Shallow sand filter capable of reducing backwashing

Abstract

The invention relates to the field of shallow-layer sand filters, in particular to a shallow-layer sand filter capable of reducing reverse cleaning, which comprises a shell, a water inlet, a water outlet, a filter element and a filter element, the sand filtering assembly is located in the middle of the cavity of the shell; the water collecting assembly is located below the sand filtering assembly and used for collecting filtered clear water; the coarse filtering assembly is positioned above the sand filtering assembly in the cavity of the shell, so that the sewage is subjected to secondary filtering by the sand filtering assembly after being subjected to coarse filtering; the coarse filtering assembly comprises a mounting rod for providing a supporting position and a filtering part for providing a coarse filtering function, the mounting rod is connected with the inner wall of the shell, the upper part of the filtering part is sleeved on the mounting rod, and the mounting rod comprises a middle rod in the middle, a left rod and a right rod, the invention provides a shallow sand filter capable of reducing reverse cleaning. The reverse cleaning frequency of the shallow sand filter is reduced.

Description

Technical Field

[0001] The invention relates to the field of shallow sand filters, in particular to a shallow sand filter capable of reducing backwashing. Background Art

[0002] Shallow sand filter is a commonly used filtering device used to filter sewage. The filtered impurities remain in the filter sand component of the shallow sand filter, and the filtered water is called clean water.

[0003] With the long-term use of shallow sand filters, more and more impurities are found in the filter sand components, and the flux of the shallow sand filters continues to decrease. It is necessary to regularly use clean water to backwash the shallow sand filters to flush out the impurities in the shallow sand filters. There is a technical problem that the shallow sand filters need to be backwashed many times, and it is urgent to design a shallow sand filter that reduces backwashing.

[0004] It should be noted that the above information disclosed in this Background section is only for understanding the background technology of the present application concept, and therefore, it may contain information that does not constitute prior art. Summary of the Invention

[0005] The purpose of the present invention is to provide a shallow sand filter with reduced backwashing to solve the above problems.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A shallow sand filter with reduced backwashing, comprising:

[0008] a housing comprising a water inlet and a water outlet;

[0009] A filter sand assembly is located in the middle of the housing cavity;

[0010] A water collection component is located below the filter sand component and is used to collect filtered clean water;

[0011] The coarse filter assembly is located above the filter sand assembly in the housing cavity, so that the sewage is filtered for the second time by the filter sand assembly after the coarse filtration;

[0012] The coarse filtering assembly includes a mounting rod providing a support position and a filtering component providing a coarse filtering function. The mounting rod is connected to the inner wall of the shell, and the upper part of the filtering component is sleeved on the mounting rod.

[0013] In an optional embodiment, the mounting rod includes an intermediate rod in the middle and left and right rods with inclined ends, and the left and right rods are fixedly connected to the inner wall of the housing so that the coarse filter assembly is suitable for sliding on the left and right rods to the intermediate rod;

[0014] The filtering component includes an upper cover movably sleeved on the mounting rod, and the upper cover is close to the water inlet.

[0015] In an alternative embodiment, the cross-sections of the middle rod, the left rod, and the right rod are all circular;

[0016] The upper cover includes a mounting ring adapted to sleeve the mounting rod.

[0017] In an alternative embodiment, the mounting ring is made of a rigid material;

[0018] A through hole serving as a sewage channel is formed in the middle of the upper cover.

[0019] In an alternative embodiment, the lower part of the filtering component further includes a filter element adapted to roughly filter the sewage;

[0020] The filter element is snap-connected to the upper cover so that the filter element automatically falls off after the flux decreases, and adjacent filter elements can replace each other to reach directly below the water inlet.

[0021] In an alternative embodiment, the filter element is sleeved on the inclined left rod or right rod so that the filter element reaches directly below the through hole under the action of gravity;

[0022] The filter element includes an insertion part;

[0023] A clamping groove adapted to be snap-connected to the insertion part is arranged on the upper cover facing the filter element.

[0024] In an alternative embodiment, uniformly distributed protrusions adapted to contact the side wall of the clamping groove are arranged on the side surface of the insertion part;

[0025] The insertion part is made of a flexible material so that after the flux is small, the filter element is adapted to drive the insertion part to leave the clamping groove under the impact of sewage, so that adjacent rough filtering components slide to the middle rod and push the upper cover that has left the clamping groove away.

[0026] In an alternative embodiment, the filter element further includes a torsion spring and a filtering part;

[0027] The filtering part is connected to the end of the insertion part through a connecting shaft, and a cavity is arranged on the filtering part;

[0028] The connecting shaft penetrates through the torsion spring so that after the insertion part is separated from the clamping groove, the torsion spring is adapted to drive the insertion part to block the cavity of the filtering part.

[0029] In an alternative embodiment, filter meshes are arranged on both the bottom and the side of the filtering part;

[0030] There is more than one insertion part and torsion spring.

[0031] The beneficial effects of the present invention are as follows: A shallow sand filter that reduces backwashing is provided. By the combined use of a housing, a filter sand assembly, a water collection assembly, and a coarse filtration assembly, a shallow sand filter that reduces backwashing is fabricated to replace the traditional shallow sand filter. During the use of the shallow sand filter, a coarse filtration assembly is added to collect large particulate impurities in the sewage, achieving the effect of reducing the rate of flux reduction of the shallow sand filter and reducing the number of backwashes of the shallow sand filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0033] Figure 1 FIG. is a schematic diagram of the overall sectional structure of the housing and the water collection assembly of a shallow sand filter that reduces backwashing provided by an embodiment of the present disclosure.

[0034] Figure 2 FIG. is another schematic diagram of the overall sectional structure of the housing and the water collection assembly of a shallow sand filter that reduces backwashing provided by an embodiment of the present disclosure.

[0035] Figure 3 FIG. is a schematic diagram of the coarse filtration assembly of a shallow sand filter that reduces backwashing provided by an embodiment of the present disclosure.

[0036] In the figure: 1. Housing; 11. Water inlet; 12. Water outlet;

[0037] 2. Filter sand assembly;

[0038] 3. Water collection assembly;

[0039] 4. Coarse filtration assembly; 41. Mounting rod; 42. Left rod; 43. Intermediate rod; 44. Right rod; 45. Filtering member; 46. Upper cover; 461. Mounting ring; 462. Through hole; 463. Card slot; 47. Filter element; 471. Insertion part; 472. Filtering part; 473. Torsion spring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions of the present invention with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0041] In this document, when it is mentioned that a first component is located on a second component, this may mean that the first component can be directly formed on the second component, or a third component can be interposed between the first component and the second component. In addition, in the drawings, for the purpose of effectively describing the technical content, the thickness of the components may be exaggerated or reduced.

[0042] As used herein, phrases such as "in one embodiment", "according to one embodiment", "in some embodiments", etc. generally refer to the fact that the specific feature, structure, or characteristic after such phrase can be included in at least one embodiment of the present disclosure. Thus, the specific feature, structure, or characteristic may be included in more than one embodiment of the present disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms "example", "exemplary", etc. are used "as an example, instance, or illustration. Any embodiment, aspect, or design described herein as "example" or "exemplary" is not necessarily to be construed as preferred or superior to other embodiments, aspects, or designs. Instead, the use of the terms "example", "exemplary", etc. is intended to present concepts in a concrete manner.

[0043] It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it is not necessary to further define and explain it in subsequent drawings.

[0044] The following describes in detail some embodiments of the present invention with reference to the accompanying drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0045] Reference Figures 1 to 3, at least one embodiment provides a shallow sand filter for reducing backwashing, comprising: a housing 1, which includes a water inlet 11 and a water outlet 12. Sewage enters the cavity of the housing 1 from the water inlet 11, and finally the clean water is discharged through the water outlet. A filter sand assembly 2, which is located in the middle of the cavity of the housing 1 and is used for filtering the sewage. The filtered sewage becomes clean water, and the clean water drops under the action of gravity to contact the water collection assembly 3 below. A water collection assembly 3, which is located below the filter sand assembly 2 and is used for collecting the filtered clean water. After the water collection assembly 3 receives and collects the clean water, it discharges the clean water through the water outlet 12. The water outlet 12 is communicated with a clean water collection device, and the water inlet 11 is communicated with a sewage supply device. A coarse filtration assembly 4, which is located above the filter sand assembly 2 in the cavity of the housing 1, so that the sewage is secondarily filtered by the filter sand assembly 2 after being coarsely filtered. During this process, the sewage reaches the coarse filtration assembly from the water inlet 11, and large-particle impurities remain in the coarse filtration assembly 4. Then, the sewage is secondarily filtered by the filter sand assembly 2 after passing through the coarse filtration assembly 4. The water after secondary filtration is clean water that contacts the water collection assembly 3. The water collection assembly 3 discharges the clean water into the water outlet 12, and finally the clean water collection device pumps away the clean water. The coarse filtration assembly 4 includes a mounting rod 41 for providing a support position and a filtering component 45 for providing a coarse filtration function. The mounting rod 41 is connected to the inner wall of the housing 1, and the upper part of the filtering component 45 is sleeved on the mounting rod 41. The filtering component 45 is adapted to slide on the mounting rod 41 so that at least one of the filtering components 45 reaches directly below the water inlet 11.

[0046] In some embodiments, the mounting rod 41 includes an intermediate rod 43 in the middle, a left rod 42 and a right rod 44 with inclined ends. Both the left rod 42 and the right rod 44 are fixedly connected to the inner wall of the housing 1, so that the coarse filtration assembly 4 is adapted to slide on the left rod 42 and the right rod 44 to the intermediate rod 43. Since both the left rod 42 and the right rod 44 are higher than the intermediate rod 43, at least one of the plurality of coarse filtration assemblies 4 is located directly below the water inlet 11 under the action of gravity, and the other coarse filtration assemblies 4 are located on the same side of the intermediate rod 43, that is, the other coarse filtration assemblies 4 are located at the left rod 42 or the right rod 44. When the total amount of the filter element 47 on the coarse filtration assembly 4 on the intermediate rod 43 decreases and falls off, the adjacent coarse filtration assembly 4 descends to the intermediate rod 43 under the action of gravity. During this process, the upper cover 46 of the coarse filtration assembly 4 where the filter element 47 has fallen off is squeezed to the left rod 42 or the right rod 44 on the other side. At the same time, during the falling process of the filter element 47, under the action of the torsion spring 473, the insertion part 471 is driven to rotate to block the outlet of the cavity of the filtering part 472, avoiding the large-particle impurities collected in the filtering part 472 from falling onto the filter sand assembly 2 and causing blockage to it, thereby reducing the number of backwashing times. The filtering component 45 includes an upper cover 46 that is movably sleeved on the mounting rod 41, and the upper cover 46 is close to the water inlet 11.

[0047] In some embodiments, the cross-sections of the middle rod 43, the left rod 42, and the right rod 44 are all circular; the upper cover 46 includes a mounting ring 461 adapted to sleevedly mount the mounting rod 41, which is used to ensure that the coarse filtration assembly 4 is adapted to slide at the middle rod 43, the left rod 42, and the right rod 44 under the action of gravity, and to ensure that at least one coarse filtration assembly 4 is located directly below the middle rod 43.

[0048] In some embodiments, the mounting ring 461 is made of a rigid material; a through hole 462 serving as a sewage channel is formed in the middle of the upper cover 46, which is used to ensure that the sewage at the water inlet 11 directly reaches the inside of the filtering part 472 through the through hole 462, so as to realize the preliminary filtration of the sewage.

[0049] In some embodiments, the lower part of the filtering component 45 further includes a filter element 47 adapted to coarsely filter the sewage, which is used to directly filter the sewage; the filter element 47 is snap-connected to the upper cover 46, so that the filter element 47 automatically falls off after the flux decreases, and adjacent filter elements 47 can replace each other to reach directly below the water inlet 11; as large particulate impurities continuously accumulate in the filter element 47, the flux of this filter element 47 continuously decreases. At the same time, due to the decrease in flux, the pressure of the sewage provided by the water inlet 11 on the filter element 47 becomes larger, so that the insertion part 471 of the filter element 47 is separated from the card slot 463, so that the filter element 47 drops; since the gravity of the upper cover 46 decreases after being separated from the filter element 47, under the action of the adjacent coarse filtration assemblies 4, the upper cover 46 is pushed away from the middle rod 43.

[0050] In some embodiments, the filter element 47 is sleeved on the inclined left rod 42 or right rod 44, so that the filter element 47 reaches directly below the through hole 462 under the action of gravity; the filter element 47 includes an insertion part 471; a card slot 463 adapted to be snap-connected to the insertion part 471 is arranged on the upper cover 46 facing the filter element 47; thus, it is ensured that the two are snap-connected when the flux of the filter element 47 is large, and when the flux of the filter element 47 decreases, the sewage can push the two to separate.

[0051] In some embodiments, uniformly distributed protrusions adapted to contact the side wall of the card slot 463 are arranged on the side surface of the insertion part 471, which is used to increase the friction force between the insertion part 471 and the card slot 463; the insertion part 471 is made of a flexible material, so that the filter element 47 is adapted to drive the insertion part 471 to leave the card slot 463 under the impact of sewage after the flux is small, so that the adjacent coarse filtration assemblies 4 slide to the middle rod 43 and push away the upper cover 46 that has left the card slot 463.

[0052] In some embodiments, the filter element 47 further includes a torsion spring 473 and a filter portion 472; the filter portion 472 is connected to the end of the insertion portion 471 through a connecting shaft, and a cavity is provided on the filter portion 472 for directly receiving sewage; the connecting shaft penetrates through the torsion spring 473, so that after the insertion portion 471 is separated from the card slot 463, the torsion spring 473 is adapted to drive the insertion portion 471 to block the cavity of the filter portion 472, to prevent large particulate impurities in the cavity of the filter portion 472 from falling, which may affect the flux of the filter sand assembly 2.

[0053] In some embodiments, filter meshes are provided on both the bottom and the side of the filter portion 472; there is more than one insertion portion 471 and torsion spring 473 to ensure uniform force on the filter element 47.

[0054] In the description of the embodiments of the present invention, unless otherwise clearly defined and limited, the terms "installation", "connection" and "connection" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0055] In the description of the present invention, 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, 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, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0056] Although this patent document contains many details, it should not be construed as limiting the scope of any invention or claim, but rather as a description of the features of specific embodiments of a particular invention. Certain features described in the context of separate embodiments of this patent document may also be implemented in combination in a single embodiment. Conversely, the various functions described in the context of a single embodiment may also be implemented separately in multiple embodiments, or in any suitable sub-combination. In addition, although the above features may be described as acting in certain combinations, and even initially claimed as such, in some cases, one or more features in a claim combination may be removed from the combination, and the claim combination may be directed to a sub-combination or a variant of the sub-combination.

[0057] Similarly, although the operations are described in a particular order in the figures, this should not be construed as requiring that such operations be performed in the particular order shown or in sequential order, or that all of the illustrated operations be performed, to obtain the desired result. Additionally, the separation of various system components in the embodiments of this patent document should not be construed as required in all embodiments.

[0058] Only some implementations and examples are described, and other implementations, enhancements, and variations can be made based on what is described and illustrated in this patent document.

[0059] Although several embodiments are provided in this disclosure, it should be understood that the disclosed systems and methods may be embodied in many other specific forms without departing from the spirit or scope of the disclosure. The present examples are considered illustrative and not restrictive and are not limited to the details given. For example, various elements or components may be combined or integrated in another system, or some features may be omitted or not implemented.

Claims

1. A shallow sand filter for reducing backwashing, characterized in that, Comprising: A housing (1), which includes a water inlet (11) and a water outlet (12); A filter sand assembly (2), which is located in the middle of the cavity of the housing (1); A water collection assembly (3), which is located below the filter sand assembly (2) and is used to collect the filtered clear water; A coarse filtration assembly (4), which is located above the filter sand assembly (2) in the cavity of the housing (1) so that the sewage is secondarily filtered by the filter sand assembly (2) after coarse filtration; The coarse filtration assembly (4) includes a mounting rod (41) providing a support position and a filtering component (45) providing a coarse filtration function. The mounting rod (41) is connected to the inner wall of the housing (1), and the upper part of the filtering component (45) is sleeved on the mounting rod (41).

2. A shallow sand filter for reducing backwashing according to claim 1, characterized in that: The mounting rod (41) includes an intermediate rod (43) in the middle, a left rod (42) with inclined ends and a right rod (44). Both the left rod (42) and the right rod (44) are fixedly connected to the inner wall of the housing (1) so that the coarse filtration assembly (4) is adapted to slide on the left rod (42) and the right rod (44) to the intermediate rod (43); The filtering component (45) includes an upper cover (46) movably sleeved on the mounting rod (41), and the upper cover (46) is close to the water inlet (11).

3. A shallow sand filter for reducing backwashing according to claim 2, characterized in that: The cross-sections of the intermediate rod (43), the left rod (42) and the right rod (44) are all circular; The upper cover (46) includes a mounting ring (461) adapted to sleeve the mounting rod (41).

4. A shallow sand filter for reducing backwashing according to claim 2, characterized in that: The mounting ring (461) is made of a rigid material; A through hole (462) serving as a sewage channel is opened in the middle of the upper cover (46).

5. A shallow sand filter for reducing backwashing according to claim 1, characterized in that: The lower part of the filtering component (45) further includes a filter element (47) adapted to coarsely filter the sewage; The filter element (47) is snap-connected to the upper cover (46) so that the filter element (47) automatically falls off after the flux decreases, and adjacent filter elements (47) can replace each other to reach directly below the water inlet (11).

6. A shallow sand filter for reducing backwashing according to claim 5, characterized in that: The filter element (47) is sleeved at the inclined left rod (42) or right rod (44) so that the filter element (47) reaches directly below the through hole (462) under the action of gravity; The filter element (47) includes an insertion part (471); A clamping groove (463) adapted to be snap-connected to the insertion part (471) is provided on the upper cover (46) facing the filter element (47).

7. A shallow sand filter for reducing backwashing according to claim 6, characterized in that: The side of the insertion part (471) is provided with uniformly distributed protrusions adapted to contact the side wall of the clamping groove (463); The insertion part (471) is made of a flexible material, so that after the flux of the filter element (47) becomes small, the filter element (47) is adapted to drive the insertion part (471) out of the clamping groove (463) under the impact of sewage, so that the adjacent coarse filter assemblies (4) slide to the middle rod (43), and push the upper cover (46) that has left the clamping groove (463) away.

8. The method for using a shallow sand filter for reducing backwashing according to claim 5, characterized in that: The filter element (47) further includes a torsion spring (473) and a filtering part (472); The filtering part (472) is connected to the end of the insertion part (471) through a connecting shaft, and a cavity is provided on the filtering part (472); The connecting shaft penetrates through the torsion spring (473), so that after the insertion part (471) is separated from the clamping groove (463), the torsion spring (473) is adapted to drive the insertion part (471) to block the cavity of the filtering part (472).

9. The method for using a shallow sand filter for reducing backwashing according to claim 8, characterized in that: Filter meshes are provided on both the bottom and the side of the filtering part (472); Both the insertion part (471) and the torsion spring (473) are more than one.

Images