Aluminum bar cooling system with anti-blocking and self-cleaning functions

Abstract

The application provides an aluminum bar cooling system with anti-blocking and self-cleaning functions, which comprises a box body, a cooling cavity in the box body, a conveying unit arranged in the box body for conveying aluminum bars, an upper spraying unit and a lower spraying unit arranged on the upper and lower sides of the conveying unit respectively, the lower spraying unit comprising a spraying pipe arranged in the cooling cavity, the spraying pipe being communicated with a water storage unit arranged on one side of the box body, a plurality of nozzles arranged on the outer wall of the spraying pipe, and at least one spray hole arranged on each nozzle, a hole cleaning assembly arranged on the spraying pipe and corresponding to the number of the nozzles, one end of the hole cleaning assembly being aligned with the spray holes and the other end of the hole cleaning assembly extending out of the spraying pipe, and a power transmission assembly arranged in the box body.

Description

Technical Field

[0001] This invention relates to the field of aluminum rod processing equipment, and more particularly to an aluminum rod cooling system with anti-clogging and self-cleaning functions. Background Technology

[0002] After extrusion molding, aluminum bars typically require spray cooling to achieve the desired microstructure and properties. Existing aluminum bar cooling systems mostly employ a spray cooling structure, using nozzles arranged within a cooling chamber to spray coolant onto the surface of the conveying aluminum bar to achieve temperature reduction. To improve cooling uniformity, some systems have upper and lower spray units on the upper and lower sides of the aluminum bar conveying channel, respectively. The upper spray unit sprays the top of the aluminum bar, while the lower spray unit sprays the bottom.

[0003] Because the lower spray unit is located below the aluminum rod, its nozzles are positioned lower, making it easier for impurities and particles in the coolant to deposit at the nozzles under gravity. Over time, these impurities tend to adhere and accumulate on the inner walls of the nozzles, leading to blockages. In contrast, the nozzles of the upper spray unit are positioned higher and are less affected by gravity-induced deposition, resulting in less noticeable blockages.

[0004] To address the issue of nozzle clogging in the lower spray unit, some existing technologies propose solutions such as installing removable filters at the nozzles or periodic manual cleaning. However, filters can only delay clogging and cannot fundamentally solve the problem of impurities adhering to the inner wall of the nozzles; manual cleaning requires machine downtime, affecting production efficiency, and the cleaning cycle is difficult to control accurately. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an aluminum rod cooling system with anti-clogging and self-cleaning functions, which solves the problem that the spray nozzles of the upper and lower spray units in existing aluminum rod cooling systems are prone to clogging and require shutdown for cleaning, thus affecting production efficiency.

[0006] According to an embodiment of the present invention, an aluminum rod cooling system with anti-clogging and self-cleaning function includes: a housing, the interior of which is a cooling chamber, a horizontal conveying channel extending through the housing, a conveying unit for conveying aluminum rods within the housing, and an upper spraying unit and a lower spraying unit located on the upper and lower sides of the conveying unit respectively within the housing. The lower spraying unit includes: a spray pipe disposed within the cooling chamber, the spray pipe being connected to a water storage unit located on one side of the housing, and a plurality of nozzles disposed on the outer wall of the spray pipe, each nozzle having at least one spray hole; a cleaning assembly disposed on the spray pipe and corresponding to the number of nozzles, one end of the cleaning assembly being aligned with the spray hole, and the other end extending out of the spray pipe, the cleaning assembly being dynamically sealed to the spray pipe; and a power transmission assembly disposed within the housing for driving the cleaning assembly to clean the spray holes on the corresponding nozzles.

[0007] Compared to existing technologies, this invention offers the following advantages: By installing a cleaning component corresponding to the nozzle in the lower spray unit, with one end aligned with the spray hole and the other end extending out of the spray pipe, and cooperating with a power transmission component located within the housing to drive the cleaning component, online automatic cleaning of the spray holes is achieved. During normal operation of the cooling system, clogged spray holes can be cleared periodically or as needed without stopping the machine, ensuring continuous and uniform spraying. This guarantees consistent cooling performance of the aluminum rods and product quality, while significantly reducing the frequency of manual maintenance and improving production efficiency.

[0008] Furthermore, the conveying unit includes several conveying rollers rotatably disposed within the housing and a drive motor for driving the conveying rollers to rotate, the drive motor being disposed at the back of the housing.

[0009] Furthermore, the cleaning assembly includes a sliding rod, a mounting rod, and a cleaning head. The mounting rod is located inside the nozzle, and the cleaning head is disposed on the side of the mounting rod facing the nozzle. One end of the sliding rod is fixed to the side of the mounting rod away from the nozzle, and the other end of the sliding rod extends through the inner wall of the spray pipe. The sliding rod is dynamically sealed to the spray pipe.

[0010] Furthermore, a mounting plate is fixedly installed at one end of the sliding rod outside the spray pipe, and a first return spring is provided between the mounting plate and the inner wall of the spray pipe. Under the elastic force of the first return spring, the cleaning head remains away from the spray hole.

[0011] Furthermore, the power transmission assembly includes a drive base and a drive shaft. The drive base is rotatably disposed in the cooling chamber via the drive shaft. The outer wall of the drive base is an elliptical cylindrical surface. A servo motor for driving the drive shaft to rotate is disposed on the outer wall of the housing. An inclined surface is disposed on the side wall of the end of the sliding rod that extends out of the spray pipe. The drive base is used to push the inclined surface to move the sliding rod toward the nozzle.

[0012] Furthermore, a drain outlet is provided at the bottom of the housing, a drain pipe is connected to the drain outlet, a filter screen is provided at the drain outlet, and a pushing component is provided on one side of the filter screen, the pushing component being used to push away impurities accumulated on the top of the filter screen.

[0013] Furthermore, the pushing assembly includes: a mounting cylinder fixed to the inner wall of the cooling chamber, the interior of the mounting cylinder being a mounting groove, a transmission rod slidably disposed within the mounting groove, one end of the transmission rod extending horizontally out of the mounting cylinder, and a vertical pushing seat disposed at the other end of the transmission rod extending out of the mounting cylinder, the bottom of the pushing seat being in close contact with the bottom of the cooling chamber, the top of the filter screen being on the same horizontal plane as the bottom of the cooling chamber, the pushing seat being located on one side of the filter screen, and the side wall of the pushing seat also being provided with an inclined surface, the driving seat being used to cooperate with the inclined surface to drive the pushing seat to slide within the cooling chamber.

[0014] Furthermore, a fixing plate is provided on the transmission rod, the fixing plate is located in the mounting groove, and a second return spring is provided between the side wall of the fixing plate away from the push seat and the inner wall of the mounting groove. Under the elastic force of the second return spring, the push seat is in a state away from the filter screen.

[0015] Preferably, the spray pipe is arc-shaped, with the outer side of the arc aligned with the conveying unit. One end of the spray pipe is open and the other end is closed. The open end of the spray pipe is connected to the water storage unit through a second conveying pipe.

[0016] Furthermore, the upper spray unit includes a connecting pipe and a plurality of nozzles disposed on the connecting pipe. The connecting pipe is horizontally disposed inside the box and located above the conveying unit. The connecting pipe is connected to the water storage unit through a first conveying pipe. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention.

[0018] Figure 2 This is a schematic diagram of the lower spray unit.

[0019] Figure 3 This is a structural diagram of the push component.

[0020] In the above attached figures: 1. Box body; 2. Cooling chamber; 3. Conveying channel; 4. Conveying roller; 5. Aluminum rod; 6. Water storage unit; 7. First conveying pipe; 8. Connecting pipe; 9. Nozzle; 10. Spraying pipe; 11. Spray head; 12. Spray hole; 13. Mounting rod; 14. Sliding rod; 15. Cleaning head; 16. Mounting plate; 17. First return spring; 18. Inclined surface; 19. Drive seat; 20. Drive shaft; 21. Second conveying pipe; 22. Drain pipe; 23. Filter screen; 24. Mounting cylinder; 25. Transmission rod; 26. Push seat; 27. Mounting groove; 28. Fixing plate; 29. ​​Second return spring. Detailed Implementation

[0021] The technical solutions of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] like Figure 1-3 As shown in the figure, this embodiment of the invention proposes an aluminum rod cooling system with anti-clogging and self-cleaning functions, including a housing 1, the interior of which is a cooling chamber 2. A horizontal conveying channel 3 is provided on the housing 1, penetrating its opposite side walls. The aluminum rod 5 enters the cooling chamber 2 through the conveying channel 3 and is discharged from the cooling chamber 2 after cooling through the conveying channel 3. The movement of the aluminum rod 5 into and out of the housing 1 is accomplished by an external pushing or traction device (not shown in the figure). For example, a pushing mechanism can be provided on the feeding side of the housing 1 to push the aluminum rod 5 into the cooling chamber 2 along the conveying channel 3, and a traction mechanism can be provided on the discharging side of the housing 1 to pull the cooled aluminum rod 5 out of the cooling chamber 2. The conveying unit provided inside the housing 1 only serves to provide auxiliary support and guide the conveying of the aluminum rod 5, thereby reducing the frictional resistance when the aluminum rod 5 enters and exits the housing 1 and ensuring that the aluminum rod 5 maintains a stable horizontal posture within the cooling chamber 2.

[0023] In this embodiment, the conveying unit includes several conveying rollers 4 rotatably mounted on the inner wall of the housing 1, and a drive motor (not shown in the figure) that drives these conveying rollers 4 to rotate synchronously. The conveying rollers 4 are arranged at intervals along the conveying direction of the aluminum rods 5, forming a horizontal conveying plane. The axes of each conveying roller 4 are parallel to each other and perpendicular to the conveying direction of the aluminum rods 5. Driven by an external pushing device or traction device, the bottom of the aluminum rods 5 contacts the upper surface of the conveying rollers 4. The conveying rollers 4 rotate under the drive of the drive motor, applying an auxiliary frictional force to the aluminum rods 5, thereby assisting the aluminum rods 5 to smoothly enter and leave the cooling chamber 2, and preventing the aluminum rods 5 from sagging or getting stuck due to gravity during long-distance conveying.

[0024] The housing 1 is also equipped with an upper spray unit and a lower spray unit, located on the upper and lower sides of the conveying plane formed by the conveying roller 4, respectively. The upper spray unit is used to spray and cool the upper surface of the aluminum rod 5, while the lower spray unit is used to spray and cool the lower surface of the aluminum rod 5 and the conveying roller 4. A water storage unit 6 is provided outside or inside the housing 1. The water storage unit 6 stores coolant and is equipped with a delivery pump (not shown in the figure) to deliver the coolant to the upper and lower spray units respectively.

[0025] See also Figure 1 The upper spraying unit includes a first conveying pipe 7, a connecting pipe 8, and several nozzles 9. The connecting pipe 8 is horizontally arranged inside the housing 1 and located above the conveying roller 4, with its length parallel to the axial direction of the conveying roller 4. One end of the connecting pipe 8 is closed, and the other end is connected to the water storage unit 6 through the first conveying pipe 7. Several nozzles 9 are evenly installed on the side wall of the connecting pipe 8 near the conveying roller 4, with each nozzle 9 spraying towards the aluminum rod 5 on the conveying roller 4. During operation, the pump in the water storage unit 6 sends coolant into the connecting pipe 8 through the first conveying pipe 7, and then sprays it downwards from each nozzle 9 to cool the upper surface of the aluminum rod 5.

[0026] like Figure 1 and Figure 2 As shown, the lower spray unit includes a spray pipe 10, a nozzle 11, a cleaning assembly, and a power transmission assembly. The spray pipe 10 is disposed inside the cooling chamber 2, below the conveyor roller 4. In this embodiment, the spray pipe 10 is arc-shaped, with its outer arc facing the conveyor roller 4. One end of the spray pipe 10 is an open end, and the other end is a closed end. Its open end is connected to the water storage unit 6 through the second conveying pipe 21. During operation, the conveying pump in the water storage unit 6 delivers coolant into the spray pipe 10 through the second conveying pipe 21.

[0027] Several nozzles 11 are installed on the outer arc-shaped outer wall of the spray pipe 10, and the nozzles 11 are spaced apart along the arc direction of the spray pipe 10. Each nozzle 11 has at least one spray hole 12 for spraying the coolant in the spray pipe 10 outward to the lower surface of the aluminum rod 5. Each nozzle 11 is equipped with a set of cleaning components, and the number of cleaning components is equal to the number of nozzles 11.

[0028] like Figure 2As shown, the cleaning assembly includes a sliding rod 14, a mounting rod 13, and a cleaning head 15. The mounting rod 13 is located inside the nozzle 11, and its shape is adapted to the internal space of the nozzle 11. A cleaning head 15 is fixedly disposed on the side of the mounting rod 13 facing the nozzle 12. The number of cleaning heads 15 corresponds one-to-one with the number of nozzles 12, and each cleaning head 15 is coaxially aligned with its corresponding nozzle 12. In this embodiment, the cleaning head 15 is preferably a conical structure with its tip facing the nozzle 12, which facilitates insertion into the nozzle 12 to scrape off impurities adhering to its inner wall.

[0029] One end of the sliding rod 14 is fixed to the side of the mounting rod 13 away from the spray hole 12 (i.e., the side of the mounting rod 13 facing the inside of the spray pipe 10), and the other end of the sliding rod 14 extends through the inner wall of the spray pipe 10 to the outside of the spray pipe 10. The sliding rod 14 and the pipe wall of the spray pipe 10 are connected by a dynamic seal. Specifically, a through hole is opened on the pipe wall of the spray pipe 10 for the sliding rod 14 to pass through. A sealing ring or a packing sealing assembly is embedded in the through hole. The sliding rod 14 passes through the through hole and can slide freely along its own axis. At the same time, the inner wall of the sealing ring or packing sealing assembly is tightly fitted with the outer wall of the sliding rod 14, thereby ensuring the reciprocating movement of the sliding rod 14 relative to the spray pipe 10 while preventing the coolant in the spray pipe 10 from leaking from the through hole.

[0030] like Figure 2 As shown, a mounting plate 16 is fixedly installed at one end of the sliding rod 14 outside the spray pipe 10 (i.e., the end of the sliding rod 14 facing the power transmission assembly). A first return spring 17 is provided between the mounting plate 16 and the outer wall of the spray pipe 10. The first return spring 17 is sleeved on the sliding rod 14, with one end abutting against the side of the mounting plate 16 facing the spray pipe 10, and the other end abutting against the outer wall of the spray pipe 10. Under the elastic force of the first return spring 17, the mounting plate 16 is pushed outward away from the spray pipe 10, thereby causing the sliding rod 14 and the mounting rod 13 to move away from the spray hole 12 as a whole, so that the cleaning head 15 remains in its initial state away from the spray hole 12, avoiding interference with the normal spraying of the spray hole 12 in the non-cleaning state.

[0031] A power transmission assembly, used to drive the hole-cleaning assembly, is disposed within the cooling chamber 2. In this embodiment, the power transmission assembly includes a drive base 19 and a drive shaft 20. The drive shaft 20 is rotatably disposed within the cooling chamber 2, its axial direction being parallel to the axial direction of the conveying roller 4. The drive base 19 is fixedly mounted on the drive shaft 20. A servo motor (not shown in the figure) is mounted on the outer wall of the housing 1, and the output shaft of the servo motor is connected to one end of the drive shaft 20 for driving the drive shaft 20 and the drive base 19 to rotate.

[0032] like Figure 2As shown, one end of the sliding rod 14 extending outside the spray pipe 10 is provided with an inclined surface 18, which is located on the side wall of the sliding rod 14 facing the drive seat 19. When the servo motor drives the drive shaft 20 to rotate, the drive seat 19 rotates accordingly. The distal end of its elliptical outer wall contacts the inclined surface 18 at the end of each sliding rod 14 in sequence and applies a pushing force, pushing the sliding rod 14 to overcome the elastic force of the first return spring 17 and move towards the nozzle 11, so that the cleaning head 15 is inserted into the spray hole 12 to clean the impurities adhering to the inner wall of the spray hole 12. When the distal end of the drive seat 19 rotates past the position of the sliding rod 14, under the elastic force of the first return spring 17, the sliding rod 14 returns to its original position in the opposite direction, the cleaning head 15 exits the spray hole 12, and the normal spraying state is restored. By controlling the drive seat 19 to rotate continuously or intermittently by the servo motor, the periodic automatic cleaning of all spray holes 12 can be achieved.

[0033] like Figure 1 and Figure 3 As shown, a drain outlet is provided at the bottom of the housing 1, and a drain pipe 22 is connected to the drain outlet to drain the coolant accumulated in the cooling chamber 2. A filter screen 23 is installed at the drain outlet to filter impurities in the coolant, enabling the coolant to be recycled or purified for discharge. The top surface of the filter screen 23 is flush with the inner surface of the bottom wall of the cooling chamber 2, so that when impurities are deposited on the top of the filter screen 23 under gravity, they can be easily pushed away by the pushing component.

[0034] A pushing component is provided on one side of the filter screen 23 to push impurities accumulated on the top of the filter screen 23 away from the filtration area, preventing the filter screen 23 from clogging. The pushing component includes a mounting cylinder 24, a transmission rod 25, and a pushing seat 26. The mounting cylinder 24 is fixedly mounted on the inner wall of the cooling chamber 2, and both ends of the mounting cylinder 24 are sealed by sealing caps, forming a mounting groove 27 inside. The transmission rod 25 is slidably disposed in the mounting groove 27, with one end of the transmission rod 25 horizontally passing through one of the sealing caps and extending to the outside of the mounting cylinder 24. The transmission rod 25 and the sealing cap are also connected by a dynamic seal (e.g., an embedded sealing ring) to prevent coolant in the cooling chamber 2 from entering the mounting groove 27. A fixing plate 28 is fixedly provided on the portion of the transmission rod 25 located in the mounting groove 27, and a second return spring 29 is provided between the fixing plate 28 and the inner wall of the mounting groove 27. Under the elastic force of the second return spring 29, the transmission rod 25 is pushed out of the mounting cylinder 24.

[0035] One end of the transmission rod 25 extending out of the mounting cylinder 24 is fixedly connected to a vertically arranged pusher seat 26, the bottom of which is in close contact with the bottom wall of the cooling chamber 2. The pusher seat 26 is located on one side of the filter screen 23, and its side wall is also provided with an inclined surface, the orientation of which is adapted to the rotation direction of the drive seat 19. When the drive seat 19 rotates to contact the inclined surface, the elliptical outer wall of the drive seat 19 pushes the pusher seat 26 to slide towards the filter screen 23. The bottom of the pusher seat 26 scrapes the impurities accumulated on the top of the filter screen 23 away from the filtration area, thereby clearing the filter screen 23. After the drive seat 19 continues to rotate past this position, under the elastic force of the second return spring 29, the pusher seat 26 automatically returns to its initial position away from the filter screen 23. Thus, while driving the cleaning assembly to clean the nozzle 12, the drive seat 19 can also simultaneously drive the pusher assembly to clean the filter screen 23, achieving a multi-purpose effect and further improving the automation level and anti-clogging performance of the system.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An aluminum rod cooling system with anti-clogging and self-cleaning function, comprising: A housing (1) has a cooling chamber (2) inside. A horizontal conveying channel (3) is provided on the housing (1) and extends through it. A conveying unit for conveying aluminum rods (5) is provided inside the housing (1). An upper spraying unit and a lower spraying unit are also provided inside the housing (1), located on the upper and lower sides of the conveying unit, respectively. The lower spraying unit comprises: A spray pipe (10) is installed in the cooling chamber (2). The spray pipe (10) is connected to a water storage unit (6) located on one side of the box (1). The outer wall of the spray pipe (10) is provided with a plurality of nozzles (11), and each nozzle (11) is provided with at least one spray hole (12). A cleaning hole assembly is provided on the spray pipe (10) and corresponds to the number of the nozzles (11). One end of the cleaning hole assembly is aligned with the spray hole (12), and the other end extends out of the spray pipe (10). The cleaning hole assembly is dynamically sealed to the spray pipe (10). A power transmission assembly is disposed inside the housing (1) and is used to drive the cleaning assembly to clean the nozzle (12) on the corresponding nozzle (11).

2. The aluminum rod cooling system with anti-clogging and self-cleaning function according to claim 1, characterized in that, The conveying unit includes several conveying rollers (4) rotatably disposed inside the housing (1) and a drive motor for driving the conveying rollers (4) to rotate. The drive motor is disposed on the back of the housing (1).

3. The aluminum rod cooling system with anti-clogging and self-cleaning function according to claim 1, characterized in that, The cleaning assembly includes a sliding rod (14), a mounting rod (13), and a cleaning head (15). The mounting rod (13) is located inside the nozzle (11). The cleaning head (15) is located on the side of the mounting rod (13) facing the nozzle (12). One end of the sliding rod (14) is fixed to the side of the mounting rod (13) away from the nozzle (12). The other end of the sliding rod (14) extends through the inner wall of the spray pipe (10). The sliding rod (14) is dynamically sealed to the spray pipe (10).

4. The aluminum rod cooling system with anti-clogging and self-cleaning function according to claim 3, characterized in that, The sliding rod (14) is fixedly provided with a mounting plate (16) at one end outside the spray pipe (10). A first reset spring (17) is provided between the mounting plate (16) and the inner wall of the spray pipe (10). Under the elastic force of the first reset spring (17), the cleaning head (15) remains away from the spray hole (12).

5. The aluminum rod cooling system with anti-clogging and self-cleaning function according to claim 4, characterized in that, The power transmission assembly includes a drive seat (19) and a drive shaft (20). The drive seat (19) is rotatably disposed in the cooling chamber (2) via the drive shaft (20). The outer wall of the drive seat (19) is an elliptical cylindrical surface. The outer wall of the housing (1) is provided with a servo motor that drives the drive shaft (20) to rotate. The side wall of the end of the sliding rod (14) that extends out of the spray pipe (10) is provided with an inclined surface (18). The drive seat (19) is used to push the inclined surface (18) to make the sliding rod (14) move toward the nozzle (11).

6. The aluminum rod cooling system with anti-clogging and self-cleaning function according to claim 5, characterized in that, The bottom of the box (1) is provided with a drain outlet, a drain pipe (22) is connected to the drain outlet, a filter screen (23) is provided at the drain outlet, and a pushing component is provided on one side of the filter screen (23). The pushing component is used to push the impurities accumulated on the top of the filter screen (23).

7. The aluminum rod cooling system with anti-clogging and self-cleaning function according to claim 6, characterized in that, The pushing assembly includes: an installation cylinder (24) fixed to the inner wall of the cooling cavity (2), the inside of the installation cylinder (24) is an installation groove (27), a transmission rod (25) is slidably arranged in the installation groove (27), one end of the transmission rod (25) extends horizontally out of the installation cylinder (24), and a vertical pushing seat (26) is provided at the end of the transmission rod (25) extending out of the installation cylinder (24). The bottom of the pushing seat (26) is in close contact with the bottom of the cooling cavity (2), the top of the filter screen (23) is on the same horizontal plane as the bottom of the cooling cavity (2), the pushing seat (26) is located on one side of the filter screen (23), and the side wall of the pushing seat (26) is also provided with an inclined surface. The driving seat (19) is used to cooperate with the inclined surface to drive the pushing seat (26) to slide in the cooling cavity (2).

8. The aluminum rod cooling system with anti-clogging and self-cleaning function according to claim 7, characterized in that, A fixed plate (28) is provided on the transmission rod (25). The fixed plate (28) is located in the mounting groove (27). A second return spring (29) is provided between the side wall of the fixed plate (28) away from the push seat (26) and the inner wall of the mounting groove (27). Under the elastic force of the second return spring (29), the push seat (26) is in a state away from the filter screen (23).

9. The aluminum rod cooling system with anti-clogging and self-cleaning function according to claim 1, characterized in that, The spray pipe (10) is arc-shaped, with the outer side of the arc of the spray pipe (10) aligned with the conveying unit. One end of the spray pipe (10) is open and the other end is closed. The open end of the spray pipe (10) is connected to the water storage unit (6) through the second conveying pipe (21).

10. The aluminum rod cooling system with anti-clogging and self-cleaning function according to claim 1, characterized in that, The upper spray unit includes a connecting pipe (8) and a plurality of nozzles (9) disposed on the connecting pipe (8). The connecting pipe (8) is horizontally disposed inside the housing (1) and located above the conveying unit. The connecting pipe (8) is connected to the water storage unit (6) through the first conveying pipe (7).

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