Laboratory ventilating duct with headwind prevention function

Abstract

The utility model relates to the field of laboratory ventilation pipelines, in particular to a laboratory ventilation pipeline with an anti-headwind function, and adopts the technical scheme that the laboratory ventilation pipeline with the anti-headwind function comprises an exhaust pipe inserted into a laboratory wall body, a ventilation elbow formed by combining a first ventilation pipe and a second ventilation pipe, and a wind shield, a first ventilation pipeline is arranged on the outer side of the exhaust pipe, a second ventilation pipe perpendicular to the ground is installed at the other end of the first ventilation pipeline, and a wind shield is arranged between the exhaust pipe and the ventilation pipe. An existing straight-through type ventilating pipeline of a laboratory is improved into the ventilating bent pipe formed by combining the first ventilating pipe and the second ventilating pipe, the air outlet of the second ventilating pipe is right opposite to the ground, external air flowing back into the ventilating pipeline can be effectively reduced when the external strong wind occurs, meanwhile, the wind shield can rotate, and therefore the ventilating pipeline is convenient to clean. The ventilating duct is closed to prevent external air from flowing back into the laboratory.

Description

Technical Field

[0001] The utility model belongs to the field of laboratory ventilation ducts, and particularly relates to a laboratory ventilation duct with an anti-backwind function. Background Technique

[0002] There are many chemical substances in the laboratory that continuously emit odors or even are toxic. During the experiment, these chemical substances will be exposed to the air. To ensure the safety of the experimenters, it is often necessary to install a ventilation system in the laboratory to ensure the normal circulation of air in the laboratory.

[0003] At present, the existing laboratory ventilation ducts often adopt straight-through ducts. The connection between the laboratory and the external environment is too large, and the external air easily forms a backwind through the ducts and pours back into the laboratory, resulting in the abnormal discharge of the odor or toxic gas in the laboratory and having an adverse impact on the staff.

[0004] Therefore, aiming at the problem that the existing laboratory ventilation ducts often adopt straight-through ducts and the external air easily forms a backwind through the ducts and pours back into the laboratory, the existing laboratory ventilation ducts are improved by changing them into 90-degree elbow pipes and installing wind baffle plates to avoid the backwind from the outside. Summary of the Utility Model

[0005] In order to overcome the problem that the existing laboratory ventilation ducts are often straight-through and the external air easily forms a backwind through the ducts and pours back into the laboratory.

[0006] The technical solution of the utility model is: a laboratory ventilation duct with an anti-backwind function, which includes an exhaust duct inserted into the laboratory wall, a ventilation elbow composed of a first ventilation pipe and a second ventilation pipe, and a wind baffle; a first ventilation duct is arranged outside the exhaust duct, the other end of the first ventilation duct is installed with a second ventilation pipe perpendicular to the ground, and a wind baffle is arranged between the exhaust duct and the ventilation pipe.

[0007] Preferably, by improving the existing straight-through laboratory ventilation duct into a ventilation elbow composed of a first ventilation pipe and a second ventilation pipe, and the air outlet of the second ventilation pipe faces the ground, it can effectively reduce the external wind pouring back into the ventilation duct when there is a strong external wind. At the same time, the wind baffle 4 can rotate to close the ventilation duct and avoid the external wind from pouring back into the laboratory.

[0008] As a preference, a variable air volume butterfly valve is installed in the first ventilation duct, and a flow sensor is installed in the first ventilation duct on the front side of the variable air volume butterfly valve. The variable air volume butterfly valve can change the wind speed of the duct by changing the opening of the valve body, and the flow sensor can measure the air volume passing through the first ventilation duct.

[0009] Preferably, one end of the first ventilation duct is equipped with a first mounting seat, and one end of the second ventilation duct is equipped with a second mounting seat. The first ventilation duct and the second ventilation duct are connected and fixed together through the first mounting seat and the second mounting seat, so that the air in the laboratory flows into the second ventilation duct along the first ventilation duct.

[0010] Preferably, the first mounting seat is provided with a jack, the second mounting seat is fixedly connected with a screw rod matching the jack, and a nut is screwed on the screw rod. By tightening the nut, one end of the nut abuts against the first mounting seat, realizing the fixation of the first mounting seat and the second mounting seat together.

[0011] Preferably, a wind blocking duct is installed between the exhaust duct and the first ventilation duct. The wind blocking duct is provided with wind baffle plates arranged at equal intervals from top to bottom. By installing the wind baffle plates between the exhaust duct and the first ventilation duct through the wind blocking duct, the flow channel between the exhaust duct and the first ventilation duct can be cut off, blocking the external adverse wind from flowing back into the laboratory through the first ventilation duct.

[0012] Preferably, adjacent two wind baffle plates are movably connected through a connecting rod. A rotating shaft is fixedly connected inside the wind blocking duct, and the connecting rod is movably sleeved outside the rotating shaft. By rotating the connecting rod on the rotating shaft, all the wind baffle plates are synchronously driven to rotate together, making the wind baffle plates in a vertical state to form a block and prevent the adverse wind from flowing back.

[0013] Preferably, the bottom end of the second ventilation duct is fixedly connected with a third mounting seat, and an exhaust fan is installed at the bottom end of the second ventilation duct. The exhaust fan is fixedly connected with a fourth mounting seat matching the third mounting seat. The third mounting seat and the fourth mounting seat are provided with anchoring holes, and bolts are inserted into the anchoring holes. By screwing the nuts, the exhaust fan can be fixed at the bottom end of the second ventilation duct. The exhaust fan can extract the air in the duct to form a negative pressure, sucking and discharging the gas in the laboratory.

[0014] The beneficial effects of the present utility model:

[0015] 1. By improving the existing straight-through ventilation duct in the laboratory into a ventilation elbow composed of a first ventilation duct and a second ventilation duct, and the air outlet of the second ventilation duct faces the ground, it can effectively reduce the external wind pouring back into the ventilation duct when there is a strong external wind. At the same time, the wind baffle plate 4 can rotate to close the ventilation duct to prevent the external wind from pouring back into the laboratory;

[0016] 2. The opening degree of the valve body of the variable air volume butterfly valve is constantly changing, and the wind speed passing through the duct will also change accordingly, which is equivalent to controlling the change of the air volume in the duct. Description of the drawings

[0017] Figure 1 Shown is the first three-dimensional structure schematic diagram of the laboratory ventilation duct with the anti-adverse wind function of the present utility model;

[0018] Figure 2 The second three-dimensional structure diagram of the laboratory ventilation duct with the anti-backwind function of the present utility model is shown;

[0019] Figure 3 The three-dimensional structure diagram of the first ventilation duct of the laboratory ventilation duct with the anti-backwind function of the present utility model is shown;

[0020] Figure 4 The three-dimensional structure diagram of the second ventilation duct of the laboratory ventilation duct with the anti-backwind function of the present utility model is shown;

[0021] Figure 5 The three-dimensional structure diagram of the wind-blocking duct and the rotating shaft of the laboratory ventilation duct with the anti-backwind function of the present utility model is shown;

[0022] Figure 6 The three-dimensional structure diagram of the wind-blocking plate and the connecting rod of the laboratory ventilation duct with the anti-backwind function of the present utility model is shown.

[0023] Explanation of reference numerals: 1, exhaust duct; 2, first ventilation duct; 3, second ventilation duct; 4, wind-blocking plate; 5, first mounting seat; 6, second mounting seat; 7, jack; 8, screw; 9, wind-blocking duct; 10, connecting rod; 11, rotating shaft; 12, third mounting seat; 13, exhaust fan; 14, fourth mounting seat. Detailed implementation manners

[0024] The present utility model will be further described below with reference to the accompanying drawings and embodiments.

[0025] Please refer to Figures 1 - 6 , the present utility model provides an embodiment: A laboratory ventilation duct with an anti-backwind function includes an exhaust duct 1 inserted into the laboratory wall, a ventilation elbow composed of a first ventilation duct 2 and a second ventilation duct 3, and a wind-blocking plate 4; A first ventilation duct 2 is arranged outside the exhaust duct 1, and the other end of the first ventilation duct 2 is installed with a second ventilation duct 3 perpendicular to the ground. A wind-blocking plate 4 is arranged between the exhaust duct 1 and the ventilation duct. By improving the existing straight-through laboratory ventilation duct into a ventilation elbow composed of a first ventilation duct 2 and a second ventilation duct 3, the air outlet of the second ventilation duct 3 faces the ground, which can effectively reduce the external wind pouring back into the ventilation duct when there is a strong external wind. At the same time, the wind-blocking plate 4 can rotate to close the ventilation duct to prevent the external wind from pouring back into the laboratory.

[0026] Please refer to Figures 1 - 4, in this embodiment, a variable air volume butterfly valve is installed in the first ventilation pipe 2, a flow sensor is installed in the first ventilation pipe 2 and is located on the front side of the variable air volume butterfly valve, one end of the first ventilation pipe 2 is provided with a first mounting seat 5, one end of the second ventilation pipe 3 is provided with a second mounting seat 6, a jack 7 is opened on the first mounting seat 5, a screw rod 8 matching the jack 7 is fixedly connected to the second mounting seat 6, and a nut is screwed on the screw rod 8. The variable air volume butterfly valve can change the wind speed of the pipeline by changing the opening degree of the valve body. The flow sensor can measure the air volume passing through the first ventilation pipe 2. The first ventilation pipe 2 and the second ventilation pipe 3 are connected and fixed together through the first mounting seat 5 and the second mounting seat 6, so that the air in the laboratory flows into the second ventilation pipe 3 along the first ventilation pipe 2. Tighten the nut so that one end of the nut is closely attached to the first mounting seat 5 to fix the first mounting seat 5 and the second mounting seat 6 together.

[0027] Please refer to Figures 4 - 6 , in this embodiment, a wind blocking pipe 9 is installed between the exhaust pipe 1 and the first ventilation pipe 2. Wind baffle plates 4 are arranged at equal intervals from top to bottom in the wind blocking pipe 9. Adjacent two wind baffle plates 4 are movably connected through a connecting rod 10. A rotating shaft 11 is fixedly connected in the wind blocking pipe 9. The connecting rod 10 is movably sleeved outside the rotating shaft 11. The bottom end of the second ventilation pipe 3 is fixedly connected with a third mounting seat 12. An exhaust fan 13 is installed at the bottom end of the second ventilation pipe 3. A fourth mounting seat 14 matching the third mounting seat 12 is fixedly connected to the exhaust fan 13. By installing the wind baffle plates 4 between the exhaust pipe and the first ventilation pipe 2 through the wind blocking pipe 9, the flow channel between the exhaust pipe 1 and the first ventilation pipe 2 can be cut off, and the external reverse wind can be blocked from flowing back into the laboratory through the first ventilation pipe 2. By rotating the connecting rod 10 on the rotating shaft 11, all the wind baffle plates 4 can be synchronously driven to rotate together, so that the wind baffle plates 4 are in a vertical state to form a block and prevent the reverse wind from flowing back. Anchor holes are opened on the third mounting seat 12 and the fourth mounting seat 14. Bolts are inserted into the anchor holes. Screwing the nuts can fix the exhaust fan 13 at the bottom end of the second ventilation pipe 3. The exhaust fan 13 can extract the air in the pipeline to form a negative pressure, suck and discharge the gas in the laboratory.

[0028] When working, first, the staff installs the wind blocking pipe 9 behind the exhaust pipe 1, then installs the first ventilation pipe 2 behind the wind blocking pipe 9, then installs the variable air volume butterfly valve and the flow sensor in the first ventilation pipe 2, then takes out the fan, aligns the fourth mounting seat 14 with the third mounting seat 12 and installs the fan at the bottom end of the second ventilation pipe 3, then aligns the screw rod 8 with the jack 7 and inserts it into the jack 7 so that the first mounting seat 5 and the second mounting seat 6 are closely attached, and tightens the nut on the screw rod 8 to play a fixing role;

[0029] After the overall components are properly assembled, it is necessary to test and set the air volume value between 150 and 750 Pa of wind pressure. Through the calculation of the PCB circuit board, a specified output signal is given to the DC24V actuator to act, and the air volume deviation is within the error range of 5%. The calculation logic is to first measure the wind speed in the pipeline. Through the preset pipeline cross-sectional size, different air volumes represented by different wind speeds can be calculated. At the same time, within the pipeline pressure range, the signal output by the PCB circuit board is given to the DC24V actuator to act. The opening of the valve body is constantly changing, and the wind speed passing through the pipeline will also change accordingly, which is equivalent to controlling the change of the air volume in the pipeline;

[0030] When there is a strong wind outside, since the second ventilation pipe 3 is perpendicular to the ground, it can effectively reduce the headwind pouring into the second ventilation pipe 3. When the headwind and the exhaust wind collide in the baffle pipe 9, it drives the connecting rod 10 to rotate and deform, pulling the windshield 4 to rotate, so as to close the air duct and prevent the headwind from pouring back into the laboratory.

[0031] Through the above steps, the existing direct-through ventilation pipeline in the laboratory is improved into a ventilation elbow composed of the first ventilation pipe 2 and the second ventilation pipe 3. The air outlet of the second ventilation pipe 3 faces the ground, which can effectively reduce the external wind pouring into the ventilation pipeline when there is a strong wind outside. At the same time, the windshield 4 can rotate to close the ventilation pipeline to prevent the external wind from pouring back into the laboratory, so as to solve the problem that the existing laboratory ventilation pipeline is often direct-through, and the external air easily forms a headwind and pours back into the laboratory through the pipeline.

[0032] The above has described the embodiments of the present invention in detail with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the gist of the present invention.

Claims

1. A laboratory ventilation duct with an anti-headwind function, comprising an exhaust duct (1) inserted into the laboratory wall; characterized in that, It also includes a ventilation elbow formed by combining a first ventilation pipe (2) and a second ventilation pipe (3), and a wind baffle (4); a first ventilation pipe (2) is arranged outside the exhaust pipe (1), the other end of the first ventilation pipe (2) is installed with a second ventilation pipe (3) perpendicular to the ground, and a wind baffle (4) is arranged between the exhaust pipe (1) and the ventilation pipe.

2. The laboratory ventilation duct with an anti-headwind function according to claim 1, characterized in that, A variable air volume butterfly valve is installed in the first ventilation pipe (2), and a flow sensor is installed in the first ventilation pipe (2) on the front side of the variable air volume butterfly valve.

3. The laboratory ventilation duct with anti-headwind function according to claim 2, characterized in that, A first mounting seat (5) is installed at one end of the first ventilation pipe (2), and a second mounting seat (6) is installed at one end of the second ventilation pipe (3).

4. The laboratory ventilation duct with an anti-headwind function according to claim 3, characterized in that, A jack (7) is formed on the first mounting seat (5), a screw rod (8) matching the jack (7) is fixedly connected to the second mounting seat (6), and a nut is screwed on the screw rod (8).

5. The laboratory ventilation duct with anti-headwind function according to claim 4, characterized in that, A wind blocking pipe (9) is installed between the exhaust pipe (1) and the first ventilation pipe (2), and wind baffles (4) are arranged at equal intervals from top to bottom in the wind blocking pipe (9).

6. The laboratory ventilation duct with an anti-headwind function according to claim 5, characterized in that, Adjacent two wind baffles (4) are movably connected by a connecting rod (10), a rotating shaft (11) is fixedly connected in the wind blocking pipe (9), and the connecting rod (10) is movably sleeved outside the rotating shaft (11).

7. The laboratory ventilation duct with the anti-headwind function according to claim 6, characterized in that, A third mounting seat (12) is fixedly connected to the bottom end of the second ventilation pipe (3), a suction fan (13) is installed at the bottom end of the second ventilation pipe (3), and a fourth mounting seat (14) matching the third mounting seat (12) is fixedly connected to the suction fan (13).

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