CN105672442A - Rainwater discarding and collecting device - Google Patents

Abstract

The invention relates to a rainwater initial waste flow and collection device, which includes a water inlet pipe, a waste flow tank, a pressure stabilizing pipe, a sewage discharge pipe, a first and a second diversion pipe, a water collection tank and a drainage pipe, and a water retaining plate is arranged in the waste flow tank , a spring, a slide rod and a control plug with a connecting rod, the tank body of the discarded flow tank is provided with the first and second diversion ports and a pressure stabilizing port, the bottom of the tank is provided with a discharge port, and the water collection tank is provided with an overflow port and a water intake port , the rainwater flows into the waste flow tank through the water inlet pipe, and under the action of the waste flow tank, the initial rainwater is discharged into the drain pipe through the sewage pipe, and the rainwater in the later stage is merged into the waste flow tank through the first and second shunt pipes In the water collection tank, when the water level in the water collection tank reaches the design high water level, the excess rainwater flows into the drain pipe through the overflow port and is discharged, so as to realize the initial abandonment and collection of rainwater. The invention can avoid the defects of the original device such as complex structure, energy consumption, high maintenance cost, and insufficient discarded flow, and can automatically operate to realize the re-abandoned flow and re-collection of multiple rainfalls.

Description

A device for discarding and collecting rainwater

technical field

The invention relates to the technical field of rainwater collection and utilization, in particular to a rainwater initial waste flow and collection device.

Background technique

With the continuous shortage of fresh water resources in the world, the collection and utilization of rainwater has been widely concerned. In some cities and regions where fresh water resources are scarce, various technologies, equipment and measures have been adopted for rainwater collection and utilization. However, due to the high concentration of pollutants and poor water quality conditions in the initial rainwater, it often does not meet the requirements of rainwater collection and utilization. Therefore, it is an important aspect of rainwater utilization to adopt a reasonable way to initially discard the rainwater. The rainwater initial abandonment device in the prior art usually uses structures such as solenoid valves and floating balls to realize the initial rainwater abandonment. The structure is complex, energy consumption is high, maintenance costs are high, and special personnel are required for management. Therefore, in order to ensure the optimal quality and cost of accumulated water, and to achieve sustainable promotion and application, it is an urgent technical problem to design a standardized, lightweight and automated rainwater initial discharge and collection device.

Contents of the invention

Aiming at the problems of complex operation, poor economy and poor reliability in the prior art, the present invention provides a rainwater initial waste flow and collection device with simple structure, no electricity consumption, good effect and convenient maintenance and repair.

The technical solution to achieve the above purpose is as follows: a rainwater waste flow and collection device, including a water inlet pipe, a waste flow tank, and a sewage pipe. Forming a drain opening, characterized in that: a lifting device is provided inside the drain tank, and a permeable hole for liquid to flow down is set on the lifting device, and the liquid is discharged into the sewage pipe through the permeable hole, and the flow rate of the liquid flowing into the drain tank is greater than that discharged from the permeable hole For liquid flow, a control plug is installed at the bottom of the lifting device. The size of the control plug is adapted to the size of the discharge port. The lifting device can move up and down in the waste tank. When the liquid on the lifting device is heavier than the lifting device When the strength is constant, the control plug gradually blocks the discharge port, so that the water no longer flows into the sewage pipe, and the control plug is used to control the sealing and opening of the discharge port;

The first shunt pipe is arranged on the outside of the waste water tank near the bottom of the waste water tank. The free end of the first water flow pipe is connected to the storage tank. When the lifting device blocks the inlet of the sewage pipe, the liquid in the waste water tank passes through the first A shunt tube discharges into the sump tank.

The working method of the rainwater abandonment flow and collection device is characterized in that:

(1) Initial rainwater abandonment stage:

After the rainfall begins, the rainwater flows into the water inlet pipe, and the rainwater in the water inlet pipe flows into the waste water tank, and then the initial rainwater flows into the sewage pipe through the permeable hole on the lifting device and is continuously discharged; because the rainwater flow into the waste water tank is greater than the rainwater discharged from the water hole As the rainfall continues, the amount of rainwater on the lifting device will increase in a short time, causing the water level in the jettison tank to rise slowly. Under the action of the water body's own weight, the lifting device will slowly move down, causing the control plug to gradually Blocking the discharge outlet, when the discharge outlet is completely blocked by the control plug 8, the initial rainwater is just drained, so as to realize the initial rainwater abandonment;

(2) Rainwater collection stage:

When the control plug completely blocks the jet outlet, the permeable hole continues to permeate downwards, resulting in accumulated water at the bottom of the jettison tank. With the increase of the accumulated water, the liquid level gradually rises to the position of the nozzle of the first shunt pipe, so that the second The first shunt pipe begins to flow out rainwater; at the same time, as the rainfall continues, the water level above the lifting device gradually rises to the position of the second shunt pipe nozzle, and the second shunt pipe begins to flow out rainwater; the accumulated water is accompanied by the first shunt pipe, the second shunt pipe The two shunt pipes merge into the water storage tank; when the accumulated water in the water storage tank reaches the position of the overflow port, the excess water flows into the drain pipe through the overflow port to be drained away;

(3) The automatic reset stage of the device:

After the rainfall ends, as the flow rate of the water inlet pipe gradually decreases, the water level in the jettison tank begins to drop slowly due to the accumulation of water in the first shunt pipe, causing the weight of the water body above the lifting device to gradually decrease; when the water body above the lifting device When the self-weight is less than the elastic force of the spring and the friction force between the water baffle and the inner wall of the jettison tank, the lifting device will drive the control plug to move up gradually, so that the jettison port will be opened, and the remaining water in the jettison tank will be emptied, and finally the device will be realized. Automatic reset.

The initial rainwater enters the waste flow tank through the interception net and is drained through the permeable holes on the water baffle; the later rainwater compresses the miniature compression spring under the action of its own weight, so that the rod on the baffle The control plug blocks the jet outlet, and the later clean water enters the water storage tank through the first shunt pipe and the second shunt pipe respectively.

After the rainfall stops, the rainwater in the waste flow tank slowly flows down through the permeable holes on the water retaining plate, and at the same time, the water retaining plate moves upwards gradually under the action of the miniature compression spring force, so that the control bar with the rod The plug opens the drain opening, thereby draining the remaining rainwater in the drain tank, and finally the water baffle resets.

As an available water resource, the rainwater treated by the invention can be used to meet the water quality standard of reclaimed water. The device can be applied to rainwater collection and utilization on building roofs, and can also be expanded to rainwater recovery and utilization in local areas. The utility model has the advantages of simple structure, energy saving, environmental protection, economy and applicability, good effect and convenient popularization and application.

Description of drawings

Fig. 1 is the overall schematic diagram of the present invention

Figure 2 is a partial enlarged view of the lifting device in Figure 1

Description of the accompanying drawings serial number: interception net 1, water inlet pipe 2, buffer joint 3, waste flow tank 4, water permeable hole 5, voltage stabilizing pipe 6, miniature small compression spring 7, control plug 8, sewage pipe 9, drainage pipe 10, the first Second diversion pipe 11, water retaining plate 12, first diversion pipe 13, slide rod 14, overflow port 15, water storage tank 16, water intake 17, drain outlet 18, diversion pipe 19, inclined pipe 20, boss twenty one

detailed description

The present invention will be described in detail below in conjunction with the accompanying drawings.

In Fig. 1, the rainwater waste flow and collection device includes a water inlet pipe 2, a waste flow tank 4, and a sewage discharge pipe 9. The junction forms a drain opening, preferably a buffer joint 3 is provided between the drain tank 4 and the water inlet pipe 2, one end of the buffer joint 3 is connected to the bottom of the water inlet pipe 2, and the other end is connected to the top of the drain tank 4, and the buffer The joint 3 is obliquely placed between the waste flow tank and the water inlet pipe, the water inlet pipe 2 is parallel to the waste flow tank 4, and an angle of 45° is formed between the buffer joint and the horizontal plane, and the water in the water inlet pipe 2 enters the waste flow through the buffer joint 3 In the tank 4, the outlet for discarding the flow is connected to the sewage pipe 9 for the initial abandonment of the rainwater. The free end of the sewage pipe 9 is connected to the drainpipe 10, and the water coming out of the sewage pipe 9 is discharged through the drainpipe 10. Of course, the water coming out of the sewage pipe 9 can also be directly discharged.

An interception net 1 is set on the nozzle of the water inlet pipe 2, and the interception net 1 is placed obliquely so that the interception net 1 and the horizontal plane are at an angle of 20°. High-efficiency filtration with particulate matter and impurities to ensure that debris below 2mm can slide freely. The setting of the interception net solves the problems of jamming and blocking the internal structure of the waste flow tank by impurities in the initial waste flow rainwater, and realizes reliable waste flow.

A lifting device is arranged inside the discarding flow tank 4, and several permeable holes through which water flows down are arranged on the lifting device, and the water is discharged into the sewage pipe 9 through the permeable holes, and a control plug 8 is installed at the bottom of the lifting device, and the size of the control plug 8 is related to that of the waste flow. The size of the mouth is adapted, and the lifting device can move up and down in the waste flow tank 4. When the self-weight of the water on the lifting device is greater than the force when the lifting device falls, the control plug 8 gradually blocks the waste flow port, so that the water No longer flowing into the blowdown pipe 9, the control plug is used to control the plugging and opening of the jettison outlet.

The lifting device includes a water retaining plate 12 and several sliding rods 14. The outer edge of the water retaining plate 12 is adapted to the inner wall of the jettison tank. Position, several symmetrical jacks are also set on the water baffle 12, and the slide bar 14 is inserted into the socket, the water baffle 12 can move up and down along the slide bar 14, and each of the water baffles at the bottom Spring 7 is sleeved on the root slide bar, and the upper end of spring 7 is pushed against the bottom surface of water retaining plate 12, and spring 7 is preferably miniature stage clip, and slide bar is preferably three among the present invention, and mutually forms 120 ° between three slide bars A connecting rod is installed in the middle of the water retaining plate 12, and a control plug 8 is installed at the bottom end of the connecting rod; a boss 21 is provided at the bottom of the waste flow tank 4, and when the elevating device moves downward, the bottom of the water retaining plate 12 The free end of the slide bar 14 on the edge can abut on the boss 21, and the position of the boss 21 provides a supporting point for the slide bar; When the frictional force between the tanks 4 and the spring give the sum of the resilience of the water retaining plate 12, the water retaining plate 12 slowly slides until the control plug 8 blocks the inlet of the waste pipe 9, so that water no longer enters the waste pipe 9. The height and stiffness coefficient of the miniature compression spring are determined by the volume of the jettison tank and the flow rate. The surface of the miniature compression spring is coated with antirust paint, and the total area of the permeable holes on the water retaining plate 12 is less than or equal to the water inlet pipe 0.5 times the caliber area. The water retaining plate drives the control plug to block the drain outlet by compressing the spring sleeved on the vertical slide rod. The bottom end of the slide bar of the lifting device can be pushed against the boss 21 in advance during the assembly process, or it can be slightly away from the boss 21 at a certain distance. In the present invention, the bottom end of the slide bar is preferably pushed against the boss 21 in advance. .

The control plug 8 is made of butyl rubber, and has a conical structure with a large upper part and a smaller lower part. The length of the connecting rod connected to the control plug 8 is determined by the water baffle 12 moving down to the waste tank under the action of the water body's own weight. The height between the positions of the jettison is determined, that is, the water baffle 12 begins to move down to the state where the spring is fully compressed under the action of the water body’s own weight, and the connecting rod can drive the control plug to just move the position of the jettison when this state ends. Complete plugging, if the connecting rod is too long, the discharge port will be blocked prematurely when the spring is not fully compressed, and if the connecting rod is too short, the spring will still not be able to seal it when the spring is fully compressed Discard the spout.

Close to the bottom position of the jettison tank 4, the first shunt pipe 13 is arranged on the outside of the jettison tank 4, and the free end of the first shunt pipe 13 can directly communicate with the water storage tank 16, or it can be connected between the first shunt pipe 13 and the water storage tank. A shunt pipe 19 is arranged between 16, and the shunt pipe 19 communicates with the first shunt pipe 13 and the water storage tank 16 respectively. When the control plug 8 blocks the outlet of the sewage pipe 9, the water in the waste flow tank 4 passes through the first shunt pipe 13 is discharged in the accumulated water tank 16. The volume of water storage tank 16 is determined by the roof area and the depth of abandonment.

A second shunt pipe 11 is also arranged on the outer side upper part of the jettison tank, and the free end of the second shunt pipe 11 can directly communicate with the storage tank 16, or the free end of the second shunt pipe 11 also directly communicates with the shunt pipe 19, and the first shunt pipe All the water with the second shunt pipe 11 flows into the shunt pipe 19 , and then enters into the water storage tank 16 through the shunt pipe 19 .

The height of the second shunt pipe 11 is higher than the height of the first shunt pipe 13, and when the water depth in the jettison tank 4 was higher than the second shunt pipe 11, the water in the jettison tank 4 passed through the first shunt pipe 13 and the second shunt pipe 13. The two shunt pipes 11 are jointly discharged into the accumulated water tank. The water passing capacity of the first branch pipe is greater than the water passing capacity of the permeable hole on the water retaining plate, and the water passing capacity of the first branch pipe is smaller than the water passing capacity of the second branch pipe.

The upper left part of the water tank 16 is provided with an overflow port 15, the overflow port 15 is externally connected to the inclined pipe 20, and the other end of the inclined pipe 20 is directly connected to the drain pipe 10, and the water from the sewage pipe 9 and the water tank 16 flows into the drain together The pipe 10 is drained away, and the inclined pipe 20 can reduce the impact of the water flow on the drain pipe 10 and prevent backflow. The position of the overflow port 15 on the side of the water tank 16 is the preset water level, that is, when the water in the water tank 16 exceeds the preset water level, the excess water can be discharged from the overflow port 15 along the inclined pipe 20 .

The outlet tank 4 is also provided with a regulator tube connection port, which is externally connected to the regulator tube 6, and the height of the regulator tube connection port is less than or equal to the height when the spring is compressed to the limit, and the regulator tube 6 is used to maintain the discarded flow. The constant pressure of the water in the tank.

In the present invention, attention should be paid to the matching of the inner diameter of the socket on the water retaining plate 12 and the outer diameter of the slide bar 14. Since the water retaining plate 12 needs to slide down along the slide bar, the water retaining plate 12 compresses the spring on the slide bar. , and at the same time, the water baffle 12 also drives the control plug 8 to press to the discharge outlet, so the cooperation between the jack and the slide bar 14 cannot adopt a static fit, so as to avoid that the water baffle cannot slide along the slide bar 14, and at the same time, the connection between the jack and the slide bar The gap should not be too large, so as to prevent the water baffle from sliding down the slide bar under a slight force. The gap between the socket and the slide bar is preferably between 0.01-0.005. As long as the spring is fully compressed, the water baffle will no longer slide along the slide bar. Slider down.

In the present invention, the integrated structure of the water retaining plate, the connecting rod and the control plug is preferred.

The process of collecting rainwater and its discharge by the waste flow and collection device can be divided into three stages:

(1) Device installation preparation stage: According to the multi-year rainfall data in the area of use, estimate and determine the total amount of initial rainwater discarded flow and the corresponding designed rainwater flow rate, and determine the diameter of the inlet pipe 2 and the size of the discarded flow tank 4 , the number of permeable holes 5 on the water retaining plate 12, the specifications of the miniature stage clip 7 and the length of the slide bar 14, and the length of the connecting rod, the control plug 8, the volume design of the water tank 16 and other elements. Each element needs to be determined according to the local actual situation, and the setting of parameters only needs to be able to accomplish the purpose of the present invention.

The selection of miniature compression spring specifications should meet the requirement that the control plug 8 can automatically block and open the jettison outlet under the action of the rainwater’s own weight; The water passing capacity of the water inlet pipe 2 (and the water passing capacity of the first branch pipe 13 should be greater than the water passing capacity of the permeable port 5 on the water retaining plate 12, and the water passing capacity of the first branch pipe 13 is less than that of the second branch pipe 11 water flow capacity); the outlet flow of shunt pipe 19 should be consistent with the inlet flow of overflow port 15, and the water flow capacity of drain pipe 10 should be greater than the total water flow capacity of inclined pipe 20 and blowdown pipe 9; The design volume can accommodate enough rainfall and clean water to meet the full and efficient use of precipitation resources.

(2) Initial rainwater abandonment stage: After the rainfall begins, the rainwater flows into the water inlet pipe 2 after passing through the interception net 1, and the rainwater in the water inlet pipe 2 flows into the waste flow tank 4 under the action of the buffer joint 3, and the initial rainwater passes through the water retaining plate The permeable hole 5 on the 12 flows into the sewage pipe 9 and discharges continuously; because the flow of rainwater flowing into the waste flow tank 4 is greater than the flow discharged from the permeable hole 5, as the rainfall continues, the amount of rainwater on the water retaining plate 12 will be reduced in a short time. increase, so that the water level in the jettison tank 4 rises slowly, under the action of the water body's own weight, the water retaining plate 12 slowly compresses the miniature compression spring along the slide rod 14, causing the control plug 8 to gradually block the jettison port 18, when the When the drain opening 18 is completely blocked by the control plug 8 with the connecting rod, the initial rainwater is just drained, thereby realizing the initial rainwater abandonment flow.

(3) Rainwater collection stage: after the control plug 8 with the connecting rod completely blocks the drain outlet, the permeable hole 5 on the water retaining plate 12 continues to permeate downwards, causing water to accumulate at the bottom of the drain tank 4. As the amount increases, the liquid level gradually rises to the water level at the mouth of the first branch pipe 13, so that water begins to accumulate through the first branch pipe 13, and finally rainwater flows out from the first branch pipe 13; at the same time, as the rainfall continues, the water barrier The accumulated water level above 12 gradually rises to the nozzle water level of the second branch pipe 11, and the accumulated water begins to accumulate through the second branch pipe 11; Then flow into the accumulated water tank 16; when the accumulated water in the accumulated water tank 16 reaches the design accumulated water amount (the horizontal line at the overflow port 15 position is the designed accumulated water amount), the excess water flows into the inclined pipe through the overflow port 15 20, and finally flow into the drain pipe 10 together with the initial rainwater in the sewage pipe 9 to be drained away.

(4) The automatic reset stage of the device: after the rainfall ends, as the flow rate of the inlet pipe 2 gradually decreases, the water level in the jettison tank 4 begins to drop slowly due to the accumulation of water in the first shunt pipe 13, causing the water retaining The self-weight of the water body above the plate 12 is gradually reduced; when the self-weight of the water body above the water retaining plate 12 is less than the elastic force of the miniature compression spring and the friction between the water retaining plate 12 and the inner wall of the jettison tank 4, under the action of the elastic force of the miniature compression spring , the water retaining plate 12 drives the control plug 8 to move upwards gradually, thereby opening the jet outlet 18, emptying the remaining water in the jet dump tank 4, and finally realizing the automatic reset of the device.

In summary, the present invention can automatically discard the initial rainwater that is not suitable for direct use through the simplified waste flow tank device in the early stage of rainfall, and collect and utilize the rainwater in the middle and late stages after the initial rainwater flow is completed, and the rain is over The rear device automatically resets, and can automatically prepare for the initial rainwater abandonment for the next rainwater collection. The invention does not require manual work, has a high degree of automation, and has a good effect of abandonment, and has the advantages of simple structure, no power consumption, and low cost. .

The above are only preferred embodiments of the embodiments of the present invention, and are not intended to limit the embodiments of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the embodiments of the present invention shall include Within the protection scope of the embodiments of the present invention.

Claims (10)

1. a rain water drainage and collection device, including water inlet pipe, abandoned stream tank, blow-off pipe, the two ends of abandoned stream tank are respectively communicated with water inlet pipe and blow-off pipe, blow-off pipe forms abandoned stream mouth with abandoned stream tank junction, it is characterized in that: abandoned stream tank is internally provided with lowering or hoisting gear, lowering or hoisting gear arranges the permeable hole that liquid flows down, initial stage liquid enters blow-off pipe by permeable hole, wherein flow into the fluid flow that the fluid flow of abandoned stream tank is discharged more than permeable hole, the bottom of lowering or hoisting gear is installed and is controlled plug, control size and the abandoned stream mouth size fit of plug, lowering or hoisting gear can in abandoned stream tank on, lower movement, when the liquid being positioned on lowering or hoisting gear conducts oneself with dignity dynamics when falling more than lowering or hoisting gear, control plug and block abandoned stream mouth gradually, water is made to be no longer flow in blow-off pipe, control plug for controlling closure and the unlatching of abandoned stream mouth,

Near abandoned stream pot bottom position, at arranged outside first isocon of abandoned stream tank, the free end connection water tank of the first isocon, when the water inlet of the clogging blow-off pipe of lowering or hoisting gear, the liquid in abandoned stream tank enters water tank by the first isocon.

2. rain water drainage according to claim 1 and collection device, it is characterized in that: described lowering or hoisting gear includes water fender, several slide bar, the outer rim of water fender is adaptive with the inwall of abandoned stream tank, permeable hole is positioned on the end face of water fender, simultaneously near water fender marginal position, also setting up the jack of several symmetry on water fender, what slide bar was adaptive is inserted in jack, water fender can move up and down along slide bar, and is positioned at the spring being socketed same type on every slide bar bottom water fender;

Wherein a connecting rod is installed at the middle part of water fender, and connecting rod bottom is installed and controlled plug, and requires that controlling plug matches with abandoned stream mouth;

The tank bottoms end of described abandoned stream has a boss, and when lowering or hoisting gear moves down, the slide bar free end of water fender bottom margin can be connected on boss, and the position of boss is supplied to one strong point of slide bar;

When the liquid on water fender conducts oneself with dignity the resilience force sum giving water fender more than the frictional force between water fender and abandoned stream tank and spring, the slow landing of water fender, until controlling plug to block the import of blow-off pipe, make liquid not enter back into blow-off pipe.

3. rain water drainage according to claim 2 and collection device, it is characterized in that: the outside of abandoned stream tank also sets up the second isocon, the height of the second isocon is higher than the height of the first isocon, when the liquid height in abandoned stream tank is higher than the second isocon, the liquid in abandoned stream tank is entered in water tank by the first isocon and the second isocon.

4. according to the rain water drainage described in claim 3 and collection device, it is characterised in that: the spring being cased with on vertical slide bar belongs to miniature tiny stage clip.

5. rain water drainage according to claim 4 and collection device, it is characterised in that: wherein the first isocon, the second isocon are communicated with isocon jointly, the free end connection water tank of isocon;

Water tank side lower is provided with overfall, and the lower end of blow-off pipe is provided with drain pipe, is connected oblique pipe, blow-off pipe and water tank water out and is co-flowed into drain pipe and drains between drain pipe with overfall.

6. rain water drainage according to claim 1 and collection device, it is characterized in that: between abandoned stream tank and water inlet pipe, flexible coupling is set, liquid in water inlet pipe enters in abandoned stream tank by flexible coupling, wherein one end of flexible coupling is connected to the bottom of water inlet pipe, the other end is connected to the top of abandoned stream tank, and flexible coupling is tilting between abandoned stream tank and water inlet pipe.

7. rain water drainage according to claim 1 and collection device, it is characterized in that: the top of water inlet pipe is installed and intercepted net, described interception net is provided with eight order grids, intercepts the angle that net is horizontal by 20 °, it is ensured that below the 2mm foreign material of filtration can free landing; The bottom of water tank arranges switch, and the water in on-off control water tank flows out.

8. rain water drainage according to claim 2 and collection device, it is characterized in that: abandoned stream tank also sets up stabilivolt connector, stabilivolt connector external connection stabilivolt, the height when height≤spring of stabilivolt connector is by limited compression, stabilivolt is used for keeping constant voltage.

9. rain water drainage according to claim 5 and collection device, it is characterized in that: wherein the discharge capacity of the first isocon is more than the discharge capacity of permeable hole on water fender, the discharge capacity of the first isocon is less than the discharge capacity of the second isocon simultaneously, on described water fender 0.5 times of the gross area of permeable hole≤described water inlet pipe aperture area, the rate of discharge of isocon is consistent with the inlet flow rate of overfall.

10. the method for work of rain water drainage and collection device, it is characterised in that:

(1) the early-stage rainwater stream abandoning stage:

After rainfall starts, rainwater flows into water inlet pipe, and the rainwater in water inlet pipe flows into abandoned stream tank, and early-stage rainwater is constantly discharged through the permeable hole inflow blow-off pipe on lowering or hoisting gear afterwards; The rainwater flow that rainwater flow owing to flowing into abandoned stream tank is discharged more than permeable hole, along with constantly carrying out of rainfall, it is positioned at the amount of rainfall on lowering or hoisting gear can increase at short notice, making water level in abandoned stream tank slowly increase, under the effect of water body deadweight, lowering or hoisting gear slowly moves down, cause control plug closure abandoned stream mouth gradually, when abandoned stream mouth is controlled plug 8 closure completely, early-stage rainwater is drained just, thus realizing rain early-stage split-flow;

(2) the rainwater-collecting stage:

After controlling plug closure abandoned stream mouth completely, permeable hole continues permeable downwards, causes abandoned stream pot bottom hydrops occur, and along with increasing of water accumulating volume, liquid level gradually rises up to the first isocon nozzle position, thus the first isocon begins to flow out rainwater; Proceeding along with rainfall simultaneously, water accumulation level more than lowering or hoisting gear gradually rises up to the second isocon nozzle position, and the second isocon begins to flow out rainwater; Hydrops imports in water tank in company with the first isocon, the second isocon; When the water accumulating volume in water tank arrives overfall position, the unnecessary water yield flows into blow-off pipe by overfall and drains;

(3) device automatically resets the stage:

After rainfall terminates, along with flowing into gradually decreasing of water inlet pipe flow, the water level in abandoned stream tank is due to the hydrops effect of the first isocon, and water level starts slow decline, causes the above water body deadweight of lowering or hoisting gear to alleviate gradually;When the above water body deadweight of lowering or hoisting gear is less than the frictional force between elastic force and water fender and the abandoned stream top tank structure of spring, lowering or hoisting gear drives and controls to fill in upper gradually shifting, so that abandoned stream mouth is opened, and the surplus water in emptying abandoned stream tank, finally realize device and automatically reset.