CN216742884U - Air volume variable valve with wide air volume measurement range and air volume variable system - Google Patents
Air volume variable valve with wide air volume measurement range and air volume variable system Download PDFInfo
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- CN216742884U CN216742884U CN202122318514.XU CN202122318514U CN216742884U CN 216742884 U CN216742884 U CN 216742884U CN 202122318514 U CN202122318514 U CN 202122318514U CN 216742884 U CN216742884 U CN 216742884U
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Abstract
The utility model relates to a variable air volume valve with a wide air volume measuring range, which comprises a valve body and a pitot tube speed measuring device, wherein a parallelogram-shaped valve plate is arranged in the valve body, and one parallel opposite side of the valve plate is a downstream side; the corner of the valve plate is hinged through a rotating shaft, and the valve plate swings in the plane of the valve plate through the rotating shaft; the static pressure measuring tube of the pitot tube speed measuring device is formed by one of the two downstream sides extending out of the valve plate, and the full pressure measuring tube of the pitot tube speed measuring device is formed by the other downstream side extending out of the valve plate. Still provide a variable air volume system, including foretell amount of wind measuring range wide variable air volume valve. The utility model solves the problem of wind speed measurement accuracy under small air supply volume; the adoption sets up pitot tube speed sensor on the valve plate that moves, can carry out the translation and do not take place the change of direction according to the action of valve plate, and pitot tube speed sensor can follow the position of valve and move promptly, can not cause the precision decline of pipeline that tests the speed.
Description
Technical Field
The utility model relates to the technical field of valves, in particular to an air quantity variable valve with a wide air quantity measuring range and an air quantity variable system.
Background
The existing VAV variable air volume device has high requirement on air speed when measuring air volume and has low measurement precision on small air volume.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a variable air volume valve with a wide air volume measuring range and a variable air volume system, which can at least solve part of defects in the prior art.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions: a variable air volume valve with a wide air volume measuring range comprises a valve body and a pitot tube speed measuring device, wherein a valve plate in a parallelogram shape is arranged in the valve body, and one parallel opposite side of the valve plate is a downstream side; the corner of the valve plate is hinged through a rotating shaft, and the valve plate swings in the plane of the valve plate through the rotating shaft; the static pressure measuring tube of the pitot tube speed measuring device is formed by one of the two downstream sides extending out of the valve plate, and the full pressure measuring tube of the pitot tube speed measuring device is formed by the other downstream side extending out of the valve plate.
Further, a valve plate adjusting shaft is arranged on the other parallel opposite side of the valve plate.
Furthermore, four corners of the valve plate are hinged through the rotating shaft.
Furthermore, a sealing fixed stop block is arranged outside at least one downstream side.
The embodiment of the utility model provides another technical scheme: a variable air volume system comprises the variable air volume valve with wide air volume measuring range.
Further, the valve plate further comprises a controller for controlling the swing of the valve plate according to the set air volume.
Further, an angle sensor is arranged in the controller.
Compared with the prior art, the utility model has the beneficial effects that: the problem of the measurement accuracy of the wind speed under the condition of small air supply volume is solved; through adopting to set up pitot tube speed sensor on the valve plate that moves, can carry out the translation and do not take place the change of direction according to the action of valve plate, pitot tube speed sensor can follow the position of valve and move promptly, can not cause the precision decline of the pipeline that tests the speed.
Drawings
Fig. 1 is a schematic view of an air volume variable valve with a wide air volume measurement range according to an embodiment of the present invention;
in the reference symbols: 1-a valve plate adjusting shaft; 2-sealing the fixed stop block; 3-static pressure measuring tube; 4-full pressure measuring tube; 5-a rotating shaft; 6-a valve plate; 7-a piezometric tube valve plate; 9-valve body.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, an embodiment of the present invention provides an air volume variable valve with a wide air volume measurement range, including a valve body 9 and a pitot tube speed measurement device, a valve plate 6 in a parallelogram shape is disposed in the valve body 9, and a parallel opposite side of the valve plate 6 is a downstream side; the corners of the valve plate 6 are hinged through a rotating shaft 5, and the valve plate 6 swings in the plane of the valve plate through the rotating shaft 5; the static pressure measuring tube 3 of pitot tube speed sensor is by one of them the downstream side stretches out to outside the valve plate 6, just pitot tube speed sensor's total pressure measuring tube 4 is by another the downstream side stretches out to outside the valve plate 6. In the embodiment, the problem of the measurement accuracy of the wind speed under the condition of small air supply volume is solved; through adopting to set up pitot tube speed sensor on the valve plate 6 that moves, can carry out the translation and do not take place the change of direction according to the action of valve plate 6, pitot tube speed sensor can follow the position of valve and move promptly, can not cause the precision decline of the pipeline that tests the speed. Specifically, the downwind side is a downwind side, i.e., upper and lower sides of the parallelogram shown in fig. 1. The two sides have pressure-measuring tube valve plates 7. The pitot tube speed measuring device is a conventional device which comprises a static pressure measuring tube 3 and a full pressure measuring tube 4, is an instrument for calculating the flow speed by measuring the difference between the total pressure and the static pressure of a fluid, and the specific structure and the working principle of the pitot tube speed measuring device are not described in detail. The measurement problem of the wind speed in the small wind quantity can be solved by matching the pressure measuring device with the valve plate 6 of the swinging parallelogram and changing the position of a pressure measuring point according to the principle of a pitot tube. According to the pitot tube speed measuring device arranged on the valve plate 6, the flow is obtained according to the position of the valve plate 6 and the product of the speed and the area after the flow area is formed. The specific working principle is as follows:
(1) the principle of the wind speed measuring device is mainly based on the total pressure value and the static pressure value of the airflow measured by a Pitot tube according to the formula (1)
In the formula: v is the velocity of the air flow at the measuring point, m/s;
p1is the full pressure value, Pa, measured by the Pitot tube;
p2the hydrostatic value measured for the pitot tube, Pa;
ρ is the density of the gas, kg/m 3;
zeta is the correction coefficient of the shape and structure of the pitot tube.
(2) If the flow reducing valve required by the outside begins to be closed, the control precision of the system is influenced by overlarge wind speed measurement error of the pitot tube if the measuring device is not changed. The speed measuring pipe of the device acts according to the position of the valve, and the precision of the speed measuring pipe cannot be reduced.
The air volume measurement is calculated by the following formula (2)
Q＝2×v×(h-l×cosα)×w (2)
In the formula: q is the flow of the variable air volume device, m 3/s;
v is the velocity of the air flow at the measuring point, m/s;
h is the height of the variable air volume device, m;
l is the length of the valve plate 6, m;
alpha is the angle of the valve;
w is the width of the variable air volume device, m.
As an optimized solution of the embodiment of the present invention, please refer to fig. 1, a valve plate adjusting shaft 1 is disposed on another parallel opposite side of the valve plate 6. In the present embodiment, the oscillation of the valve plate 6 can be controlled by the valve plate adjusting shaft 1.
As an optimized solution of the embodiment of the present invention, please refer to fig. 1, four corners of the valve plate 6 are hinged by the rotating shaft 5. In the present embodiment, the swing is facilitated by the four-corner positioning.
As an optimized solution of the embodiment of the present invention, please refer to fig. 1, a sealing fixed stop 2 is disposed outside at least one of the downstream sides. In this embodiment, the sealing fixed stop blocks 2 can be arranged on the downstream side to perform the sealing function and the blocking function.
Referring to fig. 1, an embodiment of the present invention provides an air volume varying system, including the air volume varying valve with a wide air volume measuring range. In the embodiment, the variable air volume valve with the wide air volume measuring range is adopted, so that the problem of the measuring accuracy of the air speed under the condition of small air supply volume is solved; through adopting to set up pitot tube speed sensor on valve plate 6 that moves, can carry out the translation and the change of not taking place the direction according to the action of valve plate 6, pitot tube speed sensor can follow the position of valve and move promptly, can not cause the precision decline of the pipeline that tests the speed. Specifically, the downwind side is the downwind side, i.e., the upper and lower sides of the parallelogram shown in fig. 1. The pitot tube speed measuring device is a conventional device which comprises a static pressure measuring tube 3 and a full pressure measuring tube 4, is an instrument for calculating the flow speed by measuring the difference between the total pressure and the static pressure of a fluid, and the specific structure and the working principle of the pitot tube speed measuring device are not described in detail. The measurement problem of the wind speed in the small wind quantity can be solved by matching the pressure measuring device with the valve plate 6 of the swinging parallelogram and changing the position of a pressure measuring point according to the principle of a pitot tube. According to the pitot tube speed measuring device arranged on the valve plate 6, the flow is obtained according to the position of the valve plate 6 and the product of the speed and the area after the flow area is formed. The specific working principle is as follows:
(1) the principle of the wind speed measuring device is mainly based on the total pressure value and the static pressure value of the airflow measured by a Pitot tube according to the formula (1)
In the formula: v is the velocity of the air flow at the measuring point, m/s;
p1is the full pressure value, Pa, measured by the Pitot tube;
p2the hydrostatic value measured for the pitot tube, Pa;
ρ is the density of the gas, kg/m 3;
zeta is the correction coefficient of the shape and structure of the pitot tube.
(2) If the externally required flow reducing valve begins to close, the control precision of the system is affected by the overlarge wind speed measurement error of the pitot tube if the measuring device is not changed. The speed measuring pipe of the device acts according to the position of the valve, and the precision of the speed measuring pipe cannot be reduced.
The air volume measurement is calculated by the following formula (2)
Q＝2×v×(h-l×cosα)×w(2)
In the formula: q is the flow of the variable air volume device, m 3/s;
v is the velocity of the air flow at the measuring point, m/s;
h is the height of the variable air volume device, m;
l is the length of the valve plate 6, m;
alpha is the angle of the valve;
w is the width of the variable air volume device, m.
Referring to fig. 1 as an optimization scheme of the embodiment of the present invention, the system further includes a controller for controlling the swing of the valve plate 6 according to the set air volume. In this embodiment, the controller controls the position of the valve plate according to the set air volume, and the Pitot tube speed measurement device feeds back the feedback according to the measured air volume to realize the stable control in the small air volume. Preferably, an angle sensor is arranged in the controller, the air volume is measured by a calculator in the controller according to the existing wind speed measuring device and basic parameters of the valve, and then the opening of the air valve is further controlled according to the measured air volume to ensure that the air volume of the system is under the stable required air volume. In this embodiment, the control is prior art, and the angle sensor may sense the attitude to give feedback. The specific operation principle will not be described in detail here.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The utility model provides a wide variable air volume valve of amount of wind measurement range which characterized in that: the high-pressure-resistance high-pressure-resistance high-pressure pump comprises a valve body and a pitot tube speed-resistance high-pressure-resistance high-pressure-resistance high-pressure-resistance high-pressure-resistance high-pressure-resistance high-pressure resistance high-pressure resistance high-pressure resistance high-resistance high; the corner of the valve plate is hinged through a rotating shaft, and the valve plate swings in the plane of the valve plate through the rotating shaft; the static pressure measuring tube of the pitot tube speed measuring device is formed by one of the two downstream sides extending out of the valve plate, and the full pressure measuring tube of the pitot tube speed measuring device is formed by the other downstream side extending out of the valve plate.
2. The wide air volume variable valve of claim 1, characterized in that: and a valve plate adjusting shaft is arranged on the other parallel opposite side of the valve plate.
3. The wide air volume variable valve of claim 1, characterized in that: the four corners of the valve plate are hinged through the rotating shaft.
4. The wide air volume variable valve of claim 1, characterized in that: and a sealing fixed stop block is arranged outside at least one downstream side.
5. A variable air volume system is characterized in that: the air quantity variable valve with wide air quantity measuring range according to any one of claims 1 to 4 is included.
6. The variable air volume system according to claim 5, characterized in that: the valve plate is characterized by also comprising a controller used for controlling the swing of the valve plate according to the set air volume.
7. The variable air volume system according to claim 6, characterized in that: an angle sensor is arranged in the controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122318514.XU CN216742884U (en) | 2021-09-24 | 2021-09-24 | Air volume variable valve with wide air volume measurement range and air volume variable system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122318514.XU CN216742884U (en) | 2021-09-24 | 2021-09-24 | Air volume variable valve with wide air volume measurement range and air volume variable system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216742884U true CN216742884U (en) | 2022-06-14 |
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ID=81907443
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122318514.XU Active CN216742884U (en) | 2021-09-24 | 2021-09-24 | Air volume variable valve with wide air volume measurement range and air volume variable system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216742884U (en) |
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2021
- 2021-09-24 CN CN202122318514.XU patent/CN216742884U/en active Active
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