Filtering device and liquid injection equipment

Abstract

The invention discloses a filtering device and liquid injection equipment. The filtering device comprises a machine body, a filter element assembly and a turbulence assembly. Wherein the machine body is provided with a containing cavity, a liquid inlet hole and a liquid outlet hole, and the liquid inlet hole and the liquid outlet hole are communicated with the containing cavity; the filter element assembly is arranged in the accommodating cavity and is communicated with the liquid outlet hole; the turbulence assembly is arranged in the containing cavity and provided with a liquid passing flow channel, the liquid passing flow channel is provided with a flow channel inlet and a flow channel outlet, the flow channel inlet is communicated with the liquid inlet hole, and the flow channel outlet is communicated with the containing cavity. According to the technical scheme, in the using process of the filtering device, the possibility that particle impurities are deposited can be reduced, the particle impurities are intercepted and filtered by the filter element assembly as much as possible, particle impurity escape is reduced, and the filtering efficiency of the filtering device is improved.

Description

Technical Field

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

[0002] During use of the filter device in the related art, some particulate impurities such as metal particles are easily deposited at the bottom of the filter device due to their relatively large density, making them unable to be effectively filtered by the filter element assembly in the filter device. Summary of the invention

[0003] The main purpose of the present application is to provide a filtering device, which aims to reduce the possibility of particle impurities being deposited, so that they can be intercepted and filtered by the filter element assembly as much as possible, reduce the escape of particle impurities, and improve the filtering efficiency of the filtering device.

[0004] To achieve the above purpose, the filtering device proposed in this application includes: The machine body is provided with a containing cavity, a liquid inlet hole and a liquid outlet hole, and the liquid inlet hole and the liquid outlet hole are connected to the containing cavity; A filter element assembly, which is disposed in the accommodating cavity and communicated with the liquid outlet; and The turbulent flow component is arranged in the accommodating chamber, and the turbulent flow component is provided with a liquid flow channel, the liquid flow channel has a flow channel inlet and a flow channel outlet, the flow channel inlet is connected with the liquid inlet hole, and the flow channel outlet is connected with the accommodating chamber.

[0005] The filtering device in the technical solution of the present application is provided with a turbulent component in the accommodating chamber of the body, and the flow channel inlet of the liquid flow channel in the turbulent component is connected to the liquid inlet hole. Therefore, after the liquid enters the filter from the liquid inlet hole, it can enter the liquid flow channel of the turbulent component to be induced to form turbulence. At this time, the turbulence has high-frequency pressure and velocity fluctuations, which can disturb the liquid in the accommodating chamber, so that the particles mixed in the liquid are lifted as much as possible, reducing the possibility of deposition of particulate impurities, so that they are intercepted and filtered by the filter element component as much as possible, reducing the escape of particulate impurities, and improving the filtering efficiency of the filtering device.

[0006] In some embodiments, the liquid flow channel includes an expansion section and a contraction section, the cross-sectional area of ​​the expansion section is larger than the cross-sectional area of ​​the contraction section, and the contraction section has a flow channel outlet. As a result, the liquid flow channel can have a large cross-sectional size change at different sections, which can significantly change the flow rate and pressure distribution of the liquid flowing through, so that the kinetic energy and potential energy of the liquid are continuously converted, and the rapid change of energy will cause the liquid molecules to move violently and collide with each other, thereby effectively forming the required turbulence. Finally, the contraction section forms the flow channel outlet, and the liquid flowing out of the flow channel outlet can still have a large speed and pressure, so as to effectively disturb the unfiltered liquid in the accommodating chamber and improve the lifting effect of particles mixed in the liquid.

[0007] In some embodiments, the number of both the expansion sections and the contraction sections is at least two, and they are arranged alternately. Thereby, the liquid flowing through the liquid passage can alternately pass through the expansion sections and the contraction sections, further improving the effect of changing the flow velocity and pressure distribution of the flowing liquid, so as to better induce the fluid to form turbulence.

[0008] In some embodiments, among the at least two contraction sections, the contraction section with a flow passage outlet is defined as the terminal contraction section; among the at least two expansion sections, the expansion section connected to the terminal contraction section is defined as the terminal expansion section, and the rest are the front expansion sections. The maximum cross-sectional area of the terminal expansion section is larger than the maximum cross-sectional area of the front expansion sections. Thereby, the liquid entering can also be buffered by the terminal expansion section, and at the same time, the change in the cross-sectional size between the terminal expansion section and the contraction section is further increased to enhance the turbulence intensity and flow rate of the liquid, which is further beneficial to improving the perturbation effect on the unfiltered liquid in the accommodation cavity and enhancing the lifting effect on the particulate impurities mixed in the liquid.

[0009] In some embodiments, the maximum cross-sectional area of the front expansion section is defined as S1, and the maximum cross-sectional area of the terminal expansion section is defined as S2, satisfying the relationship: 1.1 ≤ S2 / S1 ≤ 1.5. Thereby, the turbulence effect formed by the liquid flowing through the liquid passage can be improved.

[0010] In some embodiments, in the extending direction of the liquid passage, the cross-sectional areas at both ends of the front expansion section are smaller than the cross-sectional area in the middle, and / or the cross-sectional areas at both ends of the terminal expansion section are smaller than the cross-sectional area in the middle. Thereby, by setting the cross-sectional areas at both ends of the front expansion section to be relatively small and the cross-sectional area in the middle to be relatively large, the front expansion section can better play a role in receiving and guiding the inflowing liquid, and then converge and introduce it into the contraction section, which is beneficial to improving the smoothness of liquid flow and thus the stability of the formed turbulence. By setting the cross-sectional areas at both ends of the terminal expansion section to be relatively small and the cross-sectional area in the middle to be relatively large, the terminal expansion section can better play a role in receiving and guiding the inflowing liquid, and then converge and introduce it into the contraction section, which is beneficial to improving the smoothness of liquid flow and thus the stability of the formed turbulence.

[0011] In some embodiments, when the cross-sectional areas at both ends of the front expansion section are smaller than the cross-sectional area in the middle, the front expansion section includes two first conical ring walls, and the larger cross-sectional area ends of one first conical ring wall are connected to the larger cross-sectional area ends of the other first conical ring wall; and / or, when the cross-sectional areas at both ends of the end expansion section are smaller than the cross-sectional area in the middle, the end expansion section includes a spherical ring wall and a second conical ring wall, the second conical ring wall is located inside the spherical ring wall, and the larger cross-sectional area end of the second conical ring wall is connected to the end of the spherical ring wall close to the flow channel outlet. Thus, including two opposite first conical ring walls in the front expansion section can make the front expansion section improve its regularity on the basis of meeting the condition that the cross-sectional areas at both ends of the front expansion section are smaller than the cross-sectional area in the middle, which is conducive to improving the convenience of processing and forming the front expansion section. Setting the end expansion section to include a spherical ring wall and a second conical ring wall can make the end expansion section expand its cross-sectional area conveniently on the basis of meeting the condition that the cross-sectional areas at both ends of the end expansion section are smaller than the cross-sectional area in the middle, so as to make the maximum cross-sectional area of the end expansion section larger than the maximum cross-sectional area of the front expansion section. At the same time, it can also improve the regularity of the end expansion section, which is conducive to improving the convenience of processing and forming the end expansion section.

[0012] In some embodiments, among at least two contraction sections, the other contraction sections except the end contraction section are defined as the front contraction sections, and the maximum cross-sectional area of the end contraction section is smaller than the maximum cross-sectional area of the front contraction sections. Thus, the flow velocity and pressure of the liquid flowing through the end contraction section can be further increased, so that after flowing out of the turbulence component, the disturbance intensity and range of the unfiltered liquid in the accommodation cavity can be enhanced, and the lifting effect on the particulate impurities mixed in the liquid can be enhanced.

[0013] In some embodiments, the maximum cross-sectional area of the front contraction section is defined as S3, and the maximum cross-sectional area of the end contraction section is defined as S4, satisfying the relationship: 0.1 ≤ S4 / S3 ≤ 0.9. Thus, the disturbance range and intensity of the turbulence formed by the turbulence component on the unfiltered liquid in the accommodation cavity can be better balanced.

[0014] In some embodiments, the maximum cross-sectional area of the front contraction section is defined as S3, and the maximum cross-sectional area of the front expansion section is defined as S1, satisfying the relationship: 1.1 ≤ S1 / S3 ≤ 1.8. Thus, the turbulence effect formed by the liquid flowing through the liquid flow channel can be improved.

[0015] In some embodiments, within the same contraction section, along the extending direction of the liquid - passing flow channel, the cross - sectional areas at various positions of the contraction section are equal; and / or, in a cross - section perpendicular to the extending direction of the liquid - passing flow channel, the cross - section of the liquid - passing flow channel is circular. Thus, setting the cross - sectional areas at various positions in the contraction section to be equal enables the contraction section to uniformly and effectively compress the passing liquid, so that the liquid can form a fluid with a required flow velocity and pressure after passing through the contraction section, promoting the formation of turbulence. Making the cross - section of the liquid - passing flow channel circular can, on the one hand, make the structure of the liquid - passing flow channel more regular and simple, which is conducive to improving the convenience of its processing and forming. On the other hand, it can also reduce the resistance suffered by the liquid when flowing through the liquid - passing flow channel, improving the smoothness of the liquid flowing in the turbulence component.

[0016] In some embodiments, along the extending direction of the liquid - passing flow channel, the extending dimension of the contraction section is greater than that of the expansion section. Thus, it is beneficial to extend the time for the liquid to pass through the contraction section, so as to achieve sufficient contraction, enhance the velocity and pressure obtained by the flowing liquid, increase the velocity change and pressure change of the liquid in the liquid - passing flow channel, and promote the formation of turbulence.

[0017] In some embodiments, along the extending direction of the liquid - passing flow channel, define the extending dimension of the contraction section as L1 and that of the expansion section as L2, satisfying the relationship: 0.6 ≤ L2 / L1 ≤ 0.8. Thus, the extending dimension of the contraction section will not be too short to affect the contraction effect on the flowing liquid. At the same time, the extending dimension of the contraction section will not be too large to affect the expansion and contraction frequency of the liquid and thus affect the turbulence effect.

[0018] In some embodiments, the liquid - passing flow channel further includes a buffer section, and the buffer section has a flow channel inlet; the maximum cross - sectional area of the buffer section is greater than the maximum cross - sectional area of the expansion section, and the minimum cross - sectional area of the buffer section is greater than the maximum cross - sectional area of the contraction section. Thus, the buffer section can buffer the liquid so that there is a sufficient amount of liquid to enter the subsequent expansion section and contraction section, realizing effective expansion and contraction of the liquid.

[0019] In some embodiments, the number of both the expansion section and the contraction section is at least two, and they are arranged alternately, and one end of the buffer section far from the flow channel inlet is connected to a contraction section. Thus, the buffered liquid can directly enter the contraction section for contraction, and the cross - section change between the buffer section and the contraction section is large, which is conducive to improving the contraction effect on the liquid, so as to promote the formation of turbulence.

[0020] In some embodiments, the buffer section includes at least two sub-cavities connected in sequence, and the maximum cross-sectional areas of at least two sub-cavities are reduced in the direction from the flow channel inlet to the flow channel outlet. Thus, the buffer section can smoothly receive the liquid flowing into the liquid inlet hole with a relatively large cross-sectional area, and guide it to the contraction section with a relatively small cross-sectional area.

[0021] In some embodiments, the cache segment includes three sub-cavities, which are defined as a first sub-cavity, a second sub-cavity, and a third sub-cavity; the first sub-cavity and the third sub-cavity are cylindrical cavities, and the second sub-cavity is a spherical cavity. Thus, through the first sub-cavity and the third sub-cavity with cylindrical cavities at both ends, the cache segment can be conveniently docked with the liquid inlet and the contraction segment. And through the setting of the second sub-cavity in the middle with a spherical cavity, a better guiding effect can be achieved for the liquid.

[0022] In some embodiments, the liquid inlet and the liquid outlet are located at the same end of the body, the turbulence component and the filter element component are both extended along the first direction, and the liquid flow channel is extended along the extension direction of the turbulence component. Thus, after the liquid flows through the turbulence formed by the liquid flow channel and flows out through the flow channel outlet, it can flow toward the end away from the liquid inlet and the liquid outlet, so as to move the particles mixed in the liquid toward the end away from the liquid inlet and the liquid outlet as much as possible, so that the particles flow into the end of the filter element component away from the liquid outlet and are intercepted.

[0023] In some embodiments, in the first direction, the accommodating cavity includes a first cavity wall and a second cavity wall that are relatively spaced apart, and the liquid inlet and the liquid outlet are arranged in the first cavity wall; the distance between the end of the filter element assembly away from the first cavity wall and the first cavity wall is defined as L3, and the distance between the end of the turbulence assembly away from the first cavity wall and the first cavity wall is defined as L4, satisfying the relationship: 0.3≤L4 / L3≤0.6. In this way, the utilization rate of the upper part of the filter element assembly and the filtering effect on particles can be better considered.

[0024] In some embodiments, there are two liquid inlet holes, which are located on opposite sides of the liquid outlet hole in the second direction, and the second direction intersects with the first direction; there are two turbulence components, and each turbulence component is arranged corresponding to a liquid inlet hole. Thus, turbulence can be formed by the two turbulence components to disturb the liquid located on opposite sides of the filter element component. At the same time, the number of turbulence components will not be too large, and the turbulence formed will not cause excessive disturbance to the liquid in the accommodating chamber, causing the particulate impurities to fluctuate repeatedly and unable to enter the filter element component for effective filtration.

[0025] In some embodiments, the turbulence component is provided with a first convex portion on the side surface surrounding the liquid flow channel, thereby enabling the liquid flowing through the first convex portion to form auxiliary turbulence, so as to further enhance the lifting effect of particles mixed in the liquid.

[0026] In some embodiments, on opposite sides of the first convex portion in the extending direction of the liquid flow channel, a first guiding surface and a second guiding surface are respectively provided; in the direction from the end of the first convex portion far from the turbulence component to the end close to the turbulence component, the distance between the first guiding surface and the second guiding surface is set to decrease; and / or, the number of the first convex portions is at least two and they are arranged around the turbulence component. Thus, by respectively arranging the two sides of the first convex portion in the extending direction of the liquid flow channel as the first guiding surface and the second guiding surface, the liquid can be guided by the first guiding surface and the second guiding surface, which is conducive to improving the smoothness of the liquid flow. And by setting the number of the first convex portions to at least two and arranging them around the turbulence component, it is convenient to form auxiliary turbulence in the circumferential direction of the turbulence component, improving the lifting effect of the particles mixed in the liquid.

[0027] In some embodiments, the filter element assembly is provided with a liquid outlet channel, the liquid outlet channel is communicated with the liquid outlet hole, and a second convex portion is provided on the side circumferential surface of the filter element assembly around the liquid outlet channel. Thus, through the second convex portion, a mechanical interception barrier can be provided for particulate impurities, so that a part of the particles are first mechanically intercepted on the second convex portion.

[0028] In some embodiments, both the turbulence component and the filter element assembly extend along the first direction and are arranged side by side at intervals in the second direction intersecting the first direction; the distance between the end of the filter element assembly far from the liquid outlet hole and the second convex portion is less than the distance between the end of the filter element assembly far from the liquid outlet hole and the end of the turbulence component far from the liquid inlet hole; and / or, the second convex portion is provided with a third guiding surface, and the third guiding surface is arranged towards the end of the filter element assembly close to the liquid outlet hole; in the direction from the end of the filter element assembly close to the liquid outlet hole to the end far from the liquid outlet hole, the distance between the third guiding surface and the end of the filter element assembly close to the liquid outlet hole is set to increase; and / or, the number of the second convex portions is at least two and they are arranged around the filter element assembly. Thus, by setting the second convex portion higher than the turbulence component, it can be staggered from the turbulence component, which is conducive to improving the compactness of the distribution between the turbulence component and the filter element assembly, so that after the turbulence formed by the turbulence component lifts the particles, it is convenient for the particles to enter the upper part of the filter element assembly, thereby realizing effective filtration. At the same time, the compact distribution between the turbulence component and the filter element assembly can also reduce the excessive occupation of the space in the accommodating cavity. By setting the lower surface of the second convex portion as the third guiding surface, when the liquid flows upward after entering the accommodating cavity, the liquid can be guided by the third guiding surface, which is conducive to improving the smoothness of the liquid flow. By setting the number of the second convex portions to at least two and arranging them around the filter element assembly, the second convex portions can intercept particulate impurities in the circumferential direction of the filter element assembly, further improving the filtering effect on particulate impurities.

[0029] The present application also provides a liquid injection device, including the above-mentioned filtering device. Thus, through the filtering effect of the filtering device on the electrolyte, the possibility of particulate impurities in the electrolyte being injected into the battery device can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application 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 application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0031] Figure 1 is a schematic structural diagram of an embodiment of the filtering device of the present application; Figure 2 is Figure 1 a schematic cross-sectional view of the filtering device in; Figure 3 is Figure 1 a schematic structural diagram of the turbulence component of the filtering device in; Figure 4 is Figure 3 a schematic view of another perspective of the turbulence component in; Figure 5 is Figure 4 a schematic cross-sectional view of the turbulence component in; Figure 6 is Figure 1 a schematic structural diagram of the filter element component of the filtering device in; Figure 7 is Figure 6 a schematic cross-sectional view of the filter element component in; Figure 8 is Figure 2 a schematic structural diagram of the filtering device in removing the filter element component and the turbulence component.

[0032] Explanation of the reference numerals in the drawings: 100. Filter device; 10. Body; 10a. Accommodating cavity; 10a1. First cavity wall; 10a2. Second cavity wall; 11. Base; 11a. Liquid inlet hole; 11b. Liquid outlet hole; 11c. First jack; 11d. Second jack; 13. Cylinder; 20. Filter element assembly; 21. Outer shell; 211. First main body; 2111. Second convex part; 2113. Third guiding surface; 213. First plug post; 23. Filter element; 25. Inner skeleton; 25a. Liquid outlet channel; 30. Turbulence component; 30a. Liquid passing channel; 30a1. Channel inlet; 30a2. Channel outlet; 30a3. Expansion section; 30a31. End expansion section; 30a32. Spherical ring wall; 30a33. Second conical ring wall; 30a34. Front expansion section; 30a35. First conical ring wall; 30a4. Contraction section; 30a41. End contraction section; 30a43. Front contraction section; 30a5. Buffer section; 30a51. Sub-cavity; 30a52. First sub-cavity; 30a53. Second sub-cavity; 30a54. Third sub-cavity; 31. Second main body; 311. First convex part; 3111. First guiding surface; 3113. Second guiding surface; 33. Second plug post; 40. First sealing ring; 50. Second sealing ring; 60. Liquid inlet pipe; 70. Liquid outlet pipe.

[0033] The realization, functional features and advantages of the purpose of this application will be further described in conjunction with the embodiments with reference to the accompanying drawings. Detailed implementation manners

[0034] Next, the technical solutions in the embodiments of this application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of this application.

[0035] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of this application are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0036] In this application, unless otherwise clearly defined and limited, terms such as "connection" and "fixation" shall be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] In addition, in this application, the descriptions involving "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and / or" appearing throughout the text is that it includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or the solution where both A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0038] A filtering device, that is, a device that can be used to intercept particulate impurities mixed in the flowing liquid so as to obtain a relatively clean liquid. It is not only applied in daily life, for example, filtering drinking water; but also applied in industrial production, for example, filtering the electrolyte in the battery production process.

[0039] However, in the process of using the filtering device in the related art, the density of some particulate impurities such as metal particles is relatively large, making it easy to deposit at the bottom of the filtering device, resulting in ineffective filtering by the filter element assembly in the filtering device.

[0040] Therefore, based on the above considerations, in order to solve the problem that the filtering efficiency of the filtering device in the related art is affected by the easy deposition of particulate impurities, this application proposes a new type of filtering device. This filtering device innovatively sets a turbulence component communicated with the liquid inlet hole in the accommodating cavity, so that the liquid entering from the liquid inlet hole can form turbulence after passing through the turbulence component, having high-frequency pressure and velocity fluctuations, capable of disturbing the liquid in the accommodating cavity, raising the particulate matter mixed in the liquid as much as possible, reducing the possibility of particulate impurities depositing, and realizing that the particulate impurities can be intercepted and filtered by the filter element assembly located in the accommodating cavity as much as possible.

[0041] In addition, it should be noted that the filtration device proposed in this application can be used not only to filter electrolyte as introduced above, but also to filter deionized water, or to filter N-methylpyrrolidone, etc. It can be seen that the application scenarios of the proposed filtration device are not limited in this application.

[0042] Next, the structure of the filtration device proposed in this application will be explained by way of examples: Please refer to Figures 1 to 4 , in an embodiment of this application, the filtration device 100 proposed in this application includes a body 10, a filter element assembly 20, and a turbulence assembly 30. The body 10 is provided with a receiving cavity 10a, a liquid inlet hole 11a, and a liquid outlet hole 11b. The liquid inlet hole 11a and the liquid outlet hole 11b communicate with the receiving cavity 10a; the filter element assembly 20 is arranged in the receiving cavity 10a and communicates with the liquid outlet hole 11b; the turbulence assembly 30 is arranged in the receiving cavity 10a. The turbulence assembly 30 is provided with a liquid passing channel 30a. The liquid passing channel 30a has a channel inlet 30a1 and a channel outlet 30a2. The channel inlet 30a1 communicates with the liquid inlet hole 11a, and the channel outlet 30a2 communicates with the receiving cavity 10a.

[0043] The body 10 can be used to form a receiving cavity 10a for receiving components such as a filter element assembly 20 and a turbulence assembly 30, so that each component in the filtering device 100 can be assembled into a whole for use. At the same time, the body 10 can also be used to form a liquid inlet hole 11a and a liquid outlet hole 11b, through which the liquid to be filtered enters through the liquid inlet hole 11a, and the filtered liquid can flow out through the liquid outlet hole 11b. Among them, the body 10 can be arranged to extend in the first direction. On the projection plane perpendicular to the first direction, the projection of the body 10 can be circular, and of course it can also be square, rectangular, etc. The present application does not limit the shape of the body 10. In addition, in the first direction, the body 10 can include a base 11 and a cylinder 13 with an open end at one end, and the receiving cavity 10a is formed by enclosing the two. Of course, the body 10 can also include at least two split parts in the second direction intersecting the first direction, and the receiving cavity 10a is formed by enclosing the at least two split parts. It can be seen that the present application does not limit the structural type of the body 10 either. It should be noted that when the filtering device 100 is in a normal installation and use state, with the ground as a reference, the first direction can be the up-down direction, and of course it can also be the horizontal direction. The present application does not limit the specific type of the first direction either. In addition, the shape of the receiving cavity 10a can follow the shape of the body 10. For example, when the projection of the body 10 in the first direction is circular, the projection of the receiving cavity 10a in the first direction can also be circular, so as to maximize the volume of the receiving cavity 10a within the limited volume of the body 10. Of course, the present application is not limited to this, and the shape of the receiving cavity 10a and the shape of the body 10 can also be set to be different. In addition, the shape of the liquid inlet hole 11a can be circular, and of course it can also be square, rectangular, etc. The present application does not limit the shape of the liquid inlet hole 11a. The number of the liquid inlet holes 11a can be one, and of course it can also be two or more. The present application does not limit the number of the liquid inlet holes 11a either. Similarly, the shape of the liquid outlet hole 11b can be circular, and of course it can also be square, rectangular, etc. The present application does not limit the shape of the liquid outlet hole 11b. The number of the liquid outlet holes 11b can be one, and of course it can also be two or more. The present application does not limit the number of the liquid outlet holes 11b either. In addition, the liquid inlet hole 11a and the liquid outlet hole 11b can be arranged on the same surface of the body 10, and of course they can also be respectively arranged on two adjacent surfaces of the body 10. The present application does not limit the relative positional relationship between the liquid inlet hole 11a and the liquid outlet hole 11b. In order to facilitate the shape of the liquid inlet hole 11a and the liquid outlet hole 11b, as well as the installation and docking of the external pipeline with the liquid inlet hole 11a and the liquid outlet hole 11b, in an embodiment, the liquid inlet hole 11a and the liquid outlet hole 11b can be arranged at the same end of the body 10.

[0044] The filter element assembly 20 can be used to filter the particulate impurities contained in the flowing liquid. Among them, please refer to Figure 6 and Figure 7 , the filter element assembly 20 can include a housing 21, a filter element 23 and an inner skeleton 25; the housing 21 can be provided with mesh holes communicating with its inner side; the inner skeleton 25 can be arranged inside the housing 21 and enclose a liquid outlet channel 25a, and the liquid outlet channel 25a can communicate with the liquid outlet hole 11b on the machine body 10; the filter element 23 can surround the outer side of the inner skeleton 25. Therefore, the unfiltered liquid located in the accommodation cavity 10a of the machine body 10 can enter the inner side of the housing 21 through the mesh holes on the housing 21 of the filter element assembly 20, and then when passing through the filter element 23 located between the housing 21 and the inner skeleton 25, the particulate impurities contained in the liquid can be filtered, and the filtered liquid can enter the liquid outlet channel 25a enclosed by the inner skeleton 25, and then flow out from the liquid outlet hole 11b on the machine body 10. Among them, the inner skeleton 25 can be a cylindrical structure and is provided with mesh holes for the liquid to enter the liquid outlet channel 25a. Of course, the inner skeleton 25 can also be an annular grid structure. The present application does not limit the structural type of the inner skeleton 25, as long as it is ensured that the liquid can enter the liquid outlet channel 25a enclosed by the inner skeleton 25 after passing through the filtration of the filter element 23. In addition, in some embodiments, the liquid outlet channel 25a can also be jointly enclosed by the filter element 23 and the inner skeleton 25. In addition, the filter element assembly 20 can be extended along with the extension direction of the machine body 10. For example, it can be extended along the first direction along with the machine body 10 to make full use of the space of the accommodation cavity 10a of the machine body 10. Of course, the extension direction of the filter element assembly 20 can also be set at an angle with the extension direction of the machine body 10. For example, angles such as 10°, 15° or 20° can be formed. In addition, the filter element assembly 20 can be directly connected to the machine body 10, and of course it can also be indirectly installed on the machine body 10 through an intermediate carrier. Moreover, the filter element assembly 20 can be detachably installed on the machine body 10 so that it can be replaced after the filter element assembly 20 has been used for a period of time. The detachable connection method can be any connection method such as threaded connection, snap connection or interference fit. In addition, the number of the filter element assemblies 20 can be one, and of course it can also be two or more.

[0045] The turbulence component 30 can be used to induce the flowing liquid to form turbulence through the liquid flow channel 30a, so as to lift the particulate impurities mixed in the unfiltered liquid located in the accommodation cavity 10a, and make them enter the filter element assembly 20 as much as possible following the liquid and be intercepted and filtered by the filter element assembly 20. Among them, the turbulence component 30 can be a structural form in which the liquid flow channel 30a is provided with a diverging section 30a3 and a converging section 30a4 as introduced below to induce the flowing liquid to form turbulence. Of course, it can also be a structural form in which the liquid flow channel 30a of the turbulence component 30 is provided with at least two flow channels with different roughnesses to induce the flowing liquid to form turbulence. Or, the liquid flow channel 30a can be set in a spiral extension structure form to induce the flowing liquid to form turbulence. It can be seen that the application does not limit the structural form of the liquid flow channel 30a of the turbulence component 30. In addition, in the cross-section perpendicular to the extension direction of the liquid flow channel 30a, the cross-section of the liquid flow channel 30a can be circular, and of course, it can also be square or rectangular. In addition, the extension direction of the liquid flow channel 30a can be set to be the same as the extension direction of the turbulence component 30, and of course, it can also be set to be different. In addition, the flow channel inlet 30a1 and the flow channel outlet 30a2 of the liquid flow channel 30a can be respectively arranged on the opposite sides of the turbulence component 30, or can be arranged on the adjacent sides of the turbulence component 30. In addition, the turbulence component 30 can be provided with one liquid flow channel 30a, and of course, it can also be provided with two liquid flow channels 30a or more liquid flow channels 30a. In addition, the turbulence component 30 can be in a linear structure, and of course, it can also be in a polyline structure including at least two sections arranged at an angle, or in a spiral structure. In addition, the number of the turbulence components 30 can be one, and of course, it can also be two or more. In order to induce the flowing liquid to form turbulence at each liquid inlet hole 11a, the number of the turbulence components 30 can be set corresponding to the liquid inlet holes 11a. Of course, it can also be that only some of the liquid inlet holes 11a are correspondingly provided with the turbulence components 30. In addition, the turbulence component 30 can be directly connected to the machine body 10, and of course, it can also be indirectly installed on the machine body 10 through an intermediate carrier. Moreover, the turbulence component 30 can be detachably installed on the machine body 10 so that the turbulence component 30 can be cleaned after being used for a period of time. The detachable connection method can be any connection method such as threaded connection, snap connection or interference fit connection.

[0046] The filter device 100 in the technical solution of the present application is provided with a turbulence component 30 in the accommodating chamber 10a of the body 10, and the flow channel inlet 30a1 of the liquid flow channel 30a in the turbulence component 30 is connected with the liquid inlet hole 11a. Therefore, after the liquid enters the filter from the liquid inlet hole 11a, it can enter the liquid flow channel 30a of the turbulence component 30 to be induced to form turbulence. At this time, the turbulence has high-frequency pressure and velocity fluctuations, which can disturb the liquid in the accommodating chamber 10a, so that the particles mixed in the liquid are lifted as much as possible, reducing the possibility of deposition of particulate impurities, so that they are intercepted and filtered by the filter element component 20 as much as possible, reducing the escape of particulate impurities, and improving the filtering efficiency of the filter device 100.

[0047] Please refer to Figures 3 to 5 In one embodiment of the present application, the liquid flow channel 30a includes an expansion section 30a3 and a contraction section 30a4, the cross-sectional area of ​​the expansion section 30a3 is larger than the cross-sectional area of ​​the contraction section 30a4, and the contraction section 30a4 has a flow channel outlet 30a2.

[0048] The diverging section 30a3 and the converging section 30a4, that is, on the cross-section perpendicular to the extending direction of the liquid flow channel 30a, or on the cross-section parallel to the extending direction of the liquid flow channel 30a, the cross-sectional area of the diverging section 30a3 is larger than that of the converging section 30a4. Among them, in the liquid flowing direction of the liquid flow channel 30a, when the flow channel inlet 30a1 and the flow channel outlet 30a2 are located on the opposite sides of the turbulent component 30, that is, in the direction from the flow channel inlet 30a1 to the flow channel outlet 30a2, the cross-sectional area of the diverging section 30a3 can be set to vary, or of course can be set to be equal; similarly, the cross-sectional area of the converging section 30a4 can be set to vary, or of course can be set to be equal. Moreover, on the projection plane perpendicular to the liquid flowing direction of the liquid flow channel 30a, the projection of the diverging section 30a3 can be circular, square or rectangular, etc., and the projection of the converging section 30a4 can also be circular, square or rectangular, etc. It can be seen that the present application does not limit the shapes of both the diverging section 30a3 and the converging section 30a4. Among them, when the cross-sectional area of the diverging section 30a3 is set to vary and the cross-sectional area of the converging section 30a4 is also set to vary, the minimum cross-sectional area of the diverging section 30a3 can be greater than the maximum cross-sectional area of the converging section 30a4. In addition, the number of the diverging sections 30a3 can be one, or of course can be two or more. Similarly, the number of the converging sections 30a4 can be one, or of course can be two or more. Moreover, the number of the diverging sections 30a3 and the number of the converging sections 30a4 can be set to be the same, or of course can be set to be different. In addition, the flow channel inlet 30a1 can be directly provided on the diverging section 30a3, or of course can be provided on the buffer section 30a5 in the liquid flow channel 30a as introduced below, or when the number of the converging sections 30a4 is at least two, the flow channel inlet 30a1 can be provided on the converging section 30a4.

[0049] In this embodiment, setting the liquid flow channel 30a to include the diverging section 30a3 and the converging section 30a4 can cause the liquid flow channel 30a to have a large change in cross-sectional size at different section bodies, that is, at the diverging section 30a3 and the converging section 30a4, which can significantly change the flow velocity and pressure distribution of the flowing liquid, enabling the continuous conversion of the kinetic energy and potential energy of the liquid. And the rapid change of energy will cause the violent movement and mutual collision of liquid molecules, thereby effectively forming the required turbulence. Moreover, finally, the converging section 30a4 is used to form the flow channel outlet 30a2, which can also make the liquid flowing out of the flow channel outlet 30a2 still have a relatively large speed and pressure, so as to effectively disturb the unfiltered liquid in the accommodation cavity 10a and improve the lifting effect on the particles mixed in the liquid.

[0050] Please refer to Figures 3 to 5, in an embodiment of the present application, the number of the expansion sections 30a3 and the contraction sections 30a4 is at least two, and they are arranged alternately.

[0051] The alternate arrangement means that, in the extending direction of the liquid passing channel 30a, the contraction section 30a4 is arranged upstream and / or downstream of the expansion section 30a3. Among them, the cross-sectional sizes and shapes of the respective expansion sections 30a3 can be set to be the same. Of course, the cross-sectional sizes and shapes of the respective expansion sections 30a3 can also be set to be different. Similarly, the cross-sectional sizes and shapes of the respective contraction sections 30a4 can be set to be the same. Of course, the cross-sectional sizes and shapes of the respective contraction sections 30a4 can also be set to be different.

[0052] In this embodiment, the number of the expansion sections 30a3 and the contraction sections 30a4 is set to be at least two and arranged alternately, so that the liquid flowing through the liquid passing channel can alternately pass through the expansion section 30a3 and the contraction section 30a4, further improving the effect of changing the flow velocity and pressure distribution of the flowing liquid, so as to better induce the fluid to form turbulence.

[0053] Please refer to Figure 4 and Figure 5 , in an embodiment of the present application, among at least two contraction sections 30a4, the contraction section 30a4 having the flow channel outlet 30a2 is defined as the end contraction section 30a41; among at least two expansion sections 30a3, the expansion section 30a3 connected to the end contraction section 30a41 is defined as the end expansion section 30a31, and the rest are the front expansion sections 30a34. The maximum cross-sectional area of the end expansion section 30a31 is larger than the maximum cross-sectional area of the front expansion section 30a34.

[0054] The end contraction section 30a41 is located at the tail end of the turbulence component 30 in the liquid passing direction of the liquid passing channel 30a. The number of the front expansion sections 30a34 can be one, and of course, it can also be two or more. Among them, when the cross-section of the expansion section 30a3 changes in the liquid passing direction of the liquid passing channel 30a, the cross-section at the maximum cross-sectional area is the maximum cross-section of the expansion section 30a3. When the cross-sections of the expansion section 30a3 are equal in the liquid passing direction of the liquid passing channel 30a, any cross-section is the maximum cross-section of the expansion section 30a3. In addition, the cross-sectional sizes and shapes of the respective front expansion sections 30a34 can be set to be the same. Of course, the cross-sectional sizes and shapes of the respective front expansion sections 30a34 can also be set to be different.

[0055] In this embodiment, the maximum cross-sectional area of the end expansion section 30a31 is set to be larger than the cross-sectional area of the front expansion section 30a34, so that the incoming liquid can also be buffered by the end expansion section 30a31. At the same time, the change in the cross-sectional size between the end expansion section 30a31 and the contraction section 30a4 is further increased to enhance the turbulence intensity and flow rate of the liquid, thereby facilitating further improvement of the disturbance effect on the unfiltered liquid in the accommodation cavity 10a and enhancing the lifting effect on the particulate impurities mixed in the liquid.

[0056] In an embodiment of the present application, the maximum cross-sectional area of the front expansion section 30a34 is defined as S1, and the maximum cross-sectional area of the end expansion section 30a31 is defined as S2, satisfying the relationship: 1.1 ≤ S2 / S1 ≤ 1.5.

[0057] In this embodiment, setting the ratio of the maximum cross-sectional area S2 of the end expansion section 30a31 to the maximum cross-sectional area S1 of the front expansion section 30a34 to be between 1.1 and 1.5 can prevent the maximum cross-sectional area of the end expansion section 30a31 from being too small, which may affect the cross-sectional change effect of the liquid flow channel 30a at the expansion section 30a3 and the contraction section 30a4, thereby weakening the change effect on the flow velocity and pressure distribution of the flowing liquid and affecting the formed turbulence effect. At the same time, it also prevents the maximum cross-sectional area of the end expansion section 30a31 from being too large, which may cause excessive decrease in the flow velocity and energy of the liquid and affect the formed turbulence effect. Therefore, setting the ratio range of S2 to S1 in this way can improve the turbulence effect formed by the liquid flowing through the liquid flow channel 30a. The ratio of S2 to S1 can be 1.1, 1.2, 1.3, 1.4, or 1.5, and of course, it can also be any value within the above range.

[0058] Please refer to Figure 4 and Figure 5 In an embodiment of the present application, in the extending direction of the liquid flow channel 30a, the cross-sectional areas at both ends of the front expansion section 30a34 are smaller than the cross-sectional area in the middle.

[0059] The cross-sectional areas at both ends of the front expansion section 30a34 are smaller than the cross-sectional area in the middle, that is, in the extending direction of the liquid flow channel 30a, the cross-sectional area of the front expansion section 30a34 is set to increase first and then decrease. Among them, the front expansion section 30a34 may include two oppositely arranged first conical ring walls 30a35 as described below to form a trend of increasing first and then decreasing cross-sectional area of the front expansion section 30a34. Of course, the front expansion section 30a34 can also be set as a spherical cavity to form a trend of increasing first and then decreasing cross-sectional area of the front expansion section 30a34.

[0060] In this embodiment, the cross-sectional areas at both ends of the front expansion section 30a34 are set to be relatively small, and the cross-sectional area in the middle is set to be relatively large, so that the front expansion section 30a34 can better receive and guide the inflowing liquid, and then converge and introduce it into the contraction section 30a4, which is beneficial to improving the smoothness of liquid flow and the stability of the formed turbulent flow. At the same time, such a setting also makes the cross-sectional area of the front expansion section 30a34 vary in the liquid flow direction of the liquid flow channel 30a, so that the velocity and pressure distribution of the flowing liquid can be changed, which is beneficial to enhancing the induction effect on the formation of turbulent flow.

[0061] Please refer to Figure 5 , in an embodiment of the present application, the front expansion section 30a34 includes two first conical ring walls 30a35, and the end with a larger cross-sectional area in one first conical ring wall 30a35 is connected to the end with a larger cross-sectional area in the other first conical ring wall 30a35.

[0062] The conical ring wall, that is, a conical annular wall surface, has an opening at one end larger than that at the other end in the extending direction of the liquid flow channel 30a. Therefore, the end with a larger cross-sectional area in one first conical ring wall 30a35 is connected to the end with a larger cross-sectional area in the other first conical ring wall 30a35, which can also be said that the end with a larger opening in one first conical ring wall 30a35 is connected to the end with a larger opening in the other first conical ring wall 30a35.

[0063] In this embodiment, including two opposite first conical ring walls 30a35 in the front expansion section 30a34 can make the front expansion section 30a34 meet the requirement that the cross-sectional areas at both ends of the front expansion section 30a34 are smaller than the cross-sectional area in the middle, and can improve the regularity of the front expansion section 30a34, which is beneficial to improving the convenience of processing and forming the front expansion section 30a34.

[0064] Please refer to in combination Figure 4 and Figure 5 , in an embodiment of the present application, in the extending direction of the liquid flow channel 30a, the cross-sectional areas at both ends of the end expansion section 30a31 are smaller than the cross-sectional area in the middle.

[0065] The cross-sectional areas at both ends of the terminal expansion section 30a31 are smaller than the cross-sectional area in the middle. That is, in the extending direction of the liquid flow channel 30a, the cross-sectional area of the terminal expansion section 30a31 is set to increase first and then decrease. Among them, the terminal expansion section 30a31 can include a spherical annular wall 30a32 and a second conical annular wall 30a33 as introduced below, so as to form a trend that the cross-sectional area of the terminal expansion section 30a31 increases first and then decreases. Of course, it can also be similar to the front expansion section 30a34 including two opposite second conical annular walls 30a33 to form a trend that the cross-sectional area of the terminal expansion section 30a31 increases first and then decreases.

[0066] In this embodiment, the cross-sectional areas at both ends of the terminal expansion section 30a31 are set to be relatively small, and the cross-sectional area in the middle is set to be relatively large, so that the terminal expansion section 30a31 can better receive and guide the inflowing liquid, and then converge and introduce it into the contraction section 30a4, which is beneficial to improving the smoothness of liquid flow and the stability of the formed turbulent flow. At the same time, such a setting also makes the cross-sectional area of the terminal expansion section 30a31 change in the liquid passing direction of the liquid flow channel 30a, so that the velocity and pressure distribution of the flowing liquid can be changed, which is beneficial to enhancing the induction formation effect on the turbulent flow.

[0067] Please refer to Figure 5 , in an embodiment of the present application, the terminal expansion section 30a31 includes a spherical annular wall 30a32 and a second conical annular wall 30a33. The second conical annular wall 30a33 is located inside the spherical annular wall 30a32, and the end with the larger cross-sectional area in the second conical annular wall 30a33 is connected to the end of the spherical annular wall 30a32 close to the flow channel outlet 30a2.

[0068] The spherical annular wall 30a32 is an annular wall surface in a spherical shape.

[0069] In this embodiment, setting the terminal expansion section 30a31 to include a spherical annular wall 30a32 and a second conical annular wall 30a33 can make the terminal expansion section 30a31, on the basis of satisfying that the cross-sectional areas at both ends of the terminal expansion section 30a31 are smaller than the cross-sectional area in the middle, facilitate the expansion of the cross-sectional area of the terminal expansion section 30a31 to achieve that the maximum cross-sectional area of the terminal expansion section 30a31 introduced above is larger than the maximum cross-sectional area of the front expansion section 30a34. At the same time, it can also improve the regularity of the terminal expansion section 30a31, which is beneficial to improving the convenience of processing and forming the terminal expansion section 30a31.

[0070] Please refer to in combination Figure 4 and Figure 5, in an embodiment of the present application, among at least two constriction segments 30a4, the constriction segments 30a4 other than the terminal constriction segment 30a41 are defined as the front constriction segments 30a43, and the maximum cross-sectional area of the terminal constriction segment 30a41 is smaller than the maximum cross-sectional area of the front constriction segments 30a43.

[0071] The number of the front constriction segments 30a43 can be one, or of course at least two. Among them, in the liquid flow direction of the liquid flow channel 30a, when the cross-section of the constriction segment 30a4 is variably arranged, the cross-section at the maximum cross-sectional area is the maximum cross-section of the constriction segment 30a4. In the liquid flow direction of the liquid flow channel 30a, when the cross-sections of the constriction segment 30a4 are equal everywhere, any cross-section is the maximum cross-section of the constriction segment 30a4. In addition, the cross-sectional sizes and shapes of the respective front constriction segments 30a43 can be set to be the same. Of course, the cross-sectional sizes and shapes of the respective front constriction segments 30a43 can also be set to be different.

[0072] In this embodiment, setting the maximum cross-sectional area of the terminal constriction segment 30a41 to be smaller than the maximum cross-sectional area of the front constriction segments 30a43 can further increase the flow velocity and pressure of the liquid flowing through the terminal constriction segment 30a41, so that after flowing out of the turbulence component 30, the perturbation intensity and range of the unfiltered liquid located in the accommodation cavity 10a can be enhanced, and the lifting effect on the particulate impurities mixed in the liquid can be enhanced.

[0073] In an embodiment of the present application, the maximum cross-sectional area of the front constriction segment 30a43 is defined as S3, and the maximum cross-sectional area of the terminal constriction segment 30a41 is defined as S4, satisfying the relationship: 0.1 ≤ S4 / S3 ≤ 0.9.

[0074] In this embodiment, setting the ratio of the maximum cross-sectional area S4 of the terminal constriction segment 30a41 to the maximum cross-sectional area S3 of the front constriction segments 30a43 to be from 0.1 to 0.9 can prevent the maximum cross-sectional area of the terminal constriction segment 30a41 from being too small to affect the flow rate of the liquid flowing out of the turbulence component 30 and thus affect the perturbation range of the turbulence. At the same time, it also prevents the maximum cross-sectional area of the terminal constriction segment 30a41 from being too large to affect the flow rate of the liquid flowing out of the turbulence component 30 and thus affect the perturbation intensity of the turbulence. Therefore, setting the ratio range of S4 to S3 in this way can better balance the perturbation range and intensity of the turbulence formed by the turbulence component 30 on the unfiltered liquid located in the accommodation cavity 10a. Among them, the ratio of S4 to S3 can be 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8 or 0.9, or of course any value within the above range.

[0075] In an embodiment of the present application, the maximum cross-sectional area of the front contraction section 30a43 is defined as S3, and the maximum cross-sectional area of the front expansion section 30a34 is defined as S1, satisfying the relationship: 1.1 ≤ S1 / S3 ≤ 1.8.

[0076] In this embodiment, setting the ratio of the maximum cross-sectional area S1 of the front expansion section 30a34 to the maximum cross-sectional area S3 of the front contraction section 30a43 to be between 1.1 and 1.8 can prevent the maximum cross-sectional area of the front expansion section 30a34 from being too small, which may affect the cross-sectional change effect of the liquid flow channel 30a at the expansion section 30a3 and the contraction section 30a4, thereby weakening the change effect on the flow rate and pressure distribution of the flowing liquid and affecting the formed turbulent flow effect. At the same time, it also prevents the maximum cross-sectional area of the front expansion section 30a34 from being too large, which may cause too large a decrease in the flow rate and energy of the liquid, affecting the formed turbulent flow effect. Therefore, setting the ratio range of S1 to S3 in this way can improve the turbulent flow effect formed by the liquid flowing through the liquid flow channel 30a. The ratio of S1 to S3 can be 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, or 1.8, and of course, it can also be any value within the above range.

[0077] Please refer to Figure 4 and Figure 5 , in an embodiment of the present application, in the same contraction section 30a4, along the extension direction of the liquid flow channel 30a, the cross-sectional areas at each part of the contraction section 30a4 are equal.

[0078] In this embodiment, setting the cross-sectional areas at each part of the contraction section 30a4 to be equal enables each part of the contraction section 30a4 to uniformly and effectively compress the flowing liquid, so that the liquid can form a fluid with a required flow rate and pressure after passing through the contraction section 30a4, promoting the formation of turbulent flow. At the same time, setting it in this way can also make the structure of the contraction section 30a4 more regular, which is conducive to improving the convenience of its processing and forming.

[0079] Please refer to Figure 4 and Figure 5 , in an embodiment of the present application, along the extension direction of the liquid flow channel 30a, the extension dimension of the contraction section 30a4 is greater than the extension dimension of the expansion section 30a3.

[0080] In this embodiment, setting the extension dimension of the contraction section 30a4 to be greater than the extension dimension of the expansion section 30a3 is beneficial to prolonging the time for the liquid to pass through the contraction section 30a4, so as to achieve sufficient contraction, enhance the velocity and pressure obtained by the flowing liquid, increase the velocity change and pressure change of the liquid in the liquid flow channel 30a, and promote the formation of turbulent flow.

[0081] Please refer to Figure 5, in an embodiment of the present application, in the extending direction of the liquid passing channel 30a, the extending dimension of the contraction section 30a4 is defined as L1, and the extending dimension of the expansion section 30a3 is defined as L2, satisfying the relationship: 0.6 ≤ L2 / L1 ≤ 0.8.

[0082] The extending dimension of the contraction section 30a4 is L1, including the extending dimension of the front contraction section 30a43 as L1, and also including the extending dimension of the end contraction section 30a41 as L1. The extending dimension of the expansion section 30a3 is L2, including the extending dimension of the front expansion section 30a34 as L2, and also including the extending dimension of the end expansion section 30a31 as L2.

[0083] In this embodiment, setting the ratio of L2 to L1 to be 0.6 to 0.8 can prevent the extending dimension of the contraction section 30a4 from being too short to affect the contraction effect on the flowing liquid. At the same time, it can also prevent the extending dimension of the contraction section 30a4 from being too large to affect the frequency of liquid expansion and contraction and thus affect the turbulence effect. Among them, the ratio of L2 to L1 can be 0.6, 0.7 or 0.8, and of course it can also be any value within the above range.

[0084] Please refer to Figures 3 to 5 , in an embodiment of the present application, the liquid passing channel 30a further includes a buffer section 30a5, and the buffer section 30a5 has a channel inlet 30a1; the maximum cross-sectional area of the buffer section 30a5 is greater than the maximum cross-sectional area of the expansion section 30a3, and the minimum cross-sectional area of the buffer section 30a5 is greater than the maximum cross-sectional area of the contraction section 30a4.

[0085] The buffer section 30a5 can be used to buffer the inflowing liquid. Among them, in the liquid passing direction of the liquid passing channel 30a, the cross-sectional area of the buffer section 30a5 can be variably set, and of course it can also be equally set. Moreover, on the projection plane perpendicular to the liquid passing direction of the liquid passing channel 30a, the projection of the buffer section 30a5 can be circular, and of course it can also be square or rectangular, etc. It can be seen that the present application does not limit the shape of the buffer section 30a5. Among them, when the cross-sectional area of the buffer section 30a5 is variably set, the cross-section at the maximum cross-sectional area is the maximum cross-section of the buffer section 30a5, and the cross-section at the minimum cross-sectional area is the minimum cross-section of the buffer section 30a5. When the cross-sectional areas of the buffer section 30a5 are equally set in the liquid passing direction of the liquid passing channel 30a, any cross-section is the maximum cross-section of the buffer section 30a5, and it can also be said to be the minimum cross-section. In addition, the buffer section 30a5 can be connected to the contraction section 30a4 as introduced below, or it can be connected to the expansion section 30a3.

[0086] In this embodiment, the liquid flow channel 30a further includes a buffer section 30a5 upstream of the contraction section 30a4, so that the liquid can be buffered through the buffer section 30a5, so as to have a sufficient amount of liquid to enter the subsequent expansion section 30a3 and contraction section 30a4, realizing effective expansion and contraction of the liquid.

[0087] Please refer to Figure 4 and Figure 5 , in an embodiment of the present application, one end of the buffer section 30a5 far from the flow channel inlet 30a1 communicates with a contraction section 30a4.

[0088] In this embodiment, the buffer section 30a5 is communicated with the contraction section 30a4, so that the buffered liquid can directly enter the contraction section 30a4 for contraction. The cross-sectional changes between the buffer section 30a5 and the contraction section 30a4 are relatively large, which is conducive to improving the contraction effect on the liquid, so as to promote the formation of turbulence. At the same time, it can also enable the liquid to obtain sufficient flow velocity and pressure after passing through the contraction section 30a4 communicated with the buffer section 30a5, and then obtain sufficient energy to stably complete the flow of the subsequent part of the liquid flow channel 30a at a required flow velocity and pressure, improving the stability of the formed turbulence.

[0089] Please refer to Figure 4 and Figure 5 , in an embodiment of the present application, the buffer section 30a5 includes at least two sub-cavities 30a51 connected in sequence, and in the direction from the flow channel inlet 30a1 to the flow channel outlet 30a2, the maximum cross-sectional areas of the at least two sub-cavities 30a51 are arranged to decrease.

[0090] In this embodiment, the buffer section 30a5 is set to include at least two sub-cavities 30a51, and the maximum cross-sectional areas of the at least two sub-cavities 30a51 are arranged to decrease in the direction from the flow channel inlet 30a1 to the flow channel outlet 30a2, so that the buffer section 30a5 can smoothly receive the liquid flowing in from the liquid inlet hole 11a with a relatively large cross-sectional area and divert it into the contraction section 30a4 with a relatively small cross-sectional area.

[0091] Please refer to Figure 4 and Figure 5 , in an embodiment of the present application, the buffer section 30a5 includes three sub-cavities 30a51, and the three sub-cavities 30a51 are defined as the first sub-cavity 30a52, the second sub-cavity 30a53 and the third sub-cavity 30a54 respectively; the first sub-cavity 30a52 and the third sub-cavity 30a54 are cylindrical cavities, and the second sub-cavity 30a53 is a spherical cavity.

[0092] In this embodiment, the buffer section 30a5 is set to include a first sub-chamber 30a52 and a third sub-chamber 30a54 with cylindrical cavities at both ends, which can facilitate the docking of the buffer section 30a5 with the liquid inlet hole 11a and the contraction section 30a4. The setting of the middle second sub-chamber 30a53 with a spherical cavity can have a better guiding effect on the liquid.

[0093] Please refer to Figure 3 , in an embodiment of the present application, in a cross-section perpendicular to the extension direction of the liquid flow channel 30a, the cross-section of the liquid flow channel 30a is circular.

[0094] In this embodiment, the cross-section of the liquid flow channel 30a is circular. On the one hand, it can make the structure of the liquid flow channel 30a more regular and simple, which is conducive to improving the convenience of its processing and forming. On the other hand, it can also reduce the resistance suffered by the liquid when flowing through the liquid flow channel 30a and improve the smoothness of the liquid flowing through the turbulence component 30.

[0095] Please refer to in combination Figures 1 to 5 , in an embodiment of the present application, the liquid inlet hole 11a and the liquid outlet hole 11b are located at the same end of the body 10. The turbulence component 30 and the filter element component 20 are both arranged to extend along the first direction, and the liquid flow channel 30a extends along the extension direction of the turbulence component 30.

[0096] When the first direction is the up and down direction, the liquid inlet hole 11a and the liquid outlet hole 11b can be arranged at the lower end of the body 10. When the body 10 includes the base 11 and the cylinder 13 as introduced above, the liquid inlet hole 11a and the liquid outlet hole 11b can be arranged on the base 11 of the body 10.

[0097] In this embodiment, the turbulence component 30 and the filter element component 20 are both arranged to extend along the first direction and connected to the same end of the body 10, and the liquid flow channel 30a extends along the extension direction of the turbulence component 30. After the turbulence formed by the liquid flowing through the liquid flow channel 30a flows out through the flow channel outlet 30a2, it can flow towards the end away from the liquid inlet hole 11a and the liquid outlet hole 11b, so as to move the particles mixed in the liquid towards the end away from the liquid inlet hole 11a and the liquid outlet hole 11b as much as possible, and realize that the particles flow into the filter element component 20 with the liquid and are intercepted in the end away from the liquid outlet hole 11b. That is, when the first direction is the up and down direction, the particles can be lifted up and down as much as possible and enter the upper part of the filter element component 20 to be intercepted and filtered, improving the utilization rate of the upper part of the filter element component 20.

[0098] Please refer to in combination Figure 1 and Figure 8, in an embodiment of the present application, in the first direction, the accommodation cavity 10a includes a first cavity wall 10a1 and a second cavity wall 10a2 that are relatively spaced apart. The liquid inlet hole 11a and the liquid outlet hole 11b are provided on the first cavity wall 10a1. Define the distance between the end of the filter element assembly 20 away from the first cavity wall 10a1 and the first cavity wall 10a1 as L3, and the distance between the end of the turbulence component 30 away from the first cavity wall 10a1 and the first cavity wall 10a1 as L4, satisfying the relationship: 0.3 ≤ L4 / L3 ≤ 0.6.

[0099] When the first direction is the up-down direction, the first cavity wall 10a1 and the second cavity wall 10a2 can be respectively the lower cavity wall and the upper cavity wall of the accommodation cavity 10a. Moreover, when the body 10 includes the base 11 and the cylinder 13 as introduced above, the upper surface of the base 11 can be formed as the first cavity wall 10a1, and the inner surface of the cylinder 13 corresponding to the upper surface of the base 11 can be formed as the second cavity wall 10a2. At this time, the liquid inlet hole 11a and the liquid outlet hole 11b can be provided on the base 11 of the body 10. L3 can refer to the distance between the upper surface of the filter element assembly 20 and the upper surface of the base 11, and L4 can refer to the distance between the upper surface of the turbulence component 30 and the upper surface of the base 11.

[0100] In this embodiment, setting the ratio of L4 to L3 to be 0.3 to 0.6 can prevent the extension dimension of the turbulence component 30 in the first direction from being too small, resulting in a limited lifting height of the particles and affecting the utilization rate of the upper part of the filter element assembly 20. At the same time, it can also prevent the extension dimension of the turbulence component 30 in the first direction from being too large, resulting in too high a lifting height of the particles, causing the particles to be located between the second cavity wall 10a2 and the upper end of the filter element assembly 20 and unable to be effectively filtered. Therefore, setting the ratio range of L4 to L3 in this way can better balance the utilization rate of the upper part of the filter element assembly 20 and the filtering effect of the particles. Among them, the ratio of L4 to L3 can be 0.3, 0.4, 0.5 or 0.6. Of course, it can also be any value within the above range.

[0101] Please refer to Figure 1 And FIG. 2, in an embodiment of the present application, the number of the liquid inlet holes 11a is two, and they are located on the opposite sides in the second direction of the liquid outlet hole 11b. The second direction intersects the first direction. The number of the turbulence components 30 is two, and each turbulence component 30 is arranged corresponding to one liquid inlet hole 11a.

[0102] In this embodiment, the number of the turbulence components 30 is set to two, and they are located on the opposite sides of the filter element assembly 20 in the second direction, so that turbulence can be formed by the two turbulence components 30 to disturb the liquids on the opposite sides of the filter element assembly 20. At the same time, the number of the turbulence components 30 is not too large, so that the formed turbulence will not overly disturb the liquid in the accommodation cavity 10a, resulting in the particulate impurities fluctuating repeatedly and being unable to enter the filter element assembly 20 for effective filtration.

[0103] Please refer to Figures 1 to 3 In an embodiment of the present application, a first convex portion 311 is provided around the side circumferential surface of the liquid flow channel 30a of the turbulence component 30.

[0104] The first convex portion 311 can be a seat structure, a block structure, a plate structure or a column structure. The present application does not limit the shape of the first convex portion 311. In addition, the number of the first convex portions 311 can be one, and of course, it can also be two or more. Moreover, when the number of the first convex portions 311 is at least two, at least two first convex portions 311 can be only arranged around the turbulence component 30. Of course, when defining that at least two first convex portions 311 arranged only around the turbulence component 30 are a group, the turbulence component 30 can also be provided with at least two groups of first convex portions 311 along the extension direction of the liquid flow channel 30a.

[0105] In this embodiment, by providing the first convex portion 311, the liquid flowing through the first convex portion 311 can form auxiliary turbulence to further improve the lifting effect of the particles mixed in the liquid.

[0106] Please refer to Figure 4 and Figure 5 In an embodiment of the present application, on the opposite sides of the first convex portion 311 in the extension direction of the liquid flow channel 30a, a first guiding surface 3111 and a second guiding surface 3113 are respectively provided; in the direction from the end of the first convex portion 311 far from the turbulence component 30 to the end close to the turbulence component 30, the distance between the first guiding surface 3111 and the second guiding surface 3113 is set to decrease.

[0107] When the first direction is the up and down direction, the lower surface of the first convex portion 311 can form the first guiding surface 3111, and the upper surface can form the second guiding surface 3113. In addition, the first guiding surface 3111 can be an inclined surface, and of course, it can also be an arc surface. Similarly, the second guiding surface 3113 can be an inclined surface, and of course, it can also be an arc surface.

[0108] In this embodiment, the two sides of the first convex portion 311 in the extending direction of the liquid flow channel 30a are respectively set as a first guiding surface 3111 and a second guiding surface 3113, so that the liquid can be guided by the first guiding surface 3111 and the second guiding surface 3113, which is beneficial to improving the smoothness of the liquid flow.

[0109] Please refer to Figure 3 , in an embodiment of the present application, the number of the first convex portions 311 is at least two and they are arranged around the turbulence component 30.

[0110] In this embodiment, the number of the first convex portions 311 is set to be at least two and they are arranged around the turbulence component 30, which is convenient for forming auxiliary turbulence in the circumferential direction of the turbulence component 30 and improving the lifting effect of the particles mixed in the liquid.

[0111] Please refer to Figures 3 to 5 , in an embodiment of the present application, the first convex portion 311 can be arranged at the middle position of the turbulence component 30, so that the high-frequency turbulence formed by the liquid flowing through the liquid flow channel 30a can lift the particle impurities above the turbulence component 30 after flowing out of the turbulence component 30, and the auxiliary turbulence formed by flowing through the first convex portion 311 can lift the particle impurities corresponding to the turbulence component 30 in the horizontal direction, realizing that the high-frequency turbulence and the auxiliary turbulence can lift the particle impurities in different regions, thereby improving the utilization effect of the high-frequency turbulence and the auxiliary turbulence.

[0112] Please refer to Figure 1 and Figure 6 , in an embodiment of the present application, the liquid outlet channel 25a of the filter element assembly 20 is communicated with the liquid outlet hole 11b, and the filter element assembly 20 is provided with a second convex portion 2111 around the side peripheral surface of the liquid outlet channel 25a.

[0113] The second convex portion 2111 can be a seat structure, a block structure, a plate structure or a column structure. The present application does not limit the shape of the second convex portion 2111. In addition, the number of the second convex portions 2111 can be one, and of course it can also be two or more. Moreover, when the number of the second convex portions 2111 is at least two, at least two second convex portions 2111 can be arranged only around the filter element assembly 20. Of course, when defining at least two second convex portions 2111 arranged only around the turbulence component 30 as a group, the filter element assembly 20 can also be provided with at least two groups of second convex portions 2111 along the extending direction of the liquid outlet channel 25a. In addition, the second convex portion 2111 can be arranged on the outer shell 21 of the filter element assembly 20.

[0114] In this embodiment, a second convex portion 2111 is provided on the outer shell 21 of the filter element assembly 20, so that a mechanical interception barrier can be provided for particulate impurities through the second convex portion 2111, and a part of the particles can be mechanically intercepted on the second convex portion 2111 first. At this time, the second convex portion 2111 outside the filter element assembly 20 and the filter element 23 inside the filter element assembly 20 can form a double protection to improve the filtering effect on particulate impurities.

[0115] Please refer to Figure 1 , in an embodiment of the present application, the turbulent flow assembly 30 and the filter element assembly 20 are both arranged to extend along the first direction, and are arranged side by side and spaced apart in a second direction intersecting the first direction; the distance between one end of the filter element assembly 20 away from the liquid outlet hole 11b and the second convex portion 2111 is less than the distance between one end of the filter element assembly 20 away from the liquid outlet hole 11b and one end of the turbulent flow assembly 30 away from the liquid inlet hole 11a.

[0116] When the first direction is the up-down direction, it can also be said that the height position of the second convex portion 2111 outside the filter element assembly 20 is higher than that of the turbulent flow assembly 30.

[0117] In this embodiment, the second convex portion 2111 is set to be higher than the turbulent flow assembly 30 so that it can be staggered from the turbulent flow assembly 30, which is beneficial to improving the compactness of the distribution between the turbulent flow assembly 30 and the filter element assembly 20. After the turbulence formed by the turbulent flow assembly 30 raises the particles, it is convenient for the particles to enter the upper part of the filter element assembly 20, and then effective filtration is achieved. At the same time, the compact distribution between the turbulent flow assembly 30 and the filter element assembly 20 can also reduce the excessive occupation of the space in the accommodation cavity 10a.

[0118] Please refer to in combination Figure 1 and Figure 6 , in an embodiment of the present application, the second convex portion 2111 is provided with a third guiding surface 2113, and the third guiding surface 2113 is arranged toward one end of the filter element assembly 20 close to the liquid outlet hole 11b; in the direction from one end of the filter element assembly 20 close to the liquid outlet hole 11b to the end far from the liquid outlet hole 11b, the distance between the third guiding surface 2113 and one end of the filter element assembly 20 close to the liquid outlet hole 11b is set to increase.

[0119] When the first direction is the up-down direction, the lower surface of the second convex portion 2111 can form the third guiding surface 2113. Among them, the third guiding surface 2113 can be an inclined surface, and of course it can also be an arc surface.

[0120] In this embodiment, the lower surface of the second convex portion 2111 is set as the third guiding surface 2113, so that when the liquid flows upward after entering the accommodation cavity 10a, the third guiding surface 2113 can play a guiding role for the liquid, which is beneficial to improving the smoothness of the liquid flow.

[0121] Please refer to Figure 6 , in an embodiment of the present application, the number of the second convex portions 2111 is at least two and they are arranged around the filter element assembly 20.

[0122] In this embodiment, the number of the second convex portions 2111 is set to be at least two and they are arranged around the filter element assembly 20, so that the particulate impurities can be intercepted by the second convex portions 2111 in the circumferential direction of the filter element assembly 20, and further improve the filtering effect on the particulate impurities.

[0123] Please refer to Figure 6 , in an embodiment of the present application, in order to take into account the interception of particulate impurities by the second convex portions 2111 and the effective entry of liquid into the filter element assembly 20 for filtration. When defining that at least two second convex portions 2111 are only arranged around the turbulent flow assembly 30 as a group, the filter element assembly 20 can be provided with two groups of second convex portions 2111 along the extension direction of the liquid outlet channel 25a.

[0124] Please refer to in combination Figure 1 、 Figure 2 and Figures 6 to 8 , in an embodiment of the present application, the machine body 10 is provided with a first jack 11c, one end of the first jack 11c is communicated with the accommodation cavity 10a, and the other end is communicated with the liquid outlet hole 11b; the housing 21 of the filter element assembly 20 may include a first main body 211 and a first insertion post 213 protruding from one end of the first main body 211, and the first insertion post 213 may be inserted into the first jack 11c.

[0125] When the machine body 10 includes the base 11 and the cylinder 13 as introduced above, the first jack 11c may be arranged on the base 11. Among them, the shape of the first jack 11c may be adapted to the shape of the first insertion post 213, for example: both are arranged as circular. In addition, the first insertion post 213 and the first jack 11c may be in threaded connection, and of course, they may also be in interference fit connection.

[0126] In this embodiment, the filter element assembly 20 and the machine body 10 are arranged to be inserted and matched through the first insertion post 213 and the first jack 11c, which can make the installation of the filter element assembly 20 and the machine body 10 relatively simple, and at the same time can increase the contact area between the two to improve the connection stability.

[0127] Please refer to Figure 2 and Figure 6 , in an embodiment of the present application, a first sealing ring 40 may be arranged between the first insertion post 213 and the inner wall of the first jack 11c to seal the connection between the filter element assembly 20 and the machine body 10.

[0128] Please refer to in combination Figure 1, Figure 2 and Figures 3 to 5 , in an embodiment of the present application, the body 10 is provided with a second jack 11d. One end of the second jack 11d communicates with the accommodating cavity 10a, and the other end communicates with the liquid inlet hole 11a; the turbulence component 30 may include a second main body 31 and a second plug 33 protruding from one end of the second main body 31. The second plug 33 may be inserted into the second jack 11d; a part of the liquid passing channel 30a is arranged in the second plug 33, and the other part is arranged in the second main body 31.

[0129] When the body 10 includes the base 11 and the cylinder 13 as introduced above, the second jack 11d may be arranged on the base 11. Wherein, the shape of the second jack 11d may be adapted to the shape of the second plug 33. For example, both of them are arranged to be circular. In addition, the second plug 33 and the second jack 11d may be in threaded connection, or may be in interference fit connection.

[0130] In this embodiment, arranging the turbulence component 30 and the body 10 to be inserted and matched through the second plug 33 and the second jack 11d can make the installation of the turbulence component 30 and the body 10 relatively simple, and at the same time can increase the contact area between the two to improve the connection stability.

[0131] Please refer to Figure 2 and Figure 5 , in an embodiment of the present application, a second sealing ring 50 may be arranged between the second plug 33 and the pore wall of the second jack 11d to seal the connection between the turbulence component 30 and the body 10.

[0132] Please refer to Figure 1 and Figure 2 In an embodiment of the present application, the filtering device 100 may further include a liquid inlet pipe 60 and a liquid outlet pipe 70. The liquid inlet pipe 60 communicates with the liquid inlet hole 11a, and the liquid outlet pipe 70 communicates with the liquid outlet hole 11b to facilitate connection positions through the liquid inlet pipe 60 and the liquid outlet pipe 70 for connection with external pipelines.

[0133] Please refer to Figures 1 to 8, in an embodiment of the present application, the filtering device 100 includes a body 10, a filter element assembly 20, and a turbulence assembly 30. The body 10 is provided with a receiving cavity 10a, a liquid inlet hole 11a, and a liquid outlet hole 11b. The liquid inlet hole 11a and the liquid outlet hole 11b communicate with the receiving cavity 10a; the filter element assembly 20 is disposed in the receiving cavity 10a and communicates with the liquid outlet hole 11b; the turbulence assembly 30 is disposed in the receiving cavity 10a. The turbulence assembly 30 is provided with a liquid passing channel 30a. The liquid passing channel 30a has a channel inlet 30a1 and a channel outlet 30a2. The channel inlet 30a1 communicates with the liquid inlet hole 11a, and the channel outlet 30a2 communicates with the receiving cavity 10a. The liquid passing channel 30a includes an expansion section 30a3 and a contraction section 30a4. The cross-sectional area of the expansion section 30a3 is larger than that of the contraction section 30a4. The contraction section 30a4 has the channel outlet 30a2. The number of both the expansion section 30a3 and the contraction section 30a4 is at least two, and they are arranged alternately. Among the at least two contraction sections 30a4, the contraction section 30a4 having the channel outlet 30a2 is defined as the terminal contraction section 30a41; among the at least two expansion sections 30a3, the expansion section 30a3 communicating with the terminal contraction section 30a41 is defined as the terminal expansion section 30a31, and the rest are the front expansion sections 30a34. The maximum cross-sectional area of the terminal expansion section 30a31 is larger than that of the front expansion section 30a34. Define the maximum cross-sectional area of the front expansion section 30a34 as S1, and the maximum cross-sectional area of the terminal expansion section 30a31 as S2, satisfying the relationship: 1.1 ≤ S2 / S1 ≤ 1.5. In the extending direction of the liquid passing channel 30a, the cross-sectional areas at both ends of the front expansion section 30a34 are smaller than the cross-sectional area in the middle, and / or, the cross-sectional areas at both ends of the terminal expansion section 30a31 are smaller than the cross-sectional area in the middle. When the cross-sectional areas at both ends of the front expansion section 30a34 are smaller than the cross-sectional area in the middle, the front expansion section 30a34 includes two first conical ring walls 30a35, and the larger cross-sectional area ends of one first conical ring wall 30a35 are connected to the larger cross-sectional area ends of the other first conical ring wall 30a35; when the cross-sectional areas at both ends of the terminal expansion section 30a31 are smaller than the cross-sectional area in the middle, the terminal expansion section 30a31 includes a spherical ring wall 30a32 and a second conical ring wall 30a33. The second conical ring wall 30a33 is located inside the spherical ring wall 30a32, and the larger cross-sectional area end of the second conical ring wall 30a33 is connected to the end of the spherical ring wall 30a32 close to the channel outlet 30a2. Among the at least two contraction sections 30a4, the other contraction sections 30a4 except the terminal contraction section 30a41 are defined as the front contraction sections 30a43. The maximum cross-sectional area of the terminal contraction section 30a41 is smaller than that of the front contraction section 30a43. Define the maximum cross-sectional area of the front contraction section 30a43 as S3, and the maximum cross-sectional area of the terminal contraction section 30a41 as S4, satisfying the relationship: 0.1 ≤ S4 / S3 ≤ 0.9.Define the maximum cross-sectional area of the front contraction section 30a43 as S3, and the maximum cross-sectional area of the front expansion section 30a34 as S1, satisfying the relationship: 1.1 ≤ S1 / S3 ≤ 1.8. In the extending direction of the liquid flow channel 30a, the extending dimension of the contraction section 30a4 is greater than that of the expansion section 30a3. In the extending direction of the liquid flow channel 30a, define the extending dimension of the contraction section 30a4 as L1, and the extending dimension of the expansion section 30a3 as L2, satisfying the relationship: 0.6 ≤ L2 / L1 ≤ 0.8. In the same contraction section 30a4, in the extending direction of the liquid flow channel 30a, the cross-sectional areas at all positions of the contraction section 30a4 are equal; in the cross-section perpendicular to the extending direction of the liquid flow channel 30a, the cross-section of the liquid flow channel 30a is circular. The liquid flow channel 30a further includes a buffer section 30a5, and the buffer section 30a5 has a flow channel inlet 30a1; the maximum cross-sectional area of the buffer section 30a5 is greater than that of the expansion section 30a3, and the minimum cross-sectional area of the buffer section 30a5 is greater than that of the contraction section 30a4. The numbers of the expansion section 30a3 and the contraction section 30a4 are both at least two, and they are arranged alternately, and one end of the buffer section 30a5 far from the flow channel inlet 30a1 is communicated with a contraction section 30a4. The buffer section 30a5 includes at least two sub-cavities 30a51 connected in sequence, and in the direction from the flow channel inlet 30a1 to the flow channel outlet 30a2, the maximum cross-sectional areas of the at least two sub-cavities 30a51 are arranged to decrease. The buffer section 30a5 includes three sub-cavities 30a51, and define the three sub-cavities 30a51 as the first sub-cavity 30a52, the second sub-cavity 30a53, and the third sub-cavity 30a54 respectively; the first sub-cavity 30a52 and the third sub-cavity 30a54 are cylindrical cavities, and the second sub-cavity 30a53 is a spherical cavity. The liquid inlet hole 11a and the liquid outlet hole 11b are located at the same end of the body 10. The turbulent flow component 30 and the filter element component 20 are both arranged to extend along the first direction, and the liquid flow channel 30a extends along the extending direction of the turbulent flow component 30. In the first direction, the accommodating cavity 10a includes a first cavity wall 10a1 and a second cavity wall 10a2 arranged at intervals relatively, and the liquid inlet hole 11a and the liquid outlet hole 11b are arranged on the first cavity wall 10a1; define the distance between the end of the filter element component 20 far from the first cavity wall 10a1 and the first cavity wall 10a1 as L3, and the distance between the end of the turbulent flow component 30 far from the first cavity wall 10a1 and the first cavity wall 10a1 as L4, satisfying the relationship: 0.3 ≤ L4 / L3 ≤ 0.6. The number of the liquid inlet holes 11a is two, and they are located on the relative two sides in the second direction of the liquid outlet hole 11b, and the second direction intersects with the first direction; the number of the turbulent flow components 30 is two, and each turbulent flow component 30 is arranged corresponding to a liquid inlet hole 11a. The turbulent flow component 30 is provided with a first convex portion 311 around the side peripheral surface of the liquid flow channel 30a.In the extending direction of the liquid passing flow channel 30a, a first guiding surface 3111 and a second guiding surface 3113 are respectively arranged on opposite sides of the first convex portion 311; in the direction from the end of the first convex portion 311 away from the turbulence component 30 to the end close to the turbulence component 30, the distance between the first guiding surface 3111 and the second guiding surface 3113 is set to decrease; the number of the first convex portions 311 is at least two and they are arranged around the turbulence component 30. The filter element assembly 20 is provided with a liquid outlet channel 25a, the liquid outlet channel 25a is communicated with the liquid outlet hole 11b, and a second convex portion 2111 is arranged on the circumferential surface of the filter element assembly 20 around the liquid outlet channel 25a. Both the turbulence component 30 and the filter element assembly 20 are arranged to extend along the first direction and are arranged side by side at intervals in a second direction intersecting the first direction; the distance between the end of the filter element assembly 20 away from the liquid outlet hole 11b and the second convex portion 2111 is less than the distance between the end of the filter element assembly 20 away from the liquid outlet hole 11b and the end of the turbulence component 30 away from the liquid inlet hole 11a; the second convex portion 2111 is provided with a third guiding surface 2113, and the third guiding surface 2113 is arranged towards the end of the filter element assembly 20 close to the liquid outlet hole 11b; in the direction from the end of the filter element assembly 20 close to the liquid outlet hole 11b to the end away from the liquid outlet hole 11b, the distance between the third guiding surface 2113 and the end of the filter element assembly 20 close to the liquid outlet hole 11b is set to increase; the number of the second convex portions 2111 is at least two and they are arranged around the filter element assembly 20.

[0134] The present application also provides a liquid injection device, which includes a liquid injection machine and a filtering device 100. The specific structure of the filtering device 100 refers to the above embodiments. Since this liquid injection device adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated one by one here. Among them, the liquid injection machine can be provided with a liquid inlet, and the liquid outlet hole 11b of the filtering device 100 can be communicated with the liquid inlet to filter the electrolyte entering the liquid injection machine, and the liquid injection machine can be used to inject the electrolyte into the shell of the battery device. In this way, through the filtering effect of the filtering device 100 on the electrolyte, the possibility that the particulate impurities mixed in the electrolyte are injected into the battery device can be reduced, and the possibility that the diaphragm of the battery device is punctured by the particulate impurities to cause a short circuit can be reduced.

[0135] The above are only the preferred embodiments of the present application, and do not limit the patent scope of the present application accordingly. All equivalent structural transformations made under the inventive concept of the present application by using the content of the specification and drawings of the present application, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A filtering device, characterized in that, Comprising: A body provided with a receiving cavity, a liquid inlet hole and a liquid outlet hole, wherein the liquid inlet hole and the liquid outlet hole communicate with the receiving cavity; A filter element assembly disposed in the receiving cavity and communicating with the liquid outlet hole; and A turbulence assembly disposed in the receiving cavity, the turbulence assembly having a liquid flow channel with a channel inlet and a channel outlet, the channel inlet communicating with the liquid inlet hole, and the channel outlet communicating with the receiving cavity.

2. The filtering device according to claim 1, wherein The liquid flow channel includes a divergent section and a convergent section, the cross-sectional area of the divergent section being larger than that of the convergent section, and the convergent section having the channel outlet.

3. The filtering device according to claim 2, wherein, The number of the divergent section and the convergent section is at least two, and they are arranged alternately.

4. The filtering device according to claim 3, characterized in that, Among the at least two convergent sections, the convergent section having the channel outlet is defined as the terminal convergent section; Among the at least two divergent sections, the divergent section communicating with the terminal convergent section is defined as the terminal divergent section, and the rest are the front divergent sections, and the maximum cross-sectional area of the terminal divergent section is larger than that of the front divergent sections.

5. The filtering device according to claim 4, characterized in that, Define the maximum cross-sectional area of the front divergent section as S1, and the maximum cross-sectional area of the terminal divergent section as S2, satisfying the relationship: 1.1 ≤ S2 / S1 ≤ 1.

5.

6. The filtering device according to claim 4, wherein In the extending direction of the liquid flow channel, the cross-sectional areas at both ends of the front divergent section are smaller than the cross-sectional area in the middle, and / or the cross-sectional areas at both ends of the terminal divergent section are smaller than the cross-sectional area in the middle.

7. The filtering device according to claim 6, characterized in that, In the case where the cross-sectional areas at both ends of the front divergent section are smaller than the cross-sectional area in the middle, the front divergent section includes two first conical ring walls, and the larger cross-sectional area ends of one first conical ring wall are connected to the larger cross-sectional area ends of the other first conical ring wall; and / or, in the case where the cross-sectional areas at both ends of the terminal divergent section are smaller than the cross-sectional area in the middle, the terminal divergent section includes a spherical ring wall and a second conical ring wall, the second conical ring wall is located inside the spherical ring wall, and the larger cross-sectional area end of the second conical ring wall is connected to the end of the spherical ring wall close to the channel outlet.

8. The filtering device according to claim 4, wherein Among the at least two convergent sections, the other convergent sections except the terminal convergent section are defined as the front convergent sections, and the maximum cross-sectional area of the terminal convergent section is smaller than that of the front convergent sections.

9. The filtering device according to claim 8, characterized in that, Define the maximum cross-sectional area of the front convergent section as S3, and the maximum cross-sectional area of the terminal convergent section as S4, satisfying the relationship: 0.1 ≤ S4 / S3 ≤ 0.

9.

10. The filtering device according to claim 8, characterized in that, Define the maximum cross-sectional area of the front convergent section as S3, and the maximum cross-sectional area of the front divergent section as S1, satisfying the relationship: 1.1 ≤ S1 / S3 ≤ 1.

8.

11. The filtering device according to claim 2, characterized in that, In the extending direction of the liquid flow channel, the extending dimension of the convergent section is larger than that of the divergent section.

12. The filtering device according to claim 2, wherein In the extending direction of the liquid flow channel, define the extending dimension of the convergent section as L1, and the extending dimension of the divergent section as L2, satisfying the relationship: 0.6 ≤ L2 / L1 ≤ 0.

8.

13. The filtering device according to claim 2, characterized in that, In the same convergent section, in the extending direction of the liquid flow channel, the cross-sectional areas at each part of the convergent section are equal; And / or, in a cross-section perpendicular to the extending direction of the liquid passing channel, the cross-section of the liquid passing channel is circular.

14. The filtering device according to claim 2, wherein The liquid passing channel further includes a buffer section, and the buffer section has the channel inlet. The maximum cross-sectional area of the buffer section is larger than the maximum cross-sectional area of the expansion section, and the minimum cross-sectional area of the buffer section is larger than the maximum cross-sectional area of the contraction section.

15. The filtering device according to claim 14, characterized in that, The number of the expansion sections and the contraction sections is at least two, and they are arranged alternately. One end of the buffer section far from the channel inlet is communicated with one of the contraction sections.

16. The filtering device according to claim 14, wherein The buffer section includes at least two sub-cavities that are communicated in sequence. In the direction from the channel inlet to the channel outlet, the maximum cross-sectional areas of the at least two sub-cavities are arranged to decrease.

17. The filtering device according to claim 16, characterized in that, The buffer section includes three sub-cavities, and the three sub-cavities are defined as a first sub-cavity, a second sub-cavity, and a third sub-cavity respectively. The first sub-cavity and the third sub-cavity are cylindrical cavities, and the second sub-cavity is a spherical cavity.

18. The filtering device according to any one of claims 1 to 17, characterized in that, The liquid inlet hole and the liquid outlet hole are located at the same end of the body. The turbulent flow component and the filter element component both extend along the first direction, and the liquid passing channel extends along the extending direction of the turbulent flow component.

19. The filtering device according to claim 18, characterized in that, In the first direction, the accommodating cavity includes a first cavity wall and a second cavity wall that are relatively spaced apart. The liquid inlet hole and the liquid outlet hole are arranged on the first cavity wall. Define the distance between the end of the filter element component far from the first cavity wall and the first cavity wall as L3, and the distance between the end of the turbulent flow component far from the first cavity wall and the first cavity wall as L4, and they satisfy the relationship: 0.3 ≤ L4 / L3 ≤ 0.

6.

20. The filtering device according to claim 18, wherein, The number of the liquid inlet holes is two, and they are located on the opposite sides in the second direction of the liquid outlet hole. The second direction intersects with the first direction. The number of the turbulent flow components is two, and each turbulent flow component is arranged corresponding to one liquid inlet hole.

21. The filtering device according to any one of claims 1 to 17, characterized in that, The turbulent flow component is provided with a first convex portion around the side peripheral surface of the liquid passing channel.

22. The filtering device according to claim 21, characterized in that, In the extending direction of the liquid passing channel, a first guiding surface and a second guiding surface are respectively arranged on the opposite sides of the first convex portion; in the direction from the end of the first convex portion far from the turbulent flow component to the end close to the turbulent flow component, the distance between the first guiding surface and the second guiding surface is arranged to decrease. And / or, the number of the first convex portions is at least two, and they are arranged around the turbulent flow component.

23. The filtering device according to any one of claims 1 to 17, characterized in that, The filter element component is provided with a liquid outlet channel, and the liquid outlet channel is communicated with the liquid outlet hole. The filter element component is provided with a second convex portion around the side peripheral surface of the liquid outlet channel.

24. The filtering device according to claim 23, characterized in that, The turbulent flow component and the filter element component both extend along the first direction, and are arranged side by side and spaced apart in a second direction intersecting with the first direction; the distance between the end of the filter element component far from the liquid outlet hole and the second convex portion is less than the distance between the end of the filter element component far from the liquid outlet hole and the end of the turbulent flow component far from the liquid inlet hole. And / or, the second convex portion is provided with a third guiding surface, and the third guiding surface is arranged towards one end of the filter element assembly close to the liquid outlet hole; in the direction from one end of the filter element assembly close to the liquid outlet hole to the end far from the liquid outlet hole, the distance between the third guiding surface and one end of the filter element assembly close to the liquid outlet hole is set to increase; And / or, the number of the second convex portions is at least two and they are arranged around the filter element assembly.

25. A liquid injection device, characterized in that, Comprising the filtering device according to any one of claims 1 to 24.

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