determine whether the meter water circuit is connected.
Another technical solution adopted by the present invention is: a meter calibration method applied to a water meter calibration system, which includes the following steps: acquiring the calibration meter operation error; acquiring the water flow measurement value, weighing value and water Temperature value, weighing value is the quality of the water flowing through the water meter being measured; the water flow weighing value is obtained according to the weighing value and temperature value; the calibration water value is obtained according to the operating error and water flow weighing value; according to the water flow measurement The value and the meter water value are used to obtain the error of the measured water meter. Further, the method for obtaining the operation error of the calibration meter is to obtain the water flow measurement value and the water flow weighing value of the calibration meter twice in advance, and then obtain the operation error.
The calculation method of the water flow measurement value is: to obtain the flow signal number n; to obtain the water flow measurement value Vs according to the flow signal number, the calculation formula is Vs = n / (2 * A), where A is the number of gear teeth / Liter, that is, the number of gear teeth that the rotating wheel starts to move through a liter of water.
The beneficial effects of the present invention are as follows: A water meter calibration system of the present invention includes a water supply unit, a meter unit under test, a switch control unit, a switch signal sensing unit, a weighing unit, a main control unit, a temperature measurement unit, and a water measurement unit It is used for automatic calibration, improves calibration efficiency, reduces labor intensity, avoids human errors in manual calibration, and guarantees the quality of calibration. In addition, the calibration method of the water meter calibration system of the present invention achieve Automatic meter calibration saves manpower and reduces costs.
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