A fume hood for laboratory use

Abstract

The utility model relates to a ventilation cabinet technical field discloses a laboratory ventilation cabinet, including the cabinet, the cabinet top is fixed with the mesa, the cabinet top is fixed with the box, its characterized in that, the box is both sides as double -deck board, the glass window of up and down pull is installed to the box front side, the box top is fixed with the roof, the roof is fixed with the wind cover on, the box is fixed in the backboard with the wind cover intercommunication's flow guide storehouse, the flow guide storehouse bottom fixed and the conduction have a plurality of branch pipes and an adjustment suction device, branch pipe outside and bottom and the box intercommunication, the box front side is installed with the air supplement device. The utility model realizes the angle, distance, the regulation of range of suction pipe head, makes the suction groove accurate alignment dynamic or local air source, directly sucks in the harmful gas diffusion moment, and completely blocks the gas diffusion path.

Description

Technical Field

[0001] This utility model relates to the field of fume hood technology, and in particular to a laboratory fume hood. Background Technology

[0002] Fume hoods are core safety equipment in laboratories. They create a negative pressure environment inside the hood to expel volatile solvents, toxic vapors, and other harmful gases generated during experiments, preventing contaminants from spreading to the work area and protecting the health of laboratory personnel. They rely on airflow generated by a fan to expel harmful gases from the hood through fixed intake vents and guide channels to the outside. Traditional fume hoods often have intake vents fixed to the top or back, relying solely on overall negative pressure to capture diffused gases, which poses a high risk of escape from the work area.

[0003] Patent CN110201964B discloses a laboratory fume hood, including a workbench. The edge of the workbench is equipped with a blower assembly to prevent air from escaping from the workbench surface. The blower assembly includes a bellows, multiple fans installed within the bellows, and multiple air outlets on the bellows. The bellows is fixedly connected to the workbench. When the bellows is installed on the workbench, the air outlets face the interior of the fume hood. It automatically blows air into the fume hood when the protective door is opened, preventing harmful gases from escaping from the workbench surface.

[0004] The existing technical solutions mentioned above have the following drawbacks: the air hood has a fixed suction position, which cannot be moved to get closer to the local air source, causing the gas to diffuse into a large space inside the cabinet before being sucked away, resulting in low capture efficiency. Even with the blowing component, harmful gases are still likely to escape from the operating port. Utility Model Content

[0005] The purpose of this invention is to provide a laboratory fume hood that can accurately target the source and be flexibly adjusted to improve the fume hood's efficiency in capturing harmful gases and its operational safety.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A laboratory fume hood includes a cabinet body, a tabletop fixed to the top surface of the cabinet body, and a box body fixed to the top of the cabinet body. The box body has double-layered panels on both the left and right sides, a liftable glass window installed on the front side of the box body, a top plate fixed to the top of the box body, a fan hood fixed to the top plate, a flow guide chamber communicating with the fan hood fixed to the rear panel inside the box body, multiple branch pipes fixed to and connected to the bottom of the flow guide chamber, and an adjustable air intake device. The outer sides and bottoms of the branch pipes communicate with the box body, and a makeup air device is installed on the front side of the box body.

[0007] Preferably, the adjustable air intake device includes a main pipe, a rotating pipe, a hinge, a telescopic pipe, an air intake head, and an air intake groove. The main pipe is vertically fixed to the middle of the flow guide chamber. The bottom of the main pipe is hinged to a rotating pipe. The rotating pipe is horizontal and has an air vent that communicates with the outside. The telescopic pipe is vertically fixed to the rotating pipe. An air intake head is vertically fixed to the front end of the telescopic pipe. An axial air intake groove is formed on the outer wall of the air intake head.

[0008] Preferably, the telescopic tube includes telescopic tube A and telescopic tube B. Telescopic tube A is perpendicularly fixed and connected to the rotating tube, and telescopic tube B is slidably connected to the inside of telescopic tube A. Telescopic tube B is perpendicularly fixed and connected to the suction tube head.

[0009] Preferably, an extension tube head is also installed on the left and right sides of the air intake head. The outer side of the extension tube head is blocked, and the inner side is connected to the air intake head. The outer wall of the extension tube head has the same air intake groove, and the inner wall of the air intake head has an axial guide groove. A guide block is fixed to the outer wall of the extension tube head and slides along the guide groove.

[0010] Preferably, the hinge is a torque hinge.

[0011] Preferably, the air supply device includes a blower, a main air duct, branch air ducts, and air ducts. The blower is fixed to the top plate, the blower outlet is equipped with the main air duct, the main air duct is connected to the branch air duct, the branch air duct is bent into a rectangular frame shape and located on the front side of the housing, and air ducts are opened below the vertical pipes on both sides and the horizontal pipe at the bottom of the branch air duct.

[0012] Preferably, a tube cover is fixed on the front side of the table, the bottom horizontal tube of the blower branch pipe is located inside the tube cover, the tube cover has a tube cover air hole facing the inside of the box, and the blower groove of the bottom horizontal tube of the blower branch pipe faces the tube cover air hole.

[0013] Preferably, the vertical pipes on both sides of the blower branch pipe are located inside the double-layer plates on the left and right sides of the box body, and the front end of the inner side of the double-layer plates on both sides has a box body air hole, and the blower grooves below the vertical pipes on both sides of the blower branch pipe face the box body air hole.

[0014] This utility model has the following beneficial effects: 1. The rotating tube can be rotated and fixed in a vertical to horizontal state through a torque hinge, without the need for manual support. Pulling out the telescopic tube B can adjust the front and rear distance between the suction tube head and the air source. The extended tube head slides along the guide groove of the suction tube head, which can adjust the left and right coverage range of the suction channel. This allows for adjustment of the angle, distance, and range of the suction tube head, so that the suction channel can be precisely aligned with the dynamic or local air source, directly sucking in harmful gases the moment they escape, and completely blocking the gas diffusion path. 2. The blower of the air supply device can supply air to the operating port through the air duct, forming an air curtain to prevent harmful gases from approaching the operating port in the opposite direction, avoid the overflow of harmful gases inside the box, and prevent external air disturbances from carrying out pollutants inside the box. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the appearance and structure of this utility model; Figure 2 This is a schematic diagram of the position of the air intake device of this utility model; Figure 3 This is a longitudinal sectional view of the box body 3 of this utility model; Figure 4 This is a schematic diagram of the external structure of the adjustable intake device of this utility model; Figure 5 This is a cross-sectional schematic diagram of the air intake adjustment device of this utility model; Figure 6 This is a schematic diagram of the external structure of the air supply device of this utility model; Figure 7 This is a utility model Figure 3 Enlarged view of B in the middle; Figure 8 This is a utility model Figure 2 Enlarged view of A in the middle; Icons: 1. Cabinet; 2. Countertop; 21. Pipe cover; 22. Pipe cover vent; 3. Box; 31. Box vent; 4. Glass window; 5. Top panel; 6. Air hood; 7. Air guide chamber; 8. Branch pipe; 9. Adjustable air intake device; 91. Main pipe; 92. Rotary pipe; 921. Ventilation slot; 93. Hinge; 94. Telescopic pipe; 941. Telescopic pipe A; 942. Telescopic pipe B; 95. Air intake head; 951. Guide groove; 96. Air intake groove; 97. Extended pipe head; 10. Make-up air device; 101. Blower; 102. Main air duct; 103. Branch air duct; 104. Air duct. Detailed Implementation

[0016] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0017] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0018] like Figure 1-3 As shown, in this embodiment, a laboratory fume hood includes a cabinet body 1, a tabletop 2 fixed to the top surface of the cabinet body 1, a box body 3 fixed to the top of the cabinet body 1, the box body 3 having double-layered panels on the left and right sides, a liftable glass window 4 installed on the front side of the box body 3, the space between the glass window 4 and the tabletop 2 serving as an operating opening for the experimenter, a top plate 5 fixed to the top of the box body 3, a fan hood 6 fixed to the top plate 5, a guide chamber 7 connected to the fan hood 6 fixed to the rear panel inside the box body 3, multiple branch pipes 8 fixed to and connected to the bottom of the guide chamber 7, and an adjustable air intake device 9, the outer side and bottom of the branch pipes 8 communicating with the box body 3 to provide a basic airflow channel and reduce dead air angles inside the box body 3, and a make-up air device 10 installed on the front side of the box body 3.

[0019] Specifically, a fan draws air from outside the hood 6. The fan is electrically connected to the distribution box and can be started and stopped via a control button. A strong negative pressure suction force is generated inside the hood 6, and through the connected branch pipe 8 and the regulating suction device 9, harmful gases, vapors, or dust generated during the experiment are forcibly captured and effectively discharged outdoors, protecting the laboratory environment and personnel safety. The regulating suction device 9 can be located close to the source of harmful gases, greatly reducing the risk of gas leakage. The make-up air device 10 forms an air curtain on the front of the chamber 3 to further prevent harmful gases from leaking out of the chamber 3.

[0020] like Figure 4 As shown, the adjustable suction device 9 includes a main pipe 91, a rotating pipe 92, a hinge 93, a telescopic pipe 94, a suction pipe head 95, and a suction groove 96. The main pipe 91 is vertically fixed to the middle of the flow guide chamber 7. The bottom of the main pipe 91 is hinged to the rotating pipe 92 via the hinge 93. The rotating pipe 92 is horizontal and has an air vent 921 on its outer wall that communicates with the inside. The telescopic pipe 94 is vertically fixed to the rotating pipe 92. When the telescopic pipe 94 is in a vertical state, the rotating pipe 92 is isolated from the main pipe 91. When the telescopic pipe 94 is rotated to a horizontal state, it communicates with the main pipe 91 through the air vent 921. The front end of the telescopic pipe 94 is vertically fixed to the suction pipe head 95. The outer wall of the suction pipe head 95 has an axial suction groove 96.

[0021] Specifically, the rotating tube 92, along with the associated telescopic tube 94 and suction head 95, can be rotated from a vertical storage position to a horizontal working position via the torque hinge 93. This allows the suction slot 96 to move more accurately to the odor source, creating a localized high negative pressure point. Harmful gases are forcefully sucked away before they can dissipate, greatly reducing the chance of pollutants accumulating in the housing 3 and escaping from the operating port. like Figure 5As shown, the telescopic tube 94 includes telescopic tube A941 and telescopic tube B942. Telescopic tube A941 is perpendicularly fixed to and communicates with the rotating tube 92. Telescopic tube B942 is slidably connected to telescopic tube A941 through a sealing ring. Telescopic tube B942 is perpendicularly fixed to and communicates with the suction head 95. Manually pulling the telescopic tube B942 allows the suction slot 96 to be precisely positioned at the distance from the pollution source.

[0022] like Figure 4-5 As shown, extended pipe heads 97 are installed on both sides of the suction pipe head 95. The outer side of the extended pipe head 97 is sealed, while the inner side communicates with the suction pipe head 95. The outer wall of the extended pipe head 97 has the same suction groove 96, and the inner wall of the suction pipe head 95 has an axially formed guide groove 951. A guide block is fixed to the outer wall of the extended pipe head 97 and slides along the guide groove 951. The ventilation area of ​​the suction groove 96 can be increased or decreased by sliding the extended pipe head 97, thereby meeting the needs of suctioning air sources of different sizes and further ensuring that harmful gases can be discharged from the hood 6.

[0023] The hinge 93 is a torque hinge. The torque hinge provides damping, which enables the telescopic tube 94 to maintain a fixed angle after rotation without manual support, and allows the intake tube head 95 to remain stable within any adjustable angle.

[0024] like Figure 6 As shown, the air supply device 10 includes a blower 101, a main air duct 102, a branch air duct 103, and an air duct 104. The blower 101 is fixed to the top plate 5. The blower 101 has the main air duct 102 installed at its air outlet. The air inlet of the blower 101 is connected to the outside air through a filter. The main air duct 102 is connected to the branch air duct 103. The branch air duct 103 is bent into a rectangular frame shape and is located on the front side of the housing 3. Air ducts 104 are opened below the vertical pipes on both sides and the horizontal pipe at the bottom of the branch air duct 103.

[0025] Specifically, a proximity switch is installed between the glass window 4 and the countertop 2. When the glass window 4 is pulled up, the cabinet 3 is opened, and the blower 101 is automatically started through the controller of the distribution box. The air blows out from the air duct 104 to supplement the operating port below the glass window 4 to form an air curtain, preventing harmful gases from approaching the operating port in the opposite direction, avoiding the overflow of harmful gases in the cabinet 3, and preventing external air disturbances from carrying out pollutants in the cabinet 3.

[0026] like Figure 7-8 As shown, a tube cover 21 is fixed to the front side of the platform 2. The bottom horizontal tube of the blower branch pipe 103 is located inside the tube cover 21. The tube cover 21 has a tube cover air hole 22 facing the inside of the box body 3. The blower groove 104 of the bottom horizontal tube of the blower branch pipe 103 faces the tube cover air hole 22. The airflow is blown out from the tube cover air hole 22 of the tube cover 21, forming a horizontal inward air curtain along the bottom edge of the operating port.

[0027] like Figure 7-8 As shown, the two vertical pipes of the blower branch pipe 103 are located inside the double-layered plates on the left and right sides of the housing 3. The front end of the inner side of the double-layered plates on both sides has a housing air hole 31. The blower slots 104 below the two vertical pipes of the blower branch pipe 103 face the housing air hole 31. The airflow is blown out through the housing air hole 31, forming a vertically inward air curtain along the left and right edges of the operating port.

[0028] The working principle of this utility model is as follows: an external fan draws air through the hood 6, forming a stable negative pressure zone in the guide chamber 7. Harmful gases are removed from the chamber 3 through the branch pipe 8. When the glass window 4 is pulled up, the operating port opens, and the proximity switch automatically starts the blower 101. Airflow is blown out from the bottom air duct 104 of the blowing branch pipe 103, and then blown out from the hood air hole 22 and the chamber air hole 31, forming an air curtain to prevent pollutants from escaping from the chamber 3. When opening the experimental vessel containing harmful gases, the telescopic tube 94 is rotated to a horizontal position, so that the rotating tube 92 is connected to the main tube 91 through the ventilation slot 921. The telescopic tube B942 is manually pulled to adjust the front and rear position of the suction duct 96 to be closer to the gas source. The extension tube head 97 is manually adjusted to adjust the suction range of the suction duct 96, so that the harmful gases are forcefully sucked away before they dissipate.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A laboratory fume hood, comprising a cabinet body (1), a tabletop (2) fixed to the top surface of the cabinet body (1), and a box body (3) fixed to the top of the cabinet body (1), characterized in that, The box (3) has double-layered panels on the left and right sides. A glass window (4) that can be lifted up and down is installed on the front side of the box (3). A top plate (5) is fixed on the top of the box (3). A wind hood (6) is fixed on the top plate (5). A flow guide chamber (7) that communicates with the wind hood (6) is fixed on the back panel inside the box (3). Multiple branch pipes (8) and an air intake adjustment device (9) are fixed and connected to the bottom of the flow guide chamber (7). The outer side and bottom of the branch pipes (8) communicate with the box (3). A supplementary air device (10) is installed on the front side of the box (3).

2. A laboratory fume hood according to claim 1, characterized in that, The regulating suction device (9) includes a main pipe (91), a rotating pipe (92), a hinge (93), a telescopic pipe (94), a suction pipe head (95), and a suction groove (96). The main pipe (91) is vertically fixed to the middle of the guide chamber (7). The bottom of the main pipe (91) is hinged to the rotating pipe (92) via the hinge (93). The rotating pipe (92) is horizontal and has an air vent (921) that communicates with the outside. The rotating pipe (92) is vertically fixed to the telescopic pipe (94). The front end of the telescopic pipe (94) is vertically fixed to the suction pipe head (95). The outer wall of the suction pipe head (95) has an axial suction groove (96).

3. A laboratory fume hood according to claim 2, characterized in that, The telescopic tube (94) includes a telescopic tube A (941) and a telescopic tube B (942). The telescopic tube A (941) is perpendicularly fixed and connected to the rotating tube (92). The telescopic tube B (942) is sealed and slidably connected inside the telescopic tube A (941). The telescopic tube B (942) is perpendicularly fixed and connected to the suction head (95).

4. A laboratory fume hood according to claim 2, characterized in that, Extended pipe heads (97) are also installed on the left and right sides of the air intake head (95). The outer side of the extended pipe head (97) is blocked, and the inner side is connected to the air intake head (95). The outer wall of the extended pipe head (97) has the same air intake groove (96). The inner wall of the air intake head (95) has an axial guide groove (951). The outer wall of the extended pipe head (97) is fixed with a guide block that slides along the guide groove (951).

5. A laboratory fume hood according to claim 2, characterized in that, The hinge (93) is a torque hinge.

6. A laboratory fume hood according to claim 1, characterized in that, The air supply device (10) includes a blower (101), a main air pipe (102), a branch air pipe (103), and an air duct (104). The blower (101) is fixed to the top plate (5). The blower (101) has a main air pipe (102) installed at its air outlet. The main air pipe (102) is connected to a branch air pipe (103). The branch air pipe (103) is bent into a rectangular frame and located on the front side of the housing (3). Air ducts (104) are opened below the vertical pipes on both sides and the horizontal pipe at the bottom of the branch air pipe (103).

7. A laboratory fume hood according to claim 6, characterized in that, The front side of the table (2) is fixed with a tube cover (21). The bottom horizontal tube of the blower branch pipe (103) is located inside the tube cover (21). The tube cover (21) has a tube cover air hole (22) facing the inside of the box (3). The blower groove (104) of the bottom horizontal tube of the blower branch pipe (103) faces the tube cover air hole (22).

8. A laboratory fume hood according to claim 6, characterized in that, The vertical pipes on both sides of the blower branch pipe (103) are located inside the double-layer plate on the left and right sides of the box body (3). The box body air hole (31) is opened at the front end of the inner side of the double-layer plate on both sides. The blower groove (104) below the vertical pipes on both sides of the blower branch pipe (103) faces the box body air hole (31).

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