Air inlet resistance testing system

Abstract

The invention provides an air inlet resistance testing system which comprises a uniform flow pipeline communicated with a tested pipeline; the fan is communicated with the flow uniformizing pipeline and is used for uniformizing the flow of the medium in the detected pipeline and continuously pumping out the medium; the frequency converter is used for adjusting the air volume of the fan; the flow velocity measurement module is used for collecting flow velocity data in the uniform flow pipeline; the pressure measuring module is used for collecting pressure data in the uniform flow pipeline; the temperature measuring module is used for collecting temperature data in the uniform flow pipeline; and the calculation display module is used for determining an air inlet resistance test result of the tested pipeline based on the flow velocity data, the pressure data and the temperature data, and displaying the air inlet resistance test result. The air volume of the fan is adjusted through the frequency converter, equipment for adjusting the air inlet volume under the actual use condition is simulated, and the air inlet resistance of the tested pipeline is tested.

Description

Technical Field

[0001] The present invention relates to the technical field of resistance testing, and particularly to an intake resistance testing system. Background Art

[0002] In large marine engines or turbines, several engines may be operating. The intake air volume of each engine may vary, and variables such as wind pressure, temperature, and air flow velocity corresponding to different intake air volumes will affect the performance, shape, and material of the external devices of the intake pipeline. Therefore, it is necessary to design a simulation test system to simulate the equipment for adjusting the intake air volume under actual use conditions to complete the intake resistance test. Summary of the Invention

[0003] In view of this, it is necessary to provide an intake resistance testing system to achieve the purpose of simulating the equipment for adjusting the intake air volume under actual use conditions to complete the intake resistance test.

[0004] To achieve the above object, the present invention provides an intake resistance testing system, including:

[0005] A uniform flow pipeline, which is communicated with the pipeline to be measured;

[0006] A fan, which is communicated with the uniform flow pipeline and is used for uniformly flowing the medium in the pipeline to be measured and continuously extracting it;

[0007] A frequency converter, which is used for adjusting the air volume of the fan;

[0008] A flow velocity measurement module, which is used for collecting the flow velocity data in the uniform flow pipeline;

[0009] A pressure measurement module, which is used for collecting the pressure data in the uniform flow pipeline;

[0010] A temperature measurement module, which is used for collecting the temperature data in the uniform flow pipeline;

[0011] A calculation and display module, which is used for determining the intake resistance test result of the pipeline to be measured based on the flow velocity data, the pressure data, and the temperature data, and displaying the intake resistance test result.

[0012] Further, the intake resistance testing system further includes: a first mounting bracket for fixing the pipeline to be measured, and a second mounting bracket for fixing the uniform flow pipeline. Both the first mounting bracket and the second mounting bracket are telescopic mounting brackets.

[0013] Further, the intake resistance testing system further includes: a first flange and a second flange; the first flange is fixed at one end of the pipeline to be measured, the second flange is fixed at one end of the uniform flow pipeline, and the first flange is connected to the second flange.

[0014] Further, both the first flange and the second flange are socket flanges.

[0015] Further, the first flange and the second flange are fixed by tightening with bolts.

[0016] Further, one end of the first flange and the measured pipeline is fixedly connected by adhesion. A first sealing ring is arranged at the connection between the first flange and the measured pipeline. One end of the second flange and the flow equalizing pipeline is fixedly connected by adhesion. A second sealing ring is arranged at the connection between the second flange and the flow equalizing pipeline.

[0017] Further, both the first sealing ring and the second sealing ring are nitrile rubber sealing rings.

[0018] Further, the flow velocity measurement module includes a flow velocity sensor for collecting the flow velocity data in the flow equalizing pipeline and a first measurement transmitter. The flow velocity sensor is communicatively connected to the calculation and display module through the first measurement transmitter;

[0019] The pressure measurement module includes a pressure sensor for collecting the pressure data in the flow equalizing pipeline and a second measurement transmitter. The pressure sensor is communicatively connected to the calculation and display module through the second measurement transmitter;

[0020] The temperature measurement module includes a temperature sensor for collecting the temperature data in the flow equalizing pipeline and a third measurement transmitter. The temperature sensor is communicatively connected to the calculation and display module through the third measurement transmitter.

[0021] Further, the flow velocity sensor, the pressure sensor, and the temperature sensor are all insertion sensors.

[0022] Further, the fan is a centrifugal fan.

[0023] The beneficial effects of adopting the above implementation method are as follows: The intake resistance test system provided by the present invention is composed of a flow equalizing pipeline, a measured pipeline, a fan, a frequency converter, a flow velocity measurement module, a pressure measurement module, a temperature measurement module, and a calculation and display module. The air volume of the fan is adjusted through the frequency converter to simulate the adjustment and control of the air consumption of different numbers of diesel engines during operation. Data is collected through the flow velocity measurement module, the pressure measurement module, and the temperature measurement module, and the calculation and display module performs data processing, analysis, and result display. An equipment for adjusting the intake air volume under actual use conditions is simulated to complete the test of the intake resistance of the measured pipeline. Description of the Drawings

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0025] Figure 1 It is a schematic structural diagram of an embodiment of the intake resistance test system provided by the present invention;

[0026] Figure 2 It is a schematic structural diagram of another embodiment of the intake resistance test system provided by the present invention;

[0027] Figure 3 It is a schematic structural diagram of the flow rate measurement module provided by the present invention;

[0028] Figure 4 It is a schematic structural diagram of the pressure measurement module provided by the present invention;

[0029] Figure 5 It is a schematic structural diagram of the temperature measurement module provided by the present invention;

[0030] Figure 6 It is a schematic installation diagram of the temperature sensor provided by the present invention. Specific embodiments

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present invention.

[0032] In the description of the embodiments of the present application, unless otherwise specified, the meaning of "a plurality" is two or more.

[0033] In the embodiments of the present invention, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, device, product or equipment that includes a series of steps or modules does not necessarily have to be limited to those clearly listed steps or modules, but may include other steps or modules that are not clearly listed or are inherent to these processes, methods, products or equipment.

[0034] In the embodiments of the present invention, the naming or numbering of steps does not mean that the steps in the method flow must be executed in the time / logical sequence indicated by the naming or numbering. The named or numbered process steps can be changed in the execution order according to the technical purpose to be achieved, as long as the same or similar technical effects can be achieved.

[0035] Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present invention. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0036] The present invention provides an intake resistance test system, as Figure 1 and Figure 2 shown. The intake resistance test system includes:

[0037] A uniform flow pipeline 101, which is communicated with the pipeline 102 to be measured;

[0038] A fan 103, which is communicated with the uniform flow pipeline 101 and is used for uniformly flowing and continuously extracting the medium in the pipeline 102 to be measured through the uniform flow pipeline 101;

[0039] An inverter 104, which is electrically connected to the fan 103 and is used for controlling the operation of the fan 103 and adjusting the air volume of the fan 103;

[0040] A flow velocity measurement module 109, which is used for collecting the flow velocity data in the uniform flow pipeline 101;

[0041] A pressure measurement module 110, which is used for collecting the pressure data in the uniform flow pipeline 101;

[0042] A temperature measurement module 111, which is used for collecting the temperature data in the uniform flow pipeline 101;

[0043] A calculation and display module 106, which is respectively communicatively connected to the flow velocity measurement module 109, the pressure measurement module 110, and the temperature measurement module 111, and is used for determining the intake resistance test result of the pipeline 102 to be measured based on the flow velocity data, the pressure data, and the temperature data, and displaying the intake resistance test result.

[0044] It can be understood that the system provided by the present invention can simulate the adjustment and control of the air consumption of different numbers of diesel engines during operation, monitor the operating parameters, and measure the gas parameters and environmental parameters of the intake resistance during the operation of the test components.

[0045] The functional characteristics achieved by the system provided by the present invention include: real-time and efficient measurement of the flow velocity, pressure, and temperature of the medium in the pipeline; using a flow-equalizing pipeline 101 to rectify the airflows of the fan 103 and the pipeline 102 to be measured, making the airflows at the outlet of the pipeline 102 to be measured stable, which can improve the accuracy of the measured air pressure; the fan 103 is divided into gears to simulate the adjustment and control of the air consumption of different numbers of diesel engines during operation, and monitor the operating parameters; the measurement results support being exported as a parsable result file; the user interface is friendly: the interface is concise, clear, and easy to operate.

[0046] The overall solution of this scheme adopts a modular design, which is convenient for replacing different components, among which:

[0047] The flow-equalizing pipeline 101 is connected to the fan 103 through a sleeve joint 107, the frequency converter 104 is connected to the calculation and display module 106 through a control cabinet 105, and the flow-equalizing pipeline 101 and the pipeline 102 to be measured are connected through a pipeline joint 108. The pipeline joint 108 includes a first flange 1081 and a second flange 1082.

[0048] The control cabinet 105 includes a three-phase AC power supply 1051, a non-fuse breaker or a leakage breaker 1052, an electromagnetic contactor 1053, an AC reactor 1054, and an input-side noise filter 1055 connected in series in sequence. The control cabinet 105 also includes a braking resistor 1056 and a braking unit 1057 connected in series. Both the braking unit 1057 and the input-side noise filter 1055 are connected to the frequency converter 104.

[0049] The fan 103 and the frequency converter 104: The flow rate of the fan 103 can be steplessly adjusted in the range of 0 - 7m 3 / s; the maximum vacuum degree is 4 kPa. Select a suitable frequency converter 104 to frequency-convert the motor to control the flow rate of the fan 103, and the flow rate of the fan 103 can be adjusted according to the usage requirements. The frequency converter 104 selects a high-performance current vector frequency converter 104. The frequency converter 104 is mainly used to frequency-convert the motor of the fan 103, and the motor drives the blades of the fan 103 to rotate through a belt to adjust the air volume of the fan 103.

[0050] Uniform flow pipeline 101: The function of the uniform flow pipeline 101 is to rectify the flow field, provide an environment with a stable flow velocity for the fluid to be measured, ensure the accuracy of the environmental parameters of the fluid to be measured, and the fluid to be measured can be a gas. The uniform flow pipeline 101 of the system provided by the present invention is made of 304 stainless steel. First, the length is designed to be 3000 mm respectively, the wall thickness of the pipe wall is designed to be 6 mm, and the CFD (Computational Fluid Dynamics) numerical simulation method is used to perform flow field simulations under different conditions to find the position where the gas flow field in the uniform flow pipeline 101 reaches uniform and stable, so as to facilitate the layout and installation of sensors and the depth of the probe inserted into the pipeline. Through simulation, the length of the uniform flow pipeline 101 is determined to be 3.0 m. The pipe joints can be connected by flange plates.

[0051] The function of the uniform flow pipeline 101 is to rectify the flow field, provide an environment with a stable flow velocity for the fluid to be measured, and ensure the accuracy of the environmental parameters of the fluid to be measured. The uniform flow pipeline 101 of this system is made of 304 stainless steel, the length is designed to be 3000 mm, the wall thickness of the pipe wall is designed to be 6 mm, and the CFD numerical simulation method is used to perform flow field simulations under different conditions to find the position where the gas flow field in the uniform flow pipeline 101 reaches uniform and stable, so as to facilitate the layout and installation of sensors and the depth of the probe inserted into the pipeline. Through simulation, the length of the uniform flow pipeline 101 is determined to be 3.0 m.

[0052] Monitoring and testing center: The monitoring and testing center is composed of a flow velocity measurement module 109, a pressure measurement module 110, a temperature measurement module 111, and a calculation and display module 106.

[0053] The calculation and display module 106 integrates the self-check algorithms of each sensor, the judgment algorithms for the readings of each sensor to be stable, the judgment algorithms for the stable state of the pipeline flow field, the judgment algorithms for entering the measurement state, and the calculation algorithms for the flow resistance characteristics of the pipeline 102 to be measured, and can obtain the intake resistance during the operation of the test component more quickly and accurately. In addition, it can collect and record parameters such as pressure, flow velocity, and temperature.

[0054] There is a power supply in the system. The power supply is three-phase AC380V, 50Hz. The total average power consumption of the system is not greater than 50kW, and the peak power consumption is not higher than 75kW.

[0055] To ensure the convenience of system installation, disassembly and debugging, the connection between the pipeline 102 to be measured and the uniform flow pipeline 101 is connected by two flange plates. The flange plates are directly bonded to the pipeline by socket flange.

[0056] The overall working principle of the intake resistance test system is as follows:

[0057] The frequency converter 104 is used to vary the frequency of the motor that controls the blades of the blower 103. The motor drives the blades of the blower 103 to rotate through a belt to adjust the air volume of the blower 103, so as to simulate the adjustment and control of the air consumption of different numbers of diesel engines. It extracts the medium in the measured pipeline 102 through a suction method, makes the medium uniform through the flow equalizing pipeline 101, and continuously extracts it. At this time, the pressure, flow rate, and temperature measurement module 111 installed on the flow equalizing pipeline 101 collects the pressure, flow rate, and temperature data of the medium and transmits them to the calculation and display module 106 of the monitoring and testing center through a measurement transmitter. The calculation and display module 106 of the monitoring and testing center analyzes the received data and calculates the flow resistance characteristics, that is, the intake resistance, of the medium in the measured pipeline 102 according to relevant algorithms. In addition, the intake resistance test system can also be provided with an environmental parameter measurement device to monitor changes in the test environment.

[0058] The specific design of each component of the system is as follows:

[0059] The main components of this equipment mainly include a blower 103, a flow equalizing pipeline 101, a measurement module (a flow rate, temperature, pressure, temperature, and atmospheric pressure integrated sensor), a calculation and display module 106, a mounting bracket, etc.

[0060] Fluid simulation results: Under the conditions of a pipeline standard DN400, a wall thickness of 6 mm, and an outlet flow rate of 7 m3 / s, simulations were carried out to obtain the distribution diagrams of the gas pressure and flow rate inside the pipeline.

[0061] The simulation results show that after the rectification of the flow equalizing pipeline 101, the pressure and flow rate distributions at the end of the pipeline are uniform, without obvious and multi-data stratification, and the transition is uniform.

[0062] In some embodiments, as Figure 2 shown, the intake resistance test system further includes: a first mounting bracket 112 for fixing the measured pipeline 102, and a second mounting bracket 113 for fixing the flow equalizing pipeline 101. Both the first mounting bracket 112 and the second mounting bracket 113 are telescopic mounting brackets.

[0063] It can be understood that the first mounting bracket 112, that is, the mounting bracket for the measured pipeline 102: The mounting bracket for the measured pipeline 102 in this system is designed as a telescopic mounting bracket. The size of the telescopic mounting bracket is designed to be 2000 mm (length) x 2000 mm (width) x 2000 mm (height). The bracket is made of stainless steel and is fixed and connected with special connectors.

[0064] The mounting bracket for the pipeline 102 to be measured adopts a telescopic bracket, ensuring that the height is adjustable, the height is flexibly variable, and it is also convenient to match the height of the air suction port of the fan 103; the support bracket for the flow equalizing pipeline 101 also adopts a telescopic bracket, which is convenient to match the installation height of the pipeline 102 to be measured. In addition, the components should be arranged according to the requirements of the test system, and a safety passage should be reserved during the working process to ensure the safety of the staff.

[0065] Due to the large size of the load and its tooling, the large bearing load, and at the same time, it is necessary to take into account the machining performance of large-sized parts and the safety distance of the operator during work. Considering that the length of the pipeline to be measured for bending is 2.4 m and the height of the fan 103 selected for this system is 1673 mm, in order to ensure the convenient installation, disassembly and maintenance of each device and component in the system, the mounting bracket for the pipeline 102 to be measured in this system is designed as a telescopic mounting bracket. The size of the telescopic mounting bracket is designed as 2000 mm (length) x 2000 mm (width) x 2000 mm (height). The bracket is made of stainless steel and fixed and connected with special connectors.

[0066] The base of the bracket is symmetrically installed and fixed with four bolts and gaskets. The platform above the support bracket is used to install pipelines and other devices. Grooves and through holes are provided on the support platform to set up tooling fixtures. The pipeline 102 to be measured is fixed on the mounting bracket with a clamp; a safety passage distance of one meter is reserved around the mounting bracket to ensure the safety of the staff.

[0067] The ANSYS (finite element analysis software) is used to conduct a stress analysis on the three-dimensional model of the bracket. A vertical load of 3920 N (400 Kg) is applied to the upper surface of the bracket. The analysis shows that the maximum stress is 7 Mpa. The material of the bracket is stainless steel, and its yield point stress is 205 Mpa. According to the formula: safety factor = yield point stress / working or design stress, that is, safety factor = 205 / 7 = 29.29, which is much greater than 1. The bracket can bear a load intensity far greater than 400 Kg.

[0068] In some embodiments, the intake resistance test system further includes: a first flange 1081 and a second flange 1082; the first flange 1081 is fixed to one end of the pipeline 102 to be measured, the second flange 1082 is fixed to one end of the flow equalizing pipeline 101, and the first flange 1081 is connected to the second flange 1082.

[0069] In some embodiments, both the first flange 1081 and the second flange 1082 are socket flanges.

[0070] In some embodiments, the first flange 1081 and the second flange 1082 are fixed by tightening with bolts.

[0071] In some embodiments, one end of the first flange 1081 and the pipeline under test 102 are fixedly connected by adhesion. A first sealing ring is provided at the connection between the first flange 1081 and the pipeline under test 102. And one end of the second flange 1082 and the flow equalizing pipeline 101 are fixedly connected by adhesion. A second sealing ring is provided at the connection between the second flange 1082 and the flow equalizing pipeline 101. Both the first sealing ring and the second sealing ring are nitrile rubber sealing rings.

[0072] It can be understood that the pipeline joint adopts a flange joint (flange) with adjustable opening. The opening of the joint is adjusted by the inner diameter size of the pipeline under test 102 to make the inner diameter sizes of the flow equalizing pipeline 101 and the pipeline under test 102 consistent.

[0073] The pipeline joint is used to connect the pipeline under test 102 and the flow equalizing pipeline 101 with a fixed diameter of DN400. To ensure the smoothness of the outlet air flow of the pipeline section under test and the accuracy of the test air pressure, the diameter of the pipeline under test 102 connected by the joint covers all pipelines within the specification of DN400mm.

[0074] According to GB9119, select appropriate flanges, and tighten and fix the two flanges with bolts; for the convenience of installation and disassembly of each component of the system, the flanges and the two pipelines are directly adhered, and after adhesion, a special sealant is used for sealing at the connection.

[0075] To ensure the convenience of equipment installation and disassembly, the pipeline and the flange are directly bonded. In addition to the surface-to-surface adhesion, the outer ring should be sealed again at the connection.

[0076] For the connection of the flanges, first perform mechanical treatment on the two sides of the pipeline. Commonly used manual tools for mechanical treatment include wire brushes, copper wire brushes, scrapers, sandpapers, pneumatic tools, etc.; mechanical methods include turning, planing, grinding with a grinding wheel, sandblasting, etc. Using mechanical methods to treat the surface provides appropriate roughness for the surface, increases the effective bonding area, and improves the bonding performance.

[0077] For the sealing of the surface-to-surface bonding, both the flange and the pipeline are made of stainless steel. Therefore, HT-109 metal glue is used for bonding. This is a high-strength glue for bonding metals. HT-109 special metal glue is developed by an advanced process and can quickly bond various metal materials such as steel, iron, aluminum, titanium, stainless steel, etc. at room temperature (25°C).

[0078] For the sealing of the bonding, nitrile rubber sealing rings are used: they are resistant to oil, heat, and have good wear resistance. They are widely used for making sealing products, applicable to -40~120°C, used for making "O" rings, and applicable to general hydraulic and pneumatic systems.

[0079] In some embodiments, such as Figure 3 , Figure 4 and Figure 5 shown, the flow rate measurement module 109 includes a flow rate sensor 1091 for collecting flow rate data in the uniform flow pipeline 101 and a first measurement transmitter 1092. The flow rate sensor 1091 is communicatively connected to the calculation and display module 106 through the first measurement transmitter 1092;

[0080] The pressure measurement module 110 includes a pressure sensor 1101 for collecting pressure data in the uniform flow pipeline 101 and a second measurement transmitter 1102. The pressure sensor 1101 is communicatively connected to the calculation and display module 106 through the second measurement transmitter 1102;

[0081] The temperature measurement module 111 includes a temperature sensor 1111 for collecting temperature data in the uniform flow pipeline 101 and a third measurement transmitter 1112. The temperature sensor 1111 is communicatively connected to the calculation and display module 106 through the third measurement transmitter 1112.

[0082] The first measurement transmitter 1092, the second measurement transmitter 1102, and the third measurement transmitter 1112 are also connected to the power supply 114.

[0083] In some embodiments, the flow rate sensor 1091, the pressure sensor 1101, and the temperature sensor 1111 are all plug-in sensors.

[0084] It can be understood that the flow rate sensor 1091 and the first measurement transmitter 1092 constitute the flow rate measurement module 109; the pressure sensor 1101 and the second measurement transmitter 1102 constitute the pressure measurement module 110; the temperature sensor 1111 and the third measurement transmitter 1112 constitute the temperature measurement module 111. Each measurement module shares a set of monitoring and testing centers, and each component is connected through a data line or a cable. The process schematic diagram of the connection of each measurement module is as shown in Figure 3 , Figure 4 and Figure 5 shown.

[0085] Pressure sensor 1101 and flow rate sensor 1091: The split Pitot tube inserted pressure sensor 1101 and flow rate sensor 1091 are selected for this system. When installing the flow rate sensor 1091, first drill a hole in the pipeline to be measured and then install the sensor. Leave a straight pipe diameter of 5 times the pipe diameter before and after the Pitot tube. The sensor complies with the Modbus communication protocol, adopts the RTU mode in the subset of the Modbus protocol, and the RS485 half-duplex working mode. The sensor outputs RS485 signal, adopts the standard Modbus-RTU protocol, the response frequency ≤ 5Hz, and the response speed ≥ 10ms.

[0086] Temperature sensor 1111: The PT100 inserted temperature sensor 1111 is selected for this system. The temperature sensor 1111 is a PT100 sensor that generates a resistance effect under the influence of temperature. After being converted by a dedicated processing unit, a differential voltage signal is generated. This signal is amplified by a dedicated amplifier to convert the signal relative to the range into a standard analog or digital signal. The sensor has wide voltage power supply, non-linear correction, high precision, small size, light weight, convenient installation, anti-motor and cut-off frequency interference design, and strong anti-interference ability; the sensor has the functions of reverse wiring protection and overvoltage protection, current limiting protection; the measurement accuracy of the sensor is high: the measurement range of the temperature sensor 1111 is -50 to 100 °C, and the accuracy is 0.25% F.S; the material of the temperature sensor 1111 is mainly 304 stainless steel, the material is corrosion-proof and waterproof, and the protection level is IP65.

[0087] When installing the temperature sensor 1111, first drill a hole in the pipeline to be measured and then install the sensor, making the installation and replacement more convenient. The installation schematic diagram is as Figure 6 shown.

[0088] The temperature sensor 1111 complies with the Modbus communication protocol, adopts the RTU mode in the subset of the Modbus protocol, the RS485 half-duplex working mode, outputs RS485 signal, adopts the standard Modbus-RTU protocol, the resolution is 0.1 °C, the response frequency ≤ 5Hz, and the response speed ≥ 10ms.

[0089] In some embodiments, the blower 103 is a centrifugal blower 103.

[0090] It can be understood that the working principle of the blower 103 is to supply power to the equipped motor through a three-phase AC380V power supply. After the motor starts, it drives the belt drive to drive the impeller of the blower 103 to rotate. In addition, a suitable frequency converter 104 is selected to frequency-convert the motor to control the flow rate of the blower 103. The flow rate of the blower 103 can be divided into four gears, with an interval of about 1.7 m3 / s for each gear.

[0091] Selection basis of the fan 103: The in-duct air velocity range of the diesel engine's intake air duct is usually between 10 m / s and 30 m / s. The specific value depends on factors such as the power, rotational speed of the diesel engine, and the design of the intake air system. This system simulates the adjustment and control of the air consumption of different numbers of diesel engines working, and selects the upper limit value of the in-duct air velocity, that is, 30 m / s as the calculated value; in addition, the pipe diameter is 0.5 m.

[0092] According to the following formula:

[0093] Q = VS (1)

[0094] Where, Q represents the medium flow rate, V represents the medium flow velocity, and S represents the cross-sectional area of the medium flowing through the pipe;

[0095] S = πR 2 (2)

[0096] Substituting the relevant values, the medium flow rate can be obtained as approximately 5.89 m 3 / s. For the convenience of selecting the fan 103, the calculated medium flow rate is rounded up to 6 m 3 / s. When the in-duct air velocity range is between 10 m / s and 30 m / s, the vacuum degree needs to be greater than or equal to 4 kPa.

[0097] Based on the above basis, the centrifugal fan 103 is selected for the fan 103, which has the following characteristics:

[0098] Adopts an advanced L-shaped backward-curved impeller design, with high efficiency;

[0099] Repeatedly optimized by CFD flow field, with a wide high-efficiency area and no overload;

[0100] The impeller of the fan 103 is designed to be extractable, which is extremely convenient for maintenance;

[0101] Fully welded with steel continuously, with high strength and no leakage;

[0102] Belt-driven, adjustable on-site;

[0103] The flow rate of the fan 103 can reach 6 m 3 / s;

[0104] The vacuum degree of the fan 103 is 4 kPa;

[0105] The rotational speed of the fan blade of the fan 103 is about 1850 r / min;

[0106] The weight range of the fan 103 is about 842 kg;

[0107] It is equipped with a motor with a power of 37 kw, a voltage of 380 V, and a frequency conversion range of 5 - 50 Hz.

[0108] In summary, the intake resistance test system provided by the present invention includes: a uniform flow pipeline 101, which is connected to the pipeline 102 to be measured; a fan 103, which is connected to the uniform flow pipeline 101 and is used to uniformly flow and continuously extract the medium in the pipeline 102 to be measured through the uniform flow pipeline 101; a frequency converter 104, which is electrically connected to the fan 103 and is used to control the operation of the fan 103 and adjust the air volume of the fan 103; a flow velocity measurement module 109, which is used to collect the flow velocity data in the uniform flow pipeline 101; a pressure measurement module 110, which is used to collect the pressure data in the uniform flow pipeline 101; a temperature measurement module 111, which is used to collect the temperature data in the uniform flow pipeline 101; a calculation and display module 106, which is communicatively connected to the flow velocity measurement module 109, the pressure measurement module 110, and the temperature measurement module 111 respectively, and is used to determine the intake resistance test result of the pipeline 102 to be measured based on the flow velocity data, the pressure data, and the temperature data, and display the intake resistance test result.

[0109] The system provided by the present invention is composed of a uniform flow pipeline 101, a pipeline 102 to be measured, a fan 103, a frequency converter 104, a flow velocity measurement module 109, a pressure measurement module 110, a temperature measurement module 111, and a calculation and display module 106. The air volume of the fan 103 is adjusted by the frequency converter 104 to simulate the adjustment and control of the air consumption of different numbers of diesel engines. Data is collected by the flow velocity measurement module 109, the pressure measurement module 110, and the temperature measurement module 111, and the data is processed, analyzed, and the result is displayed by the calculation and display module 106. It simulates the equipment for adjusting the intake air volume under actual use conditions and completes the test of the intake resistance of the pipeline 102 to be measured.

[0110] The system provided by the present invention has the following beneficial effects:

[0111] (1) It has rich functions and can measure a lot of data, including information such as gas pressure, flow velocity, flow rate, and temperature in the pipeline;

[0112] (2) It realizes stepless adjustment of the air volume;

[0113] (3) Good applicability: It includes all pipelines 102 to be measured with diameters within DN400;

[0114] (4) Stable air flow: The gas density distribution is uniform, the air volume difference at each cross-section of the pipeline is small, and a very stable wind resistance characteristic is formed at the end of the pipeline 102 to be measured;

[0115] (5) Large adjustable air volume: The maximum air volume can reach 7 m / s, and the adjustable range is 0 - 7 m / s;

[0116] (6) Good sealing performance: The pipeline is connected by flanges and sealed with sealant.

[0117] (7) Good corrosion resistance and durability: The overall material is made of 304 stainless steel.

[0118] The above has introduced the intake resistance test system provided by the present invention in detail. Specific examples are used in this article to expound the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. An intake resistance test system, characterized in that, Including: A uniform flow pipeline, which is connected to the pipeline to be measured; A fan, which is connected to the uniform flow pipeline and is used to uniformly flow and continuously extract the medium in the pipeline to be measured; A frequency converter, which is used to adjust the air volume of the fan; A flow velocity measurement module, which is used to collect the flow velocity data in the uniform flow pipeline; A pressure measurement module, which is used to collect the pressure data in the uniform flow pipeline; A temperature measurement module, which is used to collect the temperature data in the uniform flow pipeline; A calculation and display module, which is used to determine the intake resistance test result of the pipeline to be measured based on the flow velocity data, the pressure data and the temperature data, and display the intake resistance test result.

2. The intake resistance test system according to claim 1, characterized in that, It also includes: A first mounting bracket for fixing the pipeline to be measured and a second mounting bracket for fixing the uniform flow pipeline. Both the first mounting bracket and the second mounting bracket are telescopic mounting brackets.

3. The intake resistance test system according to claim 1, wherein It also includes: A first flange and a second flange; the first flange is fixed to one end of the pipeline to be measured, the second flange is fixed to one end of the uniform flow pipeline, and the first flange is connected to the second flange.

4. The intake resistance test system according to claim 3, wherein, Both the first flange and the second flange are socket flanges.

5. The intake resistance test system according to claim 3, characterized in that, The first flange and the second flange are fixed by tightening with bolts.

6. The intake resistance test system according to claim 3, characterized in that The first flange is fixedly connected to one end of the pipeline to be measured by adhesion. A first sealing ring is arranged at the connection between the first flange and the pipeline to be measured. And the second flange is fixedly connected to one end of the uniform flow pipeline by adhesion. A second sealing ring is arranged at the connection between the second flange and the uniform flow pipeline.

7. The intake resistance test system according to claim 6, wherein Both the first sealing ring and the second sealing ring are nitrile rubber sealing rings.

8. The intake resistance test system according to claim 1, wherein The flow velocity measurement module includes a flow velocity sensor for collecting the flow velocity data in the uniform flow pipeline and a first measurement transmitter. The flow velocity sensor is communicatively connected to the calculation and display module through the first measurement transmitter; The pressure measurement module includes a pressure sensor for collecting the pressure data in the uniform flow pipeline and a second measurement transmitter. The pressure sensor is communicatively connected to the calculation and display module through the second measurement transmitter; The temperature measurement module includes a temperature sensor for collecting the temperature data in the uniform flow pipeline and a third measurement transmitter. The temperature sensor is communicatively connected to the calculation and display module through the third measurement transmitter.

9. The intake resistance test system according to claim 8, wherein, The flow velocity sensor, the pressure sensor and the temperature sensor are all insertion-type sensors.

10. The intake resistance test system according to any one of claims 1-9, characterized in that, The fan is a centrifugal fan.

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