CN212200655U

CN212200655U - Resistance-free self-draining backflow-preventing and waterlogging-draining device

Info

Publication number: CN212200655U
Application number: CN201921939359.XU
Authority: CN
Inventors: 刘福光; 刘敬涛; 赵煜灵; 刘乐嘉; 罗谨
Original assignee: Architectural Design and Research Institute of Guangdong Province
Current assignee: Architectural Design and Research Institute of Guangdong Province
Priority date: 2019-11-11
Filing date: 2019-11-11
Publication date: 2020-12-22
Anticipated expiration: 2029-11-11

Abstract

The utility model discloses a non-resistance self-draining anti-backflow drainage device, which mainly comprises a drainage well, a water inlet pipe and a gravity drain pipe which are arranged on the side wall of the drainage well, the bottom surface of the drainage well is lower than the lower ends of the water inlet pipe and the gravity drain pipe, the non-resistance self-draining anti-backflow drainage device also comprises a water collecting pool at the side edge of the drainage well, an overflow weir is arranged between the drainage well and the water collecting pool, the drainage is separated by the overflow weir, a water pump is arranged in the water collecting pool, the water pump is used for extracting water in the water collecting pool, the water outlet end of the water pump is connected with a water pump drain pipe, the water outlet of the water pump drain pipe extends to the outside, a flap valve is arranged on the gravity drain pipe through a driving mechanism, and; when the water level in the drainage well is higher than the overflow weir, the water overflows to the water collecting tank, and at the moment, the water pump is started to discharge the water in the water collecting tank outwards. The utility model discloses the drainage ability in improvement town that can be very big prevents waterlogging.

Description

Resistance-free self-draining backflow-preventing and waterlogging-draining device

Technical Field

The utility model relates to a non-resistance self-draining anti-backflow drainage device.

Background

With the development of economy and the continuous promotion of urbanization process in China, the urban scale is rapidly enlarged, and the change of land utilization forms changes the structural characteristics and ecological environment of cities. in the urban development process, the phenomena of delayed construction of drainage and waterlogging prevention facilities, low standard, water systems of rivers and lakes and the like exist, so that the flood disasters frequently occur, and the lives and properties of people are greatly lost. In the process of promoting the construction of sponge cities, the comprehensive capability of urban drainage and waterlogging prevention is comprehensively improved, the drainage requirement of cities/towns is improved from the original capability of draining water for 1-2 years to the capability of draining water for 3-5 years, however, the existing drainage pipe network facilities in the cities/towns cannot meet the requirements, and the problem of urban waterlogging is solved.

The important reason that the municipal drainage pipe network of the existing city/town lags behind is that the drainage facilities at the drainage port of the drainage pipe network lag behind and can not meet the higher drainage requirements of flood. The drainage facilities at the existing drainage port can be simply divided into a gravity drainage device and a water pump drainage device. The gravity drainage device is used for draining water by utilizing water potential generated by water flow, the existing gravity drainage device is generally a water outlet pipe and a flap valve arranged at the outer port of the water outlet pipe, but for facilitating environment-friendly water quality detection in partial cities, a water quality sampling well is additionally arranged at the inner port of the water outlet pipe and is used for acquiring a water sample at the position of the water outlet port, the water sample is called a drainage well for short, namely, an upgraded drainage device comprising the drainage well, a water inlet pipe, the flap valve and the water outlet pipe is further arranged at one side wall of the drainage well, a drainage pipe is arranged at the same height of the other opposite side wall, and the flap valve which can only be opened in one direction is arranged at the position of the water inlet pipe positioned in the drainage well. When the water-saving valve is used, water enters from the water inlet pipe and impacts on the flap valve, so that the flap valve is opened, and the water flows into the drainage well. When the water level in the drainage well is higher than the drainage pipe, the water is naturally drained to the outside from the drainage pipe by means of the gravity of the water body. The flap valve is characterized in that energy is not consumed, but in the using process, the gravity of the flap valve can generate certain resistance to the inflow of water flow, and the flap valve can be pushed to be discharged when the water flow is accumulated to a certain amount; if the flap valve is arranged in the drainage well, the flap valve on the drainage pipe can not be opened when the water level of the water in the rivers and the lakes is higher than the water outlet pipe and the water flows back into the drainage well, and the sewage can not be discharged. Therefore, when running into rivers and lakes flood, outside water level surge often leads to outside water to flow backward into the drainage well, and the flap valve is closed under hydraulic effect this moment, though can prevent outside water further to flow backward into the drainage pipe network in cities and towns, but nevertheless can cause gravity drainage device's waterlogging, also makes this drainage facility lose the drainage function in cities and towns need the drainage simultaneously, can't in time drain the waterlogging. In addition, when the water flow is small enough to overcome the gravity of the flap valve and push the flap valve open, accumulated water and sediments are generated in the water inlet pipe, so that the water inlet pipe is corroded, the environment in the pipe is deteriorated by the accumulated water, and germs and mosquitoes are bred.

And water pump drainage device is for relying on the water pump to carry out the drainage device of drainage, and current water pump drainage device mainly includes drainage shaft, water pump, inlet tube and drain pipe, is provided with the inlet tube on the lateral wall of drainage shaft, sets up the drain pipe on another relative lateral wall, the water pump export and the water piping connection that set up in drainage shaft. Water flowing into the drainage well from the water inlet is pumped by the water pump and drained through the drainage pipe. The water pump drainage device has the disadvantages that the water pump drainage device completely depends on the water pump to drain water, and a large amount of electric energy is consumed.

Due to the high energy consumption characteristic of the water pump drainage device, in the existing cities and towns, the gravity drainage device is basically used for drainage directly, the water pump drainage device is used for strong drainage only in special geographical positions such as low-lying areas, and in rainy seasons or heavy rain, the operation of the gravity drainage device is seriously influenced due to the high water level of rivers and lakes, so that waterlogging occurs in the cities and towns.

Obviously, the situation that the gravity drainage device used in a large range by the drainage device at the drainage port of the existing urban/town drainage pipe network is only used by the water pump drainage device in a small part is difficult to adapt to the rapid development of the urban/town and the municipal construction requirement of high-standard drainage waterlogging prevention comprehensive capacity caused by the rapid development of the urban/town drainage pipe network.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a non-resistance is from arranging the drainage device that prevents flowing backward, its can very big improvement drainage ability in cities and towns, prevents the waterlogging.

The utility model discloses a technical scheme that the purpose was adopted realizes:

the utility model provides a non-resistance is from arranging and is prevented flowing backward drainage waterlogging device, mainly includes the drainage well and inlet tube and the gravity drain pipe that sets up on the lateral wall of drainage well, the bottom surface of drainage well is less than the lower extreme of inlet tube and gravity drain pipe, its characterized in that: the non-resistance self-draining anti-backflow drainage device is characterized in that a water collecting tank is further arranged on the side edge of the drainage well, an overflow weir is arranged between the drainage well and the water collecting tank and is separated through the overflow weir, a water pump is arranged in the water collecting tank and is used for pumping water in the water collecting tank, a water outlet end of the water pump is connected with a water pump drainage pipe, a water outlet of the water pump drainage pipe extends to the outside, a flap valve is arranged on the gravity drainage pipe through a driving mechanism, and a flap valve cover is arranged at a water outlet of the gravity drainage pipe; and when the water level in the drainage well is higher than the overflow weir, overflowing to the water collecting tank, and starting the water pump to discharge the water in the water collecting tank outwards.

The number of the water pumps can be one, two or even more according to the design of actual water discharge. In the operation process, rainwater or sewage enters the drainage well from the water inlet pipe, and a certain amount of rainwater or sewage can be stored all the time due to the lower bottom surface of the drainage well, so that sampling is convenient; when the water level at the water outlet of the gravity drainage pipe is lower than the lower end of the water outlet of the gravity drainage pipe, the rainwater or sewage entering the drainage well is drained to the outside through the gravity drainage pipe by the water potential of the rainwater or the sewage, so that gravity drainage is realized; when the water level at the water outlet of the gravity drainage pipe is higher than the lower end of the water outlet of the gravity drainage pipe, the flap valve is tightly closed to prevent backflow, the water level in the drainage well rises, the water flows into the water collecting tank when the water level exceeds the overflow weir, rainwater or sewage flowing into the water collecting tank is extracted by the water pump and is discharged outwards quickly through the water pump drainage pipe, and powerful drainage of the water pump is realized.

The flap valve is connected with the floating ball through the lever mechanism; when the water level at the water outlet of the gravity drainage pipe is lower than the lower end of the water outlet of the gravity drainage pipe, the flap valve is opened by utilizing the gravity of the floating ball; when the water level at the water outlet of the gravity drainage pipe is higher than the lower end of the water outlet of the gravity drainage pipe, the flap valve is tightly closed by the buoyancy generated by the floating ball. The overflow weir is flush with the upper end of the water inlet of the gravity drainage pipe.

In order to make gravity drainage more stable, a protection well formed by concave is arranged on the outer side surface of the drainage well corresponding to the gravity drainage pipe, and a water outlet of the gravity drainage pipe is positioned in the protection well. Therefore, the floating ball can be prevented from being influenced by external water flow fluctuation, and particularly when the water pump pumps water outwards, the water pump water outlet water force fluctuation can cause the floating ball and the cover plate to shake to influence the closing tightness of the flap valve cover plate.

Preferably, the overflow weir is flush with the upper end of the water inlet of the gravity drain pipe. Thus, the water level of the drainage well is more reasonably controlled.

In order to better realize automation, the resistance-free self-draining backflow-preventing and waterlogging-draining device further comprises a controller and a liquid level signal device arranged in the water collecting tank, wherein the liquid level signal device and the water pump are respectively and electrically connected with the controller.

In order to better maintain the parts at the water outlet of the gravity drainage pipe, the water outlet of the gravity drainage pipe is detachably connected with an installation pipe, a flap valve cover is arranged at the port of the installation pipe, and a lever mechanism is arranged on the installation pipe. When in maintenance, the installation pipe can be directly dismounted together with the flap valve and the lever mechanism on the installation pipe, so that the installation pipe can be directly replaced or transported to the outside for convenient maintenance.

The lever mechanism can be implemented as follows: the lever mechanism comprises a hinged support, a lever, a guide rod and a guide sleeve, the hinged support is fixed on the upper portion of the installation pipe, the guide sleeve is vertically fixed on the side portion of the installation pipe, the guide rod movably penetrates through the guide sleeve, the floating ball can be vertically adjusted and installed at the lower end of the guide rod, the middle portion of the lever is hinged to the hinged support, the flap valve is fixedly installed at one end of the lever, and the other end of the lever is provided with a waist hole and is hinged to the upper end of the guide rod through the.

More specifically, the guide rod comprises a horizontal section and a miter section which extends obliquely towards the port direction of the mounting pipe, the horizontal section is connected to the upper end of the miter section, the middle of the miter section is hinged to the hinged support, and the flap valve is fixed to the lower end of the miter section.

In order to enable the flap door to better cover the port of the installation pipe, the end face of the installation pipe inclines towards the front lower part, and the flap door is flatly attached to and covers the end face of the installation pipe.

The installation implementation structure of floater can be: the lower end of the guide rod is provided with external threads, the floating ball movably penetrates through the lower end of the guide rod, and nuts used for clamping the floating ball are respectively in threaded connection above and below the floating ball.

In order to ensure that the whole structure is more balanced and stable, the resistance-free self-draining backflow-preventing and waterlogging-draining device comprises two sets of lever mechanisms and two floating balls, wherein the two sets of lever mechanisms are symmetrically installed by taking the vertical central line of the installation pipe as a symmetrical line.

Compared with the prior art, the utility model discloses following beneficial effect has:

1. the utility model discloses the setting has the catch basin of water pump, and the catch basin passes through the overflow weir with the drainage well and separates to realize automatic adaptation environment, switch over automatically, when rainwater or sewage are not many relatively in external environment, directly through the drainage of gravity drain pipe, need not the power consumption, when rainwater or sewage are more relatively in external environment, the flap valve is closed, and rainwater or the automatic overflow of sewage are to the catch basin, switch over for carrying out quick, powerful drainage by the water pump, prevent waterlogging. Work as the utility model discloses replace current gravity drainage device, use in the cities and towns, the energy consumption burden in increase cities and towns that can not be too big promptly also can prevent waterlogging, the drainage ability of very big improvement cities and towns.

2. The utility model discloses a flap valve drives through the cooperation of lever mechanism and floater, utilizes buoyancy to realize that the automation of flap valve is opened or tightly closes, and at gravity drainage in-process, the gravity of flap valve is offset by buoyancy, no longer produces the resistance to rivers, realizes that the non-resistance emission is higher than the lower extreme of the delivery port of gravity drain pipe at the water level of the delivery port department of gravity drain pipe, flap valve is automatic tightly closed, prevents to flow backward, and realizes automatic switch-over to water pump drainage. Additionally, the utility model discloses an automatic opening or the tight closure of flap valve relies on buoyancy to realize totally, need not to use electric power, in the device that involves water, the structure of no electric power can be safe and reliable more, life is longer.

3. The utility model discloses a lever mechanism is rational in infrastructure simple to the up-and-down motion of guide arm and guide pin bushing's cooperation guide floater, the motion is stable smooth and easy, can avoid the floater to arouse because of the rivers reason and rock, and then avoids frequently closing and opening of clapping the door.

4. The utility model discloses a through the automatic control of realization water pump that controller and liquid level signal ware can be better.

Drawings

Fig. 1 is a top view of the present invention;

FIG. 2 is a cross-sectional view of the present invention;

3 FIG. 33 3 is 3 a 3 cross 3- 3 sectional 3 view 3 taken 3 along 3 A 3- 3 A 3 in 3 FIG. 31 3; 3

FIG. 4 is a cross-sectional view taken along line B-B of FIG. 1;

FIG. 5 is a cross-sectional view taken along line C-C of FIG. 1;

fig. 6 is a top view of the mounting tube, lever mechanism and float assembly of the present invention;

fig. 7 is a front view of the mounting pipe, the lever mechanism and the floating ball assembly of the present invention;

FIG. 8 is a cross-sectional view taken along line 1-1 of FIG. 6;

FIG. 9 is a cross-sectional view taken along line 2-2 of FIG. 6;

fig. 10 is a schematic view of the structure of the flap valve.

The reference numerals in the drawings mean:

1-an inlet; 2-maintenance port; 3-water inlet pipe; 4-gravity drain pipe; 5-flap valve; 6-water pump drain pipe; 7-a connector; 8-climbing a ladder; 9-a water pump; 10-an auto-coupling structure; 11-a drainage well; 12-an overflow weir; 13-hole covers; 14-maintenance of the cover; 15-a base; 16-a liquid level annunciator; 17-a gate valve; 18-a check valve; 19-a soft joint; 20-vertical guide rod; 21-a cable; 22-a water collecting tank; 23-a hinged support; 24-a floating ball; 25-guide sleeve; 26-a guide rod; 27-a lever; 28-a nut; 29-horizontal segment; 30-installing a pipe; 31-a housing; 32-a guard well; 33-a mitered section; 34-cross bar.

Detailed Description

The present invention will be further described with reference to the following examples.

The non-resistance self-draining backflow-preventing and water-logging-draining device shown in fig. 1 to 5 comprises a shell 31, wherein a drainage well 11, a water collecting tank 22 and two water pumps 9 are arranged in the shell 31.

The side wall of the drainage well 11 is provided with a water inlet pipe 3 and a gravity drainage pipe 4 which are communicated with the drainage well. The inlet of the inlet pipe 3 is located outside the housing for the inlet of the water flow. The water outlet of the gravity drainage pipe 4 is positioned outside the shell, and water flow passing through the gravity drainage pipe flows out of the water outlet of the gravity drainage pipe to the outside.

As shown in FIG. 3, the bottom surface of the drainage well 11 is lower than the lower ends of the water inlet pipe and the gravity drainage pipe 4, and the phase difference is 500-1000 mm, so that a certain water body can be stored at the bottom of the drainage well 11, and the sampling monitoring of workers is facilitated.

An overflow weir 12 is arranged between the drainage well 11 and the water collecting tank 22, the separation is carried out through the overflow weir 12, the height of the overflow weir 12 is flush with the upper end of the water inlet of the gravity drainage pipe 4, and when the liquid level of the water body of the drainage well 11 is higher than that of the overflow weir 12, the water body flows into the water collecting tank 22 over the overflow weir 12. The water pump 9 is arranged in the water collecting tank 22 and used for extracting water in the water collecting tank 22, the water outlet end of the water pump 9 is connected with the water pump drainage pipe 6, and the water outlet of the water pump drainage pipe 6 extends to the outside of the shell 31, so that drainage of the water pump 9 is realized. The outer end of the water pump drain pipe 6 is connected with an external drain pipeline, and the height of the external drain pipeline can be higher than that of the drainage device.

The gravity drainage pipe 4 is provided with a flap valve 5 covering the water outlet, and the flap valve 5 is connected with a floating ball 24 through a lever mechanism. In the operation process, when the water level of the water body at the water outlet of the gravity drainage pipe 4 is lower than the lower end of the water outlet of the gravity drainage pipe 4, the flap valve 5 is opened by utilizing the gravity of the floating ball 24, so that resistance-free drainage is realized; when the water level of the water body at the water outlet of the gravity drainage pipe 4 is higher than the lower end of the water outlet of the gravity drainage pipe 4, the flap valve 5 is tightly closed by the buoyancy generated by the floating ball 24, and the backflow is prevented.

The float 24 may be made of stainless steel or HDPE plastic. The housing 31, the drain well 11 and the sump 11 are made of reinforced concrete, stainless steel plate, glass steel plate, etc.

Wherein, a protection well 32 formed by concave is arranged on the outer side surface of the shell 31 corresponding to the gravity drainage pipe 4, and the water outlet of the gravity drainage pipe 4 is positioned in the protection well 32. As shown in fig. 2, the right side of the guard well 32 is a lap that communicates directly with the outside.

For better automation, a controller and a level annunciator 16 are also provided in the present embodiment, and the level annunciator 16 is provided in the water collection tank 22 for detecting the water level of the water in the water collection tank 22. By means of the controller and level annunciator 16: when the water level of the water body in the water collecting tank 22 reaches the set height, the liquid level annunciator 16 is triggered, the liquid level annunciator 16 sends a liquid level signal, the controller receives the liquid level signal and controls the water pump 9 to start, and when the water level falls back to be lower than the set height again, the liquid level annunciator 16 stops sending signals, and the controller controls the water pump 9 to stop. As shown in fig. 4, the liquid level annunciator 16 of the present embodiment is provided with three inductive heads, i.e., an upper inductive head, a middle inductive head, a lower inductive head, and when the water level rises to the middle position to trigger the middle inductive head, one water pump 9 is started to drain water, when the water level rises to the upper position to trigger the upper inductive head, two water pumps 9 are started to drain water more quickly, and when the water level falls to the lower position and only the lower inductive head is triggered, the water pump 9 is controlled to stop.

As shown in fig. 6 to 10, a mounting pipe 30 is detachably connected to the water outlet of the gravity drainage pipe 4, in this embodiment, the mounting pipe 30 is detachably connected by a bolt, a flap valve 5 is covered on the port of the mounting pipe 30, and a lever mechanism is mounted on the mounting pipe 30.

The lever mechanism of the embodiment comprises a hinged support 23, a lever 27, a guide rod 26 and a guide sleeve 25, wherein the hinged support 23 is fixed on the upper part of a mounting pipe 30, the guide sleeve 25 is vertically fixed on the side part of the mounting pipe 30, the guide rod 26 movably penetrates through the guide sleeve 25, the guide rod 26 can slide up and down relative to the guide sleeve 25, a floating ball 24 can be vertically adjusted and installed at the lower end of the guide rod 26, the position of the floating ball 24 corresponds to the lower part of the mounting pipe 30, the middle part of the lever 27 is hinged on the hinged support 23, a flap door 5 is fixedly installed at one end of the lever 27, and the other end of the lever 27 is provided with a waist hole. More specifically, as shown in fig. 7, the guide rod 27 includes a horizontal section 29 and a miter section 33 extending obliquely toward the end of the mounting pipe 30, the horizontal section 29 is connected to the upper end of the miter section, the middle of the miter section 33 is hinged to the hinge support 23, and the flapper 5 is fixed to the lower end of the miter section 33. The end face of the mounting pipe 30 is inclined forward and downward, and the flap door 5 is flush with and covers the end face of the mounting pipe 30. The lever mechanism of the embodiment can also avoid the floating ball from horizontally shaking in the use process as much as possible through the guide sleeve 25.

In the operation process, when the external water level is lower than the lower end of the water outlet of the installation pipe 30, the guide rod 26 is pulled downwards to a certain position through the weight of the floating ball 24, and meanwhile, the lever 27 is driven to rotate, so that the flap valve 5 is opened; when the water level outside is higher than the lower end of the water outlet of the installation pipe 30, the floating ball 24 floats on the water surface, buoyancy is generated, and upward pressure is generated on the corresponding end of the lever 27 through the guide rod 26, so that the flap valve 5 is tightly covered on the port of the installation pipe 30. In addition, the opening angle of the flap valve 5 when the external water level is lower than the lower end of the water outlet of the installation pipe 30 can be changed by adjusting the position of the floating ball 24 up and down.

The structure that floater 24 can be adjusted from top to bottom is: the lower end of the guide rod 26 is provided with external threads, the floating ball 24 movably penetrates through the lower end of the guide rod 26, nuts 28 for clamping the floating ball are respectively connected above and below the floating ball 24 in a threaded manner, and the position of the floating ball 24 can be adjusted by adjusting the position of the nuts 28.

In order to make the whole structure more balanced and stable, the non-resistance self-draining backflow-preventing and waterlogging-draining device of the embodiment comprises two sets of lever mechanisms and two floating balls 24, wherein the two sets of lever mechanisms are symmetrically installed by taking the vertical center line of the installation pipe as a symmetry line. The horizontal sections of the levers 27 of the two sets of lever mechanisms are also connected by a cross bar 34, so that the operation is more stable.

This non-resistance self-draining prevents flowing backward drainage waterlogging device is equipped with entry 1 on drainage shaft 11 for the convenience of maintenance and sample, at entry 1 upper cover porose lid 13, is equipped with cat ladder 8 corresponding to the position of entry 1 on drainage shaft 11's lateral wall. Maintenance ports 2 are respectively arranged on the upper surface of the water collecting tank 22 corresponding to the two water pumps, and maintenance covers 14 are arranged on the maintenance ports 2 in a covering mode, so that the water pumps 9 can be maintained conveniently. The water pump 9 is installed through the automatic coupling structure 10, the automatic coupling structure 10 is a conventional structure, when the water pump is installed, the water pump 9 can slide down to the base 15 which is installed at the bottom in advance along the vertical guide rod 20, the automatic coupling is sealed through the gravity of the water pump 9, the water outlet end of the water pump 9 is connected with the water inlet end of the pipeline on the base 15, the water outlet end of the base 15 is connected with a vertical water pipe through the soft joint 19, and the vertical water pipe is connected with the water pump drainage pipe 6 through the gate valve 17 and the check valve 18. An electric connecting groove is arranged between the two-dimensional repaired mouths 2, the end part of the cable 21 of the water pump 9 is provided with a connector 7, and the connector 7 is arranged in the electric connecting groove and enables the water pump to be connected with an external power supply.

The above embodiments of the present invention are not right the utility model discloses the limited protection scope, the utility model discloses an embodiment is not limited to this, all kinds of basis according to the above-mentioned of the utility model discloses an under the above-mentioned basic technical thought prerequisite of the utility model, right according to ordinary technical knowledge and the conventional means in this field the modification, replacement or the change of other multiple forms that above-mentioned structure made all should fall within the protection scope of the utility model.

Claims

1. The utility model provides a non-resistance is from arranging and is prevented flowing backward drainage waterlogging device, mainly includes the drainage well and inlet tube and the gravity drain pipe that sets up on the lateral wall of drainage well, the bottom surface of drainage well is less than the lower extreme of inlet tube and gravity drain pipe, its characterized in that: the resistance-free self-draining backflow-preventing drainage waterlogging device is characterized in that a water collecting tank is further arranged on the side edge of the drainage well, an overflow weir is arranged between the drainage well and the water collecting tank and is separated by the overflow weir, a water pump is arranged in the water collecting tank and is used for pumping water in the water collecting tank, a water outlet end of the water pump is connected with a water pump drainage pipe, a water outlet of the water pump drainage pipe extends to the outside, a flap valve is arranged on the gravity drainage pipe through a driving mechanism, and a flap valve cover is arranged at a water outlet of the gravity drainage pipe; and when the water level in the drainage well is higher than the overflow weir, overflowing to the water collecting tank, and starting the water pump to discharge the water in the water collecting tank outwards.

2. The non-resistance self-draining anti-backflow and drainage device according to claim 1, is characterized in that: the driving mechanism comprises a lever mechanism and a floating ball, and the flap valve is connected with the floating ball through the lever mechanism; when the water level at the water outlet of the gravity drainage pipe is lower than the lower end of the water outlet of the gravity drainage pipe, the flap valve is opened by utilizing the gravity of the floating ball; when the water level at the water outlet of the gravity drainage pipe is higher than the lower end of the water outlet of the gravity drainage pipe, the flap valve is tightly closed by buoyancy generated by the floating ball.

3. The non-resistance self-draining anti-backflow and drainage device according to claim 1, is characterized in that: the outer side surface of the drainage well corresponding to the gravity drainage pipe is provided with a protection well formed by an inner concave, and the water outlet of the gravity drainage pipe is positioned in the protection well.

4. The non-resistance self-draining anti-backflow and drainage device according to claim 1, is characterized in that: the overflow weir is flush with the upper end of the water inlet of the gravity drainage pipe.

5. The non-resistance self-draining anti-backflow and drainage device according to claim 1, is characterized in that: the resistance-free self-draining backflow-preventing and water-logging-draining device further comprises a controller and a liquid level signal device arranged in the water collecting tank, and the liquid level signal device and the water pump are respectively and electrically connected with the controller.

6. The non-resistance self-draining anti-backflow and drainage device according to claim 2, is characterized in that: the water outlet of the gravity drain pipe is detachably connected with an installation pipe, the flap valve cover is arranged on the port of the installation pipe, and the lever mechanism is arranged on the installation pipe.

7. The non-resistance self-draining anti-backflow and water-logging device as claimed in claim 6, wherein: the lever mechanism comprises a hinged support, a lever, a guide rod and a guide sleeve, the hinged support is fixed on the upper portion of the installation pipe, the guide sleeve is vertically fixed on the lateral portion of the installation pipe, the guide rod movably penetrates through the guide sleeve, the floating ball is installed at the lower end of the guide rod in an up-and-down adjusting mode, the middle of the lever is hinged to the hinged support, the flap valve is fixedly installed at one end of the lever, and the other end of the lever is provided with a waist hole and is hinged to the upper end of the guide rod through the waist hole.

8. The non-resistance self-draining anti-backflow and water-logging device as claimed in claim 7, wherein: the guide rod comprises a horizontal section and an oblique section which extends towards the port direction of the mounting pipe in an inclined mode, the horizontal section is connected to the upper end of the oblique section, the middle of the oblique section is hinged to the hinged support, and the flap valve is fixed to the lower end of the oblique section.

9. The non-resistance self-draining anti-backflow and water-logging device as claimed in claim 8, wherein: the end surface of the mounting pipe inclines towards the front lower part, and the flap valve is flatly attached to and covers the end surface of the mounting pipe.

10. The non-resistance self-draining anti-backflow and water-logging device as claimed in claim 9, wherein: the lower end of the guide rod is provided with external threads, the floating ball movably penetrates through the lower end of the guide rod, and nuts used for clamping the floating ball are respectively connected above and below the floating ball in a threaded mode.