CN108619771A - Backpulsing self-cleaning filter - Google Patents

Abstract

The invention provides a recoil type self-cleaning filter, which comprises an outer cylinder with an outer cylinder water inlet for the filtered water to enter; an outer cylinder water inlet pipe connected to the outer cylinder water inlet, and the outer cylinder water inlet pipe is close to the outer cylinder The direction of the water flow in one end of the cylinder is tangent to the rotation direction of the water flow in the outer cylinder; the filter cylinder is installed inside the outer cylinder; the water axis pipe is installed in the filter cylinder, and the water axis pipe has a recoil inlet for inputting clean water , and the water axis tube is provided with a water outlet structure communicating with it; and a driving structure for driving the water axis tube to rotate. The recoil type self-cleaning filter provided by the present invention generates a spin flow after the filtered water enters the outer cylinder, tangentially washes away the impurities adhered to the filter cylinder, reduces the adhesion of impurities, and passes through the filter cylinder. Equipped with a water axis pipe and a water outlet structure, the water flow is ejected from the inner wall of the filter cartridge toward the outer wall of the filter cartridge, and the impurities adhered to the outer wall of the filter cartridge are effectively taken away by the recoil effect.

Description

Backflush self-cleaning filter

technical field

The invention belongs to the technical field of filter devices, and more specifically relates to a recoil type self-cleaning filter.

Background technique

Water filtration is an essential core link in the water treatment industry. Filtration refers to the separation and interception of impurities in water through physical means such as filters to improve water quality. The separated impurities are easy to accumulate on the filter screen under continuous filtration, causing the impurities to block the filter screen, making it difficult for water to pass through the filter screen, and the pressure on the filter screen is constantly increasing. In order to ensure the normal operation of the filter, it is necessary to clean the filter regularly to clear the impurities on the filter and restore the filter performance of the filter. There are two ways to clean the filter screen: manual cleaning and automatic cleaning. In the current self-cleaning filter structure, first, impurities are easily adsorbed on the filter net, and the cleaning frequency increases; second, when there are various types of impurities or low-pressure operation, the self-cleaning effect is poor, and the cleaning standards and requirements cannot be met.

Contents of the invention

The purpose of the present invention is to provide a recoil type self-cleaning filter to solve the technical problems in the prior art that impurities are easily adsorbed on the filter net and the self-cleaning effect is poor.

In order to achieve the above object, the technical solution adopted in the present invention is to provide a backflushing self-cleaning filter, comprising:

The outer cylinder has an outer cylinder water inlet for the water to be filtered, and a sewage outlet for discharging impurities;

The water inlet pipe of the outer cylinder is connected to the water inlet of the outer cylinder, and the direction of the water flow in the end of the water inlet pipe of the outer cylinder close to the outer cylinder is tangent to the rotation direction of the water flow in the outer cylinder;

A filter cartridge is used for filtering water, the filter cartridge is arranged inside the outer cylinder, and the filter cartridge has a filter cartridge water outlet for clear water to flow out;

A water axis tube, which is installed in the filter cartridge, the water axis tube has a recoil water inlet for inputting clean water, and the water axis tube is provided with a water outlet structure connected thereto; and

The driving structure is connected with the water axis tube and is used to drive the water axis tube to rotate.

Further, the water outlet structure includes a plurality of nozzles fixed on the outer wall of the water axis tube, and the nozzles communicate with the water axis tube.

Further, the water outlet structure further includes a connecting pipe connecting the water axis pipe and the nozzle.

Further, the nozzle is conical, and the conical bottom of the nozzle is arranged towards the filter cartridge.

Further, the water outlet of the filter cartridge is in communication with the backwash water inlet, and a backwash water pump is arranged between the water outlet of the filter cartridge and the backwash water inlet.

Further, a pressure sensor for testing water pressure is provided inside the filter cartridge, and the pressure sensor is electrically connected to the driving structure.

Further, the outer cylinder water inlet and the sewage outlet are respectively provided on opposite sides of the outer cylinder in its axial direction.

Further, a sewage discharge pipe is connected to the sewage discharge port, and a sewage discharge valve is arranged on the sewage discharge pipe.

Further, the outer cylinder includes an outer cylinder body, an upper sealing plate fixed on the top of the outer cylinder body, and a lower sealing plate fixed on the bottom of the outer cylinder body, and the water inlet of the outer cylinder is opened on the outer On the cylinder body, the sewage outlet is opened on the lower sealing plate, and the filter cartridge is set through the upper sealing plate, the outer cylinder body, and the lower sealing plate in sequence.

Further, the filter cartridge includes a filter cartridge body, an upper cover plate fixed on the top of the filter cartridge body, and a lower cover plate fixed on the bottom of the filter cartridge body, and the water outlet of the filter cartridge is opened on the lower cover plate. cover plate.

The beneficial effect of the backflushing self-cleaning filter provided by the present invention is that compared with the prior art, the backflushing self-cleaning filter of the present invention is provided with an outer cylinder water inlet pipe connected to the outer cylinder, and the outer cylinder water inlet pipe is close to The direction of the water flow at one end of the outer cylinder is tangent to the rotation direction of the water flow in the outer cylinder, so that after the water to be filtered enters the outer cylinder through the water inlet pipe of the outer cylinder, a spin flow is generated, and the spin flow rotates around the central axis of the outer cylinder. During the process, the impurities adhered to the filter cartridge are washed tangentially, reducing the adhesion of impurities on the filter cartridge, and effectively reducing the frequency of filter cartridge cleaning; at the same time, the filter cartridge is equipped with a rotatable water shaft tube and a water outlet structure. , clean water can be rotated and sprayed towards the filter cartridge after passing through the water axis tube and the water outlet structure, and the water flow is sprayed from the inner wall of the filter cartridge towards the outer wall of the filter cartridge, effectively taking away the adhesion on the outer wall of the filter cartridge through the recoil effect impurities to ensure the cleaning effect.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the descriptions of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only of the present invention. For some embodiments, those of ordinary skill in the art can also obtain other drawings based on these drawings without paying creative efforts.

Fig. 1 is the structure schematic diagram when the recoil type self-cleaning filter filter that the embodiment of the present invention provides;

Fig. 2 is the top view of the recoil type self-cleaning filter provided by the embodiment of the present invention;

Fig. 3 is a schematic structural view of the backflushing self-cleaning filter provided by the embodiment of the present invention during self-cleaning.

Wherein, each reference sign in the figure:

1-outer cylinder; 11-upper sealing plate; 12-outer cylinder body; 121-water inlet of outer cylinder; 122-drainage outlet; 123-drainage pipe; 124-drainage valve; 2-filter cartridge; 21-upper cover plate; 22-filter cylinder body; 23-lower cover plate; 230-filter cartridge water outlet; 24-water intake pipe; 3-water axis pipe; 31-recoil water inlet; 4-water outlet structure; 41-connecting pipe; 42-nozzle; 5-driving structure; 6-recoil water pipe; 7-recoil water pump.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

It should be noted that when an element is referred to as being “fixed” or “disposed on” another element, it may be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

It is to be understood that the terms "length", "width", "top", "bottom", "front", "rear", "left", "right", "vertical", "horizontal", "top" , "bottom", "inner", "outer" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the referred device Or elements must have a certain orientation, be constructed and operate in a certain orientation, and thus should not be construed as limiting the invention.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

Please refer to Fig. 1 to Fig. 3 together, and now the backflushing self-cleaning filter provided by the present invention will be described. The recoil type self-cleaning filter includes an outer cylinder 1, a filter cylinder 2 arranged inside the outer cylinder 1, the outer cylinder 1 has an outer cylinder water inlet 121 for the water to be filtered to enter, and a water inlet 121 for discharging filtered water. The sewage outlet 122 for impurities, and the filter cartridge 2 has a filter cartridge water outlet 230 for clear water to flow out. Figure 1 shows the state of water flow inside the filter during filtration, and the direction of the arrow is the direction of water flow. Specifically, the water inlet 121 of the outer cylinder is connected with the water inlet pipe 125 of the outer cylinder. The water inlet pipe 125 of the outer cylinder is close to one end of the outer cylinder 1, and the water flow direction inside it is tangent to the rotation direction of the water flow in the outer cylinder 1. The water flow direction refers to the flow direction of the water flow between the filter cartridge 2 and the outer cylinder 1. Since the water inlet direction of the outer cylinder water inlet 121 is the same as the length direction of the outer cylinder water inlet pipe 125 near the outer cylinder 1, the water to be filtered flowing into the outer cylinder 1 rotates around the axis direction of the outer cylinder 1 under the shielding effect of the inner wall of the outer cylinder 1 , to generate a spin flow, driven by continuous water pressure, the water to be filtered flows from the outer cylinder 1 to the inside of the filter cartridge 2, and the filter cartridge 2 blocks the impurities in the water to be filtered on its outside, and the water entering the filter cartridge 2 After being filtered, it becomes clear water, and the clear water flows out through the water outlet 230 of the filter cartridge to complete the filtration. The recoil type self-cleaning filter also includes a water axis tube 3 and a driving structure 5 arranged in the filter cartridge 2, the water axis tube 3 has a recoil water inlet 31 for inputting clean water, and the water axis tube 3 also has a The connected water outlet structure 4 and the driving structure 5 are connected with the water axis tube 3 and used to drive the water axis tube 3 to rotate. Shown in Fig. 3 is the water flow state inside the filter during self-cleaning, and the direction of the arrow is the water flow direction, and when self-cleaning the filter, the driving structure 5 drives the water axis tube 3 to rotate, and the filter cartridge 2 and the outer cylinder 1 remain motionless. Clean water is input into the water axis pipe 3, and is sprayed out from the water outlet structure 4 under the action of water pressure, and the sprayed water flow is reversely sprayed from the inside of the filter cartridge 2 toward the outside of the filter cartridge 2, forming a rotating jet of water to rinse the filter cartridge 2, the impurities are washed away from the filter cartridge 2, and rotate and flow outside the filter cartridge 2 until they are discharged from the sewage outlet 122. During the cleaning process, the water to be filtered can be continuously pumped into the water inlet 121 of the outer cylinder, and the rotation direction of the water axis tube 3 is the same as that of the water to be filtered in the outer cylinder 1. Under the action, the entire surface of the filter cartridge 2 is fully cleaned, and during the self-cleaning process, the filter is still filtering continuously, and the filtering and cleaning are performed simultaneously, which improves the filtering efficiency.

The recoil self-cleaning filter provided by the present invention, compared with the prior art, the recoil self-cleaning filter of the present invention is provided with the outer cylinder water inlet pipe 125 connected with the outer cylinder 1, and the outer cylinder water inlet pipe 125 is close to the outer cylinder. The direction of the water flow at one end of the cylinder 1 is tangent to the rotation direction of the water flow in the outer cylinder 1, so that after the water to be filtered enters the outer cylinder 1 through the water inlet pipe 125 of the outer cylinder, a spin flow is generated, and the spin flow revolves around the central axis of the outer cylinder 1 Rotate, tangentially wash away the impurities adhering to the filter cartridge 2 during the filtering process, reduce the adhesion of impurities on the filter cartridge 2, and effectively reduce the cleaning frequency of the filter cartridge 2; at the same time, the filter cartridge 2 is equipped with a The water axis tube 3 and the water outlet structure 4 rotated under the action of the driving structure 5, the clear water can be sprayed towards the filter cartridge 2 after passing through the water axis tube 3 and the water outlet structure 4, and the water flow is reversed from the inner wall of the filter cartridge 2 toward the outer wall of the filter cartridge 2 Spraying to the rotation, the impurities adhered to the outer wall of the filter cartridge 2 are effectively taken away by the recoil action, so as to ensure the cleaning effect.

Further, please refer to FIG. 2 , as a specific embodiment of the recoil self-cleaning filter provided by the present invention, the central axis of the outer cylinder water inlet pipe 125 is set as the water inlet axis, and the outer wall of the filter cartridge 2 is parallel to the water inlet axis. The tangent line is set as the tangent line of the filter cylinder 2, the tangent line parallel to the water inlet axis at the inner wall of the outer cylinder 1 is set as the tangent line of the outer cylinder 1, and the water inlet axis is set between the tangent line of the filter cylinder 2 and the tangent line of the outer cylinder 1, so that the water entering the outer cylinder Most of the water flow in 1 directly enters between the filter cylinder 2 and the outer cylinder 1, and it is easier to form a spin flow. Optionally, the central axes of the outer cylinder 1, the filter cylinder 2 and the water axis pipe 3 coincide with each other, so that the spin flow receives the same force when it enters the filter cylinder 2 from all directions and positions, so that the impurities on the surface of the filter cylinder 2 The distribution position and quantity are roughly the same, so as to realize the maximum utilization of the filter cartridge 2; in addition, the rotating water flow sprayed from the water axis pipe 3 has the same force direction in all directions and positions on the filter cartridge 2 and the outer cylinder 1 , to more effectively remove impurities adhering to the entire surface of the filter cartridge 2.

Please refer to Fig. 1 and Fig. 3, as a kind of embodiment of the recoil type self-cleaning filter provided by the present invention, the water outlet structure 4 comprises the nozzle 42 that is fixed on the outer wall of the water axis pipe 3, and the nozzle 42 is connected with the water axis pipe 3 Connected, after the clean water enters the water axis pipe 3, the clean water is sprayed from the nozzle 42, and the nozzle 42 is provided with a plurality of small holes, and the clean water forms a high-pressure water flow under the action of the small holes, and flows from the inside of the filter cartridge 2 toward the bottom of the filter cartridge 2. External spraying, and the rotating jet flow is formed under the action of the rotation of the water axis tube 3. In this embodiment, the nozzle 42 further increases the injection pressure of the water flow, making it easier for impurities to fall off the filter cartridge 2 . There may be multiple nozzles 42, and the specific number is not limited here. A plurality of nozzles 42 are preferably arranged in a spiral along the outer wall of the water axis tube 3 so as to clean all parts of the filter cartridge 2 as much as possible.

Please continue to refer to Fig. 1 and Fig. 3, as a kind of embodiment of the recoil type self-cleaning filter provided by the present invention, the nozzle 42 is conical, and the conical top of the nozzle 42 is connected with the water axis pipe 3, and the cone of the nozzle 42 The bottom is arranged toward the filter cartridge 2, and the small holes on the nozzle 42 are arranged at the conical bottom of the nozzle 42, so that the water flow ejected from a single nozzle 42 is conically ejected outward. This nozzle 42 structure can increase the number of small holes on the one hand; on the other hand, it can increase the radiation area of the sprayed water flow of a single nozzle 42 and increase the area that a single nozzle 42 can clean.

Please continue to refer to FIG. 1 and FIG. 3 , as a specific embodiment of the backflushing self-cleaning filter provided by the present invention, the water outlet structure 4 further includes a connecting pipe 41 connecting the water axis pipe 3 and the nozzle 42 . In this way, the clean water flows through the water axis pipe 3 and the connecting pipe 41 in sequence, and then sprays out from the nozzle 42 . The setting of the connecting pipe 41 shortens the distance between the nozzle 42 and the inner wall of the filter cartridge 2, so the pressure of the water flow reaching the filter cartridge 2 after being ejected from the nozzle 42 increases indirectly, which is more conducive to washing down the stubborn impurities that adhere tightly. Preferably, the length direction of the connecting pipe 41 is the same as the radial direction of the water axis pipe 3 . In this embodiment, the water axis pipe 3 is arranged vertically, the connecting pipe 41 is arranged horizontally, and the central axis of the connecting pipe 41 passes through the axis of the water axis pipe 3 . The number of connecting pipes 41 is the same as the number of nozzles 42 , and each connecting pipe 41 is correspondingly connected with a nozzle 42 . The connecting pipe 41 is made of hard material, and its specific material is not limited here.

Please continue to refer to Fig. 1 and Fig. 3, as a specific embodiment of the recoil self-cleaning filter provided by the present invention, the filter cartridge water outlet 230 is connected with the recoil water inlet 31, and the filter cartridge water outlet 230 is connected to the recoil water inlet 31. A recoil water pump 7 is provided between the water inlets 31 . Filter cartridge water outlet 230 and recoil water pump 7, recoil water pump 7 and recoil water inlet 31 are all communicated by recoil water pipe 6, and filter water outlet can be connected with water intake pipe 24, which is convenient to obtain clean water. Filtered clean water flows out of the outlet 230 of the filter cartridge, and the filtered clean water is directly pumped into the water shaft tube 3 through the backwash water pump 7, and there is no need to clean the filter cartridge 2 with clean water from the outside. Clear water is all that is needed, which simplifies the structure of the self-cleaning filter. During self-cleaning, the water to be filtered is continuously pumped into the outer cylinder 1 to provide a steady stream of clean water for the water axis tube 3. In addition, the spin flow in the outer cylinder 1 can also cooperate with the water jetted by the water spray, and the The impurities washed down do a downward rotary motion, and the concentrated impurities are discharged from the sewage outlet 122 . The backwash water pump 7 is a high-pressure water pump, which is used to increase the pressure of the water flow, so that the injection water pressure at the nozzle 42 is greater.

Please continue to refer to Fig. 1 and Fig. 3, as a specific embodiment of the backflushing self-cleaning filter provided by the present invention, the water inlet 121 and the sewage outlet 122 of the outer cylinder are respectively arranged at the ends of the outer cylinder 1 in the axial direction. opposite sides. In this embodiment, the water inlet 121 of the outer cylinder is arranged at the upper end of the outer cylinder 1 , and the sewage outlet 122 is arranged at the lower end of the outer cylinder 1 . After the water to be filtered enters the outer cylinder 1 from the water inlet 121 of the outer cylinder to form a spin flow, and after the jet water flow during self-cleaning forms a rotating jet water flow in the outer cylinder 1, under the joint action of gravity and water pressure, the water flow flows from the top With the downward spiral movement, the impurities will gradually deposit on the lower end of the outer cylinder 1 and be discharged through the sewage outlet 122 located at the lower end of the outer cylinder 1 . This kind of setting method reasonably utilizes the effect of gravity, so that impurities are gathered at the sewage outlet 122, and the effect of removing impurities is enhanced.

Please continue to refer to FIG. 1 and FIG. 3 , as a specific embodiment of the recoil self-cleaning filter provided by the present invention, a sewage discharge pipe 123 is provided at the sewage outlet 122 , and a sewage discharge valve 124 is provided on the sewage discharge pipe 123 . When the filter is filtering, the drain valve 124 is closed, and the filtered water is discharged and collected through the water outlet 230 of the filter cartridge; The drain valve 124 can optionally be a solenoid valve.

As a specific embodiment of the backflushing self-cleaning filter provided by the present invention, the self-cleaning filter also includes a control device (not marked in the figure), and the control device includes a pressure sensor (not marked in the figure) for testing the water pressure. Mark), the pressure sensor is arranged in the filter cartridge 2, and the pressure sensor is electrically connected with the driving structure 5. In this embodiment, the control device is also electrically connected to the backwash water pump 7 and the drain valve 124 . When the filter is in continuous operation, more and more impurities are intercepted by the filter cartridge 2, and the filter cartridge 2 is gradually blocked, so that the amount of water flowing through the filter cartridge 2 decreases, the pressure inside the filter cartridge 2 drops, and the pressure sensor detects When the pressure is less than the predetermined value, the signal is transmitted to the control device, and the control device issues instructions to start the driving structure 5, start the backwash water pump 7, open the drain valve 124, and complete the preparation for self-cleaning; after a period of self-cleaning After the pressure sensor detects that the pressure returns to normal, the control device issues instructions to close the driving structure 5, close the backwash water pump 7, close the blowdown valve 124, and continue to filter. In this way, the automatic control of self-cleaning is realized. After the pressure sensor is added, the pressure value of the filter cartridge 2 can be automatically detected, and it is judged whether cleaning is required by the pressure value, without manual control of cleaning. Optionally, there are a plurality of pressure sensors, which are evenly distributed on the inner wall of the filter cartridge 2. Since the pressures at various parts of the filter cartridge 2 may be different, the pressure values detected by the pressure sensors are also different, and each pressure sensor can detect The average value of the pressure is compared with the predetermined pressure value to judge whether it needs to be cleaned.

Referring to Fig. 1 and Fig. 3, as a specific embodiment of the recoil self-cleaning filter provided by the present invention, the outer cylinder 1 includes an outer cylinder body 12, an upper sealing plate 11 and a lower sealing plate 13, and the upper sealing plate 11 and the lower sealing plate 13 are respectively fixed on the top and the bottom of the outer cylinder body 12, which can reduce the difficulty of manufacturing the outer cylinder 1. The outer cylinder body 12 is in sealing connection with the upper sealing plate 11 , and the outer cylinder body 12 and the lower sealing plate 13 . The outer cylinder water inlet 121 is opened on the outer cylinder body 12, preferably the upper end of the outer cylinder body 12, the sewage outlet 122 is opened on the lower sealing plate 13, and the filter cartridge 2 passes through the upper sealing plate 11, the outer cylinder body 12, and the lower sealing plate successively. Plate 13 is provided.

Please continue to refer to Fig. 1 and Fig. 3, the filter cartridge 2 includes a filter cartridge body 22, an upper cover plate 21 and a lower cover plate 23, the upper cover plate 21 and the lower cover plate 23 are respectively fixed on the top and the bottom of the filter cartridge body 22, and the lower cover plate 22 is The cover plate 23 can be fixed on the lower cover plate 13 . The water outlet 230 of the filter cartridge is set on the lower cover plate 23, the water inlet 121 of the outer cylinder is arranged on the upper end of the outer cylinder 1, the flow direction of the water to be filtered rotates from top to bottom, and when the water outlet 230 of the filter cartridge is arranged at the bottom end, use Under the action of gravity of the water, the filtered water can flow out of the filter under the action of gravity. The filter cylinder 22 is made of hard material to withstand the impact of water flow, and the filter cylinder 22 is provided with meshes or gaps. The size of the meshes or gaps is selected according to the filtering requirements. The number and distribution of the meshes or gaps are here Not limited. Of course, in other embodiments, the filter cylinder 22 can also be a porous material. The lower end of the water axis tube 3 extends into the filter cartridge 2, the upper end of the water axis tube 3 is connected to the driving structure 5, and the recoil water inlet 31 is also arranged at the upper end of the water axis tube 3, and the recoil water flow moves from top to bottom, making full use of The gravity effect realizes the comprehensive cleaning of the filter cartridge 2.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims (10)

1. The recoil type self-cleaning filter is characterized in that: including The outer cylinder has an outer cylinder water inlet for the water to be filtered, and a sewage outlet for discharging impurities; The water inlet pipe of the outer cylinder is connected to the water inlet of the outer cylinder, and the direction of the water flow in the end of the water inlet pipe of the outer cylinder close to the outer cylinder is tangent to the rotation direction of the water flow in the outer cylinder; A filter cartridge is used for filtering water, the filter cartridge is arranged inside the outer cylinder, and the filter cartridge has a filter cartridge water outlet for clear water to flow out; A water axis tube, which is installed in the filter cartridge, the water axis tube has a recoil water inlet for inputting clean water, and the water axis tube is provided with a water outlet structure connected thereto; and The driving structure is connected with the water axis tube and is used to drive the water axis tube to rotate. 2. The recoil self-cleaning filter according to claim 1, characterized in that: the water outlet structure includes a plurality of nozzles fixed on the outer wall of the water axis tube, and the nozzles are connected to the water axis tube Pass. 3. The recoil type self-cleaning filter according to claim 2, characterized in that: the water outlet structure further comprises a connecting pipe connecting the water axis pipe and the nozzle. 4. The recoil type self-cleaning filter according to claim 2, characterized in that: the nozzle is conical, and the conical bottom of the nozzle is arranged towards the filter cartridge. 5. The recoil type self-cleaning filter according to any one of claims 1-4, characterized in that: the outlet of the filter cartridge communicates with the inlet of the recoil, and the outlet of the filter cartridge communicates with the inlet of the recoil. A recoil water pump is arranged between the recoil water inlets. 6. The recoil type self-cleaning filter according to any one of claims 1-4, characterized in that: a pressure sensor for testing water pressure is provided in the filter cartridge, and the pressure sensor and the driving structure electrical connection. 7. The recoil type self-cleaning filter according to any one of claims 1-4, characterized in that: the water inlet of the outer cylinder and the sewage outlet are respectively arranged on the axial direction of the outer cylinder opposite sides of the . 8. The recoil type self-cleaning filter according to any one of claims 1-4, characterized in that: a sewage discharge pipe is connected to the sewage discharge outlet, and a sewage discharge valve is arranged on the sewage discharge pipe. 9. The recoil type self-cleaning filter according to any one of claims 1-4, characterized in that: the outer cylinder comprises an outer cylinder body, an upper sealing plate fixed on the top of the outer cylinder body, and a fixed The lower sealing plate at the bottom of the outer cylinder body, the water inlet of the outer cylinder is opened on the outer cylinder body, the sewage outlet is opened on the lower sealing plate, and the filter cartridge passes through the upper sealing plate in turn plate, the outer cylinder body, and the lower sealing plate are set. 10. The backflushing self-cleaning filter according to any one of claims 1-4, characterized in that: the filter cartridge comprises a filter cylinder body, an upper cover plate fixed on the top of the filter cylinder body, and a fixed On the lower cover plate at the bottom of the filter cylinder, the water outlet of the filter cylinder is opened on the lower cover plate.