阅读说明：本技术 一种智能气体腰轮流量计及其使用方法 (Intelligent gas waist wheel flowmeter and use method thereof ) 是由 王庆顺 于 2019-10-09 设计创作，主要内容包括：本发明属于流量计技术领域,尤其为一种智能气体腰轮流量计及其使用方法,包括气体腰轮流量计,所述气体腰轮流量计的下侧安设有流量传感器,所述流量传感器的下侧安设有压力传感器,所述压力传感器的下侧安设有温度传感器,所述温度传感器的下侧安设有智能流量积算仪,通过设置的压力传感器、温度传感器、流量传感器全部内置,使结构更加紧凑,数字压力温度传感器,数字温度传感器和数字压力传感器配置,单独校准与检定,更换、维护和使用方便,分段修正,按流量频率信号,可将仪表系数分六段自动进行线性修正,提高仪表的宽范围精度,完整数据存储功能,采用E2PROM数据存储芯片,保存用户参数、厂家参数,及时的数据保存功能。(The invention belongs to the technical field of flowmeters, in particular to an intelligent gas roots flowmeter and a using method thereof, the intelligent gas roots flowmeter comprises a gas roots flowmeter, a flow sensor is arranged at the lower side of the gas roots flowmeter, a pressure sensor is arranged at the lower side of the flow sensor, a temperature sensor is arranged at the lower side of the pressure sensor, an intelligent flow integrating instrument is arranged at the lower side of the temperature sensor, the structure is more compact by arranging the pressure sensor, the temperature sensor and the flow sensor in a built-in manner, the digital pressure temperature sensor, the digital temperature sensor and the digital pressure sensor are configured, the independent calibration and verification are convenient to replace, maintain and use, the sectional correction can automatically perform linear correction on an instrument coefficient in six sections according to flow frequency signals, the wide-range precision of the instrument and the complete data storage function are improved, and an E2PROM data storage chip is adopted to store user parameters and manufacturer parameters, and a data storage function is performed timely.)

1. An intelligent gas waist wheel flowmeter and a use method thereof are characterized in that: including gaseous roots flowmeter (1), flow sensor (2) have been installed to the downside of gaseous roots flowmeter (1), pressure sensor (3) have been installed to the downside of flow sensor (2), temperature sensor (4) have been installed to the downside of pressure sensor (3), intelligent flow integrating instrument (5) have been installed to the downside of temperature sensor (4).

2. The intelligent gas roots flowmeter and method of use thereof of claim 1, wherein: the gas waist wheel flowmeter (1) comprises a shell, conjugated rotors, an intelligent flow integrating instrument (5), a working power supply, a working condition pulse output mode, RS485 communication and GPRS communication, wherein the number of the conjugated rotors is two, and the conjugated rotors are arranged in a metering chamber.

3. The intelligent gas roots flowmeter and method of use thereof of claim 1, wherein: the intelligent flow totalizer (5) comprises a temperature and pressure detection device, a flow sensor and a microprocessor unit.

4. An intelligent gas roots meter and method of use thereof, as claimed in claim 1 or 2, wherein: the working power supply comprises an internal power supply and an external power supply.

5. An intelligent gas roots meter and method of use thereof, as claimed in claim 1 or 2, wherein: the working condition pulse output mode comprises a working condition pulse signal.

6. An intelligent gas roots meter and method of use thereof, as claimed in claim 1 or 2, wherein: and the RS485 communication interface can be connected with a personal computer, a PLC and other hosts to carry out serial communication.

7. An intelligent gas roots meter and method of use thereof, as claimed in claim 1 or 2, wherein: the GPRS communication performs serial communication.

Technical Field

The invention belongs to the technical field of flowmeters, and particularly relates to an intelligent gas roots flowmeter and a using method thereof.

Background

The flowmeter is known by its english name flowmeter, which is defined by the national committee for the examination and determination of scientific and technical terms as: meters that indicate the measured flow rate and/or the total amount of fluid in a selected time interval. Simply a meter for measuring the flow of fluid in a pipe or open channel.

The flow meters are classified into differential pressure type flow meters, rotor flow meters, throttle type flow meters, slit flow meters, volumetric flow meters, electromagnetic flow meters, ultrasonic flow meters, and the like. Classifying according to media: liquid flow meters and gas flow meters.

The gas waist wheel flowmeter is a volumetric meter for measuring the flow of gas medium in closed pipeline. The gas waist wheel flowmeter has been used as a volumetric metering instrument for over one hundred years, has the characteristics of high precision, wide range of measurement, small volume, light weight, convenient installation and maintenance, reliable use, durable service life and the like, is widely applied to the flow metering of natural gas, coal gas, inert gas, air and other gases, and is an ideal flow metering device for departments of domestic and foreign urban gas, oil field chemical industry, scientific research and the like. The energy sources include primary energy sources (coal, crude oil, coal bed gas, petroleum gas and natural gas), secondary energy sources (electric power, coke, artificial gas, finished oil, liquefied petroleum gas and steam), energy-carrying working media (compressed air, oxygen, nitrogen, hydrogen and water) and the like. Energy metering is an important means for scientifically managing energy, realizing energy conservation and consumption reduction and improving economic benefits. The flow meter is an important component of an energy meter, and water, artificial gas, natural gas, steam and oil which are commonly used energy sources use extremely large-quantity flow meters which are indispensable tools for energy management and economic accounting. The inlet and outlet packing materials are removed when the flowmeter is installed, granular impurities are prevented from falling into the metering chamber, if the metering chamber is coated with anti-rust oil, the metering chamber can be washed clean by gasoline or kerosene, and magazines in pipelines are strictly cleared, and the flowmeter is provided with a filter and a filter screen to prevent rust slag, welding slag and other impurities from entering the metering chamber. When the flowmeter is installed, the material inlet and the material outlet are vertical or horizontal, and the rotor axis is kept horizontal as much as possible. When the gas pressure fluctuation range is large, a pressure regulator is arranged on the upstream of the flowmeter to ensure the metering precision. In order to prevent rust slag, welding slag and other impurities in a newly installed pipeline from entering the flowmeter, a user needs to install the transition pipe on the installation position of the flowmeter, ventilate for a period of time, and ensure that the flowmeter is suffered after no large-particle magazines exist. If the pipeline is welded, a transition pipe is used and cannot be directly welded with the flowmeter. The flowmeter is installed in two modes, namely an inlet and an outlet are vertically installed and an inlet and an outlet are horizontally installed. It is strongly recommended to mount the flowmeter vertically, and the gas flow direction is up-in and down-out, and the rotor in such mounting has self-cleaning capability to the impurities in the pipeline, so as to reduce maintenance, improve service life and ensure metering accuracy. In special cases, the horizontal installation can be adopted, and a front door valve, a rear door valve and a bypass pipeline are arranged for installing the flow meter so as to ensure that the air does not need to be stopped during maintenance. The sizes of distribution pipes and pipe fittings of each part of a pipeline for installing the flowmeter must be proper, the flow meter is installed, the center of the flowmeter is ensured to be aligned with the center of the pipeline without dislocation, and the flowmeter body bears abnormal external force. After the installation is finished, the back cover can be unscrewed, the rotor is rotated by an inner hexagonal wrench, and whether the rotor freely rotates or not is checked. If the rotor rotates and is blocked, the instrument is disassembled to remove dirt. Then reinstalling, and screwing the screw plug after the rotor freely rotates. After the flowmeter is correctly installed, special lubricating oil is injected into the oil window central line from the oil injection buckle, and the lubricating oil is periodically or irregularly checked in the using process to ensure the sufficient cleanness degree of the lubricating oil. If the lubricating oil is found to be blackened or the oil level is higher than the central line of the oil window in use, the lubricating oil is proved to be deteriorated or have impurities, and the lubricating oil is replaced by new lubricating oil. If the oil level is lower than the oil window central line by 3MM, the lubricating oil loss is indicated, and the lubricating oil needs to be supplemented to the oil window central line. When the lubricating oil is filled, the front valve and the rear valve of the flowmeter must be closed, and after the gas in the flowmeter is emptied, the lubricating oil is filled. When the flowmeter is put into operation, the bypass valve and the outlet valve of the flowmeter are opened firstly, the inlet valve is opened slowly, the flowmeter operates for a few minutes under a small flow rate, whether abnormal sound exists or not is heard, after the flowmeter is started normally, the bypass valve is closed gradually, the outlet valve is adjusted to a certain opening degree, and the flowmeter operates normally under a certain flow rate. After the flowmeter is put into operation for a period of time, if the pressure drop of the filter is increased, the filter is cleaned or the filter medium is replaced; if the pressure drop of the flowmeter is increased and the starting flow is increased, the metering chamber can be flushed by clean gasoline or gas.

Compared with the prior art the problem that exists:

the existing gas waist wheel flowmeter has low reliability.

Disclosure of Invention

To solve the problems set forth in the background art described above. The invention provides an intelligent gas roots flowmeter and a using method thereof, and has the characteristics that the gas roots flowmeter is a gas monitoring device with high precision, high reliability and wide range.

In order to achieve the purpose, the invention provides the following technical scheme: the intelligent gas roots flowmeter comprises a gas roots flowmeter body, wherein a flow sensor is installed on the lower side of the gas roots flowmeter body, a pressure sensor is installed on the lower side of the flow sensor body, a temperature sensor is installed on the lower side of the pressure sensor body, and an intelligent flow integrating instrument is installed on the lower side of the temperature sensor body.

Preferably, the gas roots flowmeter comprises a shell, two conjugate rotors, an intelligent flow integrating instrument, a working power supply, a working condition pulse output mode, RS485 communication and GPRS communication, wherein the two conjugate rotors are arranged in a metering chamber; under the action of pressure difference of an inlet and an outlet of the circulating gas, the rotors are kept at correct relative positions through the precisely processed adjusting gears, and optimal working gaps are kept among the rotors, between the rotors and the shell, between the rotors and the wall plate, so that continuous non-contact sealing is realized, and gas with four times of effective volume of the metering chamber is output when the rotors rotate for one circle.

Preferably, the intelligent flow totalizer comprises a temperature and pressure detector, a flow sensor and a microprocessor unit; and a microprocessor in the intelligent flow integrating instrument performs temperature and pressure compensation according to a gas equation and performs compression factor correction.

Preferably, the working power supply comprises an internal power supply and an external power supply; and the internal power supply comprises 1 section of 3.6VDC lithium battery, the battery can normally work when the voltage is 3.1V-3.6V, when the voltage is lower than 3.1V, the battery is required to be replaced, the external power supply comprises +/-24 VDC +/-15%, the ripple wave is less than or equal to +/-5%, and the power supply is suitable for 4-20 mA output, pulse output and RS-485 output.

Preferably, the working condition pulse output mode comprises a working condition pulse signal; directly amplifying and outputting a working condition pulse signal detected by a flow sensor through optical coupling isolation, wherein the high level is more than or equal to 20V, and the low level is less than or equal to 1V; the frequency signal in direct proportion to the standard volume flow is amplified and output by optical coupling isolation, the high level is more than or equal to 20V, and the low level is less than or equal to 1V; the method comprises the steps of calibrating pulse signals, outputting amplitude of 0-3V, outputting pulse width of 500ms, wherein the pulses are mainly used for IC card control devices or other equipment for metering urban gas, and 1m3 of the signals outputs 1 pulse.

Preferably, the RS485 communication interface can be connected with a personal computer, a PLC and other hosts to carry out serial communication; media pressure, temperature, instantaneous flow, cumulative standard flow, battery voltage, etc. may be displayed.

Preferably, the GPRS communication is serial communication; the remote meter reading system can be realized, and medium pressure, temperature, instantaneous flow, accumulated standard flow, battery voltage and the like can be displayed.

Compared with the prior art, the invention has the beneficial effects that: the pressure sensor, the temperature sensor and the flow sensor are all arranged in the intelligent flow meter, so that the structure is more compact, the digital pressure temperature sensor, the digital temperature sensor and the digital pressure sensor are configured, the digital temperature sensor and the digital pressure sensor are independently calibrated and verified, the digital temperature sensor and the digital pressure sensor are convenient to replace, maintain and use, and are corrected in sections, the meter coefficient can be automatically linearly corrected in six sections according to flow frequency signals, the wide-range precision of the meter is improved, the function of storing data is complete, an E2PROM data storage chip is adopted, user parameters and manufacturer parameters are stored, the function of storing data in time can be realized, the data loss during sudden power failure can be prevented, the internal parameters can be permanently stored in a power failure state, the basic output is complete, and the intelligent flow meter is provided with basic meter pulse output. The system comprises an RS485 interface, a 4-20 mA standard analog signal can be output according to the needs of a user, data tracing management and a real-time database, and can be inquired and analyzed through the RS-485 communication interface, and a GPRS real-time management system.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the gas inlet structure in the working state of the present invention;

FIG. 3 is a schematic view of a gas ejecting structure in a working state of the present invention;

FIG. 4 is a schematic view of a gas passing metering structure in an operating state of the present invention;

FIG. 5 is a schematic structural diagram of the present invention in which the rotor rotates one revolution to discharge the gas of the same volume;

in the figure: 1. a gas roots flowmeter; 2. a flow sensor; 3. a pressure sensor; 4. a temperature sensor; 5. intelligent flow totalizer.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.