Precise filtering device

Abstract

The invention provides a precise filtering device which comprises a shell, a filter element, a filter element, a filter element and a filter element, wherein an accommodating space is formed in the shell; the air inlet hole is formed in the side wall of the shell; the air outlet hole is formed in the top wall of the shell; the mounting part is arranged in the accommodating space and is positioned between the air inlet hole and the air outlet hole; the filtering unit is arranged on the mounting part; the positioning structure is arranged between the mounting part and the filtering unit; and the locking structure is arranged between the mounting part and the positioning structure and can limit the position of the filtering unit. According to the technical scheme, the problem that the position of the filter element is unstable in the prior art is effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of filters, and in particular to a precision filtering device. Background Art

[0002] The filter is an indispensable device on the pipeline for conveying media, which is used to remove impurities in the media. The precision filter element is the key component of the filter. The filtering performance of the filter depends on the structure of the filter element and the type of filter material. The structure of the filter element includes line gap type, sheet type, sintered type, and cylindrical type; the filter material is made of glass fiber, synthetic fiber, plant fiber, metal fiber felt and metal steel mesh; according to the filtering accuracy, the minimum particle size that can be effectively filtered out is divided into 10μm, 40μm, and 100μm.

[0003] In the related art, the filter element is installed in the precision filter. During the filtering process, the fluid will impact the filter element, which will cause the position of the filter element to be unstable, and then cause the fluid to flow out from the gap between the filter element and the precision filter, which will affect the filtering effect. Summary of the invention

[0004] The main purpose of the present invention is to provide a precision filtering device to solve the problem of unstable position of the filter element in the related art.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a precision filtering device is provided, including: a shell, the interior of which is provided with a accommodating space; an air inlet, which is arranged on the side wall of the shell; an air outlet, which is arranged on the top wall of the shell; a mounting portion, which is arranged in the accommodating space and is located between the air inlet and the air outlet; a filter unit, which is arranged on the mounting portion; a positioning structure, which is arranged between the mounting portion and the filter unit; and a locking structure, which is arranged between the mounting portion and the positioning structure and can limit the position of the filter unit.

[0006] Furthermore, the mounting part includes a mounting plate, a mounting hole is provided on the mounting plate, the filter unit is inserted into the mounting hole, the positioning structure includes a positioning hole and a positioning block, the positioning hole and the positioning hole are positioned in cooperation, one of the positioning hole and the positioning block is provided on the mounting plate, and the other of the positioning hole and the positioning block is provided on the filter unit.

[0007] Furthermore, the positioning block is arranged on the filter unit, and a hollow structure is arranged on the positioning block. The locking structure includes a stop block and a driving structure. The stop block has an avoidance state located in the hollow structure and a stop state extending out of the hollow structure. The driving structure can drive the stop block to switch between the avoidance state and the stop state.

[0008] Further, the driving structure comprises a bending rod, a first end of the bending rod protrudes from the filter unit and forms a driving end, and a second end of the bending rod is drivingly matched with the stop block.

[0009] Furthermore, a reset member is arranged between the stop block and the hollow structure.

[0010] Furthermore, there are multiple mounting holes, and the distance between any two adjacent mounting holes is equal.

[0011] Furthermore, the filter unit includes a first cylinder, a second cylinder and a filter structure, the second cylinder is arranged in the first cylinder, the filter structure is arranged between the first cylinder and the second cylinder, a plurality of first holes are arranged on the first cylinder, and a plurality of second holes are arranged on the second cylinder.

[0012] Further, each first hole body has a plurality of first corners, and the number of the first corners of each first hole body is greater than six.

[0013] Further, each second hole body has a plurality of second corners, and the number of the second corners of each second hole body is greater than the number of the first corners of the first hole body.

[0014] Furthermore, the filter structure has a guide channel inside, and a filter membrane is arranged in the guide channel.

[0015] By applying the technical solution of the present invention, a housing is provided inside the shell, and an air inlet and an air outlet are both provided on the shell and are connected to the housing space. The mounting portion is provided in the housing space and between the air inlet and the air outlet. The filter unit is provided on the mounting portion. The positioning structure is provided between the mounting portion and the filter unit, and the locking structure is provided between the mounting portion and the positioning structure and can limit the position of the filter unit. Through the above-mentioned arrangement, the gas enters the housing space through the air inlet, passes through the filter unit, and is discharged from the air outlet. The positioning structure can make the position of the filter unit more stable, and the locking structure can limit the position of the filter unit, thereby preventing the filter unit from shaking, thereby ensuring the filtering effect. Therefore, the technical solution of the present application effectively solves the problem of unstable position of the filter element in the related art. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 A schematic structural diagram of an embodiment of a precision filtering device according to the present invention is shown;

[0018] Figure 2 Shows Figure 1 A schematic top view of the mounting portion of the precision filtering device;

[0019] Figure 3 Shows Figure 1 A cross-sectional schematic diagram of a filter unit of a precision filtration device;

[0020] Figure 4 Shows Figure 3 A partial enlarged view of the filter unit at point A;

[0021] Figure 5 Shows Figure 3 A schematic structural diagram of a first pore body of a filtration unit;

[0022] Figure 6 Shows Figure 3 A schematic structural diagram of a second pore body of a filtration unit;

[0023] Figure 7 Shows Figure 3 A cross-sectional schematic diagram of a filtration structure.

[0024] The above drawings include the following reference numerals:

[0025] 10. Shell; 11. Accommodating space; 21. Air inlet; 22. Air outlet; 30. Mounting portion; 31. Mounting plate; 311. Mounting hole; 40. Filter unit; 41. First cylinder; 411. First hole; 42. Second cylinder; 421. Second hole; 43. Filter structure; 431. Guide channel; 432. Filter membrane; 50. Positioning structure; 51. Positioning hole; 52. Positioning block; 60. Locking structure; 61. Stop block; 62. Driving structure; 621. Bending rod; 63. Resetting member. DETAILED DESCRIPTION

[0026] 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 described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0028] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0029] like Figures 1 to 4 As shown, in the present embodiment, the precision filtering device includes: a shell 10, an air inlet 21, an air outlet 22, a mounting portion 30, a filter unit 40, a filter unit 40, a positioning structure 50 and a locking structure 60. An accommodating space 11 is provided inside the shell 10. The air inlet 21 is provided on the side wall of the shell 10. The air outlet 22 is provided on the top wall of the shell 10. The mounting portion 30 is provided in the accommodating space 11 and is located between the air inlet 21 and the air outlet 22. The filter unit 40 is provided on the mounting portion 30. The positioning structure 50 is provided between the mounting portion 30 and the filter unit 40. The locking structure 60 is provided between the mounting portion 30 and the positioning structure 50 and can limit the position of the filter unit 40.

[0030] According to the technical solution of this embodiment, a housing 10 is provided with a storage space 11 inside, and an air inlet 21 and an air outlet 22 are both provided on the housing 10 and communicated with the storage space 11. The mounting portion 30 is provided in the storage space 11 and is located between the air inlet 21 and the air outlet 22. The filter unit 40 is provided on the mounting portion 30. The positioning structure 50 is provided between the mounting portion 30 and the filter unit 40, and the locking structure 60 is provided between the mounting portion 30 and the positioning structure 50 and can limit the position of the filter unit 40. Through the above-mentioned arrangement, the gas enters the storage space 11 through the air inlet, passes through the filter unit 40, and is discharged from the air outlet 22. The positioning structure 50 can make the position of the filter unit 40 more stable, and the locking structure 60 can limit the position of the filter unit 40, thereby preventing the filter unit 40 from shaking, thereby ensuring the filtering effect. Therefore, the technical solution of this embodiment effectively solves the problem of unstable position of the filter element in the related art.

[0031] This precision filter device can not only be used for exhaust gas purification in industrial production to reduce environmental pollution due to its high-efficiency filtering ability, but can also effectively filter PM2.5, pollen, dust mites and other particles in the home environment to improve the comfort of the living environment. In the laboratory, it can ensure the purity of the experimental gas and prevent the experimental results from being interfered with by impurities. In addition, through optimized design, it can maintain stable operation under extreme temperature and humidity conditions, further broadening its application scope in special scenarios such as polar scientific research, deep-sea exploration, and high-temperature environment monitoring.

[0032] like Figures 1 to 4 As shown, in this embodiment, the mounting portion 30 includes a mounting plate 31, the mounting plate 31 is provided with a mounting hole 311, the filter unit 40 is inserted into the mounting hole 311, the positioning structure 50 includes a positioning hole 51 and a positioning block 52, the positioning hole 51 and the positioning hole 51 are positioned and matched, one of the positioning hole 51 and the positioning block 52 is provided on the mounting plate 31, and the other of the positioning hole 51 and the positioning block 52 is provided on the filter unit 40. The structure of the positioning hole 51 and the positioning block 52 is simple and convenient to set, and can effectively realize the positioning function.

[0033] Specifically, through the cooperation of the positioning hole 51 and the positioning block 52, the filter unit can be quickly and accurately installed at the specified position, reducing installation errors and improving the operating stability of the equipment. It is particularly suitable for occasions where the filter unit needs to be replaced frequently, such as air purification systems in the pharmaceutical and food processing industries.

[0034] This precise positioning and locking mechanism greatly improves the efficiency of filter unit replacement and reduces maintenance time. In the pharmaceutical industry, filter units can be quickly replaced while maintaining a sterile environment to avoid production interruptions and improve the safety and continuity of drug production. In the field of food processing, it can effectively filter microorganisms and dust in the air to ensure food quality, while facilitating cleaning and regular replacement to reduce the risk of cross contamination.

[0035] like Figures 1 to 4 As shown, in this embodiment, the positioning block 52 is arranged on the filter unit 40, and a hollow structure is arranged on the positioning block 52. The locking structure 60 includes a stop block 61 and a driving structure 62. The stop block 61 has an avoidance state located in the hollow structure and a stop state extending out of the hollow structure. The driving structure 62 can drive the stop block 61 to switch between the avoidance state and the stop state. The above arrangement can realize the fixing of the filter unit 40.

[0036] This design makes the installation and disassembly of the filter unit more convenient. At the same time, it can effectively prevent the filter unit from loosening and falling off during the operation of the equipment, ensuring the filtering effect. It is suitable for precision filtration needs in high-vibration environments, such as aerospace, cooling systems for precision electronic equipment, etc.

[0037] It should be noted that this innovative design shows excellent stability in high-vibration environments, effectively avoiding the problem of reduced filtration efficiency due to loose filter units. In the aerospace field, it can ensure the air quality inside the aircraft, protect electronic equipment from dust, and improve flight safety. In the cooling system of precision electronic equipment, it can effectively filter particles in the cooling gas, reduce wear on electronic components, and extend the life of the equipment.

[0038] like Figure 3 and Figure 4 As shown, in this embodiment, the driving structure 62 includes a bending rod 621, a first end of the bending rod 621 extends out of the filter unit 40 and forms a driving end, and a second end of the bending rod 621 is drivingly matched with the stop block 61. A first guiding slope is provided on the second end of the bending rod 621, and a second guiding slope is provided on the stop block 61. When the bending rod 621 moves upward, the first guiding slope and the second guiding slope can cooperate and push the stop block 61 out of the hollow structure.

[0039] Specifically, the locking and unlocking of the filter unit is achieved through a simple mechanical structure, which reduces the maintenance cost of the equipment and improves the convenience of operation. It is particularly suitable for occasions with limited on-site operating conditions, such as field operations, filtering systems of mobile equipment, etc.

[0040] It should be noted that the simplified design of the drive structure enables operators to easily replace the filter unit in complex environments without the need for professional tools, greatly improving the flexibility and efficiency of field operations. In field operations, it can quickly adapt to different pollution sources to ensure a clean working environment. In the filtration system of mobile equipment, such as in vehicles and emergency rescue vehicles, it can ensure the purification of the air inside the vehicle and protect the health of personnel.

[0041] like Figure 3 and Figure 4 As shown, in this embodiment, a reset member 63 is provided between the stop block 61 and the hollow structure. The reset member 63 can ensure that the stop block 61 is in an avoidance state. The design of the reset member 63 enables the stop block 61 to automatically reset after being unlocked, which reduces the operation steps and improves the work efficiency. It is suitable for occasions where the filter unit needs to be quickly replaced, such as air purification systems in hospital operating rooms and dust-free workshops.

[0042] Specifically, the automatic reset function of the reset member 63 ensures the rapidity and accuracy of the filter unit replacement, reducing the air pollution problem caused by improper operation. In the hospital operating room, the filter unit can be quickly replaced to maintain the sterility of the operating environment and protect the safety of patients and medical staff. In the air purification system of the dust-free workshop, it can quickly respond to sudden pollution incidents, replace the filter unit in time, and maintain the high standard of cleanliness of the production environment.

[0043] like Figure 2 As shown, in this embodiment, there are multiple mounting holes 311, and the distance between any two adjacent mounting holes 311 is equal. The above arrangement can make the overall structure more stable. Specifically, there are three mounting holes 311, and the circular connecting line of the three mounting holes 311 forms an equilateral triangle. The above-mentioned design of evenly distributed mounting holes 311 can ensure the balanced distribution of the filter unit in the housing 10, improve the filtering efficiency and the service life and use effect of the equipment, and is suitable for occasions where a large amount of gas needs to be processed, such as large industrial waste gas treatment systems, urban air purification facilities, etc.

[0044] Specifically, the uniform distribution of the mounting holes 311 effectively avoids uneven gas flow, improves the utilization rate of the filter unit, and also reduces the overall energy consumption of the equipment. In large industrial waste gas treatment systems, the waste gas can be evenly distributed to ensure that each filter unit can play its maximum efficiency and reduce energy waste in the gas treatment process. In urban air purification facilities, the uniformity of air purification can be improved, the risk of local air pollution can be reduced, and cleaner air can be provided for urban residents.

[0045] like Figure 3 , Figure 5 as well as Figure 6 As shown, in the present embodiment, the filter unit 40 includes a first barrel 41, a second barrel 42 and a filter structure 43, the second barrel 42 is arranged in the first barrel 41, the filter structure 43 is arranged between the first barrel 41 and the second barrel 42, the first barrel 41 is provided with a plurality of first holes 411, and the second barrel 42 is provided with a plurality of second holes 421. The fluid can enter the filter structure through the first hole 411 and flow out through the second hole 421. When the fluid contacts the first hole 411, the first filtration can be achieved, when the fluid contacts the filter structure 43, the second filtration can be achieved, and when the fluid passes through the second hole 421, the third filtration can be achieved, that is, the filter unit 40 can achieve three filtrations, so that the filtering effect can be better. This double barrel design can provide a larger filtering area, and at the same time, through the cooperation of the first hole 411 and the second hole 421, multi-stage filtration is achieved, which effectively improves the filtering accuracy, and is suitable for occasions with high requirements for filtering effect, such as ultra-clean environment maintenance in industries such as biopharmaceuticals and semiconductor manufacturing.

[0046] Specifically, the double-barrel design significantly improves the filtration accuracy by increasing the filtration path, especially in the biopharmaceutical and semiconductor manufacturing industries, which can effectively remove particles and chemicals in the air, avoid product contamination, improve yield, and reduce production costs. At the same time, this design can adapt to the filtration needs of high-flow gases and provide a stable and reliable air purification solution for large-scale production facilities.

[0047] like Figure 3 , Figure 5 as well as Figure 6 As shown, in this embodiment, each first hole body 411 has a plurality of first corners, and the number of first corners of each first hole body 411 is greater than 6. The above arrangement can hook impurities in the fluid, thereby achieving a better filtering effect. Specifically, by increasing the number of first corners, the gas flow path can be further refined and the filtering efficiency can be improved, which is suitable for occasions where tiny particles need to be processed, such as gas purification in industries such as nano material production and precision instrument manufacturing.

[0048] The design of the first hole 411 effectively improves the ability to capture tiny particles by increasing the number of corners, and is particularly suitable for the field of nanomaterial production. It can ensure the purity of the air during the production process, prevent the nanomaterials from being affected by foreign impurities, and ensure product quality. In the manufacture of precision instruments, it can effectively filter dust in the air, prevent instrument components from being contaminated, and improve the accuracy and stability of the instrument.

[0049] like Figure 3 , Figure 5 as well as Figure 6 As shown, in this embodiment, a plurality of floating strips are arranged on the inner wall of the first hole body 411. The arrangement of the floating strips can stick to impurities, thereby achieving filtration. Specifically, the material of the floating strips is plant fiber.

[0050] like Figure 3 , Figure 5 as well as Figure 6 As shown, in this embodiment, each second hole body 421 has a plurality of second corners, and the number of the second corners of each second hole body 421 is greater than the number of the first corners of the first hole body 411. The above-mentioned second corner arrangement can further improve the filtering effect, and since the number of the second corners is greater than the number of the first corners, the filtering effect of the second hole body 421 can be better. The second hole body 421 has a larger number of second corners, which can provide a more refined filtering effect, and is suitable for occasions with extremely high requirements for gas purity, such as laboratories, gas supply systems of medical equipment, etc., to ensure that the gas does not contain any impurities and ensure the safety of experiments and medical operations.

[0051] It should be noted that the ultimate design of the second hole body 421 significantly improves the fineness of filtration by increasing the number of second corners, and is particularly suitable for laboratory gas purification, which can effectively remove chemical gases and particles in the air, protect the accuracy of experimental results, and improve the safety of experiments. In the gas supply system of medical equipment, it can ensure the purity of the oxygen supply and gas supply system, avoid interference of pollutants in medical operations, and ensure the life safety of patients.

[0052] like Figure 3 and Figure 7As shown, in this embodiment, the filter structure 43 has a guide channel 431 inside, and a filter membrane 432 is arranged in the guide channel 431. The fluid can flow in the guide channel 431, and can be filtered through the filter membrane 432. Specifically, a plurality of filter membranes 432 are arranged in the guide channel 431, and the intervals between two adjacent filter membranes 432 are not equal along the direction of the guide channel 431. Through the cooperation of the guide channel 431 and the filter membrane 432, the directional flow and efficient filtration of the gas are achieved, which is suitable for occasions where high-flow gas needs to be processed, such as large-scale industrial gas processing systems such as chemical plants and oil refineries, and effectively removes harmful substances and protects the environment and equipment safety.

[0053] The innovative combination of the flow guide channel 431 and the filter membrane 432 not only improves the filtering efficiency, but also can meet the filtering needs of high-flow gas, especially in the waste gas treatment of chemical plants and oil refineries, it can effectively filter harmful gases such as sulfides and nitrogen oxides, reduce environmental pollution, and protect production equipment from corrosion, thereby extending the service life of the equipment. For high-temperature and high-pressure industrial environments, the optimized flow guide channel design can also effectively reduce temperature loss during gas treatment and improve energy efficiency.

[0054] like Figure 3 and Figure 7 As shown, in this embodiment, the filter unit 40 is provided with an inlet on one side facing the first cylinder 41, and an outlet on one side facing the second cylinder 42, and the flow guide channel is connected between the inlet and the outlet. The above arrangement can achieve fluid diversion.

[0055] like Figure 3 and Figure 7 As shown, in this embodiment, there are multiple guide channels, and in the direction from the inlet portion to the outlet portion, the widths of the multiple guide channels first decrease and then increase.

[0056] In summary, the precision filtration device provided in this embodiment is not only innovative and practical in design, but can also be widely used in multiple fields, including industrial production, medical health, scientific research experiments, environmental monitoring, etc., providing efficient and reliable solutions for gas filtration in different scenarios. Through continuous technical optimization and material improvement, the precision filtration device can better adapt to various complex environments and achieve higher precision filtration effects.

[0057] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0058] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0059] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A precision filtering device, characterized in that: include: A housing (10), wherein a receiving space (11) is provided inside the housing (10); An air inlet (21) is arranged on a side wall of the housing (10); An air outlet hole (22) is arranged on the top wall of the housing (10); A mounting portion (30) is arranged in the accommodating space (11) and is located between the air inlet (21) and the air outlet (22); A filter unit (40) is arranged on the mounting portion (30); A positioning structure (50) is arranged between the mounting portion (30) and the filter unit (40); A locking structure (60) is arranged between the mounting portion (30) and the positioning structure (50) and is capable of limiting the position of the filter unit (40).

2. The precision filtration device according to claim 1, characterized in that: The mounting portion (30) comprises a mounting plate (31), the mounting plate (31) is provided with a mounting hole (311), the filter unit (40) is inserted into the mounting hole (311), the positioning structure (50) comprises a positioning hole (51) and a positioning block (52), the positioning hole (51) and the positioning hole (51) are positioned and matched, one of the positioning hole (51) and the positioning block (52) is provided on the mounting plate (31), and the other of the positioning hole (51) and the positioning block (52) is provided on the filter unit (40).

3. The precision filtration device according to claim 2, characterized in that: The positioning block (52) is arranged on the filter unit (40), and a hollow structure is arranged on the positioning block (52). The locking structure (60) comprises a stop block (61) and a driving structure (62). The stop block (61) has an avoidance state located in the hollow structure and a stop state extending out of the hollow structure. The driving structure (62) can drive the stop block (61) to switch between the avoidance state and the stop state.

4. The precision filtration device according to claim 3, characterized in that: The driving structure (62) comprises a bending rod (621), a first end of the bending rod (621) extending out of the filter unit (40) and forming a driving end, and a second end of the bending rod (621) drivingly cooperates with the stop block (61).

5. The precision filtration device according to claim 3, characterized in that: A reset member (63) is provided between the stop block (61) and the hollow structure.

6. The precision filtration device according to claim 2, characterized in that: There are a plurality of mounting holes (311), and the distance between any two adjacent mounting holes (311) is equal.

7. The precision filtration device according to claim 1, characterized in that: The filter unit (40) comprises a first cylinder (41), a second cylinder (42) and a filter structure (43); the second cylinder (42) is arranged in the first cylinder (41); the filter structure (43) is arranged between the first cylinder (41) and the second cylinder (42); a plurality of first holes (411) are arranged on the first cylinder (41); and a plurality of second holes (421) are arranged on the second cylinder (42).

8. The precision filtration device according to claim 7, characterized in that: Each of the first hole bodies (411) has a plurality of first corner portions, and the number of the first corner portions of each of the first hole bodies (411) is greater than 6.

9. The precision filtration device according to claim 8, characterized in that: Each of the second hole bodies (421) has a plurality of second corner portions, and the number of the second corner portions of each of the second hole bodies (421) is greater than the number of the first corner portions of the first hole body (411).

10. The precision filtration device according to claim 7, characterized in that: The filter structure (43) has a flow guide channel (431) inside, and a filter membrane (432) is arranged inside the flow guide channel (431).

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