Self-cleaning piston filter and filtering system

Abstract

The present invention discloses a self-cleaning piston filter and a filtering system, which relates to the technical field of water treatment. The self-cleaning piston filter comprises a filter tube, one end of which has a water inlet, the other end of which has a sewage outlet, a filter screen arranged on the side wall of the filter tube, the filter screen having a plurality of filter holes, the filter tube also being provided with a water outlet, the water outlet being communicated with the filter screen; and a piston assembly installed in the filter tube, the piston assembly comprising a cleaning piston, a first seat body and a first elastic member, the first seat body being fixed on the filter tube, one end of the first elastic member being pressed against the cleaning piston, the other end of the first elastic member being pressed against the first seat body, the cleaning piston comprising a scraping wall, the scraping wall being fitted with the filter screen, and the cleaning piston being provided with a pressure relief valve. The cleaning piston can effectively scrape off the oily residue on the filter screen, and effectively realize the self-cleaning of the filter screen.

Description

Technical Field

[0001] The invention relates to the technical field of water treatment, in particular to a self-cleaning piston filter and a filtering system. Background Art

[0002] In the process of realizing the present invention, the inventors found that there are at least the following problems in the prior art. At present, when cleaning the filter mesh on the market and the filter mesh is clogged, there are two ways to clean it: manual cleaning and electric cleaning. Both cannot achieve automatic cleaning. Manual cleaning filters generally require manual cleaning and are cleaned regularly. They are only cleaned when the user finds out and are easily forgotten, causing the filter mesh to be clogged. Long-term clogged filters will affect the filtering effect and even shorten the life of the filter mesh. Electric cleaning filters are relatively expensive and require additional sockets near the filter, making installation more complicated. Summary of the invention

[0003] The present invention aims to solve at least one of the above technical problems in the prior art to a certain extent. To this end, an embodiment of the present invention provides a self-cleaning piston filter that can automatically clean the filter holes by water pressure without manual or electric self-cleaning.

[0004] An embodiment of the present invention also provides a filtering system.

[0005] According to an embodiment of the first aspect of the present invention, there is provided a self-cleaning piston filter, comprising a filter tube, one end of the filter tube having a water inlet, the other end of the filter tube having a sewage outlet, a filter screen arranged on a side wall of the filter tube, the filter screen having a plurality of filter holes, the filter tube also being provided with a water outlet, the water outlet being connected to the filter screen; and a piston assembly installed in the filter tube, the piston assembly comprising a cleaning piston, a first seat body and a first elastic member, the first seat body being fixed on the filter tube, one end of the first elastic member being pressed against the cleaning piston, the other end of the first elastic member being pressed against the first seat body, the cleaning piston comprising a scraping wall, the scraping wall being in contact with the filter screen, and the cleaning piston being provided with a pressure relief valve.

[0006] The above self-cleaning piston filter has at least the following beneficial effects: by designing the piston assembly, if the filter holes on the filter net are blocked, the water pressure at the water inlet of the filter tube will increase, and push the cleaning piston to move toward the sewage outlet, and the other end of the cleaning piston provides corresponding support force through the first elastic member, and during the movement of the cleaning piston, more filter holes will be exposed for water to flow through, and when the water pressure increases to a certain pressure, the pressure relief valve installed on the cleaning piston opens, and thereafter, the cleaning piston resets toward the water inlet, and during the resetting process of the cleaning piston, the scraper wall that fits the filter net will scrape off the oily residue on the filter net, and the oily residue is discharged from the sewage outlet, and after the filter holes on the filter net are unblocked, the water flow at the water inlet flows to the water outlet, and when the pressure at the water inlet reaches equilibrium, the pressure relief valve closes. The present invention can effectively scrape off the oily residue on the filter net through the moving cleaning piston, and effectively realize the self-cleaning of the filter net.

[0007] According to an embodiment of the first aspect of the present invention, the cleaning piston also includes a piston body and a piston seat body, the piston body is arranged toward the water inlet, the piston body is provided with a drain hole, the scraper wall is located between the piston body and the piston seat body, and the pressure relief valve includes a drain plug and a second elastic member, the drain plug is pressed against the drain hole, one end of the second elastic member is pressed against the drain plug, and the other end of the second elastic member is pressed against one side of the piston seat body.

[0008] According to an embodiment of the first aspect of the present invention, a limit ring is arranged in the filter tube, and the limit ring and the first seat body are respectively arranged on both sides of the cleaning piston.

[0009] According to an embodiment of the first aspect of the present invention, the piston body is in a tapered tube shape, and the inner recess of the piston body is arranged toward the water inlet.

[0010] According to an embodiment of the first aspect of the present invention, the piston body and the scraper wall are integrally formed, and a scraper edge is formed between the piston body and the scraper wall.

[0011] According to an embodiment of the first aspect of the present invention, a first sealing ring is provided between the piston seat body and the scraper wall, and a second sealing ring is provided at the drain hole of the piston body.

[0012] According to an embodiment of the first aspect of the present invention, the piston seat body is hollow, and a first spring limiting ring for limiting radial movement of the first elastic member is provided on one side of the piston seat body, and a second spring limiting ring for limiting radial movement of the second elastic member is provided on the other side.

[0013] According to an embodiment of the first aspect of the present invention, an annular transition pipe section is provided in the middle of the filter tube, the filter screen is located in the transition pipe section, the water outlet is provided on the transition pipe section, and the water outlet is connected to a water outlet pipe.

[0014] According to an embodiment of the second aspect of the present invention, there is provided a filtration system, comprising the self-cleaning piston filter according to the embodiment of the first aspect of the present invention; and a water pool, wherein the upper portion of the water pool is connected to the water outlet via a pipe, the bottom of the water pool is connected to the water inlet via a pipe, the water outlet is provided with a water pump, and the sewage outlet is connected to a sewage pipe.

[0015] The above-mentioned filtration system has at least the following beneficial effects: sewage enters the self-cleaning piston filter from the pool for filtration, the filtered clean water is output from the outlet and transported back to the pool by the water pump to form a circulation system, and in addition, the filtered oil residue can be discharged from the sewage outlet.

[0016] According to an embodiment of the third aspect of the present invention, a filtration system is provided, comprising the self-cleaning piston filter described in the embodiment of the first aspect of the present invention, the water inlet being connected to a water inlet pipe, the sewage outlet being connected to a sewage pipe, the water inlet pipe being installed with a pressure-stabilizing valve, and the sewage pipe being installed with a check valve.

[0017] The above-mentioned filtering system has at least the following beneficial effects: water flows through the water inlet pipe into the self-cleaning piston filter for filtration, the filtered clean water is output from the water outlet for user use, and the filtered dirt particles are discharged from the sewage outlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly describes the drawings required for use in the description of the embodiments. Obviously, the drawings described are only part of the embodiments of the present invention, not all of the embodiments, and those skilled in the art can also obtain other design solutions and drawings based on these drawings without creative work.

[0019] Figure 1 It is a stereoscopic diagram of an embodiment of the first aspect of the present invention.

[0020] Figure 2 It is a perspective cutaway view of an embodiment of the second aspect of the present invention.

[0021] Figure 3 It is a cross-sectional view of an embodiment of the first aspect of the present invention.

[0022] Figure 4 It is a perspective cutaway view of the cleaning piston in the embodiment of the first aspect of the present invention.

[0023] Figure 5 It is a cross-sectional view of the filter tube in the embodiment of the first aspect of the present invention.

[0024] Figure 6 It is a structural schematic diagram of the initial state of an embodiment of the first aspect of the present invention.

[0025] Figure 7 It is a structural schematic diagram of the filtering state of an embodiment of the first aspect of the present invention.

[0026] Figure 8 It is a structural schematic diagram of the filtering state of the embodiment of the first aspect of the present invention, in which some of the filtering holes are blocked.

[0027] Fig. 9 It is a structural schematic diagram of the filtering state of the embodiment of the first aspect of the present invention, in which some of the filtering holes are blocked and the cleaning piston moves downward.

[0028] Fig.10 It is a structural schematic diagram of the filtering state of the embodiment of the first aspect of the present invention, wherein all the filtering holes are blocked.

[0029] Fig.11 It is a structural schematic diagram of the sewage discharge state of the embodiment of the first aspect of the present invention, in which the pressure relief valve is open.

[0030] Fig.12 It is a structural schematic diagram of the sewage discharge state of the embodiment of the first aspect of the present invention, wherein the cleaning piston is reset.

[0031] Fig.13 It is a schematic structural diagram of an embodiment of the second aspect of the present invention.

[0032] Fig.14 It is a schematic structural diagram of an embodiment of the third aspect of the present invention. DETAILED DESCRIPTION

[0033] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0034] In the description of the present invention, it should be understood that the description of orientation, such as the orientation or position relationship indicated by the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present invention 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 understood as a limitation of the present invention. In addition, if there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0035] In the description of the present invention, "several" means one or more, "multiple" means two or more, "greater than", "less than", "exceed" etc. are understood to not include the number, and "above", "below", "within" etc. are understood to include the number, unless otherwise clearly and specifically defined.

[0036] In the description of the present invention, unless otherwise clearly defined, words such as “set,” “arrange,” “install,” “connect,” “connected,” and “fixed” should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above words in the present invention based on the specific content of the technical solution.

[0037] In the description of the present invention, unless otherwise clearly defined, a first feature being "above" or "below" a second feature may mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Moreover, a first feature being "above" or "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below" or "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0038] Reference Figures 1 to 5 , a self-cleaning piston filter comprises a filter tube 10 and a piston assembly installed in the filter tube 10.

[0039] Among them, Figures 1 to 3 As shown, one end of the filter tube 10 has a water inlet 11, the other end of the filter tube 10 has a sewage outlet 12, and the filter tube 10 is also provided with a water outlet 13. Figure 5 A filter screen 14 is arranged on the side wall of the filter tube 10 . The filter screen 14 has a plurality of filter holes 15 . The water outlet 13 is connected to the filter screen 14 .

[0040] The piston assembly includes a cleaning piston 30, a first seat body 17 and a first elastic member 18. Specifically, the first seat body 17 is fixed on the filter tube 10, and the first seat body 17 is hollow. In this embodiment, the first elastic member 18 is a compression spring, such as Figure 2 and Figure 3 As shown, one end of the first elastic member 18 presses against the cleaning piston 30, and the other end of the first elastic member 18 presses against the first seat body 17. In addition, as a preferred embodiment, a limit ring 16 is arranged in the filter tube 10, and the limit ring 16 and the first seat body 17 are respectively arranged on both sides of the cleaning piston 30. The limit ring 16 of this embodiment can of course be replaced by a limit block structure, which can be referred to Figure 2 and Figure 3The limiting ring 16 serves to limit the movement of the cleaning piston 30 toward the water inlet 11 . Of course, after water flows into the water inlet 11 , the water pressure will limit the movement of the cleaning piston 30 even if the limiting ring 16 is not provided.

[0041] Combination Figure 4 The cleaning piston 30 includes a scraping wall 32 , the scraping wall 32 is in contact with the filter screen 14 , and the cleaning piston 30 is provided with a pressure relief valve 35 .

[0042] The water flows into the filter tube 10 from the water inlet 11, and is filtered through the filter screen 14, and then flows out from the water outlet 13. Preferably, an annular transition pipe section 21 is provided in the middle of the filter tube 10, the filter screen 14 is located in the transition pipe section 21, the water outlet 13 is provided on the transition pipe section 21, and the water outlet 13 is connected to the water outlet pipe 22. In this embodiment, the filter holes 15 are arranged in the middle of the filter tube 10 and are evenly distributed along the circumference of the filter tube 10, and are divided into multiple rows, and the annular transition pipe section 21 can make the water flow be filtered through the filter screen 14, and then be buffered and flow to the water outlet 13.

[0043] If the filter holes 15 on the filter screen 14 are clogged, the water pressure at the water inlet 11 of the filter tube 10 will increase and push the cleaning piston 30 to move toward the sewage outlet 12. The other end of the cleaning piston 30 provides corresponding supporting force through the first elastic member 18. During the movement of the cleaning piston 30, more filter holes 15 will be exposed for water to flow through. When the water pressure increases to a certain pressure, the pressure relief valve 35 installed on the cleaning piston 30 opens, and the water pressure on the side of the cleaning piston 30 toward the water inlet 11 gradually decreases. Thereafter, the cleaning piston 30 is reset toward the water inlet 11. During the resetting process of the cleaning piston 30, the scraper wall 32 in contact with the filter screen 14 will scrape off the oily residue on the filter screen 14, and the oily residue is discharged from the sewage outlet 12. After the filter holes 15 on the filter screen 14 are unblocked, the water flow at the water inlet 11 flows to the water outlet 13. When the pressure at the water inlet 11 reaches equilibrium, the pressure relief valve 35 is closed.

[0044] Specifically, the cleaning piston 30 further includes a piston body 31 and a piston seat body 33, and the scraping wall 32 is located between the piston body 31 and the piston seat body 33. A first sealing ring 34 is arranged between the piston seat body 33 and the scraping wall 32, the piston body 31 and the scraping wall 32 are integrally formed, a scraping blade 322 is formed between the piston body 31 and the scraping wall 32, and the piston body 31 is arranged toward the water inlet 11, the piston body 31 is in a conical tube shape, and the inner recess of the piston body 31 is arranged toward the water inlet 11. During the resetting process of the cleaning piston 30, reference can be made to Figure 3 , the cleaning piston 30 moves upward, and the annular scraper blade 322 can shovel away the dirt on the filter screen 14.

[0045] The piston body 31 is provided with a drain hole 311, and the pressure relief valve 35 includes a drain plug 352 and a second elastic member 351. The drain plug 352 is pressed against the drain hole 311, and the drain hole 311 of the piston body 31 is provided with a second sealing ring 312. One end of the second elastic member 351 is pressed against the drain plug 352, and the other end of the second elastic member 351 is pressed against one side of the piston seat body 33. In this embodiment, the second elastic member 351 is a compression spring, and of course a rubber member can be selected.

[0046] The piston seat body 33 is hollow, and a first spring limiting ring 331 for limiting the radial movement of the first elastic member 18 is provided on one side of the piston seat body 33, and a second spring limiting ring 332 for limiting the radial movement of the second elastic member 351 is provided on the other side. The second spring limiting ring 332 is provided with a through hole for the drain plug 352 to move.

[0047] Reference Figures 6 to 12 , presents the working principle process of the self-cleaning piston filter. Figure 6 The initial state is shown, at this time, no water is flowing into the water inlet 11; Figure 7 At this time, water flows into the filter tube 10 from the water inlet 11 and pushes the cleaning piston 30 downward, and the filter holes 15 on the upper part of the filter screen 14 are connected to the water inlet 11; after filtering for a period of time, the filter holes 15 on the upper part of the filter screen 14 are gradually blocked, such as Figure 8 At this time, the water flow pushes the cleaning piston 30 to continue to move downward, the filter holes 15 in the middle and lower parts of the filter screen 14 are gradually exposed, and the water inlet 11 and the water outlet 13 are connected, such as Fig. 9 and Fig.10 shown; reference Fig.11 , all the filter holes 15 on the filter screen 14 are blocked. At this time, the pressure above the cleaning piston 30 increases, and the pressure relief valve 35 opens, that is, the drain plug 352 moves downward, the second elastic member 351 is compressed, and the drain hole 311 is connected to the drain port 12; refer to Fig.12 , because the water inlet 11 is connected to the sewage outlet 12, the upper and lower pressures of the cleaning piston 30 are consistent. At this time, the cleaning piston 30 gradually resets. At this time, the scraper wall 32 that fits the filter screen 14 will scrape off the oil residue on the filter screen 14, and the oil residue will be discharged from the sewage outlet 12. The scraper blade 322 can make it easier to scrape off the dirt on the filter screen 14. When the filter hole 15 on the filter screen 14 is unblocked, the water flow from the water inlet 11 flows to the water outlet 13. When the pressure at the water inlet 11 reaches equilibrium, the pressure relief valve 35 is closed. At this time, the state can be referred to Figure 7 .

[0048] Furthermore, the set pressure of the pressure relief valve 35 is greater than the initial elastic force of the first elastic member 18, which can be understood as the initial elastic force of the second elastic force 351 being greater than the initial elastic force of the first elastic member 18, so that when the water pressure of the filter tube 10 increases, the cleaning piston 30 presses the first elastic member 18 downward first to act. The inlet water pressure is greater than the elastic force of the second elastic force 351 when the drain plug 352 is opened, so that when the water pressure in the filter tube 10 increases to the inlet water pressure, the drain plug 352 is smoothly opened to discharge oil residues, etc. Before the cleaning piston 30 descends to the lowest filter hole 15, the elastic force of the first elastic member 18 should be less than the elastic force of the second elastic force 351 when the drain plug 352 is opened, to ensure that all filter holes 15 in the filter tube 10 are fully utilized.

[0049] Reference Fig.13 The embodiment of the present invention also shows a filtering system, including the above-mentioned self-cleaning piston filter and a pool 41. The upper part of the pool 41 is connected to the water outlet 13 through a pipe, and the bottom of the pool 41 is connected to the water inlet 11 through a pipe. The water outlet 13 is provided with a water pump 42, and the sewage outlet 12 is connected to a sewage pipe 45. Further, the sewage pipe 45 is installed with a residue crusher 43. The filtering system can be used to filter the sewage in the pool 41. The sewage enters the self-cleaning piston filter from the pool for filtration. The filtered clean water is output from the water outlet and transported back to the pool 41 by the water pump 42 to form a circulation system. In addition, the filtered oil residue can be discharged from the sewage outlet and crushed by the residue crusher 43. The residue crusher 43 can preferably be a residue crusher currently used in the market for installation under the kitchen sink.

[0050] Reference Fig.14 The embodiment of the present invention also shows a filtering system, including the above-mentioned self-cleaning piston filter, the water inlet 11 is connected to the water inlet pipe 44, the sewage outlet 12 is connected to the sewage outlet 45, the water inlet pipe 44 is installed with a pressure stabilizing valve 46, and the sewage outlet 45 is installed with a check valve 47. Further, the sewage outlet 45 is installed with a residue crusher 43. The filtering system is used for rough filtration of tap water, the water flows through the water inlet pipe 44 into the self-cleaning piston filter for filtration, the filtered clean water is output from the water outlet for use by users, and the filtered dirt particles are discharged from the sewage outlet and crushed by the residue crusher 43.

[0051] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A self-cleaning piston filter, characterized in that: include A filter tube (10), wherein one end of the filter tube (10) has a water inlet (11), the other end of the filter tube (10) has a sewage outlet (12), a filter screen (14) is arranged on the side wall of the filter tube (10), the filter screen (14) has a plurality of filter holes (15), and the filter tube (10) is also provided with a water outlet (13), the water outlet (13) being in communication with the filter screen (14); and a piston assembly installed in the filter tube (10), the piston assembly comprising a cleaning piston (30), a first seat body (17) and a first elastic member (18), the first seat body (17) being fixed on the filter tube (10), one end of the first elastic member (18) being pressed against the cleaning piston (30), the other end of the first elastic member (18) being pressed against the first seat body (17), the cleaning piston (30) comprising a scraping wall (32), the scraping wall (32) being in contact with the filter screen (14), and the cleaning piston (30) being provided with a pressure relief valve (35); The cleaning piston (30) further comprises a piston body (31) and a piston seat body (33); the piston body (31) is arranged toward the water inlet (11); the piston body (31) is provided with a drain hole (311); the scraper wall (32) is located between the piston body (31) and the piston seat body (33); the pressure relief valve (35) comprises a drain plug (352) and a second elastic member (351); the drain plug (352) is pressed against the drain hole (311); one end of the second elastic member (351) is pressed against the drain plug (352); and the other end of the second elastic member (351) is pressed against one side of the piston seat body (33).

2. The self-cleaning piston filter according to claim 1, characterized in that: A limit ring (16) is arranged inside the filter tube (10), and the limit ring (16) and the first seat body (17) are respectively arranged on both sides of the cleaning piston (30).

3. The self-cleaning piston filter according to claim 1, characterized in that: The piston body (31) is in the shape of a cone tube, and the inner recess of the piston body (31) is arranged toward the water inlet (11).

4. The self-cleaning piston filter according to claim 1 or 3, characterized in that: The piston body (31) and the scraper wall (32) are integrally formed, and a scraper blade (322) is formed between the piston body (31) and the scraper wall (32).

5. The self-cleaning piston filter according to claim 1, characterized in that: A first sealing ring (34) is provided between the piston seat body (33) and the scraper wall (32), and a second sealing ring (312) is provided at the sewage discharge hole (311) of the piston body (31).

6. The self-cleaning piston filter according to claim 1 or 5, characterized in that: The piston seat body (33) is hollow, and a first spring limiting ring (331) for limiting the radial movement of the first elastic member (18) is arranged on one side of the piston seat body (33), and a second spring limiting ring (332) for limiting the radial movement of the second elastic member (351) is arranged on the other side.

7. The self-cleaning piston filter according to claim 1, characterized in that: An annular transition pipe section (21) is provided in the middle of the filter pipe (10), the filter screen (14) is located in the transition pipe section (21), the water outlet (13) is provided on the transition pipe section (21), and the water outlet (13) is connected to a water outlet pipe (22).

8. A filtering system, characterized in that: include The self-cleaning piston filter according to any one of claims 1 to 7; as well as A water pool (41), wherein the upper part of the water pool (41) is connected to the water outlet (13) through a pipeline, and the bottom of the water pool (41) is connected to the water inlet (11) through a pipeline, the water outlet (13) is provided with a water pump (42), and the sewage outlet (12) is connected to a sewage pipe (45).

9. A filtering system, characterized in that: The self-cleaning piston filter comprises the self-cleaning piston filter according to any one of claims 1 to 7, wherein the water inlet (11) is connected to a water inlet pipe (44), the sewage outlet (12) is connected to a sewage discharge pipe (45), the water inlet pipe (44) is installed with a pressure-stabilizing valve (46), and the sewage discharge pipe (45) is installed with a check valve (47).

Images