Filter tank capable of controlling backwashing water level

Abstract

The utility model provides a filter tank capable of controlling backwashing water level, which relates to the technical field of sewage treatment, and comprises a tank body, a water inlet tank and a downcast pipe, a filter tank and a backwashing drainage tank which are arranged side by side along the horizontal direction are arranged in the tank body, the filter tank is filled with filter materials, and a clear water outlet is arranged at the bottom of the filter tank. A notch of the backwashing drainage tank is higher than the filter material, a backwashing water outlet is formed in the bottom of the backwashing water tank, a drainage valve is mounted at the backwashing water outlet, the water inlet tank is arranged above the filter tank, the water inlet tank is provided with at least one water outlet, the water outlet is higher than the notch of the backwashing drainage tank, and the top end of the downcast pipe is communicated with the water inlet tank. And the bottom end of the downcast pipe is communicated with the backwashing drainage tank. The filter tank capable of controlling the backwashing water level, provided by the utility model, can effectively reduce the influence of normal water inlet on the backwashing effect.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a filter tank capable of controlling a backwash water level. Background Art

[0002] In the sewage treatment system, the filtration process is an important process link. With the development of water supply and drainage technology, various filtration technologies emerge in an endless stream, but the V-type filter is widely used due to its own process technology and stable and reliable operation characteristics.

[0003] After the V-type filter has been working for a period of time, it is necessary to backwash the V-type filter to remove impurities and dirt on the filter media and restore the porosity of the filter media to extend the service life of the filter.

[0004] In the existing V-type filter tank, during normal filtration, the filter tank inlet water overflows from the upper part of the water distribution tank and flows into the filter tank through the sweeping water distribution holes as pre-filter water. During backwashing, part of the inlet water flows out from the downcomer, so that the filter tank inlet water flows out through the sweeping water distribution holes at the lower part of the water distribution tank during backwashing, thereby preventing the water outlet weir from overflowing and falling onto the water surface during backwashing, affecting the sweeping and washing effect of the water outlet from the sweeping water distribution holes during backwashing.

[0005] However, when the water volume of the sewage treatment system is small, the number of V-type filters in parallel will be limited. The total water volume of the sewage treatment system cannot be reduced synchronously with the backwashing of a single V-type filter. When backwashing a V-type filter, in order to avoid the impact of the backwashing of one V-type filter on the water volume of other V-type filters in parallel, the V-type filter also needs to maintain a normal water volume during backwashing, which will cause the water to overflow through the weir and fall to the water surface, affecting the sweeping effect of the water outlet of the water holes of the sweeping water cloth during backwashing.

[0006] In view of this, the inventor, based on many years of experience in production design in this field and related fields, has designed a filter tank capable of controlling the backwash water level after repeated experiments, in order to solve the problems existing in the prior art. Utility Model Content

[0007] The utility model aims to provide a filter tank capable of controlling the backwash water level, which can effectively reduce the influence of normal water inflow on the backwash effect.

[0008] To achieve the above-mentioned purpose, the utility model proposes a filter tank capable of controlling the backwash water level, wherein the filter tank comprises a tank body, an inlet trough and a downcomer, the tank body has a filter tank and a backwash drainage trough arranged side by side in a horizontal direction, the filter tank is filled with filter material, a clean water outlet is provided at the bottom of the filter tank, the notch of the backwash drainage trough is higher than the filter material, a backwash water outlet is provided at the bottom of the backwash water trough, a drain valve is installed at the backwash water outlet, the inlet trough is arranged above the filter tank, the inlet trough has at least one water outlet, the outlet is higher than the notch of the backwash drainage trough, the top end of the downcomer is connected to the inlet trough, and the bottom end of the downcomer is connected to the backwash drainage trough.

[0009] In the filter tank capable of controlling the backwash water level as described above, the water inlet groove is a V-shaped groove, a connecting port is provided on the side wall of the water inlet groove, and the top end of the downcomer is connected to the connecting port.

[0010] In the filter tank capable of controlling the backwash water level as described above, the top end of the downcomer is connected to the water inlet trough via an elbow.

[0011] The filter tank capable of controlling the backwash water level as described above, wherein the elbow is a siphon elbow.

[0012] The filter tank capable of controlling the backwash water level as described above, wherein the filter tank also includes a water distribution trough, the water distribution trough is arranged above the filter material and connected to the water outlet of the water inlet trough, and a water outlet weir is arranged on the top of the water distribution trough, and the water outlet weir is higher than the slot of the backwash drainage trough.

[0013] As described above, the filter tank capable of controlling the backwash water level, wherein a water distribution hole is further provided at the bottom of the water distribution tank, and the water distribution hole is lower than the notch of the backwash drainage tank and higher than the filter material.

[0014] The filter tank capable of controlling the backwash water level as described above, wherein a valve is installed on the downcomer.

[0015] The filter tank capable of controlling the backwash water level as described above, wherein the valve is a float valve.

[0016] The filter tank capable of controlling the backwash water level as described above, wherein an air flushing backwashing device is provided at the bottom of the filter tank.

[0017] The filter tank capable of controlling the backwash water level as described above, wherein a water flushing backwashing device is provided at the bottom of the filter tank.

[0018] Compared with the prior art, the utility model has the following characteristics and advantages:

[0019] The utility model proposes a filter tank capable of controlling the backwash water level, in which a downpipe is arranged between the water inlet trough and the backwash drainage trough. When the filter tank is backwashing, the pre-filter water in the water inlet trough directly enters the backwash drainage trough through the downpipe and is discharged, thereby preventing the pre-filter water in the water inlet trough from directly falling onto the water surface of the filter tank, thereby maintaining the effect of the water outlet of the water distribution holes of the sweeping water on the filter material during backwashing. When the filter tank is filtering normally, the drain valve on the backwash water outlet is closed, and the pre-filter water flowing out of the downpipe will cause the water level in the backwash drainage trough to continuously rise until it flows back to the filter tank through the notch of the backwash drainage trough. When the water levels in the backwash drainage trough and the filter tank are the same, the pre-filter water in the water inlet trough flows into the filter tank and is then filtered through the filter material, and the filtered clean water flows out from the clean water outlet at the bottom of the filter tank, thereby realizing the normal filtering function of the filter tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only for illustration purposes to help understand the present invention, and are not intended to specifically limit the shapes and proportional dimensions of the components of the present invention. Under the guidance of the present invention, those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to specific circumstances.

[0021] Figure 1 It is a structural schematic diagram of the filter tank proposed by the utility model;

[0022] Figure 2 It is a top view of the installation of the downcomer in the utility model;

[0023] Figure 3 for Figure 2 Cross-section view along the AA direction.

[0024] Description of Reference Numerals

[0025] 100. filter tank; 10. tank body;

[0026] 11. Filter tank; 12. Backwash drain tank;

[0027] 14. Clean water outlet; 15. Backwash water outlet;

[0028] 16. Drain valve; 17. Air flushing backwash device;

[0029] 18. Water flushing and backwashing device; 20. Water inlet tank;

[0030] 30. Downflow pipe; 40. Filter material;

[0031] 50. Elbow; 60. Water distribution trough;

[0032] 61. Water outlet weir; 62. Water distribution hole. DETAILED DESCRIPTION

[0033] The details of the present invention can be more clearly understood by combining the accompanying drawings with the description of the specific embodiments of the present invention. However, the specific embodiments of the present invention described herein are only used for the purpose of explaining the present invention and cannot be understood as limiting the present invention in any way. Under the guidance of the present invention, technicians can conceive of any possible variations based on the present invention, which should be considered to belong to the scope of the present invention.

[0034] Unless otherwise specified, the directions of up, down, left, and right mentioned in this document are all based on the directions shown in this utility model. Figure 1 The up, down, left and right directions in the figure shall prevail and are explained here.

[0035] like Figures 1 to 3 As shown, the utility model proposes a filter tank 100 capable of controlling the backwash water level. The filter tank 100 includes a tank body 10, an inlet trough 20 and a downcomer 30. The tank body 10 has a filter tank 11 and a backwash drainage trough 12 arranged side by side in a horizontal direction. The filter tank 11 is filled with filter material 40. A clean water outlet 14 is provided at the bottom of the filter tank 11. The notch of the backwash drainage trough 12 is higher than the filter material 40. A backwash water outlet 15 is provided at the bottom of the backwash drainage trough 12. A drain valve 16 is installed at the backwash water outlet 15. The inlet trough 20 is arranged above the filter tank 11. The inlet trough 20 has at least one water outlet, which is higher than the notch of the backwash drainage trough 12. The top end of the downcomer 30 is connected to the inlet trough 20, and the bottom end of the downcomer 30 is connected to the backwash drainage trough 12.

[0036] The filter tank 100 capable of controlling the backwash water level proposed in the utility model is provided with a downcomer 30 between the water inlet tank 20 and the backwash drainage tank 12. When the filter tank 100 is backwashed, the pre-filtered water in the water inlet tank 20 directly enters the backwash drainage tank 12 through the downcomer 30 and is discharged, thereby preventing the pre-filtered water in the water inlet tank 20 from directly falling to the water surface of the filter tank 11, thereby maintaining the sweeping effect of the water outlet of the sweeping water distribution holes on the filter material 40 during backwashing. When the filter tank 100 is performing normal filtration, the drain valve 16 on the backwash water outlet 15 is closed, and the pre-filter water flowing out of the downcomer 30 will cause the water level in the backwash drain trough 12 to continuously rise until it flows back to the filter tank 11 through the notch of the backwash drain trough 12. When the water levels in the backwash drain trough 12 and the filter tank 11 are the same, the pre-filter water in the water inlet trough 20 flows into the filter tank 11 and is then filtered through the filter material 40. The filtered clean water flows out from the clean water outlet 14 at the bottom of the filter tank 11, thereby realizing the normal filtration function of the filter tank 100.

[0037] In an optional embodiment of the present invention, the water inlet trough 20 is a V-shaped trough, and a connection port 21 is provided on the side wall of the water inlet trough 20, and the top end of the downcomer 30 is connected to the connection port 21. With the above structure, after the water level of the pre-filtered water in the water inlet trough 20 is raised, it can directly overflow from the weir of the V-shaped water inlet trough 20 into the filter tank 11, which not only ensures the normal filtration, but also enables the pre-filtered water to be more evenly distributed to various parts of the filter tank 11.

[0038] In an optional embodiment of the present invention, the top end of the downcomer 30 is connected to the water inlet trough 20 via an elbow 50, which effectively relieves pipeline pressure, reduces water resistance, and improves drainage efficiency.

[0039] In an optional example of this embodiment, the elbow 50 is a siphon elbow to further improve the drainage efficiency.

[0040] In an optional embodiment of the utility model, a water distribution trough 60 is further provided in the filter tank 100. The water distribution trough 60 is provided above the filter tank 11 and connected to the water outlet of the water inlet tank 20. A water outlet weir 61 is provided on the top of the water distribution trough 60. The water outlet weir 61 is higher than the notch of the backwash drainage tank 12. The water distribution trough 60 can evenly distribute the pre-filtration water to various parts of the filter tank 11, ensuring that the filter material 40 can be fully utilized, thereby improving the filtration efficiency, and also helping to avoid water short circuit or dead zone, ensuring the filtration effect.

[0041] In an optional example of this embodiment, a water distribution hole 62 is further provided at the bottom of the water distribution tank 60, and the water distribution hole 62 is lower than the notch of the backwash drainage tank 12 and higher than the filter material 40. During the backwash process, the pre-filter water flowing out of the water distribution hole 62 sweeps the surface of the filter material 40, helping to remove impurities and particulate matter attached to the surface of the filter material 40, restoring the filtering performance of the filter material 40, further improving the regeneration capacity of the filter tank 100, and extending the service life of the filter material 40.

[0042] In an optional embodiment of the present invention, a valve is installed on the downcomer 30 to control the flow of the downcomer 30. By adjusting the flow of the downcomer 30, the water level in the filter tank 11 (ie, the water distribution tank 60) during backwashing can be controlled to ensure the normal operation of backwashing.

[0043] In an optional example of this embodiment, the valve is a float valve to achieve automatic control of the water level to ensure the backwashing process.

[0044] In an optional embodiment of the present invention, a water backwashing device 18 is provided at the bottom of the filter tank 11 to clean the filter material 40 with filtered clean water, thereby increasing the service life of the filter material 40.

[0045] In an optional embodiment of the present invention, an air backwashing device 17 is provided at the bottom of the filter tank 11 to clean the filter material 40 through the injection and impact of air flow, thereby improving the cleaning efficiency of the filter material 40.

[0046] In the present utility model, the air flushing backwashing device 17 and the water flushing backwashing device 18 can adopt the existing technology familiar to those skilled in the art.

[0047] Please refer to Figures 1 to 3 Now, the specific implementation process of the filter tank 100 capable of controlling the backwash water level proposed by the present invention will be described in detail in conjunction with an embodiment.

[0048] In the utility model, a filter tank 100 is provided with a filter tank 11 and a backwash drainage tank 12, a water inlet tank 20 and a water distribution tank 60 are provided above the filter tank 11, a downpipe 30 is provided between the water inlet tank 20 and the backwash drainage tank 12, the top of the downpipe 30 passes through the wall and is connected to the side wall of the water inlet tank 20, and the lower part of the downpipe 30 directly extends into the backwash drainage tank 12.

[0049] When the filter tank 100 is filtering normally, water (pre-filtration water) enters the filter tank 100; the water overflows from the water outlet weir 61 at the upper part of the water distribution tank 60 and flows out from the water distribution hole 62 at the lower part of the water distribution tank 60 and enters the upper surface of the filter material 40 in the filter tank 11. At this time, the drain valve 16 at the bottom of the backwash drainage tank 12 is closed, and the pre-filtration water flowing out of the downcomer 30 will also cause the water level in the backwash drainage tank 12 to continue to rise until it flows back to the filter tank 11 through the pre-filtration water weir in the backwash drainage tank 12 and merges with the pre-filtration water flowing in from the water distribution tank 60, thereby achieving normal filtering operation.

[0050] When the filter tank 100 is backwashed, the drain valve 16 at the bottom of the backwash drainage trough 12 is opened, and the water level in the backwash drainage trough 12 drops rapidly. At this time, there is a significant water level difference between the water inlet trough 20 and the backwash drainage trough 12. Through the downcomer 30, the water in the water inlet trough 20 flows by gravity into the backwash drainage trough 12, thereby achieving the purpose of controlling the water level of the water inlet trough 20 during backwashing. Since the downcomer 30 is installed through the wall at the side wall of the water inlet trough 20, when part of the water in the water inlet trough 20 is diverted through the downcomer 30 and the water level is lowered, the water volume in the downcomer 30 will become smaller, thereby also achieving the purpose of controlling the water level of the water inlet trough 20. As the water level in the water inlet trough 20 decreases, the amount of pre-filter water flowing from the water inlet trough 20 into the water distribution trough 60 decreases, and the water level in the water distribution trough 60 also decreases accordingly. All the pre-filter water flows out through the water distribution holes 62 at the bottom of the water distribution trough 60, thereby preventing the pre-filter water from overflowing from the water outlet weirs of the water inlet trough 20 and the water distribution trough 60 during backwashing and falling to the water surface, thereby affecting the sweeping effect of the water outlet of the sweeping water distribution holes during backwashing.

[0051] The filter tank 100 proposed in the utility model can effectively control the water level in the water inlet tank 20 and the water distribution tank 60 during backwashing, thereby preventing the pre-filter water from overflowing from the top of the water inlet tank 20 or the water distribution tank 60, and ensuring the cleaning efficiency of the filter material during backwashing.

[0052] The detailed explanation of the above-mentioned embodiments is only intended to explain the present invention so as to facilitate a better understanding of the present invention. However, these descriptions cannot be interpreted as limitations on the present invention for any reason. In particular, the various features described in different embodiments may also be arbitrarily combined with each other to form other embodiments. Unless there is a clear description to the contrary, these features should be understood to be applicable to any embodiment and are not limited to the described embodiments.

Claims

1. A filter tank capable of controlling backwash water level, characterized in that: The filter tank includes a tank body, an inlet trough and a downcomer. The tank body has a filter tank and a backwash drainage trough arranged side by side in a horizontal direction. The filter tank is filled with filter material. A clean water outlet is provided at the bottom of the filter tank. The notch of the backwash drainage trough is higher than the filter material. A backwash water outlet is provided at the bottom of the backwash drainage trough. A drain valve is installed at the backwash water outlet. The inlet trough is arranged above the filter tank. The inlet trough has at least one water outlet, which is higher than the notch of the backwash drainage trough. The top end of the downcomer is connected to the inlet trough, and the bottom end of the downcomer is connected to the backwash drainage trough.

2. The filter tank capable of controlling the backwash water level according to claim 1, characterized in that: The water inlet groove is a V-shaped groove, a connecting port is opened on the side wall of the water inlet groove, and the top end of the downcomer is connected to the connecting port.

3. The filter tank capable of controlling the backwash water level according to claim 1, characterized in that: The top end of the downcomer is connected to the water inlet trough through an elbow.

4. The filter tank capable of controlling the backwash water level as claimed in claim 3, characterized in that: The elbow is a siphon elbow.

5. The filter tank capable of controlling backwash water level according to claim 1, characterized in that: The filter tank also includes a water distribution trough, which is arranged above the filter material and connected to the water outlet of the water inlet trough. The top of the water distribution trough is provided with a water outlet weir, and the water outlet weir is higher than the notch of the backwash drainage trough.

6. The filter tank capable of controlling the backwash water level as claimed in claim 5, characterized in that: A water distribution hole is also provided at the bottom of the water distribution tank, and the water distribution hole is lower than the notch of the backwash drainage tank and higher than the filter material.

7. The filter tank capable of controlling backwash water level according to claim 1, characterized in that: A valve is installed on the downcomer.

8. The filter tank capable of controlling the backwash water level according to claim 7, characterized in that: The valve is a float valve.

9. The filter tank capable of controlling backwash water level according to claim 1, characterized in that: An air flushing backwashing device is arranged at the bottom of the filter tank.

10. The filter tank capable of controlling backwash water level according to claim 1, characterized in that: A water flushing backwashing device is arranged at the bottom of the filter tank.

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