Energy-saving fume hood with air curtain

Abstract

This utility model discloses an air curtain type energy-saving fume hood, including an air curtain type fume hood with an air inlet on one side and an exhaust outlet on the other side. A stepper motor is fixedly installed inside the air curtain type fume hood between the air inlet and the exhaust outlet. The output shaft of the stepper motor is connected to a transmission shaft via a coupling, and a gear is fixedly sleeved on the outer surface of the transmission shaft. This utility model replaces the filters inside the air inlet and exhaust outlet, which have been in operation for a week, with clean filters every week. This prevents excessive impurities adsorbed on the filters, thus avoiding the need for the intake fan to operate under load to maintain the negative pressure environment and specified exhaust volume inside the air curtain type fume hood. This technical solution reduces the power consumption of the intake fan during long-term operation of the air curtain type fume hood, improving the energy-saving effect of the equipment itself.

Description

Technical Field

[0001] This utility model relates to the field of fume hood technology, specifically an air curtain type energy-saving fume hood. Background Technology

[0002] A fume hood is a device that uses a mechanical ventilation system to remove harmful gases, dust, fumes, and other pollutants generated during experiments from a laboratory. It typically consists of a cabinet, ventilation ducts, and an exhaust system, and can effectively control the spread of pollutants, providing a relatively safe working environment for laboratory personnel.

[0003] To improve safety and prevent turbulent airflow in the laboratory from affecting experiments inside the fume hood, some existing fume hoods have air outlets at their openings, which deliver air at a certain speed and direction to form a uniform and stable air curtain at the operating opening. This air curtain can effectively block harmful gases from spreading outward from the hood and prevent outside air from entering the hood, thus creating a relatively isolated area inside and outside the hood. Such fume hoods with air curtains can be called air curtain type fume hoods.

[0004] However, as the usage time of this type of air curtain fume hood increases, its internal filter screen will gradually become filled and clogged with dust. As the filter screen adsorbs more impurities, the resistance of air passing through the filter screen will also increase. Subsequently, in order to maintain the negative pressure environment inside the fume hood and the specified exhaust volume, the fan on the fume hood needs to provide greater pressure to overcome the resistance of the filter screen. This increases the load on the fan, and the motor needs to consume more electrical energy to drive the fan, thereby increasing the energy consumption of the equipment during operation. Therefore, it does not meet the current needs. To address this, we propose the air curtain type energy-saving fume hood. Utility Model Content

[0005] The purpose of this invention is to provide an air curtain type energy-saving fume hood to solve the problems mentioned in the background art, such as the gradual filling and clogging of the internal filter screen by dust as the usage time of this type of air curtain fume hood increases, the resistance of air passing through the filter screen also increases as the impurities adsorbed by the filter screen increase, and then in order to maintain the negative pressure environment and the specified exhaust volume inside the fume hood, the fan on the fume hood needs to provide greater pressure to overcome the resistance of the filter screen, which increases the load on the fan, and the motor needs to consume more electrical energy to drive the fan, thereby increasing the energy consumption of the equipment during operation.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an air curtain type energy-saving fume hood, comprising an air curtain type fume hood, wherein an air inlet is provided on one side of the interior of the air curtain type fume hood, and an exhaust port is provided on one side of the air inlet. A stepper motor is fixedly installed inside the air curtain type fume hood between the air inlet and the exhaust port. The output shaft of the stepper motor is connected to a transmission shaft through a coupling. A gear is fixedly sleeved on the outer surface of the transmission shaft. A gear ring meshes on both sides of the outer surface of the gear. A circular plate is fixedly fixed on the inner side of the gear ring. A filter screen is fixedly installed on both sides of the outer surface of the circular plate.

[0007] Both the air inlet and the air outlet are equipped with a fan blade. The fan blade is connected to a concave rotating shaft. One side of the outer surface of the concave rotating shaft is concave. A metal sleeve is movably fitted on both sides of the concave outer surface of the concave rotating shaft. The lower end of the metal sleeve is connected to a pull rod through the rotating shaft. The lower end of the pull rod is connected to a push rod through the rotating shaft, and the push rod is located above the circular plate.

[0008] Preferably, the second filter screen from left to right on the outer surface of the circular plate in front of the stepper motor is located inside the exhaust hole, and the first filter screen from left to right on the outer surface of the circular plate behind the stepper motor is located inside the air inlet hole.

[0009] Preferably, the outer side of the filter screen is provided with an annular groove located on the upper surface of the circular plate, and a rubber ring is fixed inside the annular groove, and the position of the rubber ring corresponds to the position of the push rod.

[0010] Preferably, the outer side of the push rod is provided with a guide hole located inside the air curtain type fume hood, the outer surface of the push rod is in contact with the inner wall of the guide hole, and the push rod and the guide hole are slidably connected.

[0011] Preferably, a positioning shaft is installed in the middle of the inner side of the circular plate. The top and bottom ends of the positioning shaft are located inside the air curtain type fume hood shell, and the positioning shaft located inside the air curtain type fume hood shell is connected to the air curtain type fume hood through roller bearings.

[0012] Preferably, the air curtain type fume hood is provided with a ventilation pipe at the top, and an air intake fan is fixedly installed inside the air inlet hole on one side of the lower end face of the ventilation pipe. An exhaust fan is fixedly installed inside the exhaust hole in front of the air intake fan, and the exhaust fan is connected to the ventilation pipe.

[0013] Preferably, a protective cover is provided above the stepper motor on the upper surface of the air curtain type fume hood, and the air curtain type fume hood and the protective cover are fixed together by screws;

[0014] Below the circular plate is a sliding mounting groove located on the outer surface of the air curtain type fume hood, and a dust collection box is slidably installed inside the sliding mounting groove.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. This utility model uses a stepper motor to replace the filters that have been working for a week inside the air inlet and exhaust vents with clean filters every week. This prevents the air intake fan from needing to run under load to maintain the negative pressure environment and specified exhaust volume inside the air curtain fume hood due to excessive impurities adsorbed on the filters. The above technical solution can reduce the power consumption of the air intake fan on the air curtain fume hood during long-term operation and improve the energy-saving effect of the equipment itself.

[0017] 2. This utility model, through the replacement of the filter screens located inside the air inlet and exhaust outlet via a stepper motor, will move the filter screen, which has been working for a week, to a position opposite to the push rod. Then, when the air intake or exhaust fan on the air curtain fume hood is started to pump or extract gas into or from the air curtain fume hood, the two corresponding fan blades will rotate accordingly. The rotating fan blades will eventually cause the filter screen, which has been working for a week, to vibrate, thereby shaking off the dust on the outer surface of the filter screen. The above technical solution can automatically clean the dust adhering to the filter screen. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a front view of the entire utility model;

[0020] Figure 3 This utility model Figure 2 Enlarged view of the structure at point A in the middle;

[0021] Figure 4 This utility model Figure 3 Enlarged view of the structure at point B in the middle.

[0022] In the diagram: 1. Air curtain type fume hood; 2. Ventilation duct; 3. Air intake fan; 4. Exhaust fan; 5. Air inlet; 6. Exhaust vent; 7. Stepper motor; 8. Drive shaft; 9. Gear; 10. Gear ring; 11. Circular plate; 12. Filter screen; 13. Fan blade; 14. Concave shaft; 15. Metal sleeve; 16. Pull rod; 17. Push rod; 18. Sliding mounting groove; 19. Dust collection box. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0024] The air curtain type fume hood 1 (model F-01), stepper motor 7 (model DM542) and fan blade 13 (model 007) mentioned in this utility model can be obtained from the market or through private customization.

[0025] Please see Figures 1 to 4 An embodiment of this utility model is provided: an air curtain type energy-saving fume hood, including an air curtain type fume hood 1. An air inlet 5 is provided on one side of the interior of the air curtain type fume hood 1, and an exhaust vent 6 is provided on one side of the air inlet vent 5. A stepper motor 7 is fixedly installed inside the air curtain type fume hood 1 between the air inlet vent 5 and the exhaust vent 6. The output shaft of the stepper motor 7 is connected to a transmission shaft 8 through a coupling. A gear 9 is fixedly sleeved on the outer surface of the transmission shaft 8. A gear ring 10 meshes on both sides of the outer surface of the gear 9. A circular plate 11 is fixedly fixed on the inner side of the gear ring 10. A filter screen 12 is fixedly installed on both sides of the outer surface of the circular plate 11.

[0026] Both the air inlet 5 and the air outlet 6 are equipped with a fan blade 13. The fan blade 13 is connected to a concave rotating shaft 14. One side of the outer surface of the concave rotating shaft 14 is concave. A metal sleeve 15 is movably fitted on both sides of the outer surface of the concave part of the concave rotating shaft 14. The lower end face of the metal sleeve 15 is connected to a pull rod 16 through the rotating shaft. The lower end face of the pull rod 16 is connected to a push rod 17 through the rotating shaft. The push rod 17 is located above the circular plate 11.

[0027] The air curtain type fume hood 1 is provided with a ventilation pipe 2 at the top. One side of the lower end of the ventilation pipe 2 is connected to an intake fan 3 that is fixedly installed inside the air inlet 5. An exhaust fan 4 is fixedly installed inside the exhaust vent 6 in front of the intake fan 3, and the exhaust fan 4 is connected to the ventilation pipe 2. When it is necessary to inject gas into the air curtain type fume hood 1, the intake fan 3 can be started. When it is necessary to extract gas from the air curtain type fume hood 1, the exhaust fan 4 can be started.

[0028] The second filter screen 12 from left to right on the outer surface of the circular plate 11 located in front of the stepper motor 7 is located inside the exhaust hole 6, and the first filter screen 12 from left to right on the outer surface of the circular plate 11 located behind the stepper motor 7 is located inside the air inlet 5; the gas can be filtered by passing through the two filters 12 located inside the air inlet 5 and the exhaust hole 6 respectively during the flow process.

[0029] When the equipment has been running for a week, the stepper motor 7 is started. The stepper motor 7 drives the transmission shaft 8 connected to it and the gear 9 fixedly sleeved on the outer surface of the transmission shaft 8 to rotate. When the gear 9 rotates, the two gear rings 10 meshing with it and the two circular plates 11 fixed inside the two gear rings 10 will rotate synchronously. When the circular plate 11 rotates 180 degrees, the positions of the two filter screens 12 located on the outer surface of the circular plate 11 will change accordingly. After the positions of the two filter screens 12 located on the outer surfaces of the two circular plates 11 are switched, the stepper motor 7 is turned off. Through the above technical solution, the filter screens 12 inside the air inlet 5 and the air outlet 6 that have been working for a week are replaced every week. This is to prevent the excessive impurities adsorbed on the filter screens 12 from causing the fan to need to run under load to maintain the negative pressure environment and the specified exhaust volume inside the air curtain type fume hood 1. This structure can reduce the power consumption of the fan on the air curtain type fume hood 1 during long-term operation and improve the energy-saving effect of the equipment itself.

[0030] The push rod 17 has a guide hole located inside the air curtain type fume hood 1 on its outer side. The outer surface of the push rod 17 is in contact with the inner wall of the guide hole, and the push rod 17 is slidably connected to the guide hole. When the air intake fan 3 or exhaust fan 4 on the air curtain type fume hood 1 is started to pump or extract gas into or from the air curtain type fume hood 1, the fan blades 13 located inside the air intake hole 5 or exhaust hole 6 will rotate accordingly. The rotating fan blades 13 can... It can drive the concave rotating shaft 14 connected to the axis of the wind turbine blade 13 to rotate. When the concave rotating shaft 14 rotates, the metal sleeve 15, which is movably sleeved on the concave part of the outer surface of the concave rotating shaft 14, will revolve around the connection between the wind turbine blade 13 and the concave rotating shaft 14. During the revolution of the metal sleeve 15, the push rod 17 connected to it through the pull rod 16 will move up and down in a cycle. The guide through hole located on the outside of the push rod 17 can ensure that the push rod 17, which moves up and down, remains in a vertical state.

[0031] When the push rod 17 is pushed downward, it will hit the circular plate 11 located below it, causing it to vibrate. When the circular plate 11 vibrates, the filter screen 12, which has been working for a week and whose position has been changed, will also vibrate. This vibration can shake off the dust on the outer surface of the filter screen 12. The above technical solution can automatically clean the dust adhering to the filter screen 12.

[0032] Below the circular plate 11 is a sliding mounting groove 18 located on the outer surface of the air curtain type fume hood 1. A dust collection box 19 is slidably installed inside the sliding mounting groove 18. The dust that is shaken off will eventually fall into the dust collection box 19. After the equipment has been running for a year, the dust collection box 19 is removed and the dust inside is cleaned.

[0033] The outer side of the filter screen 12 is provided with an annular groove on the upper end face of the circular plate 11. A rubber ring is fixed inside the annular groove, and the position of the rubber ring corresponds to the position of the push rod 17. The rubber ring can reduce the damage caused to the circular plate 11 when the push rod 17 hits it, thereby increasing its service life.

[0034] A positioning shaft is installed in the middle of the inner side of the circular plate 11. The top and bottom ends of the positioning shaft are located inside the outer shell of the air curtain type fume hood 1. The positioning shaft inside the outer shell of the air curtain type fume hood 1 is connected to the air curtain type fume hood 1 by roller bearings. The positioning shaft can ensure the stability of the circular plate 11 when it rotates and prevent it from being misaligned.

[0035] A protective cover plate is provided above the stepper motor 7 on the upper surface of the air curtain type fume hood 1, and the air curtain type fume hood 1 and the protective cover plate are fixed together by screws; the protective cover plate can seal and protect the stepper motor 7.

[0036] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An air curtain type energy-saving fume hood, comprising an air curtain type fume hood (1), characterized in that: An air inlet (5) is provided on one side of the air curtain type fume hood (1), and an exhaust hole (6) is provided on one side of the air inlet (5). A stepper motor (7) is fixedly installed inside the air curtain type fume hood (1) between the air inlet (5) and the exhaust hole (6). The output shaft of the stepper motor (7) is connected to a transmission shaft (8) through a coupling. A gear (9) is fixedly sleeved on the outer surface of the transmission shaft (8). A gear ring (10) meshes on both sides of the outer surface of the gear (9). A circular plate (11) is fixedly fixed on the inner side of the gear ring (10). A filter screen (12) is fixedly installed on both sides of the outer surface of the circular plate (11). The air inlet (5) and the air outlet (6) are each provided with a fan blade (13). The fan blade (13) is connected to a concave rotating shaft (14) at its axis. One side of the outer surface of the concave rotating shaft (14) is concave. A metal sleeve (15) is movably fitted on both sides of the concave outer surface of the concave rotating shaft (14). The lower end face of the metal sleeve (15) is connected to a pull rod (16) through the rotating shaft. The lower end face of the pull rod (16) is connected to a push rod (17) through the rotating shaft. The push rod (17) is located above the circular plate (11).

2. The air curtain type energy-saving fume hood according to claim 1, characterized in that: The second filter screen (12) from left to right on the outer surface of the circular plate (11) in front of the stepper motor (7) is located inside the exhaust hole (6), and the first filter screen (12) from left to right on the outer surface of the circular plate (11) behind the stepper motor (7) is located inside the air inlet hole (5).

3. The air curtain type energy-saving fume hood according to claim 1, characterized in that: The filter screen (12) has an annular groove on the upper surface of the circular plate (11) on its outer side. A rubber ring is fixed inside the annular groove, and the position of the rubber ring corresponds to the position of the push rod (17).

4. The air curtain type energy-saving fume hood according to claim 1, characterized in that: The push rod (17) has a guide hole located inside the air curtain type fume hood (1) on its outer side. The outer surface of the push rod (17) is in contact with the inner wall of the guide hole, and the push rod (17) and the guide hole are slidably connected.

5. The air curtain type energy-saving fume hood according to claim 1, characterized in that: The inner middle of the inner side of the circular plate (11) is fitted with a positioning shaft. The top and bottom ends of the positioning shaft are located inside the outer shell of the air curtain type fume hood (1). The positioning shaft located inside the outer shell of the air curtain type fume hood (1) is connected to the air curtain type fume hood (1) by a roller bearing.

6. The air curtain type energy-saving fume hood according to claim 1, characterized in that: The air curtain type fume hood (1) is provided with a ventilation pipe (2) above it. A fan (3) is fixedly installed inside the air inlet (5) on one side of the lower end face of the ventilation pipe (2). A fan (4) is fixedly installed inside the exhaust hole (6) in front of the fan (3). The fan (4) is connected to the ventilation pipe (2).

7. The air curtain type energy-saving fume hood according to claim 1, characterized in that: The stepper motor (7) is provided with a protective cover plate located on the upper end face of the air curtain type ventilation cabinet (1), and the air curtain type ventilation cabinet (1) and the protective cover plate are fixed together by screws; The circular plate (11) is provided with a sliding mounting groove (18) on the outer surface of the air curtain type fume hood (1), and a dust collection box (19) is slidably installed inside the sliding mounting groove (18).

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