CN213543742U

CN213543742U - Gas flow standard device for optimizing by linkage of double bell jars

Info

Publication number: CN213543742U
Application number: CN202022815346.0U
Authority: CN
Inventors: 冯嘉明; 刘宜仔; 陈汉松; 赖森豪; 吴霆烽; 李思聪
Original assignee: GUANGZHOU ENERGY DETECTION RESEARCH INSTITUTE
Current assignee: GUANGZHOU ENERGY DETECTION RESEARCH INSTITUTE
Priority date: 2020-11-30
Filing date: 2020-11-30
Publication date: 2021-06-25
Anticipated expiration: 2030-11-30

Abstract

The utility model discloses a linkage double bell jar carries out gas flow standard device who optimizes, including first bell jar, second bell jar and adjusting valve, wherein, the capacity of first bell jar is greater than the capacity of second bell jar, first bell jar passes through the air inlet of pipe connection by the gas flowmeter, first bell jar is equipped with adjusting valve with the pipeline between the gas flowmeter air inlet by the gas flowmeter, the gas outlet of by the gas flowmeter passes through the pipe connection second bell jar, first bell jar is as the air supply, first bell jar descends the gas and passes through adjusting valve and by the gas flowmeter in proper order, the back gets into the second bell jar and makes the second bell jar rise. The utility model discloses can examine and determine gas flowmeter high-efficiently reliably.

Description

Gas flow standard device for optimizing by linkage of double bell jars

Technical Field

The utility model relates to a gas flowmeter examination technical field, in particular to linkage double bell jar carries out the gas flow standard device who optimizes.

Background

The standard calibrating device for calibrating the gas flowmeter by using the bell jar in the industry mainly comprises the following 2 types: (1) air inlet type bell standard device. The device comprises air compressor machine, surge tank, cooler, thermostated container, pneumatics box, stopwatch, bell jar device, connecting line, need start air compressor machine, cooler in advance, make the air through the pipeline after the compression constant temperature, the instrument of being examined, get into inside the bell jar, operating personnel measures the calibrator indicating value, examination time, air pressure gauge indicating value, instrument indicating value, calculates through a series of computational formula and reachs error numerical value. (2) Vented bell standard. The device comprises a bell jar, a stopwatch, a temperature sensor, an air compression box, a switch valve, an adjusting valve, a connecting pipeline and the like, and in the experimental process, an operator needs to measure the value indicated by a standard device, the measurement time, the pressure in the bell jar, the temperature in the bell jar and the temperature at an instrument, record the instrument value in the detection process, and process by using a formula to obtain error data.

Although the exhaust type bell standard device has the advantages of stable air source, low input cost, simple operation and high efficiency, the exhaust type bell standard device can only be used for detecting small-flow or low-pressure flowmeters, and if the small-flow is met, because of the problem of division values, the exhaust type bell standard device can consume a long time and easily improve the uncertainty caused by artificial introduction, so that the experimental data are inaccurate. The air inlet type bell jar standard device can be used for verification experiments of large-flow and high-pressure flow meters, the defects of an exhaust type device are overcome, but the air inlet type bell jar standard device has the defects of high equipment investment cost, low verification efficiency and high single-person operation difficulty, and the problems that the flow is not stable yet and the bell jar rises to the highest point and needs to be exhausted again are easily encountered. It can be seen that the two existing verification devices have disadvantages, and therefore, there is a need to develop a new device that can overcome the disadvantages of the existing devices.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art's shortcoming and not enough, provide a linkage two bell jar gas flow standard device that optimizes, the device can examine and determine gas flowmeter high-efficiently reliably.

The purpose of the utility model is realized through the following technical scheme: a gas flow standard device for optimizing by linkage of double bell jars comprises a first bell jar, a second bell jar and an adjusting valve, wherein the capacity of the first bell jar is larger than that of the second bell jar, the first bell jar is connected with a gas inlet of a detected gas flowmeter through a pipeline, the adjusting valve is arranged on the pipeline between the first bell jar and the gas inlet of the detected gas flowmeter, a gas outlet of the detected gas flowmeter is connected with the second bell jar through a pipeline, the first bell jar is used as a gas source, gas discharged by descending of the first bell jar sequentially passes through the adjusting valve and the detected gas flowmeter, then enters the second bell jar and enables the second bell jar to ascend.

Preferably, the division value of the second bell jar is smaller than the division value of the first bell jar.

Preferably, the device is also provided with an upper computer which is connected with and controls the first bell jar, the second bell jar and the regulating valve.

Furthermore, the upper computer is an industrial personal computer.

Furthermore, the device also comprises a first temperature sensor, a first pressure sensor, a second temperature sensor and a second pressure sensor, wherein the first temperature sensor and the first pressure sensor are arranged on a pipeline between the first bell jar and the air inlet of the detected gas flowmeter, and the first temperature sensor and the first pressure sensor are connected with an upper computer; the second temperature sensor and the second pressure sensor are arranged in the second bell jar, and the second temperature sensor and the second pressure sensor are connected with the upper computer.

Preferably, the device also has a blower in communication with the first bell jar.

Preferably, a switching valve is arranged on a pipeline between the gas outlet of the detected gas flowmeter and the second bell jar.

The utility model discloses for prior art have following advantage and effect:

(1) the utility model discloses the gas flow standard device that two clock jars of linkage carry out the optimization has combined the characteristic of two kinds of devices of formula of admitting air bell jar standard device and exhaust formula bell jar standard device, including the first bell jar of large capacity, the second bell jar and the adjusting valve of small capacity. The device utilizes first bell jar to provide the air supply, can improve the warm-pressing stability of air supply, utilizes the second bell jar as the etalon, because the division value of little bell jar is less, therefore the standard value reading degree of accuracy is higher, has improved the reliability of examination result from this greatly.

(2) The utility model discloses two traditional bell jars of ingenious utilization of device can carry out the examination work of flowmeter high pressure, small flow point, have saved equipment and human cost input, have reduced energy resource consumption.

(3) The utility model discloses the device is compared with traditional bell jar device, and not only the measuring accuracy does not reduce (still be 0.2%), and examination efficiency still must improve moreover, for example, when examining and determine high pressure low discharge point, the utility model discloses the device need not use the method of formula of admitting air, and the start at every turn will wait for in the surge tank compressed gas constant temperature constant voltage after just can experiment, but can directly use gas as the air supply in the big bell jar, so, but the customer that has significantly reduced changes other produced business losses of throwing detection mechanism because of waiting for to detect.

Drawings

Fig. 1 is a schematic view of the connection between the gas flow calibration device and the gas flowmeter to be tested according to the present invention.

Detailed Description

The present invention will be described in further detail with reference to the following examples and drawings, but the present invention is not limited thereto.

Examples

The embodiment discloses a gas flow standard device for optimizing through linkage of double bells, which comprises a first bell jar 1, a second bell jar 2 and a regulating valve 3, as shown in fig. 1.

The first bell jar is connected with the gas inlet of the gas flowmeter to be detected 4 through a pipeline, a regulating valve is arranged on the pipeline between the first bell jar and the gas inlet of the gas flowmeter to be detected, and the gas outlet of the gas flowmeter to be detected is connected with the second bell jar through a pipeline. And a switching valve 5 can be arranged on a pipeline between the gas outlet of the detected gas flowmeter and the second bell jar.

The first bell jar and the second bell jar are both inverted cylinders capable of controlling ascending and descending. The gas pressure in the bell jar is higher than the atmospheric pressure due to the self weight of the bell jar, so when the gas outlet valve of the bell jar is opened, the bell jar descends at a certain speed, and the gas in the bell jar is discharged. The first bell jar and the second bell jar are respectively provided with a photoelectric encoder, the photoelectric encoder is used for collecting the running pulse number of the bell jar, and the gas volume discharged by the bell jar can be calculated according to the running pulse number of the bell jar.

Here, the capacity of the first bell jar is greater than the capacity of the second bell jar, and the division value of the second bell jar is smaller than the division value of the first bell jar. The type of the detected gas flowmeter comprises a diaphragm gas meter. The first bell jar is used as a gas source, and gas discharged by descending of the first bell jar sequentially passes through the regulating valve and the detected gas flowmeter and then enters the second bell jar to enable the second bell jar to ascend.

The device of the embodiment is also provided with a first temperature sensor and a first pressure sensor on a pipeline between the first bell jar and the gas inlet of the detected gas flowmeter, and a second temperature sensor and a second pressure sensor are arranged in the second bell jar. The first temperature sensor and the first pressure sensor are used for acquiring the pressure and the temperature of the air inlet end of the detected gas flowmeter, and the second temperature sensor and the second pressure sensor are used for acquiring the temperature and the pressure of the second bell jar.

The device is also provided with an upper computer 6 which can adopt an industrial personal computer. The upper computer is connected with the first bell jar, the second bell jar, the regulating valve, the first temperature sensor, the first pressure sensor, the second temperature sensor and the second pressure sensor.

The upper computer is provided with a configuration control system, the ascending and descending states of the first bell jar and the second bell jar can be controlled by inputting a control command through the configuration control system, the opening degree of the regulating valve can be controlled, the running pulse number of the first bell jar and the second bell jar, the pressure and the temperature of the air inlet end of the detected gas flowmeter, the temperature and the pressure of the second bell jar can be displayed through the configuration control system, and the actual flow passing through the detected gas flowmeter is calculated according to a known flow correction formula based on the data. Therefore, the indication error of the detected gas flowmeter can be obtained by calculating the relative error between the indication of the detected gas flowmeter and the actual flow rate.

In other embodiments, the first and second bell jars may be controlled to move up and down in other manners, for example, by providing a blower in the apparatus, communicating the blower with the bell jar, and moving the bell jar up by ventilating the blower to the bell jar. The working state of the blower can be controlled by the upper computer.

The process of calibrating the gas flow meter by using the gas flow standard device of the embodiment is as follows:

firstly, leak detection is carried out on the whole device, a bell jar carries out operation test according to specified flow, a mechanical counter of a gas flowmeter operates at a certain speed, and the operation is finished when each device is not abnormal;

and then, verifying the gas flowmeter to be detected according to each flow point. In each verification process, the first bell jar is controlled to rise to the highest point, the second bell jar is controlled to fall to the lowest point, the opening degrees of the regulating valve and each switch valve are set, then the gas outlet valve of the first bell jar is opened, the first bell jar is made to descend and exhaust gas, the gas which passes through the first bell jar after constant temperature and pressure sequentially passes through the regulating valve and the detected gas flowmeter, finally enters the second bell jar and makes the second bell jar rise, meanwhile, the photoelectric encoders of the first bell jar and the second bell jar respectively record the running pulse number of the bell jar and send the recorded running pulse number of the bell jar to an upper computer, and the first temperature sensor, the first pressure sensor, the second temperature sensor and the second pressure sensor send acquired sensing data to the upper computer.

The upper computer calculates the standard volume according to the running pulse number of the second bell jar, and then performs temperature and pressure correction on the standard volume of the second bell jar according to the pressure and temperature of the air inlet end of the detected gas flowmeter and the temperature and pressure data of the second bell jar to obtain the actual flow (which can be the actual instantaneous flow or the actual accumulated flow) of the detected gas flowmeter, so that the indicating value error of the detected meter can be calculated according to the actual flow and the indicating value of the detected gas flowmeter. And a bell jar control switch for controlling the lifting of the first bell jar and the second bell jar, the running pulse number of the bell jar, temperature and pressure data and the actual flow of the detected gas flowmeter are displayed on a configuration control system display interface of the upper computer. And through a plurality of times of experimental analysis, the uncertainty of the device measurement is 0.2%, and therefore, the metering accuracy of the device is stable and reliable.

The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be equivalent replacement modes, and all are included in the scope of the present invention.

Claims

1. The gas flow standard device is characterized by comprising a first bell jar, a second bell jar and an adjusting valve, wherein the capacity of the first bell jar is larger than that of the second bell jar, the first bell jar is connected with a gas inlet of a detected gas flowmeter through a pipeline, the adjusting valve is arranged on the pipeline between the first bell jar and the gas inlet of the detected gas flowmeter, a gas outlet of the detected gas flowmeter is connected with the second bell jar through a pipeline, the first bell jar is used as a gas source, gas discharged by descending of the first bell jar sequentially passes through the adjusting valve and the detected gas flowmeter, then enters the second bell jar and enables the second bell jar to ascend.

2. A linked double bell jar gas flow calibration device as claimed in claim 1 wherein the index of the second bell jar is less than the index of the first bell jar.

3. The gas flow calibration device with linked double bell jars for optimization according to claim 1, further comprising an upper computer, wherein the upper computer is connected with and controls the first bell jar, the second bell jar and the regulating valve.

4. The gas flow standard device for optimizing by linking two bell jars as claimed in claim 3, wherein the upper computer is an industrial personal computer.

5. The gas flow standard device for optimizing the linkage double bell jars as claimed in claim 3, further comprising a first temperature sensor, a first pressure sensor, a second temperature sensor and a second pressure sensor, wherein the first temperature sensor and the first pressure sensor are mounted on a pipeline between the first bell jar and the gas inlet of the gas flowmeter to be detected, and the first temperature sensor and the first pressure sensor are connected with an upper computer; the second temperature sensor and the second pressure sensor are arranged in the second bell jar, and the second temperature sensor and the second pressure sensor are connected with the upper computer.

6. A modular dual bell jar gas flow optimizer as claimed in claim 1 wherein the device further comprises a blower in communication with the first bell jar.

7. The gas flow rate standard device optimized by the linkage double-bell-jar as claimed in claim 1, wherein a pipeline between the gas outlet of the detected gas flowmeter and the second bell-jar is provided with a switch valve.