Optimized structure of internal mixer exhaust device

Abstract

The utility model provides an optimized structure of an internal mixer exhaust device, which belongs to the technical field of internal mixers and comprises a cylindrical blanking device which comprises at least one air inlet and at least one air outlet. The air inlet is formed in the position, close to the bottom, of the discharging device, the air outlet is located above the position, away from the air outlet by 90 degrees, of the discharging device, a partition plate is arranged in the center of the interior of the discharging device, the partition plate is used for dividing the interior space of the discharging device into two different areas, the partition plate is arranged in an inclined mode, and the air inlet and the air outlet are communicated through the partition plate. Comprising a high end and a low end, a condensing device is arranged at the low end of the partition plate, the condensing device is used for condensing and recycling small molecular substances, and the air inlet, the air outlet, the inclined partition plate and the condensing device are additionally arranged on the basis of an original discharging cylindrical device, so that the defect that the filtering effect of a traditional internal mixer exhaust device is limited is overcome.

Description

Technical Field

[0001] The utility model belongs to the technical field of internal mixers, and in particular relates to an optimized structure of an exhaust device of an internal mixer. Background Art

[0002] An internal mixer is a device widely used in the processing of polymer materials such as rubber and plastics. Its primary function is to shear, mix, and plasticize the raw materials within a sealed chamber using two counter-rotating rotors to achieve uniform mixing and plasticization. Internal mixers offer advantages in industrial production, such as high efficiency, energy conservation, and environmental friendliness, and are widely used in tire manufacturing, cable insulation, seals, and other fields. However, during the mixer's unloading process, air entrained in the premix can easily lead to dust spillage and exhaust emissions. These issues not only impact the production environment but also pose health risks to operators and complicate subsequent exhaust gas treatment. Therefore, the design and optimization of internal mixer exhaust systems are particularly important.

[0003] The basic structure of an internal mixer: Closed chamber: The core part of the internal mixer is a closed chamber with two relatively rotating rotors installed inside. The rotational motion of the rotor causes the material to be strongly sheared and mixed in the chamber, thereby achieving uniform mixing and plasticization. Feeding port and discharging port: The internal mixer is usually equipped with a feeding port and a discharging port. The feeding port is used to add raw materials, and the discharging port is used to discharge the mixed material. During the discharging process, the air entrained in the material will be discharged along with the material, resulting in dust overflow. Cooling system: In order to control the temperature during the internal mixing process, the internal mixer is usually equipped with a cooling system. The cooling system uses circulating water or other cooling media to cool the chamber and rotor to prevent the material from decomposing or deteriorating due to overheating.

[0004] Early internal mixer exhaust systems typically used single-stage filters, using simple screens or filter cloths to capture dust. This simple and cost-effective structure limited filtration efficiency and was ineffective in separating air from dust, particularly fine dust and small molecules. With technological advancements, multi-stage filters were gradually introduced. These filters use multiple layers of screens or filter cloths with varying pore sizes to gradually capture dust particles of varying sizes. This structure improves filtration efficiency, but still presents challenges such as high filtration resistance and frequent maintenance. Wet dust collectors capture airborne dust using water mist or liquid sprays. While suitable for treating exhaust gases containing significant amounts of water, they can generate secondary pollution and have high maintenance costs. Traditional internal mixer exhaust systems have the following drawbacks: While single-stage and multi-stage filters can capture some dust, they are ineffective at separating fine dust and small molecules, leading to dust spillage and exhaust emissions. While wet dust collectors effectively capture dust, they also generate wastewater, requiring additional wastewater treatment facilities and increasing environmental burdens. Electrostatic precipitators are complex equipment, have high maintenance costs, are sensitive to environmental conditions (such as humidity), and have a limited scope of application. Utility Model Content

[0005] In view of this, the utility model provides an optimized structure of the exhaust device of an internal mixer. By adding an air inlet, an exhaust port, an oblique partition and a condensing device on the basis of the original cylindrical device for unloading, the disadvantage of the limited filtering effect of the exhaust device of the traditional internal mixer is solved, and the gas-dust separation and the condensation recovery of small molecular substances are realized.

[0006] The utility model is achieved in this way:

[0007] The utility model provides an optimized structure of an exhaust device of an internal mixer, which includes a feeding device, which is cylindrical and includes at least one air inlet and at least one exhaust port. The air inlet is arranged near the bottom of the feeding device, and the exhaust port is located above the exhaust port at a position 90° away. A partition is provided at the central position of the interior of the feeding device, and the partition is used to divide the internal space of the feeding device into two different areas. The partition is arranged at an angle and includes a high end and a low end. A condensing device is provided at the low end of the partition, and the condensing device is used to condense and recover small molecular substances.

[0008] The optimized structure of the internal mixer exhaust device provided by this utility model has the following technical effects: by adding an air inlet, an exhaust port, an inclined partition, and a condensing device to the cylindrical discharge device, gas-dust separation and condensation recovery of small molecules are achieved. This design not only effectively reduces dust spillage, but also improves the efficiency of exhaust gas treatment and reduces environmental pollution.

[0009] On the basis of the above technical solution, the optimized structure of the exhaust device of an internal mixer of the present invention can also be improved as follows:

[0010] Wherein, the vertical distance between the air inlet and the bottom surface of the blanking device accounts for 1 / 4 to 1 / 3 of the total height of the blanking device.

[0011] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the positioning design of the air inlet ensures that the gas enters from the bottom, which is conducive to the settling of dust. This design reduces the possibility of dust being discharged with the gas and improves the gas-dust separation effect.

[0012] Furthermore, a horizontal angle formed between the exhaust port and the air inlet is 90 degrees, and a height of the exhaust port is higher than a height of the air inlet.

[0013] The beneficial effects of this improved solution are as follows: the exhaust port's positioning ensures that gas is discharged from above, avoiding interference with the air inlet. This design improves the smoothness of gas flow, reduces airflow turbulence, and further enhances gas-dust separation. Specifically, the center of the exhaust port is located directly above the center of the air inlet, and the horizontal distance from the center of the air inlet is equal to 1 / 2 the diameter of the device. This design ensures that gas is discharged from above, avoiding direct interference with the air inlet.

[0014] Furthermore, the angle formed by the partition and the horizontal plane ranges from 15 degrees to 45 degrees.

[0015] The beneficial effects of this improved solution are as follows: the angled design of the oblique baffles ensures effective dust settling while simultaneously directing gas out the other side, achieving gas-dust separation. This design improves separation efficiency and reduces dust resuspension. After entering the device through the air inlet, gas flows along the lower area within the device, guided by the oblique baffles. Dust settles below the baffles under the action of gravity, while gas rises from the other side and is ultimately discharged through the air outlet. This design ensures uniform airflow distribution and effective dust settling.

[0016] Function of the partition: The oblique partition divides the internal space of the device into two areas. Dust settles under the partition under the action of gravity, and the gas flows out from the other side of the partition. The angle design of the oblique partition (15 degrees to 45 degrees) ensures the effective sedimentation of dust, while guiding the gas to flow out from the other side, improving separation efficiency. The length of the partition is 0.7 to 0.9 times the diameter of the device, ensuring the effective coverage of the partition. One end of the partition is fixed near the bottom of the device, close to the air inlet. The other end of the partition extends to the middle of the device or slightly above the middle, close to the air outlet.

[0017] Furthermore, the distance between the lower end of the partition and the bottom inner wall of the blanking device is no more than 10 cm.

[0018] The air inlet is located below the partition. After the gas enters the device from the air inlet, it flows along the bottom of the device and is guided to flow upward after encountering the partition.

[0019] The design of the partition allows the dust to settle below the partition under the action of gravity, while the gas flows upward along the slope of the partition.

[0020] The air outlet is located above the partition. Specifically, the center point of the air outlet is located at the high end of the partition, at a 90-degree angle to the air inlet.

[0021] As the gas rises along the inclined surface of the partition, it is filtered and guided by the partition and finally discharged from the outlet.

[0022] The beneficial effects of adopting the above-mentioned improvement scheme are: the distance design between the lower end of the inclined partition and the bottom inner wall ensures the smooth discharge of dust and avoids dust accumulation at the bottom. This design improves the cleanliness and maintenance convenience of the system.

[0023] Furthermore, the condensing device is provided with a cooling pipe or cooling fin, which is installed inside the condensing device, close to the lower end of the partition, and is used to reduce the temperature by heat exchange to achieve condensation of small molecular substances.

[0024] The benefits of this improved solution include: the installation of cooling pipes or cooling fins ensures efficient heat exchange, allowing small molecules to condense quickly at low temperatures, thereby improving recovery rates. This design also increases the flexibility of the device, allowing different cooling methods to be selected according to different operating conditions.

[0025] Furthermore, the condensing device is a semi-cylindrical structure, and the cooling pipes or cooling fins are arranged along a semicircular arc surface.

[0026] The benefits of this improved solution include: the semi-circular design of the condensing unit adapts to varying installation space requirements, improving the unit's adaptability. The arrangement of the cooling pipes or fins ensures uniform flow of gases and small molecules, enhancing condensation efficiency. The diameter of the semi-cylindrical structure of the condensing unit should match the dimensions of the main body of the feeding device. The diameter of the semi-cylindrical structure is equal to the diameter of the main body of the feeding device. The condensing unit is connected to the inner wall of the feeding device by welding.

[0027] Furthermore, the air inlet and the exhaust port are respectively provided with filter screens, and the filter screens are matched with the air inlet and the exhaust port respectively.

[0028] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the filter design of the air inlet and exhaust port prevents the entry or discharge of large particles, protects the cleanliness of the internal particulate matter, and extends the service life of the device. This design improves the reliability and stability of the system.

[0029] Furthermore, the unloading device also includes a dust outlet for discharging settled dust. The dust outlet is equipped with a baffle, and a slide rail is provided at the side of the dust outlet. The baffle is slidably connected to the slide rail. To ensure that dust in the air can be effectively captured and collected, the air inlet is usually located on the side of the device, and the dust outlet is located on the side opposite the air inlet of the device.

[0030] The fixed connection is specifically through a slider connection, and the baffle and slider are connected by bonding or welding. The adjustable dust outlet design allows the operator to flexibly adjust the dust discharge volume and timing according to actual conditions, improving the convenience and flexibility of operation and reducing the impact of dust accumulation on the system.

[0031] Furthermore, the dust outlet is located below the partition, close to the bottom of the feeding device.

[0032] Compared with the prior art, the beneficial effects of the optimized structure of the exhaust device of an internal mixer provided by the utility model are:

[0033] Efficient gas and dust separation:

[0034] The design of the oblique partition effectively separates the airflow and dust. The oblique partition divides the internal space of the device into two areas. Dust settles under the partition under the action of gravity, and the gas flows out from the other side of the partition, achieving gas-dust separation.

[0035] The angle design of the oblique partition (15 to 45 degrees) ensures the effective sedimentation of dust, while guiding the gas to flow out from the other side, improving the separation efficiency;

[0036] Condensation recovery of small molecules:

[0037] The condensing device is installed at the lower end of the inclined partition, and the condensation and recovery of small molecules are achieved through cooling pipes or cooling fins. The cooling pipes or cooling fins are close to the inclined partition, ensuring efficient heat exchange, allowing small molecules to condense quickly at low temperatures and improving the recovery rate.

[0038] The operating temperature of the condensing device is more than 10℃ lower than the ambient temperature, which ensures the effective condensation of small molecular substances and reduces the volatilization loss of condensate;

[0039] Flexible dust outlet adjustment:

[0040] The adjustable dust outlet design allows the operator to flexibly adjust the dust discharge volume and timing according to actual conditions. The manual slide adjustment method provides a simple and intuitive adjustment method, suitable for occasions that require frequent manual operation;

[0041] Electric adjustment and pneumatic adjustment methods realize automatic adjustment through motors and cylinders, which improves the accuracy and efficiency of operation and is suitable for occasions requiring precise control.

[0042] Optimized gas flow path:

[0043] The position design of the air inlet and exhaust port ensures uniform gas flow and reduces air turbulence. The air inlet is located near the bottom of the device, and the exhaust port is located above the air inlet at a 90-degree angle. This design improves the smoothness of gas flow and further enhances the gas-dust separation effect.

[0044] Reduce environmental pollution:

[0045] The utility model device significantly reduces dust overflow and waste gas emission through efficient gas-dust separation and condensation recovery of small molecular substances, reduces environmental pollution and improves the quality of the production environment;

[0046] The use of condensation devices reduces the volatilization loss of small molecular substances and further reduces the impact on the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0048] Figure 1 This is an example diagram of the optimized structure of an exhaust device for an internal mixer;

[0049] Figure 2 A perspective view of a first embodiment of an optimized structure of an exhaust device for an internal mixer;

[0050] Figure 3 A perspective view of a second embodiment of an optimized structure of an exhaust device for an internal mixer;

[0051] Figure 4 A top view of a first embodiment of an optimized structure of an exhaust device for an internal mixer;

[0052] Figure 5 A top view of a second embodiment of an optimized structure of an exhaust device for an internal mixer;

[0053] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0054] 10. Feeding device; 11. Air inlet; 12. Exhaust port; 20. Partition; 30. Condensation device; 40. Dust outlet. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention.

[0056] like Figure 1 、 Figure 2 、 Figure 4 As shown, it is a first embodiment of the optimized structure of an exhaust device for an internal mixer provided by the utility model. In this embodiment, it includes a feeding device 10, which is cylindrical. The feeding device 10 includes at least one air inlet 11 and at least one exhaust port 12. The air inlet 11 is arranged near the bottom of the feeding device 10, and the exhaust port 12 is located above the exhaust port 12 at a 90° angle. A partition 20 is provided at the central position of the interior of the feeding device 10. The partition 20 is used to divide the internal space of the feeding device 10 into two different areas. The partition 20 is arranged at an angle, including a high end and a low end. A condensing device 30 is provided at the low end of the partition 20. The condensing device 30 is used to condense and recover small molecular substances.

[0057] In the above technical solution, the vertical distance between the air inlet 11 and the bottom surface of the blanking device 10 accounts for 1 / 4 to 1 / 3 of the total height of the blanking device 10.

[0058] Furthermore, in the above technical solution, the horizontal angle formed between the exhaust port 12 and the air inlet 11 is 90 degrees, and the height of the exhaust port 12 is higher than the height of the air inlet 11 .

[0059] Furthermore, in the above technical solution, the angle formed by the partition 20 and the horizontal plane ranges from 15 degrees to 45 degrees.

[0060] Furthermore, in the above technical solution, the distance between the lower end of the partition 20 and the bottom inner wall of the blanking device 10 is not greater than 10 cm.

[0061] Furthermore, in the above technical solution, the condensing device 30 is provided with a cooling pipe, which is installed inside the condensing device 30 and close to the lower end of the partition 20, and is used to reduce the temperature by heat exchange to achieve condensation of small molecular substances.

[0062] Fixing of cooling pipes:

[0063] The cooling pipes can be designed as spiral or straight tubes and secured to the condensing unit via welding, threaded connections, or snap-on connections. Specifically, the cooling pipes can be arranged parallel to or spirally wound around the lower end of the diagonal baffles. To ensure close contact between the cooling pipes and the diagonal baffles, thermal pads or thermally conductive adhesive can be added between the cooling pipes and the baffles to improve heat transfer efficiency.

[0064] For example, if a spiral cooling pipe is used, one end of the pipe can be fixed to the inlet of the condensing unit and the other end can be fixed to the outlet. The middle part can be fixed to the inclined partition through a support frame to ensure the stability and uniform distribution of the pipe.

[0065] Furthermore, in the above technical solution, the condensing device 30 is a semi-cylindrical structure, and the cooling pipes or cooling fins are arranged along the semi-circular arc surface.

[0066] Furthermore, in the above technical solution, the air inlet 11 and the exhaust port 12 are respectively provided with filter screens, and the filter screens are matched with the air inlet 11 and the exhaust port 12 respectively.

[0067] Furthermore, in the above technical solution, the unloading device 10 also includes a dust outlet 40 for discharging the settled dust. The dust outlet 40 is equipped with a baffle, and a slide rail is provided on the side of the dust outlet 40. The baffle is slidably connected to the slide rail.

[0068] Furthermore, in the above technical solution, the dust outlet 40 is located below the partition 20 , close to the bottom of the discharge device 10 .

[0069] like Figure 1 、 Figure 3 、 Figure 5 As shown, it is a second embodiment of the optimized structure of an exhaust device for an internal mixer provided by the present invention. In this embodiment, it includes a feeding device 10, which is cylindrical. The feeding device 10 includes at least one air inlet 11 and at least one exhaust port 12. The air inlet 11 is arranged near the bottom of the feeding device 10, and the exhaust port 12 is located above the exhaust port 12 at a 90° angle. A partition 20 is provided at the central position of the interior of the feeding device 10. The partition 20 is used to divide the internal space of the feeding device 10 into two different areas. The partition 20 is arranged at an angle, including a high end and a low end. A condensing device 30 is provided at the low end of the partition 20. The condensing device 30 is used to condense and recover small molecular substances.

[0070] In the above technical solution, the vertical distance between the air inlet 11 and the bottom surface of the blanking device 10 accounts for 1 / 4 to 1 / 3 of the total height of the blanking device 10.

[0071] Furthermore, in the above technical solution, the horizontal angle formed between the exhaust port 12 and the air inlet 11 is 90 degrees, and the height of the exhaust port 12 is higher than the height of the air inlet 11 .

[0072] Furthermore, in the above technical solution, the angle formed by the partition 20 and the horizontal plane ranges from 15 degrees to 45 degrees.

[0073] Furthermore, in the above technical solution, the distance between the lower end of the partition 20 and the bottom inner wall of the blanking device 10 is not greater than 10 cm.

[0074] Furthermore, in the above technical solution, the condensing device 30 is provided with a cooling fin, which is installed inside the condensing device 30 and close to the lower end of the partition 20, and is used to reduce the temperature by heat exchange to achieve condensation of small molecular substances.

[0075] Fixing of cooling fins:

[0076] The cooling fins can be arranged in parallel or staggered and fixed inside the condensing unit by welding, riveting or bolting. The cooling fins can be close to the lower end of the inclined partition to maximize the heat exchange area.

[0077] For example, one end of the cooling fin can be fixed to the inner wall of the condensing unit and the other end can be fixed to the inclined partition to ensure close contact between the cooling fin and the partition. To enhance the fixing effect, a thermal pad or thermal conductive adhesive can be added between the cooling fin and the partition.

[0078] Furthermore, in the above technical solution, the condensing device 30 is a semi-cylindrical structure, and the cooling pipes or cooling fins are arranged along the semi-circular arc surface.

[0079] Furthermore, in the above technical solution, the air inlet 11 and the exhaust port 12 are respectively provided with filter screens, and the filter screens are matched with the air inlet 11 and the exhaust port 12 respectively.

[0080] Furthermore, in the above technical solution, the unloading device 10 also includes a dust outlet 40 for discharging the settled dust. The dust outlet 40 is equipped with a baffle, and a slide rail is provided on the side of the dust outlet 40. The baffle is slidably connected to the slide rail.

[0081] Furthermore, in the above technical solution, the dust outlet 40 is located below the partition 20 , close to the bottom of the discharge device 10 .

[0082] Specifically, the principle of the present utility model is:

[0083] Airflow path design:

[0084] Position of the air inlet and exhaust: The air inlet is located near the bottom of the cylindrical device, and the exhaust is located above it at a 90-degree angle. This design ensures that the air enters from the bottom, the dust settles under the action of gravity, and the air is discharged from the top, reducing air turbulence and improving the air-dust separation effect;

[0085] The function of the oblique partition: The oblique partition divides the internal space of the device into two areas. Dust settles under the partition under the action of gravity, and gas flows out from the other side of the partition. The angle design of the oblique partition (15 degrees to 45 degrees) ensures effective dust sedimentation while guiding gas out of the other side, improving separation efficiency.

[0086] Design of condensing unit:

[0087] Installation of cooling pipes or cooling fins: The condensing unit is installed at the lower end of the diagonal baffle, with the cooling pipes or cooling fins closely attached to the diagonal baffle, ensuring efficient heat exchange. The cooling pipes can be spiral or straight, and the cooling fins can be arranged in parallel or staggered. A cooling medium flows through the pipes, lowering the temperature through heat exchange to achieve condensation of small molecules.

[0088] Adjustment of dust outlet:

[0089] Manual rail adjustment: The dust outlet baffle is mounted on a rail. The operator can manually push or pull the baffle to move it along the rail, thereby changing the size of the dust outlet opening. This design is simple and intuitive, and is suitable for applications that require frequent manual operation.

[0090] Optimized design of the device:

[0091] Smooth inner wall treatment: The inner wall surface of the cylindrical device is smoothed to reduce dust adhesion, improve dust mobility, and reduce cleaning difficulty. This design extends the service life of the device and reduces maintenance costs;

[0092] Filter setting: Filters are installed at both the air inlet and the exhaust port to prevent large particles from entering or being discharged, thus protecting the cleanliness of the interior of the device and extending the service life of the device;

[0093] Dimensional Proportions: The diameter-to-height ratio of the cylindrical blanking device is designed to be 1:2 to 1:3, the length of the oblique baffle to the diameter of the cylindrical blanking device is designed to be 0.7 to 0.9, and the area ratio of the air inlet and exhaust ports is designed to be 1:1.5 to 1:2. These proportional designs ensure the device is reasonably sized, improve space utilization, optimize the gas flow path, and enhance the gas-dust separation effect.

Claims

1. An optimized structure of an exhaust device for an internal mixer, characterized in that: The invention comprises a feeding device (10), wherein the feeding device (10) is cylindrical and comprises at least one air inlet (11) and at least one exhaust port (12). The air inlet (11) is arranged near the bottom of the feeding device (10), and the exhaust port (12) is located above the exhaust port (12) at an angle of 90 degrees. A partition (20) is arranged at the central position of the interior of the feeding device (10), and the partition (20) is used to divide the internal space of the feeding device (10) into two different areas. The partition (20) is arranged at an angle and comprises a high end and a low end. A condensing device (30) is arranged at the low end of the partition (20), and the condensing device (30) is used to condense and recover small molecular substances.

2. The optimized structure of the exhaust device of an internal mixer according to claim 1, characterized in that: The vertical distance between the air inlet (11) and the bottom surface of the blanking device (10) accounts for 1 / 4 to 1 / 3 of the total height of the blanking device (10).

3. The optimized structure of the exhaust device of an internal mixer according to claim 2, characterized in that: The horizontal angle formed between the exhaust port (12) and the air inlet (11) is 90 degrees, and the height of the exhaust port (12) is higher than the height of the air inlet (11).

4. The optimized structure of the exhaust device of an internal mixer according to claim 3, characterized in that: The angle formed by the partition (20) and the horizontal plane ranges from 15 degrees to 45 degrees.

5. The optimized structure of the exhaust device of an internal mixer according to claim 4, characterized in that: The distance between the lower end of the partition (20) and the bottom inner wall of the blanking device (10) is no more than 10 cm.

6. The optimized structure of the exhaust device of an internal mixer according to claim 5, characterized in that: The condensing device (30) is provided with a cooling pipe or a cooling fin, which is installed inside the condensing device (30) and close to the lower end of the partition (20) to reduce the temperature by heat exchange to achieve condensation of small molecular substances.

7. The optimized structure of the exhaust device of an internal mixer according to claim 6, characterized in that: The air inlet (11) is arranged at the upper part of the condensing device (30), the condensing device (30) is a semi-cylindrical structure, and the cooling pipes or cooling fins are arranged along a semi-circular arc surface.

8. The optimized structure of the exhaust device of an internal mixer according to claim 7, characterized in that: The air inlet (11) and the air outlet (12) are respectively provided with filter screens, and the filter screens are matched with the air inlet (11) and the air outlet (12) respectively.

9. The optimized structure of the exhaust device of an internal mixer according to claim 8, characterized in that: The unloading device (10) further comprises a dust outlet (40) for discharging settled dust, the dust outlet (40) being equipped with a baffle, a slide rail being provided at a side position of the dust outlet (40), and the baffle being slidably connected to the slide rail.

10. The optimized structure of the exhaust device of an internal mixer according to claim 9, characterized in that: The dust outlet (40) is located below the partition (20), on the side opposite to the air inlet (11), and close to the bottom of the discharge device (10).

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