Ice making device facilitating ice unloading and ice making machine

Abstract

The utility model relates to the technical field of ice-making machines, in particular to an ice-making device convenient to deice and an ice-making machine, the ice-making device convenient to deice comprises an evaporator upper mold assembly, and a plurality of upper hemispherical ice grids are arranged on the evaporator upper mold assembly; a plurality of lower hemispherical ice grids are arranged on the lower mold assembly, the lower mold assembly is rotatably connected to the upper mold assembly through a rotating assembly, and the lower hemispherical ice grids and the upper hemispherical ice grids are tightly attached to form spherical ice making grids; and a heat exchange device is correspondingly arranged on the outer side of the lower hemispherical ice grid. By means of the arrangement, the deicing effect of the spherical ice blocks is achieved in a heat exchange ice melting mode, the spherical ice blocks cannot be damaged, the ice making efficiency of the whole machine is improved, the yield of the spherical ice blocks is increased, the structure is simpler, and the cost is lower.

Description

Technical Field

[0001] The utility model relates to the technical field of ice makers, in particular to an ice making device and an ice maker that are convenient for ice removal. Background Art

[0002] There are already ice makers on the market for making transparent spherical ice. Since spherical ice cubes are different from square ice cubes, when making spherical ice cubes, an upper hemisphere and a lower hemisphere need to be set. The two hemispheres are combined to form a spherical ice making space, and generally only one hemisphere of the upper and lower hemispheres is provided with an evaporator; when removing ice, the hemisphere provided with the evaporator melts the ice through the heat generated by the evaporator, and the spherical ice cube can quickly separate from this hemisphere; however, it is more difficult to remove ice from the other hemisphere without an evaporator, resulting in a lower ice making efficiency of the whole machine.

[0003] To solve the technical problem of difficult ice removal, the invention patent with the authorization announcement number CN102878744A discloses an ice maker, including a tray component, which includes an upper plate tray with an upper ice grid and a lower plate tray with a lower ice grid. The lower ice grid is closely attached to the upper ice grid to form a spherical ice grid; a driving unit, which is arranged on one side of the tray component and is used to provide power, and this power is used to separate one of the upper plate tray and the lower plate tray from the other; an ejecting unit, which is arranged on one side of the tray component and is used to separate the ice cubes formed inside the spherical ice grid; one of the upper plate tray and the lower plate tray moves linearly in the vertical direction through the driving unit. When removing ice in this prior art, first, the driving unit is used to separate the upper plate tray and the lower plate tray to perform the primary peeling of the spherical ice cube, and then the two ejecting units that can move up and down are used to perform the secondary peeling of the spherical ice cube inside the spherical ice grid, and the mechanical peeling of the spherical ice cube can be realized; however, the ejecting unit structure of this prior art is very complex, the cost is very high, and the spherical ice cube is peeled multiple times in a mechanical manner, which is easy to damage the spherical ice cube. Although the ice making efficiency of the whole machine can be improved, the yield rate of the spherical ice cube is not high.

[0004] Therefore, there is still room for improvement and development in the prior art. Summary of the Utility Model

[0005] Aiming at the problems in the prior art, the utility model provides an ice making device and an ice maker that are convenient for ice removal, which adopt a heat exchange ice melting method to achieve the ice removal effect of spherical ice cubes, will not damage the spherical ice cubes, not only improve the ice making efficiency of the whole machine, but also improve the yield rate of spherical ice cubes, and have a simpler structure and lower cost.

[0006] In order to achieve the above purpose, the technical solution applied by the utility model is as follows:

[0007] An ice-making device facilitating ice removal includes an upper die assembly of an evaporator, on which a plurality of upper hemispherical ice cells are provided; a lower die assembly, on which a plurality of lower hemispherical ice cells are provided. The lower die assembly is rotatably connected to the upper die assembly through a rotating assembly. The lower hemispherical ice cells are in close contact with the upper hemispherical ice cells to form spherical ice-making cells; a heat exchange device is correspondingly provided outside the lower hemispherical ice cells. With such a setting, its working principle is as follows: During ice-making, the rotating assembly works to drive the lower die assembly to be in close contact with the upper die assembly of the evaporator to form spherical ice-making cells, and the ice maker transfers cold to the spherical ice-making cells to achieve ice-making; during ice removal, the reversing valve of the ice maker works to transfer heat to the upper die assembly of the evaporator, melting the ice at the contact surface between the spherical ice cubes and the upper hemispherical ice cells, realizing the separation of the spherical ice cubes from the upper hemispherical ice cells; it should be noted that since there is no evaporator in the lower hemispherical ice cells and the distance between the lower hemispherical ice cells and the evaporator is relatively far, it takes a long time for heat to transfer from the evaporator to the lower hemispherical ice cells. At this time, the spherical ice cubes will adhere to the inside of the lower hemispherical ice cells. The rotating assembly works to drive the lower die assembly to separate from the upper die assembly of the evaporator, and the heat exchange device is used to exchange heat on the outside of the lower hemispherical ice cells, so as to melt the ice at the contact surface between the spherical ice cubes and the lower hemispherical ice cells, and the spherical ice cubes fall off. It should be noted that compared with the prior art, the present utility model adopts a heat exchange ice melting method to achieve the ice removal effect of spherical ice cubes, which will not damage the spherical ice cubes, improves the overall ice-making efficiency, improves the yield rate of spherical ice cubes, and has a simpler structure and lower cost.

[0008] According to the above solution, the heat exchange device includes a first water tank and a convection channel provided in the lower die assembly and corresponding to the outside of the lower hemispherical ice cells; a water outlet pipe is provided on the first water tank, and a channel inlet and a channel outlet are respectively provided at both ends of the convection channel, and the channel inlet is correspondingly arranged with the water outlet pipe. With such a setting, the water in the first water tank flows into the convection channel through the water outlet pipe to wash and exchange heat on the outside of the lower hemispherical ice cells, so as to melt the ice at the contact surface between the spherical ice cubes and the lower hemispherical ice cells.

[0009] According to the above solution, the lower die assembly includes a housing and a plurality of hollow hemispheres, and the plurality of hollow hemispheres are fixedly spaced on the housing. The inner cavity of the hollow hemisphere forms the lower hemispherical ice cell, and a convection channel is formed between the outer wall of the hollow hemisphere and the inner wall of the housing. With such a setting, its structure is simple, and the water flowing through the convection channel can wash the entire outer wall surface of the hollow hemisphere, and the ice removal effect is better. Preferably, the housing is made of plastic material, and the lower hemispherical ice cell is made of metal material, which can ensure that the cold will not be lost through the housing.

[0010] According to the above solution, the rotation angle of the lower die assembly relative to the upper die assembly of the evaporator is 0-90 degrees; with this setting, when the rotation angle of the lower die assembly relative to the upper die assembly of the evaporator is 0 degrees, the lower die assembly is in close contact with the upper die assembly of the evaporator for ice making; when the rotation angle of the lower die assembly relative to the upper die assembly of the evaporator is 90 degrees, the channel inlet of the convection channel and the water outlet pipe of the first water tank are arranged vertically corresponding to each other for ice removal. Preferably, the aperture of the channel inlet is larger than that of the water outlet pipe, so as to ensure that the channel inlet can fully receive the water discharged from the water outlet pipe, avoid water loss, and have a better scouring effect on the convection channel.

[0011] According to the above solution, the rotating assembly includes a rotating shaft and a driving assembly. The upper die assembly of the evaporator is hinged to the rotating shaft, and the lower die assembly is fixedly connected to the rotating shaft. The rotating shaft is driven to rotate by the driving assembly. With this setting, the driving assembly drives the rotating shaft to rotate, so as to achieve the purpose of driving the lower die assembly to rotate synchronously, and further realize the control of the close contact or separation between the lower die assembly and the upper die assembly of the evaporator.

[0012] According to the above solution, it further includes a second water tank. The second water tank is arranged below the lower die assembly, and an ice receiving basket is arranged in the second water tank; a first water pump assembly is arranged between the opening of the second water tank and the first water tank. With this setting, the ice shed from the lower die assembly can directly fall into the ice receiving basket under the action of gravity, and the water discharged from the channel outlet of the convection channel can fall into the second water tank. Under the action of the first water pump assembly, the water in the second water tank is pumped into the first water tank for storage, forming a water flow circulation loop.

[0013] According to the above solution, the channel inlet and the water outlet pipe are connected by a water pipe. With this setting, water loss can be avoided.

[0014] According to the above solution, a first water pump assembly is arranged between the second water tank and the channel inlet. With this setting, during ice removal, the water in the second water tank is directly pumped into the convection channel by the first water pump assembly to scour the outer wall of the lower hemisphere ice, and is discharged back into the second water tank through the channel outlet.

[0015] An ice maker includes a machine body. A refrigeration component, a third water tank and the above ice making device for convenient ice removal are arranged on the machine body. The refrigeration component is connected to the upper die assembly of the evaporator through a pipeline; the third water tank is arranged in the second water tank and is located below the water outlet pipe of the first water tank. A second water pump assembly is arranged between the second water tank and the lower hemisphere ice grid of the lower die assembly. With this setting, the refrigeration component transfers cold or heat to the upper die assembly of the evaporator to achieve ice making and ice removal; the second water pump assembly pumps the water in the second water tank into the spherical ice making grid for ice making.

[0016] According to the above solution, a spray pipe is connected to the inner cavity of the lower hemisphere ice tray, and the spray pipe is connected to the second water pump assembly. With this arrangement, the inner cavity of the spherical ice tray is sprayed with water to make ice, resulting in a better ice-making effect and transparent spherical ice can be made. Preferably, multiple lower hemisphere ice trays are connected to each other, which can make the spherical ice produced by the whole machine more stable and uniform in effect, and the ice-making effect is better.

[0017] According to the above solution, a drain port is provided at the bottom of the second water tank, and an overflow port is provided at the upper part of the second water tank. With this arrangement, after ice-making and ice-detaching are completed, the water in the second water tank can flow back into the second water tank through the drain port; through the overflow port, it can ensure that the amount of water for ice-making is equal in each round of ice-making; when the water reaches the overflow port, the excess water will flow back into the second water tank.

[0018] According to the above solution, the third water tank is rotatably arranged in the second water tank through a rotating assembly. With this arrangement, during ice-detaching, the third water tank rotates synchronously with the lower die assembly, and the spherical ice cubes fall onto the ice receiving basket. At the same time, the water in the third water tank is directly poured into the second water tank.

[0019] Advantages of the present utility model:

[0020] With the present utility model arranged in this way, the ice-detaching effect of spherical ice cubes is achieved by the ice-melting method, which will not damage the spherical ice cubes, improves the ice-making efficiency of the whole machine, increases the yield rate of spherical ice cubes, and has a simpler structure and lower cost. Description of the drawings

[0021] Figure 1 is a schematic diagram of the ice-detaching state of the ice-making device of the present utility model;

[0022] Figure 2 is a cross-sectional view of the ice-detaching state of the ice-making device of the present utility model;

[0023] Figure 3 is a cross-sectional view of the lower die assembly of the present utility model;

[0024] Figure 4 is a partially sectional schematic diagram of an ice-making machine of the present utility model;

[0025] Figure 5 is a schematic diagram of the ice-making state of the ice-making device of the present utility model;

[0026] Figure 6 is a cross-sectional view of the ice-making state of the ice-making device of the present utility model.

[0027] In the figure:

[0028] 1. Upper die assembly of evaporator; 2. Upper hemisphere ice tray; 3. Lower die assembly; 4. Lower hemisphere ice tray; 5. Evaporator assembly; 6. Rotating shaft; 7. Driving assembly; 8. Water tank 1; 9. Water outlet pipe; 10. Water tank 2; 11. Water pump assembly 1; 13. Housing; 14. Hollow hemisphere; 15. Convection channel; 16. Channel inlet; 17. Channel outlet; 18. Ice cube; 20. Machine body; 21. Refrigeration assembly; 22. Water pump assembly 2; 23. Water tank 3; 24. Spray pipe; 25. Overflow port. Detailed implementation mode

[0029] The technical solution of the present utility model will be described below in conjunction with the accompanying drawings and embodiments.

[0030] Embodiment 1:

[0031] As Figures 1 to 3 shown, a kind of ice-making device convenient for ice removal of the present utility model includes an upper die assembly 1 of an evaporator, and a plurality of upper hemisphere ice trays 2 are arranged on the upper die assembly 1; a lower die assembly 3, and a plurality of lower hemisphere ice trays 4 are arranged on the lower die assembly 3. The lower die assembly 3 is rotatably connected to the upper die assembly 1 through a rotating assembly, and the lower hemisphere ice tray 4 is closely attached to the upper hemisphere ice tray 2 to form a spherical ice-making grid; a heat exchange device is correspondingly arranged outside the lower hemisphere ice tray. The present utility model is arranged in this way, and its working principle is: during ice making, the rotating assembly works to drive the lower die assembly 3 to be closely attached to the upper die assembly 1 of the evaporator to form a spherical ice-making grid, and the ice maker transfers cold to the spherical ice-making grid to realize ice making; during ice removal, the reversing valve of the ice maker works to transfer heat to the upper die assembly 1 of the evaporator, so that the contact surface of the spherical ice cube and the upper hemisphere ice tray 2 melts ice, realizing the separation of the spherical ice cube from the upper hemisphere ice tray 2; it should be noted that since there is no evaporator in the lower hemisphere ice tray 4 and the distance between the lower hemisphere ice tray 4 and the evaporator is relatively far (the evaporator is arranged at the top of the upper die assembly 1 of the evaporator), it takes a long time for heat to be transferred from the evaporator to the lower hemisphere ice tray 4. At this time, the spherical ice cube will stick in the lower hemisphere ice tray 4. The rotating assembly works to drive the lower die assembly 3 to be separated from the upper die assembly 1 of the evaporator, and the heat exchange device is used to exchange heat on the outside of the lower hemisphere ice tray 4, so that the contact surface of the spherical ice cube and the lower hemisphere ice tray 4 melts ice, and the spherical ice cube falls off. It should be noted that the present utility model adopts the heat exchange ice melting method to realize the ice removal effect of the spherical ice cube, which will not damage the spherical ice cube, improves the ice-making efficiency of the whole machine, and improves the yield rate of the spherical ice cube.

[0032] In this embodiment, the heat exchange device includes a first water tank 8 and a convection channel 15 disposed within the lower die assembly 3 and corresponding to the outer side of the lower hemisphere ice tray 4; a water outlet pipe 9 is provided on the first water tank 8, and a channel inlet 16 and a channel outlet 17 are respectively provided at both ends of the convection channel 15, and the channel inlet 16 is correspondingly arranged with the water outlet pipe 9. With this arrangement, the water in the first water tank 8 flows into the convection channel 15 through the water outlet pipe 9 to wash and exchange heat with the outer side of the lower hemisphere ice tray 4, so that the spherical ice cubes melt the ice on the contact surface with the lower hemisphere ice tray 4.

[0033] In practical applications, the first water tank 8 is arranged on one side of the evaporator upper die assembly 1 to make reasonable use of the installation space. The water outlet pipe 9 is arranged at the bottom of the first water tank 8, which can ensure that all the water in the first water tank 8 can flow out smoothly through the water outlet pipe 9 to prevent water accumulation, and the number of the water outlet pipes 9 is the same as the number of the lower hemisphere ice trays 4.

[0034] In this embodiment, the lower die assembly 3 includes a housing 13 and a plurality of hollow hemispheres 14. The plurality of hollow hemispheres 14 are fixedly arranged on the housing 13 at intervals. The inner cavity of the hollow hemisphere 14 forms the lower hemisphere ice tray 4, and a convection channel 15 is formed between the outer wall of the hollow hemisphere 14 and the inner wall of the housing 13. With this arrangement, the structure is simple, and the water in the convection channel 15 can wash the entire outer wall surface of the hollow hemisphere 14, and the ice removal effect is better.

[0035] Preferably, the housing 13 is made of plastic material, and the lower hemisphere ice tray 4 is made of metal material, which can ensure that the cold quantity will not be lost through the housing 13.

[0036] In this embodiment, the rotation angle of the lower die assembly 3 relative to the evaporator upper die assembly 1 is 0 - 90 degrees; with this setting of the present invention, when the rotation angle of the lower die assembly 3 relative to the evaporator upper die assembly 1 is 0 degree, the lower die assembly 3 is in close contact with the evaporator upper die assembly 1 for ice making; when the rotation angle of the lower die assembly 3 relative to the evaporator upper die assembly 1 is 90 degrees, the channel inlet 16 of the convection channel 15 and the water outlet pipe 9 of the first water tank 8 are arranged vertically corresponding to each other for ice removal.

[0037] Preferably, the aperture of the channel inlet 16 is larger than the aperture of the water outlet pipe 9, which can ensure that the channel inlet 16 can fully receive the water discharged from the water outlet pipe 9, avoid water loss, and have a better flushing effect on the convection channel 15.

[0038] In this embodiment, the rotating assembly includes a rotating shaft 6 and a driving assembly 7. The evaporator upper die assembly 1 is hinged to the rotating shaft 6, the lower die assembly 3 is fixedly connected to the rotating shaft 6, and the rotating shaft 6 is driven to rotate by the driving assembly 7. With this arrangement, the driving assembly 7 drives the rotating shaft 6 to rotate, so as to achieve the purpose of driving the lower die assembly 3 to rotate synchronously, and further achieve the control of the close contact or separation between the lower die assembly 3 and the evaporator upper die assembly 1.

[0039] In this embodiment, it further includes a second water tank 10, the second water tank 10 is arranged below the lower die assembly 3, and an ice receiving basket is arranged in the second water tank 10; a first water pump assembly 11 is arranged between the opening of the second water tank 10 and the first water tank 8. With this arrangement, the ice shed from the lower die assembly 3 can directly fall into the ice receiving basket under the action of gravity, and the water discharged from the channel outlet 17 of the convection channel 15 can fall into the second water tank 10. Under the action of the first water pump assembly 11, the water in the second water tank 10 is pumped into the first water tank 8 for storage, forming a water flow circulation loop.

[0040] As Figures 4 to 6 shown, an ice maker includes a machine body 20, a refrigeration component 21, a third water tank 23 and the above-mentioned ice making device facilitating ice shedding are arranged on the machine body 20, and the refrigeration component 21 is connected to the evaporator upper die assembly 1 through a pipeline; the third water tank 23 is arranged in the second water tank 10 and is located below the water outlet pipe 9 of the first water tank 8, and a second water pump assembly 22 is arranged between the second water tank 10 and the lower hemispherical ice lattice 4 of the lower die assembly 3. With this arrangement, the refrigeration component 21 transfers cold or heat to the evaporator upper die assembly 1 to realize ice making and ice shedding; the second water pump assembly 22 pumps the water in the second water tank 10 and sends it into the spherical ice making lattice for ice making.

[0041] In this embodiment, a spray pipe 24 is connected to the inner cavity of the lower hemispherical ice lattice 4, and the spray pipe 24 is connected to the second water pump assembly 22. With this arrangement, the inner cavity of the spherical ice making lattice is spray-ice made through the spray pipe 24, and the ice making effect is better, and transparent spherical ice can be made.

[0042] Preferably, a plurality of the lower hemispherical ice lattices 4 are communicated with each other, so that the spherical ice effect made by the whole machine is more stable and unified, and the ice making effect is better.

[0043] In this embodiment, a drain port is arranged at the bottom of the second water tank 23, and an overflow port 25 is arranged at the upper part of the second water tank 23. With this arrangement, after ice making and ice shedding are completed, the water in the second water tank 23 can flow back into the second water tank 10 through the drain port; through the overflow port 25, it can be ensured that the ice making water volume is equal in each round of ice making. When the water reaches the overflow port 25, the excess water will flow back into the second water tank 10 again.

[0044] Embodiment Two:

[0045] In this embodiment, the channel inlet 16 and the water outlet pipe 9 are connected through a water pipe. With this arrangement, water loss can be avoided.

[0046] The difference between this Embodiment Two and Embodiment One is that a water pipe connection is added between the channel inlet 16 and the water outlet pipe 9, and the rest of the structures and working principles are the same as those of Embodiment One, and will not be repeated here.

[0047] Embodiment Three:

[0048] In this embodiment, a water pump assembly is provided between the second water tank 10 and the channel inlet 16. With this arrangement, during de-icing, the water in the second water tank 10 is directly pumped out through the water pump assembly into the convection channel 15 to wash the outer wall of the lower hemisphere ice tray 4, and then discharged back into the second water tank 10 through the channel outlet 17.

[0049] The difference between this Embodiment Three and Embodiment One is that the setting of the first water tank 8 is saved, and the rest of the structure and working principle are the same as those in Embodiment One, so no repeated description will be made.

[0050] Embodiment Four:

[0051] In this embodiment, the third water tank 23 is rotatably arranged in the second water tank 10 through a rotating assembly. With this arrangement, during de-icing, the third water tank 23 rotates synchronously with the lower mold assembly 3, the spherical ice cubes fall onto the ice receiving basket, and at the same time, the water in the third water tank 23 is directly poured into the second water tank 10.

[0052] The difference between this Embodiment Four and Embodiment One is that the third water tank 23 can rotate synchronously with the lower mold assembly 3, saving the setting of the drain port, and the rest of the structure and working principle are the same as those in Embodiment One, so no repeated description will be made.

[0053] The embodiments of the present utility model have been described above in conjunction with the accompanying drawings. However, the present utility model is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present utility model, those of ordinary skill in the art can also make many forms without departing from the purpose and scope protected by the claims of the present utility model, and all of them fall within the protection scope of the present utility model.

Claims

1. An ice-making device for convenient ice removal, characterized in that: include: An evaporator upper mold assembly, wherein the evaporator upper mold assembly is provided with a plurality of upper hemispherical ice trays; A lower mold assembly, wherein a plurality of lower hemispherical ice trays are arranged on the lower mold assembly, and the lower mold assembly is rotatably connected to the upper mold assembly through a rotating assembly, and the lower hemispherical ice trays are closely attached to the upper hemispherical ice trays to form spherical ice trays; A heat exchange device is correspondingly arranged on the outer side of the lower hemisphere ice tray.

2. The ice-making device for convenient ice removal according to claim 1, characterized in that: The heat exchange device includes a water tank and a convection channel arranged in the lower mold assembly and corresponding to the outer side of the lower hemisphere ice tray; the water tank is provided with a water outlet pipe, and the convection channel is provided with a channel inlet and a channel outlet at both ends, and the channel inlet is arranged corresponding to the water outlet pipe.

3. The ice-making device for convenient ice removal according to claim 2, characterized in that: The lower mold assembly includes a shell and a plurality of hollow hemispheres, wherein the plurality of hollow hemispheres are fixed on the shell at intervals, the inner cavity of the hollow hemispheres forms a lower hemisphere ice tray, and a convection channel is formed between the outer wall of the hollow hemisphere and the inner wall of the shell.

4. The ice-making device for convenient ice removal according to claim 2, characterized in that: The rotation angle of the lower mold assembly relative to the upper mold assembly of the evaporator is 0-90 degrees; when the rotation angle of the lower mold assembly relative to the upper mold assembly of the evaporator is 0 degree, the lower mold assembly is tightly attached to the upper mold assembly of the evaporator; when the rotation angle of the lower mold assembly relative to the upper mold assembly of the evaporator is 90 degrees, the channel inlet of the convection channel and the water outlet pipe of the water tank are arranged in upper and lower correspondence.

5. The ice-making device for convenient ice removal according to claim 1, characterized in that: The rotating assembly comprises a rotating shaft and a driving assembly. The upper mold assembly of the evaporator is hinged to the rotating shaft, the lower mold assembly is fixedly connected to the rotating shaft, and the rotating shaft is driven to rotate by the driving assembly.

6. The ice-making device for convenient ice removal according to claim 2, characterized in that: It also includes a second water tank, which is arranged below the lower mold assembly. An ice receiving basket is arranged inside the second water tank; and a water pump assembly 1 is arranged between the openings of the second water tank and the first water tank.

7. The ice-making device for convenient ice removal according to claim 2, characterized in that: The channel inlet and the water outlet pipe are connected via a water pipe.

8. An ice making machine, characterized in that: It includes a machine body, on which are provided a refrigeration assembly, a water tank three and an ice-making device for convenient ice-removal as described in any one of claims 1 to 7, wherein the refrigeration assembly is connected to the evaporator upper mold assembly through a pipeline; the water tank three is arranged in the water tank two and is located below the water outlet pipe of the water tank one, and a water pump assembly two is arranged between the water tank two and the lower hemisphere ice grid of the lower mold assembly.

9. An ice making machine according to claim 8, characterized in that: The inner cavity of the lower hemisphere ice tray is connected with a spray pipe, and the spray pipe is connected to the second water pump component.

10. The ice making machine according to claim 8, characterized in that: A drain outlet is provided at the bottom of the second water tank, and an overflow outlet is provided at the top of the second water tank.

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