Laboratory exhaust device convenient to maintain

Abstract

The utility model provides a laboratory exhaust device convenient to maintain, and belongs to the technical field of exhaust equipment. According to the device, the adjustable first sliding rod and the L-shaped clamping rod are arranged at the joint of the ventilation pipeline and the exhaust pipeline, so that the mounting and dismounting processes are simplified, and complex steps and time consumption in maintenance of a traditional device are reduced; a multi-layer stacked rotating shaft and swing plate structure is adopted in the device, the rotating shaft droops through self weight to achieve effective sealing, external foreign matter or insects are prevented from reversely entering a laboratory, meanwhile, when a draught fan is started, the swing plate can be driven to swing, smooth circulation of air is guaranteed, and the backflow prevention performance is improved. In addition, through the matched design of a rotary adjusting bolt and a lifting block, the fan and other parts are easier and more convenient to disassemble, and maintenance is more efficient. The device has the advantages of being good in sealing performance, blocking resistance and convenient and fast to maintain, is suitable for the laboratory environment needing frequent inspection and cleaning, and improves the stability and the working efficiency of an exhaust system.

Description

Technical Field

[0001] This utility model belongs to the field of laboratory ventilation technology, specifically relating to a laboratory ventilation device that is easy to maintain. Background Technology

[0002] Laboratories, as high-precision and demanding working environments, often require exhaust systems to ensure air circulation and the safety of gas emissions, especially in areas where harmful gases or foreign substances may be generated, such as chemical or microbiological experiments. To effectively prevent external pollutants and insects from entering the laboratory, traditional laboratory exhaust systems are typically equipped with backflow prevention devices, such as oscillating baffles or backflow prevention valves. While traditional exhaust systems meet basic sealing requirements, they often present challenges in disassembly and maintenance, leading to prolonged downtime and disrupting normal laboratory operations.

[0003] Existing exhaust systems, especially those with baffles at the air inlet, are designed to prevent foreign objects from damaging the internal fan and to prevent insects from entering the laboratory. However, these baffles are often fixed structures, leaving gaps that allow small objects or insects to enter. Furthermore, dust accumulates on the baffle surfaces after prolonged use, requiring regular cleaning and maintenance. Additionally, the baffles in existing exhaust systems are often integrated structures, making cleaning difficult even when disassembled due to gaps. Utility Model Content

[0004] In view of the problems existing in the prior art, the purpose of this utility model is to provide a laboratory exhaust device that is easy to maintain. It can simplify the installation, disassembly and maintenance process of the equipment while ensuring the anti-backflow function and air circulation, thereby improving the working efficiency and maintenance convenience of the laboratory exhaust device and reducing the burden of daily laboratory operations.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A laboratory exhaust ventilation device that is easy to maintain includes a ventilation duct connected to an exhaust duct by bolts. An extension tube is provided at the front end of the ventilation duct, and a fan is installed inside the extension tube. A lip is provided on the front side of the extension tube, and mounting grooves are evenly distributed on both sides of the lip. Each mounting groove is a U-shaped structure with its front open. A rotating shaft is rotatably installed between two horizontally corresponding mounting grooves. Multiple rotating shafts are stacked vertically. A swing plate is provided on the rear side of the rotating shaft surface, with the swing plate facing downwards. Limiting plates are provided at both ends of the rotating shaft, and the cross-sectional dimension of the limiting plate is larger than that of the rotating shaft. The two limiting plates are respectively positioned on the outer sides of the lip.

[0007] Furthermore, two first fixing blocks are vertically arranged on both sides of the lip, the first fixing blocks are placed behind the mounting groove, and a first sliding rod is vertically slidably installed between the two first fixing blocks on the same side.

[0008] Furthermore, L-shaped locking rods are evenly arranged on the front side of the first slide rod, and the multiple L-shaped locking rods correspond one-to-one with the rotating shaft. The L-shaped locking rods limit the position of the limiting plate.

[0009] Furthermore, a second fixing block is symmetrically arranged on both sides of the upper surface of the lip, and a second sliding rod is transversely penetrating the surface of the second fixing block. The two ends of the two second sliding rods that are opposite to each other are hinged to a first connecting rod, and the ends of the two first connecting rods that are opposite to the second sliding rods are respectively hinged to the top of the two first sliding rods.

[0010] Furthermore, an adjusting bolt is vertically and rotatably mounted at the center of the upper surface of the lip, and a knob is provided on the top of the adjusting bolt.

[0011] Furthermore, a lifting block is screwed onto the surface of the adjusting bolt, and a second connecting rod is hinged to one end of the second slide rod that is close to each other. The ends of the two second connecting rods that are away from the second slide rods are respectively hinged to both sides of the lifting block.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] Firstly, existing exhaust systems often require the disassembly of multiple complex components during installation and maintenance, a cumbersome and time-consuming process. This invention, however, incorporates an adjustable first sliding rod and an L-shaped locking rod in conjunction with a limiting plate, employing a sliding adjustment method that makes installation and disassembly more efficient. Users only need to adjust the positions of the sliding rod and locking rod to easily complete the installation or disassembly, significantly reducing maintenance time and operational steps. This design effectively solves the problems of inconvenient maintenance and complex disassembly of traditional exhaust systems.

[0014] Secondly, this invention employs a multi-layered combination structure of rotating shafts and oscillating plates in the device. The oscillating plates of the rotating shafts have a self-weight-dependent sealing function, effectively preventing foreign objects or insects from entering the laboratory from the reverse direction, thus ensuring air quality within the laboratory. When the fan starts, the airflow pushes the oscillating plates to swing horizontally, increasing the gap between the plates and ensuring smooth airflow. This structural design not only improves the backflow prevention performance of the exhaust device but also avoids air pollution problems caused by poor equipment sealing.

[0015] Furthermore, in the maintenance of traditional exhaust systems, the disassembly of the connection between the fan and the exhaust duct is quite complex, often requiring significant labor costs and time. This invention introduces a cooperative structure between a rotating adjusting bolt and a lifting block, allowing for quick unlocking of the connection through a simple rotational adjustment operation, enabling easy disassembly of the fan and other components. Multiple swing plates are also removable for effective surface cleaning. This design effectively solves the problems of difficult disassembly and inconvenient fan maintenance in traditional devices. Simultaneously, the rapid disassembly and cleaning process reduces the probability of equipment failure and improves the reliability of the exhaust system. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the installation three-dimensional structure of this utility model;

[0017] Figure 2 This is a front view structural diagram of the present utility model;

[0018] Figure 3 This is a schematic diagram of the structure of this utility model in the state without the swing plate;

[0019] Figure 4 This is a schematic diagram of the swing plate structure of this utility model;

[0020] Figure 5 This is a schematic diagram of the installation structure of the first sliding rod and the L-shaped locking rod of this utility model;

[0021] Figure 6 For the present utility model Figure 1 A magnified structural diagram of area A.

[0022] The attached diagram lists the components represented by each number as follows:

[0023] 1. Ventilation duct; 11. Extension tube; 12. Lip; 13. Mounting groove; 14. First fixing block; 15. Second fixing block; 2. Fan; 3. Rotating shaft; 31. Limiting plate; 32. Swing plate; 4. First sliding rod; 41. L-shaped locking rod; 5. Second sliding rod; 6. First connecting rod; 7. Second connecting rod; 8. Adjusting bolt; 81. Knob; 9. Lifting block. Detailed Implementation

[0024] To make the objectives and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of this utility model and does not strictly limit the scope of protection specifically claimed by this utility model.

[0025] refer to Figures 1-5As shown, a maintenance-friendly laboratory exhaust system includes a ventilation duct 1, which is bolted to an exhaust duct to ensure a secure connection and prevent loosening. An extension tube 11 is located at the front end of the ventilation duct 1, and a fan 2 is installed inside the extension tube 11. The fan 2 is typically a "YWF-4" high-efficiency centrifugal fan, which has high airflow output and low energy consumption. A lip 12 is provided on the front side of the extension tube 11, and mounting grooves 13 are evenly spaced on both sides of the lip 12. The mounting grooves 13 are U-shaped structures with an open front side, facilitating fixed connections with other components. A rotating shaft 3 is rotatably mounted between two horizontally corresponding mounting grooves 13. The rotating shaft 3 is made of high-strength stainless steel with an anti-corrosion surface treatment to ensure stability and durability during long-term use. Multiple rotating shafts 3 are stacked vertically to provide sufficient support and rotation space to adapt to different exhaust requirements. A swing plate 32 is provided on the rear side of the rotating shaft 3. The swing plate 32 is made of high-temperature resistant and corrosion-resistant material. The swing plate 32 is set downward. When the system is in normal state, it hangs down naturally by its own weight, forming an effective seal to prevent foreign objects or insects from entering the laboratory through the ventilation duct 1. Limiting plates 31 are provided at both ends of the rotating shaft 3. The cross-sectional dimension of the limiting plates 31 is larger than that of the rotating shaft 3, which serves to fix the rotating shaft 3 and prevent the rotating shaft 3 from moving axially. The two limiting plates 31 are respectively placed on both sides of the outer edge 12 to ensure the stability of the device and prevent the rotating shaft 3 from being accidentally displaced.

[0026] refer to Figure 1 and Figure 5 As shown, two first fixing blocks 14 are vertically arranged on both sides of the lip 12. The first fixing blocks 14 are made of aluminum alloy, which has good strength and corrosion resistance. The first fixing blocks 14 are placed behind the mounting groove 13. A first sliding rod 4 is vertically slidably installed between the two first fixing blocks 14 on the same side. The sliding design of the first sliding rod 4 can quickly adjust the position, which is convenient for installation and disassembly. L-shaped locking rods 41 are evenly arranged on the front side of the first sliding rod 4. Multiple L-shaped locking rods 41 correspond one-to-one with the rotating shaft 3. The L-shaped locking rods 41 are made of high-strength steel and the surface is hardened to enhance their wear resistance. The L-shaped locking rods 41 limit the limiting plate 31 to prevent the rotating shaft 3 from loosening or shifting during operation, thereby ensuring the sealing and ventilation effect of the device.

[0027] refer to Figure 1 and Figure 6As shown, symmetrical second fixing blocks 15 are arranged on both sides of the upper surface of the lip 12. The second fixing blocks 15 are made of engineering plastic, which has good corrosion resistance and wear resistance. A second sliding rod 5 is transversely inserted through the surface of the second fixing block 15. The second sliding rod 5 is made of stainless steel and its surface is specially treated to have strong corrosion resistance. The two ends of the two second sliding rods 5 that are opposite to each other are hinged to the first connecting rod 6. The first connecting rod 6 is made of high-strength alloy material, which is heat-resistant and has good strength, ensuring that it can withstand a large operating force when the system is working. The ends of the two first connecting rods 6 that are opposite to the second sliding rods 5 are respectively hinged to the top of the two first sliding rods 4. Through this connection structure, the first sliding rods 4 can be adjusted up and down, thereby controlling the limiting force of the L-shaped locking rod 41 on the limiting plate 31, so that the rotating shaft 3 can be installed and disassembled smoothly, improving the maintainability and convenience of the device.

[0028] refer to Figure 6 As shown, an adjusting bolt 8 is vertically and rotatably mounted at the center of the upper surface of the lip 12. The adjusting bolt 8 is made of high-strength alloy steel, which has good wear resistance and corrosion resistance, ensuring stable and reliable operation during long-term use. A knob 81 is provided on the top of the adjusting bolt 8. The knob 81 is ergonomically designed for easy operation by the user for precise adjustment. By rotating the adjusting bolt 8, the position and tightness of the internal components of the device can be easily adjusted, making it easier to disassemble and replace the parts that need maintenance during maintenance.

[0029] refer to Figure 6 As shown, a lifting block 9 is screwed onto the surface of the adjusting bolt 8. The lifting block 9 is made of a special plastic material, possessing high wear resistance and good impact resistance, ensuring stability during long-term use. Second connecting rods 7 are hinged to the adjacent ends of the second sliding rods 5. The second connecting rods 7 are made of high-strength alloy steel, corrosion-resistant and possessing sufficient rigidity. The ends of the two second connecting rods 7 opposite to the second sliding rods 5 are hinged to both sides of the lifting block 9. The up-and-down movement of the lifting block 9 facilitates the disassembly and maintenance of the entire device, allowing for the smooth disassembly of the rotating shaft 3 and related components, providing a convenient maintenance method. This design effectively simplifies the equipment maintenance process, reduces maintenance time, and improves the maintainability of the exhaust system, making it particularly suitable for laboratory environments requiring regular inspection and cleaning.

[0030] The working principle of this utility model is as follows: During installation, the rear end of the ventilation duct 1 is fixed to the exhaust duct with bolts. Under normal conditions, due to its own weight, the swing plate 32 tends to move downwards, causing multiple swing plates 32 to overlap each other, thus sealing the front opening of the extension cylinder 11 and preventing foreign objects or insects from entering the laboratory through the ventilation duct 1. When exhaust is required, the fan 2 can be started to extract the air from the laboratory. At this time, the wind force can drive the swing plate 32 to swing backwards, making it tend to be horizontal, increasing the distance between the swing plates 32, and ensuring air circulation. To ensure smooth airflow, when maintenance is required, the top rotating knob 81 can be used to rotate the adjusting bolt 8, which in turn moves the lifting block 9 up and down. During disassembly, the lifting block 9 is controlled to move down so that the second sliding rod 5 can be pushed outward through the second connecting rod 7, and then the first sliding rod 4 can be pushed up through the first connecting rod 6, so that the L-shaped locking rod 41 no longer limits the limiting plate 31. At this time, the rotating shafts 3 can be removed one by one for cleaning. After all the rotating shafts 3 are removed, the front end of the fan 2 is exposed, which facilitates the maintenance of the fan 2.

[0031] First, the rotating shaft 3 is installed in the two horizontally corresponding mounting slots 13. Both ends are limited by the limiting plates 31, so that the rotating shaft 3 will not move axially. After the rotating shaft 3 is installed in place, the first sliding rods 4 on both sides are controlled to move down simultaneously to quickly limit the limiting plates 31 and improve the convenience of installation and disassembly.

[0032] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, shall be implemented using conventional methods in the field.

Claims

1. A laboratory exhaust system that is easy to maintain, comprising a ventilation duct (1), characterized in that: The ventilation duct (1) is connected to the exhaust duct by bolts. An extension tube (11) is provided at the front end of the ventilation duct (1). A fan (2) is installed inside the extension tube (11). A lip (12) is provided on the front side of the extension tube (11). Installation grooves (13) are evenly opened on both sides of the lip (12). The installation groove (13) is a U-shaped structure with the front side open. A rotating shaft (3) is rotatably installed between two horizontally corresponding installation grooves (13). Multiple rotating shafts (3) are stacked vertically. A swing plate (32) is provided on the rear side of the surface of the rotating shaft (3). The swing plate (32) is set downward. Limiting plates (31) are provided at both ends of the rotating shaft (3). The cross-sectional size of the limiting plate (31) is larger than that of the rotating shaft (3). The two limiting plates (31) are respectively placed on the outer sides of the lip (12).

2. The laboratory exhaust device for easy maintenance according to claim 1, characterized in that: Two first fixing blocks (14) are vertically arranged on both sides of the lip (12). The first fixing blocks (14) are placed behind the mounting groove (13), and a first sliding rod (4) is vertically slidably installed between the two first fixing blocks (14) on the same side.

3. The laboratory exhaust device for easy maintenance according to claim 2, characterized in that: The first slide bar (4) is uniformly provided with L-shaped locking rods (41) on its front side. The multiple L-shaped locking rods (41) correspond one-to-one with the rotating shaft (3). The L-shaped locking rods (41) limit the position of the limiting plate (31).

4. The laboratory exhaust device for easy maintenance according to claim 2, characterized in that: The upper surface of the lip (12) is symmetrically provided with a second fixing block (15) on both sides. A second sliding rod (5) is transversely passed through the surface of the second fixing block (15). The two second sliding rods (5) are hinged to a first connecting rod (6) at their opposite ends. The two first connecting rods (6) are respectively hinged to the top of the two first sliding rods (4) at their opposite ends.

5. A laboratory exhaust system for easy maintenance according to claim 4, characterized in that: An adjusting bolt (8) is vertically and rotatably mounted on the center of the upper surface of the lip (12), and a knob (81) is provided on the top of the adjusting bolt (8).

6. A laboratory exhaust system for easy maintenance according to claim 5, characterized in that: The adjusting bolt (8) has a lifting block (9) screwed onto its surface. The ends of the second slide rods (5) that are close to each other are respectively hinged to the second connecting rods (7). The ends of the two second connecting rods (7) that are away from the second slide rods (5) are respectively hinged to the two sides of the lifting block (9).

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