Swimming pool dirt suction device with double-layer filtering structure

Abstract

The swimming pool sewage suction device with the double-layer filtering structure comprises a shell, a power assembly used for providing negative pressure is arranged in the shell, and the bottom of the shell is connected with a sewage suction assembly; the sewage suction assembly comprises a water pumping shell, a collecting shell fixedly arranged in the water pumping shell and a sewage suction head clamped to the bottom of the water pumping shell, the water pumping shell and the collecting shell are clamped to the bottom of the shell, a collecting cavity communicated with the sewage suction head is formed in the collecting shell, and a water passing cavity communicated with the collecting cavity is formed in the water pumping shell; a water drainage cavity communicated with the water passing cavity is formed in the shell, and a water drainage opening communicated with the water drainage cavity is formed in the periphery of the shell; a water drainage area communicated with the water passing cavity is formed on the periphery of the collecting shell, a plurality of water drainage holes are formed in the water drainage area, and the water drainage area is covered with a filter screen assembly.

Description

Technical Field

[0001] The invention relates to the technical field of swimming pool cleaning equipment, and in particular to a swimming pool sewage suction device with a double-layer filtering structure. Background Art

[0002] As people's material living standards gradually improve, more and more people begin to pay attention to sports, and swimming is a fitness and entertainment activity that many people like. It not only enhances people's overall physical fitness but also enriches the content of life. As people's material living standards gradually improve, more and more home swimming pools appear in people's courtyards, and the hygiene of the swimming pool is greatly related to the health of swimmers. Regular cleaning of the swimming pool is undoubtedly an important thing.

[0003] For example, a swimming pool cleaner disclosed in publication number "CN217975615U" includes a cleaner housing, in which a pump chamber and a motor chamber are arranged; the pump chamber is a channel for sucking sewage; a power supply assembly and a drive motor are arranged in the motor chamber, the drive motor is connected to an impeller, the impeller is located in the pump chamber, the drive motor is connected to the power supply assembly, and the cleaner is started by controlling the switch of the power supply assembly.

[0004] However, at present, this type of swimming pool vacuum cleaner can only filter large volumes of garbage when in use, and is unable to perform secondary filtration on fine garbage such as mud, sand, and algae. As a result, the fine garbage such as mud, sand, and algae will be discharged with the water flow and return to the swimming pool, thereby greatly reducing the cleaning effect. Summary of the invention

[0005] In order to solve the technical problems existing in the background technology, the present invention proposes a swimming pool sewage suction device with a double-layer filtering structure.

[0006] The technical solution adopted by the present invention to solve the technical problem is as follows:

[0007] A swimming pool sewage suction device with a double-layer filtering structure comprises a shell, a power component for providing negative pressure is arranged inside the shell, and a sewage suction component is connected to the bottom of the shell;

[0008] The sewage suction assembly includes a water pumping shell, a collecting shell fixed in the water pumping shell, and a sewage suction head clamped at the bottom of the water pumping shell. The water pumping shell and the collecting shell are clamped at the bottom of the shell. A collecting cavity connected to the sewage suction head is formed in the collecting shell. A water passage cavity connected to the collecting cavity is formed in the water pumping shell. A drainage cavity connected to the water passage cavity is formed in the shell. The outer periphery of the shell constitutes a drainage port connected to the drainage cavity.

[0009] A drainage area connected to the water cavity is formed on the outer periphery of the collecting shell, a plurality of drainage holes are formed on the drainage area, and a filter screen assembly is provided on the upper cover of the drainage area.

[0010] Preferably, a filtering space for filtering fine garbage is defined between the filter screen assembly and the drainage area, and the end of the collection chamber close to the drainage hole is closed, and the water flow is limited to pass through the drainage area and the filtering space in sequence. Through the above improvements, water moves vertically upward under the action of the power assembly, enters the collection chamber, moves toward the drainage area on the side, passes through the drainage hole on the drainage area for the first time, and passes through the filtering space for the second time, and finally enters the water passage chamber, ensuring the filtering effect.

[0011] Preferably, the outer periphery of the water pumping shell is formed with a first snap-in convex portion, the outer periphery of the shell is formed with a first snap-in groove for the first snap-in convex portion to be placed in, and the bottom of the shell is provided with a snap-in seat, the outer periphery of the snap-in seat is formed with a second snap-in convex portion, and the outer periphery of the collecting shell is formed with a second snap-in groove for the second snap-in convex portion to be placed in. Through the above improvements, during the installation of the sewage suction assembly, the sewage suction head is first snap-in connected with the water pumping shell, and the collecting shell is inserted into the water pumping shell, and the first snap-in convex is matched with the first snap-in convex portion to connect the water pumping shell with the shell, and the second snap-in convex is matched with the second snap-in groove to connect the collecting shell with the shell, thereby realizing the quick connection between the sewage suction assembly and the shell, and improving the convenience of the user during the assembly process.

[0012] Preferably, one end of the collection shell is inserted and fixed on the water pumping shell, and the other end is engaged with the engaging seat, the first engaging groove and the second engaging groove include an insertion section arranged vertically, and an engaging section arranged horizontally, and when the first engaging protrusion slides to the insertion section, the second engaging protrusion is inserted into the insertion section, and when the first engaging protrusion rotates to the engaging section, the second engaging protrusion is inserted into the engaging section. Through the above improvements, during the connection process between the collection shell and the water pumping shell and the shell, the first engaging protrusion and the second engaging protrusion will synchronously enter the insertion section, and as the collection shell and the water pumping shell rotate, the first engaging protrusion and the second engaging protrusion will synchronously enter the engaging section, thereby realizing the synchronous engaging of the collection shell and the water pumping shell with the shell, greatly improving the convenience of installation.

[0013] Preferably, the outer periphery of the collection shell forms an outwardly convex mounting portion, and a mounting groove is formed on the mounting portion, the drainage area is formed in the mounting groove, and the filter assembly includes a filter bracket and filter cotton arranged on the filter bracket, and the filter bracket is installed in the mounting groove. Through the above improvements, the collection shell uses the drainage hole to perform the first filtration on some large-volume garbage, and uses the filter cotton to perform the second filtration on the water discharged from the drainage hole, and performs the second filtration on fine garbage such as silt and algae, and the filter bracket cooperates with the mounting groove to ensure the convenience and reliability of the installation of the filter assembly.

[0014] Preferably, a water guiding arc surface is formed between the mounting parts. Through the above improvement, the water guiding arc surface is used to guide the filtered water, so that the water enters the drainage cavity from the water passage cavity under the action of the power component and is discharged through the drainage port, thereby improving the drainage effect.

[0015] Preferably, the outer periphery of the clamping seat is formed with a plurality of water grooves connected to the water cavity, and the bottom of the shell is formed with a water outlet connected to the water groove. Through the above improvements, during the water filtering process, after the water passes through the collection shell and the filter screen assembly, under the action of the power assembly, the water flows from the water cavity into the clamping seat, and flows into the drainage cavity through the water grooves on the clamping seat, thereby achieving water discharge.

[0016] Preferably, a connecting pipe is formed in the water pumping shell, the input end of the connecting pipe is clamped with the sewage suction head, and the output end of the connecting pipe is connected to the collection shell. Through the above improvement, the input end of the connecting pipe is clamped with the sewage suction head, and the output end of the connecting pipe is connected to the collection shell, so that water can enter through the sewage suction head and enter the collection shell along the connecting pipe for filtration.

[0017] Preferably, the collection shell has an inlet pipe connected to the connecting pipe, a connecting sealing sleeve is sleeved on the input end of the inlet pipe, the connecting sealing sleeve fits the outer contour of the connecting pipe, and a non-rotating plate is rotated on the output end of the inlet pipe. Through the above improvements, the sealing performance during the water inlet process is improved, and sewage is prevented from being directly discharged into the water passage cavity through the gap between the inlet pipe and the connecting pipe, thereby ensuring the filtering effect.

[0018] Preferably, a quick drainage groove for drainage is formed on the pumping shell, a stopper for drainage or water blocking is arranged on the quick drainage groove, and a rotation-stopping protrusion is arranged in the quick drainage groove, and the rotation-stopping protrusion abuts against the stopper to limit the rotation of the stopper. Through the above improvements, when the sewage suction device leaves the water surface, the stopper will lack the effect of water pressure and will rotate, so that the water in the water passage cavity can be discharged from the quick drainage groove, thereby quickly emptying the water inside the pumping shell, and the rotation-stopping protrusion will limit the stopper to prevent the stopper from rotating too much and affecting its service life.

[0019] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0020] A power component is arranged in the shell, and a sewage suction component is connected to the bottom of the shell, wherein the sewage suction component includes a water pumping shell, a collecting shell fixed in the water pumping shell, and a sewage suction head clamped at the bottom of the water pumping shell, the water pumping shell and the collecting shell are clamped at the bottom of the shell, a collecting chamber connected to the sewage suction head is formed in the collecting shell, a water flow chamber connected to the collecting chamber is formed in the water pumping shell, a drainage chamber connected to the water flow chamber is formed in the shell, and a drainage port connected to the drainage chamber is formed on the outer periphery of the shell. During use, the power component will work and provide negative pressure to allow sewage to enter the collecting shell from the sewage suction head. After being filtered by the collecting shell, the water enters the water flow chamber, then moves to the drainage chamber, and finally is discharged to the outside of the shell through the drainage port, and a drainage area connected to the water flow chamber is formed on the outer periphery of the collecting shell, and a plurality of drainage holes are formed on the drainage area. The drainage holes can block large volumes of garbage for one filtration, and a filter mesh assembly is provided on the upper cover of the drainage area. The filter mesh assembly can filter small volumes of garbage such as mud and sand, thereby greatly improving the filtering effect to enhance the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is a structural schematic diagram of another angle of the overall structure of the present invention;

[0023] Figure 3 A cross-sectional view of the overall structure of the present invention;

[0024] Figure 4 It is a schematic diagram of the structure of the pumping shell and the filter screen assembly of the present invention;

[0025] Figure 5 It is a schematic structural diagram of the pumping shell of the present invention;

[0026] Figure 6 It is a schematic diagram of the structure inside the pumping shell of the present invention;

[0027] Figure 7 It is a structural schematic diagram of the bottom of the pumping shell of the present invention;

[0028] Figure 8 It is a structural schematic diagram of the bottom of the housing of the present invention;

[0029] Fig. 9 It is a schematic diagram of the structure inside the housing of the present invention;

[0030] Fig.10 is a schematic diagram of the waterway inside the shell of the present invention;

[0031] Fig.11 It is a structural schematic diagram of the cooperation between the clamping seat and the filter element of the present invention;

[0032] In the figure: 1, housing; 2, power assembly; 3, sewage suction assembly; 4, filter assembly; 1.1, water pumping shell; 1.2, collection shell; 1.3, sewage suction head; 1.4, collection chamber; 1.5, water passage chamber; 1.6, drainage chamber; 1.7, drainage port; 1.8, drainage area; 1.9, drainage hole; 2.1, first clamping protrusion; 2.2, first clamping groove; 2.3, clamping seat; 2.4, second clamping protrusion; 2.4, second clamping groove; 2.5, insertion section; 2.6, clamping section ;3.1, installation part;3.2, installation groove;3.3, filter bracket;3.4, filter cotton;3.5, water guide arc surface;3.6, water groove;3.7, water outlet;4.1, connecting pipe;4.2, water inlet pipe;4.3, connecting sealing sleeve;4.4, non-rotating plate;5.1, fast drain groove;5.2, stop plate;5.3, non-rotating convex part;5.4, card interface;5.5, card buckle;6.1, driving motor;6.2, impeller;6.3, power supply unit;7.1, filter element; DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] It should be understood that although the terms upper, middle, lower, top, end, etc. appear in this article to describe various elements, these elements are not limited by these terms. These terms are only used to distinguish elements from each other for easy understanding, and are not used to define any direction or order limitation.

[0035] like Figure 1-11 As shown, the swimming pool sewage suction device with a double-layer filtering structure includes a shell 1, a power component 2 for providing negative pressure is arranged inside the shell 1, and a sewage suction component 3 is connected to the bottom of the shell 1.

[0036] Specifically, the sewage suction component 3 includes a water pumping shell 1.1, a collecting shell 1.2 fixed in the water pumping shell 1.1, and a sewage suction head 1.3 clamped at the bottom of the water pumping shell 1.1. The water pumping shell 1.1 and the collecting shell 1.2 are clamped at the bottom of the shell 1. A collecting chamber 1.4 connected to the sewage suction head 1.3 is formed in the collecting shell 1.2, a water passage chamber 1.5 connected to the collecting chamber 1.4 is formed in the water pumping shell 1.1, a drainage chamber 1.6 connected to the water passage chamber 1.5 is formed in the shell 1, and a drainage outlet 1.7 connected to the drainage chamber 1.6 is formed on the outer periphery of the shell 1.

[0037] Furthermore, a drainage area 1.8 connected to the water cavity 1.5 is formed on the outer periphery of the collecting shell 1.2, a plurality of drainage holes 1.9 are formed on the drainage area 1.8, and a filter screen assembly 4 is provided on the drainage area 1.8.

[0038] During the use of the swimming pool sewage suction device, the power component 2 will work and provide negative pressure, so that the sewage enters the collection shell 1.2 from the suction head 1.3. After being filtered by the collection shell 1.2, the water enters the water chamber 1.5, then moves to the drainage chamber 1.6, and finally is discharged to the outside of the shell 1 through the drain port 1.7. A drainage area 1.8 connected to the water chamber 1.5 is formed on the outer periphery of the collection shell 1.2. A plurality of drainage holes 1.9 are formed on the drainage area 1.8. The drainage holes 1.9 can block large volumes of garbage for one filtration. The drainage area 1.8 is covered with a filter mesh assembly 4, which can filter small volumes of garbage such as mud and sand, thereby greatly improving the filtering effect to enhance the user experience.

[0039] like Figures 3 to 5 As shown, as a further explanation of sewage filtration, a filtering space for filtering fine garbage is defined between the filter mesh assembly 4 and the drainage area 1.8, and the end of the collecting chamber 1.4 close to the drainage outlet 1.7 is closed, and the water flow is limited to pass through the drainage area 1.8 and the filtering space in sequence.

[0040] During the sewage suction process, water flows vertically upward under the action of the power component 2, enters the collection chamber 1.4, and then moves toward the drainage area 1.8 set on the side of the collection chamber 1.4. After the first filtration through the drainage holes 1.9 on the drainage area 1.8 and the second filtration through the filter space, the water finally enters the water passage chamber, thereby ensuring the filtering effect.

[0041] As a further explanation of the connection and cooperation between the water pumping shell 1.1 and the collecting shell 1.2 and the shell body 1, a first snap-fitting protrusion 2.1 is formed on the outer periphery of the water pumping shell 1.1, a first snap-fitting groove 2.2 is formed on the outer periphery of the shell body 1 for the first snap-fitting protrusion 2.1 to be inserted into, and a snap-fitting seat 2.3 is provided at the bottom of the shell body 1, a second snap-fitting protrusion 2.4 is formed on the outer periphery of the snap-fitting seat 2.3, and a second snap-fitting groove 2.4 is formed on the outer periphery of the collecting shell 1.2 for the second snap-fitting protrusion 2.4 to be inserted into.

[0042] During the installation of the sewage suction component 3, the sewage suction head 1.3 is first snap-fitted with the water suction shell 1.1, and the collecting shell 1.2 is inserted into the water suction shell 1.1, and the first snap-fitting protrusion 2.1 cooperates with the first snap-fitting protrusion 2.1 to connect the water suction shell 1.1 with the shell 1, and the second snap-fitting protrusion 2.4 cooperates with the second snap-fitting groove 2.4 to connect the collecting shell 1.2 with the shell 1, thereby realizing the quick connection of the sewage suction component 3 with the shell 1 and improving the convenience of users during the assembly process.

[0043] Furthermore, one end of the collecting shell 1.2 is plugged and fixed on the water pumping shell 1.1, and the other end is clipped with the clip seat 2.3. The first clip groove 2.2 and the second clip groove 2.4 include a vertically arranged insertion section 2.5 and a horizontally arranged clip section 2.6. When the first clip protrusion 2.1 slides to the insertion section 2.5, the second clip protrusion 2.4 is inserted into the insertion section 2.5. When the first clip protrusion 2.1 rotates to the clip section 2.6, the second clip protrusion 2.4 is inserted into the clip section 2.6.

[0044] During the connection process of the collecting shell 1.2 and the water pumping shell 1.1 with the shell body 1, the first clamping protrusion 2.1 and the second clamping protrusion 2.4 will synchronously enter the insertion section 2.5, and as the collecting shell 1.2 and the water pumping shell 1.1 rotate, the first clamping protrusion 2.1 and the second clamping protrusion 2.4 will synchronously enter the clamping section 2.6, thereby realizing the synchronous clamping of the collecting shell 1.2 and the water pumping shell 1.1 with the shell body 1, greatly improving the convenience of installation.

[0045] like Figure 4 , Figure 5 As shown, as a further explanation of the installation of the filter assembly 4 in this embodiment, the outer periphery of the collecting shell 1.2 forms an outwardly protruding mounting portion 3.1, and a mounting groove 3.2 is formed on the mounting portion 3.1, the drainage area 1.8 is formed in the mounting groove 3.2, the filter assembly 4 includes a filter bracket 3.3, and filter cotton 3.4 arranged on the filter bracket 3.3, and the filter bracket 3.3 is installed in the mounting groove 3.2.

[0046] During the use of the swimming pool sewage vacuum cleaner, the collection shell 1.2 uses the drainage hole 1.9 to perform the first filter on some large-volume garbage, and uses the filter cotton 3.4 to perform the second filter on the water discharged from the drainage hole 1.9, and performs the second filter on fine garbage such as mud, algae, etc., and the filter bracket 3.3 cooperates with the installation groove 3.2 to ensure the convenience and reliability of the installation of the filter net assembly 4.

[0047] In addition, a water guiding arc surface 3.5 is formed between the mounting parts 3.1, and the water guiding arc surface 3.5 is used to guide the filtered water, so that the water enters the drainage cavity 1.6 from the water passage cavity 1.5 under the action of the power component 2, and is discharged through the drainage port 1.7, thereby improving the drainage effect.

[0048] In some other embodiments, the drainage holes 1.9 are arranged at intervals along the outer contour of the collecting shell 1.2, and the filter screen assembly 4 is arranged around the outer periphery of the collecting shell 1.2, which not only greatly increases the filtering area and improves the filtering speed, but also ensures that the water discharged from the periphery is filtered twice, greatly improving the filtering effect.

[0049] As a further explanation of the water circuit of the swimming pool sewage vacuum cleaner, the power component 2 includes a driving motor 6.1 arranged in the shell 1, an impeller 6.2 at the output end of the driving motor 6.1, and a power supply unit 6.3 for supplying power to the driving motor 6.1. The driving motor 6.1 drives the impeller 6.2 to rotate, thereby sucking water in the water passage chamber 1.5 into the drainage chamber 1.6 and then discharging it from the drainage port 1.7.

[0050] Furthermore, a plurality of water grooves 3.6 connected to the water cavity 1.5 are formed on the outer periphery of the clamping seat 2.3, and a water outlet 3.7 connected to the water grooves 3.6 is formed on the bottom of the housing 1.

[0051] like Fig.11 As shown, as a preference, a filter element is provided in the water tank 3.6, and the filter element is used to perform a third filtration on the water that has undergone the second filtration, thereby further improving the filtration effect.

[0052] During the water filtering process, sewage enters the collecting chamber 1.4 from the sewage suction head 1.3. After the water is filtered twice by the collecting shell 1.2 and the filter screen assembly 4, under the action of the power assembly 2, the water flows from the water passage chamber 1.5 into the clamping seat 2.3, and flows into the water passage port 3.7 through the water passage groove 3.6 on the clamping seat 2.3, and enters the drainage chamber 1.6, thereby realizing the discharge of water.

[0053] In addition, during the entire water flow process, water first enters the collection chamber vertically upward, then enters the water passage chamber through the laterally arranged drainage area, then vertically upward for a certain distance and laterally enters the water passage trough 3.6, then continues to move vertically upward through the water passage 3.7 into the drainage chamber 1.6, and finally is discharged from the drainage port 1.7 on the outer periphery of the shell 1, which is conducive to retaining garbage through the curved flow channel.

[0054] like Figures 1 to 3 As shown, further explanation of the connection between the sewage suction components 3 is provided, a connecting pipe 4.1 is formed in the water pumping shell 1.1, the input end of the connecting pipe 4.1 is clamped with the sewage suction head 1.3, and the output end of the connecting pipe 4.1 is connected to the collecting shell 1.2, by clamping the input end of the connecting pipe 4.1 with the sewage suction head 1.3, and the output end of the connecting pipe 4.1 is connected to the collecting shell 1.2, so that water can enter through the sewage suction head 1.3 and enter the collecting shell 1.2 along the connecting pipe 4.1 for filtration.

[0055] A card interface 5.4 is formed on the sewage suction head 1.3, and a card buckle 5.5 is formed on the collection shell 1.2. The card buckle 5.5 cooperates with the card interface 5.4 to achieve quick connection and disassembly of the sewage suction head 1.3 and the collection shell 1.2.

[0056] Furthermore, the collecting shell 1.2 has an inlet pipe 4.2 connected to the connecting pipe 4.1, a connecting sealing sleeve 4.3 is sleeved on the input end of the inlet pipe 4.2, the connecting sealing sleeve 4.3 fits the outer contour of the connecting pipe 4.1, and a non-return plate 4.4 is rotated on the output end of the inlet pipe 4.2.

[0057] The connection sealing sleeve 4.3 cooperates with the connection pipe 4.1 to improve the sealing performance during water inlet, and prevents sewage from being directly discharged into the water passage cavity 1.5 through the gap between the water inlet pipe 4.2 and the connection pipe 4.1, thereby ensuring the filtering effect.

[0058] In addition, the anti-rotation plate 4.4 can limit the backflow of sewage and prevent the water entering the collection chamber 1.4 from flowing back to affect the cleaning effect.

[0059] like Figure 3 As shown, in some other embodiments, a quick drainage groove 5.1 for drainage is formed on the water pumping shell 1.1, and a stopper 5.2 for drainage or water blocking is rotated on the quick drainage groove 5.1. When the sewage suction device is out of the water surface, the stopper 5.2 lacks the effect of water pressure and rotates, so that the water in the water chamber 1.5 can be discharged from the quick drainage groove 5.1, thereby quickly emptying the water inside the water pumping shell 1.1.

[0060] In addition, a stopper protrusion 5.3 is provided in the quick drainage groove 5.1. When the stopper piece 5.2 rotates to a certain angle, the stopper protrusion 5.3 will limit the stopper piece 5.2 to prevent the stopper piece 5.2 from rotating too much and affecting its service life.

[0061] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A swimming pool cleaner with a double-layer filtering structure, characterized in that: It comprises a shell (1), wherein a power component (2) for providing negative pressure is arranged inside the shell (1), and a sewage suction component (3) is connected to the bottom of the shell (1); The sewage suction assembly (3) comprises a water pumping shell (1.1), a collecting shell (1.2) fixed in the water pumping shell (1.1), and a sewage suction head (1.3) clamped at the bottom of the water pumping shell (1.1); the water pumping shell (1.1) and the collecting shell (1.2) are clamped at the bottom of the shell (1); a collecting chamber (1.4) connected to the sewage suction head (1.3) is formed in the collecting shell (1.2); a water passage chamber (1.5) connected to the collecting chamber (1.4) is formed in the water pumping shell (1.1); a drainage chamber (1.6) connected to the water passage chamber (1.5) is formed in the shell (1); and a drainage port (1.7) connected to the drainage chamber (1.6) is formed on the outer periphery of the shell (1); The outer periphery of the collecting shell (1.2) is formed with a drainage area (1.8) connected to the water cavity (1.5), a plurality of drainage holes (1.9) are formed on the drainage area (1.8), and a filter screen assembly (4) is provided on the upper cover of the drainage area (1.8).

2. The swimming pool sewage suction device with a double-layer filtering structure according to claim 1 is characterized in that: A filtering space for filtering fine garbage is defined between the filter screen assembly (4) and the drainage area (1.8), and the end of the collection chamber (1.4) close to the drainage hole (1.9) is closed, and the water flow is limited to pass through the drainage area (1.8) and the filtering space in sequence.

3. The swimming pool sewage suction device with a double-layer filtering structure according to claim 1 is characterized in that: The pumping shell (1.1) is formed with a first snap-fitting protrusion (2.1) on its outer periphery, the shell (1) is formed with a first snap-fitting groove (2.2) for the first snap-fitting protrusion (2.1) to be inserted into, and a snap-fitting seat (2.3) is provided at the bottom of the shell (1), the snap-fitting seat (2.3) is formed with a second snap-fitting protrusion (2.4) on its outer periphery, and the collecting shell (1.2) is formed with a second snap-fitting groove (2.4) for the second snap-fitting protrusion (2.4) to be inserted into.

4. The swimming pool sewage suction device with a double-layer filtering structure according to claim 3 is characterized in that: One end of the collecting shell (1.2) is plugged and fixed on the water pumping shell (1.1), and the other end is clamped with the clamping seat (2.3); the first clamping groove (2.2) and the second clamping groove (2.4) include a vertically arranged insertion section (2.5) and a horizontally arranged clamping section (2.6); when the first clamping protrusion (2.1) slides to the insertion section (2.5), the second clamping protrusion (2.4) is inserted into the insertion section (2.5); when the first clamping protrusion (2.1) rotates to the clamping section (2.6), the second clamping protrusion (2.4) is inserted into the clamping section (2.6).

5. The swimming pool sewage suction device with a double-layer filtering structure according to claim 1, characterized in that: The outer periphery of the collecting shell (1.2) forms an outwardly protruding mounting portion (3.1), and a mounting groove (3.2) is formed on the mounting portion (3.1); the drainage area (1.8) is formed in the mounting groove (3.2); the filter screen assembly (4) comprises a filter support (3.3) and filter cotton (3.4) arranged on the filter support (3.3); and the filter support (3.3) is installed in the mounting groove (3.2).

6. The swimming pool sewage suction device with a double-layer filtering structure according to claim 5, characterized in that: A water-conducting arc surface (3.5) is formed between the mounting parts (3.1).

7. The swimming pool sewage suction device with a double-layer filtering structure according to claim 4, characterized in that: A plurality of water channels (3.6) connected to and passing through the water cavity (1.5) are formed on the outer periphery of the clamping seat (2.3), and a water outlet (3.7) connected to and passing through the water channels (3.6) is formed on the bottom of the housing (1).

8. The swimming pool sewage suction device with a double-layer filtering structure according to claim 1, characterized in that: A connecting pipe (4.1) is formed in the water pumping shell (1.1), the input end of the connecting pipe (4.1) is clamped with the sewage suction head (1.3), and the output end of the connecting pipe (4.1) is connected to the collection shell (1.2).

9. The swimming pool sewage suction device with a double-layer filtering structure according to claim 7, characterized in that: The collecting shell (1.2) comprises a water inlet pipe (4.2) connected to the connecting pipe (4.1); a connecting sealing sleeve (4.3) is sleeved on the input end of the water inlet pipe (4.2); the connecting sealing sleeve (4.3) fits the outer contour of the connecting pipe (4.1); and a non-returning plate (4.4) is rotated on the output end of the water inlet pipe (4.2).

10. The swimming pool sewage suction device with a double-layer filtering structure according to claim 1, characterized in that: A quick drainage groove (5.1) for drainage is formed on the water pumping shell (1.1), a stopper sheet (5.2) for drainage or water blocking is arranged on the quick drainage groove (5.1), and a rotation-stopping protrusion (5.3) is arranged in the quick drainage groove (5.1), and the rotation-stopping protrusion (5.3) abuts against the stopper sheet (5.2) to limit the rotation of the stopper sheet (5.2).

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