Laboratory exhaust system
By designing a rotatable laboratory exhaust system, the problem of low disassembly efficiency of short-term test equipment was solved, enabling rapid connection and separation, improving disassembly efficiency while maintaining airtightness and exhaust efficiency.
Patent Information
- Application Number
- CN202521746310.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-18
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-08-18
AI Technical Summary
In existing technologies, the disassembly of experimental equipment that enters the laboratory for a short period of time is inefficient and requires separation from the ventilation system by cutting or other means, which is time-consuming and labor-intensive.
A laboratory exhaust system was designed, including an air intake structure, a first exhaust bend, a rotating device, and a first exhaust branch pipe. The rotating device enables the air inlet of the air intake structure to be quickly aligned and separated from the exhaust outlet of the test equipment. A sealed connection is achieved using a 360° rotatable rolling bearing and a tapered connection.
It improves the efficiency of disassembling test equipment, saves manpower and resources, and requires no additional disassembly work, thus maintaining the airtightness and ventilation efficiency of the system.
Smart Images
Figure CN224680907U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of laboratory ventilation design, specifically, it relates to a laboratory ventilation system. Background Technology
[0002] Laboratory exhaust ducts are the core component of safe ventilation in the entire laboratory. In traditional laboratories, exhaust ducts are usually designed from the initial bird's-eye view. Basically, wherever there is a need for ventilation, an exhaust branch pipe is connected to the bottom. The exhaust branch pipe extends upward and then turns to connect to the main exhaust pipe. After the main exhaust pipe connects to various exhaust branch pipes, the exhaust pipe then discharges the air that needs to be exhausted. The exhaust fan at the end or middle of the entire ventilation system discharges the toxic and harmful gases in the laboratory into the activated carbon box for filtration. After meeting the national emission standards, the exhaust is treated.
[0003] However, some laboratory equipment is installed later in the process, and its exhaust design was not considered during the initial design phase. Therefore, the exhaust system needs to be redesigned for this later-installed equipment. However, this later-installed equipment is not intended for long-term use in the laboratory. In current technology, for such short-term laboratory equipment, the exhaust vent is often fixedly connected to the exhaust system's inlet, for example, by welding. This means that when the equipment needs to be moved out of the laboratory, it is necessary to separate the exhaust vent from the exhaust system's inlet using cutting or other methods, which is time-consuming and labor-intensive. Utility Model Content
[0004] The purpose of this invention is to overcome the shortcomings of existing technologies, such as low efficiency in disassembling experimental equipment that is only used in the laboratory for short periods of time, and to provide a laboratory ventilation system.
[0005] To achieve the above-mentioned objectives, this utility model provides the following technical solution:
[0006] A laboratory exhaust system includes an air intake structure, a first exhaust bend, a rotating device, a first exhaust branch pipe, and a second exhaust bend.
[0007] The suction structure is shaped like a flat dustpan;
[0008] The rotating device includes a coaxial rotating part and a fixed part;
[0009] The air outlet of the suction structure, the first exhaust bend, and the rotating part are connected in sequence. The fixing part is connected to the air inlet of the first exhaust branch pipe. The air inlet of the second exhaust bend pipe is vertically sleeved on the air outlet of the first exhaust branch pipe. The air outlet of the first exhaust branch pipe is tapered with a smaller top and a larger bottom, and a first rubber pad is fixed on its surface. The air inlet of the second exhaust bend pipe is also tapered with a smaller top and a larger bottom. The sum of the lower outer diameter of the air outlet of the first exhaust branch pipe and the thickness of the first rubber pad is less than the lower inner diameter of the air inlet of the second exhaust bend pipe, but greater than the upper inner diameter of the air inlet of the second exhaust bend pipe. The cone angle of the air outlet of the first exhaust branch pipe and the cone angle of the air inlet of the second exhaust bend pipe are the same.
[0010] Preferably, the rotation angle of the rotating device is 360°.
[0011] Preferably, both the first exhaust bend and the second exhaust bend are Z-shaped.
[0012] Preferably, the first exhaust bend has a first inspection port covered with a first transparent glass; the first exhaust branch has a second inspection port covered with a second transparent glass.
[0013] Preferably, it further includes a fixing member for fixing the first transparent glass to the first exhaust bend and the second transparent glass to the first exhaust branch pipe.
[0014] Preferably, the first exhaust branch pipe is formed by sequentially connecting a first exhaust straight pipe, several sections of bamboo-joint exhaust branch pipes, and a second exhaust straight pipe.
[0015] Preferably, the inner surfaces of the suction structure, the first exhaust bend, the rotating device, the first exhaust branch pipe, and the second exhaust bend are all covered with a Teflon coating.
[0016] Preferably, the second exhaust bend includes a first bend joint, a third exhaust straight pipe, a third flange, a fourth flange, a fourth exhaust straight pipe, and a second bend joint connected in sequence. The air inlet of the first bend joint serves as the air inlet of the second exhaust bend, and the air outlet of the second bend joint serves as the air outlet of the second exhaust bend.
[0017] Preferably, it also includes an exhaust hose, which serves as a length compensation pipe.
[0018] Preferably, it further includes a fixing structure for fixing the first exhaust bend.
[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0020] This invention connects the air outlet of the first exhaust bend pipe to the rotating part of the rotating device, and the air inlet of the first exhaust branch pipe to the rotating part of the rotating device. Thus, when it is necessary to align the air inlet of the suction structure with the exhaust outlet of the test equipment, this can be achieved by moving the rotating part or the first exhaust bend pipe to drive the suction structure. When it is necessary to separate the air inlet of the suction structure from the exhaust outlet of the test equipment, this can also be achieved by moving the rotating part or the first exhaust bend pipe to drive the suction structure. This improves disassembly efficiency and saves manpower and resources. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of a laboratory exhaust system disclosed in one embodiment;
[0022] Figure 2 This is a schematic diagram of a laboratory exhaust system in which the rotating device is a rolling bearing, as disclosed in one embodiment.
[0023] Figure 3 This is a schematic diagram of the cone angle of the outlet of the first exhaust branch pipe in a laboratory exhaust system disclosed in one embodiment;
[0024] Figure 4 This is a schematic diagram of the cone angle of the air inlet of the second exhaust bend in a laboratory exhaust system disclosed in one embodiment;
[0025] Figure 5 This is a schematic diagram of a laboratory exhaust system including an access port, as disclosed in one embodiment.
[0026] Figure 6 This is a schematic diagram of the structure of the first exhaust branch pipe of a laboratory exhaust system disclosed in one embodiment;
[0027] Figure 7 This is a schematic diagram of the structure of the second exhaust bend of a laboratory exhaust system disclosed in one embodiment.
[0028] Label Explanation:
[0029] 10 - Suction structure; 20 - First exhaust bend; 201 - First inspection port; 202 - Third bend connector; 203 - Fifth exhaust straight pipe; 204 - Fourth bend connector; 30 - Rotating device; 301 - Rotating part; 302 - Fixed part; 303 - Ball bearing; 40 - First exhaust branch pipe; 401 - Second inspection port; 402 - First exhaust straight pipe; 403 - First bamboo-joint exhaust branch pipe; 404 - Second bamboo-joint exhaust branch pipe; 405 - Third bamboo-joint exhaust branch pipe; 406 - Fourth bamboo-joint exhaust branch pipe; 407-Flange; 408-Second exhaust straight pipe; 409-Air outlet of the first exhaust branch pipe; 50-Second exhaust elbow; 501-First elbow joint; 502-Third exhaust straight pipe; 503-Third flange; 504-Fourth exhaust straight pipe; 505-Second elbow joint; 506-Air inlet of the second exhaust elbow; 507-Fourth flange; 60-First transparent glass; 70-Second transparent glass; 80-Fixing component; 90-First rubber gasket. Detailed Implementation
[0030] like Figure 1 and Figure 2 As shown, this embodiment provides a laboratory exhaust system, including an air intake structure 10, a first exhaust bend 20, a rotating device 30, a first exhaust branch pipe 40, and a second exhaust bend 50; the air intake structure 10 is shaped like a flat sieve; the rotating device 30 includes a coaxial rotating part 301 and a fixing part 302; the air outlet of the air intake structure 10, the first exhaust bend 20, and the rotating part 301 are sequentially connected; the fixing part 302 is connected to the air inlet of the first exhaust branch pipe 40; the air inlet 506 of the second exhaust bend 50 is vertically sleeved on the air outlet 409 of the first exhaust branch pipe 40, as shown. Figure 3 As shown, the air outlet 409 of the first exhaust branch pipe 40 is tapered, wider at the bottom than the top, and a first rubber pad 90 is fixed to its surface. Figure 4 As shown, the air inlet 506 of the second exhaust bend 50 is tapered, with a smaller top and a larger bottom. The sum of the lower outer diameter of the air outlet 409 of the first exhaust branch 40 and the thickness of the first rubber pad 90 is less than the lower inner diameter of the air inlet 506 of the second exhaust bend 50, but greater than the upper inner diameter of the air inlet 506 of the second exhaust bend 50. Figure 3 and Figure 4As shown, the cone angle a1 of the air outlet 409 of the first exhaust branch pipe 40 and the cone angle a2 of the air inlet 506 of the second exhaust bend 50 are the same. The rotation angle of the rotating device 30 is 360°. The rotating device 30 can be a rolling bearing with a sealing sleeve. The outer ring of the rolling bearing is the fixed part 302 of the rotating device 30, and the inner ring of the rolling bearing is the rotating part 301 of the rotating device 30. The rolling bearing also includes balls 303, which are located between the outer and inner rings of the rolling bearing. The specific model of the rolling bearing can be NSK6306 DDU or NSK6306 ZZ. When it is necessary to change the direction of the suction structure 10, it can be achieved by turning the first exhaust bend 20 or the suction structure 10.
[0031] Specifically, the suction structure 10 is designed in a flat, scoop-like shape to efficiently capture horizontally diffused pollutants (such as chemical gases and dust), reducing airflow escape. The specific lengths and curvatures of the first exhaust bend 20, the first exhaust branch 40, and the second exhaust bend 50 can be determined according to the specific conditions in the laboratory. The air inlet 506 of the second exhaust bend 50 is vertically connected to the air outlet 409 of the first exhaust branch 40 to ensure that the second exhaust bend 50 is in a movable state, thereby allowing air to pass through the air outlet of the second exhaust bend 50. When it is necessary to connect with the existing exhaust main pipe of the laboratory, simply loosen the connection between the second exhaust bend 50 and the first exhaust branch pipe 40, and move the second exhaust bend 50 so that its air outlet is aligned with the air inlet of the exhaust main pipe. When it is necessary to inspect or check the internal condition of the exhaust main pipe of the existing laboratory exhaust system, loosen the connection between the second exhaust bend 50 and the first exhaust branch pipe 40, and move the second exhaust bend 50 so that its air outlet is misaligned with the air inlet of the exhaust main pipe. This can be done without any additional disassembly work, making it simple and efficient.
[0032] Furthermore, the outlet 409 of the first exhaust branch pipe 40 is shaped as a cone, smaller at the top and larger at the bottom, and a first rubber pad 90 is fixed to its surface. The inlet 506 of the second exhaust bend 50 is also shaped as a cone, smaller at the top and larger at the bottom. The sum of the lower outer diameter of the outlet 409 of the first exhaust branch pipe 40 and the thickness of the first rubber pad 90 is less than the lower inner diameter of the inlet 506 of the second exhaust bend 50, but greater than the upper inner diameter of the inlet 506 of the second exhaust bend 50. Additionally, the cone angle α1 of the outlet 409 of the first exhaust branch pipe 40 and the cone angle α2 of the inlet 506 of the second exhaust bend 50 are also present. Similarly, the air outlet 409 of the first exhaust branch pipe 40 and the air inlet 506 of the second exhaust bend 50 can be sealed by the weight of the second exhaust bend 50. That is, the air inlet 506 of the second exhaust bend 50 presses against the first rubber pad 90 on the surface of the air outlet 409 of the first exhaust branch pipe 40. Since the cone angle α1 of the air outlet 409 of the first exhaust branch pipe 40 and the cone angle α2 of the air inlet 506 of the second exhaust bend 50 are the same, under the action of gravity, the air outlet 409 of the first exhaust branch pipe 40 and the air inlet 506 of the second exhaust bend 50 will fit tightly together, thus achieving a seal. Furthermore, Figure 3 and Figure 4 In the diagram, the gray lines at cone angles a1 and a2 do not exist; they are merely auxiliary lines drawn to represent cone angles a1 and a2. The range of cone angles a1 and a2 is between 0° and 90°, excluding 0° and 90°, and specifically between 10° and 20°.
[0033] When the exhaust system of this embodiment needs to be disassembled, since the first exhaust branch pipe 40 and the second exhaust bend pipe 50 are not fixedly connected, they can be directly removed without additional disassembly work. Simultaneously, the exhaust system utilizes the exhaust fan of the existing laboratory exhaust system. The exhaust fan is installed in the middle or end of the main exhaust pipe; it is activated when exhaust is needed. Because the inner ring of the rolling bearing is connected to the outlet of the first exhaust bend pipe 20, and the outer ring of the rolling bearing is connected to the inlet of the first exhaust branch pipe 40, a negative pressure is created in the first exhaust branch pipe 40 when the exhaust fan is activated. This means the pressure in the laboratory is greater than the pressure inside the first exhaust branch pipe 40, preventing gas in the laboratory from escaping through the gap between the inner and outer rings of the rolling bearing, thus ensuring good airtightness of the exhaust system.
[0034] Furthermore, to ensure that the first exhaust bend 20 can be fixed at any angle, fixing structures (not shown in the figure) are respectively set on opposite sides near the first exhaust branch pipe 20. For example, the fixing structure includes a fixing rod and a fixing rope. The fixing rod is fixed to the ground, and one end of the fixing rope is fixed to the fixing rod. The fixing rope is not elastic. When it is necessary to fix the first exhaust bend 20, the other end of the fixing rope is fixed to the first exhaust bend 20. Since fixing structures are set on opposite sides, there is an equal and opposite pulling force in the same direction, which makes the first exhaust bend 20 fixed. In fact, the fixing structure acts as a limiting structure. When it is necessary to change the direction of the suction structure 10, it is achieved by moving the suction structure 10 or the first exhaust bend 20. In order to fix the suction structure 10 at the position after the change of direction, the fixing structure is used to prevent the direction of the suction structure 10 from changing.
[0035] Furthermore, such as Figure 1 As shown, both the first exhaust bend 20 and the second exhaust bend 50 are Z-shaped. The gradual turning of the Z-shaped bend is gentler than that of a single right-angle bend, which can reduce turbulence and pressure loss caused by sudden airflow turning and maintain exhaust efficiency. Multiple consecutive bends can disperse airflow impact, avoid local eddies (especially during high-speed exhaust), and reduce pipe vibration and noise. The Z-shaped bend can achieve pipe lifting or horizontal displacement within a limited height, avoiding the occupation of too much vertical space. Laboratories often need to bypass walls, instruments, or other pipes, and the Z-shaped bend is easier to adjust its direction than a single bend. When the airflow turns multiple times in the Z-shaped bend, heavier particles (such as dust and droplets) will impact the pipe wall due to inertia and settle. Compared with long straight pipes, the Z-shaped bend can break the straight trajectory of particles and reduce the risk of continuous contamination on the inner wall of the pipe.
[0036] Furthermore, such as Figure 5 As shown, the first exhaust bend 20 is provided with a first inspection port 201, the surface of which is covered with a first transparent glass 60; the first exhaust branch 40 is provided with a second inspection port 401, the surface of which is covered with a second transparent glass 70. The transparent glass allows direct observation of the airflow conditions inside the duct (such as whether it is unobstructed, whether there is pollutant deposition or dust, or condensate accumulation) or mechanical damage (such as corrosion or deformation) without disassembling the duct. Specifically, the first exhaust bend 20 includes a third bend connector 202, a fifth exhaust straight duct 203, and a fourth bend connector 204 connected in sequence. The bends of the third bend connector 202 and the fourth bend connector 204 are in opposite directions, thus forming a Z-shaped first exhaust bend 20.
[0037] Furthermore, such as Figure 5As shown, a laboratory exhaust system also includes a fixing member 80, which is used to fix the first transparent glass 60 to the first exhaust bend 20 and the second transparent glass 70 to the first exhaust branch 40. The fixing member 80 can be a clamp, which is respectively fitted onto the two ends of the first transparent glass 60 and the second transparent glass 70 and fastened with screws. Figure 5 This is a front view of the ventilation system, not a sectional view.
[0038] Furthermore, such as Figure 6 As shown, the first exhaust branch pipe 40 is formed by sequentially connecting a first exhaust straight pipe 402, several sections of bamboo-joint exhaust branch pipes, and a second exhaust straight pipe 408. Specifically, the first exhaust branch pipe 40 is formed by sequentially connecting a first exhaust straight pipe 402, a first bamboo-joint exhaust branch pipe 403, a second bamboo-joint exhaust branch pipe 404, a third bamboo-joint exhaust branch pipe 405, a fourth bamboo-joint exhaust branch pipe 406, a flange 407, and a second exhaust straight pipe 408. The shape of the first exhaust branch pipe 40 is determined according to the actual situation. The flange 407 includes a first flange and a second flange. Both the first flange and the second flange have threaded holes on their flange plates. The holes are mirror-symmetrical. One end of the first flange is connected to the air outlet of the fourth bamboo-type exhaust branch pipe 406. The other end of the first flange is fastened to one end of the second flange by bolts. A second rubber gasket is provided between the first flange and the second flange. The second rubber gasket has holes that are mirror-symmetrical to the threaded holes on the first flange. The other end of the second flange is connected to the air inlet of the second exhaust straight pipe 408. The function of the second rubber gasket is to ensure good airtightness between the first flange and the second flange. The connection is achieved by using two flanges to make it more convenient when the exhaust system needs to be disassembled (the first flange, the second flange, the second rubber gasket, and the bolts are not shown in the figure).
[0039] The connection method between the first bamboo-joint exhaust branch pipe 403, the second bamboo-joint exhaust branch pipe 404, the third bamboo-joint exhaust branch pipe 405, and the fourth bamboo-joint exhaust branch pipe 406 can be existing, such as vertically sleeved and fixed by snap fasteners. Specifically, the length of each bamboo-joint exhaust branch pipe is 50cm. The inner diameter of the bamboo-joint exhaust branch pipe within 2cm from the air inlet to the air outlet is 20.5cm, and the pipe wall thickness is 1.5cm. The inner diameter of the bamboo-joint exhaust branch pipe from 2cm to 50cm is 20cm. The inner diameter of the bamboo-joint exhaust branch pipe from 2cm to 47.5cm is... All bamboo-joint exhaust branch pipes have a wall thickness of 2cm. The wall thickness of the branch pipes between 47.5cm and 50cm is 0.5cm, meaning the inner diameter of the outlet is 20cm and the outer diameter is 20.5cm. Furthermore, when connecting multiple bamboo-joint exhaust branch pipes, a 0.5cm thick rubber sealing ring is installed 47.5cm from the inlet to the outlet of each branch pipe. The inner diameter of the rubber sealing ring is 20cm and the outer diameter is 22cm. The inlet of the upper bamboo-joint exhaust branch pipe is vertically fitted onto the outlet of the lower bamboo-joint exhaust branch pipe. The specific numerical relationships of the length, diameter, and wall thickness of the bamboo-joint exhaust branch pipes, as well as the inner diameter, outer diameter, and thickness of the rubber sealing ring, are not limited to those shown above and can be selected according to actual conditions.
[0040] Additionally, snaps are installed on the outer surface near the air outlet of each bamboo-joint exhaust branch pipe, with matching collars on the snaps. Raised slots are installed on the outer surface near the air inlet of each bamboo-joint exhaust branch pipe. When it is necessary to secure multiple connected bamboo-joint exhaust branch pipes, the collars of the snaps are sequentially engaged in the slots, and the snaps are pressed down firmly to secure the bamboo-joint exhaust branch pipes. For disassembly, simply lift the snaps upwards for quick removal, similar to the snap-lock system on suitcases. The number of snaps and slots on the outer surface of each bamboo-joint exhaust branch pipe section depends on the actual situation. There can be two of each, distributed on opposite sides. This ensures that the force on the bamboo-joint exhaust branch pipe is balanced when it is fixed by the snaps. The spacing between the snaps and slots needs to take into account the thickness of the rubber sealing ring at the connection point of adjacent bamboo-joint exhaust branch pipes when multiple bamboo-joint exhaust branch pipe sections are connected, so that the airtightness of the bamboo-joint exhaust branch pipe is better when the collar is locked in the slot (the snaps, collars, and slots are not shown in the figure).
[0041] When the length of the first exhaust branch pipe 40 needs to be adjusted, the number of bamboo-joint exhaust branch pipes can be adjusted, which can be applied to test equipment of different heights, enhancing the flexibility of the exhaust system. A second maintenance port 401 is opened on the first exhaust straight pipe 402, and the first exhaust branch pipe 40 is fixed by a bracket. Specifically, one end of the bracket is fixedly connected to one end of the first exhaust branch pipe 40, and the other end is fixed to the ceiling. As mentioned above, when the rotating device 30 is a rolling bearing with a sealing sleeve, the outer ring of the rolling bearing is used as the fixed part 302. In fact, this fixed part 302 does not mean that the outer ring of the rolling bearing is fixed. Both the outer ring and the inner ring of the rolling bearing can rotate. The reason why the outer ring of the rolling bearing is used as the fixed part 302 is because the first exhaust branch pipe 40 is fixed by the bracket, and the first exhaust branch pipe 40 is connected to the outer ring of the rolling bearing in a fixed manner. Generally, the air inlet of the first exhaust branch pipe 40 is sealed and welded to the outer ring of the rolling bearing, so the outer ring of the rolling bearing will not rotate, hence the name fixed part 302.
[0042] Furthermore, the inner surfaces of the suction structure 10, the first exhaust bend 20, the rotating device 30, the first exhaust branch pipe 40, and the second exhaust bend 50 are all covered with a Teflon coating. The Teflon coating has a smooth surface and is hydrophobic and oleophobic, effectively preventing the adhesion of sticky contaminants such as dust, resin, and oil mist, reducing the risk of pipe blockage. High-speed airflow can more easily flush away deposits on the inner wall, reducing maintenance frequency (e.g., viscous chemical vapors easily detach after condensation and do not cake). The Teflon coating has an extremely low coefficient of friction (approximately 0.04), significantly reducing the frictional resistance between the airflow and the pipe wall, maintaining exhaust efficiency, and reducing energy consumption. Teflon has extremely strong inertness to most chemical substances (such as concentrated sulfuric acid, hydrochloric acid, and organic solvents), preventing the inner wall of the pipe from being corroded by corrosive gases or condensates, extending the pipe's lifespan.
[0043] Furthermore, such as Figure 7As shown, the second exhaust bend 50 includes a first bend joint 501, a third exhaust straight pipe 502, a third flange 503, a fourth flange 507, a fourth exhaust straight pipe 504, and a second bend joint 505 connected in sequence. The air inlet of the first bend joint 501 serves as the air inlet 506 of the second exhaust bend 50, and the air outlet of the second bend joint 505 serves as the air outlet of the second exhaust bend 50. When the exhaust system needs to be adapted to other testing equipment, if the current exhaust duct is too long and reducing the number of bamboo-type exhaust branch pipes cannot achieve a suitable length, a certain length of the third exhaust straight pipe 502 can be cut and then connected to the third flange 503, or a certain length of the fourth exhaust straight pipe 504 can be cut and then connected to the fourth flange 507. Both the flanges of the third flange 503 and the fourth flange 507 have threaded holes, and these threaded holes are mirror-symmetrical. They are fastened with bolts, and a third rubber gasket is provided between them to ensure airtightness. The holes on the third rubber gasket are mirror-symmetrical to the threaded holes on the flange of the third flange 503. Using two flanges for connection makes disassembly of the exhaust system easier. Additionally, due to cutting precision errors, the cut pipe may be too short. Adding a third rubber gasket between the two flanges can prevent the cut pipe from becoming too short and thus becoming unusable. The bending directions of the first bend joint 501 and the second bend joint 505 are opposite, which forms the Z-shaped second exhaust bend 50.
[0044] Furthermore, a laboratory exhaust system also includes an exhaust hose (not shown in the figure), which serves as a length compensation pipe. When adapting the exhaust system to other experimental equipment, if the current exhaust duct is too short and increasing the number of bamboo-type exhaust branch pipes does not achieve a suitable length, then the exhaust hose can be used to connect the outlet of the second exhaust bend 50 to the main exhaust pipe, thus providing length compensation. However, due to the poor durability of the exhaust hose, its service life should not be too long. The exhaust hose can be corrugated and extendable.
[0045] Application Examples
[0046] A laboratory exhaust system includes: a flat, scoop-shaped suction structure 10; a Z-shaped first exhaust bend 20 welded to the outlet of the suction structure 10; a first inspection port 201 provided on the surface of the first exhaust bend 201; the surface of the first inspection port 201 covered with a first transparent glass 60; stainless steel screws passing through threaded holes in clamps at both ends of the first transparent glass 60 to fix the first transparent glass 60 to the first exhaust bend 20; a 360° rotatable rotating device 30 installed at the inlet of the first exhaust bend 20; a first exhaust straight pipe 402 installed at the outlet of the rotating device 30; a second inspection port 401 provided on the surface of the first exhaust straight pipe 402; and the surface of the second inspection port 401 covered with a second... A transparent glass 70 is used, and stainless steel screws are used to pass through the threaded holes of the clamp at both ends of the second transparent glass 70 to fix the second transparent glass 70 to the first exhaust straight pipe 402. The air outlet of the first exhaust straight pipe 402, the first bamboo-type exhaust branch pipe 403, the second bamboo-type exhaust branch pipe 404, the third bamboo-type exhaust branch pipe 405 and the air inlet of the fourth bamboo-type exhaust branch pipe 406 are connected in sequence. The air outlet of the fourth bamboo-type exhaust branch pipe 406 is connected to the air inlet of the second exhaust straight pipe 408 through the flange 407. The air outlet of the second exhaust straight pipe 408, the first bend joint 501, the third exhaust straight pipe 502, the third flange 503, the fourth flange 507, the fourth exhaust straight pipe 504 and the second bend joint 505 are connected in sequence.
[0047] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A laboratory exhaust system, characterized in that, It includes a suction structure (10), a first exhaust bend (20), a rotating device (30), a first exhaust branch pipe (40), and a second exhaust bend (50); The suction structure (10) is shaped like a flat dustpan; The rotating device (30) includes a coaxial rotating part (301) and a fixed part (302); The air outlet of the suction structure (10), the first exhaust bend (20), and the rotating part (301) are connected in sequence. The fixing part (302) is connected to the air inlet of the first exhaust branch pipe (40). The air inlet (506) of the second exhaust bend (50) is vertically sleeved on the air outlet (409) of the first exhaust branch pipe (40). The air outlet (409) of the first exhaust branch pipe (40) is tapered with a smaller top and a larger bottom, and a first rubber pad (90) is fixed on its surface. The second exhaust bend... The air inlet (506) of (50) is a cone shape with a smaller top and a larger bottom. The sum of the lower outer diameter of the air outlet (409) of the first exhaust branch pipe (40) and the thickness of the first rubber pad (90) is less than the lower inner diameter of the air inlet (506) of the second exhaust bend pipe (50) and greater than the upper inner diameter of the air inlet (506) of the second exhaust bend pipe (50). The cone angle of the air outlet (409) of the first exhaust branch pipe (40) is the same as the cone angle of the air inlet (506) of the second exhaust bend pipe (50).
2. The laboratory exhaust system according to claim 1, characterized in that, The rotation angle of the rotating device is 360°.
3. The laboratory exhaust system according to claim 1, characterized in that, Both the first exhaust bend and the second exhaust bend are Z-shaped.
4. The laboratory exhaust system according to claim 1, characterized in that, The first exhaust bend has a first inspection port, the surface of which is covered with a first transparent glass; the first exhaust branch has a second inspection port, the surface of which is covered with a second transparent glass.
5. The laboratory exhaust system according to claim 4, characterized in that, It also includes a fastener for fixing the first transparent glass to the first exhaust bend and the second transparent glass to the first exhaust branch pipe.
6. The laboratory exhaust system according to claim 1, characterized in that, The first exhaust branch pipe is formed by sequentially connecting a first exhaust straight pipe, several sections of bamboo-joint exhaust branch pipes, and a second exhaust straight pipe.
7. The laboratory exhaust system according to claim 1, characterized in that, The inner surfaces of the suction structure, the first exhaust bend, the rotating device, the first exhaust branch pipe, and the second exhaust bend are all covered with a Teflon coating.
8. The laboratory exhaust system according to claim 1, characterized in that, The second exhaust bend includes a first bend joint, a third exhaust straight pipe, a third flange, a fourth flange, a fourth exhaust straight pipe, and a second bend joint connected in sequence. The air inlet of the first bend joint serves as the air inlet of the second exhaust bend, and the air outlet of the second bend joint serves as the air outlet of the second exhaust bend.
9. The laboratory exhaust system according to claim 1, characterized in that, It also includes an exhaust hose, which serves as a length compensation pipe.
10. The laboratory exhaust system according to claim 1, characterized in that, It also includes a fixing structure for fixing the first exhaust bend.