CN217043924U - Variable air volume control system of fume hood - Google Patents
Variable air volume control system of fume hood Download PDFInfo
- Publication number
- CN217043924U CN217043924U CN202220714714.9U CN202220714714U CN217043924U CN 217043924 U CN217043924 U CN 217043924U CN 202220714714 U CN202220714714 U CN 202220714714U CN 217043924 U CN217043924 U CN 217043924U
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- CN
- China
- Prior art keywords
- fume hood
- air volume
- butterfly valve
- variable air
- sensor
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- Expired - Fee Related
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- 239000003517 fume Substances 0.000 title claims abstract description 66
- 238000006073 displacement reaction Methods 0.000 claims abstract description 13
- 238000007789 sealing Methods 0.000 claims description 9
- 238000009423 ventilation Methods 0.000 claims description 6
- 230000000875 corresponding effect Effects 0.000 claims description 4
- 238000004134 energy conservation Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 3
- 231100000614 poison Toxicity 0.000 description 2
- 230000007096 poisonous effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
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- Devices For Use In Laboratory Experiments (AREA)
Abstract
The utility model provides a fume chamber variable air volume control system, which comprises a control panel fixed on a fume chamber upright post, a control body arranged at the top of the fume chamber, a variable air volume butterfly valve communicated with a pipeline, an air velocity transducer arranged inside the butterfly valve, a displacement sensor, a region sensor and a temperature sensor, wherein all parts are electrically connected; when the fume hood is used for an experiment, the wind speed inside the butterfly valve is measured in real time through the wind speed sensor installed inside the butterfly valve, according to calculation, the real-time air quantity of the fume hood is obtained, the real-time position data of the displacement sensor is read through the controller, the real-time surface wind speed value of the fume hood can be accurately obtained, compared with the point-surface wind speed measured inside the fume hood, the obtained surface wind speed precision is greatly improved, the whole control system is stable and reliable, and the requirements of safety and energy conservation are met.
Description
Technical Field
The utility model belongs to the technical field of laboratory paraphernalia technique and specifically relates to a fume chamber variable air volume control system.
Background
The fume hood is a device widely used in laboratories at present, as long as poisonous and harmful gas generated in the fume hood is exhausted outdoors through an exhaust fan, so that the safety of workers in the laboratories is protected, the safety surface wind speed of the fume hood is limited to 0.3-0.5m/s in the industry at present, and the poisonous and harmful gas in the fume hood is ensured not to leak indoors through a method for measuring the surface wind speed of the fume hood, however, the surface wind speed is usually measured by a method for installing a surface wind speed sensor on the side wall of the fume hood by adopting equipment with variable wind speed control in China, and then a pipeline valve body is controlled through other control components, so that the exhaust volume of the fume hood is controlled, but the measured surface wind speed value is only point surface wind speed and cannot completely represent the whole surface wind speed of the fume hood, and the instability of airflow is caused by the operation of laboratory personnel in the fume hood, the measured data of a single point location fluctuates frequently all the time, and finally the whole system is unstable, so that the risk of toxic and harmful gas leakage is generated.
Disclosure of Invention
In order to solve the problem, the utility model provides a fume chamber variable air volume control system, its aim at solves present fume chamber variable air volume equipment face wind speed and measures unstably, and then the unstable problem of control system.
In order to achieve the above object, the utility model provides a pair of fume chamber variable air volume control system is realized like this: contain the control panel who fixes on the fume chamber stand, install the control body at the fume chamber top, with the variable air volume butterfly valve of pipeline intercommunication, install in the inside air velocity transducer of variable air volume butterfly valve, displacement sensor, area sensor and temperature sensor, each part device passes through electric connection.
The control panel is installed on the side upright post of the fume chamber in an embedded mode.
The control body is arranged at the top of the fume hood in a guide rail type of 35 mm.
The variable air volume butterfly valve is composed of an electric actuator and a sealing valve body, the lower end of the variable air volume butterfly valve is connected with an air outlet of a ventilation cabinet, the upper end of the variable air volume butterfly valve is in butt joint with an exhaust pipeline, and an air speed sensor is installed inside the variable air volume butterfly valve.
And the displacement sensor is arranged at the top end of the fume hood and is connected with the window of the fume hood through a pull rope.
And the area sensor is arranged at the front end of the fume hood.
And the temperature sensor is arranged in the inner cavity of the fume hood.
Because the utility model discloses an above-mentioned electric connection's structure to can obtain following beneficial effect: when the fume hood is used for an experiment, the wind speed inside the butterfly valve is measured in real time through the wind speed sensor installed inside the butterfly valve, according to calculation, the real-time air quantity of the fume hood is obtained, the real-time position data of the displacement sensor is read through the controller, the real-time surface wind speed value of the fume hood can be accurately obtained, compared with the point-surface wind speed measured inside the fume hood, the obtained surface wind speed precision is greatly improved, the whole control system is stable and reliable, and the requirements of safety and energy conservation are met.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of the variable air volume control system of the ventilation cabinet of the utility model.
As an illustration of the drawings,
1. the control panel, 2, the control body, 3, the variable air volume butterfly valve, 4, the air speed sensor, 5, the displacement sensor, 6, the area sensor, 7, the temperature sensor, 8, the fume hood window, 9, the fume hood air outlet, 10, the exhaust pipeline and 11, the fume hood side column.
Detailed Description
As shown in fig. 1, the preferred embodiment of the present invention is: the wind speed control device comprises a control panel 1, a control body 2, a variable air volume butterfly valve 3, a wind speed sensor 4, a displacement sensor 5, an area sensor 6 and a temperature sensor 7; the control panel 1 and the side upright post 11 of the fume hood are installed in an embedded manner and are electrically connected with the control body 2; one end of the variable air volume butterfly valve 3 is connected with an air outlet 9 of the fume hood, and the other end is connected with an air exhaust pipeline 10 and is electrically connected with the control body 2; the wind speed sensor 4 is arranged at the lower position inside the variable air volume butterfly valve 3, is fixed by screws through a sealing pad, ensures sealing, and is electrically connected with the control body 2; the displacement sensor 5 is arranged at the top of the fume hood, is connected with a pull rope of a fume hood window 8 and is electrically connected with the control body 2; the area sensor is arranged at the front end of the top of the fume hood, detects whether personnel exist or not by using a dry mode, and is electrically connected with the control body 2; the temperature sensor 7 is arranged inside the fume hood, fixed by screws and electrically connected with the control body 2; detect real-time amount of wind value and the wind speed value of kneading dough through wind speed sensor 4 and 5 dual sensors of displacement sensor, control variable air volume butterfly valve 3 corresponding action, whether exist through 6 testing personnel of area sensor, reach the requirement of energy-conservation, detect the inside temperature of fume chamber through temperature sensor 7, reach the requirement of safety ring guarantor.
As shown in fig. 1, another preferred embodiment of the present invention is: the control panel 1 and a side upright post 11 of the fume hood are installed in an embedded manner and are electrically connected with the control body 2; one end of the variable air volume butterfly valve 3 is connected with an air outlet 9 of the fume hood, and the other end is connected with an air exhaust pipeline 10 and is electrically connected with the control body 2; the wind speed sensor 4 is arranged at the lower position inside the variable air volume butterfly valve 3, is fixed by screws through a sealing pad, ensures sealing, and is electrically connected with the control body 2; the real-time air speed of an air outlet 9 of the fume hood is detected through an air speed sensor 4, the real-time air quantity value of a pipeline is calculated, a variable air quantity butterfly valve 3 is controlled to open a corresponding angle, and the real-time air speed value of the fume hood is calculated according to the comparison of the angle opening ratio of the butterfly valve and the preset air speed.
The utility model discloses a theory of operation and working process as follows:
when the fume hood is used, firstly, the specific position of a fume hood window 8 is measured through a displacement sensor 5, the real-time air quantity value required by the fume hood at present is obtained through calculation in a control body 2, then, a variable air quantity butterfly valve 3 is controlled to be quickly opened to a corresponding angle, after the variable air quantity butterfly valve 3 is opened in place, a wind speed sensor 4 measures the real-time wind speed of a fume hood exhaust outlet 9 in real time, the real-time exhaust air quantity of the fume hood is obtained, the real-time exhaust air quantity of the fume hood is compared with the required exhaust air quantity of the fume hood, the variable air quantity butterfly valve 3 is finely adjusted, the real-time surface wind speed value is displayed according to the opening height of the fume hood window 8 and the real-time air quantity value, a region sensor 6 can sense the existence of a person, when the person exists, the standard surface wind speed is adjusted to be 0.5m/s, when the person leaves, the surface wind speed is adjusted to be 0.3m/s, the purpose of energy saving is achieved, and the temperature sensor 7 can measure the internal temperature of the fume hood in real time, when the surface wind speed exceeds the limit, the window exceeds the limit and the temperature exceeds the limit, the control panel 1 can realize the acousto-optic alarm function.
Claims (5)
1. A variable air volume control system of a fume hood comprises a control panel (1), a control body (2), a variable air volume butterfly valve (3), an air velocity sensor (4), a displacement sensor (5), an area sensor (6) and a temperature sensor (7), and is characterized in that the control panel (1) and a side upright post (11) of the fume hood are installed in an embedded mode and are electrically connected with the control body (2); one end of the variable air volume butterfly valve (3) is connected with an air outlet (9) of the fume hood, and the other end of the variable air volume butterfly valve is connected with an air exhaust pipeline (10) and is electrically connected with the control body (2); the air speed sensor (4) is arranged at a lower position in the variable air volume butterfly valve (3), is fixed with a screw through a sealing gasket to ensure sealing, and is electrically connected with the control body (2); the displacement sensor (5) is arranged at the top of the fume hood, is connected with a pull rope of a fume hood window (8) and is electrically connected with the control body (2); the area sensor (6) is arranged at the front end of the top of the fume hood, is used for detecting whether personnel exist, and is electrically connected with the control body (2); the temperature sensor (7) is arranged inside the ventilation cabinet, fixed by screws and electrically connected with the control body (2); real-time air volume value and surface air speed value are detected through a wind speed sensor (4) and a displacement sensor (5), corresponding actions of a butterfly valve are controlled, whether personnel exist is detected through an area sensor (6), and the internal temperature of the ventilation cabinet is detected through a temperature sensor (7).
2. The variable air volume control system of the fume hood according to claim 1, wherein the air velocity sensor (4) is installed inside the variable air volume butterfly valve (3) and is directly communicated with the fume hood exhaust outlet (9) and the exhaust duct (10) through the opening of the variable air volume butterfly valve (3).
3. The ventilation hood variable air volume control system according to claim 1, wherein the air velocity sensor (4) installed inside the variable air volume butterfly valve (3) is fixed through a sealing gasket and a nut to prevent air leakage.
4. The variable air volume control system of the fume hood according to claim 1, characterized in that the control panel (1) and the control body (2) are both provided with pluggable terminals.
5. The variable air volume control system of the fume hood according to claim 1, characterized in that a sealing ring disc is adopted in the variable air volume butterfly valve (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220714714.9U CN217043924U (en) | 2022-03-30 | 2022-03-30 | Variable air volume control system of fume hood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220714714.9U CN217043924U (en) | 2022-03-30 | 2022-03-30 | Variable air volume control system of fume hood |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217043924U true CN217043924U (en) | 2022-07-26 |
Family
ID=82466006
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220714714.9U Expired - Fee Related CN217043924U (en) | 2022-03-30 | 2022-03-30 | Variable air volume control system of fume hood |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217043924U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115971194A (en) * | 2022-12-29 | 2023-04-18 | 广州驰拓智能科技有限公司 | Variable air volume control method and device for fume hood |
-
2022
- 2022-03-30 CN CN202220714714.9U patent/CN217043924U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115971194A (en) * | 2022-12-29 | 2023-04-18 | 广州驰拓智能科技有限公司 | Variable air volume control method and device for fume hood |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20220726 |