CN216259530U - Raw water filtering device with backwashing function - Google Patents

Abstract

The utility model discloses a raw water filtering device with a back washing function, and belongs to the field of raw water filtering devices. The purpose provides a device, can carry out effective filtration to the raw water, can wash filtering mechanism through the mode of back flush simultaneously, need not demolish it, has reduced workman's intensity of labour, does benefit to the manufacturing. The technical scheme is that the raw water filtering device with the back washing function comprises at least one filtering mechanism, a first switch, a second switch, a third switch, a fourth switch, a first main pipe and a second main pipe.

Description

Raw water filtering device with backwashing function

Technical Field

The utility model belongs to the field of raw water filtering devices, and relates to a raw water filtering device with a backwashing function.

Background

Raw water is generally a natural water source collected in nature, including underground water, spring water, reservoir water and the like, without any artificial purification treatment. The raw water is required to be filtered by a filtering device before being used or drunk, suspended matters, microorganisms and other fine particles in the water are removed by utilizing a filtering medium, the turbidity of the water is finally reduced, the water quality is purified, and the interior of the filter is required to be cleaned after the filter is used for a period of time.

In the process of implementing the utility model, the inventor finds that at least the following problems exist in the prior art: after the filtering apparatus is used for a period of time, impurities, dust, suspended substances or other macromolecular substances are collected in the filtering apparatus, so that the filter bag inside the filtering apparatus needs to be cleaned periodically. When cleaning filtration equipment, at first need shut down the operation, the manual work is dismantled the change with the inside straining mechanism of filtration equipment and the manual work washs filtering mechanism, and intensity of labour is bigger like this, and the down time is also longer, influences the production progress easily.

Disclosure of Invention

In view of this, the present invention is directed to provide a raw water filtering apparatus with a backwashing function, which can effectively filter raw water, and can clean a filtering mechanism in a backwashing manner without disassembling the filtering mechanism, thereby reducing labor intensity of workers and facilitating production and manufacturing.

The inventor provides a raw water filtering device with a backwashing function, which comprises at least one filtering mechanism, a first switch, a second switch, a third switch, a fourth switch, a first main pipe and a second main pipe, wherein the first main pipe is provided with a first water inlet and a first water outlet, the first switch is arranged on the first main pipe and close to the first water inlet, the second switch is arranged on the first main pipe and close to the first water outlet, the second main pipe is provided with a second water inlet and a second water outlet, the third switch is arranged on the second main pipe and close to the second water inlet, the fourth switch is arranged on the second main pipe and close to the second water outlet, and the second main pipe is communicated with the first main pipe through the second water inlet, the second water inlet is located the first person in charge who is close to first water inlet of first switch on, filtering mechanism's one end and the first person in charge intercommunication, filtering mechanism's the other end and the second are responsible for the intercommunication, filtering mechanism's one end is located the first person in charge between first switch and the second switch on, filtering mechanism's the other end is located the second between third switch and the fourth switch and is responsible for on.

The filtering mechanism comprises a first filtering mechanism and a second filtering mechanism.

The filter is characterized by further comprising a first connecting pipe, a second connecting pipe, a third connecting pipe and a fourth connecting pipe, wherein one end of the first filtering mechanism is communicated with the first main pipe through the first connecting pipe, the other end of the first filtering mechanism is communicated with the second main pipe through the second connecting pipe, the first connecting pipe is provided with a fifth switch, and the second connecting pipe is provided with a sixth switch; one end of the second filtering mechanism is communicated with the first main pipe through a third connecting pipe, the other end of the second filtering mechanism is communicated with the second main pipe through a fourth connecting pipe, a seventh switch is arranged on the third connecting pipe, and an eighth switch is arranged on the fourth connecting pipe.

The third main pipe is communicated with the first connecting pipe, a third water inlet and a third water outlet are formed in the third main pipe, the third water inlet is located on the first connecting pipe between the fifth switch and the first filtering mechanism, and a ninth switch is arranged on the third main pipe; the fourth main pipe is communicated with the third connecting pipe, a fourth water inlet and a fourth water outlet are formed in the fourth main pipe, the fourth water inlet is located on the third connecting pipe between the seventh switch and the second filtering mechanism, and a tenth switch is arranged on the fourth main pipe; the fifth main pipe is communicated with the second connecting pipe, a fifth water inlet and a fifth water outlet are formed in the fifth main pipe, the fifth water inlet is located in the second connecting pipe between the sixth switch and the first filtering mechanism, and an eleventh switch is arranged on the fifth main pipe; the sixth main pipe is communicated with the fourth connecting pipe, a sixth water inlet and a sixth water outlet are formed in the sixth main pipe, the sixth water inlet is located on the fourth connecting pipe between the eighth switch and the second filtering mechanism, and a twelfth switch is arranged on the sixth main pipe.

The third water outlet is positioned on the first main pipe between the second switch and the first water outlet; the fourth water outlet is positioned on the first main pipe between the second switch and the first water outlet; the fifth water outlet is positioned on the second main pipe between the fourth switch and the second water outlet; the sixth water outlet is positioned on the second main pipe between the fourth switch and the second water outlet.

And the filtering mechanisms are all filters.

The first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch, the seventh switch, the eighth switch, the ninth switch, the tenth switch, the eleventh switch and the twelfth switch are all ball valves or gate valves.

Compared with the prior art, one of the technical solutions has the following advantages:

a) the utility model adopts the arrangement of at least one filtering mechanism, a first switch, a second switch, a third switch, a fourth switch, a first main pipe and a second main pipe, can control the switch state of each switch, and adjusts the water inlet direction of the filtering mechanism so as to realize the filtering mechanism for filtering or back washing and cleaning raw water through the filtering mechanism.

b) According to the utility model, the filtering mechanism comprises the first filtering mechanism and the second filtering mechanism, so that the efficiency of filtering raw water can be improved.

c) According to the utility model, the first connecting pipe, the second connecting pipe, the third connecting pipe and the fourth connecting pipe are adopted, the fifth switch is arranged on the first connecting pipe, the sixth switch is arranged on the second connecting pipe, the seventh switch is arranged on the third connecting pipe, the eighth switch is arranged on the fourth connecting pipe, when the first filtering mechanism or the second filtering mechanism needs to be disassembled and replaced, the two ends of the connecting pipes can be blocked by the corresponding switches, and meanwhile, the other filtering mechanism can still work normally.

d) According to the utility model, a third main pipe, a fourth main pipe, a fifth main pipe and a sixth main pipe are adopted, a third water inlet and a third water outlet are arranged on the third main pipe, a ninth switch is arranged on the third main pipe, a fourth water inlet and a fourth water outlet are arranged on the fourth main pipe, a tenth switch is arranged on the fourth main pipe, a fifth water inlet and a fifth water outlet are arranged on the fifth main pipe, an eleventh switch is arranged on the fifth main pipe, a sixth water inlet and a sixth water outlet are arranged on the sixth main pipe, and a twelfth switch is arranged on the sixth main pipe.

e) The utility model adopts the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch, the seventh switch, the eighth switch, the ninth switch, the tenth switch, the eleventh switch and the twelfth switch which are all arranged as ball valves or gate valves, and has the advantages of simple installation mode, convenient disassembly and replacement, good plugging effect and the like.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic perspective view of an embodiment of a raw water filtration apparatus with a backwashing function according to the present invention.

Fig. 2 is a schematic perspective view of a raw water filtering apparatus with backwashing function according to a preferred embodiment of the present invention.

Fig. 3 is a schematic perspective view of a raw water filtering apparatus with backwashing function according to another preferred embodiment of the present invention.

The labels in the figure are respectively: 110 first filter mechanism, 120 second filter mechanism, 210 first main pipe, 211 first switch, 212 second switch, 220 second main pipe, 221 third switch, 222 fourth switch, 230 third main pipe, 231 ninth switch, 240 fourth main pipe, 241 tenth switch, 250 fifth main pipe, 251 eleventh switch, 260 sixth main pipe, 261 twelfth switch, 310 first connecting pipe, 311 fifth switch, 320 second connecting pipe, 321 sixth switch, 330 third connecting pipe, 331 seventh switch, 340 fourth connecting pipe, 341 eighth switch.

Detailed Description

The following description is made with reference to the accompanying drawings and a specific embodiment.

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it may not be further defined and explained in subsequent figures.

Example 1:

see fig. 1. The embodiment describes a raw water filtering device with backwashing function, which comprises at least one filtering mechanism, a first switch 211, a second switch 212, a third switch 221, a fourth switch 222, a first main pipe 210 and a second main pipe 220, wherein the first main pipe 210 is provided with a first water inlet and a first water outlet, the first switch 211 is installed on the first main pipe 210 near the first water inlet, the second switch 212 is installed on the first main pipe 210 near the first water outlet, the second main pipe 220 is provided with a second water inlet and a second water outlet, the third switch 221 is installed on the second main pipe 220 near the second water inlet, the fourth switch 222 is installed on the second main pipe 220 near the second water outlet, the second main pipe 220 is communicated with the first main pipe 210 through the second water inlet, the second water inlet is located on the first main pipe 210 where the first switch 211 is near the first water inlet, one end of the filtering mechanism is communicated with the first main pipe 210, the other end of the filtering mechanism is communicated with the second main pipe 220, one end of the filtering mechanism is positioned on the first main pipe 210 between the first switch 211 and the second switch 212, and the other end of the filtering mechanism is positioned on the second main pipe 220 between the third switch 221 and the fourth switch 222.

Specifically, the filtering mechanisms are all filters.

Specifically, the first switch 211, the second switch 212, the third switch 221 and the fourth switch 222 are all ball valves.

In the embodiment, when filtering, the first switch 211 and the fourth switch 222 need to be turned on, and the second switch 212 and the third switch 221 need to be turned off, so that water enters the first main pipe 210 from the first water inlet of the first main pipe 210, enters the filtering mechanism from one end of the filtering mechanism for filtering, is discharged from the other end of the filtering mechanism into the second main pipe 220 after filtering, and is finally discharged from the second water outlet of the second main pipe 220 to complete filtering.

In the embodiment, when backwashing is performed, the second switch 212 and the third switch 221 need to be opened, and the first switch 211 and the fourth switch 222 need to be closed, so that water enters the first main pipe 210 from the first water inlet of the first main pipe 210, then enters the second main pipe 220 through the second water inlet of the second main pipe 220, enters the filtering mechanism from the other end of the filtering mechanism, is discharged from one end of the filtering mechanism and enters the first main pipe 210, and finally is discharged from the first water outlet of the first main pipe 210 to complete backwashing.

Example 2:

see fig. 2. In this embodiment, a raw water filtering device with a backwashing function is described, and this embodiment is a further technical solution in embodiment 1, so that repeated contents in embodiment 1 are not described in detail in this embodiment, and specifically, the filtering mechanism includes a first filtering mechanism 110 and a second filtering mechanism 120.

Specifically, the filter further comprises a first connecting pipe 310, a second connecting pipe 320, a third connecting pipe 330 and a fourth connecting pipe 340, wherein one end of the first filtering mechanism 110 is communicated with the first main pipe 210 through the first connecting pipe 310, the other end of the first filtering mechanism 110 is communicated with the second main pipe 220 through the second connecting pipe 320, the first connecting pipe 310 is provided with a fifth switch 311, and the second connecting pipe 320 is provided with a sixth switch 321; one end of the second filtering mechanism 120 is communicated with the first main pipe 210 through a third connecting pipe 330, the other end of the second filtering mechanism 120 is communicated with the second main pipe 220 through a fourth connecting pipe 340, a seventh switch 331 is arranged on the third connecting pipe 330, and an eighth switch 341 is arranged on the fourth connecting pipe 340. In this embodiment, by providing the fifth switch 311, the sixth switch 321, the seventh switch 331 and the eighth switch 341, filtration or backwashing can be performed while one of the filter mechanisms is out of order and needs to be disassembled for maintenance and replacement, for example, when the first filter mechanism 110 is out of order, the first filter mechanism 110 can be disassembled for maintenance by closing the fifth switch 311 and the sixth switch 321; when the second filter mechanism 120 fails, the seventh switch 331 and the eighth switch 341 are turned off, and the second filter mechanism 120 can be disassembled and repaired.

Specifically, the first switch 211, the second switch 212, the third switch 221, the fourth switch 222, the fifth switch 311, the sixth switch 321, the seventh switch 331, and the eighth switch 341 are gate valves.

Example 3:

see fig. 3. The present embodiment describes a raw water filtering apparatus with a back-flushing function, and the present embodiment is a further technical solution in embodiment 2, so that repeated contents in embodiment 1 are not described in more detail in the present embodiment, specifically, the apparatus further includes a third main pipe 230, a fourth main pipe 240, a fifth main pipe 250, and a sixth main pipe 260, the third main pipe 230 is communicated with a first connecting pipe 310, the third main pipe 230 is provided with a third water inlet and a third water outlet, the third water inlet is located on the first connecting pipe 310 between a fifth switch 311 and a first filtering mechanism 110, and the third main pipe 230 is provided with a ninth switch 231; the fourth main pipe 240 is communicated with the third connecting pipe 330, a fourth water inlet and a fourth water outlet are arranged on the fourth main pipe 240, the fourth water inlet is positioned on the third connecting pipe 330 between the seventh switch 331 and the second filtering mechanism 120, and a tenth switch 241 is arranged on the fourth main pipe 240; the fifth main pipe 250 is communicated with the second connecting pipe 320, a fifth water inlet and a fifth water outlet are arranged on the fifth main pipe 250, the fifth water inlet is positioned on the second connecting pipe 320 between the sixth switch 321 and the first filtering mechanism 110, and an eleventh switch 251 is arranged on the fifth main pipe 250; the sixth main pipe 260 is communicated with the fourth connecting pipe 340, a sixth water inlet and a sixth water outlet are arranged on the sixth main pipe 260, the sixth water inlet is located on the fourth connecting pipe 340 between the eighth switch 341 and the second filtering mechanism 120, and a twelfth switch 261 is arranged on the sixth main pipe 260.

Specifically, the third water outlet is located on the first main pipe 210 between the second switch 212 and the first water outlet; the fourth water outlet is positioned on the first main pipe 210 between the second switch 212 and the first water outlet; the fifth water outlet is positioned on the second main pipe 220 between the fourth switch 222 and the second water outlet; the sixth water outlet is located on the second main pipe 220 between the fourth switch 222 and the second water outlet.

Specifically, the first switch 211, the second switch 212, the third switch 221, the fourth switch 222, the fifth switch 311, the sixth switch 321, the seventh switch 331, the eighth switch 341, the ninth switch 231, the tenth switch 241, the eleventh switch 251, and the twelfth switch 261 are gate valves.

In this embodiment, in addition to the two filtering mechanisms performing filtering or backwashing simultaneously, one of the filtering mechanisms may perform filtering while the other filtering mechanism performs backwashing.

The specific operation mode is as follows:

when the first filter mechanism 110 and the second filter mechanism 120 filter simultaneously, it is necessary to turn on the first switch 211, the fourth switch 222, the fifth switch 311, the sixth switch 321, the seventh switch 331, the eighth switch 341, the eleventh switch 251, and the twelfth switch 261, and turn off the second switch 212, the third switch 221, the ninth switch 231, and the tenth switch 241. The water enters the first main pipe 210 from the first water inlet of the first main pipe 210, the water in the first main pipe 210 enters the first filter mechanism 110 from one end of the first filter mechanism 110 through the first connecting pipe 310 for filtering, and then is discharged from the other end of the first filter mechanism 110 to enter the second connecting pipe 320, the water in the second connecting pipe 320 can directly enter the second main pipe 220, the water in the second connecting pipe 320 can also enter the second main pipe 220 through the fifth main pipe 250, the water in the first main pipe 210 simultaneously enters the second filter mechanism 120 from one end of the second filter mechanism 120 through the third connecting pipe 330 for filtering, and then is discharged from the other end of the second filter mechanism 120 to enter the fourth connecting pipe 340, the water in the fourth connecting pipe 340 can directly enter the second main pipe 220, the water in the fourth connecting pipe 340 can also enter the second main pipe 220 through the sixth main pipe 260, and finally discharged from the second water outlet of the second main pipe 220. When the first filtering mechanism 110 and the second filtering mechanism 120 filter simultaneously, the second switch 212, the third switch 221, the ninth switch 231, and the tenth switch 241 are turned off, and then the first switch 211, the fourth switch 222, the fifth switch 311, the sixth switch 321, the seventh switch 331, and the eighth switch 341 are turned on to perform filtering, and the eleventh switch 251 and the twelfth switch 261 can be selectively turned on according to the flow rate; the second switch 212, the third switch 221, the ninth switch 231, and the tenth switch 241 may be turned off, and of the first switch 211, the fourth switch 222, the fifth switch 311, the sixth switch 321, the seventh switch 331, the eighth switch 341, the eleventh switch 251, and the twelfth switch 261, the first filter mechanism 110 and the second filter mechanism 120 may also perform filtering when the first switch 211, the fifth switch 311, the seventh switch 331, the eleventh switch 251, and the twelfth switch 261 are simultaneously turned on, and at this time, the fourth switch 222, the sixth switch 321, and the eighth switch 341 may be selectively and simultaneously turned on.

When the first filter mechanism 110 and the second filter mechanism 120 are backwashed simultaneously, the second switch 212, the third switch 221, the fifth switch 311, the sixth switch 321, the seventh switch 331, the eighth switch 341, the ninth switch 231, and the tenth switch 241 need to be turned on, and the first switch 211, the fourth switch 222, the eleventh switch 251, and the twelfth switch 261 need to be turned off. The water enters the first main pipe 210 from the first water inlet of the first main pipe 210, and then enters the second main pipe 220 through the second water inlet of the second main pipe 220, the water in the second main pipe 220 enters the other end of the first filter mechanism 110 through the second connecting pipe 320, and then is discharged from one end of the first filter mechanism 110 into the first connecting pipe 310, the water in the first connecting pipe 310 can directly enter the first main pipe 210, the water in the first connecting pipe 310 can also enter the first main pipe through the third main pipe 230, while the water in the second main pipe 220 enters the other end of the second filter mechanism 120 through the fourth connecting pipe 340, and then is discharged from one end of the second filter mechanism 120 into the third connecting pipe 330, the water in the third connecting pipe 330 can directly enter the first main pipe 210, the water in the third connecting pipe 330 can also enter the first main pipe 210 through the fourth main pipe 240, finally, the water is discharged from the first water discharge port of the first main pipe 210 to complete the backwashing. It should be noted that, when the first filter mechanism 110 and the second filter mechanism 120 are backwashed simultaneously, the first switch 211, the fourth switch 222, the eleventh switch 251 and the twelfth switch 261 are turned off, and then the first filter mechanism 110 and the second filter mechanism 120 can be backwashed simultaneously after the second switch 212, the third switch 221, the fifth switch 311, the sixth switch 321, the seventh switch 331 and the eighth switch 341 are turned on, and the ninth switch 231 and the tenth switch 241 can be selectively turned on according to the flow rate; the first switch 211, the fourth switch 222, the eleventh switch 251 and the twelfth switch 261 can be turned off, the third switch 221, the sixth switch 321, the eighth switch 341, the ninth switch 231 and the tenth switch 241 can be turned on to perform backwashing, and the second switch 212, the fifth switch 311 and the seventh switch 331 can be turned on or off simultaneously according to the flow rate.

When the first filter unit 110 performs filtration and the second filter unit 120 performs backwashing, the first switch 211, the third switch 221, the fifth switch 311, the eighth switch 341, the tenth switch 241, and the eleventh switch 251 need to be turned on, and the second switch 212, the fourth switch 222, the sixth switch 321, the seventh switch 331, the ninth switch 231, and the twelfth switch 261 need to be turned off. The water enters the first main pipe 210 from a first water inlet of the first main pipe 210, then enters one end of the first filtering mechanism 110 through the first connecting pipe 310, is discharged from the other end of the first filtering mechanism 110 into the second connecting pipe 320, then enters the second main pipe 220 through the fifth main pipe 250, and is discharged from a second water outlet of the second main pipe 220 to be filtered through the first filtering mechanism 110; the water entering the first main pipe 210 enters the second main pipe 220 from the second water inlet of the second main pipe 220, enters the second main pipe 220 from the other end of the second filtering mechanism 120 through the fourth connecting pipe 340, is discharged from one end of the second filtering mechanism 120, enters the third connecting pipe 330, enters the first main pipe 210 through the fourth main pipe 240, and finally finishes the back washing of the second filtering mechanism 120 from the first water outlet of the first main pipe 210.

When the first filter mechanism 110 performs backwashing and the second filter mechanism 120 performs filtration, the first switch 211, the third switch 221, the sixth switch 321, the seventh switch 331, the ninth switch 231, and the twelfth switch 261 need to be turned on, and the second switch 212, the fourth switch 222, the fifth switch 311, the eighth switch 341, the tenth switch 241, and the eleventh switch 251 need to be turned off. The water enters the first main pipe 210 from the first water inlet of the first main pipe 210, then enters one end of the second filtering mechanism 120 through the third connecting pipe 330, is discharged from the other end of the second filtering mechanism 120 to enter the fourth connecting pipe 340, then enters the second main pipe 220 through the sixth main pipe 260, and is discharged from the second water outlet of the second main pipe 220 to be filtered through the second filtering mechanism 120; the water entering the first main pipe 210 enters from the second water inlet of the second main pipe 220, enters from the other end of the first filtering mechanism 110 through the second connecting pipe 320, is discharged from one end of the first filtering mechanism 110 into the first connecting pipe 310, enters into the first main pipe 210 through the third main pipe 230, and finally completes the back washing of the first filtering mechanism 110 from the first water outlet of the first main pipe 210.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

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

The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the utility model, and these modifications and adaptations should be considered within the scope of the utility model.

Claims (7)

1. The raw water filtering device with the back flushing function is characterized by comprising at least one filtering mechanism, a first switch (211), a second switch (212), a third switch (221), a fourth switch (222), a first main pipe (210) and a second main pipe (220), wherein the first main pipe (210) is provided with a first water inlet and a first water outlet, the first switch (211) is installed on the first main pipe (210) and close to the first water inlet, the second switch (212) is installed on the first main pipe (210) and close to the first water outlet, the second main pipe (220) is provided with a second water inlet and a second water outlet, the third switch (221) is installed on the second main pipe (220) and close to the second water inlet, the fourth switch (222) is installed on the second main pipe (220) and close to the second water outlet, and the second main pipe (220) is communicated with the first main pipe (210) through the second water inlet, the second water inlet is located first being responsible for (210) that first switch (211) is close to first water inlet, the one end and the first being responsible for (210) intercommunication of filter mechanism, the other end and the second of filter mechanism are responsible for (220) intercommunication, the one end of filter mechanism is located first being responsible for (210) between first switch (211) and second switch (212), the other end of filter mechanism is located second between third switch (221) and fourth switch (222) and is responsible for (220).

2. The raw water filtering apparatus with backwashing function as claimed in claim 1, wherein the filtering means includes a first filtering means (110) and a second filtering means (120).

3. The raw water filtering device with backwashing function according to claim 2, further comprising a first connecting pipe (310), a second connecting pipe (320), a third connecting pipe (330), and a fourth connecting pipe (340), wherein one end of the first filtering mechanism (110) is communicated with the first main pipe (210) through the first connecting pipe (310), the other end of the first filtering mechanism (110) is communicated with the second main pipe (220) through the second connecting pipe (320), the first connecting pipe (310) is provided with a fifth switch (311), and the second connecting pipe (320) is provided with a sixth switch (321); one end of the second filtering mechanism (120) is communicated with the first main pipe (210) through a third connecting pipe (330), the other end of the second filtering mechanism (120) is communicated with the second main pipe (220) through a fourth connecting pipe (340), a seventh switch (331) is arranged on the third connecting pipe (330), and an eighth switch (341) is arranged on the fourth connecting pipe (340).

4. The raw water filtering device with a backwashing function as claimed in claim 3, further comprising a third main pipe (230), a fourth main pipe (240), a fifth main pipe (250), and a sixth main pipe (260), wherein the third main pipe (230) is communicated with the first connecting pipe (310), the third main pipe (230) is provided with a third water inlet and a third water outlet, the third water inlet is located on the first connecting pipe (310) between the fifth switch (311) and the first filtering mechanism (110), and the third main pipe (230) is provided with a ninth switch (231); the fourth main pipe (240) is communicated with the third connecting pipe (330), a fourth water inlet and a fourth water outlet are formed in the fourth main pipe (240), the fourth water inlet is located on the third connecting pipe (330) between the seventh switch (331) and the second filtering mechanism (120), and a tenth switch (241) is arranged on the fourth main pipe (240); the fifth main pipe (250) is communicated with the second connecting pipe (320), a fifth water inlet and a fifth water outlet are formed in the fifth main pipe (250), the fifth water inlet is located in the second connecting pipe (320) between the sixth switch (321) and the first filtering mechanism (110), and an eleventh switch (251) is arranged on the fifth main pipe (250); the sixth main pipe (260) is communicated with the fourth connecting pipe (340), a sixth water inlet and a sixth water outlet are formed in the sixth main pipe (260), the sixth water inlet is located in the fourth connecting pipe (340) between the eighth switch (341) and the second filtering mechanism (120), and a twelfth switch (261) is formed in the sixth main pipe (260).

5. The raw water filtering device with backwashing function as claimed in claim 4, wherein the third water outlet is located on the first main pipe (210) between the second switch (212) and the first water outlet; the fourth water outlet is positioned on the first main pipe (210) between the second switch (212) and the first water outlet; the fifth water outlet is positioned on the second main pipe (220) between the fourth switch (222) and the second water outlet; the sixth water outlet is positioned on the second main pipe (220) between the fourth switch (222) and the second water outlet.

6. The raw water filtering apparatus with backwashing function as claimed in claim 1, wherein the filtering mechanisms are all filters.

7. The raw water filtering apparatus with a backwashing function according to claim 4, wherein the first switch (211), the second switch (212), the third switch (221), the fourth switch (222), the fifth switch (311), the sixth switch (321), the seventh switch (331), the eighth switch (341), the ninth switch (231), the tenth switch (241), the eleventh switch (251), and the twelfth switch (261) are all ball valves or gate valves.

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