Fireproof laboratory ventilation cabinet

Abstract

The utility model discloses a fireproof laboratory fume cupboard, which belongs to the technical field of fume cupboards and comprises a cupboard body, an exhaust fan mounted at the top of the cupboard body, a sliding door slidably connected to a port of the cupboard body and an air inlet pipe connected to the side wall of the cupboard body. A first electric airtight valve is installed on the air inlet pipe, a mounting base is detachably connected to the outer side wall, away from the air inlet pipe, of the cabinet body, an arc-shaped groove is longitudinally formed in the surface of the mounting base, an air storage bottle is placed in the arc-shaped groove, hoops connected with the mounting base are arranged on the two sides of the air storage bottle correspondingly, and the air inlet pipe is connected with the air inlet pipe. The top end of the gas storage bottle is communicated with a gas outlet pipe, a gas inlet formed in the side wall of the cabinet body is formed in the upper portion of the gas outlet pipe, the oxygen content in the cabinet body can be gradually reduced, fire spreading is prevented, finally, oil inflammables are extinguished, burning explosion in the fire extinguishing process can be effectively prevented, and danger is avoided.

Description

Technical Field

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

[0002] Cabinet-type exhaust hoods, commonly known as fume hoods, are similar to enclosed hoods. Small parts spray painting cabinets and chemical laboratory fume hoods are typical examples of cabinet-type exhaust hood structures. Large chamber-type fume hoods have one side completely open, allowing operators to work inside; they are mainly used for painting large parts and bagging powder materials. The working opening of the fume hood significantly affects the airflow distribution within, which in turn directly impacts the effectiveness of the cabinet-type exhaust hood.

[0003] Patent publication number CN213968229U discloses a fireproof fume hood for laboratory use. This fireproof fume hood includes a main body with a fume hood opening at the front. A base is located at the bottom of the main body, and a control panel is mounted on one outer surface of the main body. A movable cabinet is mounted on top of the base, and an operating table is mounted on top of the movable cabinet. A baffle plate is mounted on one side of the top of the operating table. A water supply device is installed inside the fume hood opening. Side air vents are located on the inner wall of the main body near the fume hood opening. An air inlet grille is located on top of the fume hood opening. A top plate is mounted on top of the main body, with an air outlet and an air inlet on the upper outer surface of the top plate. The water supply device consists of a water pipe and a spray head. This invention, by incorporating a fireproof and heat-insulating layer, provides better fireproof and heat-insulating properties. The device has a simple structure, is easy to operate, occupies little space, and offers diverse functions, meeting the needs of laboratory use.

[0004] However, the patent publication number CN213968229U describes a water supply device consisting of a water pipe and a spray head. The water pipe is connected to the spray head via a water pipe at its bottom, and there are five sets of spray heads with spray holes at the top. While the water supply device can prevent fires, it can easily cause combustion and explosion in a confined space when spraying flammable oils, posing a danger. Therefore, we propose a fireproof laboratory fume hood to solve the above-mentioned problems. Utility Model Content

[0005] 1. Technical problems to be solved

[0006] In view of the problems existing in the prior art, the purpose of this utility model is to provide a fireproof laboratory fume hood that can gradually reduce the oxygen content in the cabinet, prevent the spread of fire, and eventually extinguish flammable oils and other materials. It can effectively prevent explosions during the fire extinguishing process and avoid danger.

[0007] 2. Technical Solution

[0008] To solve the above problems, the present invention adopts the following technical solution.

[0009] A fireproof laboratory fume hood includes a cabinet body, an exhaust fan installed on the top of the cabinet body, a sliding door slidably connected to the port of the cabinet body, and an air inlet pipe connected to the side wall of the cabinet body, wherein a first electric airtight valve is installed on the air inlet pipe.

[0010] A mounting base is detachably connected to the outer wall of the cabinet away from the air inlet pipe. The surface of the mounting base has a longitudinal arc-shaped groove, and a gas storage cylinder is placed in the arc-shaped groove. Both sides of the gas storage cylinder are provided with clamps connected to the mounting base. The top of the gas storage cylinder is connected to an air outlet pipe. An air inlet is provided above the air outlet pipe at the side wall of the cabinet, and the air inlet is connected to the air outlet pipe. A second electric airtight valve is installed on the air inlet.

[0011] The exhaust fan has an exhaust pipe connected to its outlet end. A semi-circular connecting plate is fixedly connected to the inner side of the exhaust pipe. A semi-circular anti-reverse plate is hinged to the edge of the connecting plate.

[0012] Furthermore, a limiting baffle is fixedly connected above the connecting plate, and the limiting baffle protrudes from the edge of the connecting plate.

[0013] Furthermore, the clamps are arranged in two sets longitudinally, and each set of clamps has two clamps arranged laterally;

[0014] A locking bolt is installed between the ends of each pair of clamps.

[0015] Furthermore, a shut-off valve is installed at the base of the vent pipe.

[0016] Furthermore, a two-way connector is provided between the air outlet pipe and the air inlet.

[0017] Furthermore, a control host is installed on one side of the mounting base, and the output terminal of the control host is electrically connected to the input terminals of the exhaust fan, the first electric airtight valve, and the second electric airtight valve, respectively.

[0018] Furthermore, the cabinet body is made of stainless steel, and the inner lining of the cabinet body is made of flame-retardant ceramic material;

[0019] The sliding door is made of double-layered laminated fireproof glass;

[0020] The gas cylinder contains carbon dioxide gas.

[0021] 3. Beneficial effects

[0022] Compared with existing technologies, the advantages of this utility model are:

[0023] (1) In this scheme, when the flammable oil in the cabinet catches fire, the staff quickly closes the sliding door. At the same time, the first electric airtight valve installed on the air inlet pipe works to stop the air from entering the air inlet pipe, while the second electric airtight valve installed on the air inlet opens, so that the carbon dioxide gas in the gas cylinder is quickly injected into the inner cavity of the cabinet through the air outlet pipe and the air inlet. Since carbon dioxide is heavier than oxygen, the carbon dioxide sinks and squeezes out the oxygen in the cabinet. When the oxygen is discharged through the exhaust pipe by the continuous operation of the exhaust fan, the check plate will flip upward with the connecting plate. After the carbon dioxide gas fills the inner cavity of the cabinet, the exhaust fan stops working and the check plate closes, which can effectively prevent oxygen-containing air from entering the cabinet. The oxygen content in the cabinet gradually decreases, preventing the fire from spreading and finally extinguishing the flammable oil. This can effectively prevent the explosion during the fire extinguishing process and avoid danger.

[0024] (2) In this scheme, when the anti-reverse plate flips upward, it abuts against the limit baffle, which can effectively prevent the anti-reverse plate from flipping excessively, so as to ensure the anti-reverse function of the anti-reverse plate. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0026] Figure 2 This is a structural schematic diagram of the present invention from another perspective;

[0027] Figure 3 This is a schematic diagram of the mounting base structure of this utility model;

[0028] Figure 4 This is an enlarged schematic diagram of part A of the present invention;

[0029] Figure 5 This is a front view schematic diagram of the exhaust pipe of this utility model;

[0030] Figure 6 This is a cross-sectional view of the exhaust pipe AA section of this utility model.

[0031] Explanation of the labels in the diagram:

[0032] 1. Cabinet; 2. Exhaust fan; 3. Sliding door; 4. Air inlet pipe; 5. First electric airtight valve; 6. Mounting base; 7. Gas cylinder; 8. Clamp; 9. Air outlet pipe; 10. Shut-off valve; 11. Air inlet; 12. Second electric airtight valve; 13. Two-way connector; 14. Exhaust pipe; 15. Connecting plate; 16. Check plate; 17. Limit baffle. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0034] Example:

[0035] Please see Figure 1-6 A fireproof laboratory fume hood includes a cabinet body 1, an exhaust fan 2 installed on the top of the cabinet body 1, a sliding door 3 slidably connected to the port of the cabinet body 1, and an air inlet pipe 4 connected to the side wall of the cabinet body 1. A first electric airtight valve 5 is installed on the air inlet pipe 4.

[0036] A mounting base 6 is detachably connected to the outer wall of the cabinet 1 away from the air inlet pipe 4. The surface of the mounting base 6 has an arc-shaped groove in the longitudinal direction, and a gas storage cylinder 7 is placed in the arc-shaped groove. Both sides of the gas storage cylinder 7 are provided with clamps 8 connected to the mounting base 6. The top of the gas storage cylinder 7 is connected to an air outlet pipe 9. An air inlet 11 is provided above the air outlet pipe 9 at the side wall of the cabinet 1, and the air inlet 11 is connected to the air outlet pipe 9. A second electric airtight valve 12 is installed on the air inlet 11.

[0037] The exhaust fan 2 is connected to an exhaust pipe 14 at its outlet. A connecting plate 15 with a semi-circular structure is fixedly connected to the inner side of the exhaust pipe 14. A backflow preventer 16 with a semi-circular structure is hinged to the edge of the connecting plate 15.

[0038] It should be noted that when this fireproof laboratory fume hood is in use, if the flammable oil in cabinet 1 catches fire, the staff should quickly close the sliding door 3. At the same time, the first electric airtight valve 5 installed on the air inlet pipe 4 will stop the air from entering the air inlet pipe 4, while the second electric airtight valve 12 installed on the air inlet 11 will open, allowing the carbon dioxide gas in the gas cylinder 7 to be quickly injected into the inner cavity of cabinet 1 through the air outlet pipe 9 and the air inlet 11. Since carbon dioxide is heavier than oxygen, it will sink and squeeze out the oxygen in cabinet 1. As the oxygen is continuously discharged through the exhaust pipe 14 by the continuous operation of the exhaust fan 2, the check plate 16 will flip upward with the connecting plate 15. After the carbon dioxide gas fills the inner cavity of cabinet 1, the exhaust fan 2 will stop working and the check plate 16 will close, which can effectively prevent oxygen-containing air from entering cabinet 1. The oxygen content in cabinet 1 will gradually decrease, preventing the fire from spreading and eventually extinguishing the flammable oil. This can effectively prevent combustion and explosion during the fire extinguishing process and avoid danger.

[0039] like Figure 6As shown, a limiting baffle 17 is fixedly connected above the connecting plate 15, and the limiting baffle 17 protrudes from the edge of the connecting plate 15.

[0040] It should be noted that when the anti-reverse plate 16 flips upward and abuts against the limit baffle 17, the anti-reverse plate 16 can be effectively prevented from flipping excessively, so as to ensure the anti-reverse function of the anti-reverse plate 16.

[0041] like Figure 3 As shown, there are two sets of clamps 8 arranged longitudinally, and each set of clamps 8 has two clamps arranged laterally.

[0042] Each set of two clamps 8 is fitted with a locking bolt between the ends;

[0043] It should be noted that by using the clamp 8 in conjunction with the locking bolt to tighten and fit against the outer wall of the gas cylinder 7, it is convenient to disassemble and install the gas cylinder 7.

[0044] like Figure 3 As shown, a shut-off valve 10 is installed at the root of the air outlet pipe 9, and a two-way connector 13 is connected between the air outlet pipe 9 and the air inlet 11.

[0045] It should be noted that when the outlet pipe 9 is connected to the inlet 11 through the two-way connector 13, the shut-off valve 10 is opened so that the carbon dioxide gas in the gas storage cylinder 7 can be injected into the cabinet 1 at any time.

[0046] like Figure 1 , Figure 2 , Figure 4 As shown, a control host 18 is installed on one side of the mounting base 6, and the output terminal of the control host 18 is electrically connected to the input terminals of the exhaust fan 2, the first electric airtight valve 5, and the second electric airtight valve 12, respectively.

[0047] It should be noted that the start and stop of the exhaust fan 2, the first electric airtight valve 5 and the second electric airtight valve 12 can be controlled separately by the control host 18.

[0048] Cabinet 1 is made of stainless steel, and the inner lining of cabinet 1 is made of flame-retardant ceramic material;

[0049] Sliding door 3 is made of double-layered laminated fireproof glass;

[0050] Gas cylinder 7 contains carbon dioxide gas;

[0051] It should be noted that this effectively prevented the fire from spreading.

[0052] In use: When the flammable oil in cabinet 1 catches fire, the operator quickly closes the sliding door 3. At the same time, the first electric airtight valve 5 installed on the air inlet pipe 4 stops the air from entering the air inlet pipe 4, while the second electric airtight valve 12 installed on the air inlet 11 opens, allowing the carbon dioxide gas in the gas cylinder 7 to be quickly injected into the inner cavity of cabinet 1 through the air outlet pipe 9 and the air inlet 11. Since carbon dioxide is heavier than oxygen, the carbon dioxide sinks and squeezes out the oxygen in cabinet 1. As the oxygen is continuously discharged through the exhaust pipe 14 by the continuous operation of the exhaust fan 2, the check plate 16 will flip upward with the connecting plate 15. After the carbon dioxide gas fills the inner cavity of cabinet 1, the exhaust fan 2 stops working and the check plate 16 closes, which can effectively prevent oxygen-containing air from entering cabinet 1. The oxygen content in cabinet 1 gradually decreases, preventing the fire from spreading and eventually extinguishing the flammable oil.

[0053] The above description is merely a preferred embodiment of this utility model; however, the protection scope of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and its improved concept, should be included within the protection scope of this utility model.

Claims

1. A fireproof laboratory fume hood, comprising a cabinet body (1), an exhaust fan (2) installed on the top of the cabinet body (1), a sliding door (3) slidably connected to the port of the cabinet body (1), and an air inlet pipe (4) connected to the side wall of the cabinet body (1), characterized in that: The air intake pipe (4) is equipped with a first electric airtight valve (5); A mounting base (6) is detachably connected to the outer wall of the cabinet (1) away from the air inlet pipe (4). The surface of the mounting base (6) is longitudinally provided with an arc-shaped groove, and a gas storage bottle (7) is placed in the arc-shaped groove. Both sides of the gas storage bottle (7) are provided with clamps (8) connected to the mounting base (6). The top of the gas storage bottle (7) is connected to an air outlet pipe (9). An air inlet (11) is provided above the air outlet pipe (9) at the side wall of the cabinet (1), and the air inlet (11) is connected to the air outlet pipe (9). A second electric airtight valve (12) is installed on the air inlet (11). The exhaust fan (2) is connected to an exhaust pipe (14) at its air outlet. A connecting plate (15) with a semi-circular structure is fixedly connected to the inner side of the exhaust pipe (14). A check plate (16) with a semi-circular structure is hinged to the edge of the connecting plate (15).

2. The fireproof laboratory fume hood according to claim 1, characterized in that: A limiting baffle (17) is fixedly connected above the connecting plate (15), and the limiting baffle (17) protrudes from the edge of the connecting plate (15).

3. A fireproof laboratory fume hood according to claim 1, characterized in that: The clamps (8) are arranged in two sets longitudinally, and each set of clamps (8) has two clamps arranged laterally; A locking bolt is installed between the ends of each pair of clamps (8).

4. A fireproof laboratory fume hood according to claim 1, characterized in that: A shut-off valve (10) is installed at the root of the vent pipe (9).

5. A fireproof laboratory fume hood according to claim 1, characterized in that: The air outlet (9) and the air inlet (11) are connected by a two-way connector (13).

6. A fireproof laboratory fume hood according to claim 1, characterized in that: A control host (18) is installed on one side of the mounting base (6), and the output end of the control host (18) is electrically connected to the input end of the exhaust fan (2), the first electric airtight valve (5), and the second electric airtight valve (12).

7. A fireproof laboratory fume hood according to claim 1, characterized in that: The cabinet (1) is made of stainless steel, and the inner lining of the cabinet (1) is made of flame-retardant ceramic material; The sliding door (3) is made of double-layered laminated fireproof glass; The gas cylinder (7) contains carbon dioxide gas.

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