A splicable flow measuring device suitable for measuring large cross-section flow

Abstract

The present invention discloses a splicable flow measurement device suitable for large-section flow. The device comprises a computer, a data acquisition unit, a micromanometer, a tube bundle collection device, a flow measurement device main frame, and a total / static pressure measuring device. During measurement, a ladder-shaped frame and a sleeve are used to splice the flow measurement device main frame into a suitable structure based on the diameter or length and width of the measuring pipe. Markings are made on the flow measurement device main frame according to the selected flow measurement point determination method, and the total / static pressure measuring device is arranged at the characteristic point. The tube bundle collection device is used to connect the total / static pressure measuring device and the micromanometer. Data is collected in real time by the data acquisition unit and fed back to the computer to obtain the real-time flow rate of the measured fluid.

Description

Technical Field

[0001] The invention belongs to the field of measurement, and in particular relates to a splicable flow measuring device suitable for large-section flow. Background Art

[0002] In order to measure the flow rate of fluid in a certain cross section, a single pitot tube is often used for measurement. Currently, most existing pitot tubes are L-type or S-type pitot tubes, which can only complete the measurement of a single characteristic point each time. When there are many characteristic points during measurement, the measurement takes a long time; when the measured moving distance is inaccurate, it is easy to cause positioning errors and large deviations in the measurement results; when measuring the flow rate of a large cross section, the single pitot tube is prone to swinging greatly, resulting in inaccurate measurement results, and even the pitot tube may bend, deform or break.

[0003] During the commissioning process before a thermal power generator set is put into operation, it is often necessary to measure the flow rate of the boiler's secondary air bellows. However, the large cross-sectional area of ​​the secondary air bellows and the large secondary air flow rate are problems that plague the commissioning personnel. When the commissioning personnel use reinforced pitot tubes for flow measurement, they often encounter problems such as long measurement time, the pitot tube is too long and difficult to move, and the pitot tube is easy to swing during the measurement process, which limits the accuracy of the flow measurement results. Summary of the Invention

[0004] The present invention addresses the following issues: when there are many characteristic points, the measurement time of a single Pitot tube is long; when the cross-section of the measured tube is large and the flow rate is high, the Pitot tube is too long to move, and the Pitot tube is prone to swinging during the measurement process, which limits the accuracy of the flow measurement results. A splicable flow measurement device suitable for large cross-section flow is proposed. The system can solve the following problems: (1) when there are many characteristic points, the measurement time is long; (2) when the fluid flow rate is large, ordinary flow meters are prone to bending or breaking; (3) when the measurement requires a large number of people to cooperate, manual errors are large, and the measurement accuracy is low.

[0005] The present invention is achieved by adopting the following technical solutions:

[0006] A splicable flow measuring device suitable for measuring large cross-sectional flow, comprising a computer, a data acquisition device, a micromanometer, a tube bundle collection device, a flow measuring device main frame, a plurality of total pressure measuring devices and a static pressure measuring device;

[0007] Multiple total pressure measuring devices and static pressure measuring devices are respectively installed on the main frame of the flow measuring device. The output ends of the multiple total pressure measuring devices and static pressure measuring devices are connected to the input end of the micromanometer through a tube bundle collection device. The output end of the micromanometer is connected to the input end of the data collector. The output end of the data collector is connected to the input end of the computer.

[0008] A further improvement of the present invention is that the main frame of the flow measuring device is assembled in a splicing manner, and the component structures include a ladder-type frame, a spring extender and a sleeve.

[0009] A further improvement of the present invention is that both ends of the ladder-type frame are provided with spring extenders. When the two ladder-type frames are respectively inserted into the sleeves, the spring extenders will extend and be fixed in the holes of the sleeves, thereby achieving a splicing effect and increasing the length of the ladder-type frame.

[0010] A further improvement of the present invention is that a scale is provided on the ladder-shaped frame to facilitate the installation of a total pressure measuring device and a static pressure measuring device.

[0011] A further improvement of the present invention is that a plurality of total pressure measuring devices and static pressure measuring devices are installed according to different flow measurement point selection methods such as the Chebyshev method or the equal cross-section method, and there is no restriction on the flow measurement point selection method.

[0012] A further improvement of the present invention is that multiple total pressure measuring devices and static pressure measuring devices are composed of hooks, sampling micro-tubes, scale indicators, discs, rectangular holes, and straps. The sampling micro-tubes are fixed through the discs, the scale indicators are fixed on the same horizontal line as the centers of the discs and sampling micro-tubes, the straps are connected to the discs and multiple rectangular holes are opened on the straps. The multiple total pressure measuring devices and static pressure measuring devices are fixed on the ladder-shaped frame by tightening the rectangular holes on the straps with hooks fixed at both ends of the straps.

[0013] A further improvement of the present invention is that the material of the watch strap is composed of iron sheet and elastic rubber, the rubber covers the iron sheet, and the length of the strap is three quarters of the circumference of the cross section of the ladder-shaped frame.

[0014] A further improvement of the present invention is that the length of the iron sheet is two-thirds of the perimeter of the cross section of the ladder-shaped frame.

[0015] A further improvement of the present invention is that, when in operation, the main frame of the flow measuring device is placed in the fluid channel to be measured, and is fixed using the No. 1 pipe socket and the No. 2 pipe socket. The No. 1 pipe socket and the No. 2 pipe socket are welded to the fluid pipeline to be measured, and the sampling hole of the total pressure measuring device is placed facing the wind, and the sampling hole of the static pressure measuring device is placed leeward.

[0016] The present invention has at least the following beneficial technical effects:

[0017] The present invention provides a splicable flow measuring device suitable for large cross-section flow. First, two ladder-type frames that can reduce flow resistance are respectively inserted into the sleeve, and the spring extenders at both ends of the ladder-type frame are extended and fixed in the holes of the sleeve to achieve a splicing effect, increase the length of the ladder-type frame, and adjust it according to the diameter or length and width of the cross-section of the measured pipeline to determine the number of splicing of the ladder-type frame. Secondly, according to the user's measurement method, the measurement feature points are selected and marked at the same position of the main frame of the flow measuring device spliced ​​by the ladder-type frames; multiple total pressure measuring devices and static pressure measuring devices are respectively installed on the marked points on the main frame of the flow measuring device, and the total / static pressure measuring devices are fixed to the ladder-type frame by tightening the strap with a hook. Finally, a flexible tube with the same cross-section as the sampling micro-circular tube is used to connect the total / static pressure measuring device and the tube bundle assembly. The flow measurement device's main frame is placed in the measured fluid channel and secured using tube sockets 1 and 2. These sockets are welded to the measured fluid pipeline. The sampling hole for the total pressure measuring device is placed facing windward, while the sampling hole for the static pressure measuring device is placed leeward. After the tube bundle assembly is connected to the micromanometer, a data acquisition device continuously collects and transmits data to a computer, obtaining the real-time flow rate of the measured fluid.

[0018] The present invention can effectively solve the problems of long measurement time when there are many characteristic points; ordinary flow meters are prone to bending or breaking when the fluid flow rate is large; more people are required to cooperate during measurement, manual errors are large, and measurement accuracy is low. It is very suitable for measuring large-section and large-flow fluids in the power industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of a splicable flow measurement device suitable for large cross-sectional flow in the present invention;

[0020] Figure 2 This is a schematic diagram of the tube bundle collection device;

[0021] Figure 3 This is a schematic diagram of the main frame components of the flow measurement device;

[0022] Figure 4 This is a schematic diagram of a total / static pressure measuring device;

[0023] Figure 5 Schematic diagram of the tube socket.

[0024] Description of reference numerals:

[0025] 1-Computer; 2-Data acquisition unit 2; 3-Micromanometer; 4-Tube bundle collection device; 5-Main frame of flow measuring device; 5-1-Ladder-type frame; 5-2-Spring extender; 5-3-Sleeve; 6-1-Total pressure measuring device No. 1; 6-2-Total pressure measuring device No. 2; 6-3-Total pressure measuring device No. 3; 6-4-Total pressure measuring device No. 4; 6-5-Total pressure measuring device No. 5; 6-6-Total pressure measuring device No. 6; 6-7-Total pressure measuring device No. 7; 6-8-Total pressure measuring device No. 8; 6-9-Total pressure measuring device No. 9; 6-10-Total pressure measuring device No. 10; 7-Static pressure measuring device; 8-Tube socket No. 1; 9-Tube socket No. 2; 10-1-Hook; 10-2-Sampling micro-circular tube; 10-3-Scale indicator; 10-4-Disc; 10-5-Rectangular hole; 10-6-Watch strap. DETAILED DESCRIPTION

[0026] The present invention is further described below with reference to the accompanying drawings.

[0027] like Figure 1-3 As shown, the present invention proposes a splicable flow measuring device suitable for large-section flow, including a computer 1, a data acquisition unit 2, a micromanometer 3, a tube bundle collection device 4, a flow measuring device main frame 5, No. 1 total pressure measuring device 6-1, No. 2 total pressure measuring device 6-2, No. 3 total pressure measuring device 6-3, No. 4 total pressure measuring device 6-4, No. 5 total pressure measuring device 6-5, No. 6 total pressure measuring device 6-6, No. 7 total pressure measuring device 6-7, No. 8 total pressure measuring device 6-8, No. 9 total pressure measuring device 6-9, No. 10 total pressure measuring device 6-10, a static pressure measuring device 7, No. 1 pipe socket 8 and No. 2 pipe socket 9.

[0028] The main frame 5 of the flow measuring device is assembled in a splicing manner, and the components include a ladder-type frame 5-1, a spring extender 5-2 and a sleeve 5-3.

[0029] There are spring extenders 5-2 at both ends of the ladder-type frame 5-1. When the two ladder-type frames 5-1 are respectively inserted into the sleeves 5-3, the spring extenders 5-2 will extend and be fixed in the holes of the sleeves to achieve a splicing effect and increase the length of the ladder-type frame.

[0030] A scale is provided on the ladder-shaped frame 5 - 1 to facilitate the installation of the total pressure measuring device and the static pressure measuring device 7 .

[0031] Total pressure measuring device No. 1 6-1, total pressure measuring device No. 2 6-2, total pressure measuring device No. 3 6-3, total pressure measuring device No. 4 6-4, total pressure measuring device No. 5 6-5, total pressure measuring device No. 6 6-6, total pressure measuring device No. 7 6-7, total pressure measuring device No. 8 6-8, total pressure measuring device No. 9 6-9, total pressure measuring device No. 10 6-10, static pressure measuring device 7, etc. can be flexibly installed according to different flow measurement point taking methods, such as Chebyshev method, equal section method, etc.; the number of total pressure and static pressure measuring devices can be flexibly changed.

[0032] The total / static pressure measuring device is composed of a hook 10-1, a sampling micro-tube 10-2, a scale indicator 10-3, a disc 10-4, a rectangular hole 10-5, and a strap 10-6. The hook 10-1 is used to tighten the strap 10-6 to fix the total / static pressure measuring device on the ladder-shaped frame 5-1.

[0033] The material of the strap 10-6 is composed of iron sheet and elastic rubber, the rubber covers the iron sheet, the length of the iron sheet is two-thirds of the circumference of the cross section of the ladder-shaped frame 5-1, and the length of the belt is three-quarters of the circumference of the cross section of the ladder-shaped frame 5-1.

[0034] When in use, first insert two ladder-type frames 5-1 that can reduce flow resistance into the sleeve 5-3 respectively. The spring extenders 5-2 at both ends of the ladder-type frame 5-1 will extend and be fixed in the holes of the sleeve to achieve a splicing effect, increase the length of the ladder-type frame, and adjust it according to the diameter or length and width of the cross-section of the measured pipeline to determine the number of splicing of the ladder-type frames 5-1. Secondly, measurement feature points are selected according to the user's measurement method, and marked at the same position of the flow measuring device main frame 5 spliced ​​by the ladder-type frame 5-1; total pressure measuring instrument No. 1 6-1, total pressure measuring instrument No. 2 6-2, total pressure measuring instrument No. 3 6-3, total pressure measuring instrument No. 4 6-4, total pressure measuring instrument No. 5 6-5, total pressure measuring instrument No. 6 6, total pressure measuring instrument No. 7 6-7, total pressure measuring instrument No. 8 6-8, total pressure measuring instrument No. 9 6-9, total pressure measuring instrument No. 10 6-10, and static pressure measuring instrument 7 are respectively installed on the marked points on the flow measuring device main frame 5, and the total / static pressure measuring instrument is fixed to the ladder-type frame 5-1 by tightening the strap 10-6 with the hook 10-1. Finally, a flexible tube with the same cross-section as the sampling micro-circular tube 10-2 is used to connect the total / static pressure measuring device and the tube bundle assembly 4. The flow measurement device main frame 5 is placed in the measured fluid channel and secured using tube sockets 8 and 9. These two tube sockets are welded to the measured fluid pipeline. The sampling hole for the total pressure measuring device is placed facing the wind, while the sampling hole for the static pressure measuring device is placed leeward. After connecting the tube bundle assembly 4 to the micromanometer 3, the data acquisition device 2 continuously collects and transmits data to the computer 1, obtaining the real-time flow rate of the measured fluid.

[0035] Although the present invention has been described in detail above using general descriptions and specific embodiments, it will be apparent to those skilled in the art that modifications and improvements may be made based on the present invention. Therefore, such modifications and improvements, which do not depart from the spirit of the present invention, are intended to be within the scope of protection claimed herein.

Claims

1. A splicable flow measuring device suitable for measuring large cross-sectional flow, characterized in that: It includes a computer, a data acquisition device, a micro-manometer, a tube bundle collection device, a flow measurement device main frame, multiple total pressure measuring devices and a static pressure measuring device; A plurality of total pressure measuring devices and static pressure measuring devices are respectively installed on the main frame of the flow measuring device, and the output ends of the plurality of total pressure measuring devices and static pressure measuring devices are connected to the input end of the micromanometer through the tube bundle collection device, the output end of the micromanometer is connected to the input end of the data collector, and the output end of the data collector is connected to the input end of the computer; The main structure of the flow measuring device is assembled in a splicing manner, and the components are a ladder-type frame, a spring extender and a sleeve. There are spring extenders at both ends of the ladder-type frame. When the two ladder-type frames are inserted into the sleeves respectively, the spring extenders will extend and fix in the holes of the sleeves to achieve a splicing effect and increase the length of the ladder-type frame. The ladder-shaped frame is equipped with a scale to facilitate the installation of total pressure measuring devices and static pressure measuring devices; Multiple total pressure measuring devices and static pressure measuring devices are composed of hooks, sampling micro-tubes, scale indicators, discs, rectangular holes, and straps. The sampling micro-tubes are fixed on the discs, the scale indicators are fixed on the same horizontal line as the centers of the discs and sampling micro-tubes, the straps are connected to the discs and have multiple rectangular holes on them. The hooks fixed at both ends of the straps are used to tighten the rectangular holes on the straps to fix the multiple total pressure measuring devices and static pressure measuring devices on the ladder-shaped frame.

2. A splicable flow measuring device suitable for measuring large cross-section flow according to claim 1, characterized in that: Multiple total pressure measuring devices and static pressure measuring devices are installed according to different flow measurement point selection methods, such as the Chebyshev method or the equal cross-section method. There is no restriction on the flow measurement point selection method.

3. The connectable flow measuring device suitable for measuring large cross-section flow according to claim 1, characterized in that: The material of the strap is composed of iron sheet and elastic rubber, with the rubber covering the iron sheet, and the length of the strap is three-quarters of the circumference of the cross-section of the ladder-shaped structure.

4. A splicable flow measuring device suitable for measuring large cross-section flow according to claim 3, characterized in that: The length of the iron sheet is two-thirds of the circumference of the ladder-shaped frame cross section.

5. The connectable flow measuring device suitable for measuring large cross-section flow according to claim 1, characterized in that: During operation, the main frame of the flow measuring device is placed in the fluid channel to be measured and fixed using pipe socket No. 1 and pipe socket No.

2. Pipe socket No. 1 and pipe socket No. 2 are welded to the fluid pipeline to be measured. The sampling hole of the total pressure measuring device is placed facing the wind, and the sampling hole of the static pressure measuring device is placed leeward.

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