Online detection and calibration system for air inlet flow meter

Abstract

The utility model discloses an on-line detection and calibration system for a gas inlet flow meter, which relates to the field of gas flow meter calibration and comprises a nozzle flow meter, a gas inlet flow meter and a gas analyzer which are sequentially connected in series and are communicated through a gas inlet pipeline. The nozzle flowmeter is connected with a standard gas source and is used for spraying gas in the standard gas source into the gas inlet pipeline and enabling the gas to sequentially flow through the gas inlet flowmeter and the gas analyzer; according to the mass M1 of the propane gas injected by the nozzle flowmeter and the propane gas M2, measured by the gas inlet flowmeter and the gas analyzer, at the tail end of the gas inlet flowmeter, whether the measured data of the gas inlet flowmeter are reliable or not is judged according to the numerical value obtained by comparing the difference value of the M1 and the M2 with the M2, online calibration is conducted on the gas inlet flowmeter, and the gas inlet flowmeter can be accurately measured. On the premise that the air inlet flow meter is not disassembled, online inspection and calibration of the high-horsepower engine air inlet flow meter are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of gas flowmeter calibration, more particularly to an intake flowmeter online detection calibration system. BACKGROUND

[0002] The intake flowmeter of a large horsepower engine needs to be periodically calibrated according to standard regulations. Currently, the calibration is usually carried out by disassembling and shipping the flowmeter to a detection center for detection or by using a calibration table.

[0003] This method has little effect on the repeatability and reproducibility of the data of a flowmeter with small flow and small pipe diameter. However, for a flowmeter with large flow and large pipe diameter, the disassembly and recovery of the flowmeter are risky, and the repeatability and reproducibility of the flowmeter are poor.

[0004] The disassembly is quite demanding for the pipeline, which is likely to cause pipeline leakage and instability of the flowmeter during the disassembly process. The maintenance workload of leak detection and inspection is huge. The intake flowmeter of a large horsepower engine needs to use hoisting tools during disassembly, which is time-consuming and labor-intensive, and the disassembly process is likely to cause pipeline leakage and poor stability of the equipment.

[0005] To sum up, how to realize online inspection and calibration of the intake flowmeter of a large horsepower engine without disassembly is a problem to be solved by the technical personnel in the field. UTILITY MODEL CONTENTS

[0006] Therefore, the utility model aims to provide an intake flowmeter online detection calibration system, which effectively realizes online inspection and calibration of the intake flowmeter of a large horsepower engine without disassembly.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0008] An intake flowmeter online detection calibration system comprises a nozzle flowmeter, an intake flowmeter and a gas analyzer connected in series, wherein the nozzle flowmeter, the intake flowmeter and the gas analyzer are communicated through an intake pipeline.

[0009] The nozzle flowmeter is connected with a standard gas source, and is used to spray the gas in the standard gas source into the intake pipeline and flow through the intake flowmeter and the gas analyzer in sequence.

[0010] Preferably, the nozzle flowmeter comprises a main body and a spray hole arranged on the main body, the spray hole penetrates into the intake pipeline of the engine, and the main body is fixed to the intake pipeline through a connecting piece.

[0011] Preferably, the nozzle adopts a honeycomb nozzle structure, and a plurality of micro-pore channels are arranged in the nozzle in a staggered manner.

[0012] Preferably, the gas in the standard gas source is propane gas with a purity greater than 99.5%, and a gas concentration detection alarm instrument is arranged between the standard gas source and the nozzle flowmeter.

[0013] Preferably, a plurality of gas analyzers are arranged, and the plurality of gas analyzers are uniformly arranged at the outlet end of the inlet flowmeter.

[0014] Preferably, a spiral flow channel is formed on the inner wall of the inlet pipeline to reduce the turbulent flow of the gas in the inlet pipeline.

[0015] Preferably, the inlet pipeline is formed by splicing a plurality of ceramic composite steel pipes, and the plurality of ceramic composite steel pipes are fixed by flanges.

[0016] Preferably, the system further comprises a control module, wherein the control module comprises:

[0017] a PLC controller for controlling the nozzle flowmeter, the inlet flowmeter and the gas analyzer;

[0018] a data acquisition card for acquiring data in the nozzle flowmeter, the inlet flowmeter and the gas analyzer;

[0019] a terminal control module for displaying and processing the data acquired by the data acquisition card.

[0020] Preferably, the system further comprises a data storage module for recording and storing various parameters of system operation.

[0021] Preferably, the system further comprises a wireless communication module for remotely transmitting the measurement data of the nozzle flowmeter, the inlet flowmeter and the gas analyzer to a remote control center, and the wireless communication module supports a plurality of communication protocols, including but not limited to TCP / IP, Bluetooth and Zigbee.

[0022] The inlet flowmeter online detection and calibration system comprises a nozzle flowmeter, an inlet flowmeter and a gas analyzer which are connected in series, the nozzle flowmeter, the inlet flowmeter and the gas analyzer are communicated through an inlet pipeline, the nozzle flowmeter is connected with a standard gas source, and the nozzle flowmeter is used for spraying the gas in the standard gas source into the inlet pipeline and sequentially flowing through the inlet flowmeter and the gas analyzer.

[0023] The application provides an online detection and calibration system of an air intake flowmeter. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of the provided drawings.

[0025] Figure 1 Fig. 1 is a schematic diagram of an online detection and calibration system of an air intake flowmeter.

[0026] The reference signs include:

[0027] 1, nozzle flowmeter; 2, air intake flowmeter; 3, gas analyzer; 4, standard gas source; 5, air intake pipeline. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative effort fall within the scope of the present application.

[0029] Unless otherwise defined, the technical terms or scientific terms used in the present application should be understood as the common meanings understood by those skilled in the art to which the present application belongs. The terms "first", "second" and similar terms used in the present application do not represent any order, number or importance. The terms "connected" or "connected" and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "up", "down", "left", "right" and the like are only used to represent relative positional relationships, and when the absolute positions of the described objects are changed, the relative positional relationships can also be changed accordingly. The embodiments of the present application disclose an online detection and calibration system of an air intake flowmeter.

[0030] The core of the present application is to provide an online detection and calibration system of an air intake flowmeter.

[0031] Reference is made to Figure 1 .

[0032] The air intake flowmeter online detection and calibration system provided by the utility model includes nozzle flowmeter 1, air intake flowmeter 2 and gas analyzer 3 which are connected in sequence, and the three are communicated through air intake pipeline 5;

[0033] The nozzle flowmeter 1 is connected with standard gas source 4, and is used for spraying the gas in the standard gas source 4 into the air intake pipeline 5 and sequentially flowing through the air intake flowmeter 2 and the gas analyzer 3.

[0034] Specifically, the nozzle flowmeter 1, the air intake flowmeter 2 and the gas analyzer 3 are connected in sequence and communicated through the air intake pipeline 5, the nozzle flowmeter 1 sprays a certain amount of propane gas into the air intake pipeline 5 and sequentially passes through the air intake flowmeter 2 and the gas analyzer 3, wherein the mass of the propane gas sprayed by the nozzle flowmeter 1 into the air intake pipeline 5 is M1, after passing through the air intake flowmeter 2 and the gas analyzer 3, the flow and the concentration obtained by the air intake flowmeter 2 and the gas analyzer 3 are used to measure the mass M2 of the propane gas at the end of the air intake flowmeter 2, according to the difference between M1 and M2 and the ratio of M2, that is, (M2-M1) / M2, when the obtained value is less than ±2%, it can be determined that the measurement data of the air intake flowmeter 2 is reliable. The propane gas sprayed by the nozzle flowmeter 1 is supplied by the standard gas source 4, so that the nozzle flowmeter 1 can obtain continuous and stable propane gas, and the stability during system operation is ensured.

[0035] The above-mentioned air intake flowmeter online detection and calibration system effectively realizes the online inspection and calibration of the air intake flowmeter 2 of the large horsepower engine without dismounting the air intake flowmeter 2, ensures the reliability and accuracy of the air intake flowmeter during the calibration period, effectively reduces the frequency of dismounting and mounting the air intake flowmeter 2, reduces the leakage and flowmeter failure maintenance cost caused by dismounting and mounting the engine air intake flowmeter 2, reduces the maintenance difficulty, reduces the bench downtime, improves the bench utilization efficiency, and increases the use efficiency of the air intake flowmeter 2.

[0036] The air intake flowmeter online detection and calibration system provided by the utility model will be described in more detail in combination with the drawings and specific embodiments.

[0037] In a specific embodiment, the nozzle flowmeter 1 includes a main body and a spray hole arranged on the main body, the spray hole penetrates into the air intake pipeline 5, and the main body is fixed to the air intake pipeline 5 through a connecting piece (not shown in the figure).

[0038] Specifically, the main body is provided with external threads, and the gas inlet pipeline 5 is provided with corresponding internal threads. The two are fixed by screwing. This method is simple and reliable, easy to install and disassemble, but attention should be paid to the use of sealing rings to prevent gas leakage. The injection hole penetrates into the gas inlet pipeline 5, so that the gas injected by the nozzle flowmeter 1 is better injected into the gas inlet pipeline 5.

[0039] In other embodiments, the main body can also be provided with a flange, and the gas inlet pipeline 5 is also provided with a corresponding flange, which are fixed together by bolts and gaskets. This method is suitable for high pressure and high temperature environments, has high connection strength and good sealing performance, but the installation and disassembly are relatively complex.

[0040] On the basis of any one of the above embodiments, the injection hole adopts a honeycomb nozzle structure, and the injection hole is provided with a plurality of layers of staggered micropore channels (not shown in the figure).

[0041] Specifically, the injection hole adopts a honeycomb nozzle structure. The honeycomb nozzle, also known as a cluster nozzle or a multi-hole nozzle, disperses the flow of a single nozzle to a plurality of small holes, increases the contact area, improves the mixing efficiency of standard gas and air, and thus improves the mixing rate. The multi-layer staggered micropore channels can form multiple layers of injection holes, so that the high-speed gas injection is sucked and mixed in the valve chamber to form a strong turbulent airflow, thereby effectively reducing the energy. This design is particularly suitable for occasions that require energy dissipation, such as pressure reducing valve chambers in water conservancy projects. In addition, a multi-point straight-hole nozzle or a conical nozzle can also be selected as an alternative solution to adapt to different working environments and needs.

[0042] On the basis of any one of the above embodiments, the gas in the standard gas source 4 is propane gas with a purity of more than 99.5%, and a gas concentration detection alarm instrument is arranged between the standard gas source 4 and the nozzle flowmeter 1.

[0043] Specifically, the gas in the standard gas source 4 is propane gas with a purity of more than 99.5%, and preferably propane gas with a purity of 99.9%. A gas concentration detection alarm instrument is arranged between the standard gas source 4 and the nozzle flowmeter 1 to measure whether the gas concentration of the gas injected by the nozzle flowmeter 1 is the set concentration, ensure the accuracy of the subsequent calibration process of the gas inlet flowmeter 2, and improve the accuracy of the system measurement.

[0044] On the basis of any one of the above embodiments, the gas analyzer 3 is provided with a plurality of gas analyzers 3, and the plurality of gas analyzers 3 are uniformly arranged at the outlet end of the gas inlet flowmeter 2.

[0045] Specifically, the gas analyzer 3 can even have multiple, set at multiple points at the end of the intake flow meter 2. When one of the gas analyzers 3 deviates significantly from the value of (M2-M1) / M2 measured above, at least 5 points of the intake flow meter 2 need to be measured by the remaining multiple gas analyzers 3, and the measurement results are linearly fitted to calculate a new polynomial fourth-order fitting curve, that is, a new correction coefficient is generated, which is set to the intake flow meter 2 to ensure the accuracy of the intake flow meter 2 measurement, and then the (M2-M1) / M2 value is measured again until M1 and M2 deviate within a reasonable theoretical range.

[0046] On the basis of any one of the above embodiments, a spiral flow channel (not shown in the figure) is formed on the inner wall of the intake pipe 5 to reduce the turbulence of the gas inside the intake pipe 5.

[0047] Specifically, the inner wall of the intake pipe 5 is shaped with a spiral flow channel to reduce the turbulence of the gas inside the intake pipe 5, effectively reducing the energy loss in the gas flow and improving the stability of the gas flow. In addition, a smooth inner wall or a design with multiple sections of gradually changing diameter can also be selected to adapt to different fluid characteristics and test conditions.

[0048] On the basis of any one of the above embodiments, the intake pipe 5 is made of multiple ceramic composite steel pipes spliced together, and the multiple ceramic composite steel pipes are fixed by flanges.

[0049] Specifically, the ceramic composite steel pipe has excellent high-temperature resistance and corrosion resistance, and is particularly suitable for the working environment of high-horsepower engines. The two adjacent ceramic composite steel pipes are fixed together by flanges, bolts and gaskets. In addition, stainless steel pipes or aluminum alloy pipes can also be selected to reduce costs and improve flexibility.

[0050] On the basis of any one of the above embodiments, the intake flow meter online detection and calibration system further comprises a control module, which includes a PLC controller, a data acquisition card and a terminal control module. The PLC controller is used to control the operation of the nozzle flow meter 1, the intake flow meter 2 and the gas analyzer 3. The data acquisition card is used to collect data in the nozzle flow meter 1, the intake flow meter 2 and the gas analyzer 3. The terminal control module is used to display and process the data collected by the data acquisition card.

[0051] Specifically, the PLC controller is used to control the nozzle flowmeter 1, the inlet flowmeter 2 and the gas analyzer 3, complete the control of the nozzle flowmeter 1 to spray gas into the inlet pipeline 5, control the inlet flowmeter 2 and the gas analyzer 3 to work to select the gas quality, the data obtained by the nozzle flowmeter 1, the inlet flowmeter 2 and the gas analyzer 3 are collected by the data acquisition card and transmitted to the terminal control module to realize data visualization, the terminal control module can also increase the data processing module, process the collected data, and calibrate the inlet flowmeter 2 online according to the processing result, without disassembling the inlet flowmeter, the calibration can be completed, which greatly reduces the maintenance cost and downtime.

[0052] On the basis of any one of the above embodiments, the inlet flowmeter online detection and calibration system further comprises a data storage module for recording and storing various parameters of system operation.

[0053] Specifically, the data storage module is used to record and store various parameters of system operation, facilitating subsequent data analysis and historical record query. In addition, cloud storage function can be added to upload data to the cloud for remote management and data analysis.

[0054] On the basis of any one of the above embodiments, the inlet flowmeter online detection and calibration system further comprises a wireless communication module for remotely transmitting the measurement data of the nozzle flowmeter 1, the inlet flowmeter 2 and the gas analyzer 3 to the remote control center. The wireless communication module supports multiple communication protocols, including but not limited to TCP / IP, Bluetooth and Zigbee.

[0055] Specifically, the wireless communication module is used to remotely transmit the measurement data of the nozzle flowmeter 1, the inlet flowmeter 2 and the gas analyzer 3 to the remote control center, and the online calibration of the inlet flowmeter 2 is performed remotely to realize remote control of the system. The wireless communication module supports multiple communication protocols, including but not limited to TCP / IP, Bluetooth and Zigbee. In this way, real-time monitoring and remote diagnosis can be realized, and the intelligent level of the system can be improved.

[0056] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0057] The above has carried out the detailed introduction to the online detection and calibration system of the air intake flowmeter provided by the utility model. The principle and implementation mode of the utility model are described by applying specific examples in this paper, and the above embodiment description is only used to help understand the method and core idea of the utility model. It should be pointed out that for ordinary skilled persons in the technical field, the utility model can be improved and modified in several ways without departing from the principle of the utility model, and these improvements and modifications also fall within the protection scope of the utility model.

Claims

1. An in-line detection calibration system for a mass air flow meter, comprising: Including nozzle flowmeter (1), intake flowmeter (2) and gas analyzer (3) in turn in series, nozzle flowmeter (1), intake flowmeter (2) and gas analyzer (3) are communicated by intake pipeline (5) three; The nozzle flowmeter (1) is connected with the standard gas source (4), and the nozzle flowmeter (1) is used for spraying the gas in the standard gas source (4) into the intake pipeline (5) and sequentially flowing through the intake flowmeter (2) and the gas analyzer (3).

2. The online detection and calibration system for a mass airflow sensor according to claim 1, wherein, The nozzle flowmeter (1) includes a main body and a spray hole arranged on the main body, the spray hole is deep into the intake pipeline (5), and the main body is fixed on the intake pipeline (5) through a connecting piece.

3. The online detection and calibration system for a mass airflow sensor of claim 2, wherein, The spray hole adopts a honeycomb nozzle structure, and a plurality of micro-pore channels arranged in layers are arranged inside the spray hole.

4. The online detection and calibration system for a mass airflow sensor of claim 1, wherein, The gas in the standard gas source (4) is propane gas with a purity greater than 99.5%, and a gas concentration detection alarm instrument is arranged between the standard gas source (4) and the nozzle flowmeter (1).

5. The online detection and calibration system for a mass airflow sensor of claim 1, wherein, The gas analyzer (3) is provided with a plurality of gas analyzers (3), and the plurality of gas analyzers (3) are uniformly arranged at the outlet end of the intake flowmeter (2).

6. The online detection and calibration system for a mass airflow sensor of claim 1, wherein, The inner wall of the intake pipeline (5) is formed with a spiral flow channel to reduce the turbulent flow of the gas inside the intake pipeline (5).

7. An online flowmeter verification system according to any one of claims 1-6, wherein, The intake pipeline (5) is formed by splicing a plurality of ceramic composite steel pipes, and the plurality of ceramic composite steel pipes are fixed by flanges.

8. An online flowmeter verification system according to any one of claims 1-6, wherein, It also includes a control module, the control module includes: PLC controller, for controlling the nozzle flowmeter (1), the intake flowmeter (2) and the gas analyzer (3) work; Data acquisition card, for collecting data in the nozzle flowmeter (1), the intake flowmeter (2) and the gas analyzer (3); Terminal control module, for displaying and processing the data collected by the data acquisition card.

9. An online flowmeter verification system according to any one of claims 1-6, wherein, It also includes a data storage module, which is used for recording and storing various parameters of system operation.

10. An online flowmeter verification system according to any one of claims 1-6, wherein, It also includes a wireless communication module, which is used for remotely transmitting the measurement data of the nozzle flowmeter (1), the intake flowmeter (2) and the gas analyzer (3) to the remote control center, and the wireless communication module supports multiple communication protocols, including but not limited to TCP / IP, Bluetooth and Zigbee.

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