High-corrosion-resistance PVC spraying device for outer surface of battery pack

Abstract

The utility model relates to the technical field of surface corrosion prevention of battery packs, and discloses a high-corrosion-prevention PVC (polyvinyl chloride) spraying device for the outer surface of a battery pack, which comprises a spraying room, a cyclone separator, a powder supply center and a powder collecting and filtering box, an electrostatic spray gun which is used for spraying PVC powder to the battery pack from the two sides of the battery pack and can be adjusted in a lifting manner is arranged in the spray room; the cyclone separator is communicated with a dust inlet pipeline and a dust outlet pipeline, and a dust outlet in the bottom of the spraying room is communicated with the dust inlet pipeline; a powder supply pipe and a powder return pipe are arranged on the powder supply center, the powder supply pipe supplies PVC powder to the electrostatic spray gun, and the powder return pipe is connected with a bottom collection hopper of the cyclone separator; an exhaust fan and a rotary wing type filter are arranged in the powder collecting and filtering box; and gas discharged from the dust outlet pipeline is filtered by the rotary wing type filter and then is discharged through an air outlet A of the exhaust fan. According to the utility model, the quality and uniformity of a coating can be improved, and coating defects are avoided. Waste of PVC powder is reduced, and the material utilization rate is increased. The influence on the environment is reduced, and clean production is realized.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the battery package surface anticorrosive technical field, concretely relates to a kind of PVC spraying device for high anticorrosion of battery package outer surface. BACKGROUND

[0002] Battery package outer surface anticorrosion spraying process usually refers to the static spray gun in spray room is sprayed with PVC powder or liquid PVC on workpiece surface.This process uses static electricity to make PVC powder charged, then makes powder evenly adhere to workpiece surface by electrostatic adsorption, forms a layer of uniform, dense PVC coating after heating and solidification.After electrophoretic paint treatment, product surface will be sprayed with PVC, which can provide additional protective layer and enhance the corrosion resistance and stone impact resistance of product.PVC coating application not only can effectively protect electrophoretic paint film from impact of external sandstone and other hard objects, but also can improve the overall weather resistance and durability of product.

[0003] In the high anticorrosion PVC spraying technology of battery package outer surface, traditional spraying method may use manual or semi-automatic spraying mode, and spraying process may involve the following steps: first, operator fixes battery package on spraying table, then uses handheld spray gun to spray.In spraying process, operator needs to constantly adjust the position and angle of spray gun to ensure the uniformity of spraying.After spraying, PVC powder not adsorbed on the surface of battery package will be partially recycled, but the recycling efficiency is not high.Finally, sprayed battery package needs to be dried and cooled to solidify coating.

[0004] Manual spraying is difficult to ensure uniformity of coating on the outer surface of battery package, which may lead to uneven coating thickness and affect anticorrosion performance.Manual operation is slow, and high concentration is required during spraying process, which is easy to cause fatigue and affect production efficiency.Existing recycling system may not be efficient enough, leading to waste of a large amount of PVC powder and increase of production cost and environmental pollution.Lack of automated equipment makes it difficult to accurately control the position of spray gun and spraying process, and it is difficult to adapt to battery packages of different sizes and shapes.During manual spraying process, suspension of PVC powder may expose operator to harmful substances, which poses a safety hazard.

[0005] In summary, the existing high anticorrosion PVC spraying technology for battery package outer surface has many defects, including poor spraying uniformity, low production efficiency, low powder recycling rate, low automation level and safety hazards, etc.In view of this, we propose a PVC spraying device for high anticorrosion of battery package outer surface, which overcomes the shortcomings of existing technology by means of symmetrical arrangement of multiple spray guns, automatic lifting adjustment, efficient powder recycling and filtering system, etc., and improves spraying quality, production efficiency and environmental performance. SUMMARY

[0006] The present application aims to solve the technical problems of poor spraying uniformity, low production efficiency, low powder recovery rate, low automation level and safety hazards in the high corrosion-resistant PVC spraying of the outer surface of the battery pack in the prior art.

[0007] To achieve the above object, the utility model provides the following technical scheme:

[0008] A PVC spraying device for high corrosion resistance of the outer surface of a battery pack, comprising a spraying house for providing a spraying environment, a cyclone separator for separating and recovering PVC powder not adsorbed by the surface of the battery pack, a powder supply center for controlling and supplying PVC powder, and a powder collection and filtration box for filtering fine powder generated during the spraying process and purifying the discharged air.

[0009] The spraying house is provided with electrostatic spray guns that can be lifted and adjusted to spray PVC powder from both sides of the battery pack.

[0010] The cyclone separator is connected to a dust inlet pipe and a dust outlet pipe, and the dust outlet at the bottom of the spraying house is connected to the dust inlet pipe.

[0011] The powder supply center is provided with a powder supply pipe and a powder return pipe, the powder supply pipe supplies PVC powder to the electrostatic spray gun, and the powder return pipe is connected to the bottom of the cyclone separator.

[0012] The powder collection and filtration box is provided with an air extractor and a rotary wing filter, and the gas discharged from the dust outlet pipe is filtered by the rotary wing filter and then discharged through the air outlet A of the air extractor.

[0013] The PVC spraying device for high corrosion resistance of the outer surface of the battery pack can improve the quality and uniformity of the coating, avoid coating defects, reduce waste of PVC powder, improve material utilization, reduce environmental impact, and achieve clean production. The electrostatic spray gun precisely controls the spraying process, improving production efficiency.

[0014] As a preferred embodiment, the electrostatic spray guns arranged in two rows on both sides of the battery pack are arranged vertically at equal distances, and the electrostatic spray guns are installed on a horizontal panel, the end of the horizontal panel away from the electrostatic spray guns is sleeved on an external threaded rod and locked and fixed by a locking nut threaded on the external threaded rod.

[0015] The symmetrical arrangement of the electrostatic spray guns on both sides can achieve uniform spraying of the outer surface of the battery pack and improve the quality of the coating.

[0016] As a preferred embodiment, the external threaded rods connected to the two rows of electrostatic spray guns are connected to a lifting bracket, and the lifting bracket is connected to a two-dimensional lifting machine. The combination of the lifting bracket and the two-dimensional lifting machine can realize automatic adjustment of the spray guns and improve the automation level of the spraying process.

[0017] As a preferred, the two-dimensional elevator includes an X-axis linear module and a Z-axis linear module, the Z-axis linear module is fixed on the moving slide table of the X-axis linear module, and the lifting support is fixed on the moving table of the Z-axis linear module. The X-axis linear module and the Z-axis linear module can realize the movement of the spray gun in the horizontal and vertical directions, providing more adjustment freedom. The linear module usually has high motion accuracy, which helps to improve the spraying quality and uniformity. Automatic and accurate adjustment can reduce downtime in production and improve overall production efficiency.

[0018] As a preferred, the inside bottom of the spraying room is provided with an inverted V-shaped guide plate, which surrounds a guide opening for guiding the gas containing PVC powder between the inner bottom wall and the side wall of the spraying room. The gas discharged from the guide opening enters the gas outlet pipe opening inside the lower end of the inverted V-shaped guide plate, and the gas outlet pipe opening is connected with the dust inlet pipeline. The inverted V-shaped guide plate can effectively guide the flow direction of the gas containing PVC powder, ensure that the gas and powder can smoothly enter the gas outlet pipe opening, and reduce the scattering and deposition of the powder in the spraying room.

[0019] As a preferred, the partition plate A and the partition plate B inside the powder collecting filter box divide the powder collecting filter box into a filtering chamber, an air outlet chamber and an exhaust chamber, the rotary wing filter is installed in the filtering chamber, the exhaust fan is installed in the exhaust chamber, the air outlet B of the rotary wing filter is connected with the air outlet chamber, and the air inlet of the exhaust fan extends into the air outlet chamber. The partition plate A and the partition plate B divide the powder collecting filter box into different chambers, which helps to realize different functions such as filtering, air outlet and exhaust, so that the filtering system is more efficient and orderly.

[0020] As a preferred, a powder collecting barrel is arranged below the rotary wing filter in the filtering chamber. The powder collecting barrel is arranged below the rotary wing filter to collect the filtered PVC powder, facilitating subsequent recycling and processing.

[0021] Compared with the prior art, the technical effects and advantages of the utility model are:

[0022] The battery pack outer surface high corrosion resistant PVC spraying device sprays the battery pack uniformly through the symmetrical electrostatic spray guns in the spraying room, and uses the cyclone separator and the powder collecting filter box to effectively recover and filter the powder generated during spraying. This design not only ensures the uniformity and quality of the coating, but also improves the material utilization rate and production efficiency.

[0023] The battery pack outer surface high corrosion resistant PVC spraying device, the electrostatic spray guns on both sides of the spraying room can realize uniform spraying of the outer surface of the battery pack, and the stability and adjustability of the spray gun are ensured through the adjustment of the external thread rod and the locking nut, thereby improving the quality of the coating and the production efficiency. In addition, the design of the inverted V-shaped guide plate helps to effectively collect the powder, reduces environmental pollution and safety hazards.

[0024] The battery pack outer surface high corrosion-resistant PVC spraying device, the cyclone separator and the powder collecting filter box work cooperatively, efficiently process the PVC powder and fine powder generated in the spraying process through the centrifugal force and the filtering effect of the rotating wing filter, reduce the waste of powder, improve the material utilization rate, purify the discharged air, and realize clean production.

[0025] The battery pack outer surface high corrosion-resistant PVC spraying device, the combination of the lifting support and the two-dimensional elevator realizes the automatic adjustment of the spray gun, improves the automation degree and precision of the spraying process, enables the equipment to adapt to battery packs of different sizes and shapes, and increases the application range. The accurate control of the linear module further optimizes the spraying quality, reduces the downtime in production, and thus improves the overall production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0026] Fig. 1 It is a structural schematic view of the utility model;

[0027] Fig. 2 It is a structural schematic view of the spraying room of the utility model;

[0028] Fig. 3 It is a structural schematic view of the powder collecting filter box of the utility model.

[0029] In the figure: 1, spraying room; 2, battery pack; 3, electrostatic spray gun; 4, cyclone separator; 5, dust inlet pipeline; 6, dust outlet pipeline; 7, powder supply center; 8, powder supply pipe; 9, powder return pipe; 10, material collecting hopper; 11, powder collecting filter box; 12, air extractor; 13, rotating wing filter; 14, air outlet A; 15, horizontal panel; 16, external thread rod; 17, locking nut; 18, lifting support; 19, two-dimensional elevator; 1901, X-axis linear module; 1902, Z-axis linear module; 21, inverted V-shaped guide plate; 22, guide opening; 23, air outlet pipe opening; 24, partition A; 25, partition B; 26, filtering chamber; 27, air outlet chamber; 28, air exhaust chamber; 29, powder collecting barrel; 30, air outlet B; 31, air inlet. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0031] The following will be combined with the drawings in the embodiments of the utility model Figs. 1-3 The application will be further described in detail,

[0032] The application discloses a PVC spraying device for high corrosion prevention of the outer surface of a battery pack, which comprises a spraying room 1 for providing a spraying environment, a cyclone separator 4 for separating and recycling PVC powder not adsorbed by the surface of the battery pack 2, a powder supply center 7 for controlling and supplying the PVC powder, and a powder collection filter box 11 for filtering fine powder generated in the spraying process and purifying the discharged air.

[0033] The spraying room 1 is provided with electrostatic spray guns 3 that can be lifted and adjusted to spray PVC powder from both sides of the battery pack 2.

[0034] The electrostatic spray guns 3 arranged in two rows on both sides of the battery pack 2 are vertically arranged at equal distances, and the electrostatic spray guns 3 are installed on a horizontal panel 15, the end of the horizontal panel 15 away from the electrostatic spray guns 3 is sleeved on an outer threaded rod 16, and a locking nut 17 threadedly connected to the outer threaded rod 16 locks and fixes it.

[0035] The symmetrical arrangement of the electrostatic spray guns 3 on both sides can achieve uniform spraying of the outer surface of the battery pack 2 and improve the quality of the coating. The simultaneous operation of multiple spray guns can significantly improve the spraying efficiency and shorten the production cycle. The vertically arranged spray guns at equal distances can adapt to the size and shape of the battery pack 2 for spraying.

[0036] The horizontal panel 15 provides a stable support platform to ensure the stability of the spray guns during the spraying process. The height and position of the spray guns can be easily adjusted by the outer threaded rod 16 and the locking nut 17 to adapt to the spraying requirements of battery packs 2 of different sizes. The locking nut 17 can ensure that the spray guns do not shift during the spraying process due to vibration and other reasons, improving production safety.

[0037] The outer threaded rods 16 connected to the two rows of electrostatic spray guns 3 are connected to a lifting bracket 18, and the lifting bracket 18 is connected to a two-dimensional elevator 19.

[0038] The combination of the lifting bracket 18 and the two-dimensional elevator 19 can realize the automatic adjustment of the spray guns and improve the automation degree of the spraying process. The two-dimensional elevator 19 can accurately control the position of the spray guns to ensure the spraying precision and reduce the defects of the coating. The flexible adjustment of the lifting bracket 18 enables the spray guns to adapt to battery packs 2 of different sizes and shapes, increasing the application range of the equipment.

[0039] The two-dimensional elevator 19 includes an X-axis linear module 1901 and a Z-axis linear module 1902. The Z-axis linear module 1902 is fixed on the moving slide table of the X-axis linear module 1901, and the lifting support 18 is fixed on the moving slide table of the Z-axis linear module 1902. The X-axis linear module 1901 and the Z-axis linear module can realize the movement of the spray gun in the horizontal and vertical directions, providing more adjustment freedom. Linear modules generally have high motion accuracy, which helps to improve the quality and uniformity of spraying. Automated and precise adjustments can reduce downtime in production and improve overall production efficiency.

[0040] In addition, the spray room 1 is provided with a relief opening on both sides for the lifting movement of the horizontal panel 15. The lifting support 18 is provided with a baffle that slides along the outer wall of the spray room 1 and covers the relief opening. Within the stroke range of the lifting support 18, the baffle can cover the relief opening. The purpose is to prevent the leakage of PVC powder.

[0041] The inside bottom of the spray room 1 is provided with an inverted V-shaped guide plate 21. The inverted V-shaped guide plate 21 and the inner bottom wall and side wall of the spray room 1 form a guide opening 22 that guides the gas containing PVC powder. The gas discharged from the guide opening 22 enters the gas outlet pipe opening 23 inside the lower end of the inverted V-shaped guide plate 21. The gas outlet pipe opening 23 is connected to the dust inlet pipe 5. The inverted V-shaped guide plate 21 can effectively guide the flow of gas containing PVC powder, ensuring that the gas and powder can smoothly enter the gas outlet pipe opening 23, reducing the scattering and deposition of powder in the spray room 1. The design of the guide opening 22 helps to concentrate the gas flow, so that more PVC powder is guided to the gas outlet pipe opening 23, improving the collection efficiency of the powder. By effectively collecting the gas containing powder, the pollution to the interior of the spray room 1 and the working environment can be reduced. The reduction of suspended PVC powder in the air reduces the risk of explosion and fire.

[0042] The cyclone separator 4 is connected to the dust inlet pipe 5 and the dust outlet pipe 6. The dust outlet at the bottom of the spray room 1 is connected to the dust inlet pipe 5.

[0043] The powder supply center 7 is provided with a powder supply pipe 8 and a powder return pipe 9. The powder supply pipe 8 supplies PVC powder to the electrostatic spray gun 3, and the powder return pipe 9 is connected to the bottom collection hopper 10 of the cyclone separator 4.

[0044] The dust collection filter box 11 is provided with an exhaust fan 12 and a rotary wing filter 13. The gas discharged from the dust outlet pipe 6 is filtered by the rotary wing filter 13 and then discharged through the air outlet A14 of the exhaust fan 12.

[0045] The partition A24 and the partition B25 inside the powder collecting and filtering box 11 divide the powder collecting and filtering box 11 into a filtering chamber 26, an air outlet chamber 27 and an air exhaust chamber 28. The rotary-wing filter 13 is installed in the filtering chamber 26, and the air extractor 12 is installed in the air exhaust chamber 28. The air outlet B30 of the rotary-wing filter 13 is connected to the air outlet chamber 27, and the air inlet 31 of the air extractor 12 extends into the air outlet chamber 27. The partition A24 and the partition B25 divide the powder collecting and filtering box 11 into different chambers, which helps to achieve different functions such as filtering, air outlet and air exhaust, making the filtering system more efficient and orderly. The rotary-wing filter 13 is installed in a special filtering chamber 26, which helps to concentrate the treatment of powder-containing gas and improve the filtering efficiency. By installing the air extractor 12 in the air exhaust chamber 28, the airflow can be better controlled to ensure that the filtered gas can be smoothly discharged, reducing the impact of airflow on the filtering process. The chambers are separated, making it convenient to maintain and replace the rotary-wing filter 13 and the air extractor 12.

[0046] A powder collecting barrel 29 is arranged in the filtering chamber 26 below the rotary-wing filter 13.

[0047] The powder collecting barrel 29 is arranged below the rotary-wing filter 13 to collect the filtered PVC powder, facilitating subsequent recycling and processing. The powder collecting barrel 29 is designed to be easily detached from the powder collecting and filtering box 11 and transferred down, making it easy to detach and clean, reducing maintenance costs and downtime. By collecting the filtered PVC powder, it can be reused in production, improving material utilization and reducing costs. The arrangement of the powder collecting barrel 29 helps to reduce the leakage of powder into the environment, protecting the working environment and the health of employees.

[0048] The powder supply center 7 is responsible for delivering PVC powder to the electrostatic spray gun 3, and the powder supply pipe 8 delivers the powder to the electrostatic spray gun 3. The battery pack 2 is placed in the spraying room 1, and the electrostatic spray gun 3 is arranged in the spraying room 1 and can be adjusted in height. The spray gun generates static electricity through the electrostatic high-voltage generator to attract PVC powder to the outer surface of the battery pack 2. The height adjustment function of the spray gun can ensure that each part of the battery pack 2 is evenly sprayed. During operation, air containing PVC powder is sprayed from the spray gun and forms a suspended state in the spraying room 1. Part of the PVC powder adheres to the surface of the battery pack 2, and the other part of the unattached powder flows into the cyclone separator 4 with the air. In the cyclone separator 4, due to the action of centrifugal force, the heavier PVC powder is separated and falls along the wall into the collecting hopper 10, and the powder return pipe 9 returns the unused powder from the collecting hopper 10 of the cyclone separator 4 to the powder supply center 7 for reuse.

[0049] The gas from the cyclone separator 4 contains fine PVC powder, which is filtered through the turbofilter 13, which can capture fine powder and purify the gas. The suction generated by the air extractor 12 causes the gas to flow, and the filtered gas is discharged from the air outlet A 14.

[0050] The PVC spraying device for the outer surface of the battery pack with high corrosion resistance mainly relies on the cooperation of the spraying room 1, the electrostatic spray gun 3, the cyclone separator 4 and the powder collection filter box 11. The electrostatic spray gun 3 arranged symmetrically on both sides of the spraying room 1 can realize uniform spraying of the outer surface of the battery pack 2, and through the adjustment of the external threaded rod 16 and the locking nut 17, the stability of the spray gun is ensured. This design improves the quality and uniformity of the coating, reduces coating defects, and significantly improves production efficiency.

[0051] The cyclone separator 4 and the powder collection filter box 11 are responsible for processing the PVC powder and fine powder generated during spraying. The cyclone separator 4 separates heavier powder using centrifugal force, and the turbofilter 13 in the powder collection filter box 11 further filters fine powder to purify the discharged air. This efficient powder collection and processing method reduces waste of PVC powder, improves material utilization, reduces environmental impact, and achieves clean production.

[0052] In addition, the combination of the lifting bracket 18 and the two-dimensional elevator 19 realizes automatic adjustment of the spray gun, improves the automation level and precision of the spraying process, and enables the spray gun to adapt to battery packs 2 of different sizes and shapes, increasing the applicability of the equipment. Precise control of the linear module further optimizes the spraying quality, reduces downtime during production, and thus improves overall production efficiency.

[0053] The PVC spraying device for the outer surface of the battery pack with high corrosion resistance can improve the quality and uniformity of the coating, avoid coating defects, reduce waste of PVC powder, improve material utilization, reduce environmental impact, and achieve clean production. The spraying process is precisely controlled by the electrostatic spray gun 3, improving production efficiency.

[0054] Finally, it should be noted that the above description is only a preferred embodiment of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some technical features, as long as they fall within the spirit and principles of the present application. Any modification, equivalent substitution, improvement, etc. made within the scope of the present application shall be included in the protection scope of the present application.

Claims

1. A PVC spraying device for high corrosion resistance on the outer surface of a battery pack, characterized in that, include: Spray booth (1) is used to provide a spraying environment. Inside the spray booth (1) is an electrostatic spray gun (3) that can be raised and lowered to spray PVC powder onto the battery pack (2) from both sides. Cyclone separator (4) is used to separate and recover PVC powder that is not adsorbed on the surface of battery pack (2). The cyclone separator (4) is connected to dust inlet pipe (5) and dust outlet pipe (6). The dust outlet at the bottom of the spray booth (1) is connected to the dust inlet pipe (5). The powder supply center (7) is used to control and supply PVC powder. The powder supply center (7) is equipped with a powder supply pipe (8) and a powder return pipe (9). The powder supply pipe (8) supplies PVC powder to the electrostatic spray gun (3), and the powder return pipe (9) is connected to the bottom collection hopper (10) of the cyclone separator (4). The powder collection and filter box (11) is used to filter the fine powder generated during the spraying process and purify the exhaust air. The powder collection and filter box (11) is equipped with an exhaust fan (12) and a rotary wing filter (13). The gas coming out of the dust outlet pipe (6) is filtered by the rotary wing filter (13) and then discharged through the air outlet A (14) of the exhaust fan (12).

2. The PVC spraying device for high corrosion resistance on the outer surface of a battery pack according to claim 1, characterized in that: In the electrostatic spray guns (3) arranged in two rows on both sides of the battery pack (2), each row of electrostatic spray guns (3) is arranged vertically at equal distances, and the electrostatic spray guns (3) are installed on the horizontal panel (15). The end of the horizontal panel (15) away from the electrostatic spray guns (3) is fitted onto the external thread rod (16) and locked and fixed by the locking nut (17) threaded on the external thread rod (16).

3. The PVC spraying device for high corrosion resistance on the outer surface of a battery pack according to claim 2, characterized in that: The external threaded rod (16) connected to the two rows of electrostatic spray guns (3) is connected to the lifting bracket (18), and the lifting bracket (18) is connected to the two-dimensional lifting machine (19).

4. The PVC spraying device for high corrosion resistance on the outer surface of a battery pack according to claim 2, characterized in that: The two-dimensional lifting platform (19) includes an X-axis linear module (1901) and a Z-axis linear module (1902). The Z-axis linear module (1902) is fixed on the movable slide of the X-axis linear module (1901), and the lifting bracket (18) is fixed on the movable platform of the Z-axis linear module (1902).

5. The PVC spraying device for high corrosion resistance on the outer surface of a battery pack according to claim 1, characterized in that: The bottom inner side of the spray booth (1) is provided with an inverted V-shaped guide plate (21). The inverted V-shaped guide plate (21) and the inner bottom wall and side wall of the spray booth (1) form a guide port (22) for guiding gas containing PVC powder. The gas discharged from the guide port (22) enters the air outlet (23) on the inner side of the lower end of the inverted V-shaped guide plate (21). The air outlet (23) is connected to the dust inlet pipe (5).

6. The PVC spraying device for high corrosion resistance on the outer surface of a battery pack according to claim 1, characterized in that: The dust collection filter box (11) is divided into a filter chamber (26), an air outlet chamber (27), and an exhaust chamber (28) by partitions A (24) and B (25) inside the dust collection filter box (11). A rotary vane filter (13) is installed in the filter chamber (26), and an exhaust fan (12) is installed in the exhaust chamber (28). The air outlet B (30) of the rotary vane filter (13) is connected to the air outlet chamber (27), and the air inlet (31) of the exhaust fan (12) extends into the air outlet chamber (27).

7. A PVC spraying device for high corrosion resistance on the outer surface of a battery pack according to claim 6, characterized in that: A dust collection bucket (29) is provided inside the filter chamber (26) and below the rotary vane filter (13).

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