Filtering device and liquid injection apparatus

Abstract

The application discloses a filtering device and a liquid injection equipment, comprising a body, a filter element assembly and a turbulent flow assembly. The body is provided with a containing cavity, a liquid inlet hole and a liquid outlet hole, the liquid inlet hole and the liquid outlet hole are communicated with the containing cavity; the filter element assembly is arranged in the containing cavity and communicated with the liquid outlet hole; the turbulent flow assembly is arranged in the containing cavity, the turbulent flow assembly 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 communicated with the liquid inlet hole, and the flow channel outlet is communicated with the containing cavity. The technical scheme of the application can reduce the possibility of deposition of particulate impurities during use of the filtering device, so that the particulate impurities are intercepted and filtered by the filter element assembly as much as possible, the escape of the particulate impurities 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 filter, in particular to a filter device and liquid injection equipment. BACKGROUND

[0002] In the related art, the filter device is used, and some particle impurities such as metal particles have relatively large density, so that the particle impurities are easily deposited at the bottom of the filter device, and cannot be effectively filtered by the filter core assembly in the filter device. SUMMARY

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

[0004] To achieve the above purpose, the filter device provided by the present application comprises:

[0005] A machine body is provided with a containing cavity, a liquid inlet hole and a liquid outlet hole, the liquid inlet hole and the liquid outlet hole are communicated with the containing cavity;

[0006] A filter core assembly is arranged in the containing cavity and communicated with the liquid outlet hole; and

[0007] A turbulent flow assembly is arranged in the containing cavity, and the turbulent flow assembly 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 communicated with the liquid inlet hole, and the flow channel outlet is communicated with the containing cavity.

[0008] In the technical scheme of the present application, the filter device is provided with the turbulent flow assembly in the containing cavity of the machine body, and the flow channel inlet of the liquid flow channel in the turbulent flow assembly is communicated with the liquid inlet hole. Therefore, after the liquid enters the filter from the liquid inlet hole, the liquid can enter the liquid flow channel of the turbulent flow assembly to be induced to form turbulent flow. At this time, the turbulent flow has high-frequency pressure and speed fluctuation, which can disturb the liquid in the containing cavity, so that the particles mixed in the liquid are lifted as much as possible, the possibility of particle impurities deposition is reduced, the particle impurities are intercepted and filtered by the filter core assembly as much as possible, the escape of the particle impurities is reduced, and the filtering efficiency of the filter device is improved.

[0009] In some embodiments, the liquid flow channel comprises an expansion section and a contraction section, the cross-sectional area of the expansion section is larger than that of the contraction section, and the contraction section has the flow channel outlet. In this way, the liquid flow channel can have a large cross-sectional size change at different section bodies, which can significantly change the flow rate and pressure distribution of the liquid flowing therethrough, so that the kinetic energy and potential energy of the liquid are continuously converted, and the rapid change of energy can cause the liquid molecules to move and collide with each other violently, thereby effectively forming the required turbulent flow. Finally, the contraction section forms the flow channel outlet, so that the liquid flowing out of the flow channel outlet can still have a large speed and pressure, so as to effectively disturb the liquid not filtered in the accommodation cavity, and improve the lifting effect of the particles mixed in the liquid.

[0010] In some embodiments, the number of expansion sections and contraction sections is at least two, and they are arranged alternately. In this way, the liquid flowing through the liquid flow channel can alternately pass through the expansion section and the contraction section, further improving the change effect of the flow rate and pressure distribution of the liquid flowing therethrough, so as to better induce the liquid to form turbulent flow.

[0011] In some embodiments, among the at least two contraction sections, the contraction section defining the flow channel outlet is defined as the terminal contraction section; among the at least two expansion sections, the expansion section communicating with the terminal contraction section is defined as the terminal expansion section, and the rest are front expansion sections, and the maximum cross-sectional area of the terminal expansion section is larger than that of the front expansion sections. In this way, the terminal expansion section can also play a buffering role for the entering liquid, while further increasing the cross-sectional size change of the terminal expansion section and the contraction section to enhance the turbulent flow intensity and flow rate of the liquid, thereby facilitating further improving the disturbance effect of the liquid not filtered in the accommodation cavity and enhancing the lifting effect of the particles mixed in the liquid.

[0012] In some embodiments, the maximum cross-sectional area of the front expansion section is defined as S1, the maximum cross-sectional area of the terminal expansion section is defined as S2, and the relationship 1.1≤S2 / S1≤1.5 is satisfied. In this way, the turbulent flow effect of the liquid flowing through the liquid flow channel can be improved.

[0013] In some embodiments, in the extension direction of the liquid flow channel, the cross-sectional area of the front expansion section at both ends is smaller than that in the middle, and / or the cross-sectional area of the end expansion section at both ends is smaller than that in the middle. In this way, by setting the cross-sectional area of the front expansion section at both ends to be relatively small and the cross-sectional area in the middle to be relatively large, the front expansion section can better guide the incoming liquid, and then converge and guide the liquid into the contraction section, thereby facilitating the smoothness of the liquid flow and improving the stability of the generated turbulent flow. By setting the cross-sectional area of the end expansion section at both ends to be relatively small and the cross-sectional area in the middle to be relatively large, the end expansion section can better guide the incoming liquid, and then converge and guide the liquid into the contraction section, thereby facilitating the smoothness of the liquid flow and improving the stability of the generated turbulent flow.

[0014] In some embodiments, in the case where the cross-sectional area of the front expansion section at both ends is smaller than that in the middle, the front expansion section comprises two first conical ring walls, and the larger end of the cross-sectional area of one first conical ring wall is connected to the larger end of the cross-sectional area of the other first conical ring wall; and / or in the case where the cross-sectional area of the end expansion section at both ends is smaller than that in the middle, the end expansion section comprises 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 end of the cross-sectional area of the second conical ring wall is connected to the end of the spherical ring wall close to the outlet of the flow channel. In this way, by comprising two opposite first conical ring walls, the front expansion section can improve the regularity of the front expansion section while meeting the requirement that the cross-sectional area of the front expansion section at both ends is smaller than that in the middle, thereby facilitating the convenience of processing and molding the front expansion section. By setting the end expansion section to comprise a spherical ring wall and a second conical ring wall, the end expansion section can facilitate the enlargement of the cross-sectional area of the end expansion section while meeting the requirement that the cross-sectional area of the end expansion section at both ends is smaller than that in the middle, so as to realize that the maximum cross-sectional area of the end expansion section is greater than that of the front expansion section. At the same time, the regularity of the end expansion section can also be improved, thereby facilitating the convenience of processing and molding the end expansion section.

[0015] In some embodiments, among the at least two contraction sections, the contraction sections other than the end contraction section are defined as front contraction sections, and the maximum cross-sectional area of the end contraction section is smaller than that of the front contraction section. In this way, 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 turbulent flow assembly, the disturbance intensity and range to the liquid in the accommodation cavity that has not been filtered can be enhanced, and the lifting effect of the particulate impurities mixed in the liquid can be enhanced.

[0016] 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, and the relationship 0.1≤S4 / S3≤0.9 is satisfied. In this way, the disturbance range and intensity of the turbulent flow formed by the turbulent flow assembly on the liquid in the accommodation cavity that is not filtered can be better balanced.

[0017] 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, and the relationship 1.1≤S1 / S3≤1.8 is satisfied. In this way, the turbulent flow effect of the liquid flowing through the liquid flow channel can be improved.

[0018] In some embodiments, in the same contraction section, the cross-sectional areas of the contraction section at different positions in the extension direction of the liquid flow channel are equal; and / or, in the cross section perpendicular to the extension direction of the liquid flow channel, the cross section of the liquid flow channel is circular. In this way, the cross-sectional areas of the contraction section at different positions are set to be equal, so that the contraction section at different positions can uniformly and effectively compress the liquid passing through, so that the liquid passing through the contraction section can form a fluid that meets the required flow rate and pressure, and promote the formation of turbulent flow. The cross section of the liquid flow channel is circular, which on the one hand can make the structure of the liquid flow channel more regular and simple, thereby facilitating the convenience of processing and molding. On the other hand, it can also reduce the resistance of the liquid flowing through the liquid flow channel, and improve the smoothness of the liquid flowing in the turbulent flow assembly.

[0019] In some embodiments, in the extension direction of the liquid flow channel, the extension size of the contraction section is greater than the extension size of the expansion section. In this way, it is beneficial to prolong the time of the liquid passing through the contraction section, so as to obtain sufficient contraction, enhance the speed and pressure of the liquid flowing through, so as to increase the speed change and pressure change of the liquid in the liquid flow channel, and promote the formation of turbulent flow.

[0020] In some embodiments, in the extension direction of the liquid flow channel, the extension size of the contraction section is defined as L1, and the extension size of the expansion section is defined as L2, and the relationship 0.6≤L2 / L1≤0.8 is satisfied. In this way, the extension size of the contraction section cannot be too short, which affects the contraction effect of the liquid flowing through. At the same time, the extension size of the contraction section cannot be too large, which affects the frequency of expansion and contraction of the liquid and affects the turbulent flow effect.

[0021] In some embodiments, the liquid flow channel further comprises 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. In this way, the buffer section can buffer the liquid, so as to have a sufficient amount of liquid to enter the subsequent expansion section and contraction section, and realize effective expansion and contraction of the liquid.

[0022] In some embodiments, the number of the expansion sections and the number of the contraction sections are both at least two, and the expansion sections and the contraction sections are arranged alternately, and the end of the buffer section away from the inlet of the flow channel is communicated with a contraction section. Thus, the liquid buffered can directly enter the contraction section for contraction, and the cross-sectional area of the buffer section and the contraction section changes greatly, thereby facilitating the contraction effect of the liquid and promoting the formation of turbulent flow.

[0023] In some embodiments, the buffer section includes at least two sub-cavities communicated in sequence, and the maximum cross-sectional area of the at least two sub-cavities is arranged to decrease in the direction from the inlet of the flow channel to the outlet of the flow channel. Thus, the buffer section can smoothly receive the liquid flowing from the liquid inlet hole with a relatively large cross-sectional area and guide the liquid to the contraction section with a relatively small cross-sectional area.

[0024] In some embodiments, 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; the first sub-cavity and the third sub-cavity are cylindrical cavities, and the second sub-cavity is a spherical cavity. Thus, the first sub-cavity and the third sub-cavity with cylindrical cavities at both ends can facilitate the connection of the buffer section with the liquid inlet hole and the contraction section. The second sub-cavity with a spherical cavity in the middle can guide the liquid effectively.

[0025] In some embodiments, the liquid inlet hole and the liquid outlet hole are located at the same end of the body, the turbulent flow assembly and the filter element assembly are arranged to extend in the first direction, and the liquid flow channel is arranged to extend in the extension direction of the turbulent flow assembly. Thus, after the liquid flowing through the liquid flow channel forms a turbulent flow and flows out through the flow channel outlet, the liquid can flow towards the end away from the liquid inlet hole and the liquid outlet hole, so as to direct the particles mixed in the liquid towards the end away from the liquid inlet hole and the liquid outlet hole, and realize that the particles flow into the end of the filter element assembly away from the liquid outlet hole along with the liquid and are intercepted.

[0026] In some embodiments, in the first direction, the accommodation cavity includes a first cavity wall and a second cavity wall arranged at a relative distance, and the liquid inlet hole and the liquid outlet hole are arranged on 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, the distance between the end of the turbulent flow assembly away from the first cavity wall and the first cavity wall is defined as L4, and the relationship 0.3≤L4 / L3≤0.6 is satisfied. Thus, the utilization rate of the upper part of the filter element assembly and the filtering effect of the particles can be better balanced.

[0027] In some embodiments, the number of liquid inlet holes is two, and the liquid inlet holes are located on opposite sides in a second direction of the liquid outlet hole, and the second direction intersects the first direction; and the number of turbulence components is two, and each turbulence component is arranged corresponding to one liquid inlet hole. In this way, the turbulence can be formed by the two turbulence components to disturb the liquid on the opposite sides of the filter element assembly. At the same time, the number of turbulence components is not too much, so that the turbulence formed does not cause excessive disturbance to the liquid in the accommodation cavity, so that the particulate impurities cannot enter the filter element assembly for effective filtration.

[0028] In some embodiments, the turbulence component is provided with a first protrusion around the side circumferential surface of the liquid passage. In this way, the liquid flowing through the first protrusion can form auxiliary turbulence to further improve the lifting effect of the particles mixed in the liquid.

[0029] In some embodiments, in the extension direction of the liquid passage, the opposite sides of the first protrusion are respectively provided with a first guide surface and a second guide surface; in the direction from the end of the first protrusion away from the turbulence component to the end close to the turbulence component, the distance between the first guide surface and the second guide surface decreases; and / or, the number of first protrusions is at least two, and the first protrusions are arranged around the turbulence component. In this way, the two sides of the first protrusion in the extension direction of the liquid passage are respectively provided with the first guide surface and the second guide surface, so that the first guide surface and the second guide surface can guide the liquid, thereby facilitating the smoothness of the liquid flow. The number of first protrusions is at least two, and the first protrusions are arranged around the turbulence component, which facilitates the formation of auxiliary turbulence in the circumferential direction of the turbulence component to improve the lifting effect of the particles mixed in the liquid.

[0030] In some embodiments, the filter element assembly is provided with a liquid outlet channel, the liquid outlet channel is in communication with the liquid outlet hole, and the filter element assembly is provided with a second protrusion around the side circumferential surface of the liquid outlet channel. In this way, the second protrusion can provide a mechanical interception barrier for the particulate impurities, so that a part of the particles are first mechanically intercepted on the second protrusion.

[0031] In some embodiments, the turbulence assembly and the filter element assembly are both arranged to extend along a first direction and are spaced side by side in a second direction intersecting the first direction; the distance between the end of the filter element assembly away from the liquid outlet and the second protrusion is less than the distance between the end of the filter element assembly away from the liquid outlet and the end of the turbulence assembly away from the liquid inlet; and / or the second protrusion is provided with a third guide surface, the third guide surface being arranged toward the end of the filter element assembly near the liquid outlet; the distance between the third guide surface and the end of the filter element assembly near the liquid outlet increases from the end of the filter element assembly near the liquid outlet to the end away from the liquid outlet; and / or the number of the second protrusions is at least two and is arranged around the filter element assembly. Thus, the second protrusion is arranged higher than the turbulence assembly so that it can be staggered with the turbulence assembly, thereby facilitating the compactness of the distribution between the turbulence assembly and the filter element assembly, so that the turbulence generated by the turbulence assembly, after lifting particles, facilitates the particles to enter the upper portion of the filter element assembly, thereby achieving effective filtration. At the same time, the compact arrangement between the turbulence component and the filter element component can also reduce the excessive space occupied within the accommodating chamber. The lower surface of the second protrusion is set as a third guide surface, so that when the liquid flows upward after entering the accommodating chamber, the third guide surface can guide the liquid, thereby facilitating smoother flow of the liquid. The number of second protrusions is set to at least two, and they are arranged around the filter element component, so that the second protrusions can intercept particulate impurities in the circumferential direction of the filter element component, further improving the filtering effect of particulate impurities.

[0032] The present application also provides a liquid injection device including the above-mentioned filtering device. Thus, the filtering device can filter the electrolyte to reduce the possibility of impurities mixed in the electrolyte being injected into the battery device. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0034] Figure 1 This is a schematic structural diagram of an embodiment of the filtering device of the present application;

[0035] Figure 2 for Figure 1 A cross-sectional schematic diagram of the filter device;

[0036] Figure 3 for Figure 1 Schematic diagram of the structure of the turbulent flow component of the filter device;

[0037] Figure 4 Fig. 1 is a perspective view of a filter device according to the present application; Figure 3 Fig. 2 is another perspective view of the filter device according to the present application;

[0038] Figure 5 Fig. 3 is a sectional view of the filter device according to the present application; Figure 4 Fig. 4 is a sectional view of the filter device according to the present application;

[0039] Figure 6 Fig. 5 is a sectional view of the filter device according to the present application; Figure 1 Fig. 6 is a sectional view of the filter device according to the present application;

[0040] Figure 7 Fig. 7 is a sectional view of the filter device according to the present application; Figure 6 Fig. 8 is a sectional view of the filter device according to the present application;

[0041] Figure 8 Fig. 9 is a sectional view of the filter device according to the present application; Figure 2 Fig. 10 is a sectional view of the filter device according to the present application;

[0042] BRIEF DESCRIPTION OF THE DRAWINGS

[0043] 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 insertion hole; 11d, second insertion hole; 13, cylinder; 20, filter core assembly; 21, shell; 211, first main body; 2111, second protrusion; 2113, first guide surface; 213, first insertion post; 23, filter core; 25, inner skeleton; 25a, liquid outlet passage; 30, turbulence assembly; 30a, liquid passage; 30a1, passage inlet; 30a2, passage 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 protrusion; 3111, second guide surface; 3113, first guide surface; 33, second insertion post; 40, first sealing ring; 50, second sealing ring; 60, liquid inlet pipe; 70, liquid outlet pipe.

[0044] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0045] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0046] It should be noted that all the direction indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the direction indications will also change accordingly.

[0047] In the present application, unless specifically defined and limited otherwise, the terms "connection", "fixation", etc. should be understood in a broad sense, for example, "fixation" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium; can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For a person of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0048] In addition, the description involving "first", "second", etc. in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text is to include three parallel solutions, for example, "A and / or B" includes A solution, or B solution, or A and B solutions at the same time. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person of ordinary skill in the art can realize it, and when the combination of technical solutions contradicts each other or cannot be realized, it should be considered that the combination of technical solutions does not exist, and is not within the scope of protection claimed by the present application.

[0049] The filtering device, that is, the device that can be used to intercept the particulate impurities mixed in the liquid flowing through it to obtain a relatively clean liquid. It is not only applied in daily life, such as filtering drinking water; but also applied in industrial production, such as filtering the electrolyte in the battery production process.

[0050] However, in the related art, some particulate impurities such as metal particles have relatively large density, which makes them easy to deposit at the bottom of the filtering device, so that they cannot be effectively filtered by the filter core assembly in the filtering device.

[0051] Therefore, based on the above considerations, in order to solve the problem that the filtering device in the related art is affected by the deposition of particulate impurities, a new filtering device is proposed. The filtering device innovatively sets a turbulent component in communication with the liquid inlet hole in the accommodation cavity, so that the liquid entering from the liquid inlet hole can form a turbulent flow after passing through the turbulent component, so as to have high-frequency pressure and speed fluctuations, which can disturb the liquid in the accommodation cavity and lift the particles as much as possible. The possibility of deposition of particulate impurities is reduced, and the particulate impurities can be intercepted and filtered by the filter element assembly in the accommodation cavity as much as possible.

[0052] In addition, it should be noted that the filtering device proposed in the present application can be used not only for filtering electrolyte as described above, but also for filtering deionized water, or for filtering N-methyl pyrrolidone, etc. It can be seen that the application scenario of the filtering device proposed in the present application is not limited.

[0053] Next, the structure of the filtering device proposed in the present application will be explained and described in the embodiments:

[0054] Please refer to Figures 1 to 4 In an embodiment of the present application, the filtering device 100 proposed in the present application includes a body 10, a filter element assembly 20 and a turbulent component 30. The body 10 is provided with an accommodation cavity 10a, a liquid inlet hole 11a and a liquid outlet hole 11b. The liquid inlet hole 11a and the liquid outlet hole 11b are in communication with the accommodation cavity 10a. The filter element assembly 20 is arranged in the accommodation cavity 10a and is in communication with the liquid outlet hole 11b. The turbulent component 30 is arranged in the accommodation cavity 10a. The turbulent component 30 is provided with a liquid flow channel 30a. The liquid flow channel 30a has a flow channel inlet 30a1 and a flow channel outlet 30a2. The flow channel inlet 30a1 is in communication with the liquid inlet hole 11a, and the flow channel outlet 30a2 is in communication with the accommodation cavity 10a.

[0055] The body 10 can be used to form a receiving cavity 10a to accommodate components such as the filter element assembly 20 and the turbulence assembly 30, so that the components in the filter device 100 can be assembled to form a whole for use. Meanwhile, the body 10 can also be used to form an inlet hole 11a and an outlet hole 11b, so that the liquid to be filtered can enter through the inlet hole 11a, and the filtered liquid can flow out through the outlet hole 11b. The body 10 can extend in a first direction, and the projection of the body 10 on a projection plane perpendicular to the first direction can be circular, of course, it can also be square or rectangular, and the shape of the body 10 is not limited in the application. In addition, in the first direction, the body 10 can include a base 11 and a cylinder 13 with an open end, and the receiving cavity 10a is formed by the two. Of course, the body 10 can also include at least two split parts in a second direction intersecting the first direction, and the receiving cavity 10a is formed by the at least two split parts. It can be seen that the structure type of the body 10 is not limited in the application. It should be noted that in the normal installation and use state of the filter device 100, the first direction can be the vertical direction, of course, it can also be the horizontal direction, and the specific type of the first direction is not limited in the application. 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 on the first direction is circular, the projection of the receiving cavity 10a on the first direction can also be circular, so that the volume of the receiving cavity 10a can be increased as much as possible under the limited volume of the body 10. Of course, the shape of the receiving cavity 10a and the shape of the body 10 can be different. In addition, the shape of the inlet hole 11a can be circular, of course, it can also be square or rectangular, and the shape of the inlet hole 11a is not limited in the application. The number of inlet holes 11a can be one, of course, it can also be two or more, and the number of inlet holes 11a is not limited in the application. Similarly, the shape of the outlet hole 11b can be circular, of course, it can also be square or rectangular, and the shape of the outlet hole 11b is not limited in the application. The number of outlet holes 11b can be one, of course, it can also be two or more, and the number of outlet holes 11b is not limited in the application. In addition, the inlet hole 11a and the outlet hole 11b can be arranged on the same surface of the body 10, of course, they can also be arranged on adjacent surfaces of the body 10, and the relative position relationship between the inlet hole 11a and the outlet hole 11b is not limited in the application. In order to facilitate the shape of the inlet hole 11a and the outlet hole 11b, and the installation of the external pipeline with the inlet hole 11a and the outlet hole 11b, the inlet hole 11a and the outlet hole 11b can be arranged on the same end of the body 10 in an embodiment.

[0056] The filter element assembly 20 can be used to filter the particulate impurities mixed in the liquid flowing therethrough. 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 the inner side thereof. The inner skeleton 25 can be arranged in the housing 21 and enclose a liquid outlet channel 25a, which can communicate with the liquid outlet hole 11b on the body 10. The filter element 23 can surround the outer side of the inner skeleton 25. Therefore, the unfiltered liquid in the accommodating cavity 10a of the 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 pass through the filter element 23 between the housing 21 and the inner skeleton 25 to filter the particulate impurities mixed in the liquid. The filtered liquid can then enter the liquid outlet channel 25a enclosed by the inner skeleton 25 and then flow out from the liquid outlet hole 11b on the body 10. The inner skeleton 25 can be a cylindrical structure and provided with mesh holes for the liquid to enter the liquid outlet channel 25a. Of course, the inner skeleton 25 can also be a ring-shaped grid structure. The present application does not limit the structure type of the inner skeleton 25, as long as the liquid can enter the liquid outlet channel 25a enclosed by the inner skeleton 25 after being filtered by the filter element 23. In some embodiments, the liquid outlet channel 25a can be enclosed by the filter element 23 and the inner skeleton 25 together. In addition, the filter element assembly 20 can extend along the extension direction of the body 10, for example, extend along the first direction with the body 10 to fully utilize the space of the accommodating cavity 10a of the body 10. Of course, the extension direction of the filter element assembly 20 can also be at an angle to the extension direction of the body 10, for example, form an angle of 10°, 15°, or 20°. In addition, the filter element assembly 20 can be directly connected to the body 10, or indirectly mounted to the body 10 through an intermediate carrier. Moreover, the filter element assembly 20 can be detachably mounted to the body 10 to be replaced after being used for a period of time. The detachable connection can be any connection mode such as threaded connection, buckle connection, or interference fit. In addition, the number of filter element assemblies 20 can be one, or two or more.

[0057] The turbulence component 30 can be used to induce the liquid flowing through the liquid flow channel 30a to form a turbulent flow, so as to lift the particulate impurities mixed in the unfiltered liquid in the accommodating cavity 10a, and make the particulate impurities follow the liquid into the filter element assembly 20 as much as possible to be intercepted and filtered by the filter element assembly 20. The turbulence component 30 can be configured to include an expansion section 30a3 and a contraction section 30a4, so as to induce the liquid flowing through the liquid flow channel 30a to form a turbulent flow. Of course, the liquid flow channel 30a of the turbulence component 30 can also be configured to include at least two sections with different roughness, so as to induce the liquid flowing through the liquid flow channel 30a to form a turbulent flow. Alternatively, the liquid flow channel 30a can be configured to extend in a spiral shape, so as to induce the liquid flowing through the liquid flow channel 30a to form a turbulent flow. It can be seen that the structure of the liquid flow channel 30a of the turbulence component 30 is not limited in the present application. In addition, the cross section of the liquid flow channel 30a can be circular, of course, it can also be square or rectangular in the cross section perpendicular to the extension direction of the liquid flow channel 30a. In addition, the extension direction of the liquid flow channel 30a can be consistent with the extension direction of the turbulence component 30, of course, it can also 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, of course, it can also be provided with two or more liquid flow channels 30a. In addition, the turbulence component 30 can be linear, of course, it can also be configured to include at least two sections arranged at an angle, or be a spiral structure. In addition, the number of the turbulence component 30 can be one, of course, it can also be two or more. In order to induce the liquid flowing into each liquid inlet hole 11a to form a turbulent flow, the number of the turbulence component 30 can be corresponding to the number of the liquid inlet hole 11a. Of course, only part of the liquid inlet hole 11a can be provided with the turbulence component 30. In addition, the turbulence component 30 can be directly connected to the body 10, of course, it can also be indirectly mounted to the body 10 through an intermediate carrier. Moreover, the turbulence component 30 can be detachably mounted to the body 10, so as to be cleaned after being used for a period of time. The detachable connection can be any connection mode such as threaded connection, buckle connection or interference fit connection.

[0058] The filtering device 100 in the technical scheme of the present application is provided with a turbulence component 30 in the accommodating cavity 10a of the machine body 10, and the flow channel inlet 30a1 of the liquid passing flow channel 30a in the turbulence component 30 is communicated with the liquid inlet hole 11a. Therefore, after the liquid enters into the filter from the liquid inlet hole 11a, the liquid can enter into the liquid passing flow channel 30a of the turbulence component 30 to be induced to form turbulence. At this time, the turbulence has high frequency pressure and speed fluctuation, can disturb the liquid in the accommodating cavity 10a, make the particles mixed in the liquid as possible to be lifted up, reduce the possibility of the particle impurities to be deposited, make the particle impurities as possible to be intercepted and filtered by the filter element assembly 20, reduce the particle impurities to escape, and improve the filtering efficiency of the filtering device 100.

[0059] Please refer to Figures 3 to 5 In an embodiment of the present application, the liquid passing flow channel 30a comprises an expansion section 30a3 and a contraction section 30a4, the cross-sectional area of the expansion section 30a3 is greater than that of the contraction section 30a4, and the contraction section 30a4 has the flow channel outlet 30a2.

[0060] The expansion section 30a3 and the contraction section 30a4, i.e., in the cross section perpendicular to the extension direction of the liquid flow channel 30a, or in the cross section parallel to the extension direction of the liquid flow channel 30a, the cross-sectional area of the expansion section 30a3 is larger than that of the contraction section 30a4. Among them, in the liquid flow 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 turbulence component 30, it can also be said that in the direction from the flow channel inlet 30a1 to the flow channel outlet 30a2, the cross-sectional area of the expansion section 30a3 can be set to vary, of course, it can also be set to be equal; similarly, the cross-sectional area of the contraction section 30a4 can be set to vary, of course, it can also be set to be equal. Moreover, in the projection plane perpendicular to the liquid flow direction of the liquid flow channel 30a, the projection of the expansion section 30a3 can be circular, square or rectangular, etc., and the projection of the contraction section 30a4 can also be circular, square or rectangular, etc. It can be seen that the shape of the expansion section 30a3 and the shape of the contraction section 30a4 are not limited in the present application. Among them, when the cross-sectional area of the expansion section 30a3 is set to vary and the cross-sectional area of the contraction section 30a4 is also set to vary, the minimum cross-sectional area of the expansion section 30a3 can be greater than the maximum cross-sectional area of the contraction section 30a4. In addition, the number of expansion sections 30a3 can be one, of course, it can also be two or more. Similarly, the number of contraction sections 30a4 can be one, of course, it can also be two or more. Moreover, the number of expansion sections 30a3 and the number of contraction sections 30a4 can be set to be the same, of course, they can also be set to be different. In addition, the flow channel inlet 30a1 can be directly provided on the expansion section 30a3, of course, it can also be provided on the buffer section 30a5 in the liquid flow channel 30a as described below, or when the number of contraction sections 30a4 is at least two, the flow channel inlet 30a1 is provided on the contraction section 30a4.

[0061] In the present embodiment, the liquid flow channel 30a is provided with the expansion section 30a3 and the contraction section 30a4, which can make the liquid flow channel 30a have a large cross-sectional size change at different sections, i.e., at the expansion section 30a3 and the contraction section 30a4, so that the flow rate and pressure distribution of the liquid flowing through can be significantly changed, the kinetic energy and potential energy of the liquid are continuously converted, and the rapid change of energy can cause the liquid molecules to move and collide with each other, thereby effectively forming the required turbulence. Moreover, the flow channel outlet 30a2 is finally formed by the contraction section 30a4, which can also make the liquid flowing out of the flow channel outlet 30a2 still have a large speed and pressure, so as to strongly disturb the liquid not filtered in the accommodation cavity 10a, thereby improving the lifting effect of the particles mixed in the liquid.

[0062] Please refer to Figures 3 to 5In an embodiment of the present application, the number of the expansion sections 30a3 and the number of the contraction sections 30a4 are both at least two, and are arranged alternately.

[0063] The expansion sections 30a3 and the contraction sections 30a4 are arranged alternately, that is, in the extension direction of the liquid flow channel 30a, the expansion sections 30a3 are arranged upstream and / or downstream of the contraction sections 30a4. The cross-sectional size and shape of each expansion section 30a3 can be set to be the same. Of course, the cross-sectional size and shape of each expansion section 30a3 can also be set to be different. Similarly, the cross-sectional size and shape of each contraction section 30a4 can be set to be the same. Of course, the cross-sectional size and shape of each contraction section 30a4 can also be set to be different.

[0064] In the embodiment, the number of the expansion sections 30a3 and the number of the contraction sections 30a4 are both set to be at least two, and are arranged alternately, so that the liquid flowing through the liquid flow channel can alternately pass through the expansion sections 30a3 and the contraction sections 30a4, further improving the change effect of the flow rate and pressure distribution of the liquid flowing through, to better induce the liquid to form turbulent flow.

[0065] Please refer to Figure 4 and Figure 5 In an embodiment of the present application, among the at least two contraction sections 30a4, the contraction section 30a4 having the flow channel outlet 30a2 is defined as a terminal contraction section 30a41; among the at least two expansion sections 30a3, the expansion section 30a3 in communication with the terminal contraction section 30a41 is defined as a terminal expansion section 30a31, and the rest are front expansion sections 30a34, the maximum cross-sectional area of the terminal expansion section 30a31 is greater than the maximum cross-sectional area of the front expansion section 30a34.

[0066] The terminal contraction section 30a41 is located at the tail end of the turbulent flow assembly 30 in the liquid flowing direction of the liquid flow channel 30a. The number of the front expansion sections 30a34 can be one, of course, it can also be two or more. When the cross section of the expansion section 30a3 changes in the liquid flowing direction of the liquid flow channel 30a, the cross section at the maximum cross-sectional area is the maximum cross section of the expansion section 30a3. When the cross section of the expansion section 30a3 is equal everywhere in the liquid flowing direction of the liquid flow channel 30a, the cross section at any place is the maximum cross section of the expansion section 30a3. In addition, the cross-sectional size and shape of each front expansion section 30a34 can be set to be the same. Of course, the cross-sectional size and shape of each front expansion section 30a34 can also be set to be different.

[0067] In the embodiment, the maximum cross-sectional area of the end expansion section 30a31 is set to be larger than that of the front expansion section 30a34, so that the end expansion section 30a31 can also play a role of buffering the incoming liquid, and further increase the cross-sectional size change of the end expansion section 30a31 and the contraction section 30a4 to enhance the turbulence intensity and flow rate of the liquid, thereby further improving the disturbance effect on the liquid in the accommodation cavity 10a that has not been filtered and enhancing the lifting effect of the particulate impurities mixed in the liquid.

[0068] 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, and the following relationship is satisfied: 1.1≤S2 / S1≤1.5.

[0069] In the embodiment, 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 is set to be 1.1 to 1.5, so that the maximum cross-sectional area of the end expansion section 30a31 will not be too small to 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 liquid flowing therethrough and affecting the turbulence effect formed. At the same time, the maximum cross-sectional area of the end expansion section 30a31 will not be too large to cause the flow rate and energy of the liquid to drop too much and affect the turbulence effect formed. Therefore, setting the ratio range of S2 and S1 in this way can improve the turbulence effect of the liquid flowing through the liquid flow channel 30a. The ratio of S2 and S1 can be 1.1, 1.2, 1.3, 1.4 or 1.5, and of course can also be any value in the above range.

[0070] Please refer to Figure 4 and Figure 5 In an embodiment of the present application, in the extension direction of the liquid flow channel 30a, the cross-sectional area of the front expansion section 30a34 at both ends is smaller than the cross-sectional area in the middle.

[0071] The cross-sectional area of the front expansion section 30a34 at both ends is smaller than the cross-sectional area in the middle, that is, in the extension 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. The front expansion section 30a34 can include two oppositely arranged first conical ring walls 30a35 to form the cross-sectional area of the front expansion section 30a34 to increase first and then decrease, as described below. Of course, the front expansion section 30a34 can also be set as a spherical cavity to form the cross-sectional area of the front expansion section 30a34 to increase first and then decrease.

[0072] In the embodiment, the cross-sectional area of the front expansion section 30a34 at both ends is 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 guide the inflowing liquid, and then converge and guide the liquid into the contraction section 30a4, thereby improving the smoothness of the liquid flow and improving the stability of the formed turbulent flow. At the same time, the cross-sectional area of the front expansion section 30a34 is set to change in the liquid passing direction of the liquid passing channel 30a, so that the velocity and pressure distribution of the flowing liquid can be changed, thereby facilitating the induction and formation of turbulent flow.

[0073] 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 of one first conical ring wall 30a35 is connected to the end with a larger cross-sectional area of the other first conical ring wall 30a35.

[0074] The conical ring wall, that is, the annular wall surface in the shape of a cone, has an opening at one end that is larger than an opening at the other end in the extension direction of the liquid passing channel 30a. Therefore, the end with a larger cross-sectional area of one first conical ring wall 30a35 is connected to the end with a larger cross-sectional area of the other first conical ring wall 30a35, that is, the end with a larger opening of one first conical ring wall 30a35 is connected to the end with a larger opening of the other first conical ring wall 30a35.

[0075] In the embodiment, the front expansion section 30a34 includes two opposite first conical ring walls 30a35, which can improve the regularity of the front expansion section 30a34 on the basis of satisfying that the cross-sectional area of the front expansion section 30a34 at both ends is smaller than the cross-sectional area in the middle, thereby facilitating the convenience of processing and forming the front expansion section 30a34.

[0076] Please refer to Figure 4 and Figure 5 In an embodiment of the present application, in the extension direction of the liquid passing channel 30a, the cross-sectional area of the end expansion section 30a31 at both ends is smaller than the cross-sectional area in the middle.

[0077] The cross-sectional area of the end expansion section 30a31 at both ends is smaller than the cross-sectional area in the middle, that is, in the extension direction of the liquid passage 30a, the cross-sectional area of the end expansion section 30a31 is set to first increase and then decrease. The end expansion section 30a31 can include a spherical ring wall 30a32 and a second conical ring wall 30a33 to form the cross-sectional area of the end expansion section 30a31 to first increase and then decrease. Of course, the front expansion section 30a34 can also include two opposite second conical ring walls 30a33 to form the cross-sectional area of the end expansion section 30a31 to first increase and then decrease.

[0078] In this embodiment, the cross-sectional area of the end expansion section 30a31 at both ends is set to be relatively small, and the cross-sectional area in the middle is set to be relatively large, so that the end expansion section 30a31 can better guide the incoming liquid, and then converge and guide into the contraction section 30a4, thereby improving the smoothness of the liquid flow and improving the stability of the formed turbulent flow. At the same time, such a setting also makes the cross-sectional area of the end expansion section 30a31 change in the liquid passing direction of the liquid passage 30a, so that the velocity and pressure distribution of the liquid flowing through can be changed, thereby facilitating the enhancement of the induction formation effect of the turbulent flow.

[0079] Please refer to Figure 5 In an embodiment of the present application, the end 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 end with a larger cross-sectional area of the second conical ring wall 30a33 is connected to the end of the spherical ring wall 30a32 close to the outlet 30a2 of the passage.

[0080] The spherical ring wall 30a32 is a ring wall surface in a spherical shape.

[0081] In this embodiment, the end expansion section 30a31 is set to include a spherical ring wall 30a32 and a second conical ring wall 30a33, which can facilitate the enlargement of the cross-sectional area of the end expansion section 30a31 on the basis of satisfying the condition that the cross-sectional area of the end expansion section 30a31 at both ends is smaller than the cross-sectional area in the middle, so as to realize the maximum cross-sectional area of the end expansion section 30a31 being larger than the maximum cross-sectional area of the front expansion section 30a34 as introduced above. At the same time, the regularity of the end expansion section 30a31 can be improved, thereby facilitating the convenience of processing and forming the end expansion section 30a31.

[0082] Please refer to Figure 4 and Figure 5In an embodiment of the present application, in the at least two converging sections 30a4, the converging sections 30a4 other than the end converging section 30a41 are defined as front converging sections 30a43, and the maximum cross-sectional area of the end converging section 30a41 is smaller than that of the front converging section 30a43.

[0083] The number of the front converging sections 30a43 can be one, and can also be at least two. In the case where the cross sections of the converging sections 30a4 are arranged in a changing manner in the liquid flow direction of the liquid flow passage 30a, the cross section at the position of the maximum cross-sectional area is the maximum cross section of the converging section 30a4. In the case where the cross sections of the converging sections 30a4 are arranged in an equal manner in the liquid flow direction of the liquid flow passage 30a, the cross section at any position is the maximum cross section of the converging section 30a4. In addition, the cross-sectional size and shape of each front converging section 30a43 can be arranged to be the same. Of course, the cross-sectional size and shape of each front converging section 30a43 can also be arranged to be different.

[0084] In the present embodiment, the maximum cross-sectional area of the end converging section 30a41 is arranged to be smaller than that of the front converging section 30a43, so that the flow velocity and pressure of the liquid flowing through the end converging section 30a41 can be further increased, so that the disturbance intensity and range of the liquid in the accommodation cavity 10a that has not been filtered after flowing out of the turbulent flow assembly 30 can be enhanced, and the lifting effect of the particulate impurities mixed in the liquid can be enhanced.

[0085] In an embodiment of the present application, the maximum cross-sectional area of the front converging section 30a43 is defined as S3, and the maximum cross-sectional area of the end converging section 30a41 is defined as S4, and the following relationship is satisfied: 0.1≤S4 / S3≤0.9.

[0086] In the present embodiment, the ratio of the maximum cross-sectional area S4 of the end converging section 30a41 to the maximum cross-sectional area S3 of the front converging section 30a43 is arranged to be 0.1 to 0.9, so that the maximum cross-sectional area of the end converging section 30a41 will not be too small to affect the flow rate of the liquid flowing out of the turbulent flow assembly 30 and affect the disturbance range of the turbulent flow. At the same time, the maximum cross-sectional area of the end converging section 30a41 will not be too large to affect the flow rate of the liquid flowing out of the turbulent flow assembly 30 and affect the disturbance intensity of the turbulent flow. Therefore, the ratio of S4 to S3 arranged in this way can better balance the disturbance range and intensity of the turbulent flow of the turbulent flow assembly 30 to the liquid in the accommodation cavity 10a that has not been filtered. 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, and of course can also be any value within the above range.

[0087] 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, and the following relationship is satisfied: 1.1≤S1 / S3≤1.8.

[0088] In the present embodiment, the maximum cross-sectional area S1 of the front expansion section 30a34 and the maximum cross-sectional area S3 of the front contraction section 30a43 are set to be in the range of 1.1 to 1.8, so that the maximum cross-sectional area of the front expansion section 30a34 is not too small to affect the cross-sectional variation effect of the flow channel 30a at the expansion section 30a3 and the contraction section 30a4, and thus weaken the change effect on the flow rate and pressure distribution of the liquid flowing therethrough, and affect the effect of the turbulent flow formed. At the same time, the maximum cross-sectional area of the front expansion section 30a34 is not too large to cause the flow rate and energy of the liquid to decrease too much, and affect the effect of the turbulent flow formed. Therefore, by setting the ratio of S1 to S3 in the above range, the effect of the turbulent flow formed by the liquid flowing through the flow channel 30a can be improved. 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 can be any value in the above range.

[0089] For reference Figure 4 and Figure 5 In an embodiment of the present application, in the same contraction section 30a4, the cross-sectional areas at different positions of the contraction section 30a4 in the extension direction of the flow channel 30a are equal.

[0090] In the present embodiment, the cross-sectional areas at different positions of the contraction section 30a4 are set to be equal, so that the contraction section 30a4 can uniformly and effectively compress the liquid flowing therethrough at different positions, so that the liquid flowing through the contraction section 30a4 can form a flow with a required flow rate and pressure, and promote the formation of turbulent flow. At the same time, by setting in this way, the structure of the contraction section 30a4 is regular, and thus the convenience of processing and forming the contraction section 30a4 is improved.

[0091] For reference Figure 4 and Figure 5 In an embodiment of the present application, in the extension direction of the flow channel 30a, the extension size of the contraction section 30a4 is greater than the extension size of the expansion section 30a3.

[0092] In the present embodiment, the extension size of the contraction section 30a4 is set to be greater than the extension size of the expansion section 30a3, which is beneficial to prolong the time of the liquid flowing through the contraction section 30a4, so that the liquid is sufficiently contracted, the speed and pressure of the liquid flowing therethrough are increased, the variation of the speed and pressure of the liquid in the flow channel 30a is increased, and the formation of turbulent flow is promoted.

[0093] For reference Figure 5In an embodiment of the present application, in the extension direction of the liquid-passing flow channel 30a, the extension size of the contraction section 30a4 is defined as L1, and the extension size of the expansion section 30a3 is defined as L2, and the following relationship is satisfied: 0.6≤L2 / L1≤0.8.

[0094] The extension size of the contraction section 30a4 is L1, including the extension size of the front contraction section 30a43 being L1, and also including the extension size of the terminal contraction section 30a41 being L1. The extension size of the expansion section 30a3 is L2, including the extension size of the front expansion section 30a34 being L2, and also including the extension size of the terminal expansion section 30a31 being L2.

[0095] In the present embodiment, the ratio of L2 to L1 is set to be 0.6 to 0.8, so that the extension size of the contraction section 30a4 will not be too short to affect the contraction effect on the liquid flowing therethrough. At the same time, the extension size of the contraction section 30a4 will not be too large to affect the frequency of expansion and contraction of the liquid and affect the turbulent flow effect. The ratio of L2 to L1 can be 0.6, 0.7 or 0.8, and of course can be any value within the above range.

[0096] Please refer to Figures 3 to 5 In an embodiment of the present application, the liquid-passing 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 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.

[0097] The buffer section 30a5 can be used to buffer the inflowing liquid. In the liquid-passing direction of the liquid-passing flow channel 30a, the cross-sectional area of the buffer section 30a5 can be set to vary, and of course can be set to be equal. Moreover, in the projection plane perpendicular to the liquid-passing direction of the liquid-passing flow channel 30a, the projection of the buffer section 30a5 can be circular, and of course can be square or rectangular, etc. It can be seen that the shape of the buffer section 30a5 is not limited in the present application. When the cross-sectional area of the buffer section 30a5 is set to vary, 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 area of the buffer section 30a5 is set to be equal at all places in the liquid-passing direction of the liquid-passing flow channel 30a, the cross section at any place is the maximum cross section of the buffer section 30a5, and can also be said to be the minimum cross section. In addition, the buffer section 30a5 can be in communication with the contraction section 30a4 as described below, or can be in communication with the expansion section 30a3.

[0098] In the embodiment, the liquid flow channel 30a further comprises a buffer section 30a5 upstream of the converging section 30a4, so that the liquid can be buffered through the buffer section 30a5 to have sufficient amount of liquid to enter the subsequent diverging section 30a3 and the converging section 30a4 to achieve effective expansion and contraction of the liquid.

[0099] Please refer to Figure 4 and Figure 5 In an embodiment of the present application, the buffer section 30a5 is in communication with a converging section 30a4 at an end away from the flow channel inlet 30a1.

[0100] In the embodiment, the buffer section 30a5 is in communication with the converging section 30a4, so that the buffered liquid can directly enter the converging section 30a4 for contraction. The cross-sectional area of the buffer section 30a5 and the converging section 30a4 changes greatly, which is conducive to improving the contraction effect of the liquid to promote the formation of turbulent flow. At the same time, the liquid can obtain sufficient flow rate and pressure after passing through the converging section 30a4 in communication with the buffer section 30a5, thereby obtaining sufficient energy to stably complete the flow of the subsequent part of the liquid flow channel 30a to meet the required flow rate and pressure, and improve the stability of the formed turbulent flow.

[0101] Please refer to Figure 4 and Figure 5 In an embodiment of the present application, the buffer section 30a5 comprises at least two sub-cavities 30a51 in communication in sequence, and the maximum cross-sectional area of the at least two sub-cavities 30a51 decreases in the direction from the flow channel inlet 30a1 to the flow channel outlet 30a2.

[0102] In the embodiment, the buffer section 30a5 is provided with at least two sub-cavities 30a51, and the maximum cross-sectional area of the at least two sub-cavities 30a51 decreases 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 into the liquid inlet hole 11a with relatively large cross-sectional area and guide the liquid to the converging section 30a4 with relatively small cross-sectional area.

[0103] Please refer to Figure 4 and Figure 5 In an embodiment of the present application, the buffer section 30a5 comprises three sub-cavities 30a51, and the three sub-cavities 30a51 are defined as a first sub-cavity 30a52, a second sub-cavity 30a53 and a third sub-cavity 30a54; the first sub-cavity 30a52 and the third sub-cavity 30a54 are cylindrical cavities, and the second sub-cavity 30a53 is a spherical cavity.

[0104] In the embodiment, the buffer section 30a5 is provided with the first sub-cavity 30a52 and the third sub-cavity 30a54 in the form of cylindrical cavities at two ends, and the second sub-cavity 30a53 in the form of a spherical cavity in the middle, so that the buffer section 30a5 can be conveniently connected with the liquid inlet hole 11a and the contraction section 30a4. The second sub-cavity 30a53 in the form of a spherical cavity can guide the liquid.

[0105] Please refer to Figure 3 In an embodiment of the present application, the cross section of the liquid passing flow channel 30a is circular in the cross section perpendicular to the extending direction of the liquid passing flow channel 30a.

[0106] In the embodiment, the cross section of the liquid passing flow channel 30a is circular, which can make the structure of the liquid passing flow channel 30a more regular and simple, and thus facilitate the convenience of processing and forming. On the other hand, it can also reduce the resistance of the liquid when flowing through the liquid passing flow channel 30a, and improve the smoothness of the liquid flowing in the turbulent flow assembly 30.

[0107] Please refer to 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 machine body 10, and the turbulent flow assembly 30 and the filter core assembly 20 are both arranged along the first direction, and the liquid passing flow channel 30a is arranged along the extending direction of the turbulent flow assembly 30.

[0108] When the first direction is the up-down direction, the liquid inlet hole 11a and the liquid outlet hole 11b can be arranged at the lower end of the machine body 10. When the machine body 10 includes the base 11 and the cylinder 13 as described above, the liquid inlet hole 11a and the liquid outlet hole 11b can be arranged on the base 11 of the machine body 10.

[0109] In the embodiment, the turbulent flow assembly 30 and the filter core assembly 20 are both arranged along the first direction and connected to the same end of the machine body 10, and the liquid passing flow channel 30a is arranged along the extending direction of the turbulent flow assembly 30, so that after the liquid passing through the liquid passing flow channel 30a to form a turbulent flow and flowing out of the flow outlet 30a2, the liquid can flow towards the end away from the liquid inlet hole 11a and the liquid outlet hole 11b, so as to make the particles mixed in the liquid flow towards the end away from the liquid inlet hole 11a and the liquid outlet hole 11b, and realize that the particles are intercepted along with the liquid flowing into the end of the filter core assembly 20 away from the liquid outlet hole 11b. That is, when the first direction is the up-down direction, the particles can be lifted upwards as much as possible to enter the upper part of the filter core assembly 20 to be intercepted and filtered, and the utilization rate of the upper part of the filter core assembly 20 is improved.

[0110] Please refer to Figure 1 and Figure 8In an embodiment of the present application, in the first direction, the accommodating cavity 10a comprises a first cavity wall 10a1 and a second cavity wall 10a2 oppositely spaced, the liquid inlet hole 11a and the liquid outlet hole 11b are arranged on the first cavity wall 10a1; the distance between the end of the filter element assembly 20 away from the first cavity wall 10a1 and the first cavity wall 10a1 is defined as L3, the distance between the end of the turbulent flow assembly 30 away from the first cavity wall 10a1 and the first cavity wall 10a1 is defined as L4, and the relationship 0.3≤L4 / L3≤0.6 is satisfied.

[0111] When the first direction is the up-down direction, the first cavity wall 10a1 and the second cavity wall 10a2 can be the lower cavity wall and the upper cavity wall of the accommodating cavity 10a respectively. Moreover, when the machine body 10 comprises 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 arranged on the base 11 of the machine 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 turbulent flow assembly 30 and the upper surface of the base 11.

[0112] In the embodiment, by setting the ratio of L4 to L3 to be 0.3 to 0.6, the extension size of the turbulent flow assembly 30 in the first direction can be prevented from being too small to limit the lifting height of the particles and affect the utilization of the upper part of the filter element assembly 20. At the same time, the extension size of the turbulent flow assembly 30 in the first direction can be prevented from being too large to cause the lifting height of the particles to be too high, so that the particles are located between the second cavity wall 10a2 and the upper end of the filter element assembly 20 and cannot be effectively filtered. Therefore, by setting the ratio range of L4 to L3 in this way, the utilization of the upper part of the filter element assembly 20 and the filtering effect of the particles can be better balanced. The ratio of L4 to L3 can be 0.3, 0.4, 0.5 or 0.6, and of course can also be any value in the above range.

[0113] For reference Figure 1 In an embodiment of the present application, the number of liquid inlet holes 11a is two, and they are located on the opposite sides of the liquid outlet hole 11b in the second direction intersecting the first direction; the number of turbulent flow assemblies 30 is two, and each turbulent flow assembly 30 corresponds to one liquid inlet hole 11a.

[0114] In the embodiment, the number of the turbulent flow assemblies 30 is set to two and located on opposite sides of the filter element assembly 20 in the second direction, so that the turbulent flow can be formed by the two turbulent flow assemblies 30 to disturb the liquid on the opposite sides of the filter element assembly 20. Meanwhile, the number of the turbulent flow assemblies 30 is not too much, so that the turbulent flow formed does not excessively disturb the liquid in the accommodating cavity 10a, and the particulate impurities cannot enter the filter element assembly 20 for effective filtration by repeatedly fluctuating.

[0115] For reference Figures 1 to 3 In an embodiment of the present application, the first protrusion 311 is arranged on the side circumferential surface of the turbulent flow assembly 30 around the liquid flow channel 30a.

[0116] The first protrusion 311 can be a seat structure, a block structure, or a plate structure or a column structure, and the shape of the first protrusion 311 is not limited in the present application. In addition, the number of the first protrusion 311 can be one, of course, two or more. Moreover, when the number of the first protrusion 311 is at least two, the at least two first protrusions 311 can be arranged only around the turbulent flow assembly 30. Of course, when the at least two first protrusions 311 arranged only around the turbulent flow assembly 30 are defined as a group, the turbulent flow assembly 30 can also be provided with at least two groups of first protrusions 311 along the extension direction of the liquid flow channel 30a.

[0117] In the embodiment, by arranging the first protrusion 311, the liquid flowing through the first protrusion 311 can form an auxiliary turbulent flow to further improve the lifting effect of the particulates mixed in the liquid.

[0118] For reference Figure 4 and Figure 5 In an embodiment of the present application, in the extension direction of the liquid flow channel 30a, the opposite sides of the first protrusion 311 are respectively provided with a first guide surface 3111 and a second guide surface 3113; and in the direction from the end of the first protrusion 311 away from the turbulent flow assembly 30 to the end close to the turbulent flow assembly 30, the distance between the first guide surface 3111 and the second guide surface 3113 decreases.

[0119] When the first direction is the up-down direction, the lower surface of the first protrusion 311 can form the first guide surface 3111, and the upper surface can form the second guide surface 3113. In addition, the first guide surface 3111 can be an inclined surface, of course, an arc surface. Similarly, the second guide surface 3113 can be an inclined surface, of course, an arc surface.

[0120] In the embodiment, the first convex part 311 is provided with a first guide surface 3111 and a second guide surface 3113 on both sides in the extension direction of the liquid flow channel 30a, so that the liquid can be guided by the first guide surface 3111 and the second guide surface 3113, thereby facilitating the smooth flow of the liquid.

[0121] For reference Figure 3 In an embodiment of the present application, the number of the first convex part 311 is at least two, and the first convex part 311 is arranged around the turbulent flow component 30.

[0122] In the embodiment, the number of the first convex part 311 is at least two, and the first convex part 311 is arranged around the turbulent flow component 30, so as to facilitate the formation of auxiliary turbulence in the circumferential direction of the turbulent flow component 30, thereby improving the lifting effect of the particles mixed in the liquid.

[0123] For reference Figures 3 to 5 In an embodiment of the present application, the first convex part 311 can be arranged at the middle position of the turbulent flow component 30, so that the high-frequency turbulence formed by the liquid flow channel 30a can lift the particles above the turbulent flow component 30 after flowing out of the turbulent flow component 30, and the auxiliary turbulence formed by the first convex part 311 can lift the particles in the horizontal direction corresponding to the turbulent flow component 30, so that the high-frequency turbulence and the auxiliary turbulence can lift the particles in different regions, thereby improving the utilization effect of the high-frequency turbulence and the auxiliary turbulence.

[0124] For reference Figure 1 and Figure 6 In an embodiment of the present application, the outlet passage 25a of the filter element assembly 20 is in communication with the outlet hole 11b, and the second convex part 2111 is arranged around the side circumferential surface of the outlet passage 25a of the filter element assembly 20.

[0125] The second convex part 2111 can be a seat structure, a block structure, or a plate structure or a column structure, and the shape of the second convex part 2111 is not limited in the present application. In addition, the number of the second convex part 2111 can be one, or two or more. Moreover, when the number of the second convex part 2111 is at least two, the at least two second convex parts 2111 can be arranged only around the filter element assembly 20. Of course, when the at least two second convex parts 2111 are defined as a group arranged only around the turbulent flow component 30, the filter element assembly 20 can also be provided with at least two groups of second convex parts 2111 arranged along the extension direction of the outlet passage 25a. In addition, the second convex part 2111 can be arranged on the shell 21 of the filter element assembly 20.

[0126] In the embodiment, the second protrusion 2111 is arranged on the shell 21 of the filter element assembly 20, so that the second protrusion 2111 can provide a mechanical interception barrier for the particulate impurities, and a part of the particulate impurities are first mechanically intercepted on the second protrusion 2111. At this time, the second protrusion 2111 outside the filter element assembly 20 and the filter element 23 inside the filter element assembly 20 can form double protection, and the filtering effect on the particulate impurities is improved.

[0127] For reference Figure 1 In an embodiment of the present application, the turbulent flow assembly 30 and the filter element assembly 20 are arranged in the first direction and are arranged side by side and spaced apart in the 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 protrusion 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 turbulent flow assembly 30 away from the liquid inlet hole 11a.

[0128] When the first direction is the up-down direction, it can also be said that the height position of the second protrusion 2111 outside the filter element assembly 20 is higher than the turbulent flow assembly 30.

[0129] In the embodiment, the second protrusion 2111 is arranged to be higher than the turbulent flow assembly 30, so that the second protrusion 2111 can be staggered with the turbulent flow assembly 30, and the compactness between the turbulent flow assembly 30 and the filter element assembly 20 is improved, so that the turbulent flow formed by the turbulent flow assembly 30 facilitates the particulate to enter the upper part of the filter element assembly 20 after the particulate is lifted, and the effective filtering is realized. At the same time, the compact distribution between the turbulent flow assembly 30 and the filter element assembly 20 can reduce the excessive occupation of the space in the accommodation cavity 10a.

[0130] For reference Figure 1 and Figure 6 In an embodiment of the present application, the second protrusion 2111 is provided with a third guide surface 2113, and the third guide 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 of the filter element assembly 20 away from the liquid outlet hole 11b, the distance between the third guide surface 2113 and the end of the filter element assembly 20 close to the liquid outlet hole 11b is arranged to increase.

[0131] When the first direction is the up-down direction, the lower surface of the second protrusion 2111 can form the third guide surface 2113. The third guide surface 2113 can be a bevel, and of course can also be an arc surface.

[0132] In the embodiment, the lower surface of the second protrusion 2111 is arranged as the third guide surface 2113, so that when the liquid flows upwards after entering the accommodation cavity 10a, the third guide surface 2113 can guide the flow of the liquid, and the smoothness of the liquid flow is improved.

[0133] Please refer to Figure 6 In an embodiment of the present application, the number of the second protrusions 2111 is at least two, and the second protrusions 2111 are arranged around the filter core assembly 20.

[0134] In the embodiment, the number of the second protrusions 2111 is set to at least two, and the second protrusions 2111 are arranged around the filter core assembly 20, so that the second protrusions 2111 can play a role in intercepting particulate impurities in the circumferential direction of the filter core assembly 20, further improving the filtering effect on particulate impurities.

[0135] Please refer to Figure 6 In an embodiment of the present application, in order to take into account the role of the second protrusions 2111 in intercepting particulate impurities and the effective entry of liquid into the filter core assembly 20 for filtering, when the at least two second protrusions 2111 are arranged as a group only around the turbulent flow assembly 30, the filter core assembly 20 can be provided with two groups of second protrusions 2111 in the extension direction of the liquid outlet channel 25a.

[0136] Please refer to Figure 1 , Figure 2 and Figures 6 to 8 In an embodiment of the present application, the body 10 is provided with a first insertion hole 11c, one end of the first insertion hole 11c is in communication with the accommodation cavity 10a, and the other end is in communication with the liquid outlet hole 11b; the shell 21 of the filter core assembly 20 can include a first main body 211 and a first insertion column 213 protruding from one end of the first main body 211, and the first insertion column 213 can be inserted into the first insertion hole 11c.

[0137] When the body 10 includes the base 11 and the cylinder 13 as described above, the first insertion hole 11c can be arranged on the base 11. Among them, the shape of the first insertion hole 11c can be matched with the shape of the first insertion column 213, for example: both are arranged as a circle. In addition, the first insertion column 213 and the first insertion hole 11c can be threadedly connected, of course, they can also be connected by interference fit.

[0138] In the embodiment, the filter core assembly 20 and the body 10 are arranged to be inserted and matched by the first insertion column 213 and the first insertion hole 11c, which can make the installation of the filter core assembly 20 and the body 10 more simple, and at the same time can increase the contact area between the two to improve the stability of the connection.

[0139] Please refer to Figure 2 and Figure 6 In an embodiment of the present application, a first sealing ring 40 can be arranged between the first insertion column 213 and the wall of the first insertion hole 11c to seal the connection between the filter core assembly 20 and the body 10.

[0140] Please refer to Figure 1、 Figure 2 and Figures 3 to 5 In an embodiment of the present application, the body 10 is provided with a second insertion hole 11d, one end of which is in communication with the accommodating cavity 10a and the other end of which is in communication with the liquid inlet hole 11a; the turbulent flow assembly 30 can include a second body 31 and a second insertion column 33 protruding from one end of the second body 31, the second insertion column 33 being insertable into the second insertion hole 11d; part of the liquid passage 30a is arranged on the second insertion column 33 and the other part is arranged on the second body 31.

[0141] When the body 10 includes the base 11 and the cylinder 13 as described above, the second insertion hole 11d can be arranged on the base 11. The shape of the second insertion hole 11d can be adapted to the shape of the second insertion column 33, for example, both of them are circular. In addition, the second insertion column 33 and the second insertion hole 11d can be threadedly connected, of course, they can also be connected by interference fit.

[0142] In the present embodiment, the turbulent flow assembly 30 and the body 10 are arranged to be inserted and matched by the second insertion column 33 and the second insertion hole 11d, which can make the installation of the turbulent flow assembly 30 and the body 10 relatively simple, and at the same time, can increase the contact area between them to improve the stability of the connection.

[0143] Please refer to Figure 2 and Figure 5 In an embodiment of the present application, a second sealing ring 50 can be arranged between the second insertion column 33 and the hole wall of the second insertion hole 11d to seal the connection between the turbulent flow assembly 30 and the body 10.

[0144] Please refer to Figure 1 and Figure 2 In an embodiment of the present application, the filter device 100 can further include a liquid inlet pipe 60 and a liquid outlet pipe 70, the liquid inlet pipe 60 being in communication with the liquid inlet hole 11a and the liquid outlet pipe 70 being in communication with the liquid outlet hole 11b, so as to facilitate the connection with the external pipeline through the liquid inlet pipe 60 and the liquid outlet pipe 70.

[0145] Please refer to Figures 1 to 8In an embodiment of the present application, the filtering device 100 comprises a body 10, a filter element assembly 20 and a turbulent flow 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 being in communication with the receiving cavity 10a; the filter element assembly 20 is arranged in the receiving cavity 10a and in communication with the liquid outlet hole 11b; the turbulent flow assembly 30 is arranged in the receiving cavity 10a, and the turbulent flow assembly 30 is provided with a liquid flow channel 30a, the liquid flow channel 30a having a flow channel inlet 30a1 and a flow channel outlet 30a2, the flow channel inlet 30a1 being in communication with the liquid inlet hole 11a, and the flow channel outlet 30a2 being in communication with the receiving cavity 10a. The liquid flow channel 30a comprises an expansion section 30a3 and a contraction section 30a4, the cross-sectional area of the expansion section 30a3 being greater than that of the contraction section 30a4, and the contraction section 30a4 having the flow channel outlet 30a2. The number of 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 flow channel outlet 30a2 is defined as a terminal contraction section 30a41; among the at least two expansion sections 30a3, the expansion section 30a3 in communication with the terminal contraction section 30a41 is defined as a terminal expansion section 30a31, and the rest are defined as front expansion sections 30a34, the maximum cross-sectional area of the terminal expansion section 30a31 being greater than that of the front expansion section 30a34. The maximum cross-sectional area of the front expansion section 30a34 is defined as S1, and the maximum cross-sectional area of the terminal expansion section 30a31 is defined as S2, satisfying the relationship: 1.1≤S2 / S1≤1.5. In the extension direction of the liquid flow channel 30a, the cross-sectional area of the front expansion section 30a34 at both ends is smaller than that in the middle, and / or the cross-sectional area of the terminal expansion section 30a31 at both ends is smaller than that in the middle. In the case that the cross-sectional area of the front expansion section 30a34 at both ends is smaller than that in the middle, the front expansion section 30a34 comprises two first conical ring walls 30a35, one end of the first conical ring wall 30a35 with a larger cross-sectional area being connected to the other first conical ring wall 30a35 with a larger cross-sectional area; in the case that the cross-sectional area of the terminal expansion section 30a31 at both ends is smaller than that in the middle, the terminal expansion section 30a31 comprises a spherical ring wall 30a32 and a second conical ring wall 30a33, the second conical ring wall 30a33 being located on the inner side of the spherical ring wall 30a32, and one end of the second conical ring wall 30a33 with a larger cross-sectional area being connected to one end of the spherical ring wall 30a32 close to the flow channel outlet 30a2. Among the at least two contraction sections 30a4, the contraction sections 30a4 other than the terminal contraction section 30a41 are defined as front contraction sections 30a43, and the maximum cross-sectional area of the terminal contraction section 30a41 is smaller than that of the front contraction section 30a43. The maximum cross-sectional area of the front contraction section 30a43 is defined as S3, and the maximum cross-sectional area of the terminal contraction section 30a41 is defined as S4, satisfying the relationship: 0.1≤S4 / S3≤0.9.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, and the relationship 1.1≤S1 / S3≤1.8 is satisfied. In the extension direction of the liquid passage 30a, the extension size of the contraction section 30a4 is greater than the extension size of the expansion section 30a3. In the extension direction of the liquid passage 30a, the extension size of the contraction section 30a4 is defined as L1, and the extension size of the expansion section 30a3 is defined as L2, and the relationship 0.6≤L2 / L1≤0.8 is satisfied. In the same contraction section 30a4, the cross-sectional area of the contraction section 30a4 is equal in the extension direction of the liquid passage 30a, and the cross section of the liquid passage 30a is circular in the cross section perpendicular to the extension direction of the liquid passage 30a. The liquid passage 30a further comprises a buffer section 30a5, and the buffer section 30a5 has a flow 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. The number of expansion sections 30a3 and contraction sections 30a4 is at least two, and they are arranged alternately. The end of the buffer section 30a5 away from the flow inlet 30a1 communicates with one contraction section 30a4. The buffer section 30a5 comprises at least two sub-cavities 30a51 which are sequentially communicated, and the maximum cross-sectional area of the at least two sub-cavities 30a51 decreases in the direction from the flow inlet 30a1 to the flow outlet 30a2. The buffer section 30a5 comprises three sub-cavities 30a51, which are defined as a first sub-cavity 30a52, a second sub-cavity 30a53 and a third sub-cavity 30a54; 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 assembly 30 and the filter element assembly 20 are arranged in the first direction, and the liquid passage 30a is arranged in the extension direction of the turbulent flow assembly 30. In the first direction, the accommodation cavity 10a comprises a first cavity wall 10a1 and a second cavity wall 10a2 which are arranged in opposite directions, and the liquid inlet hole 11a and the liquid outlet hole 11b are arranged on the first cavity wall 10a1; the distance between the end of the filter element assembly 20 away from the first cavity wall 10a1 and the first cavity wall 10a1 is defined as L3, and the distance between the end of the turbulent flow assembly 30 away from the first cavity wall 10a1 and the first cavity wall 10a1 is defined as L4, and the relationship 0.3≤L4 / L3≤0.6 is satisfied. The number of liquid inlet holes 11a is two, and they are located on the opposite sides of the liquid outlet hole 11b in the second direction, and the second direction intersects the first direction; the number of turbulent flow assemblies 30 is two, and each turbulent flow assembly 30 corresponds to one liquid inlet hole 11a. The first protrusion 311 is arranged on the side surface of the liquid passage 30a.The first protruding part 311 is provided with a first guide surface 3111 and a second guide surface 3113 on opposite sides in the extension direction of the liquid flow channel 30a; the distance between the first guide surface 3111 and the second guide surface 3113 decreases from the end of the first protruding part 311 away from the turbulent flow component 30 to the end close to the turbulent flow component 30; the number of the first protruding part 311 is at least two, and the first protruding part 311 is arranged around the turbulent flow component 30. The filter element assembly 20 is provided with a liquid outlet channel 25a, the liquid outlet channel 25a is in communication with the liquid outlet hole 11b, and the filter element assembly 20 is provided with a second protruding part 2111 around the side circumferential surface of the liquid outlet channel 25a. The turbulent flow component 30 and the filter element assembly 20 are arranged in the first direction and are arranged side by side and spaced apart in the 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 protruding part 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 turbulent flow component 30 away from the liquid inlet hole 11a; the second protruding part 2111 is provided with a third guide surface 2113, and the third guide 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 guide surface 2113 and the end of the filter element assembly 20 close to the liquid outlet hole 11b increases; the number of the second protruding part 2111 is at least two, and the second protruding part 2111 is arranged around the filter element assembly 20.

[0146] The application also provides a liquid injection device, which comprises a liquid injection machine and the filter device 100, and the specific structure of the filter device 100 is referred to the above-mentioned embodiments. Since the liquid injection device adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here. The liquid injection machine can be provided with a liquid inlet, and the liquid outlet hole 11b of the filter device 100 can be in communication 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. Through the filtering effect of the filter device 100 on the electrolyte, the possibility of particles mixed in the electrolyte being injected into the battery device can be reduced, and the possibility of the diaphragm of the battery device being pierced by the particles to cause short circuit can be reduced.

[0147] The above-mentioned is only the preferred embodiment of the application, and does not limit the patent scope of the application, and any equivalent structural transformation made according to the application concept, the contents of the specification and the drawings, or direct / indirect application in other related technical fields is included in the patent protection scope of the application.

Claims

1. A filtering device, characterized in that: include: A body, the body being provided with a receiving cavity, a liquid inlet hole, and a liquid outlet hole, the liquid inlet hole and the liquid outlet hole being connected to the receiving cavity; a filter element assembly, the filter element assembly being disposed in the accommodating cavity and communicating with the liquid outlet; and a turbulent flow component, the turbulent flow component being disposed in the accommodating chamber, the turbulent flow component being provided with a liquid flow channel, the liquid flow channel having a flow channel inlet and a flow channel outlet, the flow channel inlet being in communication with the liquid inlet hole, and the flow channel outlet being in communication with the accommodating chamber; 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 the flow channel outlet; The liquid flow channel further includes a buffer section, and the buffer section has the flow channel inlet; The maximum cross-sectional area of ​​the buffer segment is greater than the maximum cross-sectional area of ​​the expansion segment, and the minimum cross-sectional area of ​​the buffer segment is greater than the maximum cross-sectional area of ​​the contraction segment; There are at least two expansion sections and at least two contraction sections, which are arranged alternately, and one end of the buffer section away from the flow channel inlet is connected to one of the contraction sections; The cache section includes at least two sub-cavities connected in sequence, and in the direction from the flow channel inlet to the flow channel outlet, the maximum cross-sectional areas of the at least two sub-cavities are arranged to decrease.

2. The filtering device according to claim 1, wherein Among the at least two contraction sections, the contraction section having the flow channel outlet is defined as the terminal contraction section; Among the at least two expansion segments, the expansion segment connected to the terminal contraction segment is defined as the terminal expansion segment, and the rest are front expansion segments, and the maximum cross-sectional area of ​​the terminal expansion segment is greater than the maximum cross-sectional area of ​​the front expansion segment.

3. The filtering device according to claim 2, characterized in that The maximum cross-sectional area of ​​the front expansion segment is defined as S1, and the maximum cross-sectional area of ​​the terminal expansion segment is defined as S2, satisfying the relationship: 1.1≤S2 / S1≤1.

5.

4. The filtering device according to claim 2, wherein In the extension direction of the liquid flow channel, the cross-sectional areas at both ends of the front expansion segment are smaller than the cross-sectional area in the middle, and / or the cross-sectional areas at both ends of the terminal expansion segment are smaller than the cross-sectional area in the middle.

5. The filtering device according to claim 4, characterized in that In the case where 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 comprises two first conical annular walls, and an end with a larger cross-sectional area in one of the first conical annular walls is connected to an end with a larger cross-sectional area in the other first conical annular wall; And / or, when the cross-sectional area at both ends of the terminal expansion section is smaller than the cross-sectional area in the middle, the terminal expansion section includes a spherical annular wall and a second conical annular wall, the second conical annular wall is located on the inner side of the spherical annular wall, and the end of the second conical annular wall with a larger cross-sectional area is connected to the end of the spherical annular wall close to the flow channel outlet.

6. The filtering device according to claim 2, wherein Among the at least two contraction sections, the contraction sections except the terminal contraction section are defined as front contraction sections, and the maximum cross-sectional area of ​​the terminal contraction section is smaller than the maximum cross-sectional area of ​​the front contraction section.

7. The filtering device according to claim 6, characterized in that The maximum cross-sectional area of ​​the front contraction section is defined as S3, and the maximum cross-sectional area of ​​the terminal contraction section is defined as S4, satisfying the relationship: 0.1≤S4 / S3≤0.

9.

8. The filtering device according to claim 6, wherein 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.

9. The filtering device according to claim 1, wherein In the extension direction of the liquid flow channel, the extension dimension of the contraction section is greater than the extension dimension of the expansion section.

10. The filtering device according to claim 1, wherein In the extension direction of the liquid flow channel, the extension dimension of the contraction section is defined as L1, and the extension dimension of the expansion section is defined as L2, satisfying the relationship: 0.6≤L2 / L1≤0.

8.

11. The filtering device according to claim 1, wherein In the same contraction section, in the extension direction of the liquid flow channel, the cross-sectional areas of the contraction section are equal at all locations; And / or, in a cross section perpendicular to the extension direction of the liquid flow channel, the cross section of the liquid flow channel is circular.

12. The filtering device according to claim 1, wherein 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.

13. The filtering device according to any one of claims 1 to 12, characterized in that 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 a first direction, and the liquid flow channel is extended along the extension direction of the turbulence component.

14. The filtering device according to claim 13, wherein In the first direction, the accommodating cavity includes a first cavity wall and a second cavity wall that are spaced apart from each other, and the liquid inlet and the liquid outlet are provided on 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.

15. The filtering device according to claim 13, wherein There are two liquid inlet holes, which are located on opposite sides of the liquid outlet hole in a second direction, and the second direction intersects with the first direction; There are two turbulence components, and each turbulence component is provided corresponding to one liquid inlet hole.

16. The filtering device according to any one of claims 1 to 12, characterized in that The turbulence component is provided with a first convex portion on the side surface surrounding the liquid flow channel.

17. The filtering device according to claim 16, wherein In the extension direction of the liquid flow channel, a first guide surface and a second guide surface are respectively provided on opposite sides of the first protrusion; and the distance between the first guide surface and the second guide surface decreases from the end of the first protrusion away from the turbulence component to the end close to the turbulence component. And / or, the number of the first protrusions is at least two, and the first protrusions are arranged around the turbulence component.

18. The filtering device according to any one of claims 1 to 12, characterized in that The filter element assembly is provided with a liquid outlet channel, the liquid outlet channel is communicated with the liquid outlet hole, and the filter element assembly is provided with a second convex portion on the side circumference surrounding the liquid outlet channel.

19. The filtering device according to claim 18, wherein The turbulence assembly and the filter element assembly are both extended along a first direction and spaced side by side in a second direction intersecting the first direction; the distance between an end of the filter element assembly away from the liquid outlet and the second protrusion is smaller than the distance between an end of the filter element assembly away from the liquid outlet and an end of the turbulence assembly away from the liquid inlet; And / or, the second protrusion is provided with a third guide surface, the third guide surface is arranged toward the end of the filter element assembly close to the liquid outlet; in the direction from the end of the filter element assembly close to the liquid outlet to the end away from the liquid outlet, the distance between the third guide surface and the end of the filter element assembly close to the liquid outlet is arranged to increase; And / or, the number of the second protrusions is at least two, and they are arranged around the filter element assembly.

20. A liquid injection device, characterized in that: Comprising the filtering device according to any one of claims 1 to 19.

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