CN112832359A

CN112832359A - Decentralized regulation and storage pool suitable for drainage system upgrading and use method thereof

Info

Publication number: CN112832359A
Application number: CN202110198669.6A
Authority: CN
Inventors: 时珍宝; 黄俊杰
Original assignee: Shanghai Bibo Water Design Research And Development Center
Current assignee: Shanghai Bibo Water Design Research And Development Center
Priority date: 2021-02-22
Filing date: 2021-02-22
Publication date: 2021-05-25

Abstract

The invention discloses a dispersion regulation and storage tank suitable for a drainage system to carry a standard and a using method thereof. Has the advantages that: according to the invention, the position height of the start-stop assembly is adjusted by the way that the movable seat slides vertically along the sliding groove and is respectively clamped into the limit holes with different heights for locking, so that the position height of the overflow is quickly adjusted according to the actual precipitation flow, and the situations that the overflow of the storage tank is not timely due to overlarge precipitation flow and the water storage amount cannot reach the expected target due to undersize precipitation flow are prevented.

Description

Decentralized regulation and storage pool suitable for drainage system upgrading and use method thereof

Technical Field

The invention relates to the field of storage tanks, in particular to a dispersive storage tank suitable for drainage system upgrading and a using method thereof.

Background

The rainwater regulation and storage tank is a rainwater collection facility, and is mainly used for temporarily storing the peak flow of rainwater runoff, and slowly discharging rainwater from the regulation and storage tank after the maximum flow is reduced. Reach and to avoid the rainwater flood peak, improve rainwater utilization ratio, can control the pollution of initial stage rainwater to receiving the water again, can also play positive effect to the drainage scheduling of drainage inter-zone, but present regulation pond can't come to carry out timely adjustment to the overflow water level according to the rainfall flow of reality when setting up, if the overflow water level sets up too high, then easily appear because the rainfall flow is too big and the untimely condition of regulation pond overflow, if the overflow water level sets up too low, then easily because the rainfall flow undersize the circumstances that the water retention volume can not reach the anticipated target appears.

Disclosure of Invention

The invention aims to solve the problems and provide a dispersive storage tank suitable for the drainage system to lift targets and a using method thereof, wherein the position height of a start-stop assembly is adjusted by vertically sliding a movable seat along a sliding groove and respectively clamping the movable seat into limit holes with different heights for locking, so that the position height of overflow is quickly adjusted according to actual precipitation flow, and the situations that the storage tank overflows untimely due to overlarge precipitation flow and the storage tank cannot reach an expected target due to undersize precipitation flow are prevented, and the description is provided below.

In order to achieve the purpose, the invention provides the following technical scheme:

the invention provides a dispersed storage tank suitable for a drainage system to carry a standard, which comprises a storage tank body, wherein the storage tank body is embedded underground, the top surface of the storage tank body is open and is level to the ground, the upper part of one side of the storage tank body is communicated with a sewer for draining rainwater, the lower part of the other side of the storage tank body is communicated with a drainage assembly, and the drainage assembly is partially fixed on the ground;

the regulation pond body be close to drainage component's inner wall upper portion is fixed with the curb plate, the spout has vertically been seted up along the outside of curb plate, the outside of spout is opened, a plurality of spacing holes along horizontal setting are all seted up to the inboard of spout, and a plurality of spacing vertical coincidence in hole, vertical sliding fit has adjusting part in the spout, just adjusting part and top spacing horizontal sliding fit in hole, adjusting part's the vertical opening that is used for controlling drainage component operating condition that is fixed with in outside lower part stops the subassembly.

Preferably, the drainage assembly comprises a water pump and a lifting pipe, the water pump is fixedly installed on the ground outside the top of the storage tank body, the lifting pipe is vertically and fixedly communicated with the bottom surface of the water pump, the bottom end of the lifting pipe is horizontally and fixedly communicated with a water outlet pipe through an elbow, the water outlet pipe is communicated with the lower portion of the storage tank body, and a drainage pipe is fixedly communicated with the outer side of the water pump.

Preferably, the sliding groove is one of a dovetail groove or an I-shaped groove with a small outer part and a large inner part.

Preferably, the number of the limiting holes is three, and the limiting holes are uniformly distributed in the vertical direction.

Preferably, the adjusting assembly includes a moving seat and a limiting rod, the moving seat is in vertical sliding fit with the sliding groove, an installation groove is transversely formed in the inner side of the upper portion of the moving seat, the installation groove is coaxial with the corresponding limiting hole, the limiting rod is coaxially arranged in the installation groove, the inner end of the limiting rod is in horizontal sliding fit with the uppermost limiting hole, the outer end of the limiting rod extends out of the moving seat in a sliding fit manner, a pressure spring is in partial clearance fit in the installation groove, the end portion, away from the limiting hole, of the pressure spring is fixedly connected with the installation groove, a collar is fixed at the end portion, close to the limiting hole, of the pressure spring, and the collar is coaxially fixed with the limiting rod.

Preferably, the lantern ring is in sliding fit with the mounting groove, and the lantern ring is in interference fit with the limiting rod.

Preferably, a handle is fixed at the outer end of the limiting rod, and anti-skid grains are formed in the surface of the handle.

As preferred, open and stop the subassembly including storage box, limit switch and mounting panel, storage box upper and lower opening and vertical fixing remove the outside lower part of seat, limit switch passes through the mounting bracket to be fixed storage box's interior upper portion, just limit switch with the water pump electricity is connected, the mounting panel level is fixed storage box's inner wall middle part, the vertical sliding fit in mounting panel middle part has the guide arm, the top of guide arm is fixed with and is used for triggering limit switch's switch seat, just the switch seat with limit switch compares from top to bottom, the bottom of guide arm is fixed with the floater through the adapter sleeve, the guide arm is located the mounting panel with partial clearance fit between the adapter sleeve has the spring, just the spring both ends respectively with the mounting panel with adapter sleeve fixed connection.

Preferably, the floating ball is a hollow plastic ball, and the connecting sleeve is connected with the guide rod through threads.

The application method of the dispersion regulation and storage tank suitable for the drainage system upgrading comprises the following steps:

when the rainwater storage tank is used, rainwater flows into the storage tank body through the sewer, so that the peak flow of rainwater runoff is temporarily reserved in the storage tank body, the rainwater is slowly discharged from the storage tank body after the maximum flow of the rainwater is reduced, the peak of rainwater can be avoided, the utilization rate of the rainwater can be improved, the pollution of initial rainwater to a received water body can be controlled, and the positive effect on drainage scheduling between drainage areas can be achieved, in the using process, the water level in the storage tank body can be increased along with the discharge of the rainwater, when the water level is increased to be in contact with the floating ball, the floating ball is driven to rise in the process of continuously rising, the floating ball drives the switch seat to rise in a mode that the spring is compressed by the guide rod to trigger the limit switch, and the limit switch enables the water pump to be started to lift the rainwater in the storage tank and then to be discharged to the outside through the drainage pipe after the lifting pipe, therefore, rainwater reaching the overflow height in the storage tank body is timely discharged, the storage tank body is prevented from being blocked, when the rainwater flow is weakened to cause the water level to fall, the spring releases the compression state of the spring to enable the floating ball to contact the falling water level in real time until the floating ball returns to the initial position and the switch seat leaves the limit switch, the limit switch immediately stops triggering to enable the water pump to stop working, in the using process, when the rainwater flow is too large, the position height of the floating ball needs to be adjusted to fall to enable the storage tank body to start overflow in advance, and the operation mode is as follows: the handle is held to be pulled outwards, the limiting rod is enabled to be separated from the corresponding limiting hole in a mode of compressing the pressure spring through the lantern ring, then the outward pulling state of the limiting rod is kept, the moving seat is driven to descend along the sliding groove, in the process, the floating ball can descend along with the moving seat, as the number of the limiting holes in the sliding groove is three, when the moving seat descends until the limiting rod is close to the limiting hole at the lowest part, the handle is loosened, the pressure spring releases the compression state to drive the limiting rod to abut against the inner wall of the sliding groove, then the floating ball continues to slide downwards for a certain distance, when the limiting rod is opposite to the limiting hole, the pressure spring continues to release the compression state to drive the limiting rod to be inserted into the corresponding limiting hole, so that the position height of the descending floating ball is locked, and the water pump is triggered to drain in advance when the rainwater flow is overlarge, when the rainwater flow is too small, the floating ball is adjusted to rise to the position where the limiting rod is clamped into the limiting hole at the highest position according to the mode, so that the floating ball triggers the water pump to drain water later, sufficient water is accumulated in the storage adjusting pool body, the position height of overflow is quickly adjusted according to the actual rainfall flow, and the situations that the overflow of the storage adjusting pool body is not timely due to the fact that the rainfall flow is too large and the stored water cannot reach the expected target due to the fact that the rainfall flow is too small are prevented.

Has the advantages that: 1. the position height of the start-stop assembly is adjusted in a mode that the movable seat slides vertically along the sliding groove and is respectively clamped into the limiting holes with different heights for locking, so that the position height of the overflow is quickly adjusted according to the actual precipitation flow, and the situations that the overflow of the storage tank is not timely due to overlarge precipitation flow and the water storage amount cannot reach the expected target due to undersize precipitation flow are prevented;

2. the water level rises to the contact floating ball in the storage tank, and then the floating ball is driven to rise through buoyancy, so that the switch base is contacted with the trigger limit switch, and therefore the limit switch automatically starts the drainage assembly to work, so that rainwater exceeding the overflow water level in the storage tank is drained, and the automatic overflow effect is realized.

Drawings

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 the drawings without creative efforts.

FIG. 1 is a front cross-sectional view of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 in accordance with the present invention;

FIG. 3 is a left side cross-sectional view of FIG. 1 of the present invention;

fig. 4 is a top external view of fig. 1 of the present invention.

The reference numerals are explained below:

1. a sewer; 2. a regulation and storage tank body; 3. a drainage assembly; 301. a drain pipe; 302. a water pump; 303. a riser tube; 304. a water outlet pipe; 4. an adjustment assembly; 401. mounting grooves; 402. a collar; 403. a movable seat; 404. a limiting rod; 405. a handle; 406. a pressure spring; 5. a storage box body; 6. a start-stop assembly; 601. a limit switch; 602. a switch base; 603. mounting a plate; 604. a guide bar; 605. a spring; 606. connecting sleeves; 607. a floating ball; 608. a mounting frame; 7. a side plate; 701. a limiting hole; 702. a chute.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.

Referring to fig. 1 to 4, the invention provides a dispersion storage tank suitable for a drainage system to carry a standard, which comprises a storage tank body 2, wherein the storage tank body 2 is embedded underground, the top surface of the storage tank body 2 is open and is level to the ground, the upper part of one side of the storage tank body 2 is communicated with a sewer 1 for draining rainwater, the lower part of the other side of the storage tank body 2 is communicated with a drainage assembly 3, and part of the drainage assembly 3 is fixed on the ground. The inner wall upper portion that is close to drainage subassembly 3 of regulation pond body 2 is fixed with curb plate 7, spout 702 has vertically been seted up along the outside of curb plate 7, the outside of spout 702 is opened, a plurality of spacing holes 701 along horizontal setting have all been seted up to the inboard of spout 702, and the vertical coincidence of a plurality of spacing holes 701, vertical sliding fit has adjusting part 4 in the spout 702, and adjusting part 4 and the spacing hole 701 horizontal sliding fit of top, the vertical opening that is used for controlling drainage subassembly 3 operating condition that is fixed with in the outside lower part of adjusting part 4 stops subassembly 6.

As the preferred scheme of this case, drainage component 3 includes water pump 302 and riser 303, water pump 302 fixed mounting is on the ground in the regulation pond body 2 top outside, the vertical fixed intercommunication in water pump 302 bottom surface has riser 303, the bottom of riser 303 is through the fixed intercommunication of elbow level has outlet pipe 304, and outlet pipe 304 and the lower part intercommunication of regulation pond body 2, the fixed intercommunication in outside of water pump 302 has drain pipe 301, so set up, be convenient for promote the rainwater of regulation pond body 2 through the mode of water pump 302 work after drain pipe 301 discharges, spout 702 is one of little big dovetail groove or I-shaped groove in the outside, so set up, be convenient for remove to smooth and easy go up and down but can not the level deviate from along spout 702.

The quantity of spacing hole 701 is three and the equipartition setting in vertical, so sets up, and the floater 607 of being convenient for has the locking state of three not co-located height.

The adjusting component 4 comprises a moving seat 403 and a limiting rod 404, the moving seat 403 is vertically matched with the sliding groove 702 in a sliding manner, the inner sides of the upper parts of the moving seat 403 are both provided with mounting grooves 401 along the transverse direction, the mounting groove 401 is coaxial with the corresponding limiting hole 701, the mounting groove 401 is internally coaxially provided with a limiting rod 404, the inner end of the limiting rod 404 is horizontally matched with the limiting hole 701 at the uppermost part in a sliding way, the outer end of the limiting rod 404 extends out of the moving seat 403 in a sliding way, the part of the limiting rod 404 positioned in the mounting groove 401 is in clearance fit with a pressure spring 406, the end part of the pressure spring 406 far away from the limiting hole 701 is fixedly connected with the mounting groove 401, the end part of the pressure spring 406 close to the limiting hole 701 is fixedly provided with a lantern ring 402, and the collar 402 and the limiting rod 404 are coaxially fixed, so that the moving seat 403 is locked by the matching of the limiting rod 404 and the limiting hole 701 and cannot ascend and descend along the sliding groove 702, meanwhile, the locking of the movable seat 403 which cannot ascend and descend along the sliding groove 702 is released conveniently in a mode that the limiting rod 404 is disengaged from the limiting hole 701.

Lantern ring 402 and mounting groove 401 sliding fit, lantern ring 402 and gag lever post 404 interference fit, so set up, the drive gag lever post 404 that the mode of being convenient for slide along mounting groove 401 through lantern ring 402 is accurate draws outward, and the outer end of gag lever post 404 is fixed with handle 405, and the anti-skidding line has been seted up on handle 405 surface, so set up, be convenient for through the mode pulling gag lever post 404 of handheld handle 405 application of force and avoid handle 405 to take off the hand.

The start-stop assembly 6 comprises a containing box body 5, a limit switch 601 and a mounting plate 603, the containing box body 5 is vertically opened and vertically fixed at the lower part of the outer side of the moving seat 403, the limit switch 601 is fixed at the upper inner part of the containing box body 5 through a mounting frame 608, the limit switch 601 is electrically connected with the water pump 302, the mounting plate 603 is horizontally fixed at the middle part of the inner wall of the containing box body 5, a guide rod 604 is vertically and slidably matched at the middle part of the mounting plate 603, a switch seat 602 for triggering the limit switch 601 is fixed at the top end of the guide rod 604, the switch seat 602 is vertically opposite to the limit switch 601, a floating ball 607 is fixed at the bottom end of the guide rod 604 through a connecting sleeve 606, a spring 605 is in clearance fit at the part of the guide rod 604 between the mounting plate 603 and the connecting sleeve 606, and the two ends of the spring 605 are respectively fixedly connected with the mounting plate 603, the floating ball 607 is a hollow plastic ball, so that the floating ball 607 has enough buoyancy in water, the connecting sleeve 606 is in threaded connection with the guide rod 604, and the connecting sleeve 606 and the guide rod 604 can be conveniently assembled and disassembled.

when in use, rainwater flows into the regulating and storing pool body 2 through the sewer 1, so that the peak flow of rainwater runoff is kept in the regulating and storing pool body 2, and the rainwater is slowly discharged from the regulating and storing pool body 2 after the maximum flow of the rainwater is reduced, so that the peak of rainwater runoff can be avoided, the rainwater utilization rate can be improved, the pollution of initial rainwater to a received water body can be controlled, and the positive effect on drainage scheduling between drainage areas can be achieved, in the using process, the water level in the regulating and storing pool body 2 can rise along with the drainage of the rainwater, when the water level rises to be in contact with the floating ball 607, the floating ball 607 is driven to rise in the process of rising the water level, the floating ball 607 drives the switch seat 602 to rise in a mode of compressing the spring 605 through the guide rod 604 to trigger the limit switch 601, the limit switch 601 immediately starts the water pump 302, the rainwater in the regulating and storing pool is discharged to the outside through the drainage pipe 301 after rising through, so will reach the rainwater of overflow height in the regulation pond body 2 and in time discharge, prevent that regulation pond body 2 from appearing the condition of holding back water, and when rainwater flow weakens and cause the water level to descend, spring 605 releases the compression state of self and makes floater 607 real-time contact water level that descends, until finally floater 607 returns to initial position and switch block 602 leaves limit switch 601, limit switch 601 stops triggering immediately and makes water pump 302 stop working, in the use, when rainwater flow was too big, the position height that needs to adjust floater 607 descends so that regulation pond body 2 starts the overflow in advance, the operation mode is as follows: the handle 405 is pulled outwards and the pressure spring 406 is compressed by the lantern ring 402 to make the limiting rod 404 get out of the corresponding limiting hole 701, then the outward pulling state of the limiting rod 404 is kept and the moving seat 403 is driven to descend along the sliding groove 702, in the process, the floating ball 607 descends along with the moving seat 403, because the number of the limiting holes 701 in the sliding groove 702 is three, when the moving seat 403 descends until the limiting rod 404 is close to the limiting hole 701 at the lowest part, the handle 405 is released, the pressure spring 406 releases the compression state to drive the limiting rod 404 to abut against the inner wall of the sliding groove 702, then the limiting rod 404 continues to slide downwards for a certain distance, when the limiting rod 404 is opposite to the limiting hole 701, the pressure spring 406 continues to release the compression state to drive the limiting rod 404 to be inserted into the corresponding limiting hole 701, so as to lock the position height after the 607 descends, the floating ball 607 triggers the water pump 302 to work for drainage in advance when the rainwater flow is too large, and when the rainwater flow is too small, the floating, so that floater 607 triggers water pump 302 work drainage late, ensures that regulation pond body 2 accumulates sufficient water yield, has realized coming the position height of overflow to carry out quick adjustment according to the precipitation flow of reality, has prevented to appear because precipitation flow too big and regulation pond body 2 untimely circumstances of overflow and because the precipitation flow undersize the circumstances that the water yield can not reach the anticipated target.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. The utility model provides a dispersion regulation pond suitable for drainage system carries mark, includes regulation pond body (2), its characterized in that: the regulation and storage tank body (2) is embedded underground, the top surface of the regulation and storage tank body (2) is open and is level to the ground, the upper part of one side of the regulation and storage tank body (2) is communicated with a sewer (1) for draining rainwater, the lower part of the other side of the regulation and storage tank body (2) is communicated with a drainage assembly (3), and part of the drainage assembly (3) is fixed on the ground;

the adjusting and storing pond body (2) be close to the inner wall upper portion of drainage subassembly (3) is fixed with curb plate (7), spout (702) have vertically been seted up along the outside of curb plate (7), the outside of spout (702) is opened, a plurality of spacing holes (701) along horizontal setting have all been seted up to the inboard of spout (702), and a plurality of spacing hole (701) vertical coincidence, vertical sliding fit has adjusting part (4) in spout (702), just adjusting part (4) and uppermost spacing hole (701) horizontal sliding fit, the vertical being fixed with in outside lower part of adjusting part (4) is used for controlling drainage subassembly (3) operating condition opens and stops subassembly (6).

2. A decentralized storage tank suitable for upgrading drainage systems according to claim 1, characterized in that: the drainage assembly (3) comprises a water pump (302) and a lifting pipe (303), the water pump (302) is fixedly installed on the ground outside the top of the storage tank body (2), the bottom surface of the water pump (302) is vertically and fixedly communicated with the lifting pipe (303), the bottom end of the lifting pipe (303) is horizontally and fixedly communicated with a water outlet pipe (304) through an elbow, the water outlet pipe (304) is communicated with the lower portion of the storage tank body (2), and the outer side of the water pump (302) is fixedly communicated with a water outlet pipe (301).

3. A decentralized storage tank suitable for drain system upgrading according to claim 2, characterized in that: the sliding groove (702) is one of a dovetail groove or an I-shaped groove with a small outer part and a large inner part.

4. A decentralized storage tank suitable for drain system upgrading according to claim 3, characterized in that: the number of the limiting holes (701) is three, and the limiting holes are uniformly distributed in the vertical direction.

5. A decentralized storage tank suitable for drain system upgrading according to any one of claims 3 or 4, characterized in that: the adjusting component (4) comprises a moving seat (403) and a limiting rod (404), the moving seat (403) is in vertical sliding fit with the sliding groove (702), the inner side of the upper part of the moving seat (403) is transversely provided with a mounting groove (401), the mounting groove (401) is coaxial with the corresponding limiting hole (701), the limiting rod (404) is coaxially arranged in the mounting groove (401), the inner end of the limiting rod (404) is in horizontal sliding fit with the uppermost limiting hole (701), the outer end of the limiting rod (404) extends out of the moving seat (403) in a sliding fit manner, a pressure spring (406) is in clearance fit with the part of the limiting rod (404) which is positioned in the mounting groove (401), the end part, far away from the limiting hole (701), of the pressure spring (406) is fixedly connected with the mounting groove (401), and a sleeve ring (402) is fixed at the end part, close to the limiting hole (701), of the pressure spring (406), and the collar (402) and the stop rod (404) are coaxially fixed.

6. A decentralized storage tank suitable for drain system upgrading according to claim 5, characterized in that: the lantern ring (402) is in sliding fit with the mounting groove (401), and the lantern ring (402) is in interference fit with the limiting rod (404).

7. A decentralized storage tank suitable for drain system upgrading according to claim 6, characterized in that: the outer end of the limiting rod (404) is fixed with a handle (405), and anti-skidding lines are formed in the surface of the handle (405).

8. A decentralized storage tank suitable for drain system upgrading according to claim 5 or 6, characterized in that: the start-stop assembly (6) comprises a containing box body (5), a limit switch (601) and a mounting plate (603), wherein the containing box body (5) is vertically fixed at the lower part of the outer side of the moving seat (403) through an upper opening and a lower opening, the limit switch (601) is fixed at the upper part of the containing box body (5) through a mounting frame (608), the limit switch (601) is electrically connected with the water pump (302), the mounting plate (603) is horizontally fixed at the middle part of the inner wall of the containing box body (5), a guide rod (604) is vertically matched at the middle part of the mounting plate (603) in a sliding manner, a switch seat (602) used for triggering the limit switch (601) is fixed at the top end of the guide rod (604), the switch seat (602) is vertically matched with the limit switch (601), a floating ball (607) is fixed at the bottom end of the guide rod (604) through a connecting sleeve, the guide rod (604) is positioned between the mounting plate (603) and the connecting sleeve (606), a spring (605) is in clearance fit with a part of the guide rod between the mounting plate and the connecting sleeve, and two ends of the spring (605) are fixedly connected with the mounting plate (603) and the connecting sleeve (606) respectively.

9. A decentralized storage tank suitable for drain system upgrading according to claim 8, characterized in that: the floating ball (607) is a hollow plastic ball, and the connecting sleeve (606) is connected with the guide rod (604) through threads.

10. The use method of the decentralized storage tank suitable for drain system upgrading according to claim 9, characterized in that: when the rainwater storage tank is used, rainwater flows into the storage tank body (2) through the sewer (1), so that the peak flow of rainwater runoff is kept in the storage tank body (2), the rainwater is slowly discharged from the storage tank body (2) after the maximum flow of the rainwater is reduced, the peak flood of the rainwater can be avoided, the rainwater utilization rate can be improved, the pollution of initial rainwater to a water body can be controlled, and the positive effect on the drainage scheduling among drainage areas can be achieved, in the using process, the water level in the storage tank body (2) can rise along with the drainage of the rainwater, when the water level rises to contact the floating ball (607), the floating ball (607) can be driven to rise in the process that the water level continues to rise, the floating ball (607) drives the switch seat (602) to rise in a mode that the spring (605) is compressed by the guide rod (604) to contact the limit switch (601), the limit switch (601) immediately starts the water pump (302) to lift rainwater in the storage tank through the lifting pipe (303) and then discharge the rainwater to the outside through the drain pipe (301), so as to timely discharge the rainwater reaching the overflow height in the storage tank body (2), prevent the storage tank body (2) from generating a water holding condition, when the rainwater flow is weakened and the water level is lowered, the spring (605) releases the compression state of the spring to enable the floating ball (607) to contact the lowered water level in real time until finally the floating ball (607) returns to the initial position and the switch seat (602) leaves the limit switch (601), immediately stop triggering the limit switch (601) to stop the water pump (302), in the use process, when the rainwater flow is overlarge, the position height of the floating ball (607) needs to be adjusted to be lowered to enable the storage tank body (2) to start overflow in advance, the operation mode is as follows: the handle (405) is held by hand to be pulled outwards, the limiting rod (404) is made to be separated from the corresponding limiting hole (701) in a mode that the compression spring (406) is compressed through the lantern ring (402), then the outward pulling state of the limiting rod (404) is kept, the moving seat (403) is driven to descend along the sliding groove (702), the floating ball (607) descends along the moving seat (403) in the process, the handle (405) is loosened when the moving seat (403) descends until the limiting rod (404) is close to the limiting hole (701) at the lowest part due to the fact that the number of the limiting holes (701) in the sliding groove (702) is three, the compression spring (406) releases the compression state to drive the limiting rod (404) to abut against the inner wall of the sliding groove (702), the limiting rod (404) continuously slides downwards for a certain distance, and the compression spring (406) continuously releases the compression state to drive the limiting rod (404) when the limiting rod (404) is opposite to the limiting hole (701) ) The water pump is inserted into the corresponding limiting hole (701) to lock the position height of the descending floating ball (607), so that the floating ball (607) triggers the water pump (302) to work and drain in advance when the rainwater flow is too large, and the floating ball (607) is adjusted to ascend to the limiting rod (404) to be clamped into the limiting hole (701) at the highest position according to the mode when the rainwater flow is too small, so that the floating ball (607) triggers the water pump (302) to work and drain later, sufficient water is ensured to be accumulated in the storage tank body (2), the position height of overflow is rapidly adjusted according to the actual rainfall flow, and the situations that the overflow of the storage tank body (2) is not timely due to the too large rainfall flow and the situation that the water storage amount cannot reach the expected target due to the too small rainfall flow are prevented.