Visual air flow indicator and method of measuring deodorizing duct air volume

Abstract

The application discloses a visual air flow indicator, a fixed shaft is arranged in a transparent cylinder, a wind disc is installed on the fixed shaft through a bearing and can rotate around the fixed shaft, and a plurality of air holes are formed in the wind disc; a scale is arranged on the side of the transparent cylinder. Gases enter the transparent cylinder from the bottom of the cylinder, the wind disc is pushed to rotate when the gases pass through the air holes of the wind disc, the wind disc is suspended in the transparent cylinder, and the size of the air volume can be obtained by the position of the wind disc corresponding to the scale. The visual air flow indicator has the advantages that the deodorization air pipe provided with the visual air flow indicator can be observed to read the air volume in the deodorization air pipe in real time and accurately, so that the air volume in the deodorization air pipe can be adjusted on site, the cost is far lower than that of the vortex street type and the insertion type gas flow meters on the market, and the flow data can be read more conveniently, which is a great breakthrough in the air volume monitoring of the deodorization air pipe of the sewage treatment plant.

Description

Technical Field

[0001] This invention relates to the field of monitoring airflow velocity in deodorizing ducts, and specifically to a visual airflow indicator. Background Technology

[0002] Currently, the air flow indicator in traditional deodorizing ducts uses three red ribbons or flame-shaped airflow strips to observe whether gas is being discharged from the duct. This method has the following drawbacks: 1) The air flow indicator cannot display the relative amount of airflow in the deodorizing duct; 2) The flame-shaped airflow strips can block the backflow of condensate, causing condensate to accumulate on the pipe for a long time and corrode the pipe.

[0003] However, flow meters that can accurately display readings are expensive and cannot be widely used. Summary of the Invention

[0004] The purpose of this invention is to provide a visual airflow indicator that can intuitively and accurately read the airflow in the deodorizing duct.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows: A visual airflow indicator, comprising a transparent cylinder, wherein the top and bottom of the transparent cylinder are provided with through holes, characterized in that the transparent cylinder contains... A fixed shaft is fixed at the center of the transparent cylinder. A fan plate, which is mounted on a fixed shaft via bearings and can rotate around the fixed shaft, and has several air holes on it; The spring is sleeved outside the fixed shaft. The spring is divided into two parts: an upper spring located above the fan plate and a lower spring located below the fan plate. Its function is to provide different elastic forces when the fan plate is suspended in different positions. A scale, which is located on the side of the transparent cylinder; Gas enters the transparent cylinder from the bottom. As the gas passes through the air holes of the fan plate, it drives the fan plate to rotate, causing the fan plate to hover inside the transparent cylinder. The air volume is obtained by observing the position of the fan plate on the scale.

[0006] Furthermore, the upper end of the transparent cylinder is provided with an upper flange, and a Y-shaped bracket is provided inside the upper flange; the lower end of the transparent cylinder is provided with a lower flange, and a Y-shaped bracket is provided inside the lower flange; the upper end of the fixed shaft is fixed to the center of the Y-shaped bracket of the upper flange, and the lower end is fixed to the center of the Y-shaped bracket of the lower flange; the upper spring is provided between the fan plate and the upper flange, and the lower spring is provided between the fan plate and the lower flange.

[0007] Furthermore, the fan disc has a mounting hole at its center for mounting a bearing, and several strip holes are evenly distributed radially around the mounting hole. The outer ring of the fan disc has multiple circular holes evenly distributed.

[0008] Furthermore, one side of the strip-shaped hole is beveled, so that when the gas passes through the strip-shaped hole, it drives the fan to rotate.

[0009] Preferably, the opening ratio of the fan coil unit is within the range of 8.8% to 35.18%.

[0010] Preferably, the slope of the bevel of the strip hole in the fan plate is 30°~42°, and the length of the strip hole does not exceed 28% of the diameter of the fan plate.

[0011] Furthermore, the visible airflow indicator is installed on the vertical deodorization duct, and the bottom flange of the transparent cylinder is connected to the vertical deodorization duct to measure the airflow in the deodorization duct.

[0012] Furthermore, the flow indicator's fan disc, fixed shaft, upper flange, and lower flange are all made of stainless steel, while the transparent cylinder is made of corrosion-resistant plastic.

[0013] Another objective of this invention is to provide a method for measuring the air volume of a deodorizing duct using a visual airflow indicator, which can intuitively and accurately read the air volume in the deodorizing duct.

[0014] To achieve the above objectives, the technical solution of the present invention is as follows: A method for measuring the air volume of a deodorizing duct using a visual air flow indicator, characterized in that the method includes the following steps: A. A visual airflow indicator is installed on a vertical deodorizing duct. The visual airflow indicator includes a transparent cylinder with a lower flange at the bottom. A fixed shaft is located inside the transparent cylinder, and a fan disc is mounted on the fixed shaft via bearings and can rotate around the fixed shaft. The fan disc has several air holes. A scale is provided on the side of the transparent cylinder, and the lower flange at the bottom of the transparent cylinder is connected to the vertical deodorizing duct. B. Close the air volume regulating valve in the deodorizing air duct. At this time, the fan coil is at the bottom and the air volume is 0. C. As the airflow regulating valve is opened, the odorous gas passes upward from below the visible airflow indicator through the fan plate. A portion of the gas is discharged through the small round holes on the fan plate, and another portion is discharged through the strip holes on the fan plate. One side of the strip holes has a slope. When the gas passes through the strip holes, it pushes the fan plate to rotate. The greater the airflow, the faster the rotation speed and the higher the fan plate is suspended. A scale is attached to the surface of the transparent cylinder, through which the airflow through the deodorizing air duct can be seen. D. When the air volume regulating valve is closed, the fan coil unit automatically returns to its initial position due to its own gravity.

[0015] This invention discloses a visual airflow indicator that can be installed on a deodorizing duct (vertically). It employs a fan disc structure that can rotate freely up and down around an axis. The fan disc's position varies depending on the airflow volume. By observing the scale on the transparent casing of the visual airflow indicator, the airflow volume in the deodorizing duct can be clearly read (higher airflow, higher fan disc height; lower airflow, lower fan disc height). Its advantages are: the airflow volume in the deodorizing duct can be read instantly and accurately by observing the scale, enabling on-site adjustment of the airflow. Its cost is significantly lower than currently available vortex or insertion-type gas flow meters, and it is much easier to read flow data, representing a major breakthrough in airflow monitoring for deodorizing ducts in existing wastewater treatment plants. Attached Figure Description

[0016] Figure 1 This is a front view of the present invention; Figure 2 This is a schematic diagram of a flange cover plate; Figure 3 This is a schematic diagram of a fan. Detailed Implementation

[0017] The present invention will now be further described with reference to the accompanying drawings.

[0018] like Figure 1 As shown, a visual airflow indicator includes a flange cover 1, a bracket 2, and a cylinder 3. The flange cover 1 is fixed to the upper and lower ends of the cylinder 3 and is co-centered with the cylinder 3. A fixed shaft 4 is fixed to the center of the cylinder 2 via the bracket 2. The fixed shaft 4 passes through the middle of a bearing 5, which is mounted on a bearing seat 5 and can rotate freely up and down along the fixed shaft. A fan disc 6 is fixed to the bearing seat 5, allowing the fan disc 6 to rotate freely up and down around the shaft inside the cylinder 3. The airflow rate can be read directly and accurately on a scale 7 based on the position of the fan disc 6. The cylinder 3 is made of transparent material to show the position of the fan disc 6 inside the cylinder. The scale is set on the transparent cylinder outside the airflow indicator, and the scale range and graduations on the scale can be customized according to the designed airflow value and pipe diameter. A spring is also fitted around the fixed shaft 4.

[0019] Furthermore, such as Figure 2 As shown, the flange cover plate 1 of the transparent cylinder is provided with a Y-shaped bracket, and the fixed shaft 4 is fixed on the Y-shaped bracket. Specifically, the upper end of the transparent cylinder is provided with an upper flange, and the upper flange is provided with a Y-shaped bracket; the lower end of the transparent cylinder is provided with a lower flange, and the lower flange is provided with a Y-shaped bracket; the upper end of the fixed shaft is fixed to the center of the upper flange Y-shaped bracket, and the lower end is fixed to the center of the lower flange Y-shaped bracket.

[0020] like Figure 3As shown, the fan plate has a mounting hole for mounting the bearing at its center, and several strip holes are evenly distributed radially around the mounting hole. The outer ring of the fan plate has multiple circular holes evenly distributed. The side of the strip hole is arranged radially along the fan plate. The width of the strip hole near the center of the fan plate is smaller, and the width near the outer ring of the fan plate is larger.

[0021] Furthermore, one side of the strip-shaped hole is beveled, so that when the gas passes through the strip-shaped hole, it drives the fan to rotate.

[0022] When the visual airflow indicator of this invention is installed on a vertical deodorizing duct, first close the airflow regulating valve in the deodorizing duct. At this time, the fan disc is at the bottom, and the airflow is 0. As the airflow regulating valve opens, as the odorous gas flows upward from below the flow indicator through the fan disc, some gas is discharged through the small round holes on the fan disc, and some gas is discharged through the strip-shaped holes on the fan disc. One side of the strip-shaped holes has a slope. When the gas passes through the strip-shaped holes, it pushes the fan disc to rotate. The greater the airflow, the faster the rotation speed, and the higher the fan disc hovers. An airflow scale is attached to the surface of the airflow indicator barrel, and the airflow through the duct can be seen through the scale. When the airflow regulating valve is closed, the fan disc will automatically return to the starting position under its own gravity.

[0023] The accuracy of an airflow indicator is determined by a variety of factors, including the diameter and number of circular holes, the bevel angle and number of bevels of strip holes, the diameter of the spring, the density of spring spacing, the length of the spring, the strength of the material, the friction between the shaft and the bearing seat, and the weight of the fan plate. If the orifice is too large and the number of orifices is too many, the fan coil unit will be unable to rotate, stop, or float up and down to indicate the airflow. If the orifice is too small and the number of orifices is too few, the fan coil unit will rotate to the top without accurately reading the flow rate. Based on experiments, empirical data suggests an orifice ratio between 8.8% and 35.18%. The thickness of the fan coil unit, the bevel angle, the number of bevels, and the size and quantity of orifices are determined by various factors, including the pipe diameter, the airflow rate, the performance of the spring, the friction between the shaft and bearings, and the weight of the fan coil unit. This requires complex calculations and multiple experiments to determine and verify. The airflow range for a Φ150 pipe diameter is 0-150m³ / h. 3 / h, some are 0-650m 3 Although the pipe diameter is the same, the measured air volume is different. This requires adjustment of various factors such as the number of holes, bevel angle, number of bevels, spring diameter, spacing density, material strength, spring performance, friction between shaft and bearing, and weight of fan plate.

[0024] According to a specific embodiment of the present invention, through testing and calculation, when the deodorizing duct is Φ150 and the duct diameter and air volume range is 0-150m³, 3At a speed of 8.8%, its opening ratio is 8.8%, and the weight of the fan coil unit is 67.65g~69.7g; while the air volume range is 0-650m³ / h. 3 At a rate of / h, its opening ratio is 35.18%, and the weight of the fan coil unit is 20.1g~22.39g.

[0025] The bevel angle and length are crucial factors in determining the rotation speed of the fan disc. A steeper bevel and a longer length result in a faster rotation speed, and vice versa. The fan disc's rotation speed cannot be too fast or too slow. Too fast a speed leads to excessive friction between the shaft and bearings, causing excessive wear and shortening their lifespan. Too slow a speed, on the other hand, results in limited airflow as the fan disc's own weight causes the air volume to increase from 0 to 60 m³ / h. 3 When the air volume is / h, the fan coil unit is still at the 0 position, while when the air volume is greater than 60m³ / h... 3 The fan disc suddenly flew up at / h. Calculations show that the fan disc's slope cannot be too large or too small, generally between 30° and 42°, and its length cannot be too long, generally not exceeding 28% of its diameter. The fan disc's rotation speed is generally 2.5 seconds per revolution, which needs to be calculated and experimentally determined.

Claims

1. A visual airflow indicator, comprising a transparent cylinder, wherein the top and bottom of the transparent cylinder are provided with through holes, characterized in that... The transparent cylinder is equipped with a fixed shaft, which is fixed at the center of the transparent cylinder. A fan plate, which is mounted on a fixed shaft via bearings and can rotate around the fixed shaft, and has several air holes on it; A spring, which is sleeved on the outside of the fixed shaft, is divided into two parts: an upper spring located above the fan plate and a lower spring located below the fan plate. Its function is to provide different elastic forces when the fan plate is suspended in different positions; a scale, which is located on the side of the transparent cylinder. Gas enters the transparent cylinder from the bottom. When the gas passes through the air holes of the fan plate, it drives the fan plate to rotate, causing the fan plate to hover inside the transparent cylinder. The air volume is obtained by observing the position of the fan plate on the scale. The fan plate has a mounting hole at its center for mounting a bearing, and several strip-shaped holes are evenly distributed radially around the mounting hole. The outer ring of the fan plate has multiple circular holes evenly distributed. One side of each strip-shaped hole has a bevel, so that when gas passes through the strip-shaped hole, it pushes the fan plate to rotate. The slope of the bevel of the strip-shaped hole in the fan plate is 30° to 42°, the length of the strip-shaped hole does not exceed 28% of the diameter of the fan plate, and the opening ratio of the fan plate is within 8.8% to 35.18%. The transparent cylinder has a straight cylindrical structure.

2. The visual airflow indicator as claimed in claim 1, characterized in that, The upper end of the transparent cylinder is provided with an upper flange, and a Y-shaped bracket is provided inside the upper flange; the lower end of the transparent cylinder is provided with a lower flange, and a Y-shaped bracket is provided inside the lower flange; the upper end of the fixed shaft is fixed to the center of the Y-shaped bracket of the upper flange, and the lower end is fixed to the center of the Y-shaped bracket of the lower flange; the upper spring is provided between the fan plate and the upper flange, and the lower spring is provided between the fan plate and the lower flange.

3. The visual airflow indicator as claimed in claim 2, characterized in that, The visual airflow indicator is installed on the vertical deodorization duct, and the bottom flange of the transparent cylinder is connected to the vertical deodorization duct to measure the airflow in the deodorization duct.

4. A method for measuring the airflow of a deodorizing duct using the visual airflow indicator as described in claim 1, characterized in that... The method includes the following steps: A. Installing a visual airflow indicator on a vertical deodorizing duct. The visual airflow indicator includes a transparent cylinder with a lower flange at the bottom. A fixed shaft is located inside the transparent cylinder, and a fan plate is mounted on the fixed shaft via a bearing and can rotate around the fixed shaft. The fan plate has several air holes. A scale is provided on the side of the transparent cylinder, and the lower flange at the bottom of the transparent cylinder is connected to the vertical deodorizing duct. B. Closing the airflow regulating valve in the deodorizing duct. At this time, the fan plate is at the bottom, and the airflow is 0. C. As the airflow regulating valve is opened, the odorous gas passes upward from below the visible airflow indicator through the fan plate. A portion of the gas is discharged through the small round holes on the fan plate, and another portion is discharged through the strip holes on the fan plate. One side of the strip holes has a slope. When the gas passes through the strip holes, it pushes the fan plate to rotate. The greater the airflow, the faster the rotation speed and the higher the fan plate is suspended. A scale is attached to the surface of the transparent cylinder, through which the airflow through the deodorizing air duct can be seen. D. When the air volume regulating valve is closed, the fan coil unit automatically returns to its initial position due to its own gravity.

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