Air duct system test platform with high-precision and uniform air volume and operation method

Abstract

The invention discloses an air pipe system test platform with high-precision and uniform air volume and an operation method, the air pipe system test platform comprises a frequency conversion fan and a soft connecting piece, one end of the soft connecting piece far away from the frequency conversion fan is fixedly connected with a steady flow air pipe, and one end of the steady flow air pipe far away from the soft connecting piece is provided with a test air pipe. The test air pipe comprises a main air pipe, a branch air pipe assembly and a smoke generator, and the air volume test assembly is detachably connected to the test air pipe. According to the invention, air leakage quantity testing can be carried out on air pipe sections made of different materials, and air pipe air supply quantity uniformity testing can be carried out on air valves of different types, air pipe sparse joints in different connection forms with a main air pipe, reducer pipes of different positions and angles and air ports of different types; according to the air duct system combination scheme with the high-precision and uniform air volume, the deviation between the actual measurement value and the design value of the air outlet air volume of the air port is controlled to be 3%-5%, and reference is provided for engineering construction, particularly air duct materials and part type selection in large scientific device construction projects.

Description

Technical Field

[0001] The invention belongs to the technical field of air volume uniformity control of an air duct system, and in particular relates to an air duct system test platform with high-precision and uniform air volume and an operation method thereof. Background Art

[0002] Uniform air supply means that the ventilation system and air conditioning ducts evenly deliver the same amount of air along the holes or short pipes on the side walls of the ducts, so that the air supply space can obtain uniform air distribution. The uniformity of air supply in the air conditioning supply duct is one of the important factors affecting the temperature field, humidity field, concentration field and indoor comfort. In general, the uniformity requirement of the air supply system is that the deviation between the actual measured value and the design value of the air outlet volume is controlled at about 15%. For some large scientific device projects, there are strict process requirements in the underground tunnel, and the temperature gradient fluctuation must be less than 0.1℃ / 5m. The uniformity of the air supply of the duct plays a key role in the realization of high-precision constant temperature in the tunnel. Therefore, it is necessary to select a duct air supply system with high-precision and uniform air volume. In order to better achieve the uniformity of air supply in the duct system, the material of the duct, the position and angle of the reducer, the connection form of the duct joint, and the selection of the air valve and tuyere type are very critical. Once the material of the air duct, the connection form of the air duct joint, the position and angle of the reducer, the type of air valve and air outlet are not properly selected, it will lead to the air volume uniformity of the air duct system being difficult to meet the requirements, especially for precision engineering. It will be difficult to rectify the air duct air supply system after installation. However, there is currently no air duct system test platform that can test the leakage of air ducts of different materials, different types of air valves, air duct joints with different connection forms to the main air duct, reducers at different positions and angles, and different types of air outlets. Test the air supply volume uniformity of the air duct, and then select a combination of air duct systems with high-precision and uniform air volume, and control the deviation between the actual measured value and the design value of the air outlet air volume within 3-5%, providing a reference for the selection of air duct materials and components in engineering construction, especially large scientific equipment construction projects. Summary of the invention

[0003] The main purpose of the present invention is to provide a duct system test platform and an operation method with high-precision and uniform air volume, which can solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a high-precision and uniform air volume duct system test platform, which is composed of a variable frequency fan, a steady flow duct, a test duct, and an air volume test component.

[0005] The port of the variable frequency fan is fixedly connected with a soft connector, one end of the soft connector away from the variable frequency fan is fixedly connected with a steady flow air duct, and one end of the steady flow air duct away from the soft connector is connected with a test air duct.

[0006] The test air duct comprises a main air duct, a branch air duct assembly and a smoke generator, and the air volume test assembly is detachably connected to the test air duct.

[0007] Preferably, the main air duct includes multiple groups of air supply sections and multiple reducers along its length direction, and the cross-sectional areas of the air supply sections decrease successively in the air flow direction of the main air duct.

[0008] Preferably, the smoke generator is installed at the front and rear ends of the main air duct, and a particle trap is provided outside the main air duct to check the sealing effect of the main air duct.

[0009] The branch air duct assembly comprises an air duct joint, an air valve, a connecting pipe and an air outlet.

[0010] Preferably, the air duct joint is detachably connected to the outer wall of the main air duct, the air duct joint is communicated with the main air duct, an air valve is detachably connected to the air duct joint, an end of the air valve away from the main air duct is connected to a connecting pipe, and an air outlet is provided on the connecting pipe.

[0011] Preferably, the connection between the main air duct and the air duct section adopts a Y-shaped arc tee or a guide + T-shaped tee or a T-shaped 45° tee.

[0012] The air volume test assembly comprises a mobile platform, the upper side of the mobile platform is fixedly connected with a test air duct, a wind speed sensor is arranged in the test air duct, and a display screen is arranged on the outer wall of the test air duct.

[0013] Preferably, the display screen includes a data input module for inputting the design value of the air outlet volume. The data input module and the wind speed sensor are connected to a data acquisition module by telecommunication, and the data acquisition module is connected to a data processing module by telecommunication, and the data processing module is connected to the display screen by telecommunication. The air volume test component is connected to the test air duct, and the design value of the air outlet volume is input on the display screen, and the variable frequency fan is started, and the air supply volume uniformity test of the air duct using different types of air valves, air duct sections with different connection forms to the main pipe, reducers at different positions and angles, and different types of air outlets is gradually tested, and the air outlet volume of the air valve or air outlet on the branch air duct assembly and the deviation of the air valve or air outlet volume from the design value of the air outlet volume are calculated through the data processing module, and these results are displayed on the display screen. The test process is simplified, the complexity of manual operation is reduced, and the test efficiency is improved.

[0014] An operating method of a duct system test platform with high-precision and uniform air volume comprises the following steps:

[0015] Step 1: Based on the air outlet design value and other relevant parameters, the computational fluid dynamics (CFD) numerical simulation method is used to preliminarily determine the length and cross-sectional dimensions of multiple air supply sections of the main air duct, the positions and angles of multiple reducers, and the connection form between the air duct sections and the main air duct.

[0016] Step 2: Make three sections of duct with different materials respectively, and use the air leakage tester to test the air leakage of the duct section. The test method refers to the current GB50243 "Quality Acceptance Code for Ventilation and Air Conditioning Engineering Construction" or JGJ141 "Technical Regulations for Ventilation Ducts" and other relevant specifications. By comparing the air leakage of duct sections with different materials, evaluate the sealing between duct sections with different materials, and obtain the duct material with the smallest air leakage and its connection process.

[0017] Step 3: Based on Step 1 and Step 2, according to the length and cross-sectional dimensions of multiple groups of air supply sections, the positions and angles of multiple reducers, and the connection form of the duct joints and the main duct, select the duct material with the least air leakage, make steady-flow ducts, main ducts, duct joints, connecting pipes, and air volume test components, select appropriate variable-frequency fans and soft connectors, and build a duct system test platform with high-precision and uniform air volume. Use blind plates to block each duct joint, start the smoke generator to detect the sealing of the main duct. If the particle collector cannot detect smoke particles, or the concentration is within a reasonable range, it means that the seal is effective, otherwise the seal needs to be repaired. After confirming the sealing of the main duct, remove the blind plate.

[0018] Step 4: Air volume uniformity test of different types of air valves

[0019] (1) The air duct sections are symmetrically distributed on both sides of the outer wall of the main air duct. The air valve is installed on the air duct section. One end of the test air duct is connected and fixed to the air valve through a mobile platform, and the design value of the air outlet air volume is input on the display screen.

[0020] (2) Start the variable frequency fan and adjust the frequency of the variable frequency fan by observing the pressure gauge on the flow stabilizing tube so that the inlet static pressure value of the test air duct reaches the designed static pressure value.

[0021] (3) Use multiple wind speed sensors on the test air duct to measure the wind speed at the air valve outlet. Through data processing and analysis, the measured air volume of each air valve on both sides of the main air duct and the deviation from the air outlet air volume design value are displayed on the display screen. Adjust the air valve so that the deviation between the air volume of each air valve and the air outlet air volume design value is controlled within the range of 12% to 15%. Repeated tests are performed by replacing different types of air valves to select the air valve with the best air volume uniformity.

[0022] Step 5: Test the air volume uniformity of different connection forms between the air duct section and the main air duct

[0023] (1) After determining the type of air valve, stop the variable frequency fan. Change the connection form between the air duct joint and the main air duct. The connection methods between the main air duct and the air duct joint include Y-type arc tee, diversion + T-type tee, or T-type 45° tee.

[0024] (2) Start the variable frequency fan and measure the air volume of each air valve on both sides of the main air duct and the deviation from the design value of the air volume of the air outlet through the air volume test component, so that the deviation between the air volume of each air valve and the design value of the air volume of the air outlet is controlled within the range of 8% to 10%, and then determine the best connection form between the air duct section and the main air duct.

[0025] Step 6: Air volume uniformity test at different positions and angles of the reducer

[0026] If the deviation between the air volume of each air valve and the air volume design value of the air outlet cannot be controlled within the range of 8% to 10% through steps 4 and 5, change the position and angle of multiple reducers, start the variable frequency fan, and measure the air volume of each air valve on both sides of the main air duct and the deviation from the air volume design value of the air outlet through the air volume test component. Repeat the test to control the deviation between the air volume of each air valve and the air volume design value of the air outlet within the range of 8% to 10%, and determine the position and angle of multiple reducers with the best air volume uniformity.

[0027] Step 7: Air volume uniformity test of different types of air outlets

[0028] (1) After determining the position and angle of the reducer, install different types of air outlets on the air valve through the connecting pipe, and use the mobile platform to connect and fix the end of the test air duct away from the wind speed sensor to the air outlet.

[0029] (2) Start the variable frequency fan, and measure the air volume of each outlet on both sides of the main air duct and the deviation from the design value of the air volume of the outlet through the air volume test component, so that the deviation of the air volume of each outlet from the design value of the air volume of the outlet is controlled within the range of 3% to 5%. Compare the deviation values ​​of the air volume of different forms of air outlets and the design air volume, and find the air outlet with the best air volume uniformity performance.

[0030] Through the gradual screening of the above steps, a combination solution of duct air supply system with high-precision and uniform air volume can be obtained to ensure the uniformity of air volume in precision engineering.

[0031] The present invention provides a duct system test platform and operation method with high-precision and uniform air volume. It has the following beneficial effects:

[0032] (1) The duct system test platform integrates variable frequency fans, steady flow ducts, test ducts and air volume test components. It can accurately measure different types of air valves, duct sections with different connection forms to the main duct, reducers at different positions and angles, and different types of air outlets. Through the setting of multiple wind speed sensors in the air volume test component, the air supply speed of each component in the branch duct assembly is collected in real time, so as to accurately calculate the air volume, greatly improving the precision and accuracy of the test, and then selecting a combination of duct systems with high-precision and uniform air volume to control the deviation of the air outlet air volume from the design value between 3% and 5%.

[0033] (2) The duct system test platform can test the leakage of ducts of different materials, test the uniformity of duct air supply volume for different types of air valves, duct sections with different connection forms to the main duct, reducers at different positions and angles, and different types of air outlets, so as to select duct system combination solutions with high-precision and uniform air volume. This provides a scientific basis for the selection of duct materials and components in engineering construction, helps to optimize the design of the duct system, ensure the uniformity and stability of air supply, and meet the process requirements under specific environments.

[0034] (3) The duct system test platform can automatically receive the data from each wind speed sensor and the input air outlet air volume design value, and organize and store them by integrating the data acquisition module and the data processing module. The data processing module further processes and analyzes these data, calculates the air volume of the air valve or air outlet on the branch duct assembly, and the deviation between the air volume of the air valve or air outlet and the air outlet air volume design value, and displays the results on the display screen, which simplifies the test process, reduces the complexity of manual operation, and improves the test efficiency, making the test process more convenient and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0036] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0037] Figure 2 For the present invention Figure 1 Another perspective view of

[0038] Figure 3 For the present invention Figure 2 Another perspective view of

[0039] Figure 4 It is a schematic diagram of the three-dimensional structure of the air volume test assembly in the present invention;

[0040] Figure 5 For the present invention Figure 2 A in the enlarged view;

[0041] Figure 6 The block diagram of the air volume test of the air duct system test platform of the present invention.

[0042] Description of Figure Numbers:

[0043] 1. Variable frequency fan; 2. Soft connector; 3. Flow-stabilizing air duct; 31. Pressure gauge; 4. Test air duct; 41. Main air duct; 411. Air supply section; 412. Reducer; 42. Branch air duct assembly; 421. Air duct section; 422. Air valve; 423. Connecting pipe; 424. Air outlet; 43. Smoke generator; 5. Air volume test assembly; 51. Mobile station; 52. Test air duct; 53. Wind speed sensor; 54. Display screen.

[0044] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] See also Figure 1-Figure 6 , this embodiment provides the following technical solutions:

[0047] A duct system test platform with high-precision and uniform air volume comprises a variable frequency fan 1, a port of the variable frequency fan 1 is fixedly connected with a flexible connector 2, an end of the flexible connector 2 away from the variable frequency fan 1 is fixedly connected with a steady flow air duct 3, an end of the steady flow air duct 3 away from the flexible connector 2 is provided with a test air duct 4, the test air duct 4 comprises a main air duct 41, a branch air duct assembly 42 and a smoke generator 43, and an air volume test assembly 5 is detachably connected to the test air duct 4.

[0048] In the embodiment of the present invention, a pressure gauge 31 is provided at one end of the steady flow air duct 3 close to the test air duct 4, which is used to measure the static pressure at the inlet of the test air duct. The main air duct 41 includes multiple groups of air supply sections 411 and multiple reducers 412 along its length direction. In the air flow direction of the main air duct 41, the cross-sectional area of ​​the air supply section 411 decreases successively. The smoke generator 43 is arranged at the front and rear ends of the main air duct 41, and a particle catcher is arranged outside the main air duct 41 to check the sealing effect of the main air duct. The branch air duct assembly 42 includes an air duct sparse joint 421, an air valve 422, a connecting pipe 423, and an air outlet 424. The air duct sparse joint 421 is detachably connected to the outer wall of the main air duct 41, the air duct sparse joint 421 is connected to the main air duct 41, the air valve 422 is connected to the air duct sparse joint 421, the end of the air valve 422 away from the main air duct 41 is fixedly connected to the connecting pipe 423, and the air outlet 424 is connected to the connecting pipe 423. The air volume test assembly 5 includes a mobile platform 51, to which a test air duct 52 is fixedly connected, and a wind speed sensor 53 is arranged inside one end of the test air duct 52, which can measure the wind speed data in real time. On the outer wall of the test air duct 52, an intuitive display screen 54 is provided, which is used to display the measured air volume and the deviation between the measured air volume and the design value of the air outlet air volume through data analysis and processing. The end of the test air duct 52 away from the wind speed sensor 53 is docked and fixed with the air valve 422 or the air outlet 424 on the branch air duct assembly 42 through the mobile platform 51, and the design value of the air outlet air volume is input on the display screen 54. The air volume of the air valve 422 or the air outlet 424 and the deviation from the design value of the air outlet air volume can be measured by starting the variable frequency fan 1, and displayed on the display screen 54, so that the test personnel can understand the test situation at a glance.

[0049] In order to better realize an operation method of a duct system test platform with high-precision and uniform air volume, the following steps are included:

[0050] Step 1: Based on the design value of the air outlet air volume and other relevant parameters, the computational fluid dynamics (CFD) numerical simulation method is used to preliminarily determine the length and cross-sectional dimensions of the multiple air supply sections 411 of the main air duct 41, the positions and angles of the multiple reducers 412, and the connection form of the air duct section 421 and the main air duct 41.

[0051] Step 2: Make three sections of duct with different materials respectively, and use the air leakage tester to test the air leakage of the duct section. The test method refers to the current GB50243 "Quality Acceptance Code for Ventilation and Air Conditioning Engineering Construction" or JGJ141 "Technical Regulations for Ventilation Ducts" and other relevant specifications. By comparing the air leakage of duct sections with different materials, evaluate the sealing between duct sections with different materials, and obtain the duct material with the smallest air leakage and its connection process.

[0052] Step 3: On the basis of step 1 and step 2, according to the length and cross-sectional dimensions of the multiple groups of air supply sections 411 of the main air duct 41, the positions and angles of the multiple reducers 412, and the connection form of the air duct joint 421 and the main air duct 41, select the air duct material with the least air leakage, make the steady flow air duct 3, the main air duct 41, the air duct joint 421, the connecting pipe 423, and the air volume test component 5, select the appropriate variable frequency fan 1 and soft connector 2, and build a high-precision and uniform air volume air duct system test platform. Use blind plates to block each air duct joint 421, start the smoke generator 43 to detect the sealing condition of the main air duct 41. If the particle catcher cannot detect smoke particles, or the concentration is within a reasonable range, it means that the seal is effective, otherwise the seal needs to be repaired. After confirming the sealing of the main air duct 41, remove the blind plate.

[0053] Step 4: Air volume uniformity test of different types of air valves

[0054] (1) The air duct joints 421 are symmetrically distributed on both sides of the outer wall of the main air duct 41. The air valves 422 are installed on the air duct joints 421. The end of the test air duct 52 away from the wind speed sensor 53 is connected and fixed to the air valve 422 through the moving platform 51, and the design value of the air outlet air volume is input on the display screen 54.

[0055] (2) Start the variable frequency fan 1, and by observing the pressure gauge 31 on the flow stabilizing tube 3, adjust the frequency of the variable frequency fan 1 so that the inlet static pressure value of the test air duct 4 reaches the designed pressure value.

[0056] (3) The wind speed at the air outlet of the air valve 422 is measured by using multiple wind speed sensors 53 on the test air duct 52. Through data processing and analysis, the measured air volume of each air valve 422 on both sides of the main air duct 41 and the deviation from the air outlet air volume design value are displayed on the display screen 54. The air valve 422 is adjusted so that the deviation between the air volume of each air valve 422 and the air outlet air volume design value is controlled within the range of 12% to 15%. By replacing different types of air valves and performing repeated tests, the air valve 422 with the best air volume uniformity is selected.

[0057] Step 5: Test the air volume uniformity of different connection forms between the air duct section and the main air duct

[0058] After determining the type of air valve 422, stop the variable frequency fan 1. Change the connection form between the air duct sparse joint 421 and the main air duct 41. The connection modes between the main air duct 41 and the air duct sparse joint 421 include Y-shaped arc tee, flow guide + T-shaped tee, or T-shaped 45° tee. Start the variable frequency fan 1, and measure the air volume of each air valve 422 on both sides of the main air duct 41 and the deviation from the design value of the air volume of the air outlet through the air volume test component 5, so that the deviation between the air volume of each air valve 422 and the design value of the air volume of the air outlet is controlled within the range of 8% to 10%, and then determine the best connection form between the air duct sparse joint 421 and the main air duct 41.

[0059] Step 6: Air volume uniformity test at different positions and angles of the reducer

[0060] If the air volume of each air valve 422 cannot be controlled within the range of 8% to 10% of the design value of the air volume of the air outlet through steps 4 and 5, the positions and angles of the multiple reducers 412 are changed, the variable frequency fan 1 is started, and the air volume of each air valve 422 on both sides of the main air duct 41 and the deviation from the design value of the air volume of the air outlet are measured by the air volume test component 5, and the positions and angles of the multiple reducers 412 are determined so that the deviation of the air volume of each air valve 422 from the design value of the air volume of the air outlet is controlled within the range of 8% to 10%.

[0061] Step 7: Air volume uniformity test of different types of air outlets

[0062] After determining the positions and angles of multiple reducers 412, on this basis, different forms of air outlets 424 are installed on the air valve 422 through the connecting pipe 423. Start the variable frequency fan 1, and measure the air volume of each air outlet 424 on both sides of the main air duct 41 and the deviation from the design value of the air outlet air volume through the air volume test component 5, so that the deviation of the air volume of each air outlet 424 from the design value of the air outlet air volume is controlled within the range of 3% to 5%. Compare the deviation values ​​of the air volume of different forms of air outlets 424 and the design value of the air outlet air volume, and obtain the air outlet 424 with the best air volume uniformity performance. So far, through step-by-step screening, a combination scheme of air duct system with high-precision and uniform air volume is selected.

[0063] The present invention can test the air leakage of air ducts of different materials, and test the uniformity of air supply volume of air ducts of different types of air valves, different connection forms of air duct sparse joints and main air ducts, reducers at different positions and angles, and different types of air outlets, so as to screen out a combination scheme of air duct systems with high-precision and uniform air volume. This provides a scientific basis for the selection of air duct materials and components in engineering construction, especially in large scientific device construction projects, helps to optimize the design of air duct systems, ensure the uniformity and stability of air supply, and meet the process requirements under specific environments. At the same time, by integrating a data acquisition module and a data processing module, the present invention can automatically receive data from each wind speed sensor and the input air outlet air volume design value, and organize and store them. The data processing module further processes and analyzes these data, calculates the air outlet volume of the air valve or air outlet on the branch air duct assembly, and the deviation of the air outlet volume of the air valve or air outlet from the air outlet air volume design value, and displays these results on a display screen, which simplifies the test process, reduces the complexity of manual operation, and improves the test efficiency, making the test process more convenient and efficient.

[0064] It should be noted that the above-mentioned electrical components are all existing technology products. Technical personnel in this field select, install and complete the circuit debugging work according to the needs of use to ensure that all electrical appliances can work normally. The components are all universal standard parts or components known to technical personnel in this field. Their structures and principles can be known to technical personnel through technical manuals or through conventional test methods. The applicant does not make specific restrictions here.

[0065] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A duct system test platform with high-precision and uniform air volume, comprising a variable frequency fan (1), characterized in that: The port of the variable frequency fan (1) is fixedly connected to a flexible connector (2); one end of the flexible connector (2) away from the variable frequency fan (1) is fixedly connected to a flow-stabilizing air duct (3); one end of the flow-stabilizing air duct (3) away from the flexible connector (2) is provided with a test air duct (4); the test air duct (4) comprises a main air duct (41), a branch air duct assembly (42), and a smoke generator (43); wherein the main air duct (41) is composed of a plurality of groups of air supply sections (411) and a plurality of reducers (412); and the air volume test assembly (5) is detachably connected to the test air duct (4).

2. The air duct system test platform with high-precision and uniform air volume according to claim 1 is characterized by: One end of the steady flow air duct (3) connected to the test air duct (4) is provided with a pressure gauge (31) for measuring the inlet static pressure of the test air duct (4), and the other end of the test air duct (4) is closed.

3. The air duct system test platform with high-precision and uniform air volume according to claim 1 is characterized by: The main air duct (41) is connected to the steady-flow air duct (3); a smoke generator (43) is provided at the front and rear ends of the main air duct (41); and a particle catcher is provided outside the main air duct (41) for detecting the sealing effect of the main air duct (41).

4. The air duct system test platform with high-precision and uniform air volume according to claim 1 is characterized by: The branch air duct assembly (42) comprises an air duct joint (421), an air valve (422), a connecting pipe (423), and an air outlet (424); the air duct joint (421) is detachably connected to the outer wall of the main air duct (41); the air duct joint (421) is connected to the main air duct (41); the air valve (422) is arranged on the air duct joint (421); one end of the air valve (422) away from the main air duct (41) is connected to the connecting pipe (423); and the air outlet (424) is connected to the connecting pipe (423).

5. The air duct system test platform with high-precision and uniform air volume according to claim 1 is characterized by: The air volume test assembly (5) comprises a mobile platform (51), a test air duct (52) is fixedly connected to the upper side of the mobile platform (51), a plurality of wind speed sensors (53) are arranged at one end of the test air duct (52), and a display screen (54) is arranged on the outer wall of the test air duct (52).

6. The air duct system test platform with high-precision and uniform air volume according to claim 4 is characterized by: The main air duct (41) and the air duct junction (421) are connected by a Y-shaped arc tee, a flow guide + T-shaped tee, or a T-shaped 45° tee.

7. The air duct system test platform with high-precision and uniform air volume according to claim 5 is characterized by: The display screen (54) includes a data input module for inputting a design value of the air outlet volume. The data input module and the wind speed sensor (53) are connected to a data acquisition module by telecommunication, and the data acquisition module is connected to a data processing module by telecommunication. The data acquisition module organizes and stores the received data for subsequent data processing and analysis. The data processing module processes and analyzes the data transmitted by the data acquisition module, calculates the air outlet volume of the air valve (422) or the air outlet (424) on the branch air duct assembly (42), and the deviation between the air outlet volume of the air valve or the air outlet and the design value of the air outlet volume, and displays these results on the display screen (54).

8. An operating method of a duct system test platform with high-precision and uniform air volume according to claim 1, comprising the following steps: Step 1: Based on the air outlet air volume design value and other relevant parameters, a computational fluid dynamics (CFD) numerical simulation method is used to preliminarily determine the length and cross-sectional dimensions of multiple groups of air supply sections (411) in the main air duct (41), the positions and angles of multiple reducers (412), and the connection form between the air duct section (421) and the main air duct (41). Step 2: Make three sections of duct with different materials respectively, and use the air leakage tester to test the air leakage of the duct section. The test method refers to the current GB50243 "Quality Acceptance Code for Ventilation and Air Conditioning Engineering Construction" or JGJ141 "Technical Regulations for Ventilation Ducts" and other relevant specifications. By comparing the air leakage of duct sections with different materials, evaluate the sealing performance between duct sections with different materials, and obtain the duct material with the smallest air leakage and its connection and sealing process. Step 3: Based on step 1 and step 2, according to the length and cross-sectional dimensions of the air supply section (411), the position and angle of the reducer (412), and the connection form between the air duct joint (421) and the main air duct (41), the air duct material with the least air leakage is selected to make a steady flow air duct (3), a main air duct (41), an air duct joint (421), a connecting pipe (423), and an air volume test assembly (5), and a suitable variable frequency fan (1) and soft connector (2) are selected to build a high-precision and uniform air volume air duct system test platform. Each air duct joint (421) is sealed with a blind plate, the smoke generator (43) is started, and the sealing condition of the main air duct (41) is detected by the provided particle catcher. Step 4: Install the air valve (422) on the air duct joint (421), dock and fix the end of the test air duct (52) away from the wind speed sensor (53) with the air valve (422) through the mobile platform (51), and input the design value of the air outlet air volume on the display screen (54). Start the variable frequency fan (1), and adjust the frequency of the variable frequency fan (1) by observing the pressure gauge (31) on the flow stabilizing tube (3) so that the inlet static pressure value of the test air duct (4) reaches the designed static pressure value. Use multiple wind speed sensors (53) on the test air duct (52) to measure the air velocity at the air outlet of the air valve (422), and display the measured air volume of each air valve on both sides of the main air duct and the deviation from the design value of the air outlet air volume on the display screen (54) through data processing and analysis. Adjust the air valve (422) so that the deviation of the air volume of each air valve (422) from the design value of the air outlet air volume is controlled within the range of 12% to 15%. By replacing different types of air valves (422) and performing repeated tests, an air valve (422) with the best air volume uniformity is selected. Step 5: After the type of air valve (422) is determined, the connection form between the air duct joint (421) and the main air duct (41) is changed on this basis. The variable frequency fan (1) is started, and the air volume test component (5) is used to measure the air volume of each air valve (422) on both sides of the main air duct (41) and the deviation from the air volume design value of the air outlet, so that the deviation between the air volume of each air valve (422) and the air volume design value of the air outlet is controlled within the range of 8% to 10%, and then the best connection form between the air duct joint (421) and the main air duct (41) is determined. Step 6: If the deviation between the air volume of each air valve (422) and the air volume design value of the air outlet cannot be controlled within the range of 8% to 10% through steps 4 and 5, the positions and angles of the multiple reducers (412) are changed. The variable frequency fan (1) is started, and the air volume of each air valve (422) on both sides of the main air duct and the deviation from the air volume design value of the air outlet are measured by the air volume test component (5), so that the deviation between the air volume of each air valve (422) and the air volume design value of the air outlet can be controlled within the range of 8% to 10%, and then the positions and angles of the multiple reducers (412) with the best air volume uniformity are determined. Step 7: After determining the position and angle of the reducer (412), on this basis, install different forms of air outlets (424) on the air valve (422) through the connecting pipe (423). Start the variable frequency fan (1), and measure the air volume of each air outlet (424) on both sides of the main air duct and the deviation from the design value of the air outlet air volume through the air volume test component (5), so that the deviation of the air volume of each air outlet (424) from the design value of the air outlet air volume can be controlled within the range of 3% to 5%. Compare the deviation values ​​of the air volume of different forms of air outlets (424) and the design air volume, and determine the air outlet (424) with the best air volume uniformity. At this point, through step-by-step screening, a combination scheme of air duct system with high-precision and uniform air volume is selected.

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