High-safety charging station box transformer

Abstract

The application discloses a high-safety charging station box transformer and relates to the technical field of box transformer cooling, which comprises a box body, a semicircular cylinder and an arc-shaped cylinder are arranged in the box body, the two ends of the semicircular cylinder and the arc-shaped cylinder are connected, a condensation plate is arranged on the top of the semicircular cylinder, annular grooves are formed in the annular inner surfaces of the semicircular cylinder and the arc-shaped cylinder, rotating members are slidably connected in the annular grooves, a plurality of water absorbing members are arranged on the annular surface of the rotating member, the water absorbing member annular surface is in contact with the condensation plate, one end of an air inlet pipe away from the box body is communicated with the semicircular cylinder, and exhaust holes are formed in the side of the semicircular cylinder away from the air inlet pipe. The application condenses the entering air by the condensation plate, then absorbs the condensed water by the water absorbing cotton, keeps the condensation plate continuously drying the water in the air, and ensures the continuous water absorption of the water absorbing cotton by extruding the water absorbed on the water absorbing cotton when the water absorbing cotton moves to the arc-shaped cylinder due to the connection of the water absorbing cotton and the rotating structure.

Description

Technical Field

[0001] This invention relates to the field of prefabricated substation cooling technology, specifically a high-safety charging station prefabricated substation. Background Technology

[0002] A prefabricated substation, also known as a prefabricated transformer substation, is a factory-prefabricated, compact indoor or outdoor power distribution device that integrates high-voltage switchgear, distribution transformers, and low-voltage power distribution equipment according to a specific wiring scheme. It organically combines the high-voltage, low-voltage, and power distribution functions of the transformer into a moisture-proof, rust-proof, dust-proof, rodent-proof, fire-proof, theft-proof, heat-insulated, fully enclosed, and movable steel structure box. It is suitable for mines, factories, oil and gas fields, and wind power stations.

[0003] Because transformers generate a lot of heat during operation, if it is not dissipated in time, it will affect the transformer's load capacity. Therefore, most transformer cabinet doors are equipped with heat dissipation windows. In order to meet the requirements of waterproofing and dustproofing, these heat dissipation windows must be made into louvered structures. Moreover, these heat dissipation windows also serve as air inlets and outlets, affecting the heat dissipation efficiency of the enclosure. Summary of the Invention

[0004] The purpose of this invention is to provide a highly safe charging station transformer to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a high-safety charging station transformer substation, comprising a housing, wherein an air inlet and an air outlet are respectively provided on the upper side of the housing and at the bottom of the housing, an air inlet pipe is installed in the air inlet, a fan is installed in the air inlet pipe, a semi-cylinder and an arc-shaped cylinder are installed inside the housing, the two ends of the semi-cylinder and the arc-shaped cylinder are connected, a condenser plate is installed on the top of the semi-cylinder, and an annular groove is provided on the inner surface of both the semi-cylinder and the arc-shaped cylinder, a rotating component is slidably connected in the annular groove, the rotating component extends into the air inlet pipe, a plurality of water-absorbing components are installed on the annular surface of the rotating component, the water-absorbing components are in contact with the condenser plate, the end of the air inlet pipe away from the housing is connected to the semi-cylinder, and an exhaust port is provided on the side of the semi-cylinder away from the air inlet pipe.

[0006] Furthermore, the rotating component includes a rotating cylinder, which is concentrically arranged in the area formed by the semi-cylindrical cylinder and the arc-shaped cylinder. One end of the rotating cylinder extends into the air intake pipe. Multiple rotating blades are installed on the annular surface of the rotating cylinder at one end inside the air intake pipe. A circular ring is rotatably connected in the annular groove. Multiple connecting cylinders are installed on the annular surface of the rotating cylinder. The connecting cylinders are connected to the circular rings. A water-absorbing component is inserted into the end of the connecting cylinder away from the rotating cylinder.

[0007] Furthermore, the absorbent component includes a movable cylinder, one end of which passes through a circular ring and slides in contact with the annular surface of the connecting cylinder. A U-shaped cylinder is installed at the end of the movable cylinder away from the rotating cylinder. Absorbent cotton is disposed inside the U-shaped cylinder and is in contact with a condensation plate. A squeezing plate is installed at the end of the U-shaped cylinder away from the movable cylinder and is connected to the absorbent cotton.

[0008] Furthermore, a support rod is installed on the side of the extrusion plate facing the connecting cylinder. The support rod passes through the absorbent cotton and extends into the connecting cylinder. A sealing plate is installed at one end of the support rod inside the connecting cylinder. A water flow groove is formed on the annular inner surface of the connecting cylinder, and the sealing plate is in indirect contact with the water flow groove.

[0009] Furthermore, a slider is installed on the side of the extrusion plate away from the absorbent cotton, and grooves are provided on the inner surfaces of both the semi-cylindrical and the arc-shaped cylinder, with the slider slidably connected within the grooves.

[0010] Furthermore, a groove is provided at the top of the arc-shaped cylinder, and an intercepting plate is hinged in the groove. An elastic element is installed at the end of the intercepting plate away from the groove, and the end of the elastic element away from the intercepting plate is installed in the groove.

[0011] Furthermore, a spiral tube is rotatably connected to the lower end of the rotating cylinder, and a conical cylinder is installed at the bottom of the box. The end of the conical cylinder away from the air outlet is connected to the spiral tube. A circular hole is opened at the bottom of the conical cylinder, and a lifting cylinder is installed in the circular hole. The lifting cylinder is positioned above the air outlet. Multiple exhaust grooves are opened on the upper side of the annular surface of the lifting cylinder. Multiple through holes are opened on the annular surface of the conical cylinder, and an exhaust pipe is installed in the through holes. The exhaust pipe extends to the bottom of the conical cylinder.

[0012] Furthermore, a temperature detector is installed inside the conical cylinder.

[0013] Furthermore, an intercepting net is installed inside the exhaust duct.

[0014] Furthermore, a rainproof canopy is installed on the top of the box, and an air intake slot is provided where the rainproof canopy contacts the box, with a dustproof net installed inside the air intake slot.

[0015] This invention provides a high-safety charging station transformer, which has the following advantages: This high-safety charging station transformer, through the cooperation of multiple components, not only can...

[0016] 1. This invention installs a condensing plate inside a semi-cylinder to condense the incoming air. A water-absorbing cotton then absorbs the condensate, ensuring the condensing plate continuously dries the air. Furthermore, because the water-absorbing cotton is connected to a rotating structure consisting of a connecting cylinder, a rotating cylinder, and rotating blades via a U-shaped cylinder and a moving cylinder, it continuously absorbs the condensate on the condensing plate. When the rotating structure moves the water-absorbing cotton to the arc-shaped cylinder, the absorbed water is squeezed, ensuring the cotton's continued absorbency.

[0017] 2. In this invention, the condensate absorbed by the absorbent cotton is transported to the rotating cylinder through the connecting cylinder, and then discharged through the spiral tube. During the discharge of the condensate, the spiral tube can come into contact with the high-temperature gas inside the box, which accelerates the temperature drop inside the box. After the condensate drips into the conical cylinder, it comes into contact with the hot air discharged from the box, which accelerates the evaporation rate of the hot air and thus increases the rate at which the temperature around the box drops.

[0018] 3. The present invention installs a temperature detector inside the conical cylinder. Since the gas inside the box comes into contact with the water inside the conical cylinder before being discharged from the box, and changes the water temperature inside the conical cylinder, the water temperature inside the conical cylinder can be used to determine the air temperature inside the box. The temperature detector detects the water temperature inside the conical cylinder, making the detection of the air temperature inside the box more accurate. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a high-safety charging station transformer according to the present invention;

[0020] Figure 2 This is a schematic diagram of the assembly of the arc-shaped cylinder and the semi-circular cylinder of a high-safety charging station transformer according to the present invention.

[0021] Figure 3 This is a schematic diagram of the assembly of the rotating cylinder and rotating blade of a high-safety charging station transformer in the air intake pipe according to the present invention.

[0022] Figure 4 This is a schematic diagram of the assembly of the spiral tube and conical cylinder of a high-safety charging station transformer according to the present invention.

[0023] Figure 5 This is a schematic cross-sectional view of the conical cylinder of a high-safety charging station transformer according to the present invention.

[0024] Figure 6 This is a schematic diagram of the assembly of absorbent cotton in an arc-shaped cylinder and a semi-circular cylinder for a high-safety charging station transformer according to the present invention.

[0025] Figure 7 This is an assembly diagram of the moving cylinder, U-shaped cylinder, support rod, extrusion plate and connecting cylinder of a high-safety charging station transformer according to the present invention;

[0026] Figure 8 This is a schematic diagram of the assembly of the interceptor plate, elastic element and arc-shaped cylinder of a high-safety charging station transformer according to the present invention.

[0027] In the diagram: 1. Box body; 2. Dustproof net; 3. Rainproof canopy; 4. Air outlet; 5. Air inlet pipe; 6. Rotating cylinder; 7. Moving cylinder; 8. Arc-shaped cylinder; 9. Exhaust port; 10. Semi-cylinder; 11. Connecting cylinder; 12. Rotating blade; 13. Spiral tube; 14. Conical cylinder; 15. Exhaust pipe; 16. Interception net; 17. Elevating cylinder; 18. Condensing plate; 19. Slide groove; 20. Absorbent cotton; 21. U-shaped cylinder; 22. Extrusion plate; 23. Sealing plate; 24. Support rod; 25. Water channel; 26. Slider; 27. Interception plate; 28. Elastic element. Detailed Implementation

[0028] Please see Figures 1 to 8 The present invention provides a technical solution: a high-safety charging station transformer, comprising a box body 1, wherein an air inlet and an air outlet 4 are respectively provided on the upper side of the box body 1 and at the bottom of the box body 1, an air inlet pipe 5 is installed in the air inlet, and a fan is installed in the air inlet pipe 5. When the fan is started, air outside the box body 1 is drawn into the box body 1 to replace the high-temperature air inside the box body 1 and achieve a cooling effect. A semi-cylinder 10 and an arc-shaped cylinder 8 are installed inside the box body 1, and the two ends of the semi-cylinder 10 and the arc-shaped cylinder 8 are connected. The end of the air inlet pipe 5 away from the box body 1 is connected to the semi-cylinder 10, and an exhaust port 9 is provided on the side of the semi-cylinder 10 away from the air inlet pipe 5.

[0029] A condenser plate 18 is installed at the top of the semi-cylinder 10. When the condenser plate 18 is energized, its temperature decreases, condensing the moisture in the air and adhering it to the lower surface of the condenser plate 18, thereby drying the air. Both the semi-cylinder 10 and the arc-shaped cylinder 8 have annular grooves on their inner surfaces. A circular ring is slidably connected in the annular groove. A rotating cylinder 6 is installed inside the circular ring. The rotating cylinder 6 is concentrically arranged in the area formed by the semi-cylinder 10 and the arc-shaped cylinder 8. One end of the rotating cylinder 6 extends into the air intake pipe 5. Multiple rotating blades 12 are installed on the annular surface of the rotating cylinder 6 at one end inside the air intake pipe 5. Multiple connecting cylinders 11 are installed on the annular surface of the rotating cylinder 6. The connecting cylinders 11 are connected to the circular ring. When the fan draws in air, the airflow drives the rotating blades 12 to rotate, which in turn drives the rotating cylinder 6 to rotate. The rotation of the rotating cylinder 6 drives the connecting cylinders 11 and the circular ring to rotate.

[0030] A movable cylinder 7 that passes through the annular ring is sleeved on the annular surface of the connecting cylinder 11. A U-shaped cylinder 21 is installed at the end of the movable cylinder 7 away from the rotating cylinder 6. A water-absorbing cotton 20 is provided inside the U-shaped cylinder 21. The water-absorbing cotton 20 is in contact with the condenser plate 18. A squeezing plate 22 is installed at the end of the U-shaped cylinder 21 away from the movable cylinder 7. The squeezing plate 22 is connected to the water-absorbing cotton 20.

[0031] When the connecting cylinder 11 rotates, it drives the U-shaped cylinder 21 and the absorbent cotton 20 set in the U-shaped cylinder 21 to rotate through the moving cylinder 7. The absorbent cotton 20 rotates and comes into contact with the condenser plate 18, absorbing the condensate on the lower surface of the condenser plate 18 and keeping the condenser plate 18 continuously drying the moisture in the air. When the absorbent cotton 20 rotates into the arc-shaped cylinder 8, the distance between the arc-shaped cylinder 8 and the rotating tube becomes shorter. The squeezing plate 22 gradually moves closer to the ring and squeezes the absorbent cotton 20, squeezing out the water absorbed in the absorbent cotton 20 and ensuring the continuous water absorption of the absorbent cotton 20.

[0032] A support rod 24 is installed on the side of the extrusion plate 22 facing the connecting cylinder 11. The support rod 24 passes through the absorbent cotton 20 and extends into the connecting cylinder 11. A sealing plate 23 is installed at one end of the support rod 24 inside the connecting cylinder 11. A water flow groove 25 is opened on the annular inner surface of the connecting cylinder 11. The sealing plate 23 is in indirect contact with the water flow groove 25.

[0033] When the absorbent cotton 20 does not reach the closest point to the rotating cylinder 6 within the semi-cylinder 10 and the arc-shaped cylinder 8, the sealing plate 23 does not contact the water flow channel 25. At this time, the water squeezed out by the absorbent cotton 20 within the arc-shaped cylinder 8 is temporarily stored in the U-shaped cylinder 21. When the absorbent cotton 20 reaches the closest point to the rotating cylinder 6 within the arc-shaped cylinder 8, the sealing plate 23 contacts the water flow channel 25. At this time, the water in the U-shaped cylinder 21 flows into the rotating cylinder 6 through the connecting cylinder 11. When the absorbent cotton 20 is removed from the closest point to the rotating cylinder 6 within the arc-shaped cylinder 8, the sealing plate 23 re-seals the connecting cylinder 11.

[0034] The lower end of the rotating cylinder 6 is rotatably connected to the spiral tube 13. A conical cylinder 14 is installed at the bottom of the box body 1. The end of the conical cylinder 14 away from the air outlet is connected to the spiral tube 13. A circular hole is opened at the bottom of the conical cylinder 14. A lifting cylinder 17 is installed in the circular hole. The lifting cylinder 17 is positioned above the air outlet 4. Multiple exhaust grooves are opened on the upper side of the annular surface of the lifting cylinder 17. An intercepting net 16 is installed in the exhaust grooves to prevent snakes, insects, etc. from entering the box body 1 through the air outlet 4. Multiple through holes are opened on the annular surface of the conical cylinder 14. An exhaust pipe 15 is installed in the through holes and extends to the bottom of the conical cylinder 14.

[0035] Outside air enters the chamber 1 after being dried and cooled by the condenser plate 18. The hot air inside the chamber 1 is squeezed into the through hole. The condensate absorbed by the absorbent cotton 20 is transported to the rotating cylinder 6 through the connecting tube 11, and then discharged through the spiral tube 13 and drips into the conical cylinder 14. During the discharge of condensate, the spiral tube 13 can come into contact with the high-temperature gas inside the chamber 1, accelerating the temperature drop inside the chamber 1. After the condensate drips into the conical cylinder 14, it comes into contact with the hot air discharged from the chamber 1, accelerating the evaporation rate of the hot air, thereby increasing the rate at which the temperature around the chamber 1 drops.

[0036] A temperature detector is installed inside the conical cylinder 14. Since the gas in the chamber 1 comes into contact with the water in the conical cylinder 14 before exiting the chamber 1, and changes the water temperature in the conical cylinder 14, the water temperature in the conical cylinder 14 can be used to determine the air temperature inside the chamber 1. The temperature detector detects the water temperature in the conical cylinder 14, making the detection of the air temperature inside the chamber 1 more accurate.

[0037] A slider 26 is installed on the side of the extrusion plate 22 away from the absorbent cotton 20. The inner surface of the semi-cylindrical cylinder 10 and the arc-shaped cylinder 8 are both provided with grooves 19. The slider 26 is slidably connected in the groove 19. The slider 26 is used to restrict the position of the extrusion plate 22, so that the absorbent cotton 20 can be moved away from the arc-shaped cylinder 8 at the position closest to the rotating cylinder 6 and its position is restored.

[0038] The top of the arc-shaped cylinder 8 has a groove, and an intercepting plate 27 is hinged in the groove. An elastic element 28 is installed at the end of the intercepting plate 27 away from the groove. The elastic element 28 is a spring and is in a compressed state. The end of the elastic element 28 away from the intercepting plate 27 is installed in the groove. Before the U-shaped cylinder 21 contacts the intercepting plate 27, the intercepting plate 27 seals the arc-shaped cylinder 8, so that the air entering the box 1 can only be discharged through the semi-cylinder 10. When the U-shaped cylinder 21 contacts the intercepting plate 27, it is squeezed and deflected into the groove. After the U-shaped cylinder 21 is removed from the groove, the intercepting plate 27 is squeezed by the elastic element 28 and re-seals the arc-shaped cylinder 8.

[0039] A rain shelter 3 is installed on top of the housing 1. An air intake slot is provided at the contact point between the rain shelter 3 and the housing 1. A dustproof net 2 is installed in the air intake slot. The rain shelter 3 prevents rainwater from directly entering the air intake pipe 5 on rainy days. The dustproof net 2 intercepts dust in the air during the air intake process to ensure that the air inside the housing 1 is clean. After the fan is started, the air first enters the triangular area between the housing 1 and the rain shelter 3 through the air intake slot, and then enters the housing 1 through the air intake pipe 5.

[0040] In summary, this high-safety charging station transformer, when in use, first starts the fan, allowing outside air to enter the space formed by the upper surface of the box 1 and the lower surface of the rainproof canopy 3 through the air inlet slot, then enters the air inlet pipe 5 through the air inlet hole, and then enters the semi-cylinder 10 through the air inlet pipe 5. Then, the condenser plate 18 is activated to condense the moisture in the incoming air onto the condenser plate 18, thus drying the air. When the air flows in the air inlet pipe 5, it drives the rotating blade 12 to rotate. The rotation of the rotating blade 12 drives the rotating cylinder 6 to rotate. The rotation of the rotating cylinder 6 drives the water-absorbing cotton 20 to rotate in the semi-cylinder 10 and the arc-shaped cylinder 8 through the connecting cylinder 11, the U-shaped cylinder 21 and the moving cylinder 7, and absorbs the water condensed on the condenser plate 18.

[0041] When the absorbent cotton 20 rotates to the arc-shaped cylinder 8, the inner wall of the arc-shaped cylinder 8 presses against the extrusion plate 22, causing the extrusion plate 22 to press against the absorbent cotton 20 and squeeze the water absorbed by the absorbent cotton 20 into the U-shaped cylinder 21. As the absorbent cotton 20 gradually rotates to the point in the arc-shaped cylinder 8 closest to the rotating cylinder 6, the sealing plate 23 contacts the water trough 25. At this time, the water in the U-shaped cylinder 21 flows into the rotating cylinder 6 through the connecting cylinder 11. When the absorbent cotton 20 is removed from the point in the arc-shaped cylinder 8 closest to the rotating cylinder 6, the sealing plate 23 re-seals the connecting cylinder 11. The condensate entering the rotating cylinder 6 first enters the spiral tube 13 and comes into contact with the hot air in the box 1 to cool the hot air in the box 1, and then falls into the conical cylinder 14.

[0042] Outside air enters the semi-cylindrical 10, is dried, and then exits through the exhaust port 9. It then replaces the hot air inside the chamber 1 and forces the hot air inside the chamber 1 into the conical cylinder 14. When the hot air enters the conical cylinder 14, it comes into contact with the water inside the conical cylinder 14, causing the water temperature inside the conical cylinder 14 to rise. At this time, the temperature detector detects the water temperature and determines the temperature inside the chamber 1. Then it is discharged from the raised cylinder 17. Because the hot air comes into contact with the water inside the conical cylinder 14, the hot air carries some water when it is discharged. When the hot air is discharged from the chamber 1, the evaporation rate is accelerated, which in turn accelerates the temperature drop around the chamber 1.

[0043] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A high-safety charging station box transformer, comprising a box body (1), characterized in that, The box (1) upper side position and the box (1) inner bottom are respectively provided with air inlet hole and air outlet hole (4), the air inlet hole is provided with air inlet pipe (5), the air inlet pipe (5) is provided with fan, the box (1) is provided with semicircular cylinder (10) and arc cylinder (8), the both ends of semicircular cylinder (10) and arc cylinder (8) are connected, the semicircular cylinder (10) is provided with condensation plate (18) on the top, the semicircular cylinder (10) and arc cylinder (8) annular inner surface are provided with annular groove, the annular groove is slidably connected with rotating part, the rotating part extends to the air inlet pipe (5), the rotating part annular surface is provided with a plurality of water absorbing parts, the water absorbing parts are in contact with condensation plate (18), the air inlet pipe (5) is communicated with semicircular cylinder (10) away from the box (1), the semicircular cylinder (10) is provided with air outlet hole (9) away from the air inlet pipe (5), the rotating part includes rotating cylinder (6), the rotating cylinder (6) is concentrically arranged in the area formed by semicircular cylinder (10) and arc cylinder (8), one end of the rotating cylinder (6) extends into the air inlet pipe (5), the rotating cylinder (6) annular surface is provided with a plurality of rotating leaves (12) at one end in the air inlet pipe (5), the annular groove is rotatably connected with a circular ring, the rotating cylinder (6) annular surface is provided with a plurality of connecting cylinders (11), the connecting cylinders (11) are connected with the circular ring, the connecting cylinder (11) is inserted with a water absorbing part away from the rotating cylinder (6), the water absorbing part includes moving cylinder (7), one end of the moving cylinder (7) passes through the circular ring and is in sliding contact with the connecting cylinder (11) annular surface, the moving cylinder (7) is provided with U-shaped cylinder (21) away from the rotating cylinder (6), the U-shaped cylinder (21) is provided with water absorbing cotton (20), the water absorbing cotton (20) is in contact with the condensation plate (18), the U-shaped cylinder (21) is provided with extrusion plate (22) away from the moving cylinder (7), the extrusion plate (22) is connected with the water absorbing cotton (20).

2. The high-security charging station box transformer of claim 1, wherein, The extrusion plate (22) side facing the connecting cylinder (11) is provided with a support rod (24), the support rod (24) passes through the water absorbing cotton (20) and extends into the connecting cylinder (11), the support rod (24) is provided with a sealing plate (23) at one end in the connecting cylinder (11), the connecting cylinder (11) annular inner surface is provided with water flow groove (25), the sealing plate (23) is indirectly contacted with the water flow groove (25).

3. The high-security charging station box transformer of claim 2, wherein, The extrusion plate (22) side away from the water absorbing cotton (20) is provided with a sliding block (26), the semicircular cylinder (10) and arc cylinder (8) annular inner surface are provided with sliding groove (19), the sliding block (26) is slidably connected in the sliding groove (19).

4. The high-security charging station box transformer of claim 3, wherein, The arc cylinder (8) inner top is provided with a groove, the groove is hingedly connected with an intercepting plate (27), one end of the intercepting plate (27) away from the groove is provided with an elastic element (28), one end of the elastic element (28) away from the intercepting plate (27) is installed in the groove.

5. The high-security charging station box transformer of claim 2, wherein, The lower end of the rotating cylinder (6) is rotationally connected with a spiral pipe (13), the inner bottom of the box (1) is mounted with a conical cylinder (14), one end of the conical cylinder (14) away from the air outlet is connected with the spiral pipe (13), the inner bottom of the conical cylinder (14) is provided with a round hole, the round hole is mounted with a lifting cylinder (17), the lifting cylinder (17) is arranged above the air outlet (4), a plurality of exhaust grooves are formed on the upper side of the annular surface of the lifting cylinder (17), a plurality of through holes are formed on the annular surface of the conical cylinder (14), the through holes are mounted with exhaust pipes (15), and the exhaust pipes (15) extend to the inner bottom of the conical cylinder (14).

6. The high-security charging station box transformer of claim 5, wherein, The conical cylinder (14) is mounted with a temperature detector.

7. The high-security charging station box transformer of claim 5, wherein, The exhaust grooves are mounted with intercepting nets (16).

8. The high-security charging station box transformer of claim 1, wherein, The upper side of the box (1) is mounted with a rainproof shed (3), the rainproof shed (3) is provided with an air inlet groove at the contact position with the box (1), and the air inlet groove is mounted with a dust screen (2).

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