CN110812943B

CN110812943B - Filtering structure, pre-filter and filtering method

Info

Publication number: CN110812943B
Application number: CN201911076404.8A
Authority: CN
Inventors: 李国平; 王娟; 宋广明
Original assignee: Shenzhen Angel Drinking Water Equipment Co Ltd
Current assignee: Shenzhen Angel Drinking Water Equipment Co Ltd
Priority date: 2019-11-06
Filing date: 2019-11-06
Publication date: 2021-11-19
Anticipated expiration: 2039-11-06
Also published as: CN110812943A

Abstract

The disclosure relates to a filter structure, a pre-filter and a filtering method. The filter structure includes: the inner part of the shell is a cavity with an opening at the top end, and the bottom of the shell is provided with a sewage outlet; the diversion piece comprises a water outlet flow channel and a water inlet flow channel, the water outlet flow channel is arranged along the axial direction, the water inlet flow channel is positioned on the outer side of the water outlet flow channel, the diversion piece seals the top end opening of the shell, and the water inlet flow channel and the water outlet flow channel are respectively communicated with the cavity; the central tube comprises a tube body and a supporting plate; the side wall of the pipe body is provided with a plurality of water inlets, and the top end of the pipe body is provided with a water outlet; the supporting plate is positioned at the bottom end of the pipe body; the central tube is positioned in the cavity, the top end of the central tube is connected with the flow guide piece, and a water outlet of the central tube is communicated with a water outlet flow channel of the flow guide piece; the lamination subassembly is established the lamination on the center tube including a plurality of cover in proper order, and water gets into the center tube through the filter gap of lamination subassembly. This disclosed filtration improves impurity separation efficiency through the multistage separation, and the part is difficult for blockking up.

Description

Filtering structure, pre-filter and filtering method

Technical Field

The disclosure belongs to the field of filtering equipment, and particularly relates to a filtering structure, a pre-filter and a filtering method.

Background

The pre-filter can be used for filtering large-particle substances such as silt, rust and the like in tap water. The pre-filter is generally installed at the foremost end of the water using pipe. The prefilter on the market at present adopts the filter screen to filter usually, uses after a period of time, will be blocked by some fine sand or other impurity on the filter screen in the prefilter, needs to clear up it. When the filter screen is cleaned, the filter screen is directly washed, impurities attached to the filter screen are washed by the aid of impulsive force of water flow, and then the impurities are discharged from the drain valve. However, it is difficult to completely wash out impurities clogged in the steel mesh, and the water flux is reduced by long-term use.

Disclosure of Invention

The disclosure aims to provide a filtering structure, a pre-filter and a filtering method, which gradually separate impurities from coarse to fine, have high filtering efficiency and are not easy to block.

One embodiment of the present disclosure provides a filter structure, including: the inner part of the shell is a cavity with an opening at the top end, and the bottom of the shell is provided with a sewage outlet; the flow guide piece comprises a water outlet flow passage arranged along the axial direction and a water inlet flow passage positioned on the outer side of the water outlet flow passage, the flow guide piece seals the top end opening of the shell, and the water inlet flow passage and the water outlet flow passage are respectively communicated with the cavity; the central tube comprises a tube body and a supporting plate; a plurality of water inlets are formed in the side wall of the pipe body, and a water outlet is formed in the top end of the pipe body; the supporting plate is positioned at the bottom end of the pipe body; the central pipe is positioned in the cavity, the top end of the central pipe is connected with the flow guide piece, and a water outlet of the central pipe is communicated with a water outlet flow channel of the flow guide piece; the lamination subassembly is established including a plurality of cover in proper order the lamination on the center tube, water process the filter gap entering of lamination subassembly the center tube.

According to some embodiments of the disclosure, the laminate comprises: the center of the annular part is provided with a through hole, and the central pipe penetrates through the through hole; the circular truncated cone is characterized in that a circular truncated cone cavity is arranged in the circular truncated cone, the annular part seals the small-diameter end of the circular truncated cone, and the wall thickness of the circular truncated cone is gradually reduced from the small-diameter end to the large-diameter end.

According to some embodiments of the present disclosure, the upper surface of the ring portion of the lamination is provided with a plurality of tie bars extending from the edge of the ring portion to the through hole; the flow guide piece is pressed by a plurality of lamination sheets from the upper part, and the upper surface of the annular part of each lamination sheet, the flow guide strip and the lower surface of the annular part of the adjacent lamination sheet form the filtering gap.

According to some embodiments of the disclosure, the gib is arc-shaped.

According to some embodiments of the present disclosure, the plurality of the guide strips are uniformly distributed along the circumferential direction.

According to some embodiments of the present disclosure, the width of the guide strip is 10 μm to 5mm, and the height of the guide strip is 5 μm to 1 mm.

According to some embodiments of the present disclosure, the filter structure further comprises an elastic member, one end of the elastic member abuts against the flow guide member, and the other end abuts against the uppermost lamination; the water pushes the uppermost lamination to move upwards, and the filtering gaps are formed between the adjacent laminations.

According to some embodiments of the present disclosure, an inclination angle of the outer wall of the circular table portion with respect to the upper surface of the annular portion is 15-75 °.

According to some embodiments of the present disclosure, the water inlet channel of the flow guide member is a vortex type, the water inlet of the water inlet channel is located on the upper surface of the flow guide member, and the water outlet of the water inlet channel is located on the lower surface of the flow guide member.

According to some embodiments of the present disclosure, a limiting flange extends from a side wall of the flow guide member in a radial direction, a limiting groove is disposed at an opening at a top end of the housing, and the limiting flange is disposed in the limiting groove.

According to some embodiments of the present disclosure, the number of the position-limiting flanges is plural, and the plural position-limiting flanges are uniformly distributed along the circumferential direction.

According to some embodiments of the present disclosure, the top end of the outer wall of the housing is provided with a first external thread.

According to some embodiments of the present disclosure, an internal thread is provided in the water outlet flow passage, a second external thread is provided at the top end of the pipe body of the central pipe, and the internal thread is connected to the second external thread.

According to some embodiments of the present disclosure, the housing further comprises a flow guide block extending from an inner wall of the cavity to the drain outlet.

An embodiment of the present disclosure also provides a pre-filter, including: the end cover comprises a water inlet and a water outlet; in the filter structure, the top end of the shell is connected with the end cover, the water inlet of the end cover is communicated with the water inlet flow channel, and the water outlet of the end cover is communicated with the water outlet flow channel; and the blow-down valve is positioned at the blow-down port and used for controlling the opening and closing of the blow-down port.

An embodiment of the present disclosure also provides a method of filtering with a pre-filter as described above, comprising: inputting water into the cavity of the shell through the water inlet of the end cover and the water inlet flow channel of the flow guide piece; part of impurities in the water in the cavity are settled to the bottom of the shell, and the water level in the cavity rises; the water in the cavity enters the central pipe through the filtering gap of the lamination assembly and the water inlet of the central pipe; and water in the central pipe flows out through the water outlet flow channel of the flow guide piece and the water outlet of the end cover.

According to the filtering structure, the pre-filter and the filtering method, water flows to the bottom of the cavity after entering the filtering structure, then flows from bottom to top, and impurities with large mass are separated out firstly; the lamination generates certain resistance to particle impurities to separate larger impurities in water; water flows into the central tube through the gaps of the laminated assemblies, and particle impurities with the particle size larger than the size of the gaps are blocked outside the central tube, so that the filtration of smaller impurities is realized; the filtering structure gradually separates the impurities from large to small, and has high separation efficiency, large flow and difficult blockage.

Drawings

FIG. 1 is a schematic view of a filter structure according to one embodiment of the present disclosure;

FIG. 2 is a cross-sectional view of a filter structure according to one embodiment of the present disclosure;

FIG. 3 is a schematic view of a housing according to an embodiment of the present disclosure;

FIG. 4 is a cross-sectional view of a housing of an embodiment of the present disclosure;

FIG. 5 is a cross-sectional view of an embodiment of a baffle of the present disclosure;

FIG. 6 is a first schematic view of a baffle according to an embodiment of the present disclosure;

FIG. 7 is a second schematic view of a baffle according to an embodiment of the present disclosure;

FIG. 8 is a schematic view of a core tube according to an embodiment of the present disclosure;

FIG. 9 is a schematic view of a lamination stack according to one embodiment of the present disclosure;

FIG. 10 is a cross-sectional view of a lamination stack according to one embodiment of the present disclosure;

FIG. 11 is an enlarged view of a filter gap according to one embodiment of the present disclosure;

FIG. 12 is a schematic view of a waste valve coupling according to an embodiment of the present disclosure;

FIG. 13 is a cross-sectional view of another embodiment of a filter structure according to the present disclosure;

FIG. 14 is a schematic view of a laminate according to another embodiment of the present disclosure;

FIG. 15 is a cross-sectional view of a laminate according to another embodiment of the present disclosure;

FIG. 16 is a schematic view of a filter gap according to another embodiment of the present disclosure;

FIG. 17 is a schematic view of a pre-filter according to one embodiment of the present disclosure;

FIG. 18 is a schematic view of an end cap according to an embodiment of the disclosure;

FIG. 19 is a schematic view of an end cap coupled to a housing according to an embodiment of the present disclosure.

Detailed Description

In the following, only certain exemplary embodiments are briefly described. As those skilled in the art can appreciate, the described embodiments can be modified in various different ways, without departing from the spirit or scope of the present disclosure. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.

In the description of the present disclosure, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "straight", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be considered as limiting the present disclosure. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present disclosure, "a plurality" means two or more unless specifically limited otherwise.

Throughout the description of the present disclosure, it is to be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection, either mechanically, electrically, or otherwise in communication with one another; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present disclosure can be understood by those of ordinary skill in the art as appropriate.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise the first and second features being in direct contact, or may comprise the first and second features being in contact, not directly, but via another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the disclosure. To simplify the disclosure of the present disclosure, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present disclosure. Moreover, the present disclosure may repeat reference numerals and/or reference letters in the various examples, which have been repeated for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or arrangements discussed. In addition, the present disclosure provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

The preferred embodiments of the present disclosure will be described in conjunction with the appended drawings, it being understood that the preferred embodiments described herein are merely for purposes of illustrating and explaining the present disclosure and are not intended to limit the present disclosure

The disclosure provides a filtering structure, a pre-filter and a filtering method. The filter structure includes a housing, a baffle, a center tube, and a lamination assembly. The shell is internally provided with a cavity, the flow guide piece is arranged at the top end of the shell, and the water inlet channel and the water outlet channel of the flow guide piece are communicated with the cavity of the shell. The central tube and the lamination assembly are arranged in a cavity of the shell, the lamination assembly is sleeved on the central tube, and a gap of the lamination assembly is communicated with a water inlet of the central tube. The water outlet of the central pipe is communicated with the water outlet flow passage of the flow guide piece.

During filtering, the sewage draining port in the bottom of the casing is closed, and water enters the cavity of the casing via the water inlet flow passage of the flow guiding part and flows from the top to the bottom of the cavity and then flows from bottom to top inside the cavity. After the water level in the cavity exceeds the gap of the lamination assembly, water enters the center tube through the gap. The water in the central tube flows out of the filtering structure through the water outlet flow passage of the flow guide piece.

Example 1

As shown in fig. 1 and 2, embodiments of the present disclosure provide a filter structure 1. The filter structure 1 comprises a housing 100, a flow guide 200, a central tube 300 and a lamination assembly 400. Through the cooperation of each part, the filtration 1 of this embodiment realizes the quick filtration to water.

As shown in fig. 3 and 4, the housing 100 has an approximately cylindrical shape and an internal cavity 110. The top of the cavity 110 is provided with an opening 120, and the bottom of the housing 100 is a sewage draining outlet 130 communicated with the cavity 110.

Optionally, the top end of the outer wall of the housing 200 is provided with a first external thread 160. The first external thread 160 is used for connection of the housing to other components. A flange 170 extends radially below the first external threads 160.

As shown in fig. 5 to 7, the center of the flow guide member 200 is provided with a water outlet channel 210 along the axial direction. The outlet flow passage 210 extends upward beyond the upper surface of the guide member 200. An inlet flow passage 220 is provided outside the outlet flow passage 220. In the flow guide member 200, the water outlet channel 210 and the water inlet channel 220 are not communicated with each other, so as to avoid mutual interference of water inlet and water outlet. The baffle 200 is mounted to the top end of the housing 100, closing the top opening 120 of the housing. The water inlet flow passage 220 and the water outlet flow passage 210 are respectively communicated with the cavity 110. The water enters the hollow cavity 110 of the housing through the water inlet channel 220, and flows out through the water outlet channel 210 after being filtered.

After entering the cavity 110 of the housing through the water inlet channel 220, the water flows from top to bottom to the bottom of the cavity 110, and then flows from bottom to top. When the water flows from top to bottom to top, the granular impurities with large mass in part of the water are separated and sink to the sewage outlet 130.

According to an optional technical scheme of the present disclosure, the water inlet channel 220 of the flow guide is a vortex type, the water inlet 221 of the water inlet channel is located on the upper surface of the flow guide 200, and the water outlet 222 of the water inlet channel is located on the lower surface of the flow guide 200. The vortex-type water inlet channel 220 is arranged, and water enters the cavity 110 through the water inlet channel 220 and then rotates at a high speed from top to bottom along the inner wall of the cavity 110 in a vortex manner under the guidance of the water inlet channel 220. In the water flow rotating at high speed, large-particle impurities with large mass are separated out due to the action of centrifugal force. The large granular impurities separated by the centrifugal force drop to the drain outlet 130 along the inner wall of the cavity 110.

Optionally, the sidewall of the baffle 200 extends radially beyond the retention flange 230. The top opening 110 of the housing is provided with a limiting groove 150, and a limiting flange 230 is arranged in the limiting groove 150. The cooperation of the position-limiting flange 230 and the position-limiting groove 150 supports and limits the air guide member 200.

The number of the position-limiting flanges 230 may be plural, and the plural position-limiting flanges 230 are evenly distributed in the circumferential direction. The number of the stopping grooves 150 corresponds to the number of the stopping flanges 230. In this embodiment, the number of the limiting flanges 230 is two, and two limiting grooves 150 are correspondingly arranged at the top end opening 110 of the housing.

As shown in fig. 8, the center tube 300 includes a tube body 310 and a retainer plate 320. The tube 310 has a tubular structure penetrating therethrough. The support plate 320 is located at the bottom end of the tube body 310, and closes the bottom end of the tube body 310.

A plurality of water inlets 311 are formed on a sidewall of the pipe body 310, and water flows into the pipe body 310 through the water inlets 311. In this embodiment, the plurality of water inlets 311 are spirally distributed. The distribution of the water inlets 311 on the sidewall of the tube 310 can be adjusted as desired, so that water can flow into the tube 310. The top end of the tube 310 is provided with a water outlet 312, and water in the tube 310 flows out through the water outlet 312.

The central tube 300 is located in the cavity 110, the top end of the central tube 300 is connected with the flow guide member 200, and the water outlet 312 of the central tube is communicated with the water outlet channel 220 of the flow guide member. The water in the tube 310 flows out through the water outlet 312 and the water outlet channel 220.

According to an optional technical scheme of the present disclosure, an internal thread 211 is disposed in the water outlet flow passage 210, a second external thread 330 is disposed at the top end of the tube body 310 of the central tube, and the internal thread 211 is in threaded connection with the second external thread 330, so as to connect the central tube 300 with the flow guide member 200. The connection between the central tube 300 and the flow guide member 200 is not limited to this, and other connection methods, such as a snap connection and a snap connection, may be adopted.

The lamination assembly 400 includes a plurality of laminations that are sequentially nested on a center tube, and water enters the center tube through the filter gap of the lamination assembly.

As shown in fig. 9-11, the lamination of the present embodiment is a lamination 400 a. The lamination 400a includes a ring portion 410, a dome portion 420, and tie bars 430. The ring portion 410 is annular and has a through hole 411 at the center. The circular truncated cone portion 420 is circular truncated cone-shaped, a circular truncated cone cavity 421 is formed therein, and the annular portion 410 closes a small-diameter end of the circular truncated cone portion 420. The upper surface of the annular portion 410 is provided with a plurality of flow guide strips 430, and the flow guide strips 430 extend from the edge of the annular portion 410 to the through hole 411.

The central tube 200 passes through the through hole 411, and the plurality of lamination sheets 400a are sequentially sleeved on the central tube 200 from bottom to top. The guide bar 430 of the lower lamination supports the lower surface of the upper ring portion 410, a plurality of laminations 400a are sequentially stacked, and the lowermost lamination 400a is positioned on the support plate 320. The diameter of the support plate 320 is larger than the diameter of the through hole 411, and the support plate 320 supports the lamination assembly 400. The guide 200 presses the uppermost lamination 400a from above, thereby compressing the stacked plurality of laminations 400a and restricting the movement of the laminations 400a in the vertical direction. Optionally, a rubber gasket is disposed between the flow guide member 200 and the uppermost lamination 400a to seal the flow guide member 200 and the uppermost lamination 400a from water flowing in.

The wall thickness of the boss 420 of the lamination 400a gradually decreases from the small diameter end to the large diameter end. When a plurality of laminations 400a are stacked, a necking portion 440 with a gradually decreasing width from outside to inside is formed between two adjacent circular table portions 420. The water flows from top to bottom to the bottom of the cavity 110 after entering the cavity 110, and then flows from bottom to top from the bottom of the cavity 110. The water from bottom to top flows into the throat 440, and part of the particle impurities in the water is decelerated by resistance after impacting the circular table part 420 and sinks to the sewage outlet 130 along the inclined plane under the action of gravity.

The upper surface of the ring portion 410 of the lamination 400a, the guide strips 430 and the lower surface of the ring portion of the adjacent lamination 400a form a filter gap 450. The filter gap 450 is of a small size to keep particulate impurities that cannot enter the filter gap 450 out of the center tube 300. Water passing through the filtering gap 450 enters the central tube 300 through the water inlet 311. Particulate impurities in the water are caught at the outer edge of the filtering gap 450, and the particulate impurities at the outer edge of the filtering gap 450 sink at the soil discharge opening 130 along the outer wall 422 of the circular table due to the gravity thereof after the water flow is stopped.

Optionally, the width of the flow guide strip 430 is 10 μm to 5mm, and the height of the flow guide strip 430 is 5 μm to 1 mm. In this embodiment, the flow guide strips 430 are arc-shaped. The water entering the cavity 110 flows in a vortex-type manner, and the shape of the guide strips 430 is similar to the rotation track of the water vortex, so that the resistance of the water flowing into the filtering gap 450 can be reduced. The plurality of guide strips 430 may be evenly distributed in the circumferential direction.

Optionally, the outer wall 422 of the circular table has an inclination angle of 15-75 ° with respect to the upper surface of the annular portion 410, so that the circular table blocks particulate impurities in the water flow. The lamination 400a may be ring-shaped without the dome 420, and may also provide water filtration, as desired.

The filtering structure 1 of the present embodiment closes the drain outlet 130 when water filtering is performed, and the separated particle impurities are accumulated at the drain outlet 130. The shell 100 comprises a flow guide block 140, the flow guide block 140 extends from the inner wall of the cavity 110 to the sewage outlet 130, and the flow guide blocks 140 are uniformly distributed in the circumferential direction. The flow guide block 140 plays a role in guiding the separated particle impurities. When the sewage discharge is required, the sewage discharge port 130 is opened to discharge the accumulated particulate impurities.

As shown in fig. 12, a waste valve coupling 500 is optionally installed at the waste outlet 130, and the waste valve coupling 500 is used to couple a waste valve. The center of the waste valve connector 500 is a through hole 520, one end of the waste valve connector is provided with a flange 510, and the outer wall of the other end of the waste valve connector is provided with a third external thread 530. The flange 510 of the waste valve coupling 500 is received in the housing 100 at one end thereof to be in contact with the bottom of the cavity 110, and the third male screw 530 extends at one end thereof to extend out of the waste outlet 130. The through-holes 520 are used to discharge accumulated particulate impurities.

In the filter structure 1 of the present embodiment, the water flows into the cavity 110 and rotates at a high speed, and the particle impurities with large mass in the water are separated by centrifugal force. When the water flows from bottom to top, the granular impurities in the water collide against the dome 420 of the lamination sheet, separating a part of the impurities. Particulate impurities in the water that cannot pass through the filtering gap 450 are separated by the minute filtering gap 450. Through the multilayer separation, the filtration 1 of this embodiment separates the particle impurity in with aquatic step by big to little, and filtration efficiency is high, and the flow is big simultaneously, is difficult for blockking up.

Example 2

As shown in fig. 13, the filter structure 2 of the present embodiment is the same as the housing 100, the flow guide 200, the center tube 300 and the waste valve connector 500 of the filter structure 1 of embodiment 1.

As shown in fig. 14-16, the lamination of the present embodiment is a lamination 400 b. The lamination 400b includes a ring portion 410 and a dome portion 420. The ring portion and the dome portion of the present embodiment are the same in structure as those of embodiment 1. The central tube 300 passes through the through hole 411, and the plurality of lamination sheets 400b are sequentially sleeved on the tube body 310. A plurality of laminations 400b are stacked from bottom to top, and the pallet 320 supports the lowermost lamination 400 b.

As shown in fig. 13, an elastic member 600 is provided between the flow guide member 200 and the lamination assembly 400. The elastic member 600 of the present embodiment is a spring. One end of the elastic member 600 abuts against the guide member 200 and the other end abuts against the uppermost lamination 400 b. The elastic member 600 compresses the stacked plurality of laminations 400 b. When no external force is applied, a throat 440 is formed between the circular truncated parts 420 of two adjacent laminations 400b, and the ring part 410 of the lower lamination 400b is in contact with the ring part 410 of the upper lamination 400b without forming a gap.

The water enters the cavity 110 through the water inlet flow passage 220, flows to the bottom of the cavity 110, and then flows from bottom to top. The water in the cavity 110 flows upward, the lamination assembly 400 receives the impact of the water, and the uppermost lamination 400b moves upward, compressing the elastic member 600. The annular portions 410 of two adjacent laminations 400b are separated to form a filter gap 460. Water passes through the filtering gap 460 into the center tube 300 and particulate impurities that cannot enter the filtering gap 460 are blocked outside the filtering gap 460. The size of the filtering gap 460 can be adjusted by changing the elastic force of the spring under the condition that the pressure and the flow rate of the water entering the cavity 110 are constant. After the water stops flowing into the cavity 110, the ring parts 410 of the adjacent two laminations 400b are contacted due to the elastic force of the elastic member 600, the filtering gap 460 is disappeared, and the blocked particulate impurities are settled to the drain outlet 130.

Alternatively, a rubber gasket is disposed between the elastic member 600 and the uppermost lamination 400b, and the elastic member 600 indirectly abuts against the uppermost lamination 400 b. Rubber gaskets are provided to prevent water from entering the center tube 200 from the uppermost lamination 400b in the gap thereof.

The filter structure 2 of the embodiment, the water flows into the cavity 110 to rotate at a high speed, the particle impurities with large mass in the water are separated by centrifugal force, and the particle impurities are settled to the sewage outlet 130. When the water flows from bottom to top, the particle impurities in the water collide with the circular table part 420 of the lamination sheet to separate part of the particle impurities, and the particle impurities sink to the sewage outlet 130. The water flows upward, generating an upward force on the lamination 400b, so that the uppermost lamination 400b moves upward, compressing the elastic member 600. The annular portions 410 of two adjacent laminations 400b are separated to form a filter gap 460. Water passes through the filtering gap 460 into the center tube 300 and particulate impurities that cannot enter the filtering gap 460 are blocked outside the filtering gap 460. The water entering the center tube 300 flows out through the outlet flow passage 210.

Through the multilayer separation, the filtration 2 of this embodiment separates the particle impurity in with the aquatic step by big to little, and filtration efficiency is high, and the flow is big simultaneously, is difficult for blockking up.

Example 3

As shown in fig. 17, the present embodiment provides a pre-filter. The pre-filter includes: end cap 700, filter structure, and blowoff valve 800. The filter structure may be the filter structure 1 of example 1, or may be the filter structure 2 of example 2. End cap 700 is located at the top end of the filter structure and blowoff valve 800 is located at the bottom end of the filter structure.

As shown in fig. 18 and 19, the top end of the housing 100 penetrates into the bottom end of the end cap 700, the bottom end of the end cap 700 is provided with internal threads, and the internal threads of the end cap 700 are connected with the first external threads 160 of the housing, so that the connection between the end cap 700 and the filter structure is realized. The flange 170 limits excessive penetration of the housing 100 into the end cap 700. The end cap 700 comprises a water inlet 710 and a water outlet 720, the water inlet 710 of the end cap is communicated with the water inlet channel 220, and the water outlet 720 of the end cap is communicated with the water outlet channel 210. Water flows into the inlet channel 220 from the inlet 710 of the end cap, and filtered water flows into the outlet 720 of the end cap through the outlet channel 210. The arrows in fig. 19 represent the flow direction of hand water.

The blow-down valve 800 is located at the blow-down outlet 130, and the interface of the blow-down valve 800 is connected with the third external thread 530 of the blow-down valve connector 500. The soil discharge valve 800 controls the opening and closing of the soil discharge port 130. The blowoff valve 800 is closed when water is filtered, and the blowoff valve 800 is opened when particle impurities accumulated in the housing need to be removed. The blow-down valve 800 may be an existing blow-down valve.

The embodiment also provides a method for filtering by using the prefilter, which comprises the following steps:

water is input into the cavity of the shell through the water inlet of the end cover and the water inlet flow channel of the flow guide piece.

Part of impurities in the water in the cavity sink to the bottom of the shell, and the water level in the cavity rises.

Water in the cavity enters the central tube through the filtering gap of the lamination assembly and the water inlet of the central tube.

The water in the central pipe flows out through the water outlet flow channel of the flow guide piece and the water outlet of the end cover.

According to the filtering structure, the pre-filter and the filtering method, water is subjected to multi-stage separation, impurities from large to small are gradually separated, the separation efficiency is high, the flow is large, and the blockage is not easy to occur.

The above description is only exemplary of the present disclosure and should not be taken as limiting the disclosure, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present disclosure should be included in the scope of protection of the present disclosure.

Finally, it should be noted that: although the present disclosure has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the disclosure. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.

Claims

1. A filter structure, comprising:

the inner part of the shell is a cavity with an opening at the top end, and the bottom of the shell is provided with a sewage outlet;

the flow guide piece comprises a water outlet flow passage arranged along the axial direction and a water inlet flow passage positioned on the outer side of the water outlet flow passage, the flow guide piece seals the top end opening of the shell, and the water inlet flow passage and the water outlet flow passage are respectively communicated with the cavity;

the central tube comprises a tube body and a supporting plate; a plurality of water inlets are formed in the side wall of the pipe body, and a water outlet is formed in the top end of the pipe body; the supporting plate is positioned at the bottom end of the pipe body; the central pipe is positioned in the cavity, the top end of the central pipe is connected with the flow guide piece, and a water outlet of the central pipe is communicated with a water outlet flow channel of the flow guide piece;

the laminated assembly comprises a plurality of laminated sheets which are sequentially sleeved on the central pipe, water enters the central pipe through the filtering gap of the laminated assembly, and the laminated assembly is supported by the supporting plate when the water is not filtered;

wherein the lamination includes:

the center of the annular part is provided with a through hole, and the central pipe penetrates through the through hole;

the circular truncated cone is characterized in that a circular truncated cone cavity is arranged in the circular truncated cone, the annular part seals the small-diameter end of the circular truncated cone, and the wall thickness of the circular truncated cone is gradually reduced from the small-diameter end to the large-diameter end.

2. A filter structure according to claim 1, wherein the upper surface of the annular portion of the lamination is provided with a plurality of flow-guide strips extending from the edge of the annular portion to the through-holes;

the flow guide piece is pressed by a plurality of lamination sheets from the upper part, and the upper surface of the annular part of each lamination sheet, the flow guide strip and the lower surface of the annular part of the adjacent lamination sheet form the filtering gap.

3. The filter structure according to claim 2, wherein the flow guide strips are arc-shaped.

4. The filter structure according to claim 2, wherein a plurality of the guide strips are circumferentially and uniformly distributed.

5. The filter structure according to claim 4, wherein the width of the flow guide strips is 10 μm to 5mm, and the height of the flow guide strips is 5 μm to 1 mm.

6. The filter structure according to claim 1, further comprising a resilient member having one end abutting against said flow guide and the other end abutting against the uppermost said stack;

the water pushes the uppermost lamination to move upwards, and the filtering gaps are formed between the adjacent laminations.

7. The filter structure according to claim 1, wherein the outer wall of the circular truncated cone portion is inclined at an angle of 15 to 75 ° with respect to the upper surface of the ring portion.

8. The filter structure according to claim 1, wherein the water inlet passage of the flow guide is a scroll type, the water inlet of the water inlet passage is located on the upper surface of the flow guide, and the water outlet of the water inlet passage is located on the lower surface of the flow guide.

9. The filter structure according to claim 1, wherein a limiting flange extends from a side wall of the flow guide member in a radial direction, a limiting groove is formed at the top end opening of the housing, and the limiting flange is disposed in the limiting groove.

10. The filter structure according to claim 9, wherein the number of the position-defining flanges is plural, and plural ones of the position-defining flanges are circumferentially and uniformly distributed.

11. The filter structure according to claim 1, wherein the top end of the outer wall of the housing is provided with a first external thread.

12. The filter structure according to claim 1, wherein an internal thread is arranged in the water outlet flow passage, a second external thread is arranged at the top end of the tube body of the central tube, and the internal thread is connected with the second external thread.

13. The filter structure of claim 1, wherein the housing further comprises a deflector extending from an inner wall of the cavity toward the waste outlet.

14. A pre-filter, comprising:

the end cover comprises a water inlet and a water outlet;

the filter structure according to any one of claims 1 to 13, wherein the top end of the housing is connected to the end cap, the water inlet of the end cap is connected to the water inlet channel, and the water outlet of the end cap is connected to the water outlet channel;

and the blow-down valve is positioned at the blow-down port and used for controlling the opening and closing of the blow-down port.

15. A method of filtering with the pre-filter of claim 14, comprising:

inputting water into the cavity of the shell through the water inlet of the end cover and the water inlet flow channel of the flow guide piece;

part of impurities in the water in the cavity are settled to the bottom of the shell, and the water level in the cavity rises;

the water in the cavity enters the central pipe through the filtering gap of the lamination assembly and the water inlet of the central pipe;

and water in the central pipe flows out through the water outlet flow channel of the flow guide piece and the water outlet of the end cover.