Underground cold local cooling device

Abstract

The utility model provides an underground cold local cooling device. According to the device, a cold storage device is arranged in an outer box device, a heat exchange assembly is arranged in the cold storage device, a water pumping device is arranged in the cold storage device, and an air inlet is formed in the outer box device; an air inlet interlayer formed by the inner wall of the outer box device and the outer wall of the cold storage device is communicated with the air inlet device; the heat exchange assembly comprises a first snakelike heat exchange pipe connected with the cold storage device and a second snakelike heat exchange pipe arranged in the first snakelike heat exchange pipe. In this way, hot air in the external environment enters the air inlet interlayer through the air inlet device to be primarily cooled and then enters the first S-shaped heat exchange pipe to be cooled again, and cold water flowing through the second S-shaped heat exchange pipe arranged in the first S-shaped heat exchange pipe can further cool the hot air; in addition, the flowing path of the air flow is long, the heat exchange area is large when the air flow exchanges heat with the air inlet interlayer and the first S-shaped heat exchange pipe in sequence, and therefore the cooling efficiency of the hot air can be greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of underground ventilation and cooling, in particular to an underground ice-cooling local cooling device. Background Art

[0002] With the continuous increase of the mining depth of mines and the continuous improvement of the mechanization degree, heat sources such as geothermal temperature, mechanical heat dissipation and air compression heat cause the temperature of the mine working face to rise continuously, resulting in the operators working in a high-temperature environment, which seriously affects the physical and mental health and working efficiency of the operators. The ice-cooling method can be adopted underground to improve the local environment around the operators. However, most of the current cooling devices are large in volume, low in heat exchange efficiency and large in cold loss, resulting in large ice consumption, poor refrigeration effect and short refrigeration time. Therefore, it is necessary to optimize the heat exchange efficiency and refrigeration effect of the ice-cooling device to improve the heat exchange efficiency and refrigeration time of the cooling device.

[0003] In view of this, it is necessary to design an underground ice-cooling local cooling device to solve the above problems. Summary of the Utility Model

[0004] Aiming at the defects of the above-mentioned prior art, the purpose of the utility model is to provide an underground ice-cooling local cooling device. By arranging a first serpentine heat exchange tube in the cavity of the cold storage device, the flow path of the air flow is longer; and by arranging a plurality of second serpentine heat exchange tubes in the first serpentine heat exchange tube, the contact area between the cold water and the first serpentine heat exchange tube is larger, so as to achieve the purpose of faster cooling.

[0005] To achieve the above purpose, the utility model provides an underground ice-cooling local cooling device, including: an outer box device, a cold storage device arranged in the cavity of the outer box device, an air inlet interlayer formed by the inner wall of the outer box device and the outer wall of the cold storage device, a heat exchange component arranged in the cavity of the cold storage device, and an air inlet arranged on the outer box device; the air inlet is communicated with the air inlet interlayer;

[0006] The heat exchange component includes a first serpentine heat exchange tube connected to the cold storage device and a plurality of second serpentine heat exchange tubes arranged in the cavity of the first serpentine heat exchange tube; the inlet end of the first serpentine heat exchange tube is connected to the cold storage device, the inlet end of the first serpentine heat exchange tube is communicated with the air inlet interlayer, and the outlet end of the first serpentine heat exchange tube sequentially penetrates through the cold storage device and the outer box device; the second serpentine heat exchange tube is communicated with the cold storage device.

[0007] Further, the underground ice-cooling local cooling device further includes: a water pumping device arranged in the cavity of the cold storage device, a moving device arranged at the bottom end of the outer box device, and a partition net arranged in the cavity of the cold storage device and above the heat exchange component.

[0008] Further, the outer box device includes a box body for accommodating the cold storage device and an outer cover provided at the top end of the box body; a channel is formed between the outer wall and the inner wall of the outer box device; heat insulation cotton is installed in the channel.

[0009] Further, the cold storage device includes a cold storage box and a cold storage box cover provided at the top end of the cold storage box.

[0010] Further, an air duct device is connected to the outlet end of the first serpentine heat exchange tube.

[0011] Further, the water inlet of the second serpentine heat exchange tube communicates with the top end of the first serpentine heat exchange tube, and the water outlet of the second serpentine heat exchange tube communicates with the bottom end of the first serpentine heat exchange tube.

[0012] Further, the air duct device includes a bendable air duct connected to the outlet end of the first serpentine heat exchange tube; the outlet end of the first serpentine heat exchange tube is connected to the bendable air duct through a connecting body.

[0013] Further, the water pumping device includes a circulation pump provided at the bottom end of the cold storage box and a water suction pipe with its bottom end connected to the circulation pump.

[0014] Further, the inner wall at the bottom end of the outer box device and the outer wall at the bottom end of the cold storage device are connected through a support member; the support member includes a gasket.

[0015] Further, the top end of the water suction pipe is located above the partition net.

[0016] The beneficial effects of the present utility model are:

[0017] 1. The underground ice-cooled local cooling device provided by the present utility model includes a cold storage device disposed in an outer box device, a heat exchange assembly disposed in the cold storage device, and an air inlet disposed on the outer box device. Among them, the air inlet interlayer formed by the inner wall of the outer box device and the outer wall of the cold storage device is communicated with the air inlet. The heat exchange assembly includes a first serpentine heat exchange tube connected to the cold storage device and a plurality of second serpentine heat exchange tubes disposed in the cavity of the first serpentine heat exchange tube. The inlet end of the first serpentine heat exchange tube is connected to the cold storage device and then communicated with the air inlet interlayer. The outlet end of the first serpentine heat exchange tube sequentially penetrates through the cold storage device and the outer box device. The second serpentine heat exchange tube is communicated with the cold storage device. In this way, the hot air in the external environment enters the air inlet interlayer through the air inlet for preliminary cooling, and then enters the first serpentine heat exchange tube for further cooling. The cold water flowing through the second serpentine heat exchange tube disposed in the first serpentine heat exchange tube will further cool the hot air. In addition, the flow path of the air flow is long, and the heat exchange area is large when the air flow exchanges heat with the air inlet interlayer and the first serpentine heat exchange tube in sequence. Therefore, the cooling efficiency of the hot air can be greatly improved.

[0018] 2. The underground ice-cooled local cooling device provided by the present utility model includes a water pumping device disposed in the cavity of the cold storage device and a partition net disposed in the cavity of the cold storage device and above the heat exchange assembly. The water pumping device includes a circulation pump disposed at the bottom end of the cold storage tank and a water suction pipe with the bottom end connected to the circulation pump. The top end of the water suction pipe is located above the partition net. During the operation process, ice cubes are placed on the partition net and are covered by the water in the cold storage tank. In this way, after the cold water in the second serpentine heat exchange tube absorbs the heat of the air flow, the water temperature rises and flows to the bottom end of the cold storage tank. At this time, the circulation pump pumps the water at the bottom end to the top end of the cold storage tank. At this time, the hot water at the bottom end exchanges heat with the ice water at the top end and is cooled in time. At the same time, under the pressure of the water pump, it can also prevent the pipeline from being blocked due to dust accumulation in the second serpentine heat exchange tube. Furthermore, the partition net is disposed above the first serpentine heat exchange tube with a certain distance. In this way, the ice cubes are placed on the partition net, so that the ice cubes are separated from the first serpentine heat exchange tube by a certain distance. In this way, it is avoided that the ice cubes are in direct contact with the serpentine heat exchange tube, which causes the melting speed of the ice cubes to be too fast and leads to the shortening of the cooling endurance time of the entire cooling device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is the front sectional view of the underground ice-cooled local cooling device provided by the present utility model;

[0020] Figure 2 It is the top sectional view of the underground ice-cooled local cooling device provided by the present utility model;

[0021] Figure 3 It is the side sectional view of the underground ice-cooled local cooling device provided by the present utility model;

[0022] Figure 4Partial three-dimensional structural schematic diagram of the downhole ice-cooling local cooling device provided by the present utility model.

[0023] Reference numerals

[0024] 11 - Box body; 12 - Outer cover; 13 - Channel; 21 - Cold storage box; 22 - Cold storage box cover; 23 - Support member; 3 - Heat exchange assembly; 31 - First serpentine heat exchange tube; 32 - Second serpentine heat exchange tube; 41 - Circulation pump; 42 - Suction pipe; 51 - Air inlet; 52 - Fan; 6 - Moving device; 7 - Air inlet interlayer; 81 - Flexible air duct; 82 - Connector; 9 - Partition net; 10 - Water; 101 - Ice cubes. Specific embodiments

[0025] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Here, it should also be noted that in order to avoid obscuring the present utility model due to unnecessary details, only the structures and / or processing steps closely related to the solution of the present utility model are shown in the drawings, while other details less related to the present utility model are omitted. Additionally, it should be noted that the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0027] As Figures 1 to 4 shown, a downhole ice-cooling local cooling device provided by the present utility model includes: an outer box device, a cold storage device disposed in the cavity of the outer box device, an air inlet interlayer 7 formed by the inner wall of the outer box device and the outer wall of the cold storage device, a heat exchange assembly 3 disposed in the cavity of the cold storage device, and an air inlet 51 disposed on the outer box device; the air inlet 51 is communicated with the air inlet interlayer 7;

[0028] The heat exchange component 3 includes a first serpentine heat exchange tube 31 connected to the cold storage device, and a plurality of second serpentine heat exchange tubes 32 arranged in the cavity of the first serpentine heat exchange tube 31; the inlet end of the first serpentine heat exchange tube 31 is connected to the cold storage device, the inlet end of the first serpentine heat exchange tube 31 is communicated with the air inlet sandwich layer 7, and the outlet end of the first serpentine heat exchange tube 31 sequentially penetrates through the cold storage device and the outer box device; the second serpentine heat exchange tube 32 is communicated with the cold storage device. The water inlet of the second serpentine heat exchange tube 32 is communicated with the top end of the first serpentine heat exchange tube 31, and the water outlet of the second serpentine heat exchange tube 32 is communicated with the bottom end of the first serpentine heat exchange tube 31. The protruding parts of the bent sections in the first serpentine heat exchange tube 31 respectively face the front wall and the rear wall of the cold storage box 21, and the extending direction of the bent section in the first serpentine heat exchange tube 31 is parallel to the extending direction of the front wall of the cold storage box 21; the extending direction of the bent section in the second serpentine heat exchange tube 32 is perpendicular to the extending direction of the front wall of the cold storage box 21.

[0029] The cold storage device includes a cold storage box 21 and a cold storage box cover 22 arranged at the top end of the cold storage box 21.

[0030] The inner wall of the bottom end of the outer box device and the outer wall of the bottom end of the cold storage device are connected by a support member 23; the support member 23 includes a gasket.

[0031] With such a setting, the hot air in the external environment enters the air inlet sandwich layer 7 through the air inlet device for preliminary cooling, and then enters the first serpentine heat exchange tube 31 for further cooling. The water 10 flowing through the second serpentine heat exchange tube 32 arranged in the first serpentine heat exchange tube 31 will further cool the hot air; in addition, the flow path of the air flow is long, and the heat exchange area is large when the air flow exchanges heat with the air inlet sandwich layer 7 and the first serpentine heat exchange tube 31 in sequence. Therefore, the cooling efficiency of the hot air can be greatly improved.

[0032] Specifically, in some embodiments of the present invention, the underground ice-cooled local cooling device further includes: a water pumping device arranged in the cavity of the cold storage device, a moving device 6 arranged at the bottom end of the outer box device, and a partition net 9 arranged in the cavity of the cold storage device and above the heat exchange component 3.

[0033] The water pumping device includes a circulation pump 41 arranged at the bottom end of the cold storage box 21 and a water suction pipe 42 with the bottom end connected to the circulation pump 41. The top end of the water suction pipe 42 is located above the partition net 9. Ice cubes 101 are placed on the partition net 9; the ice cubes 101 are covered by the water 10 in the cold storage box 21.

[0034] With such a setting, after the water 10 in the second serpentine heat exchange tube 32 absorbs the heat of the air flow, the water temperature rises and flows to the bottom end of the cold storage tank 21. At this time, the circulation pump 41 pumps the water 10 at the bottom end to the top end of the cold storage tank 21. At this time, the hot water at the bottom end exchanges heat with the ice water at the top end, and timely cooling treatment is obtained. At the same time, under the pressure of the circulation pump 41, it is also possible to prevent the pipeline in the second serpentine heat exchange tube 32 from being blocked due to ash accumulation. Furthermore, the partition net 9 is arranged above the first serpentine heat exchange tube 31 with a certain distance. In this way, the ice block 101 is placed on the partition net 9, so that the ice block 101 is separated from the first serpentine heat exchange tube 31 by a certain distance. In this way, it is possible to prevent the ice block from directly contacting the serpentine heat exchange tube 31, resulting in too fast melting speed of the ice block and shortening the cooling endurance time of the entire cooling device.

[0035] Specifically, in some embodiments of the present invention, the outer box device includes a box body 11 for accommodating the cold storage device, and an outer cover 12 provided at the top end of the box body 11. The outer cover 12 is used to seal the box body 11; a channel 13 is formed between the outer wall and the inner wall of the outer box device; heat insulation cotton is installed in the channel 13 (heat insulation cotton is provided in the channels 13 of both the box body 11 and the outer cover 12).

[0036] With such a setting, the heat exchange between the incoming air flow, the cold storage tank 21 and the external high-temperature environment can be reduced, and at the same time, the function of preventing impact deformation can be achieved.

[0037] Specifically, in some embodiments of the present invention, the outlet end of the first serpentine heat exchange tube 31 is connected to an air duct device; the air duct device includes a bendable air duct 81 connected to the outlet end of the first serpentine heat exchange tube 31; the outlet end of the first serpentine heat exchange tube 31 is connected to the bendable air duct 81 through a connecting body 82.

[0038] With such a setting, the air supply distance can be lengthened, the air supply direction can be flexibly adjusted, and the cold loss of the air supply can be reduced.

[0039] Specifically, in some embodiments of the present invention, the moving device 6 includes universal wheels.

[0040] With such a setting, it is convenient for the underground ice-cold local cooling device to move.

[0041] The following specifically describes the underground ice-cold local cooling device provided by the present invention in conjunction with embodiments.

[0042] Embodiment

[0043] Such as Figures 1 to 4As shown in the figure, this embodiment provides an underground ice-cooling local cooling device, including: an outer box device, a cold storage device arranged in the cavity of the outer box device, an air inlet sandwich layer 7 formed by the inner wall of the outer box device and the outer wall of the cold storage device, a heat exchange component 3 arranged in the cavity of the cold storage device, a water pumping device arranged in the cavity of the cold storage device, an air inlet 51 arranged on the outer box device, a moving device 6 arranged at the bottom end of the outer box device, and a partition net 9 arranged in the cavity of the cold storage device and above the heat exchange component 3; the air inlet 51 is communicated with the air inlet sandwich layer 7; a fan 52 is arranged in the air inlet 51;

[0044] The outer box device includes a box body 11 for accommodating the cold storage device and an outer cover 12 arranged at the top end of the box body 11, and the outer cover 12 is used for sealing the box body 11; a channel 13 is formed between the outer wall and the inner wall of the outer box device; heat insulation cotton is installed in the channel 13 (heat insulation cotton is arranged in the channels 13 of both the box body 11 and the outer cover 12).

[0045] The cold storage device includes a cold storage box 21 and a cold storage box cover 22 arranged at the top end of the cold storage box 21.

[0046] The inner wall at the bottom end of the outer box device and the outer wall at the bottom end of the cold storage device are connected through a support member 23; the support member 23 includes a gasket.

[0047] The heat exchange component 3 includes a first serpentine heat exchange tube 31 connected to the cold storage device and a plurality of second serpentine heat exchange tubes 32 uniformly arranged in the cavity of the first serpentine heat exchange tube 31; the inlet end of the first serpentine heat exchange tube 31 is connected to the rear wall of the cold storage device (the cold storage box 21), and the outlet end of the first serpentine heat exchange tube 31 sequentially penetrates through the front wall of the cold storage device (the cold storage box 21) and the front wall of the outer box device (the box body 11). The second serpentine heat exchange tube 32 is communicated with the cold storage device. The inlet end of the first serpentine heat exchange tube 31 is communicated with the air inlet sandwich layer 7, the water inlet of the second serpentine heat exchange tube 32 is communicated with the top end of the first serpentine heat exchange tube 31, and the water outlet of the second serpentine heat exchange tube 32 is communicated with the bottom end of the first serpentine heat exchange tube 31. The protruding parts of the bent sections in the first serpentine heat exchange tube 31 respectively face the front wall and the rear wall of the cold storage box 21, and the extending direction of the bent section in the first serpentine heat exchange tube 31 is parallel to the extending direction of the front wall of the cold storage box 21 shown; the extending direction of the bent section in the second serpentine heat exchange tube 32 is perpendicular to the extending direction of the front wall of the cold storage box 21 shown.

[0048] The pumping device includes a circulation pump 41 provided at the bottom end of the cold storage tank 21, and a water suction pipe 42 with its bottom end connected to the circulation pump 41. The top end of the water suction pipe 42 is located above the partition net 9. Ice cubes 101 are placed on the partition net 9; the ice cubes 101 are covered by the water 10 in the cold storage tank 21.

[0049] The outlet end of the first serpentine heat exchange tube 31 is connected to an air duct device. The air duct device includes a bendable air duct 81 connected to the outlet end of the first serpentine heat exchange tube 31; the outlet end of the first serpentine heat exchange tube 31 and the bendable air duct 81 are connected through a connecting body 82.

[0050] The moving device 6 includes universal wheels.

[0051] The top end of the water suction pipe 42 is located above the partition net 9.

[0052] The working process of an underground ice-cooled local cooling device provided by the present utility model will be described below:

[0053] As Figures 1 to 4 shown, the hot air in the external environment enters the air inlet sandwich layer 7 through the fan 52 for preliminary cooling, and then enters the first serpentine heat exchange tube 31 for further cooling; the low-temperature water 10 flowing through the second serpentine heat exchange tube 32 provided in the first serpentine heat exchange tube 31 (the low-temperature water 10 comes from the cooling of the water 10 by the ice cubes 101 on the partition net 9) will further cool the hot air. In addition, after the water 10 in the second serpentine heat exchange tube 32 absorbs the heat of the air flow, the water temperature rises and flows to the bottom end of the cold storage tank 21. At this time, the circulation pump 41 pumps the water 10 at the bottom end to the top end of the cold storage tank 21. At this time, the hot water at the bottom end exchanges heat with the ice water at the top end and is cooled in time; at the same time, under the pressure of the circulation pump 41, it is also possible to prevent the pipeline in the second serpentine heat exchange tube 32 from being blocked due to ash accumulation. Moreover, the air flow passes through a long path, and the heat exchange area is large when the air flow exchanges heat with the air inlet sandwich layer 7 and the first serpentine heat exchange tube 31 in turn. In this way, the cooling efficiency of the hot air is greatly improved.

[0054] In summary, the present utility model provides an underground ice-cooling local cooling device, which is provided with a cold storage device in an outer box device, a heat exchange component in the cold storage device, and an air inlet on the outer box device; wherein an air inlet sandwich formed by the inner wall of the outer box device and the outer wall of the cold storage device is communicated with the air inlet; the heat exchange component includes a first serpentine heat exchange tube connected to the cold storage device, and a plurality of second serpentine heat exchange tubes arranged in the cavity of the first serpentine heat exchange tube. The inlet end of the first serpentine heat exchange tube is connected to the cold storage device and then communicated with the air inlet sandwich. The outlet end of the first serpentine heat exchange tube sequentially penetrates through the cold storage device and the outer box device, and the second serpentine heat exchange tube is communicated with the cold storage device; thus, the hot air in the external environment enters the air inlet sandwich through the air inlet for preliminary cooling, and then enters the first serpentine heat exchange tube for further cooling. The cold water flowing through the second serpentine heat exchange tube arranged in the first serpentine heat exchange tube will further cool the hot air; in addition, the flow path of the air flow is long, and the heat exchange area is large when the air flow exchanges heat with the air inlet sandwich and the first serpentine heat exchange tube in sequence. Therefore, the cooling efficiency of the hot air can be greatly improved. By arranging a water pumping device in the cavity of the cold storage device and a partition net above the heat exchange component in the cavity of the cold storage device, wherein the water pumping device includes a circulation pump arranged at the bottom end of the cold storage tank and a water suction pipe with the bottom end connected to the circulation pump, and the top end of the water suction pipe is located above the partition net; during the operation process, ice cubes are placed on the partition net and the ice cubes are covered by the water in the cold storage tank; thus, after the cold water in the second serpentine heat exchange tube absorbs the heat of the air flow, the water temperature rises and flows to the bottom end of the cold storage tank. At this time, the circulation pump pumps the water at the bottom end to the top end of the cold storage tank. At this time, the hot water at the bottom end exchanges heat with the ice water at the top end and is cooled in time; at the same time, under the pressure of the water pump, it can also prevent the pipeline from being blocked due to ash accumulation in the second serpentine heat exchange tube; furthermore, the partition net is arranged above the first serpentine heat exchange tube with a certain distance, so that the ice cubes are placed on the partition net, and the ice cubes are separated from the first serpentine heat exchange tube by a certain distance, so as to avoid the ice cubes directly contacting the serpentine heat exchange tube and causing the melting speed of the ice cubes to be too fast, resulting in the shortening of the cooling endurance time of the entire cooling device.

[0055] The above embodiments are only used to illustrate the technical solutions of the present utility model and not to limit them. Although the present utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present utility model can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present utility model.

Claims

1. An underground ice-cooling local cooling device, characterized in that: include: An outer box device, a cold storage device arranged in the cavity of the outer box device, an air inlet interlayer formed by the inner wall of the outer box device and the outer wall of the cold storage device, a heat exchange component arranged in the cavity of the cold storage device, and an air inlet arranged on the outer box device; the air inlet is connected to the air inlet interlayer; The heat exchange assembly includes a first serpentine heat exchange tube connected to the cold storage device and a plurality of second serpentine heat exchange tubes arranged in the cavity of the first serpentine heat exchange tube; the inlet end of the first serpentine heat exchange tube is connected to the cold storage device, the inlet end of the first serpentine heat exchange tube is communicated with the air inlet interlayer, and the outlet end of the first serpentine heat exchange tube sequentially passes through the cold storage device and the outer box device; the second serpentine heat exchange tube is communicated with the cold storage device.

2. The underground ice-cooling local cooling device according to claim 1 is characterized in that: Also includes: A water pumping device is arranged in the cavity of the cold storage device, a moving device is arranged at the bottom end of the outer box device, and a partition net is arranged in the cavity of the cold storage device and located above the heat exchange component.

3. The underground ice-cooling local cooling device according to claim 1 is characterized in that: The outer box device comprises a box body for accommodating the cold storage device and an outer cover arranged at the top of the box body; a channel is formed between the outer wall and the inner wall of the outer box device; and heat insulation cotton is installed in the channel.

4. The underground ice-cooling local cooling device according to claim 2 is characterized in that: The cold storage device comprises a cold storage box and a cold storage box cover arranged on the top of the cold storage box.

5. The underground ice-cooling local cooling device according to claim 1 is characterized in that: The outlet end of the first serpentine heat exchange tube is connected with an air duct device.

6. The underground ice-cooling local cooling device according to claim 1 is characterized in that: The water inlet of the second serpentine heat exchange tube is communicated with the top end of the first serpentine heat exchange tube, and the water outlet of the second serpentine heat exchange tube is communicated with the bottom end of the first serpentine heat exchange tube.

7. The underground ice-cooling local cooling device according to claim 5 is characterized in that: The air duct device includes a bendable air duct connected to the outlet end of the first serpentine heat exchange tube; the outlet end of the first serpentine heat exchange tube is connected to the bendable air duct via a connector.

8. The underground ice-cooling local cooling device according to claim 4 is characterized in that: The pumping device comprises a circulation pump arranged at the bottom end of the cold storage box and a pumping pipe connected to the circulation pump at the bottom end.

9. The underground ice-cooling local cooling device according to claim 1 is characterized in that: The inner wall of the bottom end of the outer box device and the outer wall of the bottom end of the cold storage device are connected through a supporting member; the supporting member includes a gasket.

10. The underground ice-cooling local cooling device according to claim 8, characterized in that: The top end of the water pumping pipe is located above the partition net.

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