Gas-phase liquid filtering tank with condensation function

Abstract

The utility model discloses a gas phase liquid filtering tank with a condensation function, which comprises a filtering tank main body, a filtering assembly and a cooling assembly, the upper end and the lower end of the filtering tank main body are respectively communicated with a recovery pipe and a liquid discharge pipe, the filtering assembly comprises a plurality of layers of filtering plates, and the plurality of layers of filtering plates are distributed in the filtering tank main body from top to bottom; and the cooling assembly is positioned between two adjacent layers of filter plates. According to the utility model, the filtering assembly and the cooling assembly are directly arranged in the filtering tank main body, so that a gas-liquid mixture entering the filtering tank can be quickly cooled and filtered, the situation that gas-phase liquid is wasted due to the fact that gas-phase liquid steam cannot be recycled is avoided, and a manner of primarily filtering, cooling and filtering again is adopted, so that the gas-phase liquid steam can be recycled. And meanwhile, the internal space of the filtering tank main body is fully utilized, so that the whole gas-phase liquid filtering tank is compact in structure, small in occupied area and convenient to install and arrange.

Description

Technical Field

[0001] The utility model relates to the technical field of filtering devices, in particular to a gas-phase liquid filtering tank with a condensation function. Background Art

[0002] The recovery and purification of gaseous liquids (such as steam and volatile solvents) is crucial in numerous industrial fields, including chemical, pharmaceutical, food processing, and environmental protection. Traditionally, these production processes rely on a single filter tank to perform preliminary filtration of the gas-liquid mixture to remove solid impurities or particulate matter. However, this filter tank is relatively simple in function and can only recover liquid gaseous liquids, but not the gaseous liquid vapor in the gas-liquid mixture, which easily leads to the loss and waste of the gaseous liquid. Utility Model Content

[0003] The purpose of the utility model is to overcome the defect in the prior art that the filter tank has a single function and easily causes loss and waste of gas phase liquid, and to provide a gas phase liquid filter tank with a condensation function.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] An embodiment of the present utility model provides a gas-liquid filter tank with a condensation function, including a filter tank body, a filter assembly and a cooling assembly. The upper and lower ends of the filter tank body are respectively connected to a recovery pipe and a drain pipe. The filter assembly includes multiple layers of filter plates, and the multiple layers of filter plates are distributed from top to bottom in the filter tank body; the cooling assembly is located between two adjacent layers of the filter plates.

[0006] In one embodiment, the cooling assembly includes a cooling water pipe that is bent.

[0007] In one embodiment, a water inlet pipe is provided at the upper end of the filter tank body, and a water outlet pipe is provided at the lower end. The water inlet pipe is connected to the water inlet of the cooling water pipe, and the water outlet pipe is connected to the water outlet of the cooling water pipe.

[0008] In one embodiment, the filter tank body includes a tank cover, a tank body and a conical bottom tank connected in sequence from top to bottom, the recovery pipe is arranged above the tank cover, and the drain pipe is arranged at the bottom end of the conical bottom tank.

[0009] In one embodiment, the cooling assembly is installed in the tank.

[0010] In one embodiment, the filter plates are installed at both upper and lower ends of the tank body.

[0011] In one embodiment, the tank cover is connected to a vacuum assembly.

[0012] In one embodiment, the recovery pipe is connected to a first valve, and the discharge pipe is connected to a second valve.

[0013] In one embodiment, the tank cover has an air chamber extending downwardly.

[0014] In one embodiment, the filter plates are provided at both the upper and lower ends of the air chamber, the filter plate at the upper end of the air chamber is a first filter plate, and the filter plate at the lower end of the air chamber is a second filter plate. The first filter plate has a connecting portion extending downward, and the connecting portion is connected to the second filter plate and the lower end of the tank cover.

[0015] The gas-liquid filter tank with condensation function of the utility model has the following advantages compared with the prior art: by directly arranging the filter component and the cooling component in the filter tank body, the incoming gas-liquid mixture can be quickly cooled, so that the gas-liquid vapor is fully condensed into liquid in a short time, thereby improving the condensation efficiency and avoiding the situation where the gas-liquid vapor cannot be recovered and the gas-liquid loss and waste is avoided. Since the cooling process is completed in a closed system, heat loss is reduced, energy utilization efficiency is improved, and energy consumption is reduced. In addition, a method of preliminary filtration followed by cooling and re-filtration is adopted, thereby improving the gas-liquid recovery efficiency and recovery purity, and at the same time making full use of the internal space of the filter tank body, so that the entire recovery device has a compact structure, occupies a small area, and is easy to install and layout.

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0018] Figure 1 This is a schematic diagram of the structure of the gas-liquid filter tank with condensation function provided by the utility model;

[0019] Figure 2 This is a schematic structural diagram of the filter tank body provided by the utility model;

[0020] Figure 3 A top view of the filter tank body provided by the utility model;

[0021] Figure 4 The utility model provides Figure 3 Cross-sectional view of AA;

[0022] Figure 5The utility model provides Figure 3 Axial section view of line AA.

[0023] 1. Filter tank body; 11. Tank cover; 111. Air chamber; 12. Tank body; 13. Conical bottom tank; 2. Filter assembly; 21. Filter plate; 211. Filter hole; 212. First filter plate; 2121. Connecting part; 213. Second filter plate; 22. Filter space; 3. Cooling assembly; 31. Cooling water pipe; 4. Recovery pipe; 5. Drain pipe; 51. Second valve; 6. Water inlet pipe; 61. Control valve; 7. Water outlet pipe; 8. Vacuum assembly. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0028] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0029] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0030] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean 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 invention. In this specification, the schematic expressions of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0031] See also Figures 1 to 5 As shown, the utility model discloses a specific embodiment of a gas-liquid filter tank with a condensation function, including a filter tank body 1, a filter assembly 2 and a cooling assembly 3. The upper and lower ends of the filter tank body 1 are respectively connected to a recovery pipe 4 and a drain pipe 5. The filter assembly 2 includes a multi-layer filter plate 21, and the multi-layer filter plates 21 are distributed from top to bottom in the filter tank body 1, and the cooling assembly 3 is located between two adjacent layers of filter plates 21.

[0032] Specifically, the gas-liquid mixture flows into the filter tank body 1 through the recovery pipe 4, and the filter plate 21 located above the cooling component 3 filters the gas-liquid mixture to preliminarily remove large particle impurities and gaseous impurities in the gas-liquid mixture. The cooling component 3 cools the preliminarily removed gas-liquid mixture so that the gas phase liquid vapor in the gas-liquid mixture is fully condensed into liquid. The filter plate 21 below the cooling component 3 continues to filter the cooled gas-liquid mixture to more effectively separate small particle impurities from the gas-liquid mixture. The gas phase liquid obtained after cooling and filtration is discharged through the drain pipe 5, thereby realizing the recovery of the gas phase liquid. That is to say, this embodiment, by directly arranging the filter component 2 and the cooling component 3 in the filter tank body 1, can quickly filter and cool the incoming gas-liquid mixture, so that the gas-phase liquid vapor is fully condensed into liquid in a short time, thereby improving the condensation efficiency and avoiding the situation where the gas-phase liquid vapor cannot be recovered and the gas-phase liquid is wasted. Since the cooling process is completed in a closed system, heat loss is reduced, energy utilization efficiency is improved, and energy consumption is reduced. In addition, the method of primary filtration followed by cooling and re-filtration is adopted, which can ensure that the gas-liquid mixture enters the cooling component 3 in a relatively pure state, so as to fully utilize the heat exchange function of the cooling component 3 and ensure the maximum cooling effect, so that the gas-phase liquid vapor can be more fully condensed into liquid when passing through the cooling component 3, thereby improving the recovery rate of the gas-phase liquid and reducing resource waste. At the same time, it can also protect the cooling component 3 from direct impact of large particles. The cooled gas-liquid mixture is again finely filtered through the filter plate 21 to further remove small particle impurities and ensure the purity of the final gas-phase liquid. It also fully utilizes the internal space of the filter tank body 1, making the entire recovery device compact in structure, small in footprint, and easy to install and layout. At the same time, the use of multi-stage filtration can also reduce the filtration burden of subsequent levels and significantly improve the overall filtration efficiency.

[0033] Preferably, the filter plates 21 are provided with filter holes 211, and the pore diameters of the filter holes 211 on different filter plates 21 gradually decrease as the layers increase from top to bottom, thereby achieving a step-by-step filtration effect. That is, as the fluid flows downward, the filtration accuracy gradually increases, thereby ensuring the high purity of the final gas-phase liquid. It is understood that the number of layers, material, pore diameter, and other parameters of the filter plates 21 can be adjusted according to filtration requirements to achieve optimal filtration effect.

[0034] Preferably, the multi-layer filter plates 21 are distributed from top to bottom in the filter tank body 1, so that a plurality of filter spaces 22 are formed from top to bottom in the filter tank body 1, and adsorbent materials (not shown in the figure) are provided in the filter spaces 22.

[0035] Specifically, the adsorbent material includes activated carbon, molecular sieves, adsorbent cotton, and the like. In other embodiments, other types of materials may be used depending on the adsorption effect. By providing the adsorbent material within the filtration space 22, large solid impurities, small impurities, and oil contaminants in the gas-liquid mixture can be gradually intercepted, and particles and pollutants of different sizes and properties can be filtered layer by layer to provide a more effective purification effect.

[0036] In a specific embodiment, the cooling assembly 3 includes a cooling water pipe 31 that is bent.

[0037] Specifically, cooling water flows through the cooling water pipe 31. The curved cooling water pipe 31 increases the contact area between the cooling assembly 3 and the gas-liquid mixture, making heat exchange more complete so that the cooling water can more effectively absorb the heat in the gas-liquid mixture, thereby accelerating the condensation process of the gas-phase liquid vapor and improving the cooling efficiency. At the same time, the curved design allows the cooling water pipe 31 to bend back multiple times within a limited space, making full use of the space within the filter tank body 1. This compact layout not only reduces the volume of the cooling assembly 3, but also makes the entire recovery device more compact, facilitating installation and layout.

[0038] In a specific embodiment, a water inlet pipe 6 is provided at the upper end of the filter tank body 1 , and a water outlet pipe 7 is provided at the lower end. The water inlet pipe 6 is connected to the water inlet of the cooling water pipe 31 , and the water outlet pipe 7 is connected to the water outlet of the cooling water pipe 31 .

[0039] Specifically, by providing a water inlet pipe 6 and a water outlet pipe 7 in communication with the cooling water pipe 31, the cooling water in the cooling water pipe 31 is in a dynamic flow state, thereby accelerating the cooling effect of the gas-liquid mixture. At the same time, since the gas-liquid mixture flows in from the top of the filter tank body 1 and flows out from the bottom, and the cooling water also flows in from the top of the filter tank body 1 and flows out from the bottom, a counter-flow of heat is formed between the gas-liquid mixture and the cooling water, which helps to extend the heat exchange time and improve the heat exchange efficiency, thereby making the heat exchange more sufficient. At the same time, it helps to achieve uniform cooling, avoid local overheating or overcooling, make the condensation of gaseous liquid more complete, and reduce the waste of gaseous liquid.

[0040] In a specific embodiment, the water inlet pipe 6 and the water outlet pipe 7 are both connected to a control valve 61, so that when the filter tank body 1 performs a cooling operation, the control valve 61 is opened to allow cooling water to flow into the cooling component 3, and when the filter tank body 1 stops the cooling operation, the control valve 61 is closed so that cooling water is no longer passed into the cooling component 3, thereby avoiding waste of cooling water.

[0041] In a specific embodiment, the filter tank body 1 includes a tank cover 11, a tank body 12 and a conical bottom tank 13 connected in sequence from top to bottom, the recovery pipe 4 is arranged above the tank cover 11, and the drain pipe 5 is arranged at the bottom end of the conical bottom tank 13.

[0042] Specifically, the recovery pipe 4 is arranged above the tank cover 11, so that the gas-liquid mixture can directly and smoothly enter the interior of the filter tank body 1, avoiding the fluid splashing or blockage caused by improper feeding position; the drain pipe 5 is arranged at the bottom end of the conical bottom tank 13, and the flow-gathering effect of the conical structure is utilized to enable the filtered liquid to be discharged quickly and centrally, thereby improving the drainage efficiency and reducing the residual gas phase liquid. At the same time, the design of the tank cover 11, the tank body 12 and the conical bottom tank 13 being connected in sequence from top to bottom makes the overall structure of the filter tank body 1 compact and stable, and is also easy to assemble and disassemble, making the maintenance and replacement of the filter assembly 2 and the cooling assembly 3 more convenient. When the filter assembly 2 and the cooling assembly 3 need to be cleaned or replaced, it is only necessary to open the tank cover 11 to operate without disassembling the entire filter tank body 1.

[0043] In one embodiment, the cooling assembly 3 is installed in the tank 12 .

[0044] Specifically, the tank body 12 is cylindrical, and the cooling water pipe 31 is spirally arranged within the tank body 12. This allows the cooling water pipe 31 to provide more heat exchange area within a limited space, thereby improving cooling efficiency. The spiral flow of the cooling water can generate a certain centrifugal force, which helps stabilize the flow of the cooling water and reduce turbulence and eddy currents, thereby improving the stability and reliability of the heat exchange process. Furthermore, the installation of the cooling water pipe 31 within the tank body 12 facilitates its installation and provides the cooling assembly 3 with limited protection from the tank body 12, preventing the cooling water pipe 31 from colliding with other structures during assembly and disassembly, thereby preventing structural damage.

[0045] In one embodiment, filter plates 21 are installed at both the upper and lower ends of the tank body 12 .

[0046] Specifically, by arranging filter plates 21 at both the upper and lower ends of the tank body 12, it is equivalent to performing double filtration at key positions where the fluid enters and exits the tank body 12, which can effectively intercept and remove impurities, particulate matter and other insoluble substances in the gas-liquid mixture, ensuring that the fluid processed by the filter tank body 1 is purer and the flow of the gas-liquid mixture is more stable. At the same time, the filter plate 21 also prevents the gas-liquid mixture from impacting the structure inside the tank body 12 and preventing the structure inside the tank body 12 from falling out, and can effectively protect the structure inside the tank body 12 (such as the cooling component 3).

[0047] In a specific embodiment, the tank cover 11 is connected to the vacuum assembly 8 .

[0048] Specifically, when the canister body 1 needs to recover the gas-liquid mixture, the vacuum assembly 8 is opened to evacuate the canister body 1, allowing the gas-liquid mixture to enter the canister body 1. When the amount of liquid accumulated in the tank body 12 and the conical bottom tank 13 reaches a predetermined amount, the vacuum assembly 8 is closed to allow the filtered gas-phase liquid to flow out of the drain pipe 5. When the gas-phase liquid is completely drained, the vacuum assembly 8 is opened again to continue recovering the gas-liquid mixture. In other words, the vacuum assembly 8 evacuates the canister body 1 to a vacuum state, creating a low-pressure environment within the canister body 1, making it easier for the gas-phase liquid vapor to condense into liquid under the same cooling conditions. Therefore, the vacuum operation can significantly improve the condensation efficiency of the gas-phase liquid vapor, thereby accelerating the recovery of the gas-phase liquid. During the vacuuming process, air and other impurities in the canister body 1 can be effectively expelled, providing a relatively pure environment for the gas-liquid mixture to enter. This helps to reduce the influx of impurities during the gas-phase liquid recovery process and improve the purity of the recovered gas-phase liquid. When the amount of liquid accumulated in the tank body 12 and the conical bottom tank 13 reaches a preset amount, the vacuum assembly 8 is closed to accurately control the timing of discharging the gas phase liquid to avoid the liquid flowing out too early or too late, thereby ensuring the stability and efficiency of the recovery process.

[0049] Preferably, the recovery pipe 4 is connected to a first valve (not shown in the figure), and the discharge pipe 5 is connected to a second valve 51 .

[0050] Specifically, when the filter tank body 1 needs to recover the gas-liquid mixture, the first valve and the second valve 51 are both in a closed state; after the vacuum assembly 8 has completed the vacuum operation, the first valve is opened to allow the gas-liquid mixture to enter the filter tank body 1; when the amount of liquid accumulated in the tank body 12 and the conical bottom tank 13 reaches a preset amount, the vacuum assembly 8 and the first valve are closed, and the second valve 51 is opened to allow the filtered gas phase liquid to flow out of the drain pipe 5; when the gas phase liquid is completely drained, the second valve 51 is closed. Through the first valve and the second valve 51, in conjunction with the vacuum assembly 8, the liquid inlet and outlet of the filter tank body 1 can be precisely controlled, achieving precise management and efficient execution of the gas-liquid mixture recovery process, thereby improving recovery efficiency.

[0051] In a specific embodiment, the tank cover 11 extends downward to form an air chamber 111 , and at least one layer of filter plate 21 is disposed in the air chamber 111 .

[0052] Specifically, filter plates 21 are provided at the upper and lower ends of the air chamber 111, and the gas-liquid mixture enters the air chamber 111 from the recovery pipe 4, so that the filter plates 21 in the air chamber 111 preliminarily filter the impurities in the gas-liquid mixture, and the preliminarily filtered gas-liquid mixture then enters the tank body 12, so that the purity of the gas-liquid phase in the gas-liquid mixture entering the tank body 12 is improved, and most of the gas impurities can rise directly to the air chamber 111, and a small amount of gas overflowing the air chamber 111 will only rise to the upper end of the tank body 12, so as to reduce the gas storage capacity in the tank body 12 and increase the liquid storage capacity of the tank body 12, thereby increasing the filtration capacity and improving the filtration efficiency. At the same time, the gas impurities rising to the upper end of the tank body 12 and the air chamber 111 can be quickly extracted by the vacuum assembly 8, thereby ensuring the filtration quality and improving the purity of the recovered gas-phase liquid.

[0053] In a specific embodiment, the filter plate 21 at the upper end of the air chamber 111 is a first filter plate 212, and the filter plate 21 at the lower end of the air chamber 111 is a second filter plate 213. The first filter plate 212 extends downward to have a connecting portion 2121, which is connected to the second filter plate 213 and the lower end of the tank cover 11.

[0054] Specifically, the connecting portion 2121 and the first filter plate 212 are an integrally formed structure, and the connecting portion 2121 and the second filter plate 213 and the tank cover 11 are detachably connected, thereby improving the stability of the connection structure formed by the first filter plate 212, the second filter plate 213 and the tank cover 11, avoiding the first filter plate 212 and the second filter plate 213 from being displaced and structurally damaged due to the strong suction force generated by the vacuum assembly 8, and facilitating assembly and disassembly, thereby facilitating easy replacement of the filter plate 21 according to different filtering requirements, thereby improving the flexibility and scalability of the filter tank.

[0055] In a specific embodiment, the tank body 12 is provided with a two-layer support assembly (not shown in the figure), and the support assembly includes a plurality of support plates (not shown in the figure) installed on the inner side of the tank body 12, and the filter plate 21 is detachably connected to the support plate.

[0056] Specifically, the support plates in the support assembly are evenly distributed inside the tank body 12, so that the filter plates 21 are stably connected to the support plates and are easily removable, thereby facilitating easy replacement of the filter plates 21 according to different filtration requirements, thereby improving the flexibility and scalability of the filter tank. Preferably, the support assembly includes three support plates, which can stably support the filter plates 21 and facilitate installation and removal of the filter plates 21 without wasting space or hindering the flow of the gas-liquid mixture, thereby reducing the production cost of the support assembly.

[0057] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present technical solution is within the protection scope of the present invention.

Claims

1. A gas-liquid filter tank with condensation function, characterized in that: It includes a filter tank body, a filter assembly and a cooling assembly. The upper and lower ends of the filter tank body are respectively connected to a recovery pipe and a drain pipe. The filter assembly includes multiple layers of filter plates, and the multiple layers of filter plates are distributed from top to bottom in the filter tank body; the cooling assembly is located between two adjacent layers of the filter plates.

2. The gas-liquid filter tank with condensation function according to claim 1, characterized in that: The cooling assembly includes a cooling water pipe that is bent.

3. The gas-liquid filter tank with condensation function according to claim 2, characterized in that: The upper end of the filter tank body is provided with a water inlet pipe, and the lower end is provided with a water outlet pipe. The water inlet pipe is connected to the water inlet of the cooling water pipe, and the water outlet pipe is connected to the water outlet of the cooling water pipe.

4. The gas-liquid filter tank with condensation function according to claim 1, characterized in that: The filter tank body includes a tank cover, a tank body and a conical bottom tank which are sequentially connected from top to bottom. The recovery pipe is arranged above the tank cover, and the drain pipe is arranged at the bottom end of the conical bottom tank.

5. The gas-liquid filter tank with condensation function according to claim 4, characterized in that: The cooling assembly is installed in the tank body.

6. The gas-liquid filter tank with condensation function according to claim 4, characterized in that: The filter plates are installed at both the upper and lower ends of the tank body.

7. The gas-liquid filter tank with condensation function according to claim 4, characterized in that: The tank cover is connected to a vacuum pumping component.

8. The gas-liquid filter tank with condensation function according to claim 4, characterized in that: The recovery pipe is connected to a first valve, and the discharge pipe is connected to a second valve.

9. The gas-liquid filter tank with condensation function according to claim 7, characterized in that: The tank cover is downwardly extended to form an air chamber.

10. The gas-liquid filter tank with condensation function according to claim 9, characterized in that: The filter plates are provided at the upper and lower ends of the air chamber, the filter plate at the upper end of the air chamber is the first filter plate, the filter plate at the lower end of the air chamber is the second filter plate, the first filter plate has a connecting portion extending downward, and the connecting portion is connected to the second filter plate and the lower end of the tank cover.

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