Laboratory fume hood air volume control device

Abstract

The utility model discloses a laboratory fume hood air volume control device which comprises an installation base, a plurality of ventilation grooves are formed in the top end of a base plate at equal intervals, a plurality of rotating shafts are arranged on one side of the installation base at equal intervals in a penetrating mode, the outer wall of each rotating shaft is sleeved with a blocking piece, and a first gear is fixedly arranged at one end of each rotating shaft. A supporting strip is fixedly arranged on one side of the mounting base, and a rack is slidably arranged on the inner wall of the sliding groove. A servo motor is started to drive a second gear to rotate, a meshing rack slides left and right in a sliding groove in the upper end of a supporting strip, the rack is meshed with a plurality of first gears to rotate left and right while sliding left and right, the first gears drive blocking pieces to rotate in ventilation grooves through rotating shafts, and when the blocking pieces and the ventilation grooves are perpendicular to each other and form 90 degrees, the blocking pieces are meshed with the first gears to rotate left and right. The air quantity control device is simple in structure, convenient to operate and high in air quantity control accuracy, and the use convenience of the device is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of laboratory fume hoods, in particular to an air volume control device for laboratory fume hoods. Background Art

[0002] The most important function of the fume hood is the exhaust function. In chemical laboratories, various harmful gases, odors, moisture, and flammable, explosive, and corrosive substances are generated during experimental operations. In order to protect the safety of users and prevent the spread of pollutants in the experiment to the laboratory, fume hoods should be used near the pollution source. In order to improve the ventilation effect of the fume hood, it is necessary not only to increase its ventilation volume, but also to control its ventilation volume so that the fume hood can control different air intake volumes when dealing with different experiments, so as to achieve the best experimental effect.

[0003] In view of this, Chinese Patent No. CN107781951A proposes a laboratory air volume control device. The present invention realizes real-time frequency conversion adjustment of the exhaust cabinet door surface wind speed, eliminates the influence of door height changes and external airflow disturbances on the exhaust cabinet door surface wind speed, saves energy significantly, and has higher safety. However, the above technical scheme and the existing fume hood air volume control device are designed with a complex structure at the upper end and cumbersome operation. The operation is not convenient enough during precision experiments. At the same time, the effect of changing the air volume in the fume hood is not obvious, and the air volume is difficult to control subjectively. Therefore, a kind of air volume control structure is needed. Utility Model Content

[0004] In order to solve the above problems, the purpose of the utility model is to provide an air volume control device for a laboratory fume hood to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model proposes an air volume control device for a laboratory fume hood, comprising a mounting base, an upper end of which is provided with an air volume control mechanism;

[0006] The air volume control mechanism includes a pad fixed to the inner wall of the mounting base, a plurality of ventilation slots are equidistantly provided at the top of the pad, a plurality of rotating shafts are equidistantly provided on one side of the mounting base, and the outer wall of each rotating shaft is respectively connected with the inner wall of each ventilation slot, a baffle is sleeved on the outer wall of each rotating shaft, a first gear is fixedly provided at one end of each rotating shaft, a support bar is fixedly provided on one side of the mounting base, a slide groove is provided at the top of the support bar, a rack is slidably provided on the inner wall of the slide groove, and the outer wall of the rack is respectively meshed with the outer wall of each first gear.

[0007] In one example, a second gear is rotatably provided on one side of the mounting base, and the outer wall of the second gear is meshed with the outer wall of the rack, a servo motor is fixedly provided on one side of the outer wall of the support bar, and one end of the second gear is fixedly connected to the output end of the servo motor.

[0008] In one example, a guide groove is fixedly provided on the top of the mounting base, and a sealing gasket is fixedly provided on the edge of one side of the guide groove.

[0009] In one example, a docking groove is interspersed in the middle position of one side of the guide groove, and mounting holes are opened at both ends of one side of the inner wall of the docking groove, and the inner walls of the two mounting holes are respectively connected to the inner wall of the guide groove.

[0010] In one example, fans are provided on the inner walls of the two mounting holes, and a dustproof net is fixedly provided on the edge of one side of the inner wall of the docking groove.

[0011] In one example, a switch panel is fixedly provided on one side of the mounting base, and the servo motor and the fan are electrically connected to an external power supply through the switch panel.

[0012] The laboratory fume hood air volume control device proposed by the utility model can bring the following beneficial effects:

[0013] 1. This kind of laboratory fume hood air volume control device, according to experimental needs, starts the servo motor to drive the second gear to rotate, and then the meshing rack slides left and right in the slide groove at the upper end of the support bar. While the rack slides left and right, it will mesh with multiple first gears to rotate left and right. The first gear will rotate in the ventilation slot with the baffle through the rotating shaft. When the baffle is vertical to the ventilation slot at ninety degrees, the ventilation volume is maximum at this time. The baffle and the ventilation slot are in a horizontal state so that it blocks the ventilation slot to close the ventilation. This process is controlled by driving the servo motor, with a simple structure and convenient operation. At the same time, the air volume control is highly accurate, which improves the convenience of using the device.

[0014] 2. This kind of laboratory fume hood air volume control device can start the fan in the installation hole to rotate it to increase the ventilation volume during the ventilation process, so that the laboratory fume hood can quickly cool it down when conducting high-temperature experiments to prevent fires caused by high temperature. At the same time, toxic gases can be quickly discharged to ensure the safety inside the laboratory and improve the ventilation efficiency of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0016] Figure 1It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the structure inside the installation base of the utility model;

[0018] Figure 3 It is a schematic diagram of the overall structure of the air volume control mechanism of the utility model;

[0019] Figure 4 It is a schematic diagram of the structure inside the docking groove of the utility model.

[0020] In the figure: 1. Mounting base; 2. Pad; 3. Ventilation slot; 4. Rotating shaft; 5. Baffle; 6. First gear; 7. Support bar; 8. Slide slot; 9. Rack; 10. Second gear; 11. Servo motor; 12. Guide slot; 13. Sealing gasket; 14. Docking slot; 15. Mounting hole; 16. Fan; 17. Dust net. DETAILED DESCRIPTION

[0021] In order to more clearly illustrate the overall concept of the present invention, a detailed description is given below in the form of examples in conjunction with the accompanying drawings.

[0022] The examples are as follows:

[0023] The utility model provides Figure 1-4 A laboratory fume hood air volume control device shown includes a mounting base 1, and an air volume control mechanism is provided at the upper end of the mounting base 1;

[0024] The air volume control mechanism includes a pad 2 fixed on the inner wall of the mounting base 1, a plurality of ventilation slots 3 are equidistantly provided on the top of the pad 2, a plurality of rotating shafts 4 are equidistantly interspersed on one side of the mounting base 1, and the outer wall of each rotating shaft 4 is respectively interspersed and connected with the inner wall of each ventilation slot 3, a baffle 5 is sleeved on the outer wall of each rotating shaft 4, a first gear 6 is fixedly provided at one end of each rotating shaft 4, a support bar 7 is fixedly provided on one side of the mounting base 1, a slide groove 8 is provided on the top of the support bar 7, a rack 9 is slidably provided on the inner wall of the slide groove 8, and the outer wall of the rack 9 is respectively meshed with the outer wall of each first gear 6, and there are limit positions at both ends of the rack 9, so that it always keeps a disengaged state with the outermost first gear 6 and the second gear 10.

[0025] A second gear 10 is rotatably provided on one side of the mounting base 1, and the outer wall of the second gear 10 is meshed with the outer wall of the rack 9, a servo motor 11 is fixedly provided on one side of the outer wall of the support bar 7, and one end of the second gear 10 is fixedly connected to the output end of the servo motor 11, and the servo motor 11 can be controlled to start and stop and drive direction by a controller at the upper end of the laboratory fume hood, and when the baffle 5 rotates and is horizontal to the ventilation slot 3, its two sides just contact the two sides of the inner wall of the ventilation slot 3, blocking the ventilation device so that it is not ventilated;

[0026] Furthermore, a guide groove 12 is fixedly provided on the top of the mounting base 1, and a sealing gasket 13 is fixedly provided on the edge of one side of the guide groove 12. When the fume hood and the ventilation device are installed, the guide groove 12 at the upper end of the ventilation device will be connected to the docking groove 14, and the docking groove 14 will be connected to the wall of the laboratory to connect with the outside. When penetrating the wall, the sealing gasket 13 contacts the wall to seal it to prevent the risk of air leakage, which will cause the toxic gas to be unable to be discharged.

[0027] A switch panel is fixedly provided on one side of the mounting base 1, and the servo motor 11 and the fan 16 are electrically connected to an external power supply through the switch panel;

[0028] Furthermore, a docking groove 14 is interspersed in the middle of one side of the guide groove 12 , and mounting holes 15 are opened at both ends of one side of the inner wall of the docking groove 14 , and the inner walls of the two mounting holes 15 are respectively connected to the inner walls of the guide groove 12 .

[0029] The inner walls of the two mounting holes 15 are each provided with a fan 16, and a dustproof net 17 is fixedly provided at the edge of one side of the inner wall of the docking groove 14. When the fan 16 is not started, the area of ​​the mounting hole 15 is large enough to allow natural wind to enter and exit, thereby realizing ventilation of the fume hood, and the dustproof net 17 effectively prevents dust from entering the equipment, and also prevents birds from resting on the upper end thereof and affecting ventilation and heat dissipation.

[0030] Working principle: When using the laboratory fume hood air volume control device in this design, first, the guide groove 12 at the upper end of the device needs to be installed on the upper end of the mounting base 1, and then the mounting base 1 together with the entire device is installed on the top of the fume hood for use. When conducting experiments at the lower end of the fume hood, the door of the fume hood can be opened to guide ventilation through the guide groove 12 and the docking groove 14. According to the needs of the experiment, the servo motor 11 is started to drive the second gear 10 to rotate, and then the meshing rack 9 slides left and right in the slide groove 8 at the upper end of the support bar 7. While the rack 9 slides left and right, it will mesh with multiple first gears 6 to rotate left and right. The first gear 6 will carry the baffle 5 through the rotating shaft 4. When the baffle 5 rotates in the ventilation slot 3 and is perpendicular to the ventilation slot 3 at ninety degrees, the ventilation volume is maximum at this time. The baffle 5 and the ventilation slot 3 are in a horizontal state so that it blocks the ventilation slot 3 to close the ventilation. This process is controlled by driving the servo motor 11. The structure is simple and the operation is convenient. At the same time, the air volume control is highly accurate, which improves the convenience of using the device. During the ventilation process, the fan 16 in the mounting hole 15 can be started to rotate to increase the ventilation volume, so that the laboratory fume hood can quickly cool down the laboratory when conducting high-temperature experiments to prevent fires caused by high temperature. At the same time, toxic gases can be quickly discharged to ensure the safety inside the laboratory and improve the ventilation efficiency of the device.

[0031] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0032] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A laboratory fume hood air volume control device, comprising a mounting base (1), characterized in that: An air volume control mechanism is provided at the upper end of the mounting base (1); The air volume control mechanism comprises a pad (2) fixed on the inner wall of the mounting base (1), a plurality of ventilation slots (3) are equidistantly provided at the top of the pad (2), a plurality of rotating shafts (4) are equidistantly inserted on one side of the mounting base (1), and the outer wall of each rotating shaft (4) is respectively inserted and connected with the inner wall of each ventilation slot (3), a baffle (5) is sleeved on the outer wall of each rotating shaft (4), a first gear (6) is fixedly provided at one end of each rotating shaft (4), a support bar (7) is fixedly provided on one side of the mounting base (1), a slide groove (8) is provided at the top of the support bar (7), a rack (9) is slidably provided on the inner wall of the slide groove (8), and the outer wall of the rack (9) is respectively meshed with the outer wall of each first gear (6).

2. A laboratory fume hood air volume control device according to claim 1, characterized in that: A second gear (10) is rotatably provided on one side of the mounting base (1), and the outer wall of the second gear (10) is meshed with the outer wall of the rack (9); a servo motor (11) is fixedly provided on one side of the outer wall of the support bar (7), and one end of the second gear (10) is fixedly connected to the output end of the servo motor (11).

3. A laboratory fume hood air volume control device according to claim 1, characterized in that: A guide groove (12) is fixedly provided at the top end of the installation base (1), and a sealing gasket (13) is fixedly provided at the edge of one side of the guide groove (12).

4. A laboratory fume hood air volume control device according to claim 3, characterized in that: A docking groove (14) is interspersed in the middle of one side of the guide groove (12), and mounting holes (15) are provided at both ends of one side of the inner wall of the docking groove (14), and the inner walls of the two mounting holes (15) are respectively connected to the inner wall of the guide groove (12).

5. A laboratory fume hood air volume control device according to claim 4, characterized in that: The inner walls of the two mounting holes (15) are both provided with fans (16), and a dustproof net (17) is fixedly provided at the edge of one side of the inner wall of the docking groove (14).

6. A laboratory fume hood air volume control device according to claim 5, characterized in that: A switch panel is fixedly provided on one side of the mounting base (1), and the servo motor (11) and the fan (16) are electrically connected to an external power supply via the switch panel.

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