Negative pressure desilting basin structure and use method

Abstract

The invention provides a negative pressure desilting basin structure and a use method, and belongs to the technical field of water treatment engineering, and the negative pressure desilting basin structure comprises a main body, a water inlet pipe, a water outlet pipe and an exhaust pipe; according to the scheme, the interior of the precipitation space is in a negative pressure state through the exhaust pipe, water enters the precipitation space through the water inlet pipe due to negative pressure, the water level in the precipitation space gradually rises under the action of the negative pressure, and when the water level reaches the height of the water outlet pipe, the water without impurities is discharged through the water outlet pipe. According to the device, water enters from the lower part and exits from the upper part, and the volume of the precipitation space is increased in the vertical direction, so that the advantage of reducing the occupied area is realized.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment engineering, and in particular to a negative pressure grit chamber structure and a use method thereof. Background Art

[0002] At present, the sedimentation tank of the sewage treatment plant plays a vital role in the sewage treatment process. It is mainly used to remove inorganic particles with a large specific gravity in the sewage, such as silt, coal slag, etc. The working principle of the sedimentation tank (sedimentation tank) of the sewage treatment plant and the sedimentation tank in the water conservancy and hydropower project is mainly to increase the volume of the sedimentation tank and reduce the flow rate to complete the sedimentation of silt and dirt. The sedimentation tank removes sand particles with a particle size greater than 0.2mm and a density greater than 2.65t / cubic meter in the sewage through gravity sedimentation, protecting the subsequent treatment equipment from wear and blockage.

[0003] However, using this method for sedimentation treatment usually requires the construction of a larger sedimentation tank, and because the treatment effect of a single tank cannot meet the requirements, it is often necessary to build multiple tanks for joint treatment.

[0004] The existing solutions adopt an open pressureless flow method, such as a horizontal flow sedimentation tank. The principle is to use the principle of steady flow of water and free sedimentation of particles, set a longer tank body and maintain a lower flow rate, so that inorganic particles are precipitated to the bottom of the tank while flowing with water. The horizontal flow sedimentation tank has the advantages of simple structure and stable operation.

[0005] However, the advection sedimentation tank is mainly an open type without pressure flow, and the water flow condition is also a "flat in and flat out" method, and the space condition is effectively utilized. When the sedimentation rate needs to be increased, the only way is to increase the floor area of ​​the sedimentation tank, resulting in a very large volume of the sedimentation tank in the prior art. Summary of the invention

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the defect of large floor space in the prior art, thereby providing a negative pressure sedimentation tank structure and a use method.

[0007] In order to solve the above problems, the present invention provides a negative pressure sedimentation tank structure, comprising:

[0008] The main body has a closed sedimentation space arranged inside;

[0009] A water inlet pipe connected to the main body; the water inlet pipe is in communication with the sedimentation space; the water inlet pipe is suitable for inputting water flow toward the sedimentation space; the main body is provided with a water inlet corresponding to the water inlet pipe;

[0010] A water outlet pipe is connected to the main body; the water outlet pipe is in communication with the sedimentation space; the water outlet pipe is suitable for discharging water in the sedimentation space; the main body is provided with a water outlet corresponding to the water outlet pipe; the level of the water outlet is higher than the level of the water inlet;

[0011] An exhaust pipe is connected to the main body; the exhaust pipe is communicated with the sedimentation space, and the exhaust pipe is communicated with the top of the sedimentation space; the exhaust pipe is suitable for reducing the air pressure in the sedimentation space.

[0012] As a preferred solution, the subject comprises:

[0013] The first shell is a cylindrical structure; a first opening is provided at one end of the first shell; and a first space is formed inside the first shell;

[0014] The second shell is a conical structure, and a second opening is arranged at one end of the second shell; the second opening is arranged opposite to the first opening; a second space is formed inside the second shell; the first space and the second space constitute the sedimentation space.

[0015] As a preferred solution, it also includes:

[0016] A sand discharge pipe is connected to the main body; the sand discharge pipe is communicated with the bottom of the sedimentation space.

[0017] As a preferred solution, the semi-cone angle of the second shell is greater than the static friction angle of gravel underwater.

[0018] As a preferred solution, it also includes:

[0019] The first valve is arranged on the water inlet pipe; the first valve is suitable for controlling the on-off of the water inlet pipe or controlling the water inlet flow rate.

[0020] As a preferred solution, it also includes:

[0021] The second valve is arranged on the water outlet pipe; the second valve is suitable for controlling the on-off of the water outlet pipe or controlling the water outlet flow rate.

[0022] As a preferred solution, it also includes:

[0023] The third valve is arranged on the exhaust pipe; the third valve is suitable for controlling the on-off of the exhaust pipe or controlling the size of the exhaust volume.

[0024] As a preferred solution, it also includes:

[0025] The fourth valve is arranged on the sand discharge pipe, and the fourth valve is suitable for controlling the on-off of the sand discharge pipe or the size of the sand flushing flow.

[0026] In order to solve the above problems, the present invention provides a method for using a negative pressure settling tank, including the negative pressure settling tank structure described above, and also including the following steps: first, the sedimentation space is in a sealed state, and the air pressure in the sedimentation space is reduced through an exhaust pipe, and then water continues to enter the sedimentation space through an inlet pipe under the action of air pressure, and impurities in the water body are precipitated at the bottom of the sedimentation space under the action of gravity, and the water level in the sedimentation space increases with time. When the water level in the sedimentation space reaches the position of the outlet pipe, the water without impurities is discharged through the outlet pipe.

[0027] As a preferred solution, first open the third valve to allow the exhaust pipe to reduce the pressure of the sedimentation space, and then open the first valve to allow water to enter the sedimentation space through the water inlet pipe; after the water level reaches the height of the exhaust pipe, open the second valve to discharge the impurity-free water through the outlet pipe; after a period of time, open the fourth valve to discharge the silt settled at the bottom of the sedimentation space.

[0028] The technical solution of the present invention has the following advantages:

[0029] 1. The negative pressure sedimentation tank structure provided by the present invention comprises: a main body, an inlet pipe, an outlet pipe and an exhaust pipe; a closed sedimentation space is arranged inside the main body; the inlet pipe is connected to the main body; the inlet pipe is communicated with the sedimentation space; the inlet pipe is suitable for inputting water flow toward the sedimentation space; the main body is provided with a water inlet corresponding to the inlet pipe; the outlet pipe is connected to the main body; the outlet pipe is communicated with the sedimentation space; the outlet pipe is suitable for discharging water in the sedimentation space; the main body is provided with a water outlet corresponding to the outlet pipe; the horizontal height of the water outlet buckle is higher than the horizontal height of the water inlet; the exhaust pipe is connected to the main body; the exhaust pipe is communicated with the sedimentation space, and the exhaust pipe is communicated with the top of the sedimentation space; the exhaust pipe is suitable for reducing the air pressure in the sedimentation space. In this solution, the sedimentation space is placed in a negative pressure state through the exhaust pipe. Due to the negative pressure, water enters the sedimentation space through the water inlet pipe. The water level in the sedimentation space gradually rises under the action of the negative pressure. When the water level reaches the height of the outlet pipe, the water without impurities is discharged through the outlet pipe. Through this device, the water enters from the bottom and exits from the top, and the volume of the sedimentation space is increased in the vertical direction, thereby achieving the advantage of reducing the floor space.

[0030] 2. The present invention provides a negative pressure sedimentation tank structure, wherein the main body includes a first shell and a second shell. The shape of the second shell is designed to be a conical structure. Impurities in the water body are settled on the inner wall of the second shell due to the action of gravity. Since the inner wall of the second shell is inclined, the silt will gather at the bottom of the second shell under the action of gravity. Gathering the silt at the bottom facilitates centralized treatment of the silt and increases cleaning efficiency.

[0031] 3. The negative pressure sedimentation tank structure provided by the present invention is also provided with a sand discharge pipe, by which the silt in the sedimentation space can be cleaned or collected.

[0032] 4. The present invention provides a negative pressure sedimentation tank structure, in which the semi-cone angle of the second shell is greater than the underwater static friction angle of gravel. By increasing the semi-cone angle of the second shell, gravel can also gather toward the bottom of the second shell in a static state, further ensuring the collection efficiency of sediment.

[0033] 5. The negative pressure sedimentation tank structure provided by the present invention also includes a first valve, which is arranged on the water inlet pipe; the first valve is suitable for controlling the on-off of the water inlet pipe or controlling the water inlet flow rate.

[0034] 6. The negative pressure sedimentation tank structure provided by the present invention also includes a second valve, which is arranged on the outlet pipe; the second valve is suitable for controlling the on-off of the outlet pipe or controlling the outlet flow rate.

[0035] 7. A negative pressure sand settling tank structure provided by the present invention also includes a third valve, which is arranged on the exhaust pipe; the third valve is suitable for controlling the on-off of the exhaust pipe or controlling the exhaust volume.

[0036] 8. A negative pressure sand settling tank structure provided by the present invention further includes a fourth valve, which is arranged on the sand discharge pipe and is suitable for controlling the on-off of the sand discharge pipe or the size of the sand flushing flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 The present invention provides a schematic diagram of the overall structure of a negative pressure sedimentation tank structure.

[0039] Description of reference numerals:

[0040] 1. Main body; 11. First shell; 12. Second shell; 13. Sedimentation space; 2. Water inlet pipe; 3. Water outlet pipe; 4. Exhaust pipe; 5. Sand discharge pipe; 6. First valve; 7. Second valve; 8. Third valve; 9. Fourth valve. DETAILED DESCRIPTION

[0041] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0045] Example 1

[0046] like Figure 1 As shown, a negative pressure sedimentation tank structure provided by the present invention includes: a main body 1, an inlet pipe 2, an outlet pipe 3 and an exhaust pipe 4; a closed sedimentation space 13 is arranged inside the main body 1; the inlet pipe 2 is connected to the main body 1; the inlet pipe 2 is communicated with the sedimentation space 13; the inlet pipe 2 is suitable for inputting water flow toward the sedimentation space 13; the main body 1 is provided with a water inlet corresponding to the inlet pipe 2; the outlet pipe 3 is connected to the main body 1; the outlet pipe 3 is communicated with the sedimentation space 13; the outlet pipe 3 is suitable for discharging water in the sedimentation space 13; the main body 1 is provided with a water outlet corresponding to the outlet pipe 3; the horizontal height of the water outlet buckle is higher than the horizontal height of the water inlet; the exhaust pipe 4 is connected to the main body 1; the exhaust pipe 4 is communicated with the sedimentation space 13, and the exhaust pipe 4 is communicated with the top of the sedimentation space 13; the exhaust pipe 4 is suitable for reducing the air pressure in the sedimentation space 13.

[0047] In this solution, the settling space 13 is placed in a negative pressure state through the exhaust pipe 4, and the water enters the settling space 13 through the water inlet pipe 2 due to the negative pressure. The water level in the settling space 13 gradually rises under the action of the negative pressure, and when the water level reaches the height of the water outlet pipe 3, the water without impurities is discharged through the water outlet pipe 3. Through this device, the water enters from the bottom and exits from the top, and the volume of the settling space 13 is increased in the vertical direction, thereby achieving the advantage of reducing the occupied area.

[0048] It should be noted that setting the height of the water outlet higher than that of the water inlet can further ensure the sedimentation effect. The size of the sedimentation space 13 can be extended in the vertical direction as required, thereby increasing the accommodation volume without affecting the floor area.

[0049] It should be noted that one end of the exhaust pipe 4 is connected to an exhaust device, and the settling space 13 is exhausted by the exhaust device, so that the air pressure in the settling space 13 is lower than the atmospheric pressure.

[0050] It should be noted that, in the present solution, the shape of the water inlet pipe 2 can be a circular pipe, wherein the diameter of the water inlet pipe 2 is determined according to the flow rate of the sedimentation.

[0051] Furthermore, the main body 1 includes a first shell 11 and a second shell 12 .

[0052] The first shell 11 is cylindrical, and a first opening is provided at one end of the first shell 11 ; a first space is formed inside the first shell 11 .

[0053] The second shell 12 is a conical structure. A second opening is provided at one end of the second shell 12 . The second opening is arranged opposite to the first opening. A second space is formed inside the second shell 12 . The first space and the second space constitute a sedimentation space 13 .

[0054] It should be noted that the shape of the second shell is designed to be a conical structure. Impurities in the water body are settled on the inner wall of the second shell 12 due to the action of gravity. Since the inner wall of the second shell 12 is inclined, the silt will gather at the bottom of the second shell 12 under the action of gravity. Gathering the silt at the bottom facilitates centralized treatment of the silt and increases cleaning efficiency.

[0055] It should be noted that the first opening and the second opening have the same shape, both of which are circular. In this solution, the first shell 11 and the second shell 12 are buckled with each other through the first opening and the second opening, and are fixed together by welding.

[0056] Furthermore, a sand discharge pipe 5 is provided, which is connected to the main body 1 and communicated with the bottom of the sedimentation space 13. The silt will gather at the bottom of the sedimentation space 13 under the action of gravity. The silt gathered at the bottom of the sedimentation space 13 can be cleaned up through the sand discharge pipe 5, thereby ensuring the sedimentation effect of the sedimentation space 13. Generally, during use, it is determined how often the sand is discharged based on the silt content in the water body. It should be noted that in order to ensure the sedimentation effect, the silt should be cleaned up when it does not exceed the height of the water inlet pipe 2.

[0057] It should be noted that in the present embodiment, the water inlet pipe 2, the water outlet pipe 3, the exhaust pipe 4 and the sand discharge pipe 5 are all made of steel pipes. As an alternative implementation, they may also be made of other materials with a long service life.

[0058] It should be noted that the second shell 12 is a partial cone. Figure 1 As shown, the cross-sectional area of ​​the second shell 12 gradually increases as the water level rises, and the second shell 12 is similar to an inverted cone, forming a shape that is larger at the top and smaller at the bottom.

[0059] Furthermore, the semi-cone angle of the second shell 12 is greater than the underwater static friction angle of gravel. In this solution, the semi-cone angle of the second shell 12 is designed to be 45 degrees, or the size of the semi-cone angle can be further increased.

[0060] Furthermore, a first valve 6 is provided, and the first valve 6 is provided on the water inlet pipe 2; the first valve 6 is suitable for controlling the on-off of the water inlet pipe 2 or controlling the water inlet flow rate.

[0061] Furthermore, a second valve 7 is provided, and the second valve 7 is provided on the water outlet pipe 3; the second valve 7 is suitable for controlling the on-off of the water outlet pipe 3 or controlling the water outlet flow rate.

[0062] Furthermore, a third valve 8 is provided, and the third valve 8 is provided on the exhaust pipe 4; the third valve 8 is suitable for controlling the on-off of the exhaust pipe 4 or controlling the size of the exhaust volume.

[0063] Furthermore, a fourth valve 9 is provided. The fourth valve 9 is provided on the sand discharge pipe 5 . The fourth valve 9 is suitable for controlling the on-off of the sand discharge pipe 5 or the size of the sand flushing flow rate.

[0064] It should be noted that the sand discharge method is: ① by adjusting the water inlet flow and the drainage flow, and opening the fourth valve 9 to simultaneously achieve drainage and sand flushing; ② when the sedimentation space 13 is full of water, the first valve 6, the fourth valve 9 and the second valve 7 can be closed, and then the sedimentation space 13 is pressurized (higher than atmospheric pressure) through the third valve 8 and then the fourth valve 9 is opened to flush the sand, which has a better effect and consumes less water.

[0065] It should be noted that the first valve 6, the second valve 7, the third valve 8 and the fourth valve 9 are all gate valves in this embodiment, which control the flow of the fluid by raising and lowering the gate plate, and can also control the flow rate by raising and lowering the gate plate, and have the advantages of small fluid resistance and good sealing performance.

[0066] It should be noted that the first valve 6, the second valve 7, the third valve 8 and the fourth valve 9 and the exhaust equipment are all connected to computers and other terminals. Computers and other terminals monitor the water inlet, water outlet, pressure in the sedimentation space 13 at any time. When any data has a problem, maintenance should be carried out immediately.

[0067] Example 2

[0068] This embodiment provides a method for using a negative pressure sedimentation tank, including the negative pressure sedimentation tank structure described in Embodiment 1, and further comprising the following steps: first, the sedimentation space 13 is in a sealed state, the air pressure in the sedimentation space 13 is reduced through the exhaust pipe 4, and then the water body continuously enters the sedimentation space 13 through the water inlet pipe 2 under the action of the air pressure, and the impurities in the water body are precipitated at the bottom of the sedimentation space 13 under the action of gravity, and the water level in the sedimentation space 13 increases over time, and when the water level in the sedimentation space 13 reaches the position of the outlet pipe 3, the water body without impurities is discharged through the outlet pipe 3. The advantage of reducing the occupied area is achieved by this method.

[0069] Specifically, first open the third valve 8 to allow the exhaust pipe 4 to reduce the pressure of the sedimentation space 13, and then open the first valve 6 to allow the water to enter the sedimentation space 13 through the water inlet pipe 2; after the water level reaches the height of the exhaust pipe, open the second valve 7 to discharge the impurity-free water through the water outlet pipe 3; after a period of time, open the fourth valve 9 to discharge the silt settled at the bottom of the sedimentation space 13.

[0070] It should be noted that, when the sedimentation space 13 needs to be drained, the exhaust volume of the exhaust pipe 4 should be reduced or the exhaust pipe 4 should be directly closed to ensure that the water outlet pipe 3 can discharge water normally.

[0071] It should be noted that, in order to ensure the drainage process, the first valve 6 is closed during the drainage process and the sedimentation space 13 is pressurized through the exhaust pipe 4 so that the drainage process proceeds normally.

[0072] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A negative pressure sedimentation tank structure, characterized in that: include: A main body (1) is provided with a sealed sedimentation space (13) inside; A water inlet pipe (2) is connected to the main body (1); the water inlet pipe (2) is in communication with the sedimentation space (13); the water inlet pipe (2) is suitable for inputting water flow toward the sedimentation space (13); and a water inlet corresponding to the water inlet pipe (2) is provided on the main body (1); A water outlet pipe (3) is connected to the main body (1); the water outlet pipe (3) is in communication with the sedimentation space (13); the water outlet pipe (3) is suitable for discharging water in the sedimentation space (13); the main body (1) is provided with a water outlet corresponding to the water outlet pipe (3); the water outlet has a higher level than the water inlet; An exhaust pipe (4) is connected to the main body (1); the exhaust pipe (4) is in communication with the sedimentation space (13), and the exhaust pipe (4) is in communication with the top of the sedimentation space (13); the exhaust pipe (4) is adapted to reduce the air pressure in the sedimentation space (13).

2. A negative pressure sedimentation tank structure according to claim 1, characterized in that: The main body (1) comprises: The first shell (11) is a cylindrical structure; a first opening is provided at one end of the first shell (11); a first space is formed inside the first shell (11); The second shell (12) is a conical structure. A second opening is provided at one end of the second shell (12). The second opening is arranged opposite to the first opening. A second space is formed inside the second shell (12). The first space and the second space constitute the sedimentation space (13).

3. A negative pressure sedimentation tank structure according to claim 1, characterized in that: Also includes: A sand discharge pipe (5) is connected to the main body (1); the sand discharge pipe (5) is in communication with the bottom of the sedimentation space (13).

4. A negative pressure sedimentation tank structure according to claim 2, characterized in that: The semi-cone angle of the second shell (12) is greater than the static friction angle of gravel underwater.

5. A negative pressure sedimentation tank structure according to claim 1, characterized in that: Also includes: The first valve (6) is arranged on the water inlet pipe (2); the first valve (6) is suitable for controlling the on-off of the water inlet pipe (2) or controlling the size of the water inlet flow.

6. A negative pressure sedimentation tank structure according to claim 1, characterized in that: Also includes: The second valve (7) is arranged on the water outlet pipe (3); the second valve (7) is suitable for controlling the on-off of the water outlet pipe (3) or controlling the size of the water outlet flow.

7. A negative pressure sedimentation tank structure according to claim 1, characterized in that: Also includes: The third valve (8) is arranged on the exhaust pipe (4); the third valve (8) is suitable for controlling the on-off of the exhaust pipe (4) or controlling the size of the exhaust volume.

8. A negative pressure sedimentation tank structure according to claim 3, characterized in that: Also includes: The fourth valve (9) is arranged on the sand discharge pipe (5), and the fourth valve (9) is suitable for controlling the on-off of the sand discharge pipe (5) or the size of the sand flushing flow.

9. A method for using a negative pressure sedimentation tank, characterized in that: The negative pressure sedimentation tank structure includes the following steps: first, the sedimentation space (13) is in a sealed state, and the air pressure in the sedimentation space (13) is reduced through the exhaust pipe (4); then, water continuously enters the sedimentation space (13) through the water inlet pipe (2) under the action of the air pressure; impurities in the water are precipitated at the bottom of the sedimentation space (13) under the action of gravity; the water level in the sedimentation space (13) increases over time; when the water level in the sedimentation space (13) reaches the position of the outlet pipe (3), the water without impurities is discharged through the outlet pipe (3).

10. The method for using a negative pressure grit chamber according to claim 9, characterized in that: First, the third valve (8) is opened to allow the exhaust pipe (4) to reduce the pressure of the sedimentation space (13), and then the first valve (6) is opened to allow water to enter the sedimentation space (13) through the water inlet pipe (2); after the water level reaches the height of the exhaust pipe, the second valve (7) is opened to discharge the impurity-free water through the water outlet pipe (3); after a period of time, the fourth valve (9) is opened to discharge the sediment deposited at the bottom of the sedimentation space (13).

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