Sewage treatment device with self-cleaning function

Abstract

The utility model relates to the field of sewage treatment, and discloses a sewage treatment device with a self-cleaning function, which comprises a shell with a cavity structure inside; the shell is divided into an inner cavity and an outer cavity by the filter cartridge; the water inlet is selectively communicated with the inner cavity or the outer cavity; the water outlet is communicated with the outer cavity; the water outlet is communicated with the inner cavity; and the reversing mechanism is configured to receive a control signal and switch the water inlet to be selectively communicated with the inner cavity or the outer cavity, so that the water flow direction is switched between two flow directions of flowing from the inner cavity to the outer cavity and flowing from the outer cavity to the inner cavity, and the switching between filtering and back flushing is realized. According to the utility model, through the change of the structure, the water flow direction can be changed to wash filtered matters attached to the surface of the filter cartridge, and the filter cartridge does not need to be frequently disassembled for washing or replaced, so that the use cost and the time cost for maintaining the filter cartridge are reduced; and a back flushing pump does not need to be additionally arranged, so that the equipment cost is further reduced, and the structure is simplified.

Description

Technical Field

[0001] The utility model relates to the field of sewage treatment, in particular to a sewage treatment device with a self-cleaning function. Background Art

[0002] After the sewage treatment device is used for a long time, a large amount of filter residues will accumulate on the sewage side of the filter screen. The attachment of the filter residues to the filter screen will cause the blockage of the filter screen, and it is necessary to regularly disassemble and replace or disassemble and clean the filter screen, which will consume more time and labor costs. In addition, some sewage treatment devices are set in places that are not easy to contact with the outside world (such as buried underground), and their disassembly is difficult and inconvenient to use.

[0003] Chinese Patent CN2063842U discloses "a filter using a self-cleaning filter element", which realizes medium backwashing through a backwashing pump. However, this solution requires an additional backwashing pump, with a relatively complex structure and high cost. Summary of the Utility Model

[0004] In view of the above-mentioned disadvantages of the prior art, the purpose of the present utility model is to provide a sewage treatment device with a self-cleaning function, which is used to solve the problems that the existing backwashing filter device needs to additionally install a backwashing pump, resulting in a complex structure and increased cost.

[0005] To achieve the above object and other related objects, the present utility model provides a sewage treatment device with a self-cleaning function, including:

[0006] A housing, an inner cavity structure is formed inside the housing;

[0007] A filter cartridge, in a columnar shape, is arranged inside the housing, and the filter cartridge divides the inner cavity structure of the housing into an inner cavity and an outer cavity;

[0008] An inlet, arranged on one side of the upper part of the housing, is selectively communicated with the inner cavity or the outer cavity;

[0009] An outlet, arranged on the side opposite to the inlet at the upper part of the housing, is communicated with the outer cavity;

[0010] A drain port, arranged at the lower part of the housing, is communicated with the inner cavity;

[0011] A commutation mechanism, configured to receive a control signal and switch the inlet to be selectively communicated with the inner cavity or the outer cavity, so as to switch the water flow direction between two flow directions of flowing from the inner cavity to the outer cavity and flowing from the outer cavity to the inner cavity, so as to realize the switching between filtration and reverse flushing;

[0012] In the normal filtration mode, the drain port is closed, and the raw water enters the inner cavity from the inlet, passes through the filter cartridge and enters the outer cavity, and then flows out from the outlet;

[0013] In the backwashing mode, the water outlet is closed, and the raw water enters the outer cavity from the water inlet, passes through the filter cartridge into the inner cavity, and then flows out from the drain outlet.

[0014] In a preferred embodiment of the present application, the commutation mechanism includes a first connector and a second connector that are nested with each other and can rotate relative to each other. The first connector and the second connector are integrally cylindrical, forming a commutation valve structure with one inlet and two outlets; the second connector is communicated with the water inlet, and the first connector and the second connector rotate 90 degrees relative to each other to switch to communicate with the inner cavity or the outer cavity.

[0015] In a preferred embodiment of the present application, the first connector includes: a first cylinder body, which is located above the filter cartridge and is nested with the filter cartridge; a second cylinder body, which is located above the first cylinder body, and a first side liquid outlet hole is provided on the side wall of the second cylinder body; a first partition board, which is located between the first cylinder body and the second cylinder body, and a first lower liquid outlet hole is provided on the first partition board;

[0016] The second connector includes: a third cylinder body, which is nested with the second cylinder body and is in clearance fit with the second cylinder body to rotate relatively, and a second side liquid outlet hole with the same height as the first side liquid outlet hole is provided on the side wall of the third cylinder body; a second partition board, which is located above the first partition board, and a second lower liquid outlet hole is provided on the second partition board; a fourth cylinder body, which is located above the third cylinder body, and a liquid inlet hole is provided on the side wall of the fourth cylinder body;

[0017] When the first side liquid outlet hole coincides with the second side liquid outlet hole, the first lower liquid outlet hole and the second lower liquid outlet hole are arranged in a 90-degree circumferential dislocation; when the first lower liquid outlet hole coincides with the second lower liquid outlet hole, the first side liquid outlet hole and the second side liquid outlet hole are arranged in a 90-degree circumferential dislocation.

[0018] In a preferred embodiment of the present application, a columnar retaining wall is provided between the inner cavity and the outer cavity. The filter cartridge, the first connector, and the second connector are nested in the retaining wall in sequence from bottom to top. A first notch with the same height as the filter cartridge and communicated with the filter cartridge is provided at the lower part of the retaining wall. A second notch with the same height as the first side liquid outlet hole and the second side liquid outlet hole and communicated when the first side liquid outlet hole and the second side liquid outlet hole coincide is provided in the middle of the retaining wall. A third notch with the same height as the water inlet and communicated with the water inlet is provided on the side of the upper part of the retaining wall facing the water inlet.

[0019] In a preferred embodiment of the present application, a sensing assembly is further included, and the sensing assembly includes: a first pressure sensor disposed at the water inlet, a second pressure sensor disposed at the water outlet, and a control unit signal-connected to the first pressure sensor and the second pressure sensor. The control unit receives the pressure values of the first pressure sensor and the second pressure sensor and switches to the reverse flushing mode when the pressure difference exceeds a set threshold.

[0020] In a preferred embodiment of the present application, the commutation mechanism further includes: a driving member disposed at the top of the housing, a driving shaft of the driving member is connected to the second communicating vessel, and the driving member is signal-connected to the control unit and drives the second communicating vessel to rotate to switch the filtration mode or the reverse flushing mode.

[0021] In a preferred embodiment of the present application, a limiting groove is provided on the upper end surface of the housing, and the limiting groove is a sector with the rotation center of the driving member as the center of the circle and a central angle of 90 degrees; a limiting arm is connected to the driving shaft of the driving member, and the limiting arm is driven by the driving shaft to rotate and abut against the two side end surfaces of the limiting groove to form a rotation angle limit.

[0022] In a preferred embodiment of the present application, a solenoid valve signal-connected to the control unit is provided at the drain port, and the solenoid valve closes the drain port in the filtration mode and opens the drain port in the reverse flushing mode.

[0023] In a preferred embodiment of the present application, a power supply assembly is further included, and the power supply assembly is connected with a solar panel to provide power.

[0024] As described above, the sewage treatment device with a self-cleaning function of the present utility model has the following beneficial effects:

[0025] 1. By changing the structure itself, the change of the water flow direction can wash the filter substances attached to the surface of the filter cartridge, eliminating the need for frequent disassembly and cleaning or replacement of the filter cartridge, reducing the use cost and the time cost of filter cartridge maintenance;

[0026] 2. There is no need to additionally install a reverse flushing pump. The water source for flushing the filter cartridge comes from the raw water to be filtered, and reverse flushing can be achieved by changing the flow direction of the raw water, further reducing the equipment cost and simplifying the structure;

[0027] 3. The clogging of the filter cartridge is monitored by a pressure sensor, the switching between the normal filtration mode and the reverse flushing mode is achieved by the cooperation of the driving member and the solenoid valve, and the power source is provided by connecting the power supply assembly with a solar panel. Overall, the automation degree of the sewage treatment device is improved, and there is no need to use an external power source, which is energy-saving and environment-friendly. Description of the Drawings

[0028] Figure 1Shown is a schematic diagram of a sewage treatment device with a self-cleaning function according to an embodiment of the present application in a normal filtration mode.

[0029] Figure 2 Shown is a partially enlarged schematic diagram of a reversing mechanism of a sewage treatment device with a self-cleaning function according to an embodiment of the present application in a normal filtration mode.

[0030] Figure 3 Shown is a partially enlarged schematic diagram of a reversing mechanism of a sewage treatment device with a self-cleaning function according to an embodiment of the present application in a reverse flushing mode.

[0031] Figure 4 Shown as Figure 1 the A-A side view of

[0032] Explanation of reference numerals

[0033] 1. Housing; 11. Inner cavity; 12. Outer cavity; 13. Baffle wall; 131. First notch; 132. Second notch; 133. Third notch; 2. Filter cartridge; 3. Water inlet; 4. Water outlet; 5. Drain port; 51. Solenoid valve; 6. Reversing mechanism; 61. First connector; 611. First cylinder; 612. Second cylinder; 613. First partition; 614. First side liquid outlet hole; 615. First lower liquid outlet hole; 62. Second connector; 621. Third cylinder; 622. Second partition; 623. Fourth cylinder; 624. Second side liquid outlet hole; 625. Second lower liquid outlet hole; 626. Liquid inlet hole; 63. Driving member; 64. Limiting groove; 65. Limiting arm. Detailed implementation manners

[0034] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. Additionally, it should be noted that for the sake of description, only parts related to the present utility model are shown in the drawings rather than all structures.

[0035] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0036] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include direct contact between the first and second features, or may include the first and second features not being in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over", and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath", and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is less than that of the second feature.

[0037] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "left", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0038] Please refer to Figures 1-3 , the present utility model provides a sewage treatment device with a self-cleaning function, including:

[0039] A housing 1, within which a cavity structure is formed;

[0040] A filter cartridge 2, which is cylindrical and is disposed within the housing 1. The filter cartridge 2 divides the cavity structure of the housing 1 into an inner cavity 11 and an outer cavity 12;

[0041] An inlet 3, which is disposed on one side of the upper part of the housing 1 and is selectively communicable with either the inner cavity 11 or the outer cavity 12;

[0042] An outlet 4, which is disposed on the side of the upper part of the housing 1 opposite to the inlet 3 and is communicable with the outer cavity 12;

[0043] A drain port 5, which is disposed at the lower part of the housing 1 and is communicable with the inner cavity 11;

[0044] A commutation mechanism 6, configured to receive a control signal and switch the inlet 3 to selectively communicate with either the inner cavity 11 or the outer cavity 12, so as to switch the water flow direction between two directions: flowing from the inner cavity 11 to the outer cavity 12 and flowing from the outer cavity 12 to the inner cavity 11, in order to achieve the switching between filtration and backwashing;

[0045] In the normal filtration mode, the drain port 5 is closed, and raw water enters the inner cavity 11 from the inlet 3, passes through the filter cartridge 2 and enters the outer cavity 12, and then flows out from the outlet 4;

[0046] In the backwashing mode, the water outlet 4 is closed, and raw water enters the outer cavity 12 from the water inlet 3, passes through the filter cartridge 2 into the inner cavity 11, and then flows out from the drain port 5.

[0047] Specifically, the commutation mechanism 6 includes a first connector 61 and a second connector 62 that are nested and relatively rotatable. The first connector 61 and the second connector 62 are integrally cylindrical, forming a commutation valve structure with one inlet and two outlets; the second connector 62 is connected to the water inlet 3, and the first connector 61 and the second connector 62 rotate relative to each other by 90 degrees each time to switch to communicate with the inner cavity 11 or the outer cavity 12.

[0048] More specifically, the first connector 61 includes: a first cylinder 611, located above the filter cartridge 2 and nested with the filter cartridge 2; a second cylinder 612, located above the first cylinder 611, and a first side liquid outlet hole 614 is provided on the side wall of the second cylinder 612; a first partition 613, located between the first cylinder 611 and the second cylinder 612, and a first lower liquid outlet hole 615 is provided on the first partition 613;

[0049] The second connector 62 includes: a third cylinder 621, nested with the second cylinder 612 and having a clearance fit with the second cylinder 612 for relative rotation, and a second side liquid outlet hole 624 at the same height as the first side liquid outlet hole 614 is provided on the side wall of the third cylinder 621; a second partition 622, located above the first partition 613, and a second lower liquid outlet hole 625 is provided on the second partition 622; a fourth cylinder 623, located above the third cylinder 621, and a liquid inlet hole 626 is provided on the side wall of the fourth cylinder 623;

[0050] When the first side liquid outlet hole 614 coincides with the second side liquid outlet hole 624, the first lower liquid outlet hole 615 and the second lower liquid outlet hole 625 are arranged in a 90-degree circumferential offset; when the first lower liquid outlet hole 615 coincides with the second lower liquid outlet hole 625, the first side liquid outlet hole 614 and the second side liquid outlet hole 624 are arranged in a 90-degree circumferential offset.

[0051] In this way, through the relative rotation of the first connector 61 and the second connector 62, the switching of the alignment position can be realized, that is, every time the first connector 61 and the second connector 62 rotate relative to each other by 90 degrees, the first side liquid outlet hole 614 is aligned with the second side liquid outlet hole 624 or the first lower liquid outlet hole 615 is aligned with the second lower liquid outlet hole 625.

[0052] Among them, there are two first side liquid outlet holes 614, which are oppositely arranged on the side wall of the second cylinder body 612, and two second side liquid outlet holes 624, which are oppositely arranged on the side wall of the third cylinder body 621; the first lower liquid outlet hole 615 is specifically a sector-shaped hole or an arc-shaped hole with a central angle of 90 degrees, and the number is two, which are oppositely arranged on the first partition plate 613. The second lower liquid outlet hole 625 is specifically a sector-shaped hole or an arc-shaped hole with a central angle of 90 degrees, and the number is two, which are oppositely arranged on the second partition plate 622; the liquid inlet holes 626 are several and are evenly distributed on the side wall of the fourth cylinder body 623.

[0053] It should be noted that a columnar retaining wall 13 is arranged between the inner cavity body 11 and the outer cavity body 12. The filter cartridge 2, the first connector 61, and the second connector 62 are nested in the retaining wall 13 in sequence from bottom to top. A first notch 131 with the same height as the filter cartridge 2 and communicating with the filter cartridge 2 is arranged at the lower part of the retaining wall 13. A second notch 132 with the same height as the first side liquid outlet hole 614 and the second side liquid outlet hole 624 and communicating when the first side liquid outlet hole 614 and the second side liquid outlet hole 624 coincide is arranged in the middle of the retaining wall 13. A third notch 133 with the same height as the water inlet 3 and communicating with the water inlet 3 is arranged on the upper part of the retaining wall 13 facing the water inlet 3 side.

[0054] In addition, it further includes a sensing assembly. The sensing assembly includes: a first pressure sensor arranged at the water inlet 3, a second pressure sensor arranged at the water outlet 4, and a control unit signal-connected to the first pressure sensor and the second pressure sensor. The control unit receives the pressure values of the first pressure sensor and the second pressure sensor and switches to the reverse flushing mode when the pressure difference exceeds the set threshold.

[0055] In this way, when the water pressure difference between the water inlet 3 and the water outlet 4 is relatively small, it indicates that there is less filter residue attached to the surface of the filter cartridge 2, and it is in the normal filtration mode; when the water pressure difference between the water inlet 3 and the water outlet 4 is relatively large, it indicates that there is more filter residue attached to the surface of the filter cartridge 2. Until the water pressure difference exceeds the set threshold, the water flow direction is controlled to change, and it switches to the reverse flushing mode.

[0056] It should be noted that the commutation mechanism 6 further includes: a driving member 63 arranged at the top of the housing 1. The driving shaft of the driving member 63 is connected to the second connector 62. The driving member 63 is signal-connected to the control unit and drives the second connector 62 to rotate to switch the filtration mode or the reverse flushing mode.

[0057] Among them, the driving member 63 is specifically a motor.

[0058] In this way, the driving member 63 receives the signal of the sensing assembly to control the relative positions of the first connector 61 and the second connector 62, and realizes the automatic switching between the normal filtration mode and the reverse flushing mode.

[0059] Please refer toFigure 4 On the upper end face of the housing 1, a limit groove 64 is provided. The limit groove 64 is a sector with the rotation center of the driving member 63 as the center of the circle and a central angle of 90 degrees. A limit arm 65 is connected to the driving shaft of the driving member 63. The limit arm 65 is driven by the driving shaft to rotate and abut against the two side end faces of the limit groove 64 to form a rotation angle limit.

[0060] A solenoid valve 51 signal-connected to the control unit is provided at the drain port 5. The solenoid valve 51 closes the drain port 5 in the filtration mode and opens the drain port 5 in the reverse flushing mode.

[0061] Specifically, when the sewage treatment device is used for an underground pipeline, the drain port 5 can be directly connected to an existing underground drainage pipeline.

[0062] It further includes a power supply assembly. The power supply assembly is connected with a solar panel to provide power. Specifically, a storage battery can be electrically connected to a solar panel.

[0063] In this way, there is no need for additional power connection. Moreover, even if the sewage treatment device is buried deep underground for use in an underground pipeline, the solar panel can be exposed on the ground surface and connected to the sewage treatment device through a long cable.

[0064] When there is less filter residue attached to the surface of the filter cartridge 2, it is in the normal filtration mode: raw water enters from the water inlet 3 and enters the second communicating vessel 62 through the liquid inlet hole 626. At this time, the first side liquid outlet hole 614 and the second side liquid outlet hole 624 are misaligned, and the first lower liquid outlet hole 615 and the second lower liquid outlet hole 625 are aligned. The water flow in the second communicating vessel 62 can only flow downward into the inner cavity 11 through the first lower liquid outlet hole 615 and the second lower liquid outlet hole 625. The water passes through the filter cartridge 2 and flows into the outer cavity 12 from the inner cavity 11, while the solid filter residue is blocked by the filter cartridge 2 and remains in the inner cavity 11. Finally, the filtered water flows out from the water outlet 4.

[0065] When there is more filter residue attached to the surface of the filter cartridge 2, it is necessary to switch to the reverse flushing mode: the driving member 63 drives the second communicating vessel 62 to rotate 90 degrees. At this time, the first side liquid outlet hole 614 and the second side liquid outlet hole 624 are aligned, and the first lower liquid outlet hole 615 and the second lower liquid outlet hole 625 are misaligned. At the same time, the solenoid valve 51 is opened to open the drain port 5;

[0066] In the reverse flushing mode: raw water enters from the water inlet 3, enters the second communicating vessel 62 through the liquid inlet hole 626, and flows outwards into the outer cavity 12 through the first side liquid outlet hole 614 and the second side liquid outlet hole 624. The water passes through the filter cartridge and flows into the inner cavity 11 from the outer cavity 12, and the solid filter residue attached to the inner side wall of the filter cartridge 2 is washed off from the surface of the filter cartridge 2 by the water flow. Finally, the waste water mixed with the solid filter residue flows downward from the drain port 5.

[0067] In summary, through the change of its own structure, the utility model enables the change of the water flow direction to wash the filter substances attached to the surface of the filter cartridge, eliminating the need for frequent disassembly and washing or replacement of the filter cartridge, reducing the use cost and the time cost of filter cartridge maintenance; there is no need to additionally install a reverse flushing pump, and the water source for flushing the filter cartridge comes from the raw water to be filtered, and reverse flushing can be achieved by changing the flow direction of the raw water, further reducing the equipment cost and simplifying the structure; the blockage of the filter cartridge is monitored through a pressure sensor, the switching between the normal filtration mode and the reverse flushing mode is achieved through the cooperation of a driving member and a solenoid valve, and the power source is connected to a solar panel through a power supply component to provide a power source, overall improving the automation degree of the sewage treatment device, without the need to use an external power source, being energy-saving and environment-friendly. Therefore, the utility model effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0068] The above embodiments are only illustrative of the principles and effects of the utility model, and are not intended to limit the utility model. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the utility model. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the utility model should still be covered by the claims of the utility model.

Claims

1. A sewage treatment device with self-cleaning function, characterized in that: include: A housing (1), wherein a cavity structure is formed inside the housing (1); The filter cartridge (2) is columnar and is disposed in the housing (1); the filter cartridge (2) divides the cavity structure of the housing (1) into an inner cavity (11) and an outer cavity (12); A water inlet (3) is arranged on one side of the upper part of the housing (1) and can be selectively connected to the inner cavity (11) or the outer cavity (12); A water outlet (4) is arranged on a side of the upper portion of the housing (1) opposite to the water inlet (3) and is in communication with the outer cavity (12); A drain port (5) is disposed at the lower portion of the housing (1) and is in communication with the inner cavity (11); The reversing mechanism (6) is configured to receive a control signal and switch the water inlet (3) to selectively connect to the inner cavity (11) or the outer cavity (12), so as to switch the water flow direction between two flow directions: the inner cavity (11) flows to the outer cavity (12), and the outer cavity (12) flows to the inner cavity (11), so as to realize the switching between filtering and backwashing; The reversing mechanism (6) comprises a first communicating vessel (61) and a second communicating vessel (62) which are nested with each other and can rotate relative to each other. The first communicating vessel (61) and the second communicating vessel (62) are cylindrical as a whole, forming a reversing valve structure with one inlet and two outlets. The second communicating vessel (62) is connected to the water inlet (3). The first communicating vessel (61) and the second communicating vessel (62) rotate relative to each other by 90 degrees to switch to communication with the inner cavity (11) or the outer cavity (12).

2. A sewage treatment device with self-cleaning function according to claim 1, characterized in that: The first communicating vessel (61) comprises: a first cylinder (611), located above the filter cartridge (2) and nested with the filter cartridge (2); a second cylinder (612), located above the first cylinder (611), the side wall of the second cylinder (612) being provided with a first side liquid outlet (614); a first partition (613), located between the first cylinder (611) and the second cylinder (612), the first partition (613) being provided with a first lower liquid outlet (615); The second communicating vessel (62) comprises: a third cylinder (621) nested with the second cylinder (612) and loosely matched with the second cylinder (612) for relative rotation, the side wall of the third cylinder (621) being provided with a second side liquid outlet (624) at the same height as the first side liquid outlet (614); a second partition (622) located above the first partition (613), the second partition (622) being provided with a second lower liquid outlet (625); a fourth cylinder (623) located above the third cylinder (621), the side wall of the fourth cylinder (623) being provided with a liquid inlet (626); When the first side liquid outlet hole (614) is rotated to overlap with the second side liquid outlet hole (624), the first lower liquid outlet hole (615) and the second lower liquid outlet hole (625) are staggered at 90 degrees along the circumferential direction; when the first lower liquid outlet hole (615) and the second lower liquid outlet hole (625) are rotated to overlap with each other, the first side liquid outlet hole (614) and the second side liquid outlet hole (624) are staggered at 90 degrees along the circumferential direction.

3. A sewage treatment device with self-cleaning function according to claim 2, characterized in that: A columnar retaining wall (13) is provided between the inner cavity (11) and the outer cavity (12); the filter cartridge (2), the first communicating vessel (61) and the second communicating vessel (62) are nested in the retaining wall (13) in sequence from bottom to top; a first notch (131) is provided at the lower part of the retaining wall (13) at the same height as the filter cartridge (2) and in communication with the filter cartridge (2); a second notch (132) is provided at the middle part of the retaining wall (13) at the same height as the first side liquid outlet hole (614) and the second side liquid outlet hole (624) and in communication when the first side liquid outlet hole (614) and the second side liquid outlet hole (624) overlap; and a third notch (133) is provided at the upper part of the retaining wall (13) facing the water inlet (3) and in communication with the water inlet (3).

4. A sewage treatment device with self-cleaning function according to claim 3, characterized in that: The invention also comprises a sensor assembly, wherein the sensor assembly comprises: a first pressure sensor arranged at the water inlet, a second pressure sensor arranged at the water outlet (4), and a control unit connected to the signals of the first pressure sensor and the second pressure sensor, wherein the control unit receives the pressure values ​​of the first pressure sensor and the second pressure sensor and switches to a backwashing mode when the pressure difference exceeds a set threshold.

5. A sewage treatment device with self-cleaning function according to claim 4, characterized in that: The reversing mechanism (6) further comprises: a driving member (63) arranged at the top of the housing (1); a driving shaft of the driving member (63) is connected to the second communicating vessel (62); a signal of the driving member (63) is connected to the control unit and drives the second communicating vessel (62) to rotate so as to switch between a filtering mode and a backwashing mode.

6. A sewage treatment device with self-cleaning function according to claim 5, characterized in that: The upper end surface of the shell (1) is provided with a limiting groove (64), and the limiting groove (64) is in the shape of a sector with the rotation center of the driving member (63) as the center and a central angle of 90 degrees; the driving shaft of the driving member (63) is connected to a limiting arm (65), and the limiting arm (65) is driven by the driving shaft to rotate so as to abut against the end surfaces on both sides of the limiting groove (64) to form a rotation angle limit.

7. A sewage treatment device with self-cleaning function according to claim 6, characterized in that: The drain port (5) is provided with a solenoid valve (51) connected to the control unit signal, and the solenoid valve (51) closes the drain port (5) in the filtering mode and opens the drain port (5) in the backwashing mode.

8. The sewage treatment device with self-cleaning function according to claim 4, characterized in that: A power supply component is also included, and the power supply component is connected to a solar panel to provide electricity.

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