CN216050193U - Large-caliber flow standard device based on volumetric method and standard meter method - Google Patents
Large-caliber flow standard device based on volumetric method and standard meter method Download PDFInfo
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Abstract
本实用新型提供了一种基于容积法和标准表法的大口径流量标准装置，主要由水泵组、稳压罐、标准流量计组、流量调节阀、换向器、连通式工作量器和控制系统等组成，具有静态容积法标准装置扩展不确定度优的特点，同时具备标准表法标准装置上限流量大、测量口径广、检测效率高等优点，解决了600mm‑2400mm大口径流量计的计量溯源要求。
The utility model provides a large-caliber flow rate standard device based on the volume method and the standard meter method, which mainly consists of a water pump group, a pressure stabilizer tank, a standard flow rate group, a flow regulating valve, a commutator, a connected working volume device and a control device. It has the characteristics of excellent expansion uncertainty of the standard device of the static volume method, and at the same time, it has the advantages of large upper limit flow rate, wide measurement diameter and high detection efficiency of the standard device of the standard meter method, which solves the measurement traceability of the 600mm-2400mm large-diameter flowmeter. Require.
Description
Technical Field
The utility model belongs to the technical field of water flow metering and testing, and particularly relates to a large-caliber flow standard device based on a volumetric method and a standard meter method.
Background
In recent years, the flow metering technology and the flow meter have been developed rapidly and are widely applied to the fields of petrochemical engineering, water supply engineering, energy metering and the like. The accuracy grade of the flowmeter directly determines the fairness of trade, the safety of industrial production control, the effectiveness of environmental protection monitoring and the like. According to the 'catalogue of measuring instruments for implementing mandatory management' in China, the flowmeter belongs to a mandatory calibrating instrument, and the flowmeter needs to be calibrated for the first time, calibrated for the subsequent time and checked in use according to the calibration rule of the flowmeter.
In order to meet the requirements of verification and test work, more than 300 sets of flow standard devices are established for various metering technical mechanisms and flowmeter manufacturers. The method comprises various standard devices such as a static volume method, a static mass method, a variable water head and the like, wherein the detection caliber of the device is mostly concentrated in the range of 15-500 mm, the minimum caliber reaches DN1000mm, and the flow reaches 5000m3/h。
Along with the development of technology and economy, the use of domestic large-aperture flow meters is gradually increased, the apertures of electromagnetic flow meters, ultrasonic flow meters and the like used in engineering projects such as main urban water supply pipelines, south-to-north water transfer and the like reach 2000mm, and the large flow reaches 20000m3More than h, the conventional water flow standard device cannot meet the quantity value tracing requirement of a large-caliber flowmeter with the diameter of more than 2000mm, and the accuracy of metering data cannot be guaranteed.
Disclosure of Invention
The utility model aims to provide a large-caliber flow standard device based on a volumetric method and a standard meter method, so as to meet the measurement traceability requirement of a 600mm-2400mm large-caliber flow meter.
The technical solution for realizing the purpose of the utility model is as follows:
a large-caliber flow standard device based on a volume method and a standard meter method comprises a control unit, a water delivery unit, a pressure stabilizing unit, a water outlet pipe, a stop valve, a standard flowmeter, a flow regulating valve, an intersection pipe, a stop valve, a detected flowmeter, a flow regulating valve, a commutator, a bypass pipe, a first workload device, a second workload device and a water drain pipe;
the water delivery unit is used for delivering water to the pressure stabilizing unit; the pressure stabilizing unit is provided with a plurality of paths of water outlet pipes which are arranged side by side; each path of water outlet pipe is sequentially provided with a stop valve, a standard flowmeter and a flow regulating valve and is connected to a junction pipe; the junction pipe is provided with two paths of water outlet pipes, the first path of water outlet pipe is sequentially connected with the stop valve, the first detected flowmeter, the flow regulating valve and the water drain pipe, and the second path of water outlet pipe is sequentially connected with the stop valve, the second detected flowmeter, the flow regulating valve and the commutator; one path of the commutator is connected with a bypass pipe, the other path of the commutator is connected with a first workload device, and a first water drain valve is arranged below the first workload device; the first workload device is connected with a second workload device through a communicating valve, and a second water drain valve is arranged below the second workload device; the control unit is used for acquiring data of the first workload device, the second workload device, the standard flowmeter and the detected flowmeter and controlling the flow regulating valve, the first water drain valve, the second water drain valve, the water delivery unit and the reverser to work.
Compared with the prior art, the utility model has the following remarkable advantages:
(1) the working principle of the large-caliber water flow standard device is a mode combining a standard meter method and a static volume method, the large-caliber water flow standard device has the characteristic of excellent expansion uncertainty of the standard device of the static volume method, has the advantages of large upper limit flow, wide measuring caliber, high detection efficiency and the like of the standard device of the standard meter method, and meets the verification and test requirements of various flowmeters of 600mm-2400 mm.
(2) The standard device of static volume method has a covering caliber of 600-1000 mm and a maximum flow of 8000m3H, extended uncertainty: u is 0.05% (k is 2). The standard is composed of a work cell 1 (volume 20 m)3) And a work volume 2 (capacity 50 m)3) Is composed of a communicating valve for communicating with each other to form a communicating type work volume device (volume 70 m)3) Therefore, the volume of the workload meter is greatly increased, the measurement caliber and the flow range of the standard device are improved on the premise of keeping the uncertainty of the expansion of the standard device unchanged, and the quantity value tracing of the large-caliber flow meter is ensured.
(3) The standard device with standard meter method has a covering caliber of 600mm-2400m and a maximum flowAmount 24000m3And h, three DN1000mm and one DN600mm high-precision electromagnetic flow meters are used as the standard devices, so that the problem that an overweight electronic scale and an ultrahigh work capacity device cannot be used in a laboratory is solved, and the requirement of tracing the source of the quantity value of the ultra-large-diameter flow meter is met.
(4) For a detected flowmeter with the caliber of 600mm-1000mm, a static volume method standard device or a standard meter method standard device can be flexibly selected according to the accuracy of the detected flowmeter and the size of a flow point, so that the method is convenient, efficient, energy-saving and consumption-reducing.
(5) The 600mm-1000mm static volumetric method standard device can be used for daily detection work and can also be used for detecting four standard flowmeters, and the four standard flowmeters can carry out in-situ verification and traceability under the condition of no disassembly, so that the loss of disassembly and inspection for the large-caliber flowmeter, the measurement error caused by inconsistent traceability conditions and working conditions are avoided, and the in-situ traceability problem of the four standard meters is solved.
Drawings
FIG. 1 is a diagram showing the general structural arrangement of a standard device.
Fig. 2 is a block diagram of a control system.
Detailed Description
The utility model is further described with reference to the following figures and embodiments.
The utility model designs the large-caliber flow standard device based on the volumetric method and the standard meter method according to the technical requirements of the water flow standard device and the requirements of flow, flow rate and the like, and mainly comprises a water storage tank, a water pump set, a water inlet pipe, a pressure stabilizing tank, a water outlet pipe, a stop valve, a standard flow meter set, a flow regulating valve, a manifold, a detected flowmeter, a commutator, a communicating pipe, a communicating type work capacity device, a test pipeline and the like, wherein the standard flow meter set is formed by connecting a plurality of large-caliber electromagnetic flowmeters in parallel, the communicating type work capacity device is formed by a work capacity device 1 and a work capacity device 2 which are communicated with each other at the middle part, and the schematic diagram is shown in figure 1.
The water storage pool is connected with one end of a water pump set through a pipeline, the other end of the water pump set is connected to a water inlet pipe of a pressure stabilizing tank through a pipeline, a water outlet pipe of the pressure stabilizing tank is respectively connected with a standard flowmeter through four parallel stop valves, the standard flowmeters are respectively connected to a manifold in front of a detected flowmeter through flow regulating valves, a manifold outlet in front of the detected flowmeter is respectively connected with the detected flowmeter through two parallel stop valves, one path of the detected flowmeter is connected to a water discharge pipe through a flow regulating valve, and the other end of the water discharge pipe corresponds to the water storage pool; the other path is connected to a commutator through a flow regulating valve, one water outlet of the commutator corresponds to one end of a bypass pipe, the other end of the bypass pipe corresponds to a water storage tank, the other water outlet of the commutator corresponds to a workload device 1, the water outlet of the workload device 1 is connected with one end of a water drain valve 1 through a pipeline, and the other end of the water drain valve 1 corresponds to the water storage tank. The middle part of the work load device 1 is connected to the middle part of the work load device 2 through a communicating valve, the water outlet of the work load device 2 is connected with one end of a water drain valve 2 through a pipeline, and the other end of the water drain valve 2 corresponds to a water storage tank.
The control system of the large-caliber water flow standard device comprises a water pump, a frequency converter, a Programmable Logic Controller (PLC) and the like. The control system takes a PLC as a processing core, and a computer is a control mode of a human-computer interaction interface. Signals such as a water pump, a valve, flow, temperature (a temperature sensor arranged in a pipeline), pressure (a pressure sensor arranged in the pipeline), reversing, time (a timer) and the like are communicated with a PLC (programmable logic controller), the PLC is communicated with an industrial computer through a conversion module, and therefore functions of starting and stopping the water pump, controlling opening of an adjusting valve, reversing a reverser, collecting signals of a standard meter and a detected meter, calculating data and the like are achieved, and a block diagram of the PLC is shown in figure 2.
The standard device adopts a combination method of a standard meter method and a static volume method, and is suitable for the nominal diameter of 600mm-24000mm and the maximum flow rate of not more than 24000m3And h, calibrating and testing the large-caliber flow meter. The water pump group in the standard device comprises 6 water pumps with total power of 4000kw, the standard flowmeter group comprises four standard flowmeters with 4 standard flowmeter pipelines, and the standard flowmeters are three DN1000mm and one DN600mm from top to bottom respectively. The steady flow mode adopts a horizontal pressure stabilizing tank with the volume of 320m38400m in length, 7000mm in diameter, 15mm in wall thickness, 8000mm in length and 2400mm in diameter of the manifold. The 600mm-1000mm table comprises 600mm and 700mmThe five pipelines of 800mm, 900mm and 1000mm, the 1200mm-2400mm station comprises seven pipelines of 1200mm, 1400mm, 1600mm, 1800mm, 2000mm, 2200mm and 2400mm, two groups of stations detect corresponding different caliber flow timing, and a pipeline changing mode is adopted, so that the pipeline replacing mode is small in occupied space, convenient and efficient.
When the object to be detected is the flowmeter of 1200mm-2400mm, the 1200mm-2400mm pipeline in the standard meter method standard device is adopted. When the device works, the water pump is started to pump water in the water storage tank into the pressure stabilizing tank. And closing the stop valve GV-6, opening the stop valves GV-1-GV-5 and opening the flow regulating valves CV-1-CV-5, so that water passes through the pressure stabilizing tank, the four standard flow meters connected in parallel, the flow regulating valves, the manifold, the detected flow meter and the water discharge pipeline and is injected into the water storage pool. After the flow is stable, the PLC control system is started, the timing system is triggered, and signals of the four standard flowmeters and the detected flowmeter are acquired simultaneously. And after the set time is reached, recording the accumulated volume readings of the four standard flowmeters, the time of the timer and the accumulated volume readings of the detected flowmeter, calculating the indicating value error of the detected flowmeter and the like, and finishing one-time detection.
When the detection object is 600mm-1000mm, a static volumetric method standard device can be selected for detection. When the device works, the water pump is started to pump water in the water storage tank into the pressure stabilizing tank. Closing the stop valve GV-5, closing the drain valve 1 and the drain valve 2, opening the stop valves GV-1-GV-4 and GV-6, opening the flow regulating valves CV-1-CV-4 and CV-6, and opening the communicating valve to make water flow through the pressure stabilizing tank, the standard flow meter, the flow regulating valve, the manifold, the detected flow meter, the commutator at the upper end of the communicating type work meter and the bypass pipeline and then be injected into the water storage tank. After the flow is stable, the PLC control system is started, the commutator is switched to enable water to be changed into the work load device from the bypass pipe, and the timing system and the signal acquisition system are triggered at the same time. And after the set time is reached, the commutator is replaced into the bypass pipe, the volume of the communicating type work capacity device, the time of the timer and the accumulated volume reading of the detected flowmeter are recorded, the indication error of the detected flowmeter is calculated, and the like, so that one-time detection is completed.
Example 1
Detecting a DN2400mm multi-channel ultrasonic flowmeter with the accuracy grade of 1.0 and the flow point of 24000m3And h, selecting a 1200mm-2400mm pipeline in the standard meter method flow standard device for detection. Closing the stop valve GV-6, opening the stop valves GV-1-GV-5, opening the flow regulating valves CV-1-CV-5, starting the standard water flow standard device by the standard meter method, and simultaneously starting the timer and the signal acquisition system for detection. After the detection is finished, comparing the accumulated volume of the four standard flowmeters with the accumulated volume of the detected ultrasonic flowmeter, wherein the volume unit is as follows: cubic meter, m3. The data were obtained as follows:
the single measurement time is 180s, the total test is 6 times, the indication error is-0.27 percent, and the requirement of the multi-channel ultrasonic flowmeter on the flow point 24000m is met3The maximum allowable error of the/h is +/-1.0% of the measurement requirement.
Example 2
Detecting a DN600mm electromagnetic flowmeter with the accuracy grade of 0.5 and the flow point of 1800m3Selecting a static volume method standard device corresponding to the workload device, wherein the nominal volume of the workload device is 70m3. Closing the stop valve GV-5, closing the water drain valve 1 and the water drain valve 2, opening the stop valves GV-1-GV-4 and GV-6, opening the flow regulating valves CV-1-CV-4 and CV-6, opening the communicating valve, starting the static volume method standard device, and simultaneously starting the timer and the reverser for detection. After the detection is finished, comparing the volume reading of the working gauge with the accumulated volume reading of the electromagnetic flowmeter to be detected, wherein the volume unit is as follows: cubic meter, m3. The data were obtained as follows:
the single measurement time is 140s, the total test time is 6 times, the indication error is-0.38 percent, and the requirement of the power supply is metMagnetic flowmeter at 1800m flow point3Maximum allowable error of 0.5% of the measurement requirement/h.
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| CN119469313A (en) * | 2025-01-08 | 2025-02-18 | 广州能源检测研究院 | On-site multi-calibration adaptive calibration type automobile tanker capacity measurement and control system and calibration method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN119469313A (en) * | 2025-01-08 | 2025-02-18 | 广州能源检测研究院 | On-site multi-calibration adaptive calibration type automobile tanker capacity measurement and control system and calibration method |
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