Pre-filter

Abstract

The pre-filter includes a filter bottle, a valve body fixedly connected to the filter bottle, a filter element arranged in the filter bottle, an inlet and outlet valve body arranged on the valve body, a valve core rotatably connected to the valve body, and a sewage discharge assembly; the valve core is provided with a first channel and a second channel; the inlet and outlet valve body has an inlet connector and an outlet connector, the inlet connector can selectively communicate with the first channel and the second channel of the valve core, wherein the inlet connector can communicate with the filter element through the first channel of the valve core, and can communicate with the valve body through the second channel of the valve core; the outlet connector is connected to the valve body; a through hole is provided on the bottom of the filter bottle, and the sewage discharge assembly is connected to the filter bottle for selectively blocking the through hole. The present invention can merge two water flows introduced by the inlet and outlet valve bodies into one water flow, and realize reverse flushing of the filter element, so as to realize effective cleaning of the filter element.

Description

Technical Field

[0001] The invention belongs to the technical field related to purification equipment, and in particular relates to a pre-filter. Background Art

[0002] The corrosion of long-distance water pipes and faucets will bring rust. The pre-filter is the first coarse filtration equipment for the water used in the whole house. It filters out granular impurities in the water, such as rust, sediment, particulate matter, suspended matter, asbestos fibers and other substances, and solves the secondary pollution caused by tap water in the process of water distribution in urban pipelines and rural groundwater turbidity. It is the nemesis of "red water", "black water", "yellow water", "scale" and other problems; the secondary water supply of the rooftop water tank leads to the breeding of microorganisms, and the pre-filter can effectively intercept "red worms" and other visible microorganisms; it is the nemesis of secondary pollution of tap water. The pre-filter is usually installed behind the water meter of the water inlet pipe and is used for centralized treatment of indoor water pipes. It can meet the water purification needs of the whole house water supply system such as kitchen water supply, electrical appliance water supply, and bathroom water supply.

[0003] At present, the existing pre-filters basically do not have the function of backwashing. Some of the pre-filters with backwashing function do not have multiple filtering functions. Since the filtering effect is determined by the filter screen, but the filter screen aperture accuracy is poor, the filtering effect is poor. None of the pre-filters with multiple filtering functions on the market have the backwashing function and do not achieve the change of the water flow direction. Its flushing function mainly relies on the backflow of filtered water, which is completely positive flushing and does not belong to backwashing. The corresponding reverse impact force is small and cannot achieve the actual effect. When the existing pre-filter is in use, when impurities are embedded in the filter mesh of the filter element, it is difficult to achieve a thorough cleaning of the filter element. If you want to clean it, you still need to cut off the pipeline and disassemble the filter element assembly, which is time-consuming and laborious. Summary of the invention

[0004] Based on this, it is necessary to provide a pre-filter to address the technical problems existing in the prior art.

[0005] Specifically, a pre-filter comprises a filter bottle, a valve body fixedly connected to the filter bottle, a filter element arranged in the filter bottle, an inlet and outlet valve body arranged on the valve body, a valve core rotatably connected to the valve body, and a sewage discharge assembly; a first channel and a second channel are provided on the valve core; the inlet and outlet valve body has an inlet connector and an outlet connector, and the inlet connector can selectively communicate with the first channel and the second channel of the valve core, wherein the inlet connector can communicate with the filter element through the first channel of the valve core, and can communicate with the valve body through the second channel of the valve core; the outlet connector is connected to the valve body; a through hole is provided on the bottom of the filter bottle, and the sewage discharge assembly is connected to the filter bottle for selectively blocking the through hole.

[0006] As a preferred solution of the present invention, the valve core includes a valve core body, a rotating shaft is arranged on the central axis of the valve core body, the rotating shaft extends outward relative to the valve body, and a knob is fixedly connected to the part of the rotating shaft extending from the valve body.

[0007] As a preferred embodiment of the present invention, a rotation limit portion is provided on the knob, and a limit matching portion is provided on the valve body. When the knob drives the valve core body to rotate, the first channel or the second channel on the valve core body can be switched to be connected to the water inlet joint of the water inlet and outlet valve body through the cooperation between the rotation limit portion and the limit matching portion.

[0008] As a preferred solution of the present invention, a first interface and a second interface are symmetrically provided on the outer peripheral wall of the valve core body, wherein the first interface is communicated with the first channel, and the second interface is communicated with the second channel.

[0009] As a preferred embodiment of the present invention, the pre-filter further comprises a valve core retaining ring, which is arranged between the valve core and the filter element and is used to push the valve core body of the valve core against the valve body.

[0010] As a preferred solution of the present invention, a valve core gasket is arranged between one side of the valve core body abutting against the valve body and the valve body.

[0011] As a preferred solution of the present invention, the valve core body is wrapped with a rubber layer, and the rubber layer and the valve body are assembled in a fitting manner.

[0012] As a preferred embodiment of the present invention, the bottom of the filter bottle is provided with a retaining ring for wrapping the through hole on the periphery of the through hole, and the filter element is arranged on the retaining ring and sealingly cooperates with the retaining ring; wherein a through groove is opened on the retaining ring, and the through groove is connected with the through hole.

[0013] As a preferred embodiment of the present invention, the sewage discharge assembly includes a filter bottle joint partially disposed in the retaining ring, a cavity bottom knob fixedly connected to the filter bottle joint, and a sewage discharge valve connected to the filter bottle joint; the filter element, the retaining ring and the filter bottle joint are connected in sequence, and the sewage discharge valve is used for opening and closing control; the cavity bottom knob can drive the filter bottle joint to rotate, so as to selectively block the through groove with the portion of the filter bottle joint extending into the retaining ring.

[0014] As a preferred embodiment of the present invention, the filter bottle connector includes a connector body and a sealing head arranged on the connector body, the sealing head is provided with a notch, the notch and the through groove are arranged one-to-one correspondingly, and the filter bottle connector and the filter bottle can be connected through the cooperation between the notch and the through groove.

[0015] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0016] The pre-filter provided by the present invention has a reasonable structure, so that when the pre-filter is working, the two water flows introduced by the inlet and outlet valve bodies can be merged into one water flow, and the filter element can be reversely flushed, and the impurities embedded in the filter element can be flushed out and discharged outwardly along with the water flow, thereby realizing effective cleaning of the filter element; at the same time, the pre-filter has a simple structure, is easy to operate, and has a low production cost, which further meets people's usage needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of a pre-filter provided in one embodiment of the present invention when it is in a normal filtering state.

[0018] Figure 2 This is a schematic structural diagram of a pre-filter provided in one embodiment of the present invention when it is in a forward flushing state.

[0019] Figure 3 This is a schematic structural diagram of a pre-filter provided in one embodiment of the present invention when it is in a backwash state.

[0020] Figure 4 A cross-sectional view of a pre-filter provided in accordance with one embodiment of the present invention.

[0021] Figure 5 for Figure 1 Schematic diagram of the structure of the filter bottle in the pre-filter from another perspective.

[0022] Figure 6 for Figure 1 Schematic diagram of the structure of the valve body in the pre-filter from another perspective.

[0023] Figure 7 for Figure 1 A cross-sectional view of the valve body in the pre-filter from another perspective.

[0024] Figure 8 for Figure 1 Schematic diagram of the structure of the filter element in the pre-filter from another perspective.

[0025] Fig. 9 for Figure 1 Schematic diagram of the structure of the valve core in the pre-filter from one perspective.

[0026] Fig.10 for Figure 1 Schematic diagram of the structure of the valve core in the pre-filter from another perspective.

[0027] Fig.11 for Figure 1A cross-sectional view of the valve core in the pre-filter from another angle.

[0028] Fig.12 for Figure 1 Schematic diagram of the structure of the knob in the pre-filter from another perspective.

[0029] Fig.13 for Figure 1 A cross-sectional view of the inlet and outlet valve body of the pre-filter from another perspective.

[0030] Fig.14 for Figure 1 Schematic diagram of the structure of the filter bottle connector in the pre-filter from another perspective.

[0031] Fig.15 for Figure 1 Schematic diagram of the structure of the pre-filter cavity bottom knob from another perspective.

[0032] Among them, 10, filter bottle; 11, through hole; 12, retaining ring; 121, through groove; 13, convex ring; 14, step matching part; 20, valve body; 21, valve cavity; 22, flow hole; 30, filter element; 31, water filtration channel; 40, valve core; 41, valve core body; 42, rotating shaft; 43, knob; 401, first channel; 402, second channel; 403, first interface; 404, second interface; 410, valve core retaining ring; 420, valve core gasket; 431, rotation limiter; 432, Limit matching part; 50, water inlet and outlet valve body; 51, water inlet joint; 52, water outlet joint; 53, connecting joint; 54, threaded sleeve; 60, sewage discharge assembly; 61, filter bottle joint; 62, cavity bottom knob; 63, sewage discharge valve; 611, joint body; 612, sealing head; 613, notch; 614, step; 621, mark; 101, first valve cavity; 102, second valve cavity; 201, first sealing ring; 202, second sealing ring; 203, sealing ring; 204, sealing gasket. DETAILED DESCRIPTION

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

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0035] See also Figure 4 A pre-filter provided in one embodiment of the present invention includes a filter bottle 10, a valve body 20 connected to the filter bottle 10, a filter element 30 arranged in the filter bottle 10, an inlet and outlet valve body 50 arranged on the valve body 20, a valve core 40, and a sewage discharge component 60.

[0036] In this embodiment, the filter bottle 10 and the valve body 20 are connected in a threaded manner, and a first sealing ring 201 is provided at the contact portion between the filter bottle 10 and the valve body 20 for assembling and sealing the filter bottle 10 and the valve body 20. The filter bottle 10 of this embodiment is made of a transparent material, and the filter element 30 can be directly observed through the filter bottle 10, so that the filter element 30 can be cleaned in time. A second valve chamber 102 is formed between the filter bottle 10 and the filter element 30.

[0037] In this embodiment, a through hole 11 is opened at the bottom of the filter bottle 10, and the sewage discharge assembly 60 is used to selectively block the through hole 11, so that when the pre-filter of this embodiment is used, sewage can be discharged to the outside through the through hole 11 on the filter bottle 10.

[0038] Please also read Figure 5 , a retaining ring 12 is arranged on the bottom of the filter bottle 10, and the retaining ring 12 is arranged to wrap the through hole 11, wherein the filter element 30 is against the retaining ring 12 and is sealed with the retaining ring 12. Preferably, a sealing gasket 204 is arranged between the retaining ring 12 and the filter element 30 to ensure the assembly seal between the retaining ring 12 and the filter element 30. The water in the filter element 30 can flow to the through hole 11 through the retaining ring 12. Among them, a through groove 121 is opened on the retaining ring 12, and the through groove 121 is connected with the through hole 11, so that when the through hole 11 is blocked, the water in the filter element 30 can flow to the second valve core 102 of the filter bottle 10 through the filter net of the filter element 30, and then flow to the through hole 11 through the through groove 121, so as to realize the filtering effect of the filter element 30.

[0039] The through groove 121 in this embodiment is arranged at the position where the retaining ring 12 is connected to the bottom of the filter bottle 10, that is, the water in the second valve chamber 102 of the filter bottle 10 can flow to the through hole 11 through the through groove 121 without obstruction. The dead water deposited at the bottom of the filter bottle 10 can flow smoothly from the through groove 121 to the through hole 11 under the flushing of the water flow and be discharged outward, so that the pre-filter can remove the dead water and achieve the purpose of effectively flushing the filter bottle 10, and the water for flushing the filter bottle 10 is introduced into the filter bottle 10 by the water obtained after filtering through the pre-filter, further ensuring the cleanliness of the filter bottle 10 when cleaning.

[0040] Please also read Figure 6 , Figure 7 The valve body 20 is formed with a first valve cavity 101 inwardly, and the first valve cavity 101 is connected to the second valve cavity 102.

[0041] In this embodiment, the valve body 20 is provided with a cavity shell 21, and the cavity shell 21 is used to communicate with the water inlet joint 51 of the water inlet and outlet valve body 50, wherein the cavity shell 21 is provided with a flow channel hole 22 at a portion adjacent to the portion connected to the valve body 20, and the valve core 40 is disposed in the cavity shell 21 and is arranged in close contact with the cavity shell 21. The water to be filtered introduced by the water inlet joint 51 of the water inlet and outlet valve body 50 can be directly introduced into the valve core 40, and then directly guided to the valve core 30 through the valve core 40, or guided to the first valve cavity 102 of the valve body 20 through the flow channel hole 22 on the cavity shell 21.

[0042] Please also read Figure 8 The filter element 30 of this embodiment is configured as a folded filter screen structure, and the filter element 30 has multiple layers of filter screens (not shown). In this embodiment, a water filtering channel 31 for water flow is opened in the middle of the filter element 30, wherein the water filtering channel 31 of the filter element 30 is used to communicate with the filter bottle connector 61.

[0043] In this embodiment, the valve core 40 is provided with a first channel 401 and a second channel 402, wherein the first channel 401 is used to connect the water inlet joint 51 on the water inlet and outlet valve body 50 with the water filter channel 31 of the filter element 30, and the second channel 401 is used to connect the water inlet joint 51 on the water inlet and outlet valve body 50 with the first valve chamber 101 of the valve body 20, and the first channel 401 and the second channel 402 on the valve core 40 can be selectively connected to the water inlet joint 51 on the water inlet and outlet valve body 50. That is, the valve core 40 on the pre-filter of this embodiment is rotatably connected to the valve body 20, and when the valve core 40 rotates in the valve body 20, the first channel 401 or the second channel 402 on the valve core 40 can be selectively connected to the water inlet joint 51 on the water inlet and outlet valve body 50.

[0044] Please also read Figure 9-11The valve core 40 of this embodiment includes a valve core body 41, on the central axis of which a shaft 42 is provided, and the shaft 42 partially extends outward relative to the valve body 20, wherein a knob 43 is fixedly connected to the portion of the shaft 42 extending out of the valve body 20; in this embodiment, the first channel 401 and the second channel 402 on the valve core 40 are provided on the valve core body 41. The pre-filter of this embodiment can be manually turned by turning the knob 43 to drive the valve core body 41 to rotate in the valve body 20, so as to select the first channel 401 or the second channel 402 on the valve core body 41 to communicate with the water inlet joint 51 on the water inlet and outlet valve body 50.

[0045] In this embodiment, the first interface 403 and the second interface 404 are symmetrically provided on the outer peripheral wall of the valve core body 41, wherein the first interface 403 is connected to the first channel 401, and the second interface 404 is connected to the second channel 402. That is to say, the switching of the first channel 401 and the second channel 402 on the valve core body 41 of this embodiment to be connected to the water inlet joint 51 on the water inlet and outlet valve body 50 can be achieved by driving the valve core body 41 to rotate 180°. It can be understood that the positional relationship between the first interface 41 and the second interface 42 on the outer peripheral wall of the valve core body 41 is not limited to that shown in the figure, and those skilled in the art can open the first interface 41 and the second interface 42 at any position of the outer peripheral wall of the valve core body 41 according to the needs of use.

[0046] Please also read Figure 7 , Fig.12 In the valve core 40 of this embodiment, a rotation limit portion 431 is provided on the knob 43, and a limit matching portion 432 is provided on the valve body 20. The knob 43 can drive the valve core body 41 to rotate through the cooperation between the rotation limit portion 431 and the limit matching portion 432, so as to switch the conduction between the first channel 401 or the second channel 402 on the valve core body 41 and the water inlet joint 51 of the inlet and outlet valve body 50, so as to ensure the accuracy of the knob 43 in adjusting the position of the valve core body 41, and thus facilitate the switching adjustment of the first channel 401 and the second channel 402 on the valve core body 41.

[0047] Specifically, the rotation limiting portion 431 is configured as a semicircular baffle, and the limiting matching portion 432 is configured as a boss. When the semicircular baffle rotates with the knob 43, the rotation angle of the rotation 43 on the valve body 20 can be limited by the collision between the semicircular baffle and the boss. It can be understood that the rotation limiting portion 431 and the limiting matching portion 432 are not limited to being configured as shown in the figure. Those skilled in the art can configure the rotation limiting portion 431 as a boss and the limiting matching portion 432 as a semicircular baffle according to the needs of use.

[0048] In this embodiment, the pre-filter of this embodiment also includes a valve core retaining ring 410, which is arranged between the valve core 40 and the filter element 30, and is respectively connected to the first channel 401 of the valve core 40 and the filter channel 31 of the filter element 30, so that the water to be filtered introduced by the first channel 401 of the valve core 40 can pass through the valve core retaining ring 410 and enter the water filtration channel 31 of the filter element 30. Among them, the valve core retaining ring 410 can push the valve core body 41 against the valve body 20 to increase the pressure when the valve core body 41 contacts the valve body 20, thereby increasing the static friction formed when the valve core body 41 and the valve body 20 contact each other, so that the valve core body 41 will not be displaced under the impact of the water flow in the first valve chamber 101 of the valve body 20, which has the effect of improving the working stability of the pre-filter; at the same time, the valve core retaining ring 410 pushes the valve core body 41 to press on the valve body 20, and can also play a role in improving the sealing of the valve core body 41 and the valve body 20 when they are assembled with each other.

[0049] Furthermore, a valve core gasket 420 is arranged between the valve core body 41 and the valve body 20, and the valve core gasket 420 can be used to assemble and seal the valve core body 41 and the valve body 20. The structure of the valve core gasket 420 can also improve the static friction formed when the valve core body 41 and the valve core gasket 420 contact when the valve core retaining ring 410 pushes the valve core body 41, thereby ensuring the valve core body 41 can resist the impact of water flow. Among them, at least one second sealing ring 202 is sleeved on the rotating shaft 42, and the second sealing ring 202 is in abutment with the valve body 20 to ensure the assembly seal between the valve core 40 and the valve body 20, thereby ensuring the sealing of the pre-filter as a whole.

[0050] In this embodiment, the valve core 40 is injection molded of a plastic material, and the semi-finished product obtained after injection molding is wrapped with a rubber layer (not shown in the figure), and the final valve core 40 is obtained. The rubber layer of the valve core 40 and the valve body 20 are assembled in an interference fit manner, so as to improve the self-locking ability of the valve core 40. At the same time, the valve core retaining ring 410 is used to appropriately tighten the valve core 40, and finally achieve a suitable self-locking force of the valve core 40, so that the valve core 40 does not shift under the impact of the water flow in the pipeline, and the knob 43 has a suitable switch feel. It is understandable that it should be noted that the cooperation between the valve core 40 and the valve body 20 is not limited to that shown above, and those skilled in the art can set the valve core 40 and the valve body 20 to a clearance fit according to the requirements of use, wherein the gap between the valve core 40 and the valve body 20 is less than or equal to the mesh diameter of the filter screen on the filter element 30 in the pre-filter, thereby ensuring that the pre-filter filters the water introduced by the water inlet joint 51 of the inlet and outlet valve body 50 when working.

[0051] The water inlet and outlet valve body 50 is used to connect with an external pipeline. Fig.13 , wherein the water inlet and outlet valve body 50 has a water inlet joint 51 and a water outlet joint 52, wherein the water inlet joint 51 can be communicated with the filter element 30 through the valve body 20 and the valve core 40, and the water outlet joint 52 is communicated with the valve body 20. That is to say, when the pre-filter of this embodiment is working, the water to be filtered introduced by the water inlet joint 51 of the water inlet and outlet valve body 50 can enter the water filtering channel 31 of the filter element 30 under the guidance of the first channel 401 of the valve core 40, and the water to be filtered placed in the water filtering channel 31 of the filter element 30 can pass through the filter net of the filter element 30 and enter the second valve cavity 102, and then be discharged outward from the water outlet joint 52 through the first valve cavity 101, thereby realizing the filtering operation of the pre-filter on the water to be filtered.

[0052] In this embodiment, the water inlet and outlet valve body 50 is configured as a universal joint structure, so that when the water inlet and outlet valve body 50 is assembled on the valve body 20, the water inlet and outlet valve body 50 can be rotated at any angle on the valve body 20, so as to facilitate the assembly of the pre-filter on the pipeline. Among them, the water inlet joint 51 and the water outlet joint 52 of the water inlet and outlet valve body 50 are arranged on two opposite sides of the water inlet and outlet valve body 50, and the central axis of the water inlet joint 51 and the central axis of the water outlet joint 52 are respectively arranged perpendicular to the central axis of the valve body 20.

[0053] Specifically, the connecting joint 53 on the water inlet and outlet valve body 50 for connecting to the valve body 20 is assembled and connected to the valve body 20 in a threaded manner, and then the connecting joint 53 on the water inlet and outlet valve body 50 is locked on the valve body 20 using a threaded sleeve 54, thereby realizing the assembly connection between the water inlet and outlet valve body 50 and the valve body 20.

[0054] In this embodiment, the sewage discharge assembly 60 is connected to the filter bottle 10 , and the sewage discharge assembly 60 can selectively block the through hole 11 and the through groove 121 , respectively.

[0055] Specifically, the sewage discharge assembly 60 of this embodiment includes a filter bottle joint 61 partially provided in the retaining ring 12, a cavity bottom knob 62 connected to the filter bottle joint 61, and a sewage discharge valve 63 connected to the filter bottle joint 61; the filter element 30, the retaining ring 12 and the filter bottle joint 61 are connected in sequence, and the sewage discharge valve 63 is used for opening and closing control, that is, the sewage discharge valve 63 is used in this embodiment to control the opening and closing of the through hole 11 of the filter bottle 10, and the filter bottle joint 61 is used to control the opening and closing of the through groove 121 of the retaining ring 12.

[0056] Among them, the part of the filter bottle connector 61 extending into the retaining ring 12 is in contact with the inner wall of the retaining ring 12, and the part of the filter bottle connector 61 in contact with the inner wall of the retaining ring 12 can be used to block or unblock the through groove 121 on the retaining ring 12.

[0057] In this embodiment, a convex ring 13 for wrapping the through hole 11 is provided on the outer end surface of the bottom of the filter bottle 10, and the filter bottle joint 61 is attached to the convex ring 13, wherein a sealing ring 203 is provided between the filter bottle joint 61 and the convex ring 13, thereby realizing the assembly seal between the filter bottle joint 61 and the filter bottle 10.

[0058] Furthermore, the filter bottle 10, the retaining ring 12 and the convex ring 13 are configured as an integrated structure.

[0059] Please join us Fig.14The filter bottle connector 61 of this embodiment includes a connector body 611 and a sealing head 612 arranged on the connector body 611, wherein the sealing head 612 is provided with a notch 613, and the notch 613 is arranged in a one-to-one correspondence with the through groove 121, and the filter bottle connector 61 and the filter bottle 10 are connected through the cooperation between the through groove 121 and the notch 613. That is to say, the sealing head 612 on the filter bottle joint 61 is arranged to fit the inner wall of the retaining ring 12, and when the sealing head 612 is arranged to fit the inner wall of the retaining ring 12 and rotates, when the notch 613 on the sealing head 612 is arranged to correspond to the through groove 121 of the retaining ring 12, the notch 613 is communicated with the through groove 121, so that the filter bottle joint 61 releases the blockage of the through groove 121, so that the water in the second valve cavity 102 on the filter bottle 10 can flow to the filter bottle joint 61 through the through groove 121, and finally be discharged outward through the drain valve 63; on the contrary, when other parts of the sealing head 612 are arranged to correspond to the through groove 121 of the retaining ring 12, the sealing head 612 can block the through groove 121, so that the water in the second valve cavity 102 on the filter bottle 10 cannot be discharged outward through the filter bottle joint 61.

[0060] Among them, a step 614 is formed at the connecting portion of the joint body 611 and the sealing head 612, a step matching portion 14 is provided on the filter bottle 10, and the filter bottle joint 61 and the filter bottle 10 are assembled and connected through the matching between the step 614 and the step matching portion 14.

[0061] In this embodiment, the number of the through slots 121 and the notch 613 is set to two, and the two through slots 121 and the two notches 613 are symmetrically arranged at 180 degrees, which has the function of providing the sewage discharge flow of the filter bottle 10. It can be understood that the number of the through slots 121 and the notch 613 is not limited to that shown in the figure, and those skilled in the art can set the number of the through slots 121 and the notch 613 to 1, three, or even more according to the needs of use, or set the number of the through slots 121 and the number of the notches 613 to be different.

[0062] The cavity bottom knob 62 can drive the filter bottle connector 61 to rotate, so as to selectively block the through slot 121 with the portion of the filter bottle connector 61 extending into the retaining ring 12. The pre-filter of this embodiment can control the blocking or unblocking of the through slot 121 by rotating the cavity bottom knob 62.

[0063] In this embodiment, the cavity bottom knob 62 is sleeved on the convex ring 13, wherein the cavity bottom knob 62 is arranged on the joint body 611 of the filter bottle joint 61 and is connected and fixed to the joint body 611, so that when a person manually turns the cavity bottom knob 62, the cavity bottom knob 62 can drive the filter bottle joint 61 to rotate, thereby realizing the selective blocking of the through groove 121 by the filter bottle joint 61.

[0064] Please also read Fig.15 , a mark 621 is provided on the outer peripheral wall of the cavity bottom knob 62, and a mark matching portion (not shown) is provided on the filter bottle 10, and the cavity bottom knob 62 can drive the filter bottle connector 61 to rotate according to the matching between the mark 621 and the mark matching portion, so as to drive the filter bottle connector 61 to block or unblock the through slot 121. In other words, when people adjust the cavity bottom knob 62 according to the matching between the mark 621 and the mark matching portion, the accuracy of the cavity bottom knob 62 in adjusting the position of the filter bottle connector 61 is ensured, thereby facilitating the selective blocking control of the through slot 121.

[0065] Specifically, the mark 621 is set as a convex rib fixed on the cavity bottom knob 62, and the convex rib is specifically set to two different structures according to the size of the width, and the marking matching part is set to an marking arrow fixed on the filter bottle 10. When the marking arrow indicates a convex rib of one structure, it corresponds to the blocking or conduction of the through groove 121 by the filter bottle connector 61.

[0066] The drain valve 63 is connected to the filter bottle joint 61 and is used to control the opening and closing of the filter bottle joint 61, so as to realize the drain control of the pre-filter. In this embodiment, the drain valve 63 is configured as a ball valve, and the inlet connecting pipe part of the ball valve is connected and fixed to the joint body 611 of the filter bottle joint 61 in a threaded manner.

[0067] As can be seen from the above, in addition to having the normal water filtering function, the pre-filter of this embodiment can also flush the filter element 30 in and out to remove impurities on the filter element 30, thereby realizing the function of the filter element 30 on the pre-filter not requiring disassembly and cleaning. When flushing, the pre-filter can drive the water in the filter bottle 10 to be discharged outward along the drain valve 63, thereby removing the dead water at the bottom of the filter bottle 10, achieving the purpose of effectively flushing the filter bottle 10, and having the function of restoring healthy water.

[0068] Please also read Figure 1When the first channel 401 of the valve core 40 in the pre-filter of this embodiment is connected to the water inlet connector 51 of the water inlet and outlet valve body 50, the filter bottle connector 61 blocks the through groove 121, and the drain valve 63 is closed. The water to be filtered introduced by the water inlet joint 51 of the water inlet and outlet valve body 50 can enter the water filtration channel 31 of the filter element 40 through the first channel 401 of the valve core 40. The water in the water filtration channel 31 of the filter element 30 is closed by the drain valve 63 because the channel for outward discharge is closed, and can only flow to the second valve chamber 102 of the filter bottle 10 through the filter net of the filter element 30. In this process, impurities contained in the water to be filtered can be precipitated and retained on the filter net of the filter element 30, and the filtered water obtained in the second valve chamber 102 of the filter bottle 10 can flow to the first valve chamber 101 of the valve body 20, and finally be discharged outward through the water outlet joint 52 of the water inlet and outlet valve body 50, thereby realizing the filtering effect of the pre-filter on water.

[0069] Please also read Figure 2When the first channel 401 of the valve core 40 in the pre-filter of this embodiment is connected to the water inlet joint 51 of the water inlet and outlet valve body 50, the filter bottle joint 61 releases the blockage of the through groove 121, and the drain valve 63 is opened. The water to be filtered introduced by the water inlet joint 51 of the water inlet and outlet valve body 50 passes through the first channel 401 of the valve core 40 to enter the water filter channel 31 of the filter element 30, passes through the filter bottle joint 61, and finally is discharged outward through the drain valve 63. At the same time, the water outlet joint 52 of the water inlet and outlet valve body 50 also introduces the filtered water, passes through the first valve cavity 101, the second valve cavity 102, the through groove 121, and then enters the filter bottle joint 61, and finally passes through the drain valve 63. 3 is discharged outwards. During this process, water flows through both the inner and outer sides of the filter element 30, thereby realizing positive flushing of impurities deposited on the filter element 30, which can effectively flush the impurities on the filter element 30, so that the filter element 30 has the function of not requiring disassembly and washing; and the dead water at the bottom of the filter bottle 10 will also follow the filtered water to be discharged outwards through the through groove 121, so that when the pre-filter is used, the dead water at the bottom of the filter bottle 10 can be removed, and the filter bottle 10 can be effectively flushed to restore the function of healthy and good water. At the same time, the water in the filter bottle 10 can also be moved and discharged outwards along the sewage valve 63, that is, the pre-filter of this embodiment realizes that the water in the filter bottle 10 is running water and restores the function of healthy and good water. It can be understood that it should be noted that when people use the pre-filter, they connect the first channel 401 of the valve core 40 with the water inlet connector 51 of the water inlet and outlet valve body 50, and open the drain valve 63 first to achieve effective flushing of the filter element 30. Then, according to the needs of use, they choose to release the blockage of the through groove 121 by the filter bottle connector 61, so as to achieve effective flushing of impurities deposited on the filter element 30 when the pre-filter is working, and effectively remove dead water in the filter bottle 10.

[0070] Please also read Figure 3When the second channel 402 of the valve core 40 in the pre-filter of this embodiment is connected to the water inlet joint 51 of the water inlet and outlet valve body 50, the filter bottle joint 61 releases the blockage of the through groove 121, and the drain valve 63 is opened. The water to be filtered introduced by the water inlet joint 51 of the water inlet and outlet valve body 50 enters the first valve cavity 101 of the valve body 20 through the second channel 402 of the valve core 40. At the same time, the water outlet joint 52 of the water inlet and outlet valve body 50 also introduces the filtered water into the first valve cavity 101. The two water flows merge into one water flow, and enter the filter bottle joint 61 after passing through the second valve cavity 102 and the through groove 121, and finally discharged outward through the drain valve 63, thereby realizing the reverse flushing of the filter element 30. Washing, wherein the merged water flow can enter the water filtration channel 31 of the filter element 30 from the outside of the filter screen on the filter element 30 inward, and the impurities embedded in the filter screen on the filter element 30 can be washed away by the reverse running water flow, thereby ensuring that the impurities on the filter element 30 are effectively flushed when the pre-filter is working, so that the filter element 30 has the function of not needing to be disassembled and washed; and the dead water at the bottom of the filter bottle 10 will also be discharged outward along with the filtered water, so that when the pre-filter is in use, it can remove the dead water at the bottom of the filter bottle 10.

[0071] Furthermore, when the second channel 402 of the valve core 40 in the pre-filter of this embodiment is connected to the water inlet joint 51 of the water inlet and outlet valve body 50, the filter bottle joint 61 blocks the through groove 121, and the drain valve 63 is opened. The water introduced by the water inlet joint 51 and the water outlet joint 52 of the water inlet and outlet valve body 50 can merge into one water flow, and then pass through the filter screen of the filter element 30 in the reverse direction to enter the filter channel of the filter element 30, and finally be discharged outward through the filter bottle joint 61, so as to effectively flush the impurities embedded in the filter screen on the filter element 30.

[0072] In summary, the pre-filter provided by the present invention, through a reasonable structural setting, enables the pre-filter to achieve full movement of water in the filter bottle and discharge it outwards, which can not only clean the impurities on the filter element, but also the dead water on the bottom of the filter bottle can be discharged outwards along with the water in the filter bottle, and has the function of removing the dead water at the bottom of the filter bottle, thereby avoiding secondary pollution; at the same time, the pre-filter uses the filtered water to rinse the dead water at the bottom of the filter bottle, further ensuring the cleanliness of the filter bottle of the pre-filter, and can effectively prevent the growth of bacteria at the bottom of the filter bottle.

[0073] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0074] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A pre-filter, characterized in that : It includes a filter bottle, a valve body connected to the filter bottle, a filter element arranged in the filter bottle, an inlet and outlet valve body arranged on the valve body, a valve core rotatably connected to the valve body, and a sewage discharge assembly; the valve core is provided with a first channel and a second channel; the inlet and outlet valve body has an inlet joint and an outlet joint, the inlet joint can selectively communicate with the first channel and the second channel of the valve core, wherein the inlet joint can communicate with the filter element through the first channel of the valve core, and can communicate with the valve body through the second channel of the valve core; the outlet joint is communicated with the valve body; a through hole is provided on the bottom of the filter bottle, and the sewage discharge assembly is connected to the filter bottle for selectively blocking the through hole; The valve core comprises a valve core body, the first channel and the second channel are arranged on the valve core body, a rotating shaft is arranged on the central axis of the valve core body, the rotating shaft extends outward relative to the valve body part, wherein a knob is fixedly connected to the part of the rotating shaft extending out of the valve body; a first interface and a second interface are symmetrically provided on the outer peripheral wall of the valve core body, wherein the first interface is communicated with the first channel, and the second interface is communicated with the second channel; and the switching of the first channel and the second channel on the valve core body to be connected with the water inlet joint on the water inlet and outlet valve body can be realized by driving the valve core body to rotate 180°; The knob is provided with a rotation limit portion, and the valve body is provided with a limit matching portion. The knob can drive the valve core body to rotate through the cooperation between the rotation limit portion and the limit matching portion, so as to switch the conduction between the first channel or the second channel on the valve core body and the water inlet joint of the water inlet and outlet valve body; The rotation limiting portion is configured as a semicircular baffle, and the limiting matching portion is configured as a boss. When the semicircular baffle rotates with the knob, the rotation angle of the rotation on the valve body can be limited by the collision between the semicircular baffle and the boss. The pre-filter further comprises a valve core retaining ring, which is arranged between the valve core and the filter element and is used to push the valve core body of the valve core against the valve body.

2. The pre-filter according to claim 1, characterized in that: The valve core main body abuts against one side of the valve body, and a valve core gasket is arranged between the valve body.

3. The pre-filter according to claim 1, characterized in that: The valve core body is wrapped with a rubber layer, and the rubber layer is assembled with the valve body in a fitting manner.

4. The pre-filter according to claim 1, characterized in that: The bottom of the filter bottle is provided with a retaining ring for wrapping the through hole at the periphery of the through hole, and the filter element is arranged on the retaining ring and seals with the retaining ring; wherein a through groove is opened on the retaining ring, and the through groove is connected with the through hole.

5. The pre-filter according to claim 4, characterized in that: The sewage discharge assembly includes a filter bottle joint partially disposed in the retaining ring, a cavity bottom knob fixedly connected to the filter bottle joint, and a sewage discharge valve connected to the filter bottle joint; the filter element, the retaining ring and the filter bottle joint are connected in sequence, and the sewage discharge valve is used for opening and closing control; the cavity bottom knob can drive the filter bottle joint to rotate, so as to selectively block the through groove with the portion of the filter bottle joint extending into the retaining ring.

6. The pre-filter according to claim 5, characterized in that: The filter bottle connector includes a connector body and a sealing head arranged on the connector body, the sealing head is provided with a notch, the notch and the through groove are arranged in a one-to-one correspondence, and the filter bottle connector and the filter bottle can be connected through the cooperation between the notch and the through groove.

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