CN211084346U - Air return type laboratory fume chamber - Google Patents
Air return type laboratory fume chamber Download PDFInfo
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- CN211084346U CN211084346U CN201922076470.7U CN201922076470U CN211084346U CN 211084346 U CN211084346 U CN 211084346U CN 201922076470 U CN201922076470 U CN 201922076470U CN 211084346 U CN211084346 U CN 211084346U
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- air inlet
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Abstract
The utility model discloses a return air type laboratory fume hood, which comprises a fume hood body, wherein the middle part of the fume hood body is provided with an operating room, and an air outlet is arranged above the operating room; the operation chamber comprises an operation table, an air inlet is formed in the edge of one side, close to the cabinet door, of the operation table, and the air inlet faces the upper portion of the rear wall of the operation chamber; the air inlet is in a narrow and long outward expansion shape and is rotatably connected with the air inlet pipeline; one side of the cabinet door is connected with a rack, a gear device matched with the rack is arranged in the cabinet wall, and the gear device is in transmission connection with a rotating shaft of the air inlet; the cabinet door rises, and the rack is used for increasing the inclination angle of the air inlet and the horizontal direction. The utility model discloses be provided with independent air intake and realize the internal portion air current circulation of cabinet, and the angle of air intake with along with the lift adjustment of cabinet door, can prevent the internal and external air current exchange of cabinet more effectively.
Description
Technical Field
The utility model relates to a laboratory paraphernalia field especially relates to an air return type laboratory fume chamber.
Background
When the physical and chemical experiment is carried out, harmful gases are often generated to cause damage to human bodies, so that the ventilation cabinet is used as an experiment platform to reduce the harm of the harmful gases to the human bodies. The fume hood, also called fume hood, is a basic equipment in the laboratory. General fume chamber only has the air exit, and this kind of fume chamber can constantly extract indoor gas at the during operation, when indoor simultaneous use air conditioner or heating installation, can lead to indoor air conditioning or heating installation to run off in a large number, is unfavorable for controlling indoor temperature.
The fume chamber is at the in-process of using, and the opening size of cabinet door can influence the exchange condition of inside and outside air current, how to make corresponding adjustment according to the opening size of cabinet door, further prevents that the harmful gas in the fume chamber from diffusing to the external world, also is worth the technical field who explores.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome exist not enough among the prior art, the utility model provides a return air type laboratory fume chamber is provided with independent air intake and realizes the internal portion air current circulation of cabinet, and the angle of air intake with along with the lift adjustment of cabinet door, can prevent the internal and external air current exchange of cabinet more effectively.
The technical scheme is as follows: in order to achieve the purpose, the air return type laboratory ventilation cabinet comprises a ventilation cabinet body, wherein an operation chamber is arranged in the middle of the ventilation cabinet body, and an air outlet is formed above the operation chamber; the operation chamber comprises an operation table, an air inlet is formed in the edge of one side, close to the cabinet door, of the operation table, and the air inlet faces the upper portion of the rear wall of the operation chamber; the air inlet is in a narrow and long outward expansion shape and is rotatably connected with the air inlet pipeline; one side of the cabinet door is connected with a rack, a gear device matched with the rack is arranged in the cabinet wall, and the gear device is in transmission connection with a rotating shaft of the air inlet; the cabinet door rises, and the rack is used for increasing the inclination angle of the air inlet and the horizontal direction.
Furthermore, the gear device comprises a primary motion gear, a transmission helical gear and a transmission belt, and one end of the air inlet rotating shaft is connected with the reception helical gear; the primary gear is positioned inside the cabinet wall and meshed with the rack, and a rotating shaft of the primary gear is vertical to the cabinet door; the primary motion gear is in transmission connection with the transmission bevel gear through the transmission belt, and the transmission bevel gear is meshed with the driven bevel gear.
Furthermore, a plurality of air duct plates are arranged on the rear cabinet wall in the operation chamber opposite to the cabinet door, and the air duct plates are spaced from the rear cabinet wall to form an air exhaust channel; the length direction of wind channel board is mutually perpendicular with vertical direction, and is a plurality of the vertical interval of wind channel board is arranged, and from top to bottom interval reduces gradually.
Furthermore, the air duct plate is arranged in a rotating manner, and a rotating shaft of the air duct plate is in transmission connection with the gear device; the cabinet door rises to cause the upper ends of the air duct plates to incline outwards.
Furthermore, a second gear is arranged on a rotating shaft of the primary gear, and the second gear is meshed with the vertical worm; the rotating shafts of the air duct plates are connected with driven gears, and the driven gears are meshed with the worms; from top to bottom, it is a plurality of driven gear's number of teeth increases gradually.
Furthermore, the top of the operation chamber is provided with an arc surface, the curvature of the arc surface at the top tends to increase gradually from the inner side to the outer side of the operation chamber, and the outermost side of the arc surface at the top of the operation chamber is tangent to the vertical direction.
Has the advantages that: the utility model discloses a return air type laboratory fume chamber, the operating room in the middle part of which is provided with an air inlet, so that the internal airflow circulation is realized in the chamber body, and the control of the temperature in the laboratory is facilitated; the air inlet is in a long and narrow outward expansion shape, the inclination angle of the air inlet and the horizontal direction is increased along with the rising of the cabinet door, the angle of the air curtain is adjusted to further prevent the exchange of internal and external air flows, and harmful gas is prevented from being diffused to the outside; the rear wall of the cabinet body is provided with an air duct plate, the air duct plate can enable the whole air flow to flow from the outer side to the inner side of the operation chamber, and the distance between adjacent air duct plates is gradually reduced from top to bottom and is adaptive to the air flow; along with the ascending of the cabinet door, the upper end of the air duct plate inclines outwards and is matched with the air inlet with the increased inclination angle to generate circulating airflow; the top of the operation chamber is provided with a cambered surface, which is beneficial to generating circulating airflow.
Drawings
FIG. 1 is a schematic view of the entire fume hood;
fig. 2 is a schematic view of a gear arrangement.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
The air return type laboratory ventilation cabinet shown in the attached drawings 1 to 2 comprises a ventilation cabinet body 1, wherein an operation chamber 2 is arranged in the middle of the ventilation cabinet body 1, and an air outlet 3 is arranged above the operation chamber 2; the operation chamber 2 comprises an operation table 4, an air inlet 6 is arranged at the edge of one side of the operation table 4 close to a cabinet door 5, and the air inlet 6 faces the upper part of the rear wall of the operation chamber 2; the air inlet 6 is in a narrow and long outward expansion shape, the air opening faces the inner side of the operation chamber 2, the width of the narrow and long air inlet 6 is the same as that of the operation table 4, the air inlet 6 in the outward expansion shape enables air to enter from the air inlet 6 and then diffuse, an air curtain is formed to inhibit the exchange of air flow inside and outside the ventilation cabinet body 1, and the air inlet 6 is rotatably connected with an air inlet pipeline; one side of the cabinet door 5 is connected with a rack 7, the rack 7 is driven to lift when the cabinet door 5 lifts, a gear device 8 matched with the rack 7 is arranged in the cabinet wall, and the gear device 8 is in transmission connection with a rotating shaft of the air inlet 6; the cabinet door 5 rises, and 5 openings of cabinet door increase, cabinet door 5 passes through rack 7 causes the inclination increase of air intake 6 and horizontal direction, the air curtain that the air intake 6 produced more is inclined to vertical direction, and the air curtain restraines the inside and outside gas exchange that causes because of the increase of 2 openings of cabinet door better, prevents that harmful gas from endangering the human body.
The gear device 8 comprises a primary motion gear 801, a transmission bevel gear 802 and a transmission belt 803, and one end of the rotating shaft of the air inlet 6 is connected with the transmission bevel gear 804; the primary gear 801 is positioned inside the cabinet wall, the primary gear 801 is meshed with the rack 7, and a rotating shaft of the primary gear 801 is vertical to the cabinet door 5; the initial motion gear 801 is in transmission connection with the transmission bevel gear 802 through the transmission belt 803, and the transmission bevel gear 802 is meshed with the driven bevel gear 804; the cabinet door 5 ascends to drive the rack 7 to ascend, and the rack 7 drives the air inlet 6 to horizontally rotate upwards by means of the transmission of the initial motion gear 801, the transmission belt 803, the transmission helical gear 802 and the driven helical gear 804 in sequence.
A plurality of air duct plates 9 are arranged on the rear cabinet wall opposite to the cabinet door 5 in the operation chamber 2, the surface of each air duct plate 9 is opposite to the rear cabinet wall, the air duct plates 9 and the rear cabinet wall are separated at intervals to form an air exhaust channel, and the air exhaust channel is connected with an air outlet positioned above the ventilation cabinet; the length direction of the air duct plates 9 is vertical to the vertical direction, a plurality of air duct plates 9 are arranged at a vertical interval, a side air duct opening is formed between every two adjacent air duct plates, the arrangement of the side air duct opening can better enable the gas in the operation chamber 2 to integrally flow and circulate, if the air duct plates 9 are not arranged, the direction of the air flow in the operation chamber 2 is directly from the air inlet 6 to the air outlet 3, and the air flow covering the whole operation chamber 2 cannot be formed; the distance between the adjacent air duct plates 9 is gradually reduced from top to bottom, namely the size of the crosswind duct opening is gradually reduced from top to bottom; the air enters from the air inlet 6, then upwards reaches the top of the operation chamber 2, and then downwards moves from the top of the operation chamber 2, the air flow is reduced in the process, the speed is reduced, and the size of the cross air duct opening is gradually reduced from top to bottom, so that the air flow can be more effectively distributed to enter the air exhaust channel.
The air duct plate 9 is rotatably arranged, the air duct plate 9 is erected in the operation chamber 2 through a rotating shaft, the rotating shaft of the air duct plate 9 is parallel to the plane where the cabinet door 5 is located, and the rotating shaft of the air duct plate 9 is in transmission connection with the gear device 8; the cabinet door 5 rises to cause the upper ends of the air duct plates 9 to incline outwards, namely the lateral air duct openings formed by the adjacent air duct plates 9 are changed from a horizontal state to a horizontal upwards-inclined state, and the horizontal inclination angle of the air inlet 6 is increased, so that the air flow is approximately vertically downwards before entering the lateral air duct openings, and the lateral air duct openings inclined upwards horizontally are more beneficial to the entering of the air flow.
A second gear 805 is further arranged on a rotating shaft of the initial gear 801, and the second gear 805 is meshed with the vertical worm 806; the rotating shafts of the plurality of air duct plates 9 are all connected with driven gears 807, and the plurality of driven gears 807 are all meshed with the worm 806; when the cabinet door 5 is lifted, the rack 7 drives the transmission gear 801 to rotate, and the primary gear 801 drives the air duct plate 9 to rotate through the second gear 805, the worm 806 and the driven gear 807, so that the upper end of the air duct plate 9 inclines outwards; from top to bottom, the number of teeth of the driven gears 807 is gradually increased, that is, when the cabinet door 5 is lifted, the inclination angle of the air duct plate 9 above the cabinet door is larger, and the horizontal inclination angle of the side air duct opening above the cabinet door is larger; the speed of the air flow downwards from the top of the operation chamber 2 is reduced in the downward movement process, and the air flow with higher initial speed can be better sucked by the larger inclination angle of the side air duct opening close to the upper side.
The top of the operation chamber 2 is an arc surface, the curvature of the arc surface at the top gradually increases from the inner side to the outer side of the operation chamber 2, and the outermost side of the arc surface at the top of the operation chamber 2 is tangent to the vertical direction; the air outlet direction of the air inlet 6 is deviated to the upper part of the inner side of the operation chamber 2, so that the arrangement of the top is more beneficial to air flow and reduces wind resistance; the air inlet 6 is inclined to blow out air flow upwards to form an air curtain to prevent the exchange of internal air and external air, the air flow then flows along the top of the cambered surface, the direction of the air flow is transited downwards, and then the air flow enters the exhaust channel from the air duct plate 9.
The above description is only a preferred embodiment of the present invention, and it should be noted that: for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present invention.
Claims (6)
1. The utility model provides a return air type laboratory fume chamber which characterized in that: the ventilating cabinet comprises a ventilating cabinet body (1), wherein an operation chamber (2) is arranged in the middle of the ventilating cabinet body (1), and an air outlet (3) is arranged above the operation chamber (2); the operation chamber (2) comprises an operation table (4), an air inlet (6) is formed in the edge of one side, close to the cabinet door (5), of the operation table (4), and the air inlet (6) faces the upper portion of the rear wall of the operation chamber (2); the air inlet (6) is in a long and narrow outward expansion shape, and the air inlet (6) is rotatably connected with an air inlet pipeline; one side of the cabinet door (5) is connected with a rack (7), a gear device (8) matched with the rack (7) is arranged inside the cabinet wall, and the gear device (8) is in transmission connection with a rotating shaft of the air inlet (6); the cabinet door (5) rises, and the rack (7) causes the inclination angle of the air inlet (6) and the horizontal direction to be increased.
2. A return air type laboratory fume hood according to claim 1, wherein: the gear device (8) comprises a primary motion gear (801), a transmission bevel gear (802) and a transmission belt (803), and one end of the rotating shaft of the air inlet (6) is connected with a motion bevel gear (804); the primary gear (801) is positioned inside the cabinet wall, the primary gear (801) is meshed with the rack (7), and a rotating shaft of the primary gear (801) is vertical to the cabinet door (5); the initial motion gear (801) is in transmission connection with the transmission bevel gear (802) through the transmission belt (803), and the transmission bevel gear (802) is meshed with the driven bevel gear (804).
3. A return air type laboratory fume hood according to claim 2, wherein: a plurality of air duct plates (9) are arranged on the rear cabinet wall opposite to the cabinet door (5) in the operation chamber (2), and the air duct plates (9) are spaced from the rear cabinet wall to form an air exhaust channel; the length direction of wind channel board (9) is mutually perpendicular with vertical direction, and is a plurality of the vertical interval of wind channel board (9) is arranged, and from top to bottom the interval reduces gradually.
4. A return air type laboratory fume hood according to claim 3, wherein: the air duct plate (9) is arranged in a rotating mode, and a rotating shaft of the air duct plate (9) is in transmission connection with the gear device (8); the cabinet door (5) rises to enable the upper ends of the air duct plates (9) to incline outwards.
5. A return air type laboratory fume hood according to claim 4, wherein: a second gear (805) is further arranged on a rotating shaft of the initial gear (801), and the second gear (805) is meshed with the vertical worm (806); the rotating shafts of the plurality of air duct plates (9) are connected with driven gears (807), and the plurality of driven gears (807) are meshed with the worm (806); from top to bottom, the number of teeth of a plurality of driven gears (807) increases gradually.
6. A return air type laboratory fume hood according to claim 1, wherein: the top of the operation chamber (2) is provided with an arc surface, the curvature of the arc surface at the top is gradually increased from the inner side of the operation chamber (2) to the outer side, and the outermost side of the arc surface at the top of the operation chamber (2) is tangent to the vertical direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922076470.7U CN211084346U (en) | 2019-11-27 | 2019-11-27 | Air return type laboratory fume chamber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922076470.7U CN211084346U (en) | 2019-11-27 | 2019-11-27 | Air return type laboratory fume chamber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211084346U true CN211084346U (en) | 2020-07-24 |
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ID=71645626
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922076470.7U Active CN211084346U (en) | 2019-11-27 | 2019-11-27 | Air return type laboratory fume chamber |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211084346U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115283389A (en) * | 2022-07-01 | 2022-11-04 | 美加力环境工程(北京)有限公司 | Air-adjusting type ventilation cabinet |
-
2019
- 2019-11-27 CN CN201922076470.7U patent/CN211084346U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115283389A (en) * | 2022-07-01 | 2022-11-04 | 美加力环境工程(北京)有限公司 | Air-adjusting type ventilation cabinet |
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