CN111189626A - Gas meter flow fluctuation type mechanical endurance test system adopting sonic nozzle - Google Patents
Gas meter flow fluctuation type mechanical endurance test system adopting sonic nozzle Download PDFInfo
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 10
- 239000003345 natural gas Substances 0.000 description 5
- 125000004122 cyclic group Chemical group 0.000 description 4
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Abstract
The invention provides a gas meter flow fluctuation type mechanical endurance test system adopting a sonic nozzle, which comprises a front end valve, a plurality of gas meters to be tested, an inlet manifold, an electromagnetic pneumatic valve group, a sonic nozzle group, a single chip microcomputer, an outlet manifold and an air compressor, wherein the plurality of gas meters to be tested are connected in series or in parallel between the inlet manifold and the front end valve, the electromagnetic pneumatic valve group comprises a plurality of electromagnetic pneumatic valves electrically connected with the single chip microcomputer, the sonic nozzle group comprises a plurality of sonic nozzles which are arranged in pairs with the electromagnetic pneumatic valves and have different standard flow rates, the electromagnetic pneumatic valves and the sonic nozzles which are connected in pairs are connected in parallel between the other side of the inlet manifold and one side of the outlet manifold, and the other side of the outlet manifold is connected with the air compressor. The system adopts a plurality of sonic nozzles with different standard flows as the flow control mechanism, and switches the sonic nozzles with different standard flows by rapidly opening and closing the electromagnetic pneumatic valves, thereby realizing the flow change of the measured gas meter and having high flow control precision.
Description
Technical Field
The invention relates to the technical field of metering, in particular to a gas meter flow fluctuation type mechanical durability test system adopting a sonic nozzle.
Background
The energy is the most important material basis for human survival and development, and with the optimization and adjustment of energy structures in China, natural gas (including coal gas, liquefied petroleum gas and the like) is used as important primary energy, and the proportion of the natural gas in energy consumption in China is continuously improved. The accurate and reasonable metering work of the natural gas flow is one of the important links of the natural gas utilization.
Among the end users of natural gas, home users are in an absolutely dominant position in number relative to industrial and commercial users. At present, most household gas users still use a membrane gas meter as a gas metering appliance. The gas meter metering characteristics of the household gas user are that the total gas flow is small but the flow fluctuates frequently. Therefore, in the research and development test of the household diaphragm gas meter, the durability test is one of key subjects. Aiming at the characteristic that the fragmentation use scene of the household diaphragm gas meter is obvious, in the national standard GB/T6968 plus 2019 diaphragm gas meter which is implemented in 12, month and 01 in 2019, a diaphragm gas meter durability test requirement related to a flow fluctuation type cycle period method is added, and a durability test containing flow fluctuation is introduced, so that the durability and the reliability of the diaphragm gas meter under the full-life working condition are ensured.
At present, the institute has successfully developed "a negative pressure method gas table flow fluctuation formula machinery endurance test device" and "the flow fluctuation formula cycle test device that is used for domestic gas table endurance test" that adopts the malleation method of blowing "and has applied for the utility model patent. The inventor of the invention discovers through research that when the two devices carry out flow regulation, manual valves at the front end and the rear end of the measured gas meter are adopted to carry out flow manual regulation, and flow fluctuation and switching are realized through the rapid opening and closing of three pneumatic valves at the head part or the tail part of a pipeline, so that the test requirement of flow fluctuation can be met, the whole using process is more complicated, and the flow control precision of the gas meter flowing through the measured membrane is not high.
Therefore, it is necessary to further develop a testing system which is simple and convenient to operate and use, has flow control precision and reliable work, and has technical indexes meeting requirements of 'gas meter durability test by flow fluctuation cycle method' in national standard of GB/T6968-.
Disclosure of Invention
The invention provides a gas meter flow fluctuation type mechanical endurance test system adopting a sonic nozzle, aiming at the technical problems that when the flow is regulated, manual valves at the front end and the rear end of a measured gas meter are adopted to regulate the flow manually, and the flow fluctuation and switching are realized by the quick opening and closing of three pneumatic valves at the head part or the tail part of a pipeline, so that the test requirement of the flow fluctuation can be met, but the whole using process is more complicated, and the flow control precision of the membrane type gas meter to be measured is not high, the test system adopts the characteristic of constant standard flow of a single sonic nozzle, adopts a plurality of sonic nozzles with different standard flows to form a sonic nozzle group, and utilizes the opening and closing of the pneumatic valves of the solenoid valves to quickly switch the sonic nozzles with different standard flows, the flow fluctuation of the gas meter to be measured is realized.
In order to solve the technical problems, the invention adopts the following technical scheme:
a gas meter flow fluctuation type mechanical endurance test system adopting sonic nozzles comprises a front end valve, a plurality of tested gas meters, an inlet manifold, an electromagnetic pneumatic valve group, a sonic nozzle group, a single chip microcomputer, an outlet manifold and an air compressor, wherein the air inlet end of the front end valve is communicated with external air through a pipeline, the plurality of tested gas meters are connected in series or in parallel between one side of the inlet manifold and the air outlet end of the front end valve through a pipeline, the electromagnetic pneumatic valve group comprises a plurality of electromagnetic pneumatic valves, each electromagnetic pneumatic valve is electrically connected with the single chip microcomputer, the sonic nozzle group comprises a plurality of sonic nozzles which are configured in pairs with the electromagnetic pneumatic valves, the standard flow of each sonic nozzle in the sonic nozzle group is different, the plurality of electromagnetic pneumatic valves are connected in parallel to the other side of the inlet manifold through pipelines, and the front end of each sonic nozzle is connected with one electromagnetic pneumatic valve through a pipeline, the rear end of each sonic nozzle is connected with one side of an outlet manifold through a pipeline, and the other side of the outlet manifold is connected with an air compressor through a pipeline.
Compared with the prior art, the gas meter flow fluctuation type mechanical endurance test system adopting the sonic nozzle provided by the invention adopts a group of sonic nozzles with different standard flows as the flow control mechanism, avoids the problem of inaccurate flow control caused by adopting a manual valve to adjust the gas flow, namely the flow of a gas meter is adjusted to the inherent flow of the sonic nozzle, the flow control precision is high, the experimental steps are greatly simplified, the sonic nozzles with different standard flows are switched by quickly opening and closing the electromagnetic pneumatic valve, the change of the flow of the gas meter to be tested is realized, the purpose of flow fluctuation type cyclic periodic endurance test is achieved, the technical indexes of the whole system can meet all technical parameter requirements of GB/T6968 plus 2019 'gas meter endurance test adopting a flow fluctuation type cyclic periodic method' in national standard, and does not contain higher-price devices such as a precise pressure reducing valve and the like, and the manufacturing cost is greatly reduced.
Furthermore, three gas meters to be measured are connected in series between one side of the inlet header and the gas outlet end of the front end valve through pipelines.
Further, the standard flow of each sonic nozzle in the sonic nozzle group is combined by adopting a bisection method.
Further, the gas meters to be measured are G6 gas meters connected in series, and one standard flow of 10m is adopted corresponding to the sonic nozzle group3A sound velocity nozzle with a standard flow of 6.67m3A sonic nozzle and a standard flow rate of 3.33m3A sonic nozzle,/h.
Further, the gas meters to be measured are G4 gas meters connected in series, and one standard flow of 6m is adopted corresponding to the sonic nozzle group3A sound velocity nozzle with a standard flow of 4m3A sound velocity nozzle and a standard flow of 2m3A sonic nozzle,/h.
Further, the measuredThe gas meters are G2.5 gas meters connected in series, and one standard flow of 4m is adopted corresponding to the sonic nozzle group3A sound velocity nozzle with a standard flow rate of 2.67m3Sonic nozzle and a standard flow of 1.33m3A sonic nozzle,/h.
Furthermore, the gas meters to be measured are G1.6 gas meters connected in series, and one standard flow of 2.5m is adopted corresponding to the sonic nozzle group3A sound velocity nozzle with a standard flow of 1.67m3A sonic nozzle and a standard flow of 0.83m3A sonic nozzle,/h.
Furthermore, a pressure stabilizing tank is connected to a pipeline between the other side of the outlet header and the air compressor.
Drawings
Fig. 1 is a schematic structural diagram of a gas meter flow fluctuation type mechanical endurance test system adopting a sonic nozzle according to an embodiment of the present invention.
In the figure, 1, a front end valve; 2. a gas meter to be measured; 3. an inlet manifold; 4. an electromagnetic pneumatic valve group; 5. a sonic nozzle group; 6. an outlet manifold; 7. an air compressor.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below by combining the specific drawings.
In the description of the present invention, it is to be understood that the terms "longitudinal", "radial", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1, the present invention provides a gas meter flow fluctuation type mechanical endurance test system using a sonic nozzle, including a front end valve 1, a plurality of gas meters 2 to be tested, an inlet manifold 3, an electromagnetic pneumatic valve set 4, a sonic nozzle set 5, a single chip microcomputer (not shown), an outlet manifold 6 and an air compressor 7, wherein an air inlet end of the front end valve 1 is communicated with external air through a pipeline, that is, an air source at the air inlet end of the front end valve 1 is air, an air source pressure is atmospheric pressure and is stable, the plurality of gas meters 2 to be tested are connected in series or in parallel between one side of the inlet manifold 3 and an air outlet end of the front end valve 1 through a pipeline, the electromagnetic pneumatic valve set 4 includes a plurality of electromagnetic pneumatic valves, each electromagnetic pneumatic valve is electrically connected with an existing single chip microcomputer, the single chip microcomputer is used for controlling the circulation opening and closing of the electromagnetic pneumatic valves, circulating the air flow through the sonic nozzles with different standard flow rates to form air flow with different flow rates, so as to achieve the purpose of flow rate fluctuation, wherein the sonic nozzle set 5 comprises a plurality of sonic nozzles which are configured in pairs with electromagnetic pneumatic valves, namely, one electromagnetic pneumatic valve is correspondingly connected with one sonic nozzle, the standard flow rate of each sonic nozzle in the sonic nozzle set 5 is different, a plurality of electromagnetic pneumatic valves are connected in parallel with the other side of the inlet manifold 3 through pipelines, the front end of each sonic nozzle is connected with one electromagnetic pneumatic valve through a pipeline, the rear end of each sonic nozzle is connected with one side of the outlet manifold 6 through a pipeline, namely, a plurality of groups of electromagnetic pneumatic valves and sonic nozzles which are configured in pairs are connected in parallel between the inlet manifold 3 and the outlet manifold 6, and the other side of the outlet manifold 6 is connected with the air compressor 7 through a pipeline, the air compressor 7 is used for extracting air to form negative pressure so as to ensure the normal work of the sonic nozzle. The concrete structure of the sonic nozzle belongs to the prior art well known to those skilled in the art, and the basic principle is as follows: the sonic nozzle is a tapered flow passage, when the airflow passes through a tapered section, the speed is increased, the pressure is reduced, when the ratio of the downstream pressure and the upstream pressure of the nozzle reaches a critical state (the air is 0.528), the airflow with the smallest section (called throat part) of the sonic nozzle reaches the local sonic speed, at the moment, even if the downstream pressure is reduced again, the flow speed (flow) is kept constant, and at the moment, the flow passing through the sonic nozzle is called critical flow; after each sonic nozzle is manufactured, the critical flow (also called standard flow) of each sonic nozzle is constant, so that in the present application, a plurality of sonic nozzles with different standard flows form a sonic nozzle group according to the required maximum flow and minimum flow range, so as to adjust different flows.
Compared with the prior art, the gas meter flow fluctuation type mechanical endurance test system adopting the sonic nozzle provided by the invention adopts a group of sonic nozzles with different standard flows as the flow control mechanism, avoids the problem of inaccurate flow control caused by adopting a manual valve to adjust the gas flow, namely the flow of a gas meter is adjusted to the inherent flow of the sonic nozzle, the flow control precision is high, the experimental steps are greatly simplified, the sonic nozzles with different standard flows are switched by quickly opening and closing the electromagnetic pneumatic valve, the change of the flow of the gas meter to be tested is realized, the purpose of flow fluctuation type cyclic periodic endurance test is achieved, the technical indexes of the whole system can meet all technical parameter requirements of GB/T6968 plus 2019 'gas meter endurance test adopting a flow fluctuation type cyclic periodic method' in national standard, and does not contain higher-price devices such as a precise pressure reducing valve and the like, and the manufacturing cost is greatly reduced.
As a specific embodiment, the number of the measured gas meters 2 can be arbitrarily increased or decreased, any number of the measured gas meters can be connected in series or in parallel, and the series connection and the parallel connection of the measured gas meters can change the flow combination of the rear-end sonic nozzle group 5; as a specific implementation manner, please refer to fig. 1, three gas meters 2 to be measured are connected in series between one side of the inlet header 3 and the gas outlet end of the front end valve 1 through a pipeline.
As a specific embodiment, the standard flow rate of each sonic nozzle in the sonic nozzle group 5 is combined by a bisection method, specifically, in the case that the gas meters 2 to be tested are connected in series, if the standard flow rate of the sonic nozzles in the sonic nozzle group 5 is 10m at most3H, the group of sonic nozzles can adopt a standard flow of 10m3A sound velocity nozzle with a standard flow rate of 5m3A sound velocity nozzle with a standard flow rate of 2.5m3A sound velocity nozzle with a standard flow of 1.25m3A sound velocity nozzle of/h, and the like until the minimum standard flow is 0.016m3A sonic nozzle,/h. Of course, the skilled person can also realize the combination of the customized sonic nozzle, specifically the following four embodiments.
As a specific embodiment, the gas meter 2 to be measured is a G6 gas meter connected in series, and a standard flow of 10m is adopted for the sonic nozzle group 53A sound velocity nozzle with a standard flow of 6.67m3A sonic nozzle and a standard flow rate of 3.33m3The sound velocity nozzle group is formed by connecting the sound velocity nozzles of the type G6 in series, wherein the standard flow rate is 10m3/h、6.67m3H and 3.33m3And h consists of three sonic nozzles.
As another specific embodiment, the gas meter 2 to be measured is a G4 gas meter connected in series, and one standard flow of 6m is adopted corresponding to the sonic nozzle group 53A sound velocity nozzle with a standard flow of 4m3A sound velocity nozzle and a standard flow of 2m3The sound velocity nozzle group is formed by connecting the sound velocity nozzles of the type G4 in series, wherein the standard flow rate is 6m3/h、4m3H and 2m3And h consists of three sonic nozzles.
As another specific embodiment, the gas meter to be measured is a series-connected G2.5 gas meter, and one standard flow rate of 4m is adopted for the sonic nozzle group3A sound velocity nozzle with a standard flow rate of 2.67m3Sonic nozzle and a standard flow of 1.33m3The sound velocity nozzle group is formed by connecting gas meters with the model number of G2.5 in series, and the standard flow rate of the sound velocity nozzle group is 4m3/h、2.67m3H and 1.33m3And h consists of three sonic nozzles.
As another specific embodiment, the gas meters to be measured are G1.6 gas meters connected in series, and one standard flow rate of 2.5m is adopted for the sonic nozzle group3A sound velocity nozzle with a standard flow of 1.67m3A sonic nozzle and a standard flow of 0.83m3The sound velocity nozzle group has the standard flow of 2.5m when the gas meters with the type G1.6 are connected in series3/h、1.67m3H and 0.83m3And h consists of three sonic nozzles.
As a specific embodiment, a pressure stabilizing tank (not shown) is further connected to a pipeline between the other side of the outlet header 6 and the air compressor 7, and the pressure stabilizing tank can ensure pressure stability, and if the pressure stabilizing tank is arranged, an adjustable suction opening and a drainage device are required on the tank body.
In order to better understand the gas meter flow fluctuation type mechanical endurance test system adopting the sonic nozzle provided by the invention, the model G2.5 (the maximum standard flow is 4 m) is adopted below3The durability test of flow fluctuation when gas meters are connected in series is taken as an example to illustrate the specific working process of the system:
1) the front end of the gas meter to be measured is connected with the atmosphere, a front end valve in the figure 1 is opened, and an air compressor at the tail part is opened to form negative pressure, so that the ratio of the downstream pressure and the upstream pressure of the sonic nozzle is ensured to reach a critical state;
2) the flow rate fluctuation type mechanical durability test was started, and the standard flow rate was 2.67m3/h(2/3Qmax) Closing other electromagnetic pneumatic valves to make the air flow only pass through the electromagnetic pneumatic valve in front of the sonic nozzle, wherein the standard flow rate of the air flow is 2.67m3The operation time of the sonic nozzle is 5 +/-1 s; then the standard flow rate is opened to 1.33m3/h(1/3Qmax) The electromagnetic pneumatic valve in front of the sonic nozzle closes other electromagnetic airThe valve is moved to make the air flow only pass through the standard flow of 1.33m3The operation time of the sonic nozzle is 3 +/-1 s; then the standard flow is opened to 4m3/h(Qmax) Closing other electromagnetic pneumatic valves to make the air flow only pass through the electromagnetic pneumatic valve in front of the sonic nozzle and make the standard flow rate be 4m3The operation time of the sonic nozzle is 5 +/-1 s; finally, all the electromagnetic pneumatic valves are closed, the flow rate is 0, the operation is continued for 3 +/-1 s, so that one cycle is completed, and the test time at any flow rate point is adjustable.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (8)
1. A gas meter flow fluctuation type mechanical endurance test system adopting a sonic nozzle is characterized by comprising a front end valve, a plurality of gas meters to be tested, an inlet header, an electromagnetic pneumatic valve group, a sonic nozzle group, a single chip microcomputer, an outlet header and an air compressor, wherein the air inlet end of the front end valve is communicated with external air through a pipeline, the plurality of gas meters to be tested are connected in series or in parallel between one side of the inlet header and the air outlet end of the front end valve through the pipeline, the electromagnetic pneumatic valve group comprises a plurality of electromagnetic pneumatic valves, each electromagnetic pneumatic valve is electrically connected with the single chip microcomputer, the sonic nozzle group comprises a plurality of sonic nozzles which are configured in pair with the electromagnetic pneumatic valves, the standard flow of each sonic nozzle in the sonic nozzle group is different, and the plurality of electromagnetic pneumatic valves are connected in parallel to the other side of the inlet header through the pipeline, the front end of each sonic nozzle is connected with an electromagnetic pneumatic valve through a pipeline, the rear end of each sonic nozzle is connected with one side of an outlet manifold through a pipeline, and the other side of the outlet manifold is connected with an air compressor through a pipeline.
2. The gas meter flow fluctuation type mechanical endurance testing system adopting the sonic nozzle according to claim 1, wherein three gas meters to be tested are connected in series between one side of the inlet header and the gas outlet end of the front end valve through a pipeline.
3. The gas meter flow fluctuation type mechanical endurance testing system employing sonic nozzles, according to claim 1, wherein the standard flow rates of each sonic nozzle in the sonic nozzle group are combined using a bisection method.
4. The gas meter flow fluctuation type mechanical endurance testing system adopting the sonic nozzle as claimed in claim 1, wherein the gas meters to be tested are G6 gas meters connected in series, and one standard flow of 10m is adopted corresponding to the sonic nozzle group3A sound velocity nozzle with a standard flow of 6.67m3A sonic nozzle and a standard flow rate of 3.33m3A sonic nozzle,/h.
5. The gas meter flow fluctuation type mechanical endurance testing system adopting sonic nozzle as claimed in claim 1, wherein said gas meters to be tested are G4 gas meters connected in series, and one standard flow of 6m is adopted corresponding to said sonic nozzle group3A sound velocity nozzle with a standard flow of 4m3A sound velocity nozzle and a standard flow of 2m3A sonic nozzle,/h.
6. The gas meter flow fluctuation type mechanical endurance testing system adopting sonic nozzle as claimed in claim 1, wherein said gas meters to be tested are G2.5 gas meters connected in series, and one standard flow of 4m is adopted corresponding to said sonic nozzle group3A sound velocity nozzle with a standard flow rate of 2.67m3Sonic nozzle and a standard flow of 1.33m3A sonic nozzle,/h.
7. Gas meter flow using sonic nozzle according to claim 1The system is characterized in that the gas meters to be measured are G1.6 gas meters connected in series, and one standard flow rate corresponding to the sonic nozzle group is 2.5m3A sound velocity nozzle with a standard flow of 1.67m3A sonic nozzle and a standard flow of 0.83m3A sonic nozzle,/h.
8. The gas meter flow fluctuation type mechanical endurance testing system employing the sonic nozzle as claimed in claim 1, wherein a surge tank is further connected to a pipeline between the other side of the outlet header and the air compressor.
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| CN202010041776.3A CN111189626A (en) | 2020-01-15 | 2020-01-15 | Gas meter flow fluctuation type mechanical endurance test system adopting sonic nozzle |
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| CN202010041776.3A CN111189626A (en) | 2020-01-15 | 2020-01-15 | Gas meter flow fluctuation type mechanical endurance test system adopting sonic nozzle |
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| CN201757662U (en) * | 2010-08-10 | 2011-03-09 | 丹东东发(集团)股份有限公司 | Gas meter actual medium durability testing machine |
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| CN206725050U (en) * | 2017-04-14 | 2017-12-08 | 广州正海科技开发有限公司 | Sonic nozzle air mass flow generating means |
| CN209387107U (en) * | 2019-03-23 | 2019-09-13 | 重庆市计量质量检测研究院 | A kind of flow waves dynamic formula mechanical endurance test system for domestic gas meter |
| CN211178959U (en) * | 2020-01-15 | 2020-08-04 | 重庆市计量质量检测研究院 | Gas meter flow fluctuation type mechanical endurance test device adopting sonic nozzle |
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2020
- 2020-01-15 CN CN202010041776.3A patent/CN111189626A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201757662U (en) * | 2010-08-10 | 2011-03-09 | 丹东东发(集团)股份有限公司 | Gas meter actual medium durability testing machine |
| CN201757664U (en) * | 2010-08-10 | 2011-03-09 | 丹东东发(集团)股份有限公司 | Gas meter ageing simulation testing machine |
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