A wind-reducing and concentration-increasing exhaust device

Abstract

The utility model provides a kind of wind reduction and concentration exhaust device, including cabinet frame, the inner side surface of cabinet frame is respectively fixed with suction hood and air supply pipe group, and suction hood and air supply pipe group are respectively communicated with the air supply passage and suction passage in the inside of cabinet frame, air supply passage and suction passage are respectively installed with suction fan and air supply fan, air supply passage and suction passage are communicated by circulating enrichment pipe, and discharge pipe is installed on circulating enrichment pipe, suction inlet is communicated with air supply passage, and air valve is installed on suction inlet and discharge pipe;The utility model is designed to reduce wind and reduce heat loss, improve VOCs concentration by circulating enrichment, reduce purification energy consumption;Double air curtain locks pollutants, ensures safety and is efficient;Functional module is integrated in cabinet, compact structure, convenient to install.

Description

Technical Field

[0001] This utility model belongs to the field of air reduction and concentration technology, and particularly relates to an air reduction and concentration exhaust device. Background Technology

[0002] In continuous production processes such as printing, coating, and composite material manufacturing, ovens are critical equipment, used to cure coatings with hot air. To ensure solvent vapor concentration remains below safe limits and maintain process stability, ovens need to continuously exhaust high-temperature waste gas containing volatile organic compounds (VOCs) while simultaneously replenishing a large amount of fresh air. This leads to two major drawbacks in traditional oven exhaust systems: The exhaust gas temperature from the oven is usually above 100℃, and direct discharge means huge heat loss. At the same time, the ambient temperature fresh air drawn in to replenish the exhaust air needs to be reheated to the process temperature. This double energy loss makes the oven one of the most energy-consuming units on the production line.

[0003] Due to the large exhaust volume, the exhaust gas discharged from the drying oven is a typical example of "large volume, low concentration" VOCs exhaust gas. Purifying this type of exhaust gas (such as using a regenerative thermal oxidizer, RTO) requires a large investment in equipment, and the auxiliary fuel consumption required to maintain the combustion temperature during operation is also considerable, resulting in low overall treatment efficiency and economic benefits.

[0004] Therefore, it is essential to invent a ventilation device that reduces air volume, increases concentration, and exhausts air. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a wind reduction, concentration, and exhaust device, including a chassis frame, a suction hood, an air supply duct assembly, an air supply channel, an air intake channel, a suction fan, an air supply fan, a circulating concentration pipe, an exhaust port, an intake port, and a damper. The suction hood and the air supply duct assembly are fixedly installed on the inner surface of the chassis frame. The suction hood and the air supply duct assembly are respectively connected to the air supply channel and the air intake channel inside the chassis frame. The suction fan and the air supply fan are respectively installed inside the air supply channel and the air intake channel. The air supply channel and the air intake channel are connected through the circulating concentration pipe. The exhaust port is installed on the circulating concentration pipe. The intake port is connected to the air supply channel. The damper is installed on both the intake port and the exhaust port.

[0006] Preferably, the air supply duct assembly includes a branch pipe, a left air supply duct, a right air supply duct, and an air supply groove. The branch pipe is fixedly installed on the chassis frame and connected to the air supply channel inside the chassis frame. The two ends of the branch pipe are respectively connected to the left air supply duct and the right air supply duct. The left air supply duct and the right air supply duct are provided with the air supply groove.

[0007] Preferably, the air supply slots on the left and right air supply pipes face the suction hood, the suction hood is connected to the suction channel, the suction fan is installed inside the suction channel, and the suction fan is arranged opposite to the air supply fan installed in the air supply channel.

[0008] Preferably, the circulating enrichment pipe, which connects the air supply channel and the air intake channel, is installed inside the upper part of the chassis frame. The circulating enrichment pipe is equipped with a waste gas concentration detection sensor, and the discharge port connected to the circulating enrichment pipe is connected to the waste gas purification equipment.

[0009] Preferably, the discharge port and the suction port are fixedly installed on the chassis frame, and the air supply channel is connected to the oven through the suction port.

[0010] Compared with the prior art, the present invention has the following beneficial effects: This invention employs a unique circulating enrichment pipe design, which recirculates most of the VOC-containing waste gas collected in the suction channel back to the supply channel, reusing it to form an air curtain. Only when the concentration reaches a set threshold is a small stream of high-concentration waste gas discharged through the exhaust pipe. This fundamentally and significantly reduces the total exhaust volume of the oven and the resulting heat loss, while increasing the VOC concentration of the discharged waste gas several times over. This allows subsequent purification equipment to operate efficiently on a small scale with low energy consumption, resulting in a significant reduction in overall energy consumption.

[0011] This invention employs a design where left and right air supply ducts deliver air curtains and guide them to the suction hood, creating a directional and stable airflow barrier. This barrier effectively traps the emitted VOCs vapors within the airflow corridor, preventing their diffusion into the workshop environment. This not only protects the health and safety of operators but also ensures the efficient capture of pollutants, while reducing disturbances to the process airflow within the oven.

[0012] This utility model integrates all functional modules such as air supply, air intake, circulation, detection and control into a single chassis frame. The structure is compact and reasonable, and it can be directly installed as a standard functional module at the inlet of newly built or renovated oven equipment. It is easy to install, does not occupy too much production space, and has high engineering practicality and market promotion value. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0014] Figure 2 This is a partial cross-sectional structural diagram of the present invention.

[0015] Figure 3 This is a structural schematic diagram of the air supply duct assembly of this utility model.

[0016] In the picture: 1. Chassis frame; 2. Suction hood; 3. Air supply duct assembly; 31. Branch pipe; 32. Left air supply duct; 33. Right air supply duct; 34. Air supply channel; 4. Air supply channel; 5. Suction fan; 6. Air supply fan; 7. Circulating thickening pipe; 8. Discharge port; 9. Suction port; 10. Air valve; 11. Detailed Implementation

[0017] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0018] In the description of the embodiments, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of the utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in the present utility model based on the specific circumstances.

[0019] As attached Figure 1 To be continued Figure 3 As shown: This utility model provides a de-icing, concentration-enhancing, and exhaust device, comprising a chassis frame 1, a suction hood 2, an air supply duct assembly 3, an air supply channel 4, an air intake channel 5, a suction fan 6, an air supply fan 7, a circulating concentration pipe 8, an exhaust port 9, an intake port 10, and an air valve 11. The suction hood 2 and the air supply duct assembly 3 are fixedly installed on the inner surface of the chassis frame 1. The suction hood 2 and the air supply duct assembly 3 are respectively connected to the air supply channel 4 and the air intake channel 5 inside the chassis frame 1. The suction fan 6 and the air supply fan 7 are respectively installed inside the air supply channel 4 and the air intake channel 5. The air supply channel 4 and the air intake channel 5 are connected through the circulating concentration pipe 8. The exhaust port 9 is installed on the circulating concentration pipe 8. The intake port 10 is connected to the air supply channel 4. The air valve 11 is installed on both the intake port 10 and the exhaust port 9.

[0020] Furthermore, the air supply duct assembly 3 includes a branch pipe 31, a left air supply duct 32, a right air supply duct 33, and an air supply channel 34. The branch pipe 31 is made of galvanized steel plate with a thickness of 1.5-2mm, bent and formed, and is fixedly installed on the preset mounting holes on the inner side wall of the chassis frame 1 by M8 bolts. One end of the branch pipe 31 is sealed and connected to the air supply channel 4 inside the chassis frame 1 through a flange (a heat-resistant rubber gasket is installed between the flanges to prevent air leakage). The branch pipe 31 has a "T" shaped structure, and its two ends are connected to the left air supply duct 32 and the right air supply duct 33 by welding respectively. The left air supply duct 32 and the right air supply duct 33 are both rectangular or circular cross-section steel pipes (cross-section size 100mm×80mm), which are perpendicular to the branch pipe 31 and symmetrically located on both sides of the suction hood 2. On the side wall of the left air supply pipe 32 and the right air supply pipe 33 facing the suction hood 2, there are 1-3 air supply grooves 34 along the length direction. The air supply grooves 34 are long strip openings with a spacing of 20-30mm between adjacent grooves, and the edges of the groove openings are rounded (to avoid airflow disturbance) to ensure that the air supply airflow forms a uniform and stable air curtain.

[0021] Furthermore, the air delivery slots 34 on the left and right air delivery pipes 32 and 33 are inclined towards the suction hood 2 at an angle of 10°-15°, ensuring that the blown airflow is precisely guided to the inlet area of ​​the suction hood 2, forming a double-sided enclosed air curtain barrier. The suction hood 2 is made of 304 stainless steel sheet and is flared in shape. Its small end is welded to the inlet end of the suction channel 5 to ensure that the collected pollutants are not leaked. Inside the suction channel 5, a suction fan 6 (a centrifugal fan with an air volume of 1000-2000 m³ / h) is fixedly installed by a bracket. The air delivery channel 4 is parallel to the suction channel 5, and the corresponding air delivery fan 7 (a centrifugal fan of the same model) installed inside is collinear with the suction fan 6 and has the opposite airflow direction. The suction fan 6 generates negative pressure to draw in airflow, while the air delivery fan 7 generates positive pressure to push airflow. The two work together to form a closed-loop airflow dynamic, ensuring the stability of the air curtain and the efficient entrainment of pollutants.

[0022] Furthermore, the circulating enrichment pipe 8, connecting the air supply channel 4 and the air intake channel 5, is made of seamless steel pipe (150-250mm in diameter) and is horizontally installed inside the upper part of the chassis frame 1 via flange connection (a shock-absorbing pad is installed between the outer wall of the pipe and the frame to reduce operating noise). A waste gas concentration detection sensor (a catalytic combustion VOCs sensor with a detection range of 0-20g / m³ and a response time ≤3s) is fixedly installed in the middle section of the circulating enrichment pipe 8 using clamps. The sensor probe faces the airflow direction inside the pipe (to avoid dead zones affecting detection accuracy). The discharge port 9 (100-150mm in diameter), which is perpendicularly connected to the middle section of the circulating enrichment pipe 8, uses a flange structure and is bolted to the inlet pipe of the waste gas purification equipment (such as a small RTO or activated carbon adsorption box). An asbestos gasket is installed between the flanges to ensure no leakage during waste gas transportation, and the axis of the discharge port 9 intersects perpendicularly with the axis of the circulating enrichment pipe 8 to reduce airflow resistance.

[0023] Furthermore, both the discharge port 9 and the suction port 10 are made of cast iron (5-8mm thick) and are fixedly installed on the outer wall of the chassis frame 1 by welding. Reinforcing ribs (30mm wide, 5mm thick) are welded to the outer wall of the ports to enhance structural strength. One end of the suction port 10 is connected to the end of the air supply channel 4 via a flange, and the other end is connected to the air outlet of the industrial oven via a flexible corrugated pipe (made of heat-resistant silicone, 300-500mm long) (the corrugated pipe absorbs equipment vibration and prevents pipeline fatigue damage). The air valves 11 installed on both the discharge port 9 and the suction port 10 are electric butterfly valves (diameter matched to the port). The valve stem is connected to the drive motor via a coupling, and remote opening and closing and opening adjustment can be achieved through a PLC control system. The air valve at the suction port 10 controls the supplementary air volume of the oven, and the air valve at the discharge port 9 controls the emission volume of the concentrated waste gas. Both are linked with the concentration sensor in the circulating enrichment pipe 8 to achieve fully automatic concentration control.

[0024] The working principle is as follows: First, after the device is started, the air supply fan 7 runs first, and at the same time, the air valve 11 on the inlet 10 and the air valve 11 on the outlet 9 are closed. The positive pressure airflow generated by the air supply fan 7 enters the air supply channel 4. The airflow is transported through the air supply channel 4 to the branch pipe 31 of the air supply pipe group 3. The branch pipe 31 evenly distributes the airflow to the left air supply pipe 32 and the right air supply pipe 33. Then the airflow is blown out through the air supply grooves 34 on the left air supply pipe 32 and the right air supply pipe 33, forming a double-sided parallel air curtain barrier.

[0025] Next, the suction fan 6 starts simultaneously. The suction fan 6 generates negative pressure in the suction channel 5. The negative pressure forms a suction effect on the outside through the suction hood 2. At this time, the air curtain barrier will carry the surrounding pollution sources (such as VOCs and dust) to the entrance area of ​​the suction hood 2. The pollution sources are sucked into the suction hood 2 with the airflow and then enter the suction channel 5 through the suction hood 2.

[0026] Then, the pollutant-containing airflow entering the suction duct 5 is driven by the suction fan 6 into the circulating enrichment pipe 8. The circulating enrichment pipe 8 transports the airflow back to the supply air duct 4, forming a closed-loop airflow circulation of "supply air duct 4 → supply air duct group 3 → air curtain → suction hood 2 → suction duct 5 → circulating enrichment pipe 8 → supply air duct 4". During this circulation process, the pollutant continuously accumulates in the airflow, achieving a gradual increase in the concentration of exhaust gas.

[0027] Meanwhile, the waste gas concentration detection sensor in the circulating enrichment pipe 8 monitors the pollutant concentration of the airflow in the pipe in real time. When the concentration reaches the preset threshold, the air valve 11 on the discharge port 9 opens automatically, and the concentrated waste gas is transported to the external waste gas purification equipment through the discharge port 9 for subsequent purification treatment.

[0028] Finally, if the total airflow in the air supply channel 4 is insufficient during the process of discharging concentrated waste gas, the air valve 11 on the suction port 10 will open as needed, and the external supplementary air (or the air containing a small amount of pollutants discharged from the industrial oven) will enter the air supply channel 4 through the suction port 10 to maintain the stability of the air curtain and the balance of the circulating airflow. When the waste gas concentration in the circulating enrichment pipe 8 drops to the set lower limit, the air valve 11 on the discharge port 9 will close, and the air valve 11 on the suction port 10 will also close. The device will re-enter the closed-loop circulating enrichment state, and thus repeatedly achieve the continuous operation of "circulating enrichment - compliant discharge - supplementary balance".

[0029] Any technical solution that achieves the above-mentioned technical effects by utilizing the technical solution described in this utility model, or by designing a similar technical solution inspired by the technical solution described in this utility model, falls within the protection scope of this utility model.

Claims

1. A ventilation device for reducing air volume and increasing concentration, characterized in that, The system includes a chassis frame (1), an air suction hood (2), an air supply duct assembly (3), an air supply channel (4), an air intake channel (5), an air intake fan (6), an air supply fan (7), a circulating concentrator (8), an exhaust port (9), an intake port (10), and an air valve (11). The air suction hood (2) and the air supply duct assembly (3) are fixedly installed on the inner surface of the chassis frame (1). The air suction hood (2) and the air supply duct assembly (3) are respectively connected to the air supply channel (4) and the air intake channel (5) inside the chassis frame (1). The air duct (5) is connected. The air supply duct (4) and the air suction duct (5) are respectively equipped with the air suction fan (6) and the air supply fan (7). The air supply duct (4) and the air suction duct (5) are connected through the circulating enrichment pipe (8). The circulating enrichment pipe (8) is equipped with the discharge port (9). The suction port (10) is connected to the air supply duct (4). The air valve (11) is installed on both the suction port (10) and the discharge port (9).

2. The exhaust ventilation device for reducing air volume and increasing concentration as described in claim 1, characterized in that: The air supply duct assembly (3) includes a branch pipe (31), a left air supply duct (32), a right air supply duct (33), and an air supply groove (34). The branch pipe (31) is fixedly installed on the chassis frame (1) and connected to the air supply channel (4) inside the chassis frame (1). The two ends of the branch pipe (31) are connected to the left air supply duct (32) and the right air supply duct (33) respectively. The air supply groove (34) is provided on the left air supply duct (32) and the right air supply duct (33).

3. The exhaust device for reducing air volume and increasing concentration as described in claim 2, characterized in that: The air supply slots (34) on the left air supply pipe (32) and the right air supply pipe (33) face the suction hood (2). The suction hood (2) is connected to the suction channel (5). The suction fan (6) is installed inside the suction channel (5). The suction fan (6) is arranged opposite to the air supply fan (7) installed inside the air supply channel (4).

4. The exhaust device for reducing air volume and increasing concentration as described in claim 3, characterized in that: The circulating enrichment pipe (8), which is connected to the air supply channel (4) and the air intake channel (5), is installed inside the upper part of the chassis frame (1). The circulating enrichment pipe (8) is equipped with a waste gas concentration detection sensor. The discharge port (9) connected to the circulating enrichment pipe (8) is connected to the waste gas purification equipment.

5. The exhaust device for reducing air volume and increasing concentration as described in claim 4, characterized in that: The discharge port (9) and the suction port (10) are fixedly installed on the chassis frame (1), and the air supply channel (4) is connected to the oven through the suction port (10).

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