CN212916955U - Novel fume chamber VAV control device - Google Patents
Novel fume chamber VAV control device Download PDFInfo
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- CN212916955U CN212916955U CN202021397726.0U CN202021397726U CN212916955U CN 212916955 U CN212916955 U CN 212916955U CN 202021397726 U CN202021397726 U CN 202021397726U CN 212916955 U CN212916955 U CN 212916955U
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- fume chamber
- fume hood
- sensor
- negative pressure
- circuit board
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Abstract
The utility model relates to an experimental facilities technical field just discloses a novel fume chamber VAV control device, including the fume chamber cabinet body, the blast gate is installed at the top of the fume chamber cabinet body, the mounting panel has the blast gate executor in the blast gate, the internal PLC special control circuit board of installing of fume chamber cabinet, install a plurality of individual body sensors and high accuracy pressure differential sensor on the fume chamber cabinet body, body sensor is located under the high accuracy pressure differential sensor, is located body sensor is located install the display touch screen on the fume chamber cabinet body between the high accuracy pressure differential sensor. The utility model discloses a negative pressure value in the high accuracy pressure differential sensor detection fume chamber cabinet keeps the fume chamber cabinet in the negative pressure invariable through the blast gate regulation, harmful gas just can not be excessive in the fume chamber like this, satisfies fume chamber face wind speed through adjusting the negative pressure value and somebody 'S time is 0.5m/S, 0.3 m/S' S safety standard requirement when unmanned.
Description
Technical Field
The utility model relates to an experimental facilities technical field especially relates to a novel fume chamber VAV control device.
Background
At present, two types of known VAV variable air volume control of a fume hood are provided, one type is to adopt a special surface air velocity sensor of the fume hood to measure the surface air velocity of the fume hood in real time (when no person exists in a detection area, a typical set value is 0.3m/s, and when a person exists in the detection area, the set value is 0.5 m/s); controlling the opening of the valve by taking the air speed of the surface of the ventilating cabinet as a constant value to ensure that the opening is constant within a safe airflow value range; and the other method is to calculate the air exhaust quantity value required by the current fume hood according to the measured value of the door height sensor and the set surface air speed value, so as to control the air quantity of the variable air quantity valve to meet the requirement of the air exhaust quantity of the fume hood.
The two VAV variable air volume controls are respectively characterized in that:
the first VAV variable air volume control method is characterized in that a surface air speed sensor is used as a control signal for collection, the surface air speed sensor is used as a core element, and the surface air speed sensor collects data in a point-to-surface manner, is greatly influenced by the environment and is not accurate enough;
the second kind of VAV variable air volume differential pressure flow control has the key elements including differential pressure type butterfly valve, differential pressure sensor and window door height sensor. The window height sensor is a key device and is used for measuring the door opening height and calculating the air inlet area.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the problem that current fume chamber VAV controlling means appears in the use among the prior art, and the novel fume chamber VAV controlling means who provides.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a novel fume chamber VAV control device, includes the fume chamber cabinet body, the blast gate is installed at the top of the fume chamber cabinet body, the mounting panel has the blast gate executor in the blast gate, the internal PLC special control circuit board of installing of fume chamber cabinet, install a plurality of individual body sensors and high accuracy pressure differential sensor on the fume chamber cabinet body, body sensor is located high accuracy pressure differential sensor under, is located body sensor is located install the display touch-sensitive screen on the fume chamber cabinet body between the high accuracy pressure differential sensor, and body sensor and high accuracy pressure differential sensor's output all integrates to PLC special control circuit board, the input electric property of blast gate executor and PLC special control circuit board's output electric connection, the output electric connection PLC special control circuit board's of display touch-sensitive screen input, blast gate executor, The input ends of the human body sensor, the high-precision micro differential pressure sensor, the display touch screen and the PLC special control circuit board are electrically connected with an external power supply.
Preferably, a ventilation duct is installed at the bottom of one side, close to the cabinet body of the fume hood.
Preferably, the four corners of the bottom of the fume hood body are provided with universal wheels with locks.
Preferably, a plurality of electric sockets are arranged on the ventilation cabinet body under the human body sensor.
Preferably, the top of the air valve is fixedly connected with a filter screen.
Preferably, the fume chamber body and the air valve are both coated with antirust paint.
Compared with the prior art, the utility model provides a novel fume chamber VAV control device possesses following beneficial effect:
this novel fume chamber VAV controlling means adopts communication mode to read the pressure differential change of SDP810-125pa through setting up blast gate, blast gate executor, human body sensor, high accuracy pressure differential micro-sensor, demonstration touch-sensitive screen and ventilation pipe, gives a standard pressure differential value 0.4pa (can set for), through PLC program regulation control blast gate aperture, keeps the interior negative pressure of fume chamber cabinet invariable. When the negative pressure of the air cabinet is greater than the set pressure difference, the opening of the valve plate of the air valve is automatically adjusted through the electric actuator, the opening of the valve is reduced, and the negative pressure of the air cabinet is reduced along with the reduction of the opening of the valve, so that the negative pressure approaches a required negative pressure value; otherwise, when the negative pressure of the air cabinet is smaller than the corresponding pressure difference, the opening of the air valve is automatically adjusted, the opening of the valve is increased, and the negative pressure of the air cabinet is increased along with the opening of the air valve and approaches to the required negative pressure value. By the mode, the negative pressure in the fume hood can be kept constant, harmful gas in the fume hood does not overflow to meet the safety requirement, and meanwhile, excessive air exhaust is not carried out to achieve the purpose of energy conservation
The part that does not relate to among the device all is the same with prior art or can adopt prior art to realize, the utility model discloses a high accuracy pressure differential micro sensor detects the interior negative pressure value of fume chamber cabinet, adjusts through the blast gate and keeps the interior negative pressure of fume chamber cabinet invariable, just can not be excessive like this harmful gas in the fume chamber, satisfies fume chamber face wind speed through adjusting the negative pressure value and someone is 0.5m/S, 0.3 m/S' S safety standard requirement when unmanned.
Drawings
Fig. 1 is a schematic front view of a novel VAV control device of a fume chamber provided by the present invention;
fig. 2 is the utility model provides a novel fume chamber VAV control device's side view schematic diagram.
In the figure: the air conditioner comprises a ventilation cabinet body 1, an air valve 2, an air valve actuator 3, a human body sensor 4, a high-precision micro differential pressure sensor 5, a display touch screen 6, a ventilation guide pipe 7, universal wheels 8, an electrical socket 9 and a filter screen 10.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.
Referring to fig. 1-2, a novel fume chamber VAV control device, including the fume chamber cabinet body 1, the blast gate 2 is installed at the top of the fume chamber cabinet body 1, the mounting panel has blast gate executor 3 in the blast gate 2, install the special control circuit board of PLC (not shown in the figure) in the fume chamber cabinet body 1, install a plurality of human body sensor 4 and high accuracy differential pressure sensor 5 on the fume chamber cabinet body 1, high accuracy differential pressure sensor 5 is SDP810-125Pa differential pressure sensor, this sensor has outstanding precision and repeatability under being less than 1 Pa. The special high-precision micro differential pressure sensor is manufactured by using the special high-precision micro differential pressure sensor, the range is set to be 0-2pa through a PLC program, the human body sensor 4 is positioned under the high-precision micro differential pressure sensor 5, the display touch screen 6 is arranged on the fume hood body 1 positioned between the human body sensor 4 and the high-precision micro differential pressure sensor 5, the output ends of the human body sensor 4 and the high-precision micro differential pressure sensor 5 are integrated on a PLC special control circuit board, the input end of the air valve actuator 3 is electrically connected with the output end of the PLC special control circuit board, the output end of the display touch screen 6 is electrically connected with the input end of the PLC special control circuit board, the air valve actuator 3, the human body sensor 4, the high-precision micro differential pressure sensor 5, the display touch screen 6 and the input end of the PLC special control circuit board are electrically connected with an external power supply, and (3) giving a standard pressure difference value of 0.4pa (which can be set), adjusting and controlling the opening of the air valve through a PLC program, and keeping the negative pressure in the fume hood constant. When the negative pressure of the air cabinet is greater than the set pressure difference, the opening of the valve plate of the air valve is automatically adjusted through the electric actuator, the opening of the valve is reduced, and the negative pressure of the air cabinet is reduced along with the reduction of the opening of the valve, so that the negative pressure approaches a required negative pressure value; otherwise, when the negative pressure of the air cabinet is smaller than the corresponding pressure difference, the opening of the air valve is automatically adjusted, the opening of the valve is increased, and the negative pressure of the air cabinet is increased along with the opening of the air valve and approaches to the required negative pressure value. By the mode, the negative pressure in the fume hood can be kept constant, harmful gas in the fume hood does not overflow to meet the safety requirement, and meanwhile, excessive air exhaust is avoided to achieve the purpose of energy conservation.
The ventilation duct 7 is installed to the bottom that the fume chamber cabinet body 1 is close to one side, is convenient for measure the inside condition of the fume chamber cabinet body 1.
The universal wheel 8 of area lock is all installed to the bottom four corners department of the fume chamber cabinet body 1, the removal of the fume chamber cabinet body 1 of being convenient for.
Be located and install a plurality of electrical socket 9 on the ventilation cabinet body 1 under human body sensor 4, convenient to use power.
The top fixedly connected with filter screen 10 of blast gate 2 prevents that impurity from getting into in blast gate 2.
All scribble the anti-rust paint on the fume chamber cabinet body 1 and the blast gate 2, prevent that the rusty condition of the fume chamber cabinet body 1 and blast gate 2 from taking place.
The utility model discloses in, adopt communication mode to read the pressure differential change of SDP810-125pa, give a standard differential pressure value 0.4pa (can set for), through PLC program regulation control blast gate aperture, keep the interior negative pressure of fume chamber invariable. When the negative pressure of the air cabinet is greater than the set pressure difference, the opening of the valve plate of the air valve is automatically adjusted through the electric actuator, the opening of the valve is reduced, and the negative pressure of the air cabinet is reduced along with the reduction of the opening of the valve, so that the negative pressure approaches a required negative pressure value; otherwise, when the negative pressure of the air cabinet is smaller than the corresponding pressure difference, the opening of the air valve is automatically adjusted, the opening of the valve is increased, and the negative pressure of the air cabinet is increased along with the opening of the air valve and approaches to the required negative pressure value. By the mode, the negative pressure in the fume hood can be kept constant, harmful gas in the fume hood does not overflow to meet the safety requirement, and meanwhile, excessive air exhaust is avoided to achieve the purpose of energy conservation.
The product has excellent use effect in a laboratory ventilation room, and is measured by experiments:
table one:
the inside and outside pressure difference (pa) of the lower cabinet at different window heights when the ventilation cabinet meets the requirement that the wind speed is 0.3m/s
Remarking:
1: in the opening process of the cabinet door, the cabinet door is lifted, the air leakage area of the upper gap is gradually reduced, and the air leakage amount of the air cabinet is gradually reduced.
2: the air discharge measured by the above table is measured by a testo420 air volume cover, and is accurately measured between 80 and 3500m 3/h.
3: the differential pressure (Pa) inside and outside the cabinet is accurately measured by a differential pressure sensor SDP810-125Pa, and the sensor has excellent precision and repeatability under the pressure lower than 1 Pa.
4: because the wind pressure has relative instability, the measured pressure difference slightly fluctuates in a small range, and the middle relative stability value is taken as the numerical value in the table.
5: in the above table, it can be clearly seen that when the surface wind speed is 0.5m/s, the internal and external differential pressure values of the cabinet are basically stabilized at about 0.13 Pa.
Table two:
the inside and outside pressure difference (pa) of the lower cabinet at different window heights when the ventilation cabinet meets the requirement that the wind speed is 0.5m/s
Remarking:
1: in the opening process of the cabinet door, the cabinet door is lifted, the air leakage area of the upper gap is gradually reduced, and the air leakage amount of the air cabinet is gradually reduced.
2: the air discharge measured by the above table is measured by a testo420 air volume cover, and is accurately measured between 80 and 3500m 3/h.
3: the differential pressure (Pa) inside and outside the cabinet is accurately measured by a differential pressure sensor SDP810-125Pa, and the sensor has excellent precision and repeatability under the pressure lower than 1 Pa.
4: because the wind pressure has relative instability, the measured pressure difference slightly fluctuates in a small range, and the middle relative stability value is taken as the numerical value in the table.
5: in the above table, it can be clearly seen that when the surface wind speed is 0.3m/s, the internal and external differential pressure values of the cabinet are basically stabilized at about 0.34 Pa.
The utility model discloses a negative pressure value in the high accuracy pressure differential sensor detection fume chamber cabinet keeps the fume chamber cabinet in the negative pressure invariable through the blast gate regulation, harmful gas just can not be excessive in the fume chamber like this, satisfies fume chamber face wind speed through adjusting the negative pressure value and somebody 'S time is 0.5m/S, 0.3 m/S' S safety standard requirement when unmanned.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (6)
1. A novel VAV control device of a fume hood comprises a fume hood body (1) and is characterized in that an air valve (2) is installed at the top of the fume hood body (1), an air valve actuator (3) is installed in the air valve (2), a PLC (programmable logic controller) special control circuit board is installed in the fume hood body (1), a plurality of human body sensors (4) and high-precision micro differential pressure sensors (5) are installed on the fume hood body (1), the human body sensors (4) are located under the high-precision micro differential pressure sensors (5), a display touch screen (6) is installed on the fume hood body (1) between the human body sensors (4) and the high-precision micro differential pressure sensors (5), the output ends of the human body sensors (4) and the high-precision micro differential pressure sensors (5) are integrated on the PLC special control circuit board, and the input end of the air valve actuator (3) is electrically connected with the output end of the PLC special control circuit board, the output end of the display touch screen (6) is electrically connected with the input end of the PLC special control circuit board, and the input ends of the air valve actuator (3), the human body sensor (4), the high-precision micro differential pressure sensor (5), the display touch screen (6) and the PLC special control circuit board are electrically connected with an external power supply.
2. A new fume hood VAV control device according to claim 1, characterized in that the bottom of the fume hood body (1) near one side is fitted with a ventilation duct (7).
3. A novel fume hood VAV control device according to claim 1, characterized in that universal wheels (8) with locks are installed at the four corners of the bottom of the fume hood body (1).
4. A new VAV control for a fumehood according to claim 1 wherein a number of electrical sockets (9) are mounted on the fumehood body (1) directly below the body sensor (4).
5. A new VAV control for a fumehood according to claim 1 wherein a screen (10) is fixedly attached to the top of the damper (2).
6. A novel fume hood VAV control device according to claim 1, characterized in that the fume hood body (1) and the air valve (2) are coated with antirust paint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021397726.0U CN212916955U (en) | 2020-07-16 | 2020-07-16 | Novel fume chamber VAV control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021397726.0U CN212916955U (en) | 2020-07-16 | 2020-07-16 | Novel fume chamber VAV control device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212916955U true CN212916955U (en) | 2021-04-09 |
Family
ID=75332042
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021397726.0U Expired - Fee Related CN212916955U (en) | 2020-07-16 | 2020-07-16 | Novel fume chamber VAV control device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212916955U (en) |
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2020
- 2020-07-16 CN CN202021397726.0U patent/CN212916955U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
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| 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: 20210409 |