Unpowered constant-water-level perpetual-motion sewage backflow device

Abstract

The utility model relates to the technical field of energy conservation of sewage treatment, and provides an unpowered constant-water-level perpetual sewage backflow device which is characterized in that a negative-pressure water tank is arranged above a stock solution pool and a backflow pool; the interior of the negative-pressure water tank is divided into a backflow liquid inlet cavity, a backflow liquid discharge cavity and a steady-flow water seal cavity by means of a first partition plate, the steady-flow water seal cavity is located between the backflow liquid inlet cavity and the backflow liquid discharge cavity, and an upper flow guide channel is reserved between the upper end of the first partition plate and the negative-pressure water tank; the upper end of the liquid inlet pipe is communicated with the backflow liquid inlet cavity, and the lower end of the liquid inlet pipe is used for extending into the stock solution pool; the one-way check valve is arranged on the liquid inlet pipe; the upper end of the backflow pipe is communicated with the backflow drainage cavity, and the lower end of the backflow pipe extends into the backflow pool; and the backflow regulating valve is arranged on the backflow pipe. Through the implementation of the technical scheme, the traditional mode that nitrification liquid backflow and sludge backflow are achieved only through the suction effect of a power water pump in related conventional processes is changed, and the problem that energy consumption is large in the process operation process is thoroughly solved.

Description

Technical Field

[0001] The utility model relates to the technical field of energy-saving sewage treatment, and in particular to a non-powered constant water level perpetual motion sewage return device. Background Art

[0002] In wastewater treatment processes, nitrification solution return and sludge return are two key steps in the activated sludge process. Nitrification solution return primarily involves returning nitrification solution containing nitrates from the secondary biological treatment unit (usually an aerobic tank) to the anoxic tank (usually an anoxic tank). This process promotes denitrification, reducing nitrates to nitrogen gas, thereby removing nitrogen from the wastewater. Sludge return involves returning a portion of the activated sludge after sedimentation and separation to the biological treatment unit (such as an aeration tank) to maintain the microbial concentration within the biological treatment unit. Currently, two common return methods are used: the traditional method of returning nitrification solution and sludge through the suction action of a powered water pump; and the gas lift method of returning nitrification solution and sludge. The first return method suffers from high energy consumption and the need for maintenance and management. The second type is that the air lift power comes from the fan aeration capacity, which requires the consumption of fan aeration energy to achieve air lift reflux. Therefore, the reflux is unstable, and the reflux water volume is difficult to accurately control, requiring maintenance, etc. Utility Model Content

[0003] The utility model proposes a non-powered constant water level perpetual sewage return device, which changes the traditional method of related conventional processes in which nitrification liquid return and sludge return are achieved only through the suction action of a power water pump and air lifting, and completely solves the problems of high energy consumption, unstable reflux volume, inability to accurately control, and maintenance requirements during process operation.

[0004] The technical solution of the utility model is as follows: a non-powered constant water level perpetual sewage reflux device, which is used to be arranged between the raw liquid pool and the reflux pool, and the key points are: including:

[0005] A negative pressure water tank, which is used to be arranged above the raw liquid tank and the reflow tank;

[0006] a first partition plate, the first partition plate being arranged in the negative pressure water tank, the number of the first partition plates being two, the interior of the negative pressure water tank being divided into a reflux liquid inlet chamber, a reflux liquid discharge chamber, and a steady flow water seal chamber by means of the first partition plate, the reflux liquid inlet chamber being located above the raw liquid pool, the reflux liquid discharge chamber being located above the reflux pool, the steady flow water seal chamber being located between the reflux liquid inlet chamber and the reflux liquid discharge chamber, and an upper guide channel being left between the upper end of the first partition plate and the negative pressure water tank;

[0007] a liquid inlet pipe, wherein the upper end of the liquid inlet pipe is communicated with the reflux liquid inlet cavity, and the lower end of the liquid inlet pipe is used to extend into the raw liquid pool and is located below the liquid level in the raw liquid pool;

[0008] A one-way check valve is provided on the liquid inlet pipe to prevent the liquid from flowing back;

[0009] a reflux pipe, the upper end of which is in communication with the reflux drainage cavity, and the lower end of which is configured to extend into the reflux pool and be located above the liquid level in the reflux pool;

[0010] A reflux regulating valve is provided on the reflux pipe.

[0011] It also includes a second partition plate, which is arranged in the negative pressure water tank and located in the steady flow water seal cavity, and a lower guide channel is left between the lower end of the second partition plate and the negative pressure water tank.

[0012] The volume of the reflux drainage chamber is V1, the volumes of the reflux inlet chamber and the steady flow water seal chamber are both V2, and V1>(3-5)V2.

[0013] One end of the reflux pipe connected to the reflux drainage cavity is vertically and spirally designed.

[0014] It also includes a water replenishing valve, which is arranged on the negative pressure water tank and is connected to the steady flow water sealing cavity.

[0015] It also includes a siphon breaking valve, which is arranged on the negative pressure water tank and is connected to the steady flow water seal chamber.

[0016] It also includes a reflux flow meter, which is arranged on the reflux pipe.

[0017] Also includes,

[0018] A manhole is provided on the negative pressure water tank and is located at the top of the negative pressure water tank;

[0019] A sealing cover plate is sealingly arranged at the manhole, and the sealing cover plate and the manhole are detachably connected.

[0020] One side of the sealing cover plate is hinged to the manhole, and further includes:

[0021] A positioning frame, wherein the positioning frame is arranged on the manhole, and the number of the positioning frames is multiple, and all the positioning frames are arranged along the circumferential direction around the periphery of the manhole;

[0022] a positioning rod, the positioning rod being arranged on the positioning frame and hinged to the positioning frame;

[0023] a screw, wherein the lower end of the screw is rotatably connected to the positioning rod, and when the positioning rod rotates, the upper end of the screw reaches above the sealing cover plate;

[0024] A nut, the nut being threadedly connected to the screw, the nut having a notch on the lower end surface facing the sealing cover plate, the side wall of the notch contacting the outer side wall of the sealing cover plate after the positioning rod rotates, the nut descending after the screw rotates, and the upper end surface of the notch contacting the upper end surface of the sealing cover plate.

[0025] Also includes,

[0026] a first positioning sleeve, which is disposed in the raw liquid pool and sleeved around the outer periphery of the liquid inlet pipe;

[0027] A second positioning sleeve is provided in the reflux pool and is sleeved on the periphery of the reflux pipe.

[0028] The working principle and beneficial effects of the utility model are as follows: the negative pressure water tank is used to be arranged above the raw liquid pool and the reflux pool; the first partition plate is arranged in the negative pressure water tank, the number of the first partition plates is two, and the interior of the negative pressure water tank is divided into a reflux liquid inlet chamber, a reflux liquid discharge chamber and a steady flow water seal chamber by means of the first partition plate, the reflux liquid inlet chamber is located above the raw liquid pool, the reflux liquid discharge chamber is located above the reflux pool, and the steady flow water seal chamber is located between the reflux liquid inlet chamber and the reflux liquid discharge chamber, and an upper guide channel is left between the upper end of the first partition plate and the negative pressure water tank; the upper end of the liquid inlet pipe is connected with the reflux liquid inlet chamber, and the lower end of the liquid inlet pipe is used to extend into the raw liquid pool and is located below the liquid level in the raw liquid pool; a one-way check valve is arranged on the liquid inlet pipe to prevent the liquid from flowing back; the upper end of the reflux pipe is connected with the reflux liquid discharge chamber, and the lower end of the reflux pipe is used to extend into the reflux pool and is located above the liquid level in the reflux pool; the reflux regulating valve is arranged on the reflux pipe.

[0029] The one-way check valve can prevent the water in the reflux liquid inlet chamber from flowing back into the original liquid pool. When in use, first extend the lower end of the liquid inlet pipe to below the liquid level in the original liquid pool, and the lower end of the reflux pipe is above the liquid level in the reflux pool. Close the reflux regulating valve, fill water into the negative pressure water tank, and fill the reflux liquid inlet chamber, the steady flow water seal chamber and the reflux drainage chamber with water. Then open the reflux regulating valve. The water in the reflux drainage chamber flows into the reflux pool through the reflux pipe and the reflux regulating valve under the action of gravity. When the water level in the reflux drainage chamber drops, negative pressure will be formed in the negative pressure water tank, resulting in a siphon effect, prompting the liquid in the original liquid pool to enter the reflux liquid inlet chamber through the liquid inlet pipe and the one-way check valve, and then flow into the reflux drainage chamber through the steady flow water seal chamber and the upper guide channel, and finally flow into the reflux pool through the reflux pipe and the reflux regulating valve. The utility model utilizes the principles of gravity and negative pressure to realize the reflux of nitrification liquid and sludge in the sewage treatment process, which can reduce the demand for additional power equipment and lower energy consumption. The reflux volume is stable and can be precisely controlled without maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The preferred embodiments will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present invention.

[0031] Figure 1 It is a schematic diagram of the internal structure of the utility model.

[0032] Figure 2 This is a schematic diagram of the external structure of the utility model.

[0033] Figure 3 It is a schematic diagram of the connection structure between the sealing cover plate and the manhole in the utility model.

[0034] Figure 4 This is a schematic diagram of the connection structure between multiple liquid inlet pipes and the reflux liquid inlet cavity in the present invention.

[0035] Figure 5 This is a schematic diagram of the connection structure between multiple liquid inlet pipes and the reflux liquid inlet cavity in the present invention.

[0036] In the figure: 1. negative pressure water tank, 2. first partition plate, 3. liquid inlet pipe, 4. one-way check valve, 5. reflux pipe, 6. reflux regulating valve, 7. reflux liquid inlet chamber, 8. reflux liquid discharge chamber, 9. steady flow water sealing chamber, 10. upper guide channel, 11. second partition plate, 12. lower guide channel, 13. water supply valve, 14. siphon breaking valve, 15. reflux flow meter, 16. manhole, 17. sealing cover, 18. positioning frame, 19. positioning rod, 20. screw, 21. nut, 22. notch, 23. first positioning sleeve, 24. second positioning sleeve, 25. raw liquid pool, 26. reflux pool. DETAILED DESCRIPTION

[0037] 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 drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without inventive work.

[0038] To simplify the drawings, only the parts relevant to the utility model are schematically shown in each figure; they do not represent the actual structure of the product. Furthermore, to simplify the drawings and facilitate understanding, in some figures, only one of the components with the same structure or function is schematically shown or labeled. In this document, "one" not only means "only one" but also "more than one," and "several" includes "two" and "more than two."

[0039] It should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0040] 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.

[0041] Example, see Figure 1~Figure 2, is an embodiment of the utility model, which proposes a non-powered constant water level perpetual sewage reflux device for being arranged between the raw liquid pool 25 and the return pool 26, including a negative pressure water tank 1, a first partition plate 2, a liquid inlet pipe 3, a one-way check valve 4, a return pipe 5, and a return regulating valve 6. The negative pressure water tank 1 is used to be arranged above the raw liquid pool 25 and the return pool 26; the first partition plate 2 is arranged in the negative pressure water tank 1, and the number of the first partition plates 2 is two. The interior of the negative pressure water tank 1 is divided into a reflux liquid inlet chamber 7, a reflux liquid discharge chamber 8 and a steady flow water seal chamber 9 by means of the first partition plate 2. The reflux liquid inlet chamber 7 is located above the raw liquid pool 25, and the reflux liquid discharge chamber 8 is located above the raw liquid pool 26. The liquid chamber 8 is located above the reflux pool 26, the steady flow water seal chamber 9 is located between the reflux liquid inlet chamber 7 and the reflux liquid discharge chamber 8, and an upper guide channel 10 is left between the upper end of the first partition plate 2 and the negative pressure water tank 1; the upper end of the liquid inlet pipe 3 is connected with the reflux liquid inlet chamber 7, and the lower end of the liquid inlet pipe 3 is used to extend into the original liquid pool 25 and is located below the liquid level in the original liquid pool 25; the one-way check valve 4 is arranged on the liquid inlet pipe 3 to prevent the incoming liquid from flowing back; the upper end of the reflux pipe 5 is connected with the reflux liquid discharge chamber 8, and the lower end of the reflux pipe 5 is used to extend into the reflux pool 26 and is located above the liquid level in the reflux pool 26; the reflux regulating valve 6 is arranged on the reflux pipe 5.

[0042] In this embodiment, the negative pressure water tank is used to provide a negative pressure environment. The first partition plate 2 is used to separate the internal space of the negative pressure water tank 1. The one-way check valve 4 can prevent the water in the reflux liquid chamber 7 from flowing back into the original liquid pool 25. When in use, first extend the lower end of the liquid inlet pipe 3 below the liquid level in the original liquid pool 25, and the lower end of the reflux pipe 5 is located above the liquid level in the reflux pool 26. Close the reflux regulating valve 6, and fill water into the negative pressure water tank 1 to fill the reflux liquid chamber 7, the steady flow water sealing chamber 9 and the reflux drainage chamber 8 with water, and then open the reflux regulating valve 6. When the reflux regulating valve 6 is opened, the water in the reflux drainage chamber 8 flows into the reflux tank 26 through the reflux pipe 5 and the reflux regulating valve 6 under the action of gravity. When the water level in the reflux drainage chamber 8 drops, a negative pressure is formed in the negative pressure water tank 1, generating a siphon effect, which causes the liquid in the original liquid pool 25 to enter the reflux inlet chamber 7 through the liquid inlet pipe 3 and the one-way check valve 4, and then flows into the reflux drainage chamber 8 through the steady flow water seal chamber 9 and the upper guide channel 10, and finally flows into the reflux tank 26 through the reflux pipe 5 and the reflux regulating valve 6. The utility model utilizes the principles of gravity and negative pressure to achieve nitrification liquid reflux and sludge reflux in the sewage treatment process, which can reduce the need for additional power equipment and achieve unpowered (i.e., no power water pump is required), constant water level (the water level remains constant), perpetual motion (can operate uninterruptedly for a long time) reflux, which can reduce energy consumption, stabilize the reflux volume, can be precisely controlled, and does not require maintenance. The reflux regulating valve 6 not only plays a switching role, but can also be used to adjust the liquid flow in the reflux pipe 5 by adjusting the opening of the reflux regulating valve 6 to meet different process requirements.

[0043] Special instructions are required: Figure 4 and Figure 5As shown, according to the process requirements, the liquid inlet pipe 3 at the lower end of the reflux liquid inlet chamber 7 of the utility model can be set to one, two, three or more, and each liquid inlet pipe 3 is also equipped with a one-way check valve 4. The reflux drainage chamber 8 is also equipped with the same number of reflux pipes 5 as the liquid inlet pipe 3, so as to achieve the purpose and application effect of large water volume, multiple points, and one-point reflux and multiple-point reuse. There are two first partition plates 2, of which the height of the first partition plate 2 arranged between the reflux drainage chamber 8 and the steady flow water seal chamber 9 is lower than the height of the first partition plate 2 arranged between the steady flow water seal chamber 9 and the reflux liquid inlet chamber 7, and the actual height is the diameter of the liquid inlet pipe 3. The end of the reflux pipe 5 connected to the reflux drainage chamber 8 is a vertical, spiral design, which can increase the gravitational acceleration of the water flow. The volume setting of the negative pressure water tank 1 of this device needs to be determined according to the amount of reflux water.

[0044] Furthermore, if Figure 1 and Figure 2 As shown, the system also includes a second partition plate 11, which is disposed within the negative pressure water tank 1 and within the steady-flow water seal chamber 9. A lower guide channel 12 is provided between the lower end of the second partition plate 11 and the negative pressure water tank 1. The second partition plate 11 is used to further separate the water flow, while the lower guide channel 12 is used for liquid circulation. Controlling the liquid flow path through the lower guide channel 12 helps maintain a more stable water seal state, thereby improving the stability and efficiency of the system. The second partition plate 11 is located at the center between the two first partition plates 2, dividing the steady-flow water seal chamber 9 into two equal parts.

[0045] Furthermore, if Figure 1 and Figure 2 As shown, the volume of the reflux drainage chamber 8 is V1, and the volumes of the reflux inlet chamber 7 and the steady flow water seal chamber 9 are both V2, with V1 > (3-5) V2. This allows a sufficiently large negative pressure to be generated in the reflux drainage chamber 8, resulting in a better reflux effect.

[0046] Furthermore, if Figure 1 and Figure 2 As shown, the device also includes a water supply valve 13, which is installed on the negative pressure water tank 1 and communicates with the steady-flow water seal chamber 9. Connecting the water supply valve 13 to an external water supply device allows water to be added to the negative pressure water tank 1. This simple structure and convenient operation are key features. It should be noted that the water supply valve 13 only needs to be opened to fill the negative pressure water tank 1 when the device is first activated.

[0047] Furthermore, if Figure 1 and Figure 2 As shown, the siphon breaking valve 14 is also included. The siphon breaking valve 14 is arranged on the negative pressure water tank 1 and is connected to the steady flow water seal chamber 9. When needed, the siphon breaking valve 14 can be opened to destroy the siphon effect, which is convenient for inspection and maintenance.

[0048] Furthermore, if Figure 1As shown, a reflux flowmeter 15 is also included. The reflux flowmeter 15 is arranged on the reflux pipe 5 and can be used to measure the flow rate of the reflux liquid, so as to facilitate monitoring the operating status of the device.

[0049] Furthermore, if Figure 1 and Figure 2 As shown, the manhole 16 and the sealing cover 17 are also included. The manhole 16 is provided on the negative pressure water tank 1 and is located at the top of the negative pressure water tank 1. The sealing cover 17 is sealed at the manhole 16 and is detachably connected to the manhole 16. The manhole 16 is located at the top of the negative pressure water tank 1. By opening the sealing cover 17, inspection and maintenance can be carried out through the manhole 16, which is convenient for operation.

[0050] Furthermore, if Figure 3 As shown, one side of the sealing cover plate 17 is hinged to the manhole 16, and also includes a positioning frame 18, a positioning rod 19, a screw 20, and a nut 21. The positioning frame 18 is arranged on the manhole 16, and the number of the positioning frames 18 is multiple, and all the positioning frames 18 are arranged in a circumferential direction around the periphery of the manhole 16; the positioning rod 19 is arranged on the positioning frame 18 and is hinged to the positioning frame 18; the lower end of the screw rod 20 is rotatably connected to the positioning rod 19, and after the positioning rod 19 rotates, the upper end of the screw rod 20 reaches above the sealing cover plate 17; the nut 21 is threadedly connected to the screw 20, and a notch 22 is provided on the lower end surface of the nut 21 facing the sealing cover plate 17. After the positioning rod 19 rotates, the side wall of the notch 22 contacts the outer side wall of the sealing cover plate 17. After the screw 20 rotates, the nut 21 descends, and the upper end surface of the notch 22 contacts the upper end surface of the sealing cover plate 17.

[0051] Taking the hinged connection between the left side of the sealing cover plate 17 and the manhole 16 as an example, five positioning frames 18 are evenly arranged along the circumferential direction around the periphery of the manhole 16. The hinge axis between the sealing cover plate 17 and the manhole 16 is horizontally arranged and located between two adjacent positioning frames 18. The positioning rod 19 is horizontally arranged, and the lower end of the screw 20 is rotatably connected to the positioning rod 19 via a bearing. When the positioning rod 19 rotates, it can drive the screw 20 to rotate synchronously. When the screw 20 rotates, the positioning rod 19 will not rotate synchronously with the screw 20. The side wall of the notch 22 is an arc surface that matches the shape of the sealing cover plate 17. When the sealing cover plate 17 is pressed and sealed at the manhole 16, as shown in FIG. Figure 3As shown, when the sealing cover plate 17 needs to be opened, the screw rod 20 is rotated to raise the nut 21. After the nut 21 is separated from the sealing cover plate 17, the upper end of the screw rod 20 is flipped outward to prevent the nut 21 from affecting the flipping of the sealing cover plate 17. The right end of the sealing cover plate 17 can then be lifted upward to open the sealing cover plate 17. When the sealing cover plate 17 needs to be closed, the sealing cover plate 17 is first returned to the manhole 16, and then the screw rod 20 is flipped in the opposite direction so that the upper end of the screw rod 20 reaches above the sealing cover plate 17 and the side wall of the notch 22 on the nut 21 contacts the outer wall of the sealing cover plate 17. The screw rod 20 is rotated to lower the nut 21 until the upper end surface of the notch 22 on the nut 21 contacts the upper end surface of the sealing cover plate 17. The structure is simple, the connection is firm and reliable, the operation is convenient and fast, and it saves time and effort.

[0052] Furthermore, if Figure 1 As shown, the apparatus further includes a first positioning sleeve 23 and a second positioning sleeve 24. The first positioning sleeve 23 is disposed in the raw liquid reservoir 25 and is sleeved around the outer periphery of the liquid inlet pipe 3; the second positioning sleeve 24 is disposed in the return flow reservoir 26 and is sleeved around the outer periphery of the return flow pipe 5. The first positioning sleeve 23 is used to secure the liquid inlet pipe 3, and the second positioning sleeve 24 is used to secure the return flow pipe 5, thereby preventing the liquid inlet pipe 3 and the return flow pipe 5 from shaking and affecting the return flow effect.

[0053] Furthermore, the first positioning sleeve 23 is detachably connected to the liquid inlet pipe 3, and the second positioning sleeve 24 is detachably connected to the return pipe 5, so as to facilitate the disassembly and maintenance of the liquid inlet pipe 3 and the return pipe 5.

[0054] This technology is applicable to various types of sewage treatment processes, including nitrification solution and sludge return, and can be used as a non-powered water pumping device in regulating tanks. It can also be used in industrial circulating water applications. Another feature of this technology is that it can achieve single-point return and multiple-point reuse, meeting diverse process requirements.

[0055] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, and all of these should be included in the scope of the claims of the present invention.

Claims

1. A non-powered constant water level perpetual sewage return device, used to be arranged between the raw liquid tank (25) and the return tank (26), characterized by: include, A negative pressure water tank (1), the negative pressure water tank (1) being arranged above the raw liquid pool (25) and the reflow pool (26); a first partition plate (2), the first partition plate (2) being arranged in the negative pressure water tank (1), the number of the first partition plates (2) being two, the interior of the negative pressure water tank (1) being divided into a reflux inlet chamber (7), a reflux drainage chamber (8) and a steady flow water seal chamber (9) by means of the first partition plate (2), the reflux inlet chamber (7) being located above the raw liquid pool (25), the reflux drainage chamber (8) being located above the reflux pool (26), the steady flow water seal chamber (9) being located between the reflux inlet chamber (7) and the reflux drainage chamber (8), and an upper guide channel (10) being left between the upper end of the first partition plate (2) and the negative pressure water tank (1); a liquid inlet pipe (3), wherein the upper end of the liquid inlet pipe (3) is in communication with the reflux liquid inlet cavity (7), and the lower end of the liquid inlet pipe (3) is used to extend into the raw liquid pool (25) and is located below the liquid level in the raw liquid pool (25); a one-way check valve (4), the one-way check valve (4) being arranged on the liquid inlet pipe (3) to prevent the inlet liquid from flowing back; a reflux pipe (5), the upper end of the reflux pipe (5) being in communication with the reflux drainage chamber (8), and the lower end of the reflux pipe (5) being configured to extend into the reflux pool (26) and positioned above the liquid level in the reflux pool (26); A reflux regulating valve (6), wherein the reflux regulating valve (6) is arranged on the reflux pipe (5).

2. The unpowered constant water level perpetual motion sewage reflux device according to claim 1, characterized in that: It also includes a second partition plate (11), which is arranged in the negative pressure water tank (1) and located in the steady flow water seal cavity (9), and a lower guide channel (12) is left between the lower end of the second partition plate (11) and the negative pressure water tank (1).

3. The unpowered constant water level perpetual motion sewage reflux device according to claim 1, characterized in that: The volume of the reflux drainage chamber (8) is V1, the volumes of the reflux inlet chamber (7) and the steady flow water seal chamber (9) are both V2, and V1>(3-5)V2.

4. The unpowered constant water level perpetual motion sewage reflux device according to claim 1, characterized in that: One end of the reflux pipe (5) connected to the reflux drainage chamber (8) is vertically and spirally designed.

5. The unpowered constant water level perpetual motion sewage reflux device according to claim 1, characterized in that: It also includes a water replenishing valve (13), which is arranged on the negative pressure water tank (1) and is in communication with the steady flow water sealing chamber (9).

6. The unpowered constant water level perpetual motion sewage reflux device according to claim 1, characterized in that: It also includes a siphon breaking valve (14), which is arranged on the negative pressure water tank (1) and is in communication with the steady flow water seal chamber (9).

7. The unpowered constant water level perpetual motion sewage reflux device according to claim 1, characterized in that: It also includes a reflux flow meter (15), which is arranged on the reflux pipe (5).

8. The unpowered constant water level perpetual motion sewage reflux device according to claim 1, characterized in that: Also includes, A manhole (16), the manhole (16) being provided on the negative pressure water tank (1) and located at the top of the negative pressure water tank (1); A sealing cover plate (17) is provided in a sealing manner at the manhole (16), and the sealing cover plate (17) and the manhole (16) are detachably connected.

9. The unpowered constant water level perpetual motion sewage reflux device according to claim 8, characterized in that: One side of the sealing cover plate (17) is hinged to the manhole (16), and further includes: A positioning frame (18), the positioning frame (18) is arranged on the manhole (16), the number of the positioning frames (18) is multiple, and all the positioning frames (18) are arranged along the circumferential direction on the periphery of the manhole (16); a positioning rod (19), the positioning rod (19) being arranged on the positioning frame (18) and being hinged to the positioning frame (18); a screw rod (20), wherein the lower end of the screw rod (20) is rotatably connected to the positioning rod (19), and after the positioning rod (19) rotates, the upper end of the screw rod (20) reaches above the sealing cover plate (17); A nut (21) is threadedly connected to the screw (20), and a notch (22) is provided on the lower end surface of the nut (21) facing the sealing cover plate (17). After the positioning rod (19) rotates, the side wall of the notch (22) contacts the outer side wall of the sealing cover plate (17). After the screw (20) rotates, the nut (21) descends, and the upper end surface of the notch (22) contacts the upper end surface of the sealing cover plate (17).

10. The unpowered constant water level perpetual motion sewage reflux device according to claim 1, characterized in that: Also includes, a first positioning sleeve (23), the first positioning sleeve (23) being arranged in the raw liquid pool (25) and sleeved on the periphery of the liquid inlet pipe (3); A second positioning sleeve (24), the second positioning sleeve (24) is arranged in the reflux pool (26) and is sleeved on the periphery of the reflux pipe (5).

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