An unpowered backflow device

Abstract

The application provides a kind of unpowered backflow device, including several water tanks arranged in first reaction pool and top opening, water tank is used to receive sewage in first reaction pool, the bottom of water tank is provided with bottom opening gas cover, water tank and gas cover are communicated by communicating pipe, valve is arranged in communicating pipe, valve is used to control the on-off of communicating pipe, the side of water tank away from communicating pipe is provided with backflow weir, the top of side plate of water tank is rotatably connected with backflow weir by rotating assembly, the elevation of liquid level of backflow weir is greater than the elevation of liquid level of first reaction pool, backflow weir is used to receive sewage in water tank and guide it to second reaction pool, the bottom of gas cover is provided with aeration device, gas cover collects gas generated in aeration process, water tank is lifted to make water tank rotate relative to backflow weir, so that sewage in water tank is backflowed to backflow weir, the unpowered backflow device provided by the application has obvious energy-saving effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of sewage treatment, in particular to a kind of unpowered backflow device. BACKGROUND

[0002] The sewage produced by people in daily production and life increases rapidly, new substances are mixed in water or because of the change of external conditions, which leads to water deterioration and cannot continue to maintain the original use function. With the improvement of people's living standards, the nitrogen and phosphorus content in sewage increases, making treatment difficult.

[0003] In the sewage treatment process, multiple reaction tanks are often needed. In order to achieve energy saving by gravity, the elevation of each tank is generally designed to gradually decrease from the inlet to the outlet. In many processes, the water in the oxygen tank near the outlet needs to be backflowed to the anoxic tank or anaerobic tank near the inlet to achieve denitrification and phosphorus removal. The backflow is usually achieved by backflow pump, and the backflow ratio is usually 200%~500%, the backflow flow is 2~5 times of the inlet flow. Therefore, the backflow pump is a high-energy consumption device in sewage treatment plant, which is not conducive to energy saving and consumption reduction of sewage treatment plant. SUMMARY

[0004] Therefore, the purpose of the present application is to provide an unpowered backflow device to solve the technical problems in the prior art.

[0005] The present application provides an unpowered backflow device for backflowing sewage from a first reaction tank with low elevation to a second reaction tank with high elevation. The unpowered backflow device comprises a plurality of water tanks arranged in the first reaction tank and having an open top. The water tank is used to receive sewage in the first reaction tank. A gas cover with an open bottom is arranged below the water tank. A communication pipe is arranged between the water tank and the gas cover. A valve is arranged in the communication pipe to control the opening and closing of the communication pipe. A backflow weir is arranged on the side of the water tank away from the communication pipe. The top of the side plate of the water tank is rotatably connected to the backflow weir by a rotating assembly. The liquid level elevation of the backflow weir is higher than that of the first reaction tank. The backflow weir is used to receive sewage in the water tank and guide it into the second reaction tank. An aeration device is arranged at the bottom of the gas cover. The gas cover collects the gas generated by the aeration device during the aeration process, and lifts the water tank to rotate the water tank relative to the backflow weir, so as to backflow the sewage in the water tank to the backflow weir.

[0006] The present application has the beneficial effects that: the present application provides a non-powered backflow device, comprising a water tank and a gas cover, the water tank and the gas cover are communicated through a communication pipe, a valve is arranged in the communication pipe to open and close, a backflow weir is arranged on the side of the water tank away from the communication pipe, and the top of the side plate of the water tank is rotationally connected with the backflow weir through a rotating assembly; the bubbles generated in the aeration process of the aeration device enter the gas cover, the buoyancy increases, the water tank connected with the gas cover is turned over, and then the water in the water tank with low elevation is backflowed to the backflow weir with high elevation; after the sewage in the water tank is backflowed, the valve is opened, the gas in the gas cover is released, the buoyancy decreases, the water tank is reversed and reset, and the next cycle is performed; the device uses the escaping air as power to push the device to turn over, and backflow the mixture of mud and water to the overflow weir, so that the power consumption is reduced or even no power is consumed, and the energy-saving effect is obvious.

[0007] Preferably, the angle between the side plate and the bottom plate of the gas cover is obtuse, and the length of the side plate of the gas cover close to the communication pipe is greater than the length of the side plate of the gas cover away from the communication pipe.

[0008] Preferably, a plurality of fixing rods are arranged between the gas cover and the water tank, and the gas cover and the water tank are fixedly connected through the fixing rods.

[0009] Preferably, the angle between the side plate of the water tank away from the communication pipe and the bottom plate thereof is obtuse.

[0010] Preferably, the angle between the side plate of the water tank away from the communication pipe and the bottom plate thereof is greater than 145°.

[0011] Preferably, a limiting rod is fixedly arranged on the side of the backflow weir close to the water tank, and an end of the limiting rod away from the backflow weir abuts against the gas cover to limit the rotation range of the gas cover.

[0012] Preferably, the valve is a floating ball valve, and the floating ball valve comprises a valve body and a first connecting rod connected with each other, and a valve ball is arranged at an end of the first connecting rod away from the valve body.

[0013] Preferably, the floating ball valve further comprises a second connecting rod connected with the valve body, an end of the second connecting rod away from the valve body penetrates through the limiting rod, a limiting protrusion is arranged at the end of the second connecting rod penetrating through the limiting rod and away from the valve body, the second connecting rod slides relative to the limiting rod, and the limiting protrusion is used for preventing the second connecting rod from falling off from the limiting rod.

[0014] Preferably, the valve is an electronic valve, and a level meter is arranged on the water tank, the level meter is used for monitoring the inclination angle of the water tank and controlling the opening and closing of the electronic valve according to the inclination angle.

[0015] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those having ordinary skill in the art upon examination of the following or can be learned from practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 Structure schematic diagram of the unpowered backflow device in stable state according to the present application;

[0017] Figure 2 Structure schematic diagram of the unpowered backflow device in sink backflow state according to the present application;

[0018] Figure 3 Structure schematic diagram of the unpowered backflow device in gas overflow process in gas cover according to the present application;

[0019] Figure 4 Structure schematic diagram of the unpowered backflow device in next cycle according to the present application;

[0020] Figure 5 Structure schematic diagram of the unpowered backflow device in which the valve is a floating ball valve according to the present application.

[0021] Main component symbol explanation:

[0022] 10, sink; 11, gas cover; 12, communication pipe; 13, valve; 131, valve body; 132, first connecting rod; 133, valve ball; 134, second connecting rod; 135, limiting protrusion; 14, backflow weir; 15, rotating assembly; 16, aeration device; 17, fixed rod; 18, limiting rod.

[0023] The following detailed description will further describe the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0024] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The drawings show several embodiments of the present application. However, the present application can be realized in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided so that the disclosure of the present application is more thorough and comprehensive.

[0025] It should be noted that when an element is referred to as being "fixedly attached" to another element, it can be directly on the other element or there can be intervening elements. When an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements can be present. As used herein the terms "vertical", "horizontal", "left", "right" and the like are merely used for the purpose of illustration.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application. The use herein of the terms "including", "comprising", "having" and the like are meant to encompass the items listed thereafter as well as other items.

[0027] Specifically, as shown in Figures 1 to 5 The present application provides a non-powered backflow device for backflowing sewage from a first reaction tank with a low elevation to a second reaction tank with a high elevation. The non-powered backflow device comprises a plurality of water tanks 10 arranged in the first reaction tank and open at the top, for receiving sewage in the first reaction tank. A gas cover 11 is arranged below the water tanks 10 and open at the bottom. A communication pipe 12 is arranged between the water tanks 10 and the gas cover 11. A valve 13 is arranged in the communication pipe 12 to control the opening and closing of the communication pipe. A backflow weir 14 is arranged on the side of the water tanks 10 away from the communication pipe 12. The top of the side plate of the water tanks 10 is rotatably connected to the backflow weir 14 by a rotating assembly 15. The liquid level of the backflow weir 14 is higher than that of the first reaction tank, for receiving sewage in the water tanks 10 and guiding the sewage into the second reaction tank. An aeration device 16 is arranged at the bottom of the gas cover 11. The gas cover 11 collects the gas generated by the aeration device 16 during the aeration process, to lift the water tanks 10 and rotate the water tanks 10 relative to the backflow weir 14, so as to backflow the sewage in the water tanks 10 into the backflow weir 14.

[0028] Optionally, in the present embodiment, the non-powered backflow device is arranged in the first reaction tank with a low elevation. The number of the non-powered backflow devices can be determined according to the size of the first reaction tank and the amount of backflowing water. The non-powered backflow device comprises the water tanks 10 and the gas cover 11. Both the water tanks 10 and the gas cover 11 are containers open at one side and have a wedge-shaped cross section. The water tanks 10 are open upward, and the gas cover 11 is open downward. The gas cover is arranged below the first reaction tank. The mixture of sludge and water in the first reaction tank flows into the water tanks 10, as shown in Figure 1 The aeration device 16 is arranged at the bottom of the first reaction tank. The bubbles generated by the aeration device 16 float upward from the bottom of the tank and are collected by the gas cover 11. The air in the gas cover 11 accumulates and the buoyancy increases. When the buoyancy exceeds the weight of the entire device plus the weight of the water in the water tanks, the entire device will overturn around the rotating assembly 15 of the water tanks 10 and the backflow weir 14, as shown in Figure 2 After the overturning to a certain angle, the mixture of sludge and water in the water tanks 10 flows into the backflow weir 14, and then is guided into the second reaction tank.

[0029] Optionally, in the embodiment, the angle between the side plate of the gas cover 11 and the bottom plate thereof is obtuse, the length of the side plate of the gas cover 11 close to the communicating pipe 12 is greater than the length of the side plate of the gas cover 11 away from the communicating pipe 12; during the turning of the device, the gas in the gas cover 11 can be prevented from overflowing from the edge, more gas can be collected, and the buoyancy can be continuously increased; as shown in Figure 3 , after the water in the water tank 10 flows back to the backflow weir 14, the valve 13 in the communicating pipe 12 is opened, the gas in the gas cover 11 overflows, the buoyancy decreases, and the device is turned back to the original position, as shown in Figure 4 , after the valve is closed, the gas cover 11 continues to collect gas, and enters the next cycle.

[0030] The unpowered backflow device provided in the embodiment uses the gas bubbles generated in the aeration process to increase the buoyancy after entering the gas cover 11, so that the water tank 10 connected with the gas cover 11 is turned and flipped, and then the water in the water tank 10 with a low liquid level is flowed back to the backflow weir 14 with a high liquid level. After the backflow, the valve 13 is opened to release the gas in the gas cover 11, the buoyancy decreases, the water tank 10 is turned back to the original position, and the next cycle is performed. The device uses the escaping air as power to turn the device and flow the sewage mixture back to the overflow weir, and consumes little or even no power. The energy-saving effect is obvious. The aeration device provides oxygen for the sewage treatment system in the reaction tank and has a stirring effect. When the gas bubbles are generated, they continuously rise to overflow the water body. The air overflowing the water body has no effect on the sewage treatment process. The device uses the aeration device that should be provided in the sewage plant as power to flow back the sewage. Optionally, the air-water ratio of the aeration tank can be 8-12, that is, the volume of air is 8-12 times the volume of water. After calculation, the power consumption per ton of water can be saved by 0.05-0.13 yuan. The operation and maintenance cost of the conventional sewage treatment process is 0.8-1.3 yuan per ton of water. The operation cost can be saved by about 6%-10%. The energy-saving and emission-reducing effect is remarkable, which meets the green and low-carbon concept advocated by the country and is suitable for wide promotion.

[0031] Optionally, in the embodiment, a plurality of fixed rods 17 are arranged between the gas cover 11 and the water tank 10, and the gas cover 11 and the water tank 10 are fixedly connected through the fixed rods 17; as shown in Figure 1 , the angle between the side plate of the water tank 10 away from the communicating pipe and the bottom plate thereof is obtuse, that is, the opening of the water tank is upward, the communicating pipe 12 is arranged on the right side of the water tank 10, and the angle between the side plate of the water tank 10 close to the communicating pipe 12 and the bottom plate thereof can be 90°, or can be outwardly inclined and be greater than 90°, as shown in Figure 3 , the angle between the side plate of the water tank 10 away from the communicating pipe 12 and the bottom plate thereof is obtuse, that is, the opening of the water tank is upward, the communicating pipe 12 is arranged on the right side of the water tank 10, and the angle between the side plate of the water tank 10 close to the communicating pipe 12 and the bottom plate thereof can be 90°, or can be outwardly inclined and be greater than 90°, as shown in

[0032] Optionally, in this embodiment, a limiting rod 18 is fixedly provided on the side of the reflux weir 14 near the water tank 10. The end of the limiting rod 18 away from the reflux weir 14 abuts against the air hood 11 to limit the rotation range of the air hood 11. During implementation, one end of the limiting rod 18 is fixed to the side wall of the reflux weir 14 or the reaction tank, and the other end contacts the air hood 11. During the flipping and resetting process of the air hood 11, the rotation range of the device is limited by the contact between the air hood 11 and the limiting rod 18.

[0033] Optionally, in this embodiment, such as Figure 5 As shown, valve 13 is a float valve, which includes a valve body 131 and a first connecting rod 132 connected to each other. A valve ball 133 is provided at the end of the first connecting rod 132 away from the valve body 131. The float valve is closed by the valve ball 133 and the first connecting rod 132. Furthermore, the float valve also includes a second connecting rod 134 connected to the valve body 131. The end of the second connecting rod 134 away from the valve body 131 passes through the limiting rod 18. A limiting protrusion 135 is provided at the end of the second connecting rod 134 passing through the limiting rod 18. The second connecting rod 134 slides relative to the limiting rod 18. The limiting protrusion 135 prevents the second connecting rod 134 from falling out of the limiting rod 18. That is, during the rotation of the shaft, the second connecting rod 134 slides to the right relative to the limiting rod 18. When it slides to the far right, due to the action of the limiting protrusion 135, the second connecting rod 134 no longer slides, generating a certain pulling force on the valve body 131, pulling the valve open. When the device returns to its original position, the float of the float valve closes the valve under the action of buoyancy. The float valve does not require any electricity. In some alternative embodiments, the valve may also be an electronic valve, and a level is arranged on the water tank to monitor the tilt angle of the water tank and control the opening and closing of the electronic valve according to the tilt angle.

[0034] The non-powered reflux device provided in this embodiment, during use, assumes a water tank volume of V1, an air hood collecting air volume of V2, and a device weight of g, converted to a water volume of Vg. The design ensures V2 > V1 + Vg, thus the buoyancy generated by V2 is greater than the weight of the device and the water in the tank, causing the entire device to float. During the floating process, air continues to enter the air hood; the design ensures V3 > V2. Upon reaching the water tank, the water is poured into the reflux weir, and the design ensures V3 > V2 again, causing it to continue floating and triggering the limit rod. The second connecting rod connected to the valve body then touches the limit rod, opening the float valve. Air inside the air hood overflows through the connecting pipe, buoyancy disappears, and gravity causes the device to fall around its axis. Figure 1 Position, float valve closed, air begins to accumulate in the air hood again. Air accumulates in the air hood until it reaches volume V2, then begins to float upwards around the axis, starting the repeated water pouring process.

[0035] Specifically, in this embodiment, V2 / (V1+Vg) can be designed to be approximately 1.2. If the air-to-water ratio in the aerobic zone of the reactor is 1:8, then the aeration volume is 8 times the influent flow rate Q, which is 8Q. If this device is arranged according to 1 / 3 of the aeration tank surface area, the amount of air that can be collected is:

[0036] V=8Q (1 / 3) / ( V2 / (V1+ Vg))=2.22 Q,

[0037] As can be seen from the above calculations, energy consumption coverage of 200% return flow can be achieved. Furthermore, the efficiency of the device can be optimized by adjusting the coverage area and the ratio of V2 / (V1+Vg). For example, the weight of the device can be reduced by using lightweight and durable plastic materials for the air cover and water tank, making the device more efficient.

[0038] This invention provides a non-powered backflow device, comprising a water tank 10 and an air hood 11, which are connected by a connecting pipe 12. A valve is installed in the connecting pipe 12 for opening and closing. A backflow weir 14 is located on the side of the water tank 10 away from the connecting pipe 12. The top of the side plate of the water tank 10 is rotatably connected to the backflow weir 14 via a rotating assembly 15. Air bubbles generated during aeration by the aeration device enter the air hood 11, increasing buoyancy and causing the water tank 10 connected to the air hood 11 to rotate and flip, thus returning the water in the lower-level water tank 10 to the higher-level backflow weir 14. After the wastewater in the water tank 10 returns, the valve 13 is opened, releasing the gas in the air hood 11. The buoyancy decreases, and the water tank 10 reverses and resets, starting the next cycle. This device uses the released air as power to drive the device to flip, returning the mud-water mixture to the overflow weir. It consumes little or no power, resulting in significant energy savings.

[0039] It should be noted that the above implementation process is only to illustrate the feasibility of this application, but it does not mean that the non-powered reflux device of this application has only the above-mentioned implementation processes. On the contrary, as long as the non-powered reflux device of this application can be implemented, it can be included in the feasible implementation scheme of this application.

[0040] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0041] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A non-powered recirculation device for recirculating wastewater from a first reaction tank at a lower elevation to a second reaction tank at a higher elevation, characterized in that, The non-powered reflux device includes several water tanks arranged in the first reaction tank with open tops. The water tanks are used to collect sewage from the first reaction tank. A bottom-opening air hood is provided below the water tank. The water tanks and the air hood are connected by a connecting pipe. A valve is provided in the connecting pipe to control the opening and closing of the connecting pipe. A reflux weir is provided on the side of the water tank away from the connecting pipe. The top of the side plate of the water tank is rotatably connected to the reflux weir by a rotating assembly. The liquid level of the reflux weir is higher than the liquid level of the first reaction tank. The reflux weir is used to collect sewage from the water tank and guide it to the second reaction tank. An aeration device is provided at the bottom of the air hood. The air hood collects the gas generated by the aeration device during the aeration process and lifts the water tank so that the water tank rotates relative to the reflux weir to return the sewage in the water tank to the reflux weir.

2. The non-powered recirculation device according to claim 1, characterized in that, The angle between the side plate of the air hood and its bottom plate is an obtuse angle, and the length of the side plate of the air hood closer to the connecting pipe is greater than the length of the side plate farther away from the connecting pipe.

3. The non-powered recirculation device according to claim 1, characterized in that, Several fixing rods are provided between the air cover and the water tank, and the air cover and the water tank are fixedly connected by the fixing rods.

4. The non-powered recirculation device according to claim 1, characterized in that, The angle between the side plate of the water tank away from the connecting pipe and its bottom plate is an obtuse angle.

5. The non-powered recirculation device according to claim 4, characterized in that, The angle between the side plate of the water tank away from the connecting pipe and its bottom plate is greater than 145°.

6. The non-powered recirculation device according to claim 1, characterized in that, A limiting rod is fixedly provided on the side of the return weir near the water tank. The end of the limiting rod away from the return weir abuts against the air hood to limit the rotation range of the air hood.

7. The non-powered recirculation device according to claim 6, characterized in that, The valve is a float valve, which includes a valve body and a first connecting rod connected to each other, and a valve ball is provided at the end of the first connecting rod away from the valve body.

8. The non-powered recirculation device according to claim 7, characterized in that, The float valve also includes a second connecting rod connected to the valve body. The end of the second connecting rod away from the valve body passes through the limiting rod. The end of the second connecting rod that passes through the limiting rod and is away from the valve body is provided with a limiting protrusion. The second connecting rod slides relative to the limiting rod. The limiting protrusion is used to prevent the second connecting rod from falling out of the limiting rod.

9. The non-powered recirculation device according to claim 1, characterized in that, The valve is an electronic valve, and a level is installed on the water tank. The level is used to monitor the tilt angle of the water tank and control the opening and closing of the electronic valve according to the tilt angle.

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