CN219860962U - Multistage filtration system - Google Patents

Abstract

The present utility model relates to a multi-stage filtration system comprising a plurality of filtration devices, said filtration devices comprising: an outer housing defining a first chamber and provided with a water outlet; the inner shell is accommodated in the first cavity and defines a second cavity, a filter screen is arranged on the inner shell, the first cavity is communicated with the second cavity through the filter screen, a floating block is arranged in the second cavity, and a water outlet is higher than the filter screen and lower than the floating block; the water inlet pipe is communicated with the second chamber; a blow-down pipe communicated with the second chamber and comprising an inner wall; the valve is hinged with the inner wall and connected with the floating block through a rope; wherein, filter equipment includes filtration state and washing state, and at filtration state, the liquid level in the second cavity is less than the kicking block valve and closes, and at washing state, the kicking block rises and pulls the valve to open when the liquid level risees, and a plurality of filter equipment delivery ports and inlet tube connect gradually, and filter screen precision improves in proper order, can realize classifying filtration and improve water purification efficiency.

Description

Multistage filtration system

Technical Field

The utility model relates to the technical field of water treatment equipment, in particular to a multistage filtering system.

Background

The filtering device is an important device in the water treatment system, and plays an important role in the normal operation of the water treatment device and the acquisition of good water quality. The water to be treated flows through the filter screen after entering from the water inlet, then enters into a pipeline required by a user through the water outlet pipe for process circulation, and residues and sludge in the water are trapped inside the filter screen. So continuous circulation, the residue and the mud that are held back on the filter screen are more and more, lead to the filter screen to block up, and then influence the filter effect, consequently need regularly wash the filter screen, traditional filter equipment need demolish the back washing with the filter screen, waste time and energy, and the cleaning performance is poor. In order to solve the above problems, a filter device that can be self-cleaning is required. Most of the existing filtering devices capable of realizing self-cleaning adopt siphons or water pumps to realize self-cleaning of filter screens, and the structure is complex.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems in the related art to some extent.

Therefore, an object of the present utility model is to provide a multi-stage filtration system, which includes a plurality of filtration devices, wherein each stage of filtration device can use filtered water as backwash water, so that water flow backflushes a filter screen, thereby cleaning residues and sludge on the filter screen, realizing self-cleaning of the filter screen, and the filter screen filtration precision of the plurality of filtration devices is sequentially increased, so that the filtration efficiency and effect can be improved by stage filtration.

An embodiment of the utility model provides a multi-stage filtration system (500) comprising a plurality of filtration devices (100), the filtration devices (100) comprising: an outer housing (11) defining a first chamber (111) and provided with a water outlet (112);

the inner shell (12), the inner shell (12) is accommodated in the first chamber (111) and defines a second chamber (121) together with the outer shell, a filter screen (122) is arranged on the inner shell, the first chamber (111) is communicated with the second chamber (121) through the filter screen (122), a floating block (13) is arranged in the second chamber (121), and the water outlet (112) is higher than the filter screen (122) and lower than the floating block (13); -a water inlet pipe (123), said water inlet pipe (123) communicating with said second chamber (121); -a drain pipe (124), the drain pipe (124) being in communication with the second chamber (121) and comprising an inner wall (124 a); and a valve (14), the valve (14) being hinged to the inner wall (124 a) and connected to the float (13) by means of a rope (15);

the filtering device (100) comprises a filtering state and a flushing state, the liquid level in the second chamber (121) is lower than that of the floating block (13) and the valve (14) is closed, the liquid level in the second chamber (121) is higher than that of the water outlet in the flushing state, the floating block is lifted and pulls the valve to be opened, the filtering devices (100) are sequentially connected in a grading manner from low to high according to the filtering precision of the respective filter screen (122), and the water outlet (112) of the filtering device (100) at the upper stage is communicated with the water inlet pipe of the filtering device (100) at the lower stage.

The multistage filtering system comprises a plurality of filtering devices which are sequentially connected according to the precision of a filter screen, untreated water is injected into a second chamber from a water inlet, and untreated sewage enters a first chamber and flows out from a water outlet after being filtered by the filter screen; after the filter screen is blocked by sundries, the water flow of the first chamber entering into the second chamber is reduced, when the water flow injected into the second chamber is larger than the water discharge of the water outlet, the floating block in the second chamber can rise along with the water level and drag the valve hinged to the inner wall of the sewage pipe to rotate, after the valve is opened, water in the second chamber can be discharged from the sewage pipe, and due to the water level pressure difference, clear water reserved from the upper side of the filter screen to the water outlet also flows downwards, so that residues and sludge on the filter screen are reversely washed, and discharged from the sewage discharging device at the bottom, thereby realizing self cleaning of the filter screen, the water outlet of the upper filtering device is connected with the water inlet pipe of the lower filtering device, and clear water filtered by the upper filtering device enters the lower filtering device to be further filtered, so that the filtering effect and efficiency can be improved.

In addition, the filtering device according to the above embodiment of the present utility model may have the following additional technical features.

In some embodiments, the filter device (100) comprises a water baffle (16) disposed in the second chamber (121), the water baffle (16) having an upper side wall (161) connected to the outer housing (11) and a lower baffle (162) connected to the upper side wall (161), the upper side wall (161) extending in a vertical direction, the lower baffle (162) being inclined towards the inner housing (12) with a gap left between the lower baffle and the inner housing (12). The water baffle that sets up the slope and set up is buffered from the rivers in the inlet tube inflow second cavity, and when water got into the blow off pipe from the space in, the baffle can slow down the impact force of the water of getting into, avoids water impact too big mud and the residue of making the second cavity to turn up the filtration that influences the filter screen.

In some embodiments, the inner housing (12) includes an upper peripheral wall (125) and a lower peripheral wall (126) connected to the outer housing (11), the screen (122) is disposed obliquely between the upper peripheral wall (125) and the lower peripheral wall (126) and has a first top (122 b) and a first bottom (122 c), the first top (122 b) is connected to the upper peripheral wall (125), the first bottom (122 c) is connected to the lower peripheral wall (126), and the screen (122), the upper peripheral wall (125), the lower peripheral wall (126), and the outer housing (11) define a second chamber (121) together. The inner shell is divided into the upper and lower peripheral walls which are not connected up and down, and the filter screen is arranged between the upper and lower peripheral walls for connection, so that the efficiency of filtering sewage can be maximized, and the filter screen which is obliquely arranged is also beneficial to back flushing.

In some embodiments, the upper peripheral wall (125) has a second top (125 a), the second top (125 a) is connected with a water inlet pipe (123) for communicating the outside of the outer casing (11) with the second chamber (121), and the water inlet pipe is directly connected to the inner casing from the outside of the first chamber, so that sewage in the water inlet pipe can be effectively prevented from entering the first chamber, and the filtered and purified clean water is polluted.

In some embodiments, the lower peripheral wall (126) has a second bottom (126 a), and the second bottom (126 a) is connected with a drain pipe (124) that communicates the outside of the outer housing (11) and the second chamber (121), and the drain pipe is directly connected to the inner housing from the outside of the first chamber, so that the sludge in the second chamber can be effectively prevented from entering the first chamber, and the filtered and purified clean water is polluted.

In some embodiments, the longitudinal section of the lower peripheral wall (126) is gradually reduced from top to bottom to form a converging port (126 b), the sewage draining pipe (124) is connected with the converging port (126 b), and the closing-in design of the lower peripheral wall of the inner shell is beneficial to centralized removal of sludge impurities.

In some embodiments, a first pulley (17) is arranged at the corner where the converging port (126 b) is connected with the drain pipe (124), the rope (15) is partially wound on the pulley (17), and the pulley is arranged at the corner to change the rope direction, so that the sliding friction between the rope and the device is changed into rolling friction, the floating block is beneficial to rising along with the liquid level, and the service life of the rope is prolonged.

In some embodiments, the inner wall of the drain pipe is also connected with a second pulley (18), the rope (15) is partially wound on the second pulley (18), and the pulley is arranged to change the rope direction, so that the sliding friction between the rope and the device is changed into rolling friction, the floating block is beneficial to rising along with the liquid level, and the service life of the rope is prolonged.

In some embodiments, the device further comprises a support (19) connected with the upper peripheral wall (125), the support (19) comprises a guide part (191), the guide part (191) comprises a through hole (191 a) extending along the vertical direction, one end of the rope (15) is connected with the valve (14), the other end of the rope passes through the through hole (191 a) and is connected with the floating block (13), the top end of the guide part (191) is higher than the water outlet (112), and the support is arranged to provide guide and support for the floating block, so that the height of the floating block is ensured to be larger than the water outlet.

In some embodiments, the screen (122) is angled from the horizontal between (60 ° -80 °), and too large an angle has poor backwash effect, and too small an angle affects the water flow in the second chamber into the first chamber.

According to the multistage filtering system provided by the embodiment of the utility model, the multistage filtering devices with different filtering precision are arranged, the plurality of filtering devices are sequentially connected in an ending way, the multistage filtering can realize precise filtering, and the filtering efficiency and the filtering effect are improved. Injecting water from the top of the water inlet pipe, filtering the water by a filter screen, enabling the filtered water to enter a first chamber, retaining residues and sludge in the water on the filter screen, and enabling clear water to flow out from the water outlet pipe when the water level in the first chamber is higher than that of the water outlet pipe; after long-time use, the residue and the sludge on the filter screen are retained too much to lead to the water injection quantity of filter equipment to be greater than the displacement, and further, the liquid level in the second cavity rises and drives the valve to open, clear water that the filter screen top remained to the outlet pipe is as backwash water, can recoil the accumulative residue and the sludge below the filter screen, and discharge through the drain together with the deposited sludge in intake chamber bottom, thereby realize the self-cleaning of filter screen, need not to use the pump to backwash the filter screen, also need not the manual replacement and wash the filter screen, simple structure, multistage different filter fineness's filter equipment connects gradually, the filter precision is from low to high, relative with single filter equipment, multistage filtration system can improve filtration efficiency, increase filter effect.

Drawings

Other features and advantages of the utility model are seen in the following description, which explains the utility model in more detail on the basis of embodiments with reference to the drawings.

FIG. 1 is a cross-sectional view of a multi-stage filtration system according to an embodiment of the present utility model.

Fig. 2 is a partial enlarged view of the portion a of fig. 1.

Fig. 3 is a partial enlarged view of part B of fig. 1.

Fig. 4 is a partial enlarged view of the portion C in fig. 3.

Reference numerals illustrate:

a multi-stage filtration system 500;

a filtration device 100, a primary filtration device 100a, a medium filtration device 100b, and a high filtration device 100c;

the water treatment device comprises an outer shell 11, a clean water chamber 111, a water outlet 112, an inner shell 12, an inlet chamber 121, a filter screen 122', a filter screen 122", a filter hole 122a, a top 122b, a bottom 122c, an inlet pipe 123, a drain pipe 124, an inner wall 124a, an annular wall 124b, an annular wall center notch 124ba, an inner side surface 124bb, an upper peripheral wall 125, a top 125a, a lower peripheral wall 126, a bottom 126a, a converging opening 126b, a floating block 13, a valve 14, a rope 15, a water baffle 16, an upper side wall 161, a lower baffle 162, a pulley 17, a pulley 18, a bracket 19, a guide 191 and a through hole 191a.

Detailed Description

Preferred embodiments of the present utility model will be described below with reference to the accompanying drawings. It should be noted that the terms "upper", "lower", "left", "right", "front", "rear" and the like are used herein for illustrative purposes only and are not limiting of the present utility model.

Referring to fig. 1, an embodiment of the present utility model provides a multi-stage filtration system 500 comprising a plurality of filtration devices 100, the filtration devices 100 comprising: an outer housing 11 defining a clean water chamber 111 (as an example of a first chamber) and provided with a water outlet 112 from which sewage flows out after filtration is completed; an inner housing 12, wherein the inner housing 12 is accommodated in the clean water chamber 111 and defines an intake chamber 121 (as an example of a second chamber) together with the outer housing, in this embodiment, the upper and lower parts of the inner housing are respectively connected with the outer housing, the inner housing is connected with the outer housing and functions to fix the inner housing, a filter screen 122 is disposed on the inner housing, the filter screen 122 includes a plurality of filter holes 122a, the clean water chamber 111 is communicated with the intake chamber 121 through a plurality of filter holes 122a of the filter screen 122, a floating block 13 is disposed in the intake chamber 121, and the height of the water outlet 112 in the vertical direction is higher than that of the filter screen 122 and lower than that of the floating block 13; a water inlet pipe 123 communicating with the water inlet chamber 121, from which sewage is injected into the water inlet chamber; a drain pipe 124 which is communicated with the water inlet chamber 121 and comprises an inner wall 124a, and the filtered sludge and impurities remain in the water inlet chamber for cleaning and discharging after the sewage is injected into the water inlet chamber; the valve 14 is hinged with the inner wall 124a and is connected with the floating block 13 through a rope 15 to control the opening and closing of the drain pipe 124, and the floating block drives the rope to tighten and simultaneously pulls the valve to rotate in the drain pipe when ascending;

the filtering device 100 includes a filtering state in which the liquid level in the water inlet chamber 121 is lower than the floating block 13 and the valve 14 is closed, and a flushing state in which the liquid level in the water inlet chamber 121 is higher than the water outlet, the floating block rises and pulls the valve to open, and the filtering devices 100 are sequentially connected in a graded manner from low to high according to the filtering precision of the respective filter screens 122, and the water outlet 112 of the filter 100 is communicated with the water inlet pipe of the filtering device 100 at the next stage.

In this embodiment, the three filtering devices 100 with different filtering precision are included, and the three filtering devices include a primary filtering device 100a, a middle filtering device 100b and a high-level filtering device 100c sequentially from top to bottom, and the three filtering devices include respective filter screens 122, 122 'and 122", where the filtering precision of the filter screen 122 is the lowest, the filtering precision of the filter screen 122' is higher than that of the filter screen 122, and the filtering precision of the filter screen 122" is the highest.

As shown in fig. 1, the filtering device 100 includes a water baffle 16 disposed in the water inlet chamber 121, the water baffle 16 has an upper side wall 161 connected to the outer housing 11 and a lower baffle 162 connected to the upper side wall 161, the upper side wall 161 extends in a vertical direction, the lower baffle 162 inclines toward the inner housing 12 and leaves a gap with the inner housing 12, and the water baffle is disposed to buffer water flow after sewage is injected into the water inlet chamber from the water inlet pipe, so as to reduce impact of water flow, and avoid excessive impact of water to cause sludge and residues at the bottom of the water inlet chamber to turn up and affect filtering of the filter screen.

As shown in fig. 1, the inner housing 12 includes an upper peripheral wall 125 and a lower peripheral wall 126 connected to the outer housing 11, the filter screen 122 is obliquely connected between the upper peripheral wall 125 and the lower peripheral wall 126 and has a top 122b (as an example of a first top) and a bottom 122c (as an example of a first bottom), the top 122b is connected to the upper peripheral wall 125, the bottom 122c is connected to the lower peripheral wall 126, the filter screen 122, the upper peripheral wall 125, the lower peripheral wall 126 and the outer housing 11 together define an intake chamber 121, the inner housing is divided into upper and lower portions which are not connected, the middle is connected by the filter screen, and the peripheral walls are all connecting channels of a clean water chamber and the intake chamber, which is beneficial to improving the filtering efficiency of the device.

As shown in fig. 1, the upper peripheral wall 125 has a top 125a (as an example of a second top), and the top 125a is connected with a water inlet pipe 123 communicating the outside of the outer case 11 with the water inlet chamber 121. The lower peripheral wall 126 has a bottom 126a (as an example of a second bottom), and a drain pipe 124 communicating the outside of the outer case 11 with the intake chamber 121 is connected to the bottom 126 a. The longitudinal section of the lower peripheral wall 126 is reduced from top to bottom to form a converging port 126b, and the drain pipe 124 is connected to the converging port 126 b. The corner where the converging port 126b is connected with the drain pipe 124 is provided with a pulley 17, and the rope 15 is partially wound on the pulley 17. The inner wall of the drain pipe is also connected with a pulley 18, and the rope 15 is partially wound on the pulley 18.

As shown in fig. 1, the filtering apparatus 100 further includes a bracket 19 connected to the upper peripheral wall 125, the bracket 19 includes a guide portion 191, the guide portion 191 includes a through hole 191a extending in a vertical direction, one end of the rope 15 is connected to the valve 14, the other end is connected to the float 13 through the through hole 191a, and the top end of the guide portion 191 is higher than the water outlet 112.

As shown in fig. 1, the included angle between the filter screen 122 and the horizontal plane is 50 ° -85 °, in this embodiment, the included angle α1=70°, where the included angle α1 may be 50 °, 51 °, 52 °, 53 °, 54 °, 55 °, 56 °, 57 °, 58 °, 59 °, 60 °, 61 °, 62 °, 63 °, 64 °, 65 °, 66 °, 67 °, 68 °, 69 °, 71 °, 72 °, 73 °, 74 °, 75 °, 76 °, 77 °, 78 °, 79 °, 80 °, 81 °, 82 °, 83 °, 84 °, and 85 °, and a proper inclination angle is selected to facilitate improvement of the backwashing effect of the filter screen, where the backwashing effect is not good due to the excessive angle, and the water flowing into the fresh water chamber is affected due to the excessively small angle.

As shown in fig. 1 and 3, the drain pipe 124 is hollow and extends radially inward at a right end portion out of an annular wall 124b, and the annular wall 124b has an inner side surface 124bb and an outer side surface. Sludge and impurities are discharged from the central notch 124ba of the annular wall to the drain pipe 124, the valve plate 14 is arranged in the drain pipe, the upper end of the valve plate is hinged to the top of the annular wall 124b, the lower end of the valve plate is attached to the inner side surface 124bb of the bottom of the annular wall 124b, a sealing element is arranged between the annular wall and the valve plate, and the sealing element is arranged to prevent sewage in the drain pipe from leaking in a filtering state. The valve plate 14 is a circular thin plate, the outer diameter of the valve plate 14 is larger than the inner diameter of the annular wall central gap 124ba, and the inner diameter of the annular wall central gap 124ba is smaller than the inner diameter of the drain pipe 124.

As shown in FIG. 1, in this embodiment, the longitudinal section of the outer casing is rectangular, in the actual production and use process, the outer casing may be of a cylindrical structure as a whole, or may be a cuboid, so as to satisfy the hollow space to define the clean water chamber, the upper half of the longitudinal section of the inner casing is rectangular, the lower half is of an inverted cone shape, two side lines at the bottom of the cone shape are not intersected, in the actual production and use process, the inner casing is of a cylindrical preferred structure, the lower half is of an inverted cone shape, and the cone structure is favorable for water flow and sludge to collect at the bottom of the inner casing and discharge.

As shown in fig. 1, the outer housing has a top wall and a bottom wall, the bottom wall of the upper stage filter device being connected to the top wall of the lower stage filter device, and the three filter devices being stacked to form a multi-stage filtration system.

The mesh number of the filter screen 122 can be determined according to the filtering precision requirement, and the larger the mesh number is, the higher the filtering precision is. As shown in fig. 1, the filter screen 122 is a part of a conical structure without a top, the filter screen 122 has a longitudinal section of an isosceles trapezoid, the top 122b of the filter screen 150 can be fixed on the inner casing 12 by screws, and the bottom 122c of the filter screen 150 is connected with the lower peripheral wall.

In some embodiments, the junction of the screen 122 and the inner housing 12 is provided with a seal to prevent water from entering the clean water chamber without being filtered, affecting the filtering effect.

In some embodiments, the screen 122 is of annular configuration, i.e., the screen 122 is disposed horizontally, with the inner peripheral surface of the screen 122 coupled to the outer wall surface of the inner housing 12 and the outer peripheral surface of the screen 122 coupled to the defining outer housing 11. In other embodiments, the filter screen 12 may have a conical structure with a large top and a small bottom, i.e., the longitudinal section of the filter screen is an inverted isosceles trapezoid. It is understood that the angle between the outer wall surface of the filter screen 122 and the outer wall surface of the inner housing is greater than 0 degrees and less than 180 degrees.

In some embodiments, as shown in fig. 1 and 3, the baffle 16 includes an upper sidewall 161 and a lower baffle 162, and the top end of the upper sidewall 161 is connected to the outer housing, and the baffle 16 has a tapered structure with a smaller top and a larger bottom.

The operation of the multi-stage filtration system 500 according to the present utility model will be described below, in which the multi-stage filtration system 500 includes three filtration devices 100, namely, a primary filtration device 100a, a middle-stage filtration device 100b and a high-stage filtration device 100c in this order from top to bottom, wherein the filtration accuracy of the primary filtration device 100a is the lowest, the filtration accuracy of the middle-stage filtration device 100b is higher than that of the primary filtration device, and the filtration accuracy of the high-stage filtration device 100c is the highest. When the multi-stage filtration system provided by the utility model is used for filtering sewage, the sewage is injected into the primary filtration device 100a, the sewage enters the water inlet chamber, at the moment, the filtration device is in a filtration state, the valve in the sewage drain pipe is closed, the liquid level in the water inlet chamber is increased after the sewage enters the water inlet chamber, water flows into the clean water chamber from the water inlet chamber after reaching the height of the filter screen, impurities and sludge are filtered and remain on the filter screen, the purified clean water enters the clean water chamber to cause the liquid level in the clean water chamber to be increased, the clean water flows out of the water outlet after reaching the height of the water outlet, and in a normal filtration state, the liquid level in the clean water chamber and the water inlet chamber is equal, the water yield of clean water room equals with the water injection rate of intake chamber, after the filter screen is blocked gradually because of the impurity, the water yield of clean water room is less than the water injection rate of intake chamber, the water passing efficiency of filter screen reduces, the liquid level in the intake chamber risees, the floating block that sets up in the intake chamber rises along with the liquid level and drags the rotation of rope other end valve, the blow off pipe communicates with the outside, mud and rivers flow in the intake chamber follow the blow off pipe, the clear water in the clean water room flows back into the intake chamber from filter screen, back flush filter screen, after the rivers in filter equipment descends gradually, the floating block gets back to initial height, the valve is closed under the impact of rivers, primary filter equipment accomplishes the self-flushing of filter screen this moment.

The clear water of the primary filter device flows out of the water outlet and then flows into the water inlet pipe of the intermediate filter device, the clear water of the intermediate filter device flows out of the water outlet and then flows into the water inlet pipe of the advanced filter device, finally flows out of the water outlet pipe after the filtration is completed in the advanced filter device, the three filter devices have the same structure except the different filtration precision of the filter screen, and the self-flushing principle and the action process of the filter screen are also the same.

Through the multistage filtration system that this embodiment provided, need not to use the machine pump to wash the filter screen backward, also need not the manual replacement and wash the filter screen, filter equipment can accomplish automatically and wash the filter screen, simple structure, the operation of being convenient for and the practicality is strong, multistage filter equipment's precision improves gradually, multistage filtration can improve filtration efficiency, also better for single filter equipment filter effect.

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

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, one skilled in the art can combine and combine the different embodiments or examples described in this specification.

While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the utility model.

Claims (10)

1. A multi-stage filtration system comprising a plurality of filtration devices (100), the filtration devices (100) comprising:

an outer housing (11) defining a first chamber (111) and provided with a water outlet (112);

the inner shell (12), the inner shell (12) is accommodated in the first chamber (111) and is connected with the outer shell to jointly define a second chamber (121), a filter screen (122) is arranged on the inner shell, the first chamber (111) and the second chamber (121) are communicated through the filter screen (122), a floating block (13) is arranged in the second chamber (121), and the water outlet (112) is higher than the filter screen (122) and lower than the floating block (13);

-a water inlet pipe (123), said water inlet pipe (123) communicating with said second chamber (121);

-a drain pipe (124), the drain pipe (124) being in communication with the second chamber (121) and comprising an inner wall (124 a); and

a valve (14), wherein the valve (14) is hinged with the inner wall (124 a) and is connected with the floating block (13) through a rope (15);

the filtering device (100) comprises a filtering state and a flushing state, the liquid level in the second chamber (121) is lower than that of the floating block (13) and the valve (14) is closed, the liquid level in the second chamber (121) is higher than that of the water outlet in the flushing state, the floating block is lifted and pulls the valve to be opened, the filtering devices (100) are sequentially connected in a grading manner from low to high according to the filtering precision of the respective filter screen (122), and the water outlet (112) of the filtering device (100) at the upper stage is communicated with the water inlet pipe of the filtering device (100) at the lower stage.

2. The multistage filtration system according to claim 1, wherein the filtration device (100) comprises a water deflector (16) disposed within the second chamber (121), the water deflector (16) having an upper side wall (161) connected to the outer housing (11) and a lower baffle (162) connected to the upper side wall (161), the upper side wall (161) extending in a vertical direction, the lower baffle (162) being inclined towards the inner housing (12) with a gap left between the inner housing (12).

3. The multi-stage filtration system of claim 2, wherein the inner housing (12) comprises an upper perimeter wall (125) and a lower perimeter wall (126) connected to the outer housing (11), the screen (122) being disposed obliquely between the upper perimeter wall (125) and the lower perimeter wall (126) and having a first top (122 b) and a first bottom (122 c), the first top (122 b) being connected to the upper perimeter wall (125), the first bottom (122 c) being connected to the lower perimeter wall (126), the screen (122), the upper perimeter wall (125), the lower perimeter wall (126) and the outer housing (11) together defining a second chamber (121).

4. A multi-stage filtration system according to claim 3, wherein the upper peripheral wall (125) has a second top (125 a), the second top (125 a) being connected with a water inlet pipe (123) communicating the outside of the outer housing (11) with the second chamber (121).

5. The multistage filtration system according to claim 4, wherein the lower peripheral wall (126) has a second bottom (126 a), the second bottom (126 a) being connected with a drain (124) communicating the outside of the outer housing (11) with the second chamber (121).

6. The multiple stage filtration system of claim 5, wherein the lower peripheral wall (126) tapers in longitudinal cross-section from top to bottom to form a converging port (126 b), the drain tube (124) being connected to the converging port (126 b).

7. The multistage filtration system according to claim 6, wherein a first pulley (17) is provided at a corner of the converging port (126 b) connected to the drain pipe (124), and the rope (15) is partially wound around the pulley (17).

8. The multistage filtration system according to claim 7, wherein a second pulley (18) is further connected to the inner wall of the drain pipe, and the rope (15) is partially wound around the second pulley (18).

9. The multistage filtration system according to claim 8, further comprising a bracket (19) connected to the upper peripheral wall (125), the bracket (19) comprising a guide portion (191), the guide portion (191) comprising a through hole (191 a) extending in a vertical direction, the rope (15) having one end connected to the valve (14) and the other end connected to the float (13) through the through hole (191 a), and a top end of the guide portion (191) being higher than the water outlet (112).

10. A multi-stage filtration system according to claim 3, wherein the screen (122) is at an angle of between (60 ° -80 °) to the horizontal.