TW201819723A - Drainage chamber - Google Patents

Abstract

An object of the present application is to provide a drainage chamber (20) for draining drainage without using power. The drainage chamber (20) comprises: a storage tank (26), that is installed by penetrating a floor 40 in an underfloor space (V), a drainage introduction pipe (18) and a horizontal pipe (32) being connected to the storage tank (26) in the underfloor space (V), and an air layer portion (24) being formed in a upper portion in a state where drainage is stored; and a waterproof pan (50) placed on the storage tank (26).

Description

   Drainage chamber   

The invention relates to a drainage chamber used in a siphon type drainage system.

The following Patent Document 1 discloses a residential facility that uses a drainage pump to drain water from a sewage tank disposed under the floor under a washstand in a single-room apartment toward a drainage port on the floor.

[Previous Technical Literature]

[Patent Literature]

Patent Document 1: Japanese New Registration No. 3141360

In the above-mentioned Patent Document 1, since a discharge pump is used for the outflow and drainage system, power is required.

The present invention has been made in consideration of the above-mentioned facts, and an object thereof is to provide a chamber for draining water without using power.

The drainage chamber of claim 1 is provided with a storage tank, which is arranged in the space under the bottom plate through the bottom plate, and the drainage introduction pipe is connected to the outlet pipe in the space under the bottom plate, and the drainage is stored in the state Next, an air layer part is formed on the upper part; and a waterproof disc is placed in the storage tank.

The drainage chamber of claim 1 is because the storage tank arranged in the space under the floor will penetrate the bottom plate, so the storage tank will be deeper and can store more drainage than the case where the storage tank is only set in the space under the floor. . Thereby, the water level differential pressure of the drainage is increased, and the water pressure of the drainage flowing out from the outlet pipe is increased. This eliminates the need for power to allow drainage to flow out.

In addition, since the storage tank will penetrate the bottom plate, the height of the bottom plate will not be limited by the depth of the storage tank. Therefore, the drainage capacity of the drainage chamber can be ensured, and the height of the bottom plate can be controlled to be low. This will increase the ceiling height of the living room.

In addition, since the waterproof disc is placed in the storage tank, drainage can be caused to flow from the waterproof disc into the storage tank. Therefore, it is not necessary to lay a cross-drawing pipe from the waterproof pan to the drainage chamber.

The drainage chamber of claim 2 is the drainage chamber of claim 1, and the waterproof pan is formed with a releasable drainage trap, and the drainage flows from the drainage trap to the storage tank.

The drainage chamber according to claim 2 can be used to clean and check the inside of the storage tank by unloading the drainage trap of the waterproof tray. Therefore, the inside of the daily storage tank can be cleaned and inspected while the washing machine is placed on the waterproof tray. Also, since a trap is formed in the waterproof pan, the odor from the drainage remaining in the storage tank can be masked.

The drainage chamber of claim 3 is in the drainage chamber of claim 1 or 2, and the diameter of the outlet pipe is formed to be smaller than the diameter of the introduction pipe.

According to the drainage chamber of claim 3, by making the diameter of the outlet pipe smaller than the diameter of the introduction pipe, the flow passage area is made small to increase the flow velocity. This can improve drainage capacity.

The drainage chamber of claim 4 is in the drainage chamber of any of claims 1 to 3, and the storage tank is connected with a vent tube in the space under the bottom plate; the vent tube will pass through the storage tube stored in the storage tank. Drain water and open in this gas layer.

According to the drainage chamber of claim 4, since the vent pipe will pass through the drained water stored in the storage tank, the position of the vent pipe will be lower than in the case where the vent pipe is not drained. Therefore, the height of the bottom plate can be reduced.

The drainage chamber of claim 5 is in the drainage chamber of any one of claims 1 to 4, and the waterproof pan becomes a cover of the storage tank and is formed to be unloadable.

According to the drainage chamber of claim 5, if the waterproof tray is unloaded, the inside of the storage tank can be inspected. Therefore, compared with the case of unloading the drainage trap, it is necessary to carry out detailed conservative inspection and improve cleaning efficiency.

According to the drainage chamber of the present invention, the drainage can be discharged without using power.

18‧‧‧Drain introduction pipe (introduction pipe)

18A‧‧‧Drain introduction pipe (introduction pipe)

18C‧‧‧Storage tank

20‧‧‧Draining chamber

24‧‧‧Air layer department

26‧‧‧Storage tank

32‧‧‧Horizontal tube (export tube)

32A‧‧‧Horizontal tube (export tube)

32B‧‧‧Horizontal tube (export tube)

32C‧‧‧Horizontal tube (export tube)

36‧‧‧ Snorkel

40‧‧‧ bottom plate

50‧‧‧Waterproof plate

58‧‧‧Drain trap

V‧‧‧ Space under the floor

FIG. 1 is a longitudinal sectional view showing a schematic configuration of a siphon type drainage system to which a drainage chamber according to an embodiment of the present invention is applied.

Fig. 2 is a side sectional view showing a drainage chamber according to an embodiment of the present invention.

Fig. 3 is a sectional view taken along line 3-3 in Fig. 2 showing a drainage chamber according to an embodiment of the present invention.

Fig. 4 is a sectional view taken along line 4-4 in Fig. 2 showing a drainage chamber according to an embodiment of the present invention.

FIG. 5 is a sectional view taken along line 5-5 in FIG. 2 showing a drainage chamber according to an embodiment of the present invention.

Fig. 6 is a sectional view taken along line 6-6 in Fig. 2 showing a drainage chamber according to an embodiment of the present invention.

FIG. 7 (A) is a plan view showing a collective house provided with a drainage chamber according to an embodiment of the present invention, showing that the water collecting device is arranged inside the house, and the piping space is arranged at the position delimited by the house and the wall. (B) shows an example in which the water collecting device is arranged outside the house and the piping space is arranged in the house. (C) shows a water collecting device is arranged outside the house, and An example of arranging piping space in a location demarcated by a house and a wall.

FIG. 8 is a side cross-sectional view showing a modified example in which the raised height of the flange portion of the storage tank is increased in the drainage chamber according to the embodiment of the present invention.

FIG. 9 is a side cross-sectional view showing a modified example in which a storage tank portion is integrally formed with a waterproof disc in a drainage chamber according to an embodiment of the present invention.

FIG. 10 is a side sectional view showing a modified example in which a flange portion of a storage tank is extended from an upper portion to a lower portion of a bottom plate in a drainage chamber according to an embodiment of the present invention.

(Siphonic drainage system)

FIG. 1 is a longitudinal sectional view showing a schematic configuration of a siphon type drainage system 10 to which a drainage chamber 20 according to this embodiment is applied.

The siphon type drainage system 10 is a drainage device that uses siphon force to discharge the drainage from the water collecting device 17 and is used to form a multi-floor collective house 12.

The siphon type drainage system 10 is provided with a drainage riser 38 for draining water downward, and the drainage riser 38 is provided in a plurality of places in the housing complex 12 in a plan view. For example, as shown in the plan view of FIG. 7 (A), it is stored vertically and vertically (longitudinal) in the piping spaces of each apartment 12A, 12B, 12C, 12D, 12E, and 12F that partition each floor of the housing 12 by walls. (Also referred to as duct space, PS, etc.) 15 and, as shown in FIG. 1, will pass through the floor 16 of each floor of the collective house 12.

The housing 12A of the collective house 12 is provided with a plurality of water collecting appliances 17 (washing table 17A, washing machine 17B, and bathroom 17C). These water collecting appliances 17 are connected to drain water discharged by the water collecting appliance 17 respectively. One end of the drainage introduction pipe 18. In addition, the other end of the drainage introduction pipe 18 is connected to the drainage chamber 20, and the drainage introduction pipe 18 is arranged obliquely so that the drainage chamber 20 side becomes lower.

The drainage chamber 20 is a drainage device for temporarily storing the drainage from the water collecting device 17 and discharging the drainage to the drainage standpipe 38. A siphon drainage pipe 30 is connected to the downstream side of the drainage.

This siphon type drainage pipe 30 is provided with a horizontal pipe (also referred to as a cross-drawn pipe) 32 arranged along the bottom plate 16 and an outflow vertical pipe (also referred to as a vertical pipe) 34 and a horizontal pipe 32 communicating with the horizontal pipe 32. Will communicate with the drainage chamber 20.

The horizontal pipe 32 is arranged on the bottom plate 16 in a horizontal direction without being inclined. The outflow vertical pipe 34 communicating with the horizontal pipe 32 is arranged in the up-down direction (vertical direction) along the drainage riser 38. The outflow vertical pipe 34 will reach the junction portion joint 39, which will merge the drainage from the outflow vertical pipe 34 into the drainage riser 38.

In addition, the non-inclined here is not necessarily the horizontal direction, but includes those with a slight step or slope along the floor or ceiling.

The horizontal pipe 32 and the outflow vertical pipe 34 of the siphonic drainage pipe 30 do not merge with other drainage pipes on the way to the junction 39 of the syphon, but are constituted by a continuous pipeline to guide the drainage to the drainage riser 38. . In addition, the diameter (inner diameter) of the horizontal pipe 32 and the outflow vertical pipe 34 of the siphonic drainage pipe 30 will be smaller than the diameter (inner diameter) of the drainage introduction pipe 18, and will be provided in such a way that the drainage flows at full flow It is set that the drainage of the horizontal pipe 32 will use the energy of the siphon-type water level difference to exert a siphon force in the downstream direction of the drainage.

In this embodiment, although the diameters (inner diameters) of the horizontal pipe 32 and the outflow vertical pipe 34 are smaller than the diameters (inner diameters) of the drainage introduction pipe 18, the embodiment of the present invention is not limited to this. As long as a siphon effect is obtained, the diameters of the horizontal pipe 32 and the outflow vertical pipe 34 may be the same as or larger than the diameter (inner diameter) of the drainage introduction pipe 18.

In addition, the drainage chamber 20 is further connected with a vent pipe 36, and the vent pipe 36 passes through the space under the bottom plate to reach the junction 39.

Although the above structure has been described for the housing 12A, the same water collecting device 17, drainage introduction pipe 18, and drainage are provided in the housing 12B, 12C, 12D, and 12E shown in FIG. 7 (A). Chamber 20, siphonic drainage pipe 30. The same applies to other houses and other floors not shown in FIG. 1.

(Draining chamber)

As shown in FIG. 2, the drainage chamber 20 is provided with a box-shaped (slightly rectangular parallelepiped) storage tank 26 formed with a storage part 22 for storing drainage, and a waterproof disc 50 mounted on the storage tank 26. The storage unit 22 is an internal space of the storage tank 26 storing the drain water, and the drainage layer is stored in the storage unit 22 to form an air layer portion 24 on the storage unit 22.

(Storage tank)

The storage tank 26 is a drainage gauge made of vinyl chloride, and is arranged in a space V below the bottom plate in a space between the bottom plate 16 and the bottom plate 40 and penetrates the bottom plate 40. The bottom plate 40 is a composite material including a wood floor plate and a base plate to which the wood floor plate is fixed. The bottom plate 40 is arranged at intervals from the bottom plate 16 by supporting feet (not shown) standing from the bottom plate 16.

In addition, the storage tank 26 is placed on the bottom plate 16 by supporting legs (not shown), and the flange portion 26A of the storage tank 26 is arranged to cover the edge of the through hole of the bottom plate 40 and block the through hole.

The wall surface of the storage tank 26 is formed with a through hole 26B through which the ventilation pipe 36 passes. The vent pipe 36 is bent upward inside the storage tank 26 and opens in the air layer portion 24.

A connection port 22A is formed on a wall surface on the opposite side of the center line CL of the storage portion 22 from the through hole 26B. The connection port 22A is connected to a drainage introduction pipe 18 for introducing drainage from the water collecting device 17 (see FIG. 1) into the storage section 22, and the drainage introduction pipe 18 opens toward the storage section 22.

A connection port 22B is formed on the same wall surface as the through hole 26B. The connection port 22B is a horizontal pipe 32 to which the siphonic drainage pipe 30 is connected, and the horizontal pipe 32 will open toward the storage portion 22.

As shown in FIG. 3, the drainage introduction pipe 18 is configured to include a drainage introduction pipe 18A that introduces drainage from the washstand 17A (see FIG. 1) into the storage unit 22 and a drainage introduction from the bathroom 17C (see FIG. 1). To the drainage introduction pipe 18C of the storage section 22. The drainage introduction pipe 18 is an example of the introduction pipe of the present invention.

The horizontal pipe 32 is a horizontal pipe 32A including a horizontal pipe 32A that mainly discharges water discharged from the drainage introduction pipe 18A to the storage unit 22, and a horizontal pipe that mainly discharges water discharged from the drainage introduction pipe 18C to the storage unit 22. 32 and a horizontal pipe 32B that mainly discharges the drainage introduced from the drainage trap 58 described below to the storage section 22. The horizontal pipe 32 is an example of the lead-out pipe of the present invention.

In addition to the drainage introduced from the drainage introduction pipe 18A to the storage section 22, the horizontal pipe 32A may also discharge drainage introduced from the drainage introduction pipe 18C to the storage section 22, and drainage discharged from the drainage trap 58 to the storage section 22. Among them, the drainage introduced from the drainage collection section 58 to the storage section 22 can be discharged more than the drainage introduced from the drainage introduction pipe 18C to the storage section 22.

Regarding the horizontal pipe 32B, in addition to the drainage introduced from the drainage trap 52 to the storage section 22, the drainage introduced from the drainage introduction pipe 18A to the storage section 22, and the drainage introduced from the drainage introduction pipe 18C to the storage section 22 discharge.

As for the horizontal pipe 32C, in addition to the drainage introduced from the drainage introduction pipe 18C to the storage section 22, the drainage introduced from the drainage introduction pipe 18A to the storage section 22, and the drainage discharged from the drainage trap 58 to the storage section 22 may be discharged. . Among them, the drainage introduced from the drainage collection section 58 to the storage section 22 can be discharged more than the drainage introduced from the drainage introduction pipe 18A to the storage section 22.

The bottom surface of the storage tank 26 is formed with recesses 22C, 22D, and 22E such that drainage from the drainage introduction pipe 18A, the drainage trap 52, and the drainage introduction pipe 18C is discharged from the horizontal pipes 32A, 32B, and 32C, respectively. The recessed portions 22C, 22D, and 22E are inclined so that the drainage flows in a direction indicated by an arrow in FIG. 3.

As shown in FIGS. 4 and 5, the recessed portions 22C, 22D, and 22E are semicircular flow channels when viewed in cross section. As shown in, for example, the water surface H, they come from the drainage introduction pipe 18A, the drainage trap 58, and the drainage introduction pipe 18C. In the case where the drainage amount is small, the respective drainages are discharged toward the horizontal pipes 32A, 32B, and 32C through the recesses 22C, 22D, and 22E. When there is a large amount of drainage, the individual drainages are mixed, and the mixed drainages are discharged toward the horizontal pipes 32A, 32B, and 32C.

(Waterproof disc)

As shown in FIG. 2, a waterproof tray 50 is mounted on the upper portion of the storage tank 26 in a removable state. That is, the waterproof tray 50 also doubles as the cover of the storage tank 26. The waterproof pan 50 is a water-retaining member for preventing the drain water from the washing machine 17B from leaking out of the surface of the bottom plate 40 on the receiving dish on which the washing machine 17B is placed. The bottom 56 of the waterproof pan 50 is provided with a releasable drainage trap 58. The drainage trap 58 is an elbow 59 to which a drainage hose connected to the washing machine 17B (see FIG. 1) can be attached.

Thereby, the drainage from the washing machine 17B is discharged to the storage part 22 of the storage tank 26 via the drainage trap 58. As shown in FIGS. 4 and 5, the ejection port 58B of the drainage trap portion 58 opens at the upper portion of the recessed portion 22D formed on the bottom surface of the storage tank 26, so that the drainage from the washing machine 17B is mainly discharged to the horizontal pipe 32B through the recessed portion 22D.

As shown in FIG. 2, the peripheral portion of the waterproof pan 50 is formed with a raised portion 52 to prevent leakage of laundry drainage. As shown in FIG. 6, the corner portion of the waterproof pan 50 is formed with a raised portion provided with feet of the washing machine 17B. 54. It should be noted that the elevated portion 54 may be omitted. In addition, the position of the drainage collection part 58 in the bottom part 56 can be arbitrarily provided, as long as the discharge port 58B can be opened in the upper part of the recessed part 22D. Moreover, the bottom part 56 does not necessarily need to be provided with the drainage collection part 58, It can also be comprised as the connection port which can be provided with the drainage hose which can be connected to the washing machine 17.

(Effect)

As shown in FIG. 2, the drainage chamber 20 of this embodiment is arranged such that the storage tank 26 penetrates the bottom plate 40. Therefore, compared with the structure in which the storage tank does not penetrate the bottom plate 40 and is only accommodated in the space under the bottom plate, the storage section 22 for storing and draining water can be made deeper. This will increase the pressure of the water level difference of the drainage to increase the water pressure of the drainage flowing out of the horizontal pipes 32A, 32B, 32C. Thereby, the siphon effect can be improved.

In addition, the depth of the storage tank 26 (storage part 22) can be arbitrarily set. For example, as shown in FIG. 8, the height of the flange portion 26A from the bottom plate 40 can be increased to deepen the storage tank 26. With this structure, the siphon effect can be further improved.

The diameter (inner diameter) of the horizontal pipe 32 and the outflow vertical pipe 34 becomes smaller than the diameter (inner diameter) of the drainage introduction pipe 18. This will increase the flow velocity of the drainage and improve the siphon effect.

In addition, by increasing the flow velocity of the drainage, it is difficult for dirt to adhere to the horizontal pipe 32 and the vertical pipe 34. Moreover, even if it is attached, it is easy to wash.

Further, in the drainage chamber 20 of this embodiment, a horizontal pipe 32A mainly passing the drainage from the washstand 17A, a horizontal pipe 32B mainly passing the drainage from the washing machine 17B, and a horizontal pipe mainly passing the drainage from the bathroom 17C. 32C will be connected to the storage tank 26 in order.

Therefore, although the drainage from the washing machine 17B which is used frequently and has a large amount of drainage flows through the recessed portion 22D formed in the central portion of the drainage chamber 20 and is discharged to the horizontal pipe 32B, the drainage also flows through the recessed portions 22C and 22E to be horizontal. The tubes 32A, 32C are discharged. Therefore, even in a house where the use frequency of the bathroom 17C is low, for example, the inside of the horizontal pipe 32C which mainly drains water from the bathroom 17C can be washed.

In addition, by increasing the water pressure and flow velocity of the drainage, even if the distance from the drainage chamber 20 to the piping space 15 (the horizontal drawing distance of the horizontal pipe 32) is long, the siphon effect can be used to circulate from the washstand 17A or the bathroom 17C drainage.

For example, FIG. 7 (A) schematically shows the arrangement of the water collection devices 17 (washstands 17A, washing machines 17B, and bathrooms 17C) in the residential units 12A to 12F of the standard-structure housing complex.

In standard housing complexes, in order to receive light from the outside, most of them have bedrooms on the corridor side and living rooms on the balcony side, while the water collecting device 17 is arranged near the inside of the house. Then, it is preferable that the piping space 15 is provided at a position that divides the housing 12A to 12F by a wall in a manner that is easily handled by a check operator and in a manner that the drainage sound is difficult to hear in the housing space.

However, as shown in FIG. 7 (C), in order to obtain light in the water collecting space or to look at the scenery outside the house when bathing, the water collecting device 17 and the drainage chamber 20 are arranged outside the house 12A to 12F. (Balcony side), the horizontal drawing distance of the horizontal pipe 32 until the piping space 15 is obtained becomes longer. In this case, when the drain chamber 20 is stored only in the space under the floor, a sufficient siphon effect cannot be obtained.

Therefore, in the case where the drainage chamber 20 is housed only in the space under the floor, as shown in FIG. 7 (B), it is preferable that the piping space 15 is provided near the inside of the housing 12A to 12F. In order to shorten the horizontal pull distance of the horizontal pipe 32 countermeasures.

In contrast, in the drainage chamber 20 of the present embodiment, the storage tank 26 of the drainage chamber 20 is disposed through the bottom plate 40, so the siphon effect is improved. Therefore, as shown in FIG. 7 (C), even if the horizontal drawing distance of the horizontal pipe 32 is long, it is possible to circulate without allowing the drainage to stay.

Thereby, the piping space 15 can be set in the position which divides a house 12A-12F by a wall area. As such, according to the drainage chamber 20 of this embodiment, the degree of freedom in the arrangement plan of the water collecting device 17 can be improved.

In the present embodiment, as shown in FIG. 2, the waterproof disk 50 also serves as a cover of the storage tank 26 and is formed to be unloadable. Further, the drainage trap portion 58 is formed to be unloadable from the waterproof pan 50. Therefore, by unloading the waterproof tray 50, the inside of the storage tank 26 can be inspected and cleaned. In addition, during normal inspection, even if the waterproof tray 50 is not unloaded, the inside of the storage tank 26 can be viewed by unloading the drainage trap portion 58. In contrast, in the case where the storage tank 26 and the waterproof pan 50 are separately formed and disposed at different plane positions, for example, it is necessary to provide a check point for the storage tank 26 in the bottom plate 40.

In addition, in the drainage chamber 20 of this embodiment, both the waterproof pan 50 and the drainage trap 58 formed by the waterproof pan 50 can be unloaded, but the embodiment of the present invention is not limited to this. For example, even if the waterproof tray 50 is not unloadable, the drainage trap 58 can still be unloaded reliably to check and clean the storage tank 26. Or, even if the drainage trap 58 is not removable, the waterproof tray 50 can still be reliably unloaded to check and clean the storage tank 26.

Moreover, in the drainage chamber 20 of this embodiment, as shown in FIG. 2, the storage tank 26 and the waterproof pan 50 are configured separately, and the waterproof pan 50 is placed on the upper part of the storage tank 26. However, the present invention The embodiment is not limited to this.

For example, the drainage chamber 60 shown in FIG. 9 may be integrally formed by integrally forming a storage tank portion 62 for storing drainage, an elevated portion 64 provided with a washing machine, and a lifting portion 66 to prevent water from leaking toward the upper portion of the bottom plate 40. Unload the cover 68 of the storage tank portion. If the drainage chamber is structured as such, since the storage tank part also doubles as a waterproof pan, it is possible to reduce the number of parts requiring water-stopping treatment. Thus, the structure of the drainage equipment can be simplified.

In addition, in the drainage chamber 20 of this embodiment, as shown in FIG. 2, the flange portion 26A of the storage tank 26 is disposed so as to cover the edge portion of the through hole of the bottom plate 40. The embodiment is not limited to this.

For example, the drainage chamber 70 shown in FIG. 10 may be used to extend the flange portion 72A of the storage tank 72 from the upper portion of the bottom plate 40 to the lower portion (the space under the bottom plate), and fit the flange portion 72A to the bottom plate. 40 through holes. With this configuration, the drainage introduction pipe 18, the horizontal pipe 32, the ventilation pipe 36, and the drainage chamber 70 can be provided together, and then the bottom plate 40 can be laid. Therefore, the engineering management of the equipment fortification and the floor fortification can be made easy.

In addition, in the drainage chamber 20 of this embodiment, the vent pipe 36 is connected to the storage tank 26, but the embodiment of the present invention is not limited to this. The storage tank 26 may be vented to the storage tank 26 by using a valve body such as a vent valve.

Claims (9)

    A drainage chamber is provided with: a storage tank, which penetrates the bottom plate and is arranged in the space under the bottom plate, and the drainage introduction pipe is connected to the outlet pipe in the space under the bottom plate, and in a state where the drainage is stored, An air layer part is formed on the upper part; and a waterproof disc is placed in the storage tank.         For example, in the drainage chamber of the scope of application for the patent, the waterproof tray is formed with a drainage trap that can be unloaded, and the drainage flows from the drainage trap to the storage tank.         For example, the drainage chamber of the scope of patent application No. 1 or 2, wherein the diameter of the lead-out pipe is formed to be smaller than the diameter of the lead-in pipe.         For example, the drainage chamber of the scope of patent application No. 1 or 2, wherein the storage tank is connected with a vent pipe under the bottom space; the vent pipe will pass through the drain stored in the storage tank and open at the gas layer part. .         For example, the drainage chamber of the patent application No. 3, wherein the storage tank is connected with a vent pipe in the space below the bottom plate; the vent pipe will pass through the drainage stored in the storage tank and open at the gas layer portion.         For example, the drainage chamber of the scope of patent application No. 1 or 2, in which the waterproof tray will become the cover of the storage tank, and is formed to be unloadable.         For example, the drainage chamber of the scope of application for patent No. 3, wherein the waterproof plate will become the cover of the storage tank and formed to be unloadable.         For example, the drainage chamber of the fourth scope of the patent application, wherein the waterproof tray will become the cover of the storage tank and formed to be unloadable.         For example, the drainage chamber of the scope of application for patent No. 5 in which the waterproof tray will become the cover of the storage tank and formed to be unloadable.