A non-powered microfilter for mandarin fish farming

Abstract

The utility model provides a non-powered microfilter for mandarin fish breeding, comprising a connecting pipe, an impeller driving assembly, a frame, a drum and a backwashing device; the drum is movably arranged in the frame and connected to the impeller driving assembly, one or more filtering devices are arranged on the side wall of the drum, one or more supporting wheels are respectively arranged at both ends of the frame, the supporting wheels extend into the drum, the supporting wheels abut against the inner wall of the drum along the radial direction of the drum, the rotation direction of the supporting wheels is consistent with the rotation direction of the drum, so as to improve the stability of the supporting drum; a collecting device is arranged in the drum, the collecting device is fixed on the frame, and the backwashing device is arranged on the outside of the drum and is arranged opposite to the collecting device; the connecting pipe is connected to the impeller driving assembly and the backwashing device at the same time, the liquid output by the connecting pipe can drive the impeller driving assembly to move, and can also provide water flow for the backwashing device, and the backwashing device outputs water flow to backwash the filtering device.

Description

Technical Field

[0001] The utility model relates to the technical field of microfilters, in particular to a non-powered microfilter for mandarin fish breeding. Background Art

[0002] Microfilter is a mechanical filter that uses a microporous screen to intercept solid particles with larger particle sizes in aquaculture wastewater to achieve the purpose of solid-liquid separation. Existing microfilters are generally driven by electric motors, reducers, chains or gears. When treating seawater in an extremely humid environment, it is very easy to be corroded, causing the microfilter to fail to work properly, requiring a lot of maintenance and high energy consumption.

[0003] A patent document in China with application number 202222737346.2 and publication date 2023.1.24 discloses an unpowered microfilter used for MBR pretreatment, comprising: a pair of bearings, the inner rings of the pair of bearings are fixed on an external frame; a filter frame, the two ends of the filter frame are respectively connected to the outer rings of a pair of bearings, and a filter is provided on the filter frame; a flushing module, the flushing module is located at the top of the filter frame, and is used to flush impurities on the filter; a water inlet drive module, the water inlet drive module is connected to one end of the filter frame, and is used to transport sewage into the filter frame and drive the filter frame to rotate; a slag discharge module, the slag discharge module is connected to the other end of the filter frame, and is used to discharge impurities flushed away by the flushing module.

[0004] The impact elbow and flushing nozzle of the microfilter are respectively connected to different water pipes. The filter frame is driven to rotate by one water flow, and the filter is flushed by another water flow, which consumes a lot of water resources. At the same time, the filter frame is connected to the outer ring of the bearing, and the supporting strength of the filter frame in the radial direction is small. The filter frame is connected to the impeller assembly, and the impeller assembly needs to bear the weight of the filter frame when driving the filter frame to rotate, which will affect the transmission torque of the impeller assembly on the filter frame, and the impeller assembly is prone to deformation. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide a non-powered microfiltration machine for mandarin fish farming, which is connected to an impeller drive assembly and a backwashing device at the same time through a connecting pipe. The liquid output by the connecting pipe can not only drive the impeller drive assembly to move, but also provide water flow for the backwashing device. The backwashing device outputs water flow to backwash the filter device, which can save water resources; the drum is supported by a supporting wheel to improve the stability of the supporting drum, and at the same time does not affect the transmission torque provided to the drum by the impeller drive assembly.

[0006] In order to solve the above technical problems, the technical solution used in the utility model is: a non-powered microfilter for mandarin fish farming, comprising a connecting pipe, an impeller drive assembly, a frame, a drum and a backwashing device; the drum is movably arranged in the frame and connected to the impeller drive assembly, one or more filtering devices are provided on the side wall of the drum, and one or more supporting wheels are respectively provided at both ends of the frame, the supporting wheels extend into the drum, the supporting wheels abut against the inner wall of the drum along the radial direction of the drum, and the rotation direction of the supporting wheels is consistent with the rotation direction of the drum; a collecting device is provided in the drum, the collecting device is fixed on the frame, and the backwashing device is arranged on the outside of the drum and opposite to the collecting device; the connecting pipe is connected to the impeller drive assembly and the backwashing device, and the water flow input by the connecting pipe is used to drive the impeller drive assembly to move and provide backwashing liquid for the backwashing device.

[0007] Preferably, the connecting pipe includes a joint and a reducer, the input end of the joint is used to input a water source, the first output end of the joint is connected to the impeller drive assembly, the second output end of the joint is connected to the input end of the reducer, the output end of the reducer is connected to the backwashing device, and the width of the output end of the reducer is smaller than the width of the input end of the reducer.

[0008] Preferably, the impeller drive assembly comprises a housing, in which an impeller is arranged, and the impeller is connected to the drum via a transmission shaft.

[0009] Preferably, the collecting device includes a first plate body and a second plate body, and a first baffle is provided at one end of the first plate body and one end of the second plate body; a second baffle is provided at the other end of the first plate body and the other end of the second plate body, and the first plate body, the second plate body, the first baffle and the second baffle are surrounded to form a collecting groove, and the opening of the collecting groove is inclined upward; a discharge pipe is provided in the second plate body, and the discharge pipe is connected to the collecting groove.

[0010] Preferably, the filter device includes a fixed seat, a filter screen and a pressure plate; the fixed seat includes a first mounting portion and a first pressing portion, and one or more first through holes are provided in the first pressing portion; the pressure plate includes a second mounting portion and a second pressing portion, and one or more second through holes are provided on the second pressing portion; the first mounting portion and the second mounting portion are detachably connected, the filter screen is located between the first pressing portion and the second pressing portion, the first pressing portion and the second pressing portion cover the entire filter screen and abut against the filter screen, and the first through hole and the second through hole are both connected to the filter holes of the filter screen.

[0011] Preferably, the first clamping portion includes a first frame and a first filter bracket, the first frame forms a first cavity, the first filter bracket is arranged in the first cavity and connected to the peripheral wall of the first frame, and one or more first through holes are provided between the first filter bracket and the edge of the first frame and in the first filter bracket.

[0012] Preferably, the second clamping portion includes a second frame and a second filter bracket, the second frame forms a second cavity, the second filter bracket is arranged in the second cavity and connected to the peripheral wall of the second frame, and one or more second through holes are provided between the second filter bracket and the edge of the second frame and in the second filter bracket.

[0013] Preferably, the first through hole extends from the bottom of the first pressing portion to the top of the first pressing portion; and the second through hole extends from the bottom of the second pressing portion to the top of the second pressing portion.

[0014] Preferably, the first pressing portion is recessed in a direction away from the second pressing portion; and the second pressing portion is protruded in a direction close to the first pressing portion.

[0015] Compared with the prior art, the beneficial effects of the non-powered microfilter for mandarin fish farming described in the utility model are mainly reflected in:

[0016] The impeller drive assembly and the backwash device are both connected to the connecting pipe. The liquid output by the connecting pipe can not only drive the impeller drive assembly to move, but also provide water flow for the backwash device. The backwash device outputs water flow to backwash the filter device, which can save water resources and reduce water resource consumption. At the same time, the collecting device is arranged opposite to the backwash device, and the collecting device receives the particles that have separated from the filter. The two ends of the drum are supported by the supporting wheels, and the force is evenly applied. The impeller drive assembly only needs to provide transmission torque to the drum, and the impeller drive assembly does not need to bear the weight pressure of the drum; at the same time, the rotation direction of the supporting wheel is consistent with the rotation direction of the drum, and will not interfere with the rotation of the drum.

[0017] By reducing the width of the reducer and increasing the pressure of water flowing through the reducer, the water flow output from the joint is pressurized, so that the backwashing device outputs high-pressure water flow to backwash the filter, and the flushing effect is good; at the same time, the pressure of the water flow is increased under the action of the reducer, so there is no need to set up an additional booster pump, thereby reducing the energy consumption of the microfilter.

[0018] In the collecting device, the particles separated from the filter are accommodated by the collecting trough, the opening of the collecting trough is tilted upward to prevent the particles from falling out of the opening of the collecting trough, and a discharge pipe is provided to discharge solid impurities.

[0019] In the filter device, the first pressing part and the second pressing part cover the entire filter screen, and the first pressing part and the second pressing part are in contact with the entire filter screen, which has a good fixing effect on the filter screen. Along the filtering direction of the filter screen and the opposite direction of the filtering direction, the first pressing part and the second pressing part support the filter screen, thereby preventing the filter screen from being deformed when the water flow impacts the filter screen.

[0020] A plurality of first through holes are formed in the first pressing part, and a plurality of second through holes are formed in the second pressing part; both the first through holes and the second through holes are connected to the filter holes of the filter net, so that the filter net support strength is improved without affecting the filtering effect. At the same time, the length of the first through hole is the same as the length of the first pressing part, and the length of the second through hole is the same as the length of the second pressing part.

[0021] When the filter is backwashed, the particles attached to the filter move away from the filter along the length direction of the first through hole and the length direction of the second through hole, and the particles are guided by the inner wall of the first through hole and the inner wall of the second through hole. Since the length of the first through hole is the same as the length of the first pressing part, and the length of the second through hole is the same as the length of the second pressing part, the first filter bracket and the second filter bracket can block the particles that have escaped from the filter, thereby preventing the particles that have escaped from the filter from being washed to other areas of the filter by the water flow.

[0022] By providing a raised second pressing portion to cooperate with the recessed first pressing portion, the fixing effect of the filter screen is improved.

[0023] The utility model connects the impeller drive assembly and the backwashing device at the same time through a connecting pipe. The liquid output by the connecting pipe can not only drive the impeller drive assembly to move, but also provide water flow for the backwashing device. The backwashing device outputs water flow to backwash the filter device, which can save water resources. The drum is supported by the supporting wheel to improve the stability of the supporting drum, and at the same time does not affect the transmission torque provided to the drum by the impeller drive assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and other purposes, features and advantages of the present invention will become more apparent through a more specific description of the preferred embodiments of the present invention shown in the accompanying drawings. The same reference numerals in all the accompanying drawings indicate the same parts, and the drawings are not intentionally scaled to the actual size, but the focus is on illustrating the subject matter of the present invention.

[0025] Figure 1 It is a three-dimensional schematic diagram of the utility model.

[0026] Figure 2 It is a front view of the utility model.

[0027] Figure 3 It is a three-dimensional schematic diagram of the collecting device in the utility model.

[0028] Figure 4 It is a schematic diagram of the connection between the impeller and the drum in the utility model.

[0029] Figure 5 It is a schematic diagram of the filtering device in the utility model.

[0030] Figure 6for Figure 5 Sectional view of AA.

[0031] Figure 7 for Figure 6 Cross-sectional view after the middle fixing seat and the pressure plate are separated.

[0032] Figure 8 for Figure 7 Enlarged view of B.

[0033] Fig. 9 It is a three-dimensional schematic diagram of the fixing seat in the utility model.

[0034] Fig.10 It is a three-dimensional schematic diagram of the medium pressure plate of the utility model.

[0035] Description of the drawings: frame 1, drum 2, backwashing device 3, collecting device 4, impeller drive assembly 5, connecting pipe 6, filtering device 7, supporting wheel 8, backwashing pipeline 31, backwashing nozzle 32, collecting tank 40, first plate body 41, second plate body 42, first baffle 43, second baffle 44, discharge pipe 45, housing 51, impeller 52, transmission shaft 53, joint 61, reducer 62, fixing seat 71, pressing plate 72, fixing frame 73, joint The input end 611 of the connector, the first output end 612 of the connector, the second output end 613 of the connector, the first mounting portion 711, the first clamping portion 712, the first through hole 713, the first frame 714, the first filter bracket 715, the second mounting portion 721, the second clamping portion 722, the second through hole 723, the second frame 724, the second filter bracket 725, the fixing hole 731, the first through hole 7111, the second through hole 7211, and the limiting hole 7212. DETAILED DESCRIPTION

[0036] The technical scheme of the utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the utility model and implement it, but the examples given are not intended to limit the utility model. In the present embodiments, it should be understood that the orientations or positional relationships indicated by terms such as "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", and "outside" are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the utility model, 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 utility model.

[0037] It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to the other element and integrated therewith, or there may be an intermediate element at the same time. The terms "installed", "one end", "the other end" and similar expressions used in this utility model are for illustrative purposes only.

[0038] This embodiment provides a non-powered microfiltration machine for mandarin fish farming, such as Figures 1 to 10 As shown, it includes a frame 1, a drum 2, a backwashing device 3, a collecting device 4, an impeller drive assembly 5 and a connecting pipe 6; the drum 2 is movably arranged in the frame 1 and connected to the impeller drive assembly 5, one or more mounting openings 21 are provided on the side wall of the drum 2, the mounting openings 21 communicate with the outside of the drum and the inside of the drum, and a filtering device 7 is provided on the outside of each mounting opening 21, the collecting device 4 is fixed on the frame 1, the backwashing device 3 is arranged on the outside of the drum 2 and is arranged opposite to the collecting device 4; the collecting device 4 is arranged opposite to the backwashing device 3, and the collecting device 4 receives the particulate matter separated from the filter screen.

[0039] The connecting pipe 6 is connected to the impeller drive assembly 5 and the backwashing device 3. The water flow input by the connecting pipe 6 is used to drive the impeller drive assembly 5 to move and provide backwashing liquid for the backwashing device 3. The liquid output by the connecting pipe can not only drive the impeller drive assembly 5 to move, but also provide water flow for the backwashing device 3. The backwashing device 3 outputs water flow to backwash the filter device 7, which can save water resources and reduce water resource consumption.

[0040] One or more supporting wheels 8 are respectively provided at both ends of the frame 1, and the supporting wheels 8 extend into the drum 2, and the supporting wheels 8 abut against the inner wall of the drum 2 along the radial direction of the drum 2, and the rotation direction of the supporting wheels 8 is consistent with the rotation direction of the drum 2. The two ends of the drum 2 are supported by the supporting wheels 8, and the force is evenly applied, and the impeller driving assembly 5 only needs to provide transmission torque to the drum 2, and the impeller driving assembly 5 does not need to bear the weight pressure of the drum 2; at the same time, the rotation direction of the supporting wheels 8 is consistent with the rotation direction of the drum 2, and will not interfere with the rotation of the drum 2.

[0041] The connecting pipe 6 includes a joint 61 and a reducer 62, the input end 611 of the joint is used to input a water source, the first output end 612 of the joint is connected to the impeller drive assembly 5, the second output end 613 of the joint is connected to the input end of the reducer 62, the output end of the reducer 62 is connected to the backwashing device 3, and the width of the output end of the reducer 62 is smaller than the width of the input end of the reducer 62. By reducing the width of the reducer 62, the pressure of the water flow when passing through the reducer 62 is increased, and the water flow output by the joint 61 is pressurized, so that the backwashing device 3 outputs a high-pressure water flow to backwash the filter screen, and the flushing effect is good; at the same time, the pressure of the water flow is increased under the action of the reducer 62, so that there is no need to set up an additional booster pump, thereby reducing the energy consumption of the microfilter.

[0042] In a preferred embodiment, the input end 611 of the connector is connected to a biological filter tank located at a high position. By utilizing the height difference between the biological filter tank and the microfiltration machine, the water flow output from the biological filter tank is input into the impeller drive assembly 5 and the backwash device 3 for use.

[0043] The collecting device 4 comprises a first plate body 41 and a second plate body 42, wherein a first baffle 43 is provided at one end of the first plate body 41 and one end of the second plate body 42; a second baffle 44 is provided at the other end of the first plate body 41 and the other end of the second plate body 42; the first plate body 41, the second plate body 42, the first baffle 43 and the second baffle 44 surround and form a collecting tank 40, and the opening of the collecting tank 40 is arranged to be inclined upward; a discharge pipe 45 is provided in the second plate body 42, and the discharge pipe 45 is communicated with the collecting tank 40. The collecting tank 40 accommodates the particles separated from the filter screen, and the opening of the collecting tank 40 is arranged to be inclined upward to prevent the particles from falling off from the opening of the collecting tank 40, and the discharge pipe 45 is provided to discharge solid impurities.

[0044] The backwashing device 3 includes a backwashing pipe 31 and one or more backwashing nozzles 32, and the one or more backwashing nozzles 32 are arranged on the backwashing pipe 31 at intervals along the length direction of the backwashing pipe 31. Water flows through the backwashing pipe 31 and flows into the backwashing nozzles 32. The spraying direction of the backwashing nozzles 32 is arranged opposite to the opening direction of the collecting tank 40. The backwashing pipe 31 and the backwashing nozzles 32 are prior arts and are not described here.

[0045] The impeller drive assembly 5 includes a housing 51, in which an impeller 52 is arranged. The impeller 52 is connected to the drum 2 via a transmission shaft 53. The first output end 612 of the joint is connected to the housing 51. Water flow is input into the housing 51 to drive the impeller 52 to rotate. The impeller 52 drives the drum 2 to rotate via the transmission shaft 53.

[0046] In this embodiment, unfiltered liquid is input into the drum 2, and the unfiltered liquid acts on the filtering device 7 to output filtered liquid to the outside.

[0047] The filtering device includes a fixing seat 71, a filter screen (not shown in the figure) and a pressing plate 72; the fixing seat 71 includes a first mounting portion 711 and a first pressing portion 712, and one or more first through holes 713 are provided in the first pressing portion 712; the pressing plate 72 includes a second mounting portion 721 and a second pressing portion 722, and one or more second through holes 723 are provided in the second pressing portion 722; the first mounting portion 711 and the second mounting portion 721 are detachably connected, the filter screen is located between the first pressing portion 712 and the second pressing portion 722, and the first through holes 713 and the second through holes 723 are both connected to the filter holes of the filter screen.

[0048] The first pressing part 712 and the second pressing part 722 cover the entire filter screen and abut against the filter screen. The first pressing part 712 and the second pressing part 722 are in contact with the entire filter screen, and have a good fixing effect on the filter screen. Along the filtering direction of the filter screen and the opposite direction of the filtering direction, the first pressing part 712 and the second pressing part 722 support the filter screen, thereby preventing the filter screen from being deformed when the water flow impacts the filter screen.

[0049] In this embodiment, the first pressing portion 712 is recessed away from the second pressing portion 722, and the second pressing portion 722 is raised toward the first pressing portion 712. By providing the raised second pressing portion 722 to cooperate with the recessed first pressing portion 712, the fixing effect of the filter screen is improved.

[0050] The first pressing part 712 includes a first frame 714 and a first filter support 715. The first frame 714 is surrounded by a first cavity. The first filter support 715 is arranged in the first cavity and connected to the peripheral wall of the first frame 714. One or more first through holes 713 are provided between the first filter support 715 and the edge of the first frame 714 and in the first filter support 715. The second pressing part 722 includes a second frame 724 and a second filter support 725. The second frame 724 is surrounded by a second cavity. The second filter support 725 is arranged in the second cavity and connected to the peripheral wall of the second frame 724. One or more second through holes 723 are provided between the second filter support 725 and the edge of the second frame 724 and in the second filter support 725.

[0051] In a preferred embodiment, the first through hole 713 extends from the bottom of the first pressing part 712 to the top of the first pressing part 712. The second through hole 723 extends from the bottom of the second pressing part 722 to the top of the second pressing part 722. A plurality of first through holes 713 are formed in the first pressing part 712, and a plurality of second through holes 723 are formed in the second pressing part 722; both the first through holes 713 and the second through holes 723 are connected to the filter holes of the filter screen, so that the filter screen support strength is improved without affecting the filtering effect.

[0052] When the filter is flushed, the medium-sized particles attached to the filter move away from the filter along the length direction of the first through hole 713 and the length direction of the second through hole 723, and the particles are guided by the inner wall of the first through hole 713 and the inner wall of the second through hole 723. Since the length of the first through hole 713 is the same as the length of the first clamping part 712, and the length of the second through hole 723 is the same as the length of the second clamping part 722, the first filter bracket 715 and the second filter bracket 725 can block the particles that have escaped from the filter, thereby preventing the particles that have escaped from the filter from being washed to other areas of the filter by the water flow.

[0053] A fixing frame 73 is provided outside the fixing seat 71 , and more than two fixing holes 731 are provided on the fixing frame 73 . The fixing holes 731 are used to install the fixing seat 71 . The installation of the filter device is achieved through the fixing frame 3 .

[0054] A first through hole 7111 is provided on the first mounting portion 711, a second through hole 7211 is provided on the second mounting portion 721, and a locking device (not shown) connects the first through hole 7111 and the second through hole 7211. The locking device realizes a detachable connection between the first mounting portion 711 and the second mounting portion 721.

[0055] In a preferred embodiment, the locking device includes a bolt (not shown in the figure) and a nut (not shown in the figure), and the bolt passes through the first through hole 7111 and the second through hole 7211 and is threadedly connected to the nut.

[0056] In another preferred embodiment, a limiting hole 7212 is provided on one side of the second through hole 7211, the limiting hole 7212 is communicated with the second through hole 7211, the nut is disposed in the limiting hole 7212, and the limiting hole 7212 is used to limit the movement of the nut. The limiting hole 7212 is a hexagonal hole, and the inner wall of the limiting hole 7212 abuts against the outer wall of the nut.

[0057] In another preferred embodiment, the locking device is a bolt, the second through hole 7211 is a threaded hole, and the locking device passes through the first through hole 7111 and is threadedly connected to the second through hole 7211 .

[0058] The installation method of the filter device 7 is to place the filter screen on the first pressing part 712 which is set in a concave manner, and then align the second mounting part 721 with the first mounting part 711, connect the fixing seat 71 and the pressing plate 72, and the second pressing part 722 extends into the first pressing part 712 to fix the filter screen on the first pressing part 712. Then, the filter device 7 is installed on the frame 1 through the fixing hole 731.

[0059] The working principle of the utility model is as follows: water flow is input into the input end 611 of the joint, and a water flow is input into the impeller drive assembly 5 through the first output end 612 of the joint to drive the impeller 52 to rotate, and the rotation of the impeller 52 drives the drum 2 to rotate; unfiltered liquid is input into the drum 2 through a pipeline, the water level of the unfiltered liquid is lower than the horizontal height of the collecting device 4, and the unfiltered liquid flows through the filtering device 7 to be discharged outward.

[0060] When backwashing the filter device 7, the backwashing device 3 is opened, and another water flows through the second output end 613 of the connector and is input into the backwashing device 3. The backwashing nozzle 32 outputs liquid to backwash the filter device 7, flushing the particles attached to the filter net into the collecting device 4, and then the collecting device 4 is discharged.

[0061] In this specification, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0062] In the description of this specification, the description with reference to the terms "preferred embodiment", "further embodiment", "other embodiments" or "specific example" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0063] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A non-powered microfiltration machine for mandarin fish farming, characterized in that: It includes a connecting pipe, an impeller driving assembly, a frame, a drum and a backwashing device; the drum is movably arranged in the frame and connected to the impeller driving assembly, one or more filtering devices are arranged on the side wall of the drum, and one or more supporting wheels are respectively arranged at both ends of the frame, the supporting wheels extend into the drum, the supporting wheels abut against the inner wall of the drum along the radial direction of the drum, and the rotation direction of the supporting wheels is consistent with the rotation direction of the drum; a collecting device is arranged in the drum, the collecting device is fixed on the frame, and the backwashing device is arranged on the outside of the drum and opposite to the collecting device; the connecting pipe is connected to the impeller driving assembly and the backwashing device, and the water flow input by the connecting pipe is used to drive the impeller driving assembly to move and provide backwashing liquid for the backwashing device.

2. The unpowered microfilter for mandarin fish farming according to claim 1, characterized in that: The connecting pipe includes a joint and a reducer, the input end of the joint is used to input a water source, the first output end of the joint is connected to the impeller drive assembly, the second output end of the joint is connected to the input end of the reducer, the output end of the reducer is connected to the backwashing device, and the width of the output end of the reducer is smaller than the width of the input end of the reducer.

3. The unpowered microfilter for mandarin fish farming according to claim 1, characterized in that: The impeller driving assembly comprises a housing, in which an impeller is arranged, and the impeller is connected to the drum via a transmission shaft.

4. The unpowered microfilter for mandarin fish farming according to claim 1, characterized in that: The collecting device includes a first plate body and a second plate body, a first baffle is provided at one end of the first plate body and one end of the second plate body; a second baffle is provided at the other end of the first plate body and the other end of the second plate body, the first plate body, the second plate body, the first baffle and the second baffle are surrounded to form a collecting groove, and the opening of the collecting groove is inclined upward; a discharge pipe is provided in the second plate body, and the discharge pipe is connected to the collecting groove.

5. The non-powered microfilter for mandarin fish farming according to claim 1, characterized in that: The filter device includes a fixed seat, a filter screen and a pressure plate; the fixed seat includes a first mounting portion and a first pressing portion, and one or more first through holes are provided in the first pressing portion; the pressure plate includes a second mounting portion and a second pressing portion, and one or more second through holes are provided on the second pressing portion; the first mounting portion and the second mounting portion are detachably connected, the filter screen is located between the first pressing portion and the second pressing portion, the first pressing portion and the second pressing portion cover the entire filter screen and abut against the filter screen, and the first through hole and the second through hole are both connected to the filter holes of the filter screen.

6. The non-powered microfilter for mandarin fish farming according to claim 5, characterized in that: The first clamping portion includes a first frame and a first filter bracket. The first frame forms a first cavity. The first filter bracket is arranged in the first cavity and connected to the peripheral wall of the first frame. At least one first through hole is provided between the first filter bracket and the edge of the first frame and in the first filter bracket.

7. The non-powered microfilter for mandarin fish farming according to claim 6, characterized in that: The second pressing portion includes a second frame and a second filter bracket, the second frame forms a second cavity, the second filter bracket is arranged in the second cavity and connected to the peripheral wall of the second frame, and one or more second through holes are provided between the second filter bracket and the edge of the second frame and in the second filter bracket.

8. The non-powered microfilter for mandarin fish farming according to claim 7, characterized in that: The first through hole extends from the bottom of the first pressing part to the top of the first pressing part; the second through hole extends from the bottom of the second pressing part to the top of the second pressing part.

9. The non-powered microfilter for mandarin fish farming according to claim 5, characterized in that: The first pressing portion is recessed in a direction away from the second pressing portion; the second pressing portion is protruded in a direction close to the first pressing portion.

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