Air guide mechanism for laboratory fume hood

Abstract

The utility model relates to the field of ventilation cabinet air guide, in particular to an air guide mechanism for a laboratory ventilation cabinet, which comprises a ventilation cabinet, an explosion-proof plate in sliding connection is arranged in the ventilation cabinet, a stepping motor I is fixedly mounted in the ventilation cabinet through a bolt, and a spur gear with a shaft is arranged in the ventilation cabinet in rotating connection. Rollers I are fixedly arranged at the two ends of the straight gear with the shaft; according to the utility model, the stepping motor I is started at the beginning of an experiment, and the stepping motor I drives the explosion-proof plate to move downwards to close the ventilation cabinet; then an electric push rod and a second stepping motor are started, when the electric push rod is started, the anti-explosion cover is driven to move downwards in the ventilation cabinet to cover the experiment device, when the second stepping motor is started, the fan is driven to rotate, and therefore chemical waste gas in the anti-explosion cover is exhausted, and when the fan is corroded, a buckle plate is opened with hands, and then a cover plate is taken out of an exhaust cylinder; and then the fan can be replaced by screwing out the limiting cover, so that the device is relatively convenient to replace the fan.

Description

Technical Field

[0001] This utility model relates to the field of fume hood air guiding, and in particular to an air guiding mechanism for laboratory fume hoods. Background Technology

[0002] A laboratory fume hood is a device used for exhaust ventilation in a laboratory. Also known as a fume hood, it is one of the most common pieces of equipment in a laboratory. Its most important function is exhaust ventilation. In a chemical laboratory, various harmful gases, odors, moisture, as well as flammable, explosive, and corrosive substances are generated during experimental operations. In order to protect the safety of users and prevent pollutants from spreading into the laboratory, fume hoods should be used near the source of pollution.

[0003] In existing technologies, the exhaust mechanism in laboratory fume hoods mostly uses fans for exhaust. During chemical experiments, highly corrosive gases are easily emitted. Conventional exhaust fans are easily corroded by chemical waste gases after long-term use, and the fan blades are mostly difficult to replace, making it inconvenient to replace the exhaust fan in existing laboratory fume hoods after the fan blades are corroded.

[0004] To address the aforementioned technical shortcomings, a solution is proposed. Utility Model Content

[0005] The purpose of this invention is to provide an air guiding mechanism for laboratory fume hoods to solve the aforementioned technical defects.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] An air guiding mechanism for a laboratory fume hood includes a fume hood, an explosion-proof plate slidably connected inside the fume hood, a stepper motor fixedly installed inside the fume hood by bolts, a rotatably connected spur gear with a shaft inside the fume hood, rollers fixedly installed at both ends of the spur gear, and an air guiding explosion-proof mechanism above the fume hood. The air guiding explosion-proof mechanism includes an exhaust pipe, an embedded tube slidably connected inside the exhaust pipe, and an explosion-proof cover fixedly connected below the embedded tube.

[0008] Preferably, the fume hood has symmetrically distributed cabinet doors on one side of its lower side. The cabinet doors are rotatably connected to the fume hood via hinges. The fume hood has an installation groove on its upper side. A spur gear is fixedly installed at the end of the drive shaft of the stepper motor.

[0009] Preferably, the gear inside the spur gear with shaft meshes with spur gear one, and spur gear two is fixedly connected to the outer side of the shaft at the other end of roller one. A spur gear three meshes with one side of spur gear two, and roller two is fixedly connected to one side of spur gear three. Roller two is rotatably connected to fume hood.

[0010] Preferably, the exhaust pipe is located inside the mounting groove and is fixedly connected to the fume hood, and an extension plate is fixedly connected to one side of the embedded tube. The explosion-proof cover, the embedded tube and the interior of the exhaust pipe are in communication.

[0011] An electric push rod is fixedly installed on the top of the fume hood by bolts. The drive shaft of the electric push rod passes through the fume hood and is fixedly connected to a coupling. An extension shaft is fixedly connected below the coupling, and the lower end of the extension shaft is fixedly connected to an extension plate.

[0012] Preferably, the exhaust pipe is further provided with a cover plate inside, and both ends of the cover plate are provided with fixedly connected buckles. The cover plate is provided with a fixedly connected housing inside, and a stepper motor II is fixedly installed on one side of the upper end of the housing by bolts. The drive shaft of the stepper motor II extends into the housing and is fixedly provided with a synchronous pulley I.

[0013] Preferably, a second synchronous wheel is provided rotatably connected to the lower part of the housing. A synchronous belt is fitted on the outer side of the first synchronous wheel and the second synchronous wheel. A connecting shaft is fixedly connected inside the second synchronous wheel. One end of the connecting shaft extends out of the housing and is threaded. A fan is slidably connected to the outer side of the connecting shaft. A limiting cover is also provided at one end of the connecting shaft. The limiting cover is threadedly connected to the connecting shaft.

[0014] The beneficial effects of this utility model are as follows:

[0015] This invention places the experimental apparatus inside a fume hood. When the experiment begins, stepper motor one is activated, which moves the explosion-proof plate downward to close the fume hood. Then, an electric push rod and stepper motor two are activated. When the electric push rod is activated, it moves the explosion-proof cover downward inside the fume hood to cover the experimental apparatus. When stepper motor two is activated, it drives the fan to rotate, thereby expelling the chemical waste gas inside the explosion-proof cover. When the fan becomes corroded, the cover plate can be pried open by hand and removed from the exhaust pipe. Then, the limiting cap can be unscrewed to replace the fan, making the fan replacement of this device relatively simple. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings;

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2This is a schematic diagram of the connection structure between the fume hood and the explosion-proof plate in this utility model;

[0019] Figure 3 This is a schematic diagram of the connection structure between the stepper motor and the explosion-proof plate in this utility model;

[0020] Figure 4 This is a schematic diagram of the overall structure of the air-guiding explosion-proof mechanism in this utility model;

[0021] Figure 5 This is a schematic diagram of the connection structure between the stepper motor and the fan in this utility model.

[0022] Legend: 1. Fume hood; 11. Cabinet door; 12. Explosion-proof plate; 13. Mounting groove; 14. Stepper motor one; 15. Spur gear one; 16. Spur gear with shaft; 17. Roller one; 18. Spur gear two; 19. Spur gear three; 20. Roller two; 3. Air guide explosion-proof mechanism; 31. Exhaust pipe; 32. Embedded tube; 33. Explosion-proof cover; 34. Extension plate; 35. Electric push rod; 36. Coupling; 37. Extension shaft; 38. Cover plate; 39. Buckle plate; 40. Housing; 41. Stepper motor two; 42. Connecting shaft; 43. Fan; 44. Limit cover. 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. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1 - Figure 5 As shown, this utility model is an air guiding mechanism for a laboratory fume hood, including a fume hood 1. The fume hood 1 has symmetrically distributed cabinet doors 11 on one side of its lower side. The cabinet doors 11 are rotatably connected to the fume hood 1 via hinges. The interior of the fume hood 1 has a slidingly connected explosion-proof plate 12. The top of the fume hood 1 has an installation groove 13. The interior of the fume hood 1 is also fixedly installed with a stepper motor 14 by bolts. The drive shaft of the stepper motor 14 is fixedly provided with a spur gear 15.

[0025] The fume hood 1 is also equipped with a rotatably connected spur gear 16 with a shaft. The gear inside the spur gear 16 meshes with a spur gear 15. Rollers 17 are fixedly installed at both ends of the spur gear 16. Spur gears 28 are fixedly connected to the outer side of the shaft at the other end of roller 17. A spur gear 39 is meshed on one side of spur gear 28. A roller 20 is fixedly connected to one side of spur gear 319. Rollers 220 are rotatably connected to fume hood 1.

[0026] When stepper motor 14 starts, it drives spur gear 15 to rotate. Spur gear 15 drives shafted spur gear 16 to rotate. Shafted spur gear 16 drives two rollers 17 to rotate synchronously with spur gear 28. Spur gear 28 drives roller 20 to rotate in the same direction at the same speed through spur gear 319, thereby causing the explosion-proof plate 12 between rollers 17 and 20 to move up or down.

[0027] The fume hood 1 is also provided with an air guiding explosion-proof mechanism 3 above it. The air guiding explosion-proof mechanism 3 includes an exhaust pipe 31. The exhaust pipe 31 is located inside the mounting groove 13 and is fixedly connected to the fume hood 1. The exhaust pipe 31 is embedded with a slidingly connected inner tube 32. The inner tube 32 is provided with a fixedly connected explosion-proof cover 33 below it. An extension plate 34 is also provided on one side of the inner tube 32.

[0028] The explosion-proof cover 33, the inner tube 32 and the exhaust pipe 31 are internally connected. An electric push rod 35 is fixedly installed on the top of the fume hood 1 by bolts. The drive shaft of the electric push rod 35 passes through the fume hood 1 and is fixedly provided with a coupling 36. An extension shaft 37 is fixedly connected below the coupling 36. The lower end of the extension shaft 37 is fixedly connected to the extension plate 34. When the electric push rod 35 is started, it drives the extension plate 34 to move up and down, thereby driving the explosion-proof cover 33 to move up and down inside the fume hood 1.

[0029] The exhaust pipe 31 is also provided with a cover plate 38 inside. Both ends of the cover plate 38 are provided with fixedly connected buckles 39. The buckles 39 are used to clip the cover plate 38 to the outside of the exhaust pipe 31. The cover plate 38 is provided with a fixedly connected housing 40 inside. A stepper motor 41 is fixedly installed on one side of the upper end of the housing 40 by bolts. The drive shaft of the stepper motor 41 extends into the housing 40 and is fixedly provided with a synchronous pulley.

[0030] The lower part of the housing 40 is also provided with a rotatably connected synchronous pulley 2. Synchronous belts are sleeved on the outer sides of synchronous pulley 1 and synchronous pulley 2. The inner part of synchronous pulley 2 is provided with a fixedly connected connecting shaft 42. One end of the connecting shaft 42 extends out of the housing 40 and is threaded. A fan 43 is slidably connected on the outer side of the connecting shaft 42. One end of the connecting shaft 42 is also provided with a limiting cover 44, which is threadedly connected to the connecting shaft 42.

[0031] The working process and principle of this utility model are as follows:

[0032] In use, the experimental apparatus is first placed inside the fume hood 1, and then the experiment is started. At the same time, stepper motor 14 is started. When stepper motor 14 starts, it drives spur gear 15 to rotate. Spur gear 15 drives shafted spur gear 16 to rotate. Shafted spur gear 16 drives two rollers 17 to rotate synchronously with spur gear 28. Spur gear 28 drives roller 20 to rotate in the same direction at the same speed through spur gear 319, thereby driving the explosion-proof plate 12 between rollers 17 and roller 20 to move downward and close the fume hood 1.

[0033] Then, the electric push rod 35 and the second stepper motor 41 are started. When the electric push rod 35 is started, it drives the extension plate 34 to move downward, which in turn drives the explosion-proof cover 33 to move downward in the fume hood 1 to cover the experimental device. When the second stepper motor 41 is started, it drives the connecting shaft 42 to rotate through the first synchronous pulley, the synchronous belt and the second synchronous pulley. The connecting shaft 42 drives the fan 43 on its outside to rotate, thereby expelling the chemical waste gas in the explosion-proof cover 33. When the fan 43 is corroded, the cover plate 38 can be taken out from the exhaust pipe 31 by prying open the buckle plate 39 by hand. Then, the limit cover 44 can be unscrewed to replace the fan 43, making the replacement of the fan 43 in this device relatively simple.

[0034] In the description of this specification, references to terms such as "an embodiment," "example," and "specific example" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0035] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A wind guide for a laboratory fume hood, comprising a fume hood (1), characterized in that, The inside of the fume hood (1) is provided with a slidingly connected explosion-proof plate (12), the inside of the fume hood (1) is further provided with a bolt-fixedly installed stepping motor (14), the inside of the fume hood (1) is further provided with a rotationally connected shaft straight gear (16), both ends of the shaft straight gear (16) are fixedly provided with roller (17), the upper side of the fume hood (1) is further provided with a wind-guiding explosion-proof mechanism (3), the wind-guiding explosion-proof mechanism (3) comprises an exhaust cylinder (31), the inside of the exhaust cylinder (31) is embedded with a slidingly connected embedded pipe (32), the lower side of the embedded pipe (32) is provided with a fixedly connected explosion-proof cover (33).

2. A baffle for a laboratory fume hood according to claim 1, wherein, The lower side of the fume hood (1) is provided with symmetrically distributed cabinet doors (11), the cabinet doors (11) are rotationally connected with the fume hood (1) through hinges, the upper side of the fume hood (1) is provided with an installation groove (13), the driving shaft end of the stepping motor (14) is fixedly provided with a straight gear (15).

3. A baffle for a laboratory fume hood according to claim 1, wherein, The gear in the shaft straight gear (16) is engaged with the straight gear (15), the outer side of the shaft of the other end of the roller (17) is provided with a fixedly connected straight gear (18), one side of the straight gear (18) is provided with an engaged straight gear (19), one side of the straight gear (19) is provided with a fixedly connected roller (20), the roller (20) is rotationally connected with the fume hood (1).

4. The air guiding device for a laboratory fume hood according to claim 1, wherein The exhaust cylinder (31) is located in the inside of the installation groove (13) and is fixedly connected with the fume hood (1), one side of the embedded pipe (32) is further provided with a fixedly connected extension plate (34), the inside of the explosion-proof cover (33), the embedded pipe (32) and the exhaust cylinder (31) are in communication; The upper side of the fume hood (1) is provided with a bolt-fixedly installed electric push rod (35), the driving shaft of the electric push rod (35) is fixedly provided with a shaft coupling (36) after penetrating through the fume hood (1), the lower side of the shaft coupling (36) is provided with a fixedly connected extension shaft (37), the lower end of the extension shaft (37) is fixedly connected with the extension plate (34).

5. A baffle for a laboratory fume hood according to claim 1, wherein, The inside of the exhaust cylinder (31) is further provided with a cover plate (38), both ends of the cover plate (38) are provided with fixedly connected buckle plates (39), the inside of the cover plate (38) is provided with a fixedly connected shell (40), one side of the upper end of the shell (40) is provided with a bolt-fixedly installed stepping motor (41), the driving shaft of the stepping motor (41) is fixedly provided with a synchronous pulley (42) after penetrating into the shell (40).

6. A baffle for a laboratory fume hood according to claim 5, wherein, The inside of the shell (40) is further provided with a rotationally connected synchronous pulley (42), the outer side of the synchronous pulley (42) is sleeved with a synchronous belt, the inside of the synchronous pulley (42) is provided with a fixedly connected connecting shaft (42), one end of the connecting shaft (42) is provided with a screw thread after penetrating out of the shell (40), the outer side of the connecting shaft (42) is provided with a slidingly connected fan (43), one end of the connecting shaft (42) is further provided with a limiting cover (44), the limiting cover (44) is threadedly connected with the connecting shaft (42).

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