Umbrella type portable wind speed and wind pressure detection device for wind guide device and use method

Abstract

The invention discloses an umbrella type portable wind speed and wind pressure detection device for a wind guide device and a use method, the device comprises six umbrella ribs connected through an umbrella cap, and the umbrella cap and the umbrella ribs are connected and supported through a middle rod; a plurality of groups of wind speed detection modules and a plurality of groups of wind pressure detection modules are fixedly mounted in the umbrella ribs, and are respectively connected with the monitoring signal storage and transmission module through cables; and the monitoring signal storage, processing and transmission module is in communication connection with a terminal outside the tested ventilating duct. According to the scheme, measurement errors caused by manual testing and instrument equipment are reduced, and the data accuracy is effectively guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel engineering ventilation, and in particular, to an umbrella-type portable air guiding device wind speed and wind pressure detection device and a using method thereof. Background Art

[0002] The tunnel construction ventilation system plays a crucial role in the tunnel construction process. It can quickly discharge the dust generated during the face blasting and the harmful gases released during the operation of construction machinery, continuously supply fresh air to the operation area, not only effectively guarantees the personal safety of construction workers, greatly improves the construction efficiency, but also effectively adjusts the temperature and humidity environment in the tunnel, creating more suitable conditions for construction. However, the installation of tunnel ventilation equipment in a complex environment may be imperfect due to space limitations, harsh environment, etc. In some special operation scenarios, such as areas with blasting operations, the ventilation equipment may be impacted by the sputtering of blasting slag, causing pipeline damage. When the air duct needs to move in a narrow space or complex pipeline, it may be bent, squeezed or even damaged, thus affecting the ventilation efficiency. Therefore, being able to accurately and conveniently detect the two key indicators of wind speed and wind pressure of the ventilation device, and then obtain the average air leakage rate per 100 meters and the average air resistance per 100 meters of the air duct, is the key to evaluating the quality of ventilation systems in various complex environments and ensuring the normal operation of the ventilation system and the efficient operation of related equipment.

[0003] In the actual on-site environment such as tunnel construction, there are many drawbacks in the existing detection methods for the key performance parameters of air ducts. Usually, the method of mechanical lifting combined with manual holding of a wind speed and wind pressure tester is used to measure the wind speed and wind pressure of a single measurement point at the air outlet of the air duct at the face. Then, the single measurement point data is regarded as the average wind speed and wind pressure of the air duct, and the average air leakage rate per 100 meters and the average air resistance per 100 meters are calculated based on this. This method not only cannot monitor the key performance parameters of the air duct in real time, but also because only relying on single measurement point data, there is a large difference from the actual overall situation, resulting in a large deviation in the calculated average air leakage rate per 100 meters and average air resistance per 100 meters data, making it difficult to accurately reflect the true performance of the air duct, thus bringing many uncertainties to the design, construction and subsequent maintenance work of the ventilation system. Summary of the Invention

[0004] In view of the above technical problems, the present invention provides an umbrella-type portable air guiding device wind speed and wind pressure detection device and a using method thereof.

[0005] The present invention is implemented by the following technical solutions: An umbrella-type portable air duct device wind speed and wind pressure detection device, including six umbrella ribs connected by an umbrella cap, and the umbrella cap and the umbrella ribs are connected and supported by a middle rod; multiple groups of wind speed detection modules and multiple groups of wind pressure detection modules are fixedly installed in the umbrella ribs, and multiple groups of wind speed detection modules and multiple groups of wind pressure detection modules are respectively connected to the monitoring signal storage and transmission module through cable wires, and the monitoring signal storage, processing and transmission module is communicatively connected to a terminal outside the measured ventilation duct.

[0006] Specifically, the connection methods between the monitoring signal storage, processing and transmission module and the terminal include wired connection and wireless connection. The wired connection method includes cable wire connection, and the wireless connection methods include short-range wireless transmission such as Bluetooth transmission or WiFi transmission and long-range wireless transmission of 4G or 5G networks.

[0007] Specifically, the six umbrella ribs are all hollow cylindrical structural members, composed of multiple telescopic rods with adjustable lengths, and the multiple telescopic rods are connected by a locking device.

[0008] Specifically, the locking device includes a nested metal tube, a button and a card slot.

[0009] Specifically, the umbrella cap and the six umbrella ribs are connected to form an umbrella surface, and a buckle or adhesive for fixing to the air duct is provided at one end of the umbrella rib, and is tightly connected to the air duct.

[0010] Specifically, the wind speed detection module is internally provided with a high-precision hot-wire anemometer sensor to measure the wind speed at the air outlet of the ventilation device; it is also equipped with a signal processing circuit to convert the analog signal collected by the sensor into a digital signal and transmit it to the monitoring signal storage, processing and transmission module.

[0011] Specifically, the wind pressure detection module is provided with a piezoresistive pressure sensor to measure the wind pressure through the pressure difference inside and outside the ventilation device; it is also provided with a signal processing circuit to convert the pressure signal into a digital signal and transmit it to the monitoring signal storage, processing and transmission module.

[0012] Specifically, the monitoring signal storage, processing and transmission module includes a central processing unit and a power module. The central processing unit uses a high-performance microcontroller to receive the digital signals transmitted from the wind speed detection module and the wind pressure detection module, and uses a preset algorithm to process and analyze the data, calculate the specific values of the wind speed and wind pressure. The central processing unit also has a data storage function to store the detection data in the internal memory for data transmission and analysis; the power module supplies power to the entire detection device, including a rechargeable lithium battery and a charging interface.

[0013] A method for using an umbrella-type portable air duct device wind speed and wind pressure detection device includes the following steps: Step S1: Extend the umbrella ribs of the umbrella-type portable air velocity and air pressure detection device for ventilation devices to the longest length. Step S2: Open the umbrella surface through the umbrella handle, and the outer side of the umbrella surface is perpendicular to the incoming wind direction until it fits the inner wall of the ventilation device to be measured, and ensure that the umbrella handle is on the axis of the ventilation duct. Step S3: Fix the two ends of the six umbrella ribs to the inner cross-section of the ventilation device to be measured with buckles or adhesives, and ensure that the umbrella handle is on the axis of the ventilation duct.

[0014] Step S4: Start the power supply, and calculate and view the air velocity and air pressure of the cross-section of the ventilation device to be measured through the terminal computer.

[0015] Step S5: If long-term monitoring is required, keep the device running; if it is a temporary monitoring and the device needs to be recovered, then go to Step S6, recover the umbrella-type portable air velocity and air pressure detection device for ventilation devices, and reinstall it when used next time. Step S6: Turn off the power supply, loosen the buckles or adhesives between the two ends of the six umbrella ribs and the ventilation device to be measured, reduce the umbrella surface through the umbrella handle until the six umbrella ribs are parallel, and remove the device. Step S7: Shorten the length of the six umbrella ribs to the shortest length, and the detection is completed.

[0016] Specifically, Step S4 further includes the calculation of the average air volume and the average air pressure, as well as the calculation of the air leakage rate per 100 meters of the air duct. The calculation formulas for the average air volume and the average air pressure are: ; Where, is the average air volume of the monitoring section, with the unit of m 3 / s; is the average air pressure of the monitoring section, with the unit of Pa; is the air velocity measured by each sensor in the monitoring section, m / s; is the air pressure measured by each sensor in the monitoring section, with the unit of Pa; n is the number of monitoring sensors; A is the cross-sectional area of the air duct, with the unit of m 2 , where ; The calculation formula for the air leakage rate per 100 meters of the air duct is: ; Where, is the air leakage rate per 100 meters of the air duct between any two adjacent monitoring sections, in percentage; is the average air volume of the previous monitoring section, with the unit of m 3 / s; is the average air volume of the next monitoring section, with the unit of m 3 / s; is the length of the air duct between the two monitoring sections, with the unit of m.

[0017] The beneficial effects of the present invention are as follows: The present invention integrates multiple groups of wind speed and wind pressure sensors, which are retractable and easy to carry. It can quickly and intelligently measure the wind speed and wind pressure of ventilation devices with different diameters, effectively monitor the ventilation quality, and ensure the ventilation requirements of construction personnel and equipment. Compared with the traditional manual hand-held instrument equipment test, it greatly saves manpower and material resources. The test system is more advanced, with automation and intelligent characteristics. At the same time, it also greatly reduces the measurement errors brought by manual testing and instrument equipment, effectively guaranteeing the accuracy of data. The test system of the present invention can monitor in real time and timely grasp the severity of air leakage and the degree of duct bending of each section of the air duct along the tunnel, effectively monitor the air leakage and damage of the air duct and the phenomena of "intestinal obstruction" and "blockage", and take corresponding measures for remedy in time, fully guaranteeing the safety of construction personnel and meeting the normal air supply requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0019] Figure 1 It is a bottom view of the structure of the wind speed and wind pressure detection device of the umbrella-type portable air guiding device in the expanded state in the embodiment of the present invention; Figure 2 It is a front view of the structure of the wind speed and wind pressure detection device of the umbrella-type portable air guiding device in the expanded state in the embodiment of the present invention; Figure 3 It is a front view of the structure of the wind speed and wind pressure detection device of the umbrella-type portable air guiding device in the contracted state in the embodiment of the present invention; Among them, 1 - umbrella rib, 2 - wind speed detection module, 3 - wind pressure detection module, 4 - monitoring signal storage, processing and transmission module, 5 - cable, 6 - middle rod, 7 - umbrella cap, 8 - umbrella rod. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0021] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0022] The following is combined with Figures 1 - 3 , some embodiments of the present invention are described in detail. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0023] The present invention proposes a wind speed and wind pressure detection device for an umbrella-type portable wind guide device, comprising six umbrella ribs connected by an umbrella cap, wherein the umbrella cap and the umbrella ribs are connected and supported by a middle rod; multiple groups of wind speed detection modules and multiple groups of wind pressure detection modules are fixedly installed in the umbrella ribs, and the multiple groups of wind speed detection modules and multiple groups of wind pressure detection modules are respectively connected to monitoring signal storage and transmission modules through cables, and the monitoring signal storage, processing and transmission module is communicatively connected with a terminal outside the measured ventilation duct. The connection mode between the monitoring signal storage, processing and transmission module and the terminal includes wired connection and wireless connection, wherein the wired connection mode includes cable connection, and the wireless connection mode includes short-range wireless transmission of Bluetooth transmission or WiFi transmission and long-range wireless transmission of 4G or 5G network.

[0024] The six ribs are all hollow cylindrical structural parts, composed of multiple sections of telescopic rods with adjustable lengths, and the multiple sections of telescopic rods are connected by a locking device. The locking device includes a nested metal tube, a button and a slot. The umbrella cap is connected to the six ribs to form an umbrella surface, and a buckle or adhesive is provided at one end of the rib to fix it to the air duct, and it is tightly connected to the air duct.

[0025] The wind speed detection module has a built-in high-precision hot wire wind speed sensor to measure the wind speed at the air outlet of the ventilation device; it is also equipped with a signal processing circuit to convert the analog signal collected by the sensor into a digital signal and transmit it to the monitoring signal storage, processing and transmission module. The wind pressure detection module is equipped with a piezoresistive pressure sensor to measure the wind pressure through the pressure difference between the inside and outside of the ventilation device; it is also equipped with a signal processing circuit to convert the pressure signal into a digital signal and transmit it to the monitoring signal storage, processing and transmission module. The monitoring signal storage, processing and transmission module includes a central processing unit and a power module. The central processing unit adopts a high-performance microcontroller to receive the digital signals from the wind speed detection module and the wind pressure detection module, and uses a preset algorithm to process and analyze the data to calculate the specific values of wind speed and wind pressure. The central processing unit also has a data storage function to store the detection data in the internal memory for data transmission and analysis; the power module supplies power to the entire detection device, including a rechargeable lithium battery and a charging interface. In a specific embodiment, Figure 1 , 2As shown in the figure, the present invention discloses an umbrella - type portable air - flow velocity and pressure detection device for a ventilation device, which includes umbrella ribs 1. Six umbrella ribs 1 are connected by an umbrella cap 7. A middle rod 6 connects the umbrella pole 8 and the umbrella ribs 1 to play a supporting role. Multiple groups of air - flow velocity detection modules 2 and multiple groups of air - pressure detection modules 3 are fixedly installed in the umbrella ribs. In the umbrella ribs, multiple groups of air - flow velocity detection modules 2 and multiple groups of air - pressure detection modules 3 are connected to a monitoring signal storage and transmission module 4 through cable wires. The monitoring signal storage, processing and transmission module 4 is communicatively connected to a terminal outside the measured ventilation duct through a cable wire 5 or a wireless network.

[0026] In this embodiment, the terminal is a computer, which can be a laptop, a desktop computer, a tablet computer, a smart phone, etc. When the signal transmission method is selected as the wireless transmission method, it can either adopt a short - range wireless transmission method such as Bluetooth transmission or WiFi transmission, or adopt a long - range wireless transmission method such as 4G or 5G network. Furthermore, it can realize remote cross - regional measurement on a cloud platform and can view the average air - flow velocity and air - pressure of the ventilation duct in real time on the computer.

[0027] In this embodiment, the umbrella rib 1 is the main structure of the whole device, which is a hollow cylindrical structural member and is composed of multiple telescopic rods. These telescopic rods can adjust their lengths through a certain mechanical structure (such as nested metal tubes, using friction or simple locking devices such as buttons and card slots) to meet the requirements of different usage scenarios and ventilation ducts with different diameters.

[0028] Six umbrella ribs 1 are connected together by an umbrella cap 7 to form an umbrella surface. At one end of the umbrella rib, there can be a buckle or adhesive for fixing to the ventilation duct to ensure a tight connection with the ventilation duct, without affecting the air - supply function of the ventilation duct, and can measure the air - flow velocity and air - pressure of this section in real time. When in use, adjust the lengths of the six umbrella ribs 1 to the maximum, and open the umbrella surface through the umbrella handle 8 until it fits the inner wall of the measured ventilation device and ensure that the umbrella handle is on the axis of the ventilation duct. When not in use, as Figure 3 shown, shrink the umbrella surface through the umbrella handle 8 until the six umbrella ribs 1 are parallel, and shorten the length of the umbrella ribs 1, which is convenient for carrying.

[0029] In this embodiment, the air - flow velocity detection module is internally equipped with a high - precision hot - wire anemometer sensor. This sensor adopts advanced micro - electro - mechanical system (MEMS) technology, can quickly respond to changes in air - flow velocity, and accurately measure the air - flow velocity at the air outlet of the ventilation device. The air - flow velocity detection module is also equipped with a signal processing circuit, which can convert the analog signal collected by the sensor into a digital signal and transmit it to the monitoring signal storage, processing and transmission module 4.

[0030] The wind pressure detection module 3 uses a piezoresistive pressure sensor to measure the wind pressure by sensing the pressure difference inside and outside the ventilation device. The pressure sensor features high precision and high sensitivity, capable of accurately measuring minute pressure changes. The wind pressure detection module is also equipped with a signal processing circuit for converting the pressure signal into a digital signal and transmitting it to the monitoring signal storage, processing, and transmission module 4.

[0031] Multiple groups of wind speed detection modules 2 and multiple groups of wind pressure detection modules 3 are installed on the umbrella ribs 1. The installation quantity is 6 pieces of wind speed detection modules 2 and 6 pieces of wind pressure detection modules 3 for each umbrella rib, and a total of 18 pieces of wind speed detection modules 2 and 18 pieces of wind pressure detection modules 3 are installed in the system.

[0032] The monitoring signal storage, processing, and transmission module 4 connects multiple groups of wind speed detection modules 2 and multiple groups of wind pressure detection modules 3 through cable lines inside the hollow umbrella rib. The monitoring signal storage, processing, and transmission module 4 communicates and connects with a computer outside the measured ventilation duct through cable line 5 or a wireless network. The monitoring signal storage, processing, and transmission module 4 is equipped with a central processing unit and a power module. The central processing unit uses a high-performance microcontroller to receive the digital signals transmitted by the wind speed detection module and the wind pressure detection module, processes and analyzes the data using a preset algorithm, calculates the specific values of the wind speed and wind pressure, and the central processing unit also has a data storage function, capable of storing the detection data in the internal memory for convenient data transmission and analysis; the power module uses a rechargeable lithium battery to supply power to the entire detection device, is provided with a charging interface, and can be charged through a common USB interface to ensure that the detection device can work continuously and stably in different environments.

[0033] In this embodiment, the cable line 5 can transmit signals and the USB interface line for charging the power supply module.

[0034] Embodiment 2 As Figure 2 shown, the present invention discloses a method for using a wind speed and wind pressure detection device of an umbrella-type portable air guiding device, including the following steps: Step 1: Extend the umbrella ribs 1 of a wind speed and wind pressure detection device of an umbrella-type portable ventilation device to the longest length; Step 2: Open the umbrella surface through the umbrella handle 8, and the outer side of the umbrella surface is perpendicular to the incoming wind direction until it fits the inner wall of the measured ventilation device and ensure that the umbrella handle is on the axis of the ventilation duct, as Figure 1 、 2 ; Step 3: Fix both ends of 6 umbrella ribs to the inner cross-section of the measured ventilation device with buckles or adhesives, and ensure that the umbrella handle is on the axis of the ventilation duct.

[0035] Step 4: Turn on the power, and the wind speed and wind pressure of the cross-section of the measured ventilation device can be viewed through a computer.

[0036] Step 5: If long-term monitoring is required, such as measuring the air velocity and air pressure of the fan at the inlet of the axial flow fan at the tunnel entrance, the process can end at Step 4. If it is temporary monitoring and a recovery device is needed, continue to Step 6. For example, when measuring the air velocity and air pressure in the ventilation duct at the tunnel face, as the tunnel face advances, the installation of the duct also needs to advance with the progress of the tunnel face. In this case, the wind speed and air pressure detection device of the umbrella-type portable ventilation device need to be recovered and reinstalled. Step 6: Turn off the power supply, loosen the buckles or adhesives at both ends of the six umbrella ribs and the ventilation device being measured, and shrink the umbrella surface through the umbrella handle 8 until the six umbrella ribs 1 are parallel, then remove the device. Step 7: Shorten the length of the six umbrella ribs 1 to the shortest length, such as Figure 3 , and end.

[0037] When calculating the air leakage rate in a section of the ventilation device, such as the air inlet at the tunnel entrance and the air outlet at the tunnel face, the calculation method is as follows: Calculate the average air volume and average air pressure of each monitoring section. The formulas are as follows: ; Among them, is the average air volume of the monitoring section, with the unit of m 3 / s; is the average air pressure of the monitoring section, with the unit of Pa; is the air velocity measured by each sensor in the monitoring section, in m / s; is the air pressure measured by each sensor in the monitoring section, with the unit of Pa; n is the number of monitoring sensors; A is the cross-sectional area of the air duct, with the unit of m 2 , where ; Calculate the air leakage rate per 100 meters of the air duct in the monitoring section. The formula is as follows: ; Among them, is the air leakage rate per 100 meters of the air duct between any two adjacent monitoring sections, in percentage; is the average air volume of the previous monitoring section, with the unit of m 3 / s; is the average air volume of the next monitoring section, with the unit of m 3 / s; is the length of the air duct between the two monitoring sections, with the unit of m.

[0038] For the foregoing embodiments, for the sake of simple description, they are all expressed as a series of action combinations. However, those skilled in the art should know that this application is not limited by the described action sequence, because according to this application, some steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are preferred embodiments, and the actions involved are not necessarily essential to this application.

[0039] In the above embodiments, the basic principles, main features and advantages of the present invention are described. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only explains the principle of the present invention. Without departing from the spirit and scope of the present invention, any changes and modifications made by those skilled in the art shall fall within the protection scope of the appended claims of the present invention.

Claims

1. An umbrella-type portable air guide device wind speed and wind pressure detection device, characterized in that, It includes six umbrella ribs connected by an umbrella cap, and the umbrella cap and the umbrella ribs are connected and supported by a middle rod; multiple groups of wind speed detection modules and multiple groups of wind pressure detection modules are fixedly installed in the umbrella ribs, and multiple groups of wind speed detection modules and multiple groups of wind pressure detection modules are respectively connected to a monitoring signal storage and transmission module through cable wires, and the monitoring signal storage, processing and transmission module is communicatively connected to a terminal outside the measured ventilation duct.

2. The wind speed and wind pressure detection device of an umbrella-type portable air guiding device according to claim 1, characterized in that, The connection mode between the monitoring signal storage, processing and transmission module and the terminal includes wired connection and wireless connection. The wired connection mode includes cable wire connection, and the wireless connection mode includes short-range wireless transmission such as Bluetooth transmission or WiFi transmission and remote wireless transmission of 4G or 5G network.

3. The wind speed and wind pressure detection device of an umbrella-type portable air guiding device according to claim 1, characterized in that, The six umbrella ribs are all hollow cylindrical structural members, which are composed of multiple telescopic rods with adjustable lengths, and the multiple telescopic rods are connected by a locking device.

4. The wind speed and wind pressure detection device of an umbrella-type portable air guiding device according to claim 3, characterized in that, The locking device includes a nested metal tube, a button and a card slot.

5. The wind speed and wind pressure detection device of an umbrella-type portable air guiding device as described in claim 1, characterized in that, The umbrella cap is connected to the six umbrella ribs to form an umbrella surface, and a buckle or adhesive for fixing to the air duct is arranged at one end of the umbrella rib, and is tightly connected to the air duct.

6. The wind speed and wind pressure detection device of an umbrella-type portable air guiding device according to claim 1, characterized in that, The wind speed detection module is internally provided with a high-precision hot-wire anemometer sensor to measure the wind speed at the air outlet of the ventilation device; it is also equipped with a signal processing circuit to convert the analog signal collected by the sensor into a digital signal and transmit it to the monitoring signal storage, processing and transmission module.

7. The wind speed and wind pressure detection device of an umbrella-type portable air guiding device according to claim 1, characterized in that The wind pressure detection module is provided with a piezoresistive pressure sensor to measure the wind pressure through the pressure difference inside and outside the ventilation device; it is also provided with a signal processing circuit to convert the pressure signal into a digital signal and transmit it to the monitoring signal storage, processing and transmission module.

8. The wind speed and wind pressure detection device of an umbrella-type portable air guiding device according to claim 1, characterized in that, The monitoring signal storage, processing and transmission module includes a central processing unit and a power module. The central processing unit uses a high-performance microcontroller to receive the digital signals transmitted by the wind speed detection module and the wind pressure detection module, and uses a preset algorithm to process and analyze the data, calculate the specific values of the wind speed and wind pressure. The central processing unit also has a data storage function to store the detection data in the internal memory for data transmission and analysis; the power module supplies power to the entire detection device, including a rechargeable lithium battery and a charging interface.

9. The usage method of a wind speed and wind pressure detection device for an umbrella-type portable air guiding device according to any one of claims 1 to 8, characterized in that, It includes the following steps: Step S1: Extend the umbrella ribs of the umbrella-type portable air guiding device wind speed and wind pressure detection device to the longest length; Step S2: Open the umbrella surface through the umbrella handle, and the outside of the umbrella surface is perpendicular to the incoming wind direction until it fits the inner wall of the measured ventilation device and ensure that the umbrella handle is on the axis of the ventilation duct; Step S3: Fix the two ends of the six umbrella ribs to the inner cross-section of the measured ventilation device with a buckle or adhesive, and ensure that the umbrella handle is on the axis of the ventilation duct; Step S4: Start the power supply, and calculate and view the wind speed and wind pressure of the cross-section of the measured ventilation device through the terminal computer; Step S5: If long-term monitoring is required, keep the device running; if it is temporary monitoring and the device needs to be recovered, then go to Step S6 to recover the umbrella-type portable air guiding device wind speed and wind pressure detection device, and reinstall it when using it next time; Step S6: Turn off the power supply, loosen the buckle or adhesive between the two ends of the six umbrella ribs and the measured ventilation device, shrink the umbrella surface through the umbrella handle until the six umbrella ribs are parallel, and remove the device; Step S7: Shorten the lengths of the six umbrella ribs to the shortest length, and the detection ends.

10. The usage method of an air velocity and air pressure detection device for an umbrella-type portable air guiding device as described in claim 9, characterized in that, The said step S4 also includes the calculation of the average air volume and average air pressure, as well as the calculation of the air leakage rate per 100 meters of the air duct. The calculation formulas for the average air volume and average air pressure are: ； Among them, is the average air volume of the monitoring section, with the unit of m 3 / s; is the average air pressure of the monitoring section, with the unit of Pa; is the wind speed measured by each sensor at the monitoring section, in m / s; is the air pressure measured by each sensor at the monitoring section, with the unit of Pa; n is the number of monitoring sensors; A is the cross-sectional area of the air duct, with the unit of m 2 , where ; The calculation formula for the air leakage rate per 100 meters of the air duct is: ； Among them, is the air leakage rate per 100 meters of the air duct between any two adjacent monitoring sections, in percentage; is the average air volume of the previous monitoring section, with the unit of m 3 / s; is the average air volume of the next monitoring section, with the unit of m 3 / s; is the length of the air duct between the two monitoring sections, with the unit of m.

Images