Air uniformizing and noise reducing device for multiple ventilation cabinets
By designing multiple fume hood uniform and noise reduction devices, the structure of the uniform air hood and ventilation branch pipes is used to solve the problems of air rushing and noise in the fume hood, achieving uniform distribution of air volume and reducing noise.
Patent Information
- Application Number
- CN202421847966.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-01
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-08-01
AI Technical Summary
The existing fume hood has a problem of air rushing when ventilating, and the air volume cannot be distributed evenly, and noise will be generated.
A multiple fume hood uniform and noise reduction device is designed, including a uniform air hood, ventilation main pipe, ventilation branch pipe and sound silence structure. The uniform air blower achieves uniform air volume distribution through the combination of a conical structure and a ventilation valve; the ventilation branch pipe reduces noise through the setting of a silence bowl and a silence sleeve.
It effectively avoids the phenomenon of wind rushing, achieves uniform distribution of air volume, and significantly reduces noise during ventilation.
Smart Images
Figure CN223028066U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of laboratory facilities, in particular to a multi-fume hood air distribution and noise reduction device. Background Technique
[0002] The fume hood is an indispensable part of the laboratory ventilation design, which plays the functions of exhaust and ventilation in the laboratory. According to the air inlet mode, the laboratory fume hood can be divided into full-exhaust fume hood, makeup air fume hood and variable air volume fume hood. At present, when the makeup air fume hood is in use, ventilation pipelines are mostly laid above the top of the fume hood, and opening and closing valves are arranged at the places where the ventilation pipelines are connected to the cabinets. The ventilation pipelines of multiple fume hoods are connected through the same main pipeline. When ventilating, the air first enters the main pipeline. When a certain opening and closing valve is opened, the air in the main pipeline enters the corresponding fume hood along the ventilation pipeline to achieve ventilation. However, in this ventilation method, the air will enter other ventilation pipelines, resulting in the problem of air leakage, and the uniform distribution of air volume cannot be achieved. When multiple fume hoods are ventilated at the same time, the air intake of the fume hood close to the air inlet end of the main pipeline is different from that of the fume hood far from the air inlet end of the main pipeline, which affects the use effect and will generate a certain amount of noise. Based on this, this application proposes a multi-fume hood air distribution and noise reduction device. Content of the Utility Model
[0003] The utility model provides a multi-fume hood air distribution and noise reduction device, which solves the problems of air leakage, uneven air volume distribution and noise mentioned in the above background technique.
[0004] The utility model provides the following technical scheme: A multi-fume hood air distribution and noise reduction device includes a uniform air distribution air box. In the middle of one end of the uniform air distribution air box, there is a ventilation main pipe. The bottom of the uniform air distribution air box is evenly provided with air outlet holes. A ventilation branch pipe is fixed at the bottom of the air outlet hole. The other end of the ventilation branch pipe is connected to the laboratory fume hood. A ventilation valve is arranged in the inner cavity of the uniform air distribution air box. The ventilation valve includes a rotating ring movably connected to the inner cavity of the uniform air distribution air box and a rotating motor fixedly connected to the uniform air distribution air box. The rotating ring is provided with a connection hole, and the connection hole is adapted to the air outlet hole. A toothed ring is fixedly connected to the outer surface of the rotating ring. The end of the output shaft of the rotating motor is fixedly connected with a gear, and the gear meshes with the toothed ring; the static wind pressure at each place in the inner cavity of the uniform air distribution air box is the same;
[0005] The ventilation branch pipe includes a support pipe fixedly connected to the uniform air distribution air box. The inner wall of the support pipe is evenly fixedly connected with sound-absorbing bowls, and the outer surface of the support pipe is wrapped with a sound-absorbing sleeve.
[0006] Preferably, the inner cavity of the uniform air distribution air box is of a conical structure. The inner diameter of the uniform air distribution air box near the ventilation main pipe is larger than that of the other end, and the inner wall of the rotating ring is flush with the inner wall of the uniform air distribution air box.
[0007] Preferably, the tube wall of the support tube is a hollow structure, and the inner cavity of the tube wall of the support tube is in a vacuum state.
[0008] Preferably, the sound-absorbing bowl is a conical structure, the inner diameter of the sound-absorbing bowl near the air outlet hole is smaller than that of the other end, and the inner diameter of the sound-absorbing bowl is larger than the inner diameter of the air outlet hole.
[0009] Preferably, sound-absorbing holes are provided on both the sound-absorbing sleeve and the sound-absorbing bowl; sound-absorbing plates are wrapped on the outer surfaces of both the air distribution air box and the main ventilation pipe.
[0010] Compared with the prior art, the utility model has the following beneficial effects:
[0011] 1. For this multi-ventilation cabinet air distribution and noise reduction device, the ventilation valve for controlling ventilation is arranged in the air distribution air box. When the ventilation valve is in a closed state, air cannot enter the ventilation branch pipe, thus avoiding the phenomenon of air leakage; through the setting of the air distribution air box, by changing its inner diameter, the static wind pressure values at various parts inside the air distribution air box are made the same, so that the air volumes discharged from each air outlet hole can be the same, achieving the purpose of uniform air volume distribution.
[0012] 2. For this multi-ventilation cabinet air distribution and noise reduction device, through the setting of the ventilation branch pipe, the ventilation branch pipe reduces the noise generated during ventilation by slowing down the wind speed, reflecting and absorbing sound waves, reducing the amount of sound transmitted to the outside, and absorbing the noise transmitted to the outside, facilitating the use of this device. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 is a front schematic view of the structure of the utility model;
[0014] Figure 2 is the Figure 1 bottom schematic view of the structure of the utility model;
[0015] Figure 3 is the Figure 1 sectional schematic view of the structure of the utility model;
[0016] Figure 4 is the sectional schematic view of the air distribution air box of the structure of the utility model;
[0017] Figure 5 is the Figure 3 magnified schematic view of A in the structure of the utility model.
[0018] In the figure: 1. Air distribution air box; 2. Main ventilation pipe; 3. Ventilation branch pipe; 4. Rotating motor; 5. Gear; 6. Sound-absorbing bowl; 7. Sound-absorbing sleeve; 8. Support tube; 9. Rotating ring; 10. Tooth ring; 11. Air outlet hole; 12. Connecting hole. DETAILED DESCRIPTION
[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0020] The utility model provides a device for uniform wind and noise reduction of multiple fume hoods, including an air uniforming box 1, the inner cavity of the air uniforming box 1 is a conical structure, the static wind pressure values at various locations of the air uniforming box 1 are the same, the bottom of the air uniforming box 1 is evenly provided with air outlet holes 11, the bottom of the air outlet holes 11 is fixedly connected with a ventilation branch pipe 3, the middle of one end of the air uniforming box 1 is fixedly connected with a ventilation main pipe 2, and the inner diameter of one end of the air uniforming box 1 close to the ventilation main pipe 2 is larger than the inner diameter of the other end. Through the arrangement of the air uniforming box 1, the air volume discharged from the air outlet holes 11 at various locations is the same, achieving the purpose of uniform ventilation distribution.
[0021] One end of the ventilation branch pipe 3 away from the air outlet 11 is connected to the laboratory fume hood, and a ventilation valve is provided in the inner cavity of the air equalizing bellows 1, and the ventilation valve includes a swivel 9 movably connected to the inner cavity of the air equalizing bellows 1 and a rotating motor 4 fixedly connected to the air equalizing bellows 1, the outer diameters of the two adjacent swivels 9 are the same, and the outer diameters of each part of the swivel 9 are the same, which is convenient for the rotation of the swivel 9, the inner wall of the swivel 9 is flush with the inner wall of the air equalizing bellows 1, and a connecting hole 12 is provided on the swivel 9, which is adapted to the air outlet 11, and a gear ring 10 is fixedly connected to the outer surface of the swivel 9, and a gear 5 is fixedly connected to the output shaft end of the rotating motor 4 through a reducer, and the gear 5 is meshed with the gear ring 10. By setting the rotating motor 4, the rotation of the rotating motor 4 can drive the gear 5 fixedly connected thereto to rotate, and the gear 5 can drive the swivel 9 to rotate through the gear ring 10 meshing therewith. The rotation of the swivel 9 changes the position of the connecting hole 12, and the connecting hole 12 can be staggered or overlapped with the air outlet hole 11. When the connecting hole 12 and the air outlet hole 11 are in a staggered state, the wind in the air equalizing bellows 1 cannot enter the ventilation branch pipe 3. When the connecting hole 12 and the air outlet hole 11 are in an overlapping state, the wind in the air equalizing bellows 1 can enter the ventilation branch pipe 3, thereby preventing the occurrence of wind blowby when the device is in use.
[0022] The ventilation branch pipe 3 comprises a support pipe 8 fixedly connected to the wind box 1, the inner wall of the support pipe 8 is evenly and fixedly connected with a silencer bowl 6, and the outer surface of the support pipe 8 is wrapped with a silencer sleeve 7. The pipe wall of the support pipe 8 is a hollow structure, and the inner cavity of the pipe wall of the support pipe 8 is in a vacuum state. By setting the support pipe 8, the sound insulation performance of the support pipe 8 can be improved, and the influence of the sound inside the support pipe 8 on the external environment can be reduced.
[0023] The sound-absorbing bowl 6 is of a conical structure. The inner diameter of the sound-absorbing bowl 6 at one end close to the air outlet hole 11 is smaller than that at the other end. The inner diameter of the sound-absorbing bowl 6 is larger than the inner diameter of the air outlet hole 11. The size of the sound-absorbing bowl 6 is designed according to requirements and is not limited here. Through the setting of the sound-absorbing bowl 6, the speed of the air entering the ventilation branch pipe 3 is reduced, the noise is reduced, and the sound-absorbing bowl 6 can reflect the sound waves to further reduce the noise.
[0024] Both the sound-absorbing sleeve 7 and the sound-absorbing bowl 6 are provided with sound-absorbing holes; the outer surfaces of the air distribution air box 1 and the main ventilation pipe 2 are both wrapped with sound-absorbing plates. Through the setting of the sound-absorbing holes and the sound-absorbing plates, the noise can be absorbed to further reduce the noise generated when the device is used, facilitating the use of the device.
[0025] In summary: When the multi-fume hood air distribution and noise reduction device is in use, the other end of the main ventilation pipe 2 is connected to the air outlet end of a device for ventilating the laboratory fume hood, such as the air outlet of a ventilation fan. The air enters the interior of the air distribution air box 1 through the main ventilation pipe 2. The air in the air distribution air box 1 enters the inner cavity of the ventilation branch pipe 3 through the overlapping connection holes 12 and air outlet holes 11. The air in the inner cavity of the ventilation branch pipe 3 enters the laboratory fume hood to achieve the purpose of ventilating the laboratory fume hood. When the air enters the ventilation branch pipe 3, the wind speed is reduced, the noise generated by the air flow is reduced, the sound-absorbing bowl 6 reflects and absorbs the sound waves to further reduce the noise generated by the air flow, and the sound-absorbing sleeve 7 and the support pipe 8 can reduce the noise transmitted from the inside of the ventilation branch pipe 3 to the outside, further reducing the noise generated when the device is in use and facilitating the use of the device; after ventilation, the rotation motor 4 is used to drive the gear 5 to rotate. The gear 5 drives the rotating ring 9 to rotate through the engaged toothed ring 10. The rotating ring 9 drives the connection hole 12 to move until the connection hole 12 and the air outlet hole 11 are in a staggered state. At this time, the ventilation branch pipe 3 is in a closed state, and the air cannot enter the ventilation branch pipe 3, and at the same time, the phenomenon of air leakage can be avoided.
[0026] The standard parts used in the present utility model can all be purchased from the market. The special-shaped parts can be customized according to the descriptions in the specification and the drawings. The specific connection methods of each part all adopt conventional means such as bolts, rivets, and welding that are mature in the prior art. The machines, parts, and equipment all adopt conventional models in the prior art and will not be elaborated here. The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art. Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirits of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.
Claims
1. A device for uniform wind flow and noise reduction for multiple fume hoods, comprising a uniform wind box (1), characterized in that: A ventilation main pipe (2) is provided in the middle of one end of the air-distributing wind box (1), air outlet holes (11) are evenly provided at the bottom of the air-distributing wind box (1), a ventilation branch pipe (3) is fixed at the bottom of the air outlet holes (11), and the other end of the ventilation branch pipe (3) is connected to the laboratory fume hood. A ventilation valve is provided in the inner cavity of the air-distributing wind box (1), and the ventilation valve comprises a rotating ring (9) movably connected to the inner cavity of the air-distributing wind box (1) and a rotating motor (4) fixedly connected to the air-distributing wind box (1), a connecting hole (12) is provided on the rotating ring (9), and the connecting hole (12) is adapted to the air outlet holes (11), a gear ring (10) is fixedly connected to the outer surface of the rotating ring (9), and a gear (5) is fixedly connected to the end of the output shaft of the rotating motor (4), and the gear (5) is meshed with the gear ring (10); the static wind pressure at various locations in the inner cavity of the air-distributing wind box (1) is the same; The ventilation branch pipe (3) comprises a support pipe (8) fixedly connected to the air distribution bellows (1), the inner wall of the support pipe (8) is evenly and fixedly connected with a silencer bowl (6), and the outer surface of the support pipe (8) is wrapped with a silencer sleeve (7).
2. The device for uniform air flow and noise reduction for multiple fume hoods according to claim 1, characterized in that: The inner cavity of the air distribution bellows (1) is a conical structure, the inner diameter of one end of the air distribution bellows (1) close to the ventilation main pipe (2) is larger than the inner diameter of the other end, and the inner wall of the rotating ring (9) is flush with the inner wall of the air distribution bellows (1).
3. The device for uniform air flow and noise reduction for multiple fume hoods according to claim 1, characterized in that: The tube wall of the support tube (8) is a hollow structure, and the inner cavity of the tube wall of the support tube (8) is in a vacuum state.
4. The device for uniform air flow and noise reduction for multiple fume hoods according to claim 1, characterized in that: The silencer bowl (6) is a conical structure, the inner diameter of one end of the silencer bowl (6) close to the air outlet (11) is smaller than the inner diameter of the other end thereof, and the inner diameter of the silencer bowl (6) is larger than the inner diameter of the air outlet (11).
5. The device for uniform air flow and noise reduction for multiple fume hoods according to claim 1, characterized in that: Both the silencer sleeve (7) and the silencer bowl (6) are provided with sound-absorbing holes, and the outer surface of the air-distributing bellows (1) and the outer surface of the ventilation main pipe (2) are wrapped with sound-absorbing panels.