Pre-filter and water purification equipment

Abstract

The utility model discloses a prefilter and water purification equipment, the prefilter comprises a shell, a filter component and a drainage component are arranged in the shell, the filter component comprises a first spring, the first spring is configured to filter flowing water, and the drainage component is configured to drain the flowing water. The drainage assembly is configured to move in the axial direction of the first spring so as to change the water flowing direction and adjust the telescopic state of the first spring. The first spring serves as a filter screen, so that the washing effect of the pre-filter is improved, and the blocking effect on water flow is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to filter technical field especially relates to a prefilter and water purification equipment. BACKGROUND

[0002] The prefilter is mainly used for filtering the impurities such as silt, rust and floating matter in water. After using for a period of time, the prefilter needs to discharge the accumulated impurities. The existing prefilter generally assists the cleaning of the filter screen by increasing the setting of a scraping brush or a scraping silica gel, but the effect is poor when the water quality is poor.

[0003] The existing prefilter adopts a filtering mode of a woven filter screen, and the woven filter screen is made of steel wire. The structure of its own warp and weft lines is easy to cause the impurities to be adsorbed and stuck on the surface, so that it is difficult to flush clean after filtering the poor water quality with small water pressure, and the screen line occupies a large area and has a large hindering effect on the water flow.

[0004] The existing prefilter also adopts a filtering mode of a laminated sheet and a woven filter screen. In addition to the above-mentioned shortcomings of the woven filter screen, the combination of the laminated sheet and the woven filter screen also has the problem that the laminated sheet is difficult to open completely during flushing, resulting in incomplete flushing. At the same time, the peripheral laminated sheet blocks the impurities on the internal woven filter screen from being flushed out, and also has the problem of a large hindering effect on the water flow.

[0005] The above information disclosed in the background technology is only used to increase the understanding of the background technology of the present application, and therefore, it can include prior art known by those skilled in the art. SUMMARY

[0006] In view of the problems pointed out in the background technology, the utility model provides a prefilter and water purification equipment. By setting a spring type filter screen, the flushing effect of the prefilter is improved, and the hindering effect on the water flow is reduced.

[0007] To achieve the above-mentioned utility model purposes, the utility model adopts the following technical solutions:

[0008] In some embodiments of the present application, a prefilter is provided, which comprises:

[0009] A shell;

[0010] A filter assembly is arranged in the shell, and the filter assembly comprises a first spring configured to filter water flowing therethrough.

[0011] A drainage assembly is arranged in the shell, and the drainage assembly is configured to move along the axial direction of the first spring to change the water flow direction and adjust the extension state of the first spring.

[0012] In some embodiments of the present application, the length of the drainage assembly is adjustable to adjust the pitch of the first spring.

[0013] In some embodiments of the present application, the filter assembly further comprises a first support portion fixedly arranged in the housing, the first spring is sleeved on the first support portion, the outer side of the first support portion is a first water flow space, the inner side of the first support portion forms a second water flow space, and the first support portion is provided with a first water flow opening to communicate the first water flow space with the second water flow space.

[0014] In some embodiments of the present application, one end of the first spring abuts against the first support portion, and the other end abuts against the drainage assembly.

[0015] In some embodiments of the present application, the first support portion is sleeved with a first limiting portion, the first limiting portion is connected with the drainage assembly, the first limiting portion abuts against the first spring, and the first limiting portion moves along the axial direction of the first support portion under the driving of the drainage assembly.

[0016] In some embodiments of the present application, the pre-filter further comprises a drainage opening, the drainage assembly comprises a first drainage portion, the first drainage portion is provided with a second water flow opening to communicate the first water flow space with the drainage opening, and the first drainage portion drives the first spring to stretch when the pre-filter is flushed.

[0017] In some embodiments of the present application, the first support portion is provided with a mounting groove, and the first drainage portion is partially located in the mounting groove.

[0018] In some embodiments of the present application, the drainage assembly further comprises a second drainage portion, the second drainage portion is connected with the first drainage portion, the second drainage portion penetrates through the second water flow space, and the second drainage portion is configured to move along the axial direction of the first spring to adjust the water flow from the water inlet of the pre-filter to one of the first water flow space and the second water flow space.

[0019] In some embodiments of the present application, the second drainage portion is provided with a second spring, the second spring abuts against the first support portion, and the second spring is configured to provide a reset force to the drainage assembly.

[0020] In some embodiments of the present application, a water purification device is further provided, which comprises the pre-filter as described above.

[0021] Compared with the prior art, the present application has the following advantages and positive effects:

[0022] The pre-filter in the application uses the first spring to play the role of filter screen, and uses the gap of the first spring to filter the impurities in the water. Compared with the woven filter screen in the prior art, the spring filter screen has more filtering gaps and smaller resistance to water flow under the same filtering area. When the first spring is back-flushed, the first spring is stretched, the gap is increased, and the impurities adsorbed on the first spring are easily washed away by the water flow, thereby improving the flushing effect.

[0023] Other features and advantages of the present application will become more apparent after reading the detailed description of the application in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0025] Figure 1 It is a structural diagram of the pre-filter according to some embodiments;

[0026] Figure 2 It is a sectional view of the pre-filter according to some embodiments;

[0027] Figure 3 It is a water path schematic diagram when the pre-filter according to some embodiments is filtering;

[0028] Figure 4 It is a water path schematic diagram when the pre-filter according to some embodiments is flushing;

[0029] Figure 5 It is a structural diagram of the first support part according to some embodiments;

[0030] Figure 6 It is a sectional view of the first support part according to some embodiments;

[0031] Figure 7 It is a structural diagram of the first limiting part according to some embodiments;

[0032] Figure 8 It is a sectional view of the first limiting part according to some embodiments;

[0033] Figure 9 It is a structural diagram of the first drainage part according to some embodiments;

[0034] Figure 10A structural diagram of a second drainage portion according to some embodiments;

[0035] Reference signs:

[0036] 100, housing; 110, first water passage space; 120, second water passage space; 131, water inlet; 132, water outlet; 133, drainage outlet; 140, partition wall;

[0037] 200, filter assembly; 210, first spring; 220, first support portion; 221, vertical rib; 222, first water passage opening; 223, mounting groove; 230, first limiting portion; 231, circumferential wall; 232, bottom wall; 233, first extension rib; 234, second extension rib; 235, abutting table; 236, through opening;

[0038] 300, drainage assembly; 310, first drainage portion; 311, first drainage vertical portion; 312, first drainage horizontal portion; 313, groove; 314, second water passage opening; 320, second drainage portion; 321, second support portion; 322, second limiting portion; 323, second water stirring wheel; 324, extension portion; 325, third water passage opening; 330, second spring;

[0039] 400, water distributor;

[0040] 500, first water stirring wheel. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0042] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation to the present application.

[0043] The terms "first", "second", etc. are used only for descriptive purposes and do not connote or imply relative importance or an ordering between or among the indicated technical features. Thus, a feature defined with "first", "second", etc. can include one or more of the features implicitly or explicitly.

[0044] In the description of the present application, it should be noted that unless specifically stated and limited otherwise, the terms "mounting", "connecting", "connection" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected, can be mechanical connection, can also be electrical connection, can be directly connected, can also be indirectly connected through an intermediate medium, and can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] In the present application, unless otherwise specifically stated and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0046] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeatedly refer to numbers and / or letters in different examples, and such repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those skilled in the art can realize the application of other processes and / or the use of other materials.

[0047] In some embodiments of the present application, a water purification device is provided, which filters raw water through a filter.

[0048] The water purification device comprises a pre-filter, which is mainly used for filtering impurities such as silt, rust, floating matter and the like in water.

[0049] Figure 1 It is a structural diagram of the pre-filter,Figure 2 A sectional view of a pre-filter. The pre-filter comprises a housing 100. The housing 100 is provided with a water inlet 131, a water outlet 132 and a drain 133, which are all in communication with the inner cavity of the housing 100.

[0050] The pre-filter further comprises a filter assembly 200. The filter assembly 200 is arranged in the inner cavity of the housing 100. The filter assembly 200 comprises a first spring 210, which is configured to filter water flowing therethrough. The pitch gap of the first spring 210 constitutes a filtering gap, which filters water flowing therethrough. The filtering precision is related to the pitch size of the first spring 210.

[0051] The pre-filter further comprises a drain assembly 300. The drain assembly 300 is arranged in the inner cavity of the housing 100. The drain assembly 300 is configured to move along the axial direction of the first spring 210 to change the water flow direction and adjust the extension state of the first spring 210.

[0052] Specifically, the filter assembly 200 divides the inner cavity space of the housing 100 into a first water passing space 110 and a second water passing space 120. When water flows from the first water passing space 110 to the second water passing space 120, the filter assembly 200 filters the water flowing therethrough, i.e., the water flows through the first spring 210 and is filtered by the pitch gap on the first spring 210. When water flows from the second water passing space 120 to the first water passing space 110, the water flow reversely flushes the filter assembly 200 to flush away the impurities accumulated on the first spring 210.

[0053] The drain assembly 300 can move along the axial direction of the first spring 210. The above-mentioned change of the water flow direction refers to the movement of the drain assembly 300, which makes the water flow from the first water passing space 110 to the second water passing space 120 or from the second water passing space 120 to the first water passing space 110.

[0054] When the pre-filter is filtering, referring to Figure 3 , the drain assembly 300 is in the first position, the first spring 210 is in the contracted state, the water inlet 131 is in communication with the first water passing space 110, and the water outlet 132 is in communication with the second water passing space 120. The water flowing in from the water inlet 131 first enters the first water passing space 110, is filtered by the first spring 210, then flows into the second water passing space 120, and finally flows out through the water outlet 132.

[0055] When the pre-filter is flushing, referring to Figure 4, the first spring 210 is in a stretched state, and the length of the first spring 210 is elongated, so that the impurities adsorbed on the first spring 210 are easily washed away.

[0056] In the pre-filter in the present application, the first spring 210 acts as a filter screen, and the gap of the first spring 210 is used to filter the impurities in the water. Compared with the woven filter screen in the prior art, the spring filter screen has more filtering gaps and smaller resistance to water flow under the same filtering area. When the first spring 210 is back-flushed, the first spring 210 is stretched, and the gap is increased, so that the impurities adsorbed on the first spring 210 are easily washed away by the water flow, thereby improving the washing effect.

[0057] In some embodiments of the present application, the length of the drain assembly 300 is adjustable to adjust the pitch of the first spring 210. In other words, by adjusting the length of the drain assembly 300, the pitch of the first spring 210 is adjusted, so that the filtering precision is adjusted. The longer the length of the drain assembly 300 is, the larger the pitch of the first spring 210 is. The shorter the length of the drain assembly 300 is, the smaller the pitch of the first spring 210 is.

[0058] In some embodiments of the present application, the filter assembly 200 further comprises a first support portion 220, Figure 5 is a structural view of the first support portion 220, Figure 6 is a sectional view of the first support portion 220. The first support portion 220 is fixedly arranged in the inner cavity of the shell 100. The first support portion 220 is a hollow cylindrical structure. The first spring 210 is sleeved on the outer circumferential side of the first support portion 220. The outer side of the first support portion 220 is the first water flowing space 110, and the inner part of the first support portion 220 forms the second water flowing space 120. The first support portion 220 is provided with a first water inlet 222 to communicate the first water flowing space 110 with the second water flowing space 120.

[0059] In a specific embodiment, a plurality of vertical ribs 221 are arranged on the circumferential wall of the first support portion 220, and the first water inlet 222 is formed between adjacent two vertical ribs 221. The area of the first water inlet 222 is large enough to reduce the resistance to water flow. The first support portion 220 supports and installs the first spring 210.

[0060] In some embodiments of this application, one end of the first spring 210 abuts against the first support portion 220, and the other end abuts against the drainage assembly 300. Thus, when the drainage assembly 300 moves along the axial direction of the first spring 210, the length of the first spring 210 will increase or decrease.

[0061] by Figure 2 Taking the indicated orientation as an example, the first spring 210 and the drainage assembly 300 are arranged vertically. The upper end of the first spring 210 is fixed against the first support 220, and the lower end of the first spring 210 is against the drainage assembly 300. When the drainage assembly 300 moves upward, it causes the lower end of the first spring 210 to move upward, and the first spring 210 contracts. When the drainage assembly 300 moves downward, it causes the lower end of the first spring 210 to move downward, and the length of the first spring 210 increases.

[0062] In some embodiments of this application, a first limiting part 230 is sleeved on the first support part 220. Figure 7 This is a structural diagram of the first limiting part 230. Figure 8 This is a cross-sectional view of the first limiting part 230. The first limiting part 230 is connected to the drainage assembly 300 and abuts against the first spring 210. The first limiting part 230 moves along the axial direction of the first support part 220 under the drive of the drainage assembly 300.

[0063] Specifically, the first limiting part 230 is a cylindrical structure open at both ends, and is fitted onto the outer periphery of the first support part 220. The first limiting part 230 includes a circumferential wall 231, which is fitted onto the outer periphery of the first support part 220. An abutment platform 235 is provided on the inner wall of the circumferential wall 231, and the position of the abutment platform 235 is lower than the upper end surface of the circumferential wall 231. The lower end of the first spring 210 is located in the gap between the first support part 220 and the first limiting part 230, and abuts against the abutment platform 235. This gap helps to improve the fixing reliability of the lower end of the first spring 210.

[0064] In some embodiments of this application, the first limiting portion 230 further includes a bottom wall 232, on which an opening 236 is provided, through which a portion of the drainage component 300 passes. The bottom wall 232 is provided with a plurality of first extending ribs 233, which extend laterally and are spaced apart circumferentially along the opening 236. The drainage component 300 is provided with a groove 313, in which the first extending ribs 233 are engaged, thereby achieving a fixed installation between the first limiting portion 230 and the drainage component 300.

[0065] The bottom wall 232 is also provided with a plurality of spaced second extension ribs 234, which extend vertically and abut against the drainage component 300.

[0066] The first extension rib 233 and the second extension rib 234 are arranged to connect the first limiting part 230 and the drainage assembly 300 in multiple places, which helps to improve the connection reliability between the first limiting part 230 and the drainage assembly 300. When the first limiting part 230 is driven by the drainage assembly 300 to move upward to abut against the bottom wall 232 and the first supporting part 220, the drainage assembly 300 is moved upward to a position, which limits the upward movement of the drainage assembly 300.

[0067] In addition, the circumferential wall 231 of the first limiting part 230 is sleeved with the first supporting part 220, and the first limiting part 230 can move up and down relative to the first supporting part 220 under the driving of the drainage assembly 300. The mutual sleeving between the first limiting part 230 and the first supporting part 220 guides the upward and downward movement of the first limiting part 230 and the drainage assembly 300.

[0068] In some embodiments of the present application, the pre-filter further comprises a drainage port 133. The drainage assembly 300 comprises a first drainage part 310, Figure 9 A structure diagram of the first drainage part 310. The first drainage part 310 is provided with a second water passage 314 to communicate the first water flowing space 110 and the drainage port 133. When the pre-filter is flushed, the first drainage part 310 drives the first spring 210 to stretch.

[0069] Specifically, the first drainage part 310 comprises a first drainage horizontal part 312 and a first drainage vertical part 311, which are fixedly connected. The first drainage vertical part 311 penetrates the through port 236, and the outer circumferential wall of the first drainage vertical part 311 is provided with a groove 313. The first drainage horizontal part 312 is in sealing contact with the inner circumferential wall of the shell 100, and a sealing ring is arranged at the contact position. The second extension rib 234 abuts against the first drainage horizontal part 312. When the drainage assembly 300 moves upward or downward, the first drainage horizontal part 312 and the inner circumferential wall of the shell 100 always maintain a sealing state. The first water flowing space 110 and the second water flowing space 120 are both located above the first drainage horizontal part 312, and the water in the first water flowing space 110 flows to the lower part of the first drainage horizontal part 312 through the second water passage 314, and then is discharged from the drainage port 133. The second water passage 314 can be arranged on the first drainage horizontal part 312 or the first drainage vertical part 311. The water flowing gap is formed between two adjacent second extension ribs 234.

[0070] When the pre-filter is flushed, the water entering from the water inlet 131 first flows into the second water flow space 120. Since the drain assembly 300 is partially located in the second water flow space 120, under the impact of the water flow, the drain assembly 300 as a whole moves towards the direction close to the drain port 133. Then, the first drain part 310 drives the first limiting part 230 to move downward synchronously, the length of the first spring 210 increases, the pitch gap of the first spring 210 increases, the water in the second water flow space 120 flows into the first water flow space 110 through the gap, and the impurities on the first spring 210 are flushed away. The water carrying the impurities flows to the lower side of the first drain horizontal part 312 from the second water outlet 314, and finally is drained from the drain port 133.

[0071] When the reverse flushing is performed, the downward movement of the drain assembly 300 is realized by the impact of the water flow. The drain assembly 300 is arranged to be linked with the first spring 210, so as to realize the synchronous elongation of the first spring 210, increase the gap of the first spring 210, and improve the flushing effect of the impurities. The driving mechanism of the first spring 210 is not additionally arranged, the structure is compact, and the operation is reliable.

[0072] In some embodiments of the present application, the first supporting part 220 is provided with a mounting groove 223, and the first drain part 310 has a part located in the mounting groove 223. Specifically, the end of the first supporting part 220 is provided with the mounting groove 223 with an open bottom, and the first drain vertical part 311 is located in the mounting groove 223. A sealing ring is arranged between the outer peripheral wall of the first drain vertical part 311 and the inner peripheral wall of the mounting groove 223. The sleeving structure between the first drain vertical part 311 and the mounting groove 223 helps to improve the mounting stability of the first supporting part 220. The upper end of the first supporting part 220 is fixed, and the lower end is fixed by the sleeving between the first drain vertical part 311, which also plays a guiding role in the up-down movement of the drain assembly 300.

[0073] The top of the mounting groove 223 is provided with an opening, and the first drain vertical part 311 penetrates through the opening. In this way, the up-down movement of the drain assembly 300 will not cause the movement of the first supporting part 220.

[0074] In some embodiments of the present application, the drain assembly 300 further comprises a second drain part 320, Figure 10 A structure diagram of the second drain part 320. The second drain part 320 is connected with the first drain part 310, and the second drain part 320 penetrates through the second water flow space 120. The second drain part 320 is configured to move along the axial direction of the first spring 210, so as to adjust the water flowing from the water inlet 131 of the pre-filter into one of the first water flow space 110 and the second water flow space 120.

[0075] Specifically, the second drainage part 320 comprises a second support part 321, the second support part 321 is a long rod structure, and the second support part 321 is located in the second water flowing space 120. One end of the second support part 321 is fixedly connected with the first drainage vertical part 311. The other end of the second support part 321 is provided with a third water outlet 325, and the second water outlet 314 is used for connecting the water inlet 131 and the second water flowing space 120. The other end of the second support part 321 is also provided with an extension part 324, the extension part 324 extends into the first water flowing space 110, and the extension part 324 is located below the third water outlet 325. The outer wall of the second support part 321 is in sealing contact with the inner wall of the first support part 220. The water inlet 131 and the water outlet 132 are provided with a partition wall 140, and the water inlet 131 and the water outlet 132 are separated.

[0076] When the pre-filter is filtering, referring to Figure 3 , the drainage assembly 300 is in the first position, the third water outlet 325 is located on one side of the water outlet 132, and because the outer wall of the second support part 321 is in sealing contact with the inner wall of the first support part 220, at this time, the water inlet 131 is not connected with the second water flowing space 120, and the water inlet 131 is connected with the first water flowing space 110, and the water flowing from the water inlet 131 first flows into the first water flowing space 110.

[0077] When the pre-filter is reverse flushing, referring to Figure 4 , the drainage assembly 300 moves downward, and the drainage assembly 300 is in the second position, at this time, the third water outlet 325 moves downward to be connected with the water inlet 131, and the extension part 324 also moves downward synchronously, and the extension part 324 closes the water inlet side of the first water flowing space 110, and the water flowing from the water inlet 131 flows into the second water flowing space 120 through the third water outlet 325.

[0078] In some embodiments of the application, the second drainage part 320 is provided with a second spring 330, the second spring 330 abuts against the first support part 220, and the second spring 330 is configured to provide a restoring force to the drainage assembly 300.

[0079] Specifically, the second spring 330 is sleeved on the second support part 321, and the second support part 321 is also sleeved with a second limiting part 322. The upper end of the second spring 330 abuts against the second limiting part 322, and the lower end abuts against the top of the mounting groove 223. When the pre-filter is reverse flushing, the drainage assembly 300 moves downward as a whole, and because one end of the second spring 330 abuts against the fixed first support part 220, the second spring 330 is contracted, and after the reverse flushing is completed, the drainage assembly 300 is reset under the elastic force of the second spring 330.

[0080] In some embodiments of the present application, the first drainage part 310 is threadedly connected with the second drainage part 320. Specifically, the second support part 321 is threadedly connected with the first drainage vertical part 311. Through the threaded connection, the length adjustment of the drainage assembly 300 is realized, so that the pitch adjustment of the first spring 210 is realized, and then the filtering precision of the first spring 210 is adjusted.

[0081] In some embodiments of the present application, the first drainage part 310 is snap-connected with the second drainage part 320. For example, a plurality of snaps are arranged on the inner wall of the first drainage vertical part 311, and the plurality of snaps are arranged at intervals along the height direction of the first drainage vertical part 311. A plurality of snap openings are correspondingly arranged on the second support part 321. The snaps at different heights are snap-connected with the snap openings, so that the length adjustment of the drainage assembly 300 is realized, so that the pitch adjustment of the first spring 210 is realized, and then the filtering precision of the first spring 210 is adjusted.

[0082] In some embodiments of the present application, the pre-filter further comprises a water distributor 400. The water distributor 400 is located in the first water flowing space 110, and the water distributor 400 is sleeved on the outer circumferential side of the first support part 220. The water flowing from the water inlet 131 flows into the first water flowing space 110 through the water distributor 400. The water distributor 400 distributes the water flowing therethrough, so that the water flow is uniformly dispersed in the first water flowing space 110, which helps to improve the filtering effect.

[0083] One side of the water distributor 400 is sealingly connected with the inner wall of the shell 100, and the other side of the water distributor 400 is sealingly connected with the outer wall of the first support part 220. When the pre-filter is back-flushed, the drainage assembly 300 moves downward, the extension part 324 moves downward to abut against the water distributor 400, the extension part 324 covers the water flowing channel on the water distributor 400 to be closed, so that the water inlet 131 is isolated from the first water flowing space 110, and waterway switching is realized.

[0084] In some embodiments of the present application, the pre-filter further comprises a first water stirring wheel 500. The first water stirring wheel 500 is located in the first water flowing space 110, and the first water stirring wheel 500 is sleeved on the outer circumferential side of the first support part 220. The first water stirring wheel 500 is located below the water distributor 400 and is arranged close to the water distributor 400. The first water stirring wheel 500 stirs the water flow flowing down from the water distributor 400, avoids the water flow from directly vertically falling down, and makes the water in the first water flowing space 110 more effectively flow into the second water flowing space 120 through the first spring 210, which helps to improve the filtering effect.

[0085] In some embodiments of the present application, the pre-filter further comprises a second stirring wheel 323 located in the second water flow space 120, and the second stirring wheel 323 is sleeved on the outer circumferential side of the second supporting part 321. During the back flushing, the second stirring wheel 323 rotates under the action of water flow, so that the water is disturbed, which helps to increase the flushing effect.

[0086] In the description of the above-described embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0087] The above is only a specific implementation manner of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A prefilter, characterized by, The utility model relates to a prefilter, comprising: a housing; a filter assembly disposed in the housing, the filter assembly comprising a first spring configured to filter water flowing therethrough; a drain assembly disposed in the housing, the drain assembly configured to move along an axial direction of the first spring to change a water flow direction and adjust an extension state of the first spring.

2. The prefilter of claim 1, wherein a length of the drain assembly is adjustable to adjust a pitch of the first spring.

3. The prefilter of claim 1, wherein the filter assembly further comprises a first support portion fixedly disposed in the housing, the first spring being sleeved on the first support portion, an outer side of the first support portion being a first water flow space, an inner side of the first support portion forming a second water flow space, the first support portion being provided with a first water inlet to communicate the first water flow space with the second water flow space.

4. The prefilter of claim 3, wherein one end of the first spring abuts against the first support portion, and the other end abuts against the drain assembly.

5. The prefilter of claim 3, wherein the first support portion is sleeved with a first limiting portion, the first limiting portion being connected with the drain assembly, the first limiting portion abutting against the first spring, and the first limiting portion moving along an axial direction of the first support portion under the drive of the drain assembly.

6. The prefilter of claim 3, wherein the prefilter further comprises a drain port, the drain assembly comprises a first drain portion, the first drain portion being provided with a second water inlet to communicate the first water flow space with the drain port, and the first drain portion driving the first spring to stretch when the prefilter is flushed.

7. The prefilter of claim 6, wherein the first support portion is provided with a mounting groove, and the first drain portion has a portion located in the mounting groove.

8. The prefilter of claim 6, wherein the drain assembly further comprises a second drain portion, the second drain portion being connected with the first drain portion, the second drain portion penetrating through the second water flow space, and the second drain portion being configured to move along an axial direction of the first spring to adjust a water flow from a water inlet of the prefilter to one of the first water flow space and the second water flow space.

9. The prefilter of claim 8, wherein the second drain portion is provided with a second spring, the second spring abutting against the first support portion, and the second spring being configured to provide a reset force to the drain assembly.

10. A water purification apparatus characterized by comprising: The utility model relates to a prefilter comprising any one of the prefilter as claimed in claims 1 to 9.

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