Siphon water flow system and drainage method

Abstract

This application relates to the technical field of drainage treatment, and particularly to a siphon water flow system and a drainage method. Among them, the siphon water flow system includes: a siphon pipe, which includes a U-shaped water inlet pipe, a water outlet pipe, and a connecting pipe connecting the U-shaped water inlet pipe and the water outlet pipe; a spiral water flow guide, which is arranged in the U-shaped water inlet pipe, and the liquid flows through the spiral flow guide path on the spiral water flow guide; an overflow tank, and the water outlet pipe of the siphon pipe is inserted into the overflow tank. By using the solution provided by this application, the amount of air brought into the siphon pipe during the process of the liquid entering the siphon pipe can be effectively reduced, so that the siphon water flow system can maintain stable operation for a long time.

Description

Technical Field

[0001] The present application relates to the field of drainage technology, and in particular to a siphon water system and a drainage method. Background Art

[0002] In a siphon, if there is a certain distance between the water inlet and the liquid level of the U-shaped water inlet pipe, when water falls vertically into the U-shaped water inlet pipe, the air will be drawn into the water to form bubbles due to the impact caused by the drop. If the flow rate is large, the bubbles will flow over the water seal and enter the siphon pipe behind it, forming air accumulation at the highest point of the siphon pipe. When the air accumulation area in the siphon pipe reaches a certain volume, the siphon effect will be destroyed. Summary of the invention

[0003] The purpose of the present application is to reduce the amount of air brought into the siphon liquid during the process of the liquid entering the siphon, so that the siphon water flow system can operate stably for a long time.

[0004] In order to achieve the above objectives, this application provides the following technical solutions:

[0005] A siphon water flow system, comprising:

[0006] A siphon, the siphon comprising a U-shaped water inlet pipe, a water outlet pipe and a connecting pipe connecting the U-shaped water inlet pipe and the water outlet pipe;

[0007] A spiral water flow device, wherein the spiral water flow device is arranged in the U-shaped water inlet pipe, and the liquid flows through the spiral guide path on the spiral water flow device;

[0008] An overflow trough, wherein the water outlet pipe of the siphon pipe is inserted into the overflow trough.

[0009] In one embodiment, the outer diameter of the spiral of the spiral water flow device is adapted to the inner diameter of the U-shaped water inlet pipe of the siphon pipe.

[0010] In one embodiment, the bottom end of the spiral water slide is suspended above the water seal liquid surface of the U-shaped water inlet pipe.

[0011] In one embodiment, the spiral water sluice comprises:

[0012] vertical center column;

[0013] A spiral blade is arranged on the vertical central column so that liquid flows through a spiral guide path formed by the spiral blade.

[0014] In one embodiment, the vertical center column is a vertical through tube.

[0015] In one embodiment, a preset number of air outlet holes are provided below the connection position between the vertical middle through pipe and the spiral blade.

[0016] In one embodiment, the height of the starting end above the spiral blade is lower than the height of the top end of the vertical central column.

[0017] In one embodiment, the bottom height of the water outlet end of the spiral blade is not higher than the bottom height of the vertical central column.

[0018] Furthermore, the present application also provides a drainage method, which adopts the siphon water flow system described in any one of the above technical solutions. The drainage method includes:

[0019] Previously, the siphon water flow system is in a full water state to meet the siphon condition;

[0020] Inject liquid through the water inlet hole of the U-shaped water inlet pipe;

[0021] The liquid enters the U-shaped water inlet pipe of the siphon along the spiral diversion path of the spiral water chute;

[0022] When the liquid level height in the U-shaped water inlet pipe is higher than the liquid level height in the overflow tank, under the action of the siphon effect, the liquid enters the overflow tank through the connecting pipe of the siphon.

[0023] Furthermore, the present application also provides a sewage treatment system, including:

[0024] A sewage treatment device and the siphon water flow system described in any one of the above technical solutions, and the sewage treatment device is connected to the siphon water flow system.

[0025] Compared with the prior art, the solution of the present application has the following advantages:

[0026] The siphon water flow system provided by the present application reduces the amount of air brought in when the liquid enters the U-shaped water inlet pipe through the spiral water chute, reduces the probability of generating bubbles in the U-shaped water inlet pipe, and further reduces the probability of air entering the siphon, ensuring the normal operation of the siphon function of the siphon water flow system.

[0027] The siphon water flow system provided by the present application introduces the liquid from the outside of the U-shaped water inlet pipe into the U-shaped water inlet pipe by using the spiral water chute, and uses the spiral blade with an inclined angle on the spiral water chute to slide the liquid into the U-shaped water inlet pipe, avoiding the strong impact on the water seal liquid level caused by the vertical drop of the liquid, and avoiding the formation of bubbles in the existing liquid in the U-shaped water inlet pipe, thereby reducing the amount of air introduced into the liquid during the liquid entry process.

[0028] The additional aspects and advantages of the present application will be partially given in the following description, which will become apparent from the following description, or will be understood through the practice of the present application. Description of the Drawings

[0029] The above and / or additional aspects and advantages of the invention of the present application will become apparent and be readily understood from the following description of embodiments in conjunction with the accompanying drawings, in which:

[0030] Figure 1 FIG. 4 is a schematic structural diagram of a siphon water flow system provided in an embodiment of the present application.

[0031] Figure 2 FIG. 5 is a schematic structural diagram of a spiral water chute provided in an embodiment of the present application.

[0032] Figure 3 FIG. 6 is a schematic structural diagram of a spiral water chute provided in another embodiment of the present application, which mainly shows that a water baffle is arranged on one side of the spiral blade away from the vertical central column.

[0033] Figure 4 FIG. 7 is a schematic structural diagram of a spiral water chute provided in another embodiment of the present application, which mainly shows that the vertical central column is a vertically through pipe and air outlet holes are provided on the vertically through pipe.

[0034] Figure 5 FIG. 8 is a schematic diagram of a spiral water chute placed in a U-shaped water inlet pipe provided in an embodiment of the present application.

[0035] Figure 6 FIG. 9 is a schematic diagram of a spiral water chute placed in a U-shaped water inlet pipe provided in another embodiment of the present application, which mainly shows that the outer edge of the spiral blade is lower than the inner edge height of the spiral blade.

[0036] Description of reference numerals in the drawings:

[0037] Siphon - 10, U-shaped water inlet pipe - 11, water outlet pipe - 12, connecting pipe - 13, spiral water chute - 20, vertical central column - 21, spiral blade - 22, air outlet hole - 23, water baffle - 24, overflow tank - 30. Detailed description of the embodiments

[0038] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for explaining the present application and should not be construed as limiting the present application.

[0039] The present application first provides a siphon water flow system, which can avoid introducing air during the process of liquid flowing into the siphon, and is beneficial to ensuring the normal function of the siphon function of the siphon.

[0040] For the schematic structural diagram of the siphon water flow system provided in an embodiment of the present application, please refer to Figure 1 , the siphon water flow system provided by the present application includes:

[0041] Siphon 10, the siphon 10 includes a U-shaped water inlet pipe 11, a water outlet pipe 12 and a communicating pipe 13 connecting the U-shaped water inlet pipe and the water outlet pipe;

[0042] Spiral water distributor 20, the spiral water distributor 20 is arranged in the U-shaped water inlet pipe 11, and the liquid flows through the spiral guiding path on the spiral water distributor 20;

[0043] Overflow tank 30, the water outlet pipe 12 of the siphon 10 is inserted into the overflow tank 30.

[0044] Among them, the liquid provided in this application includes: water, medicine, mixed liquid, etc. The liquid flows into the spiral water distributor 20 from the water inlet of the siphon, and flows into the U-shaped water inlet pipe 11 of the siphon along the spiral guiding path on the spiral water distributor 20. The U-shaped water inlet pipe is easy to form a liquid seal liquid level. The water outlet pipe is inserted below the liquid level in the overflow tank to prevent air from entering the communicating pipe of the siphon from the water outlet pipe. Among them, the spiral water distributor 20 can slow down the liquid flow rate, reduce the amount of air carried by the liquid into the siphon 10, and avoid air entering the siphon 10 through the U-shaped water inlet pipe 11. Under the siphon effect, the liquid enters the overflow tank 30 through the water outlet pipe 12 of the siphon 10, so that the liquid levels in the U-shaped water inlet pipe 11 and the overflow tank 30 are kept the same.

[0045] The siphon water flow system provided in this application reduces or even eliminates the amount of air introduced into the U-shaped water inlet pipe through the liquid by means of a spiral water distributor, reduces the probability of generating bubbles in the U-shaped water inlet pipe, and further reduces the probability of air entering the siphon, ensuring the normal operation of the siphon function.

[0046] The solution provided in this application can be applied in the RPIR (Rapid Purification of sewage using sedimentation Integrated rectangular airlift loop Reactor, sewage rapid purification technology of coupled sedimentation rectangular airlift loop reactor) module (or aerobic three-phase separator). When the RPIR adopts the upper water outlet mode, the siphon water flow system can be utilized. The water outlet overflow tank of each RPIR module is connected to the U-shaped water inlet pipe of the siphon. The water outlet of the RPIR module drops into the U-shaped water inlet pipe of the siphon through the overflow tank. The water outlets of multiple RPIR modules are connected in parallel to form an overall siphon water flow system. The solution provided in this application introduces the siphon water flow system corresponding to a single RPIR module.

[0047] Among them, the structural schematic diagram of the spiral water distributor 20 is as Figure 2As shown in the figure, it includes: a vertical central column 21 and a spiral blade 22. The spiral blade 22 is arranged on the vertical central column 21 to enable the liquid to flow through the spiral diversion path formed by the spiral blade 22.

[0048] The liquid enters the lower container through the bottom end of the spiral blade. The spiral blade extends the path length of the liquid from the water inlet to the lower part of the container. The liquid flows downward through the spiral diversion path formed by the spiral blade, greatly reducing the speed of the liquid flowing into the container, slowing down the impact of the liquid falling on the bottom of the container, and avoiding the problem of generating a large number of bubbles in the liquid due to the vertical drop of the liquid into the lower container. Under the extrusion of the liquid, a part of the air above the liquid level in the container flows upward along the central column in the opposite direction of the liquid flow direction, thus solving the problem of bringing too much air into the liquid in the container when the liquid vertically flows into the container.

[0049] It should be noted that in the present application, the outer edge of the provided spiral blade is the edge far from the vertical central column, and the inner edge of the spiral blade is the edge close to the vertical central column. The central column provided in the present application is a solid column.

[0050] In order to facilitate the liquid to smoothly flow along the spiral diversion path formed by the spiral blade, in the solution provided by an embodiment of the present application, the height of the outer edge of the spiral blade is set higher than the height of the inner edge. Then, the liquid on the spiral blade converges towards the vertical central column and flows into the U-shaped water inlet pipe along the spiral diversion path formed by the spiral blade and the vertical central column.

[0051] The structural schematic diagram of a spiral water chute provided by an embodiment is as Figure 3 shown. A water baffle 24 is arranged on the side of the spiral blade far from the vertical central column. The trend of the water baffle is consistent with the trend of the spiral blade. The height of the water baffle is set according to specific circumstances, and the height of the water baffle does not exceed the pitch of the spiral blade. In the case where the water baffle is provided, the height of the outer edge of the spiral blade can be set to be the same as the height of the inner edge, or the outer edge and the inner edge of the spiral blade can be set to different heights.

[0052] The width of the liquid flow is limited by the vertical central column and the water baffle, and the liquid flows through the spiral channel formed by the spiral blade, the vertical central column and the water baffle to the U-shaped water inlet pipe.

[0053] In one embodiment, the height of the starting end of the spiral blade is lower than the height of the top end of the vertical central column. In this way, the vertical central column can serve as a water baffle on the inner edge side of the spiral blade, and the liquid flows through the spiral diversion channel formed by the vertical central column and the spiral blade.

[0054] In one embodiment, the bottom height of the water outlet end of the spiral blade is not higher than the bottom height of the vertical central column. This setting includes the following two cases: First, the bottom height of the water outlet end of the spiral blade is the same as the bottom height of the vertical central column, that is, the liquid falls into the container along the spiral direction of the spiral blade; Second, the bottom height of the water outlet end of the spiral blade is lower than the bottom height of the vertical central column, that is, there are two water surfaces for the liquid, one is the surface in the extending direction of the spiral blade, and the other is the surface of the spiral blade close to the vertical central column.

[0055] The bottom end of the spiral water flow guide is the lowest end of the overall spiral water flow guide. The bottom end corresponding to the first case is the bottom end of the vertical central column, and the bottom end corresponding to the second case is the bottom end of the spiral blade.

[0056] In the solution provided by the embodiment of the present application, the length of the spiral blade is extended, and the liquid enters the lower container through the bottom end of the spiral blade, further extending the path length of the liquid from the water inlet to the lower part of the container, slowing down the impact of the liquid falling on the bottom of the container, and effectively reducing the amount of air brought into the container when the liquid flows in.

[0057] The structural schematic diagram of the spiral water flow guide provided by an embodiment of the present application is as Figure 4 shown. The vertical central column is a vertically through pipe, and air circulates inside the vertically through pipe. The liquid falls into the container through the spiral blade, and the air in the container is discharged from the container through the channel of the vertically through pipe by atmospheric pressure.

[0058] Furthermore, as shown in Figure 4 , a preset number of air outlet holes 23 are opened below the connection position between the vertically through pipe and the spiral blade provided by the present application, so that the air entering the container along the spiral blade can enter the vertically through pipe through the air outlet holes on the vertically through pipe during the falling process and finally be discharged from the upper end of the vertically through pipe.

[0059] Preferably, the air outlet holes opened on the vertically through pipe are evenly distributed, so that the air carried by the liquid can enter the vertically through pipe evenly through the air outlet holes, which is beneficial to improving the rate of discharging the air carried by the liquid and reducing the probability of air entering the bottom of the container.

[0060] Preferably, the air outlet holes opened on the vertically through pipe are evenly distributed along the distribution direction of the spiral blade. That is to say, the distribution mode of the air outlet holes on the vertically through pipe is the same as the trend of the spiral blade. This way can further improve the rate of air discharging from the container and further reduce the probability of air entering the bottom of the container.

[0061] The solution provided by the above embodiment can effectively reduce the amount of air brought into the container when the liquid enters. After a large number of explorations, the inventor of the present application provides the following preferred solution to further optimize the effect of the spiral water flow guide.

[0062] In one embodiment, the pitch of the spiral blade is 100 mm - 400 mm. That is, when the pitch of the spiral blade is within this range, the air brought in during the liquid flowing into the U-shaped water inlet pipe can be minimized. The pitch of the spiral blade can be any value within this range, such as: 100 mm, 150 mm, 200 mm, 300 mm, 400 mm, etc.

[0063] Assuming that the spiral blade corresponding to one pitch is a helix, then the number of helices can be set according to the length of the vertical central column, which is not limited here.

[0064] In one embodiment, the ratio range of the outer diameter of the spiral of the spiral blade to the inner diameter of the vertical through pipe is 2 - 10. Specifically, when the ratio of the outer diameter of the spiral to the inner diameter of the vertical through pipe is within the range of 2:1 to 10:1, the air in the U-shaped water inlet pipe can be discharged from the container fastest. The ratio of the outer diameter of the spiral to the inner diameter of the vertical through pipe can be 2:1, 3:1, 5:1, 8:1, etc.

[0065] Figure 5 FIG. 5 is a schematic diagram of the spiral water flow device provided for one embodiment placed in the U-shaped water inlet pipe. FIG. 5 also shows the flow paths of the liquid and air. Among them, the bottom end of the spiral water flow device is placed at a preset distance above the liquid seal liquid level of the U-shaped water inlet pipe. When the liquid in the U-shaped water inlet pipe is water, the liquid seal liquid level is the water seal liquid level. Hereinafter, the water seal liquid level will be taken as an example for description. The water inlet of the U-shaped water inlet pipe is connected to the water inlet end of the spiral blade of the spiral water flow device, and the two can be connected in a fixed or detachable manner. The liquid flows into the water inlet end of the spiral water flow device through the water inlet of the U-shaped water inlet pipe, flows along the spiral guiding path formed by the spiral blade, and enters the U-shaped water inlet pipe for receiving the liquid from the water outlet end of the spiral blade.

[0066] The siphon water flow system provided by the present application uses a spiral water flow device to introduce liquid from the outside of the U-shaped water inlet pipe into the U-shaped water inlet pipe. The spiral blade with an inclined angle on the spiral water flow device slides the liquid into the U-shaped water inlet pipe, avoiding the strong impact on the water seal liquid level caused by the vertical drop of the liquid and avoiding the formation of bubbles in the liquid in the U-shaped water inlet pipe, thereby reducing the amount of air introduced into the siphon during the liquid entry.

[0067] Further, the outer diameter of the spiral of the spiral water distributor is adapted to the inner diameter of the U-shaped water inlet pipe, that is, the outer diameter of the spiral of the spiral water distributor is equal to or slightly smaller than the inner diameter of the U-shaped water inlet pipe. When the outer diameter of the spiral is equal to the inner diameter of the U-shaped water inlet pipe, the outer edge of the spiral water distributor is in contact with the inner wall of the U-shaped water inlet pipe. When the outer diameter of the spiral is slightly smaller than the inner diameter of the U-shaped water inlet pipe, for example, in the same horizontal direction, the distance between the spiral water distributor and the U-shaped water inlet pipe is less than 2 mm of the outer diameter of the spiral. The vertical central column of the spiral water distributor serves as a water baffle on one side, and the inner wall of the U-shaped water inlet pipe serves as a water baffle on the other side. The two water baffles and the spiral blades form a liquid flow path.

[0068] A schematic diagram of the spiral water distributor provided in another embodiment of the present application placed in the U-shaped water inlet pipe is as Figure 6 shown, which highlights that in the horizontal direction, the outer edge of the spiral blade is lower than the inner edge of the spiral blade, and the inner wall of the U-shaped water inlet pipe and the outer edge of the spiral blade form a spiral guiding path, and the solution flows into the U-shaped water inlet pipe through the spiral guiding path.

[0069] Combined with Figure 2-6 shown, the liquid enters the U-shaped water inlet pipe along the above-mentioned flow path. The air carried by the liquid into the interior of the U-shaped water inlet pipe is squeezed by the liquid and discharged from the U-shaped water inlet pipe along the opposite direction of the liquid flow direction through at least one of the interior of the vertical through pipe or the air outlet holes opened on the vertical through pipe, achieving the purpose of reducing the entry of air during the process of the liquid flowing into the U-shaped water inlet pipe.

[0070] Specifically, the liquid enters the U-shaped water inlet pipe along the flow path composed of the vertical central column, the spiral blades and the inner wall of the U-shaped water inlet pipe. The air in the U-shaped water inlet pipe is squeezed by the inflowing liquid and flows in the opposite direction of the liquid inflow direction, that is, discharges from the U-shaped water inlet pipe against the direction of the spiral blades. The air flow direction in the U-shaped water inlet pipe is as Figure 5 、 6 shown by the dashed arrows, and the liquid flow direction is as Figure 5 、 6 shown by the solid arrows.

[0071] In the solution where the vertical central column provided in the present application is a vertical through pipe and air outlet holes are opened on the vertical through pipe, part of the air entering the U-shaped water inlet pipe together with the liquid can enter the through pipe of the vertical through pipe through the air outlet holes opened on the vertical through pipe during the inflow process and be discharged, and part of the air is discharged from the U-shaped water inlet pipe through the bottom of the vertical through pipe into the through pipe of the vertical through pipe after leaving the spiral water distributor at the water outlet end of the spiral blade.

[0072] In the siphon water flow system provided by the present application, the bottom end of the spiral water chute is suspended above the water seal liquid level of the U-shaped water inlet pipe, preventing the bottom end of the through pipe of the water chute from being submerged below the water seal liquid level and thus unable to achieve the purpose of discharging air through the vertical through pipe of the spiral water chute.

[0073] The spiral water chutes with various structural forms provided in the above embodiments can all be used in the U-shaped water inlet pipe of the siphon water flow system provided by the present application. That is to say, the present application also provides a U-shaped water inlet pipe corresponding to the structural form of the spiral water chute.

[0074] In one embodiment, the bottom end position of the spiral water chute should be higher than the liquid level height of the overflow tank to ensure that the bottom of the spiral water chute is suspended above the water seal liquid level of the U-shaped water inlet pipe, so as not to affect the function of the spiral water chute in discharging air.

[0075] Through the siphon water flow system provided by the above embodiments of the present application, the amount of air brought into the bottom of the U-shaped water inlet pipe during the process of liquid entering the U-shaped water inlet pipe is reduced. After the liquid enters the U-shaped water inlet pipe, it remains in the U-shaped water inlet pipe. By using such a U-shaped water inlet pipe, the gas content of the liquid in the U-shaped water inlet pipe can be reduced, avoiding the release of air bubbles in the siphon pipe, which is beneficial to ensuring the normal siphon function of the siphon pipe.

[0076] On this basis, the present application also provides a drainage method, which adopts the siphon water flow system provided by any of the above technical solutions. The drainage method includes:

[0077] Previously, make the siphon water flow system in a full water state to meet the siphon condition;

[0078] Inject liquid through the water inlet hole of the U-shaped water inlet pipe;

[0079] The liquid enters the U-shaped water inlet pipe of the siphon pipe along the spiral guiding path of the spiral water chute;

[0080] When the liquid level height in the U-shaped water inlet pipe is higher than the liquid level height in the overflow tank, under the action of the siphon effect, the liquid enters the overflow tank through the siphon pipe so that the liquid level height in the U-shaped water inlet pipe is consistent with the liquid level height in the overflow tank.

[0081] Before using the siphon water flow system provided by the present application, first make the siphon water flow system in a full water state, that is, the connecting pipe of the siphon pipe is filled with water and there is no air remaining, meeting the siphon condition.

[0082] Through the siphon water flow system provided by the above solution, the drainage process can be carried out in the following way: Water flows into the spiral water distributor from the water inlet of the U-shaped water inlet pipe of the siphon. It flows into the U-shaped water inlet pipe of the siphon through the spiral blades of the spiral water distributor. The air in the U-shaped water inlet pipe is discharged through the spiral blades of the spiral water distributor, the vertical through pipe and / or the air outlet holes opened on the through pipe. The liquid level in the U-shaped water inlet pipe rises, and the water seal liquid level in the U-shaped water inlet pipe is higher than the liquid level of the overflow tank. Under the siphon effect, the liquid enters the connecting pipe and enters the overflow tank through the water outlet pipe of the siphon. The overflow tank discharges a corresponding volume of water so that the water seal liquid level in the U-shaped water inlet pipe is consistent with the liquid level in the overflow tank.

[0083] The drainage method provided by this application reduces the amount of air introduced into the U-shaped water inlet pipe due to the entry of liquid through the spiral water distributor, reduces the probability of generating bubbles in the U-shaped water inlet pipe, and further reduces the probability of air entering the siphon, ensuring the normal operation of the siphon function.

[0084] Furthermore, this application also provides a sewage treatment system, which includes: a sewage treatment device and the siphon water flow system described in any of the above technical solutions. The sewage treatment device is connected to the siphon water flow system.

[0085] Specifically, the sewage treatment device includes a reaction unit and a sludge-water separation unit. A clear water overflow tank is arranged in the sludge-water separation unit. The sewage is subjected to a purification reaction treatment in the reaction unit of the sewage treatment device, and then after being treated by the sludge-water separation unit, the separated liquid enters the clear water overflow tank.

[0086] The clear water overflow tank is connected to the spiral water distributor in the siphon water flow system, and the separated liquid enters the siphon from the clear water overflow tank through the spiral water distributor, reducing the amount of air brought into the siphon by the separated liquid.

[0087] Among them, the sewage treatment device can be any one of the following devices: a reaction precipitation integrated air-lift loop bioreactor, a contact oxidation tank, an aerobic three-phase separator, a clarifier and other sewage treatment devices.

[0088] The above are only some embodiments of this application. It should be noted that for those of ordinary skill in the art, without departing from the principle of this application, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of this application.

Claims

1. A siphon water flow system, characterized in that, it includes: A siphon tube, which includes a U-shaped water inlet pipe, a water outlet pipe, and a connecting pipe connecting the U-shaped water inlet pipe and the water outlet pipe; A spiral water flow device, which is arranged in the U-shaped water inlet pipe, and the liquid flows through the spiral flow guiding path on the spiral water flow device; An overflow tank, and the water outlet pipe of the siphon tube is inserted into the overflow tank; The bottom end of the spiral water flow device is suspended above the water seal liquid level of the U-shaped water inlet pipe; The spiral water flow device includes: A vertical central column; Spiral blades, which are arranged on the vertical central column to enable the liquid to flow through the spiral flow guiding path formed by the spiral blades; The vertical central column is a vertically through pipe.

2. The siphon water flow system according to claim 1, characterized in that, the outer diameter of the spiral of the spiral water flow device is adapted to the inner diameter of the U-shaped water inlet pipe of the siphon tube.

3. The siphon water flow system according to claim 1, characterized in that, a preset number of air holes are opened below the connection position of the vertically through pipe and the spiral blades.

4. The siphon water flow system according to claim 1, characterized in that, the height of the starting end of the spiral blade is lower than the height of the top end of the vertical central column.

5. A drainage method, characterized in that, it adopts the siphon water flow system provided in any one of claims 1 to 4; the drainage method includes: Previously making the siphon water flow system in a full water state to meet the siphon condition; Injecting liquid through the U-shaped water inlet pipe; The liquid enters the U-shaped water inlet pipe of the siphon tube along the spiral flow guiding path of the spiral water flow device; When the liquid level height in the U-shaped water inlet pipe is higher than the liquid level height in the overflow tank, under the action of the siphon effect, the liquid enters the overflow tank through the connecting pipe of the siphon tube.

6. A sewage treatment system, characterized in that, it includes: A sewage treatment device and the siphon water flow system according to any one of claims 1 to 4 above, and the sewage treatment device is connected to the siphon water flow system.

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