Impeller assembly, pre-filter and water system

Abstract

The invention discloses an impeller assembly, a pre-filter applying the impeller assembly and a water consuming system, and relates to the technical field of pre-filters, the impeller assembly comprises an impeller body and a mounting seat, the impeller body is provided with a connecting part, and the connecting part is used for being in transmission connection with an outer framework of the pre-filter; the mounting seat is provided with an impeller cavity, the impeller body is rotatably mounted in the impeller cavity, and one axial side of the mounting seat is provided with a first water inlet communicated with the impeller cavity and the outside of the mounting seat; a second water inlet communicated with the impeller cavity and the outside of the mounting seat is formed in the peripheral side of the mounting seat; a water outlet communicated with the impeller cavity and the outside of the mounting seat is formed in the other axial side of the mounting seat; and the water outlet is used for being communicated with a drain outlet of the pre-filter. According to the technical scheme provided by the invention, the flushing efficiency and the drainage efficiency of the pre-filter can be improved; the water flow drives the outer framework to rotate, so that the self-cleaning capability and the filtering effect of the equipment are further improved.

Description

Technical Field

[0001] The invention relates to the technical field of pre-filters, and in particular to an impeller assembly, a pre-filter and a water use system. Background Art

[0002] Some pre-filters on the market usually have a flushing function, that is, they can be cleaned regularly to discharge the large particles that were previously intercepted, thereby increasing the service life of the pre-filter. Currently, most of them use direct flushing, which has a weak flushing effect and may cause sediment to block the sewage outlet during the drainage process. Summary of the invention

[0003] The main purpose of the present invention is to propose an impeller assembly and a pre-filter and a water system using the impeller assembly, which can, on the one hand, improve the flushing efficiency and drainage efficiency of the pre-filter and promote the discharge of impurities; on the other hand, it can also cooperate with the exoskeleton to drive the exoskeleton to rotate through water flow, thereby further improving the self-cleaning ability and filtering effect of the equipment.

[0004] To achieve the above-mentioned purpose, the present invention proposes an impeller assembly comprising an impeller body and a mounting seat, wherein the impeller body is provided with a connecting portion, and the connecting portion is used for transmission connection to the exoskeleton of the pre-filter; the mounting seat is provided with an impeller cavity, and the impeller body can be rotatably mounted in the impeller cavity, and one axial side of the mounting seat is provided with a first water inlet connecting the impeller cavity and the outside of the mounting seat; the circumferential side of the mounting seat is provided with a second water inlet connecting the impeller cavity and the outside of the mounting seat; the other axial side of the mounting seat is provided with a sewage outlet connecting the impeller cavity and the pre-filter.

[0005] In one embodiment, the first water inlet is inclined from the top of the mounting seat toward the bottom of the mounting seat along the same circumferential direction.

[0006] In one embodiment, the mounting seat is further provided with a water retaining ring for blocking water inflow, and a plurality of the first water inlets are provided, and the plurality of the first water inlets are all arranged in the water retaining ring, and the plurality of the first water inlets are all connected to the siphon flow channel of the pre-filter.

[0007] In one embodiment, a plurality of second water inlets with the same circumferential opening are provided at intervals on the circumferential side of the mounting seat; and the second water inlets are provided with a water guiding slope along the water inflow direction.

[0008] In one embodiment, a water inlet channel is further provided on the peripheral side of the mounting seat, the water inlet channel connects the second water inlet and the water filter cavity of the pre-filter, and the flow cross-section of the water inlet channel decreases in the direction away from the second water inlet.

[0009] In one embodiment, a plurality of the water outlets are provided, and the plurality of the water outlets surround the impeller body.

[0010] In one embodiment, the plurality of drain outlets are all arranged at an angle; and / or the plurality of drain outlets are the same in size and / or shape.

[0011] In one embodiment, the impeller body includes an impeller shaft and a plurality of blades obliquely arranged on the impeller shaft, and the water flows from the first water inlet and the second water inlet can cause the blades to drive the impeller shaft to rotate.

[0012] In one embodiment, the blade is tilted along the axial direction of the impeller shaft, and one end away from the impeller shaft is curved in the circumferential and axial directions to form a curved surface, and at least part of the blade corresponds to the first water inlet and the second water inlet.

[0013] In one embodiment, the end of the impeller shaft passes through the mounting seat, and the connecting portion is a plurality of protrusions provided on the upper end surface of the impeller shaft.

[0014] In one embodiment, the impeller body is hollow to form a avoidance hole, and passes through the mounting seat for the movable part of the pre-filter to pass through.

[0015] In one embodiment, the mounting seat includes a first shell and a second shell that are detachably connected, the second shell covers the first shell to form the impeller chamber, the first water inlet is arranged on the axial side of the first shell, and the second water inlet is arranged on the circumferential side of the first shell; the drain outlet is arranged in the second shell.

[0016] The present invention further provides a pre-filter comprising the impeller assembly as described above and an exoskeleton drivingly connected to the impeller assembly.

[0017] In one embodiment, the pre-filter also includes a valve head and a filter bottle connected to the valve head, and a water distributor arranged on the valve head and / or the filter bottle, the valve head has a water inlet, and the raw water entering the filter bottle from the water inlet passes through the water distributor to generate a vortex.

[0018] In one embodiment, the mounting seat is sealingly connected to the filter bottle.

[0019] In one embodiment, the pre-filter further comprises a filter assembly, and the exoskeleton is further provided with a scraping device for cleaning the filter assembly and / or the filter bottle.

[0020] In one embodiment, a water flow driving member is arranged on the inner periphery of the outer frame, and the water flow driving member can drive the outer frame to rotate under the drive of water flow.

[0021] In one embodiment, the pre-filter also includes a reversing structure for switching between a forward flushing mode and a back flushing mode, the reversing structure includes a reversing bottom shell and a movable part that can move relative to the reversing bottom shell, the movable part passes through the impeller assembly, and the reversing bottom shell is connected to the mounting seat.

[0022] In one embodiment, the pre-filter further includes a sewage discharge assembly, and the sewage discharge assembly is connected to the mounting seat.

[0023] The present invention also provides a water use system, comprising the pre-filter as described above.

[0024] The impeller assembly of the technical solution of the present invention can be arranged in the traditional pre-filter with only a filter assembly to enhance the flushing force and stirring effect of the water flow, improve the sewage discharge efficiency and cleanliness; it can also be combined with an exoskeleton / scraping device, and the impeller body is rotated to drive the scraping device to automatically clean the filter surface without additional energy consumption, which helps to reduce the overall operating cost and reduce water resource waste; in addition, the first water inlet and the second water inlet increase the water flow path and flow rate entering the impeller cavity, which can form a more complex flow pattern in the impeller cavity, providing sufficient power for the rotation of the impeller body. The design of the first water inlet and the second water inlet helps to form a more uniform and comprehensive water flow distribution, which is beneficial to improve the filtration efficiency, reduce the dead corners of the water flow, and ensure that the impurities in the water can be effectively filtered. When the drain valve is opened, water flows in through the first and second water inlets of the impeller assembly. The impeller body rotates under the impact of the water flow, which in turn drives the outer frame to rotate. This rotational motion can produce a vortex effect, causing the water flow to form a stronger agitation inside the filter bottle, thereby more effectively removing impurities and dirt attached to the surface of the filter medium. Compared with static water flow, the dynamic cleaning of the impeller assembly can significantly improve the efficiency and effect of flushing. In addition, the impeller assembly improves flushing efficiency and reduces water waste. The design of the impeller assembly helps to achieve a more environmentally friendly and energy-saving filtration system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0026] Figure 1 A schematic structural diagram of an embodiment of a pre-filter provided by the present invention;

[0027] Figure 2 for Figure 1 Schematic diagram of the structure after the pre-filter is disconnected from the middle part;

[0028] Figure 3 A schematic structural diagram of an impeller assembly according to an embodiment of the present invention;

[0029] Figure 4 A schematic structural diagram of another embodiment of an impeller assembly provided by the present invention;

[0030] Figure 5 It is a structural schematic diagram of an embodiment after the impeller body is removed;

[0031] Figure 6 for Figure 5 Exploded view in ;

[0032] Figure 7 It is a schematic cross-sectional structure diagram of an embodiment of an impeller assembly;

[0033] Figure 8 This is a schematic diagram of the structure of an embodiment after omitting the first housing;

[0034] Fig. 9 for Figure 8 The schematic diagram of the structure after the impeller body is omitted;

[0035] Fig.10 It is a structural schematic diagram of an embodiment of an impeller body;

[0036] Fig.11 This is an exploded view of the impeller assembly and the reversing bottom casing;

[0037] Fig.12 It is a cross-sectional structural schematic diagram of an embodiment of an impeller assembly and a reversing structure;

[0038] Fig.13 The figure is a schematic structural diagram of an embodiment of the cooperation between an impeller assembly, a reversing structure and an outer frame.

[0039] Description of Figure Numbers:

[0040] 10. filter bottle; 101. water filter chamber; 102. sewage outlet;

[0041] 20, valve head; 201, water inlet; 202, water outlet;

[0042] 30. Filter component;

[0043] 40. Impeller assembly;

[0044] 410, mounting seat; 401, impeller chamber; 402, first water inlet; 403, second water inlet; 404, drain outlet; 405, water inlet channel;

[0045] 420, first shell; 421, flange; 422, sealing groove; 424, water retaining ring;

[0046] 430, second shell; 435, water guide slope;

[0047] 440, impeller body; 441, impeller shaft; 442, blades; 443, connecting portion; 444, protrusion; 445, avoidance hole;

[0048] 50. Exoskeleton; 501. Siphon flow channel;

[0049] 60. Water distributor;

[0050] 70, reversing structure; 710, reversing bottom shell; 720, movable part; 730, suction cup;

[0051] 80. sewage discharge assembly; 810. connector; 820. sewage discharge valve; 830. connector module;

[0052] 90. Scraping and washing device.

[0053] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0054] 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.

[0055] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0056] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0057] Some pre-filters on the market usually have a flushing function, that is, they can be cleaned regularly to discharge the large particles that were previously intercepted, thereby increasing the service life of the pre-filter. Currently, most of them use direct flushing, which has a weak flushing effect and may cause sediment to block the sewage outlet during the drainage process.

[0058] To this end, the present invention proposes an impeller assembly, and a pre-filter and a water system using the impeller assembly. The impeller assembly can improve the flushing efficiency of the pre-filter, and can also improve the drainage efficiency of the pre-filter, thereby promoting the discharge of impurities.

[0059] Water use systems, such as whole-house water purification systems, are usually equipped with pre-filters, and use pre-filters to filter large particles from tap water, which not only ensures the safety of residents' water use, but also extends the service life of home appliances, prevents blockage of household water pipes, and improves the health of residents. The pre-filter is the first coarse filtration device in the whole-house water purification system. It is usually equipped with a stainless steel filter, which is a physical filtration device that is mainly used to intercept large particles larger than 40 microns to protect the safety of back-end water use.

[0060] See also Figure 1 and Figure 2 The pre-filter generally includes a valve head 20, a filter bottle 10, a filter assembly 30, and a Figure 3 and Figure 4In one embodiment of the present invention, the pre-filter includes a filter bottle 10 and a valve head 20 connected to the filter bottle 10, a filter assembly 30, an exoskeleton 50 and an impeller assembly 40. The filter bottle 10 has a water filter chamber 101, and the filter assembly 30 and the exoskeleton 50 are arranged in the water filter chamber 101, and the impeller assembly 40 is arranged below the exoskeleton 50. The valve head 20 has a water inlet 201 and a water outlet 202 connected to the water filter chamber 101, and the water inlet 201 is connected to the water supply end, and the water outlet 202 is connected to the water use end. It should be noted that the water supply end can be a tap, a water tower or well water, and the water use end can be a faucet, a shower or a drinking water outlet, and this application does not make specific restrictions on this.

[0061] A water distributor 60 is arranged in the valve head 20, and the water distributor 60 has a spiral flow channel. The raw water of the valve head 20 entering from the water inlet 201 forms a vortex after passing through the water distributor 60. The exoskeleton 50 is arranged with a water flow guide and can rotate relative to the filter assembly 30 driven by the water flow. The exoskeleton 50 is provided with a scraping device to clean the filter screen of the filter assembly 30; and impurities are adsorbed through the siphon flow channel 501 arranged in the exoskeleton 50. The rotation of the exoskeleton 50 generates a vortex, and the water flow of the exoskeleton 50 enters the impeller assembly 40. The exoskeleton 50 is connected to the impeller assembly 40 in a transmission manner. In the first stage, the exoskeleton 50 drives the impeller of the impeller assembly 40 to rotate; in the second stage, the impeller will in turn drive the exoskeleton 50 to rotate, so that the water in the filter bottle 10 generates a vortex and is discharged from the sewage outlet 102 of the filter bottle 10 more quickly.

[0062] A filter assembly 30 is installed inside the pre-filter. The form and structure of the filter assembly 30 are not limited. The filter assembly 30 can be a stainless steel filter or a PP cotton filter. When water flows through, these filters can intercept large particles of impurities in the water, remove some precipitated impurities, rust, sand, mud, bacteria and other particulate impurities generated in the pipeline, and provide better protection for water purifiers, washing machines, showers, high-end faucets, downstream pipelines, etc., reducing the risk of damage to these devices due to clogging by impurities.

[0063] The pre-filter is usually a "T"-shaped structure, with the upper "horizontal" position at the left and right ends being the water inlet and outlet 202 respectively, the lower "vertical" position being the body and the internal cylindrical filter assembly 30, and the bottom being the sewage outlet 102, which is controlled to open and close by a valve.

[0064] The valve head 20 is usually made of copper alloy, and the connection between the valve head 20 and the filter bottle 10 is mainly threaded connection. For example, the valve head 20 is provided with an external threaded tube, and the bottle mouth of the filter bottle 10 is provided with an internal thread threaded with the external threaded tube. In order to reduce the production difficulty of the pre-filter, reduce the inspection requirements of its assembly results, and reduce the material cost of the valve head 20. In this embodiment, the connection between the filter bottle 10 and the valve head 20 is locked by fasteners after splicing.

[0065] The impeller assembly 40 is arranged in the water filter chamber 101 and is located below the filter assembly 30; the impeller assembly 40 includes a mounting seat 410 and an impeller body 440 rotatably arranged in the impeller chamber 401 of the mounting seat 410; one axial side of the mounting seat 410 is provided with a first water inlet 402 connecting the impeller chamber 401 and the outside of the mounting seat 410; the circumferential side of the mounting seat 410 is provided with a second water inlet 403 connecting the impeller chamber 401 and the outside of the mounting seat 410; the other axial side of the mounting seat 410 is provided with a drain port 404 connecting the impeller chamber 401 and the outside of the mounting seat 410; the drain port 404 is used to communicate with the sewage outlet 102 of the pre-filter.

[0066] In the technical solution of the present invention, when the drain valve is opened, water flows into the filter bottle 10 through the two water inlets of the impeller assembly 40, and the impeller body 440 rotates under the impact of the water flow. This rotational motion can generate a vortex effect, so that the water flow forms a stronger agitation inside the filter bottle 10, thereby more effectively removing impurities and dirt attached to the surface of the filter medium. Compared with static water flow, the dynamic cleaning of the impeller assembly 40 can significantly improve the efficiency and effect of flushing. In addition, the rotational motion of the impeller can stir up the impurities and dirt inside the filter bottle 10, suspending them in the water, and discharge the filter bottle 10 with the water flow through the water outlet 202 and the drain valve, avoiding the re-deposition of impurities on the filter medium, and ensuring the thoroughness of the flushing process. In addition, the impeller assembly 40 can effectively prevent the clogging of the filter medium by enhancing the flushing effect, keep the water flow unobstructed, and maintain the filtering efficiency of the pre-filter. This is crucial to maintaining stable water pressure and clean water quality in home or commercial systems. In addition, the impeller assembly 40 improves flushing efficiency and reduces water waste. The design of the impeller assembly 40 helps to achieve a more environmentally friendly and energy-saving filtering system.

[0067] The impeller assembly 40 is arranged at the sewage outlet 102. The impeller assembly 40 generates centrifugal force by rotating, which can cause the water flowing out of the sewage outlet 102 to generate a vortex, thereby improving the drainage effect. It can also be combined with the exoskeleton 50, and the rotation of the exoskeleton 50 is driven by the water flow, and the exoskeleton 50 is combined with the scraping device 90. The scraper is driven by the rotation of the exoskeleton 50 and / or the impeller assembly 40 to automatically clean the surface of the filter screen, effectively remove impurities attached to the filter screen, and reduce the frequency and difficulty of manual cleaning.

[0068] The present invention improves the impeller assembly 40, and the impeller assembly 40 can be used alone in a traditional pre-filter. Most traditional pre-filters adopt a simple drain valve design, and the drain valve is opened to allow water to flush the surface of the filter assembly 30 to discharge some impurities. However, this method often has low drainage efficiency and is difficult to completely remove stubborn dirt inside the filter assembly 30, especially for small particles and adhesive impurities. The removal effect is not ideal. By setting the impeller assembly 40 in the drainage system and using the water flow power to drive the impeller to rotate, it can not only enhance the flushing force and stirring effect of the water flow, but also improve the drainage efficiency and cleanliness; at the same time, the design of the impeller assembly 40 can be relatively simple, low cost, and no additional energy consumption is required, which helps to reduce the overall operating cost and reduce the waste of water resources.

[0069] In addition, the impeller assembly 40 can also be combined with the scraping device 90, and the impeller rotation drives the scraping device 90 to automatically clean the filter surface, effectively remove impurities attached to the filter, and reduce the frequency and difficulty of manual cleaning. The scraping device 90 can also be arranged on the outer frame 50, and the outer frame 50 can rotate relative to the filter assembly 30 to drive the scraping device 90 to clean (the scraping device is fixed or drivably arranged (electrically driven or manually driven) on the outer frame 50); in order to improve the sewage discharge effect, the outer frame 50 can also be provided with a siphon flow channel 501.

[0070] The impeller assembly 40 of the technical solution of the present invention can be arranged in a traditional pre-filter with only a filter assembly 30, so as to enhance the flushing force and stirring effect of the water flow, and improve the sewage discharge efficiency and cleanliness; it can also be combined with a scraping and washing device, and the impeller rotation drives the scraper to automatically clean the filter surface without additional energy consumption, which helps to reduce overall operating costs and reduce water waste; in addition, the first water inlet 402 and the second water inlet 403 are used to increase the water flow path and flow rate entering the impeller chamber 401, and multiple water inlets are set, so that the water flow can form a more complex flow pattern in the impeller chamber 401, providing sufficient power for the rotation of the impeller body 440.

[0071] In this embodiment, refer to Figure 1 , Figure 2 and Fig.12 , Fig.13 An exoskeleton 50 is provided in the pre-filter. The specific structure of the exoskeleton 50 can be referred to the introduction below. The impeller body 440 is provided with a connecting portion 443. The exoskeleton 50 is provided with a mounting portion corresponding to the connecting portion 443. The exoskeleton 50 can rotate relative to the filter assembly 30. The connecting portion 443 of the impeller body 440 is transmission-connected to the exoskeleton 50. The rotation of the impeller body 440 can drive the rotation of the exoskeleton 50, thereby further enhancing the water flow stirring effect and improving the sewage discharge efficiency.

[0072] Combination Figure 7 and Fig.12The impeller chamber 401 is located inside the mounting seat 410 as a closed space for the impeller body 440 to rotate. After the water flows from the filter bottle 10 through the filter assembly 30, part of the water flow (i.e., the sewage to be discharged) enters the impeller chamber 401 through the first water inlet 402 and the second water inlet 403, interacts with the rotating impeller body 440, generates a rotational force and a stirring effect, and helps to flush out the impurities remaining in the filter assembly 30. When the water flows into the impeller chamber 401, it will impact the impeller body 440 and drive it to rotate. The rotating impeller body 440 not only enhances the rotational force and stirring effect of the water flow, but also guides the water flow to the sewage outlet 102 through its specific blade 442 design, thereby improving the sewage discharge efficiency and cleanliness. The drain outlet 404 is set at the bottom or side of the mounting seat 410 (usually connected to the sewage valve), and its main function is to discharge the wastewater treated by the impeller assembly 40 out of the pre-filter.

[0073] Reference Figures 3 to 7 In order to facilitate the assembly of the impeller assembly 40, the mounting seat 410 includes a first shell 420 and a second shell 430 that are detachably connected. The second shell 430 covers the first shell 420 to form an impeller chamber 401. The first water inlet 402 and the second water inlet 403 are provided in the first shell 420, and the drain port 404 is provided in the second shell 430. The mounting seat 410 is composed of a first shell 420 and a second shell 430, which are tightly combined by a detachable connection method (such as threaded connection, snap connection, bolt fixing, etc.) to form a sealed impeller chamber 401 together, making the maintenance, cleaning and replacement of the impeller assembly 40 more convenient. In order to ensure a stable connection and facilitate tool-free disassembly, the first shell 420 and the second shell 430 are snap-fitted and fixed. The first water inlet 402 and the second water inlet 403 provided in the first shell 420 are key channels for water to enter the impeller chamber 401. The positions and sizes of these water inlets are carefully designed to ensure that water can enter the impeller chamber 401 evenly and efficiently and interact effectively with the rotating impeller body 440.

[0074] The second housing 430 is responsible for covering the first housing 420 to form a closed impeller chamber 401. The drain port 404 arranged thereon is connected to the drain valve of the pre-filter and is a channel for the treated wastewater to be discharged. At the same time, the existence of the second housing 430 also enhances the overall structural strength of the mounting base 410, and improves its durability and reliability. If the impeller body 440 or a certain water inlet / drain port 404 component is damaged, the user can replace these components separately without replacing the entire mounting base 410, thereby reducing maintenance costs. This design also allows the user to adjust the position or number of the water inlet and drain port 404 according to actual needs to adapt to pre-filters of different models and specifications. When the impeller assembly 40 needs to be cleaned or replaced, the user only needs to simply disassemble the second housing 430 to easily access the impeller chamber 401 and the impeller body 440 without removing the entire pre-filter.

[0075] Reference Figure 6 In order to facilitate the assembly of the first shell 420 and the second shell 430 while ensuring the sealing of the impeller chamber 401, the second shell 430 is fixed to the first shell 420 by snapping, and the two are covered to form the impeller chamber 401.

[0076] When the second housing 430 needs to be fixed on the first housing 420, the user only needs to align the clamping portion of the second housing 430 with the clamping slot portion of the first housing 420, and gently rotate or press the second housing 430 so that the clamping portion can be smoothly clamped into the clamping slot portion. Once the clamping portion is completely inserted into the clamping slot portion and locked, the second housing 430 will be firmly fixed on the first housing 420, thereby forming a closed impeller chamber 401. Preventing water from leaking out of the impeller chamber 401 ensures the normal operation of the pre-filter. This design method does not require additional fasteners (such as bolts, nuts, etc.), reducing production costs and user maintenance costs.

[0077] Combination Figures 3 to 6In order to optimize the water flow distribution, a plurality of first water inlets 402 are provided, and the plurality of first water inlets 402 are inclined from the top of the first housing 420 to the bottom of the first housing 420 along the circumferential direction. The circumferential direction can be clockwise or counterclockwise. By providing a plurality of first water inlets 402 at the top of the first housing 420, the water flow path and flow rate entering the impeller chamber 401 can be significantly increased. The plurality of water inlets can distribute the water flow more evenly, and the design of the first water inlet 402 being inclined from the top to the bottom along the circumferential direction helps to guide the water flow to enter the impeller chamber 401 more smoothly. The inclined water inlet can utilize gravity and the power of the water flow itself to make the water flow turn more smoothly and accelerate to enter the impeller chamber 401. The inclined water inlet design can also enhance the rotational force and stirring effect of the water flow. When the water flow enters the impeller chamber 401 at a certain angle, it will produce a stronger interaction with the rotating impeller body 440, thereby improving the sewage discharge efficiency of the pre-filter impeller assembly 40.

[0078] Combination Figures 3 to 5 and Figure 7 Furthermore, in order to allow the water in the siphon channel of the outer frame 50 to be discharged from the impeller assembly 40, the first housing 420 is also provided with a water retaining ring 424 for blocking the inflow of water, and the first water inlet 402 is arranged in the water retaining ring 424, and the first water inlet 402 is used to connect the siphon flow channel 501 of the pre-filter. In this embodiment, the bottom of the outer frame 50 is provided with a ring edge facing the first housing 420, and the ring edge is sleeved with the water retaining ring 424 to form an interlocking structure. Under the joint action of the interlocking structure and the water retaining ring 424, the water flow path in the pre-filter is optimized. Under normal circumstances, the water in the filter bottle 10 is blocked outside the water retaining ring 424, while the water in the siphon channel can smoothly enter the first water inlet 402 through the gap of the interlocking structure, and flow through the impeller assembly 40 for sewage discharge. This design not only ensures the normal filtering function of the pre-filter, but also improves the sewage discharge efficiency and stability.

[0079] In other embodiments, the water retaining ring 424 faces and approaches or abuts against the bottom of the outer frame 50, and does not affect the rotation of the outer frame 50 and the impeller body 440. At the same time, the water flow of the siphon channel of the outer frame 50 can also enter the first water inlet 402 through the water retaining ring 424, driving the impeller body 440 to rotate. In this way, excessive water in the filter bottle 10 is prevented from directly flowing into the first water inlet 402, and the water flow path of the siphon channel is cleverly guided.

[0080] In order to facilitate the water flow in the water filter chamber 101 to smoothly enter the impeller assembly 40 after producing the vortex, a plurality of second water inlets 403 with the same circumferential opening are arranged at intervals on the circumferential side of the first shell 420; the second water inlet 403 is provided with a water guiding slope 435 along the water inflow direction; the circumferential side of the first shell 420 is also provided with a water inlet channel 405, which connects the second water inlet 403 and the water filter chamber 101 of the pre-filter, and the flow cross-section of the water inlet channel 405 decreases in the direction away from the second water inlet 403.

[0081] It should be noted that the flow cross section refers to the cross section of the water inlet channel 405 in the axial direction, which gradually decreases along the extending direction away from the second water inlet 403 .

[0082] Reference Fig.13 The bottom of the outer skeleton 50 and the top of the first shell 420 form an "I" cross-section in the axial direction, and the vertical of the I is a water retaining ring 424. Water in the space on the side of the I can enter the second water inlet 403 from the water inlet channel 405 between the first shell 420 and the cavity wall of the filter bottle 10. In this embodiment, the second water inlet 403 is provided with two circumferentially rotating extensions, and the flow cross-sections of the two water inlet channels 405 are reduced in the direction away from the second water inlet 403. In order to improve the driving effect on the impeller body 440 after water inlet, the second water inlet 403 is provided with a water guiding slope 435 along the water inflow direction, so that the water flow enters the impeller cavity 401 at a certain angle. The water guiding slope 435 can also increase the kinetic energy of the water flow to a certain extent, so that it can interact with the impeller assembly 40 more effectively after entering the impeller cavity 401, thereby improving the sewage discharge effect.

[0083] Combination Figures 3 to 5 In addition, the flow cross-section of the water inlet channel 405 decreases in the direction away from the second water inlet 403. This design can produce a Venturi effect, that is, when the water flow cross-section gradually decreases, the flow rate will increase and the pressure will decrease. Such a flow rate change helps to enhance the flushing force of the water flow, making it easier for impurities in the water filter chamber 101 to be brought into the impeller assembly 40 for sewage treatment.

[0084] Combination Figure 8 and Fig. 9 In one embodiment, one end of the impeller shaft 441 is inserted into the central hole of the second housing 430 and fixed by a suitable fastener (such as a nut, a retaining spring, etc.). At the same time, in order to ensure that the impeller body 440 can rotate smoothly, a lubricating member such as a bearing can be installed between the impeller shaft 441 and the second housing 430.

[0085] Combination Figure 8 and Fig. 9In order to improve the drainage efficiency, the drain port 404 is arranged on the second housing 430, and the drain port 404 is provided with a plurality of drain ports 404, and the plurality of drain ports 404 surround the impeller seat, and the plurality of drain ports 404 are arranged around the impeller seat, and such a layout helps to disperse the water discharged from the impeller assembly 40 more evenly to the outside of the pre-filter. When the impeller rotates and pushes the water flow, the water will flow along the circumference of the impeller seat and be discharged smoothly through these surrounding drain ports 404. This layout reduces the concentration and conflict of the water flow during the discharge process and improves the drainage efficiency. The plurality of drain ports 404 are all arranged at an angle; each drain port 404 is designed to be inclined, which means that their opening direction is not completely perpendicular to the surface of the second housing 430, but has a certain inclination angle. This inclined setting helps to guide the water flow to flow out of the drain port 404 more smoothly and reduce the resistance of the water flow at the outlet. The plurality of drain ports 404 are of the same size and / or shape. The plurality of drain ports 404 are designed to be the same in size and / or shape, and such a design is conducive to maintaining the consistency and interchangeability of the drain ports 404. Drain ports 404 of the same size can ensure that the drainage capacity of each drain port 404 is similar, thereby avoiding problems such as poor drainage or water flow concentration caused by uneven sizes of the drain ports 404. At the same time, drain ports 404 of the same shape are also easy to process and install, thereby improving production efficiency and product quality. Specifically, the bottom cover is designed with four elliptical water outlets, each distributed at 90 degrees.

[0086] In one embodiment, the other end of the impeller body 440 is rotatably mounted on the first housing 420 through a corresponding structure. In this embodiment, the end of the impeller body 440 passes through the first housing 420, and the impeller body 440 is hollow so that the movable member 720 of the reversing structure 70 can pass through it. The end of the impeller body 440 exposed to the first housing 420 is provided with a connecting portion 443 that is transmission-connected to the outer frame 50, so that the outer frame 50 can first drive the impeller body 440 to rotate, and then the impeller body 440 drives the outer frame 50 to rotate. The second housing 430 is hollow to form an avoidance hole 445, and the avoidance hole 446 is provided in the hollow of the second housing 430. The second housing 430 is provided with a guide shaft cylinder corresponding to the avoidance hole 445 and extending away from the impeller body 440. A suction cup 730 is provided at the end of the guide rod. A plurality of clamping rings are provided at the outer periphery of the second housing 430. The clamping rings are used for clamping the reversing bottom housing 710 of the pre-filter. A reversing cavity for accommodating and moving the suction cup 730 is formed between the reversing bottom housing 710 and the second housing 430. The suction cup 730 moves up and down along the axial direction under the action of the water flow.

[0087] When the drain valve is opened, water flows in through the two water inlets of the impeller assembly 40, and the impeller body 440 rotates under the impact of the water flow. In order to improve the drainage efficiency, the impeller assembly 40 is sealed and connected to the filter bottle 10.

[0088] Specifically, the mounting seat 410 is sealed and connected to the filter bottle 10; the first water inlet 402 and the second water inlet 403 are connected to the water filter chamber 101, and the drain port 404 is connected to the sewage outlet 102. Wastewater enters the impeller assembly 40 from the first water inlet 402 and the second water inlet 403, and is discharged from the filter bottle 10 from the sewage outlet 102 through the drain port 404.

[0089] When the drain valve is opened, water enters the impeller chamber 401 through the first water inlet 402 and the second water inlet 403 on the mounting seat 410. In the impeller chamber 401, the impact of the water flow causes the impeller body 440 to rotate, further pushing the water flow and generating centrifugal force. This centrifugal force helps to push the impurities and residues in the water to the edge of the impeller chamber 401 and gather together. Finally, the waste water containing impurities is discharged from the filter bottle 10 through the drain port 404 on the mounting seat 410, completing the water purification and sewage discharge process.

[0090] Common methods for flushing the pre-filter include the following: direct flushing mode and back flushing mode. In direct flushing mode, water flushes the intercepting surface of the filter assembly 30 along the flow direction of tap water, and the particulate impurities on the filter are flushed out with the water flow. Back flushing mode involves reverse water flow flushing. The tap water pressure penetrates from the inner wall to the outer wall of the filter, forming a high-flow water column, flushing and discharging the particulate impurities on the filter from the inside out.

[0091] The impeller assembly 40 can be used in both the direct flushing mode and the back flushing mode. The impeller assembly 40 can also be used in conjunction with the siphon mode. The siphon mode usually adds an exoskeleton 50 to the pre-filter. The exoskeleton 50 is provided with a siphon flow channel 501, and the suction force generated by the siphon principle is used to help remove impurities accumulated on the filter. The structural form of the exoskeleton 50 and the connection relationship with the impeller assembly 40 can be referred to the above description, and will not be repeated here.

[0092] Reference Figure 2 , and combined with Figure 6 and Figure 7 The sealed connection between the impeller assembly 40 and the filter bottle 10 ensures the airtightness of the system and avoids inconveniences such as water leakage during use. In this embodiment, a seal is provided between the base and the filter bottle 10, and different sides of the seal are respectively abutted against the mounting seat 410 and the filter bottle 10 to achieve sealing between the two. In this embodiment, the seal is configured as a sealing ring, the inner peripheral side of the sealing ring abuts against the mounting seat 410, and the outer peripheral side of the sealing ring abuts against the filter bottle 10. In other embodiments, the seal can also be a gasket, a sealing tape, a water seal, a sealant, a soft filler, etc.

[0093] In order to facilitate the installation of the sealing ring, a sealing groove 422 is provided on the circumference of the base, and the sealing ring is installed in the sealing groove 422. The sealing ring is made of rubber suitable for drinking water or hot water, such as natural rubber, silicone rubber, etc.

[0094] The first shell 420 is abutted and sealed with the cavity wall of the filter bottle 10 through the sealing ring in the sealing groove 422 on the flange 421 on the outer peripheral side, and in order to achieve a better abutting and sealing effect, the peripheral side surface of the flange 421 is adapted to the contour of the inner wall surface of the filter bottle 10. The first shell 420 is abutted and sealed with the cavity wall of the filter bottle 10 through the sealing ring in the sealing groove 422 on the flange 421 on the outer peripheral side, and in order to achieve a better abutting and sealing effect, the peripheral side surface of the flange 421 is adapted to the contour of the inner wall surface of the filter bottle 10. The contour of the cavity wall of the filter bottle 10 is an arc. In order to ensure a close fit and further improve the sealing effect, the contour of the flange 421 is adapted to the contour of the cavity wall of the filter bottle 10.

[0095] After the flange 421 and the cavity wall of the filter bottle 10 are sealed against the sealing ring, a water inlet channel is formed between the outer peripheral side of the first shell 420 and the cavity wall of the filter bottle 10, and the swirling water flow can enter the impeller cavity 401 from the second water inlet 403 through the water inlet channel.

[0096] The above generally introduces the structure of the impeller assembly 40; the following introduces the overall matching relationship between the impeller assembly 40 and the outer frame 50 based on the sealed connection between the impeller assembly 40 and the filter bottle 10.

[0097] Reference Figures 8 to 10 Specifically, the impeller body 440 includes an impeller shaft 441 and a plurality of blades 442 obliquely arranged on the impeller shaft 441. The water flow from the first water inlet 402 and the second water inlet 403 can cause the blades 442 to drive the impeller shaft 441 to rotate. In order to increase the contact area of ​​the impeller with the water flow and improve the driving effect of the impeller, the blades 442 are obliquely arranged along the axial direction of the impeller shaft 441, and the end away from the impeller shaft 441 is curved in the circumferential direction and the axial direction to form a curved surface, and at least part of the blades 442 corresponds to the first water inlet 402 and the second water inlet 403.

[0098] Combination Figure 1 , Figure 2 and Fig.13, a water flow driving member 502 is arranged on the inner circumference of the outer frame 50. When the pre-filter is filtering water normally, the water coming in from the valve head 20 forms a vortex through the upper water distributor 60 of the filter assembly 30, and the flushing water flow driving member 502 drives the outer frame 50 to rotate. At this time, the rotation of the outer frame 50 does not rely on the bottom impeller to drive, and the bottom impeller body 440 is not hydraulically flushed during normal filtering. In the sewage discharge state, the bottom impeller body 440 rotates by water flow flushing, driving the outer frame 50 to rotate together, so the outer frame 50 can rotate in both filtering and sewage discharge states. The bottom of the outer frame 50 is clamped with the impeller body 440, and the two sides of the first shell 420 have a second water inlet hole, and a sealing groove 422 is designed in the side ring for installing a sealing ring, and sealing with the filter bottle 10 body, to ensure that all water flows in through the first water inlet 402 and the second water inlet 403 of the impeller assembly 40 during sewage discharge, thereby improving the rotation efficiency of the impeller body 440. The second housing 430 is fixed to the reversing bottom housing 710 by means of a buckle, and the reversing bottom housing 710 is also fixed to the sewage discharge assembly 80 by means of a buckle.

[0099] The mounting portion at the bottom of the outer skeleton 50 is configured as a plurality of annular protrusions 444 (six in this embodiment, but may also be five, seven, eight, etc.), the annular protrusions 444 cooperate with the connecting portion 443 of the impeller body 440, the connecting portion 443 is also configured as a protrusion 444, and the protrusions 444 and the grooves spaced apart from the protrusions 444 are positioned and fixed to form a transmission structure, and the rotation of the impeller body 440 can drive the skeleton to rotate; similarly, the rotation of the outer skeleton 50 can drive the rotation of the impeller body 440.

[0100] A water retaining ring 424 is designed at the bottom of the outer frame 50, which cooperates with the water retaining ring 424 of the first shell 420 to prevent excessive water in the filter bottle 10 from flowing into the first water inlet 402 at the upper part of the first shell 420. A first discharge port of the siphon flow channel 501 is arranged in the water retaining ring 424 at the bottom of the outer frame 50. The first discharge port is arranged obliquely, and the water in the siphon flow channel can directly flow into the first water inlet 402 at the top of the first shell 420 from the first discharge port. The first water inlet 402 is also arranged obliquely, so that the water flow can more easily impact the blades, thereby rotating the impeller body 440.

[0101] The first shell 420 is designed with second water inlets 403 on two sides, and water in the filter bottle 10 other than the siphon flow channel 501 can enter from these two second water inlets 403 during sewage discharge. Four oblique first water inlets 402 are designed on the top of the first shell 420, and water flowing out of the siphon flow channel 501 enters the impeller chamber 401 through the first water inlet 402. A water retaining ring 424 is designed on the top of the first shell 420, which cooperates with the water retaining ring 424 of the outer frame 50 to prevent excessive water from the outside from flowing into the first water inlet 402 on the top of the first shell 420.

[0102] The first housing 420 is provided with a sealing groove 422 in an annular direction for installing a sealing ring and sealing the filter bottle 10. An opening structure is provided in the middle of the four first water inlets 402 at the top of the first housing 420, and the upper part of the impeller body 440 extends out of the avoidance hole 445. The end protrusion 444 of the impeller body 440 is fixed to the protrusion 444 structure at the bottom of the outer frame 50, and the two are connected in a transmission manner.

[0103] The impeller body 440 is composed of multiple blades 442 tiltedly arranged on the impeller shaft 441, and one side of the tilted blade 442 is bent into an arc surface, with part of the arc surface facing the first water inlet 402 and part of it facing the second water inlet 403. In this way, the blade 442 can rotate under the combined action of the water flow from the second side water inlet 403 and the first top water inlet 402.

[0104] In order to facilitate the installation and disassembly of the sewage pipe and to have a good fixing effect, the sewage assembly 80 includes a connector 81, a sewage valve 820 and a joint module 830 which are connected in sequence. The joint module 830 can be used for the sewage pipe to pass through. The sewage pipe is an external pipe body, such as a plastic pipe or a hose. The type of the sewage valve 820 is not limited, and it can be a gate valve, a ball valve, etc. The sewage pipe is fixed by the joint module 830, so that the sewage pipe can be quickly installed on the filter bottle 10, and the installation is more convenient and firm, the reliability is improved, and the maintenance and replacement are simple. When sewage needs to be discharged, the sewage valve 820 is opened, and the wastewater in the water filter chamber 101 flows into the sewage assembly 80 through the sewage outlet 102 and is discharged to the outside from the sewage pipe through the joint module 830. Close the sewage valve 820 to stop; use the pre-filter normally for filtering.

[0105] The connector module 830 is used in the pre-filter. Compared with the existing solution of fastening the pipe body to the drain valve 820, the installation and replacement of the drain pipe are cumbersome. The connector module 830 has a snap-on or loosening mechanism, which makes the installation and removal of the drain pipe more convenient and quick, without the need for special tools, reducing maintenance costs and time. In addition, compared with the drain pipe made of soft material and mounted on the drain valve 820, it is not easy to be easily knocked off by water flow during sewage discharge. The connector module 830 can be designed to adapt to drain pipes of various specifications and types, thereby improving the compatibility and flexibility of the pre-filter and facilitating users to select and replace according to actual needs.

[0106] The joint module 830 can be a quick-disconnect joint structure commonly used in butt-connected water pipes. For example, a male head is fastened to the sewage pipe, and a female head is set on the joint module 830. When connecting, the male head is inserted into the female head, the ejector pin returns to its position, and the steel ball is rolled and locked to achieve connection while allowing fluid circulation. Alternatively, a clamp-type flexible pipe joint, which consists of an end pipe, a pipe clamp, a sealing ring, a bolt and a nut, is used to achieve a quick connection and sealing effect through the cooperation of a split outer clamp and a flexible rubber sealing ring.

[0107] In the scheme of setting the impeller assembly 40, in order to simplify the structure of the product, one end of the connector 810 is fixedly connected with the mounting seat 410. The mounting seat 410 and the filter bottle 10 are not provided with a locking structure, and there is no need to improve the filter bottle 10. The mounting seat 410 is fixed by abutting against the bottle wall of the filter bottle 10 through the periphery, and the connector 810 is fixedly connected with the mounting seat 410 through the connector 810. The connector 810 is externally connected to the sewage pipe, so that the connection between the connector 810 and the mounting seat 410 is more secure, reducing the risk of loosening due to vibration or water flow impact, thereby enhancing the structural stability of the entire pre-filter.

[0108] In addition, the snap-on design makes the installation and removal of the connector 810 and the mounting base 410 simple and quick, without the need for complex tools or professional skills, thus reducing the difficulty of installation and maintenance. The simple installation and removal process and good sealing performance reduce the complexity and cost of daily maintenance, allowing users to more conveniently maintain and repair the equipment.

[0109] In the present invention, the siphon flow of the exoskeleton 50 is also improved. The exoskeleton 50 can be arranged in the water filter chamber 101 alone, or can be used in combination with the impeller assembly 40. The structural improvement of the siphon flow channel 501 of the exoskeleton 50 is introduced below.

[0110] During the use of the pre-filter, impurities attached to the surface of the filter need to be cleaned in situ from time to time and then discharged through the drain valve. The efficient operation of the scraping device 90 is crucial. In the prior art, there are scraping devices 90 driven by motors, scraping devices 90 driven by impellers, etc.; there is also a self-rotating scraping function that uses the impact force of the water flow itself.

[0111] In order to improve the cleaning effect, the prior art provides a siphon channel 501 on the outer frame 50 .

[0112] Reference Figure 1 , Figure 2 and Fig.13 The exoskeleton 50 of the technical solution of the present invention can be used in the pre-filter. On the one hand, the exoskeleton 50 serves as a supporting structure between the filter component 30 and the filter bottle 10, effectively enhancing the stability of the entire pre-filter; on the other hand, through its specific shape and layout, it guides the water flow to pass through the filter component 30 more smoothly, thereby improving the filtration efficiency.

[0113] Specifically, in one embodiment, the outer frame 50 can be rotatably mounted on the filter assembly 30, and a shaft hole for the movable member 720 to pass through is provided in the middle of the chassis. The outer frame 50 rotates relative to the filter assembly along a first circumferential direction.

[0114] The exoskeleton 50 can rotate relative to the filter assembly 30 along the first circumferential direction; the first circumferential direction is the rotation direction, or the swirl direction; in this embodiment, the exoskeleton 50 rotates relative to the filter assembly 30, and the exoskeleton 50 can be rotated by electric drive or manual drive to make the water filter chamber 101 produce swirl, and a water distributor 60 that changes the water flow direction can also be provided on the top of the pre-filter, and the exoskeleton 50 is provided with a water flow driving member 502, so that the exoskeleton 50 can rotate with the help of the water flow; and a scraping device 90 can be further provided on the exoskeleton 50 to clean the filter screen of the filter assembly 30 to achieve the effect of cleaning and improving the sewage discharge, and the scraping device 90 can be bristles or rubber strips, and the scraping device 90 can be provided to clean the inner wall of the filter bottle alone; or clean the filter assembly alone; or clean both at the same time. Further, an impeller assembly 40 is provided at the bottom of the pre-filter to drive the water flow of the water filter chamber 101 to rotate and improve the discharge of sewage during the flushing process.

[0115] The present invention also provides a water system, which includes the aforementioned pre-filter. The specific structure of the pre-filter is as follows: Figures 1 to 13 Since the water use system adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0116] Among them, the water use system at least includes relevant components from the pre-filter to the water use end. For example, the water use system may include household appliances such as water heaters, dishwashers, and water dispensers, and may also include accessories such as water pipes for domestic water use throughout the house.

[0117] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An impeller assembly for a pre-filter, characterized in that: The impeller assembly comprises: An impeller body, wherein the impeller body is provided with a connecting portion, and the connecting portion is used for drivingly connecting to the outer frame of the pre-filter; and The mounting seat is provided with an impeller cavity, and the impeller body can be rotatably mounted in the impeller cavity. One axial side of the mounting seat is provided with a first water inlet connecting the impeller cavity and the outside of the mounting seat; the circumferential side of the mounting seat is provided with a second water inlet connecting the impeller cavity and the outside of the mounting seat; the other axial side of the mounting seat is provided with a drain outlet connecting the impeller cavity and the sewage outlet of the pre-filter.

2. The impeller assembly according to claim 1, characterized in that The first water inlet is inclined from the top of the mounting seat toward the bottom of the mounting seat along the same circumferential direction.

3. The impeller assembly according to claim 2, characterized in that The mounting seat is also provided with a water retaining ring for preventing water from flowing in. The first water inlet is provided with a plurality of first water inlets, and the plurality of first water inlets are all arranged in the water retaining ring, and the plurality of first water inlets are all connected to the siphon flow channel of the pre-filter.

4. The impeller assembly according to claim 1, characterized in that: A plurality of second water inlets with the same circumferential opening are arranged at intervals on the circumferential side of the mounting seat; and a water guiding slope is arranged at the second water inlet along the water inflow direction.

5. The impeller assembly according to claim 1, characterized in that: A water inlet channel is also provided on the peripheral side of the mounting seat, and the water inlet channel connects the second water inlet and the water filter cavity of the pre-filter, and the flow cross-section of the water inlet channel decreases in the direction away from the second water inlet.

6. The impeller assembly according to claim 1, characterized in that: There are multiple drainage ports, and the multiple drainage ports surround the impeller body.

7. The impeller assembly according to claim 6, characterized in that The plurality of drain outlets are all arranged at an angle; and / or the plurality of drain outlets are of the same size and / or shape.

8. The impeller assembly according to claim 1, wherein: The impeller body includes an impeller shaft and a plurality of blades obliquely arranged on the impeller shaft. The water flows from the first water inlet and the second water inlet can cause the blades to drive the impeller shaft to rotate.

9. The impeller assembly according to claim 8, characterized in that The blade is tilted along the axial direction of the impeller shaft, and one end away from the impeller shaft is bent in the circumferential and axial directions to form a curved surface. At least part of the blade corresponds to the first water inlet and the second water inlet.

10. The impeller assembly according to claim 8, characterized in that The end of the impeller shaft passes through the mounting seat, and the connecting portion is a plurality of protrusions arranged on the upper end surface of the impeller shaft.

11. The impeller assembly according to claim 1, wherein: The mounting seat includes a first shell and a second shell that are detachably connected, the second shell covers the first shell to form the impeller chamber, the first water inlet is arranged on the axial side of the first shell, and the second water inlet is arranged on the circumferential side of the first shell; the drain port is arranged in the second shell.

12. The impeller assembly according to claim 1, wherein: The impeller body is hollow to form an avoidance hole, which passes through the mounting seat so that the movable part of the pre-filter can pass through.

13. A pre-filter, characterized in that: It comprises an impeller assembly as claimed in any one of claims 1 to 12 and an exoskeleton drivingly connected to the impeller assembly.

14. The pre-filter according to claim 13, characterized in that: The pre-filter also includes a valve head and a filter bottle connected to the valve head, and a water distributor arranged on the valve head and / or the filter bottle. The valve head has a water inlet, and the raw water entering the filter bottle from the water inlet passes through the water distributor to generate a vortex.

15. The pre-filter according to claim 14, characterized in that: The mounting seat is sealed and connected to the filter bottle.

16. The pre-filter according to claim 13, characterized in that: The pre-filter also includes a filter assembly, and the outer frame is also provided with a scraping device for cleaning the filter assembly and / or the filter bottle.

17. The pre-filter according to claim 13, characterized in that: A water flow driving component is arranged on the inner periphery of the outer frame, and the water flow driving component can drive the outer frame to rotate under the drive of water flow.

18. The pre-filter according to claim 13, characterized in that: The pre-filter also includes a sewage discharge assembly, and the sewage discharge assembly is connected to the mounting seat.

19. A water system, characterized in that: Comprising a pre-filter as claimed in any one of claims 13 to 18.

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