Hydraulic sewage intercepting well

Abstract

The invention relates to the technical field of municipal drainage, in particular to a hydraulic sewage intercepting well which can realize linkage control of liquid levels in an intercepting well and an overflow well under different incoming water flows through linkage design of the intercepting well, the overflow well, a weir wall, a hydraulic grid and a rubber check valve; all sewage is intercepted in the non-rainfall period, the sewage is intercepted according to the designed interception amount in the rainfall period, and overflow water is discharged out of the water body after being filtered out through a grid; the stability of the sewage interception flow is ensured, and the in-situ purification treatment of the overflow water is also realized. According to the whole intercepting well, liquid level self-adjustment linkage control of the space in the well under different water inlet flows is achieved through the flow limiting valve, the overflow weir and the check valve, the intercepting water amount can be stable and controllable, and overflow water can be filtered and purified; and stable closure and grid self-cleaning can be realized without mechanical and electrical equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of municipal drainage, and more particularly to a hydraulic sewage interception well. Background Art

[0002] During the rainy season, a large amount of first rain mixed with existing sewage is directly discharged into the water body, which brings great pressure to the urban water environment. The pollution characteristics of first rain are mainly manifested in high pollution concentration and complex pollutants, and its impact on the water ecosystem is significant.

[0003] Decentralized processing technology has shown great application value in initial rain management due to its high flexibility, high processing efficiency and small footprint.

[0004] Through the combined application of initial rain storage and decentralized treatment technology, the initial rain can be effectively collected, stored and treated, thereby reducing the burden on the urban drainage system and improving the efficiency of water resource utilization.

[0005] At present, the rainwater and sewage interception system has a complex structure and requires an external power supply. For example, a hydraulic automatic control interception sewage well disclosed in Chinese patent CN108412026A is paralyzed under power outage conditions, affecting flood safety.

[0006] Therefore, it is urgent to invent a hydraulic sewage interception well to solve the above problems. Summary of the invention

[0007] The present invention provides a hydraulic sewage interception well, which realizes stable interception, overflow purification and backflow prevention functions under different inflow conditions through the synergistic effect of the internal structure and components of the hydraulic interception well, so as to optimize the problem of high failure rate of external power supply of traditional interception wells.

[0008] According to one aspect of the present invention, there is provided a hydraulic sewage interception well, comprising a well body, a flow limiting valve and a hydraulic grille, wherein a weir wall is installed in the well body to separate it into an interception well and an overflow well, and a water inlet and an interception port are respectively arranged on the wall plates on opposite sides of the interception well, the flow limiting valve is installed in the interception well and connected to the interception port; the hydraulic grille is installed in the overflow well, and a water outlet is arranged on the wall plates of the overflow well.

[0009] Preferably, based on the above scheme, the hydraulic grille includes a grille mesh and a self-cleaning scraper, the grille mesh is installed on the top of the weir wall, a rotating shaft is set up in the overflow well and is located below the grille mesh, a water wheel is installed on the rotating shaft, the self-cleaning scraper is installed in the overflow well through a mounting shaft and is located below the grille mesh, and the rotating shaft is linked to the mounting shaft.

[0010] Preferably, based on the above solution, a plurality of brushes are arranged on the self-cleaning scraper, and the brushes are in contact with the grille mesh plate.

[0011] Preferably, based on the above solution, the elevation of the water inlet is higher than the elevation of the intercepting port.

[0012] Preferably, on the basis of the above scheme, the flow limiting valve includes a conical flow limiting tank and an overflow pipe, the conical flow limiting tank is installed in the intercepting well in an inclined state, the small end of the conical flow limiting tank is connected to the intercepting port, and the outer edge surface of the large end of the conical flow limiting tank is tangentially connected to the inlet groove; a drain cover is installed on the top of the large end of the conical flow limiting tank, and the drain cover is installed with an overflow pipe.

[0013] Preferably, based on the above scheme, the water outlet is equipped with a water outlet pipe with a rubber check valve, the rubber check valve comprises a shell, an elastomer and a fixing plate, the shell is cylindrical and is mounted on the water outlet, the elastomer is installed in the shell and fixed to the shell through the fixing plate.

[0014] Preferably, based on the above scheme, the elastomer is a rubber elastic cone, the small end of the rubber elastic cone is close to one side of the weir wall, and a water inlet hole is provided at the small end of the rubber elastic cone. When water flows on the rubber elastic cone, the water inlet hole opens to realize the penetration of the water outlet.

[0015] Preferably, based on the above solution, a line connecting a center point of a large end of the rubber elastic cone and a center point of a small end of the rubber elastic cone is arranged at an acute angle to a center line of the water outlet.

[0016] Preferably, based on the above solution, a sealing rubber ring is further provided on the outer side of the shell, and the sealing rubber ring is adsorbed on the outer side of the shell in a tapered shape.

[0017] The present invention also provides a hydraulic sewage interception well, the working state of which is as follows: When the water inlet is less than the interception amount of the flow limiting valve in the interception well, the interior of the flow limiting valve in the interception well is in a non-full flow state, and all the sewage enters the interception pipe through the flow limiting valve; When the water flow at the water inlet is greater than the interception flow of the flow limiting valve in the interception well, the flow limiting valve in the interception well is in a full flow state and forms a swirl flow; When the liquid level in the overflow well is higher than the liquid level at the overflow pipe outlet, the rubber elastic cone inside the check valve is driven to open by external force, and the sewage is discharged to the outside through the overflow pipe outlet; when the liquid level at the overflow pipe outlet is higher than the liquid level at the overflow well, the rubber elastic cone returns to its initial state. At this time, sewage outside the outlet area will not enter the overflow well, realizing the check function; The invention discloses a hydraulic sewage interception well, which divides a well body into an interception well and an overflow well, and controls the flow rate of sewage through the interception well to ensure the sewage treatment effect; a grille grid is arranged on the upper part of the overflow well, and a water wheel is arranged thereunder, when sewage filtered by the grille grid falls on the water wheel from top to bottom, the water wheel is driven to rotate, and the linkage installation shaft is rotated, so as to drive the self-cleaning scraper to automatically clean the grille grid, and no external power is required, and the use is convenient and quick; and a rubber check valve is arranged at the water outlet of the overflow well, and only when the liquid level in the overflow well rises to the opening liquid level of the rubber check valve, the rubber elastic cone inside the check valve is driven to open by external force, and the sewage is discharged to the outside through the water outlet, and when the liquid level in the outer area of ​​the water outlet is higher than the liquid level in the overflow well, the rubber elastic cone returns to the initial state, and at this time, the sewage in the outer area of ​​the water outlet will not enter the overflow well, so that the check function is realized.

[0018] Compared with the prior art, the advantages of the present invention are: the functions of each unit are automatically adjusted by changes in liquid level, the flow limiting valve can realize rainwater and sewage diversion and precise flow interception, the waterwheel drives the filter grille to realize automatic cleaning function without external power, and the overflow water of the filter grille passes through the rubber check valve. When the liquid level at the outlet rises, it will not flow back into the well body. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings: Figure 1 It is a structural schematic diagram of the hydraulic sewage interception well of the present invention; Figure 2 A top view of the hydraulic sewage interception well of the present invention; Figure 3 A top view of the flow limiting valve of the present invention; Figure 4 It is a three-dimensional structural diagram of the installation of the hydraulic grid of the present invention; Figure 5 It is a three-dimensional structural diagram of the hydraulic grid and the waterwheel of the present invention; Description of Figure Numbers: Well body 1, weir wall 11, interception well 12, water inlet 121, interception port 122, overflow well 13, water outlet 131; Flow limiting valve 2, conical flow limiting tank 21, inlet groove 23, drain cover 24, overflow pipe 25, mounting plate 26; Hydraulic grille 3, grille mesh plate 31, self-cleaning scraper 32, rotating shaft 33, water wheel 34, mounting shaft 35, brush 36; connecting rod 37, active bevel gear 51, rotating plate 52, guide rod 53, passive bevel gear 54, slide seat 55, guide rail 56, slide block 57, connecting rod 58; The rubber check valve 4 , the housing 41 , the elastic body 42 , the rubber elastic cone 421 , the water inlet hole 422 , the fixing plate 43 , and the sealing rubber ring 44 . DETAILED DESCRIPTION

[0020] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0021] It should be understood that when used in this specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or collections.

[0022] In order to simplify the drawings, only the parts related to the present invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0023] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0024] In the embodiments shown in the drawings, the indications of directions (such as up, down, left, right, front and back) used to explain the structure and movement of the various components of the present invention are not absolute but relative. These descriptions are appropriate when these components are in the positions shown in the drawings. If the descriptions of the positions of these components change, the indications of these directions also change accordingly.

[0025] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0027] See also Figure 1 , and combined with Figure 2 and Figure 4 As shown, a hydraulic sewage interception well of the present invention comprises a well body 1, a flow limiting valve 2 and a hydraulic grid 3, wherein a weir wall 11 is installed in the well body 1 to separate the well body 1 into an interception well 12 and an overflow well 13.

[0028] In the present invention, a water inlet 121 and an interception port 122 are respectively arranged on the wall plates on opposite sides of the interception well 12, and the flow limiting valve 2 is installed in the interception well 12 and communicated with the interception port 122; the hydraulic grid 3 is installed in the overflow well 13, and a water outlet 131 is arranged on the wall plate of the overflow well 13.

[0029] Specifically, the hydraulic grid 3 of the present invention includes a grid mesh 31 and a self-cleaning scraper 32. The grid mesh 31 is installed on the top of the weir wall 11. A rotating shaft 33 is set up in the overflow well 13 and is located below the grid mesh 31. A water wheel 34 is installed on the rotating shaft 33. The self-cleaning scraper 32 is installed in the overflow well 13 through the installation shaft 35 and is located below the grid mesh 31. The rotating shaft 33 is linked to the installation shaft 35.

[0030] See also Figure 3 As shown, the flow limiting valve 2 of the present invention includes a conical flow limiting tank 21 and an overflow pipe 25. The conical flow limiting tank 21 is installed in an inclined state in the intercepting well 12. The small end of the conical flow limiting tank 21 is connected to the water outlet 131, and the outer edge surface of the large end of the conical flow limiting tank 21 is tangentially connected to the inlet groove 23; a sewage cover 24 is installed on the top of the large end of the conical flow limiting tank 21, and an overflow pipe 25 is installed on the sewage cover 24.

[0031] In order to achieve the purpose of hydraulic interception, sewage enters the intercepting well 12 through the water inlet 121 of the well body 1. As the sewage continues to enter, the liquid level in the intercepting well 12 rises and reaches the position of the inlet groove 23 of the flow limiting valve 2. It enters the conical flow limiting tank 21 through the inlet groove 23, and realizes liquid vortex inside the cavity of the conical flow limiting tank 21. The vortex method is used to accurately control the amount of intercepted sewage, and the intercepted sewage enters the drainage network through the outlet 131.

[0032] The specific working process is as follows: when the water inlet 121 is less than the interception amount of the flow limiting valve 2 in the intercepting well 12, the interior of the flow limiting valve 2 in the intercepting well 12 is in a non-full flow state, and sewage can pass freely; when the water inlet 121 is greater than the interception amount of the flow limiting valve 2 in the intercepting well 12, the flow limiting valve 2 in the intercepting well 12 is in a full flow state and forms a vortex, and the air column / water column in the center of the vortex will occupy part of the flow area of ​​the intercepting port 122, thereby increasing the flow velocity inside the equipment and increasing the head loss of the intercepting well 12, thereby achieving the flow limiting effect.

[0033] When the inflow rate continues to increase, the water loss inside the interception well 12 increases dramatically, causing the inflow liquid level outside the interception well 12 to increase rapidly, and the outflow of the interception well 12 remains within the flow limit. This can be achieved that during non-rainfall periods, all incoming sewage enters the sewage interception port 122 through the flow limiting valve 2; during rainfall periods, as the combined inflow of rainwater and sewage increases, sewage is intercepted according to the designed interception rate and enters the sewage interception port 122, and the remaining rainwater and sewage are restricted in the interception well 12, resulting in an increase in the liquid level; when the liquid level rises to above the weir wall 11, it enters the hydraulic grid 3 for filtration treatment. The hydraulic grid 3 is installed on the weir wall 11, and the water processed by the hydraulic grid 3 enters the overflow well. In the process of falling, it drives the water wheel 34 of the hydraulic grid 3 to rotate. The water wheel 34 further drives the rake teeth to rotate in the interval between the grid bars through the linkage shaft, thereby realizing hydraulic self-cleaning of the hydraulic grid 3; the cleaned grid residue is still located in the interception well 12, and finally enters the sewage interception port 122 with the sewage after the rainfall ends, thereby realizing the filtration treatment of the rainwater and sewage entering the overflow well.

[0034] When the amount of water entering the conical flow limiting tank 21 increases sharply, the flow of the water outlet 131 is not affected and a stable outflow is maintained. The excess sewage overflows through the overflow pipe 25 connected to the sewage cover 24 to ensure the purpose of the conical flow limiting tank 21 to intercept sewage.

[0035] The flow limiting valve 2 is used to limit the outflow of sewage, so that the liquid level in the interception well 12 rises. When the liquid level rises to the internal partition, the sewage passes through the grid mesh plate 31 of the hydraulic grid 3. The grid mesh plate 31 intercepts impurities in the sewage through the grid structure.

[0036] The sewage intercepted by the grille mesh 31 enters the overflow well 13, and flows through the waterwheel 34. The waterwheel 34 is linked to the mounting shaft 35 to rotate, driving the self-cleaning scraper 32 on the mounting shaft 35 to rotate, so as to drive the self-cleaning scraper 32 to reciprocate, thereby achieving the effect of cleaning the grille mesh 31.

[0037] It should be noted that a plurality of brushes 36 are provided on the self-cleaning scraper 32 of the present invention, and the brushes 36 are in contact with the grid mesh 31, that is, when the self-cleaning scraper 32 reciprocates, the brushes 36 thereon rub against the grid mesh 31 to clean it.

[0038] Among them, the elevation position of the water inlet 121 of the present invention is higher than the elevation position of the water outlet 131, and in order to ensure the installation stability of the flow limiting valve 2, the small end of the conical flow limiting tank 21 of the present invention is fixed on the inner wall of the intercepting well 12 through the mounting plate 26, and is connected to the intercepting port 122.

[0039] The rotating shaft 33 of the present invention is linked with the mounting shaft 35. The rotating shaft 33 of the present invention can be provided with a rotating disk 52 and an active bevel gear 51 at the end of the rotating shaft 33, and a guide rod 53 is installed at the end surface of the rotating disk 52 near the active bevel gear 51. A passive bevel gear 54 meshing with the active bevel gear 51 is installed at one end of the guide rod 53, and a slide seat 55 is threadedly sleeved on the guide rod 53; a guide rail 56 is installed in the intercepting well 12, and a slide block 57 is installed on the guide rail 56. The slide block 57 is hinged to the slide seat 55 through a connecting rod 58; and the end of the mounting shaft 35 of the present invention is hinged to the slide block 57 through a connecting rod 37. For the specific structure, please refer to Figure 5 shown.

[0040] Therefore, when the waterwheel 34 drives the rotating shaft 33 to rotate due to the action of the hydraulic pressure difference, it will drive the active bevel gear 51 and the turntable 52 to rotate, and the active bevel gear 51 will mesh with the passive bevel gear 54, driving the guide rod 53 to rotate, so as to drive the slide 55 to make reciprocating linear motion on the guide rod 53, so as to pull the connecting rod 58 to move, drive the slide 55 to move up and down on the guide rail 56, pull the connecting rod 37 to drive the installation shaft 35 to reciprocate, so as to realize the movement of the brush 36 on the installation shaft 35 relative to the grid mesh plate 31 to clean it.

[0041] The above is only an example. Any structure that can drive the mounting shaft 35 to move in conjunction with the rotating shaft 33 can achieve the relative movement of the brush 36 on the mounting shaft 35 and the grille mesh plate 31, and is within the protection of this application.

[0042] Furthermore, in order to prevent external sewage from being introduced into the overflow well 13 through the water outlet 131, the present invention also installs an outlet pipe with a rubber check valve 4 at the water outlet 131. The rubber check valve 4 includes a shell 41, an elastomer 42 and a fixing plate 43. The shell 41 is cylindrical and is mounted on the water outlet 131. The elastomer 42 is installed in the shell 41 and is fixed to the shell 41 through the fixing plate 43. Specifically, the elastomer 42 is a rubber elastic cone 421. The small end of the rubber elastic cone 421 is close to one side of the weir wall 11, and a water inlet hole 422 is provided at the small end of the rubber elastic cone 421. When the water flow acts on the rubber elastic cone 421, the water inlet hole 422 opens to achieve the penetration of the water outlet 131.

[0043] Preferably, the line connecting the center point of the large end of the rubber elastic cone 421 and the center point of the small end of the rubber elastic cone 421 is set at an acute angle to the center line of the water outlet 131, so that when the liquid level on the water inlet side reaches the position of the water inlet hole 422 at the small end of the rubber elastic cone 421, the elastic body 42 opens to achieve the drainage function; and when the water inlet hole 422 at the small end of the rubber elastic cone 421 is higher than the water inlet measured liquid level, the drainage function of the elastic body 42 is closed and the check function is turned on.

[0044] Furthermore, a sealing rubber ring 44 is provided on the outside of the shell 41 . The sealing rubber ring 44 is adsorbed on the outside of the shell 41 in a tapered shape. The sealing rubber ring 44 can better fit the pipe of the water outlet 131 to achieve a sealing effect.

[0045] When the internal liquid level of the intercepting well 12 is higher than the external liquid level of the intercepting well 12, the internal liquid level of the intercepting well 12 rises to the opening liquid level of the rubber check valve 4, and the rubber elastic cone 421 inside the check valve is driven to open by external force, and the sewage is discharged to the outside of the intercepting well 12 through the outlet 131. When the external liquid level of the intercepting well 12 is higher than the internal liquid level of the intercepting well 12, the rubber elastic cone 421 returns to its initial state. At this time, the external sewage of the intercepting well 12 will not enter the interior of the intercepting well 12, thereby realizing the non-return function.

[0046] The hydraulic sewage interception well of the present invention divides the well body 1 into an interception well 12 and an overflow well 13, and controls the flow rate of sewage through the interception well 12 to ensure the sewage treatment effect; a grid grid is arranged on the upper part of the overflow well 13, and a water wheel 34 is arranged below it, when the sewage filtered by the grid grid falls from top to bottom on the water wheel 34, the water wheel 34 is driven to rotate, and the mounting shaft 35 is linked to rotate, so as to drive the self-cleaning scraper 32 to automatically clean the grid grid, without external power, and convenient and quick to use; and A rubber check valve 4 is provided at the water outlet 131 of the overflow well 13. Only when the liquid level in the overflow well 13 rises to the opening level of the rubber check valve 4, the rubber elastic cone 421 inside the check valve is driven to open by an external force, and the sewage is discharged to the outside through the water outlet 131. When the liquid level in the area outside the water outlet 131 is higher than the liquid level of the overflow well 13, the rubber elastic cone 421 returns to its initial state. At this time, the sewage in the area outside the water outlet 131 will not enter the overflow well 13, thereby realizing the check function.

[0047] Compared with the prior art, the advantages of the present invention are: through the linkage design of the interception well 12, the overflow well 13, the weir wall 11, the hydraulic grid 3, and the rubber check valve 4, the linkage control of the liquid level in the interception well 12 and the overflow well 13 can be achieved under different incoming water flow rates; all sewage is intercepted during the non-rainfall period, and sewage is intercepted according to the designed interception volume during the rainfall period, and the overflow water is discharged into the water body after being filtered out by the grid; it not only ensures the stability of the intercepted sewage flow, but also realizes the in-situ purification treatment of the overflow water.

[0048] A hydraulic sewage interception well of the present invention realizes self-regulating linkage control of the liquid level in the well space under different water inlet flow rates through a flow limiting valve, an overflow weir and a check valve, which can not only realize stable and controllable interception water volume, but also realize filtering and purification of overflow water; stable interception and self-cleaning of the grid can be realized without mechanical or electrical equipment.

[0049] Finally, the method of the present application is only a preferred implementation scheme and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A hydraulic sewage interception well, characterized in that: It comprises a well body, a flow limiting valve and a hydraulic grille. The well body is provided with a weir wall to separate it into an interception well and an overflow well. The wall plates on opposite sides of the interception well are respectively provided with a water inlet and an interception port. The flow limiting valve is installed in the interception well and communicated with the interception port. The hydraulic grille is installed in the overflow well, and a water outlet is provided on the wall plate of the overflow well.

2. A hydraulic sewage interception well as claimed in claim 1, characterized in that: The hydraulic grille includes a grille mesh and a self-cleaning scraper. The grille mesh is installed on the top of the weir wall. A rotating shaft is set up in the overflow well and is located below the grille mesh. A water wheel is installed on the rotating shaft. The self-cleaning scraper is installed in the overflow well through a mounting shaft and is located below the grille mesh. The rotating shaft is linked to the mounting shaft.

3. A hydraulic sewage interception well as claimed in claim 2, characterized in that: A plurality of brushes are arranged on the self-cleaning scraper, and the brushes are in contact with the grille mesh plate.

4. A hydraulic sewage interception well as claimed in claim 1, characterized in that: The elevation of the water inlet is higher than the elevation of the intercepting port.

5. A hydraulic sewage interception well as claimed in claim 4, characterized in that: The flow limiting valve includes a conical flow limiting tank and an overflow pipe. The conical flow limiting tank is installed in the intercepting well in an inclined state. The small end of the conical flow limiting tank is connected to the intercepting port, and the outer edge surface of the large end of the conical flow limiting tank is tangentially connected to an inlet groove; a sewage cover is installed on the top of the large end of the conical flow limiting tank, and an overflow pipe is installed on the sewage cover.

6. A hydraulic sewage interception well as claimed in claim 5, characterized in that: The water outlet is equipped with a water outlet pipe with a rubber check valve, and the rubber check valve includes a shell, an elastic body and a fixing plate. The shell is cylindrical and is sleeved on the water outlet. The elastic body is installed in the shell and fixed to the shell through the fixing plate.

7. A hydraulic sewage interception well as claimed in claim 6, characterized in that: The elastic body is a rubber elastic cone, the small end of which is close to one side of the weir wall, and a water inlet hole is arranged at the small end of the rubber elastic cone. When water flows on the rubber elastic cone, the water inlet hole opens to realize the penetration of the water outlet.

8. A hydraulic sewage interception well as claimed in claim 7, characterized in that: A line connecting a center point of a large end of the rubber elastic cone and a center point of a small end of the rubber elastic cone is arranged at an acute angle to a center line of the water outlet.

9. A hydraulic sewage interception well as claimed in claim 7, characterized in that: A sealing rubber ring is also provided on the outer side of the shell, and the sealing rubber ring is adsorbed on the outer side of the shell in a tapered shape.

10. A hydraulic sewage interception well as claimed in claim 6, characterized in that: Its working status is as follows: When the water inlet is less than the interception amount of the flow limiting valve in the interception well, the interior of the flow limiting valve in the interception well is in a non-full flow state, and all the sewage enters the interception pipe through the flow limiting valve; When the water flow at the water inlet is greater than the interception flow of the flow limiting valve in the interception well, the flow limiting valve in the interception well is in a full flow state and forms a swirl flow; When the liquid level in the overflow well is higher than the liquid level at the overflow pipe outlet, the rubber elastic cone inside the check valve is driven to open by external force, and the sewage is discharged to the outside through the overflow pipe outlet; when the liquid level at the overflow pipe outlet is higher than the liquid level at the overflow well, the rubber elastic cone returns to its initial state. At this time, sewage in the area outside the outlet will not enter the overflow well, thus realizing the check function.

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