阅读说明：本技术 一种用于检测燃气表的小体积定流量检表装置 (Small-volume fixed flow meter detection device for detecting gas meter ) 是由 侯凤林 尚旭 柴峰 张永宏 艾亮 胡伟莉 张巍巍 周厚昌 于 2020-06-24 设计创作，主要内容包括：本发明的目的是提供一种用于检测燃气表的小体积定流量检表装置,用于减小装置体积,方便操作,误差小,包括真空泵、气体罗茨流量计、气源、第一管路、第二管路、第三管路,所述真空泵通过第一管路与气体罗茨流量计的一端连通,所述气体罗茨流量计的另一端与第二管路连通,所述气源与第三管路连通,通过设置由真空泵、气体罗茨流量计、燃气表、气源依次串联形成的小体积定流量检表装置,改变了检测原理,将原有的定体积的检表方式改为定流量检表方式,不再需要体积巨大的钟罩,缩小了装置体积,减小了误差,提高了效率。(The invention aims to provide a small-volume fixed-flow meter detecting device for detecting a gas meter, which is used for reducing the volume of the device, is convenient to operate and has small error.)

1. The utility model provides a little volume flow volume examines table device for detecting gas table which characterized in that: the gas meter comprises a vacuum pump, a gas roots flowmeter, a gas source, a first pipeline, a second pipeline and a third pipeline, wherein the vacuum pump is communicated with one end of the gas roots flowmeter through the first pipeline, the other end of the gas roots flowmeter is communicated with one end of the second pipeline, the other end of the second pipeline is communicated with a gas outlet end of the gas meter, and a gas inlet end of the gas meter is communicated with the gas source through the third pipeline.

2. A small volume flow rate meter calibrating device for detecting a gas meter according to claim 1, wherein: the gas Roots type flowmeter is characterized in that the gas Roots type flowmeters are multiple sets, one end of each set of the gas Roots type flowmeters is connected with the vacuum pump after being connected in parallel, and the other end of each set of the gas Roots type flowmeters is connected with the gas outlet end of the gas meter.

3. A small volume flow rate meter calibrating device for detecting a gas meter according to claim 1, wherein: the gas Roots flowmeter further comprises a computer control system, and the input end of the computer control system is connected with the output end of the gas Roots flowmeter.

4. A small volume flow rate meter calibrating device for detecting a gas meter according to claim 2, wherein: and valves are arranged at two ends of the gas Roots flowmeter.

5. The small volume flow meter calibrating device for detecting the gas meter according to claim 4, wherein: the second pipeline and the third pipeline are large-flow pipelines.

Technical Field

The invention belongs to the technical field of gas meter detection, and particularly relates to a small-volume constant-flow meter detection device for detecting a gas meter.

Background

The existing gas meter 9 detection method is a large-scale tank type constant volume detection method, the detected content is whether the number of flowing gas is consistent with the meter display, and the detection is performed by a 2000L bell-type gas flow standard device, as shown in FIG. 1, the gas meter comprises a bell-type device 10, an air inlet valve 11, a micro-pressure meter 12, an air outlet valve 13 and a flow regulator 14, a counter weight 15 for regulating pressure is connected on the cover body of the bell-type, the air outlet end of the bell-type is connected with the air inlet end of the gas meter 9 through the air inlet valve 11, the air outlet end of the gas meter 9 is connected with the flow regulator 14 through the air outlet valve 13, when the meter is detected, the counter weight 15 is firstly regulated to obtain the required working pressure, when the bell-type is descended, the gas in the bell-type is discharged and passes through the gas meter 9, the micro-pressure meter 12 is used for measuring pressure loss, the flow regulator 14 is used for regulating the air outlet amount, the meter is a metering instrument using the, the method is characterized in that a fixed gas quantity is discharged through a gas meter 9, then the flowing quantity of the gas meter 9 is observed, and the gas quantity is compared with the fixed gas quantity to judge whether the gas meter 9 is normal, but the method has the following defects: 1. the bell jar device 10 of the equipment is detected and calibrated by a static method, human errors are inevitably introduced due to the existence of human operation factors, a starting and stopping process exists in the measuring process, and the accuracy of a measuring result is influenced by the inertia effect of bell jar pressing gas; 2. because the device is a 2000L bell-type gas flow standard device, the lifting time of each bell-type gas intake needs about half an hour, the consumed time is long, and the verification efficiency is influenced; 3. the device is bulky, and very occupation space extrudees the working face of examination operation, can only single examination, calibration, and the device height has the second floor height moreover, and the maintenance work degree of difficulty is very big, needs to ascend a height and many people cooperate and go on, if sets up indoor, needs to get through the floor between the two floors, operates on the second floor.

Disclosure of Invention

The invention aims to provide a small-volume flow rate detection device for detecting a gas meter, which is used for reducing the volume of the device, is convenient to operate and has small error.

The technical scheme for solving the technical problems of the invention is as follows: the small-volume fixed flow meter detection device for detecting the gas meter comprises a vacuum pump, a gas roots type flowmeter, a gas source, a first pipeline, a second pipeline and a third pipeline, wherein the vacuum pump is communicated with one end of the gas roots type flowmeter through the first pipeline, the other end of the gas roots type flowmeter is communicated with one end of the second pipeline, the other end of the second pipeline is communicated with a gas outlet end of the gas meter, and a gas inlet end of the gas meter is communicated with the gas source through the third pipeline.

In order to detect a large-flow gas meter, the gas Roots flow meters are multiple sets, one end of each set of gas Roots flow meter is connected with the vacuum pump after the multiple sets of gas Roots flow meters are connected in parallel, and the other end of each set of gas Roots flow meter is connected with the gas outlet end of the gas meter.

The gas Roots flowmeter is convenient to calculate the numerical value of the gas Roots flowmeter and manage data, and the gas Roots flowmeter further comprises a computer control system, wherein the input end of the computer control system is connected with the output end of the gas Roots flowmeter.

In order to close one set of gas roots flowmeter when detecting the small flow meter, both ends of the gas roots flowmeter are provided with valves.

The invention has the beneficial effects that: through setting up the little volume flow that is formed by vacuum pump, gaseous roots flowmeter, gas table, air supply series connection in proper order and examining the table device, changed the detection principle, the table mode of examining that will have original definite volume changes the flow into and examines the table mode, no longer needs huge bell jar of volume, has reduced the device volume, has reduced the error, has improved efficiency.

Drawings

FIG. 1 is a schematic diagram of a 2000L bell gas flow standard device.

Fig. 2 is a schematic structural diagram of the present invention.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. 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.

As shown in fig. 2, the gas meter comprises a vacuum pump 1, a gas roots flowmeter 2, a gas source, a first pipeline 4, a second pipeline 5 and a third pipeline 6, wherein the vacuum pump 1 is communicated with one end of the gas roots flowmeter 2 through the first pipeline 4, the other end of the gas roots flowmeter 2 is communicated with one end of the second pipeline 5, the other end of the second pipeline 5 is communicated with a gas outlet end of a gas meter 9, and a gas inlet end of the gas meter 9 is communicated with the gas source through the third pipeline 6.

In order to detect a large-flow gas meter, the gas roots type flow meters 2 are multiple sets, one end of each of the multiple sets of gas roots type flow meters 2 is connected with the vacuum pump 1 after being connected in parallel, the other end of each of the multiple sets of gas roots type flow meters 2 is connected with the gas outlet end of the gas meter 9, and in the embodiment, the gas roots type flow meters 2 are two sets.

The gas Roots type flowmeter is characterized by further comprising a computer control system 7, wherein the input end of the computer control system 7 is connected with the output end of the gas Roots type flowmeter 2 through a connecting wire 3, and the numerical value of the gas Roots type flowmeter 2 is calculated conveniently and data management is facilitated.

In order to close one set of the gas roots flowmeter 2 when detecting the small flow meter, both ends of the gas roots flowmeter 2 are provided with valves 8.

During utensil physical examination, the end of giving vent to anger with gas table 9 communicates with second pipeline 5, the inlet end and the third pipeline 6 intercommunication with gas table 9, close the valve 8 at one of them set of gas roots flowmeter 2 both ends, open the valve 8 at another set of gas roots flowmeter 2 both ends, open vacuum pump 1 and begin to bleed, the gas of gas supply is through second pipeline 5 process gas roots flowmeter 2 after getting into gas table 9 through third pipeline 6, the numerical value that gas roots flowmeter 2 surveyed is sent for computer control system 7, numerical value that surveys through gas roots flowmeter 2 compares with the numerical value on the gas table 9, whether this gas table 9 is normal is obtained.

If when detecting large-traffic gas table 9, open the valve 8 at two ends of two sets of gas roots flowmeter 2 simultaneously, and change second pipeline 5, third pipeline 6 into large-traffic pipeline, in practical application, can set up second pipeline 5, third pipeline 6 into many sets and add valve 8, when needing to use one of them, just close another set, communicate the inlet end and the third pipeline 6 of gas table 9, open vacuum pump 1 and begin to bleed, the gas of air supply passes through gas roots flowmeter 2 through second pipeline 5 after getting into gas table 9 through third pipeline 6, the numerical value that gas roots flowmeter 2 surveyed is sent to computer control system 7, numerical value that measures through gas roots flowmeter 2 compares with the numerical value on the gas table 9, whether this gas table 9 is normal or not is obtained.

Because of adopting the mode of establishing ties, when opening vacuum pump 1, gas flows through gas table 9 back and flows through gas roots flowmeter 2 again, and the numerical value of both changes together, and the error is less than comparing in original mode.

Through setting up the little volume flow that is formed by vacuum pump, gaseous roots flowmeter, gas table, air supply series connection in proper order and examining the table device, changed the detection principle, the table mode of examining that will have original definite volume changes the flow into and examines the table mode, no longer needs huge bell jar of volume, has reduced the device volume, has reduced the error, has improved efficiency.