Filtration device

Abstract

The present application relates to a filtering device, wherein a first housing cover is arranged outside a second housing and has a feed port, a side wall of the second housing is spaced apart from the side wall of the first housing to form a first filter chamber, and the second housing has a second filter chamber; a first filter tube is arranged in the first filter chamber, the first filter tube has a first flow channel and a first filter hole connected, the first flow channel is connected to the feed port, and the first filter hole is connected to the first filter chamber; a second filter tube is arranged in the second filter chamber, the second filter tube has a second flow channel and a second filter hole connected, the second flow channel is connected to the first filter chamber, and the second filter hole is connected to the second filter chamber. Compared with the conventional technology, the above filtering device can filter the fluid medium twice, so that the filtering device has a higher filtering accuracy, thereby ensuring that the filtered fluid medium can meet the corresponding pharmaceutical standards.

Description

Technical Field

[0001] The present application relates to the technical field of pharmaceutical engineering, and in particular to a filtering device. Background Art

[0002] When factories make medicines, they have extremely strict standards for the purity of fluid media, the content of microorganisms and chemical pollutants, etc. Therefore, they need to use filtering devices to filter the fluid media.

[0003] In traditional technology, the filtering accuracy of the filtering device is low, resulting in the fluid medium after filtering failing to meet pharmaceutical standards. Summary of the invention

[0004] Based on this, it is necessary to provide a filtering device to address the problem that the fluid medium filtered by the filtering device in the traditional technology cannot meet the pharmaceutical standards.

[0005] The technical solution is as follows:

[0006] One embodiment provides a filtering device, comprising:

[0007] A first shell and a second shell, wherein the first shell is covered outside the second shell and has a feed port, a side wall of the second shell is spaced apart from the side wall of the first shell to form a first filter cavity, and the second shell has a second filter cavity;

[0008] a first filter tube, the first filter tube being disposed in the first filter cavity, the first filter tube having a first flow channel and a first filter hole in communication, the first flow channel being in communication with the feed port, the first filter hole being in communication with the first filter cavity; and,

[0009] The second filter tube is disposed in the second filter cavity. The second filter tube has a second flow channel and a second filter hole that are connected. The second flow channel is connected to the first filter cavity, and the second filter hole is connected to the second filter cavity.

[0010] In the above-mentioned filtering device, the fluid medium flows into the first flow channel of the first filter tube through the feed port on the first shell, and flows out to the first filter cavity after the first filtration through the first filter hole. Subsequently, the fluid medium in the first filter cavity flows into the second flow channel of the second filter tube, and flows out to the second filter cavity after the second filtration through the second filter hole, so as to filter impurities in the fluid medium. Compared with the conventional technology, the above-mentioned filtering device can filter the fluid medium twice, so that the filtering device has a higher filtration accuracy, thereby ensuring that the fluid medium after filtration can meet the corresponding pharmaceutical standards.

[0011] In one embodiment, the first shell includes a first plate body and a second plate body, the first plate body and the second plate body are spaced apart to form an operating space, the filtering device also includes a first partition and a second partition, the first partition and the second partition are spaced apart in the operating space, the first filter chamber is arranged between the first partition and the second partition, the first partition and the first plate body are spaced apart to form a feed chamber, the feed port is connected to the first filter tube through the feed chamber, the second partition and the second plate body are spaced apart to form a transition chamber, the first filter chamber is connected to the second filter tube through the transition chamber.

[0012] In one embodiment, the first filter tube has a first end and a second end opposite to each other, the first end passes through the first partition and communicates with the feed cavity, and the second end is connected to the second partition.

[0013] In one embodiment, the second partition is provided with a first communicating hole, and the first filter cavity is communicated with the transition cavity through the first communicating hole.

[0014] In one embodiment, the filtering device further includes a third partition and a fourth partition, the third partition and the fourth partition are spaced apart in the second shell, the second filter chamber is arranged between the third partition and the fourth partition, the second shell has a discharge portion and a buffer chamber, the discharge portion is spaced apart from the fourth partition, the buffer chamber is arranged between the discharge portion and the fourth partition and is connected to the second filter chamber, the discharge portion is provided with a discharge port, and the discharge port is connected to the buffer chamber.

[0015] In one embodiment, the second filter tube has a third end and a fourth end opposite to each other, the third end passes through the third partition and communicates with the transition chamber, and the fourth end is disposed at the fourth partition.

[0016] In one embodiment, the fourth partition is provided with a second communicating hole, and the second filter cavity is connected with the buffer cavity through the second communicating hole.

[0017] In one embodiment, the filtering device further comprises a disinfection element, and the disinfection element is disposed in the feed cavity.

[0018] In one of the embodiments, the first shell is provided with a discharge port, and the discharge port is communicated with the first filter cavity.

[0019] In one embodiment, at least two first filter tubes are provided and arranged in parallel with each other; or / and,

[0020] The second filter tubes are provided with at least two and are arranged parallel to each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 Schematic diagram of the structure of a filtering device in one embodiment of the present application.

[0023] Figure 2 It is a first cross-sectional view of a filtering device in one embodiment of the present application.

[0024] Figure 3 This is a second cross-sectional view of the filtering device in one embodiment of the present application.

[0025] Figure 4 This is a third cross-sectional view of the filtering device in one embodiment of the present application.

[0026] Notes on the attached drawings:

[0027] 100, first shell; 110, feed port; 120, first filter cavity; 131, first plate; 132, second plate; 133, operating space; 140, discharge port; 200, second shell; 210, discharge part; 211, discharge port; 212, buffer cavity; 220, second filter cavity; 310, first filter tube; 311, first flow channel; 312, first end; 313, second end; 320, second filter tube; 321, second flow channel; 322, third end; 323, fourth end; 410, first partition; 411, feed cavity; 420, second partition; 421, transition cavity; 422, first connecting hole; 430, third partition; 440, fourth partition; 441, second connecting hole; 500, disinfection part. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0029] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does 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 cannot be understood as a limitation on the present application.

[0030] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0031] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0032] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0033] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0034] See also Figure 1 to Figure 2 An embodiment of the present application provides a filtering device, including a first shell 100, a second shell 200, a first filter tube 310 and a second filter tube 320, wherein the first shell 100 is covered on the outside of the second shell 200 and has a feed port 110, the side wall of the second shell 200 is spaced apart from the side wall of the first shell 100 to form a first filter cavity 120, and the second shell 200 has a second filter cavity 220; the first filter tube 310 is arranged in the first filter cavity 120, the first filter tube 310 has a first flow channel 311 and a first filter hole (not shown in the figure) in communication, the first flow channel 311 is in communication with the feed port 110, and the first filter hole is in communication with the first filter cavity 120; the second filter tube 320 is arranged in the second filter cavity 220, the second filter tube 320 has a second flow channel 321 and a second filter hole in communication, the second flow channel 321 is in communication with the first filter cavity 120, and the second filter hole is in communication with the second filter cavity 220.

[0035] In the above-mentioned filtering device, the fluid medium flows into the first flow channel 311 of the first filter tube 310 through the feed port 110 on the first shell 100, and flows out to the first filter chamber 120 after the first filtration through the first filter hole. Subsequently, the fluid medium in the first filter chamber 120 flows into the second flow channel 321 of the second filter tube 320, and flows out to the second filter chamber 220 after the second filtration through the second filter hole, so as to filter impurities in the fluid medium. Compared with the conventional technology, the above-mentioned filtering device can filter the fluid medium twice, so that the filtering device has a higher filtration accuracy, thereby ensuring that the filtered fluid medium can meet the corresponding pharmaceutical standards.

[0036] See also Figure 2 In one embodiment, the second housing 200 is further provided with a discharge port 211, which is communicated with the second filter cavity 220, so that the fluid medium in the second filter cavity 220 can flow out through the discharge port 211, so as to facilitate the collection of the filtered fluid medium.

[0037] In addition, in the above embodiment, when one of the first filter tube 310 or the second filter tube 320 is damaged and loses its filtering ability, the other can still perform filtering work; specifically, when the first filter tube 310 is damaged and loses its filtering ability, the fluid medium will flow out from the damaged part of the first filter tube 310 into the first filter cavity 120, and flow from the first filter cavity 120 to the second filter tube 320 for filtering. Correspondingly, when the second filter tube 320 is damaged and loses its filtering ability, the fluid medium passes through the first filter tube 310 and directly flows out from the damaged part of the second filter tube 320 into the second filter cavity 220. In this way, it can be ensured that before the staff repairs the first filter tube 310 or the second filter tube 320, the filtering device still has a certain filtering ability to prevent the unfiltered fluid medium from flowing to the production back end and causing risks.

[0038] By way of explanation, in the above-mentioned embodiment, the filtering device can filter the microorganisms, endotoxins and pyrogen substances in the fluid medium to ensure that the fluid medium meets the corresponding pharmaceutical standards.

[0039] Furthermore, in one embodiment, the aperture of the second filter hole is smaller than that of the first filter hole. In this way, impurities with larger diameters in the fluid medium can be filtered by the first filter hole first, and the second filter hole then filters impurities with smaller diameters in the fluid medium to prevent impurities with larger diameters from clogging the second filter hole, thereby achieving multi-gradient filtration.

[0040] Specifically, the filtering accuracy of the first filter tube 310 is 6000 Dalton to 6500 Dalton, and the filtering accuracy of the second filter tube 320 is 5000 Dalton to 5500 Dalton, so as to achieve multi-gradient filtration.

[0041] Furthermore, at least two first filter holes are provided and spaced apart on the side wall of the first filter tube 310, and at least two second filter holes are provided and spaced apart on the side wall of the second filter tube 320. At least two first filter holes and at least two second filter holes can increase the flow rate of the fluid medium and improve the filtering efficiency.

[0042] Specifically, in one embodiment, the first filter tube 310 and the second filter tube 320 are both membrane fibers, which have low cost and good filtering effect.

[0043] Furthermore, in a preferred embodiment, the membrane filament is made of polyethersulfone.

[0044] Specifically, in one embodiment, the first shell 100 and the second shell 200 are both made of organic materials, so that the filter device as a whole has good impact resistance and corrosion resistance, thereby improving the safety and durability of the filter device.

[0045] Furthermore, in a preferred embodiment, the first shell 100 and the second shell 200 are made of polysulfone material.

[0046] Preferably, see Figure 2 The opening direction of the feed port 110 is perpendicular to the extension direction of the first filter tube 310 so that the fluid medium can be fed tangentially.

[0047] Optionally, the first shell 100 and the second shell 200 may be prisms or cylinders, which are not specifically limited here. Figures 1 to 4 In the illustrated embodiment, the first shell 100 and the second shell 200 are both cylindrical.

[0048] See also Figure 2 In one embodiment, the first shell 100 includes a first plate body 131 and a second plate body 132, and the first plate body 131 and the second plate body 132 are spaced apart to form an operating space 133. The filtering device also includes a first partition 410 and a second partition 420, and the first partition 410 and the second partition 420 are spaced apart in the operating space 133. The first filter cavity 120 is arranged between the first partition 410 and the second partition 420, and the first partition 410 and the first plate body 131 are spaced apart to form a feed cavity 411. The feed port 110 is connected to the first filter tube 310 through the feed cavity 411. The second partition 420 and the second plate body 132 are spaced apart to form a transition cavity 421. The first filter cavity 120 is connected to the second filter tube 320 through the transition cavity 421.

[0049] The unfiltered fluid medium enters the feed chamber 411 through the feed port 110 and then enters the first filter tube 310. The feed chamber 411 can buffer the fluid medium to prevent the fluid medium from flowing too fast and causing impact and damage to the first filter tube 310. The fluid medium in the first filter chamber 120 then flows to the transition chamber 421. The transition chamber 421 can buffer the fluid medium to prevent the fluid medium from flowing too fast and causing impact and damage to the second filter tube 320. Such a configuration can effectively prevent damage to the first filter tube 310 and the second filter tube 320, thereby increasing the service life of the filter device.

[0050] For explanation, in the above embodiment, the operating space 133 is formed by the first plate body 131, the side plate of the first shell 100 and the second plate body 132. The fluid medium can enter the operating space 133 through the feed port 110 and be filtered in the operating space 133 to obtain a fluid medium that can meet the corresponding pharmaceutical standards.

[0051] See also Figure 2Furthermore, one end of the second shell 200 is penetrated through the first plate body 131 and is provided with a discharge port 211. After the unfiltered fluid medium enters the filter device from the feed port 110, it flows from the feed cavity 411 near the first plate body 131 to the transition cavity 421 near the second plate body 132 to complete the first filtration, and then flows from the transition cavity 421 near the second plate body 132 to the discharge port 211 near the first plate body 131 to complete the second filtration. With such an arrangement, the filter device can realize multi-gradient filtration while the overall structure is more compact, so that the overall footprint of the filter device in the factory is smaller, and the filter device can realize multi-gradient filtration within a limited footprint, saving factory space.

[0052] See also Figure 2 In one embodiment, the first filter tube 310 has a first end 312 and a second end 313 opposite to each other. The first end 312 is disposed in the first partition 410 and communicates with the feed cavity 411 , and the second end 313 is connected to the second partition 420 .

[0053] The fluid medium in the feed chamber 411 can enter the first flow channel 311 through the first end 312 of the first filter tube 310 for subsequent filtering steps. The first end 312 of the first filter tube 310 is inserted into the first partition 410, and the second end 313 of the first filter tube 310 is connected to the second partition 420. In this way, the first filter tube 310 can be more firmly fixed by the first partition 410 and the second partition 420 to prevent the first filter tube 310 from being deformed and damaged, thereby improving the overall service life of the filtering device.

[0054] Furthermore, the second end 313 of the first filter tube 310 is sealed and fixed to the second partition 420, and the first filter hole is provided on the side wall of the first filter tube 310. In this way, the fluid medium can only flow to the first filter cavity 120 through the first filter hole on the side wall of the first filter tube 310, thereby improving the fixing effect of the first filter tube 310 while ensuring the filtering effect.

[0055] See also Figures 2 to 3 In one embodiment, the second partition 420 is provided with a first communicating hole 422 , and the first filter cavity 120 is connected to the transition cavity 421 through the first communicating hole 422 .

[0056] The first filter cavity 120 and the transition cavity 421 are connected via the first communication hole 422 , so that the fluid medium filtered by the first filter tube 310 can enter the filter cavity through the first communication hole 422 .

[0057] For further information, see Figure 3The second partition 420 is provided with at least two first communicating holes 422 to increase the flow rate of the fluid medium when flowing from the first filter cavity 120 to the transition cavity 421, thereby improving the filtering efficiency.

[0058] See also Figure 2 In one embodiment, the filtering device further includes a third partition 430 and a fourth partition 440, the third partition 430 and the fourth partition 440 are spaced apart in the second shell 200, the second filter chamber 220 is disposed between the third partition 430 and the fourth partition 440, the second shell 200 has a discharge portion 210 and a buffer chamber 212, the discharge portion 210 and the fourth partition 440 are spaced apart, the buffer chamber 212 is disposed between the discharge portion 210 and the fourth partition 440 and is communicated with the second filter chamber 220, the discharge portion 210 is provided with a discharge port 211, and the discharge port 211 is communicated with the buffer chamber 212.

[0059] The filtered fluid medium in the second filter chamber 220 enters the buffer chamber 212 and is then discharged through the discharge port 211 . The buffer chamber 212 can buffer the fluid medium to prevent splashing caused by excessive flow rate when the fluid medium is discharged from the discharge port 211 .

[0060] Specifically, see Figure 2 The discharge portion 210 is disposed through the first plate body 131 so that the discharge port 211 protrudes from the first plate body 131 , thereby facilitating the smooth discharge of the fluid medium from the discharge port 211 .

[0061] See also Figure 2 In one embodiment, the second filter tube 320 has a third end 322 and a fourth end 323 opposite to each other. The third end 322 is disposed in the third partition 430 and communicates with the transition chamber 421 . The fourth end 323 is disposed in the fourth partition 440 .

[0062] The fluid medium in the transition chamber 421 can enter the second flow channel 321 through the third end 322 of the second filter tube 320 for subsequent filtering steps. The third end 322 of the second filter tube 320 is inserted into the third partition 430, and the fourth end 323 of the second filter tube 320 is connected to the fourth partition 440. In this way, the second filter tube 320 can be more firmly fixed by the third partition 430 and the fourth partition 440 to prevent the second filter tube 320 from being deformed and damaged, thereby improving the overall service life of the filtering device.

[0063] Furthermore, the fourth end 323 of the second filter tube 320 is sealed and fixed to the fourth partition 440, and the second filter hole is provided on the side wall of the second filter tube 320. In this way, the fluid medium can only flow to the second filter cavity 220 through the second filter hole on the side wall of the second filter tube 320, thereby ensuring the filtering effect and improving the fixing effect of the second filter tube 320.

[0064] Specifically, in one embodiment, the first partition 410, the second partition 420, the third partition 430 and the fourth partition 440 are all sealants. The sealants have good sealing effects, are easy to shape, and have certain adhesion, which facilitates the fixation of the first filter tube 310 and the second filter tube 320, and has low implementation costs.

[0065] See also Figure 2 and Figure 4 In one embodiment, the fourth partition 440 is provided with a second communicating hole 441 , and the second filter cavity 220 is connected to the buffer cavity 212 through the second communicating hole 441 .

[0066] The second filter cavity 220 and the discharge port 211 are connected via the second communication hole 441 , so that the fluid medium filtered by the second filter tube 320 can flow to the discharge port 211 through the second communication hole 441 .

[0067] See also Figure 2 Specifically, the second filter chamber 220 is connected to the buffer chamber 212 through the second connecting hole 441 , and further connected to the discharge port 211 .

[0068] For further information, see Figure 4 The fourth partition 440 is provided with at least two second communication holes 441 to increase the flow rate of the fluid medium when flowing from the second filter cavity 220 to the buffer cavity 212, thereby improving the filtering efficiency.

[0069] See also Figure 2 In one embodiment, the filtering device further includes a disinfection element 500 , which is disposed in the feed chamber 411 .

[0070] The disinfection element 500 can perform preliminary sterilization and disinfection on the fluid medium in the feed cavity 411, further improving the filtering effect of the filtering device.

[0071] Specifically, the disinfection component 500 is an ultraviolet fluorescent lamp, which can radiate short-wave sterilizing ultraviolet rays to sterilize and disinfect the fluid medium.

[0072] Furthermore, a transparent shield is provided on the surface of the ultraviolet fluorescent lamp to prevent the ultraviolet fluorescent lamp from directly contacting the fluid medium.

[0073] Furthermore, it also includes an electric cable, which is electrically connected to the disinfection element 500 to supply power to the disinfection element 500.

[0074] See also Figure 2 In one embodiment, the first housing 100 is provided with a discharge port 140 , and the discharge port 140 is communicated with the first filter cavity 120 .

[0075] When the filter device stops working, the fluid medium in the first filter cavity 120 can be discharged through the discharge port 140 on the first shell 100 to prevent the fluid medium from being retained in the first filter cavity 120 and breeding bacteria or microorganisms.

[0076] See also Figures 2 to 4 In one embodiment, at least two first filter tubes 310 are provided and arranged in parallel with each other.

[0077] With such arrangement, the fluid medium can enter at least two first filter tubes 310 at the same time to perform corresponding filtering steps, thereby improving the filtering efficiency of the filtering device.

[0078] See also Figures 2 to 4 As an embodiment that can be implemented simultaneously with the above-mentioned embodiment, at least two second filter tubes 320 are provided and arranged parallel to each other.

[0079] With such arrangement, the fluid medium can enter at least two second filter tubes 320 at the same time to perform corresponding filtering steps, thereby improving the filtering efficiency of the filtering device.

[0080] It can be understood that the multi-stage filtration of the above-mentioned filtration device can greatly improve the filtration effect of endotoxin and heat source, and the removal rate is increased from the original 3log to 4log. The filtration device in the above-mentioned embodiment can not only be used in the preparation process of water for injection in the pharmaceutical industry, but also can be used in the hemodialysis process in the medical industry, but is not limited to the enumerated embodiments. The contents related to the filtration and separation of liquid materials should be considered to be within the scope of this specification.

[0081] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0082] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A filtering device, characterized in that: include: A first shell and a second shell, wherein the first shell is covered outside the second shell and has a feed port, a side wall of the second shell is spaced apart from the side wall of the first shell to form a first filter cavity, and the second shell has a second filter cavity; A first filter tube, the first filter tube is disposed in the first filter cavity, the first filter tube has a first flow channel and a first filter hole that are connected, the first flow channel is connected to the feed port, and the first filter hole is connected to the first filter cavity; A second filter tube, the second filter tube is disposed in the second filter cavity, the second filter tube has a second flow channel and a second filter hole connected, the second flow channel is connected to the first filter cavity, and the second filter hole is connected to the second filter cavity; The first shell includes a first plate body and a second plate body, the first plate body and the second plate body are spaced apart to form an operation space, the filtering device also includes a first partition and a second partition, the first partition and the second partition are spaced apart in the operation space, the first filter cavity is arranged between the first partition and the second partition, the first partition and the first plate body are spaced apart to form a feed cavity, the feed port is connected with the first filter tube through the feed cavity, the second partition and the second plate body are spaced apart to form a transition cavity, the first filter cavity is connected with the second filter tube through the transition cavity; and A third partition and a fourth partition, the third partition and the fourth partition are arranged in the second shell at intervals, the second filter chamber is arranged between the third partition and the fourth partition, the second shell has a discharge portion and a buffer chamber, the discharge portion and the fourth partition are arranged at intervals, the buffer chamber is arranged between the discharge portion and the fourth partition and is communicated with the second filter chamber, the discharge portion is provided with a discharge port, and the discharge port is communicated with the buffer chamber.

2. The filtering device according to claim 1, characterized in that: The aperture of the second filter hole is smaller than the aperture of the first filter hole.

3. The filtering device according to claim 1, characterized in that: The first filter tube has a first end and a second end opposite to each other, the first end is passed through the first partition and communicated with the feed cavity, and the second end is connected to the second partition.

4. The filtering device according to claim 1, characterized in that: The second partition is provided with a first communicating hole, and the first filter cavity is communicated with the transition cavity through the first communicating hole.

5. The filtering device according to claim 1, characterized in that: The opening direction of the feed port is perpendicular to the extending direction of the first filter tube.

6. The filtering device according to claim 1, characterized in that: The second filter tube has a third end and a fourth end opposite to each other. The third end passes through the third partition and communicates with the transition chamber. The fourth end is disposed at the fourth partition.

7. The filtering device according to claim 1, characterized in that: The fourth partition is provided with a second communicating hole, and the second filter cavity is communicated with the buffer cavity through the second communicating hole.

8. The filtering device according to claim 1, characterized in that: The filtering device further comprises a disinfection component, and the disinfection component is arranged in the feed cavity.

9. The filtering device according to any one of claims 1 to 8, characterized in that: The first shell is provided with a discharge port, and the discharge port is communicated with the first filter cavity.

10. The filtering device according to any one of claims 1 to 8, characterized in that: The first filter tubes are provided with at least two and are arranged parallel to each other; or / and, The second filter tubes are provided with at least two and are arranged parallel to each other.

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