Exhaust fume collecting hood

Abstract

The utility model provides an exhaust fume collecting hood, and relates to the technical field of fire endurance test equipment, the exhaust fume collecting hood comprises a hood body, a flue assembly and a first moving mechanism, the flue assembly and the first moving mechanism are arranged on the hood body, the first hood body is inserted into a second hood body, an outer pipeline is fixedly arranged in the first hood body, an inner pipeline is arranged in the second hood body, and a first end of the inner pipeline is inserted into the outer pipeline; the second end of the inner pipeline is fixed to the end, away from the first cover body, of the second cover body, a plurality of smoke suction openings are formed in the inner pipeline, the first moving mechanism is arranged at the bottom end of the second cover body, and the moving direction of the first moving mechanism is consistent with the sleeving direction of the second cover body and the first cover body; the outer pipeline and the inner pipeline can synchronously and relatively move, so that the overall length of the exhaust fume collecting hood is adjusted, the exhaust fume collecting hood is matched with test samples of different sizes for use, the second hood body can move to the right upper part of the combustion furnace before and after use, the position of a furnace door of the combustion furnace is not shielded, and the test samples are convenient to mount and dismount.

Description

Technical Field

[0001] The present application relates to the technical field of fire resistance limit test equipment, and in particular to a smoke collection hood. Background Art

[0002] During the fire resistance limit test in the combustion furnace, the samples are subjected to high temperature burning, which will release toxic and harmful smoke and pollute the environment. Therefore, a smoke hood is usually used to collect the smoke to prevent the spread of toxic and harmful smoke.

[0003] Conventional fume hoods are fixed and difficult to adapt to test samples of different sizes. In addition, it is not conducive to installing and disassembling the test samples before and after use. Utility Model Content

[0004] An embodiment of the present application provides a smoke hood, wherein the hood body includes a first hood body and a second hood body, the first hood body is plugged into the second hood body, and the flue assembly includes an outer pipe and an inner pipe, the inner pipe is plugged into the outer pipe. When the first hood body and the second hood body move relative to each other, the outer pipe and the inner pipe can move synchronously relative to each other, thereby adjusting the overall length of the smoke hood so that it can be used with test samples of different sizes. Moreover, before and after use, the second hood body can be moved to the upper part of the combustion furnace without blocking the position of the furnace door of the combustion furnace, thereby facilitating the installation and disassembly of the test samples. This solves the problem that conventional smoke hoods are difficult to fit test samples of different sizes and are not conducive to the installation and disassembly of test samples before and after use.

[0005] The embodiment of the present application provides a smoke collection hood, comprising a hood body, a flue assembly and a first moving mechanism arranged on the hood body;

[0006] The cover body includes a first cover body and a second cover body, wherein the first cover body and the second cover body respectively cover two sides of the combustion furnace, and the second cover body is sleeved on the first cover body;

[0007] The flue assembly includes an outer pipe and an inner pipe, the outer pipe is fixed to the top of the first cover, the inner pipe is arranged on the top of the second cover, the first end of the inner pipe is inserted into the outer pipe, and the second end of the inner pipe is fixed to the end of the second cover away from the first cover, and the inner pipe is provided with a plurality of smoking ports;

[0008] The first moving mechanism is arranged at the bottom end of the second cover body, and the movement direction of the first moving mechanism is consistent with the sleeve connection direction of the second cover body and the first cover body.

[0009] In a feasible implementation, the smoke collection hood further includes a second moving mechanism;

[0010] The second moving mechanism is arranged at the bottom end of the first cover body, and the movement direction of the second moving mechanism is consistent with the sleeve connection direction of the second cover body and the first cover body.

[0011] In a feasible implementation, the first moving mechanism includes rollers, and a plurality of the rollers are evenly distributed at the bottom end of the second cover;

[0012] The second moving mechanism includes a guide rail and a slider. The two guide rails are laid in parallel on both sides of the combustion furnace. A plurality of sliders are evenly arranged on the bottom end of the first cover body. The plurality of sliders are slidably connected to the guide rail on the same side.

[0013] In a feasible implementation, the fume hood further includes a collection pipe, a hose, and environmental protection equipment;

[0014] The collecting pipe is fixed to the outer wall of the first cover body, and the plurality of outer pipes pass through the first cover body and are connected to the collecting pipe. The collecting pipe is connected to the environmental protection equipment through the hose.

[0015] In a feasible implementation, the smoke collecting hood further includes a lifting and shielding mechanism;

[0016] One end of the second cover body away from the first cover body is an open sample connection end, and the lifting shielding mechanism is fixedly arranged on the top of the sample connection end;

[0017] The lifting and shielding mechanism is an electric rolling door.

[0018] In a feasible implementation, one end of the first cover body away from the second cover body is an open avoidance end, and the combustion furnace passes through the avoidance end of the first cover body;

[0019] A tripod is provided on the top of the avoidance end.

[0020] In a feasible implementation, both ends of the inner wall of the outer pipe are provided with slide rails, and both ends of the outer wall of the inner pipe are provided with slide grooves;

[0021] The outer wall of the slide rail is slidably connected to the inner wall of the slide groove.

[0022] In a feasible implementation, the inner wall of the first cover is provided with a load-bearing frame, and a plurality of the load-bearing frames support the outer pipe;

[0023] The load-bearing frame includes two transverse rods and a plurality of longitudinal rods, the two transverse rods are arranged in parallel, the ends of the transverse rods are connected to the inner walls of the two sides of the first cover, the plurality of longitudinal rods are evenly distributed between the two transverse rods, and the ends of the longitudinal rods are respectively fixedly connected to the outer walls of the two transverse rods;

[0024] The outer pipe is fixed on the transverse rod body and the longitudinal rod body.

[0025] In a feasible implementation, a fixing piece is provided on the top of the second cover body, and the second end of the inner pipe is fixed on the fixing piece;

[0026] The fixing member includes a top plate and a connecting plate. The top plate is fixed on the top of the second cover body. The connecting plate is fixed on the top plate. The second end of the inner pipe is fixedly connected to the connecting plate.

[0027] In a feasible implementation, the sealing strip brush is fixed to the inner wall of the second cover body, and the inner end of the sealing strip brush is in contact with the outer wall of the first cover body.

[0028] The smoke collecting hood according to the embodiment of the present application comprises a smoke collecting hood including a hood body and a smoke duct assembly arranged on the hood body. The hood body includes a first hood body and a second hood body, the first hood body is plugged into the second hood body, at least part of the first hood body is located in the second hood body, the smoke duct assembly includes an outer pipe and an inner pipe, the outer pipe is fixed in the first hood body, the inner pipe is arranged in the second hood body, the first end of the inner pipe is plugged into the outer pipe, the second end of the inner pipe is fixed to the end of the second hood body away from the first hood body, and a plurality of smoke outlets are provided on the inner pipe, a first movable mechanism is arranged at the bottom end of the second hood body, and the movement direction of the first movable mechanism is consistent with the socket connection direction of the second hood body and the first hood body. When the first hood body and the second hood body move relative to each other, the outer pipe and the inner pipe can move relative to each other synchronously, thereby adjusting the overall length of the smoke collecting hood so that it can be used with test samples of different sizes. Moreover, before and after use, the second hood body can be moved to the top of the combustion furnace without blocking the furnace door position of the combustion furnace, thereby facilitating the installation and disassembly of the test sample. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the smoke collection hood provided by this application;

[0030] Figure 2 It is the front view of the fume hood;

[0031] Figure 3 It is a side cross-sectional view of the fume hood;

[0032] Figure 4 It is a cross-sectional view of the flue assembly.

[0033] Description of reference numerals:

[0034] 10-hood; 20-flue assembly; 30-first moving mechanism; 40-second moving mechanism; 50-collection pipe; 60-hose; 70-environmental protection equipment; 80-lifting shielding mechanism; 90-sealing strip brush;

[0035] 11-first cover; 12-second cover; 21-external pipe; 22-inner pipe; 23-smoking port; 24-slide rail; 25-slide groove; 26-bearing frame; 27-fixing part; 31-roller; 41-guide rail; 42-slider. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0037] The purpose of fire resistance limit test is to evaluate the fire resistance performance of building components or materials under standard fire resistance test conditions to ensure their safety performance in fire.

[0038] Fire resistance tests simulate fire conditions and examine the fire resistance of building components or materials to determine the time it takes for them to lose their support, integrity, or thermal insulation when exposed to fire. This metric is crucial for evaluating the fire resistance of building components or materials, as it directly impacts a building's safety and evacuation time during a fire. Fire resistance tests ensure that building components or materials maintain their structural integrity and functionality under standard fire test conditions, thereby safeguarding public safety.

[0039] Fire resistance limit test criteria include loss of stability (e.g., loss of support or deformation resistance), loss of integrity (e.g., the appearance of penetrating cracks or fire-permeable pores in separating components), and loss of thermal insulation (e.g., the temperature rise on the non-fired side of a component reaches a specific value). Meeting these conditions indicates that the component or material has reached its limit of fire resistance and needs to be replaced or improved to improve its fire resistance rating.

[0040] Furthermore, strict compliance with fire resistance limit tests is crucial for ensuring building fire safety and protecting people's lives and property. With the acceleration of urbanization and the emergence of complex architectural forms such as high-rise buildings and large complexes, higher fire safety requirements are being placed on the market. Therefore, rigorous fire resistance limit testing of fireproof materials is a crucial measure to ensure building fire safety and protect people's lives and property.

[0041] In summary, the fire resistance limit test tests building components or materials by simulating fire conditions, evaluates their fire resistance performance in fire, and ensures that they meet safety standards, thereby providing protection for public safety.

[0042] During the fire resistance limit test of building components or materials, the samples are subjected to high temperature burning, which will release toxic and harmful smoke and pollute the environment. Therefore, a smoke hood is usually used to collect the smoke to avoid the spread of toxic and harmful smoke. Conventional smoke hoods are fixed and difficult to adapt to test samples of different sizes. Moreover, it is not convenient to install and disassemble the test samples before and after use. The smoke hood provided in the present application comprises a first cover body and a second cover body, the first cover body is plugged into the second cover body, the flue assembly comprises an outer pipe and an inner pipe, the inner pipe is plugged into the outer pipe, and when the first cover body and the second cover body move relative to each other, the outer pipe and the inner pipe can move synchronously relative to each other, thereby adjusting the overall length of the smoke hood so that it can be used with test samples of different sizes. Moreover, before and after use, the second cover body can be moved to the upper part of the combustion furnace without blocking the position of the furnace door of the combustion furnace, which is convenient for the installation and disassembly of the test samples.

[0043] The specific structure of the smoke collection hood provided in this application is described in detail below with reference to the accompanying drawings.

[0044] Reference Figures 1-4 As shown, an embodiment of the present application provides a smoke collecting hood, comprising a hood body 10 and a flue assembly 20 and a first moving mechanism 30 provided on the hood body 10;

[0045] The cover body 10 includes a first cover body 11 and a second cover body 12. The first cover body 11 and the second cover body 12 are both square cylindrical covers with open ends at the bottom and front and rear ends. The first cover body 11 and the second cover body 12 respectively cover the front and rear sides of the combustion furnace. A furnace door is provided at the front end of the combustion furnace. The second cover body 12 is sleeved on the front part of the first cover body 11.

[0046] A plurality of flue assemblies 20 are provided in the cover body 10. The flue assemblies 20 extend in the front-to-back direction and are evenly distributed in the left-to-right direction in the cover body 10. The flue assemblies 20 include an outer pipe 21 and an inner pipe 22. Both the outer pipe 21 and the inner pipe 22 are metal pipes. The outer pipe 21 is fixed to the top of the first cover body 11, and the inner pipe 22 is provided at the top of the second cover body 12. The rear end of the inner pipe 22 is inserted into the outer pipe 21, and the front end of the inner pipe 22 is fixed to the end of the second cover body 12 away from the first cover body 11, that is, the front end of the inner pipe 22 is fixed to the front end of the second cover body 12. A plurality of smoking ports 23 are provided on the inner pipe 22. The smoking ports 23 can be square through holes, and the smoking ports 23 are arranged vertically downward.

[0047] The first moving mechanism 30 is disposed at the bottom end of the second cover body 12 , and the movement direction of the first moving mechanism 30 is consistent with the sleeve connection direction of the second cover body 12 and the first cover body 11 .

[0048] The smoke collecting hood provided in the embodiment of the present application includes a hood body 10 and a flue assembly 20 provided on the hood body 10. The hood body 10 and the flue assembly 20 are both made of high-temperature resistant materials and can withstand temperatures above 500°C.

[0049] The cover body 10 includes a first cover body 11 and a second cover body 12. The first cover body 11 is plugged into the second cover body 12. At least a portion of the first cover body 11 is located in the second cover body 12. The flue assembly 20 includes an outer pipe 21 and an inner pipe 22. The outer pipe 21 is fixed in the first cover body 11. The inner pipe 22 is arranged in the second cover body 12. The first end of the inner pipe 22 is plugged into the outer pipe 21. The second end of the inner pipe 22 is fixed to the end of the second cover body 12 away from the first cover body 11. A plurality of smoking ports 23 are provided on the inner pipe 22. A moving mechanism is provided at the bottom end of the second cover body 12. The movement direction of the first moving mechanism is consistent with the socket direction of the second cover body 12 and the first cover body 11. When the first cover body 11 and the second cover body 12 move relative to each other, the outer pipe 21 and the inner pipe 22 can move synchronously relative to each other, thereby adjusting the overall length of the smoke hood so that it can be used with test samples of different sizes. Moreover, before and after use, the second cover body 12 can be moved to the upper part of the combustion furnace without blocking the position of the furnace door of the combustion furnace, thereby facilitating the installation and disassembly of the test samples.

[0050] Reference Figure 1 and Figure 2 As shown, in some embodiments, the fume hood further includes a second moving mechanism 40;

[0051] The second moving mechanism 40 is disposed at the bottom end of the first cover body 11 , and the movement direction of the second moving mechanism 40 is consistent with the sleeve connection direction of the second cover body 12 and the first cover body 11 .

[0052] The first moving mechanism 30 includes rollers 31 , and a plurality of rollers 31 are evenly distributed at the bottom end of the second cover 12 , and the second cover 12 moves back and forth via the plurality of rollers 31 ;

[0053] The second moving mechanism 40 includes a guide rail 41 and a slider 42. The guide rail 41 extends in the front-to-back direction. The two guide rails 41 are laid parallel to the left and right sides of the combustion furnace. A plurality of sliders 42 are evenly provided at the bottom ends of the left and right sides of the first cover body 11. The plurality of sliders 42 are slidably connected to the guide rail 41 on the same side to realize the front-to-back movement of the first cover body 11.

[0054] Reference Figure 1 As shown, in some embodiments, the fume hood further includes a collection pipe 50, a hose 60, and an environmental protection device 70;

[0055] The collecting pipe 50 is fixed to the rear end outer wall of the first cover body 11, and multiple external pipes 21 pass through the first cover body 11 and are connected to the collecting pipe 50. The collecting pipe 50 is connected to the environmental protection equipment 70 through a hose 60. A fan is provided on the hose 60, and the toxic and harmful gases are sucked into the environmental protection equipment 70 through the fan, thereby purifying the flue gas.

[0056] Reference Figure 1 and Figure 2 As shown, in some embodiments, the smoke hood further includes a lifting and shielding mechanism 80;

[0057] The end of the second cover 12 away from the first cover 11 is an open sample connection end, that is, the front end of the second cover 12 is the sample connection end, and the lifting shielding mechanism 80 is fixedly installed on the top of the sample connection end;

[0058] The lifting and shielding mechanism 80 is an electric rolling shutter door, which can be raised and lowered according to the test sample to seal the upper space of the sample connection end and collect smoke and dust.

[0059] Reference Figure 1 and Figure 2 As shown, in some embodiments, one end of the first cover body 11 away from the second cover body 12 is an open avoidance end, that is, the rear end of the first cover body 11 is the avoidance end, and the combustion furnace passes through the avoidance end of the first cover body 11, so as to facilitate use with a larger combustion furnace;

[0060] like Figure 1 As shown, a tripod is provided on the top of the avoidance end, thereby improving the structural strength of the first cover body 11.

[0061] Reference Figure 3 and Figure 4 As shown, in some embodiments, slide rails 24 are provided at both upper and lower ends of the inner wall of the outer pipe 21, and the slide rails 24 extend forward and backward, and slide grooves 25 are provided at both ends of the outer wall of the inner pipe 22;

[0062] The outer wall of the slide rail 24 is slidably connected to the inner wall of the slide groove 25 , thereby facilitating the plugging of the inner pipe 22 and the outer pipe 21 .

[0063] Reference Figure 3 As shown, in some embodiments, the inner wall of the first cover body 11 is provided with a supporting frame 26, the supporting frame 26 is located at the lower part of the outer pipe 21, the supporting frame 26 is arranged horizontally, and multiple supporting frames 26 support the outer pipe 21;

[0064] The load-bearing frame 26 includes two transverse rods and multiple longitudinal rods. The two transverse rods are arranged in parallel and extend in the left-right direction. The ends of the transverse rods are connected to the left and right inner walls of the first cover 11. The longitudinal rods extend in the front-to-back direction. The multiple longitudinal rods are evenly distributed between the two transverse rods. The ends of the longitudinal rods are fixedly connected to the outer walls of the two transverse rods respectively.

[0065] The outer pipe 21 is fixed on the transverse rod body and the longitudinal rod body, so that the outer pipe 21 is stably fixed.

[0066] In some embodiments, a fixing member 27 is provided at the top of the front end of the second cover body 12, the rear end of the inner pipe 22 is plugged into the outer pipe 21, and the front end of the inner pipe 22 is fixed to the fixing member 27;

[0067] The fixing member 27 includes a top plate and a connecting plate. The top plate is fixed to the top of the second cover body 12 by screws, and the connecting plate is fixed to the top plate. The connecting plate is vertically arranged, and the front end of the inner pipe 22 is fixedly connected to the rear surface of the connecting plate, so that the inner pipe 22 is fixedly connected to the second cover body 12, so that the inner pipe 22 moves back and forth synchronously with the second cover body 12.

[0068] In some embodiments, the smoke hood also includes a sealing strip brush 90, which is fixed to the inner wall of the second cover body 12, and the inner end of the sealing strip brush 90 is in contact with the outer wall of the first cover body 11; the sealing strip brush 90 is in an inverted U shape, consisting of a steel belt and bristles, the steel belt is fixed to the inner wall of the second cover body 12, the bristles are fixed to the inner wall of the steel belt, and the inner end of the bristles is in contact with the outer wall of the first cover body 11, thereby improving the sealing of the cover body 10 and preventing toxic and harmful gases from overflowing from the gap between the first cover body 11 and the second cover body 12.

[0069] According to the above technical features, the working principle of the smoke hood provided by this application in actual application scenarios is:

[0070] Before the test, the second cover body 12 moves backward via a plurality of rollers 31, and the inner pipe 22 is fixedly connected to the second cover body 12 and moves synchronously. The inner pipe 22 is inserted into the outer pipe 21, and the second cover body 12 moves to the upper part of the combustion furnace, not blocking the furnace door at the front end of the combustion furnace, which is convenient for installing the sample; after the sample is installed, the second cover body 12 moves forward, and the inner pipe 22 partially extends out of the outer pipe 21, and the second cover body 12 blocks the front end of the combustion furnace; according to the height of the sample, the roller shutter is raised and lowered so that the bottom end of the electric roller shutter door is close to the sample, thereby sealing the upper space of the sample connection end, which is conducive to collecting smoke and dust;

[0071] When in use, the fan is turned on, and the toxic and harmful smoke generated by combustion enters the inner pipe 22 through the multiple smoke outlets 23, and then flows through the inner pipe 22, the outer pipe 21, the collection pipe 50 and the hose 60 in sequence into the environmental protection device 70, and the environmental protection device 70 purifies the toxic and harmful smoke;

[0072] After use, the second cover body 12 moves backwards without blocking the furnace door at the front end of the combustion furnace, making it easy to remove the sample.

[0073] It is easy to understand that those skilled in the art can combine, split, reorganize, etc. the embodiments of the present application based on the several embodiments provided in the present application to obtain other embodiments, and these embodiments do not exceed the scope of protection of the present application.

[0074] The above specific implementation methods further explain in detail the purpose, technical solutions and beneficial effects of the embodiments of the present application. It should be understood that the above are only specific implementation methods of the embodiments of the present application and are not intended to limit the scope of protection of the embodiments of the present application. Any modifications, equivalent replacements, improvements, etc. made on the basis of the technical solutions of the embodiments of the present application should be included in the scope of protection of the embodiments of the present application.

Claims

1. A smoke collecting hood covering a combustion furnace, characterized in that: It comprises a cover body (10), a flue assembly (20) and a first moving mechanism (30) arranged on the cover body (10); The cover body (10) comprises a first cover body (11) and a second cover body (12), wherein the first cover body (11) and the second cover body (12) respectively cover two sides of the combustion furnace, and the second cover body (12) is sleeved on the first cover body (11); The flue assembly (20) comprises an outer pipe (21) and an inner pipe (22), wherein the outer pipe (21) is fixedly arranged on the top of the first cover body (11), and the inner pipe (22) is arranged on the top of the second cover body (12), a first end of the inner pipe (22) is inserted into the outer pipe (21), and a second end of the inner pipe (22) is fixed to the end of the second cover body (12) away from the first cover body (11), and a plurality of smoking ports (23) are provided on the inner pipe (22); The first moving mechanism (30) is arranged at the bottom end of the second cover body (12), and the movement direction of the first moving mechanism (30) is consistent with the sleeve connection direction of the second cover body (12) and the first cover body (11).

2. The smoke collecting hood according to claim 1, characterized in that: The smoke collecting hood further comprises a second moving mechanism (40); The second moving mechanism (40) is arranged at the bottom end of the first cover body (11), and the movement direction of the second moving mechanism (40) is consistent with the sleeve connection direction of the second cover body (12) and the first cover body (11).

3. The smoke collecting hood according to claim 2, characterized in that: The first moving mechanism (30) includes a roller (31), and a plurality of the rollers (31) are evenly distributed at the bottom end of the second cover (12); The second moving mechanism (40) includes a guide rail (41) and a slider (42), wherein the two guide rails (41) are laid in parallel on both sides of the combustion furnace, and a plurality of sliders (42) are evenly provided at the bottom end of the first cover body (11), and the plurality of sliders (42) are slidably connected to the guide rail (41) on the same side.

4. The smoke collecting hood according to claim 1, wherein: The smoke hood further includes a collection pipe (50), a hose (60) and an environmental protection device (70); The collecting pipe (50) is fixed to the outer wall of the first cover (11), and the plurality of outer pipes (21) pass through the first cover (11) and are connected to the collecting pipe (50). The collecting pipe (50) is connected to the environmental protection equipment (70) through the hose (60).

5. The fume hood according to claim 1, wherein: The smoke collecting hood further comprises a lifting and shielding mechanism (80); One end of the second cover body (12) away from the first cover body (11) is an open sample connection end, and the lifting shielding mechanism (80) is fixedly arranged on the top of the sample connection end; The lifting and shielding mechanism (80) is an electric rolling door.

6. The fume hood according to claim 5, characterized in that: One end of the first cover body (11) away from the second cover body (12) is an open avoidance end, and the combustion furnace passes through the avoidance end of the first cover body (11); A tripod is provided on the top of the avoidance end.

7. The fume hood according to claim 1, characterized in that: Both ends of the inner wall of the outer pipe (21) are provided with slide rails (24), and both ends of the outer wall of the inner pipe (22) are provided with slide grooves (25); The outer wall of the slide rail (24) is slidably connected to the inner wall of the slide groove (25).

8. The fume hood according to claim 7, characterized in that: The inner wall of the first cover body (11) is provided with a bearing frame (26), and a plurality of the bearing frames (26) support the outer pipe (21); The load-bearing frame (26) includes two transverse rods and a plurality of longitudinal rods, the two transverse rods are arranged in parallel, the two ends of the transverse rods are connected to the inner walls of both sides of the first cover (11), the plurality of longitudinal rods are evenly distributed between the two transverse rods, and the two ends of the longitudinal rods are respectively fixedly connected to the outer walls of the two transverse rods; The outer pipe (21) is fixed on the transverse rod body and the longitudinal rod body.

9. The fume hood according to claim 7, characterized in that: A fixing member (27) is provided on the top of the second cover body (12), and the second end of the inner pipe (22) is fixed on the fixing member (27); The fixing member (27) includes a top plate and a connecting plate, the top plate is fixed on the top of the second cover (12), the connecting plate is fixed on the top plate, and the second end of the inner pipe (22) is fixedly connected to the connecting plate.

10. The fume hood according to claim 1, characterized in that: The smoke collecting hood further comprises a sealing strip brush (90); The sealing strip brush (90) is fixed to the inner wall of the second cover body (12), and the inner end of the sealing strip brush (90) is in contact with the outer wall of the first cover body (11).

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