Pre-filter free of cup disassembly in core replacement process

Abstract

The utility model provides a pre-filter free of cup disassembly in the core replacement process, and relates to the technical field of water purification equipment. By arranging the elastic piece, a supporting and elastic displacement space is provided for axial displacement of the water filtering framework in the filtering cavity. In the normal water filtering process, the first protruding area and the second protruding area are in contact positioning, and the water filtering framework is stably contained in the filtering cavity to achieve the normal water filtering function. When the filtering piece needs to be replaced or cleaned, the water filtering framework is pressed downwards, the water filtering framework axially moves under the cooperation of the elastic piece, the first protruding area and the second protruding area are not in contact, then the water filtering framework is rotated, the first protruding area and the second protruding area are arranged in a staggered mode, and at the moment, the water filtering framework can be directly taken out of the filtering cavity; and then the filtering piece on the surface of the water filtering framework is cleaned or replaced. According to the device, all the components do not need to be disassembled, so that all the components are not damaged, the filtering piece can be cleaned and replaced through downward pressing and rotating, the treatment difficulty is lowered, and the cleaning efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of water purification equipment, and more specifically, to a pre-filter that can avoid disassembling the cup during the filter element replacement process. Background Art

[0002] The pre-filter is the first filtration device for the incoming tap water. By filtering out large particulate impurities in the tap water through the pre-filter, the service life of subsequent water-using devices can be guaranteed. However, as the service life of the pre-filter increases, the impurities accumulated in the pre-filter gradually block the filter screen, resulting in the impact on the normal water use at the end and also affecting the service life of the pre-filter. Therefore, it is necessary to deal with the blockage of the filter screen of the pre-filter.

[0003] Common methods for dealing with the blockage of the filter screen of the pre-filter include replacing or cleaning the filter screen. However, currently, both replacing and cleaning the filter screen require manually disassembling the pre-filter, separating the cup body of the pre-filter from the valve body for controlling the water inlet and outlet, and then taking out the filter screen inside the cup body for replacement or cleaning. This method has low cleaning efficiency and is prone to damaging each component.

[0004] In view of this, the present utility model is specifically proposed. Content of the Utility Model

[0005] The purpose of the present utility model is to provide a pre-filter that can avoid disassembling the cup during the filter element replacement process, which can quickly clean or replace the filter screen without damaging each component.

[0006] The embodiments of the present utility model are implemented as follows:

[0007] In a first aspect, the present utility model provides a pre-filter that can avoid disassembling the cup during the filter element replacement process, including a water inlet and outlet control valve, a cup body, a sewage discharge valve, and a filter element replacement assembly.

[0008] Both ends of the cup body are hermetically connected to the water inlet and outlet control valve and the sewage discharge valve respectively, and a filter cavity is formed inside the water inlet and outlet control valve and the cup body, and the filter element replacement assembly is accommodated in the filter cavity.

[0009] The filter element replacement assembly includes an elastic member, a filter element, a water filtration skeleton, and a limiting end cover; the limiting end cover is hermetically connected to the end of the water inlet and outlet control valve away from the cup body.

[0010] The water filtration skeleton includes a first water filtration skeleton, a second water filtration skeleton, an elastic member limiting part, and a filter element replacement control part.

[0011] A plurality of water filtration holes are provided on both the first water filtration skeleton and the second water filtration skeleton. The first water filtration skeleton and the second water filtration skeleton are hermetically connected, and no water filtration holes are provided at the connection part, and the connection part is correspondingly arranged with the connection part of the water inlet and outlet control valve and the cup body. The first water filtration skeleton is accommodated in the cup body, and the second water filtration skeleton is accommodated in the water inlet and outlet control valve.

[0012] The filter element is arranged on the outer surface of the first water filtering framework, covering the water filtering holes of the first water filtering framework.

[0013] An elastic part limiting portion is arranged on the end face of one end of the first water filtering framework away from the second water filtering framework. One end of the elastic part is fixed on the elastic part limiting portion, and the opposite end extends towards the sewage valve.

[0014] One end of the second water filtering framework away from the first water filtering framework is a filter element replacement control portion. A first annular positioning area is arranged on the cylindrical surface of the filter element replacement control portion, and a first raised area and a first non-raised area are arranged in the first annular positioning area.

[0015] A second annular positioning area is arranged on the inner cylindrical surface of the limiting end cover, and a second raised area and a second non-raised area are arranged in the second annular positioning area.

[0016] The filter element replacement control portion can be selectively rotated relative to the limiting end cover so that the first raised area contacts and positions with the second raised area, or so that the first raised area and the second raised area are arranged in a dislocation manner.

[0017] Optionally, a check valve is further included, and the check valve is arranged in the water outlet of the water inlet and outlet control valve.

[0018] Optionally, a connecting piece is further included. The connecting piece is a hollow cylindrical structure. The connecting piece connects the cup body and the sewage valve, and one end of the elastic part away from the water filtering framework contacts the end face of the connecting piece.

[0019] Optionally, a groove is formed in the end face of the connecting piece, and the elastic part is placed in the groove.

[0020] Optionally, a first raised portion is arranged on the first raised area, and a first positioning piece is arranged on the first raised portion.

[0021] A second raised portion is arranged on the second raised area, and a second positioning piece corresponding to the first positioning piece is arranged on the second raised portion. The first positioning piece and the second positioning piece can be selectively matched for positioning.

[0022] Optionally, one end of the second raised portion is further provided with a first raised limiting portion extending towards the first raised portion.

[0023] Optionally, the first positioning piece is an axial groove formed in the first raised portion, and the second positioning piece is an axial protrusion arranged on the second raised portion.

[0024] Optionally, an operating handle is further arranged on the end face of one end of the filter element replacement control portion away from the second water filtering framework.

[0025] Optionally, the second water filtering framework is hermetically connected to the inner wall surface of the water inlet and outlet control valve.

[0026] Optionally, the first water filtration skeleton and the second water filtration skeleton are of a split structure.

[0027] The beneficial effects of the embodiments of the present utility model are as follows:

[0028] The present utility model provides a pre-filter with a cup that does not need to be disassembled during the filter element replacement process. Through the cooperation of an elastic member, a water filtration skeleton, and a limiting end cap, the elastic member provides support and elastic displacement space for the axial displacement of the water filtration skeleton in the filtration cavity. During normal water filtration, the filter element replacement control part on the water filtration skeleton cooperates with the limiting end cap, and the first convex area and the second convex area are in contact for positioning. The water filtration skeleton is stably accommodated in the filtration cavity to achieve normal water filtration function. When it is necessary to replace or clean the filter element, press down the water filtration skeleton. The water filtration skeleton undergoes axial displacement in cooperation with the elastic member, so that the first convex area and the second convex area are not in contact. Then rotate the water filtration skeleton to misalign the first convex area and the second convex area. At this time, the water filtration skeleton can be directly taken out from the filtration cavity, and then the filter element on the surface of the water filtration skeleton can be cleaned or replaced. This device does not need to disassemble each component, so it will not damage each component, and the cleaning and replacement of the filter element can be achieved by pressing down and rotating, the processing difficulty is reduced, and the cleaning efficiency is improved. Description of the Drawings

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0030] Figure 1 It is an exploded view of the pre-filter with a cup that does not need to be disassembled during the filter element replacement process provided by the embodiments of the present utility model;

[0031] Figure 2 It is a structural schematic diagram of the first water filtration skeleton provided by the embodiments of the present utility model;

[0032] Figure 3 It is a structural schematic diagram of the second water filtration skeleton provided by the embodiments of the present utility model;

[0033] Figure 4 It is a structural schematic diagram of the limiting end cap provided by the embodiments of the present utility model;

[0034] Figure 5 It is a cross-sectional view of the pre-filter with a cup that does not need to be disassembled during the filter element replacement process provided by the embodiments of the present utility model;

[0035] Figure 6 It is Figure 5 an enlarged view of the structure A in

[0036] Figure 7 Schematic diagram of the water filtration process of the pre-filter with a cup that can be replaced without disassembling during the cartridge replacement process provided by the embodiment of the present utility model;

[0037] Figure 8 Schematic diagram of the sewage discharge process of the pre-filter with a cup that can be replaced without disassembling during the cartridge replacement process provided by the embodiment of the present utility model;

[0038] Figure 9 Schematic diagram of the overall removal process of the cartridge replacement provided by the embodiment of the present utility model;

[0039] Figure 10 Schematic diagram of the cleaning process of the filter element provided by the embodiment of the present utility model.

[0040] Icons: 10 - pre-filter; 100 - inlet and outlet control valve; 200 - cup body; 300 - sewage discharge valve; 400 - cartridge replacement assembly; 410 - elastic member; 420 - filter element; 430 - first water filtration skeleton; 431 - elastic member limiting portion; 440 - second water filtration skeleton; 441 - cartridge replacement control portion; 4411 - first convex portion; 4412 - first positioning member; 4413 - first non-convex area; 4414 - operating handle; 450 - limiting end cap; 4511 - second convex portion; 4512 - second positioning member; 4513 - first convex limiting portion; 4514 - second non-convex area; 460 - water filtration hole; 500 - check valve; 600 - connecting member; 700 - sealing ring. Detailed implementation manners

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the present utility model claimed, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts fall within the scope of protection of the present utility model.

[0043] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0044] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this utility model is customarily placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0045] In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging vertically, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0046] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0047] Please refer to Figure 1 , this embodiment provides a pre-filter 10 with a cartridge-changing process that does not require disassembling the cup, which includes an inlet and outlet control valve 100, a cup body 200, a sewage discharge valve 300, and a cartridge-changing assembly 400.

[0048] Among them, the structures of the inlet and outlet control valve 100, the cup body 200, and the sewage discharge valve 300 can be the structures of the existing pre-filter 10. For example, the inlet and outlet control valve 100 includes an inlet, an outlet, and a mounting port connected to the cup body 200, and the inlet and the outlet cannot be directly communicated. After the water enters from the inlet, it needs to pass through the inside of the cup body 200, come into contact with the filtering structure with filtering ability for filtration, and then can flow out from the outlet.

[0049] Therefore, in this embodiment, the two ends of the cup body 200 are respectively sealed and connected to the inlet and outlet control valve 100 and the sewage discharge valve 300, and a filtering cavity is formed inside the inlet and outlet control valve 100 and the cup body 200, and the cartridge-changing assembly 400 is accommodated in the filtering cavity.

[0050] The filter element replacement assembly 400 includes an elastic member 410, a filter element 420, a water filter skeleton, and a limit end cap 450. Among them, the elastic member 410, the filter element 420, and the water filter skeleton form an integral filter element replacement unit. The limit end cap 450 is sealingly connected to the end of the water inlet and outlet control valve 100 away from the cup body 200. Relative rotation can occur between the integral filter element replacement unit and the limit end cap 450, so that the integral filter element replacement unit can be disengaged from the limit of the limit end cap 450, and the integral filter element replacement unit can be taken out of the filter chamber to clean or replace the filter element 420.

[0051] Specifically, the water filter skeleton includes a first water filter skeleton 430, a second water filter skeleton 440, an elastic member limiting portion 431, and a filter element replacement control portion 441.

[0052] Please refer to Figure 2 and Figure 3 , a plurality of water filter holes 460 are provided on both the first water filter skeleton 430 and the second water filter skeleton 440, and the plurality of water filter holes 460 are arranged in a uniformly spaced array, facilitating the passage of water flow.

[0053] Please refer to Figure 1 for cooperation. The first water filter skeleton 430 and the second water filter skeleton 440 are sealingly connected, and no water filter holes 460 are provided at the connection. And the connection is correspondingly arranged with the connection between the water inlet and outlet control valve 100 and the cup body 200. The first water filter skeleton 430 is accommodated in the cup body 200, the second water filter skeleton 440 is accommodated in the water inlet and outlet control valve 100, and the filter element 420 is arranged on the outer surface of the first water filter skeleton 430, covering the water filter holes 460 of the first water filter skeleton 430.

[0054] In this embodiment, the first water filter skeleton 430 and the second water filter skeleton 440 are of a split structure, and the two are sealingly connected by threads and a sealing ring 700. In other embodiments, the first water filter skeleton 430 and the second water filter skeleton 440 can be of an integrally formed structure, as long as no water filter holes 460 are provided at the connection between the first water filter skeleton 430 and the second water filter skeleton 440.

[0055] When water enters through the water inlet of the water inlet and outlet control valve 100, since the water inlet and the water outlet are not directly connected, therefore, the water will enter the filter chamber where the cup body 200 is located. After the water is filtered by the filter element 420, it enters the first water filter skeleton 430 through the water filter holes 460 of the first water filter skeleton 430.

[0056] Since the first water filtering framework 430 is accommodated within the cup body 200, the second water filtering framework 440 is accommodated within the water inlet and outlet control valve 100, and the connection between the first water filtering framework 430 and the second water filtering framework 440 is hermetically arranged with the connection between the water inlet and outlet control valve 100 and the cup body 200, therefore, water cannot flow externally between the first water filtering framework 430 and the second water filtering framework 440, and can only pass through the interiors of the first water filtering framework 430 and the second water filtering framework 440. This ensures that water must pass through at least one filter element 420, then flow from the interior of the first water filtering framework 430 into the interior of the second water filtering framework 440, and then pass through the water filtering holes 460 on the second water filtering framework 440 and flow out from the water outlet of the water inlet and outlet control valve 100, guaranteeing the smooth progress of the water filtering process.

[0057] Please refer to Figure 2 , an elastic member limiting portion 431 is provided on the end face of the end of the first water filtering framework 430 remote from the second water filtering framework 440. One end of the elastic member 410 is fixed on the elastic member limiting portion 431, and the opposite end extends towards the direction of the sewage valve 300.

[0058] The provision of the elastic member 410 can provide axial movement space for the overall filter element replacement, providing a basis for the removal of the overall filter element replacement.

[0059] Please refer to Figure 1 , in this embodiment, in order to facilitate the fixation of the elastic member 410 and the support of the overall filter element replacement, the pre-filter 10 further includes a connecting member 600. The connecting member 600 is a hollow cylindrical structure. The connecting member 600 connects the cup body 200 and the sewage valve 300, and the connections are all hermetically connected to prevent water seepage or leakage. One end of the elastic member 410 remote from the water filtering framework contacts the end face of the connecting member 600.

[0060] In this embodiment, an annular groove is provided on the end face of the connecting member 600. One end of the elastic member 410 remote from the first water filtering framework 430 is placed within the groove. In other embodiments, if the surface of the sewage valve 300 can place or fix the elastic member 410, the connecting member 600 may not be provided.

[0061] Please refer to Figure 3 , the end of the second water filtering framework 440 remote from the first water filtering framework 430 is a filter element replacement control portion 441. A first annular positioning area is provided on the cylindrical surface of the filter element replacement control portion 441. A first raised area and a first non-raised area 4413 are provided within the first annular positioning area.

[0062] Please refer to Figure 4 , a second annular positioning area is provided on the inner cylindrical surface of the limiting end cap 450. A second raised area and a second non-raised area 4514 are provided within the second annular positioning area.

[0063] The cartridge replacement control part 441 can be selectively rotated relative to the limit end cover 450 so that the first convex area contacts and positions with the second convex area, or so that the first convex area and the second convex area are arranged in a dislocation manner.

[0064] When the pre-filter 10 filters water normally, the whole cartridge is accommodated in the filter cavity, the first convex area contacts and positions with the second convex area, and the pre-filter 10 can filter water normally; when it is necessary to replace or clean the filter element 420, the cartridge replacement control part 441 rotates, the first convex area and the second convex area are arranged in a dislocation manner, and each convex on the first convex area can pass through the second non-convex area 4514 after rotation, so as to lift the whole cartridge as a whole, facilitating the replacement or cleaning of the filter element 420.

[0065] In this embodiment, the matching structure of the limit end cover 450 and the cartridge replacement control part 441 further includes the following content:

[0066] Please refer to Figure 5 and Figure 6 , a first convex part 4411 is arranged on the first convex area, and a first positioning part 4412 is arranged on the first convex part 4411.

[0067] A second convex part 4511 is arranged on the second convex area, and a second positioning part 4512 corresponding to the first positioning part 4412 is arranged on the second convex part 4511, and the first positioning part 4412 and the second positioning part 4512 can be selectively matched and positioned.

[0068] When the pre-filter 10 filters water normally, the first convex part 4411 and the second convex part 4511 contact, and the first positioning part 4412 and the second positioning part 4512 are matched and positioned to prevent the whole cartridge from rotating and coming out due to the vibration during the water filtration process. When it is necessary to replace or clean the filter element 420, the cartridge replacement control part 441 is pressed down, the elastic part 410 is compressed, the first positioning part 4412 and the second positioning part 4512 are disengaged from the positioning, and then the cartridge replacement control part 441 is rotated relative to the limit end cover 450, and each first convex part 4411 can pass through the second non-convex area 4514, so as to lift the whole cartridge as a whole, facilitating the replacement or cleaning of the filter element 420. By setting the first positioning part 4412 and the second positioning part 4512, the filtration process of the pre-filter 10 can be made more stable.

[0069] In this embodiment, there are two first convex parts 4411, which are symmetrically designed along the center of the cartridge replacement control part 441, and the length of each first convex part 4411 is less than or equal to 1 / 4 of the sector arc length of the outer ring surface of the cartridge replacement control part 441, so as to ensure that the whole cartridge can be easily taken out.

[0070] Similarly, there are also two second protrusions 4511, which are symmetrically designed along the center of the limit end cap 450. The length of each second protrusion 4511 is less than or equal to 1 / 4 of the arc length of the inner ring surface of the limit end cap 450, so as to ensure that the whole filter element can be easily taken out.

[0071] In this embodiment, in order to facilitate the user to confirm whether the whole filter element is rotated in place and avoid the phenomenon that only partial areas of the first protrusion 4411 and the second protrusion 4511 are in contact, a first protrusion limiting part 4513 extending in the direction of the first protrusion 4411 is further provided at one end of the second protrusion 4511. When the user rotates until the first protrusion 4411 is limited by the first protrusion limiting part 4513 and cannot rotate, it proves that the rotation is in place. At this time, with the positioning of the first positioning part 4412 and the second positioning part 4512, the filtering process of the pre-filter 10 is ensured to be safe, stable and effective.

[0072] In this embodiment, the first positioning part 4412 is an axial groove opened on the first protrusion 4411, and the second positioning part 4512 is an axial protrusion provided on the second protrusion 4511, so as to facilitate their cooperation in positioning.

[0073] In other embodiments, the first protrusion 4411 can also be a protrusion of multiple small squares or a fan-shaped protrusion of three or more, as long as it is ensured that the first protrusion 4411 and the second protrusion 4511 can be in contact for positioning and can be disengaged from the positioning after rotation. The same applies to the second protrusion 4511.

[0074] In addition, in this embodiment, there is only one row of first protrusions 4411 along the axial direction in the first annular positioning area. In other embodiments, multiple rows of first protrusions 4411 can also be provided along the axial direction in the first annular positioning area. The multiple rows of first protrusions 4411 can be arranged in an array or in a staggered manner, as long as it is ensured that the first protrusion 4411 and the second protrusion 4511 can be in contact for positioning and can be disengaged from the positioning after rotation. The same applies to the second protrusion 4511.

[0075] Please refer to Figure 3 , in this embodiment, an operation handle 4414 is further provided on the end face of the filter element control part 441 away from the second water filtering skeleton 440, which is convenient for the user to screw the filter element control part 441.

[0076] Please refer to Figure 1 , in this embodiment, the pre-filter 10 further includes a check valve 500. The check valve 500 is arranged in the water outlet of the water inlet and outlet control valve 100. The check valve 500 can prevent the water in the pipeline at the rear end from returning to the pre-filter 10 due to the pressure change inside the pre-filter 10 during the process of cleaning or replacing the filter element 420 as the whole filter element is taken out.

[0077] In this embodiment, a sealing connection is provided between the second water filtering framework 440 and the inner wall surface of the water inlet and outlet control valve 100.

[0078] In this embodiment, the elastic member 410 is a spring and the filtering member 420 is a filter net, and the specific structures can all adopt existing structural settings.

[0079] A pre-filter 10 with a cartridge-changing process that does not require disassembling the cup provided in this embodiment has the following working principle:

[0080] Assembly process of the pre-filter 10: Please refer to Figure 1 , hermetically connect the cup body 200, the connecting member 600, and the sewage discharge valve 300 in sequence from top to bottom; hermetically connect the first water filtering framework 430 and the second water filtering framework 440, then sleuth the filtering member 420 on the outer surface of the first filtering framework, sleuth the elastic member 410 on the elastic member limiting portion 431 of the first filtering framework to form an integral cartridge-changing unit, and then insert the integral cartridge-changing unit into the cup body 200 so that the first filtering framework and the filtering member 420 are both accommodated in the filtering cavity inside the cup body 200. One end of the elastic member 410 away from the first filtering framework contacts the end surface of the connecting member 600 and is accommodated in the groove on the end surface of the connecting member 600. The connection part between the first filtering framework and the second filtering framework just gets stuck at the opening of the cup body 200, and then sleuth the water inlet and outlet control valve 100 on the surface of the second filtering framework. The water inlet and outlet control valve 100 is hermetically connected to the cup body 200 respectively, and is also hermetically connected to the connection part between the first filtering framework and the second filtering framework; then cover the limiting end cap 450 on the top of the water inlet and outlet control valve 100 and hermetically connect it to the water inlet and outlet control valve 100, and the operating handle 4414 of the cartridge-changing control portion 441 extends out of the limiting end cap 450.

[0081] Water filtering process: Please refer to Figure 7 , the user applies a downward force to the operating handle 4414 and rotates it until it cannot be rotated further (the first protrusion portion 4411 is limited by the first protrusion limiting portion 4513), then withdraw the downward force applied to the operating handle 4414. The integral cartridge-changing unit moves upward along the axis under the control of the elastic member 410. The first protrusion portion 4411 contacts the second protrusion portion 4511, and the first positioning member 4412 cooperates with the second positioning member 4512 for positioning. The first protrusion limiting portion 4513 limits the first protrusion portion 4411 to ensure that the inside of the pre-filter 10 is completely sealed and the water filtering process can be carried out.

[0082] During the water filtering process, water enters from the water inlet of the water inlet and outlet control valve 100, passes through the filter net for filtering, then passes through the water filtering holes 460 on the first water filtering framework 430, enters the inside of the first water filtering framework 430, and then passes through the water filtering holes 460 of the second water filtering framework 440 and flows out from the water outlet of the water inlet and outlet control valve 100.

[0083] Sewage discharge process: Please refer to Figure 8 , by controlling the sewage discharge valve 300 to open and closing the valve in the water outlet direction of the water inlet and outlet control valve 100, sewage can enter the filter cavity in the cup body 200 from the water inlet, then pass through the channel inside the connector 600, and then be discharged through the sewage discharge valve 300.

[0084] Process of replacing or cleaning the filter element 420: Please refer to Figure 9 and Figure 10 , open the check valve 500 to prevent the water from the user side from flowing back to the pre-filter 10; close the household water inlet valve. First, the sewage discharge valve 300 can be opened to discharge the impurities in the pre-filter 10, and at the same time, the water stored in the pre-filter 10 is discharged to facilitate subsequent processing.

[0085] After the water in the pre-filter 10 is drained, the user applies a downward force to the operation handle 4414. The first protrusion 4411 and the second protrusion 4511 move away from each other, and the first positioning member 4412 and the second positioning member 4512 are disengaged from positioning. Then rotate the operation handle 4414 and turn it in the direction away from the first protrusion limit portion 4513 until the whole filter element replacement can be taken out from the filter cavity. The taken-out whole filter element replacement can confirm the treatment method according to the clogging degree of the filter element 420. If the filter element 420 is not severely clogged, it can be scrubbed with a brush. After scrubbing clean, the whole filter element replacement is plugged back into the filter cavity; if the filter element 420 is severely clogged, the filter element 420 can be directly removed, and a new filter element 420 is replaced to cover the first water filtering skeleton 430, and then the whole filter element replacement is plugged back into the filter cavity. After the whole filter element replacement is plugged back into the filter cavity, assemble it with reference to the assembly method in the water filtering process, then open the household water inlet valve and close the check valve 500 to conduct water filtering.

[0086] The above is only the preferred embodiment of the present utility model and is not used to limit the present utility model. For those skilled in the art, various changes and modifications can be made to the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A pre-filter that does not require removing the cup during the cartridge replacement process, characterized in that, It includes an inlet and outlet control valve, a cup body, a sewage discharge valve and a filter element replacement assembly; Both ends of the cup body are hermetically connected to the inlet and outlet control valve and the sewage discharge valve respectively, and a filtering cavity is formed inside the inlet and outlet control valve and the cup body, and the filter element replacement assembly is accommodated in the filtering cavity; The filter element replacement assembly includes an elastic member, a filter element, a water filtering skeleton and a limiting end cover; the limiting end cover is hermetically connected to one end of the inlet and outlet control valve away from the cup body; The water filtering skeleton includes a first water filtering skeleton, a second water filtering skeleton, an elastic member limiting part and a filter element replacement control part; A plurality of water filtering holes are provided on both the first water filtering skeleton and the second water filtering skeleton. The first water filtering skeleton and the second water filtering skeleton are hermetically connected, and no water filtering holes are provided at the connection part, and the connection part is correspondingly arranged with the connection part of the inlet and outlet control valve and the cup body. The first water filtering skeleton is accommodated in the cup body, and the second water filtering skeleton is accommodated in the inlet and outlet control valve; The filter element is arranged on the outer surface of the first water filtering skeleton, covering the water filtering holes of the first water filtering skeleton; An elastic member limiting part is arranged on the end face of one end of the first water filtering skeleton away from the second water filtering skeleton. One end of the elastic member is fixed on the elastic member limiting part, and the opposite end extends towards the sewage discharge valve; One end of the second water filtering skeleton away from the first water filtering skeleton is the filter element replacement control part. A first annular positioning area is arranged on the cylindrical surface of the filter element replacement control part, and a first raised area and a first non-raised area are arranged in the first annular positioning area; A second annular positioning area is arranged on the inner cylindrical surface of the limiting end cover, and a second raised area and a second non-raised area are arranged in the second annular positioning area; The filter element replacement control part can be selectively rotated relative to the limiting end cover so that the first raised area contacts and positions with the second raised area, or so that the first raised area and the second raised area are arranged in a dislocation manner.

2. The pre-filter according to claim 1, characterized in that, It further includes a check valve, and the check valve is arranged in the water outlet of the inlet and outlet control valve.

3. The pre-filter according to claim 1, characterized in that, It further includes a connecting piece. The connecting piece is a hollow cylindrical structure. The connecting piece connects the cup body and the sewage discharge valve, and one end of the elastic member away from the water filtering skeleton contacts the end face of the connecting piece.

4. The pre-filter according to claim 3, characterized in that, A groove is formed on the end face of the connecting piece, and the elastic member is placed in the groove.

5. The pre-filter according to claim 1, characterized in that, A first raised part is arranged on the first raised area, and a first positioning piece is arranged on the first raised part; A second raised part is arranged on the second raised area, and a second positioning piece corresponding to the first positioning piece is arranged on the second raised part. The first positioning piece and the second positioning piece can be selectively matched and positioned.

6. The pre-filter according to claim 5, wherein One end of the second raised part is further provided with a first raised limiting part extending towards the first raised part; 7. The pre-filter according to claim 5 or 6, characterized in that, The first positioning piece is an axial groove formed on the first raised part, and the second positioning piece is an axial protrusion arranged on the second raised part.

8. The pre-filter according to claim 1 or 5, characterized in that, An operation handle is further arranged on the end face of one end of the filter element replacement control part away from the second water filtering skeleton.

9. The pre-filter according to claim 1, wherein The second water filtering skeleton is hermetically connected to the inner wall surface of the inlet and outlet control valve.

10. The pre-filter according to claim 1, characterized in that, The first water filtration framework and the second water filtration framework are of a split structure.

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