A fish farming device for slimming fish

Abstract

This utility model discloses a fish farming device for slimming fish, relating to the field of aquaculture equipment technology. It includes a farming pond and a multi-stage filter barrel. The multi-stage filter barrel comprises a first filter grid, a second filter grid, a third filter grid, and a fourth filter grid arranged sequentially along the water flow direction. The first filter grid is higher than the second, third, and fourth filter grids, which are at the same height. The first filter grid has an inlet located at its upper end, higher than the second filter grid. The fourth filter grid has an outlet. The multi-stage filter barrel is positioned above one side of the farming pond, with the outlet diameter larger than the inlet diameter. This invention solves the problems of water overflow caused by uniform filter grid heights, unreasonable inlet and outlet pipe diameter design, and energy waste and low efficiency due to poor coordination with the water pump in current aquaculture devices.

Description

Technical Field

[0001] This utility model relates to the field of aquaculture equipment technology, and in particular to a breeding device for slender fish. Background Technology

[0002] In the lean fish farming industry, excellent water quality is a core element for ensuring the healthy growth of fish and the profitability of aquaculture. The performance of multi-stage filter canisters, a key piece of equipment for water purification, directly determines the purification effect. However, current multi-stage filter canisters on the market have many prominent drawbacks. These problems seriously restrict the high-quality development of the lean fish farming industry and make it difficult to meet the stringent requirements for water quality stability and cleanliness in high-quality lean fish farming.

[0003] In terms of structural design, the existing multi-stage filter canisters all have the same height, a design flaw that poses significant risks in actual use. When water is pumped in for filtration, if fish waste, uneaten food, and other debris accumulate and obstruct the water flow, the water level in the first filter canister will rise rapidly and easily overflow from the top of the canister. This not only pollutes the surrounding environment but also interrupts the filtration process, significantly reducing water purification efficiency and severely impacting the stability of the aquaculture system.

[0004] Traditional canister filters also suffer from inconsistencies in their inlet and outlet pipe diameter design and their compatibility with water pumps. The pipe diameter design lacks scientific consideration; either the inlet and outlet pipes have the same diameter, leading to poor water flow and low filtration efficiency, or the pipe diameter is incompatible with the different power requirements of pumping and gravity drainage, resulting in energy waste or poor drainage. Furthermore, when used in conjunction with a water pump, due to structural and flow design issues, even with a 50-watt pump, the flow must be controlled at a lower setting, leading to inefficient energy utilization and increased aquaculture costs. Utility Model Content

[0005] Based on this, and in response to the above problems, this utility model proposes a fish farming device for slimmer fish, which solves the problems of water overflow caused by the uniform height of the filter chambers in the current farming devices, unreasonable design of the inlet and outlet pipe diameters, and energy waste and low efficiency caused by poor coordination with the water pump.

[0006] The technical solution of this utility model is:

[0007] A fish farming apparatus for slimmer fish includes:

[0008] Aquaculture ponds are used for raising lean fish.

[0009] A multi-stage filter canister includes a first filter compartment, a second filter compartment, a third filter compartment, and a fourth filter compartment arranged sequentially along the water flow direction. The first filter compartment, the second filter compartment, the third filter compartment, and the fourth filter compartment are fixedly connected in sequence. The first filter compartment is higher than the second filter compartment, the third filter compartment, and the fourth filter compartment are at the same height. The first filter compartment has an inlet that is connected to the inside of the first filter compartment and is located at the top of the first filter compartment, higher than the second filter compartment. The fourth filter compartment has an outlet that is connected to the inside of the fourth filter compartment and is located at the top of the fourth filter compartment. The multi-stage filter canister is set above one side of the aquaculture pond. The inlet and outlet of the multi-stage filter canister are connected to the aquaculture pond through a water circulation component. The diameter of the outlet is larger than the diameter of the inlet.

[0010] The lower ends of the first and second filter cells are connected through the first connecting port, the upper ends of the second and third filter cells are connected through the second connecting port, and the lower ends of the third and fourth filter cells are connected through the third connecting port.

[0011] Preferably, the aquaculture pond is equipped with a drainage pipe, one end of which is located inside the aquaculture pond and the other end extends through the bottom of the aquaculture pond to the outside of the aquaculture pond. The drainage pipe is fixed and sealed to the bottom of the aquaculture pond, and several drainage holes are provided on the end of the drainage pipe located inside the aquaculture pond.

[0012] Preferably, the bottom of the aquaculture pond is equipped with a drainage slope, and the lower part of the drainage slope is matched with the drainage pipe.

[0013] Preferably, the water circulation component includes a sewage conveying pipe, a sewage conveying pump, and a clean water conveying pipe. One end of the sewage conveying pipe is fixedly connected to the end of the drain pipe that passes through the bottom of the aquaculture pond, and the other end is fixedly connected to the inlet. The sewage conveying pump is installed on the sewage conveying pipe. One end of the clean water conveying pipe is provided with a drainage structure. The end of the clean water conveying pipe with the drainage structure is located above the aquaculture pond, and the other end is fixedly connected to the outlet.

[0014] Preferably, the drainage structure includes a tee joint and a pair of outlet pipes. One end of the tee joint is fixedly connected to the end of the clean water delivery pipe, and the pair of outlet pipes are respectively located at the other two ends of the tee joint, with one end of the outlet pipes fixedly connected to the tee joint.

[0015] Preferably, a first manual valve is provided on the sewage conveying pipeline, and the first manual valve is located on the sewage conveying pipeline between the sewage conveying pump and the inlet.

[0016] Preferably, a second manual valve is provided at one end of the clean water delivery pipeline near the outlet.

[0017] Preferably, the inlet is provided with a guide tube at one end inside the first filter compartment, with one end of the guide tube fixedly connected to the inlet and the other end extending to the lower end of the first filter compartment.

[0018] Preferably, the third filter compartment is provided with a first support plate, and the first support plate is provided with a plurality of first flow holes for water to pass through, and the first support plate is positioned above the third connecting port.

[0019] Preferably, the fourth filter compartment is provided with a second support plate, which has a plurality of second flow holes for water to pass through, and the second support plate is positioned above the third connecting port.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] This invention uses a multi-stage filter canister consisting of a first, second, third, and fourth filter compartment connected in sequence. The first filter compartment is positioned higher than the second, third, and fourth filter compartments, and the inlet is also positioned higher than the second filter compartment. This height difference effectively prevents wastewater overflow. Furthermore, the outlet diameter is larger than the inlet diameter, allowing the outflow velocity to exceed the inflow velocity, further preventing overflow and improving coordination with the water pump. This invention solves the problems of inconsistent filter compartment heights leading to water overflow, improper inlet and outlet pipe diameter design, and energy waste and low efficiency caused by poor coordination with the water pump in current aquaculture systems. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a fish farming device for slimming fish as described in an embodiment of this utility model;

[0023] Figure 2 This is a partial structural schematic diagram of a fish farming device for slimming fish as described in an embodiment of this utility model;

[0024] Figure 3 This is a schematic diagram of the structure of the multi-stage filter barrel described in the embodiments of this utility model;

[0025] Figure 4 This is a cross-sectional structural diagram of the multi-stage filter barrel described in this embodiment of the utility model;

[0026] Figure 5 This is a cross-sectional structural diagram of the aquaculture pond described in this embodiment of the utility model;

[0027] Explanation of reference numerals in the attached figures:

[0028] 10-Aquaculture pond, 11-Multi-stage filter barrel, 12-First filter compartment, 13-Second filter compartment, 14-Third filter compartment, 15-Fourth filter compartment, 16-Inlet, 17-Outlet, 18-Water circulation component, 19-First connecting port, 20-Second connecting port, 21-Third connecting port, 22-Drainage pipe, 23-Drainage hole, 24-Sewage slope, 25-Sewage conveying pipe, 26-Sewage conveying pump, 27-Clean water conveying pipe, 28-Drainage structure, 29-T-connector, 30-Outlet pipe, 31-First manual valve, 32-Second manual valve, 33-Guide pipe, 34-First support plate, 35-First flow hole, 36-Second support plate, 37-Second flow hole, 38-Slide chute, 39-Sliding rod, 40-Floor drain, 41-Oxygen supply pipe. Detailed Implementation

[0029] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0030] Example:

[0031] like Figures 1 to 5 As shown, in order to solve the above problems, this embodiment discloses a fish farming device for slimmer fish, including:

[0032] Aquaculture pond 10 is used for raising lean fish.

[0033] A multi-stage filter tank 11 includes a first filter compartment 12, a second filter compartment 13, a third filter compartment 14, and a fourth filter compartment 15 arranged sequentially along the water flow direction. The first filter compartment 12 is fixedly connected in sequence. The first filter compartment 12 is higher than the second filter compartments 13, 14, and 15, which are at the same height. An inlet 16 is provided on the first filter compartment 12. The inlet 16 is connected to the inside of the first filter cell 12. The inlet 16 is located at the upper end of the first filter cell 12 and is higher than the second filter cell 13. The fourth filter cell 15 is provided with an outlet 17, which is connected to the inside of the fourth filter cell 15 and is located at the upper end of the fourth filter cell 15. The multi-stage filter barrel 11 is set above one side of the breeding pond 10. The inlet 16 and outlet 17 on the multi-stage filter barrel 11 are connected to the breeding pond 10 through the water circulation component 18, respectively. The diameter of the outlet 17 is larger than the diameter of the inlet 16.

[0034] The lower ends of the first filter grid 12 and the second filter grid 13 are connected through the first connecting port 19, the upper ends of the second filter grid 13 and the third filter grid 14 are connected through the second connecting port 20, and the lower ends of the third filter grid 14 and the fourth filter grid 15 are connected through the third connecting port 21.

[0035] This invention addresses the problems of inconsistent filter chamber heights leading to water overflow, improper inlet / outlet pipe diameter design, and poor coordination with the water pump in current aquaculture systems. The multi-stage filter 11 consists of a first filter chamber 12, a second filter chamber 13, a third filter chamber 14, and a fourth filter chamber 15, all connected in sequence. The height of the first filter chamber 12 is higher than that of the second filter chamber 13, and the inlet 16 is also higher than that of the second filter chamber 13. These heights effectively prevent wastewater overflow. Furthermore, the diameter of the outlet 17 is larger than that of the inlet 16, ensuring a higher outflow rate than inflow rate, further preventing wastewater overflow and improving coordination with the water pump. This invention solves the problems of inconsistent filter chamber heights causing water overflow, unreasonable inlet / outlet pipe diameter design, and energy waste and low efficiency caused by poor coordination with the water pump in current aquaculture systems.

[0036] The multi-stage filter barrel 11 can be installed on a base structure so that it is higher than the aquaculture pond 10. The base structure includes, but is not limited to, a flat ground and a mounting frame that are higher than the aquaculture pond 10.

[0037] To facilitate the discharge of sewage from the aquaculture pond 10, this embodiment is modified based on the above embodiment. The difference from the above embodiment is that a drain pipe 22 is provided in the aquaculture pond 10. One end of the drain pipe 22 is located inside the aquaculture pond 10, and the other end extends through the bottom of the aquaculture pond 10 to the outside of the aquaculture pond 10. The drain pipe 22 is fixed and sealed to the bottom of the aquaculture pond 10. Several drain holes 23 are provided on the end of the drain pipe 22 located inside the aquaculture pond 10.

[0038] The installation of drain pipe 22 and drain hole 23 facilitates the discharge of sewage from the aquaculture pond 10.

[0039] As a further preferred embodiment, a plurality of drainage holes 23 are arranged in a gradient from bottom to top on the drainage pipe 22.

[0040] To further facilitate the discharge of sewage from the aquaculture pond 10, this embodiment is modified based on the above embodiment. The difference from the above embodiment is that the bottom of the aquaculture pond 10 is provided with a sewage discharge slope 24, and the lower part of the sewage discharge slope 24 is set in conjunction with the drainage pipe 22.

[0041] The drainage slope 24 allows the bottom of the aquaculture pond 10 to slope toward the drainage pipe 22, thereby allowing sewage to be discharged from the drainage pipe 22 more effectively.

[0042] To achieve wastewater purification and recycling, this embodiment is modified based on the above embodiment. The difference from the above embodiment is that the water circulation component 18 includes a wastewater conveying pipe 25, a wastewater conveying pump 26, and a clean water conveying pipe 27. One end of the wastewater conveying pipe 25 is fixedly connected to the end of the drain pipe 22 that passes through the bottom of the breeding pond 10, and the other end is fixedly connected to the inlet 16. The wastewater conveying pump 26 is installed on the wastewater conveying pipe 25. One end of the clean water conveying pipe 27 is provided with a drainage structure 28. The end of the clean water conveying pipe 27 with the drainage structure 28 is located above the breeding pond 10, and the other end is fixedly connected to the outlet 17.

[0043] The drainage structure 28 includes a three-way connector 29 and a pair of outlet pipes 30. One end of the three-way connector 29 is fixedly connected to the end of the clean water delivery pipe 27. The pair of outlet pipes 30 are respectively set at the other two ends of the three-way connector 29, and one end of the outlet pipes 30 is fixedly connected to the three-way connector 29.

[0044] Water discharged from drain pipe 22 enters sewage conveying pipe 25 and, under the action of sewage conveying pump 26, enters multi-stage filter barrel 11 through inlet 16. Clean water filtered by multi-stage filter barrel 11 enters clean water conveying pipe 27 through outlet 17. Since the height of multi-stage filter barrel 11 is higher than that of aquaculture pond 10, clean water can be conveyed from clean water conveying pipe 27 to the top of aquaculture pond 10 and discharged into aquaculture pond 10 through tee connector 29 and a pair of outlet pipes 30.

[0045] To facilitate the closure of the sewage delivery pipe 25 and the clean water delivery pipe 27 during cleaning, this embodiment is modified based on the above embodiment. The difference from the above embodiment is that a first manual valve 31 is provided on the sewage delivery pipe 25. The first manual valve 31 is located on the sewage delivery pipe 25 between the sewage delivery pump 26 and the inlet 16.

[0046] Among them, a second manual valve 32 is provided at one end of the clean water delivery pipe 27 near the outlet 17.

[0047] The first manual valve 31 and the second manual valve 32 are designed to facilitate the closure of the sewage delivery pipe 25 and the clean water delivery pipe 27 during cleaning.

[0048] To prevent sewage splashing, this embodiment is modified based on the above embodiment. The difference from the above embodiment is that the inlet 16 is provided with a guide tube 33 at one end inside the first filter grid 12. One end of the guide tube 33 is fixedly connected to the inlet 16, and the other end extends to the lower end of the first filter grid 12.

[0049] To facilitate the support of the filter medium, this embodiment is modified based on the above embodiment. The difference from the above embodiment is that the third filter compartment 14 is provided with a first support plate 34, and the first support plate 34 is provided with a plurality of first flow holes 35 for water to flow through. The first support plate 34 is located above the third communication port 21, and the first support plate 34 is detachably connected to the third filter compartment 14.

[0050] The first support plate 34 is provided to facilitate support of the medium inside the third filter compartment 14. The first support plate 34 and the third filter compartment 14 are connected by bolts, among other things.

[0051] To facilitate the support of the filter medium, this embodiment is modified based on the above embodiment. The difference from the above embodiment is that the fourth filter compartment 15 is provided with a second support plate 36, and the second support plate 36 is provided with a plurality of second flow holes 37 for water flow. The second support plate 36 is located above the third communication port 21, and the second support plate 36 is detachably connected to the fourth filter compartment 15.

[0052] The second support plate 36 is provided to facilitate support of the medium inside the fourth filter compartment 15. The second support plate 36 and the fourth filter compartment 15 are connected by bolts, among other things.

[0053] To facilitate the installation of filter brushes and ultraviolet germicidal lamps in the second filter compartment 13, this embodiment is modified based on the above embodiment. The difference from the above embodiment is that the second filter compartment 13 is provided with a pair of sliding grooves 38, which are located on both sides of the upper end of the second filter compartment 13. A plurality of sliding rods 39 are provided between the pair of sliding grooves 38, and the two ends of the plurality of sliding rods 39 are slidably connected to the pair of sliding grooves 38 respectively.

[0054] To facilitate wastewater discharge during cleaning of the multi-functional filter canister, this embodiment modifies the previous embodiment. The difference lies in that the bottom of the first filter compartment 12, the second filter compartment 13, the third filter compartment 14, and the fourth filter compartment 15 are all equipped with floor drains 40. The floor drains 40 can be existing sealable floor drains. The floor drains 40 facilitate the removal of impurities, wastewater, and dirt from the multi-functional filter canister during cleaning.

[0055] To facilitate oxygen supply, an oxygen supply pipe 41 is provided at the lower end of the aquaculture pond 10. The oxygen supply pipe 41 has several air outlets, and one end of the oxygen supply pipe 41 can be connected to an external oxygen source.

[0056] In one embodiment, as a further preferred option:

[0057] The first filter compartment 12 has a height of 90cm, a length of 50cm, and a width of 50cm.

[0058] The first filter compartment 12 is designed with a length of 50cm and a height of 90cm, which can provide a larger cross-sectional area, thereby holding more water. When dirt accumulates and obstructs the water flow, there is more space to buffer the rise in water level. Combined with its height advantage, it can effectively prevent sewage from overflowing from the top of the tank.

[0059] The second filter compartment 13 has a height of 50cm, a length of 38cm, and a width of 50cm.

[0060] The second filter compartment 13 is equipped with several sets of brushes, one end of which is located inside the second filter compartment 13, and the other end of which is respectively fitted onto several sliding rods 39. The brushes can intercept most large particles of impurities. At least one pair of ultraviolet germicidal lamps are installed on the side wall of the second filter compartment 13. The ultraviolet germicidal lamps are respectively installed below a pair of sliding grooves 38 and fixedly connected to the second filter compartment 13. The ultraviolet germicidal lamps are used to disinfect bacteria, viruses and other microorganisms in the water, thereby improving the safety of the water quality.

[0061] The third filter compartment 14 is 50cm high, 42cm long, and 50cm wide. It is filled with coral stone, which is deposited on the first support plate 34. The porous structure of the coral stone provides a habitat for nitrifying bacteria, enabling biological filtration and decomposing harmful substances such as ammonia nitrogen and nitrite in the water. Simultaneously, the calcium carbonate it contains helps stabilize the pH value of the water and increase its hardness.

[0062] The fourth filter compartment 15 is 50cm high, 20cm long, and 50cm wide. It is filled with a mixture of activated carbon and coral stone, which is then piled on the second support plate 36. Activated carbon, with its strong adsorption capacity, can adsorb discoloration, odors, residual medications, and some organic matter in the water. Working synergistically with the coral stone, it further purifies the water. A 90mm diameter outlet 17 is positioned here, fully utilizing the principle of gravity drainage. The larger pipe diameter significantly reduces water flow resistance, allowing the water after four stages of filtration to drain quickly and smoothly under gravity, preventing water accumulation in the tank and ensuring the stability and continuity of the filtration process.

[0063] The inlet 16 is located 10cm from the top of the first filter compartment 12, and the diameter of the inlet 16 is 7.5cm. The outlet 17 is located 20cm from the top of the fourth filter compartment 15, and the diameter of the outlet 17 is 9cm. The diameter of the inlet 16 is 7.5cm and the diameter of the outlet 17 is 9cm, so that the water outflow speed is greater than the water inflow speed.

[0064] The sewage transfer pump 26 can be a 50-watt water pump from the prior art. The multi-functional filter canister described in this embodiment can meet the full power operation of the 50-watt water pump.

[0065] Working principle of this utility model:

[0066] This invention configures a multi-stage filter tank 11 with a first filter compartment 12, a second filter compartment 13, a third filter compartment 14, and a fourth filter compartment 15 connected in sequence. The height of the first filter compartment 12 is set higher than that of the second, third, and fourth filter compartments 13 and 14, respectively. Simultaneously, the inlet 16 is set higher than that of the second filter compartment 13. The heights of the first filter compartment 12 and the inlet 16 effectively prevent sewage overflow. Furthermore, the diameter of the outlet 17 is set larger than that of the inlet 16, allowing the outflow rate to be greater than the inflow rate, further preventing sewage overflow and thus enabling better coordination with the water pump.

[0067] The embodiments described above merely illustrate specific implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A fish farming device for slimmer fish, characterized in that, include: Aquaculture pond (10) is used for raising lean fish; A multi-stage filter barrel (11) includes a first filter grid (12), a second filter grid (13), a third filter grid (14), and a fourth filter grid (15) arranged sequentially along the water flow direction. The first filter grid (12), the second filter grid (13), the third filter grid (14), and the fourth filter grid (15) are fixedly connected in sequence. The first filter grid (12) is higher than the second filter grid (13), the third filter grid (14), and the fourth filter grid (15). The second filter grid (13), the third filter grid (14), and the fourth filter grid (15) are at the same height. The first filter grid (12) is provided with an inlet (16). The inlet (16) is connected to the inside of the first filter grid (12). The inlet (16) is located at the top of the first filter grid (12) and is higher than the second filter grid (13). The fourth filter grid (15) is provided with an outlet (17). The outlet (17) is connected to the inside of the fourth filter grid (15). The outlet (17) is located at the top of the fourth filter grid (15). The multi-stage filter barrel (11) is set above one side of the breeding pond (10). The inlet (16) and outlet (17) on the multi-stage filter barrel (11) are connected to the breeding pond (10) through the water circulation component (18). The diameter of the outlet (17) is larger than the diameter of the inlet (16). The lower ends of the first filter grid (12) and the second filter grid (13) are connected through the first connecting port (19), the upper ends of the second filter grid (13) and the third filter grid (14) are connected through the second connecting port (20), and the lower ends of the third filter grid (14) and the fourth filter grid (15) are connected through the third connecting port (21).

2. The fish farming apparatus for slimming fish according to claim 1, characterized in that, A drain pipe (22) is provided inside the breeding pond (10). One end of the drain pipe (22) is located inside the breeding pond (10), and the other end extends through the bottom of the breeding pond (10) to the outside of the breeding pond (10). The drain pipe (22) is fixed and sealed to the bottom of the breeding pond (10). Several drain holes (23) are provided on the end of the drain pipe (22) located inside the breeding pond (10).

3. The fish farming apparatus for slimming fish according to claim 2, characterized in that, The bottom of the aquaculture pond (10) is provided with a sewage slope (24), and the sewage slope (24) is set in conjunction with the drainage pipe (22) at a lower position.

4. A fish farming apparatus for slimming fish according to claim 2 or 3, characterized in that, The water circulation component (18) includes a sewage conveying pipe (25), a sewage conveying pump (26), and a clean water conveying pipe (27). One end of the sewage conveying pipe (25) is fixedly connected to the end of the drain pipe (22) that passes through the bottom of the aquaculture pond (10), and the other end is fixedly connected to the inlet (16). The sewage conveying pump (26) is installed on the sewage conveying pipe (25). One end of the clean water conveying pipe (27) is provided with a drainage structure (28). One end of the clean water conveying pipe (27) with the drainage structure (28) is located above the aquaculture pond (10), and the other end is fixedly connected to the outlet (17).

5. The fish farming apparatus for slimming fish according to claim 4, characterized in that, The drainage structure (28) includes a tee joint (29) and a pair of outlet pipes (30). One end of the tee joint (29) is fixedly connected to the end of the clean water delivery pipe (27). The pair of outlet pipes (30) are respectively set at the other two ends of the tee joint (29). One end of the outlet pipes (30) is fixedly connected to the tee joint (29).

6. The fish farming apparatus for slimming fish according to claim 5, characterized in that, A first manual valve (31) is provided on the sewage conveying pipeline (25). The first manual valve (31) is located on the sewage conveying pipeline (25) between the sewage conveying pump (26) and the inlet (16).

7. The fish farming apparatus for slimming fish according to claim 6, characterized in that, A second manual valve (32) is provided at one end of the clean water delivery pipe (27) near the outlet (17).

8. The fish farming apparatus for slimming fish according to claim 7, characterized in that, The inlet (16) is located inside the first filter cell (12) and has a guide tube (33) at one end. One end of the guide tube (33) is fixedly connected to the inlet (16), and the other end extends to the lower end of the first filter cell (12).

9. The fish farming apparatus for slimming fish according to claim 8, characterized in that, The third filter compartment (14) is provided with a first support plate (34), and the first support plate (34) is provided with a number of first flow holes (35) for water to flow through. The first support plate (34) is located above the third connecting port (21).

10. A fish farming apparatus for slimming fish according to claim 9, characterized in that, The fourth filter compartment (15) is provided with a second support plate (36), and the second support plate (36) is provided with several second flow holes (37) for water to flow through. The second support plate (36) is located above the third connecting port (21).

Images