WO2020000531A1

WO2020000531A1 - Air speed measurement device, air valve and air volume adjustment system

Info

Publication number: WO2020000531A1
Application number: PCT/CN2018/096047
Authority: WO
Inventors: 阮红正; 唐光野; 卢丙利
Original assignee: 倚世节能科技（上海）有限公司
Priority date: 2018-06-29
Filing date: 2018-07-18
Publication date: 2020-01-02
Also published as: CN108845158B; CN108845158A

Abstract

An air speed measurement device (100), an air valve (300) and an air volume adjustment system (400), the air speed measurement device (100), when in communication with an air duct (200), being able to measure the air speed through a circular ventilation cross-section S with a diameter D in the air duct (200). The air speed measurement device (100) comprises at least one anemoscope, the anemoscope being an impeller anemoscope (110); the rotation plane of an impeller of the impeller anemoscope (110) can be configured to be perpendicular to the central axis of the circular ventilation cross-section S. The present invention provides the air speed measurement device (100), the air valve (300) and the air volume adjustment system (400), the air speed in the air duct (200) is measured by means of the impeller anemoscope (110), and specifically, the average air speed passing through the impeller rotation plane is measured, such that the influence of a swirling air flow can be avoided, and a large fluctuation would not be caused during a short time period; and compared with the point measurement method in the prior art, the present invention has strong anti-fluctuation, anti-corrosion and anti-interference capabilities, being able to achieve higher measurement accuracy.

Description

Air speed measuring device, air valve and air volume adjustment system

Technical field

The invention relates to the field of wind speed measurement, in particular to a wind speed measurement device, a wind valve and an air volume adjustment system.

Background technique

The air volume adjustment system is widely used in the fields of construction, machinery, etc., and is used to adjust the ventilation volume inside the construction or machinery and equipment to adjust the temperature, humidity, and air pressure in the interior space of the construction or machinery to a favorable state. For example, it is installed in the building structure to ensure the safety and comfort of indoor personnel; it is installed in the mechanical equipment to ensure the stable operation of the equipment, or to ensure the quality of the processed products, and so on. Among them, in some occasions, there are very high requirements for the adjustment accuracy of the air volume adjustment system, such as clean workshops, hospital operating rooms, etc., it is necessary to accurately adjust the indoor ventilation volume through the air volume adjustment system to ensure that the indoor environment is clean and to control it. The internal air pressure is in a positive pressure state; for example, in a chemical laboratory, in order to ensure the health of laboratory personnel and avoid the spread of harmful gases in the room, it is necessary to exhaust harmful gases in a timely manner and strictly control the indoor air pressure to a negative pressure state.

The air volume adjustment system is in communication with the ventilation duct (air pipe) of the building structure or mechanical equipment, and includes a variable opening air valve. The air volume in the air pipe can be adjusted by adjusting the opening of the air valve, thereby adjusting the indoor air volume. Before using the air valve to adjust the air volume in the air pipe, first measure the wind speed, and use the measurement result as the basis for the air volume adjustment. In the prior art, the main instruments for measuring the wind speed in the air duct are pitot tubes and thermal anemometers. The common feature is that the measured wind speed is the wind speed at a certain point on the cross section of the air duct, that is, the wind speed is measured using the above-mentioned wind speed monitoring device. The method is point measurement. The specific process is as follows: first, set multiple measurement points on the cross section of the air duct, set a wind speed monitoring device (such as a pitot tube, etc.) on each measurement point, and measure multiple measurement points. The wind speed is measured at the same time. Finally, the measured wind speeds at each measurement point are averaged to obtain the average wind speed in the wind pipe. However, due to the influence of the roughness of the inner wall of the air duct, the air flow inside the air duct is not ideal but inevitably exists turbulence, that is, a vortex air current exists in the air flow in the air duct. When the measurement point is located in the vortex airflow, the measured wind speed value at the measurement point cannot reflect the true wind speed value in the duct. In addition, as the vortex airflow moves, the wind speed value measured at the same measurement point will produce a large fluctuation in a short time, and the fluctuation may be considered as noise by the control system and filtered by the filter.

Therefore, the prior art wind speed measuring device has poor anti-fluctuation and anti-interference capabilities, and it is difficult to obtain the true wind speed in the air duct stably, thereby making it impossible to accurately adjust the air volume in the air duct.

Summary of the invention

An object of the present invention is how to improve the measurement accuracy of the wind speed in the air duct.

In order to solve the above problem, the present invention provides a wind speed measuring device that can be used to measure the wind speed in a circular ventilation section with a diameter D in the air pipe when communicating with the air pipe. The wind speed measuring device includes at least one anemometer The anemometer is an impeller anemometer; the rotation surface of the impeller of the impeller anemometer may be set to be perpendicular to the central axis of the circular ventilation section.

Optionally, the circular ventilation section is perpendicular to the longitudinal axis of the air duct.

Optionally, a plurality of the dividing lines divide the circular ventilation section into a plurality of fan-shaped regions along the circumferential direction, and at least one of the impeller anemometers is provided on each of the dividing lines.

Optionally, the center of each of the impeller anemometers is located on the dividing line, and the areas of each of the fan-shaped regions are equal to each other.

Optionally, the wind speed measuring device includes a housing, at least a part of an inner wall of the housing is configured as a cylindrical inner wall with a diameter D, and the cylindrical inner wall is provided with a plurality of support beams, and a plurality of the supports. The positions of the beams correspond to the positions of a plurality of the dividing lines, and at least one of the impeller anemometers is provided on each of the supporting beams.

Optionally, the support beam is detachably disposed on the cylindrical inner wall.

Optionally, the number of the impeller anemometers is n, and n≥2, and the distance from the center of the i-th impeller anemometer to the central axis of the circular ventilation section is defined as R _i , i = 1, ..., n, and R _i is defined as the circular cross section of the vent nearest distance from the center axis of the impeller anemometer started in ascending order of distance, wherein, when n = 2, R ₁ = (0.25 to 0.27) D, R ₂ = (0.29 to 0.31) D; when n = 3 to 7, R _i <D / 2; | R _i / R _i-1 -R _i-1 / R _i-2 | ∈ [0.03, 0.3].

Optionally, when n = 3-7, R _i <D / 2; | R _i / R _i-1 -R _i-1 / R _i-2 | ∈ [0.05, 0.25].

Optionally, the diameter of the circular ventilation section D = 200-350mm, the number of the impeller anemometers is 3, and the center of the 3 anemometers is away from the central axis of the circular ventilation section. The distances are R ₁ = (0.15 to 0.225) D, R ₂ = (0.236 to 0.268) D, and R ₃ = (0.325 to 0.4) D.

Optionally, the ratio of the closest distance between the m-th point on the rotating surface of the impeller to the boundary of the circular ventilation section and the diameter D of the circular ventilation section is a _m , and the set A = {a ₁ , A ₂ , ..., a _m , ..., a _∞ }; in the Chebechev measuring point arrangement method for defining a circular cross section, the k-th measuring point located on the same radius is away from the circular cross section The ratio of the closest distance of the boundary to the diameter of the circular section is b _k , and the set B = {b ₁ , b ₂ ,..., B _k ,..., B _p }, where p is a Chebeche with a circular section. In the method, the number of measuring points located on the same radius; wherein the set A and the set B satisfy: B ∈ A.

The wind speed measuring device provided by the present invention is an impeller type anemometer, which measures the wind speed on a surface (ie, the ventilation section of the impeller type anemometer), which is relative to the point measurement method of the prior art. The interference from the vortex airflow is very small, that is, the vortex airflow basically does not affect the wind speed value measured by the impeller anemometer, and the wind speed measured by the impeller anemometer can be regarded as the true wind speed through its ventilation section. Therefore, compared with the point measurement method in the prior art, the present invention uses an impeller anemometer to measure the wind speed and volume in the duct, and has stronger anti-interference and anti-fluctuation capabilities, and can achieve higher measurement and control accuracy.

The invention also provides a damper, which includes a cylindrical valve body with an inner diameter of D, a driving device, and at least one blade provided in the valve body. The driving device can drive the blade to rotate to adjust the valve. The opening degree of the air valve is further provided with at least one impeller type anemometer in the valve body, and the rotation surface of the impeller of the impeller type anemometer is perpendicular to the central axis of the valve body.

Optionally, the impeller anemometer and the driving device may be respectively connected to a controller, and the controller may control the blade rotation according to the wind speed measured by the impeller anemometer to adjust the damper Opening.

Optionally, the blades are fan-shaped blades distributed in the valve body along the circumferential direction of the valve body, and the plurality of blades can rotate around their respective rotation axes.

Optionally, the rotation axis of the blade is perpendicular to the central axis of the valve body.

Optionally, a plurality of mounting beams are provided in the valve body, and the plurality of mounting beams divide a cross section of the valve body into a plurality of fan-shaped regions in the circumferential direction, and each of the mounting beams is provided with at least One said impeller anemometer.

Optionally, the areas of the fan-shaped regions are equal to each other.

Optionally, the mounting beam is detachably installed in the valve body.

Optionally, the number of the impeller anemometers is n, and n≥2, and the distance from the center of the i-th impeller anemometer to the central axis of the valve body is defined as R _i , i = 1 , ..., n, and R _i is defined to be arranged in ascending order of distance starting from the impeller anemometer closest to the central axis of the valve body, where, when n = 2, R ₁ = (0.25-0.27 ) D, R ₂ = (0.29 ~ 0.31) D; when n = 3 ~ 7, R _i <D / 2; | R _i / R _i-1 -R _i-1 / R _i-2 | ∈ [0.03 , 0.3].

Optionally, the inner diameter D of the valve body is 200 to 350 mm, the number of the impeller anemometers is three, and the distances between the centers of the three impeller anemometers and the central axis of the valve body are R ₁ = (0.15 to 0.225) D, R ₂ = (0.236 to 0.268) D, and R ₃ = (0.325 to 0.4) D.

Optionally, the ratio of the closest distance between the m-th point on the rotating surface of the impeller to the inner wall of the valve body and the inner diameter D of the valve body is a _m , and the set A = {a ₁ , a ₂ , ……, a _m , ……, a _∞ }; the closest distance between the k-th measuring point on the same radius and the boundary of the circular section in the Chebechev measuring point arrangement method for defining a circular section The ratio to the diameter of the circular cross section is b _k , and the set B = {b ₁ , b ₂ ,..., B _k ,..., B _p }, where p is the Chebechev method of circular cross section. The number of measurement points located on the same radius; the set A and the set B satisfy: B ∈ A.

Optionally, the sum of the cross-sectional area of the impeller anemometer is not greater than 30% of the cross-sectional area of the valve body, the number of the blades is 2 to 12, and the height of the valve body is greater than or equal to 10.0 cm.

The air valve provided by the present invention integrates at least one impeller-type anemometer in the valve body of the air valve, and measures the wind speed passing through the valve body through the impeller-type anemometer. Because the impeller anemometer measures the wind speed on one surface (that is, the ventilation section of the impeller anemometer), compared to the point measurement method of the prior art, the interference from the vortex airflow is very small, so the vortex airflow does not affect the wind speed. The accuracy of the measurement is affected, and the wind speed measured by the impeller anemometer can be regarded as the true wind speed through its ventilation section. Therefore, compared with the point measurement method in the prior art, the damper provided by the present invention has strong anti-fluctuation and anti-interference capabilities, and can achieve higher measurement accuracy. In addition, the damper provided by the present invention integrates the impeller-type anemometer inside the damper, which can make the overall structure more compact than the combination of a multi-blade valve and a pitot tube in the prior art.

The present invention also provides an air volume adjustment system for adjusting the wind speed in the air duct, including a controller, a wind speed measuring device, and an air valve. The air speed measuring device and the air valve can communicate with the air duct, and the control The controller is respectively connected to the air valve and the wind speed measuring device, and the controller can control the opening degree of the air valve according to the wind speed measured by the wind speed measuring device; wherein the wind speed measuring device is the present invention The above-mentioned wind speed measuring device is provided.

Optionally, the damper is installed downstream of the wind speed measuring device in the direction of airflow flow, and the damper is a single-leaf butterfly valve or a multi-leaf valve.

The air volume adjustment system provided by the present invention includes a wind speed measuring device and a damper, and the wind speed measuring device and the damper are respectively connected to a controller. In this air volume adjustment system, an impeller anemometer is used to measure the wind speed in the air duct. Because the impeller anemometer measures the wind speed on a surface (that is, the ventilation section of the impeller anemometer), it is relative to the point of the prior art. The measurement method has little interference from the vortex airflow, so the vortex airflow will not affect the measurement accuracy of the wind speed. The wind speed measured by the impeller anemometer can be regarded as the true wind speed through its ventilation section. In addition, because the impeller anemometer measures the average wind speed of a surface, the wind speed value is a relatively stable value, and does not generate high-frequency components during the control process, which can prevent the control system from filtering out the effective wind speed value. Therefore, compared with the point measurement method in the prior art, the air volume adjustment system provided by the present invention has strong anti-fluctuation and anti-interference capabilities, can obtain higher wind speed measurement accuracy, and can more accurately adjust the air volume in the air duct. .

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1a is a structural diagram of a wind speed measuring device provided by the present invention; FIG.

1b is another structural diagram of a wind speed measuring device provided by the present invention;

1c is a structural diagram of an impeller anemometer;

2a is an anemometer arrangement diagram of a wind speed measuring device provided by the present invention;

FIG. 2b is another layout diagram of an anemometer for a wind speed measuring device provided by the present invention; FIG.

3 is a schematic diagram of a Chebychev method measuring point arrangement of a circular cross section;

4 is a structural diagram of a damper provided by the present invention;

5 is a structural diagram of an air volume adjustment system provided by the present invention;

6 is a structural diagram of another air volume adjustment system provided by the present invention;

7a to 7d are schematic structural diagrams of several wind speed measuring devices provided by the present invention;

8a to 8b are schematic diagrams of a wind speed measuring device provided by the present invention when applied to a curved pipe.

detailed description

The embodiments of the present invention will be described below with specific specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Although the description of the present invention will be described in conjunction with the preferred embodiment, this does not mean that the features of the present invention are limited to this embodiment. On the contrary, the purpose of the invention introduction in combination with the embodiments is to cover other options or modifications that may be extended based on the claims of the present invention. In order to provide an in-depth understanding of the present invention, many specific details will be included in the following description. The invention may also be practiced without these details. In addition, in order to avoid confusion or obscure the point of the present invention, some specific details will be omitted in the description.

In the description of the present invention, it should be noted that the terms "installation", "connected", and "connected" should be understood in a broad sense unless explicitly stated and limited otherwise. For example, they may be fixed connections or removable. Connected, or integrated. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis. In addition, "up", "down", "left", "right", "top", and "bottom" used in the following description should not be construed as limiting the present invention.

As described in the background section, the air volume adjustment system is used to adjust the air volume in the building structure and mechanical equipment. The specific adjustment process is: 1. Use the wind speed measuring device to measure the wind speed in the air duct; 2. Convert the measured wind speed into the air volume value in the air duct (for example, air volume = wind speed × cross-sectional area of the air duct); 3. The measured air volume value is compared with the actual air volume value. If they are not the same, the air volume value in the duct is adjusted to the actual air volume value by adjusting the opening of the air valve.

In the prior art, instruments for measuring the wind speed in a duct are mainly pitot tubes, thermal anemometers, etc., and their common feature is that the measured wind speed is the wind speed at a certain point on the cross section of the duct. When the measurement point is located in the vortex airflow, In some cases, the actual wind speed in the duct may not be measured, which may affect the measurement accuracy. In addition, when the air pipe is a curved pipe, the bend of the air pipe will affect the airflow in the pipe, and increase the unevenness of the airflow in the airpipe. The existing point measurement method is more susceptible to interference by uneven airflow, and it is difficult to measure accurately. Wind speed. For example, when using a pitot tube to measure the wind speed in an air pipe, the length of the straight pipe part needs to reach 8 to 13 times the diameter of the wind speed measuring device to meet the measurement and control accuracy requirements.

Furthermore, the pitot tube is prone to blockage, and the probe of the thermal anemometer is prone to corrosion, which will cause the pitot tube and the thermal anemometer to lose the wind speed measurement function, and further reduce the measurement accuracy of the wind speed measuring device.

The present invention adopts an impeller-type anemometer to measure the wind speed in the air duct. The average wind speed on one surface is obtained, and it has strong anti-interference, anti-corrosion and anti-fluctuation capabilities. Therefore, the technical solution provided by the present invention can avoid the The influence of uniform airflow is conducive to improving the measurement and control accuracy of wind speed and volume.

In order to make the foregoing objects, features, and advantages of the present invention more comprehensible, specific embodiments of the present invention are described below with reference to the accompanying drawings.

Referring to FIG. 1 a to FIG. 2 b, the present invention first provides a wind speed measuring device 100 that can communicate with an air pipe 200. When the wind speed measuring device 100 is in communication with the air pipe 200, it can be used to measure the wind speed in the air pipe 200. The inner wall of the air duct 200 may form a circular ventilation section S with a diameter D. The wind speed measuring device 100 is used to measure the wind speed in the circular ventilation section S. Based on the measured wind speed, the air velocity passing through the circular ventilation section S may be further calculated. Air volume (for example, air volume = wind speed × cross-sectional area of circular ventilation section S). The wind speed measuring device 100 includes at least one anemometer. In the present invention, the anemometer is an impeller anemometer 110. In FIG. 1 a, the number of impeller-type anemometers 110 included in the wind speed measuring device 100 is three, but the present invention is not limited thereto, and the number of impeller-type anemometers 110 included in the wind speed measuring device 100 may be other numbers.

The present invention does not limit the communication method between the wind speed measuring device 100 and the wind pipe 200. In one embodiment, as shown in FIG. 1a, the wind speed measuring device 100 has a housing 120, and the inner diameter of the air pipe 200 is equal to the inner diameter of the housing 120 (Both equal to the diameter D of the circular ventilation section S), the wind speed measuring device 100 is hermetically connected to the air duct 200 through its casing 120. In this embodiment, the casing 120 can be regarded as an integral part of the air duct 200. In another embodiment, as shown in FIG. 1 b, the wind speed measuring device 100 does not include a housing, but the impeller anemometer 110 is directly installed in the air pipe 200 through a bracket.

FIG. 1 c shows a structural diagram of an impeller anemometer 110. The impeller type anemometer 110 includes a support 111 and an impeller 112, and a sensing device is correspondingly arranged between the impeller 112 and the support 111. For example, a multi-stage magnetic ring is embedded in the impeller 112, and a frame 111 is fixedly disposed on the support 111.尔 ensor 113. When the airflow passes through the impeller 112, the impeller 112 is pushed to rotate. During the rotation of the impeller 112, the multi-stage magnetic ring provided on the impeller 112 cuts the Hall sensor 113, thereby generating an electrical signal in the Hall sensor 113. The counting can obtain the rotation speed of the impeller 112, and the speed of the airflow can be calculated according to the rotation speed of the impeller 112, that is, the wind speed. The impeller-type anemometer 110 has a structure existing in the prior art, and details are not described herein again.

In the present invention, the rotation surface of the impeller 112 may be set to be perpendicular to the central axis of the circular ventilation section S. Here, the plane on which the rotation surface of the impeller 112 is located is perpendicular to the central axis of the circular ventilation section S, but the rotation surface of the impeller 112 The central axes of the circular ventilation section S may or may not intersect. When the impeller 112 rotates under the impetus of the airflow, the wind speed passing through the ventilation section of the impeller type anemometer 110 can be calculated according to its rotational speed, and further based on the wind speed, the air volume passing through the ventilation section of the impeller type anemometer 110 (for example, the air volume) can be calculated. = Wind speed x ventilation cross-sectional area). In the present invention, the rotation surface of the impeller 112 is defined as: a point farthest from the central axis of the impeller 112 is selected on the outer contour of the blade of the impeller 112, and this point is formed by rotating a circle around the central axis of the impeller 112, The circular area is the rotation surface of the impeller 112.

It should be noted that, although the wind speed measurement device 100 provided by the present invention directly measures the wind speed value, the wind volume value can be obtained through conversion. That is to say, the wind speed measuring device provided by the present invention can also be used as an air volume measuring device, and the measured air volume value can be used as the adjustment basis of the air volume adjusting system.

As mentioned above, due to the influence of the surface roughness of the inner wall of the air duct, there will be a vortex airflow in the wind field, which affects the measurement accuracy of the conventional point measurement method. The wind speed measuring device provided by the present invention is used for measuring the wind speed. The wind speed meter is an impeller type anemometer, which measures the wind speed on one surface (that is, the ventilation section of the impeller type anemometer 110). Method, the interference by the vortex airflow is very small, that is, the vortex airflow basically does not affect the wind speed value measured by the impeller anemometer, and the wind speed measured by the impeller anemometer can be regarded as the true wind speed through its ventilation section. In summary, compared with the point measurement method in the prior art, the present invention uses an impeller anemometer to measure the wind speed and volume in the air duct, and has stronger anti-interference, anti-corrosion and anti-fluctuation capabilities, and can achieve higher measurement and control precision.

Optionally, the circular ventilation section S is perpendicular to the longitudinal axis of the air duct 200, and the air duct 200 may be a straight pipe or a curved pipe. When the air pipe 200 is a straight pipe, its longitudinal axis is a straight line; when the air pipe 200 is a curved pipe, its longitudinal axis is a curve. Because the wind speed measured by the impeller anemometer 110 is an average wind speed on its ventilation cross section, compared to the thermal anemometer and pitot tube (which measures the wind speed at a point, the area is very small, so it is impossible to balance the air duct. Air flow fluctuation), which can overcome the influence of uneven air flow on measurement accuracy due to the bending of the air pipe, that is, even when the air pipe 200 is a curved pipe, the wind speed measuring device 100 provided by the present invention can still obtain high accuracy. Wind speed and volume measurements.

Optionally, as shown in FIG. 2a and FIG. 2b, the number of impeller-type anemometers 110 included in the wind speed measuring device 100 is multiple, and each of the impeller-type anemometers 110 is located on a plurality of dividing lines of the circular ventilation section S, The multiple dividing lines divide the circular ventilation section S into a plurality of fan-shaped regions. That is, each dividing line extends in the radial direction of the circular ventilation section S, and at least one impeller-type anemometer 110 is provided on each dividing line. In one embodiment, as shown in FIG. 2a, the number of impeller anemometers 110 is equal to the number of dividing lines, and one impeller anemometer 110 is provided on each dividing line; in another embodiment, as shown in FIG. 2b As shown, the number of impeller anemometers 110 is greater than the number of dividing lines, and a plurality of impeller anemometers 110 may be disposed on a dividing line. Setting the impeller anemometer 110 on a plurality of dividing lines can make multiple impeller anemometers 110 evenly distributed in the housing 120 as much as possible, preventing mutual interference between the impeller anemometers 110 on the wind speed, making measurement The result is more accurate; the impeller anemometers 110 can also be arranged staggered as far as possible in the circumferential direction to avoid mutual interference between the impeller anemometers 110. In one embodiment, the center of each impeller anemometer 110 (refers to the rotation center of the impeller of the impeller anemometer 110) is located on the above-mentioned dividing line. Further, the plurality of dividing lines divide the area of the circular ventilation section S evenly, that is, the areas of the respective fan-shaped regions are equal to each other.

Optionally, as shown in FIG. 1 a, the wind speed measuring device 100 includes a housing 120, and at least a part of the inner wall of the housing 120 is configured as a cylindrical inner wall with a diameter D, that is, along the axial direction, the housing 120 includes at least A cylindrical inner wall with a diameter of D. This cylindrical inner wall of the casing 120 defines the circular ventilation section S described above, in which case the casing 120 can be considered as a component of the tube wall of the air duct 200. A plurality of support beams for supporting the impeller anemometer 110 are provided on the cylindrical inner wall, and at least one impeller anemometer 110 is provided on each support beam. The positions of the plurality of support beams correspond to the positions of the plurality of dividing lines, that is, the support beams extend along the radial direction of the cylindrical inner wall, and the plurality of support beams intersect on the central axis of the cylindrical inner wall. Connection flanges may be provided on both end faces of the housing 120, which is beneficial to achieving a sealed connection between the wind speed measuring device 100 and the air pipe 200. The support beam may be detachably connected to the cylindrical inner wall to facilitate replacement and maintenance of the impeller anemometer 110. It should be noted that, in FIG. 2 a and FIG. 2 b, the shaded portion may represent the casing 120 or the wall of the duct 200.

On a circular ventilation section S, the wind speed at each point may be different. Reasonably setting the layout position of the impeller anemometer 110 is beneficial to improving the measurement accuracy of the wind speed measuring device 100. Optionally, referring to FIG. 2a and FIG. 2b, the number of impeller anemometers 110 is n, and n≥2, and the center axis of the i-th impeller anemometer 110 from the central axis of the circular ventilation section S is defined. The distance is R _i , i = 1, ..., n, and R _i is limited to be arranged in ascending order of distance starting from the impeller anemometer 110 closest to the central axis of the circular ventilation section S, that is, R ₁ <R ₂ , R ₂ <R ₃ , ..., and so on. Wherein, when n = 2, R ₁ = (0.25 to 0.27) D, and R ₂ = (0.29 to 0.31) D; when n = 3 to 7, R _i <D / 2; | R _i / R _{i- 1-} R _i-1 / R _i-2 | ∈ [0.03, 0.3]. In a preferred embodiment, when n = 3-7, R _i <D / 2; | R _i / R _i-1 -R _i-1 / R _i-2 | ∈ [0.05, 0.25]. When the impeller-type anemometer 110 meets the above-mentioned arrangement rule, the measurement error of the wind speed and volume can be controlled within 5%.

If the number of the impeller anemometers 110 provided in the wind speed measuring device 100 is too small, the accuracy of the measurement will be affected; if the number of the impeller anemometers 110 is too large, it will occupy too much flow area and hinder the air flow. Optionally, when the diameter D of the circular ventilation section S = 200-350 mm, the number of the impeller anemometers 110 is three, and the distance between the center of the three impeller anemometers 110 and the central axis of the circular ventilation section S R ₁ = (0.15 to 0.225) D, R ₂ = (0.236 to 0.268) D, and R ₃ = (0.325 to 0.4) D. When the impeller anemometer 110 meets the above arrangement, the measured wind speed value and The difference between the actual wind speed values is within 0.3%. In one embodiment, the three impeller anemometers 110 are respectively disposed on three dividing lines of the circular ventilation section S, and the three dividing lines divide the central ventilation section into three fan-shaped regions with a center angle of 120 °.

Because of a circular ventilation section S in the air duct 200, the wind speed at each point is different. In the prior art, when measuring the wind speed of a circular cross section, a method of arranging a plurality of measuring points on the cross section (such as the Chebechev method) is used to obtain the average wind speed on the circular cross section. However, on the one hand, because of the poor anti-fluctuation ability of the point measurement method, the measured wind speed value at a single measurement point may be distorted; on the other hand, because the point measurement method is usually densely distributed, the volume of the impeller anemometer 110 itself The requirements are strict. In this case, the applicant found that when using the impeller anemometer 110 to measure the wind speed in the circular ventilation section S, if the rotating surface of the impeller anemometer 110 can cover all of the Chebychev method on a radius Corresponding measurement points (that is, the ratio of the range of the distance from the rotating surface of the impeller of the impeller type anemometer 110 to the boundary of the circular ventilation section S to the diameter D of the circular ventilation section S can cover all of the Chebechev method on a radius The corresponding proportional value of the measurement points) can significantly improve the measurement accuracy of wind speed and volume.

Specifically, the closest distance between the m-th point on the rotation surface of the impeller (referring to the sum of the rotation surfaces of all the impeller-type anemometers 100 included in the wind speed measuring device 100) to the boundary of the circular ventilation section S and the circular ventilation section are defined. The ratio of the diameter D of S is a _m and the set A = {a ₁ , a ₂ , ..., a _m , ..., a _∞ }, that is, the set A includes all the impeller rotating surfaces of the impeller anemometer 110 Corresponding ratios for all points on the graph. At the same time, in the Chebechev measuring point arrangement method for defining a circular section, the ratio of the closest distance of the k-th measuring point on the same radius to the boundary of the circular section to the diameter of the circular section is b _k , and the set is B = {b ₁ , b ₂ , ..., b _k , ..., b _p }, where p is the number of measuring points located on the same radius in the Chebechev method with a circular cross section, that is, the set B Corresponding ratios of all the measurement points of the Chebechev method on the same radius are included. When the relationship between the set A and the set B satisfies B ∈ A, the measurement accuracy of the wind speed measuring device 100 can be significantly improved.

To facilitate understanding, a certain wind speed measuring device 100 is taken as an example to explain the relationship between the set A and the set B. In this wind speed measuring device 100, the diameter D of the circular ventilation section S is 252 mm. The wind speed measuring device 100 includes three impeller anemometers 110, and the closest distances between the centers of the three impeller anemometers 110 to the cylindrical inner wall are 41.5 mm, 63 mm, and 74 mm in sequence. The diameter is 67mm, which can be calculated from the above data, and the set A = [0.032, 0.427]. For a circular section with a diameter of 252mm, the Chebychev method's layout requirements are (as shown in Figure 3): the area of the circular section is divided into 6 equal parts by using 3 diameters (6 radii). Three measurement points are arranged on the bar radius according to a certain rule-the outermost measurement point, the middle measurement point, and the closest measurement point to the center. The ratio of the closest distance from the circular section boundary to the circular section diameter D is 0.032, 0.135, 0.321, that is, set B = {0.032, 0.135, 0.321}. Therefore, the wind speed measuring device 100 provided in this example satisfies B ∈ A. However, the arrangement of the impeller anemometer 110 is not limited to this, and any arrangement that satisfies B ∈ A is within the protection scope of the present invention.

Referring to FIG. 4, the present invention also provides a damper 300. The damper 300 includes a cylindrical valve body 310 having an inner diameter D, a driving device 320, and at least one blade 330 disposed in the valve body 310. The driving device 320 may The driving blade 330 rotates to adjust the opening degree of the damper 300.

The valve body 310 is provided with at least one impeller-type anemometer 110. The rotation surface of the impeller 112 of the impeller-type anemometer 110 is perpendicular to the central axis of the valve body 310. Here, the plane on which the rotation surface of the impeller 112 is perpendicular to the central axis of the valve body 310. However, the rotation surface of the impeller 112 and the central axis of the valve body 310 may or may not intersect. When the impeller 112 rotates under the impetus of the airflow, the wind speed passing through the ventilation section of the impeller anemometer 110 can be calculated according to its rotation speed. The definition of the rotation surface of the impeller 112 is as described above, and is not repeated here.

The anemometer used to measure the wind speed of the present invention is an impeller anemometer, and the impeller anemometer is integrated inside the air valve. Compared with the method of combining the multi-blade valve and the pitot tube in the prior art to form an air volume adjustment system, Improving the measurement and control accuracy of wind speed and volume can also make the overall structure more compact and more convenient to install.

Optionally, the impeller anemometer 110 and the driving device 320 are respectively connected to a controller, and the controller can read the wind speed information measured by the impeller anemometer 110 and control the rotation of the blade 330 according to the wind speed information, thereby controlling the damper 300 degree of opening and closing. In this embodiment, the controller may be a component of the damper 300 or a device independent of the damper 300. Since the impeller-type anemometer 110 measures the average wind speed of a surface, the wind speed value is a relatively stable value, and does not generate high-frequency components in the control process, which can prevent the controller from filtering out the effective wind speed value. Therefore, compared with the point measurement method in the prior art, the damper provided by the present invention has strong anti-fluctuation and anti-interference capabilities.

Continuing to refer to FIG. 4, in this embodiment, the blades 330 are fan-shaped blades distributed in the valve body 310 along the circumferential direction of the valve body 310, and the multiple blades 330 can rotate about their respective rotation shafts 330 a. That is, the damper valve 300 of this embodiment is a multi-blade damper. Unlike a single-blade valve, the multi-blade valve includes multiple blades arranged along the circumferential direction of the valve body, and the airflow can pass between multiple blades at the same time. Therefore, compared with the single-blade damper, the multi-blade damper can reduce the interference to the airflow in the air duct 200, so that the flow field in the air duct 200 is more uniform. By integrating the impeller-type anemometer 100 in a multi-blade damper, a high measurement and adjustment accuracy can be achieved.

Optionally, the rotation axis of the blade 330 is perpendicular to the central axis of the valve body 310 to make the airflow behind the valve more uniform.

Optionally, the number of the blades 330 may be 2-12.

Optionally, a plurality of mounting beams 340 are distributed along a circumferential direction of a cross section of the valve body 310, and each mounting beam 340 is provided with at least one impeller anemometer 110. The cross section of the valve body 310 is circumferentially The plurality of mounting beams 340 are divided into a plurality of fan-shaped regions. That is, the mounting beam 340 extends in the radial direction of the valve body 310. In the damper 300 provided by the present invention, the number of the impeller anemometers 110 is plural, and the impeller anemometers 110 are arranged on a plurality of mounting beams 340, so that the plurality of impeller anemometers 110 are evenly distributed in the valve body 310 as much as possible. To prevent the mutual interference between the impeller anemometers 110 on the wind speed and make the measurement results more accurate; it can also make the impeller anemometers 110 staggered as far as possible in the circumferential direction to avoid mutual interference between the impeller anemometers 110 . Optionally, the plurality of mounting beams 340 divide the cross section of the valve body 310 uniformly, that is, the areas of the respective fan-shaped regions are equal to each other.

Optionally, the mounting beam 340 is detachably installed in the valve body 310 to facilitate replacement and maintenance of the impeller anemometer 110. Optionally, the height of the valve body 310 is greater than or equal to 10 cm, thereby providing more installation space for the installation beam 340 and further facilitating the installation and removal of the installation beam 340.

Further, the number of impeller anemometers 110 is n, and n ≧ 2; the distance between the center of the i-th impeller anemometer 110 and the central axis of the valve body 310 is defined as R _i , i = 1, ... , N, and R _i is defined to be arranged in ascending order of distance from the impeller anemometer 110 closest to the central axis of the valve body 310, that is, R ₁ <R ₂ , R ₂ <R ₃ ,... Wherein, when n = 2, R ₁ = (0.25 to 0.27) D, and R ₂ = (0.29 to 0.31) D; when n = 3 to 7, R _i <D / 2; | R _i / R _{i- 1-} R _i-1 / R _i-2 | ∈ [0.03, 0.3]. In one embodiment, when n = 3-7, R _i <D / 2; | R _i / R _i-1 -R _i-1 / R _i-2 | ∈ [0.05, 0.25]. When the impeller-type anemometer 110 meets the above-mentioned arrangement rule, the measurement error of the wind speed and volume can be controlled within 5%.

If the number of the impeller anemometers 110 provided in the damper 300 is too small, the measurement accuracy will be affected; if the number of the impeller anemometers 110 is too large, it will occupy too much flow area and hinder the air flow. Optionally, the inner diameter D of the valve body 310 is 200-350 mm, and the number of the impeller anemometers is three. The distances between the centers of the three impeller anemometers 110 and the central axis of the valve body 310 are R ₁ = (0.15 to 0.225) D, R ₂ = (0.236 to 0.268) D, and R ₃ = (0.325 to 0.4) D. In one embodiment, three impeller anemometers 110 are respectively disposed on three mounting beams 340 in the valve body 310, and the three mounting beams 340 divide the cross section of the valve body 310 into three center angles of 120 °. Sector area.

Further, the ratio of the closest distance between the m-th point on the rotating surface of the impeller (the rotating surfaces of all the impeller anemometers included in the damper 300 to the inner wall of the valve body 310 to the inner diameter D of the valve body 310) is defined as a _m and the set A = {a ₁ , a ₂ , ..., a _m , ..., a _∞ }; in the Chebychev measurement point arrangement method that defines a circular section, the first The ratio of the closest distance of the k measurement points to the boundary of the circular section to the diameter of the circular section is b _k , and the set B = {b ₁ , b ₂ , ..., b _k , ..., b _p }, where p In the Chebechev method with a circular cross section, the number of measurement points located on the same radius; wherein, when the set A and the set B satisfy B ∈ A, the measurement accuracy of the damper 300 can be significantly improved. That is, when the rotating surface of the impeller anemometer 110 can cover all corresponding measurement points on a radius of the Chebechev method (that is, the range value of the distance between the rotating surface of the impeller of the impeller anemometer 110 and the inner wall of the valve body 310 is The proportional value of the inner diameter of the valve body 200 can cover the corresponding proportional values of all measuring points on a radius of the Chebechev method), which can significantly improve the measurement accuracy of wind speed and volume.

Optionally, the sum of the cross-sectional area of the impeller anemometer 110 is not greater than 30% of the cross-sectional area of the valve body 310. For example, in the damper 300 shown in FIG. 4, the diameter of the valve body 310 is 252 mm, and three impeller anemometers 110 are arranged therein. Each impeller anemometer 110 has a diameter of 67 mm. The ratio of the sum of the cross-sectional areas to the cross-sectional area of the valve body 310 was 21.2%. Since the impeller anemometer 100 itself occupies a certain flow area, when the cross-sectional area of the impeller anemometer 100 itself is large, it will have a relatively obvious obstruction to the airflow. To compensate for this obstruction, the drive device needs to The damper 300 provides more torque and therefore consumes more power. In this embodiment, the flow area occupied by the impeller anemometer 110 is limited to a reasonable range by a reasonable setting of the external dimensions of the impeller anemometer 110.

Referring to FIG. 5 and FIG. 6, the present invention further provides an air volume adjustment system 400 that can be used to adjust the wind speed in the air duct 200. The air volume adjustment system 400 includes a controller, a damper 430 and a wind speed measuring device 100 provided by the present invention. The wind speed measuring device 100 and the air valve 430 may communicate with the air pipe 200. Specifically, the wind speed measuring device 100 and the air valve 430 may be disposed inside the air pipe 200, or as shown in FIG. 5 and FIG. 6, the wind speed measuring device 100 The housing 120 is hermetically connected to the air pipe 200 through its casing, and the air valve 430 is hermetically connected to the air pipe 200 through its valve body 431. In the present invention, the installation position of the controller is not limited. The controller is connected to the wind speed measuring device 100 and the air valve 430 respectively. The controller can read the wind speed measured by the wind speed measuring device 100 and adjust the opening degree of the air valve 430 according to the wind speed. When the air speed measuring device 100 and the air valve 430 can communicate with the air pipe 200, the controller can adjust the opening degree of the air valve 430 according to the wind speed measured by the air speed measuring device 100, thereby adjusting the air volume in the air pipe 200.

The air volume adjustment system 400 provided by the present invention uses an impeller anemometer to measure the wind speed in the air duct. Since the impeller anemometer measures the wind speed on one surface (that is, the ventilation cross section of the impeller anemometer), compared with the prior art, The point measurement method has little interference from the vortex airflow, so the vortex airflow does not affect the measurement accuracy of the wind speed. The wind speed measured by the impeller anemometer can be regarded as the true wind speed through its ventilation section. In addition, because the impeller anemometer measures the average wind speed of a surface, the wind speed value is a relatively stable value, and does not generate high-frequency components during the control process, which can prevent the control system from filtering out the effective wind speed value. Therefore, compared with the point measurement method in the prior art, the air volume adjustment system provided by the present invention has strong anti-fluctuation and anti-interference capabilities, can obtain higher wind speed measurement accuracy, and can more accurately adjust the air volume in the air duct. .

Further, the wind speed measuring device 100 is installed upstream of the air valve 430 along the flow direction of the air flow in the circular air pipe 200. Since the airflow at the wind speed measuring device 100 has not yet passed through the damper, the wind field at the position where the wind speed measuring device 100 is located can be regarded as a uniform wind field. Accurate measurement results, so that the air volume in the duct can be adjusted more accurately. In this embodiment, the damper 430 may be a single-blade butterfly valve (as shown in FIG. 5) or a multi-blade valve (as shown in FIG. 6).

Several specific embodiments of the present invention are listed below. In the following embodiments, the diameter of the rotating surface of the impeller anemometer 100 is 67 mm, and the actual wind speed in the air duct 200 is 5 m / s. It should be noted that the above-mentioned settings do not constitute a limitation on the present invention, and are merely simplified settings for highlighting the innovative points of the present invention.

[Example 1]

Please refer to FIG. 7a. In this embodiment, the wind speed measuring device 100 is in communication with the wind pipe 200. The wind speed measuring device 100 has a housing 120, and the housing 120 has a cylindrical inner wall. The cylindrical inner wall defines a diameter D = 200 mm. Circular ventilation section S. Two impeller anemometers 110 are arranged in the casing 120. The distances between the center of each impeller anemometer 110 and the central axis of the casing 120 are: R ₁ = 52 mm for anemometer 1 and R ₂ = for anemometer ₂ = 59.5mm.

Set the actual wind speed in the duct to 5m / s (when testing the wind speed measuring device 100, the actual wind speed in the duct can be set by the wind generator), the wind speed values measured by each impeller anemometer 110 are in order 4.9669m / s, 5.0327m / s, taking the average value of the above wind speed values, the final measured wind speed value is 4.9998m / s. That is, using the wind speed measuring device 100 provided in this embodiment, the difference between the measured wind speed value and the actual wind speed value (5m / s) is 0.00%, which meets the requirements for use.

[Example 2]

Please refer to FIG. 7b. In this embodiment, the wind speed measuring device 100 communicates with the wind pipe 200. The housing 120 of the wind speed measuring device 100 has a cylindrical inner wall. The cylindrical inner wall defines a circle with a diameter D = 250 mm. Shaped ventilation section S. Three impeller anemometers 110 are arranged in the housing 120. The distances between the center of each impeller anemometer 110 and the central axis of the wind pipe 200 are: R ₁ = 52 mm for anemometer 1 and R ₂ = 63 mm for anemometer 2 , The anemometer 3 is R ₃ = 84.5mm.

The actual wind speed in the air duct is set to 5m / s, and the wind speed values measured by each impeller anemometer 110 are 4.86m / s, 4.97m / s, and 5.12m / s. Take the average value of the above wind speed values, and finally get The measured wind speed is 4.98m / s. That is, by using the wind speed measuring device 100 provided in this embodiment, the difference between the measured wind speed value and the actual wind speed value (5m / s) is 0.04%, which meets the requirements for use.

[Example 3]

Please refer to FIG. 7c. In this embodiment, the wind speed measuring device 100 is in communication with the wind pipe 200. The housing 120 of the wind speed measuring device 100 has a cylindrical inner wall, and the cylindrical inner wall defines a circle with a diameter D = 500 mm. Shaped ventilation section S. Five impeller anemometers 110 are arranged in the casing 120. The distances between the center of each impeller anemometer 110 and the central axis of the casing 120 are: R ₁ = 52 mm for anemometer 1 and R ₂ = for anemometer ₂ = 85 mm, anemometer 3 is R ₃ = 130 mm, anemometer 4 is R ₄ = 169 mm, and anemometer 5 is R ₅ = 208 mm.

The actual wind speed in the duct is set to 5m / s, and the wind speed values measured by each impeller anemometer 110 are 4.67m / s, 4.91m / s, 5.05m / s, 5.15m / s, 5.19m / s, Taking the average value of the above wind speed values, the finally obtained wind speed measurement value is 4.99 m / s. That is, by using the wind speed measuring device 100 provided in this embodiment, the difference between the measured wind speed value and the actual wind speed value (5m / s) is 0.10%, which meets the requirements for use.

[Example 4]

Please refer to FIG. 7d. In this embodiment, the wind speed measuring device 100 communicates with the wind pipe 200. The housing 120 of the wind speed measuring device 100 has a cylindrical inner wall. The cylindrical inner wall defines a circle with a diameter D = 750mm. Shaped ventilation section S. Seven impeller anemometers 110 are arranged in the casing 120. The distances between the centers of the impeller anemometers 110 and the central axis of the casing 120 are: R ₁ = 75 mm for anemometer 1 and R ₂ = for anemometer ₂ = 115 mm, anemometer 3 is R ₃ = 161 mm, anemometer 4 is R ₄ = 204 mm, anemometer 5 is R ₅ = 245 mm, anemometer 6 is R ₆ = 310 mm, and anemometer 7 is R ₇ = 333 mm.

The actual wind speed in the duct is set to 5m / s, and the wind speed values measured by each impeller anemometer 110 are 4.93m / s, 5.15m / s, 5.25m / s, 5.28m / s, 5.3m / s, 5.34m / s, 5.42m / s, take the average value of the above wind speed values, and finally get the measured wind speed value of 5.18m / s. That is, by using the wind speed measuring device 100 provided in this embodiment, the difference between the measured wind speed value and the actual wind speed value (5m / s) is 3.60%, which meets the requirements for use.

[Example 5]

8a and 8b, the wind speed measuring device 100 used in this embodiment is the same as the wind speed measuring device used in embodiment 2, but in this embodiment, the wind pipe 200 is a curved pipe. Specifically, the air duct 200 includes a straight section 201 and a curved section 202. The wind speed measuring device 100 is disposed at an end of the straight section 201 near the curved section 202. FIG. 8b shows the air velocity distribution in the air duct 200, where the darker the color, the greater the air velocity.

The wind speed in the wind pipe 200 is measured by using the wind speed measuring device 100 provided in the embodiment 2. The wind speed values measured by each impeller anemometer 110 are 4.865 m / s, 5.248 m / s, and 4.818 m / s in order. The average value of the above-mentioned wind speed value, the finally obtained wind speed measurement value is 4.977m / s, that is, the difference between the measured wind speed value and the actual wind speed value (5m / s) is 0.04%, which meets the requirements for use.

The above embodiments provided by the present invention merely illustrate the principle of the present invention and its effects, but are not intended to limit the present invention. Anyone familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field to which they belong without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

A wind speed measuring device which can be used to measure the wind speed in a circular ventilation section with a diameter D in the air pipe when communicating with the wind pipe, characterized in that the wind speed measuring device comprises at least one anemometer, the anemometer Impeller anemometer;

The rotating surface of the impeller of the impeller anemometer may be set to be perpendicular to the central axis of the circular ventilation section.
The wind speed measuring device according to claim 1, wherein the circular ventilation section is perpendicular to a longitudinal axis of the air duct.
The wind speed measuring device according to claim 1, wherein a plurality of dividing lines divide the circular ventilation section into a plurality of fan-shaped regions along the circumferential direction, and at least one of the impellers is provided on each of the dividing lines. Anemometer.
The wind speed measuring device according to claim 3, wherein a center of each of the impeller anemometers is located on the dividing line, and areas of each of the fan-shaped regions are equal to each other.
The wind speed measuring device according to claim 3, wherein the wind speed measuring device comprises a housing, at least a part of an inner wall of the housing is configured as a cylindrical inner wall having a diameter D, and the cylindrical inner wall is provided on the cylindrical inner wall. There are a plurality of support beams, and the positions of the plurality of support beams correspond to the positions of the plurality of dividing lines one by one. Each of the support beams is provided with at least one of the impeller anemometers.
The wind speed measuring device according to claim 5, wherein the support beam is detachably disposed on the cylindrical inner wall.
The wind speed measuring device according to claim 3, wherein the number of the impeller anemometers is n, and n≥2, and the i-th anemometer anemometer is defined as the center distance from the circular ventilation. cross section from the central axis as R i, i = 1, ... , n, and R i is defined nearest the impeller anemometer started in ascending order of the distance to the circular cross section of the ventilation distance from the center axis, among them,

When n = 2, R 1 = (0.25 to 0.27) D, and R 2 = (0.29 to 0.31) D;

When n = 3 to 7, R i <D / 2; | R i / R i-1 -R i-1 / R i-2 | ∈ [0.03, 0.3].
The wind speed measuring device according to claim 7, characterized in that when n = 3 to 7, R i <D / 2; | R i / R i-1 -R i-1 / R i-2 | ∈ [0.05, 0.25].
The wind speed measuring device according to claim 7, characterized in that the diameter of the circular ventilation section D = 200-350 mm, the number of the impeller anemometers is three, and three of the impeller anemometers The distances from the center to the center axis of the circular ventilation section are R 1 = (0.15 to 0.225) D, R 2 = (0.236 to 0.268) D, and R 3 = (0.325 to 0.4) D.
The wind speed measuring device according to claim 1, wherein:

The ratio of the closest distance between the m-th point on the rotating surface of the impeller to the boundary of the circular ventilation section and the diameter D of the circular ventilation section is a m , and the set A = {a 1 , a 2 , ..., a m , ..., a ∞ };

In the Chebechev measuring point arrangement method for defining a circular section, the ratio of the closest distance between the k-th measuring point on the same radius to the boundary of the circular section to the diameter of the circular section is b k , And the set B = {b 1 , b 2 , ..., b k , ..., b p }, where p is the number of measuring points located on the same radius in the Chebechev method with a circular cross section;

Wherein, the set A and the set B satisfy: B ∈ A.
An air valve includes a cylindrical valve body with an inner diameter of D, a driving device, and at least one blade provided in the valve body. The driving device can drive the blade to rotate to adjust the opening of the air valve. Degree, which is characterized by,

At least one impeller-type anemometer is also provided in the valve body, and the rotation surface of the impeller of the impeller-type anemometer is perpendicular to the central axis of the valve body.
The damper according to claim 11, wherein the impeller anemometer and the driving device are respectively connected to a controller, and the controller can control the air velocity measured by the impeller anemometer The blade rotates to adjust the opening degree of the damper.
The damper according to claim 11, wherein the blade is a plurality of fan-shaped blades distributed in the valve body along the circumferential direction of the valve body, and the plurality of blades are rotatable about their respective rotation axes. .
The damper according to claim 13, wherein a rotation axis of the blade is perpendicular to a central axis of the valve body.
The damper according to claim 13, wherein a plurality of mounting beams are provided in the valve body, and the plurality of mounting beams divide a cross section of the valve body into a plurality of fan-shaped regions along a circumferential direction, Each said mounting beam is provided with at least one said impeller type anemometer.
The damper according to claim 15, wherein the areas of each of the sector regions are equal to each other.
The damper according to claim 15, wherein the mounting beam is detachably mounted in the valve body.
The damper according to claim 15, wherein the number of the impeller anemometers is n, and n≥2, and the center of the i-th impeller anemometer is defined from the center of the valve body. axis is the distance R i, i = 1, ... , n, and R i is defined as the ascending order of distance from the center axis of the valve body from the nearest wheel anemometer, wherein

When n = 2, R 1 = (0.25 to 0.27) D, and R 2 = (0.29 to 0.31) D;

When n = 3 to 7, R i <D / 2; | R i / R i-1 -R i-1 / R i-2 | ∈ [0.03, 0.3].
The damper according to claim 18, wherein when n = 3 to 7, R i <D / 2; | R i / R i-1 -R i-1 / R i-2 | ∈ [ 0.05, 0.25].
The damper according to claim 18, wherein the inner diameter D of the valve body is 200-350 mm, the number of the impeller anemometers is three, and the center distance of the three impeller anemometers is three. The distances between the central axes of the valve body are R 1 = (0.15 to 0.225) D, R 2 = (0.236 to 0.268) D, and R 3 = (0.325 to 0.4) D.
The damper according to claim 11, wherein:

The ratio of the shortest distance between the m-th point on the rotating surface of the impeller to the inner wall of the valve body and the inner diameter D of the valve body is a m , and the set A = {a 1 , a 2 , ..., a m , ..., a ∞ };

In the Chebechev measuring point arrangement method for defining a circular section, the ratio of the closest distance between the k-th measuring point on the same radius to the boundary of the circular section to the diameter of the circular section is b k , And the set B = {b 1 , b 2 , ..., b k , ..., b p }, where p is the number of measuring points located on the same radius in the Chebechev method with a circular cross section;

The set A and the set B satisfy: B ∈ A.
The damper according to any one of claims 11 to 21, wherein the sum of the cross-sectional area of the impeller anemometer is not greater than 30% of the cross-sectional area of the valve body, and the number of the blades is 2 ～ 12 pieces, the height of the valve body is greater than or equal to 10.0 cm.
An air volume adjustment system for adjusting the air volume in an air pipe includes a controller, a wind speed measuring device, and an air valve. The air speed measuring device and the air valve can communicate with the air pipe, and is characterized in that the controller Respectively connected to the air valve and the wind speed measuring device, and the controller may control the opening degree of the air valve according to the wind speed measured by the wind speed measuring device;

The wind speed measuring device is a wind speed measuring device according to any one of claims 1 to 10.
The air volume adjustment system according to claim 23, wherein the damper is installed downstream of the wind speed measuring device in a flow direction of the airflow, and the damper is a single-leaf butterfly valve or a multi-leaf valve.