Submerged tight filtering device

Abstract

The utility model discloses a submerged tight filtering device which comprises a clean water tank, a filtering unit, a backwashing unit and a water distribution unit, the filter unit is arranged in the clean water tank and used for filtering sewage, the backwashing unit is arranged in the clean water tank and used for backwashing the filter unit, and the water distribution unit is arranged above the filter unit and used for supplying sewage to be treated. According to the submerged compact filtering device disclosed by the utility model, the filtering tank and the backwashing tank are arranged into a whole, so that integral hoisting can be realized, and the filtering tank and the backwashing tank are put in from the top end of the clean water tank during use and can be rapidly hoisted out from the clean water tank during maintenance; the backwashing pump is adopted in the backwashing process, so that the situation that a plurality of electric valves can be used for switching backwashing flows is avoided, and the overall cost is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the field of sewage treatment, in particular to a submerged compact filtering device. Background Art

[0002] The filter device used in the back end of sewage treatment usually consists of a device box and internal filter material, backwashing device, etc. It is usually installed on the ground. The device box is generally a rectangular box or a vertical round tank. The filter material is sand or other granular or fibrous fillers. After a long period of filtration, the filter material in the filter device will absorb a large amount of pollutants and hinder the filtration effect. The filter material needs to be cleaned regularly.

[0003] In the prior art, a backwash device is usually used and equipped with multiple electric valves and other piping devices for cleaning. Since the filter device requires 4 to 5 sets of electric valves to complete the switching between normal filtering and backwashing operations, and the electric valves are relatively expensive, its cost is relatively high. On the other hand, the filter device must be installed on the ground to ensure the normal use of the electric valve, which limits its use scenarios.

[0004] The equipment for village and town sewage treatment projects needs to be installed underground, and existing filtration devices are not applicable. In addition, the equipment must be simple to operate and able to adapt to the usage and operation characteristics of rural areas.

[0005] Therefore, in view of the needs of village and town sewage treatment, it is urgently necessary to provide a submersible compact filtering device suitable for village and town sewage treatment. Utility Model Content

[0006] The utility model is a submersible compact filtering device, which is suitable for the use requirements of the rural sewage treatment filtering process section, is simple to operate, and the equipment can be buried for operation. The filter pool is nested in the clean water pool and is placed in a submerged manner. Normal operation and backwashing do not require electric valve switching, saving investment.

[0007] The utility model solves the technical problem by adopting the following technical solutions:

[0008] A submersible compact filtering device, comprising a clean water tank, a filtering unit, a backwashing unit and a water distribution unit; the filtering unit is arranged inside the clean water tank for filtering sewage, the backwashing unit is arranged inside the clean water tank for backwashing the filtering unit, and the water distribution unit is arranged above the filtering unit for supplying sewage to be treated;

[0009] A clean water pump and a liquid level sensor are arranged inside the clean water tank, wherein the clean water pump is used to pump out the clean water inside the clean water tank, and the liquid level sensor is used to monitor the liquid level in the clean water tank;

[0010] The filter unit comprises a filter pool with openings at both ends, the filter pool is arranged in the clean water pool, and its bottom is spaced apart from the bottom of the clean water pool, a first interception plate, a filter material layer and a pebble cushion layer are arranged in sequence from top to bottom inside the filter pool, and a filter head is arranged at the bottom of the pebble cushion layer;

[0011] The backwash unit comprises a backwash tank, a backwash water pump and a backwash air pump; one end of the backwash tank is open and connected to the filter tank by a shared middle partition, and the bottom of the backwash tank is spaced apart from the bottom of the clean water tank; a second interception plate is arranged on the middle partition, and the structure of the second interception plate is the same as that of the first interception plate, and the backwash tank and the filter tank are connected to each other through the circular through hole on the second interception plate; the backwash water pump is arranged at the bottom of the backwash tank; the backwash air pump is arranged outside the clean water tank, and an air pipe is connected to the air outlet of the backwash air pump, and the air pipe passes through the side wall of the clean water tank and extends to the inside of the clean water tank, and its air outlet is arranged at the bottom of the filter tank;

[0012] The water distribution unit comprises a water inlet pipe and a water distributor. One end of the water inlet pipe is connected to the sewage pipe, and the other end is connected to the water distributor. The water distributor is arranged above the filter tank body.

[0013] Furthermore, a clear water tank low liquid level scale line, a clear water tank high liquid level scale line and a clear water tank backwash level scale line are arranged on the wall of the clear water tank, and the clear water tank backwash level scale line is higher than the clear water tank high liquid level scale line.

[0014] Furthermore, the first intercepting plate is a PVC plate with a thickness of 10 mm, and a plurality of circular through holes with a diameter of 3 mm are opened on its surface; the filter material layer is filled with fiber knot filter material, and the fiber knot filter material is composed of bundled fiber filaments knotted in the middle, and the length of the bundled fiber filaments is 50 to 80 mm, and it is made of chemical fiber material with a specific gravity greater than 1.2; the pebble cushion layer is filled with pebbles.

[0015] Furthermore, the clean water pump and the backwash water pump are both submersible water pumps.

[0016] Furthermore, valves are provided on the air pipe of the backwash air pump and the water inlet pipe of the water distribution unit.

[0017] The utility model has the following beneficial effects: the submerged compact filtering device of the utility model can realize overall hoisting by setting the filtering tank and the backwashing tank as a whole. It can be put in from the top of the clean water tank when in use, and can be quickly hoisted out from the clean water tank during maintenance; the backwashing process adopts a backwashing pump to avoid the need to use multiple electric valves to switch the backwashing process, thereby effectively reducing the overall cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1This is the normal water production flow chart of the utility model;

[0019] Figure 2 This is the backwash flow chart of the utility model;

[0020] Figure 3 It is a schematic diagram of the fiber-knotted filter material in the utility model.

[0021] The markings in the figure are as follows: 1-clean water tank; 2-filter tank; 3-backwash tank; 4-backwash water pump; 5-water distributor; 11-clean water pump; 12-liquid level sensor; 21-first interception plate; 22-filter material layer; 23-pebble cushion layer; 24-filter head; 31-middle partition; 32-second interception plate. DETAILED DESCRIPTION

[0022] The technical solution of the utility model is further described below in conjunction with the embodiments and drawings.

[0023] Example 1

[0024] like Figure 1 As shown, a submersible compact filtering device includes a clean water tank 1, a filtering unit, a backwashing unit and a water distribution unit; the filtering unit is arranged inside the clean water tank 1 for filtering sewage, the backwashing unit is arranged inside the clean water tank 1 for backwashing the filtering unit, and the water distribution unit is arranged above the filtering unit for supplying sewage to be treated.

[0025] Specifically, a clean water pump 11 and a liquid level sensor 12 are provided inside the clean water tank 1 . The clean water pump is used to pump out the clean water inside the clean water tank, and the liquid level sensor is used to monitor the liquid level in the clean water tank.

[0026] In this embodiment, the clear water tank wall is provided with a clear water tank low liquid level scale line, a clear water tank high liquid level scale line and a clear water tank backwash level scale line, and the clear water tank backwash level scale line is higher than the clear water tank high liquid level scale line; the clear water pump 11 is a submersible water pump.

[0027] The filter unit includes a filter pool 2 with openings at both ends. The filter pool 2 is arranged in the clean water pool 1, and its bottom is spaced apart from the bottom of the clean water pool 1. A first interception plate 21, a filter material layer 22 and a pebble cushion layer 23 are arranged in sequence from top to bottom inside the filter pool 2, and a filter head 24 is arranged at the bottom of the pebble cushion layer.

[0028] In this embodiment, the first intercepting plate 21 is a PVC plate with a thickness of 10 mm, and a plurality of circular through holes with a diameter of 3 mm are opened on its surface. The circular through holes can serve as water passages and can also intercept filter materials. The filter material layer 22 is filled with fiber knot filter materials, and the fiber knot filter materials are composed of bundled fiber filaments knotted in the middle. By knotting the fiber filaments in the middle, the bundled fiber filaments can be effectively prevented from spreading. The length of the bundled fiber filaments is 50 to 80 mm, and they are made of chemical fiber materials with a specific gravity greater than 1.2, which is conducive to sinking and accumulating in water to play a filtering role. The pebble cushion layer 22 is filled with pebbles, and the particle size of the pebbles can be selected according to actual conditions.

[0029] The backwash unit includes a backwash tank 3, a backwash water pump 4 and a backwash air pump. One end of the backwash tank 3 is open and connected to the filter tank 2 through a shared middle partition 31, and the bottom of the backwash tank 3 is spaced from the bottom of the clean water tank 1; a second interception plate 32 is arranged on the middle partition 31, and the structure of the second interception plate 32 is the same as that of the first interception plate 21. The backwash tank 3 and the filter tank 2 are connected to each other through the circular through hole on the second interception plate 32; the backwash water pump 4 is arranged at the bottom of the backwash tank 3, and is used to pump out the water in the backwash tank 3; the backwash air pump is arranged outside the clean water tank, and an air pipe is connected to the air outlet of the backwash air pump, and the air pipe passes through the side wall of the clean water tank and extends to the inside of the clean water tank, and its air outlet is arranged at the bottom of the filter tank 2. Preferably, the backwash water pump is a submersible water pump; a valve is arranged on the air pipe of the backwash air pump to control the supply of backwash gas.

[0030] In this embodiment, when sewage is treated, the liquid level in the filter tank is higher than the bottom of the second interception plate. At this time, part of the sewage will enter the backwash tank, but the backwash tank is a closed space connected to the filter tank and will not leak sewage.

[0031] The water distribution unit includes a water inlet pipe and a water distributor 5, one end of the water inlet pipe is connected to the sewage pipe, and the other end is connected to the water distributor, and the water distributor is arranged above the filter tank body. Preferably, a valve is arranged on the water inlet pipe to control the supply of sewage.

[0032] The filter device of the utility model is in normal water production, such as Figure 1 As shown, sewage enters the water distributor through the pipe, and the water distributor sprays and diffuses the sewage evenly. After passing through the circular through hole on the first interception plate, it drips into the filter tank, passes through the filter material layer and the pebble cushion layer downward, and finally exits through the filter head to complete the filtration. After the filtered clean water enters the clean water tank, it is discharged outward through the clean water pump. The liquid sensor monitors the liquid level in the clean water tank in real time, and controls the start and stop of the clean water pump to keep the liquid level of the clean water tank between the low liquid level scale line and the high liquid level scale line of the clean water tank.

[0033] During backwashing, first turn off the clean water pump and continue to supply sewage until the liquid level in the clean water tank reaches the backwash liquid level scale line of the clean water tank, then stop supplying sewage; then turn on the backwash air pump to supply compressed air, and at the same time turn on the backwash pump to pump water, the compressed air enters the filter material layer upward, and the bubbles impact the water, causing the filter material layer to expand and churn, shaking off the adhered filter sludge; the backwash pump simultaneously pumps water outward, lowering the liquid level in the backwash tank body. Under the action of the liquid level difference, the clean water in the clean water tank enters the filter tank, and passes through the filter head, pebble cushion layer, bundled fiber knot filter material and the second interception plate in turn, and then enters the backwash tank, so that the pollutants on the bundled fiber knot filter material are brought into the backwash tank body and pumped out through the backwash pump, finally completing the backwash.

[0034] The submersible tight filtering device of the utility model can realize overall lifting by setting the filtering tank and the backwashing tank as a whole. When in use, it is put in from the top of the clean water tank and can be quickly lifted out of the clean water tank during maintenance. The backwashing process adopts a backwashing pump to avoid the need to use multiple electric valves to switch the backwashing process, thereby effectively reducing the overall cost.

[0035] The order of the above embodiments is only for the convenience of description and does not represent the advantages or disadvantages of the embodiments.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A submersible compact filtering device, characterized in that: It includes a clear water tank, a filter unit, a backwash unit and a water distribution unit; the filter unit is arranged inside the clear water tank for filtering sewage, the backwash unit is arranged inside the clear water tank for backwashing the filter unit, and the water distribution unit is arranged above the filter unit for supplying sewage to be treated; Wherein, a clean water pump and a liquid level sensor are arranged inside the clean water tank, the clean water pump is used to pump out the clean water inside the clean water tank, and the liquid level sensor is used to monitor the liquid level in the clean water tank; The filter unit comprises a filter pool with openings at both ends, the filter pool is arranged in the clean water pool, and its bottom is spaced apart from the bottom of the clean water pool, a first interception plate, a filter material layer and a pebble cushion layer are arranged in sequence from top to bottom inside the filter pool, and a filter head is arranged at the bottom of the pebble cushion layer; The backwash unit comprises a backwash tank, a backwash water pump and a backwash air pump; one end of the backwash tank is open and connected to the filter tank by a shared middle partition, and the bottom of the backwash tank is spaced apart from the bottom of the clean water tank; a second interception plate is arranged on the middle partition, and the structure of the second interception plate is the same as that of the first interception plate, and the backwash tank and the filter tank are connected to each other through the circular through hole on the second interception plate; the backwash water pump is arranged at the bottom of the backwash tank; the backwash air pump is arranged outside the clean water tank, and an air pipe is connected to the air outlet of the backwash air pump, and the air pipe passes through the side wall of the clean water tank and extends to the inside of the clean water tank, and its air outlet is arranged at the bottom of the filter tank; The water distribution unit comprises a water inlet pipe and a water distributor. One end of the water inlet pipe is connected to the sewage pipe, and the other end is connected to the water distributor. The water distributor is arranged above the filter tank body.

2. The submersible compact filtering device according to claim 1, characterized in that: The clear water tank wall is provided with a clear water tank low liquid level scale line, a clear water tank high liquid level scale line and a clear water tank backwashing liquid level scale line, and the clear water tank backwashing liquid level scale line is higher than the clear water tank high liquid level scale line.

3. The submersible compact filtering device according to claim 2, characterized in that: The first intercepting plate is a PVC plate with a thickness of 10 mm and a plurality of circular through holes with a diameter of 3 mm are opened on its surface; the filter material layer is filled with fiber knot filter material, and the fiber knot filter material is composed of bundled fiber filaments knotted in the middle, and the length of the bundled fiber filaments is 50 to 80 mm, and it is made of chemical fiber material with a specific gravity greater than 1.2; the pebble cushion layer is filled with pebbles.

4. The submersible compact filtering device according to claim 3, characterized in that: The clean water pump and the backwash water pump are both submersible water pumps.

5. The submersible compact filtering device according to claim 1, characterized in that: Valves are provided on the air pipe of the backwash air pump and the water inlet pipe of the water distribution unit.

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