CN215053730U - Rainwater treatment device - Google Patents

Abstract

The utility model belongs to the field of water resource recovery, sponge city construction, rainwater management and control, and discloses a rainwater treatment device, which comprises a barrel, a filter cartridge and a valve plate mechanism, wherein a vertically arranged baffle is arranged in the barrel, the baffle divides the barrel into an overflow chamber and a water inlet chamber, the overflow chamber is provided with a water outlet, the water inlet chamber is provided with a water inlet and a backflow port, and the water inlet is positioned below the backflow port; the filter cartridge is arranged in the overflow chamber, a water inlet of the filter cartridge is communicated with the water inlet chamber, a water outlet of the filter cartridge is communicated with a water outlet, a space is formed between the outer wall of the filter cartridge and the inner wall of the cylinder body, and the filter cartridge is used for filtering rainwater; the valve plate mechanism is arranged in the water inlet chamber and used for closing the water inlet when the water level of the water inlet chamber rises and opening the water inlet when the water level of the water inlet chamber falls. The utility model discloses not only can separate initial stage rainwater and middle and later stage rainwater, can directly arrange outside the back again to the initial stage rainwater in addition purifies, improve the earth's surface runoff control rate and cut the rate of subtracting with the non-point source pollution.

Description

Rainwater treatment device

Technical Field

The utility model relates to a fields such as water resource utilization, sponge city, rainwater management and control indicate a rainwater processing apparatus especially.

Background

Along with the development of industry, the increase of population and the advance of urbanization, water resources become increasingly deficient, rainwater flows off in vain during concentrated rainfall, flood disasters can be formed, and the recovery and the utilization of the rainwater become more and more important. The recovery and utilization of rainwater means that rainfall runoff collected from hardened earth surfaces of roofs, roads, squares and the like of buildings is collected, transported and stored to supply greening, landscape water bodies, washing and underground water sources. The existing house rainwater device is connected into a rainwater collecting pipe to collect roof rainwater, but cannot separate initial dirty rainwater from later clean rainwater, and in related engineering projects, the roof rainwater can only be controlled by two modes of terminal regulation and rainwater pipe disconnection, so that the design of a rainwater drainage system is greatly limited.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a rainwater processing apparatus not only can separate initial stage rainwater and middle and later stage rainwater, can carry out the outer row of initial stage purification back again to initial stage rainwater moreover.

The utility model provides a technical scheme as follows:

a rainwater treatment apparatus comprising:

the water inlet device comprises a barrel, wherein a vertically arranged partition plate is arranged in the barrel and divides the barrel into an overflow chamber and a water inlet chamber, the overflow chamber is provided with a water outlet, the water inlet chamber is provided with a water inlet and a backflow port, and the water inlet is positioned below the backflow port;

the filter cylinder is arranged in the overflow chamber, a water inlet of the filter cylinder is communicated with the water inlet chamber, a water outlet of the filter cylinder is communicated with the water outlet, a gap is reserved between the outer wall of the filter cylinder and the inner wall of the cylinder body, and the filter cylinder is used for filtering rainwater;

and the valve plate mechanism is arranged in the water inlet chamber and used for closing the water inlet when the water level of the water inlet chamber rises and opening the water inlet when the water level of the water inlet chamber falls.

Further preferably, the valve plate mechanism comprises a support member, a connecting rod, a first floating ball and a valve plate, the support member is arranged at the bottom of the water inlet chamber, the connecting rod is hinged to the support member, the first floating ball is arranged at one end of the connecting rod, the valve plate is arranged at the other end of the connecting rod, and the valve plate is used for sealing the water inlet.

Further preferably, the connecting rod includes a first connecting rod and a second connecting rod, the first connecting rod is hinged to the supporting member, the first floating ball is disposed at one end of the first connecting rod, the other end of the first connecting rod is hinged to one end of the second connecting rod, and the valve plate is disposed at the other end of the second connecting rod.

Further preferably, one end of the valve plate is hinged to the partition plate, and the other end of the valve plate corresponds to the end of the water inlet.

Further preferably, the valve plate mechanism further comprises a rotating shaft, a third connecting rod, a second floating ball and a baffle, wherein the rotating shaft is rotatably arranged on the partition plate, the other end of the third connecting rod is fixedly connected with the rotating shaft, the other end of the third connecting rod is provided with the second floating ball, one end of the baffle is fixedly connected with the partition plate, the other end of the baffle is abutted to the rotating shaft and used for limiting the rotating angle of the rotating shaft, so that the second floating ball is located above the first floating ball, a cam is arranged on the rotating shaft, and the cam corresponds to the valve plate.

Further preferably, the barrel cover is arranged on the top of the barrel.

Further preferably, an overflow port is formed between the top of the partition plate and the cartridge cover.

Further preferably, the water inlet device further comprises a supporting plate, the supporting plate is horizontally arranged in the water inlet chamber and used for dividing the water inlet chamber into an upper cavity and a lower cavity, a through hole is formed in the supporting plate and communicated with the water inlet through an elbow pipe, the water inlet is located below the supporting plate, the valve plate mechanism is arranged on the supporting plate, and the water inlet is located above the supporting plate.

Further preferably, a plurality of drainage arches are arranged at the bottom of the filter cylinder, the drainage arches are arranged at intervals along the circumferential direction of the filter cylinder, and the drainage arches are the drainage outlet.

Further preferably, the water inlet device further comprises a filter screen which is arranged in the cylinder and is positioned at the water inlet.

The technical effects of the utility model reside in that:

(1) the utility model discloses a cartridge filter and intake chamber intercommunication, the initial stage rainwater that gets into the intake chamber can directly get into the cartridge filter and arrange outward to realize the rainwater that has pollutants such as silt, rubble, dust in the initial stage rainwater of autosegregation house, and can directly filter and purify, reduce the SS to the initial stage rainwater of separating, arrange municipal pipe network or the biological detention measure of ground of discharging into with collecting cleaner rainwater, comprehensive utilization rainwater resource improves the utilization ratio of water resource. Furthermore, the utility model discloses a rainwater processing apparatus is integrated multi-functional, and simple structure, and small, take up an area of fewly, and investment cost is low, and the construction is simple.

(2) The utility model discloses a rainwater processing apparatus need not power, and easy operation is particularly suitable for the room before the building after, and the afforestation is reformed transform in the district, and through the dot matrix overall arrangement, can be applied to the large tracts of land place, each independent operation, mutual noninterference, and convenient to use simplifies the pipe network overall arrangement.

(3) The utility model discloses an arrangement mode to the regional sponge city construction of special soil property, provides new construction route, and to conventional soil property region, increases the control approach of roofing rainwater, if can carry out closure control in roofing rainwater transmission process, has reduced sponge city construction and has promoted the quality of building view when satisfying the requirement of sponge city construction to the rainwater drainage system's of building with the district restriction.

Drawings

The invention will be described in further detail with reference to the following drawings and embodiments:

FIG. 1 is a front sectional view of a first embodiment of the rainwater treatment device of the present invention;

FIG. 2 is a schematic structural view of a first embodiment of the rainwater treatment device of the present invention;

FIG. 3 is a schematic view of the internal structure of a first embodiment of the rainwater treatment device of the present invention;

FIG. 4 is a schematic view of a partial structure of a first embodiment of the rainwater treatment device of the present invention;

fig. 5 is a cross-sectional view of a filter cartridge of the present invention;

fig. 6 is a schematic structural view of a second embodiment of the rainwater treatment device of the present invention;

fig. 7 is an enlarged view of a portion a in fig. 6.

The reference numbers illustrate:

1. a barrel; 101. an overflow chamber; 102. a water inlet chamber; 2. a cylinder cover; 3. a water inlet; 4. a water outlet; 5. a backflow port; 6. a partition plate; 7. a filter cartridge; 701. filtering with a screen; 702. a water inlet; 703. a water outlet; 8. a support plate; 9. a valve plate mechanism; 901. a support member; 902. a connecting rod; 9021. a first link; 9022. a second link; 903. a first floating ball; 904. a valve plate; 905. a second floating ball; 906. a third link; 907. a rotating shaft; 9071. a cam; 908. a baffle plate; 10. a filter screen cover.

Detailed Description

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

For the sake of simplicity, only the parts relevant to the present invention are schematically shown in the drawings, and they do not represent the actual structure as a product. In addition, in order to make the drawings concise and understandable, components having the same structure or function in some of the drawings are only schematically illustrated or only labeled. In this document, "one" means not only "only one" but also a case of "more than one".

It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

In this context, it is to be understood that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In addition, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not intended to indicate or imply relative importance.

Example one

A rainwater treatment device comprises a cylinder body 1, a filter cylinder 7 and a valve plate mechanism 9, wherein the cylinder body 1 is of a cylindrical structure, and the cross section of the cylinder body 1 can be circular, rectangular, polygonal and the like, as shown in figures 1 to 5. The movable joint in top of barrel 1 has cover 2, and cover 2 can be pulled down from barrel 1 to in the mechanism to 1 inside of barrel overhaul or clear up, cover 2 can be confined, also can be netted.

Be equipped with the baffle 6 of vertical setting in the barrel 1, the overflow room 101 and the intake chamber 102 that set up about the baffle 6 is separated barrel 1, is formed with the overflow mouth between the top of baffle 6 and the cover 2, and the water accessible baffle 6 top in the intake chamber 102 is in the overflow mouth gets into overflow room 101. The overflow chamber 101 is provided with delivery port 4, and the intake chamber 102 is provided with water inlet 3 and backward flow mouthful 5, and water inlet 3 is located the below of backward flow mouthful 5, and water inlet 3 can be connected with roof drain to collect the rainwater on the roofing, the water in the intake chamber 102 can be followed backward flow mouthful 5 outside the discharge barrel 1. Water discharged from the reverse flow port 5 may permeate the bioretention facilities under the rainwater garden or enter other water storage devices. Water discharged from the water outlet 4 may enter the municipal pipe network. A filter screen can be arranged at the backflow port 5.

The filter cartridge 7 is arranged in the overflow chamber 101, the water inlet 702 of the filter cartridge 7 is communicated with the water inlet chamber 102, the water inlet 702 can penetrate through the side wall of the partition plate 6, the inside of the filter cartridge 7 is communicated with the water inlet chamber 102 through the water inlet 702 penetrating through the partition plate 6, the water outlet 703 of the filter cartridge 7 is communicated with the water outlet 4, the outer wall of the filter cartridge 7 is spaced from the inner wall of the cylinder body 1, and the filter cartridge 7 is used for filtering rainwater.

Be equipped with filter screen 701 in the cartridge filter 7, the both sides of filter screen 701 are provided with the axis of rotation, and the axis of rotation is articulated with the inner wall of cartridge filter 7, through the articulated of axis of rotation and cartridge filter 7 to fix filter screen 701 in cartridge filter 7. The filter screen 701 is positioned below the water inlet 702, and the rainwater in the inlet chamber 102 enters the filter cartridge 7 from the water inlet 702 of the filter cartridge 7, is filtered and purified by the filter screen 701, and is discharged from the water outlet 703. The initial rainwater is purified and then discharged, and the surface runoff control rate and the non-point source pollution reduction rate can be improved.

Preferably, the bottom of the filter cartridge 7 is provided with a plurality of drainage arches, which are arranged at intervals along the circumferential direction of the filter cartridge 7, and the drainage arches are the drainage ports 703 of the filter cartridge 7. The water in the filter cartridge 7 is filtered by the filter screen 701 and then discharged into the overflow chamber 101 from the drainage arch, and then discharged from the water outlet 4 of the overflow chamber 101.

A valve plate mechanism 9 is provided in the inlet chamber 102 for closing the inlet 702 when the water level in the inlet chamber 102 rises and opening the inlet 702 when the water level in the inlet chamber 102 falls. The valve plate mechanism 9 comprises a support 901, a connecting rod 902, a first floating ball 903 and a valve plate 904, wherein one end of the support 901 is arranged at the bottom of the water inlet chamber 102, the connecting rod 902 is hinged with the other end of the support 901, the first floating ball 903 is arranged at one end of the connecting rod 902, the valve plate 904 is arranged at the other end of the connecting rod 902, and the valve plate 904 is matched with the water inlet 702. When the water level is low, the valve plate 904 is opened, and when the water level is high, the first floating ball 903 rises along with the water level, and the valve plate 904 descends to block the water inlet 702 through the lever principle.

Further, the connecting rod 902 includes a first connecting rod 9021 and a second connecting rod 9022, the first connecting rod 9021 is hinged to the support 901, the first floating ball 903 is disposed at one end of the first connecting rod 9021, the other end of the first connecting rod 9021 is hinged to one end of the second connecting rod 9022, and the valve plate 904 is disposed at the other end of the second connecting rod 9022. One end of the valve plate 904 is hinged to the partition 6, and the other end of the valve plate 904 corresponds to the end of the water inlet 702.

The barrel 1 is also internally provided with a filter screen 10, and the filter screen 10 is arranged at the water inlet 3. The filter screen panel 10 includes curb plate and a roof, and the curb plate is mesh structure with the roof, and the curb plate encloses with the inner wall of barrel 1 bottom, barrel 1 and establishes and form a accommodation space, and the roof lid is established on this accommodation space, and the rainwater that gets into from water inlet 3 is advanced to get into in the accommodation space of filter screen panel 10, then carries out the preliminary filtration through filter screen panel 10 and then gets into in the intake chamber 102.

The working process of the rainwater treatment device is as follows:

1. initial rainwater enters the water inlet chamber 102 of the cylinder 1 through the water inlet 3, and the rainwater entering the water inlet chamber 102 enters the filter cylinder 7 from the water inlet 702 of the filter cylinder 7, is filtered by the filter screen 701 and then is discharged from the water outlet 4 at the bottom of the cylinder 1.

2. When more and more rainwater is accumulated, the filter cartridge 7 accumulates water, the water level rises, the water level of the water inlet chamber 102 rises synchronously, when the water level rises to enable the first floating ball 903 to float, the valve plate 904 is driven to close through the connecting rod 902, the water level of the water inlet chamber 102 continues to rise, and when the water level reaches the backflow port 5, rainwater permeates biological retention facilities or other water storage devices below a garden from the backflow port 5;

3. when the water level continues to rise to be higher than the top of the partition plate 6 after the water storage amount is met, water overflows to the overflow chamber 101 from an overflow port between the partition plate 6 and the cylinder cover 2 and directly flows away from the water outlet 4, and the safety of water drainage is ensured;

4. in the later stage of rainfall, the water volume is reduced, the water level of the water inlet chamber 102 gradually falls back, when the water level falls to a certain position, the first floating ball 903 falls, the valve plate 904 is opened, water flows into the filter cylinder 7 from the water inlet 702, and is filtered by the filter screen 701 and then discharged from the water outlet 4.

Because the initial stage rainwater is dirty, so the rainwater that the initial stage got into inlet chamber 102 need firstly enter cartridge filter 7 and filter, then discharge into municipal pipe network from delivery port 4 of overflow chamber 101, when the water level in inlet chamber 102 rose to being higher than 6 tops of baffle, the water that gets into overflow chamber 101 from the overflow mouth at 6 tops of baffle is middle and later stage rainwater, so middle and later stage rainwater is cleaner can directly discharge into municipal pipe network from delivery port 4 of overflow chamber 101 through not passing through cartridge filter 7. The water discharged from the backflow port 5 can be discharged into a bioretention facility under the rainwater garden for rainwater storage and biological purification.

Furthermore, the overflow chamber 101 of the barrel 1 is also provided with a one-way water inlet 3, and the one-way water inlet 3 is used for enabling water purified by the rainwater garden to enter the overflow chamber 101 and be discharged into a municipal pipe network through the water outlet 4, so that the rainwater is recycled.

The rainwater treatment device of this embodiment is applicable in the collection and the purification treatment of building roof rainwater, and the roof rainwater can directly insert ground biological retention measure or discharge into municipal pipe network through this device, need not to adopt the outer row of roof rainwater pipe to connect absolutely, can use the interior drainage of roof rainwater. Benefits of use in different regions: 1. the sponge city in the collapsible loess area is built, so that the safe distance between the building and the sponge city facility is ensured, and the purposes of ecological construction and building safety are achieved; 2. when the building is used in a conventional area, the position selection of sponge city arrangement can be increased, the appearance of the outer facade of the building is improved, and the landscape quality is improved.

Example two

Except for the valve plate mechanism 9, the other structures of the present embodiment are the same as those of the first embodiment, and the description of the same parts is omitted here. As shown in fig. 6 and 7, the valve plate mechanism 9 of the present embodiment includes a support 901, a first floating ball 903, a second floating ball 905, a first connection rod 9021, a second connection rod 9022, a third connection rod 906, a rotation shaft 907, a baffle 908, and a valve plate 904, where the support 901 is disposed at the bottom of the cylinder 1, the first connection rod is hinged to the support 901, one end of the first connection rod 9021 is provided with the first floating ball 903, the other end of the first connection rod 9021 is hinged to one end of the second connection rod 9022, the other end of the second connection rod 9022 is hinged to one end of the valve plate 904, the other end of the valve plate 904 is hinged to the baffle 6, the rotation shaft 907 is rotatably disposed on the baffle 6, the rotation shaft 907 is disposed parallel to the baffle 6, the other end of the third connection rod 906 is fixedly connected to the rotation shaft 907, the other end of the third connection rod 906 is provided with the second floating ball 905, one end of the baffle 908 is fixedly connected to the baffle 6, the other end of the baffle 908 is abutted to the rotation shaft 907 for limiting the rotation angle of the rotation shaft 907, so that the second floating ball 905 is positioned above the first floating ball 903, preferably, the height of the second floating ball 905 corresponds to the lower line of the backflow port 5, the rotating shaft 907 is provided with a cam 9071, and the cam 9071 corresponds to the valve plate 904.

In an initial state (a falling state), the first floating ball 903 and the second floating ball 905 both fall to respective lowest positions, the baffle 908 limits the height position of the second floating ball 905, at this time, the second floating ball 905 is located above the first floating ball 903, and the valve plate 904 is in a fully open state.

In the initial rain, the water flow is very small, the liquid level in the water inlet chamber 102 is below the backflow port 5, the first floating ball 903 is completely immersed in the water, the second floating ball 905 does not act above the water surface, and the valve plate 904 is slightly opened.

When the rainwater is larger and larger, the water in the inlet chamber 102 has no time to flow into the filter cartridge 7 (or the water level of the filter cartridge 7 rises), the water level of the inlet chamber 102 rises, the first floating ball 903 starts to float, and the valve plate 904 is driven to be closed slowly. When the first float 903 floats to a certain position, the valve plate 904 touches the cam 9071 on the rotating shaft 907, and the valve plate 904 stops operating (because the second float 905 is on the water surface, the valve plate does not operate temporarily because of no buoyancy).

When the water level in the water inlet chamber 102 continues to rise and reaches the lower edge line of the backflow port 5, the second floating ball 905 slowly floats upwards, the rotating shaft 907 is driven to rotate through the third connecting rod 906, the cam 9071 on the rotating shaft 907 is gradually far away from the valve plate 904, the valve plate 904 also continues to rotate in the closing direction, and the water in the water inlet chamber 102 mainly flows out from the backflow port 5.

After the water level continues to rise and exceed the upper edge line of the backflow port 5, the second floating ball 905 floats to the highest point, the cam 9071 is completely separated from the valve plate 904 and does not block the valve plate 904 from being closed, at the moment, the valve plate 904 is completely closed, and water flows out of the backflow port 5 completely.

When the rainwater in the water inlet chamber 102 is fully stored, the water level of the water inlet chamber 102 continues to rise, and when the water level exceeds the top of the partition plate 6, the excessive rainwater flows out of the water inlet chamber 102 from the overflow port at the top of the partition plate 6, enters the overflow chamber 101, falls into the bottom of the barrel body 1, directly flows away from the water outlet 4, and ensures smooth drainage.

In this embodiment, by additionally providing the second floating ball 905, the rotating shaft 907, the cam 9071, the baffle 908 and other structures, the closing size of the valve plate 904 can be adjusted according to the water level in the water inlet chamber 102, so as to select a proper drainage path, ensure smooth drainage and optimize the drainage mode.

EXAMPLE III

The structure of the barrel 1, the filter cartridge 7, the valve plate mechanism 9, and the like in this embodiment is the same as that in the first embodiment or the second embodiment, and the same parts are not described again here, as shown in fig. 3 and fig. 6, the difference between this embodiment and the first embodiment or the second embodiment is that the rainwater treatment apparatus in this embodiment further includes a support plate 8, the support plate 8 is horizontally disposed in the water inlet chamber 102 and is used for dividing the water inlet chamber 102 into an upper cavity and a lower cavity, the valve plate mechanism 9 is disposed on the support plate 8, and the water inlet 3 is located above the support plate 8. The water inlet 702 may be disposed above or below the support plate 8, when the water inlet 702 is disposed above the support plate 8, the filter cartridge 7 may be directly communicated with the inlet chamber 102 through the water inlet 702, and when the water inlet 702 is disposed below the support plate 8, the support plate 8 may be provided with a through hole, which is communicated with the water inlet 702 through an elbow pipe, thereby achieving communication between the filter cartridge 7 and the inlet chamber 102.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (10)

1. A rainwater treatment apparatus, comprising:

the water inlet device comprises a barrel, wherein a vertically arranged partition plate is arranged in the barrel and divides the barrel into an overflow chamber and a water inlet chamber, the overflow chamber is provided with a water outlet, the water inlet chamber is provided with a water inlet and a backflow port, and the water inlet is positioned below the backflow port;

the filter cylinder is arranged in the overflow chamber, a water inlet of the filter cylinder is communicated with the water inlet chamber, a water outlet of the filter cylinder is communicated with the water outlet, a gap is reserved between the outer wall of the filter cylinder and the inner wall of the cylinder body, and the filter cylinder is used for filtering rainwater;

and the valve plate mechanism is arranged in the water inlet chamber and used for closing the water inlet when the water level of the water inlet chamber rises and opening the water inlet when the water level of the water inlet chamber falls.

2. The rainwater treatment apparatus according to claim 1, wherein said valve plate mechanism comprises a support member, a connecting rod, a first floating ball and a valve plate, said support member is disposed at the bottom of said inlet chamber, said connecting rod is hinged with said support member, said first floating ball is disposed at one end of said connecting rod, said valve plate is disposed at the other end of said connecting rod, and said valve plate is used for closing said water inlet.

3. A rainwater treatment unit according to claim 2 wherein said link includes a first link and a second link, said first link being pivotally connected to said support member, said first float being disposed at one end of said first link, the other end of said first link being pivotally connected to one end of said second link, and said valve plate being disposed at the other end of said second link.

4. A rainwater treatment unit according to claim 2 or 3 wherein one end of said valve plate is hinged to said partition and the other end of said valve plate corresponds to the end of said water inlet.

5. The rainwater processing device according to claim 4, wherein said valve plate mechanism further comprises a rotating shaft, a third connecting rod, a second floating ball and a baffle, said rotating shaft is rotatably disposed on said partition, another end of said third connecting rod is fixedly connected with said rotating shaft, another end of said third connecting rod is provided with said second floating ball, one end of said baffle is fixedly connected with said partition, another end of said baffle is abutted against said rotating shaft for limiting the rotating angle of said rotating shaft, so that said second floating ball is located above said first floating ball, said rotating shaft is provided with a cam, and said cam is disposed corresponding to said valve plate.

6. A rainwater treatment unit according to claim 1 further including a cover disposed on top of said tank.

7. A rainwater treatment unit according to claim 6 wherein an overflow is formed between the top of the baffle and the cover.

8. The rainwater treatment apparatus according to claim 1, further comprising a support plate horizontally disposed in said water inlet chamber for dividing said water inlet chamber into an upper chamber and a lower chamber, said support plate having a through hole, said through hole communicating with said water inlet through an elbow, said water inlet being located below said support plate, said valve plate mechanism being disposed on said support plate, said water inlet being located above said support plate.

9. A rainwater treatment unit according to claim 1 wherein the bottom of said filter cartridge is provided with a plurality of drainage arches spaced circumferentially around said filter cartridge, said drainage arches being said water outlets.

10. A rainwater treatment apparatus according to claim 1 further comprising a filter screen disposed within said barrel at said water inlet.

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