CN211191353U - Air exhaust control mechanism for air supplement of ventilation cabinet - Google Patents
Air exhaust control mechanism for air supplement of ventilation cabinet Download PDFInfo
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- CN211191353U CN211191353U CN201922243006.2U CN201922243006U CN211191353U CN 211191353 U CN211191353 U CN 211191353U CN 201922243006 U CN201922243006 U CN 201922243006U CN 211191353 U CN211191353 U CN 211191353U
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Abstract
The utility model discloses an exhaust control mechanism for the air supply of a ventilation cabinet, which comprises a ventilation cabinet, an exhaust variable air valve, an air supply variable air valve and a variable air valve controller, wherein the upper surface of the ventilation cabinet is connected with the exhaust variable air valve and the air supply variable air valve, the variable air valve controller is respectively connected with the ventilation cabinet, the exhaust variable air valve and the air supply variable air valve, the exhaust variable air valve is arranged in an exhaust duct, the bottom of the exhaust duct is connected with an exhaust outlet on the upper surface of the ventilation cabinet, the air supply variable air valve is arranged in the exhaust duct, the bottom of the exhaust duct is connected with an air supply outlet on the upper surface of the ventilation cabinet, the opening height of the ventilation cabinet is calculated according to the signal acquisition of a displacement sensor, different opening positions are adopted, the air supply is increased while the air supply is increased according to the opening degree of the proportional control air supply valve, the automatic control of the air supply is realized, the outdoor fresh air is supplied, the energy-saving purpose is achieved, the structure is reasonable, the construction is simple, and the practicability is strong.
Description
Technical Field
The utility model relates to a mend wind, exhaust equipment technical field, specifically be an exhaust control mechanism for fume chamber mends wind.
Background
All buildings require a control system for proper operation to ensure comfort, safety and energy efficiency of operation. Especially in the laboratory, complex air conditioning systems and hazardous contaminants should be kept away from the operators to ensure their health and safety. However, the physical system is designed for maximum load and the control system must ensure that the temperature, humidity, wind speed, air mass flow and pressure of the air are maintained at appropriate values. So that it can be used in partial load situations. The safety of personnel and the accuracy of the experiment are ensured. Furthermore, laboratory air conditioning systems are often subject to rapid disturbances and changes, such as opening doors, opening smoke hoods, or laboratory items that generate significant amounts of heat. This requires a fast response of the control system to maintain accurate experimental conditions. In addition, the materials used in the laboratory are often hazardous, corrosive, or flammable, and therefore the components of the control system should have explosion and flame resistant properties. The laboratory exhaust system is generally ventilated for the laboratory as a whole, and the exhaust equipment such as an exhaust cabinet is only responsible for exhausting a certain part in the laboratory. The general laboratory exhaust system is provided with two purposes: ventilation, on the one hand, removes gases and contaminants from the room that are not captured by the exhaust equipment, and on the other hand, provides high quality air for eliminating the cold load in the room, rather than exhausting air to dominate the design of the laboratory system.
Typical laboratory exhaust systems are typically controlled with manual dampers. However, sometimes the materials processed in one room are incompatible with those in other rooms, requiring a separate exhaust fan. According to the specific control strategy of a room, a general laboratory exhaust system can be either constant air volume or variable air volume.
Since the existing laboratory generally uses 100% of outdoor air and the air conditioning system consumes a lot of energy before supplying air to each room, an improved technology is needed to solve the problem in the prior art.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an exhaust control mechanism for fume chamber mends wind, through set up a overhead door on the fume chamber, calculate the fume chamber height of opening the door according to displacement sensor signal acquisition, the difference position of opening the door, increase the volume of airing exhaust and increase the volume of supplementing the wind valve aperture according to proportional control simultaneously, realize the automatic control amount of wind, the utility model discloses an mend outdoor new trend in the cabinet, reduce the indoor air conditioner cold and hot volume of airing exhaust in the room, reach energy-conserving purpose, mainly by the fume chamber, variable air volume valve controller, air exhaust variable air volume valve and air supply variable air volume valve constitute, rational in infrastructure, the construction is simple, has stronger practicality to solve the problem that proposes in the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme: an exhaust control mechanism for supplementing air to a fume hood comprises the fume hood, an exhaust variable air volume valve, an air supply variable air volume valve and a variable air volume valve controller, wherein the upper surface of the fume hood is connected with the exhaust variable air volume valve and the air supply variable air volume valve;
the air conditioner comprises a ventilation cabinet, wherein an air cavity is arranged inside the upper end of the ventilation cabinet, an opening is formed in the middle position of the surface of the ventilation cabinet, a lifting door is arranged between upright posts on two sides of the ventilation cabinet, a driving motor is arranged at the bottom of the ventilation cabinet and is linked with the lifting door through a chain, the lifting door is movably arranged at the opening on the surface of the ventilation cabinet, an air supply opening and an air exhaust opening are formed in the upper end of the ventilation cabinet, the air supply opening and the air exhaust opening are both communicated with the air cavity of the ventilation cabinet, a displacement sensor is arranged at the position of the lifting door of the ventilation cabinet, a liquid crystal panel is further arranged on any upright post of the ventilation cabinet, and the ventilation cabinet is connected with an air;
the air exhaust variable air volume valve is arranged in an air exhaust pipeline, and the bottom of the air exhaust pipeline is connected with an air outlet on the upper surface of the ventilation cabinet;
the air supply variable air volume valve is arranged in an air supply pipeline, and the bottom of the air supply pipeline is connected with an air supply outlet on the upper surface of the ventilation cabinet;
and the variable air volume valve controller is a mcu single chip microcomputer controller.
Preferably, the utility model provides a pair of an exhaust control mechanism for fume chamber mends wind, wherein, the fume chamber lower extreme is provided with the base, the base surface of fume chamber lower extreme is provided with the cabinet door, driving motor sets up in the base, the slide has all been opened to the stand inboard of fume chamber both sides, the stand top is provided with the supporting wheel, driving motor links to each other with the chain bottom, the chain top links to each other with the supporting wheel.
Preferably, the utility model provides a pair of an exhaust control mechanism for fume chamber mends wind, wherein, the overhead door both sides are provided with the connecting rod respectively, the connecting rod sets up in the chute way of fume chamber both sides stand, the overhead door both sides are passed through the connecting rod and are linked to each other with the chain.
Preferably, the utility model provides a pair of an exhaust control mechanism for fume chamber mends wind, wherein, the uncovered height that fume chamber surface intermediate position opened is not more than the height of overhead door.
Preferably, the utility model provides a pair of an exhaust control mechanism for fume chamber mends wind, wherein, exhaust duct keeps away from a fume chamber termination exhaust fan.
Preferably, the utility model provides a pair of an exhaust control mechanism for fume chamber mends wind, wherein, blast pipe keeps away from a fume chamber termination air conditioner fresh air unit.
Preferably, the utility model provides a pair of an exhaust control mechanism for fume chamber mends wind, wherein, driving motor is servo synchronous gear motor.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) through setting up a overhead door on the fume hood, according to displacement sensor signal acquisition calculation fume hood height of opening the door, the difference position of opening the door increases the volume of airing exhaust and increases the volume of supplementing the wind according to proportional control air supplement valve aperture simultaneously, realizes the automatic control amount of wind.
(2) The outdoor fresh air is supplemented in the cabinet, so that the cold and hot air exhaust volume of the indoor air conditioner of a room is reduced, and the aim of energy conservation is fulfilled.
(3) The air-conditioning system mainly comprises a ventilation cabinet, an air-variable valve controller, an air-exhaust air-variable valve and an air-supply air-variable valve, and has the advantages of reasonable structure, simple construction and stronger practicability.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic top view of a fume hood.
Wherein: the air conditioner comprises a ventilation cabinet 1, an exhaust variable air volume valve 2, an air supply variable air volume valve 3, an air volume variable valve controller 4, a vertical column 5, a lifting door 6, a driving motor 7, a chain 8, an air supply outlet 9, an air outlet 10, a displacement sensor 11, a liquid crystal panel 12, an air exhaust pipeline 13, an air supply pipeline 14, a base 15, a supporting wheel 16 and a connecting rod 17.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the embodiments of the present invention and the accompanying drawings, and obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, the present invention provides a technical solution: an exhaust control mechanism for supplementing air to a fume hood comprises a fume hood 1, an exhaust variable air volume valve 2, an air supply variable air volume valve 3 and a variable air volume valve controller 4, wherein the upper surface of the fume hood 1 is connected with the exhaust variable air volume valve 2 and the air supply variable air volume valve 3, and the variable air volume valve controller 4 is respectively connected with the fume hood 1, the exhaust variable air volume valve 2 and the air supply variable air volume valve 3; a ventilation cabinet 1, wherein an air cavity is arranged in the upper end of the ventilation cabinet 1, an opening is arranged at the middle position of the surface of the ventilation cabinet 1, a lifting door 6 is arranged between upright posts 5 at two sides of the ventilation cabinet 1, the height of the opening arranged at the middle position of the surface of the ventilation cabinet 1 is not more than the height of the lifting door 6, a base 15 is arranged at the lower end of the ventilation cabinet 1, a cabinet door is arranged on the surface of the base 15 at the lower end of the ventilation cabinet 1, a driving motor 7 is arranged in the base 15, the driving motor 7 is a servo synchronous speed reducing motor, slideways are arranged at the inner sides of the upright posts 5 at two sides of the ventilation cabinet 1, a supporting wheel 16 is arranged at the top end of the upright post 5, the driving motor 7 is connected with the bottom end of a chain 8, the top end of the chain 8 is connected with the supporting wheel 16, the driving motor 7 is linked with the lifting door 6 through a, the lifting door 6 is movably arranged at an opening on the surface of the fume hood 1, the upper end of the fume hood 1 is provided with an air supply outlet 9 and an air exhaust outlet 10, the air supply outlet 9 and the air exhaust outlet 10 are both communicated with an air cavity of the fume hood 1, the fume hood 1 is provided with a displacement sensor 11 at the position of the lifting door 6, a liquid crystal panel 12 is further arranged on any upright post 5 of the fume hood 1, and the fume hood 1 is connected with the variable air volume valve controller 4 through the liquid crystal panel 12; the air exhaust variable air volume valve 2 is arranged in an air exhaust pipeline 13, the bottom of the air exhaust pipeline 13 is connected with an air outlet 10 on the upper surface of the fume hood 1, and one end of the air exhaust pipeline 13, which is far away from the fume hood 1, is connected with an air exhaust fan; the air supply variable air volume valve 3 is arranged in an air supply pipeline 14, the bottom of the air supply pipeline 14 is connected with an air supply outlet 9 on the upper surface of the fume hood 1, and one end of the air supply pipeline 14, which is far away from the fume hood 1, is connected with an air conditioning fresh air unit; the variable air volume valve controller 4 is a mcu single-chip microcomputer controller.
One end of an exhaust duct 13 is connected with an exhaust outlet 10 of a fume hood 1, the other end is connected with an exhaust fan, one end of a blast duct 14 is connected with an air supply outlet 9 on the upper surface of the fume hood 1, the other end is connected with an air conditioning fresh air unit, an exhaust variable air valve 2 is installed in the exhaust duct 13, an air supply variable air valve 3 is installed in the blast duct 14, the exhaust variable air valve 2, the air supply variable air valve 3, a displacement sensor 11 and a liquid crystal panel 12 installed on a side column are respectively connected with an air variable valve controller 4, then two groups of driving motors 7 are connected on the air variable valve controller 4 to complete installation, the control principle is that the air quantity is calculated through a valve height signal-air change quantity requirement setting signal-mcu, the air quantity value is controlled, the opening degrees of the exhaust variable air valve 2 and the air supply variable air valve 3 are controlled, the air quantity is measured through a flow sensor, the accurate control of the quantity keeping and the air quantity is controlled, the exhaust fan is provided with, calculate fume chamber 1 height of opening the door according to 11 signal acquisition of displacement sensor, the difference position of opening the door increases the volume of airing exhaust and increases the volume of airing exhaust according to proportional control air supplement valve aperture simultaneously, realizes the automatic control amount of wind, the utility model discloses a mend outdoor new trend in the cabinet, reduce room indoor air conditioner volume of airing exhaust, reach energy-conserving purpose, mainly by fume chamber 1, variable air valve controller 4, air exhaust variable air volume valve 2 and air supply variable air volume valve 3 constitute, rational in infrastructure, the construction is simple, has stronger practicality.
The variable air volume control explanation of the fume hood:
1. the method comprises the following steps of controlling the air speed of a ventilation cabinet surface in a displacement detection sensing mode, firstly, detecting the opening change of an adjusting door of an exhaust cabinet through a displacement sensor, controlling the exhaust volume of the exhaust cabinet, and keeping the air speed of the exhaust cabinet surface at a set value;
2. when the fume hood door is closed, the air volume valve maintains the minimum air exhaust volume of the fume hood so as to meet the actual requirement;
3. the monitor displays the actual surface wind speed value of the fume hood in real time;
4, acousto-optic alarm is carried out when the wind speed of the 4 surfaces exceeds a set range or equipment fails;
5. when the door position of the fume hood is too high, a sound and light alarm is given out, and when the wind speed of the fault surface is too high or too low, a sound and light alarm is given out;
6. when abnormal conditions occur, the emergency discharge mode control system is started to open all the air valves, and the maximum air volume which can be discharged in the discharge system is not controlled by the surface air speed value.
Room pressure differential control system principle:
the differential pressure control system has two control indexes: room pressure difference and lowest air exchange times of the room.
A) Air supply and air exhaust volume of a laboratory is continuously monitored, and constant pressure difference is achieved by adjusting the air supply and air exhaust volume.
B) When the air exhaust volume of the fume hood is increased, the control system detects the change of air exhaust, firstly, the air exhaust volume of a room is reduced to keep constant pressure difference, and if the air exhaust volume of the room is reduced to the minimum value and the pressure difference still does not meet the requirement, the air supply volume of the room is increased to keep constant pressure difference; when the air exhaust volume of the fume hood is reduced, the control system increases the air exhaust volume of a room to achieve constant pressure difference, and reduces the air supply volume of the room to achieve constant pressure difference if the air exhaust volume is increased to the maximum value and the pressure difference still does not meet the requirement; in order to ensure the control of the lowest ventilation times and temperature of the room, the air supply volume of the room is limited by the lowest value, and if the air exhaust volume of the fume hood is continuously reduced, the control system stops the air supply of the room at the lowest air volume and gives an alarm.
In the context of the present embodiment, the term "a", "b", "c", "d",
1. the basic data is the data of the basic data,
1) air inlet of exhaust cabinet, air inlet size: 1.2m wide and 0.6m high; air speed of an air inlet face: 0.5 m/s;
2) the design temperature of the room is 25 ℃ in summer and 22 ℃ in winter.
2. The non-supplemented air discharge hood discharges an amount of air discharged from the room of L =1.2 beta 0.6 beta 0.5 beta 3600=1296m3/h 。
3. Assuming that a split air conditioner is adopted in a room, when the exhaust cabinet exhausts air, air can be supplemented from an outer corridor of a laboratory through a laboratory door and an outer window seam (no consideration is given to the fact that the laboratory has a small amount of fresh air), if the supplemented corridor air temperature is 30 ℃ in summer cooling, the difference between the supplemented air temperature and the required room temperature of 25 ℃ is 30-25=5 ℃, and the sensible heat and cold quantity of the room to be supplemented is as follows: 1296 beta 1.2 beta 5 beta 0.24=1866 kcal/h =2.17kW, wherein: 1.2-specific gravity of air, kg/m3(ii) a 0.24-specific heat of air, kcal/kg. degree.C.
4. The energy efficiency ratio of a room air conditioner is about 2.8, and if it is considered that its sensible cooling capacity to total cooling capacity (sensible cooling capacity + latent cooling capacity) ratio is 0.85, the sensible energy efficiency ratio of the air conditioner is 2.8 beta 0.85= 2.38; based on the above analysis and calculation, when the exhaust hood without air supplement is adopted, in order to maintain the room temperature when the exhaust hood operates, the specification of the air conditioner needs to be increased, and the electric power of the air conditioner needs to be increased to be 2.17/2.38=0.91 kW.
5. The increased power consumption is needed for ensuring the room temperature during the whole summer cooling; the whole cooling period is generally counted by 4 months, the working day is 22 days/month, the operation time is counted by 10 hours each day, and then the operation hours of the cooling period are as follows: 4 beta 22 beta 10=880h and an increased air conditioning power consumption of 0.91kW beta 800h =728 kWh.
6. If the air supplement type fume hood is adopted, the air supplement ratio is 0.8, namely 80% of exhaust air volume is supplemented in the fume hood, the air supplement volume only consumes the energy consumption of a fan and does not consume cold, so that: the air conditioner only has electricity consumption of 0.2 of non-air supplement type exhaust cabinet, i.e. 728kWh beta 0.2=145.6kWh, and the air supplement fan has air quantity of 0.8 of exhaust air quantity, i.e. 1296m3/hΧ0.8=1036.8m3The wind pressure of the fan is calculated by 300Pa, the power of the motor obtained by checking a fan sample is 0.25kW, and the motor is operated in a cooling periodThe hours are likewise 880h, the blower has a power consumption of 0.25kW beta 880h =220 kWh.
In summary, the power consumption of the air supply type exhaust cabinet in the cold supplying period is 145.6+220=365.6kWh, the energy saving ratio is 362.4/728=49.7% and approximately 50% compared with the non-air supply type exhaust cabinet, and the power consumption is 728-365.6=362.4 kWh.
Description of the drawings:
1) the electricity saving amount of the air conditioner in winter can be calculated by the same method.
2) In the above calculation, the air entering the exhaust cabinet due to the room negative pressure permeation is considered to enter from the corridor during the operation, the temperature difference with the room is small, if the air is mainly accessed from the outside, the temperature difference is large, the air conditioning air volume of the room is large, the energy consumption is also large, and the energy saving ratio of the air supplement type exhaust cabinet is increased.
The details of the present invention are well known to those skilled in the art.
Finally, it is to be noted that: the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the examples, it should be understood by those skilled in the art that the technical solutions of the present invention can be modified and replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the scope of the claims of the present invention.
Claims (7)
1. The utility model provides an exhaust control mechanism for fume chamber mends wind which characterized in that: the air conditioner comprises a ventilation cabinet (1), an exhaust variable air volume valve (2), an air supply variable air volume valve (3) and a variable air volume valve controller (4), wherein the upper surface of the ventilation cabinet (1) is connected with the exhaust variable air volume valve (2) and the air supply variable air volume valve (3), and the variable air volume valve controller (4) is respectively connected with the ventilation cabinet (1), the exhaust variable air volume valve (2) and the air supply variable air volume valve (3);
the ventilating hood comprises a ventilating hood (1), wherein an air cavity is formed in the upper end of the ventilating hood (1), an opening is formed in the middle position of the surface of the ventilating hood (1), a lifting door (6) is arranged between upright columns (5) on two sides of the ventilating hood (1), a driving motor (7) is arranged at the bottom of the ventilating hood (1), the driving motor (7) is linked with the lifting door (6) through a chain (8), the lifting door (6) is movably arranged at the opening on the surface of the ventilating hood (1), an air supply opening (9) and an air exhaust opening (10) are formed in the upper end of the ventilating hood (1), the air supply opening (9) and the air exhaust opening (10) are communicated with the air cavity of the ventilating hood (1), a displacement sensor (11) is arranged at the position, where the ventilating hood (1) is located, a liquid crystal panel (12) is arranged on any upright column (5) of the ventilating hood (1), the ventilation cabinet (1) is connected with the variable air volume valve controller (4) through a liquid crystal panel (12);
the air exhaust variable air volume valve (2), the air exhaust variable air volume valve (2) is installed in an air exhaust pipeline (13), and the bottom of the air exhaust pipeline (13) is connected with an air exhaust opening (10) on the upper surface of the fume hood (1);
the air supply variable air volume valve (3), the air supply variable air volume valve (3) is installed in an air supply pipeline (14), and the bottom of the air supply pipeline (14) is connected with an air supply outlet (9) on the upper surface of the ventilation cabinet (1);
and the variable air volume valve controller (4), wherein the variable air volume valve controller (4) is a mcu single-chip microcomputer controller.
2. An exhaust control mechanism for a fumehood according to claim 1, wherein: fume chamber (1) lower extreme is provided with base (15), base (15) surface of fume chamber (1) lower extreme is provided with the cabinet door, driving motor (7) set up in base (15), stand (5) inboard of fume chamber (1) both sides has all been opened the slide, stand (5) top is provided with supporting wheel (16), driving motor (7) link to each other with chain (8) bottom, chain (8) top links to each other with supporting wheel (16).
3. An exhaust control mechanism for a fumehood according to claim 1, wherein: connecting rods (17) are respectively arranged on two sides of the lifting door (6), the connecting rods (17) are arranged in sliding groove channels of the upright columns (5) on two sides of the ventilation cabinet (1), and two sides of the lifting door (6) are connected with the chains (8) through the connecting rods (17).
4. An exhaust control mechanism for a fumehood according to claim 1, wherein: the height of an opening formed in the middle of the surface of the ventilation cabinet (1) is not more than that of the lifting door (6).
5. An exhaust control mechanism for a fumehood according to claim 1, wherein: one end of the exhaust duct (13) far away from the fume hood (1) is connected with an exhaust fan.
6. An exhaust control mechanism for a fumehood according to claim 1, wherein: and one end of the air supply pipeline (14) far away from the fume hood (1) is connected with an air conditioning fresh air unit.
7. An exhaust control mechanism for a fumehood according to claim 1, wherein: the driving motor (7) is a servo synchronous speed reducing motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201922243006.2U CN211191353U (en) | 2019-12-16 | 2019-12-16 | Air exhaust control mechanism for air supplement of ventilation cabinet |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922243006.2U CN211191353U (en) | 2019-12-16 | 2019-12-16 | Air exhaust control mechanism for air supplement of ventilation cabinet |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113465073A (en) * | 2021-06-21 | 2021-10-01 | 青岛海尔空调电子有限公司 | Control method of ventilation system and ventilation system |
| CN113457415A (en) * | 2021-06-16 | 2021-10-01 | 浙江农林大学 | Air filtering device for laboratory development |
| CN114247722A (en) * | 2021-11-19 | 2022-03-29 | 北京戴纳实验科技有限公司 | Ventilation experiment cabinet capable of adjusting temperature and air quantity |
| CN117102190A (en) * | 2023-10-25 | 2023-11-24 | 浙江之科云启科技有限公司 | Fume hood for biological experiments |
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2019
- 2019-12-16 CN CN201922243006.2U patent/CN211191353U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113457415A (en) * | 2021-06-16 | 2021-10-01 | 浙江农林大学 | Air filtering device for laboratory development |
| CN113457415B (en) * | 2021-06-16 | 2022-08-30 | 浙江农林大学 | Air filtering device for laboratory development |
| CN113465073A (en) * | 2021-06-21 | 2021-10-01 | 青岛海尔空调电子有限公司 | Control method of ventilation system and ventilation system |
| CN113465073B (en) * | 2021-06-21 | 2023-05-26 | 青岛海尔空调电子有限公司 | Control method of ventilation system and ventilation system |
| CN114247722A (en) * | 2021-11-19 | 2022-03-29 | 北京戴纳实验科技有限公司 | Ventilation experiment cabinet capable of adjusting temperature and air quantity |
| CN117102190A (en) * | 2023-10-25 | 2023-11-24 | 浙江之科云启科技有限公司 | Fume hood for biological experiments |
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