Circulating water filtering device

Abstract

The utility model relates to the technical field of circulating water filtering, and provides a circulating water filtering device. The circulating water filtering device comprises a filtering tank and a filtering assembly, the filtering tank comprises a tank body and a cover body, a filtering cavity is formed in the tank body, and a liquid inlet is formed in the cover body; the filter assembly comprises a filter cartridge and a filter screen which are arranged in the filter cavity, the top of the filter cartridge expands outwards to form an annular plate, and the annular plate can be in lap joint with the open end of the tank body and is pressed through a buckled cover body. According to the circulating water filtering device provided by the invention, the liquid inlet is formed in the cover body, so that circulating water can be introduced from top to bottom, the arrangement of the filtering assembly and the sealing of the liquid inlet are facilitated, and the filtering assembly comprises the filtering cylinder and the filtering net so as to realize double filtering and ensure the filtering effect, so that the filtered circulating water meets the use requirement; the filter cartridge is lapped at the open end of the tank body through the annular plate, so that the filter cartridge and the filter screen are convenient to clean, disassemble and assemble, and the operation convenience is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of circulating water filtration, and particularly to a circulating water filtration device. Background Art

[0002] Solar energy is the cleanest, safest and most reliable energy in the future. Therefore, photovoltaic is increasingly becoming an industry with explosive development. The so-called photovoltaic is to use the photovoltaic effect to project sunlight onto silicon materials to generate current for direct power generation. The photovoltaic industry mainly includes the production of high-purity polysilicon raw materials, the production of solar cells, the production of solar cell modules, the manufacture of related production equipment, etc. Among them, photovoltaic glass, as the special glass for the cover plate of solar cells, plays a crucial role. It not only protects the solar cell panel from oxidation and corrosion by external moisture and gases, but also ensures that the module is not damaged by external forces. The core performance of photovoltaic glass lies in its high light transmittance, high strength and strong corrosion resistance. This brings many challenges to the processing of display glass. How to ensure its high light transmittance during the fine processing of glass has become the focus of attention, and the water quality of the cooling circulating water in the processing process has an important impact on the light transmittance of the glass. Among them, in order to ensure the water quality, it is necessary to filter the cooling circulating water through a filtration device.

[0003] In this regard, the Chinese utility model patent CN209934186U discloses a circulating water high-efficiency filter treatment device. The circulating water high-efficiency filter treatment device includes a filter box. The top of the filter box is fixed with a box cover by bolts. The filter cylinder is fixed to the box cover through the bolt holes on the fixing plate, which is convenient for the disassembly and installation of the filter cylinder. The treatment device designed in this way can filter the circulating water and can replace the filter cylinder. However, the filtering effect of the single filter cylinder method is poor, and the disassembly and installation process of the bolt connection method is slow, affecting the use efficiency. Summary of the Utility Model

[0004] One technical problem to be solved by the present disclosure is that the current filtering device has a poor filtering effect using a single filter cylinder method, and the disassembly and installation process of the bolt connection method is slow, affecting the use efficiency.

[0005] To solve the above technical problem, an embodiment of the present disclosure provides a circulating water filtration device, including:

[0006] A filter tank, including a tank body with an open top and a cover body covering the open end of the tank body. A filter cavity is formed inside the tank body, and a liquid inlet for connecting with a liquid supply pipeline is provided on the cover body; and

[0007] A filter assembly, including a filter cylinder arranged inside the filter cavity and a filter net sleeved on the outer periphery of the filter cylinder. The top of the filter cylinder expands outwards to form an annular plate, and the annular plate can be lapped on the open end of the tank body and is pressed tightly by the covering cover body.

[0008] In some embodiments, an extension plate is provided on the outer periphery of the top of the tank body, and an extension cover plate is provided on one side of the cover body. The extension cover plate can cover the top of the extension plate. A first through hole is provided on the extension plate, and a second through hole is provided at a position corresponding to the first through hole on the extension cover plate.

[0009] The liquid supply pipeline includes a C-shaped pipe for connecting the liquid inlet and the second through hole and a liquid inlet pipe for connecting with the first through hole.

[0010] In some embodiments, the tank body and the cover body are detachably connected by a plurality of locking members.

[0011] In some embodiments, the locking member includes a lifting eye bolt hinged on the tank body. The hinge axis of the lifting eye bolt extends along the horizontal direction. An opening is provided at a position corresponding to the lifting eye bolt on the cover body in the vertical direction. When the lifting eye bolt rotates to the vertical position, the top of the lifting eye bolt can extend out of the opening and be connected with a lifting eye nut.

[0012] In some embodiments, a pressure transmitter is provided on the liquid supply pipeline.

[0013] In some embodiments, the pressure transmitter is signal-connected to an alarm and is configured to:

[0014] When the pressure detected by the pressure transmitter exceeds a preset pressure, trigger the alarm to alarm.

[0015] In some embodiments, the mesh number of the filter cartridge is 150 - 250 meshes.

[0016] In some embodiments, the mesh number of the filter screen is 2500 - 3500 meshes.

[0017] In some embodiments, the cover body and the tank body are sealed by a first sealing ring;

[0018] And / or, the extension cover plate and the extension plate are sealed by a second sealing ring.

[0019] In some embodiments, a top plate is provided on the top of the tank body. The outer periphery of the top plate protrudes from the tank body. The cover body is buckled with the top plate. A support ring for supporting the annular plate is provided on the top plate.

[0020] Through the above technical solutions, the circulating water filtering device provided by the present disclosure has the liquid inlet arranged on the cover body, so that the circulating water can be introduced from top to bottom, which is convenient for the arrangement of the filtering component and the sealing of the liquid inlet, making the structure simpler. And the filtering component includes a filter cartridge and a filter screen to achieve double filtration, ensuring the filtering effect and making the filtered circulating water meet the use requirements. The filter cartridge is lapped on the open end of the tank body through the annular plate, which is convenient for the cleaning, disassembly and assembly of the filter cartridge and the filter screen, and increases the convenience of operation. Description of the Drawings

[0021] To more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 It is a schematic structural diagram of the circulating water filtration device disclosed in the embodiments of the present disclosure;

[0023] Figure 2 It is a schematic structural diagram of the circulating water filtration device after removing the cover body disclosed in the embodiments of the present disclosure;

[0024] Figure 3 It is a front view of the circulating water filtration device disclosed in the embodiments of the present disclosure;

[0025] Figure 4 It is a schematic structural diagram of the filtration component disclosed in the embodiments of the present disclosure.

[0026] Explanation of reference numerals:

[0027] 1. Filtration tank; 11. Tank body; 111. Extension plate; 1111. First through hole; 12. Cover body; 121. Extension cover plate; 122. Opening; 1221. Protrusion; 2. Liquid supply pipeline; 21. C-shaped pipe; 22. Inlet pipe; 3. Filtration component; 31. Filtration cylinder; 311. Annular plate; 312. Reinforcing plate; 32. Filter net; 4. Locking part; 41. Eye bolt; 42. Eye nut; 43. Hinge rod; 5. Pressure transmitter; 6. First sealing ring; 7. Second sealing ring; 8. Top plate; 81. Support ring; 9. Mounting seat. Detailed implementation manners

[0028] The following will further describe in detail the implementation manners of the present disclosure in conjunction with the drawings and embodiments. The following detailed description of the embodiments and the drawings are used to exemplarily illustrate the principle of the present disclosure, but cannot be used to limit the scope of the present disclosure. The present disclosure can be implemented in many different forms, not limited to the specific embodiments disclosed herein, but including all technical solutions falling within the scope of the claims.

[0029] The present disclosure provides these embodiments to make the present disclosure thorough and complete, and fully convey the scope of the present disclosure to those skilled in the art. It should be noted that: unless otherwise specifically stated, the relative arrangements of the components and steps, the components of the materials, the numerical expressions and values described in these embodiments should be construed as merely exemplary, rather than as limitations.

[0030] It should be noted that in the description of the present disclosure, unless otherwise specified, the meaning of "a plurality" is greater than or equal to two; the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", etc. is only for the convenience of describing the present disclosure and simplifying the description, 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 thus should not be construed as a limitation to the present disclosure. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0031] In addition, the "first", "second" and similar terms used in the present disclosure do not denote any order, quantity or importance, but are only used to distinguish different parts. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range. Terms such as "including" or "comprising" mean that the elements before this term cover the elements listed after this term, and do not exclude the possibility of also covering other elements.

[0032] It should also be noted that in the description of the present disclosure, unless otherwise clearly specified and limited, the terms "installed", "connected" and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances. When it is described that a specific device is located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0033] All terms used in the present disclosure have the same meanings as those understood by those of ordinary skill in the art to which the present disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in a general dictionary, such as those, should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense, unless specifically defined as such here.

[0034] Techniques, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and devices should be regarded as part of the specification.

[0035] Combined with Figures 1 to 4As shown in the figure, an embodiment of the present disclosure provides a circulating water filtration device, which includes a filtration tank 1 and a filtration component 3. The filtration component 3 is arranged inside the filtration tank 1. The filtration tank 1 includes a tank body 11 with an open top and a cover body 12 covering the open end of the tank body 11. That is, the cover body 12 is detachably connected to the tank body 11 so that the open end of the tank body 11 can be opened or closed by opening or closing the cover body 12. A filtration cavity is formed inside the tank body 11. The cover body 12 is provided with a liquid inlet for connecting with a liquid supply pipeline 2, and the liquid inlet is communicated with the filtration cavity so that the circulating water in the liquid supply pipeline 2 enters the filtration cavity from top to bottom through the liquid inlet. As Figure 4 As shown in the figure, the filtration component 3 includes a filter cylinder 31 arranged inside the filtration cavity and a filter net 32 sleeved on the outer periphery of the filter cylinder 31. Among them, the connection method between the filter net 32 and the filter cylinder 31 is not limited. For example, after the filter net 32 is sleeved on the bottom of the filter cylinder 31, the filter net 32 and the filter cylinder 31 are connected by a clamp; or, the top of the filter net 32 is sleeved on the top of the filter cylinder 31 so that the filter net 32 and the filter cylinder 31 are pressed on the tank body 11 by the cover body 12, which increases the convenience of replacing and cleaning the filter net 32 and the filter cylinder 31. The top of the filter cylinder 31 expands outward to form an annular plate 311. That is, the filter cylinder 31 is in a cylindrical structure with an open top. The outer periphery of the open end of the top of the filter cylinder 31 is provided with an annular plate 311, and the annular plate 311 can be lapped on the open end of the tank body 11 and pressed by the buckled cover body 12 so that the filter cylinder 31 can be replaced by opening the cover body 12 and fixed by closing the cover body 12, which is convenient to operate. In addition, the top of the filter net 32 can also be sleeved on the outer periphery of the annular plate 311, which increases the convenience of disassembling and assembling the filter net 32.

[0036] By arranging the liquid inlet on the cover body 12, the circulating water filtration device provided by the present disclosure enables the circulating water to be introduced from top to bottom, which is convenient for the arrangement of the filtration component 3 and the sealing of the liquid inlet, making the structure simpler. And the filtration component 3 includes a filter cylinder 31 and a filter net 32 to achieve double filtration, ensuring the filtration effect and making the filtered circulating water meet the use requirements. The filter cylinder 31 is lapped on the open end of the tank body 11 through the annular plate 311, which is convenient for cleaning, disassembling and assembling the filter cylinder 31 and the filter net 32, and increases the convenience of operation.

[0037] In some embodiments, the circulating water filtration device can be used for filtering the cooling water in the glass processing process. At this time, the circulating water is the cooling water, and the circulating water filtration device can effectively remove impurities in the circulating water and ensure the processing quality of photovoltaic glass.

[0038] In some embodiments, in combination with Figures 1 to 3As shown in the figure, an extension plate 111 is provided on the outer periphery of the top of the tank body 11, that is, the extension plate 111 is arranged on one side of the top of the tank body 11, and the extension plate 111 extends along the horizontal direction. An extension cover plate 121 is provided on one side of the cover body 12, that is, the extension cover plate 121 is arranged on one side of the cover body 12, and the extension cover plate 121 is opposite to the extension plate 111 in the vertical direction. The extension cover plate 121 can cover the top of the extension plate 111 to realize the sealing between the cover body 12 and the tank body 11. A first through hole 1111 is provided on the extension plate 111, and the first through hole 1111 penetrates the extension plate 111. A second through hole is provided at the position of the extension cover plate 121 corresponding to the first through hole 1111, and the second through hole penetrates the extension cover plate 121, so that after the extension cover plate 121 covers the extension plate 111, the first through hole 1111 is communicated with the second through hole. The liquid supply pipe 2 includes a C-shaped pipe 21 for communicating the liquid inlet and the second through hole and a liquid inlet pipe 22 for connecting with the first through hole 1111. That is, both ends of the C-shaped pipe 21 are respectively communicated with the liquid inlet on the cover body 12 and the second through hole on the extension cover plate 121, one end of the liquid inlet pipe 22 is communicated with the first through hole 1111, and the other end is used for introducing circulating water.

[0039] Under this design method, the circulating water flows through the liquid inlet pipe 22 to the first through hole 1111, then flows through the first through hole 1111 and the second through hole to the C-shaped pipe 21, and finally flows through the liquid inlet to the filter cavity, so that the circulating water introduced from the side or below of the tank body 11 can flow into the tank body 11 from top to bottom through the top of the tank body 11, and the structure is simple. And a C-shaped pipe 21 can be formed on the top of the cover body 12, and the C-shaped pipe 21 can be held by the staff without setting other handles, making the overall structure more compact.

[0040] In some embodiments, as Figure 4 shown, a reinforcing plate 312 is provided on the filter cylinder 31 along the vertical direction. Among them, the reinforcing plate 312 can be one or more to increase the structural strength of the filter cylinder 31.

[0041] In some embodiments, the tank body 11 and the cover body 12 are detachably connected by a plurality of locking members 4.

[0042] Under this design method, by setting a plurality of locking members 4, the firmness of the connection between the tank body 11 and the cover body 12 can be increased, and the convenience of disassembly and assembly of the cover body 12 can be increased.

[0043] In some embodiments, there are three locking members 4, and the three locking members 4 are arranged along the circumferential direction of the cover body 12 to further increase the firmness of the connection between the tank body 11 and the cover body 12.

[0044] In some embodiments, in combination with Figure 1 , Figure 2 and Figure 3As shown in the figure, the locking member 4 includes a lifting eye bolt 41 hinged to the tank body 11. The hinge axis of the lifting eye bolt 41 extends along the horizontal direction so that the lifting eye bolt 41 can swing along the vertical direction. Among them, a hinge rod 43 is arranged on the tank body 11 along the horizontal direction, and the lifting eye bolt 41 is rotatably arranged on the hinge rod 43. Among them, the hinge rod 43 can be a screw rod screwed on the tank body 11, etc., which increases the convenience of disassembly and assembly of the lifting eye bolt 41. An opening 122 is provided at a position corresponding to the lifting eye bolt 41 in the vertical direction on the cover body 12. Specifically, a convex block 1221 is provided at a position corresponding to the lifting eye bolt 41 in the vertical direction on the cover body 12, and the opening 122 is arranged on the convex block 1221. The lifting eye bolt 41 during the swinging process can penetrate into the opening 122 or pass through the opening 122. When the lifting eye bolt 41 rotates to the vertical position, the top of the lifting eye bolt 41 can extend out of the opening 122 and be connected to the lifting eye nut 42. Then, through the cooperation of the lifting eye bolt 41 and the lifting eye nut 42, the cover body 12 is pressed tightly in the tank body 11.

[0045] Under this design method, the lifting eye bolt 41 can be made to snap into the opening 122 through the lifting eye bolt 41 to realize the circumferential limit of the cover body 12. Then, by screwing the lifting eye nut 42 onto the top of the lifting eye bolt 41, the cover body 12 is pressed tightly on the tank body 11, which increases the connection effect between the cover body 12 and the tank body 11. At the same time, the cover body 12 can be made to press tightly on the annular plate 311 to ensure the fixing effect of the filter cartridge 31. During disassembly, only need to unscrew the lifting eye nut 42, and rotate the lifting eye bolt 41 to a position where it disengages from the opening 122, then the cover body 12 can be removed, which increases the convenience of operation.

[0046] It can be understood that, as Figure 1 shown, one of the locking members 4 is always in the locked state, that is, the lifting eye nut 42 at this place does not need to be disassembled, and the cover body 12 at this place does not have an opening 122. At this time, after disassembling the other two lifting eye nuts 42, the lifting eye bolt 41 at this place can rotate relative to the hinge rod 43 so that the cover body 12 can be rotatably arranged on the tank body 11, preventing the cover body 12 from detaching from the tank body 11, and there is no need to repeatedly move the tank body 11, which increases the convenience of operation.

[0047] In some embodiments, a pressure transmitter 5 is provided on the liquid supply pipeline 2. Among them, the pressure transmitter 5 is arranged on the liquid inlet pipe 22. The pressure transmitter mainly consists of three parts: a pressure measuring element sensor (also called a pressure sensor), a measuring circuit, and a process connector. It can convert the physical pressure parameters such as gas and liquid sensed by the pressure measuring element sensor into standard electrical signals to supply secondary instruments such as indicating alarm instruments, recorders, and regulators for measurement, indication, and process adjustment. It is a conventional device, and its structure and working principle are not described in detail here.

[0048] In this application, the pressure transmitter 5 adjusts the water inflow according to the detected pressure conditions. Specifically, when there are too many impurities or particles, the filter cartridge 31 and the filter screen 32 will gradually accumulate impurities, causing poor water flow and a continuous rise in the water level. Since the cover 12 and the tank body 11 are sealed (sealed by the following first sealing ring 6 and second sealing ring 7), a sealed area is formed, and the pressure continuously increases. At this time, the pressure transmitter 5 adjusts the water volume according to the pressure conditions to avoid equipment damage caused by excessive pressure.

[0049] In some embodiments, the pressure transmitter 5 is signal-connected to an alarm, and the alarm is triggered to alarm when the pressure detected by the pressure transmitter 5 exceeds the preset pressure.

[0050] During use, when there are too many impurities or particles, the filter cartridge 31 and the filter screen 32 will gradually accumulate impurities, causing poor water flow and a continuous rise in the water level. Since the cover 12 and the tank body 11 are sealed (sealed by the following first sealing ring 6 and second sealing ring 7), a sealed area is formed, and the pressure continuously increases. At this time, the pressure transmitter 5 adjusts the water volume according to the pressure conditions. When the pressure continues to increase and exceeds the preset pressure, the alarm is triggered to alarm, reminding the staff to stop the machine or stop it automatically. The staff then conducts cleaning or replaces the filter component 3. By setting the pressure transmitter 5, abnormal phenomena of the filter component 3 can be monitored, ensuring product quality.

[0051] In some embodiments, the mesh number of the filter cartridge 31 is 150 - 250 meshes.

[0052] In some embodiments, the mesh number of the filter cartridge 31 is 200 meshes.

[0053] In some embodiments, the mesh number of the filter screen 32 is 2500 - 3500 meshes.

[0054] In some embodiments, the mesh number of the filter screen 32 is 3000 meshes.

[0055] With the filter cartridge 31 and the filter screen 32 of this size, the circulating water can be filtered successively by the filter cartridge 31 and the filter screen 32. Through the double - layer filtration method of the coarse filter cartridge 31 and the fine filter screen 32, tiny impurities and particles in the water can be filtered, removing the impurities in the water to the greatest extent, enabling the cooling water for glass processing to be recycled, not only ensuring the processing quality of the glass but also minimizing the water consumption cost to the greatest extent.

[0056] In some embodiments, as Figure 2 shown, the cover 12 and the tank body 11 are sealed by the first sealing ring 6.

[0057] In this design method, by setting the first sealing ring 6, the sealing effect between the cover 12 and the tank body 11 can be ensured.

[0058] Among them, the first sealing ring 6 is arranged at the top of the tank body 11 or on the support ring 81 of the following top plate 8, and when the sealing effect of the first sealing ring 6 decreases, the first sealing ring 6 can also be directly replaced, which is convenient to operate and ensures the sealing effect.

[0059] In some embodiments, as Figure 2 shown, the extension cover plate 121 and the extension plate 111 are sealed by a second sealing ring 7.

[0060] In this design, by setting the second sealing ring 7, the sealing effect between the extension cover plate 121 and the extension plate 111 can be ensured, and when the sealing effect of the second sealing ring 7 decreases, the second sealing ring 7 can also be directly replaced, which is convenient to operate and ensures the sealing effect.

[0061] In some embodiments, as Figure 2 shown, a top plate 8 is provided at the top of the tank body 11, the outer periphery of the top plate 8 protrudes from the tank body 11, the cover body 12 is buckled with the top plate 8, and a support ring 81 for supporting the annular plate 311 is provided on the top plate 8.

[0062] In this design, it is convenient to connect the cover body 12 and the tank body 11. At the same time, the cross-sectional area of the top of the tank body 11 is increased, which is convenient for the installation of the first sealing ring 6 between the cover body 12 and the tank body 11. In addition, the design of the support ring 81 facilitates the support and limitation of the annular plate 311 of the filter cartridge 31, making the overall structure more compact.

[0063] In some embodiments, the liquid inlet pipe 22 includes a straight joint, a three-way joint, a pipe thread reducing joint, an internal and external thread elbow, and a circular water pipe joint. Taking Figure 1 the shown direction as an example, one end of the straight joint is communicated with the first through hole 1111, the other end of the straight joint is communicated with the left end interface of the three-way joint, the top interface of the three-way joint is communicated with the pipe thread reducing joint, the top of the pipe thread reducing joint is communicated with the pressure transmitter 5, the right end interface of the three-way joint is communicated with one end of the internal and external thread elbow, the other end of the internal and external thread elbow is communicated with the circular water pipe joint, and the circular water pipe joint is used to connect to a water pump to introduce the preliminarily filtered circulating water. The structure of the liquid inlet pipe 22 designed in this way is compact and convenient for introducing the circulating water.

[0064] In some embodiments, an installation seat 9 is provided at the bottom of the tank body 11, and the tank body 11 is connected above the water tank through the installation seat 9, which is convenient for the installation of the tank body 11 and enables the filtered circulating water to enter the water tank.

[0065] The circulating water filtering device provided by the present disclosure can effectively filter impurities and particles in the circulating water, realize the maximum utilization of the circulating water, achieve the purpose of saving water and reducing production costs, and at the same time has a compact and simple structure and quick and easy replacement of accessories.

[0066] So far, the embodiments of the present disclosure have been described in detail. To avoid obscuring the concept of the present disclosure, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0067] Although some specific embodiments of the present disclosure have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and not for limiting the scope of the present disclosure. Those skilled in the art should understand that the above embodiments can be modified or partial technical features can be equivalently replaced without departing from the scope and spirit of the present disclosure. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way.

Claims

1. A circulating water filtration device, characterized in that: include: A filter tank (1) comprises a tank body (11) with an open top and a cover body (12) covering the open end of the tank body (11), wherein a filter cavity is formed inside the tank body (11), and a liquid inlet for connecting to a liquid supply pipe (2) is provided on the cover body (12); and The filter assembly (3) comprises a filter cartridge (31) arranged inside the filter cavity and a filter screen (32) sleeved on the outer periphery of the filter cartridge (31); the top of the filter cartridge (31) is expanded outward to form an annular plate (311); the annular plate (311) can overlap the open end of the tank body (11) and be pressed by the snap-fitting cover body (12).

2. The circulating water filtration device according to claim 1, characterized in that: An extension plate (111) is provided on the outer periphery of the top of the tank body (11), an extension cover plate (121) is provided on one side of the cover body (12), the extension cover plate (121) can cover the top of the extension plate (111), a first through hole (1111) is provided on the extension plate (111), and a second through hole is provided on the extension cover plate (121) at a position corresponding to the first through hole (1111); The liquid supply pipeline (2) comprises a C-shaped tube (21) for connecting the liquid inlet and the second through hole, and a liquid inlet tube (22) for connecting to the first through hole (1111).

3. The circulating water filtration device according to claim 1, characterized in that: The tank body (11) and the cover body (12) are detachably connected via a plurality of locking members (4).

4. The circulating water filtration device according to claim 3, characterized in that: The locking member (4) comprises a lifting eye bolt (41) hingedly arranged on the tank body (11), the hinge axis of the lifting eye bolt (41) extending in the horizontal direction, the cover body (12) and the lifting eye bolt (41) are provided with an opening (122) at a position corresponding to the lifting eye bolt (41) in the vertical direction, and when the lifting eye bolt (41) is rotated to a vertical position, the top of the lifting eye bolt (41) can extend out of the opening (122) and be connected to the lifting eye nut (42).

5. The circulating water filtration device according to claim 1, characterized in that: The liquid supply pipeline (2) is provided with a pressure transmitter (5).

6. The circulating water filtration device according to claim 5, characterized in that: The pressure transmitter (5) is connected to the alarm signal and is configured as follows: When the pressure detected by the pressure transmitter (5) exceeds a preset pressure, the alarm is triggered.

7. The circulating water filtration device according to claim 1, characterized in that: The mesh number of the filter cartridge (31) is 150-250 meshes.

8. The circulating water filtration device according to claim 1, characterized in that: The mesh size of the filter screen (32) is 2500-3500 meshes.

9. The circulating water filtration device according to claim 2, characterized in that: The cover body (12) and the tank body (11) are sealed via a first sealing ring (6); And / or, the extension cover plate (121) and the extension plate (111) are sealed via a second sealing ring (7).

10. The circulating water filter device according to any one of claims 1 to 9, characterized in that: A top plate (8) is provided on the top of the tank body (11), the outer periphery of the top plate (8) protrudes from the tank body (11), the cover body (12) is buckled with the top plate (8), and a support ring (81) for supporting the annular plate (311) is provided on the top plate (8).

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